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- Date: 2014-01-18
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General that the choice of silicone rubber curing system is very limited. But patents related to silicone rubber vulcanization but many. Most patents relate to room temperature cure. Such curing is required with a layer of the tank, plating tank, the electrical surface to be coated with an insulating layer. When the rubber as a seal or other purposes often requires RTV.
Low-temperature vulcanized silicone rubber easiest way is to use the surface OH groups of the silica. Such filler aprotic solvent under conditions cyclotetrasiloxane treated with chlorine heptamethyl. In the presence of dibutyltin dilaurate catalyst under fumed silica filled polydimethyl siloxane -α, ω- diol can RTV. Certain types of silicone may be cured in the presence of silica after the silicon-containing terminal hydroxyl oligomer treatment.
Silicon-containing terminal alkoxy unsaturated elastomer when using sulfur-containing antioxidants can be self-curing, to generate siloxane bonds. Vulcanized rubber excellent in heat resistance.
It has nothing to do with the general principles of the filler modified cold vulcanized silicone rubber has been described in the research paper:
Health crosslinks in the "single component" system consists of raw rubber with OH end groups and a crosslinking agent consisting RSiX3. (Wherein X is hydroxy, imino, silicon nitride, or ethylene amide group). These groups under the effect of moisture in the air hydrolyzed to form OH groups, after which the catalyst will not need to generate Si-O-Si bond by polycondensation.
In the catalyst (Pt, Sn, Ti derivatives) participation in both the silicone rubber containing reactive group-containing composition capable of interacting "two-component" systems crosslinked bond network.
When a filler, no catalyst, the end groups of two or more of the silicone rubber may interact.
In fact, the second, the third case is of the same nature, but containing different active groups from vulcanized rubber.
Currently, a large number of patents describe various aspects of these processes. But most of them differ only in the details. For example, one can print 12 × 104 times, for laser printers, rubber, (strength 5MPa), is not the catalyst diphenyl methyl silicone rubber or silicone rubber, silicone rubber or other. Containing terminal hydroxyl groups and two trimethylsilyl dimethyl silicone rubber and the seven methyl vinyl silicone rubber, and carbon black composition system can also be cured. Furthermore, the sulfurization reaction may also be a silicone rubber with terminal hydroxyl groups with ON = CR2-containing crosslinking agent mixed silicone rubber compound was. Terminal hydroxyl dimethyl silicone rubber available di-, tri- and tetra-functional silane derivative vulcanization in the absence of water.
Silanol-terminated silicone rubber may be in the presence of an inorganic filler with a vinyl (three hydroxy) silane sulfide. Silicone rubber containing trimethyl silanol end groups in the presence of a catalyst, the available vinyl trimethoxy siloxane curing. Curing conditions were 20 ℃ × 7d. The resulting vulcanized rubber strength of 5.6MPa. Such compounds for the production of coatings and adhesives, can also be used in electronic, medical and food industries.
Olefin-containing end groups by the polysiloxane, SiH group-containing polysiloxane, and a catalyst composed of a silicone rubber adhesive may be cured. Its vulcanized rubber and thermoplastic resin adhesion is excellent. Pt and NH3 in the presence of a catalyst, there is a group of the olefin-containing silicone compound may be mixed sulfide. Vulcanized rubber compression permanent deformation is very low.
Heterocyclic silanes, such as bis (trialkyl silyl hydroxy oxyalkylene) pyridine, metal, plastic adhesive tackifier. In the presence of Pt catalyst and a filler, which can be used for curing vinyl-terminated siloxanes and silicones mixed polyhydroxy compound. Sulfurization reaction duration 7d. Aluminum bonding shear strength of 3.8MPa.
Co-vulcanized rubber containing various reactive functional group of rubber (different performance) in special curing agent can have sound co-curing, not only for low-temperature vulcanized silicone rubber is feasible, but also for other high-temperature vulcanized rubber. Such as chlorinated natural rubber and nitrile rubber covulcanizability hydroxy can be prepared oil, wear rubber. Chlorinated butyl rubber and nitrile rubber hydroxyl at 180 ℃ vulcanizing agent can not co-vulcanized. Hydroxy nitrile rubber and chlorosulfonated polyethylene rubber, including carbon black filled compounds may also be co-vulcanized. PVC and hydrogenated nitrile rubber and glue at 180-200 ℃ can be co-cured to form amine and ether crosslinks. Epoxidized natural rubber and chlorosulfonated polyethylene rubber filled with carbon black material, in the absence of a vulcanizing agent may be co-cured. Extremely high strength and tear strength of vulcanized rubber and wear resistance. In the absence of a crosslinking agent, the epoxidized natural rubber and neoprene and XNBR and co-vulcanized with glue. PVC and XNBR co-curing at 180 ℃, vulcanized rubber, oil, high wear resistance.
