234 results about "Methylsilane" patented technology

The invention relates to resin for electronic component packaging and a preparation method thereof, and belongs to the technical field of high polymer materials, the resin raw materials comprise epoxy resin, an organosilicon prepolymer, a polyamide acid solution, a modified core-shell structure filler, a polydimethylsiloxane alcohol-methylsilanol-silicate ester cross-linked polymer, a silane coupling agent and the like. The resin matrix adopts an organosilicon-epoxy-polyimide-cross-linked polymer quaternary interpenetrating network, the functional filler adopts a specially modified core-shell heterostructure functional filler, the performance breakthrough is realized through a novel composite system and a step-by-step controllable process, and the composite material has good filling property, thermal conductivity and stability, and is suitable for large-scale production. Good packaging of electronic components can be realized, and the service life is long.

The invention discloses a preparation method of near-stoichiometric ZrB2 doped SiC fibers, which comprises the following steps: preparing a zirconium-containing multiphase ceramic precursor (PZMS) and polymethylsilane (PMS) into a PZMS / PMS mixed precursor, and blending the PZMS / PMS mixed precursor with spinning-grade polycarbosilane (PCS) to obtain a mixed precursor; the ZrB2-doped silicon carbide fiber with the C / Si atomic ratio close to an ideal value is obtained through the processes of melt spinning, electron beam / BCl3 crosslinking-heat treatment, hydrogen high-temperature pyrolysis, high-temperature sintering and the like in sequence, and regulation and control of fiber components are achieved.

The invention belongs to the technical field of thick oil emulsification viscosity reduction, and particularly discloses an amphiphilic Janus carbon nanotube thick oil emulsification viscosity reducer and a preparation method and application thereof, and the preparation method comprises the following steps: firstly, adding a multi-walled carbon nanotube into a strong acid solution; secondly, adding a first solvent, and then adding molten paraffin to obtain paraffin microspheres wrapped by activated carbon nanotubes; thirdly, adding into a second solvent, so as to obtain carbon nanotube paraffin microspheres asymmetrically modified by vinyl trimethylsilane; and finally, adding into a third solvent to react with the first modifier, and then adding into a fourth solvent to react with the second modifier to obtain the viscosity-reduced Janus carbon nanotube. According to the amphiphilic Janus carbon nanotube thick oil emulsifying viscosity reducer as well as the preparation method and the application thereof, the viscosity reduction rate reaches 99.47%, the amphiphilic Janus carbon nanotube thick oil emulsifying viscosity reducer has excellent wetting reversal and interfacial tension reduction capability, the recovery efficiency is improved by more than 25%, and the recovery efficiency improvement effect is remarkable.

The invention relates to the technical field of cosmetics, in particular to a composition, a reagent, application of the composition and the reagent, a generation accelerant of type I collagen and type III collagen and cosmetics. The composition is prepared from the following components in parts by weight: 0.001 to 0.55 part of palmitoyl tripeptide trifluoroacetate, 0.001 to 1 part of methylsilanetriol and 0.001 to 0.55 part of snake venom-like tripeptide. According to the technical scheme provided by the invention, not only can the mitochondrial function be adjusted, but also the expression of HSP47 protein can be promoted, so that the collagen generation of dermis is promoted, the length and the quantity of nasolabial folds are reduced, the skin elasticity is improved, and a good anti-aging effect is shown.

The invention belongs to the field of cosmetics, and discloses a preparation method of a sunscreen synergistic composition, which specifically comprises the following steps: 1, dissolving isostearic acid in a first solvent, adding polymethyl methacrylate into the first solvent, and carrying out ultrasonic or homogeneous dispersion to obtain a mixture; step 2, carrying out solvent removal treatment on the mixture obtained in the step 1; and 3, dissolving trimethylsiloxy silicate ester in a second solvent, adding the product obtained in the step 2 into the second solvent, and uniformly mixing to obtain the sunscreen synergistic composition, the mass ratio of the polymethyl methacrylate to the isostearic acid to the trimethylsiloxy silicate ester is 1: (0.1-0.3): (0.2-0.9). According to the sunscreen synergistic composition prepared by the preparation method disclosed by the invention, the components of the sunscreen synergistic composition can be better compatible, so that the skin feeling of the sunscreen synergistic composition is more velvet, meanwhile, polymethyl methacrylate is firmer and is not easy to migrate or fall off, and the sunscreen effect of the product is favorably improved.

