What is the effect of dibenzoyl peroxide

Dibenzoyl peroxide is used as an initiator for polyvinyl chloride and unsaturated polyesters. It is most widely used in industry as an initiator, natural rubber, or bleaching agent and oxidant. Especially in recent years, it has been widely used in highway projects. So after understanding its uses and characteristics, we should have a correct understanding of it.

1. Introduction

Dibenzoyl peroxide, white crystals. Soluble in benzene, chloroform and ether. Slightly soluble in ethanol and water. It can be used as a polymerization initiator for monomers of polyvinyl chloride, unsaturated polyesters, polyacrylates, etc. It can also be used as a cross-linking agent for polyethylene and a rubber vulcanizing agent.

2. Preparation method

Under cooling conditions, 30% hydrogen peroxide is added to a 30% sodium hydroxide solution to generate a sodium peroxide solution; then benzoyl chloride is added dropwise with stirring at 0-10°C. Too high a temperature will cause decomposition of hydrogen peroxide and hydrolysis of benzoyl chloride; the benzoyl peroxide generated by the reaction is precipitated, cooled, filtered, washed, and recrystallized with 2:1 methanol/chloroform and dried (50-70°C) to obtain the product with a yield of more than 85%.

3. Application

1. Benzoyl peroxide is the most widely used initiator in the adhesive industry. It is used as an initiator for the polymerization of acrylates and vinyl acetate solvents, the graft polymerization of chloroprene rubber, natural rubber, SBS and methyl methacrylate, the curing of unsaturated polyester resins, and organic glass adhesives. It can also be used as a vulcanizing agent and cross-linking agent for silicone rubber and fluororubber. It can also be used as a bleaching agent and an oxidizing agent.

2. Powder products are mainly used as polymerization initiator catalysts for acrylic resins, MMA resins, etc. In recent years, it is being promoted as a fast adhesive in highway projects and other aspects, and the paste-type product is used as a curing catalyst in polyester resin molding processing. The liquid type is used as a polymerization catalyst to prepare polystyrene resin.

3. Mainly used as polymerization initiator for PVC and polyacrylonitrile and crosslinking agent for unsaturated polyester and acrylate. In the rubber industry, it is used as a crosslinking agent for silicone rubber and fluororubber. It can also be used as a bleaching agent, oxidant, and in chemical production.