858 results about "Isocyanic acid" patented technology

A method is provided for producing ammonia (NH₃) and introducing the produced ammonia (NH₃) into an exhaust gas stream as a reduction means for selectively catalytically reducing nitrogen oxides contained in the exhaust gas stream, which is an exhaust stream generated by the combustion process of a motor, a gas turbine, or a burner. The method comprises feeding dry urea from a supply container in a controlled amount to reactor and subjecting the dry urea in the reactor to a sufficiently rapid thermal treatment such that a gas mixture comprising the reaction products of ammonia (NH₃) and isocyanic acid (HCNO) is created. Also, the method comprises immediately catalytically treating the thus produced gas mixture in the presence of water such that the isocyanic acid (HCNO) resulting from the rapid thermal treatment is converted, via quantitative hydrolysis treatment, into ammonia (NH₃) and carbon dioxide (CO₂).

The present invention relates to a process for preparing organyloxysilyl-terminated polymers which have increased stability toward atmospheric moisture, by reacting hydroxy-terminated organic polymers with isocyanato-functional silanes in the presence of at least one catalyst selected from the group consisting of bismuth and zinc compounds, and to crosslinkable compositions comprising such polymers.

The present invention relates to aqueous polyurethane dispersions that are free from N-methylpyrrolidone and other solvents and wherein the polyurethanes are the reaction products of A) a mixture of 25% to 90% by weight of 1-isocyanate-3,3,5,-trimethyl-5-isocyanatomethylcyclohexane (IPDI) and 10% to 75% by weight of 4,4′-diisocyanatodicyclohexylmethane, wherein the preceding percentages are based on the weight of component A), with B) one or more polyols having average molarcular weights (Mn) of 500 to 6000, C) one or more compounds which have at least one OH— or NH-functional group and contain a carboxyl and/or carboxylate group, wherein at least 50 mol % of the acid groups, based on the total moles of acid incorporated into the polyurethane, are incorporated by dimethylolpropionic acid, D) one or more polyols and/or polyamines having average molecular weights (Mn) of below 500, and E) optionally one or more monoalcohols and/or monoamines. The present invention also relates to a process for preparing the aqueous polyurethane dispersions and to the use of the polyurethane dispersions for preparing coatings or adhesives.

The invention relates to a polyurethane-material polishing pad and a preparation method thereof. By adoption of the polyurethane-material polishing pad and the preparation method, the problems of high energy consumption, long period, high production cost and poor degradability in the existing process are solved. The polyurethane-material polishing pad comprises a polishing layer, a buffering layer and a transparent bottom pad, wherein the polishing layer is formed by mixing, forming and curing isocyanic acid radical ion end-blocking energy-saving prepolymer A, polyatomic alcohol B, a curing agent C and hollow polymer microspheres D; the mixing ratio of the isocyanic acid radical ion end-blocking energy-saving prepolymer A to the polyatomic alcohol B to the curing agent C to the hollow polymer microspheres D is (5-100):(5-100):(5-50):(0.15-10); the shore hardness of the polishing layer is 41D-90D, the density is 0.7-1.2g/ml, and the elongation at break is 50-200%. The polyurethane-material polishing pad and the preparation method have the advantages of simple process, low production cost and manufacturing cost, low energy consumption, short production period, fast degradation speed and environmental-friendly effect.

The invention belongs to the field of cleaning of the tail gas of a diesel engine, and particularly relates to a sectional type ammonia generating device for discomposing solid urea, wherein the device can be used for treating the tail gas of a motor vehicle. The device consists of an ammonia reaction tank, an urea pyrolysis catalysis device and an isocyanic acid hydrolysis catalysis device, which are sequentially arranged in the ammonia reaction tank according to an airflow direction; the front end of the ammonia reaction tank is provided with an urea inlet, the back end of the ammonia reaction tank is provided with an ammonia outlet, and a steam transporting conduit is arranged nearby the urea inlet; the urea pyrolysis catalysis device is formed by a multi-layer wire mesh carrier which is coated with a glass coating layer SiO2-Al2O3 and loaded with a urea pyrolysis catalyst Pt, Ag or Pd; and the isocyanic acid hydrolysis catalysis device is formed by a metal honeycomb carrier coated with the isocyanic acid hydrolysis catalyst SiO2-Al2O3. Due to the urea pyrolysis catalyst and the isocyanic acid hydrolysis catalyst, the device is used for catalyzing each stage of ammonia generation by ammonia, so that the reaction temperature can be reduced, the reaction can be accelerated, and the energy can be saved.

