73 results about "Platinum catalyst" patented technology

This invention relates to the field of potting compound technology, and more particularly to a thermally conductive potting compound, its preparation method, and its application method. The invention provides a thermally conductive potting compound comprising component A and component B; component A, by weight, comprises: 24-28 parts of thermally conductive base adhesive; 0.7-1.0 parts of vinyl silicone oil; 0.05-0.15 parts of platinum catalyst; and 0.04-0.12 parts of colorant; component B, by weight, comprises: 24-28 parts of thermally conductive base adhesive; 0-0.4 parts of vinyl silicone oil; 0.8-0.9 parts of hydrogen-containing silicone oil; and 0.005-0.015 parts of inhibitor; the inhibitor includes ethynylcyclohexanol and / or methylbutynol. The thermally conductive potting compound provided by this invention has ultra-high thermal conductivity, low volatility and low viscosity, excellent mechanical properties, excellent electrical insulation properties, and superior storage stability, exhibiting no clumping or agglomeration after 6 months of storage.

This application relates to the field of protective film materials technology, and discloses a weather-resistant and high-temperature-resistant silicone leather protective film and its preparation method. The weather-resistant and high-temperature-resistant silicone leather protective film of this application comprises a knitted fabric substrate layer and an organosilicon composite layer stacked sequentially from bottom to top; wherein, the raw materials of the organosilicon composite layer include: methyl vinyl silicone rubber, modified fumed silica, hydroxyl silicone oil, hydrogen-containing silicone oil, platinum catalyst, UV stabilizer, flame retardant, and antioxidant; the modified fumed silica is obtained by modifying fumed silica with a composite silane coupling agent, and the specific surface area of ​​the fumed silica before modification is 200~400 m² / g. 2 / g. The preparation method of this application is simple and efficient. Through the steps of substrate pretreatment, mixing of adhesives, composite molding, and post-treatment, the resulting weather-resistant and high-temperature resistant silicone leather protective film has excellent mechanical strength, weather resistance, high-temperature resistance, and flame retardant properties.

The application relates to the technical field of organic silicon synthesis, and particularly discloses a high-selectivity platinum catalyst and a vinyl double-seal head synthesis method. The high-selectivity platinum catalyst comprises a carrier and a platinum active component loaded on the carrier, the platinum active component is obtained by reducing and activating a platinum precursor and a ligand under a hydrogen atmosphere at 250-350 DEG C after coordination modification, and the molar ratio of the ligand to the platinum element in the platinum precursor is 2-3:1. In the application, the platinum active component is obtained by reducing and activating the platinum precursor and the ligand after coordination modification, and the ligand and the platinum element form a specific coordination structure of the platinum active center, guide the direct silicon-hydrogen addition reaction of acetylene and a hydrogen-containing double-seal head, thus the dimethyl chlorosilane intermediate is not needed, the process flow is simplified, and the effects of improving the reaction yield, environmental protection and process economy are achieved.

The application relates to the technical field of platinum catalysts, and particularly discloses an anti-yellowing platinum catalyst capable of prolonging the curing time and a preparation method thereof. The platinum catalyst comprises a platinum metal compound, an alkenyl-containing siloxane compound, an alkaline metal salt, an organic solvent and a catalyst carrier; wherein the mass ratio of the platinum metal compound, the alkenyl-containing siloxane compound, the alkaline metal salt and the organic solvent is 1:(8-20):(1.2-3):(6-20). The platinum catalyst has the advantages of being capable of prolonging the curing time and having the anti-yellowing performance, and has a wide application scenario.

The application discloses a propargyl polysiloxane modified cyanate ester resin and a preparation method and application thereof, and comprises the following steps: S1, a propargyl compound shown in formula I and polysiloxane shown in formula II are subjected to a heating reaction in the presence of a platinum catalyst and a solvent to obtain a propargyl polysiloxane; S2, the propargyl polysiloxane is mixed with a cyanate ester monomer, heated and stirred until a transparent solution is obtained, and subjected to a heat curing treatment to obtain the propargyl polysiloxane modified cyanate ester resin. The propargyl polysiloxane modified cyanate ester resin can be cured and formed at a lower curing temperature, and the prepared modified resin has lower dielectric loss, water absorption, higher impact strength and thermal stability, and has a good application prospect in high-end electronic materials.

