2599results about How to "Improve densification performance" patented technology

The invention discloses a preparing method of a bamboo fiber winding composite tube. The existing polyvinyl chloride tubes, polyethylene tubes, glass steel tubes and glass steel sand tubes consume a great amount of petroleum resources, and pollute environments. The invention provides the preparing method of the bamboo fiber winding composite tube. The preparing method comprises the following steps: preparing an inner liner layer; pre-treating bamboo fiber, connecting the bamboo fiber into a continuous bamboo fiber strip by a method of liner cloth adhesion or sewing or weaving, and rolling the bamboo fiber strip into a roll; preparing a reinforcing layer, installing the coiled bamboo fiber strip on a winding machine to unwind, coating resin on the bamboo fiber strip through a resin tank, winding the bamboo fiber strip on an inner liner layer of a straight tube mould more than two circles, and forming the reinforcing layer after curing; preparing an outer protective layer. The preparing method uses the winding machine to perform the machine production, so the production efficiency is high, the compactness of the bamboo fiber is enhanced, and the strength of the product is enhanced.

The invention discloses a lightweight high-performance foam concrete, which is composed of the following components in parts by weight: 50 to 60 parts of cement, 20 to 35 parts of mineral slag, 15 to 20 parts of fly ash, 5 to 10 parts of gypsum, 60 to 80 parts of fine aggregate, 2.7 to 7.3 parts of additive, 0.1 to 0.2 part of fiber, 32 to 45 parts of water, and 5 to 25 parts of foam. The invention also discloses a preparation method of the foam concrete. The foam concrete has the advantages of small volume-weight, high strength, low water absorption, and small contraction rate, and has the waterproof and anti-cracking functions at the same time.

The invention relates to a water-based primer-topcoat braking paint and a preparation method thereof. The braking paint comprises the following materials by weight percentage: 30-40 of water-based acrylic resin, 2-10 of amino resin, 1-3 of neutralizing agent, 2-5 of compound rustproofing pigment, 1-3 of tinting pigment, 10-20 of filling agent, 0.1-0.5 of defoaming agent, 0.1-0.5 of flatting agent and 25-40 of deionized water, wherein the water-based acrylic resin is a free radical polymerization resultant which comprises the following materials by weight percentage: 10-30 of monomer containing hydroxy acrylic acid, 5-20 of monomer containing carboxyl acrylic acid, 2-8 of internal crosslinking monomer, 20-40 of other acrylic acid monomer, 15-30 of phenyl ethylene monomer, 1-5 of evocating agent and 40-50 of alcohol ether latent solvent. When the paint is prepared, the dispersion and the abrading condition of the pigments and the filling agents are reasonably controlled to ensure that each component of the paint fully plays the respective function. The paint ensures the corrosion prevention effect and the decoration of a coating and realizes the combination of a primer and a topcoat.

The invention discloses an organosilicon modified silica sol/polyacrylate composite emulsion and its preparation method. The emulsion comprises the following raw materials, by mass, 30-55 parts of deionized water, 20-65 parts of a modified silica sol, 2-15 parts of a core acrylate monomer, 20-60 parts of a shell acrylate monomer, 0.1-3.0 parts of organosilicon, 0.1-2.5 parts of an emulsifier, 0.02-1.5 parts of an initiator, and 0.01-2.0 parts of sodium bicarbonate, wherein the Si (by SiO2) content in the organosilicon modified silica sol/polyacrylate composite emulsion is 15-25% by mass. The emulsion which has an excellent appearance is a white emulsion with obvious blue lights. A coat of the emulsion is transparent and smooth, and has a hardness reaching 5-6H and an adhesion being 0-1 level. The coat has an excellent water resistance, so the coat does not have whitening and foaming phenomena after immersed in water for 7-10 days; the coat has no changes after resisting neutral salt fog for 15-20 days; and the solvent wiping resistance of the coat can pass an MEK test 180-200 times.

