359 results about "Silazane" patented technology

The invention discloses a gel solid electrolyte, a preparation method thereof and a lithium ion battery, and relates to the technical field of batteries. The gel solid electrolyte comprises the following components: a solvent, a lithium salt, an inorganic salt or an organic small molecule additive, an ester cross-linking agent polymeric monomer, a silazane polymeric monomer, a diluent and an initiator, the invention also provides a lithium ion battery comprising the gel solid electrolyte and a preparation method of the lithium ion battery. The preparation method has the beneficial effects that by introducing the silazane polymeric monomer and the ester cross-linking agent polymeric monomer, the silazane polymeric monomer and the ester cross-linking agent polymeric monomer can be subjected to a copolymerization reaction, so that in-situ curing of the electrolyte is realized. The silazane fragment in the high-molecular polymer skeleton can effectively realize the constraint on strong Lewis acid substances such as PF5 and can also remove hydrofluoric acid and trace water so as to realize the protection of positive and negative active materials.

The invention provides a polysilazane green special refractory ceramic coating and a preparation method thereof, and belongs to the field of ceramic coatings. The ternary core material composed of titanium carbide, zirconium boride and silicon nitride provides high hardness, oxidation resistance, thermal shock resistance and excellent thermal stability; the silicon dioxide-aluminum oxide composite shell layer remarkably improves the oxidation resistance and reliability of the coating through the synergistic oxidation resistance and crack self-repairing function; the multi-metal oxygen cluster network endows the coating with excellent electrical conductivity, thermal conductivity and corrosion resistance; the intercalated montmorillonite enhances the crack resistance and oxidation resistance through a layered structure and embedded active ions; and the boron nitride coated vanadium carbide particles provide lubricity, oxidation resistance and wear resistance. Through collaborative optimization of multiple components, the comprehensive performance of the coating is comprehensively improved in the aspects of oxidation resistance, thermal conductivity, interface stability, high-temperature performance, mechanical performance and the like, so that the coating shows excellent long-term stability and functionality in an extreme environment.

The invention discloses a graphite piece silicon carbide coating and a preparation method thereof, and belongs to the technical field of inorganic non-metallic materials. The method comprises the following steps: firstly, carrying out surface polishing, cleaning and drying pretreatment on a graphite piece; then a solution containing phosphinazine functionalized silazane and a boron-silicon carlamide compound is adopted for spraying the pretreated graphite piece, drying and curing are conducted, and a surface modification layer is formed; and finally, placing the surface-modified graphite piece in chemical vapor deposition equipment, and depositing at specific temperature, pressure and atmosphere to form the silicon carbide coating. According to the method, uniform nucleation and crystallization of the silicon carbide coating are effectively promoted through unique surface modification treatment, and the compactness and uniformity of the coating and the binding force of the coating and a matrix are remarkably improved. The obtained coating graphite piece has excellent thermal corrosion resistance, oxidation resistance and mechanical property, the service life and the use frequency of the coating graphite piece in semiconductor epitaxial equipment are remarkably prolonged, the whole preparation process is environmentally friendly, and the coating graphite piece is suitable for coating treatment of a large graphite base material.

The invention discloses a synthesis method of phosphorus-containing polysilazane. The synthesis method comprises the following steps: S1, preparing solid methyl hydrogen polysilazane; s2, solid methyl hydrogen polysilazane is dissolved in an organic solvent, phosphate ester is added, the mixture is stirred to be uniform, then a Karst catalyst is added, and a phosphorus-containing polysilazane solution is obtained after a heating reaction. The phosphorus-containing polysilazane solution obtained through combined action of polysilazane and phosphate containing a vinyl structure is applied to an anti-corrosion coating, the anti-corrosion coating with the thin thickness can be obtained, and the adhesive force and the salt spray resistance are excellent. According to the invention, self-made phosphorus-containing polysilazane is adopted, phosphate is connected to polysilazane through chemical modification, the salt spray resistance effect is improved, the storage stability is good, phosphorus liquid passivation treatment is not needed, and the process is green and environment-friendly.

