63results about How to "Strong interfacial interaction" patented technology

The invention discloses a graphene / molecular sieve composite catalyst and a preparation method thereof. The composite catalyst comprises, by weight, 5-40% of graphene and 60-95% of molecular sieve. The composite material has a quasi-two-dimensional lamellar structure, the ratio of the area of a single lamella to the thickness of the single lamella is more than 100 micrometers, the molecular sieve is evenly loaded on the surface of the graphene, and mesopore diameter is 2-30 nanometers. The preparation method includes: mixing the graphene, a silicon source, an aluminum source and a surfactant, separating out a graphene-containing part, crystalizing, purifying, and removing the surfactant. The graphene / molecular sieve composite catalyst has the advantages that the composite catalyst serving as a solid acid catalyst has enhanced catalytic activity, product yield and reusability can be evidently increased while the catalytic activity is not lowered when the catalyst is used in CBG and EHB reaction, and accordingly the catalyst is promising in application prospect.

The invention relates to the field of new materials, particularly to a high-quality graphene / two-dimensional metal carbide crystal vertical heterostructure material and a preparation method thereof. According to the preparation method, a bimetal laminate formed by a copper foil / metal foil sheet is used as a growth substrate, graphene grows at a high temperature through catalytic cracking of a carbon source by using a CVD technology, and a two-dimensional transition metal carbide crystal grows under the graphene by increasing the temperature, or graphene and a two-dimensional transition metal carbide directly grow at a temperature of higher than the melting point of copper so as to prepare a graphene / two-dimensional metal carbide vertical heterostructure; and subsequently the copper substrate is etched off to obtain the graphene / two-dimensional metal carbide vertical heterostructure. According to the present invention, the foundation is established for the research and applications of high-quality graphene / two-dimensional metal carbide vertical heterostructure in the fields of catalysis, laser detection, transparent electric-conduction films, thermal management, two-dimensional superconductivity, high transparent Josephson junctions.

The invention discloses a modified tin fluorphosphate glass / polypropylene hybrid material and a preparing method thereof and belongs to the technical field of high polymer materials. The hybrid material comprises the following ingredients, by weight part, of 70-90 parts of modified polypropylene, 10-30 parts of modified tin fluorphosphate glass and 0.4 part of antioxidant. The modified tin fluorphosphate glass is formed by tin fluorphosphate glass, and the surface of the modified tin fluorphosphate glass is processed by silane coupling agents. The modified polypropylene is formed by polypropylene, and the polypropylene is processed by maleic anhydride in a grafting mode. By means of modifying treatment, the interaction between the tin fluorphosphate glass and the polypropylene is enhanced, the compatibility between the tin fluorphosphate glass and the polypropylene is improved, and the mechanical property of the material is improved. The preparing method for the modified tin fluorphosphate glass / polypropylene hybrid material is simple and low in cost. The modified tin fluorphosphate glass / polypropylene hybrid material can be widely applied to fields of fibers and plastics and has good application prospect.

The invention relates to a hyaluronic acid / polyacrylonitrile compound film, a method for preparing the same and application thereof. The compound film is prepared by using hyaluronic acid, glutaraldehyde and a polyacrylonitrile basal film as raw materials, wherein the mass ratio of the glutaraldehyd to the hyaluronic acid is 1-10:1, and the thickness ratio of the polyacrylonitrile basal film to the hyaluronic acid layer is 135-400:1. Particularly, the preparation method comprises the following steps of: coating acid casting solution of the glutaraldehyde-containing hyaluronic acid on the polyacrylonitrile basal film which is treated by water, alkali and acid in sequence, drying, and heating the polyacrylonitrile basal film for 0.5 to 3 hours. The preparation method has the advantages of simple method, mild conditions and low cost; and the hyaluronic acid separation layer is high in hydrophilicity, and simultaneously due to the bonding characteristics, the hyaluronic acid separation layer is closely combined with a support layer, so that the prepared hyaluronic acid / polyacrylonitrile compound film is high in stability and separation property, and can be widely applied to the film realizing the separation based on a solubility diffusion mechanism such as pervaporation.

The invention relates to a graphene / graphene analogue WS2 / bismaleimide composite material modified by cyclotriphosphazene polymer and a preparation method thereof. Firstly, WS2 is stripped into grapheme analogue WS2 by using methods of low-energy ball milling and ultrasonic, then, the grapheme analogue WS2 is added into a high-temperature high-pressure reaction kettle together with an oxidized graphite, a proper amount of hydrazine hydrate is added and a pot hydrothermal method is used to prepare the graphene / graphene analogue WS2. Then, the graphene / graphene analogue WS2, phosphonitrilic chloride trimer, and branched polyethyleneimine are used as a raw materials, triethylamine is used as an acid-binding agent, and the graphene / graphene WS2 modified by cyclotriphosphazene polymer is prepared by using an in-situ template method. Finally, the composite material is prepared by mixing the graphene / graphene WS2 modified by cyclotriphosphazene polymer, diphenylethane dimaleimide and diallylbisphenol A in a certain proportion. The prepared composite material has good interface bonding strength, and excellent mechanical property and tribology performance.

