15results about How to "Dense surface" patented technology

The invention belongs to the field of nano material preparation, and particularly relates to a preparation method of nanoscale silicon dioxide alcohol-soluble sol. The method comprises the following steps: dissolving a water-soluble polymer in an ammonia water solution, and then adding absolute ethyl alcohol to form a polymer micelle; adding tetraethyl orthosilicate into the micelles, obtaining a nanoscale silicon dioxide nanoparticle mixed solution after the reaction is finished, then dispersing the nanoscale silicon dioxide nanoparticle mixed solution in deionized water through centrifugation, then centrifuging to obtain pure silicon dioxide particles, dispersing the pure silicon dioxide particles in absolute ethyl alcohol, adding a silane coupling agent KH570 at the same time, and performing ultrasonic dispersion to obtain the nanometer silicon dioxide nanoparticles. And carrying out ultrasonic dispersion to obtain the nanoscale silicon dioxide alcohol-soluble sol.

The invention provides an aluminum-based composite material reinforced by nickel-coated silicon carbide through a magnetron sputtering dry method and a preparation process of the aluminum-based composite material, and relates to the technical field of metal-based composite materials and advanced electronic packaging thermal management materials. Comprising the following steps that S1, silicon carbide particles coated with nickel through a magnetron sputtering dry method and aluminum powder are put into a mold to be subjected to compression molding, and an initial blank is obtained; and S2, the initial blank prepared in the step S1 is placed in a re-pressing sintering furnace under the inert gas protection condition, continuous re-pressing is conducted under the temperature condition ranging from the temperature lower than the aluminum melting point by 50 DEG C to the temperature higher than the aluminum melting point by 200 DEG C, and the nickel-coated silicon carbide reinforced aluminum-based composite material obtained through the magnetron sputtering dry method is obtained. The aluminum-based composite material reinforced by magnetron sputtering dry nickel-coated silicon carbide disclosed by the invention is excellent in heat-conducting property and mechanical property and long in service life.

The invention relates to the field of coatings, and particularly discloses a two-component fireproof heat-insulating coating and a preparation method thereof. The coating provided by the invention comprises an agent A and an agent B, wherein the agent A comprises the following raw materials in parts by weight: 10-20 parts of bisphenol A epoxy resin, 40-50 parts of an intumescent flame retardant, 2-4 parts of glass fibers, 2-4 parts of needle-like wollastonite, 3-7 parts of fumed silica, 10-20 parts of a diluent, 0.3-0.5 part of a flatting agent and 8-15 parts of epoxy polyhedral oligomeric silsesquioxane modified glass fibers; the agent B is prepared from the following raw materials in parts by weight: 10 to 20 parts of polyamide curing agent, 10 to 15 parts of diluent and 7 to 10 parts of amino cage type polysilsesquioxane modified needle-like wollastonite. The coating disclosed by the invention is good in fireproof and heat-insulating effects and high in adhesive force.

The invention provides a method for preparing a metal fluoride film through low-temperature ALD, and the method comprises the steps: carrying out the plasma enhanced atomic layer deposition reaction of a metal precursor and oxygen plasma, and obtaining the metal fluoride film; the metal precursor is selected from hexafluoroacetylacetonate. According to the method, PEALD is utilized to prepare the metal fluoride film, fluorine-containing gas with extremely high corrosivity is not adopted, and the safety of film deposition is improved; and the preparation process is relatively low in temperature, environment-friendly, controllable in film thickness and easy to implement. The prepared metal fluoride film has the advantages of uniform film layer, compact surface and extremely low refractive index, can be uniformly deposited when being applied to an optical lens, and has shape retention. In addition, some high-refractive-index film layer structures can be matched to realize anti-reflection or anti-reflection performance in some specific spectral regions.

The utility model provides a rolling device of plastic extrusion production line, including: rolling device, clamping device and conveying device, rolling device includes: rolling frame, servo motor, hold-down mechanism and rolling mechanism, servo motor is on rolling frame, servo motor output end installs rolling mechanism, rolling mechanism can be rotatingly installed on rolling frame, the rolling mechanism is equipped with the clamping device, the clamping device is equipped with the conveying device. A conveying device is arranged on one side of the winding frame and comprises a guide rail, a movable bearing device, a blocking mechanism and an upward guiding assembly, a clamping device is installed above the movable bearing device and comprises a base, an installation rod and a supporting clamping mechanism, and the base is connected with the top of the movable bearing device through the installation rod. According to the winding device of the plastic extrusion production line, the accurate clamping action is achieved through the linkage shaft and the clamping arms, the opening and closing state of the clamping arms can be conveniently and rapidly adjusted through the design of the telescopic adjusting rods, and therefore plastic rolls are efficiently grabbed and released, and the stability of the plastic rolls in the transferring process is guaranteed.