The invention provides a diaphragm and a preparation method thereof and a lithium ion battery, the diaphragm comprises a base membrane layer and a composite functional layer, the composite functional layer comprises hydrophobic SiO2 aerogel modified by a hydrophobic agent, a conductive ion polymer and a solid electrolyte, and the composite functional layer respectively accounts for 3-12wt%, 0.5-1.0 wt% and 0.5-1.5 wt% of the total mass of the diaphragm; the hydrophobic agent comprises trimethylchlorosilane, hexamethyldisilazane, perfluorooctyltriethoxysilane, polyvinylidene fluoride, polydimethylsiloxane and the like, the conductive ionic polymer comprises polyvinylpyrrolidone, lithium polymethacrylate, lithium polystyrene sulfonate, polyacrylamide and the like, and the solid electrolyte comprises lithium lanthanum titanium oxide, lithium lanthanum zirconium oxide, lithium lanthanum zirconium tantalum oxide and the like. The wettability is improved by the high porosity of the hydrophobic SiO2 aerogel, the stability and strong conductivity of a physical conductive network of the solid electrolyte and the ion affinity and amphoteric binding capacity of the conductive ion polymer are optimized, the electrochemical performance and thermal stability of the interface are optimized, and comprehensive optimization of the thermal-electric-interface performance of the diaphragm is realized through combination.

The invention provides a high-purity silicon carbide ceramic material which is of a structure prepared by adding an additive into silicon carbide powder prepared from polycrystalline silicon powder and high-purity carbon powder and sintering, the silicon carbide powder comprises one or more of a 4H crystal form, a beta crystal form and an alpha crystal form, and the additive is polycarbosilane, polycarbosilazane, polycarbosiloxane or silicon carbide nanowhiskers; wherein the molar ratio of the silicon powder to the carbon powder is 1: (1-1.1); and the additive accounts for 0-1% of the total mass of the silicon carbide powder and the additive powder. Meanwhile, the invention further provides a preparation method of the material, impurities in the raw materials are effectively removed through a liquid phase reaction, the purity of the raw material powder is improved from the source, and the problem that the impurities of the silicon carbide powder are difficult to remove is solved.

The invention provides an electrolyte and a silicon-based lithium ion battery. The electrolyte comprises a lithium salt, an organic solvent and an additive, the mass ratio of the additive in the electrolyte is 0.1%-10%, and the additive comprises a sulfur-containing compound and a silazane compound. The sulfur-containing compound has stronger electrochemical reduction tendency and can be preferentially reduced to generate an SEI film, meanwhile, the formed SEI comprises Li2SO3, CH3CH (OSO2Li) and the like, and the components can improve the stability of the SEI film and inhibit the volume expansion of the silicon negative electrode. The silazane compound can form a protective film containing a silicon-nitrogen bond on the surface of the negative electrode, so that the thermal stability and the electrochemical stability of the electrolyte are improved. According to the electrolyte formula disclosed by the invention, the problem of poor cycling stability of the silicon-based lithium ion battery is effectively solved by controlling the types and the concentrations of the additives and utilizing the synergistic effect, and the first effect of the silicon-based lithium ion battery is also improved.

The invention belongs to the field of epoxy resin composite materials, and particularly relates to a high-heat-resistance degradable epoxy resin composite material and a preparation method thereof.The high-heat-resistance degradable epoxy resin composite material is prepared by using ester-based structure epoxy resin as matrix resin, selecting benzoxazine as reinforced resin, using a phosphorus-containing polysilazane derivative as a modifier and using anhydride as a curing agent; the high-heat-resistance degradable epoxy resin composite material is prepared by taking epoxy resin as a raw material and an amine accelerant as an accelerant through mixing, pouring, curing and forming. The high-heat-resistance degradable epoxy resin composite material disclosed by the invention has excellent degradation capability in an alkaline solution at the temperature of 80-150 DEG C; the heat resistance is excellent, and the glass transition temperature can reach 185 DEG C; meanwhile, the high mechanical strength is achieved.

