89 results about "Hexamethyldisiloxane" patented technology

The invention discloses a preparation method for inhibiting generation of shrinkage cavities on the surface of a pole piece and the pole piece. The method comprises the following steps: S1, pre-activating a base material, and generating a hydrophobic-oleophylic gradient layer by argon and hexamethyldisiloxane mixed plasma; s2, slurry modification: adding a zwitterionic block copolymer and silane modified nano titanium dioxide, and adjusting the surface tension of the slurry to 25-30 mN / m; s3, dynamic flow field coating is conducted, an ultrasonic generator restrains vortex, and the coating speed ranges from 20 m / min to 60 m / min; s4, gradient drying, three-section temperature control and wind speed decreasing are matched with solvent volatilization; and S5, defect repairing, wherein the shrinkage cavity is repaired through laser micro-area remelting in combination with the piezoelectric micro-roller. Compared with the prior art, through cooperation of surface energy gradient matching, flow field regulation and control and online repair, the shrinkage cavity phenomenon of the pole piece can be effectively inhibited, so that the quality and consistency of the pole piece are improved, and the method is suitable for efficient production of high-energy-density batteries.

A display panel includes a light-emitting element layer including a pixel defining layer including a light-emitting opening defined therein corresponding to an exposed portion of a first electrode and a side surface which defines the light-emitting opening, a light-emitting pattern and a second electrode within the light-emitting opening, and an encapsulation layer including an inorganic film which covers the second electrode and the side surface of the pixel defining layer within the light-emitting opening and extends to outside the light-emitting opening in a direction away from the light-emitting opening to define an extended portion of the inorganic film, and a filler including hexamethyldisiloxane which is between the pixel defining layer and the extended portion of the inorganic film.

The invention discloses an acid and alkali resistant and salt spray resistant coating and a preparation method thereof, and relates to the field of coatings. When the acid and alkali resistant and salt fog resistant coating is prepared, 4-imidazole formaldehyde reacts with 3-aminopropyldimethoxymethylsilane and 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, and then reacts with hexamethyldisiloxane, octamethylcyclotetrasiloxane and 2, 4, 6, 8-tetramethylcyclotetrasiloxane to prepare modified polysiloxane; the preparation method comprises the following steps: reacting graphene oxide with 3-aminoethyl thiophene, 3-hexylthiophene and 3-allyl thiophene to prepare modified graphene; the preparation method comprises the following steps: uniformly mixing modified graphene, 1, 3-divinyl-1, 1, 3, 3-tetramethyldisiloxane platinum, a defoaming agent and modified polysiloxane to obtain a component A, taking waterborne epoxy emulsion as a component B, and uniformly mixing the component A and the component B to obtain the acid-alkali-resistant salt-fog-resistant coating. The prepared acid-alkali-resistant salt-fog-resistant coating has good acid-alkali-resistant, salt-fog-resistant, flame-retardant and hydrophobic properties.

The invention relates to the field of coatings, and discloses a self-cleaning nano-coating glass plate and a preparation method and application thereof.The nano-coating is prepared from organic silicon resin, epoxy resin, modified nano titanium dioxide, long-chain alkyl methyl silicone oil, a curing agent and a diluent; the modified nano titanium dioxide is prepared by grafting a modified silane coupling agent and nano titanium dioxide, wherein the modified silane coupling agent is prepared by reacting a modified phosphorus-containing antibacterial monomer with vinyltriethoxysilane; the modified phosphorus-containing antibacterial monomer is prepared by reacting eugenol with N-bromosuccinimide, then reacting with 2-amino-4-methylthiazole, further reacting with diphenyl phosphinyl chloride, and reacting the obtained phosphorus-containing antibacterial monomer with 1, 1, 3, 3-tetramethyldisiloxane; the long-chain alkyl methyl silicone oil is prepared by using octamethylcyclotetrasiloxane, dodecyl methyl dimethoxy silane and hexamethyldisiloxane as raw materials, and the prepared nano coating has a super-hydrophobic surface and also has excellent antibacterial activity, wear resistance and flame retardance.

