503 results about "Hexamethyldisiloxane" patented technology

The invention relates to a quaternized modified amino silicone oil softener and preparation and application thereof. The softener comprises the following general formula in the specification. The preparation comprises the following steps of: (1) adding octamethylcy-clotetrasiloxane into a container, adding a coupling agent N-beta-(aminoethyl)-gamma-aminopropyl methyl dimethoxysilane into the container dropwise, adding a tetramethyl ammonium hydroxide catalyst and subsequently a capping agent hexamethyl disiloxane into the container, and then performing reduced pressure distillation to obtain amino silicon oil; (2) dissolving the amino silicon oil into a solvent, adding the mixture into epichlorohydrin, stirring and heating to react under the protection of nitrogen, and removing the solvent by steaming to obtain an intermediate product; and (3) uniformly mixing N,N-dimethyl-decanamide and the solvent to obtain a mixture, stirring with heating, adding the intermediate product dropwise into the mixture under the protection of nitrogen, performing a thermostatic reaction, and removing the solvent by steaming to obtain the product. The softener of the invention has high hydrophilicity and high stability; fabric processed by the softener has excellent soft handfeel, high hydrophilicity, low yellowing, antibacterial property and the like; and the softener is simple to prepare and is suitable for industrial production.

The invention relates to a method for synthesizing epoxy quaternization modified amino-silicone oil, pertaining to the technical field organic silicide amino-silicone oil preparation. The method includes the following main procedures: (1) synthesis of amino-silicone oil: the raw material of octamethylcy-clotetrasiloxane (D4 linear body), N-Beta-aminoethylGemma- aminopropylmethyldimethyoxysilane (KH-602), hexamethyl dimethyl siloxane (MM), catalyst potassium hydroxide and deionized water are placed in a reactor for reaction for 5-6 hours under 100-110 DEG C, and the desired amino-silicone oil is achieved after being cooled; (2) proper amount of epichlorohydrin is added for reaction under 80 DEG C, the amino-silicone oil is processed by epoxy quaternization to achieve epoxy quaternary ammonium salt amino-silicone oil; (3) the quaternary ammonium salt amino-silicone oil is emulsified by deionized water, water is slowly added under 85 DEG C and stirred, and the water miscible liquid of epoxy quaternization modified amino-silicone oil is finally achieved. The product achieved by the method is applicable to textile fabric neatening and has pilling resistant and fluffing resistant properties.

The present invention discloses silicon-containing (methyl) acrylate monomer and its copolymer and their preparation process. The silicon-containing (methyl) acrylate monomer as silane or silane oligomer with methyl propenyl acyloxy radical or propenyl acyloxy radical is prepared through the catalytic reaction of silane coupler with (methyl) propenyl acyloxy radical, and hexamethyl disilane or hexamethyl disilane and active organosilicon under the action of catalyst. The present invention also discloses one kind of silicon-containing (methyl) acrylate copolymer and its solution copolymerization, water emulsion copolymerization and ultraviolet curing process. The copolymer has excellent adhering performance, waterproof and antifouling performance and weather resistance.

The invention discloses a preparation method of methylsilicone oil, and specifically relates to methyl silicone oil with different viscosity (molecular weight) prepared by using supported solid superacid SO4<2->/ZrO2-ZSM-5 as a catalyst and by adopting inexpensive and commercially available methylsilicone oil (Dn), octamethylcyclotetrasiloxane (D4) and hexamethyldisiloxane (MM), so as to fit various needs. Compared with a conventional catalyst for producing methylsilicone oil, the supported solid superacid catalyst provided by the invention has higher catalytic activity, higher stability, lower cost and the like. More importantly, the supported solid superacid catalyst is in a solid state and can be separated via simple filtration and reused, thereby enabling the production to have the advantages of simple process, convenient operation, no pollutions, no corrosion toward equipment, and the like.

