A kind of preparation method of halogenated polymer

Abstract

The invention provides a method for preparing a halogenated polymer. The method comprises the following steps: a) a polymer and a halogenation agent are contacted under existence of an organic solvent and an initiator, partial hydrogen atoms in the polymer are substituted by halogen atoms to obtain a halogenation polymer solution containing halogen hydride and the initiator; and b) the halogenation polymer solution obtained in the step a) and alkali lye are fully mixed under supersonic wave effect to remove halogen hydride and the initiator. According to the method, dehalogenation and discoloration of the halogenated polymer product in a subsequent drying process are effectively inhibited; technical condition and process are simple and easy, and the pure halogenated polymer product which is not easy to fad is provided.

Description

technical field

[0001] The present invention relates to the field of preparation of halogenated polymers. Background technique

[0002] Brominated isobutylene and p-methylstyrene copolymer (BIMS) is a new elastomer material with vulcanization activity and better overall performance than brominated butyl rubber due to the fully saturated structure of the main molecular chain. When preparing halogenated rubber such as halogenated isobutylene / p-methylstyrene copolymer by solution polymerization, a halogenated polymer solution containing hydrogen halide and initiator is produced. Usually neutralized by aqueous alkali solution, washed with water, and dried to obtain dehydrated particles (containing <10-20wt% water). In the research, it is found that whether the halogenated polymer product is dried in an open mill (110°C) or vacuum-dried in a vacuum oven without heating, as long as the water content in the rubber drops to a certain level, the halogenated rubber will Discolora...