Preparation method for flexible foam polyether polyol for low-density sponge

Abstract

The invention belongs to the field of polyether polyol synthesis technologies, and particularly relates to a preparation method for flexible foam polyether polyol for low-density sponge. Only neosorb is used as an initiator, and the polyether polyol is prepared through the two-stage polymerization technique. The preparation method provided by the invention has the advantages that the degree of functionality of the prepared polyether polyol reaches 6, the molecular weight of the prepared polyether polyol can reach between 10,000 and 14,000, and the prepared polyether polyol has the characteristics of low degree of unsaturation and narrow molecular weight distribution, so as to solve the problem of subsequent reaction inactivation of conventional catalysts; moreover, compared with the traditional polyether polyol used for low-density sponge products, the polyether polyol prepared through the invention achieves a lower density as well as higher operation tolerance, dimensional stability, flexibility and the like, so that the application range is wider, and the application requirement for high-quality low-density sponge is met.

Description

technical field [0001] The invention belongs to the technical field of polyether polyol synthesis, and in particular relates to a preparation method of soft foam polyether polyol for low-density sponges. Background technique [0002] With the gradual growth of the national economy and the gradual improvement of people's living standards, consumers' requirements for furniture products are gradually increasing, which to a certain extent promotes the demand for sponge products prepared from special polyether polyols. The high-molecular-weight polyether polyols prepared by traditional KOH catalysts have poor performance due to side reactions in the polymerization process. In recent years, low-unsaturation, three-functional high-molecular-weight propylene oxide polyols prepared by bimetallic catalytic systems Polyols can meet the sponge needs of conventional customers, but there is no obvious breakthrough for low-density, high-quality, high-resilience products that require high p...

AI Technical Summary

Problems solved by technology

The high-molecular-weight polyether polyols prepared by traditional KOH catalysts have poor performance due to side reactions in the polymerization process. In recent years, low-unsaturation, three-functional high-molecular-weight propylene oxide polyols prepared by bimetallic catalytic systems Polyols can meet the sponge needs of conventional customers, but there is no obvious breakthrough for low-density, high-quality, high-resilience products that require high performance in terms of operating latitude, dimensional stability, and elasticity.

[0003] Solid sorbitol is used as a high-functionality starter, and the prepared rigid polyether polyol can effectively improve the fineness of the cells and improve the dimensional stability of the foam. However, the polyether polyol suitable for sponge products must also have high molecular weight, lower molecular weight distribution, better porosity, but solid sorbitol used alone as a starter to prepare high molecular weight flexible polyether products has not been reported, while the traditional process can not achieve high molecular weight, low Polymerization of saturated specialty polyethers

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