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Polyurethane resin for waterproof vapor permeable leather and preparation method thereof

A technology for polyurethane resin and leather, applied in the field of polyurethane resin, can solve the problems of no waterproof effect and decreased vapor permeability

Active Publication Date: 2021-09-10
HUAFON MICROFIBER SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Microfiber suede leather has good moisture permeability, but has no waterproof effect. After finishing and padding with fluorine-based waterproofing agent, the waterproof effect is good but the vapor permeability decreases.

Method used

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  • Polyurethane resin for waterproof vapor permeable leather and preparation method thereof
  • Polyurethane resin for waterproof vapor permeable leather and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Polybutylene adipate diol (0.05mol), polytetrahydrofuran ether diol (0.05mol), double-terminal hydroxyl long-chain alkyl silicone oil (0.01mol), solvent N,N-dimethyl Mix formamide (100ml), add 4,4'-diphenylmethane diisocyanate (0.088mol), and react at 75°C until the content of isocyanate groups is constant;

[0026] (2) Add ethylene glycol (0.23mol), N,N-dimethylformamide (80ml), add 4,4'-diphenylmethane diisocyanate (0.224mol), react at 75°C for 1 hour, add solvent Add 4,4'-diphenylmethane diisocyanate (0.032mol) to N,N-dimethylformamide (194ml), and stop adding when the viscosity reaches 120Pa·s (25°C). Methanol (0.003mol) was added to stop the reaction, and after 30 minutes, the temperature was lowered to 50°C and the material was discharged to obtain the polyurethane resin with a solid mass fraction of 30%.

Embodiment 2

[0028] (1) Polyhexamethylene adipate diol (0.08mol), polypropylene glycol (0.02mol), double-ended hydroxyl long-chain alkyl silicone oil (0.003mol), double-ended hydroxyl polytrifluoropropylmethylsilane Put oxane (0.002mol) and solvent N,N-dimethylformamide (100ml) into the reaction flask, mix well, put in 4,4'-diphenylmethane diisocyanate (0.08mol), react at 75°C until Constant isocyanate group content;

[0029] (2) After the prepolymerization is completed, add ethylene glycol (0.316mol), solvent N,N-dimethylformamide (80ml), add 4,4'-diphenylmethane diisocyanate (0.32mol), 75°C React for 1 hour, add the remaining solvent N,N-dimethylformamide (210g), continue to add 4,4'-diphenylmethane diisocyanate (0.02mol), the viscosity rises to 100Pa·s (25°C ) viscosity, stop adding. Methanol (0.003mol) was added to stop the reaction, and after 30 minutes, the temperature was lowered to 50°C and the material was discharged to obtain the polyurethane resin with a solid mass fraction of...

Embodiment 3

[0031] (1) Polybutylene adipate diol (0.04mol), polytetrahydrofuran ether diol (0.06mol), double-ended hydroxyl long-chain alkyl silicone oil (0.006mol), double-ended hydroxyl polytrifluoropropyl Add methylsiloxane (0.002mol) and solvent N,N-dimethylformamide (100ml) into the reaction flask, mix well, add 4,4'-diphenylmethane diisocyanate (0.339mol), and heat at 75°C Reaction until the isocyanate group content is constant;

[0032] (2) After the prepolymerization is completed, add ethylene glycol (0.271mol), solvent N,N-dimethylformamide (80ml), add 4,4'-diphenylmethane diisocyanate (0.272mol), 75°C React for 1 hour, add the remaining solvent N,N-dimethylformamide (200g), continue to add 4,4'-diphenylmethane diisocyanate (0.016mol), the viscosity rises to 80Pa·s (25°C) When viscosity is reached, stop adding. Methanol (0.003mol) was added to stop the reaction, and after 30 minutes, the temperature was lowered to 50°C and the material was discharged to obtain the polyurethane ...

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Abstract

The invention discloses a polyurethane resin for waterproof and vapor-permeable leather and a preparation method thereof. The ratio of moles of polyol A and polyol B to polyol A and polyol B is 1.5:1 to 5:1; the moles of terminator are the moles of diisocyanate to moles of polyol A, polyol B and chain extender 2 times of the difference; the amount of solvent used is 65% to 80% of the total weight of polyol A, polyol B, diisocyanate, chain extender, terminator and solvent. The invention has excellent hydrophobicity, and at the same time ensures that the resin part forms a three-dimensional interpenetrating hole structure during the wet solidification process, and the diameter of the hole is small, allowing water vapor to easily pass through; when used in superfine fiber suede, it has very excellent suede Sensitive, sensual, production has the characteristics of simple and easy operation.

Description

technical field [0001] The invention relates to a polyurethane resin for leather and a preparation method thereof, in particular to the polyurethane resin which can be used as a raw material for superfine fiber synthetic leather base cloth with excellent waterproof, vapor permeability and mechanical properties. Background technique [0002] At present, microfiber synthetic leather is comparable to high-grade natural leather in terms of appearance, texture, physical properties and wearing comfort, and has been widely used in clothing, shoemaking, automobiles and other fields. Microfiber synthetic leather is mainly composed of polyurethane and fibers. The surface of conventional veneer leather is a dense resin film, which has good water resistance, but poor air permeability, while suede leather is just the opposite. It is suitable for various sports applications. Goods, industrial safety supplies, military supplies, etc., need to have excellent waterproof and vapor permeabilit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/61C08G18/48C08G18/42C08G18/12C08G18/32
Inventor 杜明兵杨银龙胡忠杰张其斌韩芹
Owner HUAFON MICROFIBER SHANGHAI
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