182 results about "Siloxide" patented technology

Processes have been developed for the manufacture of polyhedral oligomeric silsesquioxanes (POSS), polysilsesquioxanes, polyhedral oligomeric silicates (POS), and siloxane molecules bearing reactive ring-strained cyclic olefins (e.g. norbornenyl, cyclopentenyl, etc. functionalities). The preferred manufacturing processes employ the silation of siloxides (Si—OA, where A=H, alkaline or alkaline earth metals) with silane reagents that contain at least one reactive ring-strained cyclic olefin functionality [e.g., X3-ySi(CH3)y(CH2)2 where y=1-2 and X=OH, Cl, Br, I, alkoxide OR, acetate OOCR, peroxide OOR, amine NR2, isocyanate NCO, and R]. Alternatively, similar products can be prepared through hydrosilation reactions between silanes containing at least one silicon-hydrogen bond (Si—H) with ring-strained cyclic olefin reagents [e.g., 5-vinyl, 2 norbornene CH2═CH, cyclopentadiene]. The two processes can be effectively practiced using polymeric silsesquioxanes [RSiO1.5]∞ where ∞=1-1,000,000 or higher and which contain unreacted silanol or silane groups at chain terminus or branch points, on POSS nanostructures of formulas [(RSiO1.5)n]Σ#, homoleptic, [(RSiO1.5)m(R′SiO1.5)n]Σ#, heteroleptic, and {(RSiO1.5)m(RXSiO1.0)n}Σ#, functionalized heteroleptic nanostructures, on silanes RSiX3, linear, cyclic, oligomeric and polymeric siloxanes (polymeric formula RX2Si—(OSiRX)m—OSiRX2 where m=0-1000, X=OH, Cl, Br, I, alkoxide OR, acetate OOCR, peroxide OOR, amine NR2, isocyanate NCO, and R). Each of the processes result in new chemical species bearing one or more ring strained olefins that can undergo polymerization, grafting, or other desirable chemical reactions to form polymeric products. These polymeric systems are most desirably utilized in polymerizations for the modification of properties of thermoplastic or thermoset resin systems or for the preparation of polymers with utility in electronics, medical devices, sporting goods, and aerospace as coatings and structural components.

The invention discloses organic silicon compounds. The organic silicon compounds have the structure shown in a formula (I), wherein a is equal to 0 to 40, b is equal to 0 to 30, c is equal to 0 to 40, a, b and c are all integers and the sum of a, b and c is more than 6. the invention discloses a method for preparing the organic silicon compounds, and the method comprises the following steps of: reacting alpha-hydrogen-omega-hydroxyl polyether with halogenated propylene which serve as raw materials in the presence of alkali metal hydroxides to form diallyl polyether; and reacting the obtained diallyl polyether with 1,1,1,3,5,5,5-heptamethyltrisiloxane in the presence of a Pt catalyst to obtain the finished product. The organic silicon compounds have the advantages of unique structure, low surface tension, no toxin and high oil-collecting effect, and can be widely applied to the field of oil spill pollution treatment in water areas.

The invention discloses a preparation technique of medium / high-viscosity dimethyl silicone oil, which comprises the following steps: swelling chloromethylated polystyrene balls in a trimethylamine water solution, and adding perfluoro tertiary amine; supporting potassium hydroxide to obtain a composite catalyst, and adding octamethylcyclotetrasiloxane (D4) and hexamethyl disiloxane (MM) into the reaction kettle; and after the reaction finishes, filtering to recover the catalyst, extracting under reduced pressure and recovering the low-boiling-point substances, thereby obtaining the methyl silicone oil product.

The invention discloses a metal surface pretreatment agent. Water is used as a solvent, silane is used as a main film forming agent, fluorozirconate and / or fluorozirconic acid are / is used as a second film forming agent, amidogen cage type silsesquioxane (amidogen POSS) is added and used as a film sealant and a repair agent, and acid, a metal promoter, a rare earth compound and a stabilizer can be included as well. In the film forming process of the metal surface coating pretreatment agent, silane film forming and fluorozirconate ceramic film forming are conducted synchronously, mutual doping is conducted, and a dense inorganic-organic hybrid film is formed; and the defects existing in the fluorozirconate film forming process can be repaired in time through silane, the film structure is optimized, multiple kinds of amidogen of the amidogen POSS can react with multiple sites in the film at the same time, the sealing effect can be improved remarkably, and the defects in the film can be well repaired and sealed.

The invention discloses a preparation method and an application of trimethyl silicon alkoxide. The preparation method includes the preparation steps: placing hexamethyldisiloxane and potassium hydroxide into a 10L three-mouth flask; adding 10ml of alcohol preparations; performing heating reflux for 48 hours; dividing water by a water knockout trap; cooling, filtering and drying materials to obtain white solid potassium trimethylsilanolate. Inexpensive trimethyl silicon alkoxide (MM) in industrial production serves as a raw material, and the trimethyl silicon alkoxide and the potassium hydroxide are subjected to heating reflux reaction under various catalysts to prepare potassium trimethylsilanolate with high content. All the catalysts are beneficial to dissolution of the potassium hydroxide, and reaction is facilitated.

The invention provides a synthesis method of hydroxyl silicone oil. The method comprises the following steps: step one, adding hexamethylcyclotrisiloxane, an end-capping reagent, a solvent and a catalyst into a reaction kettle, performing heating until the solvent is boiled, and making a reaction for 1-5 hours at the boiling point of the solvent until the reaction is complete; step two, adding a neutralizer to neutralize until the pH value is 6-8, pumping out the solvent, the end-capping reagent and unreacted hexamethylcyclotrisiloxane under vacuum to obtain a crude product, and filtering outsalt in the crude product to obtain a hydroxyl silicone oil finished product; and step three, analyzing the proportion of each component of the solvent, the end-capping reagent and the unreacted hexamethylcyclotrisiloxane extracted in the step two by using a gas chromatograph, and adding the components into the next batch of reaction production for recycling. The synthesis method has the advantages of no use of controlled chemical raw materials, simple process, completion in one reaction kettle, no generation of waste water and waste gas in the process, generation of less than 10KG per ton ofsalt, cyclic use of the solvent in the reaction, very low process cost, environmental protection, simple process and easy control.