181 results about "Silazane" patented technology

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 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 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 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 high-temperature-resistant and high-modulus adhesive and a preparation method thereof, and relates to the technical field of adhesives. The water-based adhesive comprises the following raw materials: 40-60 parts of a soft monomer, 20-30 parts of a hard monomer, 5-10 parts of a functional monomer, 1-3 parts of a cross-linking agent, 0.5-1.5 parts of an initiator, 2-5 parts of a modified nano filler and 30-50 parts of a solvent, the functional monomer is prepared by compounding N-methoxy methyl acrylamide, acrylic acid and 2-acrylic acid-hexahydro-4, 7-methylene-1H-indenyl ester according to a mass ratio of 2 to 1 to (1 to 1.5); the cross-linking agent is prepared by compounding N, N '-methylene bisacrylamide and 1, 1, 3, 3-tetramethyl-1, 3-divinyl disilazane according to a mass ratio of 1: (0.5 to 1). The adhesive has the advantages of favorable adhesive property, favorable high-temperature resistance and high modulus.

The application belongs to the technical field of carbon / ceramic composite material preparation, and provides an impregnation sealing liquid for carbon / ceramic friction discs, an impregnation sealing method, a densified carbon / ceramic friction disc and application thereof. The impregnation sealing liquid comprises 2-5% of an interface reinforcing metal component, 3-6% of a friction and wear resistant ceramic component, 2-5% of a metal oxide component and the balance of a polymer. The polymer comprises liquid polycarbosilane and liquid polyborosilazane, and the mass ratio of the liquid polycarbosilane to the liquid polyborosilazane is 7-9:1-3. The interface reinforcing metal component comprises one or more of titanium powder, chromium powder, nickel powder, cobalt powder and molybdenum powder. The friction and wear resistant ceramic component comprises one or more of silicon carbide, zirconium boride, boron carbide and zirconium carbide. The metal oxide component comprises one or more of cerium oxide, yttrium oxide and lanthanum oxide. The impregnation sealing liquid can realize the triple improvement of the interface bonding force, the friction stability and the high-temperature oxidation resistance of the carbon / ceramic friction disc.

A process for producing a hybrid polymer material based on a reactive polymer resin and one or more Si compounds from the group comprising silanes, siloxanes, silazanes and silicone resins, wherein an inorganic solid and one or more other solids selected from the group comprising thermoplastics, thermosets, elastomers, recycled plastics, aramid fibers, carbon fibers, natural fibers and plant solids are first combined with the reactive polymer resin and the one or more Si compounds as well as additives to form a raw material, the raw material is compacted and subsequently reacted and cured, wherein the one or more other solids are used in a proportion of 30 wt.% to 75 wt.% of the raw material.

This application relates to the field of hydrosilylation, and in particular to a highly efficient catalyst for hydrosilylation reactions and its preparation method. This application provides a method for preparing a microcapsule-form catalyst, which first modifies methyl-terminated hydroxyl silicone oil with silazane, and then forms a microcapsule coating system with paraffin, thereby improving the release performance of the microcapsule coating system, so that the catalyst has low reactivity in the early stage of release, thereby improving the uniformity of the reaction process inside the silicone rubber, and thus improving the transparency and overall strength of the silicone rubber.

The application belongs to the technical field of sand consolidation agent preparation, and particularly relates to a sand consolidation agent and a preparation method thereof. The sand consolidation agent is composed of component A and component B. The component A is composed of the following raw materials: a diphenyl phenolic epoxy resin, hexakis(4-hydroxymethylphenoxy)cyclotriphosphazene, modified nano calcium zirconate, cage octakis(aminophenyl)silsesquioxane, n-butyl glycidyl ether, KH-550 silane coupling agent, polyether amine, fumed silica and defoaming agent. The component B is composed of the following raw materials: polyborosilazane and 2-ethyl-4-methyl imidazole. The cage octakis(aminophenyl)silsesquioxane in the raw material of the sand consolidation agent strengthens the network structure stability through chemical bonding, the hexakis(4-hydroxymethylphenoxy)cyclotriphosphazene realizes thermal stabilization through chemical bonding and physical dispersion, and the modified nano calcium zirconate provides physical support. The three components synergistically improve the heat resistance of the system.

