145 results about "Polysilazane" patented technology

The invention discloses a water-based poly-ceramic coating material as well as a preparation method and application thereof. The formula comprises a composite base material (40-45 parts of modified waterborne polyurethane resin and 15-20 parts of a waterborne acrylic emulsion), a synergistic curing system (10-12 parts of a blocked isocyanate curing agent and 0.8-1.2 parts of a latent organic zinc salt accelerant), an organic-inorganic reinforced phase (10-15 parts of nano silicon dioxide and 8-10 parts of polysilazane) and a functional aid. The base material and the cosolvent cooperate to make VOCs less than or equal to 30 g / L, a curing system cooperates to realize low-temperature rapid curing, organic-inorganic components cooperate to form a poly-ceramic structure, the coating is adaptive to an existing roll aluminum production line, and the problems of environmental protection, energy conservation and performance of a traditional coating are solved.

The invention belongs to the technical field of special ceramic preparation, and particularly relates to high-strength special ceramic and a preparation method thereof. The high-strength special ceramic is prepared from the following raw materials: alumina powder, quartz powder, serpentine, phosphorus slag, eucryptite, barium borate, nano yttrium trifluoride, nano hafnium boride, nano strontium zirconate, nano lanthanum titanate and polyborosilazane. According to the high-strength special ceramic disclosed by the invention, the aluminum oxide powder, the quartz powder, the serpentine and the phosphorus slag are taken as matrix raw materials, eucryptite, barium borate and yttrium trifluoride are taken as fluxing agents, and nano hafnium boride, nano strontium zirconate, nano lanthanum titanate and polyborosilazane are taken as fillers, so that the prepared special ceramic has excellent bending strength and fracture toughness.

The invention provides an insulating high-thermal-conductivity flexible silica gel sheet and a preparation method thereof. The silica gel sheet comprises the following components in parts by weight: 1-5 parts of organic boride; 1 to 5 parts of a polysilazane compound; 1-5 parts of hydrogen-containing silicone oil; 5 to 10 parts of dimethyl silicone oil; 20 to 30 parts of vinyl silicone oil; 50-80 parts of a heat-conducting filler; 0.01 to 0.1 part of a platinum catalyst; the heat-conducting filler comprises a heat-conducting filler 1 and a heat-conducting filler 2, the heat-conducting filler 1 is selected from any one of boron nitride, aluminum oxide and magnesium oxide, and the heat-conducting filler 2 is selected from any one of graphene, silicon carbide and silicon nitride. The flexible silica gel sheet provided by the invention realizes comprehensive optimization of high heat-conducting property, excellent electrical insulating property, thermal mechanical stability and surface flatness.

The invention discloses a weather-resistant pearlescent pigment and a preparation method thereof. The weather-resistant pearlescent pigment comprises a pearlescent pigment of which the outer surface is coated with a protective layer, the main component of the protective layer is silicon dioxide, and the protective layer is combined with the pigment substrate in a covalent bond form; and the protective layer is formed by curing polysilazane. The invention also discloses a color coating composition containing the weather-resistant pearlescent pigment, a cured coating, and a glass panel and a photovoltaic module containing the cured coating. According to the weather-resistant pearlescent pigment, a high-hardness silicon dioxide protection layer is formed on the surface of a common pearlescent pigment, and the weather resistance of the pearlescent pigment is remarkably improved.

The application belongs to the technical field of inorganic porcelain composite materials, and particularly relates to an inorganic porcelain composite material for resisting salt and nitrate and preventing moisture and a preparation method thereof. The application comprises the following steps: preparation of activated base powder; and sintering of the activated base powder. The application is prepared by sintering a blank body made of calcium carbonate, talcum powder, silicon nitride, quartz sand and perhydrogen polysilazane. The perhydrogen polysilazane is first decomposed to solidify and shrink the blank body. When the temperature continues to rise, the quartz in the blank body and the silicon dioxide generated by the oxidation of the silicon nitride are both in a molten state and are fused with each other. The oxygen in the air penetrates into the blank body by diffusion and reacts with the silicon nitride. At this time, the nitrogen gas generated by the silicon nitride cannot diffuse outward under the molten blank body formed after solidification and shrinkage, and gradually gathers to cause the expansion of the base and a high closed porosity. The prepared inorganic porcelain composite material has excellent moisture resistance and high resistance to salt and nitrate.

