24 results about "Azane" patented technology

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 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 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.

Provided are: a method for producing a modified polysilazane cured coating film, with which it is possible to densify a film comprising a polysilazane compound in a short period of time; and a modified polysilazane cured coating film obtained by means of the method for producing the modified polysilazane cured coating film. A film having a sufficiently low water vapor transmission rate is produced in a short period of time. When curing the polysilazane compound, a coating material containing the polysilazane compound is irradiated with vacuum ultraviolet light (VUV) at an irradiation intensity within a specific range. Specifically, the method comprises: a coating step for coating a substrate with a solution containing a polysilazane compound represented by general formula (1) to form a coated article; and a curing step in which the coating material is irradiated with Xe excimer light to modify the polysilazane compound to form a cured film of the modified polysilazane compound, the illumination of the Xe excimer light in the curing step being in the range of 280-450 mW / cm2. General formula 1

The invention relates to the technical field of preparation of composite silicone rubber, in particular to polysilazane composite resin as well as a preparation method and application thereof. The preparation method comprises the following steps: by taking branched polysilazane as a curing agent, mixing silicone oil and branched polysilazane in the presence of a catalyst, carrying out curing treatment, attacking a silicon-nitrogen bond in the branched polysilazane by a silicon hydroxyl group in the silicone oil in the curing treatment process, breaking the silicon-nitrogen bond and forming a new silicon-oxygen bond, thereby obtaining the polysilazane composite resin, the branched polysilazane with higher functional group density is used as the curing agent, the prepared polysilazane composite resin has high elongation and tensile property, and the problem of insufficient crosslinking efficiency caused by poor compatibility and low functional group density of traditional linear / cyclic polysilazane is solved, so that the rapid curing of the resin is realized.

This invention provides a click chemistry-based durable flame-retardant TPE composite material and its preparation method, belonging to the field of polymer material modification technology. The material includes: 10-60 parts of modified SBS prepared by click chemistry, 5-40 parts of filler oil, 2-15 parts of polypropylene, and 10-20 parts of silazane-modified microencapsulated flame retardant. This invention imparts flame-retardant and anti-aging properties to the matrix through click chemistry modification of SBS. Simultaneously, the silazane-modified microencapsulated flame retardant shell contains a benzene ring structure with char-forming function and flame-retardant elements such as silicon, nitrogen, and phosphorus, which work synergistically with the core flame retardant to improve the flame-retardant performance and flame-retardant rating of the material. Furthermore, the microencapsulated organic shell improves the compatibility of the flame retardant and the mechanical and durability properties of the flame-retardant TPE material. The benzene rings and phosphorus-carbon bonds in the flame retardant also enhance the heat aging resistance of the TPE, further strengthening the flame-retardant and heat-aging properties of the TPE material.

The present invention provides (A) a polysilazane compound that has structures represented by formulae (A-1), (A-2), and (A-3) and does not have a hydrosilyl group (in the formulae, each R is a group selected from among an aliphatic hydrocarbon group having 1 to 6 carbon atoms and a phenyl group, and the R groups may be the same as or different from each other in the polysilazane compound, provided that the ratio of the phenyl group to the total amount of the R groups is 0.3 or less). The polysilazane compound is characterized in that the ratio of each structural unit to the polysilazane compound satisfies all of formulae (1) to (3).　Formula (1): (A-1) + (A-2) + (A-3) = 1; formula (2): 0.2 ≤ (A-1) ≤ 0.7; and formula (3): 0 < (A-2) ≤ (A-3) × 4. Thus, provided is a material which has a high and tunable refractive index, has high heat resistance, and is capable of bonding members with sufficient strength.

The invention provides low-oxygen-content silicon nitride powder and a preparation method thereof, and belongs to the technical field of silicon nitride preparation. The preparation method comprises the following steps: by taking amine with a steric hindrance group as a raw material, synthesizing a nitrogen-loving and oxygen-phobic polysilazane precursor capable of resisting water decomposition and erosion; a precursor and a catalyst precursor are co-wrapped by PEG-PPG-PEG, so that excellent dispersity of final powder is preset, a catalyst is pre-embedded for a subsequent carbon removal step, and mild low-temperature curing is realized through supercritical ammonia; in the step-by-step pyrolysis process, the template is firstly removed to physically isolate particles, then the pre-buried catalyst is activated, and solid residual carbon is actively converted into gas to be removed; in the high-temperature crystallization stage, the rule that impurities are naturally segregated to particle surfaces is utilized, high-activity gas-phase chemical etching is assisted for surface treatment, solid oxygen impurities are converted into volatile gaseous products to be removed, and the low oxygen content of the final product is ensured.