The invention relates to liquid foundation and a preparation method thereof, and belongs to the technical field of cosmetics. The liquid foundation is prepared from the following components in parts by weight: 9.85 to 36.7 parts of colorant composition, 12 to 65 parts of skin conditioner, 2 to 20 parts of emollient, 0.5 to 4 parts of emulsifier, 2 to 45 parts of humectant, 0.5 to 2 parts of filler, 0.2 to 1 part of preservative, 0.05 to 0.5 part of aromatic, 0.02 to 8 parts of plant extract and 8 to 34 parts of water, the skin conditioning agent is prepared from isododecane, trimethylsiloxy silicate ester, isononyl isononanoate, polyglycerol-3 ricinoleate and polyglycerol-10 dioleate. The invention further discloses a preparation method of the skin conditioning agent. The liquid foundation disclosed by the invention has the effects of good flowability, moistening, oxidation resistance and long makeup duration.

The invention discloses an anti-ultraviolet automobile window film and a preparation method thereof, and relates to the field of high polymer materials. When the anti-ultraviolet automobile window film is prepared, methylcyclotetrasiloxane, octamethylcyclotetrasiloxane, 3-glycidyl propyl (dimethoxy) methylsilane and 1, 3-bis (3-aminopropyl)-1, 1, 3, 3-tetramethyldisiloxane are subjected to a reaction, and modified polysiloxane is prepared; the preparation method comprises the following steps: reacting benzo [1, 2-d: 5, 4-d '] bis (oxazole)-2, 6-dithiol with 4-aminobenzoyl chloride to prepare a modified ultraviolet absorbent; isophorone diisocyanate, polytetrahydrofuran ether glycol, the modified polypyrrole particles, the modified polysiloxane and the modified ultraviolet absorbent are subjected to a reaction, and the reaction product is spread in a mold. The anti-ultraviolet automobile window film prepared by the invention has good anti-ultraviolet, heat-insulating, flame-retardant and anti-aging properties and good mechanical properties.

The present invention discloses a hydrophobic Cu / SiO2 catalyst and its preparation and application. The preparation method of the hydrophobic Cu / SiO2 catalyst includes: adding a Cu / SiO2 catalyst into a mixed solution of a hydrophobic treatment agent and an organic solvent, oscillating at 30-60 °C for 1-12 h, filtering after oscillation and washing with ethanol to remove the excess hydrophobic treatment agent, and then drying in an oven at 40-200 °C for 1-24 h to obtain the hydrophobic Cu / SiO2 catalyst; the hydrophobic treatment agent is one or more of methoxytrimethylsilane, trimethylchlorosilane, dimethyldiacetoxysilane, and triisopropyloxysilane. The present invention provides the application of the hydrophobic Cu / SiO2 catalyst in the dehydrogenation lactonization reaction of diglycol, improving the selectivity / yield of the target product.

The invention belongs to the technical field of medicines, and relates to chemical synthesis, in particular to a synthesis process of retinoic acid silane ester. The invention discloses a synthesis process of retinoic acid silane ester. The retinoic acid silane ester is prepared by carrying out nucleophilic reaction on retinoic acid and halomethyltrimethylsilane in the presence of alkali. According to the invention, the raw materials retinoic acid, chloromethane trimethylsilane and cesium carbonate are added into the solvent, the reaction temperature is controlled, after the reaction is finished, the product is obtained through post-treatment crystallization, and according to the synthesis process, the maximum product yield is about 90%.

The invention provides a sandwich-structure bidirectional film-forming composition and a preparation method and application thereof, and relates to the technical field of sunscreen, the preparation method comprises the following steps: mixing isododecane, trimethylsiloxy silicate ester and disteardimonium hectorite to obtain an oil phase mixture; mixing butanediol, the sodium hyaluronate cross-linked polymer and the like to obtain a water-phase mixture; homogenizing the oil phase mixture and the water phase mixture; performing curing reaction and homogenizing pretreatment. According to the sandwich structure disclosed by the invention, the disteardimonium hectorite is taken as a carrier, an oil phase forms an initial hydrophobic membrane, the oil phase expands when encountering water and sweat, sunscreen protection is synergistically enhanced, and the prepared composition of the sandwich structure is good in stability.