The invention belongs to the technical field of silicone pressure-sensitive adhesive preparation, and in particular relates to an emulsion-type silicone pressure-sensitive adhesive and a preparation method thereof. It is composed of silicone rubber emulsion, MQ silicone resin emulsion, crosslinking agent and organic tin catalyst. The weight ratio of MQ silicone resin to silicone rubber is (40-70): (60-30), and the amount of crosslinking agent added is MQ silicone resin and 1% to 10% of the total weight of silicone rubber, the amount of organotin catalyst added is 0.1% to 1% of the total weight of MQ silicone resin and silicone rubber, wherein, MQ silicone resin is combined with hexamethyldisiloxane as M group and As the Q group, tetraethyl orthosilicate or water glass is hydrolyzed and condensed, the molar ratio of M group to Q group is (0.6~1.0):1, and the number average molecular weight Mn of MQ silicone resin is 2000~6000 ; The crosslinking agent is an organosiloxane crosslinking agent with three active functional groups. The organosiloxane emulsion synthesized by the invention solidifies after water evaporation to form a pressure-sensitive adhesive elastomer film with good initial tack and cohesive strength.

A process for preparing trisiloxane containing glucosylamido used as the assistant of agricultural chemical to decrease the surface tension of water includes catalytic reaction between hexamethyl disiloxane and aminosilane to obtain aminotrisiloxane, and reacting on lacton gluconate in methanol.

The invention relates to the field of organic polymer chemistry and discloses a T-chain unit phenyl-containing MTQ silicon resin and a preparation method thereof. The T-chain unit phenyl-containing MTQ silicon resin solves the problem that a MTQ silicon resin as a silicon rubber reinforcement filler leads to a large difference between refractive indexes of a packaging material and a LED chip because of a small refractive index of the MTQ silicon resin and thus optical efficiency of a semiconductor lighting device is reduced. The preparation method comprises that tetraethoxysilane as a Q chain unit source, phenyltrimethoxysilane as a T chain unit source, hexamethyldisiloxane as an M chain unit source and 1,3-divinyltetramethyldisiloxane as an M chain unit source undergo a co-hydrolytic condensation reaction in the presence of hydrochloric acid as a catalyst to produce the T-chain unit phenyl-containing MTQ silicon resin. The T-chain unit phenyl-containing MTQ silicon resin can improve luminous efficacy of a semiconductor lighting device and improve mechanical properties of a packaging material. The preparation method allows mild reaction conditions, has simple processes and is suitable for large-scale industrial production.

The invention discloses a preparation method of an organosilicon foam stabilizer applied to a single-component polyurethane foam sealing agent. The preparation method comprises the steps of (1) adding allyl alcohol, ethylene oxide and propylene oxide to a reaction kettle, and reacting under the action of a base catalyst at the temperature of 90-130 DEG C and pressure not more than 0.5MPa for 4-6h to obtain allyl-terminated copolymer ether; (2) reacting the polyether prepared in the step 1 with sodium at 85-120 DEG C, introducing excess haloalkane, and reacting for 4-6h to obtain methyl-terminated copolymer ether; (3) reacting octamethyl cyclotetrasiloxane, hexamethyl disiloxane and high-hydrogen-content silicone oil with hydrogen content of 1-2% in the presence of an acid ion exchanger to obtain low-hydrogen-content silicone oil with hydrogen content of 0.05-1.0%; (4) mixing the products obtained in the steps 1,2, and 3, adding a catalyst, and reacting under the condition of pressure being 0.5-2atm for 3-8h to obtain the organosilicon foam stabilizer. During foaming, the foam stabilizer has excellent dimensional stability and high foaming ratio and fluidity.

The invention relates to a method for preparing an organosilicon surfactant with a T-shaped structure for a pesticide. The method comprises the following steps: (1) preparation of hydrogen containing trisiloxane, in which, full containing hydrogen silicone oil, hexamethyl disiloxane and catalyst are added into a reactor, the temperature of the mixture is controlled to be between 10 and 100 DEG C with stirring, after reacting for 0.5 to 12 hours, the mixture is cooled, and then distilled and purified to prepare the hydrogen containing trisiloxane; and (2) synthesis of the organosilicon surfactant, in which, the hydrogen containing trisiloxane and allyl polyether are added into the reactor, are heated to a temperature of between 60 and 120 DEG C under stirring in nitrogen, catalyst platinum-allyl polyether is added into the reactor to react for 2 to 12 hours, and the mixture is devolatilized in vacuum for 30 minutes and is cooled to a room temperature to prepare the organosilicon surfactant. The method has a simple process, easy industrial production and high product purity without cross linked polymer impurities.

