377 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 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 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 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 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 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 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 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 relates to a preparation method of a liquid metal reinforced radiation shielding coating material, and belongs to the technical field of radiation shielding materials. The liquid metal is subjected to ball milling for a period of time at a certain rotating speed under the nitrogen protective atmosphere to enable the particle size to be 1t; 10 [mu] m; then the liquid metal is placed in a silane coupling agent solution according to a certain solid-to-liquid ratio and runs in a constant-temperature oscillator at a certain oscillation frequency for a period of time, and the surface of the liquid metal is coated with a layer of siloxane for modification treatment; weighing the modified liquid metal and barium sulfate according to a certain mass ratio, and carrying out ball milling in a planetary stirrer at a certain ball milling rate so as to uniformly mix the modified liquid metal and the barium sulfate; and mixing the obtained mixture with talcum powder and water according to a certain mass ratio, and uniformly stirring to obtain the liquid metal reinforced base radiation shielding coating material. The modified liquid metal is uniformly distributed in the barium sulfate matrix to serve as the composite coating, so that the lead equivalent and the radiation shielding performance are remarkably improved.

This invention discloses a colored radiation-cooling coating based on a transparent composite film and its preparation method, belonging to the technical field of colored radiation-cooling coatings for building energy conservation. The colored radiation-cooling coating based on a transparent composite film includes a surface transparent composite film layer and a bottom radiation-cooling composite layer. The bottom layer is prepared from components A and B. Component A includes transparent resin and radiation-functional fillers; the radiation-functional fillers include barium sulfate particles and hollow structured dielectric microspheres. The surface layer is prepared from components A1 and B. Component A1 includes transparent resin, a light stabilizer, and an ultraviolet absorber. The colored radiation-cooling coating based on a transparent composite film allows the radiation-cooling coating to display different colors without affecting its solar reflectivity. Simultaneously, the combination of the radiation-cooling composite layer and the transparent composite film layer improves the radiation reflection performance of the radiation-cooling coating.

The invention relates to food contact safety type water-based single-component gradient barrier acrylic acid industrial anticorrosive paint with heterostructure topology as well as a preparation method and application of the food contact safety type water-based single-component gradient barrier acrylic acid industrial anticorrosive paint. The coating is mainly prepared from the following components: a zinc molybdate / bentonite compound, triethanolamine, deionized water, titanium dioxide, barium sulfate, an ammonium polyacrylate dispersing agent, acrylic resin, a polyether modified polysiloxane wetting agent, hydroxyethyl cellulose ether, a non-silicon mineral oil defoaming agent, propylene glycol phenyl ether and 1, 3-propylene glycol. A three-dimensional interpenetrating network is constructed through charge-driven self-assembly of branched acrylic resin and zinc molybdate / bentonite, a corrosive medium is forced to diffuse along a zigzag path, and compared with a traditional homogeneous coating, the retarding efficiency is improved; and meanwhile, a Fe-OOCR chelating passivation layer is generated in situ by utilizing selective enrichment of carboxyl functional groups on a metal base material interface, and a multi-stage physical barrier is formed by combining gradient distribution of the titanium dioxide-barium sulfate core-shell filler, so that geometric blocking and energy dissipation of a corrosion medium permeation path are realized.

The invention relates to the technical field of coating preparation, and particularly discloses a coating prepared from modified carbon black, which is prepared by adding a zinc or aluminum compound in a carbon black manufacturing process to prepare an aluminum / carbon black compound and a zinc / carbon black compound, and then preparing the aluminum / carbon black compound and the zinc / carbon black compound according to different proportions to obtain modified carbon black. And preparing coatings with different properties from the epoxy resin, a dispersing agent, a solvent, mica powder, barium sulfate, fumed silica, a flatting agent, a defoaming agent and polyamide. The coating prepared from the modified carbon black has higher corrosion resistance, ageing resistance, insulating property, hardness and wear resistance.