The invention relates to the technical field of cables, and provides a high-strength corrosion-resistant flexible cable which sequentially comprises a sheath layer, an insulating layer and a conductor from outside to inside, the sheath layer comprises the following components in parts by weight: 90 parts of composite polyvinyl chloride, 10-15 parts of high-density polyethylene, 6-12 parts of ethylene propylene diene monomer, 3-6 parts of ethylene-methyl methacrylate copolymer, 10-20 parts of filler, 1-2 parts of antioxidant, 2-4 parts of plasticizer, 15-18 parts of flame retardant and 0.5-0.7 part of vulcanizing agent; the preparation method of the composite polyvinyl chloride comprises the following steps: putting polyvinyl chloride into a plasma treatment device, vacuumizing, introducing a plasma gas source, and carrying out etching treatment to obtain the composite polyvinyl chloride, the plasma gas source comprises hexafluoroacetone and methylsilane in a volume ratio of (3-9): 1. According to the technical scheme, the problem of poor corrosion resistance of the cable sheath layer in the prior art is solved.

The invention discloses a low-moisture and high-safety lithium battery diaphragm and a preparation method thereof.The low-moisture and high-safety lithium battery diaphragm comprises a base membrane and a coating on the base membrane, the coating comprises modified gamma-phase superfine porous aluminum oxide, the modified gamma-phase superfine porous aluminum oxide is obtained by modifying gamma-phase superfine porous aluminum oxide through a silane coupling agent, and the modified gamma-phase superfine porous aluminum oxide is prepared from modified gamma-phase superfine porous aluminum oxide. The silane coupling agent is one of a vinyl silane coupling agent and a methyl silane coupling agent. According to the invention, surface modification is carried out on gamma-phase superfine porous alumina by using a silane coupling agent with a hydrophobic group, so that the diaphragm has high ionic conductivity, good high temperature resistance and good liquid absorption and retention capability, and meanwhile, the water content of the diaphragm is reduced.

The invention belongs to the technical field of titanium dioxide composite materials, and discloses a preparation method and application of modified rutile type nano titanium dioxide. According to the preparation method, water and n-hexyl alcohol are taken as a microemulsion system, titanium tetrachloride is taken as a titanium source, lauryl sodium sulfate is taken as a surfactant, and rutile type nano titanium dioxide with good dispersity and small particle size is obtained through hydrothermal reaction; then carrying out surface modification by using toluene-2, 4-diisocyanate, so as to obtain modified rutile type nano titanium dioxide; and carrying out melt blending with a copolymer of styrene and an acrylate dimethylsilane monomer by taking the modified polystyrene as a filler to obtain the polystyrene material. Isocyanate groups contained on the surface of the modified rutile type nano titanium dioxide can react with hydroxyl groups of the polystyrene copolymer, so that the mechanical property, the high temperature resistance and the ultraviolet aging resistance of the material are remarkably improved.

The present invention relates to an anti-sticking and wear-resistant belt for tobacco equipment and a production method thereof, and belongs to the field of tobacco machinery. Specifically comprising the following steps: Step 1, preparing a substrate and a composite resin, wherein the substrate can be a polyester fiber cloth or a nylon cloth according to the use environment. The composite resin material comprises 30-40wt% polysilazane, 10-25wt% dimethylsilane cage-based polysilsesquioxane, 10-30wt% polyimide, 5-20wt% polyurethane, and 10-20wt% filler; Step 2, laying a layer of substrate, depositing and coating the composite resin on the substrate after hot melting at 360°C, and infiltrating; Step 3, shaping the composite resin; Step 4, repeating steps 2 and 3 until the required thickness. The belt prepared by the present invention has low porosity, is colorless and transparent, and is smooth and beautiful. The raw material is food-grade non-toxic and odorless. The belt has good hydrophobic and oleophobic properties. The static angle of natural flavors, nicotine, grease, and other tobacco mixed oil stains is greater than 120 degrees, and the rolling angle is less than 10 degrees.