The invention discloses a double-component organic silicon polyurethane elastomer. The double-component organic silicon polyurethane elastomer consists of a component A and a component B, wherein the mass ratio of isothiocyano in the component A to hydroxyl in the component B is 1:(1.05-1.2); the component A is prepared by reacting the following raw materials in part by mass: 10 to 30 parts of polyisocyanate, 30 to 80 parts of polyalcohol, 0.1 to 10 parts of active hydrogen-containing siloxane and 0 to 10 parts of plasticizing agent; and the component B consists of the following raw materialsin part by mass: 10 to 50 parts of polyalcohol, 1 to 10 parts of reinforcing agent, 20 to 60 parts of inorganic filler, 3 to 10 parts of pigment, 0.1 to 10 parts of aid and 5 to 20 parts of plasticizing agent. The double-component organic silicon polyurethane elastomer has high elasticity, hardness, solvent resistance, wear resistance, flexure resistance, high and low temperature resistance, ultraviolet resistance and oxidative degradation resistance, low surface energy and high hydrophobicity, and can meet the long-term using requirement of the sport field.

A synthetic method of phosphate modified urethane acrylate comprises the steps of adopting POCl3 and long chain diol to synthesize hydroxyl terminated polymer, using the hydroxyl terminated polymer and excessive diisocyanate to synthesize an isocyanato terminated polymer, and finally grafting the isocyanato terminated polymer by hydroxyl acrylate to generate the phosphate modified urethane acrylate. As the phosphate modified urethane acrylate synthesized by the method in the invention has big functionality and low viscosity, the phosphate modified urethane acrylate can be used in ultraviolet-cured adhesives and is capable of reducing dosage of a reactive diluent and improving the mechanical properties of cured film. The light-cured glue film has excellent flexibility, adhesion force and bonding strength, and can be widely applied to glass and metal base materials for improving the mechanical properties thereof such as the adhesion force and the like.

The invention discloses a method for preparing a high-performance single-component polyurethane waterproof coating. A one-step method is adopted in the method for preparing the waterproof coating, namely the waterproof coating is synthesized in one step by adding raw materials into a kettle body according to a proportion. Different from the preparation of the traditional double-component waterproof coating, the method has simple production operation, meanwhile, saves the operations of metering, mixing, stirring and the like in construction and greatly improves the construction efficiency and the safety of construction personnel. The invention adopts the technical scheme that: the waterproof coating comprises 20 to 40 percent of polyether, 15 to 35 percent of isocyanic acid, 10 to 30 percent of plasticizer, 15 to 30 percent of filler, 0.2 to 4 percent of water removing agent, 0.05 to 1 percent of silane coupling agent, 0.1 to 1 percent of ultraviolet resisting agent, 0.1 to 0.5 percent of synthesis catalyst, 0 to 10 percent of reinforcing agent and 1 to 3 percent of defoaming agent. By adopting the technical scheme and the process, the waterproof coating has excellent flexibility, high strength, ultraviolet ageing resistance and the like.

The invention relates to a highly hydrophobic antistatic composite coating and a preparation method thereof. The hydrophobicity of a conventional hydrophobic material is improved mainly by adding fluorine-containing substances. The preparation method comprises the following steps: adding graphite powder and sodium nitrate into concentrated sulfuric acid, stirring in an ice bath, adding potassium permanganate, slowly dropwise adding distilled water, removing excessive potassium permanganate, filtering sulfate ions to obtain oxidized graphite, adding the oxidized graphite into an organic solvent, and ultrasonically processing to prepare an oxidized graphene solution; adding isocyanic acid, a long-chain modified substance and a reducer into the oxidized graphene solution in sequence to chemically modify oxidized graphene, washing and drying to obtain modified graphene; by taking resin as a base body, uniformly dispersing the resin and the modified graphene through ultrasonic blending or quick stirring to obtain the highly hydrophobic antistatic composite coating. The composite coating provided by the invention has hydrophobic and antistatic performances, does not contain the fluorine-containing substances, and is environment-friendly and excellent in durability.

A novel macromer or mixture thereof is described herein, comprising benzoyl isocyanate terminal moieties and at least two residues of a water-soluble polymer having a molecular weight ranging from 80 to 10,000 adjacent to the carbonyl group of the benzoyl isocyanate moieties, thereby forming at least two ester linkages in the macromer or mixture thereof. A method for making a polyisocyanate macromer is also described herein.

The invention relates to a polyurethane acrylic acid ester and a preparation method thereof, the application in the preparation of light/moisture double solidification shape-preserving paint and a light/moisture double solidification shape-preserving paint. The polyurethane acrylic acid ester of the present invention is a polyurethane with isocyanic acid group and (methyl) acrylic acid ester. The molecular chain of the polyurethane has isocyanic acid group except for (methyl) acrylic acid ester double bond. When illumination, the C-C double bonds of (methyl) acrylic acid ester undergo free radical polymerization under the photoinitiator effect for paint crosslinking solidification.

