Method for synthesizing polyether polyol

Abstract

The invention provides a method without an after-treatment process for synthesizing a novel polyether polyol which has a good intersolubility with a hydrocarbon foaming agent. A synthesis process of the invention adopts an amine complex catalyst system, has the advantages of high reaction activity, short production cycle, no need of an after-treatment process and low production cost. Meanwhile the invention overcomes the problem of inactivation of a pure amine catalyst in the later reaction, and can synthesize polyether polyol with relatively high molecular weight and low hydroxyl value. Compared with a polyether polyol for common hard foam, the polyether polyol synthesized in the invention has a good intersolubility with the hydrocarbon foaming agent, such as n-pentane, cyclopentane, isopentane and a mixture of n-pentane, cyclopentane and isopentane. The composite material prepared can realize transparency at a low temperature, and can meet the requirements of long-term storage by customers.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, and in particular relates to a synthesis method of polyether polyol. Background technique [0002] Polyether polyol is the main raw material for the production of rigid polyurethane foam. Its preparation method is to polymerize the initiator with active hydrogen and epoxide under certain pressure, temperature and catalyst. Commonly used starters are glycerol, propylene glycol, pentaerythritol, trimethylolethane, sorbitol, mannitol, sucrose, and amine compounds, such as ethylenediamine; the epoxide is usually propylene oxide. For example, the starter used in the production of sucrose polyether polyols is a mixed starter of glycerol and sucrose, triethanolamine, ethylenediamine, toluenediamine and sucrose, diethanolamine and sucrose; the current production of sorbitol polyether polyols The starters used include mixed starters such as glycerol and sorbitol, triethanolamine and sorbitol, ethylenedi...

AI Technical Summary

Problems solved by technology

The traditional polyether polyol synthesis process uses KOH as a catalyst, and requires a post-treatment process for removing potassium ions. The production cycle is long and the cost is high. Some synthesis processes use dimethylamine as a catalyst, although no post-treatment process for removing potassium ions is required. However, due to the gradual inactivation of dimethylamine in the later stage of the polymerization reaction, it is only suitable for the synthesis of polyether polyols with lower molecular weight and higher hydroxyl value

Moreover, common polyether polyols and hydrocarbon blowing agents, such as n-pentane, cyclopentane, isopentane and their mixtures, have poor miscibility, and are prone to delamination during use, which seriously affects the performance of the produced polyurethane foam.