WO2020067658A1 - Artificial leather for automotive interior material and manufacturing method therefor - Google Patents

Abstract

The present invention relates to an artificial leather for an automotive interior material and a manufacturing method therefor and, more specifically, to an artificial leather for an automotive interior material, used in an automotive interior material-covering process, and a manufacturing method therefor, which can prevent transcription of the unevenness of an automotive interior material, prevent creasing of an artificial leather, and allows easy unfolding of an airbag. [Representative drawing] figure 2

Description

Artificial leather for automobile interior materials and manufacturing method thereof

The present invention relates to an artificial leather for automobile interior materials and a method for manufacturing the same, and more particularly, to an artificial leather for automobile interior materials used in an automobile interior material covering process, to prevent irregularities in the transfer of automobile interior materials and to prevent wrinkles in artificial leather. It may be, and the present invention relates to a synthetic leather for a vehicle interior material that is easy to deploy an airbag and a method for manufacturing the same.

Automotive interior materials, such as crash pads, door trims, console boxes, arm rests, head rests, head liners, etc., typically have a skin layer from top to bottom; Foam layer; And a core layer that is a hard synthetic resin injection.

The vehicle interior material may be manufactured in various ways, for example, a skin layer; And forming a skin layer by vacuum forming a sheet for a vehicle interior material including a foam layer formed on the bottom surface of the skin layer, and then mounting the skin layer on a mold to inject a synthetic resin underneath it to form a core layer. Can be produced.

In recent years, a method of manufacturing an automotive interior material through a covering process (aka, a wrapping process), in which a form of an adhesive is applied to the top of the foam layer to wrap up the foam layer and the core layer with natural leather, is used to maximize the luxury of the automobile interior material. However, natural leather is expensive and there is an issue of animal protection, so we are trying to apply artificial leather.

As an example, Republic of Korea Patent Publication No. 10-2018-0078057 (published date: 2018.07.09) discloses a method for manufacturing a vehicle interior using the artificial leather skin layer, as the back layer of the artificial leather Disclosed is the use of a nonwoven fabric.

However, the non-woven fabric as described above is expensive and has to be applied only to a high-end vehicle, and the elongation is not good, so the seam is not neat and workability deteriorates during the covering process. After completing the covering process, wrinkles on the artificial leather as shown in FIG. There was a problem that occurred. In addition, when applying the artificial leather to automobile interior materials such as a crash pad, there was a problem in that it is difficult to prevent the irregularities of the automobile interior material such as unevenness of the automobile interior material is expressed on the artificial leather.

Accordingly, development of artificial leather for automobile interior materials is in desperate need, while preventing uneven transfer of automobile interior materials, being inexpensive, preventing wrinkles, and easily deploying airbags.

〔Advanced technical literature〕

(Patent Document) (Patent Document 1) KR 10-2018-0078057 A (Publication date: 2018.07.09)

The present invention has been devised to solve the above problems, and provides an artificial leather for automobile interior materials and a method for manufacturing the automobile interior materials which are inexpensive, can prevent wrinkles and prevent airbag deployment. There is a purpose.

In order to achieve the above object,

The present invention from the bottom to the top, the back layer; Pore layer; Adhesive layer; And artificial leather for automotive interior materials comprising a skin layer,

The back layer includes a circular knitted fabric,

The artificial leather for automobile interior materials has an elongation of 80-180% in the longitudinal direction and 110-290% in the width direction, the tensile strength is 80kgf / 30mm or less in the longitudinal direction, and 70kgf / 30mm or less in the width direction, covering of automobile interior materials It provides a synthetic leather for automobile interior materials that are intended to be used in the process.

In addition, the present invention

Forming a back layer to impregnate the knitted fabric (S1);

A skin layer forming step (S1 ') of forming a skin layer on the release paper;

A pore layer forming step (S3) of forming a pore layer on the back surface layer;

An adhesive layer forming step (S4) of forming an adhesive layer on the skin layer;

A skin layer laminating step (S5) of laminating a skin layer having an adhesive layer formed on the pore layer; And

A release paper removing step of removing the release paper (S7); As a method of manufacturing artificial leather for automobile interior materials, including,

The knitted fabric is a circular knitted fabric (丸 編 布),

The artificial leather for automobile interior materials has an elongation of 80-180% in the longitudinal direction and 110-290% in the width direction, the tensile strength is 80kgf / 30mm or less in the longitudinal direction, and 70kgf / 30mm or less in the width direction, covering of automobile interior materials It provides a method for manufacturing artificial leather for automobile interior materials that is intended to be used in a process.

The artificial leather for automobile interior materials of the present invention has an effect that it is inexpensive, prevents wrinkles, and facilitates airbag deployment while preventing uneven transfer of automobile interior materials.

In addition, the artificial leather for automobile interior materials of the present invention has an excellent effect on sensitivity and ductility.

1 is a side cross-sectional view schematically showing a laminated structure of an embodiment of an artificial leather for automobile interior material according to the present invention.

Figure 2 is a side cross-sectional view schematically showing a laminated structure of another embodiment of an artificial leather for automobile interior materials according to the present invention.

3 is a side cross-sectional view schematically showing a laminated structure of another embodiment of an artificial leather for automobile interior material according to the present invention.

4 is a flow chart showing a manufacturing method of an embodiment of the artificial leather for automobile interior materials according to the present invention.

5 is a plan view showing a specimen for measuring the elongation and tensile strength of artificial leather.

6 is a photograph showing the exterior of the vehicle interior material after completing the automotive interior material covering process using the artificial leather for interior material of Comparative Example 1.

7 is a photograph showing the exterior of the vehicle interior material after completing the automotive interior material covering process using the artificial leather for interior material according to the present invention.

8 is a SEM (Scanning Electron Microscope) photograph of a vertical cut surface of the artificial leather as a reference for explaining the non-porous and pores in the pore layer of the artificial leather.

The inventors of the present invention, from the end of each effort to manufacture artificial leather for automobile interior materials used in the covering process of automobile interior materials, from bottom to top, the back layer; Pore layer; Adhesive layer; And a skin layer, when using a circular knitted fabric as the backing layer, and adjusting the tensile strength of the artificial leather for automobile interior materials to a specific range or less, the artificial leather for automobile interior materials is inexpensive, but workability during the covering process Excellent, while preventing the uneven transfer of the car interior material after the covering process, it is possible to prevent wrinkles, it was confirmed that it is possible to implement the effect of easy deployment of the airbag to complete the artificial leather for car interior materials of the present invention.

Hereinafter, the artificial leather for automobile interior materials of the present invention will be described in detail with reference to the accompanying drawings.

Here, it should be noted that, in addition to reference numerals for the components of each drawing, the same components are denoted by the same reference numerals as much as possible even though they are displayed on different drawings.

Referring to Figure 1, artificial leather for automobile interior materials of the present invention (1) from the bottom to the top, the back layer (10); Pore layer 20; It includes an adhesive layer 30 and a skin layer 40.

The artificial leather for automobile interior materials of the present invention as described above may be artificial leather for its use in a covering process of automobile interior materials.

In the present invention, an example of the covering process is an epidermal layer; In the automotive interior material composed of the core layer, after applying the adhesive on the core layer, it may be a process of manufacturing the automotive interior material by wrapping the core layer with artificial leather, which is a skin layer.

 As another example, the epidermal layer from top to bottom; Cushion layer; And a core layer. In the automotive interior material consisting of, after applying the adhesive on the top of the core layer, wrap the core layer with a cushion layer, apply the adhesive on the top of the cushion layer, and then wrap the cushion layer and the core layer with artificial leather, which is a skin layer. It may be a process for manufacturing.

The cushion layer may be, for example, one or more foams selected from the group consisting of polypropylene foam, polyurethane foam, and ethylene-vinyl acetate foam.

Alternatively, as another example of the cushion layer, a cushion manufactured using one or more synthetic fibers selected from the group consisting of nylon-based fibers, polyester-based fibers, polyolefin-based fibers, polyethylene terephthalate-based fibers, and polypropylene-based fibers. Can be

The core layer may be a hard synthetic resin injection material, for example, polyamide, polycarbonate, acrylonitrile-butadiene-styrene, styrene-acrylonitrile, polyvinyl chloride, polystyrene, polyphenylene sulfide, polypropylene and polyethylene. It may be one or more synthetic resin injection material selected from the group consisting, but is not limited thereto.

Hereinafter, the laminated structure of the artificial leather for automobile interior material 1 of the present invention as described above will be described in detail.

Back layer (10)

According to the manufacturing method, the fabric is largely divided into a non-woven fabric, a woven fabric, and a circular knit.

The non-woven fabric refers to a shape in which the fiber aggregate is bonded to each other by chemical or mechanical action or by heat treatment with appropriate moisture.

The woven fabric means a fabric formed through a woven process using the yarn after forming the fiber aggregate into a yarn.

The woven fabric is a word commonly used with textiles, and the woven fabric refers to a fabric in which two threads are entangled in the horizontal and vertical directions, and the yarn in the vertical direction, that is, the yarn in the horizontal direction, that is, the weft yarn is intertwined with each other. Refers to the fabric. The woven fabric can be divided into plain weave, twill weave, and runner weave depending on the manufacturing method.

The knitted fabric refers to a fabric woven by continuously looping (loop, loop) with one or two or more threads, and may be divided into circular knitted fabric and light knitted fabric according to the manufacturing method. It has the advantage of good elasticity compared to woven fabric. The circular knitted fabric means a fabric woven by yarn feeding in the weft direction, and the light knitted fabric means a fabric woven by yarn feeding in a warp direction.

The present invention has the effect of providing an artificial leather having excellent elongation and tensile strength while being inexpensive when using the knitted fabric impregnated with the back layer 10.