The invention discloses a preparation method of an aluminum-containing high-temperature-resistant coating, which comprises a component A and a component B. The component A is prepared by mixing methyl phenyl organic silicon resin, an organic solvent, a flexibilizer, a leveling agent, an anti-settling agent, double-layer coated aluminum powder, modified carbon nanotubes and the like, and the component B is prepared by mixing the methyl phenyl organic silicon resin, the organic solvent, the flexibilizer, the leveling agent, the anti-settling agent, the double-layer coated aluminum powder, the modified carbon nanotubes and the like. And the component B is prepared by mixing polysilazane and 1-hydroxyethyl-3-methylimidazolium p-toluenesulfonate, and the component B is prepared by mixing the components. The obtained coating is low in curing temperature and has excellent corrosion resistance and high temperature resistance.

The application provides a preparation method of hydrophobic and oleophobic polyorganosilsesquioxane spherical microparticles. A binary catalytic system of a ruthenium complex with a tertiary phosphorus coordination group and an alkaline compound is used to hydrolyze polyorganosilsesquioxane molecular chains on the surface of polyorganosilsesquioxane spherical microparticles, to construct a rough micro-nano structure similar to chemical etching on the surface, and to convert part of the silicon-oxygen bonds on the surface into silicon hydroxyl groups. Then, a perfluoroalkylsilazane solution is added, and the perfluoroalkylsilazane reacts with the silicon hydroxyl groups, so that fluorine-containing alkylsiloxane is grafted to the surface of the polyorganosilsesquioxane particles to obtain modified polyorganosilsesquioxane spherical microparticles, which have superhydrophobicity and superoleophobicity, are insoluble in organic solvents, and have self-cleaning properties for hydrophilic and oleophilic pollutants.

This invention discloses a fluorinated modified organopolysilazane, its preparation method, and its applications. The fluorinated modified organopolysilazane is prepared by alcoholysis reaction of the organopolysilazane and a fluorinated alcohol monomer. The fluorinated modified organopolysilazane is chemically bonded to the substrate surface to form a firmly bonded protective film. The fluorinated polysilazane coating formed by hydrolysis in air exhibits hydrophobicity, resistance to high and low temperatures, scratch resistance, rainproofing, anti-fogging, and self-cleaning properties.

This invention discloses a polysilazane-functionalized vegetable oil-based anti-adhesion coating, its preparation method, and its application, belonging to the field of polymer coating technology. A method for preparing the anti-adhesion coating involves obtaining the polyhydroxy vegetable oil through a thiol-double bond addition reaction; mixing the polyhydroxy vegetable oil, polysilazane, and a curing agent to obtain the anti-adhesion coating; and curing the anti-adhesion coating to obtain the coating. This invention utilizes the interaction between the hydroxyl groups on the polyhydroxy vegetable oil, the -Si-OH generated after hydrolysis of the polysilazane, and the -NCO or -NCH2OH / -NCH2OR on the curing agent in the coating matrix to form a polymer coating with high crosslinking density. Furthermore, the use of polysilazane reduces the surface free energy of the coating. The anti-adhesion coating of this invention has a water contact angle ≥105.9°, a hexadecane contact angle ≥35.8°, and a surface free energy ≤22.98 mJ / m². 2 The coating surface has a bacterial anti-adhesion rate of over 90.6%, and features high transparency, high hardness, excellent adhesion, anti-adhesion performance, anti-oil pen ink performance, and self-cleaning performance.

This invention provides a hydrophobic and anti-corrosion composite material, its preparation method, and its application, relating to the field of coating materials technology. The hydrophobic and anti-corrosion composite material, by weight, comprises or is prepared from raw materials comprising the following components: polyphenylene sulfide resin: 68-90 parts; polysilazane-modified fluorinated graphene composite filler: 10-30 parts; compatibilizer: 2-4 parts; antioxidant: 0.1-0.5 parts; lubricant: 0.5-1.5 parts; optionally, corrosion inhibitor: 0.5-5 parts; wherein the raw materials for the polysilazane-modified fluorinated graphene composite filler include fluorinated graphene and polysilazane, with a weight ratio of fluorinated graphene to polysilazane of 1:(1-1.8). In the hydrophobic and anti-corrosion composite material provided by this invention, polysilazane chemically bonds with the PPS matrix and compatibilizer, and the polysilazane coating layer effectively inhibits the aggregation of fluorinated graphene sheets, achieving a synergistic unity of strength, toughness, and adhesion.