The invention discloses a long-chain alkyl phenyl modified hydrogen containing silicone oil releasing agent preparation method. The method includes the steps of subjecting tetramethyl tetra-hydrogen cyclotetrasiloxane and a catalyst of chloroplatinic acid to reaction, dropping styrene for reaction for some time, dropping long-chain alpha-olefin and a chloroplatinic acid isopropyl propanol solution to obtain an intermediate product of tetramethyl alkyl phenyl cyclotetrasiloxane, subjecting the obtained intermediate product of tetramethyl alkyl phenyl cyclotetrasiloxane, octamethylcyclotetrasiloxane, hexamethyldisiloxane and an acid catalyst to full reaction, fully cooling the obtained liquid, slowly adding calcium hydroxide to adjusting the PH value to 6-7, filtering out solids produced in neutralization with a vacuum pump, adding anhydrous magnesium sulfate to adsorb water produced in neutralization, and filtering to obtain a long-chain alkyl phenyl modified hydrogen containing silicone oil releasing agent. The long-chain alkyl phenyl modified hydrogen containing silicone oil releasing agent prepared through the preparation method has the advantages of being simple in process, high in efficiency, low in cost, short in cycle and the like.

A polyethanediol modified trisiloxane containing glucosylamido used as the assistant of agricultural chemical to decrease the surface tension of water is prepared through catalytic reaction between hexamethyldisiloxane and aminosilane to obtain aminotrisiloxane, reacting on lactone gluconate in methanol to obtain trisiloxane containing glucosylamido, and modifying it by polyethanediol method glicideether.

The invention relates to a preparation method of a quaternized organosilicon modified acrylate emulsion. The method mainly comprises the processes of: (1) synthesizing amino silicone oil by putting otcamethylcyclotetrasiloxane, a double bond-containing silane coupling agent, N-beta-(aminoethyl)-gamma-aminopropylmethyldimethoxysilane, hexamethyldisiloxane, potassium hydroxide and deionized water in a reaction container for reaction at a temperature of 100-110DEG C; (2) adding an alkyl halide or epoxy alkyl halide for quaternization treatment at a temperature of 50-90DEG C, thus obtaining quaternized modified amino silicone oil; (3) adding an emulsifier, acrylate monomers and deionized water into the quaternized modified amino silicone oil obtained on step (2), and employing an oxidation-reduction initiating system for copolymerization reaction, thus obtaining a quaternized organosilicon modified acrylate emulsion. The product of the invention can be used for textile finishing, especially for acrylic fabric, and has good pilling resistance.

The invention relates to the field of organic polymer chemistry and provides a chemical crosslinking-curable phenyl MDQ-type silicone resin and a preparation method thereof. The chemical crosslinking-curable phenyl MDQ-type silicone resin solves the problem that the existing MDQ-type silicone resin has a low refractive index and is not cured by a chemical crosslinking method, and improves optical and mechanical properties of a silicone resin-reinforced rubber-type packaging material. Hexamethyldisiloxane and 1,3-divinyltetramethyldisiloxane as blocking agents, methylphenyldiethoxysilane as a D chain unit source and tetraethoxysilane as a Q chain unit source undergo a co-hydrolytic condensation reaction in the presence of an ethanol aqueous solution as a reaction solvent, toluene as an extractant and hydrochloric acid as a catalyst to produce the chemical crosslinking-curable phenyl MDQ-type silicone resin. The chemical crosslinking-curable phenyl MDQ-type silicone resin improves mechanical properties of a MDQ-type silicone resin-reinforced rubber-type packaging material and improves optical properties of the rubber-type packaging material. The preparation method has mild reaction conditions, has simple processes and is suitable for large-scale industrial production.