In the present invention, as a specific example of the fabric for forming the back layer 10, a circular knitted fabric having superior elongation compared to a light knitted fabric may be used among knitted fabrics.

The knitted fabric may be formed using a yarn having a thickness of 120-170 denier or 130-160 denier, and has an excellent strength effect within the above range.

The yarn (絲) means a yarn made by twisting one or more fibers selected from natural fibers, recycled fibers, and synthetic fibers.

The natural fiber may be cotton fiber, hemp fiber, wool fiber, silk fiber or wool fiber, the regenerated fiber may be rayon fiber or cupra fiber, and the synthetic fiber may be polyester fiber, nylon fiber, polyolefin fiber, It may be polyvinyl alcohol fiber, polyamide fiber, polyurethane fiber or polyvinylidene chloride fiber.

In the present invention, a polyester fiber having excellent elongation may be used as a specific example of yarn for forming the back layer 10.

 In addition, the knitted fabric is inexpensive and has a shape-retaining property capable of withstanding repetitive stretching and may be impregnated to impart an elongation suitable for the covering process.

The impregnation may be to perform coagulation and water washing in water in a dimethylformamide aqueous solution after impregnation with an impregnation solution containing a conventionally known solvent-based or water-based polymer compound, for example, a polyurethane resin or a copolymer thereof. .

The impregnating solution may be a polyurethane solution containing 200-400 parts by weight of a solvent or 220-290 parts by weight based on 100 parts by weight of a polyurethane resin.

The solvent may be one or more selected from the group consisting of dimethylformamide, methylethylketone, dimethylacetamide, N-methylpyrrolidone, dimethylsulfoxide and ethyl acetate.

In addition, the impregnating solution may, optionally, further include other additives such as flame retardants, dispersants or pigments, and the type and content thereof are not limited.

The dimethylformamide aqueous solution may include, for example, 2-10% by weight or 3-8% by weight of dimethylformamide and 90-98% by weight or 92-97% by weight of water.

When using the knitted fabric impregnated with the polyurethane solution, the back layer 10 of the present invention prevents deterioration in quality by artificial leather to withstand repeated stretching and elongation and airbags suitable for sensitivity and covering processes such as soft feel and filling. It is suitable for deployment and can maintain excellent tensile strength.

In addition, the back layer 10 of the present invention can optionally use a knitted fabric with brushed on one or both sides, and in this case, it has an excellent adhesiveness and sensitivity.

More specifically, the back surface layer 10 may be impregnated with a knitted fabric on which at least one selected from among a surface which is a part in contact with the pore layer 20 to be described later and a back surface in contact with the cushion layer by a covering process is formed. have.

In addition, in one embodiment, when the artificial leather for automobile interior material 1 of the present invention has a seam line, the back layer 10 has a thickness of 0.5-1.0mm, 0.55-0.9mm, or 0.6- It may be 0.7 mm. It is possible to have a thickness within the above range while preventing the increase in cost while preventing deterioration of mechanical properties such as tensile strength within the above range.

In the present invention, the seam line means a tear line for allowing the artificial leather to rupture into a certain shape (eg, H shape, I shape, or V shape) by the expansion of the airbag. .

The shim line may be formed by a process for forming a shim line known in the art. For example, a groove-like shim line may be formed on the back surface of the artificial leather by a laser or a knife.

Specifically, when the thickness of the back layer 10 is less than the above range, the thickness of the back layer 10 of the portion where the seam line is formed becomes too thin (for reference, the portion where the seam line is formed is located in the portion where the seam line is not formed). Compared to the thickness of about 0.1-0.2mm, the durability of the artificial leather is lowered and the thickness of the back layer 10 is above the above range, the cost is increased and the moldability cannot be maintained, so it may have a thickness within the above range.

Or, alternatively, if the artificial leather for automobile interior material 1 of the present invention does not have a shim line, the back layer 10 may have a thickness of 0.4-0.9mm, 0.42-0.8mm or 0.45-0.7mm. . It is possible to have a thickness within the above range while preventing the increase in cost while preventing deterioration of mechanical properties such as tensile strength within the above range.

Specifically, when the thickness of the back layer 10 is less than the above range, the thickness of the back layer 10 becomes too thin, the durability of artificial leather is reduced, and when the thickness of the back layer 10 is above the above range, without a shim line The deployment of the airbag is not easy, and the cost is increased and the moldability cannot be maintained, so that the airbag may have a thickness within the above range.

The thickness of the back layer 10 can be obtained by vertically cutting the artificial leather for automobile interior materials, and then measuring the thickness of the back layer 10 in the cut section using a scanning electron microscope. have.

Specifically, after the thickness of the back layer 10 is vertically cut for artificial leather for automobile interior materials, a vertical line is drawn at any five points on the top of the back layer 10 and the back layer 10 meets the vertical line. After measuring the distance to the bottom of each can be obtained by their average value.

Pore layer (20)

The pore layer 20 of the present invention has uniform pores formed in the layer to prevent uneven transfer of the interior material of the vehicle, and to elongation suitable for the sensitivity and covering process, such as soft touch and volume feeling on the artificial leather, and It serves to impart tensile strength for the deployment of airbags. In one embodiment, it is formed using a pore layer composition comprising 20-50 parts by weight of solvent and 0.5-2 parts by weight of pore control agent relative to 100 parts by weight of polyurethane resin. Can be.

More specifically, the pore layer composition may be formed by coating the top of the back layer and then performing a coagulation and water washing process in water in an aqueous dimethylformamide solution.

The dimethylformamide aqueous solution may include, for example, 2-10% by weight or 3-8% by weight of dimethylformamide and 90-98% by weight or 92-97% by weight of water. In addition, the coagulation may be performed, for example, for 4-8 minutes, preferably 5-7 minutes.

Hereinafter, each configuration of the pore layer composition will be described in detail.

Polyurethane resin (A)

The polyurethane resin can be prepared by reacting a polyol with a diisocyanate and a chain extender.

Specifically, the polyol may be, for example, one or more selected from the group consisting of polyether polyol, polyester polyol, and polycarbonate polyol.

The polyether polyol is a diol or polyol having 2 to 15 carbon atoms, specifically, an alkyl diol or glycol, and an alkylene oxide having 2 to 6 carbon atoms, specifically, ethylene oxide or propylene oxide. May be

The polyester polyol may be formed by esterifying one or more glycols with one or more dicarboxylic acids or anhydrides thereof. As a specific example, the glycol may be at least one selected from ethylene glycol, propylene glycol and glycerin, and the dicarboxylic acid may be at least one selected from adipic acid, phthalic acid and maleic acid.

Alternatively, the polyester polyol may be formed by ring-opening polymerization using a small amount of diol, triol or amine as an initiator in lactone or a derivative thereof. As a specific example, it may be polycaprolactone (PCL) synthesized by ring-opening polymerization using diethylene glycol as an initiator in ε-caprolactone (CL).

The polycarbonate polyol may be derived from the reaction of glycol and carbonate.

In the present invention, a specific example of the polyol may be used by mixing 100-150 parts by weight of polyether polyol and 110-200 parts by weight of polycarbonate polyol with respect to 100 parts by weight of the polyester polyol, within the above range. While implementing excellent mechanical properties, it has an excellent effect in hydrolysis resistance and chemical resistance.

In addition, the diisocyanate may be a common one used in the art, and is not particularly limited, 4,4'-diphenylmethane diisocyanate (MDI), xylene diisocyanate (XDI), 1,5-naphthalene diisocyanate, etc. Aromatic diisocyanate having a benzene ring; Aliphatic diisocyanates such as hexamethylene diisocyanate (HDI) and propylene diisocyanate; And alicyclic diisocyanates such as 1,4-cyclohexane diisocyanate, isophorone diisocyanate (IPDI), and 4,4'-dicyclohexylmethane diisocyanate (H12MDI); It may be one or more selected from the group consisting of.

More specifically, one selected from the group consisting of 4,4-diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI) and dicyclohexyl methane diisocyanate (H12MDI). It may be abnormal.

In addition, the chain extender may be a general one used in the art and is not particularly limited, but preferably, a low molecular weight diol compound or diamine compound having an even number of repeating units advantageous for increasing crystallinity may be used.

Specifically, the chain extender is ethylene glycol (EG), diethylene glycol (DEG), propylene glycol (PG), 1,4-butanediol (1,4-BD), 1,6-hexanediol (1,6- HD), methylpentanediol and isophorone diamine (IPDA).

In addition, the chain extender may be used, for example, 1-15 parts by weight or 2-10 parts by weight based on 100 parts by weight of the polyol.

Solvent (B)

The solvent (B) may be one or more selected from the group consisting of dimethylformamide, dimethylacetamide, N-methylpyrrolidone, dimethylsulfoxide and ethyl acetate.

In addition, the solvent (B) may be used as 20-50 parts by weight or 30-45 parts by weight with respect to 100 parts by weight of the polyurethane resin (A), and if it is less than the above range, the viscosity of the pore layer composition is high to form uniform pores This is difficult, and if it exceeds the above range, the viscosity of the pore layer composition is too low, and thus the coating property is lowered, so it can be used within the above range.

Pore regulator (C)

The pore control agent (C) is for forming uniform pores in the pore layer 20, and may use one or more surfactants selected from the group consisting of anion and nonion systems.

The surfactant is composed of a hydrophilic head portion and a hydrophobic tail portion, and thus can form a micelle or liquid crystal structure of various structures through self-assembly in an aqueous solution.