An anti-corrosion composite layer includes a first anti-corrosion coating coated on a substrate, and a second anti-corrosion coating coated on the first anti-corrosion coating. The first anti-corrosion layer includes a plurality of first graphene nanosheets and a first carrier resin, wherein a surface of each the first graphene nanosheet has a first lipophilic functional group for chemically bonding to the first carrier resin, the first lipophilic functional group is selected from carboxyl, epoxy and amino. The second anti-corrosion coating includes a plurality of second graphene nanosheets and a second carrier resin, wherein a surface of each the second graphene nanosheet has a second lipophilic functional group for chemically bonding to the second carrier resin, the second lipophilic functional group is selected from hydroxyl and isocyanic acid group.

The invention discloses a making method of Al2O3/BN composite powder conductive fill of heat conductive adhesive, which comprises the following steps: (1) making BN clad nanometer alumina powder through gel-sol method; (2) grafting to modify the powder through multi-functional compound with isocyanic acid group. The invetnio is compatible with epoxide resin to bind and pack electronic device, which possesses excellent radiation effect.

The invention relates to a polyurethane material with protein adsorption resistance and cell adhesion resistance and a preparing method thereof. The material comprises a substrate and a modification layer. The substrate is made of polyurethane. The modification layer is obtained by polymerizing a vinyl pyrrolidone monomer on the surface of the substrate by utilization of an atom transfer radical polymerization technology. The material is prepared by steps of: subjecting the polyurethane to isocyanic acid esterification, performing amination, fixing a bromine initiator, and initiating graft polymerization of the vinyl pyrrolidone on the surface of the material. The surface of the polyurethane material prepared by the method has good hydrophilicity, good resistance to bovine serum fibrinogen adsorption, bovine serum albumin adsorption and lysozyme adsorption, and a function of resisting cell adhesion of mouse fibroblast cells (L-929), so that the polyurethane material is suitable for preparing biomedical catheter materials with complex shape structures.

The invention discloses a synthesis method of a rare-earth polyurethane high-polymer composite luminescent material, which comprises the following steps: after modifying a hydroxy-containing carboxylic acid organic ligand by a chemical method, and introducing rare-earth ions by a sol-gel method to obtain a binary rare-earth carboxylic acid hybrid material; and by using free hydroxy group in the hybrid material as active group and dibutyltin dilaurate (T12) as a catalyst, reacting with an organic substance diphenylmethane diisocyanate or toluene-2,4-diisocyanate with active group (isocyanate) to implement combination by a covalent bond, thereby obtaining the bonded rare-earth polyurethane high-polymer composite luminescent material which has the advantages of long fluorescence lifetime, high luminescent quantum efficiency and high heat stability. The preparation method of the rare-earth polyurethane high-polymer composite luminescent material has the characteristics of simple technique, mild reaction conditions, no need of any additive, low production cost and the like.

The invention discloses a polyurethane coated controlled-release fertilizer, a preparation method thereof and a special coating material. The coating material comprises modified isocyanate, polyalcohol and additive, wherein the mole ratio between hydroxyl (OH) in the polyalcohol and isocyanic acid radical (NCO) in the modified isocyanate is 1: 0.8-2.0; the polyalcohol is alcohol containing 2-6 hydroxies and has the molecular weight of 60-3000Da; and the additive is lubricating agent and/or toughening agent, and the adding quantity of the additive is 0.1%-20% of the mass of the modified isocyanate and the polyalcohol. The coated controlled-release fertilizer consists of a core and a core film, wherein the core is granular fertilizer, the core film is made of the coating material, and the mass of the core film is 1.0-10% of the mass of the core. The polyurethane coating prepared by the coating material can enhance the elasticity and the toughness of a polyurethane film layer and correspondingly improve the mechanical damage resistance performance of the coated fertilizer.

The invention discloses a preparation method and application of a PTFE and polyester-based composite film for preventing wind turbine blades from icing. The method includes the steps that a bonding composite agent is adopted for lamination complexing, an interface adhesive is applied, and a pressure-sensitive adhesive is adopted for photo-initiated pressure-sensitive adhesive application. The bonding complexing agent is prepared from 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate, vinyl acetate, ethyl carbamate, alpha-linolenic acid, benzoyl peroxide and (4)ethoxylated bisphenol A dimethacrylate; the photo-initiated pressure-sensitive adhesive is prepared from a poly[butyl acrylate-glycidyl methacrylate-n-butoxy methacrylamide]copolymer, butyl acrylate, (4)ethoxylated bisphenol A dimethacrylate, 4,4'-bis(diethylamino)benzophenone and dimethylformamide. The method and the composite film solve the non-adhesion technical problem that a PTFE film can not be pasted on the surfaces of wind turbine blades with an adhesive directly, the bonding peel strength is improved, and the composite film is suitable for wind turbine blades of various models.