KR101408012B1 - Artificial Leather Using Non-urethane Resin - Google Patents

Abstract

The present invention provides a urethane artificial leather produced by impregnating (kneading) a knitted fabric with a high shrinkage solution, followed by shrinking at a high density so as to have an apparent density of 0.3 to 0.6 g / cm 3. The urethane artificial leather of the present invention can overcome the environmental problems considered in the use of urethane because artificial leather produced by high density shrinkage by chemical is removed by removing the urethane resin impregnation method used in artificial leather, It can be absorbed, wiped off, antibacterial, water repellent, etc. in addition to the touch of natural leather in addition to multifunctional knitted suede, and it is suitable for casual wear, high fashion and gloves, bags, , Various sporting goods shoes - dressing, casualization, sports, and the like.

Description

{Artificial Leather Using Non-urethane Resin}

The present invention relates to a high-density knitted fabric produced by shrinking a knitted fabric at a high density without impregnating a urethane resin, and an artificial leather including the knitted fabric.

Leather, or leather, has been used for protecting the body from the cold, and sometimes used as a container for storing alcohol and water. Leather has long durability, breathability, durability, long use, excellent texture and touch, and has been used for a long time as a preferred material of people's preference. The raw materials of leather are mainly obtained from animals such as cows, horses, sheep, snakes and crocodiles. However, due to the difficultness of processing, the price is high and for reasons such as animal protection and mass production, people make materials that can replace natural leather I have been working for a long time. In the early days, there was a "pseudo leather" which was made by applying a lacquer on a surface of a cloth, a nylon cotton lacquer, and pressing the surface of the cloth, as well as a "hard paper" As the plastic industry developed, synthetic leather surface appeared by processing film such as polyvinyl chloride. In the 1960s, a sponge leather was developed using a foamed vinyl chloride resin that compensated for the drawbacks of vinyl chloride leather. Subsequently, the sponge leather was coated with a soluble nylon resin (dry method) So that artificial leather having a natural leather texture can be produced much more than the conventional art. Around this time, US DuPont made polyamide-based (nylon) artificial leather by wet method, and this became familiar to the general public. In 1962, urethane-based artificial leather using urethane resin instead of nylon was marketed. Since then, most artificial leather has been manufactured by applying urethane resin to woven fabric, knitted fabric, nonwoven fabric and the like.

The manufacturing method of polyurethane artificial leather is mostly classified into a dry method and a wet method as a process using a solution type polyurethane resin (polyurethane-organic solvent solution). In the dry method, a film is formed by applying a one-component polyurethane resin to a release paper followed by drying in a heat chamber to evaporate the solvent, applying a two-component polyurethane resin on the formed film, and then bonding a fabric, a knitted fabric, It is a method of making artificial leather by bridging in the next room for a day. In addition, the wet method is a method in which a one-pack type polyurethane resin is applied to a backing material such as a fabric, a knitted fabric, a nonwoven fabric and the like, and then passed through water to extract an organic solvent, whereby a polyurethane resin is solidified to form a solid- It is the way to get. At this time, fine pores of fine cells are formed at the portion where the organic solvent has escaped.

 Although the manufacturing method of such polyurethane artificial leather is essentially an organic solvent in its process, the use of such an organic solvent causes environmental problems in the world. In addition, since the organic solvent is known as a carcinogen, it is harmful to the human body if it remains in the artificial leather as a final product. Therefore, researches on the production of artificial leather of artificial leather without solvent have been going on, but it is difficult to produce suitable raw materials, difficulty of the manufacturer due to rapid curing of raw materials, unevenness of the product, And so on.

As a patented technology in an effort to manufacture environmentally friendly artificial leather, Korean Patent Application No. 2005-0007693 entitled " Method for manufacturing artificial leather using water-dispersible urethane. &Quot; The patent is a method for producing artificial leather wherein water-dispersible urethane is impregnated, solidified in a microwave chamber, and hot-melted and bonded by heat and pressure. This makes it possible to produce artificial leather that is environmentally friendly without using an organic solvent by using the water-dispersible urethane. Another prior art is Korean Patent No. 10-0969041 entitled " Solventless polyurethane artificial leather having a living body texture and method for producing the same. &Quot; This patent has an effect of increasing the water absorption capacity and improving the emulsion properties by using a soybean protein isolate, improving heat resistance and mechanical properties, and using an organic solvent-free polyurethane resin.

