96results about How to "Help to combine" patented technology

The invention discloses a sodium alginate-chitosan polyionic compound hydrogel and its 3D-printing preparation method. The compound hydrogel is the sodium alginate-chitosan polyionic compound hydrogelof which carboxylate radicals are crosslinked with ammonium ions, the biocompatibility is good, cell loss caused by material degradation in the cell culture process using hydrogel blocks can be effectively improved, and cells cultured on the materials easily obtain required oxygen and nutrient substances. The 3D-printing preparation method includes the following steps of preparation of a sodium alginate-chitosan polyionic compound solution and preparation of the sodium alginate-chitosan polyionic compound hydrogel. The sodium alginate-chitosan polyionic compound hydrogel is prepared by usingthe 3D-printing technology, the outside dimensions are controllable, pore structures which are visible in the macroscopic aspect and interconnected are obtained, combination between hydrogel materialsand tissue is easily achieved, and after material implantation, wear of materials at a tissue loss site is reduced.

The invention discloses a copper-based powder metallurgical pantograph sliding plate material taking spherical chromium powder as a strengthening phase and a preparation method thereof. The copper-based powder metallurgical pantograph sliding plate material taking the spherical chromium powder as the strengthening phase is prepared from the following components in percentage by mass: 75 to 85 weight percent of Cu, 1 to 10 weight percent of the spherical chromium powder, 1 to 5 weight percent of Pb, 5 to 10 weight percent of Sn, 1 to 5 weight percent of Ni, 0.5 to 2 weight percent of flake graphite and 0.5 to 2 weight percent of molybdenum disulfide. The copper-based powder metallurgical pantograph sliding plate material prepared by the invention has excellent mechanical properties, good wear resistance and self-lubricating performance, low resistivity, high strength and good arc extinguishing performance. The copper-based powder metallurgical pantograph sliding plate material providedby the invention is mainly used for power-taking elements of urban rail transit and low-speed heavy-duty locomotives.

The invention provides a prefabricated assembly type concrete wallboard and a connecting structure and a construction method thereof. The prefabricated assembly type concrete wallboard comprises a wallboard body, a plurality of vertically formed reinforcing steel bar through holes are formed in the wallboard body, and the reinforcing steel bar through holes are formed by metal corrugated pipes pre-buried before concrete is poured in a component factory. Pouring grooves are formed in the side edge of the wallboard body. Ribs are not exposed out of the four sides of the wallboard of a connectingstructure, field connection is divided into vertical connection and horizontal connection, the vertical connection is that steel bars are inserted into the pre-buried metal corrugated pipes, concreteis poured into the pre-buried metal corrugated pipes, and the vertical steel bars are in lap joint or welding or mechanical connection. The horizontal connection of the wallboard is that truss ribs are placed in the pouring grooves in the side edge of the wallboard, and the necessary vertical steel bars and horizontal steel bars are used as auxiliary materials. The ribs are not exposed on the four sides of the wallboard, and factory production is facilitated. The grouting-sleeve-free process for field connection is low in cost, reliable in connection and high in construction efficiency. The pouring grooves in the four sides of the wallboard and the post-poured concrete form a strong mechanical joint surface, and a good waterproof effect is achieved.

The invention discloses a carbon nano-tube/nano-silver soldering paste heat-conduction material and a preparing method thereof. A carbon nano-tube with the surface coated with silver is regarded as areinforced phase and doped in nano-silver soldering paste, so that nano-silver particles are effectively and uniformly adsorbed on the carbon nano-tube with the surface coated with silver. The heat-conduction material has the advantages of a high heat-conduction rate, high bonding strength, high shearing strength and the like; besides, by means of the carbon nano-tube/nano-silver soldering paste heat-conduction material and the preparing method thereof, the defect that the interface bonding capability between the carbon nano-tube and the nano-silver particles is weak is overcome, and the preparing technology is simple.

The present invention relates to nano composite carbon/chromium trioxide powder and its preparation. Polyaniline is oxide with hexad chromium compound to form the mixture precipitate of polyaniline and chromium hydroxide; the mixture precipitate is washed and dried to obtain nano composite polyaniline/chromium hydroxide powder; and under air isolating condition, the nano composite polyaniline/chromium hydroxide powder is heated to high temperature to obtain the nano composite carbon/chromium trioxide powder with carbon coating the nano chromium trioxide particle. The nano composite carbon/chromium trioxide powder of the present invention has small particle size and raised use effect as antiwear additive and is suitable for large-scale production.