A SCALABLE MICROWAVE-ASSISTED CONTINUOUS FLOW METHOD FOR SYNTHESIS OF PLATINUM ON CARBON CATALYST AND A SYSTEM THEREOF The present invention relates to a microwave-assisted continuous flow process for synthesis of platinum on carbon catalyst with shorter residence times and providing a high throughput. Further, the present invention relates to a microwave-assisted continuous flow system comprising two or more continuous stirred tank reactors (2 and 3) connected in series and placed in a microwave oven (6) for synthesizing platinum on carbon (Pt / C). Ref. Figure 1

This invention discloses a high-ductility, bend-resistant, and brittle-resistant thermally conductive silicone material, comprising, by weight: 90-95 parts of a flexible cross-linked matrix, 180-220 parts of a thermally conductive filler, 1.5-2.2 parts of a silane coupling agent, 0.3-0.6 parts of a platinum catalyst, and 0.8-1.5 parts of a rheology modifier. The flexible cross-linked matrix comprises 70-75 parts of vinyl silicone oil, 8-12 parts of hydrogen-containing silicone oil, and 7-10 parts of a flexible toughening silicone resin modifier. The thermally conductive filler comprises 140-170 parts of spherical alumina and 40-50 parts of boron nitride, wherein the boron nitride is in the form of flake powder. This invention's thermally conductive silicone material, through the design of the flexible cross-linked matrix and the thermally conductive filler components and proportions, significantly improves the material's ductility, resilience, tear resistance, and dynamic heat dissipation performance. The preparation process is simple and controllable, and it can be used for long-term service in dynamically moving heat-generating components.

This invention provides a phosphorus-silicon synergistic flame-retardant coolant for immersion liquid cooling and its preparation method, belonging to the field of thermal safety technology for energy storage batteries. The preparation method of the phosphorus-silicon synergistic flame-retardant coolant for immersion liquid cooling includes adding diphenyl phosphate, allyl alcohol, a condensing agent, and an esterification catalyst to a reaction vessel under an inert atmosphere to carry out an esterification reaction, obtaining the intermediate allyl diphenyl phosphate; subsequently, adding 1,1,3,3-tetramethyldisiloxane and a platinum catalyst to the reaction system to carry out a hydrosilylation reaction; after the reaction, purification treatment is performed to obtain a siloxane-bridged phosphate; the obtained siloxane-bridged phosphate is added to a base mineral insulating oil, and a high-efficiency antioxidant is added, followed by uniform mixing to obtain the phosphorus-silicon synergistic flame-retardant coolant. This method can solve the problems of insufficient oxidation stability, easy increase in acid value, and difficulty in simultaneously achieving flame-retardant efficiency and long-term stability in existing coolants under long-term high-temperature operation.

This invention belongs to the field of silicone technology and discloses a self-adhesive mold transfer silicone and its preparation method. The silicone is mainly composed of component A and component B mixed in a mass ratio of 10:1. Component A includes 100 parts of divinyl-terminated polydimethylsiloxane, 25-35 parts of silica, 2-5 parts of tackifier, and 0.1-0.5 parts of platinum catalyst. Component B includes 2-4 parts of hydrogen-containing silicone oil and 0.15-0.2 parts of inhibitor. This invention, through precise proportioning and complementary functions of its components, retains the inherent advantages of addition-cure silicone rubber while specifically solving technical problems such as poor self-adhesion, low mold forming accuracy, insufficient heat resistance during transfer, and cumbersome processing of traditional transfer silicone. Furthermore, the formulation system and preparation method are simple, the raw materials are highly versatile, and it has the advantages of easy industrial production, excellent user experience, and high adaptability for transfer applications.

