46results about How to "Improve surface chemistry" patented technology

Provided herein is a composite, comprising: a polymer host selected from the group consisting of low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), and polypropylene (PP), polyurethane, polycaprolactone (PCL), polydimethylsiloxane (PDMS), polymethylmethacrylate (PMMA), and polyoxymethylene (POM); and a guest molecule comprising hyaluronic acid; wherein the guest molecule is disposed within the polymer host, and wherein the guest molecule is covalently bonded to at least one other guest molecule. Also provided herein are methods for forming the composite, and blood-contracting devices made from the composite, such as heart valves and vascular grafts.

The invention relates to the technical field of air filtering, in particular to a graphene material coating and a preparing method thereof, and further relates to an a air filtering device and system based on the graphene material coating. The preparing method of the graphene material coating includes the following steps that S1, slurry-dispersion raw liquid is prepared, wherein a dispersing agent and a bonding agent are added into a solvent, and the mixture is stirred to generate the slurry-dispersion raw liquid; S2, a graphene surface coating is formed, wherein graphene powder is added into the slurry-dispersion raw liquid, the mixture is stirred to allow slurry to be even to be applied to the surface of a carrier, drying is carried out, and the graphene-material-coating finished product is obtained. By means of the graphene material coating and the preparing method thereof, the adsorption rate of hazardous substances in gas can be increased, and secondary pollution caused by unfirm adsorption is avoided.

The invention discloses a preparation method of a hydrodemetallization catalyst. The method includes the following steps that 1, a physical pore-expanding agent I is soaked with an alkali-containing metal element solution I and hydrogenation active component soaking liquid I, a physical pore-expanding agent II is soaked with an alkali-containing metal element solution II and hydrogenation active component soaking liquid II, and the physical pore-expanding agent I and the physical pore-expanding agent II are dried and then soaked with an ammonium salt solution in a spraying mode for use; 2, the physical pore-expanding agent I and the physical pore-expanding agent II obtained in the step 1 are mixed with dry pseudo-boehmite gel powder, a chemical pore-expanding agent, an extrusion aid and a peptizing agent, the mixture is kneaded into plastic, strip extrusion is carried out, a formed material is subjected to heat treatment, the treated material is dried and roasted, and a modified alumina supporter is obtained; 3, the modified alumina supporter is soaked with hydrogenation active component soaking liquid III, and the catalyst is obtained through drying and roasting. The catalyst prepared through the method has a high active metal content at macropores and a low active metal content at micropores, the acid property at macropores is obviously improved, and the anti-carbon capacity of macropores is improved.

The invention discloses three-dimensionalgraphene composite aerogel. High-molecular material nano fiber with a biomass polysaccharide structure is compounded with oxidized graphene through a surface electrostatic-force effect, and then the composite aerogelis prepared by utilizing hydrazine hydrate reduction and a method for high-temperature pyrolysis in an inert atmosphere. The invention further discloses a preparation method of the three-dimensionalgraphene composite aerogel. The method for preparing the three-dimensionalgraphene composite aerogel is simple, easy to operate, large in specific surface area, uniform in pore size distribution and good in electrical conductivity, and the chemical reactivity is improved.

A preparation method of composite carbon nanofibers with a high specific surface area relates to the technical field of preparation of electrode materials of super capacitors, and comprises the following steps: mixing cellulose acetate and polyacrylonitrile to obtain a spinning solution; carrying out electrospinning to obtain CA/PAN precursors; pre-oxidazing the CA/PAN precursors; carrying out carbonization and actification to obtain CA/PAN activated carbon fibers; mixing the CA/PAN activated carbon fibers with acetylene black, PTFE and ethanol to obtain a mixture; putting the mixture into an oven; drying the mixture into paste; smearing the paste on nickel foam; carrying out drying and tabletting to obtain the CA/PAN composite carbon fiber electrode material. As cellulose acetate contains a large quantity of oxygen-containing groups, and has double functions of pore-forming and chemical surface modification, the hole structure, the specific capacitance and the specific surface area are greatly improved.

The invention provides a method used for detecting microcracks of glass by a molecule colorant, belonging to a real-time detection method in the technical field of optical cold working; the method comprises the steps as follows: after chunk glass is roughly machined, the chunk glass is arranged statically for several tens of hours so as to release the stress; subsequently, the surface of the chunk glass is corroded by acid, coated by the molecule colorant and arranged statically for several minutes; the colorant molecules infiltrate the interior of the microcrack passage till the bottom end by the compatibility of the glass on the aqueous solution and the scattering nature of the colorant; and the floating color on the surface of the chunk glass is washed away by water and the shape and depth of the microcrack can be clearly displayed, thus providing reliable basis for removing the microcrack. The method has the active effects that HF corrosion is used for reinforcing the chemical and mechanic performance of the glass surface, natural high-strength characteristic of the glass is partly recovered, the limits of microcrack theory detection method are overcome, the process flow is simplified, the processing time is saved, the processing cost is reduced, and the working efficiency and process quality are improved.

