5 results about "Diphenylsilanediol" patented technology

This invention relates to the field of octaphenylcyclotetrasiloxane preparation technology and discloses a system for preparing high-purity octaphenylcyclotetrasiloxane. The system includes a mixing reactor with a filter plate fixedly installed at the bottom. Multiple pipes are installed on the mixing reactor, and a power source is installed at the top. A rotating shaft is fixedly installed at the output end of the power source, and a stirring shaft is mounted on the rotating shaft. Multiple positioning sleeves are mounted on the stirring shaft, one of which is close to the filter plate. Multiple stirring blades are mounted on each positioning sleeve. This system for preparing high-purity octaphenylcyclotetrasiloxane achieves integrated continuous operation of the entire process of hydrolysis, filtration, washing, and vacuum drying of diphenylsilanediol intermediates through the mixing reactor, filter plate, stirring shaft, positioning sleeves, and stirring blades. This completely avoids the frequent transfer and exposure of materials between different devices in traditional processes, greatly reducing the risks of introducing external impurities, solvent evaporation, and human error.

This application provides a silicone-modified waterborne polyurethane and its preparation method. The preparation method includes the following steps: Hydroxyl-terminated polyether-modified silicone oil and isoflurane diisocyanate are placed in a container, and the temperature is raised to 80-90℃ and maintained for 1.5-2.5 hours; then polytetrahydrofuran and diphenylsilanediol are added sequentially, and the temperature is raised to 85-95℃ and reacted for 2.5-3.5 hours until the -NCO content is close to or reaches the theoretical value, at which point the reaction is stopped to obtain a prepolymer; then the temperature of the prepolymer is lowered to below 40℃, acetone and triethylamine are added, and the reaction is carried out for 3-5 minutes; then the product is transferred to a reaction vessel containing an appropriate amount of deionized water and defoamer and stirred evenly to form an emulsion; finally, a mixture of deionized water, diethylenetriamine, and ethylenediamine is added for emulsification to obtain the silicone-modified waterborne polyurethane.

This invention discloses a high flame-retardant insulating phenyl silicone rubber for power applications and its preparation method, belonging to the field of silicone rubber technology. The phenyl silicone rubber, by weight, comprises the following raw material components: matrix material: 80-100 parts of vinyl-terminated polydimethylsiloxane and 20-30 parts of phenyl silicone rubber; reinforcing agent: 30-50 parts of fumed silica; flame retardant: 25-40 parts of modified magnesium hydroxide, 10-15 parts of ammonium polyphosphate, and 5-10 parts of melamine cyanurate; thermally conductive filler: 15-25 parts of nano-boron nitride; structure modifier: 2-4 parts of diphenylsilanediol and 3-6 parts of phenyl silicone oil; crosslinking agent: 8-12 parts of hydrogen-containing silicone oil; catalyst: 0.2-0.4 parts of platinum catalyst; inhibitor: 0.1-0.3 parts of ethynylcyclohexanol; functional additives: 1-3 parts of silane coupling agent and 0.5-1 parts of antioxidant.

This invention relates to a salt spray resistant and anti-aging curing coating and its preparation method, belonging to the field of coating technology. The coating includes modified epoxy resin, ternary nanocomposite filler, composite light stabilizer, hydrophobic eutectic solvent, polysiloxane-modified aromatic amine curing agent, and bio-based polyurethane curing agent. The modified epoxy resin is prepared by reacting bisphenol F epoxy resin, KH-560 silane coupling agent, and tetrabutylammonium bromide, followed by the addition of bi-terminated epoxy silicone oil, 3,3'-dithiodipropionic acid, and p-toluenesulfonic acid, and then by adding pentaerythritol phosphate and antioxidant 1010. The polysiloxane-modified aromatic amine curing agent is prepared by reacting m-phenylenediamine as a matrix, KH-560 silane coupling agent, diphenylsilanediol, and dibutyltin dilaurate. The bio-based polyurethane curing agent is prepared by reacting castor oil-modified polyol, isophorone diisocyanate, dibutyltin dilaurate, dimethylolpropionic acid, and trimethylolpropane.

The application relates to the technical field of shielding silica gel processing, in particular to a shielding silica gel and a preparation method and application thereof, which are prepared from the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber, 10-20 parts of a plasticizer, 8-12 parts of fumed white carbon black, 2-4 parts of hydroxyl silicone oil, 120-200 parts of graphite, 20-30 parts of a modified dispersant, 5-10 parts of carbon nanotubes, 5-10 parts of carbon black, 0.2-0.5 parts of a vulcanizing agent, and 0-4 parts of a silane coupling agent; the plasticizer is composed of dodecamethylcyclohexasiloxane, epoxy silicone oil and alkoxy silicone oil; the modified dispersant is composed of polyoxyethylene hydrogenated castor oil, a diphenylsilanediol alcohol solution and hexamethylcyclotrisilazane; by adopting the above formula, the shielding silica gel still has low compression permanent deformation and high resilience under an ultrahigh filling amount, the shielding and conductive performances of the shielding silica gel are greatly improved, and the problems of limited shielding effect, increased compression permanent deformation and reduced resilience of the existing shielding silica gel are solved.