117results about How to "Improve interfacial bond strength" patented technology

The invention discloses a high-flexibility winding-resistant robot cable, and relates to the technical field of robot cables, the robot cable comprises a plurality of cable cores, the cable cores are wrapped by a belting layer, a twisting gap of the cable cores is filled with a filler, the belting layer is wrapped by a shielding layer, and the shielding layer is wrapped by an outer sheath layer; the outer sheath layer is prepared from the following components: 80-100 parts of PVC resin, 30-60 parts of nitrile rubber powder, 20-30 parts of a polyolefin thermoplastic elastomer, 10-30 parts of trioctyl trimellitate, 5-15 parts of dioctyl sebacate, 5-25 parts of aluminum hydroxide, 8-15 parts of carbon black, 10-20 parts of modified carbon fiber, 3-6 parts of a heat stabilizer, 1-3 parts of an antioxidant and 1-3 parts of a lubricant; optimized balance of flexibility, bending resistance, mechanical strength and environmental adaptability is achieved, and a high-performance and long-service-life key component is provided for modern industrial automation and robot application.

The invention relates to a biodegradable high-strength medical soft tissue adhesive as well as a preparation method and application thereof. The medical soft tissue adhesive comprises a soft segment, a hard segment and a hard segment chain extender, the soft segment is a polyethylene glycol polymer; the hard segment is isocyanate; the hard segment chain extender comprises a hard segment electrically neutral chain extender and a hard segment ionized chain extender; the molar ratio of the polyethylene glycol polymer to the isocyanate to the hard segment electrically neutral chain extender to the hard segment ionized chain extender is (1-7): (50-95): (14-20): (2-6). The preparation method comprises the following steps: mixing the polyethylene glycol polymer, the hard segment chain extender and the isocyanate, heating and reacting to obtain a mixed reaction system; cooling after the reaction is completed, adding a rheology modifier, a foaming catalyst and a stabilizer into the mixed reaction system, and uniformly mixing to obtain the biodegradable high-strength medical soft tissue adhesive which is suitable for functional composite materials.

The invention discloses a high-performance special ceramic material and a preparation process thereof, and the preparation process comprises the following steps: proportioning tungsten carbide, ternary boride, titanium nitride, molybdenum, nickel, silicon, cobalt and other raw materials with nano silicon carbide whiskers according to a ratio, carrying out ball milling treatment, adding a forming agent, and continuing ball milling and granulation; and then, carrying out compression molding on the ceramic powder, carrying out liquid phase sintering in a CO atmosphere, and cooling to room temperature to obtain the high-performance special ceramic material. The Mo3NiB3 ternary boride is introduced, so that the hardness and impact resistance of the ceramic material can be improved, the interface bonding force between a ceramic matrix and a reinforcing phase is enhanced, and the bending strength is improved; the nano silicon carbide whiskers are subjected to nickel plating treatment, so that the interface bonding force can be improved, microcracks are reduced, and the strength and toughness of the ceramic material are enhanced; by optimizing the sintering process and adopting a staged heating mode, grain growth can be controlled, and the density and mechanical properties of the ceramic material are effectively improved.

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 technical field of composite materials, in particular to a long glass fiber reinforced plastic preparation process autonomous regulation and control method based on image vision, which comprises the following steps: judging the color difference interval of glass fiber and a standard sample, and judging whether floating fiber exists in colloidal particles or not according to the color difference interval; judging whether the floating fiber condition is in a first floating fiber degree or a second floating fiber degree according to the floating fiber ratio; in the first fiber floating degree, judging that the fiber floating reason is insufficient and non-uniform impregnation according to the diameter difference between the material diameters; judging whether the equipment parameters are in a preset range, and adjusting the equipment parameters; in the second floating fiber degree, the deviation condition is judged according to the diameter difference value of the materials; and judging whether the offset degree is a first category or a second category according to the offset, analyzing the offset trend, and adjusting the proportion or traction force of the polypropylene resin. By performing image view analysis on the colloidal particles prepared from the long glass fiber reinforced plastic, the reason of fiber floating is judged, and the preparation process is correspondingly regulated and controlled.

