2397results about How to "No precipitation" patented technology

The invention relates to a temperature-resistant salt-resistant composite foam oil displacement agent for tertiary oil recovery and a preparation method thereof, belonging to the field of chemical oil displacement for increasing the crude oil recovery ratio of the oil field. The oil displacement agent is compounded by 0.5-1% of alpha-alkene sulfonate as a main surfactant and other auxiliary agents and comprises the following components in percentage by mass:0.1-1.5% of anionic surfactant, 0.2-0.8% of zwitterionic surfactant, 2-10% of organic solvent, 5-12% of stabilizing agent and the balance of a salt solution added to be 100%. Compounds related to the oil displacement agent are industrially produced fine chemical products, the raw materials are easy to obtain, the production cost is low, and the preparation is simple; the oil displacement agent has performances of temperature resistance, salt resistance, ultralow interfacial tension and the like; the persistence of the foam is strong, and the half-life period can be more than 120min at 85 DEG C; the oil displacement age has excellent compatibility with other surfactants, and the comprehensive recovery ratio of the crude oil can be increased by about 10-15%.

The invention discloses lutein ester microcapsule powder and a preparation method thereof. The preparation method comprises the following steps of: preparing an oil phase solution and a water phase solution respectively, and mixing and emulsifying the oil phase solution and the water phase solution; and non-water raw materials comprise the following components in part by weight: 1 part of lutein ester crystal, 0.05 to 0.1 part of oil phase antioxidant, 0.02 to 0.1 part of oil phase emulsifying agent, 0.05 to 1 part of plant oil, 0.5 to 25 parts of wall material, 0.1 to 0.5 part of water phaseemulsifying agent, 0.05 to 1 part of water phase antioxidant, and the balance of filler. In the preparation method for the lutein ester microcapsule powder, the oil-soluble lutein ester is fully dispersed in cold water in the form of sub nanometer particles, and the product can be self-emulsified in water, and is good in instant capacity and self-emulsification capacity, and high in stability, and has uniform and durable color; and the phenomena of oil floating, precipitation, adhesion to a bottle wall and the like are avoided during application. Organic solvents are not introduced in the powder, so solvent residues are avoided in the product. The production process is environment-friendly, simple and practicable, expensive equipment is not needed, and the microcapsule powder can be industrially produced easily and conveniently.

The invention relates to a liquid accelerator for shotcrete and a method for preparing the same. The liquid accelerator is prepared from the following components in percentage by weight: 25 to 70 percent of aluminum sulfate, 0 to 8 percent of metal fluoride, 1 to 10 percent of amine substance, 0.5 to 7 percent of pH regulator, 0.01 to 1 percent of thickening agent, and the balance being water. The method for preparing the liquid accelerator comprises the following steps: firstly, dissolving the fluoride into the water; secondly, adding the amine substance to the mixture and heating the solution to a temperature of between 40 and 80 DEG C; thirdly, adding the aluminum sulfate to the solution to perform heat preservation reaction until the solution becomes a uniform liquid; and fourthly, adding the pH regulator and the thickening agent to the uniform liquid and stirring the mixture evenly to finally obtain a uniform liquid substance which is the liquid accelerator for the shotcrete. The liquid accelerator is free from corrosion, has no penetrating odor, has good storage stability so that the phenomena of deposition, crystallization and the like do not appear after the storage of more than 6 months at a temperature of between 0 and 35 DEG C, and does not influence the effect in practice. Using the liquid accelerator with lower mixing proportion (5 to 8 percent), cement can be initially set within 4 minutes and finally set within 10 minutes, and the strength of cement mortar within one day is more than 10 MPa and the storage rate of the strength within 28 days is more than 100 percent.

The invention discloses a preparation method for composite nano particcle of superparamagnetic ferric oxide. Wherein, adding ammonia and sodium citrate synchronously and speed controlled to make ions of Fe3+ and Fe2+ coprecipitate and form Fe3O4 nano particle with water-phase dispersion surface adsorbed by citric acid radical that can be substituted by multi chemical functional group on basic condition as crystal seed for sodium citrate-goden chloric acid reduction reaction and form SPION nano particle.

