Adjustment method for molecular weight distribution of rare-earth isoprene rubber

A technology of molecular mass distribution and adjustment method, which is applied in the field of molecular mass distribution adjustment of rare earth isoprene rubber, can solve the problems of unreported synthesis processing performance, pollution of recovered solvent, and increased burden of solvent recovery unit of production equipment, etc.
CN102464745AInactive Publication Date: 2012-05-23PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2012-05-23
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

The invention relates to an adjustment method for the molecular weight distribution of a rare-earth isoprene rubber; an isoprene monomer comprises 5-20g / 100mL of hexane in concentration; a ratio of the mole number of Nd of a rare-earth catalyst to the gram of the isoprene monomer is 1*10<-7>-1*10<-6>:1, wherein the rare-earth catalyst contains a component A, i.e. neodymium naphthenate or neodymium neodecanoic acid, a component B, i.e. one or a mixture of diethyl aluminium hydride and aluminium ethyl and a component C, i.e. one of aluminium diisobutyl monochloride or aluminium diethyl monochloride; the molar ratio of A to B to C is 1:5-20:1-5; different polymer molecular weight distribution indexes MW / MN in the range of 1.90-7.80 are obtained by respectively selecting feeding modes of (A+B)+C, (A+C)+B or (C+B)+A; and according to the adjustment method, the content of a cis-1,4 structure is larger than 96.5%, and the Moony viscosity is 80+ / -5 (ML+4100 DEG C).
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Description

Technical field:

[0001] The invention relates to a method for adjusting molecular mass distribution of rare earth isoprene rubber. Background technique:

[0002] Isoprene rubber is also known as synthetic natural rubber, because its molecular structure and properties are the closest to natural rubber, it can replace natural rubber for tires and tire products, foam rubber, hoses, gaskets, medical gloves and other uses. Rare earth isoprene rubber has both the high molecular weight of lithium-based isoprene rubber, the high-cis structure of titanium-based isoprene rubber, and the same sequence configuration as natural rubber. It is structurally closest to natural rubber and is a rubber worthy of attention. Variety. However, compared with natural rubber, synthetic isoprene rubber is characterized by better extrusion and calendering properties, excellent in-mold fluidity, low hysteresis and controllable molecular weight. Compared with natural rubber, its disadvantages are: adhe...

Claims

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