646 results about "Barium sulfate" patented technology

The invention relates to the technical field of friction materials, and particularly discloses an electromagnetic brake friction material prepared from granules and a preparation process of the electromagnetic brake friction material in order to solve the problem that an existing electromagnetic brake friction plate is difficult to prepare or insufficient in performance. The reinforcing material comprises plasma modified aramid pulp, coupling modified composite mineral fibers, SiO2 coated tetrapod-like zinc oxide whiskers and carbon fiber-aluminum silicon whiskers; the filler comprises modified needle-like wollastonite and organic modified precipitated barium sulfate; the adhesive comprises boron-silicon synergistic modified phenolic resin and modified carboxy nitrile rubber. The raw materials are improved, and granules are prepared by adopting a mixing and crushing process, so that the content of an adhesive can be greatly reduced, meanwhile, the die filling efficiency can be improved, the die thickness and the high-temperature heat fading of the friction material can be reduced, a cold press molding process can be omitted, and the qualification rate of finished friction materials can be improved.

The invention discloses phenolic epoxy anticorrosive paint as well as a preparation method and application thereof, and belongs to the technical field of anticorrosive paint. The anticorrosive paint comprises a component A and a component B, the component A comprises novolac epoxy resin, a wetting dispersant, an adhesion promoter, a thixotropic agent, a pigment, a filler and a solvent A, and the component B comprises a Mannich base curing agent and a solvent B; wherein the novolac epoxy resin is composed of phenol type novolac epoxy resin and bisphenol A type novolac epoxy resin, the wetting dispersant is composed of copolymer containing acidic groups and modified polyurethane, the adhesion promoter is composed of titanate and aromatic polyether polyol, and the thixotropic agent is composed of organic bentonite and polyamide wax slurry. The pigment is composed of a color developing pigment and a zinc phosphate anti-rust pigment, and the filler is composed of a hydrophobic filler and precipitated barium sulfate. The anticorrosive paint disclosed by the invention has excellent heat and humidity resistance, corrosion resistance, temperature change cycle resistance, flexibility and adhesive force, and can perform long-acting protection on a metal base material under a thermal insulation layer.

The invention discloses a high-temperature-resistant metal surface coating and a preparation method thereof, and the high-temperature-resistant metal surface coating comprises the following components in parts by weight: 40-60 parts of ceramic silicon resin, 20-30 parts of polyether sulfone modified organic fluorine resin, 8-10 parts of water-based polyimide resin, 10-15 parts of zinc chrome, 4-6 parts of boron nitride, 3-5 parts of a modified phenolic aldehyde amine curing agent, 8-15 parts of barium sulfate and 8-10 parts of short carbon fiber. The invention relates to the technical field of preparation of metal surface coatings. The metal surface coating is prepared from the following components in parts by weight: 5-8 parts of hollow glass beads, 2-4 parts of a silane coupling agent, 1-3 parts of an organic silicon defoaming agent, 8-12 parts of a dispersing agent, 1-2 parts of a thickening agent and 6-9 parts of a composite coating anti-aging agent. According to the high-temperature-resistant metal surface coating and the preparation method thereof, the ceramic silicon resin, the polyethersulfone modified organic fluororesin and the water-based polyimide resin are adopted as main resin components, a stable structure can be formed at high temperature, and the high-temperature-resistant metal surface coating can bear higher temperature.

The invention discloses an anti-corrosion thermal insulation material, a preparation method and application thereof. The coating comprises the following components in parts by weight: 0.1-4 parts of graphene, 5-15 parts of composite microspheres, 10-30 parts of barium sulfate, 10-30 parts of film-forming resin, 18-45 parts of pigments and fillers, 1-8 parts of auxiliaries and 20-50 parts of deionized water. The anti-corrosion and heat-insulating material combines the advantages of graphene, composite microspheres and barium sulfate, and has excellent anti-corrosion performance and heat-insulating performance; the graphene and the composite microspheres can effectively reflect and block heat transfer, so that the temperature of the surface of the coating is reduced; due to the addition of barium sulfate, the stability and mechanical property of the coating are improved, and meanwhile, the corrosion resistance of the coating is enhanced; the preparation process is simple, low in cost and easy for industrial production; and the surface treating agent is suitable for various metal and non-metal surfaces, such as plates, industrial equipment, storage tanks, pipelines and buildings, and has a wide application prospect.