The invention relates to the field of nuclear cable manufacturing, in particular to a radiation-resistant cable for a nuclear power platform and a preparation method of the radiation-resistant cable. According to the nuclear cable, the five-layer structural design of conductor-insulation-shielding-polyimide film-sheath is adopted, the overlapping wrapping technology of the polyimide film is combined, and the comprehensive performance of the cable in the extreme environment of a nuclear power platform is comprehensively improved. The low-smoke halogen-free flame-retardant ethylene-propylene rubber is adopted as an insulating material, and through the cooperation of an EPDM / POE blending system and the ternary composite flame retardant, the insulating property is stable under the condition of ensuring radiation, and the flame retardant property is excellent. The sheath material is added with the intumescent flame retardant and the polysilazane modifier, so that the cable has no crack at the low temperature of-40 DEG C, the bending radius can be controlled to be less than 5 times of the outer diameter, and the cable is adaptive to the layout of a narrow cabin. Through the synergistic effect of material innovation and structural design, the balance of flame retardant property, mechanical property, radiation resistance, low temperature resistance, aging resistance and small-space applicability of the nuclear cable is realized.

The invention discloses bi-component high-thermal-conductivity ceramizable liquid silicone rubber. The liquid silicone rubber is prepared from a component A and a component B in a mass ratio of 1: 1, the component A is prepared from the following raw materials in parts by weight: 100 parts of a base material, 5 to 15 parts of a hydrogen-containing silicone oil cross-linking agent, 0.5 to 3 parts of a chain extender, 10 to 20 parts of vinyl modified polysilazane and 0.01 to 0.1 part of an inhibitor; the component B is prepared from the following raw materials in parts by weight: 100 parts of a base material, 10 to 20 parts of vinyl modified polysilazane and 0.5 to 3 parts of a catalyst. The bi-component high-thermal-conductivity ceramizable liquid silicone rubber disclosed by the invention has excellent fluidity, is easy to form, has a high thermal conductivity coefficient (up to 7w / m.k or above), can be encapsulated into extremely small gaps among electronic components, and avoids the situation that heat cannot be dissipated in time due to the existence of the gaps; the reaction is mild, room-temperature curing and high-temperature accelerated curing can be realized, and a silica gel layer cured under a high-temperature condition can form a compact ceramic layer and can bear 1500 DEG C high-temperature long-time baking without cracking and deformation.

This invention discloses a room-temperature curing self-cleaning photocatalytic film based on multi-level interface synergistic enhancement and its preparation method. The method includes: (1) preparing monodisperse TiO2 nanocrystals with controllable lattice strain using a non-equilibrium growth method; (2) constructing a TiO2 / UiO-66-NH2 / rGO ternary Z-type heterojunction photocatalytic material; (3) preparing a two-component room-temperature curing all-inorganic binder system composed of acid-catalyzed silica sol (ACSS) and fluorosilane-modified polysilazane; (4) compounding the heterojunction photocatalytic material with the binder system and adding nano-silica dispersion, and forming a coating liquid by ultrasonic-shear synergistic dispersion; (5) depositing it on a glass substrate using a gradient ultrasonic spraying process, and curing it into a film by room temperature-medium temperature stepwise curing. This invention achieves, for the first time, a fully inorganic self-cleaning film with both ultra-high photocatalytic activity and ultra-long weather resistance under room temperature curing conditions through multi-level interface synergy of ternary heterojunction synergistic photocatalytic enhancement, room temperature curing of two-component inorganic binder, and gradient film-forming structure design. It solves the technical problem of the difficulty in unifying photocatalytic activity, film-forming process, optical performance and service life in the prior art.

