Method for preparing aliphatic polyisocyanurate by using microreactor

Abstract

The invention discloses a method for preparing aliphatic polyisocyanurate by using a microreactor, which comprises the following steps: adding isocyanurate and a catalyst compound system formed by quaternary ammonium salt and inert alcohol solvent to enable the isocyanurate to generate a polymerization reaction; then feeding a formed material flow into a dynamic reactor for continuously carrying out a polymerization reaction; and enabling reaction solution obtained by the reaction to pass through a second-stage evaporator to obtain a polyisocyanurate product. The method can well control the reactivity of the catalyst, so that a trimerization reaction of the isocyanurate is finished under a mild condition to obtain a tripolymer product with excessively-high quality.

Description

technical field [0001] The invention relates to a preparation method of aliphatic isocyanate trimer, specifically, a method for preparing aliphatic polyisocyanurate through a microreactor. Background technique [0002] Microreactor is a kind of fluid flow channel manufactured by micromachining technology. It is a chemical reactor with a characteristic scale within hundreds of microns. In the early 1980s, Tuckerman and Pease first proposed the concept of "microchannel radiator". Successfully solved the "thermal barrier" problem faced by large-scale and ultra-large-scale integrated circuits. In the early 1990s, microreactors began to be applied in the chemical industry. Due to their good application characteristics, the concept of microchemical technology quickly aroused the strong interest and attention of experts in the chemical industry. The use of microreactors in the chemical industry is essentially a continuous flow pipeline reactor, which includes mixers, heat exchange...

AI Technical Summary

Problems solved by technology

At the same time, the yellowing resistance of the trimer in the product placement is obviously better than that of biuret and other adduct products, but in the process of preparing the trimer, there are the following problems: the catalyst is easy to remain, which affects the later application ; The obtained adduct is easy to turn yellow, which affects the performance of the later product; the product obtained from the trimer has a high viscosity, which affects the construction performance

The main problem of the trimerization reaction is that the reaction heat is too large, it is difficult to control the reaction process, and there are too many additional catalysts and additives. Undesirable by-products, and in the post-processing process, these trace components cannot be eliminated, thereby affecting the application properties of the final trimer