Trans-1, 4-structured butadiene-isoprene copolymer rubber and preparation method thereof

Abstract

A trans-1, 4-structured butadiene-isoprene copolymer rubber and a preparation method thereof. A Ziegler-Natta catalytic system containing MgCl2 loaded titanium and an organic aluminium compound is used to catalyze butadiene and isoprene for copolymerization synthesis of the butadiene-isoprene copolymer with trans 1, 4-structure greater than 90%; and the copolymer rubber comprises, by molar fraction, 20-99.5% of an isoprene unit and 0.5-80% of a butadiene unit. One preparation method of the trans copolymer rubber is by maintaining a feeding ratio of butadiene to isoprene, and catalyzing butadiene and isoprene for copolymerization synthesis of trans copolymer rubber with gradient composition at 0-90 DEG C. A second preparation method of the trans copolymer rubber is by maintaining the concentration of butadiene in reaction materials, and catalyzing butadiene and isoprene for copolymerization synthesis of trans copolymer rubber with relatively uniform composition at 0-90 DEG C. The trans copolymer rubber has characteristics of low heat, good abrasion resistance and excellent flex and fatigue resistant performance, and is suitable rubber products for dynamic usage.

Description

technical field

[0001] The invention belongs to the field of synthetic rubber materials, in particular to a preparation method of trans-1,4-structure polydiene copolymerized rubber and the trans-1,4-structured polydiene copolymerized rubber prepared by the method. Background technique

[0002] Diene polymers with trans-1,4-structure can be applied to high-performance tire compounds due to their excellent flex fatigue resistance, low rolling resistance, low compression heat generation and wear. Compared with cis-1,4-structured polymers, trans-1,4-structured polydienes, such as trans-1,4-polyisoprene (TPI), are crystalline plastics at room temperature and require By using a high number of sulfur (4-6 parts) or blending and vulcanizing with other rubbers to prepare elastomeric materials (ZL 95110352.0, ZL200610043556.4, Synthetic Rubber Industry, 2001, 24 (1) 25-28, Synthetic Rubber Industry 2001, 24(2)82-86, Rubber Industry, 2002, 49(3)133-137).

[0003] Copolymerization of ...

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