39 results about "Boron trioxide" patented technology

The invention discloses a method for intensively leaching chromium from vanadium extraction waste slag, and belongs to the field of metallurgical chemical industry. According to the method, diboron trioxide serves as a catalyst, vanadium extraction waste slag, sodium carbonate and sodium hydroxide serve as raw materials, the raw materials and the catalyst are mixed according to a set proportion, and leaching is conducted after roasting is conducted in a microwave muffle furnace. According to the method provided by the invention, the reaction can be promoted to be efficiently carried out at medium and low temperatures, the extraction rate of chromium can reach 95% or above, and the synergistic effect of'low addition amount-high catalytic efficiency 'can be realized under the condition that a small amount of catalyst is added.

The invention discloses a space anti-radiation glass cover sheet and a preparation method thereof, the glass cover sheet comprises the following raw materials by mass: 50-70 parts of silica, 5-15 parts of sodium oxide, 5-10 parts of lithium oxide, 5-10 parts of diboron trioxide, 3-10 parts of lead oxide, 2-6 parts of cerium oxide, 0.5-6 parts of potassium oxide, and 2-5 parts of alumina. According to the invention, PbO and CeO2 are added into the preparation raw materials, so that the radiation resistance of the glass cover plate is enhanced.

The invention relates to the technical field of ceramics, in particular to glazed foamed ceramic and bubble art glaze thereof. The oxide is prepared from the following chemical components in percentage by mass: 56 + / -2% of silicon dioxide, 9.0 + / -0.5% of aluminum oxide, 8.0 + / -1% of calcium oxide, 3.5 + / -1% of magnesium oxide, 5.5 + / -1% of zinc oxide, 12.0 + / -1% of potassium oxide, 3.5 + / -1% of sodium oxide, 2.5 + / -0.5% of diboron trioxide and 0-1.5% of colored metal oxide. The foaming agent raw materials comprise high-temperature decomposition type carbonate and high-temperature reaction type silicon carbide or silicon-oxygen-carbon. The glaze surface is devitrified, opacifying and matte, the carbonate foaming agent is completely decomposed and escaped on the glaze surface in the early stage to form a rough and uneven effect, silicon carbide or silicon-oxygen-carbon reacts in an oxidizing atmosphere at 1025 + / -25 DEG C to generate foaming gas, the foaming gas is matched with a boron element, and the temperature is rapidly increased to the highest firing temperature to promote glaze bubbles to break through the glaze surface to form open bubbles.

This invention discloses a radiation-resistant glass, its preparation method, and its application. The radiation-resistant glass comprises the following components in weight percentage: silicon dioxide 60%-70%; sodium oxide 13%-18%; zinc oxide 3%-6%; aluminum oxide 2%-6%; boron trioxide 1%-6%; strontium oxide 1%-3%; cerium dioxide 4.7%-5.5%; lanthanum trioxide / hafnium dioxide 1%-3%; and ammonium difluoride 0.3%-1%. The technical problem to be solved is to significantly improve the high-energy particle radiation protection and light transmittance of the glass by selecting a specific formulation.

The application provides a preparation method of a high-thickness low-temperature binder grinding roller needle ceramic grinding tool, and the binder is composed of 10-17% of superfine black clay powder, 35-45% of low-melting-point superfine glass material, 5-10% of nano silicon dioxide, 1-3% of superfine spodumene and 25-49% of superfine feldspar powder, and the low-melting-point superfine glass material is composed of 44-46% of silicon dioxide, 18-20% of aluminum oxide, 1-2% of magnesium oxide, 11-13% of sodium oxide and 16-20% of boron trioxide; the preparation method of the high-thickness low-temperature binder grinding roller needle ceramic grinding tool can reduce the sintering temperature during the production of the grinding tool, realize low-temperature sintering of the binder, avoid the situation that the high-thickness grinding tool is prone to collapse and black core at 1200-1300 DEG C, and reduce the production energy consumption.

The application relates to the technical field of ceramic substrates, and discloses a high-hardness alumina multilayer ceramic substrate which comprises the following components in parts by weight: modified alumina 100 parts, silicate 10-15 parts, sintering aid 5-8 parts, dispersant 2-5 parts, binder 6-8 parts and solvent 80 parts; the raw material of the modified alumina comprises alumina and a modifier in a weight ratio of 50:3-6; the modifier comprises polylactic acid and boron trioxide. Through the technical scheme, the problem of poor fracture toughness of the alumina multilayer ceramic substrate in the related art is solved.

