KR960004686B1 - Method of producing artficial leather - Google Patents

Abstract

The artificial leather is produced by (a) composite or blend spinning a nylon-6 or a polyethylene terephthalate as an island component, and a polyethylene, a polystyrene or a polyester as a sea component to obtain a sea/island type composite fiber, (b) drawing and winding the fiber to obtain a stable fiber, and carding, cross lapping and needle punching it to obtain an interlaced nonwoven fabric, (c) padding the nonwoven fabric with a mixed solution of 3˜20wt.% water soluble polymer and 1˜5wt.% softener, and drying it, and (d) dipping the fabric into a dimethyl formamide(DMF) solution dissolved with a polyurethane, removing the DMF, the sea component and the water soluble polymer, and dyeing and bupping it. The softener is pref. water soluble silicon, amino-modified silicon, alkyl amide deriv. or vinyl acetate polymer.

Description

Manufacturing method of artificial skin with excellent flexibility

The present invention relates to a method of manufacturing artificial leather having excellent flexibility, and more particularly, adding a water-soluble polymer and a softening agent to an island-in-the-sea composite fiber formed by complex spinning two or more kinds of polymer materials having different solubility with respect to an alkali solvent. After dissolving the water, the sea component of the composite fiber and the water-soluble polymer surrounding the exterior of the composite fiber are removed to form voids between the fiber and the polymer elastomer, which can be widely used in clothing, gloves, balls, sports shoes, and sundries. The present invention relates to a method of manufacturing artificial leather having excellent flexibility and resilience similar to natural leather.

In order to manufacture artificial leather with excellent flexibility, a method of manufacturing artificial leather with excellent flexibility by forming a web using polyester with high shrinkage rate and shrinking with hot water sufficiently and then impregnating a polymer elastic body (Japanese Patent Application) 49-80202), a method of imparting flexibility by filling porous polyurethane elastomers in the space of a fiber assembly made of fine fibers (Japanese Patent Application Laid-Open No. 50-42004), a polymer in a leather material composed of a fiber assembly and a polymer elastomer A method of treating a softening agent compatible with an elastomer (Japanese Patent Laid-Open No. 53-24006), a method for adjusting the misleading and solvent concentration of a polymer elastomer coagulation bath (Japanese Patent Laid-Open No. 52-864), and a hydrophobic polyurethane in a fiber assembly. A method of forming a stable porous polyurea structure having a porous structure by adding a coagulation regulator when impregnating ten (Japanese Patent Laid-Open No. 1-132885), etc. Although it has been suggested that the polymer elastic body is filled without adding a water-soluble polymer such as polyvinyl alcohol to the composite fiber, the fiber and the polymer elasticity are in close contact with each other or lack of voids, resulting in a decrease in flexibility and a high resilience. When water-soluble polymers such as polyvinyl alcohol are added to the composite fiber aggregates, when treated with a high concentration of solution to increase the adhesion amount, the composite fiber aggregates have a high degree of hardening, which makes the winding work difficult and poor surface smoothness. There was a downside.

Accordingly, an object of the present invention is to provide a method for producing artificial leather having excellent flexibility and resilience similar to natural leather.

In order to achieve the above object as well as another object easily expressed in the present invention by treating the mixture of the water-soluble polymer and the softening agent to the island-in-the-sea composite fiber, the water-soluble polymer and the softening agent is sufficiently added to the outside of the composite fiber and then porous to the outside. After filling the polymer elastomer having a structure, a large amount of pores are formed between the fiber and the polymer elastomer by removing the sea component of the composite fiber and the water-soluble polymer outside the composite fiber in the alkyl solution.

Treatment with a mixture of a water-soluble polymer and a softening agent increases the amount of softening agent and prevents hardening of the island-in-the-sea composite fiber, and also forms voids between the fiber and the polymer elastomer to provide excellent flexibility and resilience. Similar artificial leather can be produced.

The present invention will be described in more detail as follows.

Polyethylene glycol, 2-ethylhexyl acrylate, adipic acid, or dimethyl sulfoisophthalate to form continuous filaments with fiber-forming polymer such as nylon-6 or polyethylene terephthalate Polyethylene, polystyrene, or polyester modified by copolymerizing with one compound selected from the group consisting of, etc. through a spinneret device that can arbitrarily control the number of spinnerets, by complex spinning or blending spinning the polymer of the island component in the longitudinal fibrous form To prepare the island-in-the-sea composite fiber present. The prepared island-in-the-sea composite fiber is made through a normal drawing process and a crimping process to make staple fibers, carded, cross-wrapped, and needle punched to prepare a three-dimensional entangled nonwoven fabric and shrink in hot water, followed by water-soluble polymer 3 ~ 20. 10-50 parts are padded and dried with respect to 100 parts of fiber by the mixed aqueous solution or emulsion of 1 weight% and the softener 1-5 weight%.

The water-soluble polymer may be a mixture of one or two or more selected from the group consisting of polyvinyl alcohol, starch, carboxymethyl cellulose, vinyl acetate polymer or copolymers thereof, and the softener may be water-soluble silicone, amino-modified silicone, alkyl. Mixtures of one or two or more selected from the group consisting of amide derivatives, aliphatic amide derivatives, polyhydric alcohol aliphatic ester polymers, copolymers thereof and the like can be used.

The concentration of the water-soluble polymer is preferably 3 to 20% by weight, more preferably 5 to 15% by weight. If it is less than 3% by weight, the voids between the fiber and the polymer elastomer are insufficient and thus the flexibility is insufficient. Not only is it difficult to prepare the aqueous polymer solution, but even if the viscosity is high, it is not sufficiently impregnated into the composite fiber. The concentration of the softening agent is 1 to 5% by weight, more preferably 2 to 4% by weight, but less than 1% by weight of the island is less effective in reducing the degree of curing of islands-in-the-sea composite islands, when it exceeds 5% by weight It may also cause problems such as a decrease in color fastness.