The invention relates to the technical field of cables, and provides a flexible corrosion-resistant robot cable, which sequentially comprises a cable core, a shielding layer, an inner sheath layer and an outer sheath layer from inside to outside, and is characterized in that the cable core sequentially comprises a conductor and an insulating layer from inside to outside; the outer sheath layer comprises the following raw material components in parts by weight: 60-70 parts of high-density polyethylene, 15-25 parts of an ethylene-tetrafluoroethylene copolymer, 0.5-1.5 parts of an antioxidant, 1-3 parts of a plasticizer, 8-12 parts of a flame retardant, 10-20 parts of polyethylene glycol diacrylate composite barium sulfate and 1-2 parts of a lubricant; the polyethylene glycol diacrylate composite barium sulfate is prepared from the following raw materials: polyethylene glycol diacrylate, barium chloride and sodium sulfate. According to the technical scheme, the problem of poor corrosion resistance of the robot cable in the prior art is solved.

The invention discloses a waterborne epoxy coating for heavy corrosion prevention and a preparation method of the waterborne epoxy coating, and relates to the technical field of coatings. The waterborne epoxy resin, the waterborne epoxy curing agent, the titanium dioxide, the barium sulfate, the superfine talcum powder, the mica powder, the zinc phosphate, the aluminum tripolyphosphate, the superfine mica iron oxide, the glass flakes and the like are used as raw materials for preparing the epoxy coating. Meanwhile, the sheet structures of the superfine mica iron oxide and the glass flakes prolong the time for water and a corrosive medium to reach the surface of the base material, and sufficient dissociation time is given to phosphate. The anticorrosive paint disclosed by the invention has good flexibility and corrosion resistance.

The invention discloses a wear-resistant non-woven fabric and a preparation method thereof, and relates to the technical field of non-woven fabrics, the non-woven fabric is prepared from the following components by weight: 40-70 parts of low density polyethylene, 30-45 parts of polypropylene, 10-25 parts of modified bamboo fiber, 10-16 parts of barium sulfate, 6-9 parts of an antioxidant, 3-7 parts of a plasticizer, and 1-4 parts of a binder; through a bamboo fiber modification technology, the comprehensive mechanical property of the material is improved, the service life of the material is prolonged, the comfort and environment-friendly characteristics are also considered, and the prepared non-woven fabric has a lasting and stable antibacterial function while maintaining excellent wear resistance.

The invention discloses a two-component photoinduced energy storage diffuse reflection nano coating as well as a preparation method and application thereof, and belongs to the technical field of building materials. Comprising prime paint and surface paint, the prime paint comprises 45-55 parts of paint emulsion, 30-40 parts of titanium dioxide, 5-10 parts of precipitated barium sulphate powder, 5-10 parts of pearl powder, fumed silica, an anti-settling agent, a light stabilizer, a dispersing agent and a coalescing agent; the surface layer coating is prepared from 55 to 65 parts of coating emulsion, 20 to 30 parts of alkaline earth aluminate, 10 to 15 parts of hollow glass beads, 5 to 10 parts of pearl powder, an anti-settling agent, a light stabilizer, a dispersing agent and a coalescing agent; the coating emulsion comprises acrylic resin and epoxy acrylate; the coating disclosed by the invention has excellent photoinduced energy storage performance and a good diffuse reflection effect, and can meet illumination requirements in environments such as underground parking lots, underground commercial plazas, traffic tunnels, civil air defense projects or military underground facilities.

The invention discloses a water-based single-component super-amphiphobic refrigeration coating, a coating and a preparation method of the coating, and relates to the technical field of coatings. 20-35 parts of a second filler; 5-10 parts of a third filler; 20-35 parts of a film-forming substance, 1-9 parts of an auxiliary agent and 3-50 parts of water; the first filler comprises fluorine-containing silane modified fumed silica; the second filler comprises at least one of long-chain silane modified precipitated barium sulfate, long-chain silane modified calcium carbonate and long-chain silane modified hollow glass beads; the third filler comprises an infrared emission filler treated by an organic silicon modifier. By modifying the filler, the purposes of stable dispersion and functional synergy of low-surface-energy substances and high-proportion inorganic nano filler in a water-based system are achieved.