The invention relates to the technical field of cosmetics, and particularly discloses waterproof oil-control powder with a soft coke effect as well as a preparation method and application of the waterproof oil-control powder. The invention relates to waterproof oil-control powder with a soft coke effect. The waterproof oil-control powder is prepared from the following raw materials in percentage by mass: 60%-70% of synthetic fluorophlogopite, 8%-12% of vinyl polydimethylsiloxane / polymethylsiloxane silsesquioxane cross-linked polymer, 18%-22% of silica, 1%-3% of triethoxyoctyl silane, 4%-5% of zinc oxide, 0.5%-1% of trimethylsiloxy silicate ester and 0.5%-1% of capryloyl glycine. The waterproof oil-control powder with the soft-focus effect not only has good oil-control performance, but also can form a layer of waterproof film on the surface of skin to effectively prevent sweat and moisture from damaging makeup, and meanwhile, the skin texture is improved through the soft-focus effect, so that the makeup is more natural and lasting.

The invention discloses a system and method for preparing tetramethylsilane, wherein the system for preparing tetramethylsilane comprises a raw material tank, a distillation device, an adsorption device and a sub-boiling distillation tower, wherein the raw material tank is used to hold a mixture containing tetramethylsilane, the distillation device comprises a first distillation tower and a second distillation tower, the first distillation tower is connected to the raw material tank and the second distillation tower, the first distillation tower is used to remove chloroalkanes in the mixture to form a first mixture, the second distillation tower is used to remove part of the small molecule alkanes in the first mixture to form a second mixture, the adsorption device is connected to the second distillation tower to remove the small molecule alkanes and olefins in the second mixture and form a third mixture, and the sub-boiling distillation tower is connected to the adsorption device to purify the third mixture to obtain tetramethylsilane. The tetramethylsilane prepared by the system for preparing tetramethylsilane of the invention has high purity and low production cost.

The invention discloses a high-strength acrylate rubber material and a preparation method thereof, and relates to the technical field of high polymer materials. When the high-strength acrylate rubber material is prepared, polyhydroxy imidazolium salt and phosphorus pentoxide react to prepare a functional flame retardant; reacting the pre-modified glass fiber with hydrazine hydrate to obtain modified glass fiber; the preparation method comprises the following steps: carrying out solution polymerization on ethyl acrylate, butyl acrylate, acryloxy propyl bis (trimethylsiloxy) methylsilane and glycidyl methacrylate to prepare acrylate raw rubber; the high-strength acrylate rubber material is prepared by uniformly mixing acrylate raw rubber, the modified glass fiber, a functional flame retardant and triphenyl phosphine, plastifying and thin-passing. The high-strength acrylate rubber material prepared by the invention has excellent flame-retardant, antibacterial, anti-aging and mechanical properties.

The invention discloses an organic silicon resin and a preparation method thereof, and relates to the field of organic silicon resin preparation, the first step is that methylsilane is placed in a stirring barrel, a catalyst is added, a prepolymerization reaction is carried out through catalysis of the catalyst to form an oligomer, after the prepolymerization reaction is completed, a filler and a cross-linking agent are added into the oligomer, and a mixture is obtained; the preparation method comprises the following steps: carrying out cross-linking and curing on a high-energy ultrasonic amplitude-change pole, and carrying out defoaming treatment after cross-linking and curing to remove bubbles in a cross-linked and cured material so as to obtain the organic silicon resin. In actual operation, the arranged ultrasonic generator can transmit ultrasonic waves to the high-energy ultrasonic amplitude-change pole, and the high-energy ultrasonic amplitude-change pole is in contact with the material; compared with the prior art, the reaction kettle has the advantages that sufficient and uniform mixing of various materials in the kettle body can be effectively promoted, segregation of a certain monomer material is avoided, the reaction efficiency is greatly improved, meanwhile, ultrasonic waves can enable high-frequency continuous vibration to be generated among the materials, bubbles in the materials are discharged or broken, and the organic silicon resin structure is tighter.

