372 results about "Hydrosilylation" patented technology

The invention relates to the technical field of fibers, and discloses a high-elasticity polyurethane flame-retardant fiber, a preparation method and application of the high-elasticity polyurethane flame-retardant fiber to a telescopic electric wire. The preparation method comprises the following steps: by using 1, 1, 3, 3-tetramethyldisiloxane as a bridging agent through hydrosilylation reaction, connecting allyl modified DOPO with allyl phenoxy cyclotriphosphazene to prepare a flame retardant with three flame-retardant elements of phosphorus, nitrogen and silicon at the same time; the preparation method comprises the following steps: preparing a polyurethane urea solution by a method of adding 4, 4-diphenylmethane diisocyanate in batches, introducing a flame retardant, mixing the polyurethane urea solution with an antioxidant, a dyeing assistant and a delustering agent, and carrying out dry spinning to obtain the high-elasticity polyurethane flame-retardant fiber. The polyurethane fiber has excellent flame retardant property and heat resistance, and good mechanical property and resilience, and can be applied to telescopic electric wires.

The invention discloses conductive paste, a preparation method thereof and a radio frequency identification tag. The conductive paste comprises the following raw materials in parts by mass: 30-40 parts of spherical silver powder, 3-6 parts of carbon nanotubes, 20-30 parts of a resin adhesive, 40-50 parts of a diluent and 2-4 parts of a dispersant, the resin adhesive comprises polyurethane resin and an organosilicone modified acrylate monomer in a mass ratio of (8-9): (1-2), and the organosilicone modified acrylate monomer is obtained by hydrosilylation of a hydroxyl acrylate monomer and a hydrogen-containing silane compound in a molar ratio of (1.0-1.1): 1. According to the invention, the contradiction between the conductive performance and fluidity and the product flexibility of the conductive paste can be effectively solved, and the RFID product with high conductivity, printing quality and mechanical flexibility can be prepared.

The invention relates to the field of high polymer materials, and discloses a preparation method of high-temperature-resistant oil-resistant special functional silica gel, which comprises the following steps: adding a thermoplastic polyester elastomer, fluorosilicone rubber and a macromolecular compatilizer into an extruder through a main feeding port, and carrying out melt blending; adding hydrogen-containing silicone oil, a platinum catalyst and an internal closed type cross-linking agent through a side feeding port, and carrying out distributed blending; under the condition that the temperature is higher than the deblocking temperature of the cross-linking agent, initiating the internal closed cross-linking agent to perform physical thermal cracking shelling and release cross-linking sites, and guiding hydrosilylation reaction to perform dynamic vulcanization; and after vacuumizing and exhausting, extruding and pelletizing to obtain the silica gel. Through cooperation of a space-time decoupling distributed feeding process and a non-toxic thermal deblocking cross-linking agent, catalyst poisoning caused by early-stage high-temperature shear consumption and by-products is avoided, a cross-phase covalent interlocking network is constructed at a polyester and fluorine-silicon two-phase interface, permeation of a non-polar solvent is hindered, and therefore the performance of the fluorine-silicon copolymer is improved. The volume swelling ratio of the material is reduced; and the high-temperature aging resistance is improved.

The invention provides a single-component modified silane adhesive as well as a preparation method and application thereof. The adhesive is prepared by mixing the following components: silane modified polyether resin, silane modified polymer resin, a plasticizer, a composite light stabilizer, a filler, a rheological additive, a water removal agent, a coupling agent and a catalyst, the silane modified polyether resin is silane-terminated resin prepared by a hydrosilylation method; the silane-modified polymer resin is a silane-terminated polymer resin containing a urethane bond. The adhesive is excellent in comprehensive performance, the tensile strength of a body is larger than 3 MPa, the elongation at break is larger than 450%, the adhesive is high in adhesion universality to metal base materials, PET films, ceramics, glass, wood floors, PVC, PC, ABS, wood-plastic composite materials and paint faces, the base materials do not need to be specially treated, the damage form is cohesive failure, and the adhesive has good adhesion strength, tear resistance and excellent temperature resistance and is suitable for being applied to the field of wood products. After aging at 120 DEG C for one week, the tensile strength of the body is greater than 3 MPa, the elongation at break is greater than 430%, and the surface layer can be coated after curing.

