Rare earth catalyst for preparing polyisoprene and preparation method and method for preparing polyisoprene

Abstract

This invention belongs to rare earth catalyzer for preparing polyisoprene, and its preparation method. This catalyzer is composed by carboxylic acid neodymium, aluminium alkyl, chloride, conjugated diolefine. Mixture ratio of aluminium alkyl, chloride, conjugated diolefine,and carboxylic acid neodymium is 5 - 30:1.0 -4.0:5 - 20:1. This invention could obtain homogeneous phase and stable rare earth catalyzer. This catalyzer possess higher catalytic activity, trigger off isoprene polymerization at higher polymerization temperature, obtain polyisoprene that has high content of syn- 1, 4 structure( not less than 96 percent) and narrow molecular weight distribution ( less than 3.0), and possess tensile crystallinity trait.

Description

technical field

[0001] The invention belongs to a rare earth catalyst for preparing polyisoprene, a preparation method and a method for preparing polyisoprene. Background technique

[0002] Isoprene rubber can be obtained by polymerizing isoprene with a rare earth catalyst. (Anthology of Rare Earth Catalyst Synthetic Rubber 1980, Science Press, 70-82) mentions catalysts composed of rare earth chloride complexes and alkylaluminum, rare earth carboxylates or phosphorus / phosphonates, alkylaluminum and chloride The catalyst composed of alkylaluminum can synthesize polyisoprene with a cis-1,4 structure content of 93-95%, but its performance is not as good as that of titanium-based isoprene rubber, and far less than that of natural rubber.

[0003] Polyisoprene with high cis-1,4 structure content (≥96%) and narrow molecular weight distribution (distribution index <3.0) has excellent performance, which is superior to titanium-based isoprene rubber, close to natural rubber, and ...

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