1044results about How to "Increased dispersion" patented technology

The invention relates to a high-elasticity asphalt modified composition, a modifier, modified asphalt, a modified asphalt mixture and a preparation method. The modified composition comprises 100 parts of a styrene-butadiene-styrene segmented copolymer, 20-40 parts of a tackifier, 20-40 parts of a softener, 3-8 parts of a warm mixing agent, 15-40 parts of a plasticizer and 2-6 parts of a stabilizer. The preparation method of the modifier comprises the following steps: (1) mixing the styrene-butadiene-styrene segmented copolymer, the tackifier and the warm mixing agent according to a formula to obtain a melt; and (2) mixing the softener, the plasticizer and the stabilizer with the melt, and then extruding, cooling and dicing. The modified asphalt is prepared by doping the modifier into matrix asphalt and uniformly mixing. The modified asphalt mixture is prepared by mixing the modified asphalt and a raw material of a mineral mixture. The modified asphalt provided by the invention has good high-temperature and low-temperature stabilities and anti-fatigue capacity, and the modified asphalt mixture is strong in construction workability and good in pavement performance.

A polymetallic bulk catalyst for diesel oil hydrodesulfurization is provided. The particle diameter of the present invention is 10-100 nm, and the present invention consists of a species of VIII metal and two species of VIB metal, wherein, the mole ratio of the VIII metal and the VIB metal is 1:9-9:1, while the mole ratio of two species of VIB metal is 1:5-5:1. The preparation method is that: a) the basic carbonate of VIII metal is led to dissolve in solvent to form suspension liquid; b) two species of metal salts of the VIB metal are led to dissolve in the solvent, and surfactant is added into the solvent, stirred and heated to 50-250 DEG C; c) the suspension liquid in step a is added into the solvent in step b and led to react in reflux for 4-25 hours under 50-250 DEG C; d) the product obtained in step c is filtered, washed and dried to obtain target product. The catalyst of the present invention is used in the ultra-deep hydrodesulfurization of diesel oil and shows extremely high hydrodesulfurization activity. Under the same operating conditions, the activity of the present invention is 5.9 times as much as industrial reference agent.

The invention discloses a preparation method for a composite material of cellulose nanofiber and reinforced polyurethane. The method comprises the following steps: 1) pretreating in a chemical method; 2) unfastening fibers in a mechanical method. According to the invention, chemical treatment and mechanical treatment are adopted to separate the cellulose nanofiber, which has a high length diameter ratio and is used for reinforced polyurethane, from newspaper; the transparent nano composite material with high-intensity is prepared; wood meal and newspaper are adopted as raw materials to prepare cellulose nanofiber through the chemical treatment combined with the mechanical treatment; the diameter range of the cellulose nanofiber is 30-100 nm, and the length diameter ratio is higher than 1000.

A catalyst based on MnOx/TiO2 system for low-temp selective catalytic reduction of NOx is proportionally prepared from alkoxy compound of Ti, alcohol solvent, water, protonic acid, soluble salt of Mn and the soluble salt of transition element through proportional mixing, stirring until sol becomes gel, drying, grinding and high-temp calcining.

The invention discloses a secondary gravel screening device which comprises a base plate. A supporting frame is vertically and fixedly installed on the base plate. A drive motor is fixedly installed at the left side of the supporting frame. The right side wall of the supporting frame is provided with a driven bevel gear in meshing connection with a driving bevel gear in a rotary mode. A feeding pipe is arranged at the upper end of a screening box. A horizontal plate is horizontally and fixedly installed on the outer wall of the right side of the screening box. A stepping motor is fixedly installed on the horizontal plate. A driven gear in meshing connection with a driving gear is fixedly installed at the upper end of a rotating shaft. According to the secondary gravel screening device, gravel can be scattered in a rotating mode through rotation of blades and a shifting plate with through holes, the scattering degree of the gravel before screening is increased, and the gravel screeningefficiency is improved. A second sieve plate and a first sieve plate make left-right reciprocating motion under the driving action of a second connecting rod and a first connecting rod correspondingly, the fast screening effect on the gravel is achieved, the gravel, obtained after passing the second sieve plate and the first sieve plate, of different grain diameters enters a collecting groove to be collected, and discharging is convenient and rapid.