The invention relates to a building material, and in particular relates to an exterior wall color surface decoration mortar and a preparation method thereof. The exterior wall color surface decoration mortar comprises the following raw materials by weight: 20%-30% of white cement, 50%-60% of quartz sand, 0.1%-0.5% of chopped fiber, 10%-20% of heavy calcium carbonate, 0.2%-1% of latex powder, 0.3%-0.5% of cellulose ether, 1%-5% of an inorganic pigment, 0.2%-0.4% of a water repellent, 5%-10% of coal powder ash, 0.1%-0.15% of a defoaming agent, 1%-3% of metakaolin, 0.2%-0.5% of a thixotropic lubricant and 1%-2% of a water reducing agent. The exterior wall color surface decoration mortar has the advantages of crack resistance, weather resistance, good ultraviolet resistance, permanent and uniform color, good whiskering resistance, and the like, can be well combined with various inorganic base layer materials, is good in coating density, and can be widely used in the building fields such as exterior wall decoration and the like.

The invention discloses a preparation method of essence microcapsules. The preparation method comprises the following steps: (1) dissolving chitosan in acetum; (2) adding emulsifier and essence into the chitosan acetum for high-speed emulsification and dispersion to obtain the chitosan essence emulsion; (3) adding the mixed solution of sodium alginate and sodium tripolyphosphate dropwise into the chitosan essence emulsion; (4) adjusting the pH value of the system to 5-7 with NaOH solution to obtain the condensed essence microcapsules; and (5) adding cross-linking agent into the condensed essence microcapsule system to perform chemical cross-linking process on the condensed essence microcapsules to obtain the essence microcapsules. For the essence microcapsules prepared according to the method disclosed by the invention, as chemical cross-linking process is implemented on the walls of the capsules, the density of the capsule walls and the resistance to the solution alkalinity/acidity are improved, and the application stability of the essence microcapsules is increased; moreover, with small size, the capsules can easily permeate into textile fiber, and the water-washing resistance of the textile fiber is greatly improved.

The invention relates to a composite bonding wear-resistant castable refractory, which can be used for high-temperature kiln engineering. The amorphous castable refractory which is normal in coagulation, quick in hardening, low in porosity, high in strength and high in abrasive resistance is prepared from silica sol serving as a bonding agent, aluminate cement serving as a curing agent, alumina micro powder and wollastonite which serve as a compact agent, heat resistant steel filters serving as a reinforcing agent and corundum and alumina which serve as an aggregate. The composite bonding wear-resistant castable refractory is suitable for positions such as air pipeline elbows for the cogeneration of cement kilns, cyclone cones and linings for triple air pipe gates which are easy to wear in high-temperature kilns.

The invention discloses an additive manufacturing device composite powder compacting and spreading device and method. The powder spreading device comprises a pressure powder spreading machine and a vibration system, wherein the pressure powder spreading machine is provided with a coating surface with a certain inclined angle and used for spreading a powder material, and the vibration system is used for vibrating and compacting the spread powder material. According to the powder spreading device, due to the fact that the pressure powder spreading machine is provided with the coating surface with the certain inclined angle, in the powder spreading process, after loose powder enters the included angle formed between the coating surface and a powder spreading plane, the heated loose powder is mutually extruded through the gradually-decreasing space, and then gaps between the powder become smaller; the vibration system vibrates and pressurizes the extruded powder, distribution arrangement of the gaps between the extruded powder is stabilized, namely, rebound of the spread powder is reduced, the powder material is elastically deformed and then the flat-spread powder is compacted, so that compactness of three-dimensional forming products is improved, and mechanical performance of the three-dimensional forming products is further improved.

The invention relates to a coating method for iron-based magnetically soft alloy powder and a preparation method of soft magnet composite material. The coating method for iron-based magnetically soft alloy powder comprises the following steps: carrying out accelerated oxidation on iron-based magnetic metal powder at high temperature, forming an oxide layer on the surface of the powder and then carrying out acid pickling, thus obtaining powder with surface coated with SiO2, Al2O3 and Cr2O3 oxides. The preparation method of the soft magnet composite material comprises the following steps: adding coupling agent, silicon resin and lubricating agent to the coated powder, carrying out pressing forming, and then carrying out annealing heat treatment, thus obtaining the soft magnet composite material. According to the invention, the advantage that an oxide produced in reaction of elements including Si, Al and Cr contained in the iron-based magnetically soft alloy powder with oxygen is high in electrical resistivity, small in thermal expansion coefficient and steady in chemical performance and can resist high temperature is fully utilized; the adopted coating technology is to produce a coating layer in situ on the surface of the alloy magnetic powder, and is simple in process, easy to operate and low in cost; the metal soft magnet composite material prepared by adopting the method disclosed by the invention has good magnetic property and frequency stability.

