A wet polyurethane resin for impregnation with high tear strength and hydrolysis resistance and preparation method thereof

Abstract

The invention discloses wet polyurethane resin with high tear strength and hydrolysis resistance for impregnation and a preparation method of the wet polyurethane resin. The polyurethane resin comprises the following components in parts by mass: 6-10 parts of isocyanate, 16-26 parts of polyol compound, 1-3 parts of polyol chain extender, 0-0.3 part of antioxidant, 0-0.05 part of reaction terminator methanol, and an organic tin or organic bismuth catalyst, wherein the dosage of the organic tin or organic bismuth catalyst is 0.001-0.05 percent of the mass of the polyol compound. The polyurethane resin can be used for greatly improving and increasing physical properties, such as peel strength, tear strength and hydrolysis resistance, of resins, is durable, and has market competitiveness.

Description

1. Technical field

[0001] The invention relates to a functional polyurethane resin and a preparation method thereof, in particular to a wet polyurethane resin for impregnation with high tear strength and hydrolysis resistance and a preparation method thereof. 2. Background technology

[0002] Polyurethane synthetic leather can make the back of the cloth base have the effect of imitation leather through the impregnation process, with high grade and good quality. The impregnation resin generally requires excellent hydrolysis resistance, fast impregnation speed, and suitable film-forming property, which is conducive to the penetration of the coating material, strengthens the combination of the coating material and the cloth base, and the finished leather has a higher tear strength. The existing hydrolysis-resistant impregnation resin usually uses polytetrahydrofuran diol, but because of its high cost, the tear strength tends to drop rapidly when the modulus is slightly high. In...

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