The invention discloses a hexamethyldisiloxane preparation method capable of purifying a raw material, and relates to the technical field of chemical preparation, the hexamethyldisiloxane preparation method capable of purifying the raw material comprises the following steps: S1, raw material preparation: cooling deionized water through a cooling system, and maintaining the temperature to be less than or equal to 10 DEG C, then injecting part of the cooled deionized water into a tubular reactor, pumping trimethylchlorosilane and methylbenzene into a premixing tank according to a proportion, and uniformly stirring and mixing; s2, catalytic promotion: injecting diluted hydrochloric acid into the tubular reactor, uniformly mixing the diluted hydrochloric acid with deionized water, and maintaining the pH value to 2-3; according to the hexamethyldisiloxane preparation method capable of purifying the raw materials, redundant steps such as catalyst recovery and repeated washing can be omitted through the hydrolysis reaction, the method is suitable for continuous production, meanwhile, the process of the hydrolysis reaction is optimized by changing the use steps and the input method of the deionized water, and the stability in the preparation process is further maintained.

The invention relates to acrylate modified silicone oil, a preparation method and application of the acrylate modified silicone oil in preparation of a photocuring release agent. Belongs to the technical field of organosilicone. The acrylate modified silicone oil is prepared from the following raw materials in parts by mass: 5 to 15 parts of 2-acrylic acid 3-(diethoxymethylsilyl) propyl ester, 80 to 100 parts of a dimethyl cyclosiloxane mixture, 0.06 to 1 part of hexamethyldisiloxane, 0.03 to 1 part of an acid solution and 10 to 30 parts of a dehydrating agent. The used raw materials are few in variety, and the synthesized acrylate modified silicone oil is simple in molecular structure and does not contain functional groups with special structures; the high-viscosity silicone oil with high acrylate content can be synthesized by adopting the 4A molecular sieve and other dehydrating agents in the raw materials.

The invention provides a method for preparing a flame-retardant hydrophobic aerogel composite material by a co-precursor method. The method comprises the following steps: mixing a water glass solution and phosphoric acid for hydrolysis reaction to obtain an acidic hydrolysate; 3-aminopropyltriethoxysilane, water and absolute ethyl alcohol are mixed for a hydrolysis reaction, and alkaline hydrolysate is obtained; mixing and reacting the acidic hydrolysate and the alkaline hydrolysate to obtain a co-precursor prepolymerization solution, continuously adding a water glass solution, and compounding with a glass fiber mat before gelling to form a silicon dioxide wet gel composite mat; sealing and aging the silicon dioxide wet gel composite felt in a precursor solvent, performing surface modification in a mixed solution of hexamethyldisiloxane, absolute ethyl alcohol and hydrochloric acid, and drying to obtain the flame-retardant hydrophobic aerogel composite material. The aerogel has excellent flame retardance and heat insulation property.

The invention discloses a waterproof high-temperature-resistant low-temperature-resistant UV (ultraviolet) photocuring adhesive and a preparation method thereof, and relates to the field of photocuring adhesives. When the waterproof, high-temperature-resistant and low-temperature-resistant UV photocuring adhesive is prepared, clay, maleic anhydride and 2, 6-diaminopyrazine are uniformly mixed to prepare modified clay; the preparation method comprises the following steps: reacting epoxy resin with phosphoric acid di (hydroxyethyl acrylate) ester to obtain modified resin; octamethylcyclotetrasiloxane, mercaptopropyl methyl dimethoxy silane, trifluoropropyl methyl dimethoxy silane and hexamethyldisiloxane are subjected to a reaction, and modified organic silicon is obtained; and uniformly mixing the modified resin, the modified clay, methylboronic acid and the modified organic silicon to obtain the waterproof high-temperature-resistant low-temperature-resistant UV photocuring adhesive. The waterproof, high-temperature-resistant and low-temperature-resistant UV photocuring adhesive prepared by the invention has excellent flame retardance, waterproofness, high-temperature resistance and low-temperature resistance.