Examples of the anionic surfactant include fatty acids (salts) such as oleic acid, palmitic acid, sodium oleate, potassium palmitate, and triethanolamine oleate; Hydroxyl group-containing carboxylic acids (salts) such as hydroxyacetic acid, potassium hydroxyacetic acid salt, lactic acid and potassium lactate; Polyoxyalkylene alkyl ether acetic acid (salt) such as polyoxyethylene tridecyl ether acetic acid (sodium salt); Salts of carboxyl group polysubstituted aromatic compounds such as potassium trimellitate and potassium pyromellitate; Alkylbenzenesulfonic acid (salt) such as dodecylbenzenesulfonic acid (sodium salt); Polyoxyalkylene alkyl ether sulfonic acids (salts) such as polyoxyethylene 2-ethylhexyl ether sulfonic acid (potassium salt); Higher fatty acid amidesulfonic acids (salts) such as stearoylmethyltaurine (sodium), lauroylmethyltaurine (sodium), myristoylmethyltaurine N (sodium), and palmitoylmethyltaurine (sodium); N-acyl sarcosinate (salt) such as lauroyl sarcosinate (sodium); Alkyl phosphonic acids (salts) such as octyl phosphonate (potassium salt); Aromatic phosphonic acids (salts) such as phenyl phosphonate (potassium salt); Alkyl phosphonic acid alkyl phosphate esters (salts) such as 2-ethylhexyl phosphonate mono 2-ethylhexyl ester (potassium salt); Nitrogen-containing alkylphosphonic acids (salts) such as aminoethylphosphonic acid (diethanolamine salt); Alkyl sulfuric acid esters (salts) such as 2-ethylhexyl sulfate (sodium salt); Polyoxyalkylene sulfate esters (salts) such as polyoxyethylene 2-ethylhexyl ether sulfate (sodium salt); Alkyl phosphate esters (salts) such as lauryl phosphate (potassium salt), cetyl phosphate (potassium salt), and stearyl phosphate (diethanolamine salt); Polyoxyalkylene alkyl (alkenyl) ether phosphate esters (salts) such as polyoxyethylene lauryl ether phosphate (potassium salt) and polyoxyethylene oleyl ether phosphate (triethanolamine salt); Polyoxyalkylene alkylphenyl ether phosphate esters (salts) such as polyoxyethylene nonylphenyl ether phosphate (potassium salt) and polyoxyethylene dodecylphenyl ether phosphate (potassium salt); Long chain sulfofolates such as sodium di-2-ethylhexylsulfofolate and sodium dioctylsulfofolate; long chain N-acylglutamic acids such as N-sodium lauroglutamate monosodium and N-stearoyl-L-disodium sodium glutamate Salt; may be one or more selected from the group consisting of.

Examples of the nonionic surfactant include polyoxyalkylene straight chain alkyl ethers such as polyoxyethylene hexyl ether, polyoxyethylene octyl ether, polyoxyethylene decyl ether, polyoxyethylene lauryl ether, and polyoxyethylene cetyl ether; Polyoxyalkylene branched primary alkyl ethers such as polyoxyetherene 2-ethylhexyl ether, polyoxyethylene isocetyl ether, and polyoxyethylene isostearyl ether; Polyoxyalkyl such as polyoxyethylene 1-hexylhexyl ether, polyoxyethylene 1-octylhexyl ether, polyoxyethylene 1-hexyloctyl ether, polyoxyethylene 1-pentylheptyl ether, polyoxyethylene 1-heptylpentyl ether, etc. Ren branch secondary alkyl ether; Polyoxyalkylene alkenyl ethers such as polyoxyethylene oleyl ether; Polyoxyalkylene alkylphenyl ethers such as polyoxyethylene octyl phenyl ether, polyoxyethylene nonylphenyl ether, and polyoxyethylene dodecylphenyl ether; Polyoxyethylene tristyryl phenyl ether, polyoxyethylene distyrylphenyl ether, polyoxyethylene styrylphenyl ether, polyoxyethylene tribenzylphenyl, polyoxyethylene dibenzylphenyl ether, polyoxyethylene benzylphenyl ether, etc. Alkylene alkylaryl phenyl ether; Polyoxyethylene monolaurate, polyoxyethylene monooleate, polyoxyethylene monostearate, polyoxyethylene monomyristylate, polyoxyethylene dilaurate, polyoxyethylene dioleate, polyoxyethylene dimyristylate, Polyoxyalkylene fatty acid esters such as polyoxyethylene distearate; Sorbitan esters such as sorbitan monopalmitate and sorbitan monooleate; Polyoxyalkylene sorbitan fatty acid esters such as polyoxyethylene sorbitan monostearate and polyoxyethylene sorbitan monooleate; Glycerin fatty acid esters such as glycerin monostearate, glycerin monolaurate, and glycerin monopalmitate; Polyoxyalkylene sorbitol fatty acid esters; Sucrose fatty acid esters; Polyoxyalkylene castor oil ethers such as polyoxyethylene castor oil ether; Polyoxyalkylene cured castor oil ethers such as polyoxyethylene cured castor oil ether; Polyoxyalkylene alkylamino ethers such as polyoxyethylene lauryl amino ether and polyoxyethylene stearyl amino ether; Oxyethylene-oxypropylene block or random copolymer; Terminal alkyl etherifications of oxyethylene-oxypropylene blocks or random copolymers; Terminal sucrose etherates of oxyethylene-oxypropylene blocks or random copolymers; It may be one or more selected from the group consisting of.

In the present invention, as a specific example of the pore control agent (C), a nonionic surfactant having excellent stability over time may be used, and more specifically, polysiloxane modified with polyether may be used.

In addition, the pore control agent (C) may be used as 0.5-2 parts by weight or 0.5-1.5 parts by weight based on 100 parts by weight of the polyurethane resin (A), and if it is less than the above range, sufficient pores are formed in the pore layer 20 The volume feeling is lowered, and after completing the automobile interior covering process, wrinkles may occur on the artificial leather, and the transfer of irregularities in the automobile interior may be insignificant, and if it exceeds the above range, pores become uneven and elongation It can be used within the above range because the surface properties such as abrasion resistance and fouling resistance may deteriorate as well as some wrinkles occur on the artificial leather due to deterioration.

The pore layer composition may, optionally, further include other additives such as a flame retardant, dispersant, or pigment, and the type and content thereof are not limited.

The pore layer 20 of the present invention may have pores evenly distributed in the layer (FIG. 1), or distributed only at the top (FIG. 2), or may be distributed only at the bottom (FIG. 3).

More specifically, referring to FIG. 1, the pore layer 20 of the present invention is uniformly distributed in which an open cell and / or a closed cell are not densely concentrated in any part. It can be a layer. In the present invention, the pore means that the size is at least 50 μm or more, and that the size is less than 50 μm is excluded from the pore.

In addition, the pores may have a size of 50-240㎛, 60-180㎛ or 70-150㎛, within the above range to prevent uneven transfer of automotive interior materials, soft feel and softness of artificial leather, volume, etc. Can be implemented.

In the present invention, the size of the pores means the average length of the diameters that one pore can have, and if the pores are spherical, it means the average of the diameters. It may mean.

The size of the pores can be measured on a cut section using a scanning electron microscope after vertically cutting artificial leather for automobile interior materials.

Or, referring to Figures 2 and 3, the pore layer 20 of the present invention is composed of a non-porous portion 21 located at the bottom and a porous portion 22 positioned at the top, or a porous portion 22 positioned at the bottom. ) And the non-porous portion 21 located on the upper portion.

The pore portion 22 refers to a portion in which open pores and / or closed cells are concentrated, and the non-porous portion 21 means a polyurethane portion that does not contain pores. It can be done (see Fig. 8).

The pores may be included in 5-20, 7-15, or 9-13 within a cross-sectional area of 0.15 mm ² of the pore portion 22, and also prevent uneven transfer of automobile interior materials within the above range, as well as artificial leather. It can be excellent in sensibility such as soft touch and volume.

In addition, the pores may be 60% or more, 70% or more, or 80% or more of the pores included in the cross-sectional area of 0.15 mm ² of the pore portion 22, and may be open cells of the shape, and within the range In addition to preventing the uneven transfer of the interior material, it may be excellent in sensibility such as soft touch and volume feeling on the artificial leather.

In addition, since the size of the pores is the same as described above, duplicate description will be omitted.

The number of pores, the ratio of pores in an open shape, and the size of the pores are 0.15 mm of the pore portion 22 in the cut section using a scanning electron microscope after vertically cutting artificial leather for automobile interior materials. It can be measured within a cross-sectional area of ² (width: 0.5 mm, length: 0.3 mm).

In addition, the thickness ratio of the non-porous portion 21 and the porous portion 22 in the present invention is 0.3-1.5: 1, 0.5-1.5: 1, 0.6-1.4: 1, 0.7-1.3: 1 or 0.8-1.2: The portion of one person may be 70% or more, 80% or more, 85% or more, or 90% or more.

When the thickness ratio of the non-porous part 21 is less than the above range, the elongation of the artificial leather decreases, wrinkles occur, and the tensile strength is high, so airbag deployment is not easy, and when it exceeds the above range, the soft feel, volume, etc. of the artificial leather Since the sensitivity is low and the elongation is small, wrinkles are generated and the appearance is poor, it may be within the above range.

In the present invention, the thickness ratio of the non-porous portion 21 and the porous portion 22 is vertically cut artificial leather for automobile interior materials, and then the pore layer in the cut section using a scanning electron microscope After drawing a vertical line passing through the lowest point of the pores located at the bottom or top of the pores of the pores 22 at any point at the top of the (20), the thickness of the non-pores 21 and the pores 22 is increased. It can be determined and measured.

Specifically, the thickness of the pore portion 22 is after cutting the artificial leather for automobile interior materials vertically, at any point on the top of the pore layer 20 at the bottom or top of the pores of the pore portion 22 After drawing a vertical line passing through the lowest point of the pores located, it can be obtained by measuring the distance from the top or bottom of the pore layer 20 to the lowest or highest point of the pores.