The invention relates to the technical field of waterproof materials, and particularly discloses an acrylic acid waterproof coating and a preparation method thereof. The acrylic acid waterproof coating provided by the invention is prepared from the following raw materials: a weather-resistant high-elastic emulsion, a modified filler, an auxiliary agent and water, the weather-resistant high-elasticity emulsion is prepared from the following raw materials: high-elasticity acrylic emulsion, vinyl-terminated hydroxyl-terminated fluorine-containing silicone oil, diisocyanate and dihydric alcohol; the modified filler is prepared from the following raw materials: barium sulfate, wollastonite, oleic acid modified titanium dioxide, an anionic dispersant and 2-ethylhexyl diphenyl phosphate; the auxiliary agent is prepared from cyclohexane-1, 2-dicarboxylic acid diisooctyl ester. Through the design of the weather-resistant high-elastic emulsion and the modified filler, and in cooperation with the specific plasticizer and other auxiliaries, the comprehensive properties such as adhesive force, water resistance, weather resistance and low temperature resistance of the acrylic waterproof coating are improved.

The invention belongs to the technical field of coating preparation, and particularly relates to a reflective heat-insulation polyurethane coating and a preparation method thereof.The reflective heat-insulation polyurethane coating is prepared from, by mass, 30%-50% of waterborne polyurethane, 11%-18% of a reflective heat-insulation composite material, 5%-7% of rutile type titanium dioxide, 3%-7% of nano barium sulfate, 1%-5% of a defoaming agent, 0.2%-0.5% of a flatting agent and the balance water; the specific preparation method comprises the following steps: adding the waterborne polyurethane, the reflective thermal insulation composite material, the rutile type titanium dioxide, the nano barium sulfate, the defoaming agent and the flatting agent into water, and uniformly stirring and dispersing to obtain a reflective thermal insulation polyurethane coating; according to the coating prepared by the method, the dispersing performance is effectively improved, the uniformity is ensured, the surface tension of the coating is reduced, the conditions of shrinkage cavities and pinholes after film formation of the coating are effectively controlled, and the heat insulation performance is effectively improved through the modes of reflection, heat insulation and radiation refrigeration.

The invention discloses a marine polyethylene insulated cable material and a preparation method thereof, and relates to the technical field of cable materials. According to the invention, the p-hydroxycinnamyl alcohol modified low-density polyethylene is taken as a core, and a rigid benzene ring is introduced, so that the anti-aging performance and the mechanical performance of the polyethylene cable material are remarkably improved; then polyimide is attracted by hydroxyl to coat the surface of the cable, so that the waterproof and corrosion-resistant performance of the cable is improved; and then blending with the modified filler and the 5-methoxy-2-methylphenol, so that the mechanical property of the cable is improved, and the corrosion resistance and the waterproof effect are realized at the same time. The modified filler takes prismatic barium sulfate particles as a raw material, so that the mechanical property of a polymer is remarkably improved, and the ageing resistance of the cable material is enhanced by matching with barium sulfate; and 4-methacryloxybenzophenone and ethylene are polymerized to form an anti-ultraviolet liquid with certain viscosity, and barium sulfate particles are in different orientations under ultrasonic oscillation by virtue of the viscosity of the anti-ultraviolet liquid, so that the mechanical property and photo-thermal aging resistance of the cable are improved.

The invention belongs to the technical field of inorganic flame retardants, and provides a weather-resistant inorganic flame retardant and a preparation method thereof. The preparation method comprises the following steps: pretreating magnesium hydroxide, and then immersing the pretreated magnesium hydroxide into a silane coupling agent solvent for modification treatment to obtain modified magnesium hydroxide; mixing barium sulfate with a modifier, and carrying out modification treatment to obtain modified barium sulfate; and mixing the modified magnesium hydroxide, the modified barium sulfate and white carbon black to obtain the weather-resistant inorganic flame retardant. The method is simple and mild in condition, the prepared weather-resistant inorganic flame retardant greatly improves the dispersity and interfacial compatibility of magnesium hydroxide in an organic phase, and the weather-resistant inorganic flame retardant also has excellent weather resistance, flame retardance and aging resistance and has a wide application prospect in the field of flame retardance.

The present invention relates to the technical field of metal coatings, and specifically relates to a high-temperature resistant metal coating and its preparation process. In the present invention, first, acrylic acid and 1,1,3,3-tetramethyldisiloxane are used as raw materials to prepare intermediate A, and diethanolamine, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, and paraformaldehyde are reacted to obtain intermediate B; intermediate A and intermediate B are reacted at a molar ratio of 1:2 to obtain a silicon-containing flame-retardant diol; then polytetrahydrofuran ether diol 2000 and the silicon-containing flame-retardant diol are mixed and reacted with isophorone diisocyanate and chain-extended to obtain a modified polyurethane emulsion; the modified polyurethane emulsion, deionized water, wetting agent, defoaming agent, dispersant, titanium dioxide, barium sulfate powder, zinc phosphate, leveling agent, and thickening agent are mixed and stirred to obtain a high-temperature resistant metal coating.