The invention provides an abrasive for chemical-mechanical polishing and a preparation method thereof. The abrasive is used in the field of chemical-mechanical polishing. The nano-SiO2 abrasive is diluted to the concentration lower than 10% (mass fraction) and taken as a growth matrix, the growth matrix is hydrolyzed by aluminum salt at the temperature of 80-90 DEG C, and then added with acid and aged at the temperature of 90-100 DEG C to prepare an acidic AlOOH solution. Water glass is diluted to lower than 10% to prepare active silicic acid by strong cation exchange resin. Finally, the AlOOH solution and the active silicic acid obtained are dropped into silica sol according to a particle growth method, added with a certain quantity of alkali to control the pH value ranging from 8 to 11, heated at a constant temperature and vigorously stirred, and aged for 2 hours. In the aluminum-silicon compound growing on the silicon base, the atomic ratio of aluminum and silicon can be controlled according to the ratio of the AlOOH to the active silicic acid. The abrasive obtained can expand the existing pH value range thereof, widen the application scope of the chemical-mechanical polishing, and improve the surface chemical properties.

The invention discloses a polyester composite fiber with an intelligent surface, and a preparation method and application thereof. The polyester composite fiber comprises a polyester fiber matrix andparticles covering the polyester fiber matrix, wherein the particles and the polyester fiber matrix are chemically bonded; preferably, the particles are polymer particles; more preferably, the particles are polymer particles with environmental response; thus, covering of the surface of the polyester fiber matrix with the particles can improve the hydrophilicity and hydrophobicity of the fiber andendows the fiber with certain environmental response. The preparation method comprises the following steps: preparing the polyester fiber matrix having reactive groups on the surface at first; then preparing the particles having reactive functional groups; and finally, mixing the polyester fiber matrix and the particles for a reaction so as to obtain the polyester composite fiber. The polyester composite fiber of the invention can be used for smart textiles, non-woven fabrics, porous films, composite materials and oil-water separators, preferably for smart textiles and oil-water separators.

The invention discloses a method for grafting hyperbranched aromatic polyamide to the surfaces of carbon fibers and relates to a method for grafting a polymer to the surfaces of the carbon fibers. The invention aims at solving the problem of low interface bonding strength of an existing carbon fiber composite material. The method comprises the following steps: firstly, carrying out extraction treatment on the carbon fibers; secondly, oxidizing; thirdly, carrying out reducing treatment on the carbon fibers; fourthly, carrying out silanization treatment on the carbon fibers; fifthly, preparing a mixture, and heating to obtain the carbon fibers of which the surfaces are grafted with the hyperbranched aromatic polyamide. Compared with untreated carbon fibers, the carbon fibers of which the surfaces are grafted with the hyperbranched aromatic polyamide, prepared by the method disclosed by the invention, have the advantages that the content of N is increased from original 1.11 percent of the untreated carbon fibers to 2.7 to 4 percent, and surface energy is improved by 100.5 percent or above, and the interfacial shear strength is improved by 65 percent. According to the method disclosed by the invention, the carbon fibers of which the surfaces are grafted with the hyperbranched aromatic polyamide can be obtained.

The invention relates to an improved method for producing pigment carbon black. The method comprises the following steps: heating and dehydrating raw oil, conveying the heated raw oil to a vaporizing tank through a pipeline, heating the vaporizing tank so as to vaporize the raw oil, enabling preheated combustible gas to pass through a liquid level of the raw oil in the vaporizing tank so as to mix the oil vapor with the combustible gas, conveying the mixed gas to a carbon black reactor for incomplete combustion and cracking through an oil gas header pipe to produce carbon black, cooling the carbon black and then conveying the cooled carbon black into a pelletizer for pelletizing, performing magnetic separation on the pelletized carbon black, then conveying into an oxidizing machine for performing thermal oxidation treatment, conveying the thermal oxidation-treated carbon black into a cooling tank for cooling to normal temperature, and then conveying to a carbon black storage tank for packaging and storing. The water-soluble pigment carbon black produced by adopting the method is high in volatile matters and dispersity as well as color intensity and low in pH value. The application performances of the pigment carbon black on oil ink, leather, coating, paint and the like can be greatly improved.