The invention relates to the technical field of high polymer materials, in particular to a wear-resistant and high-temperature-resistant nylon material and a preparation method thereof. The composite material is prepared from the following raw materials in parts by weight: 20-50 parts of a nylon new material, 50-80 parts of a nylon recycled material, 15-25 parts of wear-resistant and high-temperature-resistant filler, 5-12 parts of a compatilizer and 3-5 parts of a processing aid, the wear-resistant and high-temperature-resistant filler is an inorganic filler containing a film coating layer; the inorganic filler is a mixture of at least two of sepiolite fiber, wollastonite powder and fumed silica; the film coating layer is prepared from aminopropyl heptaisobutyl cage-shaped polysilsesquioxane, methyl vinyl hybrid aryne resin and methyl hydrogen-containing polysilazane. The prepared product can keep stable performance in a long-term high-temperature environment, the abrasion resistance of the material is improved through the effects of hardness improvement, density optimization, interface strengthening and the like, abrasion is effectively reduced under the severe conditions of long-term high temperature, oil containing and the like, and the service life of the material is prolonged.

This invention discloses a modified polysilazane, a two-component silicone sealant, and a method for preparing the same. The modified polysilazane is prepared through a nucleophilic substitution reaction of dimethyldichlorosilane, vinyltrichlorosilane, and ethylenediamine. The two-component silicone sealant prepared using the modified polysilazane of this invention significantly improves its hardness under sealed conditions without adversely affecting its curing and performance. Furthermore, it requires a small amount and is highly practical. The two-component silicone sealant prepared using the modified polysilazane of this invention exhibits high hardness retention under sealed conditions, significantly slows down the reversion phenomenon, and maintains good mechanical properties and adhesion even after curing at 90°C under sealed conditions. It also demonstrates excellent resistance to reversion under fully sealed conditions.

The invention discloses a polysilazane nano composite coating and a method for treating the surface of a mold. The polysilazane nano composite coating comprises the following components: polysilazane resin, nano aluminum oxide, nano silicon oxide, nano boron nitride, a dispersing agent, a flatting agent, a defoaming agent and a solvent. The method comprises the following steps: spraying a polysilazane nano composite coating on the surface of a mold; the mold is placed at the temperature of 140-160 DEG C to be baked for 15-20 min, and then the mold is heated to 240-260 DEG C to be baked for 30-60 min. The problems of pollution, high cost, poor coverage, easiness in stripping and the like existing in an existing mold surface treatment technology are solved.

A method is provided for producing a modified polysilazane-cured coating that densifies a coating made of a polysilazane compound in a short period of time. This method provides a coating having a sufficiently low water vapor transmission rate in a short period of time. Additionally, this method provides a modified polysilazane-cured coating. To cure the coating containing polysilazane, it is irradiated with vacuum ultraviolet (VUV) light at an intensity within a specific range. The method includes a step of applying a base material containing the polysilazane compound represented by formula (1) to form a coating and irradiating the coating with Xe excimer light to modify the polysilazane compound and form a cured coating of the modified polysilazane compound. The illuminance of the Xe excimer light in the curing step is set to a range of 280 to 450 mW / cm2.

The invention relates to the field of aluminum-nickel-cobalt magnet preparation, in particular to an aluminum-nickel-cobalt magnet and a preparation method thereof. Comprising the following steps of melt-spinning, hydrogen demolishing and grinding, compression molding, sintering processing and phosphating treatment, wherein corrosion-resistant components comprise methyl vinyl silazane and polysilazane resin; the phosphating solution comprises the following components in concentration: 30-100 g / L of monopotassium phosphate, 100-200 g / L of phosphoric acid and 5-10 g / L of manganous nitrate; the temperature range of the high-temperature phosphating treatment is 85-98 DEG C. The silicon nitride ceramic is generated by sintering the corrosion-resistant components, so that the corrosion resistance of the aluminum-nickel-cobalt magnet added with Tb and Dy is improved; meanwhile, the sintered aluminum-nickel-cobalt magnet is subjected to phosphating treatment, a phosphating film with high adhesive force is generated through potassium ions in a phosphating solution and silicon nitride ceramic at a high temperature, the corrosion resistance of the aluminum-nickel-cobalt magnet is further improved, and therefore the aluminum-nickel-cobalt magnet is prepared.