The invention belongs to the technical field of brake pad materials, and aims to solve the problems that the friction coefficient of an existing organic-based brake pad is unstable, so that brake failure is likely to occur, the driving safety is affected, the operation cost is increased due to frequent replacement of the brake pad, and normal operation of rail transit is affected. Therefore, the invention provides the organic track brake pad material with the high friction coefficient and the preparation method thereof. The material comprises 20-30% of thermosetting phenolic resin, 8-15% of bismaleimide resin, 8-12% of polyimide resin, 6-10% of high-strength carbon fiber, 6-10% of aramid fiber, 4-8% of basalt fiber, 3-6% of graphite, 2-5% of molybdenum disulfide, 3-6% of copper fiber, 2-5% of silicon carbide particles, 3-6% of barium sulfate, 2-4% of aluminum oxide, 2-4% of talcum powder, 2.5-5% of a curing agent and 1.5-3.5% of other auxiliaries. The friction performance of the organic track brake pad material is improved under the condition that other performance of the organic track brake pad material is not reduced, the defect of the friction performance of an existing brake pad material is effectively overcome, and reliable guarantee is provided for high-performance safe operation of track traffic.

The invention relates to a photovoltaic heat dissipation enhanced radiation refrigeration cement-based composite material as well as a preparation method and application thereof. The composite material comprises white Portland cement, radiation refrigeration particles and water, the radiation refrigeration particles comprise alpha aluminum oxide and barium sulfate, the mass fraction of the radiation refrigeration particles relative to the total solid content in the composite material is 30%-60%, and the mass ratio of the alpha aluminum oxide to the barium sulfate is 1: 1-2: 1; the average particle size of the radiation refrigeration particles is 0.3-10 [mu] m; the mass fraction of the white Portland cement relative to the total solid content in the composite material is 40-70%. Compared with the prior art, the reflectivity and emissivity of the material are improved, efficient photovoltaic thermal management is achieved, meanwhile, the material has the advantages of being low in cost, simple in process, high in stability and the like, development of the building photovoltaic integrated technology is expected to be promoted, and the energy utilization efficiency is improved.

The invention belongs to the field of light low-carbon concrete, and discloses hydraulic low-carbon concrete containing barium sulfate barite as well as a preparation method and application of the hydraulic low-carbon concrete. The concrete is prepared from 42.5-grade Portland cement, barium sulfate barite powder, modified polypropylene fiber, industrial waste residue lightweight aggregate, boron carbide powder, nano silicon dioxide, a polycarboxylate superplasticizer, a composite exciting agent and water according to specific parts by weight. Wherein the barium sulfate barite powder is subjected to graded proportioning and calcination activation, the modified polypropylene fiber is treated by plasma and a silane coupling agent, the industrial waste residue lightweight aggregate is formed by compounding fly ash ceramsite and steel slag microbeads, and the composite exciting agent is composed of specific components. The concrete is high in compressive strength, low in dry density, excellent in neutron shielding and gamma ray attenuation performance and low in chloride ion diffusion coefficient. The preparation method comprises the steps of premixing modification, gradient stirring, vibration compaction and steam curing. The concrete is suitable for construction of a nuclear reactor containment, a radioactive waste repository and a nuclear medicine protection wall.

The invention provides a preparation method of a super-amphiphobic high-reflection coating, and relates to the technical field of self-cleaning materials. A one-step method is adopted, and the core is to prepare functional super-amphiphobic particles with micro-nano structures. A micro-nano composite structure is constructed by a method of regrowing silicon dioxide on the surfaces of micron-scale barium sulfate, titanium dioxide or calcium carbonate particles, and then surface modification is performed to prepare the super-amphiphobic particles. And mixing the prepared particles with a water-based emulsion, alcohol-soluble or ester-soluble resin, a coalescing agent, a defoaming agent, a wetting leveling agent and an adhesive according to a certain ratio to prepare the coating. And finally, a coating with high reflectivity and super-amphiphobic performance is formed on the surface of the substrate, so that the contact angle of water drops and oil drops on the surface of the material is greater than 150 degrees.