In addition, the thickness of the non-porous portion 21 is vertically cut artificial leather for automobile interior materials, and then draws a vertical line at any point on the top of the pore layer 20 and is located at the bottom or top of the pores that meet the vertical line. It can be obtained by measuring the distance from the lowest or highest point of the pores to the bottom or top of the pore layer 20.

In addition, the pore layer 20 of FIGS. 1, 2, and 3 has a density of 400-800 g / L or 500-700 g / L, and if it is less than the above range, the pores become non-uniform and the automotive interior material covering process is completed. In addition, wrinkles are generated on the artificial leather, and surface properties such as abrasion resistance and contamination resistance may be deteriorated.If it exceeds the above range, wrinkles are generated on the artificial leather after completing the automotive interior covering process. Since it is not desirable to prevent uneven transfer of the vehicle interior material, it may have a density within the above range.

In addition, in one embodiment, when the artificial leather for automobile interior material 1 of the present invention has a shim line, the thickness of the pore layer 20 of FIGS. 1, 2, and 3 is 0.2-0.5mm, 0.2 It can be -0.4mm or 0.25-0.35mm, prevent uneven transfer of automobile interior materials within the above range, and can give elongation and tensile strength suitable for the covering process of artificial leather, soft feel and filling feeling on artificial leather There is an effect that can give a feeling, softness and volume of the back.

More specifically, in the case of FIG. 1 in which pores are evenly distributed in the pore layer 20, the thickness of the pore layer 20 is vertically cut after the artificial leather for automobile interior material, and then the top of the pore layer 20 is After drawing a vertical line at any of five points and measuring the distance to the bottom of the pore layer 10 that meets the vertical line, it can be determined by the average value of these.

Alternatively, in the case of FIGS. 2 and 3 in which the pore layer 20 is divided into the pore portion 22 and the non-porous portion 21, the thickness of the pore layer 20 is any of the upper end of the pore layer 20. The non-porous portion 21 and the thickness of the pore portion 22 at five points may be obtained as an average value.

At this time, the thickness of the non-porous portion 21 and the pore portion 22 may be 0.08-0.42mm or 0.1-0.24mm, respectively, and within the above range, an elongation and tensile strength suitable for the covering process of automobile interior materials are imparted. At the same time, it has the effect of preventing uneven transfer, and giving the artificial leather a feeling of softness, filling, etc., softness and volume.

Or, optionally, when the artificial leather for automobile interior material 1 of the present invention does not have a shim line, the thickness of the pore layer 20 of FIGS. 1, 2, and 3 is 0.4-0.7mm, 0.45- It may be 0.6mm or 0.45-0.5mm, prevent uneven transfer of automobile interior materials within the above range, and can impart elongation and tensile strength suitable for the covering process of artificial leather, soft touch, filling feeling, etc. There is an effect that can give a sense of sensibility, ductility and volume.

More specifically, in the case of FIG. 1 in which the pores in the pore layer 20 are evenly distributed, the method for measuring the thickness of the pore layer 20 is the same as described above, and thus duplicate description will be omitted.

Alternatively, in the case of FIGS. 2 and 3 in which the pore layer 20 is divided into the pore portion 22 and the non-porous portion 21, the method of measuring the thickness of the pore layer 20 is the same as described above. It should be omitted.

At this time, the thickness of the non-porous portion 21 and the pore portion 22 may be 0.13-0.5mm or 0.15-0.4mm or 0.2-0.3mm, respectively, and elongation and tension suitable for the covering process of automobile interior materials within the above range. At the same time as giving strength, it is possible to prevent uneven transfer, and to give an artificial leather a soft touch, a feeling of filling, etc., and a feeling of softness and volume.

Adhesive layer (30)

The adhesive layer 30 of the present invention is for improving the adhesion between the pore layer 20 and the skin layer 40, polyurethane-based, polyamide-based, ethylene vinyl acetate-based, ethylene ethyl acetate-based, styrene-based thermoplastic elastomer, It may be formed using one or more adhesives selected from the group consisting of polyester-based, ethylene-acrylic-based copolymers, and polyolefin-based adhesives.

In one embodiment of the present invention, a polyurethane-based adhesive may be used as the adhesive. In this case, the polyurethane-based adhesive is, for example, 1-25 parts by weight of dimethylformamide or 5-20 parts by weight based on 100 parts by weight of a polyurethane resin. Parts, 15-45 parts by weight of methyl ethyl ketone or 20-40 parts by weight, and 5-20 parts by weight or 10-15 parts by weight of a crosslinking agent.

The thickness of the adhesive layer 30 may be 0.01-0.2mm or 0.02-0.1mm, and within this range, the adhesion between the pore layer 20 and the skin layer 40 may be improved.

Skin layer (40)

The skin layer 40 of the present invention implements a texture similar to natural leather, and in one embodiment, a skin layer composition comprising 10-60 parts by weight of a solvent and 10-40 parts by weight of a pigment with respect to 100 parts by weight of a polyurethane resin It can be formed using.

More specifically, it may be formed by applying and drying the skin layer composition on the release paper.

The polyurethane resin is in the group consisting of polyester polyurethane, polyether polyurethane, polycarbonate polyurethane, polyacetal polyurethane, polyacrylate polyurethane, polyester amide polyurethane, polythioether polyurethane and polyolefin polyurethane. It may be one or more polyurethane resins selected.

In the present invention, as a specific example of the polyurethane resin, a polycarbonate polyurethane resin excellent in hydrolysis resistance and heat resistance may be used.

The solvent may be one or more selected from the group consisting of dimethylformamide, methylethylketone, dimethylacetamide, N-methylpyrrolidone, dimethylsulfoxide and ethyl acetate.

In addition, the solvent may be used in 10-60 parts by weight or 20-55 parts by weight with respect to 100 parts by weight of the polyurethane resin, there is an excellent coating property within the above range.

The pigment may be used commonly used in the art, and the content is not limited, for example, 10-40 parts by weight or 10-25 parts by weight with respect to 100 parts by weight of the polyurethane resin.

In addition, the skin layer composition may further include one or more additives selected from the group consisting of a UV inhibitor, a light stabilizer, an antioxidant, a flame retardant, a slip agent, an antistatic agent, a dispersing agent, and a surfactant. The kind is not limited as long as it does not affect the present invention.

In addition, the skin layer 40 may have a thickness of 0.01-0.3mm or 0.02-0.1mm, and may have an excellent elongation while implementing a texture similar to natural leather within the above range.

In addition, the artificial leather for automobile interior materials of the present invention (1), optionally, to control the glossiness on the surface of the skin layer 40 and improve the functions of light resistance, hydrolysis resistance, chemical resistance, etc. Poems).

Specifically, the surface treatment layer may be formed by applying a surface treatment agent to the surface of the skin layer 40.

The surface treatment agent may be formed using an aqueous surface treatment agent or an oily surface treatment agent, but with respect to 100 parts by weight of the subject as a specific embodiment of the present invention, 1-30 parts by weight or 1-25 parts by weight of the curing agent, and an aqueous solvent 1 -30 parts by weight or 1-25 parts by weight, and 1-10 parts by weight or 1-5 parts by weight of a silicone compound can be formed using a two-component aqueous surface treatment agent.

The subject may be a water-dispersed polycarbonate-based polyurethane resin, but is not limited thereto.

The curing agent may include at least one functional group selected from the group consisting of an aziridine group, an isocyanate group, and a carbodiimide group per molecule.

The silicone compound may be a liquid form in which the polysiloxane is dispersed in water or a bead form of polysiloxane, but may preferably be in a liquid form dispersed in water having a better surface texture.

The aqueous solvent may be water or alcohol or a mixture of water and alcohol.

The silicone compound may be a liquid form in which the polysiloxane is dispersed in water or a bead form of polysiloxane, but may preferably be in a liquid form dispersed in water having a better surface texture.

The surface treatment layer may have a thickness of 1-20 μm or 5-10 μm, but is not limited thereto.

Such, the artificial leather for automobile interior materials of the present invention (1) may have a thickness of 0.85-1.5mm, 0.90-1.3mm or 0.95-1.2mm, an effect that facilitates the covering process without wrinkles within the above range There is.

In addition, in one embodiment, when the artificial leather for automobile interior material 1 of the present invention is provided with a shim line, the thickness ratio of the rear layer 10 and the pore layer 20 is 1.5-3: 1, 1.6-2.9 : 1, 1.7-2.8: 1 or 1.8-2.7: 1. When the thickness ratio of the back layer 10 is less than the above range, the thickness of the back layer 10 of the seam line forming portion becomes too thin, and the durability of the artificial leather is deteriorated and the thickness ratio of the back layer 10 exceeds the above range. Since the thickness of the pore layer 20 is thin, the effect of preventing irregularities of the vehicle interior material is insignificant, and the sensibility such as soft touch and volume of artificial leather is reduced, and the elongation is too large to cause wrinkles, so it may be within the above range.

In addition, the thickness ratio of the back layer 10 and the pore layer 20 is 1.5-3: 1, 1.6-2.9: 1, 1.7-2.8: 1, or 1.8-2.7: 1 where the portion is 70% or more and 80% Or more, 85% or more, or 90% or more.

Or, alternatively, if the artificial leather for automobile interior material 1 of the present invention does not have a shim line, the thickness ratio of the back layer 10 and the pore layer 20 is 0.5-1.5: 1, 0.6-1.4: 1, 0.7-1.3: 1 or 0.8-1.2: 1. If the thickness ratio of the back layer 10 is less than the above range, the thickness of the back layer 10 becomes too thin to decrease the durability of the artificial leather, and if the thickness ratio of the back layer 10 exceeds the above range, the deployment of the airbag without a shim line It is not easy, and the thickness of the pore layer 20 is relatively thin, so the effect of preventing irregularities of automobile interior materials is insignificant, and the sensitivity such as soft touch and volume of artificial leather is reduced, and the elongation is too large, resulting in wrinkles. It can be tomorrow.