This invention discloses a method for preparing a blend of high-density polyethylene and ultrahigh molecular weight polyethylene, and its application. The method comprises: modifying ultrahigh molecular weight polyethylene with composite dispersant (resin with low melting point and low viscosity, and lubricant), blending with high-density polyethylene, and extruding. The blend comprises: ultrahigh molecular weight polyethylene 10-30 wt. %, composite dispersant 2-15 wt. %, and high-density polyethylene 5-10 wt. %. The obtained blend has a melt flow index of 0.1-0.3 g/10 min (190 deg.C, 2.16 kg), and can be processed into thin film of 20-100 mum by blow molding or tape casting. The thin film prepared by blow molding has higher tensile and tearing strength than neat high-density polyethylene thin film, and fewer crystal spots on the surface than that prepared by simple blending.

The invention discloses a selective hydrogenation catalyst for producing biodiesel and a preparation method and application of the selective hydrogenation catalyst. The selective hydrogenation catalyst comprises a carrier and a main metal active ingredient loaded on the carrier, the main metal active ingredient accounts for 5-30% of the catalyst in weight and is one of or a combination of oxides containing Co, Mo, Ni and W, and the carrier is composed of, by weight, 1-8% of a molecular sieved, 25-65% of amorphous sial, 30-65% of alumina and 2-10% of a graphene auxiliary. The preparation method includes: disposing the carrier in a metal salt solution containing Co, Mo, Ni or/and W for soaking for 4-20 h to obtain a soaked carrier; freeze-drying and then calcining the soaked carrier to obtain the selective hydrogenation catalyst. With same carrying capacity of the carrier, active surface area represented by the carrier is large, the selective hydrogenation catalyst has more active sites, reaction temperature is lowered, and hydrogenation performance is improved.

The invention relates to fog seal modified emulsified asphalt which comprises the following components by weight: 18-35% of asphalt, 8-18% of an asphalt modifying agent, 5-12% of an asphalt regenerating agent, 1-4% of a compound emulsifying agent and 50% of water. The preparation method comprises the following steps: directly adding the asphalt modifying agent and the asphalt regenerating agent to hot melt asphalt for mixing to prepare modified asphalt; mixing and emulsifying the modified asphalt and an aqueous solution of the compound emulsifying agent through a colloid mill; and mechanically stirring to prepare the fog seal modified emulsified asphalt. The prepared fog seal modified emulsified asphalt has the advantages of good storage stability, good water dilutability, environmental protection in use, good surface consolidation performance after construction, good abrasion resistance, difficult sticking off by wheels, short traffic close time, improvement of construction conditions, improvement of construction efficiency, good water seal function, asphalt pavement water damage prevention, pavement structure protection and extension of pavement service life.

The invention discloses a PLA/PBAT biodegradable composite material, which is prepared from the following components in percentage by weight: 60-75% of a polylactic acid, 60-75% of poly(adipic acid)/butylene terephthalate, 1-5% of poly (caprolactone), 5-15% of an ethylene-vinyl acetate copolymer, 1-5% of an ethylene-vinyl acetate copolymer and polylactic acid graft copolymer, and 1-10% of vegetable oil polyols. The PLA/PBAT biodegradable composite material disclosed by the invention is excellent in tensile strength and toughness, good in chemical stability, and easy to process, and in addition, the material is biodegradable. The invention also discloses a preparation method of the PLA/PBAT biodegradable composite material, which can be implemented through the existing equipment twin-screw extruder, therefore, the method is easy to implement, strong in maneuverability, and easy to realize industrialized mass production, and has good economic benefits and broad application prospects.

The invention relates to an electrically-conducting paint, more specifically to a two-component aqueous polyurethane electrically-conducting paint and its preparation method. The electrically-conducting paint is prepared by the following steps of: firstly, preparing a polypyrrole/attapulgite nanometer conducting composite material; then, dispersing the obtained conducting composite material into an aqueous hydroxyl acrylic emulsion; and finally adding various auxiliary agents and hydrophilic modified polyisocyanates to obtain the two-component aqueous polyurethane electrically-conducting paint. The preparation method provided by the invention has a simple process; in addition, the product has high cost performance and is environmentally friendly.