The invention discloses silicon dioxide aerogel as well as a preparation method and application thereof. The preparation method of the silicon dioxide aerogel comprises the following steps: 1) preparing silicon dioxide sol; 2) preparing silicon dioxide wet gel; (3) preparing aged silicon dioxide wet gel; 4) soaking the aged silicon dioxide wet gel in a modifier solution prepared from hexamethyldisiloxane, ethanol and hydrochloric acid, and heating and soaking to obtain modified silicon dioxide wet gel; and 5) drying the modified silicon dioxide wet gel to obtain the silicon dioxide aerogel. The silicon dioxide aerogel has the advantages of extremely low density, strong hydrophobicity, excellent heat insulation performance and the like, and can be used in the fields of fire prevention, heat insulation, heat preservation, adsorbents, catalyst carriers, sound insulation and the like, and the preparation method is simple to operate, safe, environment-friendly, low in production cost and suitable for large-scale industrial production and application.

The invention discloses a preparation method of hydrophobic modified silicon dioxide aerogel with low thermal conductivity. The preparation method comprises the following steps: by taking water glass-tetraethoxysilane as a composite silicon source and formamide-ethylene glycol as a retarder, hydrolyzing and mixing, and then adjusting the pH value to trigger sol-gel reaction to form wet gel; after tert-butyl alcohol aging and solvent replacement, hexamethyldisiloxane and hexamethyldisilazane dual modifiers are used for synchronous hydrophobic modification and sodium removal, and the hydrophobic modified low-thermal-conductivity silicon dioxide aerogel with a porous nanostructure is prepared through freeze drying. The method uses the composite silicon source to cooperate with the gel, so that the raw material cost is reduced; a double-modifier synchronous sodium removal process is green and efficient; the obtained aerogel has low thermal conductivity and excellent hydrophobicity, is suitable for the fields of building thermal insulation, industrial thermal insulation, aerospace and the like, and has the advantages of economy and environmental protection.

The invention relates to the field of textile functional finishing agents, in particular to an organosilicon waterproof finishing agent and a preparation method thereof.The preparation method comprises the steps that octamethylcyclotetrasiloxane, hexamethyldisiloxane, tetramethylcyclotetrasiloxane and an initiator are mixed to react, and side chain hydrogen-containing silicone oil is obtained through filtering; the preparation method comprises the following steps: mixing side chain hydrogen-containing silicone oil with 4-vinyl epoxy cyclohexane and a methacrylate compound, reacting under the protection of nitrogen, and adding a catalyst to obtain modified silicone oil; mixing and reacting the modified silicone oil with a coupling agent to obtain amino modified silicone oil; the preparation method comprises the following steps: mixing side chain hydrogen-containing silicone oil with allyl polyethylene glycol for reaction to obtain a nonionic silicon-containing surfactant; and finally, mixing the amino modified silicone oil with a nonionic silicon-containing surfactant, adding an acid solution, and adding water for emulsification to obtain the organosilicon waterproof finishing agent. Through the specific modified silicone oil and the nonionic silicon-containing surfactant, a uniform and stable waterproof film is formed on the surface of the fabric, the waterproof grade is improved, and the waterproof finishing agent is suitable for waterproof finishing of various fabrics.

The utility model relates to the field of chemical equipment, in particular to a hexamethyldisiloxane mixing reaction kettle, which comprises a supporting seat and a mixing kettle, the supporting seat is used as a supporting structure of the mixing kettle, a sealing cover plate is arranged at the top of the mixing kettle, two feeding pipes are arranged at the top of the sealing cover plate and are respectively used for adding a silane precursor and water, and the sealing cover plate is used for sealing the mixing kettle. Each feeding pipe is provided with a valve, a motor is mounted at the bottom in the mixing kettle, and an output shaft of the motor is connected with a stirring paddle. A set of high-precision temperature control system is integrated by the thermal insulation shell, the temperature controller, the circulating pipe, the temperature detector and the controller, temperature change can be quickly responded by utilizing the temperature controller and the circulating pipe, the temperature in the kettle is ensured to quickly reach and be stabilized at a set value, the influence of temperature fluctuation on reaction is avoided, and the temperature in the kettle is continuously monitored by utilizing the temperature detector, so that the reaction time is shortened. And data are fed back to the temperature controller in real time, so that closed-loop control of the temperature is realized, the stability and consistency of reaction conditions are ensured, and the product quality is improved.