In addition, the thickness ratio of the back layer 10 and the pore layer 20 is 0.5-1.5: 1, 0.6-1.4: 1, 0.7-1.3: 1 or 0.8-1.2: 1, the portion of which is 70% or more, 80 % Or more, 85% or more, or 90% or more.

The thickness ratio of the back layer 10 and the pore layer 20 is vertically cut artificial leather for automobile interior materials, and then the thickness of each layer in the cut section is measured using a scanning electron microscope. The detailed measurement method is the same as described above, so duplicate description will be omitted.

In addition, the artificial leather for automobile interior materials of the present invention 1 has a polyurethane content in the back layer 10 and the pore layer 20 of 200-700g / m ² , 250-600g / m ² , or 300-500g / m Can be ² Within the above range, the artificial leather for automobile interior materials is excellent in workability during the covering process, can prevent wrinkles after the covering process, can easily deploy airbags, and can realize excellent durability.

More specifically, when the polyurethane content in the rear layer 10 and the pore layer 20 is less than the above range, the elongation becomes too high, wrinkles are generated in the artificial leather for automobile interior materials and emboss patterns formed on the upper artificial leather Since the appearance increases due to the unevenness of the embossed pattern and the tensile strength is lowered, the durability of the airbag is lowered, and thus the polyurethane content in the above range may be obtained. In addition, when the polyurethane content in the rear layer 10 and the pore layer 20 of the artificial leather for the automobile interior material exceeds the above range, the elongation is lowered, so that it is difficult to pull the artificial leather during the covering process to the automobile interior material After the covering process is deteriorated, wrinkles are generated in the artificial leather for automobile interior materials after the covering process, the appearance is poor, the tensile strength is high, and the deployment of the airbag is not easy.

The polyurethane content in the back layer 10 and the pore layer 20 is impregnated with the back layer 10 and the pore layer 20 in dimethylformamide, so that the back layer 10 and the pore layer 20 ) After melting the polyurethane resin, the dimethylformamide is evaporated to measure the weight (g / m ² ) of the reduced back layer 10 and the pore layer 20 to measure the back layer 10 and the pores. The content of the polyurethane resin in the layer 20 can be measured.

In addition, the artificial leather 1 for automobile interior materials of the present invention has an elongation of 80-180%, 80-170% or 90-150% in the longitudinal direction, and 110-290%, 120-280% or 150- in the width direction. It can be 270% and can prevent wrinkles of artificial leather for automobile interior materials within the above range.

Specifically, when the elongation of the artificial leather for automobile interior materials is less than the above-mentioned range, wrinkles are generated in the artificial leather for automobile interior materials, resulting in poor appearance, and it is difficult to pull the artificial leather during the covering process of the automobile interior material, thereby reducing workability. When the range is exceeded, wrinkles are generated in the artificial leather for automobile interior materials, and the embossed pattern formed on the upper artificial leather increases, resulting in appearance defects due to unevenness of the embossed pattern.

In the present invention, the longitudinal direction means the machine direction, that is, Machine Direction (MD), and the width direction means the Transverse Direction (TD) perpendicular to the machine direction.

The elongation can be measured using a tensile tester (Instron). After drawing 100 mm of the mark (ℓ) on the specimen, it is bitten by the tester and stretched at 200 mm / min.

[Equation 1]

L = (L ₁ -L ₀ ) / L ₀ X 100

(However, L: Elongation (%), L ₀ : Distance between the marks before the test, L ₁ : Distance between the marks after the skin or bubbles break after the test)

In addition, the artificial leather for automobile interior materials of the present invention 1 may have a tensile strength of 80 kgf / 30 mm or less in the longitudinal direction or 70 kgf / 30 mm or less, 70 kgf / 30 mm or less in the width direction, or 60 kgf / 30 mm or less, specifically, length It can be 30-80kgf / 30mm or 35-70kgf / 30mm in the direction, and 20-70kgf / 30mm or 25-60kgf / 30mm in the width direction. Within the above range, the durability of the artificial leather for automobile interior materials is excellent, but airbag deployment is easy.

The tensile strength can be measured using a tensile tester (Instron). After drawing the mark (ℓ) 100mm on the specimen, it is bitten by the tester and pulled to 200mm / min to obtain the maximum weight at which the specimen breaks.

In addition, the artificial leather 1 for automobile interior materials of the present invention may have a softness of 3.6-4.5 or 3.6-4.4, and there is an excellent effect in terms of sensitivity, such as soft feel and filling feeling within the above range.

The softness is a temperature of 23 ± 2 ℃ and a relative humidity of 50 ± 5%, using a ductility measuring instrument (SDL Atlas, ST300D) to press a synthetic leather specimen having a pie (π) of 100 mm into the ST300D instrument 15 It was measured by reading the number of seconds the scale moved.

In addition, the artificial leather for automobile interior materials of the present invention 1 may have a generation amount of volatile organic compounds (VOCs) of 1-300 μg / m ³ or 1-150 μg / m ³ , and an eco-friendly effect within the above range have.

The amount of the volatile organic compounds (VOCs) is produced by placing artificial leather specimens (horizontal and vertical 4 cm x 9 cm) in a 3 L bag and heating for 2 hours in an oven at 65 ° C., then taking the specimen out of the bag After leaving for 30 minutes in a laboratory at 25 ° C., volatile organic compounds (VOCs) emanating from the specimen may be collected and the amount generated may be measured by gas chromatography (GC).

In addition, the artificial leather for automobile interior materials of the present invention 1 may be applied to one or more automobile interior materials selected from the group consisting of a crash pad, door trim, console box, arm rest, head rest and head liner.

The artificial leather for automobile interior materials of the present invention as described above, while preventing irregularities of the automobile interior material, is inexpensive, can prevent wrinkles, and has an effect of easy deployment of airbags.

In addition, the artificial leather for automobile interior materials of the present invention has an excellent effect on sensitivity and ductility.

In addition, the present invention relates to a method for manufacturing artificial leather for automobile interior materials, specifically,

Forming a back layer to impregnate the knitted fabric (S1);

A skin layer forming step (S1 ') of forming a skin layer on the release paper;

A pore layer forming step (S3) of forming a pore layer on the back surface layer;

An adhesive layer forming step (S4) of forming an adhesive layer on the skin layer;

A skin layer laminating step (S5) of laminating a skin layer having an adhesive layer formed on the pore layer; And

A release paper removing step of removing the release paper (S7); Including,

The knitted fabric is a circular knitted fabric,

The artificial leather for automobile interior materials has an elongation of 80-180% in the longitudinal direction and 110-290% in the width direction, the tensile strength is 80kgf / 30mm or less in the longitudinal direction, and 70kgf / 30mm or less in the width direction, covering of automobile interior materials It relates to a manufacturing method of artificial leather for automobile interior materials that are intended to be used in the process (see Fig. 4).

Hereinafter, each step will be described in detail.

Back layer  Forming step (S1)

The back layer forming step (S1) may be a step of impregnating the knitted fabric with an impregnation solution.

Specifically, after impregnating the knitted fabric with an impregnation solution (for example, a polyurethane solution), the polyurethane resin is impregnated with a specific content in the knitted fabric through a coagulation in a dimethylformamide aqueous solution and a water washing process in water to complete the artificial leather. It has the effect of maintaining the elongation suitable for the covering process and the tensile strength suitable for the deployment of the airbag, and has the sensibility such as soft feel and fill feeling and the ability to withstand repeated stretching and contraction.

The knitted fabric, impregnation solution and dimethylformamide aqueous solution have been specifically described above, and thus repeated description thereof will be omitted.

Alternatively, optionally, the back layer forming step (S1) may further include a buffing process step (S0) of forming a brush on one side or both sides of the knitted fabric before impregnating the knitted fabric with an impregnation solution. It has an excellent effect of adhesiveness and sensitivity.

Skin layer  Forming step (S1 ')

The skin layer forming step (S1 ') may be a step of forming a skin layer by applying and drying the skin layer composition on the release paper separately from the back layer forming step (S1).

The release paper may be an embossed pattern.

In addition, the detailed description of the skin layer composition is the same as described above, so a duplicate description will be omitted.

The coating may be applied in one way selected from bar coating, knife coating, roll coating, slit coating, screen printing or spray coating, but is not limited thereto.

The drying may be performed at a temperature of 60-125 ° C or 65-120 ° C for 1-10 minutes or 3-7 minutes until the polyurethane skin layer composition is completely dried.

Pore layer  Forming step (S3)

The pore layer forming step (S3) may be a step of forming a pore layer on the back surface layer.

Specifically, after coating the pore layer composition on the top of the back layer, the pores are formed by forming a wet coating layer in which fine pores are uniformly formed through coagulation and water washing in water in a dimethylformamide aqueous solution and drying them. Layers can be formed.

In the present invention, the wet coating layer is coated with the pore layer composition thinly on the back side, solidified by immersion in an aqueous solution of dimethylformamide, followed by washing with water to perform fine pores. It means the layer formed.

The detailed description of the pore layer composition is the same as described above, so a duplicate description will be omitted.

On the other hand, since the pore layer forming step (S3) is independent of the skin layer forming step (S1 '), it can be performed by changing the stern.

Adhesive layer forming step (S4)

The adhesive layer forming step (S4) is a step of forming an adhesive layer by applying and drying an adhesive on top of the skin layer so that the skin layer and the pore layer bond well, and drying of the adhesive is 70-120 ° C or 75-110 ° C. It can be cured at a temperature of 30 seconds-5 minutes or 1 minute-3 minutes.

