113 results about "Ptru catalyst" patented technology

The present invention provides a preparation method for a light-heat dual-cured woodware UV varnish coating. The method comprises: uniformly mixing an acrylic acid monomer, a catalyst and a polymerization inhibitor; adding the resulting mixture to epoxy resin with a temperature of 90-120 DEG C to carry out a reaction at a certain temperature; adopting acid value detecting to monitor the extent of the reaction, wherein the epoxy acrylate (EA) is obtained when the acid value is reduced to less than 5 mg/g; adding a thermal initiator, a photoinitiator, an antifoaming agent, a wetting and dispersing agent, a thickening agent and a leveling agents to the EA, then mixing and stirring to obtain the UV varnish coating. The prepared UV varnish coating through the method provided by the present invention has the dual functions of light curing and heat curing, the surface dry can be rapidly achieved in 4-8 seconds under the light intensity of 250-400 mJ/cm<2>, the film forming and the curing can be achieved in 1-5 hours at the temperature of 50-70 DEG C. In addition, the prepared UV varnish coating has characteristics of high adhesion, good chemical corrosion resistance, high film hardness and low cost, and provides more excellent construction performance, curing method and film performance than ordinary UV-cured coatings.

The invention discloses a continuous preparation technology of high-purity low-viscosity dimethicone. The continuous preparation technology comprises the following steps that 1, a mixture of methylcyclosiloxane and an end-capping reagent is orderly subjected to liquid nitrogen freezing dehydration and deep dehydration until the water content of the mixture is less than 300ppb; 2, the treated mixture is subjected to adsorption filtration, nanofiltration membrane filtration and pre-heating, then is fed into a fluidized bed with a catalyst and undergoes a catalytic reaction; and 3, reaction products are subjected to adsorption filtration, nanofiltration membrane filtration and a low-boiling-point substance removal process so that a low-boiling-point substance is removed and the high-purity low-viscosity dimethicone is obtained. The high-purity low-viscosity dimethicone obtained by the continuous preparation technology has the advantages of low ion content, low hydroxyl content and low solid content. The continuous preparation technology has a raw material utilization rate of 100%, realizes zero discharge, is an environmentally friendly green technology and is suitable for low-viscosity dimethicone production.

The invention discloses spherical polybutylene-1 with high isotacticity and a preparation method thereof as well as a catalyst used by the method. The method comprises the following steps: catalyzing the polymerization of a butene-1 monomer body to polymerize by using a loaded ziegler-giulio natta spherical catalyst system, wherein hydrogen is a molecular weight adjustor; adding an electron donor compound; implementing temperature-gradient polymerization in a temperature range from -10 DEG C to 50 DEG C, wherein polybutylene-1 suspends in the reaction system in form of spherical particles; and flashing to recover unpolymerized monomers to obtain spherical polybutylene-1. Spherical polybutylene-1 with high isotacticity can be obtained by adjusting the partial pressures of the electron donor and hydrogen, wherein the isotacticity is greater than 95%, the isotacticity is greater than 0.30g/cm<3> and the isotacticity is 0.1-30g/10min. The catalyst used in the method consists of a carrier, an active component, the electron donor and a promoter.

According to the invention, the porous carbon-coated nano zero-valent iron composite catalyst is prepared by taking a metal skeleton as a precursor, and has excellent catalytic performance in an electro-Fenton process. The synthesis method has the advantages of simplicity and convenience in operation, low equipment requirement, good product performance reproducibility and the like. Due to the synergistic effect of iron and carbon, electron transfer is accelerated, and the catalytic efficiency is remarkably improved. The iron-carbon material has strong magnetism, can be quickly separated in a magnetic field, and is convenient to recover.

A method for forming an ultrathin-wall porous metal pipe fitting belongs to the field of powder metallurgy production and includes the steps: firstly, adding monomers and crosslinking agents into organic solvents or deionized water according to the volume ratio of 1-120:1 to prepare pre-mixed liquor with the concentration of 5-50wt%; secondly, mixing metal powder and pore-forming agents with the prepared pre-mixed liquor of a stable gel system, adding dispersing agents accounting for 0.05-5wt% of the mass of metal powder, adjusting pH (potential of hydrogen) and stirring or ball-milling the mixture for 2-10h to prepare suspending slurry with fine flowability; thirdly, adding 0.1-3.5wt% of catalysts and initiating agents, evenly stirring the mixture, filling the mixture into a large-size mould in a complicated shape after vacuum degassing, demoulding after solidifying the mixture for 30s-30min at the temperature of 30-90 DEG C, and drying a blank in vacuum or protective atmosphere; and finally sintering the blank into a pair. The method can be used for preparing the ultrathin-wall porous metal pipe fitting, so that the problem of easiness of breakage in pressure forming is avoided. By adjusting the content and the granularity of the pore-forming agents, the porosity and the pore size of the part are controlled, and the method is simple in process and low in production cost.