This invention relates to the field of encapsulant preparation, specifically disclosing a method for preparing an organosilicon encapsulant, comprising the following raw materials: 80-100 parts of vinyl-terminated polydimethylsiloxane, 5-15 parts of epoxy-modified hydrogen-containing mixed cyclic polymer, 10-20 parts of fumed silica, 10-25 parts of high-reinforcing filler MQ resin, 3-8 parts of crosslinking agent, 1.5-3 parts of adhesion promoter, 0.01-0.05 parts of platinum catalyst, 0.1-0.5 parts of inhibitor, 1-3 parts of structure control agent, 5-15 parts of plasticizer, 1-2 parts of dehydrating agent, and 0.5-1.5 parts of antioxidant. During the encapsulant preparation process, epoxy-modified hydrogen-containing mixed cyclic polymer is added. Its cyclic structure provides high-density crosslinking points, and the three-dimensional spherical structure of MQ resin forms a "micro-region reinforcing phase" in the crosslinking network. Under the combined effect of these two components, the tear resistance of the material can be increased to 2-3 times that of traditional formulations.

The application discloses a preparation method of long-chain alkyl green silane coupling agent, comprising the following steps: step one, 10-undecene-1-ol is reacted with chlorosulfoxide under the conditions of low-temperature dropwise adding and medium-temperature preservation, and 11-chloro-1-undecene is obtained through vacuum rectification purification; step two, under the action of a platinum catalyst, 11-chloro-1-undecene is subjected to addition reaction with trichlorosilane, excessive raw materials are removed, and 11-chloro undecyl trichlorosilane is obtained through rectification; step three, 11-chloro undecyl trichlorosilane is subjected to alkoxylation reaction with biological methanol or biological ethanol, by-products and excessive biological alcohol are removed, and high-purity long-chain alkyl green silane coupling agent is obtained through rectification. The carbon sources of raw materials are all biological, the method is green and low-carbon, the product has a long-chain structure, and the product has flexibility, fatigue resistance and aging resistance, and can be further derived into functional silane such as amino, mercapto and thiocyanogen; the long-chain alkyl green silane coupling agent can be widely applied to high-end flexible composite materials such as flexible electronics and robot joints, and effectively improves the service life and safety of the materials.

This invention belongs to the technical field of organosilicon polymer compositions, specifically relating to a silicone gel composition for potting and its application in electronic component encapsulation. It is prepared from vinyl-functionalized methylphenyl silicone oil, inhibitors, crosslinking agents, chain extenders, and a platinum catalyst. Using vinyl-containing siloxanes as vinyl-introducing raw materials, and octamethylcyclotetrasiloxane and phenylcyclotetrasiloxane as basic monomers, a ring-opening polymerization reaction is catalyzed by a catalyst under a protective gas atmosphere. By controlling the gradient heating process, vinyl and phenyl groups are sequentially introduced into the side chains of the molecular chain to obtain an intermediate product. Then, vinyl end-capping is performed to obtain the vinyl-functionalized methylphenyl silicone oil. This invention introduces vinyl functional groups into both the side chains and end groups of the silicone oil, solving the problems of low functionality and insufficient crosslinking density in traditional vinyl-terminated silicone oils. It achieves a three-dimensional dense crosslinking network, significantly improving the heat aging resistance of the silicone gel and meeting the requirements of electronic-grade potting compounds.

Disclosed is a catalyst for hydrogen evolution reaction or hydrogen oxidation reaction, which is a catalyst that can be used under alkaline conditions and has significantly improved kinetic characteristics compared to existing commercial platinum catalysts. The present invention provides a catalyst for electrochemical hydrogen reaction under alkaline conditions and a method for preparing the same, and a ruthenium-based catalytic electrode containing the same, which can be used as an electrode for anion exchange membrane-based water electrolysis cell and fuel cell, wherein the catalyst has 2 to 20 ruthenium supported in an aggregate form on the surface of a molybdenum carbide-carbon nanocomposite carrier.

The application belongs to the technical field of adhesives, and relates to a kind of organic silicon foaming glue and its preparation method.The organic silicon foaming glue includes component A and component B, the component A includes the following raw materials: vinyl silicone oil, hydroxyl silicone oil, fumed silica, platinum catalyst;The component B includes the following raw materials: vinyl silicone oil, hydrogen-containing silicone oil, fumed silica, flame-retardant microcapsule, inhibitor;Wherein, the core material of the flame-retardant microcapsule is graphene, and the shell material from inside to outside is modified acrylic resin and melamine formaldehyde resin in turn.The organic silicon foaming glue provided in the application solves the problem of high filling amount of existing foaming glue flame retardant and easy leakage of flame retardant in the prior art, and the limiting oxygen index (LOI) of the prepared foaming glue is improved to more than 32%, the vertical burning grade reaches UL94V-0 level, and no melt dripping occurs;The foaming glue remains stable in performance in the range of-60℃~200℃, and after high-low temperature cycle-40℃ / 2h→150℃ / 2h, cycle 10 times, the compression permanent deformation rate is less than or equal to 15%.