The invention relates to the technical field of liquid silicone rubber, and particularly discloses a wear-resistant liquid silicone rubber composite material and a preparation method thereof. The composite material comprises a component A and a component B, wherein the component A comprises vinyl-terminated silicone oil, nano aluminum oxide double-modified by a polyhydroxy polymer and a vinyl silane coupling agent, and a platinum catalyst; the component B comprises vinyl-terminated silicone oil, hydrogen-containing silicone oil, an inhibitor and active polysilazane, the active polysilazane is modified polysilazane containing vinyl or epoxy group, and the active group of the active polysilazane can chemically react with the active group on the surface of the modified nano aluminum oxide to form a chemically bonded interface transition layer. According to the invention, through a dual modification strategy and introduction of active polysilazane, a chemically bonded rigid-flexible bicontinuous network structure is constructed, so that the wear resistance of the composite material is improved while excellent tensile strength, tear strength and elongation at break are maintained.

The application discloses a preparation method of a high-strength ceramic diamond grinding head containing polysilazane, and relates to the technical field of abrasive tool manufacturing. The method aims to solve the problems of poor self-sharpening, insufficient heat resistance, weak bonding force, high sintering energy consumption and easy damage to workpieces of traditional metal, resin and conventional ceramic binder diamond grinding heads. The method comprises the following steps: removing impurities from diamond, adding silicon carbide and oxides according to a specific ratio to prepare a precursor, adding a certain mass fraction of modified polysilazane and a dispersing agent, and finally obtaining the grinding head through gradient heating and sectional sintering in a nitrogen atmosphere after pressure forming. The gradient sintering and inert protection can avoid graphitization of the diamond and defects of the blank. The grinding head prepared by the method has high compressive strength, a dense and gap-free bonding interface, excellent Vickers hardness and abrasive holding force.

The application discloses spherical silicon nitride powder and a preparation method and application thereof, and belongs to the field of nitride ceramic materials. The spherical silicon nitride powder has a beta phase silicon nitride content of greater than or equal to 95%, an average sphericity of greater than or equal to 0.80, a tap density in a range of 1.9-2.2 g / cm 3 , and a particle size in a range of 10-170 mu m. The preparation method comprises the following steps: in an organic solvent, taking beta-Si3N4 as an aggregate, taking silicon nitride precursors as an activator, taking a beta-diketone rare earth complex as a sintering aid, taking a mixture of polysilazane and PVB as a binder, and after pretreatment, high-temperature calcination is carried out under a nitrogen atmosphere to obtain the spherical silicon nitride powder. The prepared spherical silicon nitride powder can be used as a raw material for preparing an insulating heat-conducting material. The application can realize the preparation of high-density and high-thermal-conductivity spherical silicon nitride powder, and the prepared insulating heat-conducting material has high thermal conductivity.

The invention discloses a high-performance silicon carbide coating embedding process, and relates to the technical field of static pressure graphite coating materials. The preparation method comprises the following steps: firstly, weighing SiC powder, Si powder and carbon powder according to a specific mass ratio, and carrying out ball milling and mixing to prepare embedding powder; the preparation method comprises the following steps: embedding a graphite matrix into embedding powder, and carrying out argon protection and temperature programming sintering to prepare a SiC coating modified graphite matrix; then preparing dendritic polysilazane steeping liquor containing azobenzene groups, putting the modified matrix into a vacuum steeping tank, carrying out ultraviolet irradiation assisted vacuum steeping and gradient drying, and then carrying out temperature programming curing, so as to obtain the composite coating modified graphite material. According to the process, the problems that a traditional embedding method has many coating defects and the mechanical property of a matrix is reduced are solved, through deep penetration repairing of photosensitive dendritic polysilazane, the coating density and the interface bonding strength are improved, and the obtained material has excellent mechanical and thermal properties and structural stability and meets the requirement of high-end working conditions.