This invention relates to a composite catalyst, its preparation method, and its application. The preparation method of the composite catalyst includes the following steps: S1: providing a composite support containing zirconium oxide and oxides of non-metallic elements; S2: doping the composite support with gadolinium to obtain a composite doped support; S3: doping the composite doped support with yttrium and other metallic elements; wherein the oxides of the non-metallic elements include one or more of silicon dioxide, boron trioxide, and phosphorus pentoxide; and the other metallic elements include one, two, or three of holmium, erbium, and thulium. The composite catalyst prepared according to one embodiment of this invention can be used in the urea hydrolysis reaction, enabling the urea hydrolysis reaction to proceed at a relatively low temperature, and the catalyst exhibits a high high-temperature activity retention rate.

This application relates to a conductive silver paste, an electrode, a solar cell, and a method for preparing the same. The conductive silver paste comprises a composite glass frit and conductive powder. The composite glass frit comprises lead monoxide, boron trioxide, silicon dioxide, and aluminum oxide, wherein the mass ratio α of silicon dioxide to aluminum oxide ranges from 1.5 to 2.5. The conductive powder comprises first conductive silver powder, second conductive silver powder, and conductive silver wire, wherein the size of the first conductive silver powder is less than 1 μm, and the size of the second conductive silver powder is larger than the size of the first conductive silver powder. The electrode formed by the conductive silver paste exhibits good bonding performance with the substrate, meeting the requirements for long-term stable operation of the solar cell.

The application discloses a kind of high tough silicate glass and its preparation method and application, by mass percentage, the high tough silicate glass includes: silicon dioxide 50~60%;Aluminum oxide 10~18%;Lithium oxide 3~8%;Sodium oxide 10~15%;Potassium oxide 1~3%;Magnesium oxide 0~4%;Zirconium oxide 0~3%;Cerium dioxide 0~6%;Boron trioxide 0~3%;Yttrium oxide 5~15%;Titanium dioxide 0.5~3%.The high tough silicate glass prepared in the application has the characteristics of high hardness (≥780 Hv), high bending strength (≥730 MPa) and good light transmittance in visible light region (≥90%), and is suitable for high reliability transparent structural parts, optical windows and protective glass and other fields.

Provided is a glass composition having a low transition temperature. The glass composition comprises the following components in percentage by weight: 52.5 to 66.0 percent of SiO2; 3.0 to 16.0 percent of B2O3 (boron trioxide); 9.0 to 22.0 percent of Al2O3 (aluminum oxide); srO: greater than 0% but less than or equal to 5.0%; li2O: greater than 0% but less than or equal to 8.0%; na2O: greater than 0% but less than or equal to 7.0%, wherein Al2O3 / B2O3 is 0.7-5.0. Through reasonable component design, the glass composition obtained by the invention has a relatively low transition temperature.

The invention discloses high-light-yield boron gadolinium silicate scintillation glass with a wide aluminum content range and a preparation method and application of the high-light-yield boron gadolinium silicate scintillation glass. The scintillation glass comprises a matrix and light-emitting central ions dispersed in the matrix, the boron-gadolinium silicate scintillation glass with the wide aluminum content range and the high light yield comprises a matrix and light-emitting central ions dispersed in the matrix, wherein the matrix comprises the following components in percentage by mass: 3-15% of silicon dioxide, 5-15% of silicon dioxide, 5-15% of silicon dioxide, and the balance of water. 4 to 11% of diboron trioxide; 50 to 70% of gadolinium oxide; 6-20% of gadolinium fluoride; 4-20% of aluminum oxide; 1-3% of gallium oxide; 2-5 parts of barium oxide; 0.5 to 1.5 percent of calcium oxide; the content of the luminescent central ions is 2-9%, and the sum of the proportions of the components is 100%. The gadolinium borosilicate scintillation glass is characterized in that gadolinium trioxide, silicon dioxide and diboron trioxide are used as main components, a large amount of aluminum oxide is added, so that the gadolinium borosilicate scintillation glass has high density, high light yield and high transmittance, and the preparation cost of the high-performance scintillation glass is remarkably reduced.