Therefore, the choice pairing rubber band reactive functional group, co-curing crosslinking agent in the absence of special circumstances, over the past decade to solve the ecological problems resulting cured and improve the performance of the main directions of vulcanized rubber.
Low-temperature vulcanized silicone rubber easiest way is to use the surface OH groups of the silica. Such filler aprotic solvent under conditions cyclotetrasiloxane treated with chlorine heptamethyl. In the presence of dibutyltin dilaurate catalyst under fumed silica filled polydimethyl siloxane -α, ω- diol can RTV. Certain types of silicone may be cured in the presence of silica after the silicon-containing terminal hydroxyl oligomer treatment.
Silicon-containing terminal alkoxy unsaturated elastomer when using sulfur-containing antioxidants can be self-curing, to generate siloxane bonds. Vulcanized rubber excellent in heat resistance.
It has nothing to do with the general principles of the filler modified cold vulcanized silicone rubber has been described in the research paper:
Health crosslinks in the "single component" system consists of raw rubber with OH end groups and a crosslinking agent consisting RSiX3. (Wherein X is hydroxy, imino, silicon nitride, or ethylene amide group). These groups under the effect of moisture in the air hydrolyzed to form OH groups, after which the catalyst will not need to generate Si-O-Si bond by polycondensation.
In the catalyst (Pt, Sn, Ti derivatives) participation in both the silicone rubber containing reactive group-containing composition capable of interacting "two-component" systems crosslinked bond network.
When a filler, no catalyst, the end groups of two or more of the silicone rubber may interact.
In fact, the second, the third case is of the same nature, but containing different active groups from vulcanized rubber.
Currently, a large number of patents describe various aspects of these processes. But most of them differ only in the details. For example, one can print 12 × 104 times, for laser printers, rubber, (strength 5MPa), is not the catalyst diphenyl methyl silicone rubber or silicone rubber, silicone rubber or other. Containing terminal hydroxyl groups and two trimethylsilyl dimethyl silicone rubber and the seven methyl vinyl silicone rubber, and carbon black composition system can also be cured. Furthermore, the sulfurization reaction may also be a silicone rubber with terminal hydroxyl groups with ON = CR2-containing crosslinking agent mixed silicone rubber compound was. Terminal hydroxyl dimethyl silicone rubber available di-, tri- and tetra-functional silane derivative vulcanization in the absence of water.
Silanol-terminated silicone rubber may be in the presence of an inorganic filler with a vinyl (three hydroxy) silane sulfide. Silicone rubber containing trimethyl silanol end groups in the presence of a catalyst, the available vinyl trimethoxy siloxane curing. Curing conditions were 20 ℃ × 7d. The resulting vulcanized rubber strength of 5.6MPa. Such compounds for the production of coatings and adhesives, can also be used in electronic, medical and food industries.
Olefin-containing end groups by the polysiloxane, SiH group-containing polysiloxane, and a catalyst composed of a silicone rubber adhesive may be cured. Its vulcanized rubber and thermoplastic resin adhesion is excellent. Pt and NH3 in the presence of a catalyst, there is a group of the olefin-containing silicone compound may be mixed sulfide. Vulcanized rubber compression permanent deformation is very low.
Heterocyclic silanes, such as bis (trialkyl silyl hydroxy oxyalkylene) pyridine, metal, plastic adhesive tackifier. In the presence of Pt catalyst and a filler, which can be used for curing vinyl-terminated siloxanes and silicones mixed polyhydroxy compound. Sulfurization reaction duration 7d. Aluminum bonding shear strength of 3.8MPa.
Co-vulcanized rubber containing various reactive functional group of rubber (different performance) in special curing agent can have sound co-curing, not only for low-temperature vulcanized silicone rubber is feasible, but also for other high-temperature vulcanized rubber. Such as chlorinated natural rubber and nitrile rubber covulcanizability hydroxy can be prepared oil, wear rubber. Chlorinated butyl rubber and nitrile rubber hydroxyl at 180 ℃ vulcanizing agent can not co-vulcanized. Hydroxy nitrile rubber and chlorosulfonated polyethylene rubber, including carbon black filled compounds may also be co-vulcanized. PVC and hydrogenated nitrile rubber and glue at 180-200 ℃ can be co-cured to form amine and ether crosslinks. Epoxidized natural rubber and chlorosulfonated polyethylene rubber filled with carbon black material, in the absence of a vulcanizing agent may be co-cured. Extremely high strength and tear strength of vulcanized rubber and wear resistance. In the absence of a crosslinking agent, the epoxidized natural rubber and neoprene and XNBR and co-vulcanized with glue. PVC and XNBR co-curing at 180 ℃, vulcanized rubber, oil, high wear resistance.
Therefore, the choice pairing rubber band reactive functional group, co-curing crosslinking agent in the absence of special circumstances, over the past decade to solve the ecological problems resulting cured and improve the performance of the main directions of vulcanized rubber.