The invention belongs to the technical field of cosmetics, and particularly discloses a freeze-dried powder base solution and a preparation method thereof. The freeze-dried powder base solution comprises a component A and a component B. The component A is prepared from magnesium potassium fluosilicate, a filling agent, lauroyl lysine, titanium dioxide, CI 77492, CI 77491, CI 77499 and the balance water, butanediol, xanthan gum, a thickening agent, trehalose, polysorbate-60, an emulsifying agent a, phenyl polytrimethylsiloxane, isononyl isononanoate and a preservative. The component B is prepared from the following components: the balance of water, butanediol, a preservative, magnesium sulfate, an emollient, disteardimonium hectorite, phenyl polytrimethylsiloxane, isododecane, trimethylsiloxy silicate ester, an emulsifier b and PEG-10 (Polyethylene Glycol) polydimethylsiloxane. Various raw materials are mixed, so that the obtained liquid foundation has relatively good dispersity, has smooth and refreshing skin feeling, and is prevented from being thick, sticky and greasy.

The invention relates to the technical field of insulating paint, in particular to insulating paint capable of preventing bird damage and foreign matter lap joint and a preparation method of the insulating paint. The invention provides an insulating coating for preventing bird damage and foreign matter lap joint. The insulating coating is prepared from the following raw materials in parts by weight: 55 to 80 parts of methylsilane modified polyurethane liquid, 23 to 40 parts of polyamide fiber nano powder, 10 to 20 parts of organic silicon modified calcium lignosulphonate suspension, 8 to 10 parts of hydrophobic silicon dioxide, 2 to 5 parts of flatting agent, 1 to 2 parts of pigment, 3 to 5 parts of anti-aging agent and 10 to 15 parts of diluent. The insulating property of the coating is extremely high, the withstand voltage value per millimeter can reach 40kV and above, while the withstand voltage value per millimeter of a conventional insulating coating is generally 18kV; and the insulating paint is high in strength and good in toughness, and has good hydrophobicity and hydrophobicity migration.

The invention belongs to the technical field of lithium metal batteries, and particularly relates to a siloxane electrolyte, a preparation method thereof and application of the siloxane electrolyte in a low-temperature lithium metal battery. The siloxane electrolyte is prepared from a lithium salt and dimethoxy dimethyl silane, and the mass ratio of the lithium salt to the dimethoxy dimethyl silane is (0.16 to 0.48) to (0.5 to 1.5). The siloxane electrolyte composition provided by the invention comprises the lithium salt and the dimethoxydimethylsilane, and silicon atoms and adjacent oxygen atoms in the dimethoxydimethylsilane have a d-p conjugation effect, so that the high voltage resistance of the electrolyte is effectively improved, the Li < + >-solvent interaction can be weakened, and the release of lithium ions in the desolventizing process is promoted; by combining a low-temperature formation mode, the electrochemical performance of the lithium battery in a low-temperature interval can be remarkably improved, the lithium battery can be matched with a ternary positive electrode and stably run under the condition of 4.7 V, and the lithium battery has an excellent low-temperature capacity retention rate and has a wide application prospect in the low-temperature lithium metal battery.

The utility model discloses a trimethylsilane production tail gas treatment device which comprises a treatment barrel, a plurality of supporting legs are fixedly arranged at the lower end of the treatment barrel, an upper cover is arranged at the upper end of the treatment barrel, a gas inlet pipe is fixedly arranged at the side end of the treatment barrel, an exhaust pipe is fixedly arranged on the upper cover, and a gas outlet pipe is fixedly arranged on the exhaust pipe. A cleaning structure is movably arranged in the treatment barrel, and the inner wall of the treatment barrel is cleaned through the cleaning structure; the cleaning structure comprises a first middle box, a first spray head and a scraping block, an electric push rod is fixedly arranged on the upper cover, a moving plate is connected to the electric push rod, the cleaning structure is arranged on the moving plate, a recycling structure is arranged at the lower end of the treatment barrel, and the recycling structure comprises a collecting box, a heat accumulator and a cover plate. And waste liquid and heat are recycled through the recycling structure.

