89 results about "Azane" patented technology

A process for producing a hydrophobic silica powder, comprises the steps for hydrophobic treatment of: adding to an aqueous silica sol containing hydrophilic colloidal silica having a specific surface area of 5.5 to 550 m²/g, a disilazane compound represented by formula (1)

(R¹₃Si)₂NH  (1)

wherein each R¹ is C_1-6alkyl group or phenyl group that is selected independently of one another, in an amount of 0.1 to 10 mmol per surface area 100 m² of the hydrophilic colloidal silica, to obtain a first mixture of the aqueous silica sol and the disilazane compound; and heating the mixture at a temperature of 50 to 100° C. for aging it to obtain a slurry as dispersion of hydrophobic treated colloidal silica. The process provides a hydrophobic silica powder through a simple hydrophobic treatment step.

The invention discloses a synthesis method of fluoride-containing polysilazane-polysiloxane resin and a method for preparing durable rainproof agent coating applied on the surface of glass. The method comprises the following steps of: carrying out partial hydrolysis on fluoride-containing chlorosilane monomer mixture to form polysiloxane prepolymer, and then carrying out amido exchange reaction with hexamethyldisilazide to prepare fluoride-containing polysilazane-polysiloxane polymer. The polysilazane and polysiloxane are combined together with the surface of glass to form a firmly-combined protecting film by chemical bonds. The fluoride-containing polysiloxane elastomer coating formed by hydrolysis in the air has the advantages of hydrophobicity performance, high/low temperature resistance and scribing resistance, and also has the functions of being rainproof, anti-fog and self-cleaning.

The invention discloses a chemical vapor crosslinking method for a polyborosilazane fiber, which comprises the following operation steps of (1) placing a polyborosilazane fibril in a chemical vapor crosslinking system, vacuumizing, displacing system gas with high-purity nitrogen or high-purity argon to a normal pressure, and repeating for three times, (2) introducing boron hydride compound gas to the normal pressure after vacuumizing, (3) conducting temperature programming to 50-100 DEG C for reaction for 0.5-25h, and (4) conducting temperature programming to 350-500 DEG C, keeping warm for 0.5-12h, and cooling to a room temperature. The method has the following advantages that (1) no catalyst is needed, no oxygen is needed, and a dehydrogenation coupled reaction can be conducted at a temperature below a melting point of polyborosilazane, so that crosslinking of the polyborosilazane fiber is realized; (2) no equipment change on the existing chemical vapor crosslinking system is needed; and (3) the method is simple in technology and is suitable for large-scale production.

A process for preparing curable oligomeric and/or polymeric polysilazanes comprises (a) forming at least one dihalosilane-base adduct by reacting at least one dihalosilane with at least one base; (b) optionally, combining at least one dihalosilane-base adduct and at least one organodihalosilane; and (c) carrying out ammonolysis of at least one dihalosilane-base adduct or of the resulting combination of at least one dihalosilane-base adduct and at least one organodihalosilane; with the proviso that the base (1) is used for the dihalosilane-base adduct formation in a limited amount that is less than or equal to twice the stoichiometric amount of silicon-halogen bonds in the dihalosilane or (2) is used for the dihalosilane-base adduct formation in excess of this limited amount and, prior to the ammonolysis, the total amount of the resulting reacted and unreacted base is reduced to no more than this limited amount.

The invention discloses a process for preparing tetramethyldivinyldisilazane by conversion of divinyl tetramethyl disiloxane. The process comprises steps of: (1) esterification reaction: first adding concentrated sulfuric acid into a dropping tank, and then adding thedivinyl tetramethyl disiloxane and petroleum benzene into a stirring kettle; then dropwise adding concentrated sulfuric acid into the stirring kettle, stopping stirring after reaction, releasing dilute sulfuric acid at the bottom upper, and introducing upper crude product into an ammoniation reactor; (2) ammoniation: opening a circulating water pump and mixing, opening an ammonia inlet valve, and introducing ammonia slowly; and (3) distillation: adding clear liquid into a rectification tower kettle, recovering petroleum benzene and intermediate distillate intermittently for recycling, and then recovering tetramethyldivinyldisilazane, so as to finally leave the target product of tetramethyldivinyldisilazane in the tower kettle. The process of the invention adopts a compressor recovery unit to carry out secondary amination synthesis and usage of ammonia, and avoids ammonia waste caused by the reaction pressure requirement.