On the other hand, since the adhesive layer forming step (S4) is independent of the pore layer forming step (S3), it can be performed by changing the stern after the skin layer forming step (S1 ').

The detailed description of the adhesive is the same as described above, so duplicate description will be omitted.

Skin layer Merger stage (S5)

The skin layer laminating step (S5) is a step of laminating so that the skin layer and the pore layer are bonded, and may be aged at a temperature of 60-95 ° C or 70-90 ° C for 40-60 hours or 45-55 hours.

Hyungji Lee  Removal step (S7)

The release paper removing step (S7) is a step of peeling off the release paper located on one surface of the skin layer, the back layer being a knitted fabric impregnated from bottom to top through the step; Pore layer; Adhesive layer; And it is completed the manufacture of artificial leather for automobile interior materials of the present invention comprising a skin layer.

The manufacturing method of the artificial leather for automobile interior materials of the present invention may optionally further include a step (S9) of forming a surface treatment layer by applying a surface treatment agent on the skin layer after the release paper removing step (S7).

Specifically, the surface treatment layer may be formed by applying and drying a surface treatment agent on the top of the skin layer, which is the uppermost layer from which the release paper is removed.

The detailed description of the surface treatment agent is the same as described above, so duplicate description will be omitted.

Hereinafter, preferred examples are provided to help understanding of the present invention, but the following examples are merely illustrative of the present invention, and it is apparent to those skilled in the art that various changes and modifications can be made within the scope and technical scope of the present invention. It is natural that changes and modifications fall within the scope of the appended claims.

< Example >

1. Manufacture of artificial leather for automobile interior materials

[ Example  One]

(1) Back layer forming step (S1)

After impregnating the circular knitted fabric formed by weaving 120-170 denier polyester yarn into an impregnation solution, this is coagulated in a 5% aqueous solution of dimethylformamide and washed with water in water to impregnate the polyurethane resin. A back layer having a thickness of 0.6 mm was formed.

The impregnation solution is a polyurethane solution containing 250 parts by weight of dimethylformamide, 25 parts by weight of a flame retardant and 30 parts by weight of a pigment with respect to 100 parts by weight of a polyurethane resin.

(2) Pore layer formation step (S3)

Subsequently, 35 parts by weight of dimethylformamide, 100 parts by weight of the polyurethane resin on top of the back layer, 1.5 parts by weight of pore control agent (UNIK, BYK-L 9525), 10 parts by weight of flame retardant, dispersant (BYK Korea, DISPERBYK -130) After coating the pore layer composition containing 0.5 parts by weight and 10 parts by weight of pigment, this is a wet coating layer in which fine pores are uniformly formed through 7 minutes of coagulation and washing with water in a 5% dimethylformamide aqueous solution. Was formed and dried through a heat tender to form a pore layer having a thickness of 0.3 mm on top of the back layer.

At this time, the thickness of the non-pores in the pore layer was 0.08 mm, and the thickness of the pores was 0.22 mm (see FIG. 8).

(3) Skin layer forming step (S1 ')

After applying the skin layer composition containing 15 parts by weight of dimethylformamide, 30 parts by weight of methyl ethyl ketone and 15 parts by weight of pigment to 100 parts by weight of the polyurethane resin on the release paper on which the embossed pattern is formed, dried at 100 ° C. for 5 minutes A skin layer having a thickness of 0.04 mm was formed.

(4) Adhesive layer forming step (S4)

Subsequently, after applying a polyurethane-based adhesive containing 5-20 parts by weight of dimethylformamide, 20-40 parts by weight of methyl ethyl ketone and 10-15 parts by weight of a crosslinking agent to 100 parts by weight of the polyurethane resin on the skin layer, 90 ° C Cured for 1 minute to form an adhesive layer having a thickness of 0.08 mm.

(5) Skin layer forming step (S5) and release paper removing step (S7)

Subsequently, the adhesive layer and the pore layer on the top of the skin layer were bonded, aged at a temperature of 80 ° C. for 48 hours, and then the release paper on the bottom of the skin layer was peeled off.

(6) Surface treatment layer forming step (S9)

Subsequently, the two-part aqueous solution containing 1-25 parts by weight of a curing agent, 1-25 parts by weight of an aqueous solvent, and 1-5 parts by weight of a silicone compound with respect to 100 parts by weight of the polyurethane resin as a subject on the skin layer from which the release paper was peeled off. A surface treatment layer having a thickness of 10 µm was formed by applying a surface treatment agent.

Using a Thomson press machine (Sewoong Industries Co., Ltd., SW-900S) on the back side, which is the back side of the artificial leather for automobile interior material of Example 1 having a thickness of 1.03 mm as described above. A seam line was formed.

[ Example  2]

It was carried out in the same manner as in Example 1 except for the following pore layer forming step (S3).

(2) Pore layer formation step (S3)

35 parts by weight of dimethylformamide, 100 parts by weight of polyurethane resin on top of the back layer, 1.3 parts by weight of pore control agent (Uni Materials, BYK-L 9525), 10 parts by weight of flame retardant, dispersant (BYK Korea, DISPERBYK-130 ) After coating the pore layer composition containing 0.5 parts by weight and 10 parts by weight of pigment, it is coagulated for 7 minutes in 5% dimethylformamide aqueous solution and washed with water to form a wet coating layer with fine pores uniformly formed. And dried it through a heat tender to form a pore layer having a thickness of 0.3 mm on top of the back layer.

At this time, the thickness of the non-porous portion in the pore layer was 0.10 mm, and the thickness of the porous portion was 0.2 mm.

[ Example  3]

It was carried out in the same manner as in Example 1 except for the following pore layer forming step (S3).

(2) Pore layer formation step (S3)

On top of the back layer, 35 parts by weight of dimethylformamide, 100 parts by weight of polyurethane resin, 0.8 parts by weight of pore control agent (Uni Materials, BYK-L 9525), 10 parts by weight of flame retardant, dispersant (BYK Korea, DISPERBYK-130 ) After coating the pore layer composition containing 0.5 parts by weight and 10 parts by weight of pigment, it is coagulated in a 5% aqueous solution of dimethylformamide for 4 minutes and washed with water to form a wet coating layer with fine pores uniformly formed. And dried it through a heat tender to form a pore layer having a thickness of 0.3 mm on top of the back layer.

At this time, the thickness of the non-porous portion in the pore layer was 0.15 mm, and the thickness of the porous portion was 0.15 mm.

[ Example  4]

(1) Back layer forming step (S1)

After impregnating the circular knitted fabric formed by weaving 120-170 denier polyester yarn into an impregnation solution, this is coagulated in a 5% aqueous solution of dimethylformamide and washed with water in water to impregnate the polyurethane resin. A back layer having a thickness of 0.45 mm was formed.

The impregnation solution is a polyurethane solution containing 250 parts by weight of dimethylformamide, 25 parts by weight of a flame retardant and 30 parts by weight of a pigment with respect to 100 parts by weight of a polyurethane resin.

(2) Pore layer formation step (S3)

Subsequently, 35 parts by weight of dimethylformamide, 100 parts by weight of polyurethane resin on top of the back layer, 1 part by weight of pore control agent (UNIK, BYK-L 9525), 10 parts by weight of flame retardant, dispersant (BYK Korea, DISPERBYK -130) After coating the pore layer composition containing 0.5 parts by weight and 10 parts by weight of pigment, this is a wet coating layer in which fine pores are uniformly formed through a coagulation process in a 5% dimethylformamide aqueous solution for 7 minutes and a water washing process in water. Was formed and dried through a heat tender to form a pore layer having a thickness of 0.5 mm on the top of the back layer.

At this time, the thickness of the non-porous portion in the pore layer was 0.22 mm, and the thickness of the porous portion was 0.28 mm.

(3) Skin layer forming step (S1 ')

After applying the skin layer composition containing 15 parts by weight of dimethylformamide, 30 parts by weight of methyl ethyl ketone and 15 parts by weight of pigment to 100 parts by weight of the polyurethane resin on the release paper on which the embossed pattern is formed, dried at 100 ° C. for 5 minutes A skin layer having a thickness of 0.04 mm was formed.

(4) Adhesive layer forming step (S4)

Subsequently, after applying a polyurethane-based adhesive containing 5-20 parts by weight of dimethylformamide, 20-40 parts by weight of methyl ethyl ketone and 10-15 parts by weight of a crosslinking agent to 100 parts by weight of the polyurethane resin on the skin layer, 90 ° C Cured for 1 minute to form an adhesive layer having a thickness of 0.08 mm.

(5) Skin layer forming step (S5) and release paper removing step (S7)

Subsequently, the adhesive layer and the pore layer on the top of the skin layer were bonded, aged at a temperature of 80 ° C. for 48 hours, and then the release paper on the bottom of the skin layer was peeled off.

(6) Surface treatment layer forming step (S9)

Subsequently, the two-part aqueous solution containing 1-25 parts by weight of a curing agent, 1-25 parts by weight of an aqueous solvent, and 1-5 parts by weight of a silicone compound with respect to 100 parts by weight of the polyurethane resin as a subject on the skin layer from which the release paper was peeled off. A surface treatment layer having a thickness of 10 µm was formed by applying a surface treatment agent.

The artificial leather for automobile interior material of Example 4 having a thickness of 1.08 mm was prepared as described above.

[ Example  5]

It was carried out in the same manner as in Example 4, except for the following pore layer forming step (S3).

(2) Pore layer formation step (S3)

35 parts by weight of dimethylformamide relative to 100 parts by weight of polyurethane resin on the back layer, 0.8 parts by weight of pore control agent (Uni-Material, BYK-L 9525), 10 parts by weight of flame retardant, dispersant (BYK Korea, DISPERBYK-130 ) After coating the pore layer composition containing 0.5 parts by weight and 10 parts by weight of pigment, it is coagulated for 5 minutes in 5% dimethylformamide aqueous solution and washed with water to form a wet coating layer in which fine pores are uniformly formed. And dried it through a heat tender to form a pore layer with a thickness of 0.5 mm on top of the back layer.