The invention discloses a hydrophilic diamond-suspended grinding and polishing solution and a preparation method thereof. The hydrophilic diamond-suspended grinding and polishing solution comprises the following raw materials in percentage by weight: 0.05-15% of diamond powder, 0.005-15% of suspending agent, 0.005-12% of surfactant, 0.05-60% of friction modifier, 0.0005-5% of pH value regulator and the balance of dispersion medium. The hydrophilic diamond-suspended grinding and polishing solution provided by the invention can keep a stable and uniform state for a long time and can not cause precipitation, sedimentation and inactivation phenomena; and the suspending medium plays a role of a suspending carrier and also has the effects of cooling, lubrication and chip removal in the grinding and polishing process.

The invention discloses high-concentration full-nutrition functional suspension liquid fertilizer and a preparation method thereof. 1-5 parts of functional additive, 40-60 parts of major element fertilizer, 1-5 of medium element fertilizer, 0.5-2.5 parts of trace element fertilizer, 0.5-2.5 parts of suspension agent and 20-40 parts of water are homogeneously emulsified and evenly mixed in a specific order to prepare the product. The obtained suspension liquid fertilizer is rich in nitrogen, phosphorus, potassium and medium and trace elements and has comprehensive nutrients and a reasonable ratio, and sufficient nutrients can be provided for different stages of plant growth. The functional additive contained in the product has the functions of positively promoting the plant growth and conditioning the soil, the physiological metabolism of plants can be stimulated, the stress resistance can be enhanced, the body immunity can be improved, the soil structure can be improved, the utilization rate of various nutrients by the plants can be increased, the yield of crop products is increased, and the quality of the crop products is improved. The fertilizer is fully water-soluble, good in fluidity and suitable for an integrated irrigation system of water-soluble fertilizer; the fertilizer is produced under normal temperature and normal pressure, the equipment is simple, large-scale production is easily achieved, and the labor degree is reduced.

The invention discloses treatment liquid and a method for preparing a Ti / Zr-containing yellow passive film on the surface of an aluminum alloy. Each liter of treatment liquid comprises the following components by weight: 0.5 to 2.0g of fluorotitanic acid, 0.4 to 2.0g of fluorozirconic acid, 2.0 to 5.0g of manganate and 0.5 to 2.0g of organic acid; and the pH value of the treatment liquid is between 2.0 and 3.0. The treatment liquid of the invention does not contain chromium or other toxic substances, conversion treatment is realized without heating, the treatment time is between 5 and 30 minutes, and a yellow Ti / Zr-containing chemical conversion film can be prepared on the surface of the aluminum alloy. The chemical conversion film prepared by the method has high decay resistance and high bonding strength with a substrate, and is treated at room temperature by a simple process; and the coating does not contain hexavalent or trivalent chromium which is harmful to environment and human bodies.

The invention relates to a halogen-free flame-retardant acrylonitrile butadiene styrene (ABS) / polycarbonate (PC) alloy material for electrical engineering and a preparation method thereof. The halogen-free flame-retardant ABS / PC alloy material for electrical engineering comprises the following components in part by weight: 55 to 63 parts of ABS, 21 to 34 parts of PC, 2 to 7 parts of maleic anhydride grafted ABS compatilizer, 7 to 15 parts of organic phosphate flame retardant, 0.1 to 0.5 part of anti-dripping agent FA500B, 1.0 to 3.0 parts of organic silicon Dymgard and 0.2 to 0.5 part of composite antioxidant. In the preparation method, the halogen-free flame-retardant ABS / PC alloy material for electrical engineering is prepared by mixing, plastifying, extruding and pelleting at one step by using a double-single-screw double-step extruder. The comprehensive properties of the product can meet shell performance requirements of storage batteries special for subway engineering, electric locomotives and mobile stations.