Although the above-mentioned conventional patents are environmentally friendly, and are an excellent technology that tries to reduce the use of organic solvents, it is obvious that they do not exceed the limit of using urethane resin in the production of artificial leather. Also, in the case of conventional artificial leather manufacturing methods such as a method using silicon coating or impregnation of nonwoven fabric and a method of heat drying (nonwoven fabric) of nonwoven fabric have a difficulty in producing an apparent density similar to that of natural leather.

Numerous papers and patent documents are referenced and cited throughout this specification. The disclosures of the cited papers and patent documents are incorporated herein by reference in their entirety to better understand the state of the art to which the present invention pertains and the content of the present invention.

Conventionally, artificial leather is impregnated with a polyurethane resin to realize a feeling and physical properties similar to those of natural leather. However, the use of polyurethane has various problems that can cause environmental problems due to the organic solvents used together. When the organic solvent remains in the artificial leather as the final product, there is a problem that it is harmful to human body due to carcinogenic substances have. On the other hand, in order to reduce the use of organic solvents, studies on the production of artificial leather of artificial polyurethane are underway, but it is difficult to produce suitable raw materials, difficulty of manufacturing worker due to rapid curing of raw materials, It has not been put to practical use because of problems such as deterioration of the quality of the product compared with artificial leather.

Accordingly, the present invention provides a urethane artificial leather, which is produced by shrinking a urethane artificial leather, more preferably a knitted fabric, with a high shrinkage solution so as to have an apparent density of 0.3-0.6 g / cm 3 in an environmentally friendly artificial leather. The urethane artificial leather of the present invention can realize the physical properties and feel of natural leather without using urethane, and can further provide environmentally friendly artificial leather.

The present invention provides a urethane artificial leather produced by impregnating (kneading) a knitted fabric with a high shrinkage solution, followed by shrinking at a high density so as to have an apparent density of 0.3 to 0.6 g / cm 3.

The present inventors have made extensive efforts to produce an artificial leather having a feeling similar to that of natural leather without using a urethane resin. As a result, a urethane artificial leather having the above-mentioned merits has been completed. Through the process of impregnating a knitted fabric with a solution containing a high shrinkage agent and shrinking at a high density, an artificial leather having excellent tactile feel can be produced without using urethane Respectively.

According to one aspect of the present invention, there is provided a urethane artificial leather produced by impregnating a knitted fabric with a high shrinkage solution and shrinking the knitted fabric so as to have an apparent density of 0.3 to 0.6 g / cm 3.

The term " knitted fabric " of the present invention refers to a knitted fabric made by forming a loop in one direction in the weaving method, and preferably forming a knitted fabric with knitting and knitting , And more preferably a suede-like joining.

The term " high shrinkage " of the present invention means shrinking the stretch ratio of the knitted fabric in the transverse and longitudinal directions to be in the range of 30-50%, and may mean a process in which the apparent density of the knitted fabric is 0.3-0.6 g / have.

The term impregnation of the present invention may mean impregnating a gaseous or liquid material into an object, thereby improving the properties of the object depending on the purpose of use. Since the relevant field of the present invention is fiber, impregnation in this specification may mean penetrating the drug into the void space of the fiber structure to impart specific properties or properties to the fiber.

As used herein, the term " bulk density " generally refers to the density of a volume including a space other than an object in an object such as a powder, a granule, and a fibrous material existing in a space other than the object space. The fibers may be limited to a density of the volume including the space other than the fibers on the woven fiber.

Artificial leather, as used herein, is one of man-made leather made of synthetic fibers rather than natural leather, and unlike synthetic leather similar to natural leather, its structure is similar to that of leather May be used. It is a surface layer which is coated with a polyurethane resin with continuous pores corresponding to a fiber layer of an irregular three-dimensional three-dimensional structure and a grain layer of a leather. In addition to the two-layer structure of only the surface layer and the fiber layer, Some have a three-layered structure, and some have a suede-type surface layer covered with feathers. However, in the present invention, the term " urethane artificial leather " is specifically used to emphasize that the polyurethane resin is not used at all in the production of artificial leather.