At this time, the thickness of the non-porous portion in the pore layer was 0.25 mm, and the thickness of the pore portion was 0.25 mm.

[ Comparative example  One]

(1) Back layer forming step (S1)

After forming a web using a single fiber island yarn having a weight ratio of 60-80: 40-50 of nylon (component) and polyester (sea component), the web is combined with a plurality of needles by needle punching. The prepared nonwoven fabric was prepared.

Subsequently, the nonwoven fabric was subjected to a reduction process in a 5% NaOH aqueous solution to dissolve the sea parts, and then polished to form a back layer having a thickness of 0.6 mm, which is a ultrafine nonwoven fabric.

(2) Pore layer forming step (S3): was not performed.

(3) Skin layer forming step (S1 ')

After applying the skin layer composition containing 15 parts by weight of dimethylformamide, 30 parts by weight of methyl ethyl ketone and 15 parts by weight of pigment to 100 parts by weight of the polyurethane resin on the release paper on which the embossed pattern is formed, dried at 100 ° C. for 5 minutes A skin layer having a thickness of 0.04 mm was formed.

(4) Adhesive layer forming step (S4)

Subsequently, after applying a polyurethane-based adhesive containing 5-20 parts by weight of dimethylformamide, 20-40 parts by weight of methyl ethyl ketone and 10-15 parts by weight of a crosslinking agent to 100 parts by weight of the polyurethane resin on the skin layer, 90 ° C Cured for 1 minute to form an adhesive layer having a thickness of 0.38 mm.

(5) Skin layer forming step (S5) and release paper removing step (S7)

Subsequently, the adhesive layer and the back layer on the top of the skin layer were bonded and aged at a temperature of 80 ° C. for 48 hours, and then the release paper on the bottom of the skin layer was peeled off.

(6) Surface treatment layer forming step (S9)

Subsequently, an oil-based surface treatment agent containing 95% by weight of urethane acrylate and 5% by weight of methylene dicyclohexyl diisocyanate as a curing agent was applied to the top of the peeled skin layer to form a surface treatment layer having a thickness of 10 μm.

A seam line was formed using a Thompson press machine (Sewoong Industries Co., Ltd., SW-900S) on the back side of the artificial leather for automobile interior material of Comparative Example 1 having a thickness of 1.03 mm as described above.

[ Comparative example  2]

(1) Back layer forming step (S1)

After impregnating the circular knitted fabric formed by weaving 120-170 denier polyester yarn into an impregnation solution, this is coagulated in a 5% aqueous solution of dimethylformamide and washed with water in water to impregnate the polyurethane resin. A back layer having a thickness of 0.6 mm was formed.

The impregnation solution is a polyurethane solution containing 250 parts by weight of dimethylformamide, 25 parts by weight of a flame retardant and 30 parts by weight of a pigment with respect to 100 parts by weight of a polyurethane resin.

(2) Pore layer forming step (S3): was not performed.

(3) Skin layer forming step (S1 ')

After applying the skin layer composition containing 15 parts by weight of dimethylformamide, 30 parts by weight of methyl ethyl ketone and 15 parts by weight of pigment to 100 parts by weight of the polyurethane resin on the release paper on which the embossed pattern is formed, dried at 100 ° C. for 5 minutes A skin layer having a thickness of 0.04 mm was formed.

(4) Adhesive layer forming step (S4)

Subsequently, after applying a polyurethane-based adhesive containing 5-20 parts by weight of dimethylformamide, 20-40 parts by weight of methyl ethyl ketone and 10-15 parts by weight of a crosslinking agent to 100 parts by weight of the polyurethane resin on the skin layer, 90 ° C Cured for 1 minute to form an adhesive layer having a thickness of 0.38 mm.

(5) Skin layer forming step (S5) and release paper removing step (S7)

Subsequently, the adhesive layer and the back layer on the top of the skin layer were bonded and aged at a temperature of 80 ° C. for 48 hours, and then the release paper on the bottom of the skin layer was peeled off.

(6) Surface treatment layer forming step (S9)

Subsequently, the two-part aqueous solution containing 1-25 parts by weight of a curing agent, 1-25 parts by weight of an aqueous solvent, and 1-5 parts by weight of a silicone compound with respect to 100 parts by weight of the polyurethane resin as a subject on the skin layer from which the release paper was peeled off. A surface treatment layer having a thickness of 10 µm was formed by applying a surface treatment agent.

A seam line was formed using a Thompson press machine (Sewoong Industries Co., Ltd., SW-900S) on the back side of the artificial leather for automobile interior material of Comparative Example 2 having a thickness of 1.03 mm as described above.

[ Comparative example  3]

It was carried out in the same manner as in Example 1 except for the following pore layer forming step (S3).

(2) Pore layer formation step (S3)

35 parts by weight of dimethylformamide, 100 parts by weight of polyurethane resin on top of the back layer, 2.2 parts by weight of pore control agent (Uni Materials, BYK-L 9525), 10 parts by weight of flame retardant, dispersant (BYK Korea, DISPERBYK-130 ) After coating the pore layer composition containing 0.5 parts by weight and 10 parts by weight of pigment, it is coagulated in a 5% aqueous solution of dimethylformamide for 10 minutes and subjected to a water washing process in water to form a wet coating layer in which fine pores are uniformly formed. And dried it through a heat tender to form a pore layer having a thickness of 0.3 mm on top of the back layer.

At this time, the thickness of the non-pores in the pore layer was 0.05 mm, and the thickness of the pores was 0.25 mm.

[ Comparative example  4]

It was carried out in the same manner as in Example 1 except for the following pore layer forming step (S3).

(2) Pore layer formation step (S3)

Subsequently, 35 parts by weight of dimethylformamide with respect to 100 parts by weight of polyurethane resin on the back layer, 0.7 parts by weight of pore control agent (Uni-Material, BYK-L 9525), 10 parts by weight of flame retardant, dispersant (BYK Korea, DISPERBYK -130) After coating the pore layer composition containing 0.5 parts by weight and 10 parts by weight of pigment, this is a wet coating layer in which fine pores are uniformly formed through coagulation and washing in water for 3 minutes in 5% dimethylformamide aqueous solution. Was formed and dried through a heat tender to form a pore layer having a thickness of 0.3 mm on top of the back layer.

At this time, the thickness of the non-pores in the pore layer was 0.25 mm, and the thickness of the pores was 0.05 mm.

2. Measurement of physical properties and sensibility of artificial leather for automobile interior materials

The elongation, tensile strength, ductility, and thickness of each layer of the artificial leathers of Examples 1-5 and Comparative Examples 1-4 prepared above were measured, and after the covering process of the automobile interior material was completed, irregularities were prevented from being transferred, wrinkles were prevented, and Sensitivity (soft feel and fill feeling) was measured, and the results are shown in Table 1 below.

Specifically, the elongation, tensile strength, ductility, and thickness of the artificial leather were measured before the seam line was formed, and the uneven transfer prevention, wrinkle prevention, and sensitivity were measured after the vehicle interior material covering process was completed after the seam line was formed.

The specific measuring method is as follows.

(1) Elongation: A tensile tester (Instron) was used, and after drawing 100 mm of the mark (ℓ) on the specimen of FIG. 5, it was bitten by the tester and stretched at 200 mm / min. It was calculated accordingly.

[Equation 1]

L = (L ₁ -L ₀ ) / L ₀ X 100

(However, L: Elongation (%), L ₀ : Distance between the marks before the test, L ₁ : Distance between the marks after the skin or bubbles break after the test)

(2) Tensile strength: A tensile tester (Instron) was used, and after drawing 100 mm of mark (ℓ) on the specimen of FIG. 5, the specimen was bitten and pulled to 200 mm / min to obtain the maximum weight when the specimen fractured. .

(3) Whether to prevent uneven transfer: After completing the covering process of the interior material of the car with the artificial leather, it was visually checked for the presence / absence of uneven transfer.

It is indicated as X when the uneven transfer is entirely, △ when the uneven transfer is partially, and ○ when there is no uneven transfer.

(4) Whether wrinkles are prevented: After completing the covering process of the interior material of the car with the artificial leather, it was visually checked for the presence or absence of wrinkles.

It is indicated by X when wrinkles occur entirely, △ when wrinkles partially occur, and ○ when wrinkles do not occur.

(5) Sensibility: After completing the covering process of automobile interior materials with the above artificial leather, the artificial leather experts touched and confirmed the soft feel and filling feeling.

It is indicated by ○ when the sensitivity is excellent, △ when the sensitivity is flat, and X when the sensitivity is poor.

(6) Softness: After preparing a synthetic leather specimen having a pi (π) of 100 mm using a ductility measuring instrument (SDL Atlas, ST300D) under conditions of temperature 23 ± 2 ℃ and relative humidity 50 ± 5%, It was measured by reading the numerical value of the scale moving for 15 seconds by pressing with the ST300D device.

(7) Thickness of each layer constituting artificial leather

The thickness of each layer constituting the artificial leather is measured vertically by cutting the artificial leather, and then measuring the thickness of each layer using a photograph of a cross section cut at 300 times using a scanning electron microscope (Hitachi, SU8010). Did.

Among them, the surface treatment layer, the skin layer, and the adhesive layer having a relatively uniform thickness show similar values when measuring the thickness of any part, so draw a vertical line at any point on the top of each layer and the bottom of each layer that meets the vertical line. The distance measured to the value was taken as the thickness of the layer.