The invention provides a boron and nitrogen co-doping activated carbon which is prepared through utilizing biomass. The boron and nitrogen co-doping chitosan-base activated carbon takes chitosan and boric acid as raw materials, wherein boron in the activated carbon accounts for 1-3wt%, nitrogen in the activated carbon accounts for 4.1-9.2wt%, the specific surface area is 500-1000m<2>/g, and the pore size distribution is 0.46-2nm. The boron and nitrogen co-doping chitosan-base activated carbon takes the chitosan and the boric acid as raw materials and is prepared through co-pyrolysis. According to a method, the combining quantity of the boron in a carbon source and the dispersion degree of the boron in the carbon source are increased under the mutual action of the protonated chitosan and the boric acid, and the boron and nitrogen co-doping chitosan-base activated carbon is obtained through the co-pyrolysis. An environmental-friendly technology for preparing the activated carbon without consuming strong acid and strong alkali is realized, so that a costly and non-environmental-friendly process which consumes a great deal of activating agent and water during the traditional process for preparing the activated carbon is avoided. Moreover, the boron and nitrogen co-doping chitosan-base activated carbon has the advantages of short time consumption, simplicity in preparation technology, simplicity and easiness in equipment and the like.

The invention discloses a preparation method and application of a perovskite type composite oxide catalyst. The perovskite type composite oxide catalyst is an A-position substituted perovskite type composite oxide. The structural formula of the catalyst is A1-xA'xBO3, wherein x is larger than 0 and smaller than 1; A is La or Nd element; the A'-position substitution ion is one of Ca, Sr, Ba, Ce and the like; and the B-position ion is one of Mn, Co, Ni, Fe and the like. The preparation method comprises the following steps of: according to a chemical metering ratio, weighing a water-soluble salt which contains the A-position, A'-position and B-position elements; mixing the salt and deionized water to obtain 5 to 20 percent salt solution; adding the solution into a beaker; adding activated carbon of which the mass is 0.1 to 1.5 times of the salt into the solution; completely soaking the activated carbon and standing; heating and stirring the mixture, continuously heating until the water content is completely evaporated, wherein the co-crystallized solid mixture is uniformly carried on the activated carbon, and after drying the mixture, grinding the mixture into powder; and sintering the powder in a muffle furnace, cooling the sintered powder with the furnace to room temperature, and grinding the cooled powder to obtain the powder of the perovskite type composite oxide mixed catalyst. The preparation method is suitable for production; and the electrode activity of the perovskite type catalyst can be greatly improved in a zinc air cell structure.

The invention provides a preparation method for silver powder, which comprises a step of contacting a silver nitrate solution with a reducing agent solution, thereby preparing the silver powder, wherein the silver nitrate solution contains a dispersing agent; the reducing agent solution contains a dispersing agent and a neutralizing agent; the silver nitrate solution and/or the reducing agent solution contain/contains a thickening agent; and a reducing agent in the reducing agent solution contains a strong reducing agent and a weak reducing agent and contains a medium strong reducing agent or medium reducing agent at the same time. According to the preparation method provided by the invention, the thickening agent is used for adjusting a viscosity of a reaction system, thus the aggregation of the silver powder is efficiently prevented; the method of using different reducing agents together is adopted for realizing the stability of the acidic and basic properties and the reaction rate of the reaction system, thereby preparing the silver powder with basically consistent appearance and excellent dispersing property; and the grain size adjustment and the appearance adjustment for the silver power can be realized by selecting different reducing agents in proportions, and the stability of the reaction rate also can be controlled.

The invention discloses a low temperature-resistant flexible crosslinkable halogen-free flame retardant cable material. The low temperature-resistant flexible crosslinkable halogen-free flame retardant cable material is obtained through mixing 60-80 parts of an ethylene-vinyl acetate copolymer, 10-40 parts of polyethylene, 0-30 parts of ternary ethylene propylene rubber, 2-10 parts of a resin compatilizer, 35-65 parts of a halogen-free expanded flame retardant and 0.5-2 parts of a crosslinking agent, wherein at least one charring agent component in the halogen-free expanded flame retardant has a melting point of 155DEG C or less and an initial pyrolysis temperature of 245DEG C or less. The invention also discloses a preparation method of the cable material. The processing temperature of the introduced low-melting-point high-initial-pyrolysis-temperature charring agent component has a wide window and is matched with the processing temperature of a cable material matrix resin, so the charring agent component can be fused and well dispersed in the processing process, thereby the flame retardation efficiency is improved, the influences on the mechanical performances of the matrix resin are reduced, and the cable material has an excellent flame retardation performance and excellent mechanical performances. The preparation method has the advantages of simplicity, convenient operation, easy control and easy industrial production.