The invention provides an anti-staining epoxy fire-retardant coating and a preparation method thereof. The fire-retardant coating is prepared by mixing a component A and a component B, wherein the component A is prepared by the following ingredients of, by weight, 40-45% of a water-borne epoxy resin, 15% of modified ammonium polyphosphate, 6-8% of trimeric cyanamide, 6-8% of pentaerythritol, 3-7% of nano TiO2, 3-5% of nano silica, 3-7% of an organic silane coupling agent, 10-15% of brucite fibers and a proper amount of water, a total weight percentage of all the ingredients of the A component is 100%; and the component B is a curing agent accounting for 10% of the weight of the water-borne epoxy resin. The anti-staining epoxy fire-retardant coating prepared by the method has the functions of water-based environment protection, good anti-staining performance, capacity for resisting water immersion for a long time and long fire endurance. The anti-staining epoxy fire-retardant coating can not only resist stains and prevent fire, and has the function of sound absorption.

The invention relates to the technical field of concrete, and particularly discloses lightweight high-strength foam concrete and a preparation method thereof. The lightweight high-strength foam concrete is prepared from the following raw materials in parts by weight: Portland cement and modified polypropylene fibers, and the modified polypropylene fiber is prepared from the following raw materials in parts by weight: a dibenzoyl peroxide solution, polypropylene fiber and a maleic acid solution. The preparation method of the lightweight high-strength foam concrete comprises the following steps: adding dibenzoyl peroxide into a xylene solution to prepare a mixed solution; adding polypropylene fibers into the mixed solution, performing swelling firstly, and then performing a reaction; then adding a maleic acid aqueous solution, and performing reacting to obtain a reaction crude product; drying the crude product to obtain modified polypropylene fiber; and mixing cement and water, then adding the modified polypropylene fiber and the additive, and performing stirring to obtain the cement slurry. The method can be used for improving the interface bonding performance of the polypropylene fiber and the cement matrix, and has the effect of improving the concrete strength.

The invention discloses a manufacturing and firing method of jun porcelain ancient egg-shaped and holed wind instrument. The method comprises the following steps: preparing clay, preparing a blank, biscuit firing, glazing, sintering, and detecting sound. Raw materials for preparing the clay consist of the following components in parts by weight: 40 to 50 parts of kaolin, 5 to 10 parts of alkaline stone, 10 to 15 parts of knot clay, 5 to 10 parts of quartz sand, 0.5 to 1 part of vermiculite, 1 to 2 parts of plant ash, 1 to 2 parts of sodium alginate, and 0.5 to 1 part of phenolic resin powder. A gradually heating multi-sectional heating way is adopted both in the biscuit firing process and the sintering process, so that the blank is slowly heated, the heating non-uniformity and stress change caused by the sudden change of the temperature can be avoided, so that cracks and crease on the surface of the jun porcelain ancient egg-shaped and holed wind instrument can be avoided, and the artistic ornamental value of the jun porcelain ancient egg-shaped and holed wind instrument can be improved; and moreover, the jun porcelain ancient egg-shaped and holed wind instrument fired by the invention is rigid in structure and unlikely to crack, the sound produced by the instrument is strong and ebb and flow, steady and dense and has penetration powder, and the playing requirement of the porcelain jun ancient egg-shaped and holed wind instrument can be met.

The invention discloses a method for preparing mineral fiber printing paper with excellent printing applicability. According to the method, activated sepiolite and wollastonite are subjected to superfine crushing, so that superfine powder of a large length-diameter ratio can be prepared, crystal form protection can be facilitated, a mineral fiber has a relatively large specific surface area, excellent adsorption properties for printing ink are achieved, and then the paper has excellent printing applicability; in addition, the mineral fiber is coated by modified starch, so that packing can be well combined with a plant fiber, the packing retention is improved, and the strength of paper is improved; the modified starch used in the method belongs to organic humidity control materials, is capable of regulating the relative humidity of a system in the paper making process and eliminating static electricity of paper, and has the advantages that paper shrinkage is reduced, and printing applicability is improved.

The invention discloses a biodiesel pour point depressant, belonging to the field of oil additives. The biodiesel pour point depressant is prepared from the following raw materials in percentage by mass: 50-70% of higher polymaleate-styrene-acrylamide, 10-15% of a surfactant and 15-40% of dimeric acid amide. A preparation method of the biodiesel pour point depressant comprises the following steps: firstly, adding higher polymaleate-styrene-acrylamide; then, adding the surfactant span and tween in sequence; and finally, adding dimeric acid amide to formulated amount, and sufficiently stirring and mixing to obtain a compound product, namely the biodiesel pour point depressant. The biodiesel pour point depressant disclosed by the invention can be used for promoting the solubility of the pour point depressant in oils and improving the low-temperature flowing property of the biodiesel.

The invention discloses a layered ceramic composite material based on silicon nitride, and a preparation method thereof, and belongs to the field of ceramic materials. The preparation method comprises: using silicon nitride, hexagonal boron nitride and molybdenum as raw materials, and using a mixture of Al2O3 and Y2O3 as a sintering aid; mixing various ceramic powders, grinding, screening, weighing the mixed powder and molybdenum powder, putting into a metal mold, and carrying out cold pressing to form a biscuit; and sintering at a temperature of 1750-1850 DEG C under a pressure of 25-35 MPa in a nitrogen atmosphere to obtain the silicon nitride-based layered ceramic composite material. According to the invention, the obtained silicon nitride-based layered ceramic composite material retains high hardness and has good toughness.

