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Classification and main uses of vulcanizing agents in silicone products

by:ORK      2022-10-30
Vulcanizing agent is also called cross-linking agent. It is a chemical substance that can make the molecular structure chain of vulcanized rubber react chemically cross-link, make the linear molecular structure produce a three-dimensional porous structure, reduce the ductility, and improve the ductility agent. Except for some thermoplastic rubbers that do not use vulcanized rubber, natural rubber and various styrene-butadiene rubbers need to be mixed with vulcanizing agents to develop vulcanized rubber. Vulcanized rubber only has the value of precious commodities after being vulcanized, and its physical properties are further improved. Vulcanizing agents are divided into two categories: inorganic and organic chemistry. The former has sulfur powder, sulfur monoxide, selenium tellurium and so on. The latter vulcanization accelerators with sulfur content (such as vulcanization accelerator TMTD), organic chemical peroxides (such as benzoyl peroxide), quinone oxime chemicals, polysulfide polymers, urethanes, Malayanyl imine compounds, etc. Vulcanized rubber vulcanizers include elemental sulfur, selenium, hoof, sulfur content chemicals, peroxides, quinone compounds, acrylamine chemicals, epoxy resin compounds, hydroxides and their acrylates, etc. The most widely used are elemental sulfur and sulfur content chemicals. The vulcanizing agent is suitable for all kinds of natural rubber and styrene-butadiene rubber. Different types of vulcanizing agents can be used in cooperation with each other according to the needs. Vulcanizing agent PDM Vulcanizing agent PDM, the organic chemical name is N, N’- m-phenylene bismaleimide. This product is this kind of intelligent rubber additive. It can be used as a vulcanizing agent in the whole process of rubber processing, and can also be used as a co-vulcanizing agent for peroxide management system. It can also be used as an anti-scorch agent and a tackifier. It is also suitable for the management system of special rubber and rubber and plastic products. Chemical properties Appearance: light yellow powder Content: 268.21 Melting point:≥196℃ Chemical formula: C14H8O4N2 Carbon residue:≤0.51% heating and reducing medicine:≤0.52% Solubility: Soluble in tetrahydrofuran and hot toluene, insoluble in petroleum ether, dichloromethane, magnesium tetrachloride, benzene and water. Scope of application. When used as a scorch inhibitor for chlorosulfonated polyethylene vulcanizate, it can be mixed with magnesium oxide, pentaerythritol and Bipolymethyl tetrasulfide rubber thiuram (TRA) cooperates with each other as a scorch retarder; the improved shrinkage deformation, calcium hydroxide and diphenylethylenediamine cooperate with each other to form the Malaysian imide vulcanized rubber management system. 2-4phr, can greatly reduce the permanent deformation and improve the heat resistance. Improve the bonding compressive strength Improve the bonding compressive strength of vulcanized rubber and nylon 6 textiles, vulcanized rubber and metal materials, suitable for immediate bonding management system. Others This product is a sulfur-free vulcanizing agent, which is used to vulcanize rubber for cables. It can replace all sulfur-containing vulcanizing agents such as thiazoles and thiurams, and treat copper power lines and copper household appliances. Difficulties in copper environmental pollution and blackening. Dosage Used as anti-scorch agent: 0.5-1.0phr Used as vulcanizing agent: 2-3phr. Used to improve shrinkage deformation 1.5phr Used to improve bonding compressive strength: 0.5-5.0phr. Vulcanizing agent In natural rubber, when combined with sulfur, it can prevent the vulcanized rubber from returning to its original state, improve temperature resistance, reduce heat generation, anti-aging, and improve the adhesion between the vulcanized rubber and the cord and the modulus of the vulcanized rubber. It can be used in vulcanized rubber such as load-carrying tire shoulder rubber and buffer layer. It can handle the shoulder air difficulties of biased truck tires. It can also be used for large-sized and thick crafts of natural rubber and various vulcanized rubber miscellaneous goods. For example: combined with sulfur, vulcanization accelerator MPMCZ or TMTD as initiator, vulcanized rubber diene vulcanized rubber (natural rubber, styrene-butadiene rubber, butadiene rubber, generated isoprene vulcanized rubber) can increase the scorch time and reduce the calorific value. , high tensile and compressive strength, high resistance to vulcanized rubber reversion and other characteristics, together can improve H extraction, suitable for high temperature vulcanized rubber seals (183 ℃) amount of 2-3phr, suitable for large and medium-sized tires and thicker type, increase handicrafts . As a vulcanization accelerator for neoprene, it can significantly improve the scorch resistance of the mixed rubber. The auxiliary vulcanizing agent is used as the auxiliary vulcanizing agent for the peroxide vulcanized rubber body of various vulcanized rubbers, especially in the whole process of the peroxide vulcanization rubber of NBR, ethylene-propylene rubber and its vulcanized rubber compound, it can have low shrinkage and low deformation. , vulcanized rubber faster and resistant to high temperature gas embrittlement of plastic pellets. For example, in NBR, when the dosage is 1.5phr, the permanent shrinkage deformation is only 3-8%, which cannot be surpassed by other co-vulcanizing agents. In neoprene, chlorosulfonated polyethylene vulcanized rubber, styrene-butadiene rubber, nitrile rubber, isoprene vulcanized rubber, butyl rubber, bromobutyl rubber, acrylic resin vulcanized rubber, silicone rubber and rubber and plastic products combined rubber and other special rubbers , As an auxiliary vulcanizing agent, it can significantly improve the relationship characteristics, improve temperature resistance, suitable for high-temperature vulcanized rubber management system, reduce permanent deformation is very significant, but also reduce the amount of peroxide used to avoid plastic particles in the production process. Scorch, improve the bonding compressive strength of plastic pellets, cords and metal materials.
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