The invention discloses a glass fiber reinforced nylon material with high alcoholysis resistance, and relates to the technical field of glass fiber reinforced nylon materials. Raw materials of the high-strength and high-toughness composite material comprise the following components in parts by weight: 30-43 parts of PA46, 20-25 parts of PA66, 15-7 parts of PA115, 3-5 parts of bio-based nylon, 20-45 parts of alkali-free glass fibers, 1-3 parts of polyethylene, 0.5-3 parts of an antioxidant, 0.2-3 parts of a heat stabilizer, 0.1-5 parts of a compatilizer, 1-5 parts of a flexibilizer, 0.2-0.5 part of a hydrolysis-resistant agent, 1-2 parts of an ultraviolet light absorber, 0.1-2 parts of a silane coupling agent, 0.1-0.5 part of a nucleating agent, 1-5 parts of hollow glass beads and 3-8 parts of mica. The glass fiber reinforced nylon material is prepared by mixing the raw materials according to the set proportion and sequence, the glass fiber reinforced fiber material with high alcoholysis resistance is finally obtained, a small amount of mica is added into the matrix raw materials, the insulativity and heat resistance of the prepared glass fiber reinforced nylon material are improved to a certain extent, and the service life of the glass fiber reinforced nylon material is prolonged. The range of products made of the material is expanded, the stability of the products is improved, and the products can resist corrosion of strong acid and strong alkali.

The invention provides a lightweight insulation composite cross arm. The lightweight insulation composite cross arm comprises an insulation core rod, a filler filled in the insulation core rod and an insulation umbrella skirt located outside the insulation core rod, the structure of the insulating core rod is a pipe body formed by modified continuous basalt fibers which are spirally arranged in multiple layers, and resin is adhered to the surfaces of the modified continuous basalt fibers; the structure of the modified continuous basalt fiber is as follows: basalt fiber chips are connected to the surface of the continuous basalt fiber through silica sol; the resin comprises the following raw materials: 100 parts of epoxy resin, 1-5 parts of a silane coupling agent, 5-8 parts of an auxiliary agent, 8-10 parts of basalt fiber chippings, 20-30 parts of a curing agent and 30-50 parts of a solvent. According to the invention, the continuous basalt fibers are modified by the basalt chips, and the basalt chips are used as a bridge, so that the interaction between the continuous basalt fibers and a resin matrix is increased, and the bending modulus and bending strength of the insulating core rod are improved.

The invention discloses an anti-ultraviolet fluoride-free black photovoltaic backboard film and a preparation method thereof, the photovoltaic backboard film comprises a black PET inner layer, a black PET supporting layer and a black PET outer layer, and the preparation raw material of the black PET outer layer comprises an hp-TiO2 / PEA-GO composite material. The hp-TiO2 / PEA-GO composite material is added into the uvioresistant fluoride-free black photovoltaic back plate film, so that the uvioresistant fluoride-free black photovoltaic back plate film has a relatively good uvioresistant effect, can absorb most ultraviolet rays and prevent the ultraviolet rays from penetrating through the photovoltaic back plate film, and the hp-TiO2 / PEA-GO composite material keeps stable chemical properties and physical properties under the irradiation of the ultraviolet rays and cannot be decomposed or discolored.

The invention discloses CF120 ultrahigh-strength concrete and a preparation method thereof. The concrete comprises the following raw materials in parts by weight: 500-600 parts of cement; 750 to 860 parts of sand; 1200 to 1350 parts of broken stone; 90 to 100 parts of fly ash; 75 to 83 parts of straw ash; 37 to 50 parts of silica fume; 145 to 160 parts of water; 15 to 20 parts of a water reducing agent; 15 to 20 parts of an exciting agent; 3-5 parts of a defoaming agent; 12-16 parts of a shrinkage reducing agent; 23 to 28 parts of CaCO3 crystal whisker; 20 to 30 parts of polyvinyl formal acetal; 20 to 30 parts of titanium dioxide loaded fiber; the titanium dioxide loaded fibers are prepared by modifying fibers with titanium dioxide; the fibers comprise at least one of steel fibers or polypropylene fibers. The CF120 ultrahigh-strength concrete provided by the invention has relatively high compressive strength and breaking strength, and the situation that the concrete generates cracks is also reduced.