According to a preferred embodiment of the present invention, the yarn of the knitted fabric may be any one of sea shafts or split yarns selected from the group consisting of polyester yarns, nylon yarns, PCP yarns and composite yarns thereof.

The term PCP in this specification refers to PET / Co-PET, which may mean a composite of polyester and Co-Polyeste. Here, Co-Polyester is similar to polyester but may be a component that is eluted by weight loss.

The term sea shoelace in the present specification means that the components constituting the yarn are composed of a portion which melts in the solvent and a portion which does not melt and the portion which melts in the solvent disappears and only the portion which does not melt in the solvent remains, Quot; fibers "). More preferably a microfiber or microfiber yarn manufactured for the purpose of maximizing advantages such as soft touch and better warmth, and more preferably, it is mainly manufactured for the purpose of producing artificial suede It can mean yarn.

The term "split yarn" as used herein means a fiber in which a plurality of yarns are produced from one yarn by the pressure of water or air, and the yarn is divided into fine yarn or ultra fine yarn Lt; / RTI >

According to a preferred embodiment of the present invention, the single strand fineness of the chart or partition yarn may be 0.001-0.5 Denier, more preferably 0.005-0.3 Denier, most preferably 0.01-0.2 Denier per filament (DPF) Can be Denier. In the present invention, the thickness of the yarn may be important. This is because it is difficult to realize artificial leather as a natural leather with a general thickness of yarn, so that artificial leather is made of ultra-fine or ultra-fine fibers. In the present specification, a yarn having a fineness of 0.001-0.5 Denier is defined as a microfiber or ultra microfiber constituting the knitted fabric. Since knit fabrics can be produced by microfiber or microfiber, soft knit can be realized. Therefore, it is possible to manufacture an artificial leather having the feel of natural leather and it is advantageous to increase the density of the weaving structure of the fabric. It may be important to use microfibers or microfibers as well.

According to a preferred embodiment of the present invention, the yarn of the knitted fabric may further include blended with carbon fiber or silver yarn, and may be subjected to a scouring process, a weight reduction process, napping, raising) process, and a mixing process thereof. In the present invention, when the microfiber or ultra-fine fiber is blended with carbon fiber or silver powder, it is possible to produce a suede excellent in softness, hygroscopicity, adsorptivity and cutoff of static electricity at the origin, and can produce a product such as a cleaner . Further, the present invention can be pre-treated with one process selected from the group consisting of refining, weight loss, brushed, and mixing thereof. Preferably, the refining and the weight reduction can be simultaneously performed. More preferably, Step < / RTI >

The term refining of the present specification may mean impurities originally possessed by the fibers, or a process of removing a paste or an oil added in a spinning, weaving, or knitting process.

The term "weight reduction" as used herein refers to a processing method which is mainly applied to a polyester fabric, in which the surface of the fiber is hydrolyzed by treatment with caustic soda (NaOH), resulting in irregular and fine irregularities on the surface, . In the present invention, since artificial leather excellent in tactile feel is provided, it may be important that weight reduction processing is included in the pretreatment.

The term " bristle " in the present specification may mean a processing method in which a feather is scraped from the surface of a knitted fabric, and a processing method is carried out in order to give a soft touch and a visual feel. In the present specification, it may be important to include brushed processing in the pretreatment process. This is because, if fine napping occurs on the surface through brushed processing, it is possible to realize a feeling of soft natural leather.

According to a preferred embodiment of the present invention, the high-shrinkage solution may contain at least one selected from the group consisting of benzyl alcohol, dipentene, and benzoic acid as a shrinking agent, Preferably two or more members selected from the group consisting of benzyl alcohol, dipentene, and benzoic acid may be included as the shrinking agent, and most preferably benzyl alcohol, Dipentene, and benzoic acid may all be included as shrinking agents. It may be possible to selectively contain benzyl alcohol, dipentene or benzoic acid. However, when it is used in combination with one or more than two selected, It can happen effectively.