The invention discloses a method for continuously synthesizing long-chain alkyl modified silicone oil, which belongs to the technical field of organic synthesis, and comprises the following specific steps: quickly mixing hydrogen-containing silicone oil and long-chain olefin in a micro-mixer, carrying out hydrosilylation reaction in a packed tubular reactor, controlling the reaction residence time by using the tube length, and continuously synthesizing the long-chain alkyl modified silicone oil. Controlling the material ratio by utilizing the reaction liquid flow ratio, controlling the reaction temperature by utilizing a water bath, and obtaining a mixed solution containing modified silicone oil after the reaction is completed; and decoloring the mixed solution by using activated carbon, and then carrying out reduced pressure rotary evaporation on the decolored mixed solution to finally obtain a modified silicone oil pure product. The method realizes continuous synthesis of the modified silicone oil, and has the advantages of simple process, short reaction time and high reaction safety.

The present invention is an addition-curable silicone composition containing components (A) to (C): (A) An addition reaction product of an organopolysiloxane represented by formula (1) and a compound represented by formula (2), the addition reaction product having two addition-reactive carbon-carbon double bonds per molecule. (1) (R1 is a C1-12 monovalent hydrocarbon group, R2 is a methyl group or a phenyl group, a is an integer of 0-50, and b is an integer of 0-300. ), (2) (R3 represents a C1-12 divalent hydrocarbon group.), (B) an organosilicon compound having a hydrogen atom bonded to at least two silicon atoms per molecule, and (C) a hydrosilylation reaction catalyst. Thus, provided are an addition-curable silicone composition that has high transparency and a high refractive index and yields a cured product having high strength and high elongation and a highly reliable optical semiconductor device sealed by a cured product thereof.

A curable composition comprises: at least one aliphatic carbosilane having m Si—H groups, at least one aliphatic carbosilane having n vinyl groups, and at least one hydrosilylation reaction catalyst. m is an integer greater than or equal to 2, n is an integer greater than or equal to 2, and m+n is at least 5. A cured reaction product and an electronic article including the same are also disclosed.

Provided is a curing reactive organopolysiloxane composition that forms a pressure-sensitive adhesive layer having a high shear storage elastic modulus and stress at 500% strain and having excellent adhesive strength. The organopolysiloxane composition comprises: (A) a chain organopolysiloxane having an alkenyl group; (B) an organopolysiloxane resin having 9 mol % or less of hydroxyl groups and the like, and being a mixture of (b1) an organopolysiloxane resin having a (Mw) of 4500 or more and (b2) an organopolysiloxane resin having a (Mw) of less than 4500; (C) an organohydrogenpolysiloxane; and (D) a hydrosilylation reaction catalyst. A mass ratio of a resin component to a chain siloxane component is within a range of 1.4 to 3.0 A pressure-sensitive adhesive layer obtained by curing the composition has a shear storage elastic modulus G′ at 25° C. of 3.5 MPa or more, and a stress at 500% strain of 0.25 MPa or more.

The invention discloses a preparation method of a tackifying flame-retardant organic silicon pressure-sensitive adhesive, which comprises the following steps: carrying out hydrosilylation reaction between a vinyl trimethoxy silane coupling agent and methyl hydrogen-containing silicon resin to synthesize an organic silicon tackifier MQ-ETMS, and carrying out wet modification on aluminum diethylphosphinate by using an olefinic bond-containing silane coupling agent to prepare a flame retardant K-ADP. After the prepared organic silicon tackifier and the flame retardant are introduced into an organic silicon pressure-sensitive adhesive system, the high-performance organic silicon pressure-sensitive adhesive tape is prepared through blending, coating, solvent volatilization and heating crosslinking. The synthesized tackifier is rich in methoxyl functional groups, the functional groups enhance the interaction between the organic silicon pressure-sensitive adhesive and the surface of an adhered material, and meanwhile, the olefinic bond-containing silane coupling agent is utilized to perform surface modification on the aluminum diethylphosphinate, so that the problem of dispersion of a traditional flame retardant added into the organic silicon pressure-sensitive adhesive is solved; therefore, the adhesion performance and the flame retardant property of the organic silicon pressure-sensitive adhesive are both improved.

