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- Date: 2014-01-18
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Generally that the choice of silicone rubber curing system is very limited. But patents vulcanized silicone rubber has a lot. Most patents relate to room temperature curing. This requires the use of a reservoir with vulcanized rubber layer, the plating bath, the surface to be coated in the electrical insulating layer. When the rubber seals used for other purposes often require RTV.
Low temperature vulcanization silicone rubber easiest way is to use the surface OH group of silica. Such fillers under aprotic solvent conditions cyclotetrasiloxane treated with chlorine heptamethyl. In the catalyst dibutyltin laurate presence of fumed silica filled polydimethylsiloxane -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 a sulfur-containing antioxidant can be self-curing, generate silicon-oxygen bond. Good heat resistance of vulcanized rubber.
Nothing to do with the general principles of the filler modified cold vulcanized silicone rubber has been described in the research paper:
Crosslinked key in the "one-component" system from the raw rubber tape OH end groups and RSiX3 type crosslinking agent thereof. (Wherein X is a hydroxyl group, imide group, a silicon nitride-based or ethylene amide group). These groups under moisture in the air role 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" system key crosslinked network.
When a filler, without a catalyst, two or more end groups of the silicone rubber may interact.
In fact, the second, three kinds of cases are of the same nature, but containing different active groups since 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, rubber for laser printers, (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 of the 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 moisture.
Silanol-containing end groups of the silicone rubber may be in the presence of an inorganic filler with a vinyl (trihydroxy) silane vulcanization. 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 strength of vulcanized rubber 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 polyorganosiloxane, the catalyst and the silicone rubber adhesive composition can also be cured. Vulcanizates and thermoplastic resin and the adhesion is excellent. And NH3 in the presence of Pt catalyst, there is a polysiloxane-containing olefin-based compound can also be mixed vulcanization. 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 adhesive shear strength of 3.8MPa.
Co-vulcanized rubber rubber containing various reactive functional groups (different properties) in the curing agent can have a special sound co-vulcanized, not only for the low-temperature vulcanized silicone rubber is feasible, but is also applicable to other high-temperature vulcanized rubber. Such as chlorinated natural rubber with a hydroxyl group co-vulcanized nitrile rubber, oil can be obtained, wear-resistant rubber. Chlorinated butyl rubber and nitrile rubber hydroxyl at 180 ℃ without curing agent can co-vulcanized. Hydroxy nitrile rubber and chlorosulfonated polyethylene rubber, including carbon black-filled rubber compound may be co-vulcanized. Hydrogenated nitrile rubber with polyvinyl chloride and with glue at 180-200 ℃ copolymerizable sulfide, amine and ether groups generate crosslinks. Epoxidized natural rubber and chlorosulfonated polyethylene rubber compound filled with carbon black, in the absence of the vulcanizing agent may be co-curing. High strength and tear strength of vulcanized rubber and wear resistance. In the case of the absence of a crosslinking agent, an epoxidized natural rubber and chloroprene rubber and carboxylated nitrile rubber and may be co-vulcanized with the rubber. PVC and co-vulcanized carboxylated nitrile rubber at 180 ℃, vulcanizates oil, both high wear resistance.
Therefore, the choice paired rubber band reactive functional group, co-vulcanized in the absence of specific crosslinker circumstances, over the past decade to solve the ecological problems and improve the resulting vulcanization main direction vulcanizates one.
Low temperature vulcanization silicone rubber easiest way is to use the surface OH group of silica. Such fillers under aprotic solvent conditions cyclotetrasiloxane treated with chlorine heptamethyl. In the catalyst dibutyltin laurate presence of fumed silica filled polydimethylsiloxane -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 a sulfur-containing antioxidant can be self-curing, generate silicon-oxygen bond. Good heat resistance of vulcanized rubber.
Nothing to do with the general principles of the filler modified cold vulcanized silicone rubber has been described in the research paper:
Crosslinked key in the "one-component" system from the raw rubber tape OH end groups and RSiX3 type crosslinking agent thereof. (Wherein X is a hydroxyl group, imide group, a silicon nitride-based or ethylene amide group). These groups under moisture in the air role 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" system key crosslinked network.
When a filler, without a catalyst, two or more end groups of the silicone rubber may interact.
In fact, the second, three kinds of cases are of the same nature, but containing different active groups since 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, rubber for laser printers, (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 of the 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 moisture.
Silanol-containing end groups of the silicone rubber may be in the presence of an inorganic filler with a vinyl (trihydroxy) silane vulcanization. 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 strength of vulcanized rubber 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 polyorganosiloxane, the catalyst and the silicone rubber adhesive composition can also be cured. Vulcanizates and thermoplastic resin and the adhesion is excellent. And NH3 in the presence of Pt catalyst, there is a polysiloxane-containing olefin-based compound can also be mixed vulcanization. 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 adhesive shear strength of 3.8MPa.
Co-vulcanized rubber rubber containing various reactive functional groups (different properties) in the curing agent can have a special sound co-vulcanized, not only for the low-temperature vulcanized silicone rubber is feasible, but is also applicable to other high-temperature vulcanized rubber. Such as chlorinated natural rubber with a hydroxyl group co-vulcanized nitrile rubber, oil can be obtained, wear-resistant rubber. Chlorinated butyl rubber and nitrile rubber hydroxyl at 180 ℃ without curing agent can co-vulcanized. Hydroxy nitrile rubber and chlorosulfonated polyethylene rubber, including carbon black-filled rubber compound may be co-vulcanized. Hydrogenated nitrile rubber with polyvinyl chloride and with glue at 180-200 ℃ copolymerizable sulfide, amine and ether groups generate crosslinks. Epoxidized natural rubber and chlorosulfonated polyethylene rubber compound filled with carbon black, in the absence of the vulcanizing agent may be co-curing. High strength and tear strength of vulcanized rubber and wear resistance. In the case of the absence of a crosslinking agent, an epoxidized natural rubber and chloroprene rubber and carboxylated nitrile rubber and may be co-vulcanized with the rubber. PVC and co-vulcanized carboxylated nitrile rubber at 180 ℃, vulcanizates oil, both high wear resistance.
Therefore, the choice paired rubber band reactive functional group, co-vulcanized in the absence of specific crosslinker circumstances, over the past decade to solve the ecological problems and improve the resulting vulcanization main direction vulcanizates one.