The invention discloses high-temperature-resistant peroxide vulcanized rubber and a preparation method thereof, and belongs to the technical field of vulcanized rubber, and the high-temperature-resistant peroxide vulcanized rubber is prepared from the following raw materials in parts by weight: 90.0 to 100.0 parts of methyl vinyl silicone rubber, 1.0 to 3.0 parts of silane coupling agent modified graphene oxide, 35.0 to 45.0 parts of white carbon black, 1.0 to 3.0 parts of nano iron oxide, 1.0 to 2.0 parts of nano cerium oxide and 1.0 to 2.0 parts of silazane oligomer. The invention discloses a silicone rubber composition which comprises the following components in parts by weight: 5.0-5.0 parts of methyl vinyl silicone rubber, 3.0-5.0 parts of carboxyl silicone oil and 0.8-1.5 parts of 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane, the vinyl content of the methyl vinyl silicone rubber is 0.5-1.0%, and the silazane oligomer is hexamethyldisilazane. Through the mode, the silicone rubber is subjected to peroxide vulcanization, so that the heat resistance of the silicone rubber with high thermal stability is further improved, and meanwhile, the overall performance of vulcanized rubber is jointly improved through the compounding of the graphene oxide modified by the silane coupling agent and the white carbon black and the synergistic gain effect of pre-irradiation treatment in the preparation process.

The application belongs to the technical field of nanofiltration, and provides a preparation method of recrystallized silicon carbide-silicon carbon nitride ceramic membrane. The application obtains a pyrolytic material by first applying a polysilazane solution on a porous base and then performing first pyrolysis; and obtains the recrystallized silicon carbide-silicon carbon nitride ceramic membrane by second applying the polysilazane solution on the pyrolytic material and then performing second pyrolysis. The application uses a solution containing propargyl polysilazane or an organic polysilazane Durazane 1500 rapid cure fast-drying resin as a precursor to prepare the ceramic membrane, and the ceramic membrane has high ceramic yield, excellent high-temperature stability, high rejection rate and controllable microstructure, and is suitable for separation and protection applications in extreme environments.

The present disclosure provides a one-component room temperature vulcanizable (RTV) silicone sealant composition comprising an alkoxy-terminated organopolysiloxane polymer (a) and a tin-based catalyst (d), and a process for preparing said one-component room temperature vulcanizable (RTV) silicone sealant composition comprising an alkoxy-terminated organopolysiloxane polymer (a) and a tin-based catalyst (d). The one-component room temperature vulcanizable (RTV) silicone sealant composition relies on a novel stabilizer combination (e) of (e)(i) one or more silazanes and one or more silanes (e)(ii) having at least one acetamide group, with the aim of providing a storage-stable one-component room temperature vulcanizable (RTV) silicone sealant composition.

The invention provides a preparation method of 1-chloromethyl silazane, and relates to the technical field of chemical synthesis. The method specifically comprises the following steps: (1) adding a first catalyst and chloromethyl trichlorosilane into a mixed material containing an auxiliary solvent and a reactive solvent, and reacting to obtain a first material; the reactive solvent is a C1-C6 alcohol solvent; (2) distilling to remove hydrogen chloride in the first material to obtain a second material; (3) adding a catalyst alkali and a surfactant into the second material, and then adding triethanolamine for reaction; and precipitating the reacted material through an anti-solvent to obtain the high-purity 1-chloromethyl silatrane. The 1-chloromethyl silazane can be prepared by a one-pot method, and the second-stage reaction is directly carried out without separation and purification after the first-stage reaction is completed, so that the intermediate loss is reduced, and the yield of the target product is increased. According to the whole preparation method, the technological process is greatly simplified, operability is high, industrial production is easy, and important economic value is achieved.

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.