The present invention relates to the field of skin cosmetics, and in particular to a soothing, long-lasting, sun-protective isolation cream and its preparation method. The isolation cream's raw materials include butylene glycol, isododecane, polydimethylsiloxane, ethylhexyl salicylate, phenylbenzimidazole sulfonic acid, butyloctanol salicylate, diisopropyl sebacate, diisopropyl adipate, vinyl polydimethylsiloxane / polymethylsilane silsesquioxane crosspolymer, ethylhexyl triazone, p-hydroxyacetophenone, disteardimonium hectorite, aluminum hydroxide, Piper mesenteriae leaf / root / stem extract, Gentiana scabra extract, and water. The isolation cream prepared by the present invention has good soothing, long-lasting, and sun-protective effects, as well as excellent free radical resistance and moisturizing effects. It is easy to apply and can improve skin gloss to a certain extent.

The invention relates to the technical field of cosmetics, and particularly discloses bright non-stick cup lip glaze and a preparation method thereof. The raw materials of the lip glaze comprise the following components in parts by weight: 15 to 40 parts of a solvent, 5 to 15 parts of an emollient, 30 to 70 parts of a film-forming agent, 2 to 20 parts of a brightener, 0.1 to 10 parts of a thickening agent, 3 to 10 parts of a coloring agent, 0.5 to 1.0 part of a preservative, 0.1 to 1.0 part of an antioxidant, 0.1 to 1.0 part of a cool feeling agent, 0.01 to 1.0 part of an active component and 0.01 to 1.0 part of an aromatic, wherein the film forming agent is prepared from an acrylic acid (ester) / polydimethylsiloxane copolymer, polymethyl silsesquioxane, trimethylsiloxy silicate ester and polypropyl silsesquioxane. The lip glaze provided by the invention is not easy to stick to a cup, is lasting, and also has a relatively good light effect.

The invention discloses a preparation method and application of a silicon-based functionalized fluorenyl polysubstituted acetylene copolymer and a gas separation membrane thereof. Belongs to the technical field of polymer material and gas separation. The invention provides a new thought for preparation of a high-permeability gas separation membrane material. The preparation method comprises the following steps: carrying out copolymerization on 1-phenyl-2-(7-trimethylsilyl-9, 9-bis (trimethylsilyl-fluorene-2-yl) acetylene and 1-phenyl-2-(7-trimethylsilyl-9, 9-dimethyl-fluorene-2-yl) acetylene under the catalysis of TaCl5-n-Bu4Sn, so as to prepare a copolymer with high molecular weight; the preparation method comprises the following steps of: carrying out film casting on a solution of the nano-silver oxide, and then carrying out desiliconization treatment by using normal hexane / trifluoroacetic acid to obtain a gas separation membrane with the thickness of 100-220 microns, the specific surface area of 298-492 m / g and the total pore volume of 0.134-0.299 cm / g. The prepared separation membrane has the advantages that the COpermeability is up to 36,900 Barrer, the Opermeability is 19,800 Barrer, the thermal decomposition temperature exceeds 420 DEG C, the separation membrane can be used for separating gases such as COO, ON and the like, the preparation process is simple and convenient, and the industrial potential is realized.

The invention relates to the technical field of batteries, in particular to a battery and a power utilization device, and the battery comprises a positive pole piece, a negative pole piece and electrolyte; the positive pole piece comprises a positive current collector and a positive active layer arranged on at least one surface of the positive current collector, the positive active layer comprises a positive lithium supplement agent, and the positive lithium supplement agent comprises at least one of lithium ferrite and lithium nickelate; the electrolyte comprises a first additive, the first additive comprises a compound with a structure shown in a formula (I), R1, R2 and R3 are respectively and independently selected from one of allyl, divinyl methyl silane, vinyl dimethyl silane or trivinyl silane, and at least one of R1, R2 and R3 is selected from one of divinyl methyl silane group, vinyl dimethyl silane group or trivinyl silane group. By adding the first additive into the electrolyte, dissolution of iron ions or nickel ions in the lithium supplement agent is inhibited, the structural stability of the positive electrode lithium supplement agent is enhanced, and the cycle life of the battery is prolonged.