This invention relates to a tough and transparent coating capable of withstanding extreme environments, its preparation method, and its applications, belonging to the field of functional material preparation technology. The coating primarily consists of trapezoidal polysilsesquioxanes forming a continuous, dense inorganic network structure. By controlling the hydrolysis and condensation reactions of polysilazanes and aminosilanes in a solution system, a continuous network with trapezoidal polysilsesquioxanes as the main connecting units is constructed in situ, effectively suppressing disordered cross-linking during the hydrolysis-condensation process. This preparation method features mild process conditions and simple operation, suitable for large-area preparation of micron- or submicron-sized transparent coatings using solution methods. The resulting coating maintains high optical transparency while also possessing high surface hardness, good flexibility, and stable adhesion properties. It also maintains stable performance under extreme environmental conditions such as high and low temperature cycling, irradiation, and atomic oxygen, making it suitable for applications in aerospace components, flexible displays, or optical devices.

The invention provides a high-barrier PET (polyethylene terephthalate) copolyester, a preparation method of the high-barrier PET copolyester and application of the high-barrier PET copolyester in preparation of a high-barrier polyester container, and relates to the technical field of high polymer materials, the high-barrier PET copolyester is prepared from the following raw materials: at least one of cyclic dihydric alcohol and cyclic dicarboxylic acid compounds, and a phthalic acid compound, ethylene glycol, a blocking agent and a catalyst. The blocking agent comprises a nano gamma-AlOOH master batch with PET as a base material, and optionally, the nano gamma-AlOOH is subjected to surface modification through an organic silazane compound. The high-barrier PET copolyester provided by the invention has good barrier property, temperature resistance, transparency and color value.

The invention discloses an anticorrosive coating containing graphene modified polysilazane and a preparation method of the anticorrosive coating, and relates to the technical field of metal surface anticorrosive coatings. The invention provides an anticorrosive coating containing graphene modified polysilazane. The anticorrosive coating at least comprises the following raw materials in parts by mass: 30-50 parts of zinc powder; 20 to 40 parts of long-chain alkyl modified organic polysilazane; 0.5 to 5 parts of fluorine-containing modified trimethoxy hydrogen silane grafted graphene oxide; 25-40 parts of an organic solvent; 0.5 to 2 parts of a thixotropic anti-settling agent; 0.05 to 0.5 part of a curing catalyst; and 0.5 to 1.5 parts of an interface reinforcing agent. The anticorrosive paint containing graphene modified polysilazane prepared by the invention has high corrosion resistance, high adhesive force, high flexibility, high stability and weather resistance and heat resistance, and can be widely applied to protection of metal components in severe corrosive environments such as ocean engineering and petrochemical engineering.

This application provides a molecular sieve catalyst, its preparation method, and its application. The preparation method includes the following steps: crystallizing a raw material solution including a structure-directing agent and a raw material source to obtain a molecular sieve precursor, the molecular sieve precursor including the structure-directing agent; subjecting the molecular sieve precursor to a first calcination treatment to obtain a first calcined product; subjecting the first calcined product to a first shaping treatment in a first shaping solution including a first shaping agent to obtain a catalyst precursor; the first shaping agent includes at least one selected from organosilane compounds, organosilazane compounds, organic amine compounds, ionic liquids, and organic acid compounds; and subjecting the catalyst precursor to ammonium exchange treatment and ammonium calcination treatment sequentially to obtain the molecular sieve catalyst. The preparation method of this application can prepare molecular sieve catalysts with suitable acidity, thereby helping to overcome the bottlenecks in improving the yield of target products by molecular sieve catalysts.

The application discloses electromagnetic sealing material with dielectric and magnetic double loss function and a preparation method thereof, and belongs to the electromagnetic material field. TiO2 powder and K2CO3 solution are added into NiCl2 solution to obtain a mixed solution; the mixed solution, B2O3 and carbon black are subjected to plasma ball milling, and vacuum high-temperature calcination is performed to obtain TiB2 powder; the powder is mixed with spherical FeSiAl powder, and plasma ball milling is performed to obtain powder A, which comprises flaky FeSiAl, fibrous and granular TiB2; powder A is mixed with A-151 coupling agent, KH-570 coupling agent and ethanol, and is dried to obtain powder B, which comprises activated FeSiAl and TiB2 powder; powder B is mixed with liquid phenyl silicone rubber, nano cerium oxide, nano titanium dioxide, hydrophobic fumed white carbon black, KH silicon azane curing agent and dibutyltin dilaurate to obtain electromagnetic sealing material with dielectric and magnetic double loss function.

The application belongs to the technical field of organic silicone adhesive, and discloses a single-component organic silicone hot bonding adhesive capable of being cured in segments, and a preparation method and application thereof. The preparation method is as follows: first, end-vinyl silicone oil, hexamethyl disilazane and fumed white carbon black are mixed, kneaded and ground to obtain a first base material; then, methyl MQ silicone resin, methyl-vinyl silicone rubber, hydrogen-containing silicone oil, inhibitor and diluent are mixed and dispersed to obtain a second base material; finally, tackifier and latent platinum catalyst are added. The single-component organic silicone hot bonding adhesive prepared by the application forms a hot bonding adhesive prepreg after initial curing, and has extremely low peeling force at normal temperature, is easy to peel off from a release film during use, and the adhesive surface is still flat and undamaged when the adhesive surface is pressed against the bonding surface. After the prepreg is hot-pressed during use, the cross-linking is complete, the bonding with the base material is tight, the peeling force is high, and the high strength required for long-term use can be achieved.