The present application relates to a kind of based on water-based resin composite modification super-hydrophobic coating and its preparation method and application, belong to coating technical field.Super-hydrophobic coating, including the following weight parts of raw materials: methyl acrylate 10~15 parts;Acrylic acid 0.1~0.2 parts;Hexamethyl silazane 2~4 parts;Tetraethoxysilane 1~3 parts;Emulsifier 0.3~0.6 parts;Polymerization initiator 0.1~0.2 parts;Water 80~100 parts;Hexadecyl trimethoxysilane accounting for 2~5% of the total mass percentage of super-hydrophobic coating and amino-modified nanometer silicon dioxide accounting for 0.3~0.6% of the total mass percentage of super-hydrophobic coating.Used raw material is all environmental friendly substance;And can reduce surface energy, increase contact angle, the liquid with smaller surface tension can also show "lotus effect";Droplet can freely roll, no soaking occurs, can be applied to the liquid with smaller surface tension than water.

The present application belongs to the field of heterogeneous catalysis and material synthesis, and relates to a hollow ceramic fibrous iron-based catalyst for preparing biofuel from synthesis gas, a preparation method and application thereof. The catalyst is prepared by a coaxial electrospinning process, with polyborosilazane as a shell layer, polymethyl methacrylate, polyvinylpyrrolidone and acetylacetone iron as a core layer, and through spinning, solidification, gradient temperature pyrolysis and reduction steps, a hollow ceramic fibrous iron-based catalyst is prepared. The shell layer of the catalyst is converted into a high-strength and high-temperature stable SiBCN ceramic carrier, the core layer is pyrolyzed to form a hollow cavity and in-situ load high-dispersion iron active species, and the catalyst has good mechanical strength, high hydrothermal stability and excellent catalytic activity. The application of the catalyst in a continuous flow fixed bed reactor for preparing biofuel from synthesis gas is suitable for the synthesis of sustainable aviation fuel and other biofuels.

The application discloses a functional surface modifier and a preparation method and application thereof, and belongs to the technical field of surface treatment, and comprises the following raw materials in parts by weight: dithiol 25-50 parts, tetramethyldivinyl disilazane 20-40 parts, a photoinitiator 0.2-1 part, a functional reagent 25-50 parts and an organic solvent 100 parts. The functional surface modifier prepared by the application is suitable for modifying the surfaces of materials with different requirements, and has a wide application range and prospect.

This invention discloses a high-fire-resistant concrete, characterized by being composed of the following components in parts by weight: 20-25 parts cement, 30-35 parts crushed stone, 10-25 parts river sand, 10-12 parts volcanic ash, 10-20 parts water, 1-3 parts epoxy-propionic acid modified octa-tetramethylcyclotetrasilazane, 0.3-0.6 parts guanidine carbonate, 1-3 parts calcium borate, 0.5-1 part waste polyarylene diazole fiber, and 0.1-0.3 parts 3-chloro-2-hydroxypropanesulfonic acid modified 2,5-bis(diethylamino)phenyl-1,3,4-diazole. This invention also discloses a method for preparing the aforementioned high-fire-resistant concrete. The high-fire-resistant concrete disclosed in this invention exhibits high fire resistance, good workability, excellent comprehensive performance, impermeability and crack resistance, durability, and high compressive strength.

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.

Microelectronic assemblies, related devices and methods, are disclosed herein. In some embodiments, a microelectronic assembly may include a first die having a surface; a second die having a first surface, an opposing second surface, and side surfaces between the first surface and the second surface, wherein the first surface of the second die is electrically coupled to the surface of the first die, and wherein the side surfaces of the second die are scalloped. In some embodiments, side surfaces of the second die may include a protective coating material, where the protective coating material includes an alkyl silane, a fluoroalkyl silane, a thiol, a phosphonic acid, an alkanoic acid, a siloxane, a silazane, a polyolefin, or a fluorinated polymer. In some embodiments, a microelectronic assembly may further include a dielectric material around a plurality of second dies and the dielectric material does not have an interface seam.

This application relates to the field of composite fabric technology, and more specifically, to a wear-resistant composite flocked fabric and its preparation method. It is prepared by the following method: S1: Wear-resistant flocking adhesive is uniformly applied to a substrate to form an adhesive surface; S2: Flocking piles are placed on the adhesive surface, and electrostatic treatment is used to vertically disperse the flocking piles on the adhesive surface with a thickness ≤1mm, resulting in a semi-finished product; S3: The semi-finished product is dried, cured, cooled, brushed, and rolled up to obtain the wear-resistant composite flocked fabric. The wear-resistant flocking adhesive is composed of the following raw materials by weight percentage: 40-60% hyperbranched unsaturated resin, 2-8% tetramethyldivinyldisilazane, 8.5-15% cage-type polysilsesquioxane-trinorbornene isobutyl ester, 10-20% polyethylene glycol-diacrylate, 1-3% catalyst, 0.5-1% processing aid, and solvent to 100%. The wear-resistant composite flocked fabric obtained by the above method possesses both excellent wear resistance and durability.