The application discloses a method for producing lithium manganese oxide as a positive material of lithium battery by dry mixing, which comprises the following steps: step one, uniformly mixing LiMnO4, manganese dioxide, nano niobium pentoxide, nano aluminum oxide, LiOH powder and boron trioxide at room temperature, and grinding to obtain a mixture; step two, stirring and mixing the mixture in step one and polyvinyl alcohol to obtain a powder mixture; step three, preparing an acidic solution by heating H2O and adding a mixture of prepared anhydrous ethanol and concentrated hydrochloric acid, and stirring to obtain the acidic solution; step four, taking part of the acidic solution and adding to the powder mixture in step two to obtain a suspension; step five, adding the remaining acidic solution into the suspension in step four, and heating to react in a sealed environment; after the reaction is completed, cooling the reaction product to obtain a crystal coated with emulsified glue; step six, sintering and screening the crystal in step five; and step seven, removing iron from the screened material to obtain a product.

This application provides a coating system and method for the inner wall surface of a nuclear fusion reactor, and a boronizing reaction system for a fusion device. The coating system includes an inlet assembly, a solid heating assembly, a solid container, and a discharge electrode. The solid container contains solid boron trioxide, and the discharge electrode is located on the inner wall of the reaction chamber of the nuclear fusion reactor. The solid heating assembly is used to heat the solid container. The inlet assembly is used to introduce hydrogen gas into the reaction chamber. The discharge electrode is used to generate positive ions containing boron compounds through glow discharge in the reaction chamber. The positive ions are accelerated in the sheath electric field at the interface between the plasma and the chamber wall, bombarding the inner wall of the reaction chamber to deposit and form a boron film. Boron trioxide, which is low-risk, low-toxicity, and low-cost, is used as a raw material to complete the boronizing coating, enabling the long-term, efficient, low-cost, and safe operation of the nuclear fusion reactor.

The invention provides a fiber reinforced polymer composition. The present invention relates to a fiber-reinforced thermoplastic molding composition comprising a thermoplastic polymer and reinforcing fibers wherein the composition comprises (i) a thermoplastic polymer selected from the group consisting of polyesters, polyamides, polycarbonates, polyphenylene sulfide (PPS), polyphenylene ether (PPO), polyetheretherketones (PEEK), polyaryletherketones (PAEK), polyamideimides (PAI), polyetherimides (PEI) and liquid crystal polymers (LCP), and combinations thereof, and (ii) a silicon-boron glass fiber consisting essentially of silicon dioxide (SiO2) and diboron trioxide (B2O3).

This invention discloses a high-strength and high-toughness glass, its preparation method, and its applications. The high-strength and high-toughness glass comprises the following components in weight percentage: silicon dioxide 65%-75%; boron trioxide 1%-4%; aluminum trioxide 3%-7%; lithium oxide 5%-10%; sodium oxide 2%-6%; potassium oxide 0%-2.5%; magnesium oxide 1%-5%; zirconium dioxide 3%-6%; phosphorus pentoxide 1%-3%; and cerium dioxide 4.5%-5.0%. The technical problem to be solved is to significantly improve the strength and toughness of the glass by selecting a specific formulation.

The invention discloses an indium sulfide doped 6.5-inch N-type indium phosphide single crystal and a preparation method thereof, and belongs to the technical field of semiconductor materials, the indium sulfide doped 6.5-inch N-type indium phosphide single crystal comprises the following raw materials: an InP polycrystal material, anhydrous diboron trioxide, red phosphorus and indium sulfide; the preparation method comprises the following steps: adding the raw materials into a crucible, and then putting the crucible into a quartz Dewar tube for melting and sealing; the quartz Dewar tube is placed in a single crystal furnace for heat treatment, and the indium sulfide doped N-type indium phosphide single crystal is prepared. According to the method, by strictly controlling the stoichiometric ratio and establishing an excellent single crystal growth preparation environment, the radial temperature gradient and the longitudinal temperature gradient of a polycrystalline material melt in a crucible are reasonable, the large-size high-quality N-type indium phosphide crystal with small internal stress and low dislocation density is grown, the resistivity is smaller than 1.08 * 10 <-3 > omega.cm, and the electron mobility exceeds 2680 cm < 2 > / V.s.

The application provides a glass bullet, a preparation method and application thereof. The glass bullet comprises the following raw materials: silicon dioxide, aluminum oxide, sodium oxide, boron trioxide, potassium oxide, magnesium oxide, zirconium dioxide, sodium sulfate and cerium oxide. The inorganic glass bullet of the application encapsulates a fiber grating on the surface to form a substrate carrying the fiber grating, and is applied to the field of fiber grating sensors. Compared with an epoxy resin adhesive encapsulation material, the inorganic glass bullet has the advantages of long service life, high strength, low expansion coefficient and the like.