The invention discloses an antitranspirant foliar fertilizer and a preparation method thereof. The antitranspirant foliar fertilizer comprises the raw materials of copper sulfate, ethylene diamine tetraacetic acid, monopotassium phosphate, zinc sulfate, ferrous sulphate, manganese sulphate, ammonium molybdate, composite rare earth, boric acid, sodium dodecyl sulphonate, urea, fulvic acid, hexanoic acid 2-(diethylamino) ethyl ester, compound amino acid, magnesium sulfate, calcium nitrate, ethylene diamine tetraacetic acid, microbial agent, azone and ammonia water. The antitranspirant foliar fertilizer provides nutrient elements and microbial agents which are required by the growth of plants, the rare earth and amino acid and other beneficial elements, can promote the growth of the plants, improve the yield, the quality, the stress resistance of the plants and the absorbing and operating capabilities on trace elements, simultaneously can effectively reduce the transpiration of the plants and is applied to afforesting in arid regions.

The invention discloses a nitrogen-doped carbon nanometer particle as well as a preparation method and application thereof, belongs to the field of nanometer material science and is used for solving the technical problems that fluorescence quenching is easily caused to the aggregative state of the carbon nanometer particle due to surface passivation modifier which is added for the preparation of existing carbon nanometer particles. The nitrogen-doped carbon nanometer particle is prepared through a microwave method by using organic compounds containing polycarboxyl or polyhydroxy as materials and using ammonia water as a solvent and a nitrogen doping source. The invention further provides the application of the nitrogen-doped carbon nanometer particle as fluorescent ink and fluorescent glue. The preparation method disclosed by the invention is simple, low in cost, and convenient to realize large-scale production; the maximal fluorescent quantum efficiency of the solid film formed by the prepared fluorescent glue is as high as 84%; the prepared fluorescent ink is non-toxic, generates no precipitates after being placed for a long time, is strong in fluorescence characteristic and can be applied to various fields such as bio-imaging, biological product identification, information storage, information encryption, counterfeiting prevention, illumination and display, sensing and photovoltaic devices.

The invention discloses preparation and an application for a heavy metal chromium contaminated soil remediation material. Preparation for biological carbon particles comprises the following steps: 1) cleaning, drying and crushing agriculture waste to obtain a substance A; and 2) placing the substance A under a protective atmosphere to deoxidize and carbonize, and grinding and sieving carbonize products to obtain the biological carbon particles. Preparation for supported type nano zero-valent iron particles comprises the following steps: 1) preparing ferrite into a solution; 2) adding biological carbon particles into the solution, and uniformly mixing the biological carbon particles with the solution; and 3) dissolving a reducing agent into a solvent to obtain a mixture, adding the mixture into the system in the last step under the protective atmosphere, stirring the mixture, sufficiently reacting the mixture, separating nano zero-valent iron, washing, drying and grinding the nano zero-valent iron to obtain the supported type nano zero-valent iron particles. The invention further discloses the application of the supported type nano zero-valent iron particles to remediating chromium contaminated soil in situ. The in-situ remediation method for the heavy metal chromium contaminated soil comprises the following steps: adding the supported type nano zero-valent iron particles into soil, uniformly mixing the supported type nano zero-valent iron particles, adding deoxygenated water, and carrying out remediation. The remediation material prepared by the preparation disclosed by the invention is high in efficiency of remediating the chromium contaminated soil, and capable of improving the soil structure and improving the soil fertility.

The invention relates to a temperature and pH stimuli-responsive intelligent polymer microcapsule and preparation thereof. The microcapsule comprises two polymers sensitive to temperature and pH, and an interpenetrating network structure is formed between the two polymers. Preparation includes the following steps: (1) uniformly blending tetraethyl orthosilicate, aqueous ammonia, water and absolute ethyl alcohol, and then adding surface modifier; (2) adding temperature-sensitive monomer and crosslinking agent into the modified dispersion, and adding initiator for reaction; (3) after diluting the emulsion by five to fifteen times, adding pH-sensitive monomer and crosslinking agent, and adding initiator for reaction; and (4) dispersing the white emulsion of core-shell composite particles with shells formed into a interpenetrating polymer network structure into hydrofluoric acid, and carrying out centrifugal separation or dialysis purification. The microcapsule can respectively respond tothe stimulation of temperature and pH, and moreover, the two types of stimuli responsiveness are independent from each other, and therefore have little interference on each other. The preparation method is simple, and is suitable for industrial production.

