Non-yellowing polyurethane resin for mirror synthetic leather and preparation method of polyurethane resin

Abstract

The invention discloses non-yellowing polyurethane resin for mirror synthetic leather and a preparation method of polyurethane resin. The non-yellowing polyurethane resin is prepared from following raw materials: polyol, a chain extender, diisocyanate, a solvent and an antioxidant, wherein polyol is a mixture of polytetramethylene ether glycol having a number average molecular weight of 2000, polytetramethylene ether glycol having a number average molecular weight of 3000, polydiol adipate having a number average molecular weight of 1000-3000; the chain extender is a mixture of C2-C6 aliphatic diol, piperazine and alicyclic diprimary amine; diisocyanate is aliphatic diisocyanate; the solvent comprises a solvent A, a solvent B and a solvent C, the solvent A is at least one selected from dimethylformamide and dimethylacetamide, the solvent B is at least one selected from toluene, butanone and ethyl acetate and the solvent C is at least one selected from isopropanol or isobutanol. By virtue of the non-yellowing polyurethane resin, the risk of generation of insoluble particulates and topical gel in the system is reduced and meanwhile, the non-yellowing polyurethane resin for synthetic leather has the characteristics of excellent low-temperature folding resistance and good anti-sticking performance.

Description

technical field [0001] The invention relates to a polyurethane resin and a preparation method thereof, in particular to a non-yellowing polyurethane resin for mirror surface synthetic leather and a preparation method thereof. Background technique [0002] With the deepening market competition of polyurethane resins for synthetic leather, differentiated, new and stable polyurethane resins have gradually become the object of development. This is especially true of non-yellowing polyurethane resins for high value-added mirror-finished synthetic leathers. [0003] Chinese patents CN101381447B, CN102276783B, CN101857721A, CN102718942A respectively disclose methods for preparing non-yellowing polyurethane resins, all of which are prepolymerized and then extended with aliphatic or cycloaliphatic diamines, but the diamines used are all For the dibasic primary amine. When preparing the non-yellowing polyurethane resin for mirror-finished synthetic leather, a small amount of insolub...

AI Technical Summary

Problems solved by technology

When preparing non-yellowing polyurethane resin for mirror surface synthetic leather, a small amount of insoluble particles or partial gel will be produced, which reduces the production stability and quality of the product

[0004] In addition, the intermolecular force of non-yellowing polyurethane resin is relatively weak, and the anti-adhesive property of the mirror synthetic leather prepared by it is relatively poor, and the polyurethane resin for mirror synthetic leather has poor low-temperature folding resistance due to its relatively high 100% modulus. , these problems have limited the development of polyurethane resin for mirror synthetic leather

Images