11 results about "Diphenylsilanediol" patented technology

The invention belongs to the technical field of polymer flame retardance, and relates to a fluoride-free anti-dripping functional flame retardant for polycarbonate as well as a preparation method and application thereof, in the chemical structural formula of the fluoride-free anti-dripping functional flame retardant for polycarbonate, n is 5-20, and M is Li, Na, K, Rb or Cs; the preparation method comprises the following steps: mixing a metal salt solution of 2, 2 '-disulfonic acid benzidine with an acid-binding agent, dropwise adding a phenylphosphonic dichloride solution, continuing to stir and react after dropwise adding, heating after reaction, dropwise adding a diphenyl silanediol solution, continuing to react after dropwise adding, and finally performing post-treatment to obtain the fluoride-free anti-dripping functional flame retardant for polycarbonate. According to the application of the flame-retardant polycarbonate, polycarbonate and the fluoride-free anti-dripping functional flame retardant for polycarbonate are subjected to melt blending, so that the flame-retardant polycarbonate is prepared. The functional flame retardant disclosed by the invention integrates multiple functions of flame retardance, molten drop resistance, carbon formation enhancement and the like, and flame-retardant polycarbonate prepared from the functional flame retardant realizes no molten drop by virtue of a self-enhanced ceramic carbon layer.

The application belongs to the technical field of organic silicon and relates to a preparation method of low-viscosity hydroxyl-terminated phenyl silicone oil, which comprises the following steps: (S1) adding diphenylsilanediol, organic acid anhydride and an acidic catalyst into an aprotic polar organic solvent to perform acylation reaction to obtain an acylated product; (S2) adding the acylated product dropwise into an alkaline aqueous solution under stirring until the system is neutral, then performing hydrolysis and polycondensation, separating the upper oil phase after the reaction is completed, and obtaining a phenyl-containing prepolymer; and (S3) mixing the phenyl-containing prepolymer, cyclosiloxane and an alkali metal catalyst, then performing ring-opening copolymerization reaction in an inert atmosphere, and obtaining the low-viscosity hydroxyl-terminated phenyl silicone oil after purification. The viscosity of the hydroxyl-terminated phenyl silicone oil prepared by the application is low, the viscosity at 25 DEG C is 200-1000 mPa.s, the phenyl content is adjustable, there is no methoxy group, the preparation cost is low, and the preparation process is environmentally friendly.

The invention discloses a silicon resin-based super-hydrophobic nano-coating and a production process thereof, and relates to the technical field of waterproof paints.The hydrophobic branched polysiloxane is prepared, surface energy is reduced by adding diphenyl silanediol and introducing phenyl to enhance hydrophobicity, adding octyl triethoxy silane and adding long-chain alkyl, and the hydrophobic branched polysiloxane has the advantages that the surface energy is reduced; and tridecafluorooctyltriethoxysilane is added, and a fluorine-containing group is introduced, so that the hydrophobicity is further improved. According to the invention, trifluoropropyltriethoxysilane is also added, so that the surface energy is reduced, and the hydrophobicity of the nano coating is improved. The problems that epoxy resin is high in polarity, silicon resin is low in polarity, the epoxy resin and the silicon resin are poor in compatibility, and mixing layering and curing phase separation are prone to occurring in the prior art are solved, a large amount of vinyltriethoxysilane is added, vinyl can be subjected to an addition reaction with epoxy groups of bisphenol A type epoxy resin, the compatibility is improved, and therefore the hydrophobicity and compactness of the super-hydrophobic nano coating are improved.

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.

The invention belongs to the technical field of electric power engineering, and particularly relates to a composite layer material for a cable intermediate joint and a preparation method of the composite layer material. The composite layer material for the cable intermediate joint is composed of an inner semi-conductive layer, an insulating layer and an outer semi-conductive layer, the silicone rubber is prepared from the following raw materials: methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber, trifluoropropyl methyl vinyl silicone rubber, a vulcanizing agent, an assistant crosslinker, an accelerant, diphenyl silanediol, an anti-aging agent, trifluoropropyl cage type silsesquioxane, and a mixture of modified nano hydroxyapatite and nano hectorite. According to the composite layer material for the cable intermediate joint, the three layers adopt the consistent siloxane main chain structure and vulcanization system, interlayer chemical compatibility is ensured, synchronous co-crosslinking is achieved, and by adjusting the silicone rubber composition and proportion of all the layers, the composite layer material can be applied to the cable intermediate joint. And it is ensured that the prepared composite layer material for the cable intermediate joint has excellent mechanical and hydrophobic water-blocking performance.

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.

The invention discloses a preparation method of high-temperature-resistant phenyl silicone resin, and relates to the field of polymer material chemistry, and the preparation method comprises the following steps: mixing diphenyl dihalosilane and an organic solvent according to a mass ratio of 1: (1-10), slowly adding the mixture into a water solvent system containing weak base for hydrolysis reaction, maintaining the alkalinity of the system to instantaneously neutralize the generated acid, and carrying out solid-liquid separation to obtain the high-temperature-resistant phenyl silicone resin. After the reaction, recrystallizing to obtain a diphenyl silanediol intermediate; dissolving the diphenyl silanediol intermediate in low-carbon alcohol or acetone, adding a strong base catalyst, and carrying out cyclization reaction to generate octaphenylcyclotetrasiloxane crystals; and dissolving the octaphenylcyclotetrasiloxane crystal in an organic solvent, adding an adsorbent, stirring, filtering, adding a precipitating agent with the volume 1-4 times that of the filtrate for recrystallization, and centrifuging and drying the precipitated crystal to obtain the octaphenylcyclotetrasiloxane crystal with the purity of 99.9% or above. According to the preparation method of the high-temperature-resistant phenyl silicone resin, the prepared phenyl silicone resin has high purity, excellent heat resistance, good toughness and stable consistency.

The application belongs to the technical field of electric power engineering, and particularly relates to a composite layer material for cable intermediate joint and a preparation method thereof. The composite layer material for cable intermediate joint is composed of an inner semi-conductive layer, an insulating layer and an outer semi-conductive layer. The insulating layer is composed of the following raw materials: methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber, trifluoro propyl methyl vinyl silicone rubber, vulcanizing agent, auxiliary cross-linking agent, accelerator, diphenyl silicone diol, anti-aging agent, trifluoro propyl cage type silsesquioxane, and a mixture of modified nano-hydroxyapatite and nano-laponite. The composite layer material for cable intermediate joint has a consistent siloxane main chain structure and vulcanization system in three layers, which ensures the chemical compatibility between layers and realizes synchronous co-crosslinking. By adjusting the composition and ratio of silicone rubber in each layer, the prepared composite layer material for cable intermediate joint has excellent mechanical and hydrophobic water-blocking properties.

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.