When the mixed aqueous solution or emulsion of the water-soluble polymer and the softener is filled into the composite fiber, 10 to 50 parts of the fiber is more preferably 10 to 50 parts, more preferably 20 to 40 parts, but less than 10 parts is insufficient in flexibility and more than 50 parts is economical. Can not do it.

Bubbles treated with a mixture of water-soluble polymers and softeners or emulsions are hot-air-dried and compressed at regular intervals under heated pressure to produce bubbles with excellent flexibility, form stability, and surface smoothness.

Wet foam impregnated with a polyurethane elastomer for wet impregnation in a suitable viscosity in dimethylformamide, and then solidified in water at room temperature for 10 minutes, completely washed with dimethylformamide as a solvent in hot water at 50 ℃ to remove the sea component In order to remove the sea component and the water-soluble polymer completely or simultaneously in a suitable solution, the fibers can be miniaturized, voids are formed between the fibers and the polymer elastomer, and the surface wool is buffed by sand paper to smoothly distribute the soft wool and provide flexibility. This excellent suede-like artificial leather is manufactured. As another method, after laminating the polyurethane film for the surface layer on the bubble, or wet coating the polyurethane for the microporous layer and laminating the surface layer, the sea component and the water-soluble polymer are removed to have excellent flexibility and semi-platelet nature leather Manufactures artificial leather similar to

The following examples and comparative examples further illustrate the invention but do not limit the scope of the invention.

Example 1

40 parts of a soluble polyester obtained by copolymerizing dimethyl sulfoisophthalate with 12 mol% of terephthalic acid as a sea component and 60 parts of a conventional fiber-forming polyethylene terephthalate as a island component were spun with a composite fiber spinneret with 36 spinning airborne fines. Denier, short fibers of length 51mm were prepared. The nonwoven fabric having a three-dimensional entangled structure having a weight of 200 g / m 2 and a thickness of 1.0 mm was formed by carding, cross-lapping, and needle punching by a conventional method, and then contracted in boiling water to produce a non-woven fabric having an apparent density of 0.25 g / cm 3.

The non-woven fabric was padded with 10 parts by weight of polyvinyl alcohol and 3 parts by weight of an amino-modified silicone softener (sillicon AM-723, manufactured by Korea Precision Co., Ltd.) with an added amount of 26 parts per 100 parts of fiber, dried, and the roll surface temperature was 140 Compression was carried out with an appropriate interval of degrees Celsius. After impregnating the dimethylformamide solution in which the polyurethane was dissolved, the solution was solidified in normal temperature water and washed with dimethylformamide as a solvent in hot water at 50 ° C. to obtain a fiber: polyurethane ratio of 7: 3. This was treated with a 5% NaOH aqueous solution having a temperature of 90-95 ° C. to completely remove the sea component and polyvinyl alcohol, thereby minimizing the fibers, dyeing, and buffing to prepare artificial leather of Swezo.

Manufactured artificial leather was evaluated by the person skilled in the art to evaluate the overall touch, the drape coefficient, the lecture and the degree of opening are shown in Table 1 the results.

Example 2

40 parts of a soluble polyester obtained by copolymerizing 8 mol% of dimethyl sulfoisophthalate with terephthala as a sea component and 60 parts of ordinary fiber-forming nylon-6 as a island component with a composite fiber spinneret of 36 Except for the same as in Example 1 except for the evaluation of the physical properties of the artificial leather produced are shown in Table 1 the results.

Example 3

Spinning and blending 45 parts of polyethylene containing 8 mol% 2-ethylhexyl acrylate as a sea component and 55 parts of nylon-6 as a island component, and adjusting nylon 6 to form 400 to 500 longitudinal fibers in polyethylene. The same procedure as in Example 1 was carried out except that the composite fiber was prepared by mixing and spinning, and the sea component and polyvinyl alcohol were removed using toluene and boiling water, respectively. The results are shown in Table 1.

Example 4

Except for wet coating a dimethylformamide solution in which polyurethane is dissolved to form a microporous layer having a thickness of 40 μm and laminating the surface layer, the same procedure as in Example 3 was carried out, and the physical properties of the manufactured artificial leather were evaluated. The results are shown in Table 1.

[Comparative Examples 1-4]

Except for not treating the mixed aqueous solution of polyvinyl alcohol and softening agent was carried out in the same manner as in Examples 1 to 4, respectively, and the physical properties of the manufactured artificial leather was evaluated and the results are shown in Table 1.

※ Property Evaluation Method

1.Draped Factor: KS K 0815

2. Lecture degree: KS K 0539 (ContiLeva method)

3. Opening degree: Monsanto method

4. Touch: sensory evaluation

Claims (3)

In the web of the island-in-the-sea composite fiber composed of two or more polymers having different solubilities, the web is padded with a water-soluble polymer and filled with a polymer elastomer, and then removed from the sea component and the water-soluble polymer of the composite fiber. After padding with an emulsion mixture of one or two or more softeners and water-soluble polymers selected from the group consisting of amide derivatives, aliphatic amide derivatives, polyhydric alcohol aliphatic ester polymers or copolymers thereof, the polymer elastomer is filled and subjected to alkali processing. A method of manufacturing artificial leather, characterized by removing the sea component and water-soluble polymer of the composite fiber. The method of claim 1, wherein the emulsion is a manufacturing method of artificial leather, characterized in that consisting of 1 to 5% by weight of the softener and 3 to 20% by weight of the water-soluble polymer. The method of manufacturing artificial leather according to claim 1, wherein the emulsion is padded at 10 to 50 parts with respect to 100 parts of the composite fiber.