JPH11100779A - Synthetic leather - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a synthetic leather that has soft fabric hand and shows excellent resistance to peeling after recurring extensions by forming a synthetic resin coating layer on at least one face of the base fabric made of poly(trimethylene terephthalate) fibers. SOLUTION: A base fabric is a woven, knitted or nonwoven fabric made of poly(trimethylene terephthalate) fibers with the total yarn fineness of 20-300 deniers and the filament fineness of 0.1-5 deniers and has a unit weight 50-200 g/m<2> . The base fabric is coated with a synthetic resin such as polyurethane by the dry or wet process to form a coating layer thereby producing the objective synthetic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a synthetic leather using polytrimethylene terephthalate fiber as a fiber constituting a fiber base fabric, and provides a synthetic leather having a soft feel and excellent peeling resistance when repeatedly stretched. Things.

[0002]

2. Description of the Related Art Conventionally, what is called synthetic leather is cow,
It is used to imitate natural leather such as horses and sheep.Synthetic leather is coated or laminated with a synthetic resin dissolved with a solvent on a fiber base fabric such as woven or knitted fabric using a dry method. There are known dry synthetic leather made by the above method and wet synthetic leather made by coating a synthetic resin dissolved by using a solvent on a fiber base fabric such as a woven fabric or a nonwoven fabric by a wet method.

[0003] Natural leather has a structure in which ultrafine collagen fibers are three-dimensionally entangled, and the density is coarser toward the inside and denser toward the surface, and the dense fiber layer on the surface is dyed with a dye. It is known that the material or pigment is colored. On the other hand, for example, wet synthetic leather is formed on a woven or non-woven fabric layer by applying a synthetic resin by a wet method to obtain elasticity and moisture permeability by a wet method, and further formed thereon. And three colored surface layers, which are fundamentally different from each other in terms of structure.

As described above, due to the difference in structure between synthetic leather and natural leather, there are many differences in their characteristics. The differences are strength, feel, feeling, moisture release, moisture absorption, coloring, weather resistance, stretchability, peel resistance, etc.
In particular, there is a specific problem regarding the peel resistance due to the structure of the synthetic leather. Strength, feel, feel, and peel resistance have been significantly improved as a result of studies such as improving the properties of synthetic resins, adjusting the thickness of the resin film, or adjusting the degree of penetration of the resin into the base layer. However, it is still not enough.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a synthetic leather in which the above problems are improved, and to provide a synthetic leather having a soft texture and excellent peeling resistance when repeatedly stretched. is there.

[0006]

SUMMARY OF THE INVENTION In view of the above problems, the present invention is different from the conventional examination means, and is a result of intensive studies particularly on the fibers constituting the fiber base fabric, that is, the woven fabric, knitted fabric or non-woven fabric. The present invention has been made. That is, the present invention is a synthetic leather in which a synthetic resin coating layer is formed on at least one surface of a fiber base fabric having a basis weight of 50 to 200 g / m ² , wherein polytrimethylene terephthalate fiber is used as a fiber constituting the fiber base fabric. The synthetic leather is characterized by using.

In the present invention, the polytrimethylene terephthalate fiber refers to a polyester fiber having a trimethylene terephthalate unit as a main repeating unit, and has a trimethylene terephthalate unit content of about 50% or more, preferably 70 mol% or more, and more preferably 80% or more. Mol% or more,
Particularly preferably, it is 90 mol% or more. Therefore, the total amount of the other acid component and / or glycol component as the third component is within a range of about 50 mol% or less, preferably 30 mol% or less, more preferably 20 mol% or less, and particularly preferably 10 mol% or less. Contains the contained polytrimethylene terephthalate fiber.

[0008] Polytrimethylene terephthalate is produced by combining terephthalic acid or a functional derivative thereof with trimethylene glycol or a functional derivative thereof under appropriate reaction conditions in the presence of a catalyst. In this production process, an appropriate one or more third components may be added to form a copolymerized polyester, or a polyester other than polytrimethylene terephthalate such as polyethylene terephthalate, a polyester such as nylon, and polytrimethylene terephthalate may be separately prepared. , And then blended or composite-spun (sheath core, side-by-side, etc.).

