High solid content aqueous polyurethane and preparation method thereof

Abstract

The invention discloses a highly solid aqueous polyurethane, which comprises the following steps: 45-50g toluene diisocyanate, 90-100g polycarbonate, 3-5g neopentyl glycol, 20-30g polyester polyol and 100-120g water. The making method comprises the following steps: adding polycarbonate, neopentyl glycol and toluene diisocyanate; heating to 70 deg. c for 1-1. 5h; heating to 85deg. c for 2-3h; cooling to 65deg. c; adding aryl thiophene sodium polyester polyol; reacting at 60 deg. c for 2-3h; measuring NCO value to reach the prepolymer; adding water in the emulsifying autoclave; stirring under low speed; adding the prepolymer in the emulsifying autoclave to emulsify 3-4h; obtaining the product.

Description

technical field [0001] The present invention relates to a kind of resin, more specifically relates to a kind of waterborne polyurethane with high solid content. Background technique [0002] Water-based polyurethane is a kind of "green material" with excellent performance. The solid content is an important indicator. We know that the solid content is the percentage of the remaining part of the emulsion or paint after drying under specified conditions; it is also called non-volatile matter. Content, solid content is not only film-forming substances, but also fillers, additives, etc. The level of solid content has an important impact on production efficiency, transportation costs, performance and other indicators, and high solid content affects the performance of waterborne polyurethane to a certain extent , Ordinary water-based polyurethane has low multi-solid content, high cost and poor adaptability. Therefore people have been engaged in the research of high solid content w...

AI Technical Summary

Problems solved by technology

However, its use requires high water quality, an