The present invention provides a method for processing brine, which can use low-concentration brine such as seawater, etc. for manufacturing deionized water such as drinking water, industrial water, etc. and high-purity common salt that can be used for brine electrolysis. The salinity of compressed brine can be easily controlled to a degree equal with that of seawater, and furthermore the amount of custoff is little. The invention relates to a method for manufacturing deionized water, solid slat which can be used for brine electrolysis or high-concentration brine. The method is characterized in that the method uses a brine processor for processing the low-concentration brine. The brine processor comprises an electrodialysis device which uses univalent ion permselectivity cation exchange membrane and univalent ion permselectivity anion exchange membrane, an evaporating concentrating device and reverse osmosis membrane device.

The invention relates to a preparation method of magnetic graphene, in particular to a chemical preparation method of magnetic graphene. The preparation method aims at solving the problems of the existing synthesis method that the reaction process is toxic and harmful to the environment, large-scale production cannot be realized, the morphology, size and magnetism of magnetic nanoparticles in the magnetic graphene are not controllable and the magnetic graphene cannot be dispersed in water. The chemical preparation method comprises the steps of: 1) preparing aminated Fe3O4 magnetic nanoparticles; 2) preparing graphene; and 3) preparing magnetic graphene through chemical reaction. The chemical preparation method of the magnetic graphene has the advantages that the high temperature and the high pressure are not required, the equipment is simple, the process cost is low, the environment is protected, no pollution is caused, the grain size of the synthesized magnetic nanoparticles is uniform, the controllable growth of the magnetic nanoparticles can be realized by changing reaction conditions, the solubility of the synthesized magnetic graphene is 0.8-1.2mg / ml, the magnetic graphene can be stably dispersed in water and sediment does not occur within 1-2 months. The graphene prepared by adopting the method can be used in biomedical, energy, electronic fields and the like.

The invention discloses a preparation method of nanometer modified corona-tolerant enamel of enameled wire which comprises the steps of, taking 1-20 parts of inorganic oxide nano particles, charging 3-100 organic solvent, dispersing the inorganic oxide into uniform nano dispersed state at room temperature, charging 0.1-1.0 part of modifier for reacting 1-3 hours at 50-140 deg. C, obtaining modified nano material slurry, charging 60-100 parts of insulating resin into modified nano material slurry for reacting 3-6 hours at 70-120 deg. C.

The invention discloses a water-based dye ink and an application thereof. The water-based dye ink comprises the following components in percent by weight: 0.2 to 12 percent of water-soluble dye, 55 to 80 percent of modified acrylic resin emulsion, 0.01 to 1 percent of ultraviolet absorbent and balance of water, and different additives can be added. The dye ink can be applicable to the fields such as jet ink, cipher paint ink, textile printing ink, water-type printing ink, fountain pen ink and water ball pen ink, and has the advantages of water resistance, oil resistance, scratch resistance, illumination resistance, high temperature resistance, low temperature resistance, good color reducibility, duration and the like.

The invention relates to a process method of radiation vulcanization which applies the high energy radiation technology in medical rubber products, in particular to a vulcanization method of the environment protecting medical rubber products that can improve the safety and not-pollution property of the medical rubber products. Green rubber compound, reactive environment protecting cross-linking coagent, filler and compounding agent are mixed in a regulated weight ratio, and then are mixed in a mixing facility, so that non cross-linked rubber profiles are formed preliminarily. The non cross-linked rubber profiles are treated in radiation vulcanization for once or a plurality of times and then become the medical rubber products. The invention has the advantages of good safety, high chemical stability, air tightness and cleanness, no residue precipitation with irritability, volatility and anaphylaxis, ozonation resistance, crack resistance, heat resistance and fine mechanical property, and also has the advantages that the time of the radiation vulcanization is reduces, the energy is saved, fast radiation disinfection proposal method can be accepted.