The invention relates to the technical field of organic silicon catalysis, and discloses a hydrosilylation reaction catalyst and a preparation method thereof, the catalyst is prepared from a platinum complex catalyst solution, maleic anhydride, triphenyl borate, tetraethoxysilane, propylene carbonate and diethylene glycol dibutyl ether; the preparation method comprises the steps of solvent water removal, electronic relay adduct preassembly, active metal introduction, thermal induction aging and the like. An electron-deficient coordination center is constructed through a step-by-step process, the electron cloud density of the platinum center is reduced by utilizing the Lewis acid characteristic of triphenyl borate, and the solvent cage effect of propylene carbonate is matched, so that the high-temperature tolerance of the catalyst is improved, and the generation of platinum black is effectively inhibited; meanwhile, the solubilizing and bridging effects of diethylene glycol dibutyl ether are utilized, the compatibility problem of a high-polarity component and a non-polar silicone oil matrix is solved, and the obtained catalyst has high activity, high regioselectivity and excellent long-term storage stability.

A composition for printing a three-dimensional siloxane structure includes a siloxane monomer having at least one silane functional group, a chain transfer agent, a hydrosilylation catalyst, a radical initiator, and a photo-oxidizing agent.

Provided is a curing reactive organopolysiloxane composition that forms a pressure-sensitive adhesive layer having excellent curing properties, a wide range of designable viscoelastic properties such as storage elastic modulus (G′) and the like, and practically sufficient pressure-sensitive adhesive strength and tensile adhesive strength. The organopolysiloxane composition comprises: (A) an organopolysiloxane having an alkenyl group; (B) an organopolysiloxane resin with 9 mol % or less of hydroxyl groups or the like relative to all silicon atoms in a molecule or resin mixture thereof; (C) an organohydrogenpolysiloxane; (D) an organic silicon compound having an alkenyl group; and (E) a hydrosilylation reaction catalyst. A ratio (molar ratio) of the substance amount of SiH groups in component (C) relative to the sum of alkenyl groups in components (A), (B) and (D) is 1.0 or more.

The present invention relates to coating compositions that can be applied to the surface of a substrate to form a durable, non-stick coating. The coating compositions can include a basecoat composition and a topcoat composition for forming a basecoat and a topcoat applied over the basecoat. The basecoat can include one of an organic polymer, a sol-gel composition, and a silicone resin. The basecoat composition and the resulting basecoat can further include reinforcing particles. The topcoat can include a siloxane matrix formed from one of a hydrosilylation reaction, a dehydrocoupling reaction, and a polycondensation reaction. The basecoat and the topcoat can each be substantially free of a fluoropolymer component.

A coating composition contains the following components: (a) alkenyl-functional siloxane polymer with an average of at least two silicon-bonded alkenyl groups per molecule; (b) SiH-functional siloxane polymer containing an average of at least two SiH functionalities per molecule; (c) optionally, a non-reactive siloxane polymer; (d) hydrosilylation catalyst; (e) optionally, hydrosilylation reaction inhibitor; (f) surfactant; (g) an acid / base buffer that maintains a coating composition pH of less than 7; (h) alkyl and / or alkenyl succinic anhydride-modified starch; (i) water; (j) optionally, biocide; and (k) optionally, antifoam; where the molar ratio of SiH from component (b) to alkenyl groups from component (a) is in a range of 1.2 to 3.0.