On the other hand, the thickness of the back layer is determined by drawing a vertical line at any five points on the top of the back layer, measuring the distance to the bottom of the back layer that meets the vertical line, and obtaining the average value of these to be the thickness of the back layer. The thickness of the layer was determined as the thickness of the pore layer by obtaining the average value of the sum of the thicknesses of the non-porous portion and the pore portion at any five points on the top of the pore layer.

In addition, the thickness ratio was calculated by the thickness of the back layer and the pore layer.

(8) The thickness of the non-porous portion and the porous portion in the pore layer

After the artificial leather was cut vertically, the thickness of the pores and the non-pores was measured using a photograph taken at a 300-fold cross-section using a scanning electron microscope (Hitachi, SU8010).

Specifically, after cutting the artificial leather for automobile interior materials vertically, after drawing a vertical line passing through the lowest point of the pores located at the bottom of the pores of the pores at any point on the top of the pore layer, the top of the pore layer The distance from the pores to the lowest point was measured to be the thickness of the pores.

In addition, after cutting the artificial leather for automobile interior materials vertically, after drawing a vertical line passing through the lowest point of the pores located at the bottom of the pores at any point on the top of the pore layer, pores at the lowest point of the pores The distance to the bottom of the layer was measured to be the thickness of the non-porous portion.

 In addition, the thickness ratio was calculated by the thickness of the non-porous portion and the pore portion.

Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Surface treatment layer Thickness (mm) 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 Skin layer Thickness (mm) 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 Adhesive layer Thickness (mm) 0.08 0.08 0.08 0.08 0.08 0.38 0.38 0.08 0.08 Pore layer The presence or absence ○ ○ ○ ○ ○ X X ○ ○ thickness 0.3 0.3 0.3 0.5 0.5 - - 0.3 0.3 Non-pore part thickness (mm) 0.08 0.10 0.15 0.22 0.25 - - 0.05 0.25 Pore thickness (mm) 0.22 0.20 0.15 0.28 0.25 - - 0.25 0.05 Thickness ratio of non-porosity and porosity 0.36: 1 0.5: 1 1: 1 0.78: 1 1: 1 - - 0.2: 1 5: 1 Back layer Kinds Impregnated circular knit fabric Impregnated circular knit fabric Impregnated circular knit fabric Impregnated circular knit fabric Impregnated circular knit fabric Non-impregnated non-woven fabric Impregnation circular knitting Impregnated circular knit fabric Impregnated circular knit fabric Thickness (mm) 0.6 0.6 0.6 0.45 0.45 0.6 0.6 0.6 0.6 Thickness ratio of back layer and pore layer 2: 1 2: 1 2: 1 0.9: 1 0.9: 1 - - 2: 1 2: 1 Leatherette Thickness (mm) 1.03 1.03 1.03 1.08 1.08 1.03 1.03 1.03 1.03 Elongation (%) Length (MD) 140 110 92 104 128 40 68 73 75 Width (TD) 260 160 197 160 182 60 295 239 103 Tensile strength (kgf / 30mm) Length (MD) 53 45 50 45 40 87 80 84 84 Width (TD) 41 44 40 38 30 72 52 25.2 41 Prevention of irregularities ○ ○ ○ ○ ○ X X ○ △ Prevention of wrinkles ○ ○ ○ ○ ○ X X △ △ Emotion ○ ○ ○ ○ ○ X △ ○ △ ductility 4.2 4.0 4.0 4.4 4.0 2.3 3 4.6 3.2

As shown in Table 1, the artificial leather for automobile interior materials having the shim lines of Examples 1 to 3 according to the present invention, and the artificial leather for automobile interior materials without the shim lines of Examples 4 to 5 are lower From the top to the back layer; Pore layer; Adhesive layer; And a skin layer, but using a circular knitted fabric as the backing layer, the tensile strength of artificial leather for automobile interior materials is 80 kgf / 30 mm or less in the longitudinal direction, and 70 kgf / 30 mm or less in the width direction. However, it has been confirmed that the elongation is excellent, so that the wrinkles of the artificial leather for automobile interior materials are prevented and the irregularities of the automobile interior materials are prevented, and the sensitivity and ductility are also excellent (see FIG. 7).

On the other hand, the artificial leather of Comparative Example 1 using a non-impregnated non-woven fabric as a backing layer had very low elongation and could not prevent wrinkles, and the tensile strength was higher than that of the artificial leathers of Examples 1 to 5, and airbag deployment was not easy. Sensitivity and ductility were also lowered, and particularly, since the pore layer was also not included, it was confirmed that the uneven transfer prevention was greatly reduced.

In addition, Comparative Example 2 using an impregnated circular knitted fabric as a backing layer did not contain a pore layer, resulting in reduced elongation and wrinkles, preventing uneven transfer, and being more sensitive and soft compared to the artificial leathers of Examples 1 to 5. It was confirmed that it was lowered.

In addition, although the impregnated circular knitted fabric was used as the back layer, the thickness ratio of the non-porous portion and the pore portion in the pore layer does not satisfy 0.5-1.5: 1, that is, the thickness of the pore portion is too thick compared to the non-porous portion. It was confirmed that the elongation of the artificial leather was lowered, so that the anti-wrinkle effect was lowered and the tensile strength was higher than that of the artificial leathers of Examples 1 to 5, making it difficult to deploy the airbag.

In addition, although an impregnated circular knitted fabric was used as the backing layer, Comparative Example 4 in which the thickness ratio of the non-pores in the pore layer and the pores did not satisfy 0.5-1.5: 1, that is, the thickness of the pores was too thin compared to the non-pores. It was confirmed that the synthetic leather of the lowered elongation lowered the anti-wrinkle effect compared to the artificial leathers of Examples 1 to 5, and the tensile strength was high, so that airbag deployment was not easy and the uneven transfer prevention, sensitivity and ductility were also lowered.

〔Description of code〕

1: Artificial leather for automobile interior materials

10: back layer 20: pore layer

21: non-pore part 22: pore part

30: adhesive layer 40: skin layer

Claims (15)

From bottom to top, back layer 10; Pore layer 20; Adhesive layer 30; And artificial leather for automotive interior material comprising a skin layer 40, The back layer 10 includes a circular knitted fabric (丸 編 布), The artificial leather for automobile interior materials has an elongation of 80-180% in the longitudinal direction and 110-290% in the width direction, the tensile strength is 80kgf / 30mm or less in the longitudinal direction, and 70kgf / 30mm or less in the width direction, covering of automobile interior materials Artificial leather for automobile interior materials intended to be used in the process. According to claim 1, The back layer 10 is a synthetic leather for automobile interior materials that is a circular knitted fabric impregnated with polyurethane. According to claim 1, The artificial leather for automobile interior materials has an elongation of 80-170% in the longitudinal direction and 120-280% in the width direction. According to claim 1, The artificial leather for automobile interior materials has a tensile strength of 70 kgf / 30 mm or less in the longitudinal direction and 60 kgf / 30 mm or less in the width direction. According to claim 1, The thickness ratio of the back layer 10 and the pore layer 20 is 1.5-3: 1. According to claim 1, The thickness ratio between the back layer 10 and the pore layer 20 is 0.5-1.5: 1, artificial leather for automobile interior materials. According to claim 1, The pore layer 20 is composed of a non-porous portion 21 located at the bottom and the pore portion 22 located at the top. The method of claim 7, Artificial leather for automobile interior materials in which the portion having a thickness ratio of 0.3-1.5: 1 between the non-porous portion 21 and the porous portion 22 is 70% or more. According to claim 1, The artificial leather for automobile interior materials has a softness of 3.6-4.5. The method of claim 5, The artificial leather for automobile interior material has a seam line on the rear surface of the rear surface, and one or more automobile interior materials selected from the group consisting of a crash pad, door trim, console box, arm rest, head rest and head liner. Artificial leather for automobile interior materials that is intended to be used in the covering process. The method of claim 6, The artificial leather for the interior of the vehicle does not have a seam line on the back layer, which is the back surface, and one or more cars selected from the group consisting of crash pads, door trims, console boxes, arm rests, head rests, and head liners. Artificial leather for automotive interior materials intended to be used in the covering process of interior materials. According to claim 1, The thickness of the artificial leather for automobile interior materials is 0.85-1.5mm. Forming a back layer to impregnate the knitted fabric (S1); A skin layer forming step (S1 ') of forming a skin layer on the release paper; A pore layer forming step (S3) of forming a pore layer on the back surface layer; An adhesive layer forming step (S4) of forming an adhesive layer on the skin layer; A skin layer laminating step (S5) of laminating a skin layer having an adhesive layer formed on the pore layer; And A release paper removing step of removing the release paper (S7); As a method of manufacturing artificial leather for automobile interior materials, including, The knitted fabric is a circular knitted fabric (丸 編 布), The artificial leather for automobile interior materials has an elongation of 80-180% in the longitudinal direction and 110-290% in the width direction, the tensile strength is 80kgf / 30mm or less in the longitudinal direction, and 70kgf / 30mm or less in the width direction, covering of automobile interior materials A method of manufacturing artificial leather for automobile interior materials intended to be used in a process. The method of claim 13, The skin layer forming step (S1 ') is a step of applying and drying the skin layer composition on the release paper to form a skin layer, The skin layer composition comprises 10-60 parts by weight of a solvent and 10-40 parts by weight of a pigment relative to 100 parts by weight of a polyurethane resin. The method of claim 13, The pore layer forming step (S3) is a step of forming a pore layer by applying a pore layer composition on top of the impregnated knitted fabric, and then coagulating and washing in an aqueous dimethylformamide solution. The pore layer composition is a method for manufacturing artificial leather for automobile interior materials comprising 20-50 parts by weight of a solvent and 0.5-2 parts by weight of a pore control agent based on 100 parts by weight of a polyurethane resin.

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