The invention relates to a method for preparing boron nitride ceramic fiber precursor polymer, the method comprises the following steps: the anhydrous toluene solution of cyclic trichloroboron azane is cooled to 80 DEG C below zero-70 DEG C below zero, anhydrous toluene solution of methylamine is dripped, and the reaction endures 1-10 hours under -40 DEG C below zero -0 DEG C, and then endures 10-20 hours under room temperature, and is subsequently filtered; the boron trichloride is condensed in anhydrous toluene solution of methylamine (40 DEG C below zero - 80 DEG C below zero), stirred for reaction for 1-10hr, and then stirred for 5-20hr under room temperature, and then filtered; the filtrates are combined, stirred for 2-4hr under 10 DEG C below zero -0 DEG C, stirred for 5-10hr under room temperature, and then filtered; the filtrates react for 10-60min under 50-100 DEG C, the toluene is evaporated out under 100-120 DEG C, and then react for 5-20hr under 160-170 DEG C. The precursor polymer synthesized by the method has a proper linear shape and a mesh structure, and has sound spinnability and wave-penetrating performance.

The invention discloses a polysilazane-zirconium dioxide composite aerogel material as well as a preparation method and application thereof. The preparation method comprises the following steps: dispersing a polysilazane precursor in methylbenzene, successively adding zirconium n-butoxide and divinyl benzene, rapidly and uniformly stirring, obtaining a mixed dilute solution, transferring the mixeddilute solution into a hydrothermal reaction kettle, sealing the hydrothermal reaction kettle, placing the reaction kettle with the mixed dilute solution in a drying box, performing the reaction, cooling to room temperature to obtain wet gel, and standing the wet gel in a beaker with the methylbenzene; and transferring a product of the step 1 into a carbon dioxide supercritical extraction apparatus, soaking in liquid carbon dioxide, supercritically drying, and obtaining the polysilazane-zirconium dioxide composite aerogel material. The polysilazane-zirconium dioxide composite aerogel materialis a novel nano porous composite material, has high porosity, high specific surface area and low density; and the preparation condition is mild, and the process is simple and controllable.

The invention provides a flexible substrate repair structure, a manufacturing method, and a detection and repairing method. The flexible substrate repair structure includes a flexible substrate and at least one repairing layer, regular sunken parts formed on the flexible substrate. The repairing layer is located on the flexible substrate and fills the regular sunken parts. The material of the at least one repairing layer includes a polysilazane compound, which is represented as the chemical formula (I), wherein Rx, Ry, and Rz are repsectively hydrogen atoms, substituted alkyl groups, non-substituted alkyl groups, alkenyl groups, or aromatic groups, carbon number being 1 to 10. The repairing layer can avoid or reduce problems of cracks or ruptures on a film layer on the flexible substrate.

Disclosed is a composition for a silica-based insulation layer including hydrogenated polysilazane or hydrogenated polysiloxzane, wherein a concentration of a cyclic compound having a weight average molecular weight of less than 400 is less than or equal to 1,200 ppm. The composition for a silica-based insulation layer may reduce a thickness distribution during formation of a silica-based insulation layer, and thereby film defects after chemical mechanical polishing (CMP) during a semiconductor manufacturing process may be reduced.

The invention discloses methyl polysilazane resin and a preparation method thereof, the methyl polysilazane resin controls the raw material input amount of methyldichlorosilane and trichlorosilane inammonolysis raw materials, and six-membered and eight-membered ring-shaped and linear methyl polysilazane mixtures with Si-N and methyl double chains on side chains are synthesized; the addition amount of the raw materials of the methyl polysilazane resin is as follows: the mass ratio of methyl dichlorosilane to trichlorosilane is 1: (0.8-1.2); the mass ratio of the proton inert solvent to the nitrogen silane is 7-12: 1; the molar ratio of the introduction amount of the ammonia gas to the chlorosilane is (5-12): 1, and the total amount of the chlorosilane is the sum of methyl dichlorosilane and trichlorosilane. The invention relates to a brand-new preparation method of methyl polysilazane resin, the methyl polysilazane resin has strong adhesive force, high temperature resistance, corrosionresistance, weather resistance, hydrophobicity, antifouling property and other comprehensive properties, and compared with the preparation method of foreign similar products, the preparation method is simpler and more convenient to operate and less in environmental pollution.

The invention discloses a high-temperature-resistant wear-resistant brake pad which comprises a steel plate, a heat-insulation layer and a friction block. The friction block is prepared from a phenolic resin, biphenyl polyimide powder, superfine total vulcanized powder rubber, octaanilino POSS (polyhedral oligomeric silsesquioxane), polyurethane powder, an epoxy resin, silicon carbide whiskers, high silica fibers, potassium titanate whiskers, aluminum borate whiskers, basic magnesium sulfate whiskers, nano paligorskite, barium carbonate, aluminum nitride powder, calcined coke, zinc sulfide, titanium carbide, vermiculite, mica, molybdenum disulfide, natural graphite, zirconium dioxide microspheres, multi-wall carbon nanotubes, polyboron azane, boron carbide and epoxy soybean oil. The high-temperature-resistant wear-resistant brake pad disclosed by the invention has the advantages of excellent high temperature resistance, excellent wear resistance, excellent heat stability, favorable braking property and long service life.