A wound dressing device comprising at least one layer (2) of silk fibroin nanofibers and an absorbent component (4); the layer of fibroin nanofibers contacts the wound of the user and helps in the healing process.

The invention belongs to the technical field of thermal insulation coatings, and particularly relates to a thermal insulation coating sprayed on the surface of Q235B steel under a high-temperature condition and a using method of the thermal insulation coating. The invention aims to solve the problems that the strength of the existing thermal insulation coating used for Q235B steel cannot meet theactual requirements, and the existing thermal insulation coating cracks and falls off along with the cooling and heating processes of the Q235B steel after being sprayed. According to the invention, light calcium carbonate and glass fibers are added into a common thermal insulation coating formula taking potassium silicate and glass beads as raw materials, so that the coating has a thermal expansion coefficient tending to be consistent with that of Q235B, and meanwhile, the strength of the coating is improved, so that the coating does not crack or fall off along with cooling and heating of theQ235B after being sprayed. The coating can be sprayed on the surface of scorching Q235B under the high-temperature operation condition when thermal equipment such as a cement kiln operates to be rapidly cured, and is tightly combined with the surface of steel.

The invention provides an insulator for a high-voltage power transmission line and a manufacturing method of the insulator. The insulator comprises an insulator body and two fixed parts, wherein the two fixed parts are arranged at two ends of the insulator body; multiple large umbrellas and small umbrellas are distributed around the surface of the insulator body along the length direction of the insulator body, and the large umbrellas and the small umbrellas are arranged at intervals; the insulator body is formed by firing a base material, a filling material and a pore-forming agent; the base material comprises kaoline, knar clay and quartz; the filling material comprises kyanite powder, activated aluminum oxide micro-powder and modified nanosilicon dioxide; and the pore-forming agent comprises silicon carbide powder, sodium bicarbonate and soda lime. The fired insulator body can be soaked in an inorganic or organic insulating material, so that air holes in the insulator body are filled with the insulating material and the electric breakdown resistance of the insulator body is further strengthened.

The invention relates to a fiber costume material with an antibacterial health function and a preparation technology of the fiber costume material. By preparation of hole functional fibers with high distribution density, most of nano silver metal particles can be distributed in holes in the surfaces of the fiber in an embedded manner, and only a small part of nano silver metal particles are attached to the surfaces of the fibers; therefore, in the long-time use process of the costume material, the nano silver metal particles are unlikely to fall off even if the costume material is repeatedly washed in water; furthermore, the oxidization action of silver is suppressed, and efficient and full use of noble metal raw materials is realized.

The invention relates to a method for increasing the diethylstilbestrol degradation rate of laccase. The method specifically comprises: combining ABTS and a laccase solution to form a laccase-ABTS medium solution, mixing the laccase-ABTS medium solution and a diethylstilbestrol solution in a reaction system, placing the mixture into a shaking incubator, carrying out a reaction for a certain time,and extracting diethylstilbestrol by utilizing ethyl acetate to terminate the reaction, so that the degradation of diethylstilbestrol is realized. According to the invention, the laccase-ABTS medium solution is prepared and used for degrading diethylstilbestrol, so that the diethylstilbestrol degradation rate of laccase is increased to 99.9% from original 44.5% so as to easily achieve the treatment of diethylstilbestrol sewage, and the method has practical application value in the field of sewage treatment.

The invention discloses an ultrasonic-assisted titanium silicalite molecular sieve modification method, and relates to the technical field of molecular sieve modification, and the modification methodcomprises the following steps: S1, mixing a silicalite molecular sieve raw powder mother liquor, a template agent and mesoporous silica in proportion, and then carrying out primary heating for alcoholremoval; then adding tetra-n-butyl titanate, the template, mesoporous silica and tetra-n-butyl titanate in a molar ratio of (33-42): (5.5-14.8): 1; and S2, after heating and alcohol removal, carryingout secondary heating and alcohol removal on the mixed solution to prepare a titanium-silicon gelling reaction solution, heating and crystallizing the titanium-silicon gelling reaction solution at the temperature of 170-195 DEG C for 55-65 hours, carrying out solid-liquid separation on the obtained solid-liquid mixture to obtain a raw powder mother solution and a solid, and washing, drying and roasting the solid, carrying out superfine grinding treatment after roasting, and filtering with a 80-mesh sieve to obtain titanium silicalite molecular sieve raw powder. The method is beneficial to combination of the metal salt and the titanium silicalite molecular sieve, and the catalytic oxidation activity is further improved.