To provide a water-based flexographic ink excellent in drying property, leveling property and transfer property.SOLUTION: There is provided a water-based flexographic ink comprising an acrylic resin emulsion, barium sulfate, and a styrene-maleic acid resin. The water-based flexographic ink according to claim 1, wherein the barium sulfate has an average particle size of 0.1 to 2 μm. The water-based flexographic ink according to claim 1 or 2, wherein the barium sulphate has an oil absorption of 10 to 100 ml / 100 g. The water-based flexographic ink according to claim 1 or 2, further comprising a color pigment.SELECTED DRAWING: None

The invention discloses a method for determining the content of lithium sulfide based on a gravimetric method, and belongs to the field of battery material detection. The invention discloses a method for determining the content of lithium sulfide based on a gravimetric method. The method comprises the following steps: A, oxidizing lithium sulfide into lithium sulfate at high temperature; b, converting lithium sulfate into barium sulfate precipitate; c, burning the precipitate at high temperature and keeping the weight constant; and D, calculating the content of lithium sulfide according to barium sulfate. According to the method, the content of lithium sulfide is measured through a gravimetric method, the problem that the content of lithium sulfide cannot be accurately measured in the industry is solved, and the method is easy to operate, high in accuracy, good in precision and safer.

The invention relates to the technical field of epoxy resin coatings, and discloses a primer-topcoat solvent-free oil-resistant static-conductive phenolic epoxy coating which is composed of a component A and a component B, wherein the component A is prepared from the following raw materials in parts by weight: 25 to 35 parts of solvent-free liquid novolac epoxy resin, 5 to 10 parts of low-viscosity solvent-free flexible epoxy resin, 3 to 8 parts of epoxy active diluent, 5 to 10 parts of needle-like nano titanium dioxide, 5 to 10 parts of precipitated barium sulfate, 30 to 40 parts of mica powder, 0.1 to 1 part of structured acrylic copolymer dispersing agent, 1 to 1.5 parts of organic silicon defoaming agent and 0.1 to 1 part of polyamide wax powder; 0.1 to 1 part of a modified organic silicon leveling agent and 0.1 to 1 part of a siloxane coupling agent; and the component B is prepared from the following raw materials in parts by weight: 95 to 100 parts of modified alicyclic amine and 1 to 5 parts of 2, 4, 6-tri (dimethylaminomethyl) phenol.

The invention discloses a novel automobile back view mirror flexible printed circuit board prepared based on weldable silver paste, and belongs to the technical field of electronic materials and devices, conductor patterns in the flexible printed circuit board comprise a main circuit pattern and an auxiliary function structure formed by weldable low-temperature curing silver paste; the curing temperature of the weldable low-temperature silver paste is 125-135 DEG C, and the weldable low-temperature silver paste comprises conductive filler, a polymer resin system, a high-boiling-point ester solvent, a curing agent, a silane coupling agent, a polyamide wax thixotropic agent, a polysiloxane defoaming agent, modified carbon nanotubes, modified aluminum oxide powder, modified barium sulfate and a low-stress modifier. The polymer resin system comprises novolac epoxy resin, biphenyl epoxy resin and a polyacrylate-CTBN copolymer; through the synergistic effect of all the components and an innovative process, comprehensive improvement of mechanical reliability, environmental durability, conductive stability and power load capacity is achieved, and the strict requirement for high reliability of the automobile rearview mirror in an extreme environment is perfectly met.

The invention relates to the technical field of water-based anticorrosive primer coating, in particular to water-based anticorrosive primer and a preparation method thereof. The water-based anticorrosive primer is prepared from the following preparation raw materials in parts by mass: 45 to 50 parts of water-based epoxy resin emulsion, 15 to 18 parts of curing agent, 0.2 to 0.5 part of wetting agent, 8 to 12 parts of surface calcium ionization modified anti-rust pigment, 1.2 to 1.5 parts of anti-settling agent, 0.4 to 0.6 part of defoaming agent, 20 to 22 parts of superfine precipitated barium sulfate, 0.3 to 0.5 part of coupling agent and 8 to 10 parts of deionized water. The water-based anti-corrosion primer has remarkable advantages in the aspects of anti-corrosion performance, adhesive force, stability, drying speed and the like, can be effectively applied to anti-corrosion coating of metal substrates, and provides a product solution with excellent performance for the coating industry.