The invention discloses a method for simultaneously determining total barium and sulfur in barite by inductively coupled plasma emission spectrometry. In this method, the sample is decomposed by melting with sodium carbonate and sodium hydroxide. The molten slag is extracted with hot water, nitric acid and a chromium internal standard solution are added, the crucible and the beaker are washed with dilute hydrochloric acid, water is added and shaken well, heated to boiling gently on a hot plate and then taken off and shaken well. After cooling, it is determined on an inductively coupled plasma emission spectrometer. The method of the invention makes use of the characteristic that barium sulfate has a relatively large solubility in reverse aqua regia, enabling barium and sulfur to coexist stably, and then simultaneously determines total barium and sulfur by inductively coupled plasma emission spectrometry, which has the characteristics of high detection efficiency, high precision, simple operation and low cost, and solves the technical problems that when determining total barium and sulfur in barite by traditional methods, sulfur and barium are difficult to coexist in the solution, usually two different methods are required to complete the determination, and even barium and sulfur need to be separated in advance, resulting in a long process and low detection efficiency.

The invention discloses a passive radiation-cold storage composite box body and a preparation method. The box body sequentially comprises a composite radiation film, a heat insulation layer and a cold storage layer from outside to inside. The outer-layer radiation film is composed of an elastic organic matrix and high-reflection inorganic particles such as barium sulfate, has high solar reflectivity and mid-infrared high emissivity, and can effectively restrain solar absorption and achieve radiation heat dissipation in the daytime. The heat insulation layer is made of XPS, EPS, aerogel felt and other low-heat-conduction materials so as to reduce external heat transfer. Phase change microcapsules are dispersed in the cold storage layer, and flake graphite and other high-thermal-conductivity fillers can be added to improve the cold transfer efficiency and temperature uniformity. And the phase-change material realizes automatic cold storage and cold release through a latent heat mechanism, so that the temperature in the box body is kept stable. Through the synergistic effect of radiation refrigeration, heat insulation and phase change cold storage, long-time and recyclable passive cold chain temperature control is achieved, and the device has the advantages of being simple and convenient in structure, high in cost performance, flexible in application, uniform in internal temperature distribution and the like.

The invention belongs to the technical field of experiments and the field of anatomical research, and particularly relates to a self-developing vascular casting agent and a preparation method thereof. The invention discloses a preparation method of a self-developing vascular casting agent. The self-developing vascular casting agent is obtained by uniformly mixing iopromide, natural latex, II-type barium sulfate and pigment, wherein in parts by weight, the iopromide accounts for 30-40%; 25%-30% of natural latex; 40% of type II barium sulfate; and 5%-10% of pigment. The blood vessel casting agent developed by the invention is excellent in formula flowability (smooth perfusion), does not cause blockage, can avoid reverse osmosis of a capillary microenvironment, and realizes arteriovenous differentiated perfusion; and meanwhile, high-contrast development is realized, and complete coverage of capillary vessels is basically realized. The optimized blood vessel casting agent formula is completely cured (at room temperature) within 24 hours, the shrinkage rate is low, and blood vessel deformation is avoided.

The application discloses an environment-friendly black liquid photosensitive ink without 907 and 369 photosensitizers, which is composed of the following components in parts by weight: epoxy propylene acid resin 30-50 parts, photosensitizer 205 3-4 parts, photosensitizer 360 6-7 parts, photoinitiator 184 2-4 parts, superfine silicon powder 5-10 parts, superfine barium sulfate 20-30 parts, liquid chelating agent 1-3 parts, modified bentonite 15-30 parts, and organic silicon defoaming agent 5-10 parts. The application introduces long-wave environment-friendly photosensitizers for the first time, changes the structural defects of the traditional black system using 369 and 907 high carcinogenic photosensitizers to only meet short-wave length and insufficient deep curing of the ink, strengthens the deep curing effect of the carbon black photosensitive ink, improves the solder mask bridge manufacturing capacity of the carbon black photosensitive ink from 4 mil to 2 mil, and realizes secondary development. The product is high in efficiency and environmental protection and high in economic benefits, fully meets the European Union standard, and is mainly supplied to the European Union market.

