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Polyurethane resin for hydrolysis-resistant film nubuck and preparation method of polyurethane resin

A polyurethane resin, hydrolysis-resistant technology, applied in textiles and papermaking, etc., can solve the problems of poor hydrolysis resistance, difficult to meet the requirements of high hydrolysis resistance of nubuck leather, and achieve high hydrolysis resistance, good color development, cost low effect

Active Publication Date: 2015-01-14
ZHEJIANG HUAFON SYNTHETIC RESIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain a fine and uniform vertical cell structure, it is necessary to use a polyurethane resin with strong intermolecular cohesion. The main component of the polyol compound is usually polyester diol, but the polyester polyurethane resin has poor hydrolysis resistance and is difficult to obtain. Meet the high hydrolysis resistance requirements of special purpose nubuck leather

Method used

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  • Polyurethane resin for hydrolysis-resistant film nubuck and preparation method of polyurethane resin
  • Polyurethane resin for hydrolysis-resistant film nubuck and preparation method of polyurethane resin
  • Polyurethane resin for hydrolysis-resistant film nubuck and preparation method of polyurethane resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In a heatable reaction vessel equipped with a distillation column and a conical distillation receiver, add 10.48kg of adipic acid, 1.19kg of phthalic anhydride and 8.33kg of neopentyl glycol, turn on the stirring device and nitrogen atmosphere protection After the installation, the temperature was raised to 140°C, and the product water was removed by distillation during the reaction. At this time, the acid value was measured to be about 35 mgKOH / g. Then add 2.0g of catalyst tetraisopropyl titanate TIPT, reduce the pressure to 10-15mbar, raise the temperature to about 180°C, continue the polycondensation reaction, and remove the product water by distillation during the reaction process. Measure the hydroxyl value and acid value of the mixture in the reaction vessel. When the hydroxyl value reaches 56.1mgKOH / g and the acid value reaches about 0.35mgKOH / g, cool the reaction vessel, lower the temperature to room temperature, and terminate the reaction to obtain polyadipate o...

Embodiment 2

[0042] In a heatable reaction vessel equipped with a distillation tower and a conical distillation receiver, add 10.66kg of adipic acid, 1.20kg of phthalic anhydride and 8.14kg of neopentyl glycol, turn on the stirring device and nitrogen atmosphere protection After the installation, the temperature was raised to 160°C, and the product water was removed by distillation during the reaction. At this time, the acid value was measured to be about 38 mgKOH / g. Then add 2.2g of catalyst tetraisopropyl titanate TIPT, lower the pressure to 10-15mbar, raise the temperature to about 220°C, continue the polycondensation reaction, and remove the product water by distillation during the reaction process. Measure the hydroxyl value and acid value of the mixture in the reaction vessel. When the hydroxyl value reaches 37.4mgKOH / g and the acid value reaches about 0.38mgKOH / g, cool the reaction vessel, lower the temperature to room temperature, and terminate the reaction to obtain polyadipate ort...

Embodiment 3

[0044]

[0045] First, polyadipate 1,4-butylene glycol ester diol, polyadipate phthalic anhydride neopentyl glycol ester diol, antioxidant, 1.66kg of diisocyanate and 13.77kg of dimethyl formamide, the reaction temperature is 70°C, and the reaction time is 1.0 to 1.5 hours to obtain a prepolymer;

[0046] Add 6.89 kg of dimethylformamide and polyoxypropylene diol to the prepolymer, stir for 40 minutes, add 0.45 kg of diisocyanate to react, the reaction temperature is 70 ° C, and the reaction time is 1.5 hours to obtain the prepolymer ;

[0047] Add 17.22 kg of dimethylformamide and chain extender to the prepolymer, stir for 40 minutes, add the remaining diisocyanate to react, the reaction temperature is 70°C, and the reaction time is 4.0 hours;

[0048] After adding the remaining dimethylformamide and methanol to react for 15 minutes, polycarbodiimide was added to obtain the polyurethane resin for hydrolysis-resistant film nubuck leather.

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Abstract

The invention provides polyurethane resin for hydrolysis-resistant film nubuck and a preparation method of the polyurethane resin. The polyurethane resin for the hydrolysis-resistant film nubuck is prepared by adopting the following components in percentage by weight: 5.0%-12.0% of poly(adipic acid) 1,4-butanediol esterdiol, 7.0%-9.0% of poly(adipic acid) phthalic anhydride neopentyl glycol esterdiol, 4.0%-8.0% of polypropylene oxide glycol, 0.01%-0.10% of antioxidants, 1.0%-3.0% of chain extenders, 0.05%-0.50% of auxiliary agents, 9.0%-13.0% of 4,4-diphenylmethane diisocyanate, 0.05%-0.50% of methanol and 55%-73% of dimethyl formamide. The film nubuck prepared from the polyurethane resin provided by the invention has a uniform and compact upright cellular structure, has good color development after being smoothed and is high in hydrolysis resistance and low in cost.

Description

technical field [0001] The invention relates to a polyurethane resin for film nubuck, in particular to a polyurethane resin for hydrolysis-resistant film nubuck. Background technique [0002] Nubuck leather, also known as "nubuck leather" or "imitation suede", is characterized in that polyurethane resin forms a continuous elastic body containing numerous upright cells in the network structure of non-woven fabrics or woven fabrics, and then the surface is dense. Layer grinding and post-treatment, so that the leather surface has a layer of evenly distributed, plump and delicate short fluff, so that the leather product has the excellent characteristics of natural leather, soft luster, soft texture, high elasticity, and good moisture permeability. It is used for the production of fabrics for high-end sports shoes, travel shoes, and fashion shoes, as well as covering materials for walls, doors and windows, sofas, automobiles, and aviation. [0003] The cell structure of nubuck l...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/48C08G18/42C08G18/32D06N3/14C08G101/00
CPCC08G18/12C08G18/3206C08G18/4018C08G18/4202C08G18/4216C08G18/4238C08G18/4825C08G18/6607C08G2101/00D06N3/14C08G18/48C08G18/32
Inventor 杨信实张初银代道胜吴晓敏于吉鹏蔡文武
Owner ZHEJIANG HUAFON SYNTHETIC RESIN
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