The invention belongs to the technical field of siloxane synthesis, and particularly relates to a synthesis process of 3H-heptamethyltrisiloxane. Comprising the following steps: adding methyl hydrogen dichlorosilane, hexamethyldisiloxane and metal chloride into a reaction kettle, carrying out temperature control reaction, and separating to obtain the product. According to the preparation method, metal chloride is taken as a catalyst, and controllable embedding of Si-H bonds and reutilization of the catalyst are realized through an activation-silicon increase reaction of methyl hydrogen dichlorosilane and hexamethyldisiloxane. Potential safety hazards such as acid water or hydrogen release in a traditional process are avoided, and the production efficiency and the safety coefficient are improved. In the raw materials, a Si-Cl bond of methyl hydrogen dichlorosilane is transferred to generate trimethylchlorosilane, and trimethylchlorosilane is used as a synthetic raw material of organic silicon products such as hexamethyldisiloxane and MQ silicon resin, so that the service life of the Si-Cl bond in the organic silicon industry is prolonged, and the production cost is optimized.

The invention provides a continuous production device and method of volatile dimethyl silicone oil, continuous production of the volatile dimethyl silicone oil is realized, the problem of low one-way yield is solved, and the method comprises the following specific steps: S1, vaporizing a dimethyl siloxane ring body and hexamethyldisiloxane through a vaporizer to obtain a gas-phase mixture; s2, introducing the gas-phase mixture into a reaction tower, and generating a dimethyl silicone oil mixture from the gas-phase mixture under the action of a solid acid catalyst; s3, short-chain volatile dimethyl silicone oil in the dimethyl silicone oil mixture is pulled out from the tower top, and a volatile dimethyl silicone oil mixture is obtained; enabling long-chain liquid-phase dimethyl silicone oil to fall into a tower kettle, heating the long-chain liquid-phase dimethyl silicone oil through a reboiler, reentering the reaction tower, and continuously reacting with the gas-phase mixture obtained in the step S1; and S4, further separating the volatile dimethyl silicone oil mixture obtained in the step S3 to obtain MDM, MD2 M and MD3M, and returning the residual MM and dimethyl siloxane ring bodies to the step S1 for recycling.

This application relates to the field of siloxane preparation, specifically disclosing a method for preparing hexamethyldisiloxane, comprising the following steps: A) Concentrated hydrochloric acid and trimethylchlorosilane are sequentially fed into a hydrolysis reactor for hydrolysis to obtain hydrolysis products; the hydrolysis reactor includes a stirred tank, the bottom wall of which is provided with elastic hollow spheres; B) The obtained hydrolysis products are fed into a heat exchanger, then into a gas-liquid separation tower, and finally into a purification condenser; C) The mixture of hexamethyldisiloxane and concentrated hydrochloric acid obtained from the bottom of the gas-liquid separation tower and the mixture of hydrochloric acid and hexamethyldisiloxane obtained from the bottom of the condenser are fed into a separator for separation; the upper oily liquid is separated into a hexamethyldisiloxane washing tank, and after washing, crude hexamethyldisiloxane is obtained and fed into a hexamethyldisiloxane intermediate tank. The preparation method of this application has the advantage of improving the production efficiency and yield of hexamethyldisiloxane.

The application discloses a kind of polymer resin for photoresist, negative photoresist and recycling method.The preparation method of polymer resin is: using functional polycarbonate, p-acetyl oxystyrene, initiator, star-shaped RAFT agent to prepare polymer resin.Using 2-benzyl (methyl) amino-9H-thioxanthene-9-ketone, 3-chloropropyl triethoxysilane, potassium carbonate, triethoxysilane compound and 1,1,1,1,3,3,3-hexamethyl disiloxane to prepare photo initiator.Photolithography is compounded by polymer resin, photo initiator and additive, solvent.The negative photoresist has good thermal stability, and can be recycled by specific filter film, and the recovery rate is 79-83%.The application combines chain free volume design and mobility control, and improves the glass transition temperature of material;And photoresist waste liquid can be recycled.The negative photoresist can be used in wafer level advanced packaging, micro-nano processing, high-end optics and other fields.