According to a preferred embodiment of the present invention, the high-shrinkage solution contains polyethylene glycol, sorbitan monostearate, turkey red oil, and fatty alcohol sulfate (Fatty alcohol sulfate), and most preferably all of them may be included. In particular, when included in all, in a preferred use of each component, the polyethylene glycol may function as a volatile preservative and the sorbitan monostearate may serve as an emulsifier, Alcohol sulfates can function as penetrants. Although at least one of the components other than the above-mentioned water-shrinking agents may be additionally contained in the high-shrinkage solution, when the shrinkage solution is used in accordance with each application, the contraction of the density to be achieved in the present invention more effectively occurs .

According to a preferred embodiment of the present invention, the high-shrinkage solution contains 10-30% of the solid content of the drug in relation to the weight of water, and benzyl alcohol may be contained in an amount of 20-80% based on the total weight of the solid. In the present invention, the content of the drug contained in the high shrinkage solution can be very important. Because it is the action of the high shrinkage solution that can produce artificial leather similar to the tactile and physical properties of natural leather without the use of a urethane resin, since the shrinkage rate can vary depending on the content of the drug contained in the high shrinkage solution to be. The knitted fabric made of microfine or microfine yarn according to the above drug content can be further shrunk to a higher density, and as a result, the artificial leather produced is much closer to natural leather than the artificial leather produced by impregnating urethane . Therefore, in the present invention, since the chemical is a direct component which can shrink the knitted fabric to an apparent density of 0.3-0.6 g / cm 3 and manufacture artificial leather without using urethane resin, the content of the chemical is very important in the present invention Lt; / RTI >

According to a preferred embodiment of the present invention, the impregnation is performed under conditions of a mangle pressure of 0.1-5.0 kgf and a pick up rate of 50-150%, more preferably a mangle pressure of 0.5-4.0 kgf And a pick up rate of 90-120%, and most preferably a mangle pressure of 1.0-3.0 kgf and a pick up rate of 100-110%. However, the present invention is not limited thereto, and the above conditions can be selected flexibly to shrink the apparent density of the knitted fabric to the range of 0.3-0.6 g / cm3.

The term " mangle " as used herein means a machine including a roller for squeezing a solution, which may mean that the dyestuff contained in the treatment liquid is used to uniformly press-impregnate the fabric with the dyestuff.

According to a preferred embodiment of the present invention, the shrinkage can be carried out at a temperature condition of 30-100 DEG C and a pressure condition of 1.0-2.5 kgf for 10-50 minutes, more preferably a temperature condition of 50-80 DEG C and a pressure condition of 1.5-2.0 kgf for 20-40 minutes and most preferably for 30 minutes at a temperature condition of 60 DEG C and a pressure condition of 1.8 kgf. However, the present invention is not limited thereto, and the above conditions can be selected flexibly to shrink the apparent density of the knitted fabric to the range of 0.3-0.6 g / cm3.

According to yet another aspect of the present invention, the present invention provides a urethane artificial leather comprising the following characteristics:

(a) Density (apparent density): 0.3-0.6 g / cm 3;

(b) Daylight fastness: 4-5 grade;

(c) breaking strength: 60-90 kg / 25 mm;

(d) Thickness: 0.5-3.0 mm;

(e) breathability: 15-25 cm3 / sec;

(f) Fineness: 0.05-0.3 denier; And

(g) Dispersion ratio: 70-100%.

In the present invention, it can be very important that the bulk density is 0.3-0.6 g / cm3. Because the artificial leather has the physical properties and texture of natural leather in the range of apparent density 0.3-0.6 g / cm3, the present invention can be densified to be higher than 4.2 g / cm3, Because it can be manufactured. Therefore, the reason why the present invention can be implemented without impregnating urethane resin with excellent tactile feeling near natural leather is that the apparent density is made to be 0.3-0.6 g / cm 3, so that the apparent density constitutes the urethane artificial leather of the present invention It can be the most important property of the property.