The invention discloses a preparation method of reactive MQ silicon resin. The method comprises the following steps of: (1) hydrolyzing and condensing siloxane, alkoxy silane and a homopolymer thereof; (2) leaching a product prepared in the step (1) with a weak-polar or non-polar solvent; (3) washing the product with an aqueous solution to a neutral state; and (4) distilling and concentrating at reduced pressure to obtain the reactive MQ silicon resin, wherein an M unit of the reactive MQ silicon resin in the step (1) contains hexamethyldisiloxane, divinyl tetramethyl disiloxane, tetramethyldisiloxane, 1,1,3,3-tetramethyl-1,3 diphenyldisiloxane, 1,3-diethyl-1,1,3,3-tetramethyldisiloxane or a mixture thereof; a Q unit of the reactive MQ silicon resin contains tetramethyl silicate, tetraethoxysilane, tetraisopropoxidesilane, tetrabutoxysilane, tetrakis(butoxyethoxy)silane and a mixture of homopolymers thereof; the solution in the step (3) consists of a methanol aqueous solution, an ethanol aqueous solution, an isopropanol aqueous solution, a normal butanol aqueous solution, an isobutyl alcohol aqueous solution or a mixed aqueous solution thereof; and the mass fraction of the solution is 30-80.

The invention discloses a method for preparing fiber-reinforced silicon dioxide aerogel. The method comprises the following steps: mixing metasilicic acid butyl ester, tertiary butanol and water according to a ratio, adjusting the pH value through hydrochloric acid and ammonium hydroxide, and compounding with a glass fiber felt so as to obtain wet fiber-reinforced silicon dioxide gel; performing soaking modification with trimethylchlorosilane and hexamethyldisiloxane, and further performing CO2 supercritical drying, so as to obtain hydrophobic fiber-reinforced silicon dioxide aerogel. Novel gel raw materials are used, the channel for preparation of aerogel is further widened, the preparation cost is lowered, moreover, excellent product quality is achieved.

The invention relates to a method for synthesizing hexamethyldisilazane. The hexamethyldisilazane is synthesized by a mixed solvent method through one-step ammoniation reaction, the hydrolysis side reaction of the hexamethyldisilazane can be inhibited by adding hexamethyldisiloxane into a reaction system, and reaction yield is improved. By the method, the yield is high, reaction time is short, energy consumption during rectification is low, the production cost of the hexamethyldisilazane is reduced, and the large advantage of industrialization is achieved.

The invention discloses a high-flame-retardancy paint which is prepared from a water-based acrylate emulsion, a water-based polyurethane resin, aluminasol, an epoxy resin, polydimethylsiloxane, zinc oxide, hollow glass microspheres, nano zirconium oxide, montmorillonite, nano silicon dioxide, a film forming aid, a defoaming agent, a leveling agent, a wetting agent, a flame retardant and water. The flame retardant is formed by mixing boron oxide, dimethyl methyl phosphonate, phosphorus pentoxide, tri(2-chloropropyl) phosphate, guanylurea phosphate, ammonium polyphosphate, pentaerythritol, melamine and hexamethyl disiloxane. The high-flame-retardancy paint has the advantages of favorable water resistance, favorable wear resistance, excellent flame retardancy and long service life.

The invention relates to the technical field of chemical engineering, in particular to a preparation method for low hydrogen-containing silicon oil. The preparation method adopts high hydrogen-containing silicon oil (202) and dimethylcyclosiloxane (DMC) as raw materials and hexamethyldisiloxane (MM) as an end-capping agent, under the catalysis of a solid superacid, the temperature is increased to 50-140 DEG C for a telomerization, and the low hydrogen-containing silicon oil is prepared. Compared with the prior art for preparing the low hydrogen-containing silicon oil under the catalysis of vitriol, the preparation method adopts the solid superacid as a catalyst, the catalyst has a good catalysis effect and can be reused, neutralization and washing are not required during the preparation method, and short time is taken by the whole preparation process, continuous method industrial production is likely to be achieved, and the production efficiency is high.

An end effector assembly for use with an electrosurgical instrument is provided. The electrosurgical instrument includes a handle having a shaft that extends therefrom, an end effector disposed at a distal end of the shaft, at least one electrode operably coupled to the end effector and adapted to couple to a source of electrosurgical energy, a chromium nitride coating covering at least a portion of the electrode, and a hexamethyldisiloxane plasma coating covering at least a portion of the chromium nitride coating.