The third component to be added includes fatty acid dicarboxylic acid (oxalic acid, adipic acid), alicyclic dicarboxylic acid (cyclohexanedicarboxylic acid, etc.), aromatic dicarboxylic acid (isophthalic acid, sodium sulfoisophthalic acid), fatty acid Aliphatic glycols (ethylene glycol, 1,2-propylene glycol, tetramethylene glycol, etc.), alicyclic glycols (cyclohexane glycol, etc.), aromatic dioxy compounds (hydroquinone bisphenol A)
And the like, aliphatic glycols containing aromatics (such as 1,4-bis (β-hydroxyethoxy) benzene), and aliphatic oxycarboxylic acids (such as P-oxybenzoic acid). Compounds having one or more ester-forming functional groups (benzoic acid, glycerin, etc.) can also be used as long as the polymer is substantially linear.

Further, polytrimethylene terephthalate fibers include a matting agent such as titanium dioxide, a stabilizer such as phosphoric acid, an ultraviolet absorber such as hydroxybenzophenone derivative, a crystallization nucleating agent such as talc, and a lubricant such as aerosil. , A hindered phenol derivative antioxidant, a flame retardant, an antistatic agent, a pigment, a fluorescent brightener, an infrared absorber, an antifoaming agent, and the like. The polytrimethylene terephthalate fiber used in the present invention has an elastic modulus of 20 to 40.
(G / d), and the elastic recovery after elongation treatment at 20% for 3 minutes is preferably 85 to 100%. If the elastic modulus is less than 20 g / d, the fiber base cloth is no longer stretched and stiff, and the processability at the time of coating or laminating is deteriorated, and the handleability may be poor.
If it exceeds g / d, the rigidity of the fiber becomes large, and it is difficult to obtain the soft texture aimed at by the present invention in the case of synthetic leather. When the elastic recovery is less than 85%, especially when a woven or nonwoven fabric is used as the fiber base fabric, the peeling resistance during repeated expansion and contraction may be poor.

[0011] The single-denier and total denier of polytrimethylene terephthalate fiber can be appropriately selected depending on the use of the synthetic leather, the form of the fiber base fabric used, and the like, but are preferable in view of the strength of the leather. Total denier is 20-300d, single yarn denier is 0.1-5d
It is. The fiber base fabric used in the present invention is a woven fabric,
It is composed of at least one kind of knitted fabric, non-woven fabric, etc.
The basis weight is 50 to 200 g / m ^2, preferably 50 to 150 g.
/ M ² , and if it is less than 50 g / m ² , the strength is insufficient, and if it exceeds 200 g / m ² , the texture becomes hard. The synthetic leather of the present invention may be produced by either a wet method or a dry method. Here, the wet method means
A synthetic resin dissolved in a solvent at a predetermined concentration is coated on a knitted or woven fabric, and solidified in a coagulation bath containing a poor solvent and sponge-like many fine communication holes are formed in the resin layer, Thereafter, the product is subjected to a washing and drying process to obtain a product.

The dry method means that a synthetic resin dissolved at a predetermined concentration in a solvent is coated on a woven or knitted fabric by a known coating method, for example, knife-on-roll coating, roll-on-roll coating, or the like, and the resultant is dried. Or a method in which a resin is applied to a release paper by a known coating method and dried to form a skin layer. The release paper mentioned here includes silicone type, polypropylene type and the like, and the surface treatment shape also includes flat type, enamel type, mat type and emboss type, but in the present invention, it is not limited at all by this. Next, there is a laminating method in which a two-pack type polyurethane resin-based adhesive is applied onto the skin layer by the above-mentioned known coating method, bonded to a woven or knitted fabric by thermocompression bonding, and dried to obtain a product. The synthetic resin used in the present invention has an adhesive property with a woven or knitted fabric or a nonwoven fabric, and may be any as long as it forms a flexible film.
Acrylic resin, urethane resin, acrylic / vinyl chloride copolymer resin, acrylic / vinyl acetate copolymer resin and the like are used.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. The physical properties were evaluated by the following methods. (1) Softness: Measured according to JIS-1096 (45 ° cantilever method), and the larger the value, the harder the texture. (2) Peeling durability during repeated expansion and contraction: 200 mm x 50
The both ends of a synthetic leather sample having a size of 20 mm were repeatedly gripped with a gripping length of 20 mm by a stretching tester (De-Matcher) and repeatedly stretched 10% at a rate of 60 times / min. The number of occurrences was evaluated.