The curable fluorosilicone composition of the present invention comprises at least: (A) an organopolysiloxane having at least two alkenyl groups and at least one fluoroalkyl group in one molecule; (B) an organopolysiloxane having at least two silicon atom-bonded hydrogen atoms and at least one fluoroalkyl group in one molecule; (C) a catalyst for platinum group metal-based hydrosilylation reaction; and (D) a hydrosilylation reaction inhibitor having an aliphatic unsaturated bond, the (C) component being a capsule-type catalyst with an acrylic resin as a wall material, the platinum group metal in the (C) component being 0.1 to 100 ppm in mass units relative to the present composition, and the molar ratio of the aliphatic unsaturated bond in the (D) component to the platinum group metal in the (C) component being 1 to 100. The present composition has good curability and a sufficient pot life at ordinary temperature.

The present disclosure relates to a silicone foam adhesive composition comprising (a) at least one polyorganosiloxane containing at least 2 silicon-bonded alkenyl groups per molecule, (b) at least one polyorganosiloxane containing at least 2 silicon-bonded hydrogen atoms per molecule, (c) a porogen capable of generating hydrogen gas in the presence of (b), comprising (c1) a polyorganosiloxane containing at least 1 silicon-bonded hydroxyl group per molecule, and (c2) water, and (d) a hydrosilylation catalyst; provided that the molar ratio of the hydroxyl groups in component (c2) to the hydroxyl groups in component (c1) is in the range of 1:5 to 20:1. The composition has a lower viscosity, a longer working time, and the cured foam has a lower density, fine and uniform cells.

Provided is a novel curable organopolysiloxane composition and the like that can be used in the production of semiconductor components and the like. A curable organopolysiloxane composition comprising: (A1) an organopolysiloxane having no curable functional group having an aliphatic unsaturated bond within the molecule, and containing at least 20 mol% or more of siloxane units represented by SiO 4 / 2 (A1-1) in the total siloxane units; (A2) an organopolysiloxane having at least one monovalent hydrocarbon group having an aliphatic unsaturated bond in one molecule; (B) an organohydrogenpolysiloxane containing at least two silicon-bonded hydrogen atoms in one molecule; (C) a first hydrosilylation catalyst that exhibits activity by irradiation of high-energy rays; and (D) a second hydrosilylation catalyst microencapsulated by a thermoplastic resin having a softening point in the temperature range of 50 to 200°C.

The application discloses a platinum complex with controllable activity and a preparation method and application thereof, which is formed by coordination of vinyl siloxane, modified ligand and chloroplatinic acid; the modified ligand is prepared by reaction of maleic anhydride, allylamine and hydroxymethyl dimethyl phosphite. The application introduces amide groups and phosphite groups into the molecular chain of maleic anhydride, uses the groups as coordination compounds to coordinate with vinyl siloxane and platinum, and can improve the normal-temperature storage stability of the platinum catalyst while still keeping high catalytic activity of the platinum catalyst on the hydrosilylation reaction; when the platinum complex is used for catalyzing preparation of addition-type liquid silicone rubber, no inhibitor needs to be added, and the silicone rubber has good mechanical properties.

The invention relates to the technical field of pesticide production, and particularly discloses a preparation process of glufosinate-ammonium intermediate 3-(methyl hydroxyl phosphonyl) propionaldehyde. The preparation method comprises the following steps: 1, carrying out addition reaction on diethyl methylphosphonite and acrylic acid in absolute ethyl alcohol to generate 3-[ethyoxyl (methyl) phosphonyl] propionate; in the second step, 3-[ethyoxyl (methyl) phosphonyl] propionate is subjected to a hydrosilylation reaction in an oriented mode, and 3-triethyl siloxy-3-ethyoxyl propyl methyl ethyl phosphonate is generated; and 3, carrying out a simple dilute acid hydrolysis reaction to obtain the 3-(methyl hydroxyl phosphonyl) propionaldehyde. According to the method, a three-step reaction route of addition-hydrosilylation-hydrolysis is adopted, and the acrylic acid is used for replacing the traditional high-toxicity raw material acrolein, so that the toxicity risk is avoided from the source, the yield of the target glufosinate-ammonium intermediate is remarkably improved, the total yield of the three-step reaction can reach 95% or above, and the method is suitable for industrial production. And an efficient and green brand-new technical scheme is provided for large-scale production of glufosinate-ammonium.