The invention discloses low-shrinkage ultra-high performance concrete and a preparation method thereof, and belongs to the technical field of concrete. The shrinkage ultra-high performance concrete is prepared from the following components in parts by mass: 100 parts of cement, 25 to 100 parts of mineral admixture, 2.1 to 3.5 parts of high-performance water reducing agent, 5 to 10 parts of expanding agent, 0.12 to 0.2 part of thickening time control agent, 2.5 to 4 parts of reinforcing agent, 100 to 160 parts of sand, 1.5 to 3 parts of fiber and 18 to 30 parts of water, the mineral admixture is a product obtained by cofiring the high-aluminum solid waste and CaO at 800-900 DEG C and then carrying out shock cooling treatment. The low-shrinkage ultra-high-performance concrete has excellent compressive strength and tensile property, meanwhile, a large proportion of high-aluminum solid waste replaces part of cement and all silica fume in existing ultra-high-performance concrete, large chemical shrinkage caused by the cement and the silica fume in the hydration reaction process is greatly reduced, and the volume stability of a matrix is improved. A large amount of solid hazardous waste with high aluminum oxide content is used, so that the production and construction cost is reduced, and meanwhile, a method for comprehensively utilizing solid hazardous waste resources is provided.

The invention provides a self-rebounding heat-preservation and heat-insulation protective coating with ultralow thermal conductivity and a protective coating. The self-rebounding heat-preservation and heat-insulation protective coating with ultralow thermal conductivity comprises a coating body and a coating layer, comprising silicon resin emulsion, acrylic resin emulsion, modified polymer expanded microspheres, modified mineral fibers, polyvinyl alcohol toughened and modified hydrophobic silicon dioxide aerogel, a cross-linking agent, a catalyst, a thickening agent, a dispersing agent, a defoaming agent, a coalescing agent, a pH regulator, ethylene glycol and deionized water. The modified polymer expanded microspheres are polymer expanded microspheres subjected to surface modification treatment by a silane coupling agent I, and the modified mineral fibers are mineral fibers subjected to surface modification treatment by a silane coupling agent II. The lowest heat conductivity coefficient of a protective coating obtained by curing the ultralow-heat-conductivity self-rebounding heat preservation and insulation protective coating can reach 0.0180 W / (m.k) at the temperature of 25 DEG C, and the heat insulation temperature difference obtained after irradiation of a non-contact infrared heating lamp at the temperature of 80 DEG C for 15 min and the heat insulation temperature difference obtained after heating of a contact heating platform at the temperature of 80 DEG C for 15 min are larger than 35 DEG C and 40 DEG C respectively.

The invention relates to the field of waterproof coiled materials, and discloses a modified waterproof coiled material based on a waste high polymer material and a preparation method thereof, and the modified waterproof coiled material comprises 40%-50% of waste thermoplastic polyurethane, 25%-30% of waste rubber powder, 15%-20% of asphalt, 5%-7% of nano-silica, 1%-2% of a silane coupling agent, 3%-5% of tackifying resin and 0.5%-1% of an antioxidant. The modified waterproof coiled material is prepared from waste high polymer materials, nano silicon dioxide is modified by a silane coupling agent and then forms chemical bonding or strong physical adsorption with the surface of a base layer, the interface bonding strength is remarkably improved, meanwhile, the tackifying resin is added, the overall viscosity of the coiled material is further enhanced, and the service life of the coiled material is prolonged. The adhesive can be firmly bonded under various base layer conditions, hollowing and falling phenomena are effectively prevented, resource recycling is realized, dependence on increasingly short raw materials such as traditional petroleum asphalt, SBS and APP is reduced, the production cost is reduced, the market competitiveness of the product is improved, the pressure of waste high polymer materials on the environment is relieved, and the adhesive has good application prospects. The sustainable development concept is met.