The invention relates to a preparation method of graphdiyne. The preparation method comprises that 1, in a nitrogen or argon protective atmosphere, a reaction substrate 1,3,5-tripropargylbenzene and a catalyst are put into a reaction container, a solvent is added into the reaction container to dissolve the materials in the reaction container, and the solution undergoes a heating reaction, 2, in the reaction process in the step 1, the solution is subjected to vacuum pumping process multiple times so that a reaction side product 2-butyne is removed and a solvent is supplied to make up for a loss of the solvent, and 3, after the reaction, the reaction product is purified so that the product graphdiyne is obtained. Compared with the prior art, the preparation method has simple processes. The prepared graphdiyne has the uniform surface and a low oxidation degree and can stably exist in air.

The invention discloses an oilproof and flame retardant conveyor belt, belonging to the technical field of conveying materials. Cover rubbers and middle bonding rubber masses of the conveyor belt comprise the following components based on weight proportions: 20-40 parts of neoprene, 60-80 parts of nitrile rubbers containing propylene, 15-20 parts of chlorinated polyethylene, 50-70 parts of compound flame retardant, 3-5 parts of combined dispersant, 3-5 parts of zinc oxide, 1-2 parts of stearic acid, 1.0-1.5 parts of accelerators, 3-5 parts of age inhibitors, 40-50 parts of carbon black and 2.0-3.0 parts of sulfur. The oilproof and flame retardant properties of the conveyor belt are greatly improved; the oilproof property reaches related national standard (HG/T3714-2003) and the flame retardant property also meets the national security requirement (GB/T10082-2003).

The invention relates to an anti-static non-woven fabric and a preparation method thereof. The anti-static non-woven fabric is prepared from the following components in parts by weight: 85-98 parts of polyester, 2-10 parts of a polyamide polymer, and 0.5-5 parts of an antistatic agent. The non-woven fabric prepared by adopting the preparation method is smaller in diameter of fibers; the obtained non-woven fabric has the advantages of large specific surface area, high porosity, excellent filtering efficiency, good softness, strong comfortable feeling and the like. The non-woven fabric can be widely applied to fields such as medical and industrial masks, thermal insulation materials, filtering materials, medical and health materials, oil absorption materials, wiping cloth, battery separators and sound insulation materials.

The invention relates to a polyacrylate grafted vinyl chloride composite resin and a preparation method thereof. The polyacrylate grafted vinyl chloride composite resin is prepared from the following components in parts by weight: 100 parts of vinyl chloride, 2-15 parts of polyacrylate latex (calculating by solid content), 100-200 parts of deionized water, 0.08-0.16 part of a dispersant, 0.025-0.040 part of an oil-soluble initiator and 0.006-0.009 part of a pH value adjusting agent. Polyacrylate latex is prepared by: continuing to dropwise add or not add acrylate into the system after acrylate is subjected to a polymerization reaction at 65-95 DEG C. The prepared polyacrylate grafted vinyl chloride composite resin is good in impact resistance, short in plasticizing time and excellent in processing fluidity.

The invention discloses a catalyst used for synthesis of paraxylene through alkylation reactions between coking benzene and methanol and a preparation method thereof. The catalyst comprises carriers and active components, the carriers are HZSM-5 molecular sieves or SAPO-11 molecular sieves which have been subjected to a water steam heating treatment, and the active components are metal oxides. The molecular sieves are subjected to a high-temperature water steam heating treatment, thus active centers and acid-base properties of the molecular sieves are evenly distributed, and the acidity of the molecular sieves is reduced, so active components can be evenly loaded on the carriers, the catalyst is not easy to be poisoned or lose activity when the catalyst is catalyzing the alkylation reactions of coking benzene, the conversion rate of the alkylation of coking benzene is increased, and the service life of the catalyst is prolonged at the same time.