The invention relates to a wave-transparent composite material with high surface flatness and low surface roughness and a forming method. The wave-transparent composite material comprises a fiber reinforced resin-based wave-transparent composite material main body layer, an ultrathin fiber cloth reinforced resin-based wave-transparent material transition layer and a thermoplastic film surface layer which are arranged in sequence. The forming method of the wave-transparent composite material comprises the following steps: sequentially laying the fiber reinforced resin prepreg (prepreg A), the ultrathin fiber cloth reinforced resin prepreg (prepreg B) and the thermoplastic polymer film on a mold, and then integrally hot-pressing, curing and forming. The wave-transparent composite material is compact and uniform in surface, high in flatness and low in roughness.

The invention relates to the technical field of damping materials, in particular to a core-shell structure foaming agent with ammonium bicarbonate coated with nano-silica and a water-based damping coating prepared from the core-shell structure foaming agent. The foaming agent with the core-shell structure is prepared from the following raw materials in parts by weight: 8-10 parts of nano silicon dioxide, 2-5 parts of ammonium bicarbonate, 1-3 parts of diatomite, 1-2 parts of a coupling agent, 0.5-1 part of polyvinylpyrrolidone, 0.5-1 part of epoxy chloropropane and 7-12 parts of absolute ethyl alcohol. The foaming agent with the core-shell structure realizes controllable thermal decomposition through a synergistic effect of chemical bonding and physical adsorption, and the water-based damping paint prepared by utilizing the foaming agent effectively avoids the defects of bubbles, pinholes or cracks and the like caused by concentrated release of gas in a film forming process of a coating due to a controllable and stable gas release mechanism; the high-quality coating which is smooth and compact in surface, free of bubble marks and excellent in damping vibration attenuation effect is obtained, and it is hopeful to achieve the same or better vibration attenuation effect by reducing the overall using amount of materials.

The invention provides a method for coating copper on the surface of a polymer, which is characterized in that a coarsening step and a copper plating step are carried out on the polymer, a copper plating solution is used in the copper plating step, and the copper plating solution comprises plant acid; therefore, the problems of low copper coating rate, low binding force between the copper layer and the polymer and the like in the traditional technology can be solved.

The invention relates to a method for preparing an Al-Y2O3 composite coating through electro-deposition, which is used for preparing the Al-Y2O3 composite coating by using Y2O3 particles as second-phase particles through an electro-deposition technology. The preparation method comprises the following steps: putting anhydrous AlCl3, LiAlH4 and Y2O3 particles into a glove box filled with argon, weighing 4g of anhydrous AlCl3 and 0.28 g of anhydrous LiAlH4 by using a balance, putting the anhydrous AlCl3 and the anhydrous LiAlH4 into a beaker, and then weighing a certain amount of Y2O3 particles (20g / L-80g / L) and putting the Y2O3 particles into the beaker; and the beaker is sealed, taken out and put into a fuming cupboard. The method comprises the following steps: measuring 20ml of benzene by using a measuring cylinder, pouring the benzene into a sealed beaker by using a guide tube, and then putting the beaker into a magnetic stirrer under an ice bath condition; 5 ml of tetrahydrofuran is measured and slowly poured into the beaker through the guide tube, and in order to prevent the tetrahydrofuran from deteriorating, the process needs to be carried out under an ice bath condition. And adding tetrahydrofuran, sealing the beaker, stirring for 2-3 hours, and carrying out ultrasonic dispersion for 30 minutes. According to the method, an aluminum sheet is used as an anode, a copper sheet is used as a cathode, the current density is controlled to be 30-50 milliamperes / cm < 2 >, the temperature of a plating solution is 20-40 DEG C, the electrodeposition time is 30-75 min, and the Al-Y2O3 composite coating with the compact surface and uniform particle distribution can be obtained, and the Al-Y2O3 composite coating mainly comprises Al and Y2O3.

And preparing the Al-MoS2 composite coating by adopting MoS2 as second-phase particles by utilizing an electro-deposition technology. The preparation method comprises the following steps: putting anhydrous AlCl3, LiAlH4 and MoS2 particles into a glove box filled with argon, weighing 4g of anhydrous AlCl3 and 0.28 g of anhydrous LiAlH4 by using a balance, putting into a beaker, and then weighing a certain amount of MoS2 particles (10g / L-80g / L) and putting into the beaker; and the beaker is sealed, taken out and put into a fuming cupboard. The method comprises the following steps: measuring 20ml of benzene by using a measuring cylinder, pouring the benzene into a sealed beaker by using a guide tube, and then putting the beaker into a magnetic stirrer under an ice bath condition; 5 ml of tetrahydrofuran is measured and slowly poured into the beaker through the guide tube, and in order to prevent the tetrahydrofuran from deteriorating, the process needs to be carried out under an ice bath condition. And adding tetrahydrofuran, sealing the beaker, stirring for 2-3 hours, and carrying out ultrasonic dispersion for 30 minutes. According to the method, an aluminum sheet serves as an anode, a copper sheet serves as a cathode, the current density is controlled to be 30-50 milliamperes / cm < 2 >, the temperature of a plating solution is 20-40 DEG C, the electrodeposition time is 30-75 min, and the Al-MoS2 composite coating with the compact surface and uniform particle distribution can be obtained and mainly comprises Al and MoS2.