The invention relates to the technical field of high polymer materials and preparation, and discloses a high-temperature-resistant ceramic polymer-derived ceramic precursor resin molding compound and a preparation method thereof. The high-temperature-resistant composite material is prepared from the following raw materials: 100 parts of high-molecular methyl hydrogen solid polysilazane resin, 1.0 to 5.0 parts of organic silicon plastic modifier, 30 to 40 parts of hybrid fiber, 1.0 to 5.0 parts of fiber sizing agent, 20 to 25 parts of high-temperature-resistant active filler, 10 to 15 parts of fluxing agent, 1.0 to 5.0 parts of high-temperature-resistant lubricant, 0.01 to 2.50 parts of curing agent, 0.1 to 5.0 parts of release agent and 1.2 parts of high-temperature-resistant pigment. Wherein the fiber sizing agent is one or more of epoxy resin, hexamethyldisilazane and polydopamine. The high-temperature-resistant ceramizable polymer derived ceramic precursor resin molding compound provided by the invention has good processability and relatively high ceramic yield.

The invention relates to a hydrophobically modified aluminum oxide and polytetrafluoroethylene composite film as well as a preparation method and application thereof. According to the present invention, the aluminum oxide is firstly subjected to hydroxylation treatment, and then the surface of the aluminum oxide is subjected to hydrophobic treatment by using cyclosilazane, such that the Al-OH content of the prepared hydrophobic modified aluminum oxide surface is low, such that the water absorption rate of the aluminum oxide-PTFE composite film is low, and the aluminum oxide-PTFE composite film is not easily interfered by moisture, and has good electrical insulation performance. In addition, amino groups (-NH2) or imino groups (-NH-) are further introduced into the surface of the hydrophobic modified aluminum oxide and can form hydrogen-bond interaction with C-F bonds in PTFE, so that the compatibility of the hydrophobic modified aluminum oxide and the PTFE is improved, and the mechanical property of the aluminum oxide-PTFE composite film can still be kept under the condition of high addition amount of aluminum oxide.

The invention belongs to the technical field of nanofiltration, and provides a preparation method of a recrystallized silicon carbide-silicon carbonitride ceramic membrane. The preparation method comprises the following steps: applying a polysilazane solution to a porous substrate for the first time, and then performing first pyrolysis to obtain a pyrolysis material; and applying a polysilazane solution on the pyrolysis material for the second time, and then carrying out second pyrolysis to obtain the recrystallized silicon carbide-silicon carbonitride ceramic membrane. According to the invention, a solution containing propargyl polysilazane or organic polysilazane Durazane 1500 quick-drying resin is used as a precursor to prepare the ceramic membrane, and the ceramic membrane has the advantages of high ceramic yield, excellent high-temperature stability, high retention rate and controllable microstructure, and is suitable for separation and protection application in extreme environments.

The invention discloses a preparation method of a low-cost in-situ doped silicon nitride fiber, which comprises the following steps: taking one or two of vinyl liquid polycarbosilane and vinyl polysilazane as a precursor, adding a boron monomer, an organic solvent and metallocene, and doping to prepare a doped silicon nitride fiber containing boron, titanium, hafnium, zirconium and other elements; carrying out melt spinning on the doped precursor to obtain a doped precursor; then boron-containing active gas introduced in the crosslinking process can be combined with active sites on the surface of the protofilament fiber or directly deposited on the surface of the fiber; and finally, the boron-containing active gas reacts with ammonia gas in the high-temperature sintering process to generate a boron nitride (BN) surface coating. Thus, the temperature resistance of the silicon nitride fiber is improved, the problem that a coating of a prefabricated body of a silicon nitride fiber ceramic matrix composite material with a complex structure is not uniform is solved, meanwhile, high cost of a secondary coating and large damage to the fiber are avoided, the composite material preparation process flow is simplified, and the invention provides the low-cost preparation method for in-situ doping of the silicon nitride fiber.