The invention discloses a trivalent copper catalyst and a preparation method thereof and application to hydrochlorination of acetylene. The preparation method of the trivalent copper catalyst comprises the steps that a nitrogen-containing heterocyclic compound and copper salt are added into a trichloromethane solution to mix to obtain a mixed solution A containing a bivalent copper compound; ionicliquid is added into the obtained mixed solution A, and under the action of an oxidant, a mixed solution B containing a trivalent copper compound is obtained; and a porous solid carrier is immersed in the obtained mixed solution B containing the trivalent copper compound for 0.5-5 h, then the treated solid is taken out, and heated and dried under the condition of blue light irradiation, and the trivalent copper catalyst is obtained. The trivalent copper catalyst is used for the reaction of acetylene hydrochlorination to prepare vinyl chloride. The trivalent copper catalyst is prepared by simple operation steps, the stability and activity of the catalyst are improved, the production cost is lowered, and good application prospect is achieved.

The invention discloses a preparation method of large-molecular weight perfluoropolyether acyl fluoride by negative-ion ring opening polymerization of hexafluoropropylene oxide. The negative-ion ring opening polymerization is carried out on hexafluoropropylene oxide to obtain the acyl fluoride of which the structural formula is CF3CF2 (CF2OCF (CF3)) nCOF under the condition of the composite catalyst which consists of a fluoride-containing organic solvent, alkali metal fluoride and polybasic ether, wherein the average molecular weight of the acyl fluoride is greater than 2000, molecular weight distribution is narrow, and the structure of the acyl fluoride can be converted into the structure of which the tail end is -OH, -COOH and -NH2 due to the activity of the acyl fluoride, so that the technology can be further used for the synthesis of polyester resin, epoxy resin and the like.

The invention discloses water-based alkyd-acrylate dispersion as well as a preparation method and application thereof. The water-based alkyd-acrylate dispersion is prepared from the following raw materials: alkyd resin, an acrylate monomer, texanol, an initiator and a neutralizer, wherein the alkyd resin comprises the following raw materials: rosin, vegetable oil, polyol, phthalic anhydride, maleic anhydride, trimellitic anhydride, D40 solvent oil, an alcoholysis catalyst, an esterification catalyst and texanol. The water-based alkyd-acrylate dispersion is prepared from the raw materials through a chemical copolymerization method; wherein the particle size of the nano titanium dioxide is 178-188 nm, the Mw/Mn is 2.93 to 2.96, the grafting rate is 51-57%, the particle size is small and uniform, the stability is better, the grafting rate is high and the molecular weight distribution is more uniform; a molecular chain contains conjugated double bonds, carboxyl and other functional groups,so that the crosslinking density can be improved, the water absorption rate of a paint film is reduced, and the hardness, adhesive force, salt fog resistance and other properties of the paint film are improved.

The invention provides an ammonia oxidation catalyst as well as a preparation method and application thereof. The ammoxidation catalyst comprises a carrier and an active component, wherein the activecomponent meets the following structure in terms of atomic ratio: V1.0AgaAsbDcEdGeOx, wherein the D is selected from one or more of Mn, Zn, Ca, Ba and Pb, the E is selected from one or more of Cs, Zr,La, Ce and Pr, and the G is selected from one or more of Rh, Ru, Ir, Pt and Au; a is equal to 0.01-3, b is equal to 0.01-3, c is equal to 0.01-2, d is equal to 0.001-1, e is equal to 0.001-0.6, b/(1+a) is more than 0.3 and less than 1.2, and (b+e)/(c+d) is more than 0.1 and less than 15; x is determined by the oxidation degree of other elements shown in the formula I. The catalyst is high in conversion rate and selectivity, good in stability and suitable for industrial production during low-ammonia/xylene-ratio feeding.

The invention discloses a fuel cell with a cathode flow channel flow distribution design and catalyst layer Pt content gradient distribution. The fuel cell sequentially comprises an anode collector plate, an anode diffusion layer, a membrane electrode with gradient platinum content, a cathode diffusion layer and a cathode collector plate, and is characterized in that the cathode collector plate forming a cathode module of the fuel cell is provided with a main air inlet and at least one flow distribution air inlet so as to introduce air with different flow rates, and the catalyst concentrationof a cathode catalyst layer of the membrane electrode with the gradient platinum content is increased in a gradient manner from the air inlet to the air outlet. The catalyst layer of the membrane electrode fuel cell with the gradient platinum content adopts gradient distribution, so that gas at the outlet of the cell completely reacts, and the effects of uniformly utilizing an active region and reducing the production cost are achieved; by adopting the flow distribution gas inlet, the distribution of the gas in the battery is changed, the diffusion mass transfer of the gas in the cathode sidediffusion layer is improved, and the effect of improving the performance of the battery is achieved.