The application provides a kind of regenerated bio-based polyether polyol and its preparation method and application, it is related to waste polyurethane recycling field.The preparation method of regenerated bio-based polyether polyol includes: make waste polyurethane react in alcoholysis system, obtain regenerated bio-based polyether polyol, wherein, alcoholysis system includes: alcoholysis agent, vegetable oil, polysilazane and catalyst.The preparation method of regenerated bio-based polyether polyol provided by the application, reaction condition is significantly mild: by introducing polysilazane as synergistic degradation aid, its high-activity Si-N bond can effectively attack and activate urethane bond of polyurethane at lower temperature, and the synergistic effect of ester exchange reaction of vegetable oil and high selectivity catalysis of catalyst reduces the activation energy of the whole alcoholysis process.

The invention belongs to the technical field of insulated cable materials, and particularly relates to an insulated high-voltage cable and a preparation method thereof. According to the invention, a multi-arm epoxy compound and an unsaturated monomer containing a phenolic hydroxyl group are subjected to a ring-opening reaction to synthesize a modified cross-linking agent containing an epoxy group and an unsaturated double bond, and at the same time, the modified cross-linking agent is hydrophobized by using a cyclosilazane modified aluminum hydroxide insulating filler and imino-N-H is introduced; and carrying out chemical crosslinking on the modified cross-linking agent and the polyethylene resin in the presence of a free radical initiator at high temperature. Under the action of an electric field, mobile charges in the insulating material are reduced, so that injection and accumulation of space charges near two poles are effectively inhibited, accumulation of the space charges in the insulating material is inhibited, the space charge distortion rate is reduced, and the direct-current breakdown strength of the cable is improved; the long-term operation stability of the cable is improved; and the service life is prolonged.

The invention provides a durable flame-retardant TPE composite material based on click chemistry and a preparation method thereof, and belongs to the technical field of high polymer material modification, the durable flame-retardant TPE composite material comprises 10-60 parts of modified SBS prepared based on click chemistry, 5-40 parts of filling oil, 2-15 parts of polypropylene, and 10-20 parts of a silazane modified microencapsulated flame retardant. According to the invention, a matrix is endowed with flame-retardant and anti-aging properties by clicking chemical modified SBS, meanwhile, a shell layer of the silazane modified microencapsulated flame retardant contains a benzene ring structure with a charring function and flame-retardant elements such as silicon, nitrogen and phosphorus, the shell layer and a capsule core flame retardant play a role in core-shell synergistic flame retardance, and the flame-retardant property and the flame-retardant level of the flame-retardant material are improved; in addition, the microencapsulated organic shell layer can improve the compatibility of the flame retardant and the mechanical and durability of the flame-retardant TPE material, and the flame retardant contains benzene rings and phosphorus-carbon bonds, so that the thermal aging resistance of the TPE material can be improved, and the flame retardance and thermal aging resistance of the TPE material are further enhanced.

The application relates to the field of high polymer materials, and particularly provides a silicon nitride ceramic precursor and a preparation method thereof. The preparation method comprises the following steps: S100, carrying out an ammonolysis reaction on trimethylsilyl-substituted amine halosilane, adding an acid-binding agent, and obtaining an oligomeric silazane; and S200, carrying out a heating treatment on the oligomeric silazane under an inert atmosphere, and obtaining the silicon nitride ceramic precursor. The trimethylsilyl-substituted amine halosilane is introduced into a liquid ammonia system, and the ammonolysis is carried out in cooperation with the acid-binding agent, the standing and separation and the cross-linking and solidification, so that the treatment process of by-products such as ammonium halide can be obviously simplified, and the chemical purity and the ceramic yield of the silicon nitride ceramic precursor and pyrolysis products can be improved.

A stress relaxation gas barrier film, including one or more cured film layers and one or more stress relaxation layers alternately stacked,the one or more cured film layers being a cured product of a polysilazane composition containing a polysilazane compound represented by the following formula (1):the one or more stress relaxation layers being a cured product of a silicone resin composition containing a linear organopolysiloxane represented by the following formula (A-1), and each having a film thickness of 0.1 to 15.0 μm:This can provide a gas barrier film with stress relaxation properties such that uniform application to a film or polysilazane resin is possible and workability does not deteriorate.