The invention belongs to the field of functional composite materials, and relates to a flexible stab-resistant material as well as a preparation method and application thereof. The preparation method of the flexible stab-resistant material comprises the following steps: providing a nano aramid aqueous dispersion or aramid slurry, wherein the aramid slurry comprises aramid resin, an amide solvent and a cosolvent; aramid fibers are subjected to surface modification by adopting the nano aramid aqueous dispersion or aramid slurry in a dipping manner to form a functionalized aramid fabric, and the functionalized aramid fabric is compounded with a resin adhesive system comprising benzoxazine resin, epoxy resin and the like to obtain the flexible stab-resistant material. According to the invention, a low-temperature solution polymerization technology is preferably adopted to prepare high-dispersion aramid fiber slurry, and the aramid fiber slurry is directly used for homogenization and intrinsic surface modification of aramid fiber or fabric in a dipping manner, so that the stab-resistant performance of the material is improved. The modified and functionalized aramid fabric and a resin adhesive system with benzoxazine resin as main resin are compounded to obtain the high-performance stab-resistant composite material which is beneficial to application.

The invention relates to the technical field of synthetic fiber paper manufacturing, in particular to meta-aramid paper and a preparation method thereof.The preparation method comprises the steps that para-aramid chopped fibers and potassium hydroxide are added into dimethyl sulfoxide, then water is added, stirring and dispersing are conducted, and nanofiber dispersion liquid is obtained; adding meta-aramid chopped fibers into the nanofiber dispersion liquid for defibering, and uniformly mixing to obtain a meta-aramid chopped fiber dispersion liquid; the preparation method comprises the following steps: continuously and stably adding a meta-aramid polymer liquid, a nanofiber dispersion liquid and a precipitation agent into precipitation equipment, carrying out high-speed shearing to obtain a fibrid, carrying out cooling molding in a water washing pool, and carrying out multi-stage water washing to obtain the meta-aramid fibrid, the meta-aramid chopped fiber dispersion liquid and the meta-aramid fibrid are subjected to defibering and stirring and then subjected to wet forming, squeezing, drying and hot pressing, and the meta-aramid paper is obtained. The meta-aramid paper has higher tensile strength, uniformity, tightness and insulating property, and better internal binding force and surface strength.

The invention provides a silicon carbide seed crystal bonding method, a silicon carbide single crystal and a preparation method and application of the silicon carbide single crystal, and the bonding method comprises the following steps: firstly, providing a glue solution containing a binder, a silane coupling agent and a solvent, then coating the glue solution on the bonding surface of graphite paper and the silicon carbide seed crystal, and then concentrically pressing and bonding the graphite paper and the silicon carbide seed crystal at one time, carrying out primary hot pressing by adopting the silicon carbide crystal ingot as a pressing block, and carrying out secondary hot pressing by adopting the pressing block according to the sequence of the pressing block, the silicon carbide seed crystal, the graphite paper and the graphite support from top to bottom after the primary hot pressing is finished, so as to finish the bonding of the silicon carbide seed crystal; according to the bonding method, a glue solution containing a silane coupling agent is selected and matched with a silicon carbide crystal ingot to serve as a pressing block for primary hot pressing, so that the problem of poor distribution of a glue layer on a bonding surface of graphite paper and silicon carbide seed crystals is effectively solved, the interface bonding strength of the graphite paper and the silicon carbide seed crystals is also effectively improved, and the preparation requirement of the silicon carbide single crystal is met.

The utility model provides a tray foot with a protection structure and a tray, the tray foot with the protection structure is suitable for being arranged at the corner of a bearing plate of the tray to support the bearing plate, and the tray foot comprises a first surface suitable for being in contact with the lower surface of the bearing plate to support the bearing plate, and a second surface suitable for being in contact with the lower surface of the bearing plate; the second surface is opposite to the first surface and is suitable for being in contact with the ground or a bottom plate; the side surface is arranged between the first surface and the second surface; the first protection edge structure is arranged on a part of the edge of the first face, protrudes out of the first face and is suitable for being located on the outer side of the corner of the bearing plate when the first face makes contact with the lower surface of the bearing plate so as to protect the corner of the bearing plate, and therefore damage to the corner of the bearing plate due to collision or impact and the like is prevented. And the attractive appearance and the service life of the bearing plate are prevented from being influenced by damage.