The invention relates to the technical field of radiation refrigeration coatings, and discloses a daytime radiation refrigeration coating and a preparation method thereof.The daytime radiation refrigeration coating is attached to the surface of a base material and comprises an interface thermal buffer layer, a directional scattering reflection layer and an infrared selective emission layer from inside to outside; the interface thermal buffer layer comprises zinc oxide arrays grown on the surface of the base material in situ through a hydrothermal reaction, and graphene oxide distributed among the zinc oxide arrays; the directional scattering reflection layer comprises barium sulfate particles and titanium dioxide particles; the infrared selective emission layer comprises a core-shell structure formed by coating silicon dioxide with titanium dioxide, and polydimethylsiloxane; the base material is an aluminum plate, a stainless steel plate or glass. By constructing the interface thermal buffer layer containing the zinc oxide array and the graphene oxide, heat conduction and interface thermal stress between the scattering layer and the infrared selective emission layer are effectively relieved, and the thermal stability and long-term refrigeration performance of the coating are improved.

The invention belongs to the technical field of high polymer materials, and particularly relates to a polyolefin composite material as well as a preparation method and application thereof. The polyolefin composite material is prepared from the following raw materials: polyethylene, a polyolefin toughening agent, a compound flame retardant and a filler, the melt index of the polyethylene at 190 DEG C / 2.16 kg is greater than or equal to 18 g / 10 min, and the bending modulus is less than or equal to 160 MPa; the polyolefin toughening agent is selected from at least one of an ethylene-propylene copolymer, an ethylene-butylene copolymer and an ethylene-vinyl acetate copolymer, and the melt index at 230 DEG C / 2.16 kg is greater than or equal to 9 g / 10 min; the compound flame retardant comprises tetrabromobisphenol S bis (2, 3-dibromopropyl) ether, antimony trioxide and hydroquinone bis (diphenyl phosphate), and the filler is at least one of talcum powder, barium sulfate and wollastonite. Through specific types of polyethylene, the polyolefin flexibilizer, the compound flame retardant and the filler, excellent flame retardance and toughness can be obtained.

The invention relates to the technical field of organic high-molecular compound synthesis, in particular to a modified ABS material diffusion plate and a preparation method thereof.The preparation method comprises the steps that dried ABS resin and acrylonitrile-butadiene-styrene copolymer are mixed to prepare a modified ABS base material; mixing organic silicon microspheres and nano barium sulfate to obtain a modified light diffusion agent; judging that the modified light diffusant is unqualified by comparing the refractive index absolute difference between the modified light diffusant and the modified ABS base material, and performing modification compensation; a titanate coupling agent is determined to be adopted for modification according to the content of inorganic particles of the modified light diffusion agent; mixing the modified light diffusant with an antioxidant system, an ultraviolet protective agent and a processing aid to obtain a functional additive; and mixing with a modified ABS (Acrylonitrile Butadiene Styrene) base material, and extruding by using a twin-screw extruder to Through multi-parameter feedback and accurate compensation control, the problems that the compatibility of the modified light diffusion agent and the base material is poor and the stability of the machining process is insufficient are effectively solved.

The invention discloses a preparation method of a mute tube core layer and a mute tube. The preparation method comprises the following steps: step 01, adding 15-55 parts by weight of polypropylene resin, 0.5-10 parts by weight of a coupling agent, 0.5-5 parts by weight of a lubricant, 0.05-1 part by weight of an antioxidant and 0.1-3 parts by weight of other additives into a twin-screw extruder from a main feeding port of the twin-screw extruder, and melting and mixing to form an intermediate melt; 02, 45-85 parts by weight of barium sulfate is added into a double-screw extruder through at least two side feeding ports of the double-screw extruder, the barium sulfate and the intermediate melt are subjected to melt blending, and a blended melt is formed; and step 03, extruding the blended melt by a twin-screw extruder, and sequentially passing through a melt pump and a pipeline core mold to form the pipe core of the mute pipe. According to the preparation method, the filling proportion of barium sulfate is increased to 70% or above, the material density is larger than 2.4 g / cm < 3 >, and the noise test of a drainage pipe system of the mute pipe prepared through the preparation method is smaller than 20 dB.