The invention discloses an aluminum nitride ceramic substrate and a preparation method thereof, and belongs to the technical field of ceramic substrates, and the preparation method comprises the following steps: 1, mixing aluminum nitride powder, a sintering aid, a boron nitride dispersion liquid, a dispersant, a binder, a plasticizer and a solvent in parts by weight, and carrying out ball milling to obtain slurry; the boron nitride dispersion liquid comprises hydroxylated boron nitride nanosheets and hyperbranched polysilazane, the mass ratio of the hyperbranched polysilazane to the boron nitride is (0.8-1): 1, and the addition amount of the modified boron nitride is 0.8%-1.2% of the mass of the aluminum nitride powder; 2, carrying out tape casting and cold isostatic pressing on the slurry to obtain a blank; and the blank is subjected to glue discharging and sintering, and the aluminum nitride ceramic substrate is obtained. According to the preparation method, the boron nitride dispersion liquid composed of the hydroxylated boron nitride nanosheets and the hyperbranched polysilazane is added, and synchronous optimization of the tensile property and the heat-conducting property of the aluminum nitride ceramic substrate is achieved through the synergistic effect between the hydroxylated boron nitride nanosheets and the hyperbranched polysilazane.

The application belongs to the technical field of dental ceramic materials, and particularly relates to a composite material suitable for DLP 3D printing technology for dental repair and a preparation method thereof. The composite material for dental repair comprises the following raw materials in parts by weight: polysilazane ceramic precursor binder: 30-50 parts; zirconium oxide: 60-90 parts; photoinitiator: 3-7 parts; thermal initiator: 2-5 parts; dispersing agent: 2-6 parts; rheological agent: 1-5 parts; silane coupling agent: 3-8 parts; sintering aid: 5-10 parts; the polysilazane precursor material is used to realize precise forming through photocuring, and then the inorganic ceramic can be controllably converted through heat treatment, the composite material has the processability of organic substances and the high temperature resistance and high stability of ceramics, the problem of easy decomposition, large shrinkage and insufficient strength of traditional organic binders at high temperatures is overcome, and a new material basis is provided for high-performance ceramic device preparation.

The present application relates to the field of environment-friendly metal surface pretreatment technology, and discloses a metal chelating film forming agent, a preparation method and application thereof, wherein low-molecular polysilazane resin and zirconium triethanolamine compound are used as film forming agents, epoxy modified silicone resin is used as an auxiliary film forming agent, aspartic acid diacetic acid tetrasodium is used as a chelating dispersant, tetramethyl decyne glycol is used as a wetting agent, n-butanol is used as a leveling agent, and interface stable graphene with Schiff base functional groups, quinoline functional groups and quaternary ammonium salt functional groups on the surface is used as a corrosion-resistant filler to prepare the metal chelating film forming agent, wherein the present application is environmentally friendly, and after the leak detection process of the compressor muffler, no alkaline cleaning agent is needed for cleaning and treatment, and the subsequent spraying can be directly performed, on the other hand, the metal substrate surface can be combined by physical adsorption and chemical adsorption to produce strong bonding force, and a dense protective film is formed on the metal substrate surface, thereby achieving the beneficial technical effect of significantly improving the corrosion resistance.

The invention relates to a method for selectively passivating a surface of a substrate, wherein the surface of the substrate comprises at least one first surface comprising a dielectric and at least one second surface comprising another material. The method comprises the step of exposing the first and second surfaces to at least one organoaminopolysiloxane or organoaminopolysilazane, wherein the organoaminopolysiloxane or organoaminopolysilazane selectively reacts with the dielectric to passivate the first surface while leaving the second surface substantially unreacted.

The invention relates to a fluoride-free anti-fingerprint layer as well as a preparation method and application thereof. The fluoride-free anti-fingerprint layer comprises a micro-nano composite structure on a base material and a polysilazane coating arranged on the micro-nano composite structure, the micro-nano composite structure comprises a micron array distributed on the surface of the base material and hydrophobic hybrid silicon dioxide nanospheres distributed on the micron array. The fluoride-free anti-fingerprint layer provided by the invention has the characteristics of good antifouling and anti-fingerprint effects, good wear resistance and good durability.

