Method for synthesizing silyl-terminated polyether

Abstract

The invention discloses a method for synthesizing silyl-terminated polyether. The method comprises the following steps of: performing addition polymerization on alkylene oxide to an initial compound having reactive oxygen atoms by a double metal cyanide catalysis method to obtain multi-terminated polyether with the molecular weight of 1,000 to 50,000, wherein the end groups of the multi-terminated polyether are the oxygen atoms which are connected with DMC catalytic reactive groups by complexation; and removing the alkylene oxide which reacts insufficiently, adding silane with epoxy groups, performing ring-opening addition reaction on the epoxy groups under the action of the DMC catalytic reactive groups to connect the silane to the oxygen atoms at the tail ends of the polyether, and purifying to obtain the silyl-terminated polyether. On the premise of not using an isocyanate compound, the silyl-terminated polyether is obtained by two steps of reactions by the method; and the method for synthesizing the silyl-terminated polyether has the advantages of simple steps, smooth synthesis process, accordance with the requirement of environmental protection, and easy realization of industrial mass production.

Description

technical field [0001] The invention relates to a method for synthesizing polyether, in particular to a method for synthesizing a silyl-terminated polyether. Background technique [0002] Silane-terminated polyether can be used as the basic polymer of elastic sealants, elastic adhesives and coatings, and has a wide range of applications. Moreover, the elastic sealant based on silyl-terminated polyether has been widely used in developed countries such as Japan, Europe and the United States because of its excellent comprehensive performance. [0003] As the main component of elastic sealants, the research on silyl-terminated polyethers has gone through decades of development. For example, Okuno Hideichi connected the terminal allyl polyether and the hydroxyl polyether with a polyhalide to make it high in molecular weight, and then connected the hydrosilylation end to a hydrolyzable silyl group to make a silicon-modified polyether ——MS Polymer (Journal of the Japanese Society...

AI Technical Summary

Problems solved by technology

[0005] From the above studies, in addition to the MS polymer synthesized by Eiichi Okuno and the silicon-modified polyether synthesized by JP59267 (1993), other studies mostly use the polyurethane prepolymer method to prepare silyl-terminated polyether, which cannot be avoided. Isocyanate compounds cannot meet the increasingly stringent environmental protection requirements

However, the synthetic silicon-modified polyether of the MS polymer synthesized by Eiichi Okuno and JP59267 (1993) has many synthetic steps, and has strict requirements on the synthetic process parameters.