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Polyurethane resin for solvent-free leather, preparation method and application

A polyurethane resin and solvent-free technology, which is applied in the field of solvent-free leather polyurethane resin and its preparation and application, can solve the problems of limited influence on the physical properties of synthetic leather products, and achieve the goal of improving production operability, high production efficiency and ensuring stability Effect

Active Publication Date: 2022-03-11
ZHEJIANG HUAFON SYNTHETIC RESIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this patent application, aliphatic isocyanate is added to component A, and the isocyanate in component A reacts preferentially with small molecule diols and small molecule triols according to its ratio to form hydroxyl-terminated small molecule prepolymers, which solves the problem of low Compatibility between polymer polyols and small molecule polyols, but the impact on the physical properties of synthetic leather products is very limited, and it is necessary to improve the physical properties of aliphatic solvent-free leather by adding carbon fiber materials

Method used

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  • Polyurethane resin for solvent-free leather, preparation method and application
  • Polyurethane resin for solvent-free leather, preparation method and application
  • Polyurethane resin for solvent-free leather, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] 30.00kg of polyether ester-toluene diisocyanate prepolymer (number average molecular weight is 10000, functionality is 2), 26.00kg of polyoxypropylene glycol (number average molecular weight is 5000), 19.50kg of polyoxypropylene tri Polyhydric alcohol (number average molecular weight is 9000), 19.50kg polyoxypropylene tetrahydric alcohol (number average molecular weight is 10000) is heated up to 120°C, dehydrated under -0.01MPa vacuum condition for 6h, after cooling to 30°C, add 2.10kg Ethylene glycol, 0.90kg of trimethylolpropane, 0.70kg of silicone foam stabilizer, 0.3kg of deionized water, 0.65kg of ultraviolet absorber UV-320, 0.30kg of light stabilizer 292, 0.05kg of Antioxidant 245 and 0.30 kg of organotin metal catalyst were mixed and stirred for 2 hours, and the hydroxyl value and moisture content were detected. When the hydroxyl value reached 85.2 mgKOH / g and the moisture content was controlled at 0.3%, the resin component A was prepared, sealed and packaged us...

Embodiment 2

[0058] 45.00kg of polyether ester-diphenylmethane diisocyanate prepolymer (number average molecular weight is 10000, functionality is 4), 35.00kg of polytetrahydrofuran ether diol (number average molecular weight is 10000), 10.00kg of poly Propylene oxide-ethylene oxide triol (number average molecular weight is 12000), 5.00kg polyoxypropylene tetraol (number average molecular weight is 20000) is heated up to 140°C, dehydrated for 5h under vacuum condition of -0.06MPa, and then cooled to 50°C, add 2.47kg of 1,4-butanediol, 0.13kg of trimethylolpropane, 0.30kg of silicone foam stabilizer, 0.30kg of deionized water, 0.45kg of ultraviolet absorber UV-320, 0.36kg of light stabilizer 292, 0.09kg of antioxidant 245 and 0.90kg of organic tin metal catalyst were mixed and stirred for 2 hours, and the hydroxyl value and moisture content were detected. When the hydroxyl value reached 62.1mgKOH / g and the moisture content was 0.3%, that is Obtain resin component A, seal and pack for use; ...

Embodiment 3

[0062] 38.00kg of polyether ester-toluene diisocyanate prepolymer (number average molecular weight is 30000, functionality is 3), 25.00kg of polyoxypropylene glycol (number average molecular weight is 20000), 25.00kg of polyoxypropylene tri Polyhydric alcohol (number average molecular weight: 18000) was heated up to 130°C, dehydrated for 5h under vacuum condition of -0.04MPa, then cooled to 40°C, added 4.50kg of ethylene glycol, 0.50kg of trimethylolpropane, 2.00kg of organic Silicon foam stabilizer, 2.00kg of deionized water, 0.64kg of ultraviolet absorber UV-320, 1.64kg of light stabilizer 292, 0.32kg of antioxidant 245 and 0.40kg of organic tin metal catalyst were mixed and stirred for 3 hours, and the hydroxyl value and moisture content, when the hydroxyl value reaches 218.3mgKOH / g, and the moisture content is 2%, the resin component A is prepared, sealed and packaged for use;

[0063] In the reactor, drop into the toluene diisocyanate of 24.94kg, the polyethylene adipate ...

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Abstract

The invention discloses a solvent-free synthetic leather polyurethane resin and its preparation method and application. The resin A component contains 30% to 45% by weight of polyether ester polyol-polyisocyanate prepolymer, weight percentage 50%-65% of polyether polyol A and 0.3%-2.0% of water by weight, the resin B component contains 20%-60% of diisocyanate by weight. The polyurethane resin of the solvent-free synthetic leather of the present invention only needs to scrape and coat the solvent-free resin once to produce the synthetic leather, and can have the structure of the surface layer, the bonding layer and the foaming layer, the process is simple, and the physical and mechanical properties are excellent.

Description

technical field [0001] The invention relates to a solvent-free polyurethane leather resin and its preparation method and application Background technique [0002] Solvent-free polyurethane resin generally contains two or more components. During the production of synthetic leather, two or more resin components undergo chain extension, foaming and gel reactions directly on the substrate. [0003] The production process of solvent-free polyurethane synthetic leather is: [0004] (1) Scrape coating and drying the surface layer: two or more surface layer resin components are transported to the mixing head in a certain proportion, mixed evenly, and immediately injected on the release paper, and coated by scraping to form a film After entering the drying tunnel, the polyurethane resin components react quickly, the molecular weight of the polymer increases sharply, and the polyurethane synthetic leather surface layer with a characteristic group structure is quickly generated; [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/08C08L75/06C08G18/76C08G18/66C08G18/48C08G18/42C08G18/32D06N3/00D06N3/14
CPCD06N3/0077D06N3/0097D06N3/148C08G18/3206C08G18/4238C08G18/4825C08G18/4829C08G18/4845C08G18/6674C08G18/6677C08G18/7614C08L75/08C08L2205/02D06N2211/28C08L75/06
Inventor 于吉鹏张初银付志朋马元明吴晓敏张兵
Owner ZHEJIANG HUAFON SYNTHETIC RESIN