This invention relates to the field of glaze technology and discloses a high-strength antibacterial ceramic glaze and its preparation method. The high-strength antibacterial ceramic glaze is composed of the following raw materials in parts by weight: 30-40 parts by weight of kaolin, 5-15 parts by weight of potassium feldspar, 5-15 parts by weight of sodium feldspar, 6-10 parts by weight of talc, 3-8 parts by weight of corundum, 5-10 parts by weight of cordierite, 5-10 parts by weight of dolomite, 2-5 parts by weight of modified cerium-based MOF, and 2-5 parts by weight of modified organopolysilazane. This application achieves the purpose of dispersing the glaze by using modified organopolysilazane, and at the same time utilizes the Si-O-N ceramic formed during sintering to improve the strength of the glaze. By preparing a modified cerium-based MOF, the long-term antibacterial performance of the glaze is improved. The glaze prepared by this application has excellent strength and long-term antibacterial performance.

The application belongs to the field of heterogeneous catalysis and material synthesis, and discloses a lotus-shaped ceramic fiber iron-ruthenium-based catalyst for synthesizing biofuel as well as a preparation method and application thereof. The catalyst is prepared by using a coaxial electrospinning process, taking polysilazane, an iron source and a spinning aid as a shell spinning solution, and taking a mixture containing polysilazane, an iron source, a ruthenium source, a pore-forming agent and a spinning aid as a core spinning solution, to obtain a lotus-shaped ceramic fiber precursor containing iron-ruthenium. After the precursor is subjected to stepwise heating and solidification, inert atmosphere pyrolysis and hydrogen reduction, the lotus-shaped ceramic fiber iron-ruthenium-based catalyst is formed. The catalyst has excellent mechanical strength, high hydrothermal stability and good reaction mass transfer performance, and is suitable for preparing biofuel from syngas in a fixed bed reactor.

The present invention provides a method for coating a substrate comprising applying to the substrate: i. A solution A comprising at least a polysilazane and a solvent, ii. A solution B comprising at least a catalyst promoting crosslinking of the polysilazane and a solvent, where solution A and solution B are applied substantially separately onto the substrate and then mixed.

The present invention relates to a polysilazane composition, in particular a composition, the use of the composition for coating a substrate, and a substrate comprising a coating made from the composition.

The invention belongs to the technical field of ceramic materials, and particularly discloses a silicon nitride ceramic preparation method based on polysilazane coated modified silicon nitride powder, the method comprises the following steps: step S1, preparing polysilazane coated modified silicon nitride powder; s2, preparing photocuring ceramic slurry for printing; s3, green body printing is carried out; and S4, degreasing and sintering to prepare the silicon nitride ceramic based on the polysilazane coated modified silicon nitride powder. According to the preparation method of the silicon nitride ceramic based on the polysilazane coated modified silicon nitride powder, the surface of the silicon nitride powder is modified, and preparation of silicon nitride slurry with high curing performance and high-toughness silicon nitride ceramic can be realized based on a photocuring additive manufacturing technology.

The application provides a high-boron-content polymer and a preparation method and application thereof, and relates to the technical field of high polymer materials. The preparation method of the high-boron-content polymer comprises the following steps: dissolving polysilazane in an organic solvent under the protection of nitrogen or argon to obtain a polysilazane mixed solution; and adding ammonia borane to the polysilazane mixed solution under the condition of a temperature of-10 DEG C to 0 DEG C, and stirring and reacting to obtain the high-boron-content polymer. Under the condition of a temperature of-10 DEG C to 0 DEG C, the borohydride reaction between ammonia borane and polysilazane is assisted by low-temperature liquid phase, the high-boron-content polymer is prepared, ammonia borane is used as a boron source, the synthesis difficulty is reduced, and the synthesis efficiency is increased; the boron content of ammonia borane is high, and ammonia borane is non-toxic and safe; meanwhile, the synthesis can be completed under the condition of low temperature, the reaction is easier and safer, the synthesis efficiency of the synthesized polymer is improved, and the high-boron-content polymer can be generated in a large quantity.