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A kind of high physical properties solvent-free polyurethane fabric resin for leather and preparation method thereof

A solvent-free polyurethane technology with high physical properties, applied in the field of leather, can solve the problem of not achieving complete environmental protection, and achieve the effects of high physical properties, enhancing resin physical properties, and adjusting resin viscosity

Active Publication Date: 2022-04-29
浙江兆泽实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing process still uses solvent-based PU surface layer resin, which is not completely environmentally friendly and has become a major criticism in the solvent-free PU leather industry.

Method used

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  • A kind of high physical properties solvent-free polyurethane fabric resin for leather and preparation method thereof
  • A kind of high physical properties solvent-free polyurethane fabric resin for leather and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method of a kind of high physical properties solvent-free polyurethane fabric resin for leather described in this embodiment comprises the following steps:

[0030] (1) Preparation of component A: Put 300 parts of polycaprolactone polycarbonate copolymer polyol (number average molecular weight 1800g / mol, viscosity 2700cps / 25°C) into the reaction kettle, stir and heat up to 110°C, Vacuumize and dehydrate for 2 hours under the condition of vacuum degree -0.09MPa, then cool down to 70°C, add 10 parts of 4,4-diphenylmethane diisocyanate, 2.5 parts of MDI-50 (50% 4,4-diphenylmethane diisocyanate isocyanate, a mixture of 50% 2,4-diphenylmethane diisocyanate), reacted for 3 hours until the NCO content was <0.2%, lowered the temperature to 40°C, and added 9.4 parts of polyfunctional polycaprolactone polyol (number average molecular weight 1000 g / mol, functionality 3), 3.1 parts of ethylene glycol, 9.4 parts of dipropylene glycol, 15.6 parts of bisphenol F epoxy ...

Embodiment 2

[0034] The preparation method of a kind of high physical properties solvent-free polyurethane fabric resin for leather described in this embodiment comprises the following steps:

[0035] (1) Preparation of component A: Put 200 parts of polycaprolactone polycarbonate copolymer polyol (number average molecular weight 2000g / mol, viscosity 4600cps / 25℃) into the reaction kettle, stir and heat up to 130℃, Vacuumize and dehydrate for 3 hours under the condition of vacuum degree -0.01MPa, then cool down to 90°C, add 5.2 parts of toluene diisocyanate, react for 5 hours, until the NCO content is <0.2%, cool down to 60°C, add 6.2 parts of polyfunctional polyethylene Lactone polyol (number average molecular weight 1200 g / mol, functionality 3.5), 4.1 parts of 2-methyl-1,3-propanediol, 8.2 parts of diethylene glycol, 12.3 parts of bisphenol A epoxy resin (Epoxy equivalent 178 g / eq, viscosity 6000cps / 25°C), 0.4 parts polysiloxane defoamer, 0.5 parts polysiloxane leveling agent, 0.7 parts or...

Embodiment 3

[0039] The preparation method of a kind of high physical properties solvent-free polyurethane fabric resin for leather described in this embodiment comprises the following steps:

[0040] (1) Preparation of component A: Put 160 parts of polycaprolactone polycarbonate copolymer polyol (number average molecular weight 1500g / mol, viscosity 2100cps / 25°C) into the reactor, stir and heat up to 120°C, Vacuumize and dehydrate for 3 hours under the condition of vacuum degree -0.095MPa, then cool down to 80°C, add 5.6 parts of dicyclohexylmethane diisocyanate and 3.6 parts of 1,6-hexamethylene diisocyanate, react for 4 hours until the NCO content is <0.2%, and cool down To 50°C, add 8.5 parts of multifunctional polycaprolactone polyol (number-average molecular weight 1600 g / mol, functionality 3.2), 1.7 parts of 1,3-propanediol, 3.4 parts of 3-methyl-1.5 pentanediol , 11.8 parts of bisphenol F epoxy resin (epoxy equivalent 183g / eq, viscosity 12000cps / 25°C), 0.3 parts of polysiloxane defo...

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Abstract

The present invention relates to the technical field of leather, especially a kind of high physical properties solvent-free polyurethane fabric resin for leather, comprising A component and B component, and the A component comprises the following raw material components: polycaprolactone polycarbonate copolymer Polyol, multifunctional polycaprolactone polyol, isocyanate, small molecule alcohol, epoxy resin, defoamer, leveling agent, catalyst, antioxidant, the B component includes the following raw material components: isocyanate, Vegetable oil, polyfunctional polycaprolactone polyol, antioxidant. Also disclosed is a preparation method of the polyurethane fabric resin. The high-property solvent-free polyurethane fabric resin for leather obtained by the invention and the preparation method thereof can replace the solvent-based surface layer resin to produce polyurethane leather, and can help the solvent-free PU leather industry to realize completely environmentally friendly operations. The solvent-free fabrics it produces have very high physical properties.

Description

technical field [0001] The invention relates to the technical field of leather, in particular to a solvent-free polyurethane fabric resin with high physical properties for leather and a preparation method thereof. Background technique [0002] Solvent-free polyurethane resin, the main raw material of which is polyol, currently generally chooses polyether polyol with low crystallinity or polyester polyol with small and medium molecular weight, and the resin film produced by it has low physical properties, which cannot reach the current oily fabric resin physical properties. At present, the process commonly used in solvent-free PU leather is to scrape-coat the surface layer with solvent-based PU first, then scrape-coat solvent-free PU foaming material, and then bond it with the leather embryo. The existing process still uses solvent-based PU surface layer resin, which is not completely environmentally friendly and has become a major criticism in the solvent-free PU leather in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/58C08G18/44C08G18/42C08G18/32C08G18/36C08G18/10C08G18/12C08G18/75C08G18/79C08G18/73D06N3/14
CPCC08G18/7671C08G18/44C08G18/4277C08G18/10C08G18/7621C08G18/7607C08G18/12C08G18/6662C08G18/36C08G18/664C08G18/58C08G18/4045C08G18/755C08G18/797C08G18/725C08G18/724C08G18/758C08G18/73C08G18/722D06N3/146D06N3/145D06N2211/28C08G18/66
Inventor 施静息锁柱
Owner 浙江兆泽实业有限公司
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