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Waterborne polyurethane synthetic leather and preparation method thereof

A water-based polyurethane and synthetic leather technology, which is applied in the field of synthetic leather manufacturing, can solve the problems of poor flexibility and folding resistance, and achieve the effect of soft hand feeling, excellent folding resistance and uniform distribution

Active Publication Date: 2020-08-14
浙江昶丰新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved in the present invention is to overcome the defects of poor flexibility and folding resistance of water-based polyurethane synthetic leather in the prior art, thereby providing a kind of water-based polyurethane synthetic leather with excellent flexibility and folding resistance and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Immerse 220 grams per square meter of ordinary polyester non-woven fabric with a thickness of 0.9mm in an aqueous solution of polyvinyl alcohol with a concentration of 5% and a viscosity of 100CPs. It is fully pressed by two dipping and two rolling rolls, and then placed in 130˚C for drying. Bake for 4 minutes to obtain a pretreated non-woven fabric, impregnate it in the slurry of water-based polyurethane, press it through the rolls, and then impregnate it in the slurry of water-based polyurethane again, and control the gap between the rolls to 60% for gap rolling to obtain impregnated non-woven fabrics. For woven fabric, solidify the impregnated non-woven fabric at a microwave frequency of 500MHz and a temperature of 130°C for 2 minutes, then wash with water and bake at 140°C for 3 minutes to obtain a non-woven fabric sheet, and apply the surface layer slurry On the release paper, scrape the thickness of 0.12mm, put it in the oven and bake it at 80˚C, 100˚C, and 130˚C f...

Embodiment 2

[0033] Immerse 220 grams per square meter of ordinary polyester non-woven fabric with a thickness of 0.9mm in an aqueous solution of polyvinyl alcohol with a concentration of 10% and a viscosity of 670CPs. It is fully pressed by two dipping and two rolling rolls, and then placed in 130°C for drying. Bake for 4 minutes to obtain a pretreated non-woven fabric, impregnate it in the slurry of water-based polyurethane, press it through the rolls, and then impregnate it in the slurry of water-based polyurethane again, and control the gap between the rolls to 60% for gap rolling to obtain impregnated non-woven fabrics. For woven fabric, solidify the impregnated non-woven fabric at a microwave frequency of 1500MHz and a temperature of 70°C for 3 minutes, then wash with water and bake at 140°C for 3 minutes to obtain a non-woven fabric sheet, and apply the surface layer slurry On the release paper, scrape the thickness of 0.12mm, put it in the oven and bake it at 80˚C, 100˚C, and 130˚C ...

Embodiment 3

[0039] Immerse 220 grams per square meter of ordinary polyester non-woven fabric with a thickness of 0.9mm in an aqueous solution of polyvinyl alcohol with a concentration of 12% and a viscosity of 800CPs, press it through two dipping and two rolling rolls, and then put it in 130°C for drying. Bake for 4 minutes to obtain a pretreated non-woven fabric, impregnate it in the slurry of water-based polyurethane, press it through the rolls, and then impregnate it in the slurry of water-based polyurethane again, and control the gap between the rolls to 60% for gap rolling to obtain impregnated non-woven fabrics. For woven fabrics, solidify the impregnated non-woven fabric at a microwave frequency of 2500MHz and a temperature of 60 °C for 1 minute, then wash with water and bake at 140 °C for 3 minutes to obtain a non-woven fabric sheet, and apply the surface layer slurry On the release paper, scrape the thickness of 0.12mm, put it in the oven and bake it at 80˚C, 100˚C, and 130˚C for ...

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PUM

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Abstract

The invention belongs to the technical field of production of synthetic leather and particularly relates to waterborne polyurethane synthetic leather and a preparation method thereof. The preparationmethod comprises the following steps: (1) impregnating non-woven fabric with a preimpregnating solution, and performing press-rolling and drying on the non-woven fabric to obtain pretreated non-wovenfabric; (2) impregnating the pretreated non-woven fabric in waterborne polyurethane size to obtain impregnated non-woven fabric; (3) solidifying the impregnated non-woven fabric under a microwave condition, washing the non-woven fabric with water, and drying the non-woven fabric to form non-woven fabric sheets; (4) performing veneering on the non-woven fabric sheets to obtain the waterborne polyurethane synthetic leather. According to the waterborne polyurethane synthetic leather and the preparation method, solidification is performed under the microwave condition, so that local polyurethane is prevented from forming a film under drying on the fiber surface, adhesion between polyurethane and fiber is reduced, and the polyurethane synthetic leather with soft feel and excellent folding resistance is prepared.

Description

technical field [0001] The invention belongs to the technical field of synthetic leather manufacture, and in particular relates to a water-based polyurethane synthetic leather and a preparation method thereof. Background technique [0002] Non-woven fabric, also known as non-woven fabric, is a kind of fabric formed without weaving gauze. It is formed by orienting or randomly arranging short textile fibers or filaments to form a web structure, and then adopting mechanical, thermal bonding or chemical methods, etc. Reinforced. Non-woven fabrics are widely used in the preparation of synthetic leather due to their moisture-proof, breathable, light weight and rich colors. The front and back are very similar to leather, and have a certain degree of air permeability, which is closer to natural leather than ordinary artificial leather, so it is widely used in the production of shoes, boots, bags, car seats and sofas. The so-called synthetic leather often refers to polyurethane syn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06N3/14D06N3/00D06M15/59D06M10/00
CPCD06M10/003D06M15/59D06N3/0004D06N3/0011D06N3/0045D06N3/0059D06N3/0097D06N3/145D06N2205/023D06N2209/103D06N2211/28
Inventor 赵学辉邵晨旭
Owner 浙江昶丰新材料有限公司