The invention belongs to the field of energy materials and electrochemical catalysis and energy storage, and aims to provide a boron-nitrogen-phosphorus ternary doped metal-free carbon material as well as a preparation method and application thereof. The boron-nitrogen-phosphorus ternary doped metal-free carbon material is obtained by taking a phenolic aromatic hydrocarbon compound or a derivativethereof as a carbon source, a phosphorus-containing organic matter or inorganic matter as a phosphorus source, a nitrogen-containing organic matter as a nitrogen source and a boron-containing organicmatter or inorganic matter as a boron source; after sufficient polymerization by a solvothermal method, oxidizing at a low temperature of 100-350 DEG C, and roasting at a high temperature of 600-1200DEG C under the protection of N2 atmosphere. The carbon material is wide in raw material source, and the preparation method is mature in process, is simple to operate, and is convenient for the large-scale production.

The invention discloses a carbon-coated ternary cathode material. The chemical formula of the carbon-coated ternary cathode material is LiNi<x>Co<y>Mn<z>O<2>, wherein 0.2<=x<=0.7, 0.1<=y<=0.5, 0.2<=z<=0.3, and x+y+z=1. The outer surface of the carbon-coated ternary cathode material is coated with a carbon carbon network. The invention also provides a preparation method. The carbon-coated ternary cathode material is capable of improving electrode electrical conductivity effectively, improving surface chemical properties of active materials, protecting electrodes from direct contact with electrolyte, and prolonging cycle life.

The invention relates to a method for preparing a nanocomposite compounded by MnO2, porous carbon and Fe2O3 layer upon layer. The composite is a nanocomposite of a layer-upon-layer structure with Fe2O3 being a core, porous carbon being a middle layer and MnO2 being an outer shell. First ferric slat, urea, sugar and ion liquid are used as raw materials, a monodispersed C/Fe2O3 composite is obtained through hydrothermal synthesis in one step, then the C/Fe2O3 is used as the core, potassium permanganate and manganese salt are used as raw materials, and the MnO2/C/Fe2O3 nanocomposite having the layer-upon-layer structure is obtained through hydrothermal synthesis. The composite is uniform in size, and has broad application prospects as a supercapacitor electrode material.

The invention discloses a nitric acid modified porous carbon and applications thereof. The nitric acid modified porous carbon is prepared by the following steps: taking melamine as the nitrogen sourceand calcium citrate as the carbon source; carrying out one-step hydrothermal synthesis to obtain a precursor; sintering the precursor at a high temperature to obtain N doped porous carbon; and finally subjecting N doped porous carbon to a nitration modification treatment to obtain the nitric acid modified porous carbon, which has the advantages of large specific surface area and abundant porous structure. The porous carbon can be used to adsorb aromatic hydrocarbons in liquid wax oil and the effect is good.

The invention discloses a preparation method of a heavy oil hydrodemetallization catalyst, and the method comprises the following steps: (1) pulverizing a waste hydrotreating catalyst, and roasting; (2) soaking the material obtained in the step (1) into an ammonium bicarbonate aqueous solution, carrying out sealed heat treatment, drying, soaking with a polyethylene glycol solution, and drying to obtain a pretreated material A; (3) performing high-temperature activation treatment on kaolin, then soaking into an ammonium bicarbonate aqueous solution, performing sealed heat treatment, and dryingthe material subjected to heat treatment to obtain a pretreated material B; and (4) kneading and molding pseudo-boehmite, the pretreated material A and the pretreated material B, drying and roasting the molded product to obtain a carrier, and loading a hydrogenation active component onto the carrier to obtain the catalyst. According to the method, the hydrodemetallization catalyst is prepared fromthe waste catalyst and kaolin, environmental pollution is reduced while the production cost is reduced, the content of macropores of the hydrodemetallization catalyst is appropriate, and the hydrodemetallization catalyst has high hydrodemetallization activity and hydrodesulfurization activity.

The invention discloses a nanometer water treatment system with a water quality monitoring function. The nanometer water treatment system comprises a precipitation tank, a flocculation tank, a nanometer treatment device, a water quality monitoring device, a control device and a water drainage tank, wherein the precipitation tank, the flocculation tank, the nanometer treatment device, the water quality monitoring device and the water drainage tank are sequentially communicated through water conveying pipes; the water quality monitoring device is communicated with a flocculation tank box througha water return pipe, and is electrically connected with the control device through a conducting wire; the water quality monitoring device is used for collecting the sewage data after treatment, and sending the sewage data to the control device; the control device is used for comparing the collected sewage data, and sending a sewage drainage or sewage reflux instruction to the water quality monitoring device. The nanometer water treatment system has the advantages that the nanometer treatment device is used for replacing the traditional secondary precipitation technology, and the sewage is strictly monitored by the water quality monitoring device, so that the purifying effect of finally drained water flow is good, and the treatment is thorough; the national drainage standard is completelyreached.