The application relates to the technical field of solar cells, and particularly provides a method for removing boron trioxide in a furnace tube, which aims to remove the accumulated boron trioxide in the furnace tube at a low cost. The method comprises the following steps: placing a silicon wafer in the furnace tube, introducing oxygen into the furnace tube, and increasing the temperature to a preset temperature, so that the boron trioxide and the silicon wafer react, and after the gettering stopping condition is met, the furnace tube is cooled and the silicon wafer is taken out. According to the application, the boron trioxide in the furnace tube reacts with the silicon wafer at high temperature to obtain silicon oxide and boron atoms. Since the solid solubility of the boron atoms in the silicon oxide is higher than that in the silicon, the boron atoms can be adsorbed by the silicon oxide, so that the accumulated boron trioxide in the furnace tube is removed. The method is simple and convenient, the boron trioxide in the furnace tube can be adsorbed when the furnace tube is idle to avoid impurity accumulation, and a large amount of cost is not needed, so that the accumulated boron trioxide in the furnace tube is removed in time at a low cost.

The invention relates to the technical field of chemical synthesis, and particularly discloses a preparation method of lithium bis (oxalato) borate. The preparation method of lithium bis (oxalato) borate provided by the invention comprises the following steps: (1) uniformly mixing oxalic acid, a lithium source and an aprotic polar solvent, and controlling the temperature to be 20-40 DEG C during the period; then adding diboron trioxide, heating to reflux for water separation, and after the reaction is finished, cooling, filtering, leaching and drying to obtain a crude product; adding the crude product into a crystallization solvent, heating to 55-65 DEG C for dissolving, then cooling to 10-15 DEG C for devitrification, and filtering and drying to obtain a refined product. The novel process for preparing lithium bis (oxalato) borate, provided by the invention, has the advantages of high raw material conversion rate, less generated water and no corrosive gas, and is suitable for industrial production.

The invention relates to a method for preparing ferrosilicon from organic silicon solid waste, which comprises the following steps: (S1) pyrolyzing the organic silicon solid waste at 500-700 DEG C to obtain a pyrolysis product; (S2) crushing the pyrolysis product, and soaking the crushed pyrolysis product in a copper extraction solution composed of an inorganic acid solution and a hydrogen peroxide aqueous solution to obtain a leachate rich in Cu < 2 + > and residues rich in Si; (S3) mixing the Si-rich residues, an iron source, a carbon source and a fluxing agent to form a mixture; adding the mixture into a container preheated at 1400-1600 DEG C, raising the temperature to 1700-2000 DEG C for smelting to obtain ferrosilicon alloy liquid, and discharging and cooling to obtain ferrosilicon alloy; the fluxing agent is a compound of calcium fluoride and diboron trioxide. According to the method, the ferrosilicon alloy is prepared through the whole process of pyrolysis, dipping copper extraction, the specific fluxing agent and preheating type smelting forming, the yield is high, and harmless and resource utilization of organic silicon solid waste is achieved.

The application discloses a kind of steel identification traceability with high temperature ink and preparation method thereof, it is related to high temperature ink technical field, to solve the problem that prior art cannot meet the comprehensive application needs of steel high temperature online identification, low light high efficiency identification, by weight parts include: 20-30 parts rare earth glass frit powder, 5-10 parts inorganic pigment, 2-4 parts adhesion agent, 10-20 parts deionized water, 5-12 parts dispersing agent, 20-45 parts humectant, 0.05-0.15 parts defoaming agent, 0.05-0.15 parts PH regulator, 0.03-0.06 parts preservative;The melting temperature of the rare earth glass frit powder is 450-750 DEG C, and it includes by weight parts: 10-30 parts silicon dioxide, 5-10 parts aluminium oxide, 25-35 parts bismuth trioxide, 5-10 parts europium trioxide, 3-5 parts dysprosium trioxide, 5-10 parts boron trioxide, 3-8 parts calcium oxide, 2-4 parts strontium oxide, 1-3 parts magnesium oxide, 3-8 parts sodium oxide, 1-3 parts potassium oxide.The application has the advantages of enhancing the high temperature bonding performance of ink and low light color development and identification.