The invention belongs to the technical field of aerogel preparation, and relates to a method for preparing a silicon dioxide aerogel felt through catalysis of acid ion exchange fibers. The method for preparing the silicon dioxide aerogel felt through catalysis of the acid ion exchange fibers comprises the steps that an aerogel base material fiber felt and an ion exchange fiber felt are stacked and rolled into a roll shape, and the roll shape is coaxially arranged on a reel arranged in a reaction kettle; injecting an aerogel precursor prepared in advance into the reaction kettle until the coiled material base material is immersed to form a gel aerogel fiber felt; immersing the fiber felt in a hexamethyldisiloxane hydrophobic modification liquid, heating and aging for a certain time, and discharging the modification liquid; and heating and drying the aerogel fiber felt by hot nitrogen air blast to obtain the finished product silicon dioxide aerogel felt. Through an acid ion exchange fiber catalysis process, the reaction condition is mild, the reaction rate is effectively improved, the production period is shortened, and the catalyst does not need to be separated, can be recycled for multiple times, is pollution-free and environment-friendly, and has a relatively large aerogel mass production prospect.

The invention discloses a primer for silica gel composite cloth and a preparation method thereof, and belongs to the technical field of primer and preparation thereof.The preparation method comprises the following steps that vinyl silicone oil and silazane are added into a reaction kettle and stirred, fumed silica is added after stirring, then deionized water is added and fully stirred, and after stirring is completed, heating and vacuumizing are conducted to prepare a base material A; dMC, hexamethyldisiloxane, deionized water and tetramethyl amine hydroxide are added into the reaction kettle, heating and stirring are conducted, the temperature is gradually increased, and silicone oil B is prepared; adding silicone oil B and a coupling agent KH560 into the reaction kettle, fully stirring, gradually adding fumed silica, adding deionized water, stirring, heating, and vacuumizing to obtain a base material C; and preparing the base material A, ethynyl cyclohexanol, chloroplatinic acid, silicone oil containing hydrogen at the end side, the base material C and vinyl silicone oil into the primer. According to the primer for the silica gel composite cloth and the preparation method of the primer, the prepared primer is good in storage stability and good in adhesive property.

The invention discloses a resin material for 3D printing and a preparation method thereof, and relates to the technical field of photosensitive resin materials. When the resin material for 3D printing is prepared, 3-isocyanate propyl methyl dimethoxy silane is blocked by p-nitrophenol, so that blocked 3-isocyanate propyl methyl dimethoxy silane is prepared; the preparation method comprises the following steps: carrying out condensation on blocked 3-isocyanate group propyl methyl dimethoxy silane, 3-mercaptopropyl methyl dimethoxy silane and hexamethyldisiloxane, so as to prepare blocked isocyanate group mercapto silicone oil; the preparation method comprises the following steps: loading a resorcinol bis (diphenyl phosphate) flame retardant on glass flakes modified by silane to prepare flame-retardant modified glass flakes; the preparation method comprises the following steps: reacting epoxy acrylate, blocked isocyanate sulfydryl silicone oil, acryloyl morpholine and a photoinitiator to prepare photosensitive resin, and compounding the photosensitive resin with flame-retardant modified glass flakes to prepare the resin material for 3D printing. The prepared resin has high mechanical property, flame retardant property and thermal stability.

Various exemplary devices, systems, and methods for multi-layer anti-stick coatings for surgical tools are provided. In general, a method of manufacturing a surgical tool includes forming, using plasma enhanced chemical vapor deposition with hexamethyldisiloxane as a precursor material, a first coating on a conductive tissue treating surface of the end effector and a second jaw component of the end effector, the first coating comprising a first material, wherein the first material is a first silicone material, and applying a second coating on top of the first coating on the first jaw component and the second jaw component, the second coating comprising a second material, wherein the coatings are effective to prevent tissue sticking to the jaws during an electrosurgical sealing procedure.

The invention discloses a hexamethyldisilazane separation and purification process and system. The process comprises: adding the solid-liquid mixed reaction material from the hexamethyldisilazane reactor into a cylindrical cone filter, and sending the extruded reaction material to a reaction material intermediate tank; injecting a saturated ammonium chloride solution into the cylindrical cone filter, and extruding the saturated ammonium chloride solution containing a small amount of hexamethyldisiloxane and hexamethyldisilazane; vacuum drying the cylindrical cone filter, and discharging ammonium chloride crystals as a by-product; the reaction material in the reaction material intermediate tank enters an alkali washing tower after enhanced mixing in a static mixer, and the residual ammonium chloride is removed by alkali washing; the liquid-liquid two-phase discharged from the alkali washing tower enters a liquid separation tank, and the water phase is separated at the bottom of the liquid separation tank, and the water phase is divided into two streams, one of which is sent for treatment as waste liquid, and the other is circulated back to the static mixer, and the organic phase is separated at the top of the separation tank, and the organic phase contains hexamethyldisiloxane and hexamethyldisilazane, and is sent to a distillation unit to purify the hexamethyldisilazane product.