This application discloses a water-based sand texture paint and its preparation method, belonging to the field of water-based paint technology. The water-based sand texture paint of this application, based on 100% of the total mass of the water-based sand texture paint, includes: 1-1.5% mixed corrosion inhibitor, 1.5-3.5% film-forming aid, 10-15% water-soluble acrylic resin, 15-20% hydroxyl acrylic dispersion, 10-15% polyurethane dispersion, 10-15% precipitated barium sulfate, 10-15% glass micro powder, 0.2-0.5% coupling agent, 0.2-0.3% wetting agent, 0.3-0.5% dispersant, 0.1-0.3% defoamer, 5-10% color paste, 0.2-0.5% bentonite, 0.3-2.5% thickener, 5-7% sand texture powder, 8-10% expanded graphite, 0.5-1.5% activation period extender, and 15-20% water. The water-based sand texture paint prepared using the formula and preparation method of this application has a low odor during the coating process, is non-flammable and non-explosive, and has low toxicity, making it more suitable for widespread use, especially for use in the luggage compartment of passenger cars, with a wide range of applications.

The present invention relates to a method for recovering valuable materials from waste. The method for recovering valuable materials from waste comprises the steps of: (a) pulverizing waste, which is generated from an evaporator or a crystallizer among equipment of a zero liquid discharge process for desulfurization wastewater, and then injecting same into a dissolution tank so as to dissolve same in a solvent and separating same into a gypsum (CaSO4) precipitate and a supernatant from which the gypsum has been removed; (b) dissolving, in a desulfurization tank, barium chloride (BaCl2) in the supernatant from which the gypsum has been removed, and separating same into a barium sulfate (BaSO4) precipitate and a supernatant from which the barium sulfate has been removed; (c) dissolving, in a hydroxide tank, sodium hydroxide (NaOH) in the supernatant from which the barium sulfate has been removed, and separating same into a magnesium hydroxide (Mg(OH)2 precipitate and a supernatant from which the magnesium hydroxide has been removed; and (d) injecting, into a salt pond, the supernatant from which the magnesium hydroxide has been removed, so as to recover sodium chloride (NaOH).

The invention discloses a production and preparation process of a heavy-duty water-based epoxy primer applicable to a high-salt and high-humidity environment, and relates to the technical field of production of water-based epoxy primers. Comprising the following raw materials in parts by mass: 30-50 parts of bisphenol A type water-borne epoxy resin emulsion, 10-20 parts of a curing agent T-31, 3.5-5 parts of a reinforced anti-settling agent, 8-12 parts of zinc phosphate, 5-8 parts of aluminum triphosphate, 10-15 parts of precipitated barium sulphate, 3-6 parts of silica powder, 0.8-1.2 parts of a sodium polyacrylate dispersing agent, 0.4-0.8 part of an organic silicon defoaming agent and 0.3-0.7 part of an acrylate flatting agent. And 0.6-1 part of a polyurethane thickening agent. The bentonite and the modified zirconium phosphate silicate powder in the reinforced anti-settling agent can improve the microstructure of the primer in a primer system, so that a coating is more compact and can be conveniently applied to a high-salt and high-humidity environment, and the salt spray resistance of the waterborne epoxy primer is enhanced.

This invention discloses a fissure grouting material, its preparation method, and its application, belonging to the technical field of radiation protection engineering materials. By mass, its raw materials include: 45-60 parts barite sand, 25-35 parts sulfoaluminate cement, 8-20 parts borax, 2-5 parts boron carbide powder, 1-5 parts nano-gadolinium oxide, 5-15 parts lithium slag powder, 3-8 parts barium sulfate whiskers, 3-8 parts polymer emulsion, 0.5-1.5 parts water-reducing agent, 0.1-0.5 parts stabilizer, and 18-25 parts water. This invention provides high-density gamma-ray shielding through barite sand, achieves all-round neutron protection through a quaternary composite neutron absorption system, enhances the material's toughness and shielding effect through barium sulfate whiskers, and ensures high fluidity and interfacial bonding strength of the grout through the polymer emulsion. This material is particularly suitable for sealing and shielding fissures in the surrounding rock of radioactive tunnels, possessing advantages such as excellent shielding effectiveness, good construction performance, high volume stability, and long-term durability.