A kind of method utilizing microchannel reactor to prepare polyether polyol

Abstract

The invention discloses a method of using a microchannel reactor to prepare polyether glycol. Active hydrides are used as the initiator. Alkene oxide is used as the raw material. Bi-metal cyanide is used as the catalyst. The synthesis reaction process of the polyether glycol with the number-average molecular weight of 700-1000 is completed in the micro-channel reactor. The polyether glycol product prepared by using the method has a relatively narrow distribution of molecular weights, the degree of unsaturation of the product is low, and no tailing peak is generated.

Description

technical field

[0001] The invention belongs to the field of polyether preparation methods, and in particular relates to a method for preparing polyether polyols by using a microchannel reactor. Background technique

[0002] Polyether polyol is an important raw material in the production of polyurethane. It is generally composed of an initiator containing polyhydric alcohol and epoxides such as ethylene oxide, propylene oxide, and butylene oxide through addition polymerization in the presence of a basic catalyst. be made of. Basic catalysts generally use potassium hydroxide, sodium hydroxide, etc. This type of catalyst mainly catalyzes the ring opening of epoxy olefin anions. The disadvantage is that it is easy to form unsaturated bonds in the process of preparing polyether polyols with a number average molecular weight greater than 1000. The presence of these unsaturated bonds reduces the functionality of polyether polyols, which adversely affects the hardness and mechanic...