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

A technology of polyurethane leather and polyurethane, which is applied in the direction of textiles and papermaking, can solve the problems of non-environmental protection, low hydrolysis resistance, and poor air permeability of products, and achieve diversified appearance styles and effects, superior scratch resistance and wear resistance, The effect of high hydrolysis resistance

Inactive Publication Date: 2019-03-15
ZHEJIANG HEXIN NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

Examples

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Comparison scheme
Effect test

Embodiment 1

[0070] A double-sided foamed high-wrinkle-resistant ester polyurethane leather, a first polyurethane surface layer 1, an adhesive layer 2, a first polyurethane foam layer 3, a base fabric layer 4, a second polyurethane foam layer 5, and a second polyurethane surface Layer 6; the base fabric layer is formed after the base fabric is impregnated with polyurethane impregnating slurry.

Embodiment 2

[0072] A method for preparing double-sided foamed high-wrinkle-resistant polyurethane leather, comprising the steps of:

[0073] Arranging the bottom in the polyurethane impregnated slurry, and then extruding through extrusion rollers, the distance between the extrusion rollers being 0.3-0.6mm, to obtain the bottom cloth layer;

[0074] Squeegee-coat the first polyurethane foam slurry on the base cloth layer obtained in step (1), then place it in a coagulation tank filled with dimethylformamide-water system to solidify, and then wash it in multiple washing tanks, and then carry out Drying, the temperature of the oven used in the drying is controlled at 100-180°C to obtain a wet-process semi-finished product of the base cloth layer + the first polyurethane foam layer;

[0075] Unwind the release paper, coat the first polyurethane surface layer slurry on the surface of the release paper, the coating thickness is 0.1-0.25mm, dry and cool, the oven temperature used is 60 ° C ~ 150...

Embodiment 3

[0090] A double-sided foamed high anti-wrinkle polyurethane leather, the first polyurethane surface layer, the adhesive layer, the first polyurethane foam layer, the base cloth layer, the second polyurethane foam layer, and the second polyurethane surface layer; the base cloth The layer is formed after the base fabric is impregnated with polyurethane impregnating slurry.

[0091] The polyurethane impregnating slurry includes the following raw materials in parts by weight: 100 parts of polyurethane resin, 1200 parts of dimethylformamide, and 1 part of wet color paste; the viscosity of the polyurethane impregnating slurry is 1000 cps / 25°C;

[0092] The first polyurethane foam layer includes the following raw materials in parts by weight: 100 parts of polyurethane resin, 80 parts of dimethylformamide, 40 parts of calcium carbonate, 0.1 part of defoamer, 0.5 part of washing aid, 1 part of wet color paste parts; after the raw materials of the first polyurethane foam layer are mixed...

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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...

Claims

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Application Information

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IPC IPC(8): D06N3/00D06N3/14
CPCD06N3/0043D06N3/0059D06N3/0077D06N3/0086D06N3/0088D06N3/0097D06N3/145
Inventor 戴丽周志军汪旗洪斌陈永
Owner ZHEJIANG HEXIN NEW MATERIAL CO LTD
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