Preparation method of double-surface foamed high-wrinkle-resistance polyurethane leather

Abstract

The invention discloses a preparation method of double-surface foamed high-wrinkle-resistance polyurethane leather. The preparation method comprises the following steps: (1) placing base cloth in polyurethane impregnation slurry, and extruding through extruding rolls to obtain a base cloth layer, wherein the distance between each two extruding rolls is 0.3-0.6 mm; and (2) coating the base cloth layer obtained in step (1) with first polyurethane foaming slurry in a scraping manner, then solidifying in a coagulating tank which contains a dimethylformamide-water system, washing via a plurality ofwashing tanks, and drying to obtain a wet-method semi-finished product of the base cloth layer and the first polyurethane foaming layer, wherein the temperature of a drying oven for drying is controlled to be 100-180 DEG C. According to the preparation method of the double-surface foamed high-wrinkle-resistance polyurethane leather, a two-surface foaming technology is adopted, and the obtained double-surface foamed high-wrinkle-resistance polyurethane leather is fine and smooth in folding mark and is stiff; the double-surface foamed high-wrinkle-resistance polyurethane leather has a six-layered structure; and the product is environmentally friendly, DMF residues are less, and wear resistance, scratching resistance and hydrolysis resistance are excellent.

Description

technical field [0001] The invention relates to the field of leather, in particular to a method for preparing double-sided foamed high-wrinkle-resistant polyurethane leather. Background technique [0002] Polyurethane Synthetic Leather has the advantages of high strength, wear resistance, cold resistance, breathability, aging resistance, solvent resistance, soft texture, beautiful appearance, etc., and has good processing performance. It is an ideal imitation leather product instead of natural leather. PVC leather is excellent. Polyurethane synthetic leather is widely used in clothing, shoemaking, luggage, furniture and other industries. [0003] The industrial production methods of polyurethane synthetic leather mainly include dry method and wet method. [0004] 1. Dry process polyurethane synthetic leather [0005] The dry production process generally uses the release paper as the carrier, scrapes the polyurethane resin slurry on the release paper (usually once or twice...

AI Technical Summary

Problems solved by technology

[0009] 1. Foaming on one side cannot achieve fine creases on both sides;

[0010] 2. The residual amount of DMF solvent is large, the product is not environmentally friendly and harmful to health;

[0011] 3. The cells of the foam layer are uneven and not dense, and the product is not stiff enough;

[0012] 4. Thick products, such as the thickness of 1.75mm or more, are basically formed by compounding two materials. The process of compounding two materials requires high processing and labor costs;

[0013] 5. The scratch resistance and wear resistance are not good, the product has low hydrolysis resistance, and it is easy to pulverize and peel off;

[0014] 6. If one-side foaming is used for dry processing first, the product has poor air permeability; the other side is coated with foam layer, the solvent will not evaporate, and the product surface will be corroded by the solvent to cause rotten surface. If the product quality is improved, the process is complicated and the equipment expensive, high cost

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