The objective is to provide an addition-curing type thermally conductive silicone composition that exhibits stable curability even after long-term storage. [Solution] Components (A) to (E) below, (A) Organopolysiloxanes having alkenyl groups bonded to at least two silicon atoms in one molecule, (B) Organohydrogenpolysiloxanes having two or more hydrogen atoms (SiH groups) bonded to silicon atoms in one molecule, (C) At least one thermally conductive filler selected from the group consisting of metals, metal oxides, metal hydroxides, metal nitrides, metal carbides, and allotropes of carbon. (D) A platinum catalyst composition for hydrosilylation reactions obtained by mixing a platinum group metal complex (Da) having a vinyl group-containing organosiloxane represented by a specific formula as a ligand and a vinyl group-containing organopolysilyloxane (Db) represented by a specific formula, and heat-treating the mixture, and (E) Addition reaction regulator An addition-curing thermally conductive silicone composition characterized by containing [a certain substance].

The application discloses a preparation method of rapidly vulcanized mixed and kneaded silicone rubber and belongs to the technical field of silicone rubber preparation. The method comprises four steps of raw material pretreatment, basic kneading, vulcanization system kneading and vulcanization forming. Raw materials are proportioned according to specific weight parts, 4,4'-diamino diphenyl ether and 3,3'-dimethyl-4,4'-diamino dicyclohexyl methane are compounded as vulcanization accelerators, cooperate with platinum catalysts, and combined with step-by-step kneading process to realize rapid vulcanization of mixed and kneaded silicone rubber. The vulcanization time is shortened to 3-8 min, the vulcanization temperature is reduced to 120-140 DEG C, the vulcanization efficiency is increased by more than 60%, meanwhile, the hardness of the silicone rubber after vulcanization is 50-70 Shore A, the tensile strength is greater than or equal to 3.5 MPa, the elongation at break is greater than or equal to 300%, and the comprehensive performance is excellent. The preparation process is simple, raw materials are cheap and easy to obtain, and the cost is controllable. No special equipment is needed, and the method is easy to realize industrial large-scale production and is suitable for multiple fields such as electronics, automobiles and buildings.

This application discloses a tear-resistant silicone rubber and its preparation method. The tear-resistant silicone rubber comprises: 100 parts of raw silicone rubber, 2-6 parts of hydrogen-containing silicone oil A, 3-8 parts of an interface modifier, 0.05-0.3 parts of a platinum catalyst, 5-10 parts of carbon nanotubes, 5-10 parts of carbon black, and 1-2 parts of a structure control agent. The carbon nanotubes have a metal phthalocyanine complex attached to their surface. The interface modifier molecule contains Si-H and bipyridine groups. The interface modifier is prepared by hydrosilylation of hydrogen-containing silicone oil B with vinyl bipyridine. This application, by introducing a metal phthalocyanine complex onto the surface of carbon nanotubes and using hydrogen-containing silicone oil with bipyridine groups as an interface modifier, enables the silicone rubber to form a dynamic network during crosslinking, thereby achieving good interfacial bonding and significantly improving the tear resistance of the silicone rubber while maintaining excellent toughness.

This invention discloses a method for preparing a carbon-supported platinum catalyst for fuel cells and the platinum catalyst itself. The method includes: dissolving a water-soluble platinum precursor and a weakly reducing complexing agent in a solvent; allowing the mixture to stand at room temperature under static conditions of continuous inert gas circulation and no mechanical stirring to form a homogeneous platinum precursor; adding a reducing agent and allowing it to stand at room temperature for reduction to obtain a platinum metal colloid; then adding a carbon support slurry and stirring for loading; finally, obtaining the carbon-supported platinum catalyst through solid-liquid separation, washing, and drying. This invention eliminates the autocatalytic oxidation of platinum nuclei and local concentration gradients through the synergistic effect of inert gas protection and static conditions, achieving homogeneous nucleation and uniform growth of platinum particles at room temperature. Simultaneously, the "form platinum particles first, then load" process route ensures that the platinum particles are not interfered with by the carbon support during formation, effectively solving the technical problems existing in the prior art.