A preparation method of a poly-zirconium-boron-silazane precursor comprises the following steps: 1, weighing an organic zirconium compound, boron haloalkane, halogenosilane and micromolecular disilazane at the molar ratio of 1:(0.1-10):(0.1-10):(3-30); 2, respectively dissolving the boron haloalkane and the halogenosilane in organic solvents; 3, adding the organic zirconium compound to a reaction vessel, vacuumizing, filling dry nitrogen gas and precooling the reaction vessel; 4, adding the organic solvent of the boron haloalkane adn the organic solvent of the halogenosilane to the reaction vessel, and dripping the micromolecular disilazane in the reaction vessel; 5, after the dripping is finished, heating the reaction vessel to 150-500 DEG C, and preserving heat for 2-30 hours; 6, cooling the reaction vessel to 120-350 DEG C, distilling under reduced pressure and cooling to the room temperature. The poly-zirconium-boron-silazane precursor prepared according to the method is especially suitable for preparing ultra-high temperature ceramic materials.

The invention relates to a temperature-sensitive color-changing agent and a preparation method and application thereof, and belongs to the field of fine chemical engineering technology and functional material preparation. The temperature-sensitive color-changing agent comprises temperature-sensitive color-changing powder and a modifier; the modifying agent is nitrogen-containing silane or chlorine-containing silane; the mass ratio of the thermochromic powder to the modifier is 1: (0.05-0.15). The temperature-sensing color-changing agent is subjected to surface treatment through hexamethyldisilazane or dimethyldichlorosilane, so that the capsule shell is more stable and more resistant to chemical corrosion and mechanical extrusion, and on the other hand, capsule powder obtained after surface treatment is more easily dispersed into silica gel. And if not treated, the color change function is lost in the product storage process or along with the increase of the use time.

Some variations provide a preceramic resin precursor formulation comprising: first molecules comprising at least one Si—C bond and/or at least one Si—N bond, wherein the first molecules include at least one silyl hydride group (Si—H) available for hydrosilylation; and second molecules with at least one unsaturated carbon-carbon bond attached to a UV-active functional group. The first molecules and second molecules may be reacted, via hydrosilylation with a homogeneous or heterogeneous metal-containing catalyst, to produce third molecules comprising a hydrosilylation-modified polysilazane that contains the UV-active functional group. Many possible starting formulations are described, and methods are disclosed for carrying out the chemical reactions to generate the hydrosilylation-modified polysilazanes. The hydrosilylation-modified polysilazanes may then be 3D-printed and thermally treating to fabricate a ceramic material.

A transparent coating film forming composition contains: (A) a polysilazane having units represented by the following formulae (1) and (2), and having predetermined modification rate and weight average molecular weight,

(B) an organic solvent containing (B-1) and (B-2), (B-1) an organic solvent having a dielectric constant of 2.1 to 15.0 on average and a higher boiling point under atmospheric pressure (1013 hPa) than that of an organic solvent contained as the component (B-2), and (B-2) a saturated aliphatic hydrocarbon organic solvent; and (C) a predetermined curing catalyst. The mixing ratio of the component (A) and the component (B) satisfies a predetermined range. This provides a transparent coating film forming composition using an organic solvent having high polysilazane solubility, volatility at an appropriate speed during application, high safety and workability, the composition enabling formation of a coating film that is uniform and has high transparency and hardness after curing.

The invention relates to synthesis of vinyl polysilazane and application of vinyl polysilazane in an anti-doodling coating, and the synthesis comprises the following steps: 1) in a benzene solution of methyl vinyl dichlorosilane, stirring, introducing ammonia gas, reacting at 300 DEG C for more than or equal to 4 hours, filtering, and carrying out reduced pressure suction filtration to obtain micromolecular methyl vinyl silazane; (2) carrying out ammonolysis on dimethyldichlorosilane and methyl dichloro hydrogen-containing silane to obtain an intermediate, carrying out nitrogen protection, slowly heating to 300 DEG C, carrying out heat preservation reaction for more than or equal to 4 hours, and carrying out reduced pressure distillation to remove a low-molecular polymer, so as to obtain a polysilazane polymer; and (3) mixing the products in the steps (1) and (2) according to a mass ratio of 5: (1-10), evaporating to remove the solvent under the protection of nitrogen, and reacting at 200 DEG C for 24 hours to obtain vinyl polysilazane. The preparation method comprises the following steps: uniformly mixing vinyl polysilazane, high-activity UV resin, a cross-linking agent, a catalyst, a photoinitiator, a solvent and an anti-pollution additive, spraying, and curing by ultraviolet irradiation. The preparation method is safe in reaction temperature and high in repeatability, and can be used for preparing the fast-curing anti-fouling easy-to-clean vinyl polysilazane coating.