A 3D printing device integrating material supplying, fluxing and crystal leveling assistance comprises a support, a material bin, a first forced feeding mechanism, a second forced feeding mechanism, an auxiliary heating head and a crystal leveling assistance vibrating head, wherein the material bin, the first forced feeding mechanism, the second forced feeding mechanism, the auxiliary heating head and the crystal leveling assistance vibrating head are all mounted on the support. The material bin, the first forced feeding mechanism and the second forced feeding mechanism are sequentially connected. A nozzle is connected to a discharging outlet of the second forced feeding mechanism, and a heating device is arranged at the discharging outlet. The auxiliary heating head and the crystal leveling assistance vibrating head are arranged at the bottom of the support and located in front of and behind the nozzle respectively. The device is easy to operate, stable, reliable and convenient to maintain; the compactness of formed workpieces in the 3D printing process is improved, interlayer bonding of the formed workpieces is good, and the cost is low; through material selection, size changes and process adjustment of corresponding components, the device can be suitable for fused deposition of powder materials of different types.

The invention discloses a silicon and fluorine-containing epoxy (meth) acrylate UV-curing composite coating, comprising the following ingredients of: epoxy (meth) acrylate, polyhedral iligomeric silsesquioxane, fluorine-containing (meth) acrylate, an active diluent monomer, a photoinitiator and an auxiliary agent. Such a composite coating, with excellent fouling resistance, corrosion resistance, weather resistance, abrasive resistance, water resistance, fouling resistance and dynamic performance, is an environmentally friendly coating which is suitable for building material, optical fiber wrapping and the coating of the surface of metal element.

The invention relates to a sintered composite soft magnetic material and a method for preparing the same. The material comprises a metal soft magnetic material, a soft magnetic ferrite and a low-melting-point soft magnetic alloy, wherein the metal soft magnetic material is formed by at least one of an Fe-Ni system, an Fe-Co system, an Fe-Co-V system, an Fe-Al system and an Fe-Al-Me system (Me is one or more than two of Co, Cr and Mo), the soft magnetic ferrite is formed by at least one of an Mn-Zn system, an Ni-Zn-based, an Li-Zn system and a Cu-Zn system, and the low-melting-point soft magnetic alloy is an Re-Fe-M system alloy (Re comprises one or more of 17 rare earth elements including Sc and Y, and M is one or more of metal elements including B, Al, Si, Ti, V, Cr, Mn, Co, Cu, Mo, Ni, Zn, Ga, Nb, Ta and W). The method for preparing the soft magnetic material formed by the components has the advantages that cold pressing and then sintering or hot pressing or spark plasma sintering are selected, and the soft magnetic material not only overcomes the low resistivity of the metal soft magnetic material and the low magnetic induction of the ferrite, but also maintains the excellent performance of the metal soft magnetic material and the soft magnetic ferrite.

The invention discloses a novel graphite composite grounding material and a preparation method thereof. The novel graphite composite grounding material is in the shape of a rope or stranded wire, and comprises a composite graphite yarn inner core and a composite graphite yarn knitted layer wrapped outside the composite graphite yarn inner core, wherein the composite graphite yarn inner core is a composite graphite yarn bundle composed of a plurality of first composite graphite yarns or a single first composite graphite yarn; each first composite graphite yarn is prepared by twisting a first composite graphite belt; the composite graphite yarn knitted layer is prepared by knitting a second composite graphite yarn; and the second composite graphite yarn is prepared by twisting a second composite graphite belt. The graphite composite grounding material disclosed by the invention has the advantages of corrosion resistance, favorable conductivity, high flexibility, low price, precise soil association and the like, and is easy for transportation; since the price is low, artificial theft destroy can be avoided; and the graphite composite grounding material is suitable for the fields of transformer stations, overhead transmission line towers, tall buildings and all other projects in need of electric grounding.

