Waterborne polyurethane self-extinguishing resin and preparation method thereof

Abstract

The invention relates to waterborne polyurethane self-extinguishing resin and a preparation method thereof. The waterborne polyurethane self-extinguishing resin comprises polytetramethylene ether glycol, cycloalkyl aliphatic diisocyanate, diaminosulphonate and a waterborne polyurethane associative thickener and is characterized by further comprising at least one 1,4-butanediol or 1,6-hexanediol aliphatic small molecule chain extender containing more than 4 carbon atoms or a mixture of the 1,4-butanediol and the 1,6-hexanediol aliphatic small molecule chain extenders; the diaminosulphonate is 2-[2-(aminoethyl) amino] sodium ethylsulfonate; at least two secondary amine chain extenders are taken as pre-emulsification chain extenders, and hydrazine hydrate is taken as a post-emulsification chain extender; the quantity of isocyanate is n+3; the quantity of the aliphatic small molecule chain extenders is 1 / n+3; the quantity of the 2-[2-(aminoethyl) amino] sodium ethylsulfonate is 1.05-1.25 / n+3; the quantity of diamine is 1.25-1.50 / n+3. The waterborne polyurethane self-extinguishing resin provided by the invention has the advantages of being good in self-extinguishing effect, good in emulsification stability, good in product stability and the like.

Description

technical field [0001] The invention belongs to the field of macromolecular materials, and in particular relates to a water-based polyurethane self-dulling resin and a preparation method thereof. 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 ...

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