This application relates to the field of concrete technology, specifically disclosing a fair-faced concrete and its preparation method. The raw materials for fair-faced concrete include cement, fly ash, mineral powder, glass powder, sand, reinforcing coarse aggregate, water, water-reducing agent, defoamer, and pumping agent; the preparation method is as follows: (1) cement, fly ash, mineral powder, glass powder, sand, and reinforcing coarse aggregate are added to a mixer and mixed evenly; (2) water, water-reducing agent, defoamer, and pumping agent are added to the mixer and mixed evenly to obtain fair-faced concrete. The fair-faced concrete of this application has the characteristics of high strength and high fluidity. Therefore, the vibration step is omitted during the construction and pouring process, greatly shortening the construction cycle, reducing the possibility of operational errors, and reducing rework costs.

In the field of electrode construction in the alkaline water electrolysis hydrogen production industry, a catalytic electrode prepared by an existing method has the problems of poor activity, poor stability and the like. The invention discloses a preparation method of an alkaline water hydrogen evolution electrode with flat and compact surface appearance. The method comprises the following steps: (1) preparing a compact catalyst precursor on the surface of a current collector in a pulse electroplating manner; (2) densification treatment; (3) constructing an active substance catalytic layer by electrochemical ultrashort pulse; and (4) carrying out secondary annealing to finally prepare the high-activity and high-stability electrolytic water gassing catalytic electrode.

The application relates to the technical field of ceramic materials, and discloses a preparation method of a high-temperature ablation-resistant (Hf-Zr-Nb)C ternary carbide entropy ceramic. First, HfO2, ZrO2, Nb2O5 and C powder are mixed and then heat-treated in a high-temperature heat treatment furnace to prepare (Hf-Zr-Nb)C entropy ceramic powder by using a carbothermic reduction reaction; then the powder is pressed to obtain a ceramic block; finally, the ceramic block is sintered by using a pressureless sintering device to obtain the (Hf-Zr-Nb)C ternary carbide entropy ceramic. Compared with the existing precursor impregnation and pyrolysis and discharge plasma sintering densification technology, the pressureless sintering technology is simple in process, can greatly reduce the production cost, and can improve the yield. The entropy carbide ceramic block has good ablation resistance. The application provides technical support for the application of the high-temperature ablation-resistant entropy carbide ceramic material to the hot end components of space-aircraft.

And the Al-SiC composite coating is prepared by using SiC as second-phase particles through an electro-deposition technology. The preparation method comprises the following steps: putting anhydrous AlCl3, LiAlH4 and SiC particles into a glove box filled with argon, weighing 4g of anhydrous AlCl3 and 0.28 g of anhydrous LiAlH4 by using a balance, putting into a beaker, and then weighing a certain amount of SiC particles (20g / L-80g / L) and putting into the beaker; and the beaker is sealed, taken out and put into a fuming cupboard. The method comprises the following steps: measuring 20ml of benzene by using a measuring cylinder, pouring the benzene into a sealed beaker by using a guide tube, and then putting the beaker into a magnetic stirrer under an ice bath condition; 5 ml of tetrahydrofuran is measured and slowly poured into the beaker through the guide tube, and in order to prevent the tetrahydrofuran from deteriorating, the process needs to be carried out under an ice bath condition. And adding tetrahydrofuran, sealing the beaker, stirring for 2-3 hours, and carrying out ultrasonic dispersion for 30 minutes. And an aluminum sheet is used as an anode, a copper sheet is used as a cathode, the current density is controlled to be 30-50 mA / cm < 2 >, the temperature of the plating solution is 20-40 DEG C, the electro-deposition time is 30-75 min, and the Al-SiC composite coating with the compact surface and uniform particle distribution can be obtained, and the Al-SiC composite coating mainly comprises Al and SiC.

The application discloses a multifunctional color early-strength frequency-modulated molding mortar suitable for a DIY scene and a preparation method thereof, and belongs to the technical field of building materials, which comprises sulphoaluminate cement, machine-made sand, metakaolin, redispersible latex powder, water reducing agent, early-strength agent, suspension stabilizer, inorganic pigment, cellulose ether, defoaming agent, and the rest is water. The application adopts the multifunctional early-strength frequency-modulated molding mortar suitable for the DIY scene and the preparation method thereof, and realizes the super-early-strength performance through the cooperation of the sulphoaluminate cement and the early-strength agent, utilizes the physical-chemical cooperation of the redispersible latex powder and the metakaolin to make the hardened surface dense and smooth, the powder cannot be scraped off by a nail, and the migration of alkaline substances is blocked, thus preventing the efflorescence phenomenon, and the operable time is controlled within 30-60 minutes, which avoids the too fast invalidation and takes into account the early-strength development, and solves the problems of a long maintenance period, water sensitivity, powder dropping and efflorescence of a finished product and single color of the traditional DIY cement.