The term division ratio in the present specification means the degree of division after weight reduction of chart and division yarns. The larger the numerical value is, the smaller the thickness is, the more soft touch can be exhibited.

In addition, the description of the urethane artificial leather can be generally interpreted by those skilled in the art, and omitted in view of redundancy and excessive complexity of the description herein.

The features and advantages of the present invention are summarized as follows:

(a) The present invention provides a urethane artificial leather produced by impregnating (kneading) a knitted fabric with a high shrinkage solution and shrinking the knitted fabric so as to have an apparent density of 0.3 to 0.6 g / cm 3.

(b) The present invention overcomes the environmental problems considered in the use of urethane because artificial leather made in a new direction is provided by removing the urethane resin impregnation method used in artificial leather.

(c) Since the present invention realizes high-density artificial leather, it is possible to obtain a feeling of touch closer to natural leather.

(d) The high-shrinkage and high-density knitted fabric according to the present invention is excellent in absorbency and scrubbing property due to its surface area, and also has excellent properties such as antibacterial and water repellency.

(e) The high-shrinkage and high-density knitted fabric according to the present invention can be developed as a multifunctional knit suede such as a clean cleaner which shields static electricity from the beginning and has excellent antistatic property and conductivity and hardly scratches. And

(f) The present invention is based on the excellent stretchability, and it can be applied to a suit, a jacket, a coat, an outwear, a casual wear, a high fashion and gloves, a bag, a hat, It can be applied to sports and the like.

BRIEF DESCRIPTION OF THE DRAWINGS Fig.
FIG. 2 is a photograph before and after the microfibrillator shrinkage that occurs during the weight reduction of the pretreatment of the present invention.
Fig. 3 shows a comparative photograph before and after the knitted fabric of the present invention is shrunk at a high density by a high shrinkage agent.
Figure 4 shows a continuous high density shrink system for making a urethane high density knitted fabric included in an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood that the scope of the present invention is not limited by these examples in accordance with the gist of the present invention, and it is to be understood by those skilled in the art that the present invention is not limited thereto It will be obvious.

Example

Example  1: Leather For backing  Fabric preparation process

(PET), nylon (Nylon), PCP (PET / Co-PET) and the like, which have single yarn fineness of 0.3 to 0.05 denier And a composite yarn may be selected from among the charts and the divisions. In the embodiment of the present invention, PCP 80D (domestic Huvis and 50D PCP of 30% polyester of SHINKONG SYNTHETIC FIBERS CORPORATION, Taiwan) was selected as a yarn, and the single yarn fineness of the split yarn was divided into DPF denier per filament) 0.185D. The selected yarn was woven in an interlocking structure using a circular knitting machine 42G (Maya, Germany) to prepare a fabric for backing leather.

Example 2: Scouring, Reduction and Brushing Process

(SC-700; World Chemical Co., Ltd., BK-500; white light industry), 0.1 to 1.0% (ows) of a scouring agent (d) a dewatering agent (SC-1000; world chemistry, SEQ-T; entecrosoria, oligomer; impurities, anti-redeposition agent SG-45; World Chemical), and 0.5 to 3.0% (ows) Soda (NaOH) (Wonil Chemical Co., Ltd., Daejung Chemical Co.) were mixed and pretreated at 80-100 ° C for about 10 to 40 minutes. At this time, NaOH was added so as to be accompanied with scouring and alkali weight reduction processing, and in the pretreatment step, it was noted that the temperature may be different from the pretreatment agent depending on the microfiber manufacturer, twisting water, texture and weaving condition.

After the scouring and weight reduction, the fabric is put into a bristle machine (NAPPING MACHINE RPM; 500-1,500, times: 4-18 times) to artificially brushed ). It is noted that the bristle length can be varied depending on the application since the bristle processing can determine the texture after this.

Example 3: Low temperature high density shrinkage process by high density shrinkage chemicals

Work was performed to densely shrink the treated fabric according to Examples 1 and 2. The machine used here is a continuous low-temperature high-density systolic reactor consisting of an inlet, a pre-washer tank, a chemical tank, a holding tank (shrinking and shrinking chambers), a water tank, an ultrasonic water tank, and a plating tank. It is advantageous in that the density is not lowered due to tension or elution, so that it is a device specially selected and manufactured by the present invention. Prior to the introduction of the fabric, the chemical tank of the chemical tank was previously mixed with the same ratio as shown in Table 1 below, and diluted with water to a solid content of 10 to 30% relative to water.