The invention discloses polyamide composite fibers with intelligent surfaces and a preparation method and application of the polyamide composite fibers. The polyamide composite fibers comprise a polyamide fiber matrix and particles which cover the polyamide fiber matrix, so that the roughness of the fibers can be improved by covering the surface of the fiber matrix with the particles, the hydrophobicity of the fibers is further improved, and the condition of poor dimensional stability caused by strong hygroscopicity of the polyamide fibers is improved. The preparation is carried out as follows: firstly, obtaining a polyamide fiber matrix with reactive groups on the surface; secondly, obtaining particles with reactive functional groups; and finally, mixing and reacting the polyamide fiber matrix and the particles to obtain the polyamide composite fibers. The polyamide composite fibers can be used for intelligent textiles, non-woven fabrics, porous films, composite materials and oil-water separators, and is preferably used for intelligent textiles and oil-water separators.

The invention discloses a polyolefin composite material with an intelligent surface, and a preparation method and application thereof. The polyolefin composite material comprises a polyolefin matrix and particles covering the polyolefin matrix, wherein the particles and the polyolefin matrix are chemically bonded; preferably, the particles are polymer particles; more preferably, the particles arepolymer particles with environmental response; thus, covering of the surface of the polyolefin matrix with the particles can improve the hydrophilicity and hydrophobicity of the material and endows the material with certain environmental response. The preparation method comprises the following steps: preparing the polyolefin matrix having reactive groups on the surface at first; then preparing theparticles having reactive functional groups; and finally, mixing the polyolefin matrix and the particles for a reaction so as to obtain the polyolefin composite material. The polyolefin composite material of the invention can be used for smart textiles, non-woven fabrics, porous films, waterproof gas-permeable membranes, battery diaphragms, composite materials, and switch films.

The improved method for extracting melingmycin from Nanchang streptomycete fermented liquor is mainly formed from the following steps: pretreatment process of fermented liquor, liquid-solid separation process, extracting melingmycin from residual filtrate and recovering process, pretreatment process of filter cake (mycelium), further solvent leaching of mycelium and concentration process of leaching liquor and one-step extraction process of concentrated leaching liquor. The total recovery rate of melingmycin can be up to above 85%.

The invention discloses a carbon-coated ternary positive electrode material which comprises a ternary positive electrode material, the ternary positive electrode material is LinNi1-x-yCoxMnyO2, x is more than 0 and less than 0.5, y is more than 0 and less than 0.5, and n is more than 0.9 and less than 1.5; the invention also provides a preparation method of the carbon-coated ternary positive electrode material, the method can improve the electronic conductivity of the carbon-coated layer, and the material shows excellent electrochemical performance when being used as the positive electrode material of the lithium ion battery; the carbon material has the advantages of excellent electrical conductivity, ultrahigh chemical and electrochemical stability, unique physical properties, low cost and the like, the problem of poor electrical conductivity of the carbon-coated lithium ion positive electrode material can be improved by adopting the carbon-coated lithium ion positive electrode material, the electrical conductivity of the carbon material can be effectively improved, and the electrical conductivity of the carbon-coated ternary positive electrode material is further improved; and furthermore, the electrochemical performance of the positive electrode material is improved.

The invention discloses a dewaxing liquid for an LED (light-emitting diode) manufacturing process, belongs to the field of wet electronic chemicals, and is mainly applied to semiconductor wafer manufacturing. Through optimal combination of the specific anionic surfactant, the organic solvent, the cosolvent and the latent solvent, the dewaxing liquid greatly reduces the surface tension of a system, has outstanding permeation and dispersion performance, meanwhile, has relatively strong temperature resistance, low cost and high dewaxing efficiency, can also meet process requirements at relatively low working temperature, and is suitable for industrial production. The adhesive has the advantages of high solubility to bonding wax, long service life and environment-friendly material composition, and can meet the technological requirements of LED (light-emitting diode) manufacture procedures.

The invention discloses a preparation method of a PLA modified material. The method comprises the following steps: S1, preparing the following raw materials in parts by mass: 22 to 30 parts of PLA, 22 to 26 parts of polyamide resin, 19 to 21 parts of carbon fiber, 13 to 17 parts of sodium perborate, 11 to 15 parts of montmorillonite, 12 to 14 parts of diphenylmethane diisocyanate, 9 to 14 parts of activated carbon, 9 to 14 parts of modified nano titanium dioxide, 8 to 10 parts of polyol, 6 to 10 parts of polyvinyl alcohol, 3 to 7 parts of an ultraviolet light absorber, 3-7 parts of a flame retardant, 2-6 parts of a plasticizer, 1-3 parts of an antibacterial agent and 0.5-2 parts of an initiator; and S2, adding the PLA, the polyamide resin, the montmorillonite, the diphenylmethane diisocyanate and the polyvinyl alcohol in the step S1 into an ultrasonic dispersion machine. The flame-retardant rubber has the advantages of excellent flame-retardant effect, high tensile strength and wear resistance, long service cycle and environmental friendliness.