The invention provides a method for preparing aerogel powder from waste gel, and belongs to the technical field of aerogel material preparation. The method comprises the following steps: by taking waste wet gel generated when an aerogel product is produced from an organic silicon source as a raw material, adding an ammonium fluoride solution, stirring and uniformly mixing, adding hexamethyldisiloxane, n-butyl alcohol and hydrochloric acid for modification, cooling and standing after modification, and separating out an upper-layer gel solution; stirring and cleaning with pure water, standing to obtain washing water, adding a sodium hydroxide aqueous solution, stirring and cleaning, and standing to obtain alkali washing water; and drying through closed-loop spray drying equipment to obtain the aerogel powder. According to the method, resource utilization of the waste gel is achieved, the production cost of the aerogel powder is reduced, environmental pollution is reduced, and the obtained aerogel powder has good hydrophobicity and heat insulation performance.

A solvent composition has an oxygenated solvent and a siloxane solvent. In one embodiment, the oxygenated solvent is propylene glycol methyl ether and the siloxane solvent is hexamethyldisiloxane or octamethyltrisiloxane. In another embodiment, the solvent composition is an azeotrope of propylene glycol n-butyl ether and decamethyltetrasiloxane. The siloxane solvent can be used in any situation where one desires to remove a silicone deposit, e.g., conformal coatings, adhesives, sealants, greases, heat transfer fluids, paints, oils, etc.

The invention discloses high-refraction phenyl silicone oil and a preparation method thereof, and relates to the technical field of organosilicone, the high-refraction phenyl silicone oil comprises the following raw materials: phenyl trichlorosilane, diphenyl dichlorosilane, methyl trichlorosilane, dimethyl dichlorosilane, hexamethyldisiloxane, a catalyst and a solvent; the preparation is performed based on the raw materials. According to the invention, by reasonably regulating and controlling the ratio of the phenyl trichlorosilane to the diphenyl dichlorosilane, premature crosslinking of the system is avoided while high refractive index is maintained; by introducing methyl trichlorosilane and dimethyl dichlorosilane, the flowability and viscosity are accurately adjusted, and the optical performance and the processability are both considered; and hexamethyldisiloxane is added in batches in the condensation stage to form a uniform end sealing structure, so that the high-refraction phenyl silicone oil with narrow molecular weight distribution and stable and controllable refractive index is obtained. The transparency and the thermal stability of the material are improved, and the bivariate accurate matching capability of the refractive index and the viscosity is remarkably improved.

The invention discloses tris (trimethylsilyl) phosphate and a preparation method thereof, and belongs to the field of chemical synthesis. The invention relates to a preparation method of tris (trimethylsilyl) phosphate, in particular to a preparation method of tris (trimethylsilyl) phosphate, which comprises the following steps: hexamethyldisiloxane and phosphorus pentafluoride are subjected to heating reaction under a stirring condition to obtain tris (trimethylsilyl) phosphate, and the molar ratio of hexamethyldisiloxane to phosphorus pentafluoride is (5-10): 1. Phosphorus pentachloride is replaced with phosphorus pentafluoride, and due to the fact that fluorine atoms are small in radius and large in electronegativity, phosphorus is high in electropositivity and small in steric hindrance, phosphorus pentafluoride can react with hexamethyldisiloxane more easily, a catalyst is not needed, the cost of tris (trimethylsilyl) phosphate can be greatly reduced, and the yield of tris (trimethylsilyl) phosphate is high.