The invention discloses high-temperature-impact-resistant heat-resistant glass for an induction cooker and a preparation process of the high-temperature-impact-resistant heat-resistant glass, belongs to the technical field of induction cooker glass, and solves the problems of high-low-temperature alternate fragmentation, high-temperature residue scalding and poor dual-heat-source adaptation of a glass panel of a commercial open fire-electromagnetic dual-purpose stove. The glass comprises a first component, a second component and a third component, the first component comprises, by weight, 26-30 parts of high-purity quartz sand, 14-18 parts of boric anhydride and the like, and a basic heat-resistant framework is formed; the second component comprises 11-15 parts of Al2O3 coated modified submicron hexagonal boron nitride and the like, and plays a role in enhancing heat conduction; and the third component comprises 3-5 parts of yttrium oxide and the like and is used for assisting double-heat-source protection. The preparation process of the glass comprises the steps of raw material mixing, glass melt preparation, forming and annealing. The glass product prepared by the invention can tolerate a sudden change temperature difference of 400 DEG C or above, can quickly reduce the high temperature of 380 DEG C to a safe range, can adapt to double heat source characteristics of open fire 800 DEG C and electromagnetic 400 DEG C at the same time, and can effectively adapt to a commercial open fire-electromagnetic dual-purpose stove.

The present application relates to the technical field of glass fiber cloth preparation, and particularly relates to a low dielectric constant glass fiber cloth, and mass proportions of components respectively include: 68-74 parts of silicon dioxide, 18-23 parts of diboron trioxide, 3-5 parts of aluminum oxide, 0.8-1.5 parts of magnesium oxide, 0.3-0.7 parts of calcium oxide, 0.5-0.8 parts of zinc oxide, 0.25-0.8 parts of composite silane coupling agent, 0.05-0.3 parts of low-dielectric epoxy resin, 0.05-0.25 parts of low-dielectric polyphenyl ether resin, 0.03-0.15 parts of polytetrafluoroethylene micro powder and 0.02-0.1 parts of curing and functional additives. The present application realizes the super-low dielectric property without an extremely high-silicon and high-boron formula through the synergistic dielectric reduction mechanism of chemical modification and physical closed pore, and introduces air (dielectric constant = 1) through the core layer nano closed pore, and at the same time, the dense shell layer guarantees the fiber mechanical strength, and the super-low dielectric and high strength are realized.

The invention provides a preparation method of a large-size P-type indium phosphide single crystal, and belongs to the technical field of semiconductor materials. The preparation method comprises the following steps: sequentially filling an InP polycrystal material, elemental zinc, diboron trioxide and red phosphorus into a crucible, then putting the crucible into a quartz tube, vacuumizing the quartz tube, carrying out melt sealing to form a quartz Dewar tube, putting the quartz tube into a single crystal furnace, sealing, and starting a single crystal furnace heating system to generate the large-size P-type indium phosphide single crystal with the diameter of 6.5 inches. By strictly controlling the stoichiometric proportion of the crucible filler and establishing a good thermal field control process technology, the radial temperature gradient and the longitudinal temperature gradient in the polycrystal melt are more reasonable, the internal stress of the crystal is effectively reduced, the dislocation density is reduced, the dislocation density is smaller than 800 cm <-2 >, and the electron mobility exceeds 2800cm < 2 > / V.s.

This invention discloses a high-thermal-stability electrical porcelain glaze, the raw materials of which include quartz powder, potassium feldspar, kaolin, calcite, ferric oxide, barium oxide, titanium dioxide, boron trioxide, zirconium dioxide, and additives. The electrical porcelain glaze layer prepared by the method described in this invention, through the coordination between the various components, exhibits excellent heat resistance and strength.

The invention provides a method for intensively and synchronously extracting vanadium and chromium from high-chromium vanadium slag, and belongs to the field of metallurgical chemical industry. The preparation method comprises the following steps: by taking diboron trioxide, lanthanum trioxide and cerium dioxide as catalysts and taking high-chromium vanadium slag, sodium nitrate and sodium hydroxide as raw materials, roasting a mixed material by using a microwave muffle furnace to obtain roasted clinker; the roasted clinker is cooled, crushed, screened and leached again, and leaching liquid containing vanadium and chromium and leaching residues are obtained after solid-liquid separation; after the discharged slag is dried, weighing is carried out; and calculating to obtain the leaching rates of vanadium and chromium. According to the invention, the dosage of the catalyst is 0.25%-2% and is far lower than the dosage of 5%-8% of calcium chloride in the prior art, so that the medicament cost is reduced; and the alkali residue ratio can be reduced, the alkali salt consumption can be reduced, and the leaching rates of vanadium and chromium are still stabilized to be 96% or above. The method is focused on synchronous and efficient extraction of vanadium and chromium elements in the high-chromium vanadium slag, and is mainly used for raw material supply in the high-end fields of vanadium redox flow battery positive electrode materials, aerospace high-temperature alloys and the like.

