Special high-physical-property high-dyeing polyurethane resin for superfine fiber synthetic leather and preparation method of special high-physical-property high-dyeing polyurethane resin

Abstract

The invention discloses a special high-physical-property high-dyeing polyurethane resin for superfine fiber synthetic leather and a preparation method of the special high-physical-property high-dyeingpolyurethane resin. The special high-physical-property high-dyeing polyurethane resin for the superfine fiber synthetic leather comprises the following components in percentages by weight: 1-15% of polyether polyol, 1-15% of polyester polyol, 5-10% of isocyanate, 0.5-1% of small molecular polyol, 1-2% of an end-capping agent, 0.1-1% of an antioxidant, 0.5-1% of silicone oil, 0.01% of a catalyst and the balance of a solvent. The polyester polyol comprises a combination of one or more polyester polyols with different structures, and any one of the polyester polyols is mainly formed by polycondensation of a dibasic acid compound and dihydric alcohols or / and a dihydric alcohol derivative; and the glycol derivative is preferably N-methyldiethanolamine. The invention also discloses a preparation method of the polyurethane resin. The polyurethane resin obtained by the method disclosed by the invention has the advantages that the stripping strength and the tearing strength are improved whilethe dyeing property is guaranteed, the setting time is shortened, the myogenicity is high, a large-kettle production process is simple, the reaction can be smoothly carried out, the explosion polymerization is avoided, and the industrialized popularization is facilitated.

Description

technical field [0001] The invention relates to a polyurethane resin and a preparation method thereof, in particular to a high-physical and highly-dyed polyurethane resin specially used for superfine fiber synthetic leather and a preparation method thereof. Background technique [0002] In 2010, my country's microfiber leather consumption reached 92 million square meters, and the compound annual growth rate of my country's microfiber leather consumption from 2005 to 2010 was 35.69%. From 2011 to 2015, the market demand for microfiber leather in my country increased from 110 million square meters to 236 million square meters, and the average annual compound growth rate will reach 21%. Suede leather is mainly used in the shoe leather market. my country has become the world's largest producer and exporter of shoe products, and its total product volume ranks among the top in the world. With the improvement of the living standards of domestic residents and the increasing environ...

AI Technical Summary

Problems solved by technology

In this invention, N-methyldiethanolamine (MDEA) is introduced as a chain extender. This technology can greatly improve the dyeability of the resin, and the K / S value is increased by 10 times; however, the crystallization of the resin is caused by the methyl side chain in MDEA. Decrease in peel strength, increase in solidification time, decrease in shape and area retention rate, which is not conducive to the performance of microfiber synthetic leather. The most fatal defect is that in the production of large kettles, due to the high reactivity of hydroxyl groups in MDEA, production The process is particularly prone to local detonation, which makes it impossible to promote industrialization

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