The invention relates to a heat-dissipating and breathable exhaust insole and a preparation method thereof. The insole is obtained by weaving a braided rope, the braided rope is obtained by twisting a plurality of polyamide fiber yarns, and a heat-conducting coating layer is arranged on the surface of at least one polyamide fiber yarn. The heat-conducting coating layer is prepared from the following raw materials in parts by weight: heat-conducting filler, methyl vinyl silicone rubber, carboxyl-terminated polycaprolactone, aminopropyl double-terminated polydimethylsiloxane, silazane, maleic anhydride graft, a diluent, an inhibitor and platinum water. The dispersity and compatibility of the heat-conducting filler are promoted through silazane and aminopropyl double-terminated polydimethylsiloxane, and then the heat-conducting filler is matched with the methyl vinyl silicone rubber, the carboxyl-terminated polycaprolactone and the maleic anhydride graft, so that a heat-conducting coating layer obtained after curing is stably adhered to the surface of the polyamide fiber yarn; and meanwhile, the insole has better moisture absorption, elasticity and heat conduction performance, so that the woven insole has better air permeability, heat dissipation performance and comfort.

The invention provides an application of a surface conditioning agent in an aluminized neodymium-iron-boron magnet. The surface conditioning agent is prepared from the following components in parts by mass: 1 to 10 parts by weight of tetramethyl divinyl disilazane, 40 to 60 parts by weight of acrylic resin, 1 to 10 parts by weight of anionic surfactant, 1 to 20 parts by weight of dispersing agent and 1 to 20 parts by weight of stabilizing agent. The surface conditioning agent for the aluminized neodymium-iron-boron magnet, which is designed by the invention and has specific composition and proportion, can improve the performance of a neodymium-iron-boron magnet coating, especially the surface tension. According to the invention, a solution soaking process is adopted, and a soaking process of a surface conditioning agent is added on an aluminum alloy coating on the surface of a neodymium iron boron matrix, so that the surface tension of the coating can be remarkably improved, meanwhile, a certain effect on improving the corrosion resistance of the coating can be achieved, and the technical problems existing in vacuum aluminum plating can be effectively solved. The method does not need post-treatment, is simple in process and low in cost, does not generate waste gas / slag, and has good environmental protection property.

The invention belongs to the technical field of nano material preparation, and particularly relates to a silicon nitride nanowire and a preparation method thereof. Comprising the following steps: (1) mixing vinyl polysilazane and acrylic acid 2-isocyano ethyl ester, and carrying out stirring reaction under a vacuum condition to obtain A-PSZ; (2) the A-PSZ is put into a vacuum drying oven to be subjected to thermocuring treatment, and cured A-PSZ is obtained; (3) putting the cured A-PSZ into a tubular furnace, and introducing N2 to carry out pyrolytic reaction; and (4) taking out the sample after the pyrolytic reaction, collecting a product generated on the surface of the sample, and sequentially carrying out acid washing and alkali washing treatment to finally obtain the silicon nitride nanowire. According to the method, acrylate modified polysilazane is taken as a raw material, precursor pyrolysis and carbon thermal reduction are combined, the prepared silicon nitride nanowire is high in purity and uniform in morphology, meanwhile, a catalyst and a toxic and harmful nitrogen source do not need to be used in the preparation process, and the method is environmentally friendly and suitable for large-scale industrial production.

Provided is a novel cross-linked polysilazane which is capable of forming a silicon-containing film having excellent crack resistance while being capable of forming a thick film. The invention relates to cross-linked polysilazane with a certain structure.

