Products Description
Introduction and application of VA-7|Vulcanizator VA-7
Rubber vulcanizing agent refers to a type of chemical substance that can cause a cross-linking reaction in the rubber molecular chain. It is a type of cross-linking agent and is also called a bridging agent in industry. Since C. Goodyear discovered that rubber can be cross-linked using sulfur in 1839, sulfur or sulfide has been used as a cross-linking agent in the rubber industry. This process is called vulcanization. Sulfur and sulfides are called vulcanizing agents. Later, it was discovered that in addition to sulfur and sulfides, other organic peroxides, quinone compounds, metal oxides, amine compounds, resins, selenium, tellurium, quinone oxime compounds, etc. can cross-link linear rubber molecules. Forming a three-dimensional network structure, therefore, the term vulcanizing agent is not limited to sulfides, but generally refers to agents that can cross-link rubber molecular chains, causing linear molecules to form a three-dimensional network structure, reducing plasticity and increasing elasticity and strength. The substances are all called vulcanizing agents, and the word vulcanization should also have a corresponding meaning. Except for some thermoplastic rubbers that do not need to be vulcanized, natural rubber and various synthetic rubbers need to be vulcanized with vulcanizing agents to greatly improve a series of physical and mechanical properties of the rubber.
Specification of VA-7|Vulcanizator VA-7
Resins are mainly used in butyl rubber. Commonly used are phenol formaldehyde derivatives. Amine compounds are mostly used in fluorine rubber and acrylic rubber. Mainly include: triethylenetetramine, tetraethylenepentamine, hexamethylenediamine, 3,3′-dichlorobenzidine and triisopropanolamine, etc. Ester compounds can be used as vulcanizing agents for butyl rubber, natural rubber, and styrene-butadiene rubber. Its characteristics are easy dispersion, fast vulcanization speed, and the vulcanized rubber has good ozone resistance and heat resistance; its disadvantage is that it is easy to scorch. Commonly used ones include p-quinonedioxime, 4,4′-dibenzoylquinonedioxime, tetrachlorobenzoquinone, poly-p-nitrosoquinone, hydroquinone diethoxy ether, etc. As a co-vulcanizing agent for peroxide vulcanization of various rubbers, especially in the peroxide vulcanization process of nitrile rubber, ethylene-propylene rubber and rubber combinations, it can achieve low compression deformation, fast vulcanization speed and durability. Hot air aged rubber. For example, in NBR, when the dosage is 1.5phr, the permanent compression deformation is only 3-8%, which cannot be achieved by using other vulcanizing agents. When the anti-scorch agent is used in chlorosulfonated polyethylene rubber, it can be combined with magnesium oxide, pentaerythritol and thiuram dipentamethylene tetrasulfide (TRA) to be used as an anti-scorch agent; to improve compression deformation, it can be combined with calcium hydroxide and thiuram tetrasulfide. Phenylethylenediamine is combined to form a maleimide vulcanization system. The dosage is 2-4phr, which can greatly reduce compression permanent deformation and improve temperature resistance. Improve the bonding strength to improve the bonding strength between rubber and polyamide fabric, rubber and metal, suitable for direct bonding system. Sulfur-free vulcanizing agent is used for cable rubber. It can replace all sulfur-containing vulcanizing agents such as thiazole and thiuram. It solves the problem of copper sulfide contamination and blackening of copper wires and copper electrical appliances due to contact with sulfur-containing vulcanizing agents. Dosage: Used as anti-scorch agent: 0.5-1.0phr Used as vulcanizing agent: 2-3phr Used to improve compression deformation: 1.5phr Used to improve bonding strength: 0.5-5.0phr Purpose Added to rubber to reduce the plasticity of raw rubber , increased elasticity and strength, and resistant to solvents and chemicals, etc.
Package and transportation of VA-7|Vulcanizator VA-7
Packaging specifications:
25kg/drum; or packaged according to customer requirements.
transportation storage
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