Provided is an adhesive composition for forming an adhesive layer between a support substrate and a semiconductor substrate or an electronic device substrate. The adhesive composition includes an adhesive component (A) that hardens by a hydrosilylation reaction, and the etching rate of the adhesive layer measured by a specific measurement method is 10 μm / min. or more.

The present invention is a composition comprising a) a compound functionalized with at least one Si-H group; b) a compound functionalized with at least one olefin group; and c) compound of Formula 1: where x, R1, R2, and R3 are as defined herein. The composition provides a pre-catalyst that decomposes quickly to a platinum state that promotes hydrosilylation upon irradiation with light of the appropriate wavelength.

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 invention relates to a skin-friendly sweat-permeable fabric and a preparation method thereof, and belongs to the technical field of fabrics. The fabric is composed of closely woven base cloth and a modified polyurethane coating on the surface. The modified polyurethane is formed by copolymerization of diisocyanate, dihydric alcohol, a hydrophilic chain extender and a special modified alcohol monomer, the monomer is prepared by hydrosilylation of a linear end hydrogen-containing polysiloxane oligomer and monoalkenyl alcohol, and the structure of the monomer is that two ends are alcoholic hydroxyl groups, and the middle part is connected with a short siloxane chain through a long-chain alkyl group. After the structure is embedded into a polyurethane main chain as a key unit, microphase separation is induced to be generated, a nanoscale hydrophobic microgap network is formed in the coating, efficient physical moisture permeability is achieved, and water pressure resistance is not affected; a stable and discontinuous low-surface-energy micro-area is formed on the surface of the coating, so that the fabric is dry and smooth in touch.

The present invention is a platinum (II) oxalate compound of the formula: wherein R1, R2 and R3 are as defined herein. The platinum (II) oxalate compound of the present invention can be used as a catalyst in a hydrosilylation reaction, especially in the hydrosilylation of curable siloxanes.

This invention discloses a siloxane-modified epoxy resin and its preparation method, belonging to the field of epoxy resin modification technology. By introducing Si-O bonds into the epoxy resin molecular chain through a hydrosilylation reaction of hydrogen-containing siloxane cyclic molecules, the glass transition temperature of the modified resin can be significantly increased. Simultaneously, the dense siloxane cross-linked network can block the penetration of corrosive media such as water, acids, alkalis, and salts, thus improving the service life of the resin in humid and salt spray environments. The resulting siloxane-modified epoxy resin exhibits significantly improved mechanical properties such as heat resistance, weather resistance, stability, and toughness, solving the problem of reduced resin stability and heat resistance during modification processes in existing technologies.

The invention relates to an LSPC foamed sheet and a preparation method thereof, and belongs to the technical field of foamed materials. In order to solve the problems that an existing foamed stone-plastic plate is uneven in foam hole, insufficient in strength and prone to local collapse, a novel foam regulator is introduced into a PVC-based foaming system. According to the regulator, through hydrosilylation, ring opening and silane coupling reaction, a polysiloxane-alkyl ester functional structure is grafted on the surface of nano silicon dioxide, bubbles are induced to be uniformly nucleated by utilizing low surface tension of the functional structure, and bubbles are inhibited to be aggregated through an interface adhesion energy barrier, so that a uniform and fine closed-pore structure is formed. The density of the obtained LSPC board is reduced, and the LSPC board has excellent mechanical strength and high-temperature collapse resistance and is suitable for bearing, floor heating and other scenes.