This invention provides a high thermal conductivity silicone potting compound and its preparation method. The silicone potting compound comprises component A and component B. Component A comprises the following raw materials in parts by weight: 35-50 parts vinyl silicone oil, 40-60 parts composite filler, 6-14 parts silane coupling agent, and 0.05-0.3 parts platinum catalyst. Component B comprises the following raw materials in parts by weight: 20-30 parts vinyl silicone oil, 5-15 parts modified silicone oil, 40-60 parts composite filler, and 0.01-0.05 parts inhibitor. The potting compound of this invention has the advantages of high thermal conductivity, strong flame retardancy, good mechanical properties, long life, and suitable viscosity, making it suitable for the high thermal conductivity potting requirements of electronic devices.

The application discloses a hand feel agent and a preparation method thereof. The hand feel agent is prepared from an MQ type organic polysiloxane containing Si-H and an alpha-olefin as raw materials through a silicon hydrogen addition reaction. In the preparation, a platinum catalyst is used for catalysis under an inert atmosphere, and the product is obtained through temperature rising reaction and removal of solvent and low-boiling substances through reduced pressure distillation. The hand feel agent can form a covalent bond with a leather matrix through secondary crosslinking, and a long-chain alkyl group constructs a dense hydrophobic lubricating layer, so that excellent smoothness, wear resistance, stain resistance and folding resistance are given to synthetic leather. The performance of the synthetic leather is superior to that of a commercial product, the process is simple, the cost is controllable, and the hand feel agent provides a high-quality auxiliary scheme for high-end organic silicon synthetic leather.

The application discloses an anti-icing conductor wire and a preparation method thereof, and belongs to the technical field of functional coating materials. The anti-icing conductor wire comprises a conductor wire and an anti-icing coating layer compounded on the surface of the conductor wire; the anti-icing coating layer comprises a crosslinking product and silicone oil; the crosslinking product is obtained by crosslinking and curing of vinyl siloxane and siloxane containing a silicon-hydrogen bond under a platinum catalyst. The anti-icing conductor wire has excellent anti-icing effect and can supplement the silicone oil to prolong the anti-icing period; the anti-icing conductor wire can be directly prepared and then put into actual line use, or the anti-icing layer can be compounded on an existing power transmission conductor wire line to obtain the anti-icing conductor wire.

This invention provides a supported noble metal catalyst, its preparation method, and its application, belonging to the field of industrial flue gas catalytic purification technology. The supported noble metal catalyst provided by this invention includes a cordierite support and a platinum catalyst bonded to the surface and pores of the cordierite support by a binder. The platinum catalyst includes a support and an active component and an active agent supported on the surface of the support. The active component is elemental Pt and Pt oxides; the active agent is one or more of tungsten oxide, molybdenum oxide, and vanadium oxide. The supported noble metal catalyst provided by this invention exhibits excellent sulfur and water resistance, is not easily deactivated, and has high catalytic efficiency.

The application discloses an enhanced polytetrafluoroethylene composite framework structure composite material and a preparation method thereof. The material is composed of polysulfone modified polytetrafluoroethylene resin, carbon fiber, molybdenum disulfide, a reactive silicone resin precursor and a platinum catalyst, a continuous three-dimensional siloxane network is constructed in situ at the interface through a silicon hydrogen addition cross-linking, and a multi-scale reinforced framework structure is formed in cooperation with the carbon fiber. The material has excellent mechanical properties, creep resistance and wear resistance, and is suitable for high-performance sealing and wear-resistant fields.

Novel compositions and systems for closure of wounds with antimicrobial effectiveness are disclosed. The compositions provide devices of improved flexibility and elasticity and are readily applied to wound sites or over wound closure devices. The present invention is also directed to a novel platinum catalyst for use in such compositions. The catalyst provides for rapid curing on topical surfaces such as skin and bonds to such surfaces in about 2 -5 minutes.