The invention relates to the technical field of coatings, and discloses a polysilazane-graphene composite electrical equipment insulating and pressure-resistant protective coating and a preparation method thereof. The flame-retardant coating is prepared from the following raw materials in parts by mass: 30 to 50 parts of polysilazane, 3 to 5 parts of telomer, 1 to 3 parts of synergist, 4 to 5 parts of modified silicon dioxide, 4 to 5 parts of modified graphene, 1.5 to 2 parts of multiwalled carbon nanotube, 0.5 to 2 parts of modified zinc oxide, 1 to 2 parts of fluorocarbon surfactant and 130 to 230 parts of tetrahydrofuran. By introducing the telomer, the adhesive force of the coating on a rusty surface is effectively improved, and the properties of high temperature resistance, insulation and pressure resistance, flame retardance, water resistance, ice condensation resistance and the like are enhanced; by introducing the synergist, the modified silicon dioxide, the modified graphene, the multi-walled carbon nanotubes and the modified zinc oxide, the protection capability is further improved. Therefore, the coating disclosed by the invention is excellent in comprehensive protection performance, can meet the long-term operation requirement of power equipment in a complex and severe environment, and is wide in application prospect.

The invention provides acid and alkali resistant and high temperature resistant room temperature vulcanized silicone rubber and a preparation method thereof, and belongs to the technical field of silicone rubber. The acid and alkali resistant and high temperature resistant room temperature vulcanized silicone rubber comprises a component A and a component B which are mixed according to a mass ratio of 10: 1, and the component A comprises 100 parts of a, w-dihydroxy polydimethylphenyl siloxane, 10-20 parts of white carbon black, 30-40 parts of silica powder and 2-5 parts of a heat resistant additive; the component B comprises 100 parts of dimethyl silicone oil, 200 parts of black paste, 100-150 parts of a cross-linking agent, 25-50 parts of a coupling agent and 15-25 parts of a catalyst; through cooperative use of a, w-dihydroxy polydimethylphenyl siloxane, a heat-resistant additive treated by silazane, fumed silica treated by silazane, silica powder and the like, it is guaranteed that the silicone rubber product has the characteristics of acid and alkali resistance and high temperature resistance, and actual requirements are met. In addition, the related preparation method is simple and convenient to operate, and does not need harsh conditions.

The invention provides a high-voltage-resistant polysilazane-based insulating material for a power battery pack of a new energy automobile and a preparation method of the high-voltage-resistant polysilazane-based insulating material, and belongs to the technical field of insulating materials. The silicon carbide microspheres are prepared through reaction of polycarbosilane and polyaniline, and through hydrothermal deposition of molybdenum disulfide and coating of organic boron, the heat-conducting property, the electrical insulating property and the flame retardant property of the silicon carbide microspheres are improved; secondly, the prepared metal organic supramolecular cage is subjected to carbon nitride modification and surface modification, so that the thermal conductivity, the interface bonding force and the dielectric property of the metal organic supramolecular cage are improved; in addition, the carbon nanotubes are subjected to acid treatment, rare earth lanthanum modification and boron nitride compounding, so that the dispersity, the thermal conductivity and the insulating property of the carbon nanotubes are remarkably improved; through the synergistic effect of all the components, the thermal performance, the electrical performance and the mechanical performance of the composite material are comprehensively optimized.

A lithium supplement and a preparation method therefor, a positive electrode sheet, and a battery. The lithium supplement comprises: a core, wherein the core comprises LiaMbOc, wherein a is 2-6, b is 0-4, c is 1-6, and M comprises at least one of Mg, Al, Si, Ca, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Ru, and Sn; and a coating layer, wherein the coating layer at least covers part of the surface of the core, and the coating layer contains at least one of a silazane compound, a siloxane compound, a sulfonic acid silane compound, and a carbodiimide compound.

The invention discloses a preparation method of high-temperature-resistant high-strength dealcoholized single-component room-temperature vulcanized silicone rubber. The high-temperature-resistant high-strength dealcoholized single-component room-temperature vulcanized silicone rubber is prepared from 30-90 parts of self-made masterbatch; 2-10 parts of a cross-linking agent; 30-60 parts of a filler; 1-10 parts of a catalyst; the self-made rubber master batch is prepared by treating 10 to 200 parts of fumed silica with 1 to 20 parts of silazane in 10 to 100 parts of dimethyl silicone oil and then adding 10 to 1000 parts of dihydroxy polydimethylsiloxane. According to the preparation method of the high-temperature-resistant high-strength dealcoholized single-component room-temperature vulcanized silicone rubber, the self-made masterbatch is used as a basic polymer, so that the rubber body can obtain very high mechanical property.