The invention relates to the technical field of organic silicon materials, in particular to an efficient synthesis process of high-hydrogen-content silicone oil. The process comprises the following steps: firstly, mixing and filtering methyl hydrogen ring body and hexamethyldisiloxane in an inert atmosphere to prepare a refined raw material solution, and then dispersing a special and magnetically separable sulfonic acid carbon-silicon composite solid acid catalyst into part of the raw material solution to form a stable suspension; and pumping the mixture and the residual raw material solution into a micro-channel reactor for ring-opening polymerization and equilibrium reaction, and then carrying out three-stage gradient vacuum low-temperature removal purification. According to the process, Si-H bond side reaction is effectively inhibited, efficient magnetic separation and recovery of the catalyst are achieved, and the obtained product is high in hydrogen content, narrow in molecular weight distribution, light in color, good in stability and suitable for high-end application.

The invention discloses a corrosion-resistant aluminum alloy and a preparation method thereof, and relates to the field of aluminum alloys. When the corrosion-resistant aluminum alloy is prepared, palygorskite reacts with mercaptopropyltrimethoxysilane, then p-vinylphenylboronic acid and N-[2-(dimethylamino) ethyl] acrylamide are grafted, then the reaction product reacts with bromohexane, and functionalized palygorskite is obtained; aluminum alloy powder and stearic acid are subjected to ball milling, hot pressing and anodic oxidation to obtain pretreated aluminum alloy; the preparation method comprises the following steps: reacting 2, 4, 6, 8-tetramethylcyclotetrasiloxane, 3-aminopropylmethyldimethoxysilane and hexamethyldisiloxane, and sequentially grafting 3-formylphenylboronic acid and acrylic acid to obtain modified polysiloxane; and uniformly mixing the modified polysiloxane and the functionalized palygorskite, and depositing the mixture on the surface of the pretreated aluminum alloy to obtain the corrosion-resistant aluminum alloy. The corrosion-resistant aluminum alloy prepared by the invention has excellent antibacterial, corrosion-resistant and mechanical properties.

The application discloses a recycling method of reflux condensate in liquid silicone rubber base glue preparation, and water in the reflux condensate generated in the liquid silicone rubber base glue preparation process is removed first; the reflux condensate after water removal can be used for base glue preparation instead of part of silazane, and can also be added into an enamel reaction kettle, concentrated sulfuric acid is added, the temperature is increased to 50-100 DEG C, and after 1-5 hours of reaction, the sulfuric acid is removed by layering, the sulfuric acid can be reused to base glue tail gas absorption, and the remaining reflux condensate is washed to neutral, and hexamethyldisiloxane can be obtained by rectification. The effective recycling of the reflux condensate is solved, and cost reduction and benefit increase are realized.

The application belongs to the technical field of compound preparation, and particularly relates to a preparation method of an alkali metal salt of an oxalate chelate structure, at least comprising the following steps: mixing tris(trimethylsilyl) phosphate, an oxalate and a phosphorus-containing or boron-containing fluorine compound in a first organic solvent, stirring and heating to obtain lithium phosphate, trimethyl fluorosilane gas, and difluorobisoxalate phosphate or difluorooxalate borate, filtering the reaction solution to obtain lithium phosphate solid and a difluorobisoxalate phosphate solution or a difluorooxalate borate solution; adding a second organic solvent for recrystallization after concentration; and obtaining difluorobisoxalate phosphate or difluorooxalate borate solid after filtration, and drying the solid under reduced pressure to obtain a finished product. The process is simple, and the cost is low. By-products lithium phosphate, potassium fluoride and hexamethyldisiloxane can be directly sold as products after purification. Therefore, the application has an atomic utilization rate close to 100%, no invalid waste, less three-waste emissions, and is friendly to the environment.

The invention provides the preparation method of the heat-resistant methyl phenyl silicone oil, the process is simple and convenient, the arrangement of methyl phenyl structural units is uniform, and the content of ethyoxyl is low. The preparation method comprises the following steps: carrying out partial monomer modification on methylphenylsiloxane hydrolysate by adding a metal compound to form a stable Si-O-M bond (M is a metal component), carrying out two-stage equilibrium reaction on methylphenylsiloxane condensate and hexamethyldisiloxane, supplementing an alkaline catalyst, deionized water and a polar solvent in the second-stage reaction, and carrying out polymerization reaction to obtain the high-molecular-weight polydimethylsiloxane. The hydrolysis of residual alkoxy and the condensation of hydroxyl are promoted, the arrangement of a methyl phenyl structure unit and the precise control of an impurity end-capping group are synergistically realized, and the thermal stability of the methyl phenyl silicone oil is greatly improved.