Preparation method of polyether polyol for rapid demoulding rigid polyurethane foams

Abstract

Belonging to the technical field of polyether polyol synthesis, the invention specifically relates to a preparation method of polyether polyol for rapid demoulding rigid polyurethane foams. The method includes: taking solid sorbitol, trimethylolpropane and triethanolamine as the composite initiator, adopting a compounded system of a trimethylamine aqueous solution and DMP-30 as the catalyst, adding oxyalkylene to carry out polymerization and end capping reaction, and finally carrying out demonomerization and drying to obtain the polyether polyol for rapid demoulding rigid polyurethane foams. The polyether polyol prepared by the method provided by the invention has higher flowability, strength and dimensional stability, the rigid foam composite material prepared therefrom and isocyanate react to generate foams with the characteristics of fast curing and short demoulding time, thus greatly improving the production efficiency and saving energy. And compared with existing amidogen ether system composite materials using a special amine initiator, the cost is lower, thereby meeting the high standard requirements of energy saving, consumption reduction, and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of polyether polyol synthesis, and in particular relates to a preparation method of polyether polyol for rapid release polyurethane rigid foam. Background technique [0002] Polyether polyol is one of the main raw materials of the polyurethane industry, which can be used in the manufacture of automotive interiors, medical equipment, furniture, home appliances, coatings, shoe leather and other fields. In polyurethane industrial products, different varieties have different requirements for the molecular weight, functionality and activity of the raw material polyether polyol. In the production of polyurethane flexible foam, the polyether polyol is generally required to have a functionality of 3 and a molecular weight of 3000. Even higher, and in order to shorten the mold opening time and reduce the mold temperature to save energy in polyurethane molded flexible foam products, it is often required to use polyeth...

AI Technical Summary

Problems solved by technology

In polyurethane industrial products, different varieties have different requirements for the molecular weight, functionality and activity of the raw material polyether polyol. In the production of polyurethane flexible foam, the polyether polyol is generally required to have a functionality of 3 and a molecular weight of 3000. Even higher, and in order to shorten the mold opening time and reduce the mold temperature to save energy in polyurethane molded flexible foam products, it is often required to use polyether polyols with high activity, that is, high primary hydroxyl content, and the primary hydroxyl content is 70%. Above, the production process of cold molding requires more active polyether polyols. The primary hydroxyl content of the most commonly used high-primary hydroxyl polyether polyols is 75-80%; for the production of polyurethane rigid foam, polyether polyols are generally required. The functionality of alcohol is greater than 4, and the molecular weight is about 400-700. In order to improve production efficiency and save energy, various manufacturers also require a short mold opening time in the production process. At present, polyether polyols generally use high functionality, high The polyether system with hydroxyl value, even with the amine ether with special amines as the initiator, will not only affect the fluidity of the foam but also increase the production cost by using amine ether, while the use of primary hydroxyl groups in the production of flexible foam There are few reports on the patented technology of high-end highly active polyether

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