The invention relates to a processing method of a concentrated sugarcane juice. The processing method comprises the following steps: aiming at the difference of the proportions of nutrient contents and flavor substances contained in sugarcane meat and sugarcane skins, respectively processing the sugarcane and the sugarcane skin into a concentrated sugarcane meat juice and a clarified sugarcane skin juice, and mixing and homogenizing to obtain the concentrated sugarcane juice. The processing method comprises the following specific steps: peeling the sugarcane to the obtain the sugarcane meat and the sugarcane skins, firstly carrying out squeezing, enzyme pre-destruction and sterilization, rough filtration, enzymolysis, ceramic membrane ultrafiltration and vacuum concentration on the sugarcane meat, then carrying out squeezing to obtain the concentrated sugarcane meat juice, carrying out enzyme pre-destruction and sterilization, rough filtration, enzymolysis and ceramic membrane ultrafiltration on the sugarcane skins to obtain the clarified sugarcane skin juice, finally mixing and homogenizing the concentrated sugarcane meat juice with the clarified sugarcane skin juice, and carrying out high-temperature instant sterilization, so as to obtain the concentrated sugarcane juice. The concentrated sugarcane juice prepared by virtue of the processing method is clear and transparent, has aromatic flavor and fresh, sweet and delicious taste, the original flavor and nutritional ingredients of the sugarcane are maximally preserved, and precipitation and a turbid phenomenon are avoided in a storage period.

The invention provides a Ti-based oxide composite coating electrode which is characterized in low cost, small power consumption and long service life, comprising titanium metal plate vector, an intermediate layer arranged on the surface of the vector and a surface active layer arranged outside of the intermediate layer. Wherein, the composition of the intermediate layer is Sn0<2> and Sb<2>0<3> and the molar ratio of Sn to Sb is 100: (5-15), and the composition of the surface active layer is Sn0<2>, Sb<2>0<3> and Ce0<2> and the molar ratio of Sn to Sb to Ce is 100: (5-15): (0.5-3). The electrode of the invention effectively makes use of non-noble metal electrode, reduces cost of electrode material. Because the intermediate layer is arranged, a bonding force between the surface active layer and the vector is greatly strengthened so as to extend service life. The electrode manufacturing method of the invention comprises steps of polishing the titanium metal plate vector, processing acid etch, coating the intermediate layer on the surface of the titanium metal plate, and coating the surface active layer.

The invention relates to a production process of germ and corn composite nutritional powder and the product of the production process, and belongs to the technical field of food processing. The production process is characterized in that mixing corn which sprouts in stress with wheat germ which is subjected to microwave enzyme inactivation; performing extrusion and superfine grinding to prepare germ and corn meal; adding carrot meal, spirulina meal, white granulated sugar, maltodextrin and vegetable fat powder into the germ and corn meal; and sterilizing and packaging to prepare the germ and corn composite nutritional powder. The production process is simple and high in industrial degree, so that the germ resource can be further utilized, corn can be completely utilized, and the additional value of agricultural products can be increased. The germ and corn composite nutritional powder produced by the production process is good in dissolubility, fine in taste and high in nutritional value, is rich in gamma-aminobutyric acid, glutathione, octacosanol, dietary fiber and other components, has the functions of improving brain functions, calming nerves, improving sleeping, resisting oxidation, delaying senescence, improving body immunity and the like, and is an ideal health-care nutritional food, wherein the content of gamma-aminobutyric acid in the product is between 20 and 60mg / 100g.

