Rubber vulcanizing agents are dust-free, environmentally friendly, and non sticky at room temperature, making them easier to feed and weigh. Elastomers have good compatibility with various rubbers, and the Mooney viscosity of mixed rubber is low, which can improve dispersion and shorten mixing time. Can be used for tires, shoe soles, conveyor belts, rubber hoses, transparent and colored products. Ordinary sulfur can dissolve in rubber, but when added in large quantities, it cannot dissolve in rubber at low temperatures and will precipitate on the surface of the rubber material, causing frost, affecting molding and vulcanization.
Ordinary sulfur polymerizes into macromolecular sulfur, which is insoluble in rubber, hence it is also known as insoluble sulfur. Insoluble sulfur exists in the rubber material in the form of sand crystals during the rubber mixing process, which can prevent frost formation, prevent sulfur migration, and maintain good molding viscosity of the rubber material. Insoluble sulfur is unstable and can be reduced to ordinary sulfur at the same high temperature as the vulcanization temperature of the rubber material, thus completing vulcanization. Therefore, the application of tires and products is expanding.
Sulfur donors are sulfur compounds that can release active sulfur at vulcanization temperature. They have been widely produced in China and are used in tires and products. In addition, there are also thiram disulfides and polysulfides, alkylphenol sulfides, and sulfur-containing polymers. Halogenated rubber, natural rubber, and butadiene styrene rubber can be vulcanized with alkylphenols. Firstly, polysulfide alkylphenol vulcanizing agents have been introduced domestically, and the alkylphenol groups in them are beneficial for increasing the viscosity of the mixed rubber and will not spray frost in the mixed rubber. Vulcanized rubber has good resistance to sulfur reversion and improved heat and oxygen aging properties. Especially, this product is not prone to clumping and can be used as a vulcanizing agent for chlorinated butyl, natural rubber blends, brominated butyl rubber, butadiene styrene rubber, and rubber blends, enabling different rubbers to have matching co vulcanization properties. It is also an ozone resistant agent for white sidewall rubber. These vulcanizing agents can also be used as auxiliary crosslinking agents for natural rubber and styrene butadiene rubber emulsions, vulcanizing agents for chloroprene rubber and phenolic resin adhesives, and providing antioxidant functions.
Unsaturated rubber vulcanizing agents usually use the following vulcanization systems. Sulfur, organic disulfides and polysulfides, thiazole, diphenylguanidine, zinc oxide, and stearic acid are the main sulfides. This is a common vulcanization system. However, the heat and oxygen aging performance of vulcanized rubber is not high. Alkyl phenolic resin. Polyhalide hexachloro-p-xylene. Dual functional reagents, etc. Bismaleimide, diacrylate. Divalent metal acrylate, pre polyether acrylate. Organic peroxide used for vulcanizing saturated rubber.
Saturated rubber. When vulcanizing different types of saturated rubber, different vulcanization systems can be used. Rubber containing halogen atoms or functional groups, chloroprene rubber, chlorosulfonated polyethylene, and chlorinated butyl rubber are commonly used chlorinated rubbers. Rubber vulcanizing agent promoter, the following vulcanization system can be used for vulcanizing chlorosulfonated polyethylene. A mixture of aluminum oxide, lead oxide, magnesium oxide, and magnesium oxide esters, as well as thiram bispentamethylene tetrasulfide and accelerators used as vulcanization accelerators.