Wanhua Chemical Group Co., Ltd.

Wanhua Chemical (Ningbo) Co., Ltd.

Nuancheng Wang

Bin Shi

Yonghua Shang

Yuan Li

Yuqi Wang

Chengyue Yan

Zhicheng Zhu

Weiqi Hua

Wei Liu

Lidong Sun

Bing Zheng

Li Li

Haijun Li

Hefu Li

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

The present application provides a storage-stable polyisocyanate composition and a preparation method. The polyisocyanate composition is obtained by selecting one or more diisocyanate from aliphatic diisocyanates and alicyclic diisocyanates, and reacting same with an alcohol compound; the polyisocyanate composition contains an isocyanurate group, a uretdione group, a carbamate group, and an allophanate group; within the polyisocyanate composition, the molar ratio of the carbamate group/(uretdione group+isocyanurate group) is 0.01-0.2, and preferably 0.01-0.1. Compared to existing techniques, the present application has the advantage of a noticeable increase in system viscosity of uretdione polyisocyanate during storage. With the present application, by means of controlling the ratio of the carbamate group/(uretdione group+isocyanurate group) within the system, the increase in viscosity of a product during storage is inhibited, thereby improving the storage stability of the product.

Storage-stable polyisocyanate composition and preparation method

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

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Shandong, China

Nuancheng Wang