The invention relates to the field of inorganic non-metallic materials, in particular to a multi-medium adaptive ceramic glaze formula design and a stability regulation and control process thereof, the ceramic glaze formula takes silicon dioxide and diboron trioxide as glass forming agents and alkali metal oxide as a fluxing agent, and zirconium oxide, tin oxide opacifier and nano titanium dioxide and lithium oxide functional additives are supplemented; the modified kaolin is prepared from the following components in percentage by weight: 69-77% of silicon dioxide, 3-8% of diboron trioxide, 8-15% of alkali metal oxide, 3-10% of alkaline earth metal oxide, 6-8% of opacifier and 2-6% of functional additive, and kaolin is modified by introducing a cation replacement method. According to the stability regulation and control process, by controlling the melting temperature to be 950-1300 DEG C and the heat preservation time to be 20-60 min and combining energy-saving technologies such as microwave sintering and waste heat recovery, the adaptability and structural stability of the ceramic glaze on the surfaces of different base materials such as metal, ceramic and plastic are achieved. The coating has the advantages of low-temperature fast firing, high corrosion resistance, environment friendliness, no heavy metal and the like, and can be widely applied to the fields of industrial coatings and decoration.

This invention belongs to the technical field of resistive electrical components, and specifically relates to a method for preparing a zinc oxide resistor with high gradient and high current flow stability. The zinc oxide resistor comprises: zinc monoxide, bismuth trioxide, antimony trioxide, nickel trioxide, manganese tetroxide, cobalt tetroxide, tin dioxide, boron trioxide, nano-silver powder, aluminum nitrate nonahydrate, barium acetate, binder, dispersant, and deionized water. The zinc oxide resistor designed in this invention has the advantage of good stability under high gradient and high current flow, overcoming the degradation behavior of existing zinc oxide varistors caused by the influence of high current surge impact on the zinc monoxide grain boundary barrier, and is suitable for industrial application.

This invention provides a 43 kg grade weathering steel welding electrode, comprising a core and a coating wrapped around the core. The coating comprises the following components by mass percentage: 30-40% marble, 20-30% fluorite, 3-7% sodium fluoride, 1-3% zircon sand, 3-7% rutile, 2-4% quartz, 2-4% 45# atomized ferrosilicon, 1.5-3% metallic manganese, 1.4-2.5% nickel-magnesium alloy, 0.7-1.5% metallic chromium, 0.6-1.2% copper powder, 0-1.5% silicon-zirconium iron, 0.3-0.7% boron trioxide, 0-1% soda ash, 0-1% CMC, with the balance being iron powder. This welding electrode transfers appropriate amounts of Ni, Cr, Cu, and Si elements to the weld metal through its coating, giving the weld metal excellent weather resistance, with a weather resistance index (I) greater than 6.5. Simultaneously, by adjusting the coating composition, the content of C, Mn, Si, and other alloying elements in the weld metal is controlled, ensuring a tensile strength of 430–550 MPa and a low-temperature impact absorption energy of over 47 J at -20°C, exhibiting stable mechanical properties.

The application relates to the technical field of lead-free coating, and discloses a lead-free coating applied to a resistor and a preparation method thereof. After cold pressing, ball milling and heat treatment, mixed powder is prepared from bismuth trioxide, aluminum trioxide, boron trioxide, potassium oxide and calcium fluoride. Grafted nano-silicon dioxide is prepared by grafting hyperbranched polyesters prepared from polymeric esters prepared by polymerization of acrylic acid, polyurethane and chitosan. Modified hydroxyethyl cellulose is prepared by modification of dodecylpyridine bromide. The lead-free coating prepared by the application has good explosion-proof performance, can not be cracked in the conversion process of low pressure and high pressure, the adhesion is greatly improved, the lead-free coating is not easy to fall off in the use process, the service life is prolonged, the lead-free coating has good hydrophobic performance and is easy to clean. The process is simple, harmful pollutants are not easy to be generated, and the process meets the green production requirement.