Example 1 A polytrimethylene terephthalate polymer was melt-spun to obtain a continuous multifilament of 75d / 36f. Using this filament,
Density 136 lines / inch, weft density 104 lines / inch
Woven into a plain weave, and woven into a fiber base cloth (80 g /
m ² ), and synthetic leather was manufactured in the following steps (1) to (8). (1) Water-repellent treatment of fiber base fabric The base fabric was immersed in the following aqueous solution, squeezed with a rubber roll to a squeezing ratio of 40%, and heat-treated at 150 ° C for 2 minutes. -Asahi Guard LS-317 1.8 parts (Fuso-based water repellent manufactured by Meisei Chemical Co., Ltd.)-Water 99.2 parts

(2) Application of Synthetic Resin The following composition was coated with a knife coater on one side of the fiber base fabric subjected to the water-repellent treatment in the above (1). The thickness of the synthetic resin film was 500 μm.・ Chrisbon 166 40 parts (Dai Nippon Ink Co., Ltd. one-component polyurethane) ・ Dimethylformamide 60 parts

(3) Wet coagulation After immersion in water at 30 ° C. for 5 minutes,
The solvent was removed for a minute. (4) Heat treatment Heat treatment was performed at 150 ° C. for 2 minutes using a pin tenter. (5) Manufacture of a skin layer The following polyurethane resin composition appropriately colored so as to have a thickness of 20 μm after drying is applied on a release paper having a desired pattern using a bar coater to form a skin layer. did.・ 1 part type polyurethane resin 100 parts ・ Methyl ethyl ketone 15 parts ・ Pigment 15 parts

(6) Adhesive layer The above skin layer has a thickness of 10 after drying using a bar coater.
The following polyurethane resin, which was appropriately colored so as to have a thickness of μm, was applied to form an adhesive layer, and then dried at 100 ° C. for 1 minute.・ 100 parts of two-pack type polyurethane resin ・ 15 parts of dimethylformamide ・ 15 parts of trifunctional aromatic isoposocyanate (7) Lamination of base layer and skin layer The above skin layer, adhesive layer and base layer are superimposed and heated at 100 ° C.
And pressed together with a hot roll (4 kg / cm ² ).

(8) Peeling of release paper After laminating the skin layer and the fiber base cloth at 40 ° C. for 24 hours, the release paper was peeled off to obtain the synthetic leather of the present invention. The results of evaluating the physical properties are as follows. 1) Bending resistance: 41 mm 2) Peeling durability when repeatedly stretched: Peeling occurs after 520 times

Comparative Example 1 Synthetic leather was produced in the same manner as in Example 1, except that 75d / 36f polyethylene terephthalate fiber was used. The physical properties of this synthetic leather were as follows. 1) Bending resistance: 53 mm 2) Peeling durability during repeated expansion / contraction: Peeling occurs 350 times

[0020]

As described above, the synthetic leather of the present invention is very soft and has excellent peeling durability even when used under conditions where it is subjected to repetitive stretching action. Synthetic leather suitable for sports clothing such as gloves and windbreakers.

Claims (1)

[Claims] 1. A synthetic leather comprising a fiber base fabric having a basis weight of 50 to 200 g / m ² and a synthetic resin coating layer formed on at least one surface thereof, wherein polytrimethylene terephthalate fiber is used as a fiber constituting the fiber base fabric. Synthetic leather characterized by use.