The invention relates to a stainless heat-resistant alloy steel seamless steel tube and a preparation method thereof. The seamless steel tube comprises the following chemical compositions by weight percent: 0.04-0.10% of C, 0.75% or less of Si, 2.00% or less of Mn, 0.03% or less of P, 0.03% or less of S, 17.00-23.00% of Ni, 24.00-26.00% of Cr, 0.20-0.60% of Nb+Ta, 0.15-0.35% of N and the balance Fe and inevitable trace elements. The preparation method of the invention adopts hot extrusion and cold rolling, computer automatic control solution heat treatment and other advanced technologies. Theproduct of the invention has excellent mechanical performance, high temperature resistant and corrosion resistance and various technical indexes of the product all meet or exceed Chinese relevant technical standards, thus successfully providing a new kind of qualified tube for the ultra supercritical power station boiler.

The invention relates to a preparation method of nano silicone-acrylate core shell type composite latex for latex paints. The preparation method solves the problem that latex paints prepared from the common latex is insufficient to meet the demands of people at the performance aspects of water resistance, weather resistance, pollution resistance and the like, and simultaneously reduces the restraint degrees of a region domain and a time and season domain for latex construction. In the preparation method, active organic silicon and acrylate monomers are mainly used as raw materials, and then the nano silicone-acrylate core shell type composite latex using polyacrylate as a core and using silicone-acrylate composite resin as a shell is synthesized by adopting a monomer pre-emulsifying process and a seed semi-continuous latex polymerization method, so that the preparation method has the advantages of stable polymerization process and convenient large-scale production. When used for preparing the latex paints of outer walls, the synthesized latex can greatly improve all performance of the latex paints, also solve the conflicts between the lowest film-forming temperature and film hardness and simultaneously realize the unification of the cost and the performance.

The invention relates to a preparation method of a silicon carbide nanowire enhanced C/C-SiC-ZrB2 ceramic-based composite material. A pretreated carbon fiber prefabricating body is thermally treated to obtain a silicon carbide nanowire. The silicon carbide nanowire prepared by a sol-gel carbon-thermal reaction method is evenly distributed at the inner part of a porous carbon/carbon composite material. Subsequently, pyrolytic carbon deposited in an isothermal chemical vapor deposition furnace is coated at the surface of the silicon carbide nanowire, thus the dropping, growing and rupture of the silicon carbide nanowire in the following reaction and infiltration processes are effectively avoided. A ceramic-based composite material carbon fiber, a silicon carbide nanowire and a pyrolytic carbon middle layer after reaction and infiltration are not eroded by a high-temperature metal bath and are well preserved; thus the physical performance of the composite material can be improved. Compared with the C/C-SiC-ZrB2 ceramic-based composite material without adding the silicon carbide nanowire, the bending strength and the fracture toughness property of the silicon carbide nanowire enhanced C/C-SiC-ZrB2 ceramic-based composite material are improved by 26.9-41.3% and 45.2-59.1% respectively.

The invention relates to preparation of a nitrogen-phosphorus expanded type flame retardant and a method for application in preparing an aqueous polyurethane coating. The method comprises the following steps: mixing dimethyl phosphate, and alkali catalysts, namely sodium methoxide and acrylamide, performing a reaction so as to obtain an intermediate, adding a charcoal formation agent and a substance A, keeping the pH value of the solution to 6.5-7.0 in the stirring process, further adding a substance B and a substance C, performing a continuous stirring reaction, and performing concentration so as to obtain the nitrogen-phosphorus expanded type flame retardant; and preparing the aqueous polyurethane coating from the nitrogen-phosphorus expanded type flame retardant. By adopting the flame retardant provided by the invention, flame can be rapidly choked, and the flame retardancy of the nitrogen-phosphorus expanded type flame retardant can be improved by releasing smoke, controlling flamecombustion time and controlling densities of charcoal layers. In addition, the nitrogen-phosphorus expanded type flame retardant is grafted with polyurethane, so that the flame retardancy of the polyurethane can be further improved.

