46results about How to "Improve surface chemical activity" patented technology

The invention discloses an integral honeycomb denitration catalyst for a novel WO3 addition technology. The integral honeycomb denitration catalyst comprises, by weight, 4%-8% of WO3, 1%-1.5% of V2O5, 80.5%-90% of TiO2 and 5%-10% of adhesives, wherein the WO3 is added into precursor solution in a catalyst mixing procedure. The honeycomb denitration catalyst is prepared by extruding, drying and calcining materials, has fine chemical stability, heat stability and SO2 oxidization resistance, represents high NH3-SCR (selective catalytic reduction) catalytic activity and a wide active temperature window, has a large specific surface area, high chemical surface activity and fine catalytic effects, and can meet the requirement of flue gas denitration. Compared with the method of leading in WO3 by directly mixing TiO2-WO3 composite powder serving as a raw material, the preparation technology is simpler without relying on imported TiO2-WO3 composite powder, nationally rich titanium resources are made full use of, the cost of the catalyst is reduced, Chinese industrialization progress of the denitration catalyst can be promoted, and popularization of the flue gas denitration technology in China is promoted.

The invention discloses a charcoal-coated metal fluoride nano material with a core-shell structure, a preparation method and application of the nano material in the field of lithium ion battery positive electrodes. The nano material is of a core-shell structure; the shell layer is charcoal; the core layer is metal fluoride; the nano material has high specific capacity and good cyclic stability by being taken as the positive electrode material of a lithium ion battery. The nano material with the core-shell structure can be prepared through the processes of mixing, pyrolysis and solvent washing of a raw material metal compound and a fluorine-containing compound, has the characteristics of abundant source of raw material, simple process, low material preparation cost, high purity, wide metal choice range and the like, and facilitates large-scale production.

The invention discloses a preparation method for titanium dioxide serving as a catalyst carrier. The preparation method comprises the following steps of: dispersing metatitanic acid serving as a raw material by pulping, and adjusting until the concentration of the slurry is 12 to 26 mass percent based on titanium dioxide (TiO2); adding ammonia water into the slurry, and adjusting the pH value to be between 6.0 and 9.0; filtering and dehydrating to obtain a blocky filter cake; mechanically crushing the blocky filter cake; drying and calcining the crushed filter cake at 200 to 560 DEG C for 6 hours; and grinding the calcined material in a kiln to obtain a titanium dioxide product which serves as a denitration catalyst carrier. By the preparation method, the manufacturing cost is low, the process is simple, the prepared product has the advantages of large specific area, high surface chemical activity and high processability, and the prepared final product is high in catalytic efficiency.

The invention discloses modified basalt fiber reinforced scoria lightweight aggregate concrete and further provides a preparation method thereof. The basalt fiber surface is processed to generate changes in an interface structure and chemical components of fiber, so that chemical activity of the basalt fiber surface is improved, the basalt fiber surface can form a tightly-bonded interface structure with a cement base body, excellent mechanical property of the basalt fiber is given to play, and further performance of the basalt fiber reinforced scoria lightweight aggregate concrete is improved. Smoothness and chemical inertness of the basalt fiber surface are effectively improved, so that the problem that the basalt fiber and a cement base material are difficult to bond is solved. Meanwhile, the ingredients of the modified basalt fiber reinforced scoria lightweight aggregate concrete are chosen from green and environment-friendly resources which are rich in source and low in cost; furthermore, the obtained novel modified basalt fiber reinforced scoria lightweight aggregate concrete has very excellent compressive strength, breaking strength and freezing resistance.

The invention relates to a surface treatment agent and a preparation method and application thereof, in particular, the invention relates to a surface treatment agent, a preparation method thereof andan application in bonding a silicone rubber insulation layer to a hydroxybutyl liner layer, belonging to the technical field of bonding the insulation layer of a solid rocket motor, in particular toa technology for strengthening the interface bonding between the silicone rubber insulation layer and the hydroxybutyl liner layer. Compared with the traditional surface treatment method of silicone rubber, such as corona and plasma treatment technology, the viscosity enhancement technology adopted by the invention does not need specific equipment, is simple and convenient to operate, and the treated interface has longer applicable time.

