US 8,940,838 B2 · Polyisoprene, preparation method thereof, polyisoprene rubber compounds and vulcanizate therefrom

Polyisoprene, preparation method thereof, polyisoprene rubber compounds and vulcanizate therefrom

AssigneesChina Petroleum & Chemcial Corporation, Beijing Research Institute of Chemical Industry, China Petroleum & Chemical Corporation

InventorsAimin Liang, Jie Zhang, Jiangwei Zhao, Chuanqing Li, Lin Xu, Ximing Xie, Guozhu Yu, Sufang Ouyang, Jinmei Tan, Liangliang Yang, Wei Sun, Yishuang Xin

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Abstract

The method for preparation of polyisoprene includes conducting polymerization reaction of isoprene in a first organic solvent under the presence of rare earth catalyst I and rare earth catalyst II, to obtain polyisoprene with bimodal molecular weight distribution, wherein the polymerization reaction conditions are controlled to ensure the peak molecular weight of the high molecular weight component fraction in the polyisoprene is 1×106-2×106 and the peak molecular weight of the low molecular weight component fraction is 2×105-4×105, and the weight ratio of content of the high molecular weight component fraction to the low molecular weight component fraction is 1-25:1. The molecular weight distribution of the polyisoprene obtained with the method provided is bimodal distribution; therefore, the polyisoprene not only has the mechanical properties of polyisoprene with high molecular weight, but also has the processability of polyisoprene with low molecular weight.

Claims20

Dependent claims

A polyisoprene, which possesses bimodal molecular weight distribution as measured in GPC test, the peak molecular weight of high molecular weight component fraction is 1×106-2×106, the peak molecular weight of low molecular weight component fraction is 2×105-4×105, and the weight ratio of the high molecular weight component fraction to the low molecular weight component fraction is 1-25:1.

A preparation method of polyisoprene comprising conducting polymerization reaction of isoprene in a first organic solvent under the presence of rare earth catalyst I and rare earth catalyst II, to obtain polyisoprene with bimodal molecular weight distribution, wherein the polymerization reaction conditions are controlled to ensure the peak molecular weight of the high molecular weight component fraction in the polyisoprene is 1×106-2×106 and the peak molecular weight of the low molecular weight component fraction is 2×105-4×105, and the weight ratio of the high molecular weight component fraction to the low molecular weight component fraction is 1-25:1;

the rare earth catalyst I is obtained by contacting materials A, B and D with each other in a second organic solvent and treating them through a first aging process, and then adding material C and treating through a second aging process;
the rare earth catalyst II is obtained by contacting materials A, C and D with each other in a third organic solvent and treating them through a third aging process, and then adding material B and treating through a fourth aging process;
wherein, material A is neodymium carboxylate, material B is an aluminum alkyl compound, material C is a halogen-containing compound, and material D is conjugated diene;
the first aging process, second aging process, third aging process, and fourth aging process are carried out under the same conditions or different conditions.

1 more element

Dependencies are inferred from the claim text.