The invention discloses a radiation-resistant and electromagnetic-shielding resin-based composite sheet as well as a preparation method and application thereof. The invention belongs to the technical field of resin-based composite materials. The invention aims to solve the technical problems of poor radiation resistance and electromagnetic shielding capability of a polyether-ether-ketone resin matrix. The method comprises the following steps: firstly, carrying out surface modification on glass fibers by utilizing a mixed acid solution and a silane coupling agent; then, Fe3O4 is uniformly loaded on the surface of the glass fiber through electrophoretic deposition; uniformly mixing the polyether-ether-ketone powder, the superfine barium sulfate and the auxiliary filler to prepare raw material slurry; and finally, preparing a prepreg by using a slurry method, and performing hot press molding to prepare the composite sheet with the multi-layer structure. Compared with PEEK pure resin, the electromagnetic shielding performance and the gamma-ray irradiation resistance of the composite sheet are obviously improved. The application of the PEEK material in stealth technologies such as nuclear power aircraft carriers, nuclear power submarines, nuclear power station units and unmanned aerial vehicles is realized.

The invention discloses a high-reflectivity nano-composite ink formula and a gradient curing preparation method thereof, and belongs to the technical field of reflective ink. According to the formula, the high-reflectivity nano-composite ink comprises 28-45 parts of matrix resin, 15-30 parts of a nano-composite reflective material, 4-8 parts of a photoinitiator, 1-5 parts of a dispersing agent, 0.5-3 parts of an antioxidant, 0.5-1 part of a flatting agent and 35-50 parts of a solvent, wherein the matrix resin is fluorosilicone modified acrylic resin, and the nano-composite reflective material is gadolinium lanthanum and magnesium fluoride compounded core-shell barium sulfate. In order to solve the problem that the reflectivity of a traditional reflective ink product in a short-wave illumination application scene is greatly reduced, the matrix resin and the reflective material are improved and optimized, the nano-composite ink with high reflectivity in visible light and ultraviolet light wavebands is prepared, and the nano-composite ink is good in stability and can meet the use requirements of more scenes.

The invention belongs to the technical field of modified plastics, and particularly relates to a high-reflection low-transmittance polypropylene composite material as well as a preparation method and application thereof. The invention provides a novel polypropylene composite material formula, which comprises homo-polypropylene, precipitated barium sulphate, hollow glass beads, maleic anhydride grafted polypropylene and a hyperbranched polymer dispersant, through selection and synergistic effect of the specific components, the reflectivity of the obtained polypropylene composite material is significantly improved, the light transmittance is greatly reduced, and the polypropylene composite material has a good application prospect. Good mechanical properties and high-whiteness surface appearance are kept, and the high-whiteness optical fiber can be widely applied to the field of various optical products.

The invention discloses a radiation refrigeration coating and a preparation method thereof. The radiation refrigeration coating comprises the following raw materials in parts by weight: 18-21 parts of epoxy resin, 8-9 parts of a reactive diluent, 22-23 parts of an anhydride curing agent, 25-30 parts of hollow silicon dioxide microspheres, 15-20 parts of high-refractive-index filler, 1.1-1.5 parts of a dispersing agent, 0.2-0.3 part of a flatting agent, 0.3-0.5 part of a curing accelerator and 15-30 parts of a solvent. The high-refractive-index filler is one or more of titanium dioxide, zirconium oxide, zinc oxide and barium sulfate. The hollow silicon dioxide microspheres and the high-refractive-index filler are compounded, and meanwhile, backward scattering and surface scattering are combined, so that the scattering efficiency of the filler is greatly improved, the proportion of the filler can be reduced, and the thickness of the coating can also be reduced.