The invention relates to an organosilicon fire retardant for ABS and a preparation method thereof. The invention provides an organosilicon fire retardant for ABS with good consistency with ABS, small mechanical properties influence on ABS, less addition, excellent flame retardation performance and other characteristics and provides a preparation method of the organosilicon fire retardant for ABS.The organosilicon fire retardant of ABS is a polymer. Under a condition of nitrogen protection, dimethyl siloxane cycle, aminosilane, trialkoxy silane and catalyst undergo a reaction with hexamethyldisiloxane as an end-capping reagent at a temperature of 80 to 140 DEG C. After the reaction, a low-boiling-point substance is extracted by pressure reduction and the organosilicon fire retardant product for ABS can be obtained.

The invention relates to quaternized organic silicone oil and a preparation method thereof. The preparation method comprises the following steps: (1) adding octamethylcyclotetrasiloxane, an ammonia type coupling agent and an alkali catalyst into a mixed solvent, using hexamethyldisiloxane as an end-capping agent, and conducting ring opening polymerization through solution polymerization reaction so as to obtain an amino silicon oil solution; (2) adding dimethylaminoethyl methacrylate, and enabling Michael addition reaction so as to obtain the modified amino silicon oil solution; (3) adding alkyl halide, conducting quaternization reaction, and conducting reduced pressure distillation to remove the mixed solvent so as to obtain the quaternized organic silicone oil; (4) conducting water emulsification on the quaternized organic silicone oil. According to the quaternized organic silicone oil and the preparation method thereof, not only can the obtained quaternized organic silicone oil be self-emulsified, but also no emulsifying agent needs to be added when in water emulsification, influence exerted on performance of adhesive force, water resistance, scrubbing resistance and the like can be avoided, and the quaternized organic silicone oil has antibacterial performance and an obvious color-deepening effect on dark-color polyester fabric when being used as a color-deepening finishing agent.

The invention discloses a synthesizing method of trimethyl iodine silane, which comprises the following steps: adding aluminium, hexamethyldisilazane and iodine in the autoclave; distilling; obtaining the rough product of trimethyl iodine silane; placing rough product in the distilling autoclave; adding copper powder; heating; collecting fraction; obtaining the refined product.

The invention relates to a SiO2 composite aerogel material loaded with a photocatalyst and a preparation method of the SiO2 composite aerogel material, and belongs to the technical field of adsorption/photocatalytic materials. The preparation method of the SiO2 composite aerogel material loaded with the photocatalyst comprises the step of preparing composite gel: dipping SiO2 gel into photocatalyst sol or solution to obtain photocatalyst/SiO2 composite gel; carrying out deposition aging treatment on the obtained photocatalyst/SiO2 composite gel by utilizing alkyl organic solvents, wherein the alkyl organic solvents are hexamethyldisiloxane, alcohol and alkane solvents, and the alkyl organic solvents are respectively hexamethyldisiloxane, alcohol (such as ethanol or isopropanol) and alkane (such as n-hexane or heptane) solvents; then carrying out surface modification and ambient pressure drying to obtain a photocatalyst/SiO2 composite aerogel material; and the prepared photocatalyst/SiO2 composite aerogel is of a mesoporous structure, with a pore diameter of 8-20 nm, a specific surface area of 200-700 m<2>/g, and a pore volume of 0.5-2.0 cm<3>/g.

The invention discloses a high performance polyurethane paint. The high performance polyurethane paint is prepared from water-based polyurethane resin, water-based acrylic emulsion, bisphenol F epoxy resin, toluene diisocyanate, zinc oxide, silicon carbide, zinc stannate, expanded graphite, calcined kaolin, nano titanium dioxide, calcium chloride, coalescing agents, (2, 3-dibromo) boron n-propoxide, hexahydro-1, 3, 5-tris(hydroxyethyl)-s-triazine, modified silica sol, tetrahydro perfluorinated trichlorodecyl-silan, silver stearate, hexamethyldisiloxane, Gamma-isocyanate propyl triethoxy silane, hydroxyl-terminated polybutadiene liquid rubber, defoaming agent, wetting agent, and water. The high performance polyurethane paint has good water resistance and wear resistance, and excellent flame retardant performance.