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Uses and synthesis of Octaphenylcyclotetrasiloxane Powder

Octaphenylcyclotetrasiloxane Powder Organosilicon products are products in which some or all of the methyl groups in the molecular structure have been replaced by phenyl groups, and they are a class of silicone products with special properties and uses, and they are characterized by higher and lower temperature resistance, radiation resistance, UV resistance, aging resistance, and high refractive index.

Octaphenylcyclotetrasiloxane CAS 546-56-5 organosilicon products can be divided into phenyl organosilicon monomers and phenyl polysiloxanes according to molecular structure, phenyl monomers are mainly phenyl chlorosilanes, that is, chlorosilanes containing phenyl, which are obtained from methyl chlorosilane as raw material through the Grammage method, heat shrinkage method, redistribution method, silicone-hydrogen addition method, direct synthesis method and other processes. Octaphenylcyclotetrasiloxane CAS 546-56-5 is easy to be hydrolyzed and condensed, releasing hydrogen chloride, and it is generally used as raw material for the preparation of phenyl polysiloxane, and will not be used directly. Phenyl chlorosilanes can be divided into: phenyl trichlorosilane, diphenyl dichlorosilane, methyl phenyl dichlorosilane, triphenyl chlorosilane and so on according to the position and number of substituent groups.

Octaphenylcyclotetrasiloxane Raw Materials is an important organosilicon intermediate, which can be used for the synthesis of pharmaceutical intermediates, phenyl silicone oil, phenyl silicone resin, phenyl silicone rubber, etc.; it can also be used as a polyurethane resin, epoxy resin, acrylic resin, PP, PET, PE, etc. as a modification intermediate, which can give the new product high and low temperature resistance, radiation resistance, aging resistance and other properties. It can also be used as modification intermediates for polyurethane resin, epoxy resin, PP, PET, PE, etc., which can make new products resistant to high and low temperature, radiation, aging, etc.

Applications / Functions of Octaphenylcyclotetrasiloxane Powder

Octaphenylcyclotetrasiloxane Powder is used in pharmaceutical intermediates and other polymer synthesis.

Octaphenylcyclotetrasiloxane CAS 546-56-5 is an important silicone intermediate, can be used for the synthesis of pharmaceutical intermediates, phenyl silicone oil, phenyl silicone resins, phenyl silicone rubber, etc.; can also be used as polyurethane resins, epoxy resins, acrylic resins, PP, PET, PE, etc., modification of the intermediate, to give the new product resistance to high and low temperatures, Octaphenylcyclotetrasiloxane Raw Materials can be synthesized by taking diphenyl dichlorosilane as the starting material, and then hydrolyzed, dried and cracked.

The purity and impurity content of Octaphenylcyclotetrasiloxane Raw Materials determine the quality of Octaphenylcyclotetrasiloxane, to obtain high quality Octaphenylcyclotetrasiloxane Powder, on the one hand, we can purify the raw material, diphenyl dichlorosilane, and get rid of impurities. On the one hand, we can purify the raw material diphenyl dichlorosilane to get rid of the impurities, and on the other hand, we can purify the product octaphenylcyclotetrasiloxane.

Physicochemical Property of Octaphenylcyclotetrasiloxane Powder

Octaphenylcyclotetrasiloxane Powder White powdery crystals Insoluble in water, soluble in common chemical solvents, flash point >200℃.

Octaphenylcyclotetrasiloxane CAS 546-56-5 Under the action of trace amounts of sodium silanol and potassium silanol, the Si-O-Si bond in the molecule breaks and rearranges to form a mixture of direct polysiloxane and cyclic siloxane. This catalytic fracture rearrangement process has an equilibrium property, and macromolecular fracture degradation occurs at the same time as the ring-opening polymerization of the cyclic body into a polymer. Reaction with excess sodium hydroxide methanol solution produces sodium diphenylsilanediol.

Preparation Method of Octaphenylcyclotetrasiloxane Powder

Octaphenylcyclotetrasiloxane CAS 546-56-5 can be synthesized by hydrolysis, drying and cracking of diphenyl dichlorosilane as the starting material. The purity and impurity content of diphenyl dichlorosilane determines the quality of octaphenylcyclotetrasiloxane, to get high quality octaphenylcyclotetrasiloxane, on the one hand, we can purify the raw material diphenyl dichlorosilane to get rid of the impurities in it, on the other hand, we can also purify the product octaphenylcyclotetrasiloxane.

Method 1: Octaphenylcyclotetrasiloxane CAS 546-56-5 was synthesized by a two-step method, using diphenyl dichlorosilane, with suitable reaction conditions:

1. (Step 1) synthesize diphenylsilanediol: in a three-port round-bottomed flask equipped with a stirring device, condenser, thermometer, add a certain amount of diphenyl dichlorosilane and deionized water, water in excess relative to diphenyl dichlorosilane, toluene, ethanol as a solvent, and add a small amount of ammonia for absorption of the reaction of the release of hydrogen chloride, the temperature of the ice bath control 0 ~ 5 ℃, maintain the temperature of the reaction, until the reaction system is neutral, the reaction. End the reaction, wash with ethanol 2 ~ 3 times, wash with water to remove the unreacted chlorosilane filtered into anhydrous petroleum ether, add anhydrous sodium sulfate dehydration after vacuum drying, that is, to obtain the white powder crystals, diphenylsilanediol.
2. (Step 2) synthesize octaphenylcyclotetrasiloxane: in a three-port round-bottomed flask equipped with stirring device, condenser, thermometer, add a certain amount of anhydrous ethanol, diphenylsilylene glycol, potassium hydroxide, raise the temperature to 78 ℃ or so, start refluxing, maintain the temperature reaction for about 3 ~ 4 h, the end of the reaction filtration, washed three times with anhydrous ethanol, and then washed to remove excess ions to the water to show neutrality, to remove the unresponsive Diphenylsilanediol was removed, dehydrated with anhydrous sodium sulfate and dried under vacuum to obtain white crystals, Octaphenylcyclotetrasiloxane Powder.

Method 2: Add diphenylsilylene glycol and methanol into the reaction vessel according to the mass ratio, stir until completely dissolved, then add alkali metal hydroxide catalyst, heat up to 60~65℃, reflux for 4~6h, cool down to room temperature, let stand for 5~8h, filtration, drying, to get the needle-like crystal Octaphenylcyclotetrasiloxane Raw. Raw Materials

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