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Preparation method of epoxy resin-modified polyurethane emulsion leather finishing agent

A technology of polyurethane emulsion and leather finishing agent, which is applied in the field of leather chemistry, can solve the problems of insufficient adhesion, leveling, and hygienic performance that cannot meet people's requirements, and achieve the effect of promoting firm bonding, high strength, and simple process

Inactive Publication Date: 2013-05-01
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these leather finishing agents have insufficient adhesion, leveling, etc. to the bottom layer, especially the hygienic performance cannot meet people's requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0017] Dehydrate 3kg of polyoxyethylene diol under vacuum at 110°C for 1h, then lower the temperature to 50°C; add 1kg of toluene diisocyanate and 1g of dibutyltin dilaurate under nitrogen protection, and react at 75°C for 3h , then lower the temperature to 30°C; add 500g epoxy resin E-12, 300g N-methyldiethanolamine, react at 60°C for 4h, then lower the temperature to 40°C; add glacial acetic acid to adjust the pH value to 6, then Add 10kg of acetone for dilution, then add 10kg of deionized water for high-speed emulsification, vacuum remove the acetone solvent to obtain an epoxy resin modified cationic polyether polyurethane emulsion.

Embodiment 2-1

[0019] Dehydrate 4kg of polyoxyethylene diol under vacuum at 120°C for 2h, then lower the temperature to 70°C; add 1.5kg of toluene diisocyanate and 50g of stannous octoate under nitrogen protection, react at 85°C for 2h, and then Lower the temperature to 40°C; add 1kg epoxy resin E-20, 600g N-methyldiethanolamine, react at 65°C for 2 hours, then lower the temperature to 50°C; add glacial acetic acid to adjust the pH to 7, then add 2kg of acetone Dilute, then add 8 kg of deionized water for high-speed emulsification, and vacuum remove the acetone solvent to obtain an epoxy resin-modified cationic polyether polyurethane emulsion.

Embodiment 3-1

[0021] Dehydrate 3.5kg of polyoxyethylene diol under vacuum at 115°C for 1.5h, then lower the temperature to 60°C; add 1.2kg of toluene diisocyanate and 5g of stannous octoate under nitrogen protection, and react at 80°C for 2.5h , then lower the temperature to 35°C; add 600g epoxy resin E-42, 400g N-methyldiethanolamine, react at 62°C for 3h, then lower the temperature to 45°C; add glacial acetic acid to adjust the pH value to 5, then Add 5kg of acetone for dilution, then add 9kg of deionized water for high-speed emulsification, vacuum remove the acetone solvent to obtain an epoxy resin modified cationic polyether polyurethane emulsion.

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Abstract

The invention relates to a preparation method of an epoxy resin-modified polyurethane emulsion leather finishing agent and aims to solve the problem of insufficient comprehensive performance of the existing finishing agent. The preparation method comprises the following steps: firstly preparing epoxy resin-modified cationic polyether type polyurethane emulsion and finishing agent solution; and then uniformly mixing in a mechanical manner according to the weight ratio of 100:5-10. A preparation method of the epoxy resin-modified cationic polyether type polyurethane emulsion comprises the following steps: adding toluene diisocynate and a catalyst into dehydrated polyoxyethylene glycol, then adding N-methyldiethanolamine for continuous reaction, regulating the pH value to 5-7 and finally adding acetone and deionized water. A preparation method of the finishing agent solution comprises the following steps: adding hydroxyethyl cellulose into sodium hydroxide solution, then adding epoxypropyl trimethyl ammonium chloride for reaction, washing and drying a solid product and dissolving into deionized water with polyvinylpyrrolidone. The preparation method has the benefits that the process is simpler; and the prepared leather finishing agent not only has high film strength and excellent comprehensive performance, but also has good antibacterial performance.

Description

technical field [0001] The invention belongs to the technical field of leather chemistry and relates to a preparation method of a leather finishing agent, in particular to a preparation method of an epoxy resin modified polyurethane emulsion leather finishing agent. Background technique [0002] Leather finishing agent is an important leather chemical that improves the appearance, performance and economic value of leather. After finishing the leather with a finishing agent, a uniform film protective layer is formed on the surface of the leather, which endows the leather with excellent performance such as solvent resistance, flex resistance, wet and dry rub resistance, impact resistance and water resistance. With the development of science and technology, people's demand for leather quality is getting higher and higher, and the quality of leather depends largely on the quality of leather finishing agent. [0003] At present, leather finishing agents mainly include nitrocellu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C09D101/26C09D139/06C09D5/14C14C11/00C08G18/76C08G18/48C08G18/58C08B15/06
Inventor 聂秋林袁求理
Owner HANGZHOU DIANZI UNIV
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