Polyether carbonate polyol and preparation method thereof

Abstract

The invention provides polyether carbonate polyol and a preparation method thereof. Aiming at the problems that cyclic carbonate is difficult to open a ring, the decarboxylation reaction is difficultto control and the like, the polyether carbonate polyol with controllable carbonate unit content is effectively prepared by a method of combining a tin catalyst and an organic catalyst. The interaction of the organic catalyst and a metal catalyst can effectively reduce the activation energy of the ring-opening polymerization reaction, which is the main reason for realizing the process, and the interaction enables the reaction to occur under a relatively low temperature condition, so that the effective control of the content of carbonate in the structure is realized. The end group of the polyether carbonate polyol prepared by the method is completely a primary hydroxyl group, and the content of a carbon dioxide unit in the structure is 15.2 wt%-35.5 wt%.

Description

technical field [0001] The invention relates to the technical field of polymers, in particular to a polyether carbonate polyol and a preparation method thereof. Background technique [0002] Oligomer polyol is one of the three major raw materials (oligomer polyol, isocyanate, and chain extender) in the polyurethane material industry. According to different main chain structures, oligomer polyols are mainly divided into three categories: polyether polyols, polyester polyols and polycarbonate polyols, among which polyether polyols are used in the largest amount, accounting for about 90% of all polyols. %about. The polyurethane made of it has good flexibility and low temperature performance, and because the ether bond is not easily hydrolyzed, it has good hydrolysis resistance. Polyester and polycarbonate polyurethanes have good tensile properties, abrasion resistance and solvent resistance. How to prepare polyol materials with both advantages has always been an important di...

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Problems solved by technology

[0003] However, this novel polyol with carbon dioxide as a raw material also has a lot of problems in the application process, which is mainly reflected in two aspects: (1) the polyol has poor reactivity, because propylene oxide is mainly used as a raw material in the synthesis process, Therefore, the terminal hydroxyl groups of the prepared polyols are mainly secondary hydroxyl groups, resulting in low activity of polyols when they react with isocyanates, especially when they are used in fields such as polyurethane foams that require high activity.

(2) The performance of polyurethane materials is insufficient. Due to the high glass transition temperature of this type of polyol, the polyurethane materials prepared by it have problems such as poor low temperature resistance and insufficient toughness. The existence of these problems greatly limits its application range

In addition, because the reaction uses propylene oxide and other low-boiling, flammable compounds, the safety requirements in the industrial production process are relatively high, which also increases the production cost of materials.

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