Unsaturated polymer hydrogenation catalyst and preparation method thereof

Abstract

The invention provides an unsaturated polymer hydrogenation catalyst and a preparation method thereof. The unsaturated polymer hydrogenation catalyst is formed by reacting metal organic compounds of IA, IIA and IIIA groups with a nickel / cobalt metal inorganic salt, wherein the metal mol ratio of organic metal to inorganic metal is (1-10): 1. The hydrogenation effect of the catalyst on a homopolymer of conjugated diene or a copolymer of the conjugated diene and vinyl arene is obvious, the hydrogenation selectivity of the catalyst is high and the catalyst is not easily remained in the polymer after a hydrogenation reaction and can be washed by water, so that the catalyst is good for improving the purity and the quality of the polymer.

Description

technical field [0001] The invention relates to an unsaturated polymer hydrogenation catalyst and a preparation method thereof. Background technique [0002] Some polymers, such as homopolymers of conjugated dienes or copolymers of conjugated dienes and vinyl aromatics, have unsaturated double bonds in the molecular structure, and the unsaturated bonds in the polymer are sensitive to light, oxygen, ozone, Environmental factors such as heat are intolerable, that is, when unsaturated double bonds are affected by environmental factors such as light, oxygen, ozone, and heat during use, they will gradually break or oxidize, resulting in accelerated aging of polymers and affecting polymer products. For this reason, many inventors have developed some effective polymer hydrogenation catalysts, especially for the hydrogenation of homopolymers of conjugated dienes or copolymers of conjugated dienes and vinyl aromatics Catalyst and its hydrogenation process and method. [0003] Hydro...

AI Technical Summary

Problems solved by technology

The disadvantage of this type of catalyst is that the activity of the catalyst is closely related to the high dispersion of the catalyst metal on the carrier, and thus affects the rate of the catalytic hydrogenation reaction. Generally speaking, the hydrogenation efficiency of heterogeneous catalysts is relatively low; two. The conditions for the catalytic hydrogenation reaction are relatively harsh, and the reaction conditions of high temperature and high pressure will inevitably cause the decomposition of the polymer and the formation of the polymer gel in the system, which will affect the performance; the third is that the amount of the catalyst used is relatively high; the fourth is the hydrogenation reaction. The selectivity is low, and the benzene ring structure of the polymer will be difficult to maintain intact, thus affecting the performance of the polymer after hydrogenation

All of these catalysts use organic nickel compounds. After the hydrogenation reaction of the polymer is completed, in order to ensure the quality of the polymer products, the catalyst metal must be removed by various effective methods, and the organic acid combined with nickel in the catalyst is in the polymerization process. Residue in the substance, affecting the purity and quality of the polymer