Preparation method of emulsion polymerized rubber without nitroso compound

Abstract

A process for preparing the emulsion polymerization rubber (butadiene styrene rubber) not containing nitroso compound features that the components D, E and S are used as the reaction terminating agents to replace original SDD, DEHA and sodium nitrite in a defined manner. The said D is the monoalkyl or monoaryl bithioaminoformate. The said E is the hydroxyamine hydrochloride (or sulfate). The saidS is sodium sulfite or hydrated sodium sulfide.

Description

technical field [0001] The invention belongs to the field of polymer synthesis, and relates to a method for preparing emulsion polymerized rubber, that is, when the emulsion polymerization reaction is terminated, the emulsion polymerized rubber is prepared by using a substance that does not contain nitroso compounds or nitroso preparations. Background technique [0002] The production of styrene-butadiene rubber by emulsion polymerization includes under the action of redox initiator, using rosin acid soap and fatty acid soap mixed emulsifier, oxidant is dicumyl hydrogen peroxide, pinane hydrogen peroxide or p-menthane hydrogen peroxide, Sodium formaldehyde sulfoxylate and iron sodium salt of ethylenediaminetetraacetate are used as reducing agents to carry out low-temperature emulsion polymerization reaction of butadiene and styrene. A reaction terminator is added to the outlet pipeline of the polymerization reactor to terminate the polymerization react...

AI Technical Summary

Problems solved by technology

The disadvantage is that the amount of sodium sulfide is large, and the sulfur in the formula is easy to deposit on the production line, generating hydrogen sulfide and corroding equipment, and the smell of hydrogen sulfide also gives people a very unpleasant feeling.

However, when using this as a terminator, the amount of nitrosamines generated is very small, and the termination effect of the polymerization reaction is better.