The invention provided a catalyst loaded with ionic liquid and a preparation method and application of the catalyst. According to the catalyst, the dispersion effect of metal in a carbide carrier is better, the catalytic activity is higher, the stability is better, ionic liquid is stabilized on the surface of the carrier through silicon hydroxyl, and is not prone to being loosen from the surface of the carrier, the metal is stabilized on the outer surface layer of the catalyst through the form of coordination with the ionic liquid, the influence of mass transfer is reduced, meanwhile the dispersion of the metal is increased, an external static electric filed is introduced into the preparation of the metal-based catalyst loaded with the ionic liquid for the first time, the enrichment of a metal active center on the surface layer of the ionic liquid is promoted, because the metal active center of the catalyst is distributed on the surface layer of the ionic liquid, the influence of substrate diffusion is reduced, and under the evaluated reaction conditions, the induction period of the catalyst is eliminated.

Provided is: a thermally conductive silicone gel composition which has a high thermal conductivity, and has excellent gap-filling ability and repairability; a thermally conductive member comprising the thermally conductive silicone gel composition; and a heat dissipation structure using the same. The thermally conductive silicone gel composition comprises: (A) an alkenyl group-containing organopolysiloxane; (B) a straight-chain organohydrogenpolysiloxane containing an average of 2 to 4 silicon-bonded hydrogen atoms per molecule, at least two of the hydrogen atoms are being located on a side chain of the molecular chain, wherein the amount of silicon-bonded hydrogen atoms in component (B) is 0.2 to 5 mol with respected to 1 mol of an alkenyl group contained in component (A); (C) a catalyst for hydrosilylation reaction; (D) a thermally conductive filler; and (E) an alkoxysilane having an alkyl group with 6 or more carbon atoms per molecule.

The invention relates to a honeycomb denitration catalyst with water resistance and a preparation method therefor and belongs to the flue gas denitration field. The catalyst employs titanium dioxide as a carrier and employs vanadium pentoxide as an active component, auxiliary agents of tungsten trioxide, an organic binding agent and a forming auxiliary agent are added, extrusion molding is carried out, and surface treatment is carried out by utilization of a waterproof agent. The catalyst is simple in preparation steps, the conversion rate of the active component vanadium pentoxide is high, the mechanical strength is high, and the service life is long. Solids are dispersed uniformly through the ball milling technology, the micropore structure of the catalyst is changed, and the bonding force of the waterproof agent sodium methyl silicate and the catalyst is raised. When the catalyst operates in flue gas with a low temperature (260-300 DEG C) and a high water content (the water content is more than 10%), the denitration efficiency still can reach more than 95%, the environment application range of the catalyst is widened, and the service life is 3.5-4.5 years.

The invention discloses a Ni3P/SiO2 catalyst as well as a preparation method and application thereof. The Ni3P/SiO2 catalyst is composed of a SiO2 carrier and Ni3P loaded on the SiO2 carrier, the mass percent of Ni3P in the catalyst is 10-45%, the balance is the SiO2 carrier, the particle size of Ni3P in the catalyst is 6-15 nanometers, and the specific surface area of the catalyst is 50-250 m<2>/g. Experiments show that the Ni3P/SiO2 catalyst provided by the invention is high in activity, high in selectivity and good in stability, especially has the advantages that the selectivity of methyl glycolate can still reach 85% or above under deep conversion of dimethyl oxalate (greater than 99.9%), a high-selectivity temperature window is wide and the like, and can be used as a catalyst for a reaction of preparing methyl glycolate through hydrogenation of dimethyl oxalate; and in addition, the preparation method disclosed by the invention is simple, mild in condition and easy to realize large-scale production.

Provided is an exhaust gas purification device that ensures an improved purification performance and a suppressed pressure loss. An exhaust gas purification device of the present disclosure includes a honeycomb substrate and an inflow cell side catalyst layer. disposed on a surface on the inflow cell side in an inflow side region of the partition wall. When a gas permeability coefficient of an inflow side partition wall portion including the inflow side region of the partition wall and the inflow cell side catalyst layer is Ka and a gas permeability coefficient of an outflow side partition wall portion including an outflow side region at least from the predetermined position to an outflow side end of the partition wall is Kb, a ratio Ka/Kb of the gas permeability coefficients is within a range of 0.4 or more and 0.8 or less.

The invention discloses a two-component organic silicon composition for mold top packaging and a preparation method thereof. The two-component organic silicon composition for mold top packaging comprises a component A and a component B. The component A comprises the following raw materials in parts by mass: 5-50 parts of vinyl silicone oil with a special structure, 0-45 parts of methyl vinyl MQ silicone resin and 0.05-0.5 part of a platinum catalyst. The component B is prepared from the following raw materials in parts by mass: 25 to 44 parts of methyl vinyl MQ silicon resin, 1 to 5 parts of atackifier, 4 to 18 parts of hydrogen-containing silicon resin and 0.005 to 0.05 part of an inhibitor. The two-component organic silicon composition provided by the invention has the characteristics of high strength, high hardness, high transmittance, high bonding strength, small thermal expansion coefficient, low moisture absorption, high temperature resistance, good aging resistance and the likeafter being completely cured, meanwhile, is high in curing speed, long in operation time, and good in mold release performance after mold top molding, and meets the related requirements of the packaging material for mold top packaging.