The application discloses a modified silane coupling agent and a preparation method thereof, an anti-yellowing dealcoholized sealant and application thereof, and a preparation method of the anti-yellowing dealcoholized sealant. The preparation method of the anti-yellowing dealcoholized sealant comprises the following steps: A100, carrying out dehydration homogenization treatment on alpha, omega-dihydroxypolydimethylsiloxane, dimethyl silicone oil and a filler under a vacuum condition to obtain a first base material; A200, blending and treating a part of a crosslinking agent and the first base material under the vacuum condition to obtain a second base material; A300, providing a modified silane coupling agent, blending and treating another part of the crosslinking agent, the modified silane coupling agent and a catalyst under the vacuum condition to obtain the anti-yellowing dealcoholized sealant. The modified silane coupling agent is prepared by blending a silazane compound with a trimethylsilyl group and a silane compound with a primary amino group and a hydrolysable silicon functional group, which is favorable for reducing the amino oxidation activity and thus improving the ultraviolet resistance, thermal oxygen aging capacity and storage stability of the anti-yellowing dealcoholized sealant.

To provide a polycarbosilazane making it possible to form a silicon-containing film having resistance to acid etching, and a composition comprising the polycarbosilazane.SOLUTION: The present invention provides a polycarbosilazane comprising repeating units of -[R1R2Si-(CH2)n]- and -(R3R4Si-NR5)- (where, R1, R2, R3 and R4 are each independently a single bond, hydrogen or C1-4 alkyl; R5 is independently a single bond or hydrogen; and n is 1-2, and a composition comprising the polycarbosilazane. The present invention also provides a method for forming a silicon-containing film, comprising coating the composition above a substrate and heating.SELECTED DRAWING: None

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.

This invention discloses a flame-retardant high-shield cable material and its preparation method, relating to the field of cable material technology. The cable material, by weight, comprises a matrix resin, silicone oil-modified aminated multi-walled carbon nanotubes, a composite flame-retardant system, a composite shielding system, a coupling agent, a lubricant, an antioxidant, a flame-retardant and smoke-suppressing synergist, and octavinyl cage-like polysilsesquioxane, among other raw materials. The matrix resin is a compound of ethylene-octene copolymer, POE-g-MAH, and polyborosilazane. The composite flame-retardant system and the composite shielding system synergistically enhance each other's effects. The preparation method involves mixing the raw materials, then melt-blending, granulating, and drying them using a twin-screw extruder to obtain the finished product. This cable material possesses both high flame-retardant and high shielding properties, solving the problem of single cable materials being unable to simultaneously achieve both flame-retardant and shielding performance. It is suitable for various cable applications with high requirements for shielding and flame retardancy, and has strong practicality.

Modified zeolite may include a microporous framework including a plurality of micropores having diameters of less than or equal to 2 nm, wherein the microporous framework includes at least silicon atoms and oxygen atoms; a plurality of mesopores having diameters of greater than 2 nm and less than or equal to 50 nm, wherein the plurality of mesopores are ordered with cubic symmetry. The modified zeolite also includes: isolated terminal primary amine functionalities bonded to silicon atoms of the microporous framework; or silazane functionalities, wherein the nitrogen atom of the silazane bridges two silicon atoms of the microporous framework; or both.

The invention relates to the field of hydrosilylation, in particular to a high-efficiency catalyst for hydrosilylation and a preparation method thereof, and provides a preparation method of a microcapsule type catalyst, methyl-terminated hydroxyl silicone oil is modified by silazane, and then a microcapsule coating system is formed by the modified methyl-terminated hydroxyl silicone oil and paraffin. The release performance of a microcapsule coating system is improved, so that the catalyst has relatively low reaction activity at the initial release stage, the uniformity of the reaction process in the silicone rubber is improved, and the transparency and the overall strength of the silicone rubber are further improved.