The invention relates to a controllable electrochemical etching strategy based on solubility product difference, in particular to a preparation method of a barium sulfate modified NiCo-LDH aqueous alkaline zinc battery positive electrode material, which comprises the following steps: firstly, dissolving 1, 4-phthalic acid and sodium hydroxide in a molar ratio of 1: 2 in water to obtain a solution A; dissolving barium nitrate pentahydrate, cobalt nitrate hexahydrate, nickel nitrate hexahydrate and ammonium fluoride in water according to a molar ratio of (0-1.5): 1: 4: 10 to obtain a solution B; the preparation method comprises the following steps: fully mixing the solutions, transferring the mixed solution into an autoclave containing foamed nickel (NF), and carrying out solvothermal reaction to obtain a tri-metal Co / Ni / Ba-MOF precursor (CNBx-BDC); cNBx-BDC is used as a working electrode, a platinum wire is used as a counter electrode, Hg / HgO is used as a reference electrode, 5-6M potassium hydroxide and 0.05-0.06 M sodium sulfate are used as electrolyte, a three-electrode system and a cyclic voltammetry method are adopted, electrochemical etching is carried out at the scanning rate of 20-30mV s <-1 > under the voltage range of 0-0.5 V, and the barium sulfate nanodot functionalized Co / Ni / Ba-LDH electrode (BS (at) CN-LDH) is obtained after six times of circulation. The unique porous structure can provide more electrochemical active sites and enhance electrolyte infiltration capacity, and the constructed heterostructure forms a strong built-in electric field, accelerates charge transfer, reduces ion diffusion energy barriers and improves energy utilization efficiency.

The invention relates to the technical field of preparation of barium sulfate powder, and discloses a preparation process of aluminum hydroxide modified barium sulfate powder, which comprises the following steps: constructing high-density sulfate radical active sites through argon plasma activation, and combining with a bio-based coupling agent to realize triple chemical bonding of barium sulfate and aluminum hydroxide; dynamically controlling hydrolysis of the aluminum salt by adopting microwave pulse in cooperation with a spiral microreactor to generate a nanoscale aluminum hydroxide uniform coating layer; supercritical CO2 is introduced to synchronously regulate and control the pH and the anti-solvent effect, side reaction is inhibited, and coating compactness is optimized; a closed-loop aluminum salt recovery system is combined to realize resource cyclic utilization; finally, the application performance of the powder is improved through hydrophobic treatment of magnesium stearate. Compared with a traditional acid pickling activation and continuous heating process, the chemical pollution risk is avoided, the bonding strength of a coating layer is improved by 60% or above, the utilization rate of aluminum salt reaches 98%, and the powder hydrophobicity and the plastic processing adaptability are remarkably optimized.

The invention discloses a composite friction material and preparation and application thereof in brake pads, the composite friction material takes phenolic resin as a matrix, and modified barium sulfate and red copper fiber are dispersed in the matrix; the modified barium sulfate is composed of barium sulfate particles and a coating layer on the surfaces of the barium sulfate particles, that is, the modified barium sulfate has a core-shell structure, and the coating layer comprises a UiO-66 metal organic framework material. Compared with the existing pure phenolic resin and a composite material only added with common barium sulfate particles, the composite friction material provided by the invention has remarkable advantages in the aspects of friction coefficient, thermal stability and wear resistance by introducing the modified barium sulfate, can reduce friction noise, and is suitable for being used as a brake pad material.

The invention provides sanding-free natural superfine barium sulfate powder as well as a preparation method and application thereof, and belongs to the technical field of inorganic chemical filler preparation. The preparation method comprises the following steps: sequentially carrying out grinding, ball milling and two-time grading on barite particles to prepare barite raw powder; and carrying out surface modification treatment on the barite raw powder, and cooling to obtain the sanding-free natural superfine barium sulfate powder. Wherein a composite modifier is added during surface modification treatment, and the composite modifier is prepared by compounding a stearic acid emulsion and a tetrakis-neo-alkoxy bis (didecyl phosphorous acid acyloxy) titanate coupling agent. The composite modifier modifies the barite raw powder, not only reduces the oil absorption value of the superfine barium sulfate, but also reduces the surface energy of the product through the bonding effect, improves the dispersity of the product and the adhesive force with downstream resin, and can achieve the use fineness required by the product through high-speed dispersion when being applied to the water-based industrial paint. And the production efficiency is effectively improved.