Wanhua Chemical Group Co., Ltd.

Wanhua Chemical (Ningbo) Co., Ltd.

Binzhou Medical University

Yuqi Wang

Weiqi Hua

Yuan Li

Bin Shi

Yonghua Shang

Lidong Sun

Nuancheng Wang

Wei Liu

Zhicheng Zhu

Chengyue Yan

Hefu Li

Zikai Geng

Shaoping Wang

Long Dai

Jiayu Zhang

Weijing Fan

The present invention provides an isocyanurate-containing polyisocyanate composition with stable chromaticity, and a preparation method thereof, belonging to the technical field of polyisocyanate composition preparation. The preparation method comprises: an isocyanate monomer being polymerized in the presence of a catalyst, after the reaction is terminated, obtaining a prepolymer, subjecting the prepolymer to separation treatment and heat treatment, and obtaining the polyisocyanate composition containing isocyanurate; based on the weight of the polyisocyanate composition, the cleavable amine content of the polyisocyanate composition is less than or equal to 20 ppm. By means of controlling the cleavable amine content of the polyisocyanate composition, the present invention causes the resulting isocyanurate-containing polyisocyanate composition to have stable storage chromaticity, and the present invention has a chrominance increase of ≤10 Hazen when stored at 40° C. for 12 months.

Isocyanurate-containing polyisocyanate composition with stable chromaticity, and preparation method thereof

Provided is a fermentation fungal substance ofand its use. The fermentation fungal substance is obtained by solid fermentation withpowder as a fermentation substrate andas a fermentation strain. The fermentation fungal substance ofin the present disclosure plays a significant role in treating hyperuricemia and/or hypertriglyceridemia.

Fermentation fungal substance of astragalus membranaceus paecilomyces cicadae and its use

An isocyanate polymerization catalyst, a preparation method thereof and a method for preparing polyisocyanates comprising isocyanurate groups by using the same. The catalyst is a carboxylic acid salt containing a di-quaternary ammonium ion. The structure of the catalyst contains hydroxyl-containing aromatic heterocyclic residues. The catalyst is highly active. Only a small quantity of the catalyst is required for the polymerization of isocyanates. The prepared polyisocyanates have color values lower than 25 Hazen, monomer contents of less than 0.5% by weight, high contents of isocyanurates and low viscosities.

Isocyanate polymerization catalyst, preparation method thereof, and method for preparing polyisocyanate by using same

Disclosed is an imine-type quaternary ammonium salt catalyst, wherein the catalyst has a general structure formula shown by formula I below; in the formula, R1 and R2, respectively, are independently selected from a C1-C20 linear alkyl or a branched C3-C20 alkyl, and a C1-C20 hydroxylalkyl, a C3-C8 cycloalkyl, and arylated alkyl; R3 is a linear or branched alkyl, cycloalkyl or aryl; and R4 is hydrogen, aryl, a linear C1-C15 alkyl or branched C3-C15 alkyl. Also disclosed are a method for preparing the catalyst and a polyisocyanate composition prepared therefrom. The catalyst, by introducing an imine structure, on the basis of ensuring high catalytic activity thereof, is allowed to have properties of high temperature decomposition and inactivation, and when applied to the synthesis of polyisocyanate, can effectively prevent the risk of explosive polymerization caused by an uncontrolled reaction.

Imine-type quaternary ammonium salt catalyst, preparation method thereof and use thereof for preparation of polyisocyanate composition

Growing community of inventors

Shandong, China

Yuqi Wang