The invention discloses a reinforced type aluminum-copper-based composite friction material which is prepared by carrying out procedures of raw material mixing, hot press molding and curing, wherein the raw materials comprise the following components in parts by weight: 15-20 parts of cast aluminum alloy ZAlSi8MgBe powder, 8-10 parts of copper alloy Cu30Ni15Mn powder, 8-10 parts of silicon carbide, 6-8 parts of potassium titanate fiber, 5-6 parts of aramid fiber, 5-6 parts of zirconia, 3-4 parts of tetrapod-like zinc oxide whisker, 1-2 parts of molybdenum disulfide, 1-2 parts of barium sulfate, 1-2 parts of tungsten carbide, 1.5-2 parts of nitrile rubber and 1-2 part of nano-titanium dioxide. According to the reinforced type aluminum-copper-based composite friction material, aluminum alloy and copper alloy are adopted to replace steel in a base material, as the heat radiation of the aluminum alloy and copper alloy is greatly higher than that of ordinary steel, the heat generated from brake friction can be radiated in time, the temperature of the surface of a brake pad is reduced, the high-temperature head fading property is alleviated, and the wear rate is small; and meanwhile the experiment shows that the noise frequency is less than 450Hz, so that people cannot hear conspicuous noise in an automobile.

The invention relates to a preparation method of a modified packing ion enhanced polytetrafluoroethylene composite. A matrix of the composite is polytetrafluoroethylene; filling ions comprise tetrapod-like zinc oxide whiskers, aramid fibers, glass fibers and nano titanium dioxide; the masses of the tetrapod-like zinc oxide whiskers, the aramid fibers, the glass fibers and nano titanium dioxide account for 10-12%, 5-7%, 3-4% and 2-3% of the mass of polytetrafluoroethylene powder; the polytetrafluoroethylene powder is in 120-150 meshes; the tetrapod-like zinc oxide whiskers are 12-14 micrometers in length; the diameters of roots of the tetrapod-like zinc oxide whiskers are 3-5 micrometers; the aramid fibers are 2-2.5mm in length; each monofilament is 8-10 micrometers in diameter; the glass fibers are glass fiber powder in 120-140 meshes; and the particle size of nano titanium dioxide is 15-30nm. The modified enhanced polytetrafluoroethylene composite has the advantages of high mechanical strength, good abrasive resistance, good thermal conductivity, lower linear expansion coefficient and excellent antistatic property, the mechanical properties and thermostability of the polytetrafluoroethylene composite are improved greatly, and the application field of the composite is further extended.

The invention relates to an ABS composition and a preparation method thereof. The ABS composition is prepared from the following raw materials in parts by weight: 98-102 parts of ABS resin, 5-50 partsof mesoporous masterbatch, 10-30 parts of a flame retardant, 1-10 parts of a flexibilizer and 0.1-2 parts of a processing aid. The mesoporous masterbatch is prepared from 50-99 parts of a vinyl aromatic hydrocarbon monomer, 1-50 parts of an unsaturated nitrile monomer, 1-40 parts of a solvent, 1-30 parts of a grafted elastomer, 0.001-0.1 part of an initiator, 0.01-0.08 part of a chain transfer agent and 5-20 parts of a mesoporous material through in-situ polymerization. The ABS composition has good flame retardance and mechanical properties.

The invention relates to the field of new materials and in particular relates to a preparation method of a filler particle enhanced aluminium alloy composite material. A cast aluminium alloy ZAlSi8MgBe is selected as a matrix alloy; filler particles include tetrapod-like zinc oxide whiskers, aramid fibers, glass fibers, nano titanium dioxide and silicon carbide, wherein the weights of tetrapod-like zinc oxide whiskers, aramid fibers, glass fiber, nano titanium dioxide and silicon carbide account for 6-8%, 4-5%, 3-4%, 1-2% and 2-3% of the mass of the cast aluminium alloy ZAlSi8MgBe, respectively; and all the filler particles are modified or pre-processed, and then stirred and cast with the matrix aluminium alloy, so that the filler particle enhanced aluminium alloy composite material is obtained. The aluminium alloy composite material prepared by using the preparation method disclosed by the invention is low in weight, high in specific strength and specific rigidity, low in coefficient of thermal expansion, and excellent in thermal conductivity and abrasive resistance, and further easy to prepare and low in cost; and the enhancement phase is dispersively distributed in the matrix and has isotropy; and therefore, the composite material is suitable for various complex stress states.

The invention discloses hydrophilic waste rubber powder, high-strength composite hydrogel as well as a preparation method and application thereof. The method comprises the following steps: introducing an initiator on the surface of waste rubber powder by adopting a solvent soaking method, and then initiating hydrophilic monomer polymerization by utilizing the initiator on the surface of the waste rubber powder, so the surface of the waste rubber powder has a hydrophilic polymer chain, and the hydrophilic waste rubber powder is obtained. The high-strength waste rubber powder composite polyacrylamide hydrogel is further prepared by using the waste rubber powder with high mechanical property as a reinforcing and toughening filler, and a hydrogel matrix and the waste rubber powder have strong physical entanglement interaction. The prepared high-strength composite hydrogel is expected to be used as an oil and gas field water shutoff agent.