The invention relates to the technical field of synthetic fiber paper manufacturing, in particular to aramid-based heating paper and a preparation method thereof.The preparation method comprises the steps that para-aramid chopped fibers and potassium hydroxide are added into dimethyl sulfoxide, then water is added, stirring and dispersing are conducted, and nanofiber dispersion liquid is obtained; adding carbon fibers and aramid chopped fibers into the nanofiber dispersion liquid for defibering, and uniformly mixing to obtain chopped fiber dispersion liquid; the preparation method comprises the following steps: adding a meta-aramid polymer liquid, a nanofiber dispersion liquid and a precipitation agent into precipitation equipment, carrying out high-speed shearing to obtain a fibrid, carrying out cooling molding in a water washing pool, and carrying out multi-stage water washing to obtain a meta-aramid fibrid; and uniformly mixing the chopped fiber dispersion liquid and meta-aramid fibrid, and then carrying out wet-process papermaking, squeezing drying and hot-pressing treatment to obtain the aramid-based heating paper. According to the preparation method, the carbon fibers and the aramid chopped fibers can be well dispersed, and the prepared aramid-based heating paper has higher uniformity and better mechanical properties and heating performance.

The invention provides an epoxy modified cement-based material, the epoxy modified cement-based material comprises an organic phase structure and inorganic crystals, and the inorganic crystals are radially distributed on the surface of the organic phase structure; the organic phase structure is a spherical or sphere-like structure with the diameter of 3-15 microns; the inorganic crystal is of a needle-shaped, rod-shaped or sheet-shaped structure with the length being 0.3-3 microns and the diameter being 0.05-0.5 microns. The epoxy modified cement-based material disclosed by the invention shows good adhesion and dispersion resistance under water or in a humid environment, can realize rapid underwater construction, and keeps stable performance for a long time under harsh conditions such as a marine environment and a humid environment; the engineering requirements of multiple fields such as building structure repairing, underwater repairing, rapid first-aid repair, ocean protection and road and bridge engineering are met, and the integration of high strength, high toughness, strong interface bonding and long-acting durability is realized.

The application discloses high-strength composite cement blanket and belongs to the technical field of civil engineering composite materials. The application improves the three-dimensional fabric structure: a three-dimensional weaving is adopted to form a top layer, a middle layer and a bottom layer, wherein the middle layer is formed by a honeycomb three-dimensional structure formed by interweaving vertical fiber filaments and horizontal oblique fiber filaments which are arranged obliquely relative to the vertical fiber filaments; the vertical fiber filaments connect the top layer and the bottom layer; and the horizontal oblique fiber filaments pass through the vertical fiber filaments in an S-shaped wiring mode multiple times to form limiting knots which are distributed in the top layer, the middle layer and the bottom layer to form an overall tensile strength reinforcing structure. The three-dimensional fabric can be combined with a "two cloth and one film" protective layer and a solidifiable composite material containing gold steel sand. The application realizes isotropic reinforcement through the honeycomb structure and builds a mechanical occlusal interface through the S-shaped limiting structure, thereby significantly improving the bending strength, interface adhesion and waterproof durability of the cement blanket, and the application is suitable for slope protection, trench lining and temporary road paving engineering and the like.

The invention discloses a polypropylene film suitable for a film lamination method and a preparation method of the polypropylene film. The polypropylene film comprises the following components in parts by weight: 85.6-91.85 parts of polypropylene; 4-7 parts of long-chain branched polypropylene; 4-7 parts of a compatibilizer; 0.05 to 0.1 part of a nucleating agent; and 0.1 to 0.3 part of an antioxidant. Firstly, polypropylene is selected, so that the wettability of a melt to carbon fibers is effectively improved, and the filling defect caused by high viscosity of a traditional material is overcome; and secondly, the compatibilizer is introduced to form firm chemical bonding with the fiber surface, so that the interface bonding strength is greatly enhanced. And finally, by combining a precise extrusion and casting process, the prepared polypropylene film is uniform in thickness, excellent in interface performance and suitable for a film lamination method.

The application discloses a kind of optical cable surface modification method, modified optical cable and concrete monitoring system.The optical cable surface modification method includes the following steps: surface roughening treatment is carried out to the coating layer of optical cable, and surface roughened optical cable is obtained;Nanometer material dispersion liquid is coated to the surface of surface roughened optical cable, and modified optical cable is obtained after solidification treatment.The application constructs micro-nano rough structure on the surface of optical cable coating layer by the synergistic modification strategy of "surface roughening+nanometer material loading", and loads active nanometer material, so that modified optical cable can induce hydration product to be generated densely at interface after being buried in concrete, significantly improve interface bonding strength, reduce interface porosity and thermal resistance, so that high-precision sensing and long-term monitoring stability of stress, strain and temperature are realized.