The invention relates to the technical field of cables, in particular to an environment-friendly flame-retardant antioxidant chlorinated polyvinyl chloride cable and a preparation method thereof, and the environment-friendly flame-retardant antioxidant chlorinated polyvinyl chloride cable comprises the following raw materials: chlorinated polyvinyl chloride, dioctyl terephthalate, nano aluminum hydroxide, a composite flame retardant, a calcium-zinc stabilizer, epoxidized soybean oil and nano clay. The composite flame retardant forms an organic-inorganic synergistic core-shell structure on a micro-nano scale, hexaphenoxy cyclotriphosphazene provides a phosphorus source flame-retardant function, and polyborosilazane forms a boron-silicon-nitrogen ceramic network after heat treatment, so that the carbon layer stability and thermal oxidation resistance of the material are effectively improved; meanwhile, the modified silicon dioxide is used as an inorganic skeleton reinforcing phase, so that the dispersity and the interface bonding performance of the flame retardant in a CPVC matrix are improved; through the synergistic effect, the flame retardant efficiency, thermal stability and mechanical strength of the cable material are remarkably improved, and smoke release and toxicity are reduced.

The invention relates to the technical field of coatings, and discloses a high-emissivity energy-saving coating and a preparation method thereof. The preparation method comprises the following steps: reacting sulfydryl silicon carbide containing a POSS structure with 4-hydroxyphenylacrylate to generate phenolic silicon carbide, and introducing the phenolic silicon carbide into preparation of boron-containing phenolic resin to obtain a silicon carbide / phenolic resin composite material; uniformly mixing the silicon carbide / phenolic resin composite material, nickel-doped lanthanum aluminate-based ceramic powder, aluminum oxide, silicon dioxide, polyborosilazane, an adhesive, glass powder and a solvent to obtain the high-emissivity energy-saving coating. The coating is good in mechanical property, good in thermal shock resistance effect and high in high-temperature emissivity after being coated and cured on a matrix, the heat energy utilization rate of the matrix can be effectively increased, and the effects of saving energy and reducing consumption are achieved.

The invention discloses polysilazane containing a perfluorinated branched short chain and a preparation method of the polysilazane. The method comprises the following steps: (1) under the protection of inert gas, adding chlorosilane and a perfluorinated branched short-chain compound into a solvent for reaction to obtain a fluorine-containing chlorosilane monomer; and (2) adding a fluorine-containing chlorosilane monomer and a chlorosilane monomer into a solvent, and carrying out ammonolysis reaction under the protection of inert gas to prepare the fluorine-containing polysilazane. According to the invention, a perfluorinated branched short chain is introduced into polysilazane, so that the polysilazane is endowed with the characteristic of low surface energy, and meanwhile, the problems of toxicity and biological accumulation caused by a long-chain perfluorinated chain segment are avoided.

The invention provides ablation-resistant tantalum ethoxide modified polyborosilazane resin as well as a preparation method and application of the ablation-resistant tantalum ethoxide modified polyborosilazane resin. The preparation method comprises the following steps: S1, reacting boron trichloride, methyl dichlorosilane and hexamethyldisilazane under the protection of an inert atmosphere to obtain a polyborosilazane fluid; s2, under the protection of inert atmosphere, reacting the polyborosilazane fluid, divinyl benzene and tantalum ethoxide in the presence of a catalyst to obtain a tantalum ethoxide modified polyborosilazane oligomer fluid; s3, under the protection of inert atmosphere, heating and curing the tantalum ethoxide modified polyborosilazane oligomer fluid to obtain the ablation-resistant resin. The tantalum ethoxide modified polyborosilazane resin disclosed by the invention has a high crosslinking degree and shows excellent high temperature resistance and oxidation resistance.