The fabrics treated in Examples 1 and 2 were placed in a sagging state in an expanded state and washed in a pre-washer bath to prevent creasing. During the washing process, when the fabric passes through the chemical tank, the pressure of the mangle is 2.5 kgf, and the chemicals are allowed to penetrate into the fabric with a 100% pick up rate. In the retention tank in which the density of the next fabric can be determined, the fabric was allowed to stand for 30 minutes at a temperature of 60 ° C and a pressure of 1.8 kgf.

Usage ingredient content (%) Festival Benzyl alcohol 20-80 dipentene 5-30 benzoic acid 5-30 Preservative polyethylene glycol 1-5 Emulsifier sorbitan monostearate 1-5 turkey redoil 3-10 Penetration agent fatty alcohol sulfate 0.1-2 tidecyl 0.1-2 Reforming agent polyglycol diglycidyl ether 0.2-2 Emulsifying neutralizing agent ethylamine 0.2-2 alkyl etherphosphate 0.2-2 Dispersant alkyl benzene sulfonate 0.2-2

Example  4: washing process including ultrasonic washing and Plating

The densely contracted fabric was passed through four residence tanks. Ultrasonic devices were installed in at least one water tank, and fine particles could be removed. Each water tank was connected to a conveyor system so that the tension applied to the fabric could be minimized. After the washing process, the fabric was returned to the plating tank in a fully expanded state.

Example  5: Dyeing and Post-processing  fair

As a final step, dyeing and post-processing were performed to make the surface texture (visual tactile impression) of the dense shrunk fabric similar to artificial leather. Dyeing was performed with acid dye of pH 4-5 at a bath ratio of 1: 10-1: 30. The dyeing conditions were treated at 120-130 ° C for 40-100 minutes, and the drugs used for dyeing were as shown in Table 2 below.

medicine Usage content BLACK AMP (Daeyoung Industry) Disperse dye 15% (o.w.f) Baritol (Chemistry World) Penetration agent 1-3% (o.w.s) disper N-3 (Daeyoung Trading) Micro-dispersant 0.1-1% (o.w.s) disper VG-1000 (Daeyoung Trading) Dispersant for leveling agent 0.1-1% (o.w.s) SG-45 (World Chemistry) An anti-redeposition agent 0.5-3% (o.w.s) Acetic acid or citric acid pH adjusting agent 0.5-3% (o.w.s)

In dyeing, acid dyes are generally used with disperse dyes, and dyes have to be sorted according to solvent resistance, light fastness and wash fastness. After the dyeing, the unfixed dye was removed by R / C (Reduction Clearing) and washing with water. Next, the high-density shrinkable knitted fabric was subjected to post-processing (150 to 180 ° C × 30 m / min) by drying and heat treatment.

Experimental Example  1: Physical properties of artificial leather

The physical properties of the artificial leather produced according to Examples 1 to 5 of the present invention were measured as follows and the results are shown in Table 3 below.

Density : Weight and thickness were measured in the same size around high density and density was measured according to KS K0521 test standard. When the density is more than 0.4 g / ㎤, it can be expected to have a touch and characteristics similar to those of natural leather. Therefore, it takes a large portion of the quality and has a mechanical limit.

Daylight fastness : To determine the degree of change of color due to sunlight , we measured the weatherability by adjusting artificial light, heat and humidity, and it was measured according to KS K105B02 test standard.

Cutting strength : The force applied when the fabric is ruptured. Three test specimens with a width of 100 mm and a length of 100 mm were measured and measured according to the KS K 0520 test standard using a MULLEN cut strength tester.

Thickness : Measured according to KS K 0506 test standard. Usage varies depending on thickness. For 1.2 or more, CAR-SEAT 0.8 or less is used for automobile interior use. Thinner is used for clothing, and there is a correlation between touch and density.