The invention provides a method for simply and stably preparing micro-nano hollow copper, and belongs to method for preparing hollow copper. The method includes the steps that firstly, copper sulfate is dissolved in water and placed in a water bath kettle to be heated; secondly, polyvinylpyrrolidone is added to the solution and stirred; thirdly, water is added to sodium hydroxide, and a water solution of sodium hydroxide is prepared, added to the solution in the second step and stirred; fourthly, a pre-mixed hydrazine hydrate solution is added to the solution in the third step and stirred; fifthly, the water bath kettle is adjusted to the proper temperature, sepia Cu particles are generated, solid-liquid two phases containing the Cu particles are centrifuged at a high speed, Cu solid particles are acquired and washed multiple times with anhydrous alcohol and deionized water in a cross mode, and other impurities generated in the reaction process are removed; sixthly, Cu powder containing water or alcohol is placed in a vacuum drying oven to be dried, and then the high-purity Cu micro-nano particles can be acquired. The method has the advantages of being low in cost, simple in preparation process, high in purity, good in repeatability and high in surface chemical activity.

The invention discloses a carbon fiber grid, a preparation method thereof, a composite material and a preparation of the composite material. The preparation method of the carbon fiber grid comprises following steps: surface oxidation treatment, cleaning and drying treatment, preparation of a dendritic macromolecular solution, introduction of a dendritic macromolecular coating, introduction of carbon nano tubes, cleaning and drying treatment and obtaining of the nano-crystallized carbon fiber grid. The bond stress of an interface of polymer mortar and the carbon fiber grid is effectively increased, so that the mechanical property requirement in a building reinforcement project is met.

The invention discloses modified carbon fiber. The modified carbon fiber is characterized by being prepared through firstly treating carbon fiber by a Soxhlet extractor steam molecule pretreatment method, and then carrying out electrophoretic deposition of chitosan to modify the carbon fiber, wherein the steam molecules are acetone and concentrated nitric acid. (1) A novel pretreatment method, namely the Soxhlet extractor steam molecule pretreatment method is proposed, and compared with a traditional solvent soaking treatment method, the novel pretreatment method has the advantages that the damage to the bulk property of CF is reduced and uniform and effective cleaning and oxidation treatment can be carried out on the surface of the CF. (2) In the electrophoretic deposition process, the CFis modified by positively charged chitosan molecules, so that the chemical activity of the surface of the CF and the disorder degree of a graphite layer are improved, the surface roughness is improved, the interface compatibility and associativity of the CF and PA6 are improved and the moisture and heat resistance and the mechanical properties of the CF/PA6 composite materials are improved.

The invention relates to a low-temperature high-permeability soft magnetic manganese-zinc ferrite material and a preparation method thereof. The material comprises a main ingredient and trace additives, wherein the main ingredient comprises the following components in molar content: 51%-55% of ferrite, 15%-20% of zinc oxide and the balance of manganese oxide; the trace additives are selected from 100-400ppm of nanoscale TiO2 and 200-800ppm of Bi2O3 and CaCO3; and the preparation technology comprises a material weighing step, a strong mixing step, a pre-sintering step, a breaking step, a sanding step, a pulping step, a secondary spray granulation step, a pressing step and a sintering step. Compared with the prior art, the sintering method is optimized through the nanoscale TiO2; and the soft magnetic manganese-zinc ferrite material of which the high permeability ui is greater than 11,000 (25 DEG C, 10mV) and the initial permeability ui is greater than 9,000 at -10 DEG C can be produced.

