JPS5928671B2 - Method for manufacturing porous sheet material with good scratch resistance - Google Patents

Description

Detailed Description of the Invention The present invention uses a fibrous base material and a polymer mainly composed of polyurethane elastomer or polyvinyl chloride to create a porous material that has good scratch resistance and good wrinkle resistance, texture, moisture permeability, and flexural fatigue strength. The present invention relates to a method for manufacturing quality sheet materials.

Conventionally, porous sheet materials have been extremely suitable as leather substitutes due to their good texture, folding wrinkles, moisture permeability, and bending fatigue strength, and are widely used in shoes, clothing, bags, interior materials, etc. .

However, since most of the coating layer of such sheet materials has a porous structure, they have a major drawback in that they are easily damaged by abrasion or impact during use. In order to improve this drawback, conventional methods have been to reduce the size of the sponge during hole formation, apply stronger pressure than necessary with a heating roll after hole formation, crush the sponge by processing it in a heating chamber, or coat the sponge on the porous coating layer. Methods such as increasing the thickness of the non-porous colored layer and increasing its hardness have been used. However, all of these methods not only make the texture harder, but also have the fatal disadvantage of significantly worsening flexural fatigue strength, moisture permeability, and folding wrinkles, so it depends on the purpose of use. The reality was that we had no choice but to make sacrifices. Therefore, it has been the mission of those concerned to find a method that has good scratch resistance, civil feel, flexural fatigue strength, moisture permeability, and wrinkle resistance, and has been a major challenge.
The present invention was discovered as a result of intensive research to achieve this objective.

In other words, the present invention provides cross-linked silicone,
Fatty acid amide, higher fatty acid, higher alcohol, higher fatty acid ester, higher hydrocarbon, metal soap, modified nylon,
A substance selected from the group consisting of polyamino acid resins that becomes solid at room temperature or becomes solid upon heat treatment, and that lowers the coefficient of friction (hereinafter abbreviated as friction coefficient lowering agent)
This is a new method for producing a sheet material with good scratch resistance, which involves applying a layer of 0.01 to 10 microns (hereinafter referred to as an intermediate layer) with a thickness of 0.01 to 10 microns, followed by coloring and stamping. Through the present invention, for the first time, it has become possible to obtain a porous sheet material that has good scratch resistance, wrinkle resistance, texture, moisture permeability, and bending fatigue strength. The materials used for the porous coating layer in the present invention include polyvinyl chloride or polyurethane elastomer, and the colored layer includes a mixture of lacquer, acrylic resin, etc., and pigments or dyes in addition to the above-mentioned polymers. The friction coefficient reducing agent added between the porous coating layer and the colored layer, which plays an extremely important role in the present invention, includes crosslinked silicone, fatty acid amide, higher fatty acid, higher alcohol, higher fatty acid ester, higher hydrocarbon, metal. There are soaps, modified nylons, and polyamino acid resins, all of which are solid at room temperature or at fairly high temperatures, or need to become solid after heat treatment.

Otherwise, during the production or use of porous sheet materials, these will migrate to the colored layer, i.e., the surface, resulting in a fatal disadvantage of significantly deteriorating the appearance, strength, and texture of the product. . These friction coefficient reducing agents can be used after being melted with heat or dissolved or dispersed in a suitable solvent. If the amount of the friction coefficient lowering agent applied is too small, it will not have the effect of improving scratch resistance, and if it is too large, the flexural fatigue strength will deteriorate or the adhesion between the porous coating layer and the colored layer will be inhibited. The thickness is about .01 micron to 10 micron, preferably 0.05 micron to 5 micron. Mixing a friction coefficient lowering agent into the colored layer or applying it to the surface of the colored layer may be useful for improving scratch resistance, but it may interfere with stamping or coloring and only impair the appearance of the product. However, it is not preferable because the adhesion and texture (feel) deteriorate significantly. The present invention will be specifically described below with reference to Examples.

Note that all percentages in the text relate to weight. Example 1 A nonwoven fabric of nylon fibers was impregnated with a dimethylformamide solution of an ester polyurethane elastomer having a concentration of 20%, and on top of this a dimethylformamide solution of the same type of polyurethane elastomer having a concentration of 12% was impregnated with a solid content of 8%.
Apply 0g/M2, dimethylformamide/water = 2
/3 in a coagulation bath with a temperature of 40°C.
After treating for 0 minutes, the solvent was removed and dried to produce a porous base fabric.

The impregnated nonwoven fabric layer was then sliced to a thickness of 1.5W1, and 10% crosslinked silicone was applied to the surface of this porous coating layer.
After applying 39/M2 solution consisting of 90% trichlorethylene and heat-treating it at 135°C for 3 minutes, ether polyurethane 7C! ), a solution containing 3% brown dye and a solvent consisting of dimethylformamide, cyclohexanone, and tetrahydrofuran was applied at a solid content of 39/M2,
Furthermore, porous sheet materials were manufactured by stamping and staking (4). This material was suitable as a material for women's shoes because it had good scratch resistance, good wrinkle resistance, good color development, and good texture. On the other hand, a porous sheet material was produced in exactly the same manner as above except that the coating layer of crosslinked silicone was not provided (B). Although this material had good creases and texture, it had poor scratch resistance and was unsuitable as a material for shoes. Example 2 A porous film made of ether polyurethane elastomer with a thickness of 0.4R was laminated on a woven fabric of polyester fibers, and then the Young's modulus of the dry film was 5K7.
/m modified nylon (N-methoxymethylated nylon) 9%, citric acid 0.5%, methanol 69.5%,
After applying a solution consisting of 21% water in a solid content of 69/M2, heat treatment at 130°C for 5 minutes, applying the same amount of the same coloring solution as in Example 1, and then stamping and staking. This material had excellent scratch resistance and was suitable for interior materials and clothing materials.

On the other hand, a porous sheet material 0)L was produced in exactly the same manner as described above except that only the intermediate layer of modified nylon was omitted, and this material had poor scratch resistance and low commercial value.

Example 3 A porous material with a thickness of 0.6 mm made of polyvinyl chloride containing a plasticizer and a base material created by impregnating a polyester-based polyurethane elastomer into a nonwoven fabric of polyester fibers, performing wet coagulation, solvent removal, and drying. A porous sheet material was produced by laminating the film, applying zinc stearate in a ratio of 19/M2, and then applying a polyamino acid resin in a ratio of 29/M2 thereon, followed by stamping and dyeing.

Claims (1)

[Claims] 1. When forming a porous sheet material by stamping and forming a colored layer on a fibrous base material having a porous coating layer made of a polymer mainly composed of polyurethane elastomer or polyvinyl chloride, the porous coating layer and the coloring layer are formed. Between the layers, a material selected from the group consisting of crosslinked silicone, fatty acid amide, higher fatty acid, higher alcohol, higher fatty acid ester, higher hydrocarbon, metal soap, modified nylon, and polyamino acid resin is solid at room temperature or becomes solid through heat treatment. It is a substance that is
A method for producing a porous sheet material with good scratch resistance, characterized in that a substance that lowers the coefficient of friction is applied to a thickness of 0.01 to 10 microns.