Preparation method of self-extinction resin

Abstract

The invention relates to a preparation method of a self-dulling resin, which consists of polytetramethylene ether glycol, cycloalkyl aliphatic diisocyanate, isophorone diisocyanate or 4,4'-dicyclohexylmethane diisocyanate One or two kinds of mixture, diaminosulfonate, water-based polyurethane associative thickener, catalyst, deionized water, one or two of 1,4-butanediol or 1,6-hexanediol The mixture, the diaminosulfonate is 2‑[(2‑aminoethyl) amino] sodium ethanesulfonate, at least two secondary amine chain extenders and hydrazine hydrate, adopt stepwise reaction to achieve molecular structure design, and prepare The water-based polyurethane resin particles with "soft core and hard shell" structure form a special hollow microsphere structure; it has the advantages of good emulsification stability, low technical requirements for emulsification process, good product stability, and good extinction effect.

Description

technical field [0001] The invention belongs to the field of macromolecular materials, in particular to a preparation method of water-based polyurethane self-dulling resin. The invention is suitable for finishing agent of leather and synthetic leather. Background technique [0002] At present, domestic preparation methods for water-based polyurethane coating agent matting resin are mainly divided into two types: one is to add water-based matting fillers, such as fumed silica, etc. on the basis of water-based polyurethane coating agent, and produce The matting effect can achieve the ultimate goal; the other is to design a special molecular structure or emulsion particles. During the drying process, due to the change of particle shape and the water-solubilization of different groups in the process, a rough surface is produced. To achieve the matting effect of the coating film. For example, the patent application number is CN201110404622.7 "Water-based polyurethane finishing ...

AI Technical Summary

Problems solved by technology

The disadvantage is that the rigidity of the latex particles is not enough. In the process of emulsification, post-chain extension and drying, it is easy to deform the spherical particles due to the micro-stress caused by acetone and water volatilization, which leads to the failure of the matting effect, and eventually forms a high Glossy coating

Moreover, this preparation technology has extremely high requirements for the emulsification of prepolymers, poor production repeatability, and insufficient industrial quality stability