The application provides an LED encapsulating glue, a preparation method thereof and application of the LED encapsulating glue in multi-chip packaging, which comprises A component and B component; the preparation raw material of the A component comprises methyl vinyl phenyl silicone oil, methyl phenyl vinyl silicone resin and methyl phenyl silicone crosslinking agent; the phenyl molar content in the methyl vinyl phenyl silicone oil is 30-40%; the M:T link ratio in the methyl phenyl vinyl silicone resin is 0.75-1.0, and the phenyl molar content is 30-40%; the Si-H / Vi molar ratio in the methyl phenyl silicone crosslinking agent is 0.95:1.2; the B component comprises a platinum catalyst, a light stabilizer and an adhesion promoter. By controlling the phenyl molar content in the methyl vinyl phenyl silicone oil and the methyl phenyl vinyl silicone resin and the Si-H / Vi molar ratio of the crosslinking agent, the refractive index and the light transmittance of the encapsulating glue are both high; the encapsulating glue has specific long service life, high adhesion and is suitable for COB large-scale packaging.

This invention discloses a flap support material for cochlear implantation surgery and its preparation method, relating to the field of medical polymer materials technology. The material comprises the following components by weight: 80 parts matrix phase, 8-10 parts hydrogen-containing silicone oil, 0.2-0.4 parts platinum catalyst, 18-28 parts bioactive filler phase, 5-8 parts core-shell methyl methacrylate-butadiene-styrene terpolymer, 0.3-0.5 parts coupling agent, 3-5 parts vinyl β-cyclodextrin quaternary ammonium salt, 0.3-0.5 parts sodium heparin, 0.5-0.8 parts sodium alginate, 0.3-0.8 parts functional additives, and 1-2 parts crosslinking agent. This material exhibits good biocompatibility, excellent mechanical properties, and good aging resistance.

The present application relates to fuel cell application technical field, especially to a kind of branched type ionomer based on porphyrin and its preparation method and as binder application.The preparation method includes the following steps: S1) by superacid catalytic polymerization reaction preparation porphyrin branched type polymer main chain;The monomer of the polymerization reaction includes porphyrin monomer, aromatic compound monomer and ketone monomer;S2) above-mentioned porphyrin branched type polymer main chain is sequentially deprotonated, quaternized, to obtain branched type ionomer based on porphyrin.The present application provides a series of branched type polymers based on porphyrin, introduce different molar quantities of porphyrin in polymer main chain, the polymer can be used as binder in fuel cell, the structure of polymer with porphyrin is conducive to the transmission of substance.And, using the interaction between porphyrin and platinum makes platinum catalyst better dispersion, improves the utilization of catalyst.

This invention belongs to the field of mold release agent technology, and provides a mold release agent and its preparation method. The mold release agent of this invention comprises the following components by weight percentage: 15-25% hyperbranched polyamide-modified polysiloxane, 3-8% hydrophobic cellulose nanofibers, 10-15% microcapsules, 1-3% emulsifier, and water to 100%. The preparation method of the hyperbranched polyamide-modified polysiloxane includes the following steps: condensing hyperbranched polyamide and 3-hydroxyphenylphosphopropionic acid to obtain a first intermediate; substituting the first intermediate with alkyllithium to obtain a second intermediate; and silanizing the second intermediate, polysiloxane, and platinum catalyst to obtain the hyperbranched polyamide-modified polysiloxane. The mold release agent of this invention can mitigate silicon migration pollution; it is also an all-aqueous system with low VOC emissions, making it more environmentally friendly.

The application discloses a high-strength, optical-grade transparent dealcoholized silicone sealant and a preparation method thereof. The dealcoholized silicone sealant comprises the following raw materials in parts by mass: 100 parts of vinyl-terminated polydimethylsiloxane, 30-50 parts of vinyl MQ silicone resin, 12-15 parts of single-end hydrogen-containing trimethoxyl polydimethylsiloxane, 0.06-0.18 parts of platinum catalyst, 5-10 parts of dimethyl silicone oil, 3-10 parts of crosslinking agent, 2-5 parts of coupling agent and 0.5-1.5 parts of organic tin catalyst. The dealcoholized silicone sealant prepared by the application has excellent mechanical properties and optical-grade light transmittance and is cured at normal temperature.