The present application relates to the technical field of ceramic coating, especially to a micro-nano structure ceramic coating and its application on the reaction furnace of zircon sand boiling chlorination method, aiming at solving the problems of weak bonding force between the existing protective coating and the substrate, poor thermal shock resistance and easy failure in long-term high-temperature chlorine environment; the present application constructs a nano-wire reinforced micro-nano structure transition layer on the surface of porous corundum brick substrate in situ, and sequentially constructs a lanthanum phosphate bonding layer and a yttrium stabilized zirconium oxide barrier layer on the transition layer; the design utilizes the mechanical anchoring effect of micro-nano structure and the strong chemical bonding ability of lanthanum phosphate to realize the firm combination of the coating and the substrate; the dense characteristics of the zirconium oxide layer provide ultimate protection; the method significantly improves the overall anti-peeling ability and long-term corrosion resistance of the coating system.

The invention provides an efficient heat dissipation type quick charging pile cable, and relates to the technical field of cable production, the efficient heat dissipation type quick charging pile cable comprises an MXene / Wacker SilGel 612 aluminum alloy strip, a preparation method comprises the steps that Wacker SilGel 612 and MXene are added into deionized water, ultrasonic treatment is conducted, then stirring is conducted, a mixture is obtained, then aluminum alloy is immersed into the mixture, the mixture is transferred into a freezing shaking table, and oscillation is conducted; the invention also relates to the preparation steps of the efficient heat dissipation type quick charging pile cable and the calculation of the overlapping rate of the semi-conductive nylon tape wrapped outside the conductor.

The present application relates to the technical field of resin, in particular to a conductive polypropylene composite material and a preparation method thereof.In view of the problems of poor processing fluidity, easy shear damage of conductive network and deterioration of mechanical properties caused by high filling of conductive filler in the prior art, the present application realizes the low volume resistivity, high melt flow rate and excellent mechanical toughness by the solid phase pre-coating technology, and effectively balances the conductivity, processability and strength.

The invention relates to the technical field of preparation of concrete, in particular to LC3-basalt fiber regenerated block concrete and a preparation method thereof.The preparation method comprises the following preparation steps that S1, LC3 cement, regenerated blocks, natural sand and gravel are poured into a stirrer to be subjected to uniform dry mixing, and a dry mixture is obtained; s2, adding water, a modified water reducer and a performance modifier into the dry mixture, performing wet mixing, uniformly scattering modified basalt fibers during wet mixing, and performing uniform stirring to obtain a wet mixture; and S3, pouring the wet mixture into a test mold, standing at room temperature, demolding, and curing for 26-28 days to obtain the LC3-basalt fiber regenerated block concrete. Through the synergistic effect of the modified basalt fiber, the modified water reducer and the performance modifier, the compressive strength, the strength retention rate after high temperature and the tensile strength of the concrete are remarkably improved, and chemical activation and densification after the regenerated block is added are achieved.

The invention discloses a process for cold spraying of a high-thermal-conductivity coating and application of the cold spraying of the high-thermal-conductivity coating to an LED vehicle lamp, and belongs to the technical field of coatings. According to the method, firstly, the gas atomization copper powder is subjected to cold spraying to form the heat conduction coating 1 which is high in bonding strength with the base material and good in heat conduction effect, and then the electrolytic copper powder and the superfine alloy powder serve as raw materials to be subjected to cold spraying to form the heat conduction coating 2 which is good in heat conduction effect and high in deposition efficiency; by adding the superfine alloy powder, the porosity of the coating is remarkably reduced, and the bonding strength of the heat-conducting coating 1 and the heat-conducting coating 2 is improved. Meanwhile, the heat conduction coefficient of the heat conduction coating 1 is higher than that of the heat conduction coating 2, heat generated by the LED light source can be rapidly conducted to the heat conduction coating 1 from the heat conduction coating 2 by means of gradient distribution of the heat conduction performance, then the heat is transferred to a radiator, namely the aluminum alloy die casting, and the heat dissipation effect is remarkably improved.