The invention discloses an organic silicon modified waterborne polyurethane leather coating agent which comprises the following raw materials in parts by weight: 30-50 parts of polyether polyol, 10-30 parts of isocyanate, 1-8 parts of castor oil, 0.1-11 parts of end hydroxyalkyl polydimethylsiloxane, 0.01-1 part of a catalyst, 1-10 parts of a hydrophilic chain extender, 5-25 parts of an organic solvent, 1-5 parts of a salt-forming agent, 1-3 parts of a small-molecule chain extender and 120-250 parts of deionized water. Correspondingly, the invention further provides a method for preparing the organic silicon modified waterborne polyurethane leather coating agent. By adopting the organic silicon modified waterborne polyurethane leather coating agent, properties such as the water resistance, the cold resistance, the solvent resistance and the surface property of synthesized waterborne polyurethane are all remarkably improved, the process is simple, the operation is convenient, the prepared emulsion is uniform and stable, no sediment is generated in the water dispersion and storage process, a coating film is transparent and bright, and the application prospect in leather coating is wide.

The invention discloses a method for preparing NZVI (nano-scale zero-valent iron) from green tea as well as an application of a suspension of the NZVI. The method comprises technological steps as follows: A, preparing a green tea dissolution solution; B, preparing a ferric trichloride solution; C, preparing the GT-NZVI (green tea-NZVI) suspension. The prepared GT-NZVI has the advantages of good suspension stability, simple preparation technology, low cost, environment-friendliness, good stability, high penetrability in an aquifer and capability of quickly and thoroughly removing hexavalent chromium in sewage and underground water.

The invention relates to a production process of solidified brown yogurt and a product of the process, which belong to the technical field of liquid milk processing. The production process comprises the following steps of: uniformly mixing 87.5%-90.5% of raw milk, 7.5%-8.5% of edible sugar, 1.5%-2.5% of whey protein and 0.5%-1.5% of milk protein concentrate in percentage by weight, and performing homogenization, sterilization for browning, cooling, inoculation, bottling, fermentation and cold storage on the mixture to obtain the yogurt. The process can be used for producing the solidified brown yogurt having the characteristics that the curd is firm, no whey is separated out, the color is brown, the mouthfeel is thick and smooth, and the yogurt has a pleasant Maillard flavor. By virtue of the process, under the condition that no additive needs to be used, the jelly strength and the water retention property of the yogurt can be improved, so that the solidified brown yogurt is thick and smooth in mouthfeel and has the pleasant Maillard flavor; and in logistic and sale links, the mechanical disruption resistance of the yogurt is high, and no whey is separated out in the shelf life of the yogurt.

The producing method of two-oxidation titanium fibre belongs to function fibre material technology scopes. Compose poly-acetamide acetone titanium to be the van-substance. Let chemic dosage of four-chloridize titanium, distilled water, acetamide acetone and three-ethylamine dilute in methanol respectively. Mix them and react when mixing round at 0-25 deg.C. Compose poly-acetyl acet, titanium. Remove hydrochloric three-ethylamine by using four-hydrogen furan. Dissolve poly-acetyl acet, titanium in methanol to make filature liquid. Obtain van-substance short fibre by using acentric swing method. Obtain van-substance long fibre by using dry filature method. And we can obtain two-oxidation titanium fibre by using high pressure or normal pressure vapor heat treatment technique agglomeration. The intension of extend of this invention is 100 MPa-1.2GPa. The diameter is 3um-20um. The one-thread series length is 1 cm-50 cm or higher than 1 m. The crystal diameter is 5 nm-100 nm. The appearance is two-oxide ation short fibre or consecutive fibre with titanium droff-titanium-mine posture or rutile posture or coexistence.

The invention relates to polycarboxylic efficient concrete water reducer for high-performance prefabricated parts and a synthesis method thereof. The polycarboxylic efficient concrete water reducer in a comb structure is characterized by being formed by using TPEG 2400 (methyl alkenyl polyoxyethylene ether), unsaturated crylic acid and activated monomer AMPS (2-acrylamide 2- methylpro panesulfonic acid), and using a redox system (hydrogen peroxide-VC (ascorbic acid)) for one-step mid-temperature aqueous free radical polymerization. The polycarboxylic efficient concrete water reducer is provided with active groups such as ether bonds, carboxylic acid groups, sulfonic acid groups, polyoxyethylene alkyl ethers and amide groups on long main chains and side chains. The product with 40% solid content has the effects of high water reducing rate, high early strength, low gas content, low chlorine, low alkali and no rusting to reinforcement steel bars. The product is prepared into the product with 20% solid content for use. After 1.0-1.2% of cementing material is added, the product has fine wrapping performance and water retentivity when slump is 30-50mm. The product can be used for concrete for high-performance prefabricated parts, such as C80 high-strength tubular piles and C60 prefabricated beams.