The invention relates to a preparation method of a composite magnetic material for sewage treatment. The method comprises the following steps: 1, pulverizing sepiolite to a particle size of less thanor equal to 0.1mm, and then performing acid activation to obtain acid-activated sepiolite powder for later use; 2, dispersing the acid-activated sepiolite powder, obtained in the step 1, in ethylene glycol to obtain dispersion liquid, adding trivalent iron salt, divalent iron salt, hexamethylenetetramine, biochar, humic acid and an alkali solution into the dispersion liquid, then carrying out ultrasonic mixing uniformly, transferring into a high temperature and high pressure reaction kettle for carrying out a reaction for 4-12h, and then cooling to the room temperature to obtain a mixed solution; 3, enabling the mixed solution, obtained in the step 2, to stand for at least 24h, filtering and removing filtrate, and drying to obtain the sepiolite-loaded humic acid-modified ferroferric oxidecomposite magnetic material. The composite magnetic material prepared by the method has a very good treatment effect for pollutants and heavy metal ions in water, and can be widely applied to the sewage treatment.

The invention discloses a preparation method of environment-friendly surface-modified cotton fibers. The environment-friendly surface-modified cotton fibers are obtained by grafting oxidized chitosanon cotton fibers in a dilute acetic acid solution and then carrying out amidation chemical reaction on carboxyl in an oxidized chitosan grafted cotton fabric and amino of an amino-terminated hyperbranched polymer. The preparation method is simple and easy to implement, does not use a chemical cross-linking agent, is environment-friendly and friendly to the human body, the prepared amino-terminatedhyperbranched polymer on the surface of the modified cotton fabric is high in grafting rate, good in washing resistance and lasting in antibiosis, a layer of positive charges can be fixed to the surfaces of cotton fibers after protonation of the amino-terminated hyperbranched polymer, dye can be actively adsorbed, inorganic salt and alkali are not used, and the dye-uptake and color fastness are high, so that the method has a wide prospect in the field of salt-free ecological dyeing.

The invention relates to the technical field of ceramic manufacturing, and concretely relates to a jade-white porcelain prepared from modified Jiefu kaolin, and a preparation process thereof. The jade-white porcelain prepared from the modified Jiefu kaolin comprises a ceramic green body, and the ceramic green body is prepared from the modified Jiefu kaolin, Dehua kaolin, quartz, montmorillonite, potassium feldspar, high-temperature frit and tricalcium phosphate. According to the jade-white porcelain prepared from the modified Jiefu kaolin, the modified Jiaofu kaolin is introduced as a raw material, the problems that Dehua kaolin is soft, low in iron content and high in potassium content are solved, the prepared jade-white porcelain is high in cleanliness, flawless, fine, pure, free of glazing and fine in body, the jade-white porcelain can meet the manufacturing requirements of art ceramics and daily ceramics, the production cost of traditional jade-white porcelain is reduced, the low-quality Jiefu kaolin is utilized, and the jade-white porcelain has positive economic benefits and social benefits for promoting the development of Dehua ceramic production areas and the popularizationof the jade-white porcelain.

The invention discloses a high-density polyethylene flame-retardant sub-pipe prepared from the following raw materials, by weight: 100 parts of high-density polyethylene, 3-6 parts of a plasticizer, 0.1-0.8 part of a 1010 type antioxidant, 0.2-1 part of a 168 type antioxidant, 0.3-2 part of calcium stearate, 0.2-3 part of 58 # paraffin, 8-15 parts of titanium dioxide, 4-8 parts of 2000-mesh lightcalcium carbonate and 3-6 parts of halogenated hydrocarbon. The polyethylene pipe provided by the invention has good ultraviolet resistance, can effectively delay the aging speed of the polyethylene pipe, also has good flame retardant property, and adapts to the use requirements of places such as high-rise buildings and coal mines. The invention further provides a preparation method of the high-density polyethylene flame-retardant sub-pipe, the preparation speed of the pipe can be increased, the raw materials are uniformly mixed in the reaction kettle, and the chemical reaction is stable.