The invention belongs to the technical field of printed circuit board materials, and discloses a heat-resistant high-toughness PCB and a preparation method thereof. The preparation method comprises the following steps: carrying out hydrosilylation polymerization reaction on epoxy-terminated polybutadiene and polymethylhydrosiloxane in the presence of a catalyst and an organic solvent to obtain a polysiloxane modified epoxy-terminated polybutadiene solution, then uniformly mixing the polysiloxane modified epoxy-terminated polybutadiene solution with epoxy resin, an amino silsesquioxane curing agent and an inorganic filler, and carrying out extrusion molding to obtain the epoxy-terminated polybutadiene modified epoxy resin. A modified epoxy resin glue solution is obtained; the obtained modified epoxy resin glue solution is adopted to conduct glue dipping treatment on a non-conductive base material, then single-face or double-face copper foil coating is conducted, hot pressing curing is conducted, and a copper-coated base plate is obtained; and then cutting, drilling, copper deposition, etching and surface treatment are carried out to obtain the heat-resistant high-toughness PCB. The epoxy resin is modified by polysiloxane modified epoxy-terminated polybutadiene, so that the heat resistance and toughness of the obtained copper-clad substrate and PCB can be remarkably improved, and relatively high adhesive property can be kept.

The present invention is a temporary adhesive for wafer processing, which is used for temporarily bonding a wafer to a support. This temporary adhesive for wafer processing is composed of a curable silicone resin composition which can be cured by a hydrosilylation reaction. This curable silicone resin composition is a temporary adhesive for wafer processing, which characteristically contains an organopolysiloxane that has in each molecule only one alkenyl group or only one silicon atom-bonded hydrogen atom (SiH group). It is thereby possible to provide a temporary adhesive for wafer processing, a wafer laminate, and a method for producing thin wafers using same, which support an improved productivity for thin wafers, wherein, inter alia, an adequate substrate retention is exhibited post-bonding even when a substrate with high level differences is used; a high process compatibility is exhibited with wafer backside grinding processes, TSV formation processes, and wafer backside wiring processes; facile peeling is exhibited in peeling processes even after passage post-bonding through a lengthy high-temperature heating process in air; and the residue on the substrate post-peeling exhibits an excellent cleanability.

To provide a curable perfluoropolyether adhesive composition which gives a rubber-like or gel-like cured product adhering to a substrate.SOLUTION: The curable perfluoropolyether adhesive composition contains: (A) 100 pts.mass of a linear perfluoropolyether compound having at least two alkenyl groups in one molecule and having a perfluoropolyether structure containing a repeating unit represented by -CaF2aO- in the main chain; (B) an organosilicon compound having at least two hydrogen atoms bonded to silicon atoms in one molecule; (C) a hydrosilylation reaction catalyst; and (D) 0.05-5 pts.mass of an organosilicon compound other than the component (B), which has two or more selected from a hydrogen atom bonded to a silicon atom, an epoxy group bonded to a silicon atom via a carbon atom or both a carbon atom and an oxygen atom, and a trialkoxysilyl group bonded to a silicon atom via a carbon atom or both a carbon atom and an oxygen atom in one molecule.SELECTED DRAWING: None

A silicone elastomer composition contains the following components: (a) hydroxyl-functional polyorganosiloxane gum; (b) pendant alkenyl-functional polyorganosiloxane gum; (c) silylhydride-functional crosslinker containing an average of at least 2 SiH groups per molecule; (d) hydrosilylation catalyst; (e) hydrosilylation inhibitor; (f) solvent; (g) optionally, terminal alkenyl-functional polyorganosiloxane gum that is free of pendant alkenyl groups; and (h) optionally, tetraalkoxysilane; where: (i) the silicone elastomer composition is free of MQ resin; (ii) the weight ratio of components (a) / (b) is in a range of 0.1 to 10; (iii) the mole ratio of (SiH) / (C＝C) is in a range of one to 20; and (iv) the weight percent of alkenyl groups relative to total weight of components (a), (b) and (g) is in a range of 0.035 to 1.00.