Process for preparing nickel series low mooney viscosity high cis-1, 4,-polybutadiene rubber

Abstract

The preparation process of nickel-based low Mooney high-cis 1,4-polybutadiene rubber is a solution polymerization reaction of 1,3-butadiene in a polymerization solvent, and the catalyst is a nickel-based catalyst. The nickel-based The catalyst is a Ni-Al-B three-way catalyst. The main technical feature is to add a molecular weight regulator D in the polymerization system. D can be a hydroxyl-containing compound or an olefin. By adjusting its addition amount and adjusting the Al / B ratio Prepare a low Mooney butadiene rubber with a Mooney viscosity of 25 to 40. At the same time, add a coupling agent C to the polymerization system. C is a divinyl compound, so that the prepared low Mooney butadiene rubber maintains a high tensile strength. It achieves the same strength as butadiene rubber with a Mooney viscosity of 40-50, and has a lower gel content, less than 0.5%.

Description

technical field [0001] The invention belongs to the field of polymer synthesis, and relates to a preparation method of low Mooney value and high cis-1,4-polybutadiene rubber. Background technique [0002] The preparation method of high-cis 1,4-polybutadiene rubber (referred to as butadiene rubber for short) generally adopts the solution polymerization method, and uses cobalt series, titanium series, nickel series and rare earth series as catalyst systems to make 1,3-butadiene Alkene (abbreviated as Bd) polymerization, the nickel-based catalyst used in industrial production is Ni-Al-B three-way catalyst, Ni refers to nickel carboxylate salts such as nickel naphthenate, nickel acetate, nickel octanoate, and Al refers to triisobutyl aluminum Or triethylaluminum, B refers to boron trifluoride ether complex or boron trifluoride butyl ether complex, the polymerization solvent is saturated aliphatic hydrocarbons, aromatic hydrocarbons, cycloalkanes or ...

AI Technical Summary

Problems solved by technology

[0006] The molecular weight of the polymer directly affects the tensile strength of the polymer. Generally, the decrease of the molecular weight of the polymer will reduce the tensile strength of the polymer.

The disadvantage of the low molecular weight polybutadiene prepared by the above-mentioned technology is that the polybutadiene molecular weight is reduced while causing the decline of the polymer strength, and all published patents have no reports on how to improve the strength of the low Mooney butadiene rubber