Air permeability : measured according to MS257-13 test standard. It refers to the degree of air permeability of textile products and it is a test to measure the amount of air passing. The degree of air permeability affects sanitary properties such as warmth, waterproofness, and moisture resistance, and is closely related to comfort.

Fineness (denier): was measured using a microscope and Warp reel.

Splitting ratio : A measure for determining the degree of splitting of split yarn and chart yarn, was measured using an electron microscope. The higher the disintegration rate, the more fine fibers were possible, and the soft touch could be exhibited.

Evaluation items Measures Density (g / cm3) 0.42 Light fastness (grade) 4-5 Cutting strength (kg / 25mm) 60-150 Thickness (mm) 1.2 Air permeability (cm3 / sec) 20 The denier 0.2 Decomposition rate (%) 90

Experimental Example  2: Preference experiment

The sofa sheet was manufactured using the artificial leather manufactured according to the first to fifth embodiments of the present invention, and the feeling and the preference of the users were examined. The comparison subjects were a sheet made of 100% natural leather (control 1) and a synthetic leather made of urethane impregnated (control 2). The participants in this experiment were 50 people in their 20s and 30s, and did not provide any information about the material of the sofa sheets to the participants. Table 4 shows the results of comparing the feel of each leather sheet with the visual feel of the sofa sheet and investigating the preference.

Evaluation items Control 1
(Natural leather) Control group 2
(urethane Impregnation  Synthetic Leather) Invention
(Urethane high density synthetic leather) Sensitivity 45 people 14 people 41 people Visual impression 48 people 15 people 37 people

As described above, the urethane-impregnated synthetic leather has a low degree of preference, while the urethane high density synthetic leather of the present invention is as preferable as the natural leather. As a result, it was proved that the present invention can provide a feel and visual feeling close to that of natural leather, which is difficult to distinguish from natural leather.

Claims (10)

A urethane artificial leather produced by impregnating a knitted fabric with a high shrinkage solution and shrinking the knitted fabric so as to have an apparent density of 0.3 to 0.6 g / cm 3.
The method according to claim 1,
Wherein the yarn of the knitted fabric is a grid or yarn spun by at least one polymer material selected from the group consisting of polyester, nylon, PCP (Polyester / Co-Polyester), and nylon / polyester Urethane artificial leather.
3. The method of claim 2,
Wherein the monofilament fineness of the chart or partition yarn is 0.001-0.5 Denier of DPF (denier per filament).
3. The method according to claim 1 or 2,
The yarn of the knitted fabric may further be blended with carbon fiber or silver yarn, and the knitted fabric includes a scouring process, a weight reduction process, and a napping process. Treated with at least one process selected from the group consisting of the following.
The method according to claim 1,
Wherein the high shrinkage solution contains at least one selected from the group consisting of benzyl alcohol, dipentene, and benzoic acid as a shrinking agent.
6. The method of claim 5,
The high shrinkage solution contains polyethylene glycol, sorbitan monostearate, turkey red oil, and fatty alcohol sulfate as components other than the above-mentioned water-swelling agent. And at least one selected from the group consisting of polyurethane and polyurethane.
The method according to claim 5 or 6,
Wherein the high shrinkage solution contains 10-30% of the solid content of the drug relative to the weight of water, and includes benzyl alcohol in an amount of 20-80% of the total solid weight of the drug.
The method according to claim 1,
Wherein the impregnation is performed under conditions of a mangle pressure of 0.1-5.0 kgf and a pick up rate of 50-150%.
The method according to claim 1,
Wherein the shrinkage is carried out at a temperature of 30-100 DEG C and a pressure of 1.0-2.5 kgf for 10-50 minutes.
Urethane artificial leather including the following characteristics;
(a) Density (apparent density): 0.3-0.6 g / cm 3;
(b) Daylight fastness: 4-5 grade;
(c) breaking strength: 60-90 kg / 25 mm;
(d) Thickness: 0.5-3.0 mm;
(e) breathability: 15-25 cm3 / sec;
(f) Fineness: 0.05-0.3 denier; And
(g) Dispersion ratio: 70-100%.

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