The invention discloses a new energy battery cell temperature-resistant insulating coating which is prepared from a component A, a component B and a component C. The component A is prepared from, by weight, 20-60 parts of film forming matter, 15-50 parts of temperature-resistant filler, 15-25 parts of flame retardant, 10-15 parts of carrier powder, 1-2 parts of organic silicon additive and 3-5 parts of diluent, the component B is a catalyst, and the component C is a curing agent. The composition of the methyl polysiloxane resin, the epoxy modified polysiloxane resin and the silazane resin is used as a film forming substance, and the battery cell coating with high flame retardant grade and shear resistance can be obtained. The low-melting-point glass powder with the initial melting temperature of 500 DEG C is introduced into a film forming substance, so that the voltage resistance of the coating before high temperature resistance can be improved, the insulation effect of the coating is optimized, and the salt mist resistance, acid and alkali resistance, electrolyte resistance and water resistance are improved.

The invention discloses fluorine-containing modified organic polysilazane as well as a preparation method and application thereof. Organic polysilazane and a fluorine-containing alcohol monomer are subjected to alcoholysis reaction to prepare the fluorine-containing modified organic polysilazane. Fluorine-containing modified organic polysilazane and the surface of a base material are combined together through chemical bonds to form a firmly combined protective film, and a fluorine-containing polysilazane coating formed by hydrolysis in air has the effects of hydrophobicity, high and low temperature resistance, scratch resistance, rain prevention, fog prevention and self-cleaning.

The invention discloses self-adhesive single-component liquid silicone rubber with low compression set and a preparation method thereof. The preparation method comprises the following steps: kneading high-viscosity double-end vinyl polydimethylsiloxane, white carbon black, hexamethyldisilazane and water to prepare base rubber; and uniformly mixing and stirring the base rubber with double-end vinyl polydimethylsiloxane, polydimethylmethylvinylsiloxane, polydimethylmethylhydrosiloxane, a first functional aid, a second functional aid, an inhibitor and a catalyst in proportion to prepare the single-component liquid silicone rubber. The silicone rubber has excellent bonding performance on various substrates such as stainless steel, aluminum materials, copper materials, kovar alloys, nylon, polycarbonate and PBT (polybutylene terephthalate), has excellent mechanical properties and low compression set rate, is suitable for sealing and bonding of various automobile, industrial and electronic components, and has wide application prospects. The present invention relates to a sealing strip, in particular to a sealing adhesive scenario for in-situ curing sealing gasket (CIPG) applications, instead of a conventional sealing strip.

The invention discloses a modified organic perovskite nanocrystal and a preparation method thereof, belongs to the technical field of perovskite, and overcomes the defect that the organic perovskite nanocrystal is difficult to keep stable in the hydrolysis coating process in the prior art. The preparation method of the modified organic perovskite nanocrystal provided by the invention comprises the following steps: step 1, preparing an organic perovskite nanocrystal dispersion liquid, the organic perovskite nanocrystal being APbX3, A being MA < + > or FA < + >; x is at least one of Cl <->, Br <-> and I <->; step 2, adding a silazane coupling agent into the organic perovskite nanocrystal dispersion liquid, and reacting to prepare modified organic perovskite nanocrystals; the general formula of the silazane coupling agent is N (Si (OR) 3) 3, wherein R is alkyl. According to the invention, the silazane coupling agent is adopted, the generated ammonia gas can protect the organic perovskite nanocrystal, and the surface of the organic perovskite nanocrystal is uniformly coated with a layer of silicon dioxide on the premise of maintaining the stability of the organic perovskite nanocrystal.

The invention discloses a corrosion-resistant metal surface composite coating material and a preparation method thereof in the technical field of metal plating, a first deposition layer and a second deposition layer are formed on a stainless steel metal surface through multi-layer doping type electro-deposition treatment, the first deposition layer can improve the adhesiveness of a metal coating and the stainless steel surface, and the second deposition layer can improve the adhesiveness of the metal coating and the stainless steel surface. The uniformity of the second deposition layer can be improved; the second deposition layer is composed of various metal ions and polytitanium silazane, and the corrosion resistance of the metal coating can be improved.