The invention relates to a method for deep penetration laser welding of a plate under the assistance of ultrasound. The method is characterized by comprising the following steps that firstly, first base metal (10) and second base metal (11) are machined to form butt joint end faces, and a series of inclined semicircular grooves are machined; secondly, the first base metal (10) and the second base metal (11) are in butt joint and are clamped, and a series of inclined blind holes are formed in a weld bead; thirdly, a first ultrasonic amplitude-changing rod (3) is pressed to the upper surface of a workpiece to be welded; fourthly, a second ultrasonic amplitude-changing rod (4) is fixed to one side of a laser welding head; fifthly, an ultrasonic generation device is started, the ultrasonic frequency is adjusted; sixthly, a laser beam (5) perpendicularly irradiates the upper surface of the workpiece, and the welding process is completed under continuous ultrasonic vibration; and seventhly, after welding is completed, ultrasonic vibration is maintained for 1-2 minutes. In the method, due to the pre-formed inclined blind holes and ultrasonic vibration, weld joint root leakage caused by molten pool downward flowing driven by local evaporation back flushing pressure of the front edge walls of the small holes is avoided.

The invention relates to a concrete gel reducing agent which comprises the following formula components in percentage by weight: 1%-3% of phosphonic acid ramifications A, 2%-5% of hydroxy aromatic compounds B, 8%-13% of alkylamine C and the balance of water, wherein the total amount of the phosphonic acid ramifications A, the hydroxy aromatic compounds B and the alkylamine C is 15%. A part of organic substances contained in the concrete gel reducing agent used as a novel concrete additive have molecular structures with three-dimensional spaces and have higher micro dispersion property on cement. If the gel reducing agent is doped into concrete, cement particles are sufficiently refined under the condition that the usage amount of the cement is reduced, the initial flowing property of the concrete is improved, and the hydration degree of a cement mineral is enhanced by promoting the hydration of ferrite which is more difficult to hydrate, so that the early strength is enhanced, the later strength of the cement is effectively excited and the compactness of the concrete is enhanced.

The invention relates to a deepwater cementing low-temperature early strength agent. The low-temperature early strength agent comprises the following components in percentage by weight: 33 to 66 percent of alkali metal bromides, 6 to 16 percent of sodium metaaluminate, 15 to 35 percent of alkali metal hydroxides, 8 to 15 percent of silicon dioxide and 0.8 to 1.5 percent of alcamines organics, wherein the alkali metal bromides are a mixture of one, two or more of NaBr, KBr and LiBr; the alkali metal hydroxides are NaOH, KOH or a mixture of the NaOH and KOH; and the alcamines organics are triethanolamine, triisopropanolamine or a mixture of the triethanolamine and triisopropanolamine. The deepwater cementing low-temperature early strength agent has small influence on rheological behaviour of cement paste at low temperature, can prompt the cement paste to be solidified rapidly at low temperature and reach higher early strength, shortens the thickening time of the cement paste at lower temperature and can well meet the requirements of the cementing construction of a surface casing under the conditions of low temperature, shallow gas and the like.

The invention relates to alloy cathode foil which is special for capacitors and produced by a continuous roll casting method, and the alloy cathode foil is characterized in that the foil comprises the following chemical components by mass fraction: 0.10-0.20% of Si, 0.46-0.50% of Fe, 0.14-0.18% of Cu, 0.9-1.0% of Mn, 0.01-0.05% of Mg, not more than 0.01% of Zn, not more than 0.05% of Ti, and the balance of Al. The preparation method comprises the following steps: a. producing a roll-casting roll; b. rolling the roll-casting roll, that is, roll-casting a 7.5 mm roll-casting plate into 5.0 mm, performing uniform annealing, roll casting to orderly obtain a dimension of 2.5 mm, 1.25 mm, 0.7 mm, and 0.5 mm, performing intermediate annealing, roll casting to orderly obtain a dimension of 0.24 mm, 0.15 mm, 0.09 mm, and 0.062 mm so as to obtain the finished product. The method shortens the production flow, and simplifies the production process, and the obtained aluminium foil has good quality.