This invention discloses a self-healing, anti-corrosion, and cooling coating and its preparation method. The preparation method includes: TiO2 surface activation treatment; in-situ construction of a mesoporous silica shell and loading of a corrosion inhibitor; surface silane modification; and coating and curing after blending the obtained filler with resin and curing agent. The coating consists of a polymer resin matrix and a multifunctional core-shell nanocomposite material uniformly dispersed therein; the composite material has a three-level structure of core-shell-interface layer: titanium dioxide as the core, mesoporous silica loaded with corrosion inhibitor as the functional shell, and a silane coupling agent as the interfacial compatibility layer. Through multi-level structural design, this invention enables a single filler to simultaneously achieve high solar reflectance, high infrared emission, and intelligent release of corrosion inhibitors. The coating combines a physical barrier, active corrosion prevention, and radiation cooling triple protection mechanism, and can be widely used for long-term protection of outdoor metal or non-metal substrates.

The invention relates to the technical field of synthetic fiber paper manufacturing, in particular to para-aramid paper and a preparation method thereof, and belongs to the technical field of synthetic fiber paper manufacturing. The preparation method comprises the following steps: adding para-aramid chopped fibers and potassium hydroxide into dimethyl sulfoxide, then adding water, and stirring and dispersing to obtain nanofiber dispersion liquid; adding para-aramid chopped fibers into the nanofiber dispersion liquid for defibering, and uniformly mixing to obtain para-aramid chopped fiber dispersion liquid; the preparation method comprises the following steps: continuously and stably adding a meta-aramid polymer liquid, a nanofiber dispersion liquid and a precipitation agent into precipitation equipment, carrying out high-speed shearing to obtain a fibrid, then carrying out cooling molding in a water washing pool, and carrying out multi-stage water washing to obtain the meta-aramid fibrid, and carrying out wet papermaking on the para-aramid chopped fiber dispersion liquid and meta-aramid fibrid to obtain the para-aramid paper. The para-aramid paper is higher in mechanical property, good in uniformity and high in density, and the glue penetration risk in the process of preparing honeycombs from the para-aramid paper is reduced.

The invention relates to the technical field of composite electroplating, in particular to an electroplating method for preparing a high-wear-resistance self-lubricating plating layer, which comprises the following steps: firstly, carrying out pretreatment of oil removal and acid pickling activation on a metal workpiece; then preparing a nano composite nickel plating solution in which a nickel plating basic solution contains a nano particle composite phase subjected to pre-dispersion treatment, and the total concentration of composite particles is 10-60g / L; then the dispersion stability of the nano-composite nickel plating solution is maintained in a circulating filtration and mechanical stirring combined mode, and the pretreated workpiece is electroplated; and finally, after electroplating is completed, the workpiece is cleaned and dried. According to the electroplating process for preparing the nickel-based composite coating with high wear resistance and low friction coefficient, the pulse current is adopted, and the high instantaneous current density and turn-off time of the pulse current are utilized, so that desorption and rearrangement of adsorbed particles are facilitated, uniform embedding of the particles is promoted, nickel matrix crystal grains are refined, and the compactness and comprehensive mechanical properties of the coating are further optimized.

This invention relates to the field of brass material technology, specifically a high-strength, high-toughness brass material and its preparation method. A porous oxide film is pre-formed on the brass surface through plasma electrolytic oxidation. A double-bonded silver-loaded graphene oxide-doped oxide film is then constructed on the brass surface. A photocurable sealing coating is then prepared for sealing. In the photocurable sealing coating, double-bonded silver-loaded graphene oxide and modified MXene are introduced as fillers. MXene is first thiolated with 3-mercaptopropyltriethoxysilane, and then grafted with a double-bonded dibenzimidazole ring derivative via photo-clicking to obtain modified MXene. A vinyl-terminated polyurethane is used as a crosslinking agent, and a complex crosslinking network is constructed using a blend of o-phenylphenoxyethyl acrylate, butyl acrylate, glycidyl methacrylate, and octadecyl acrylate as acrylic monomers. A diluent and solvent are introduced to extend the service life of the brass material.