The invention provides conductive silicone rubber with electromagnetic shielding performance and a manufacturing method, and belongs to the field of preparation of organic polymer / metal composite material and chemical processing. The conductive silicone rubber employs silicone rubber elastomer as a base and employs silvered nickel powder and silvered copper powder for enhancing the magnetic conductibility and the electric conductivity of the material and for further enhancing the comprehensive mechanical properties and the electromagnetic shielding performance of the composite material, and the conductive silicone rubber material has relatively good electromagnetic shielding performance at a frequency range of 200 KHz-10 GHz, is applicable to electromagnetic shielding of transformer stations, and can satisfy the material installation construction technology because of the good strength and toughness.

The present invention discloses composite phase change heat storage organic matter / expandable graphite material and its preparation process and corresponding heat storage device. Of the composite material, the organic matter absorbed into the micropores of the expandable graphite accounts for 40-90 wt%, and is saturated fatty acid or linear paraffin as the phase change heat storage material with phase change temperature of 60-75 deg.c, phase change latent heat of 70-180 J / g and heat conductivity coefficient of 1.12-4.52 W / m.K. The heat storage device is one container, which is made of high heat conductivity metal material, has filled and sealed composite phase change heat storage organic matter / expandable graphite material, and is provided with metal fins. The device is used to cool electronic element fast.

The invention discloses a wet smelting method for preparing a natural rubber / nanometer silicon dioxide rubber compound, which comprises the following steps of: mixing natural rubber latex with silicon sol solution to form a wet smelting system; heating the silica sol to generate condensation reaction to generate the SiO2 gel with properties, heating the wet smelting system to generate the silica sol into nanometer silicon dioxide particles in situ and uniformly dispersing the nanometer silicon dioxide particles into NR (Natural Rubber) emulsion to form the NR / nanometer silicon dioxide rubber compound after condensation and co-precipitation; and mixing the natural rubber latex with a nanometer silicon dioxide dispersing body to form the NR / nanometer silicon dioxide rubber compound after condensation and co-precipitation. The wet smelting method has the beneficial effects that the mass ratio of natural rubber / nanometer silicon dioxide prepared by the wet smelting method is 100 / 30-90, and vulcanized rubber of the nanometer silicon dioxide has excellent physical and mechanical properties and is high-quality rubber for preparing truck radial tire tread rubber with high wet skid resistance and low rolling resistance, i.e. green tire.

The invention relates to multi-coordination-agent cyanide-free electrogilding liquid and an electrogilding process, which belong to the technical field of electrogilding. The electrogilding liquid is prepared from a main coordination agent, an auxiliary coordination agent, potassium hydroxide, potassium carbonate, goldpotassium chloride, combined additives and ultrapure water. The electrogilding process comprises the following steps: 1, preprocessing a substrate; 2, electroplating an intermediate nickel plating layer; 3, electrogilding, namely washing the substrate after electroplating the intermediate nickel plating layer with ultrapure water, directly feeding the substrate into a plating cell containing the multi-coordination-agent cyanide-free electrogilding liquid to be electrogilded, taking out a sample from the electrogilding liquid after the electrogilding, washing the surface of the sample by utilizing distilled water, and drying the sample through cold air. Double coordination agents are used as the coordination agents of gold ions in the electrogilding liquid, so that a cyanide-free electrogilding system which has high current efficiency, smoothness and compactness in plating layer crystallization, wide current density range, wide temperature requirement and capability of guaranteeing the golden bright appearance of the plating layer compared with those of a single coordination agent system is obtained.