This invention relates to the field of electrochemical energy storage technology, specifically disclosing a locally high-concentration electrolyte and its preparation method. The electrolyte uses methoxytrimethylsilane and 2,2,2-trifluoroethyl methanesulfonate as the base solvent, ethoxy(pentafluoro)cyclotriphosphazene or 1,1,1,3,3,3-hexafluoroisopropyl methyl ether as the functional diluent, and is compounded with specific proportions of sodium bis(trifluoromethanesulfonyl)imide, sodium hexafluorophosphate as the main salt, and vinyl sulfate and siloxane polymer additives. Through the synergistic effect between the components, while ensuring high ionic conductivity and excellent wettability, it also significantly improves the stability of the negative electrode interface, providing key material support for the development of high-energy-density negative electrode-free sodium metal batteries, and showing broad application prospects in large-scale energy storage, portable electronic devices, and other fields.

The application provides a method for improving the mechanical properties of ceramic matrix composites, and relates to the technical field of ceramic matrix composite preparation. The method uses polymethylsilane (PMS) as a ceramic precursor, silicon carbide powder as a filler, divinylbenzene (DVB) as a cross-linking agent, introduces boron nitride as a sintering aid and a second-phase toughening component, and is prepared through six core processes of constant-temperature mixing under nitrogen protection, carbon fiber cloth vacuum impregnation, laminating exhaust forming, tungsten bead weight matching shaping, two-stage gradient sintering and multiple precursor impregnation and densification to obtain high-performance continuous carbon fiber reinforced silicon carbide composite materials. The sintering promotion effect and dispersion toughening mechanism of boron nitride are used, and the optimized forming process of layer-by-layer exhaust and weight matching shaping is used to effectively reduce the porosity of the matrix, and significantly improve the material density, bending strength and fracture toughness. The process parameters of the application are quantifiable and controllable, the batch stability is high, no special equipment is needed, and the application can be adapted to large-scale production.

The invention relates to the field of cosmetics for skin, in particular to soothing, makeup-holding and sun-screening makeup base cream and a preparation method of the soothing, makeup-holding and sun-screening makeup base cream. The sun screen is prepared from the following raw materials: butanediol, isododecane, polydimethylsiloxane, ethylhexyl salicylate, phenyl benzimidazole sulfonic acid, butyl octanol salicylate, diisopropyl sebacate, diisopropyl adipate, a vinyl polydimethylsiloxane / polymethylsilane silsesquioxane cross-linked polymer, ethylhexyl triazinone and p-hydroxyacetophenone, and the sun screen is prepared from the following raw materials: ethylene glycol, isododecane, butyl octanol salicylate, phenyl benzimidazole sulfonic acid, butyl octanol salicylate, diisopropyl sebacate, diisopropyl adipate, vinyl polydimethylsiloxane and polymethylsilane silsesquioxane. The traditional Chinese medicine composition is prepared from the following raw materials: disteardimonium hectorite, aluminum hydroxide, kava pepper leaf / root / stem extract, radix gentianae extract and water. The make-up base prepared by the invention has good soothing, makeup-holding and sunscreen effects, has excellent free radical resisting and moisturizing effects, is easy to smear, and improves the skin glossiness to a certain extent.

The invention discloses an immersion plating method for a nano-palladium layer on the surface of a bonded oxygen-free copper wire and a palladium-plated bonded oxygen-free copper wire. Relates to the technical field of palladium-plated copper wires. According to the dip plating method for the nano-palladium layer on the surface of the bonded oxygen-free copper wire, the bonded oxygen-free copper wire is soaked in ethyl alcohol to be cleaned and dried for standby application; the preparation method comprises the following steps: dissolving a surfactant, benzotriazole and rosin in an organic solution; adding nano palladium powder to obtain a dip plating solution; carrying out dip plating treatment on the bonded oxygen-free copper wire in the dip plating solution, drying after dip plating, and carrying out vacuum annealing; the surfactant is prepared from methyl amyl alcohol, trimethylsilyl glucoside, sodium dodecyl diphenyl ether disulfonate, a carbon nano tube and deionized water. The surface active agent is added, so that nano palladium particles can be uniformly dispersed in the plating solution, the palladium particles are prevented from being agglomerated, a more uniform and compact palladium plating layer can be obtained, the quality of the plating layer is improved, and the corrosion resistance is better.