76 results about "Boron trioxide" patented technology

An ultra-thin flexible glass and its preparation method belong to the technical field of glass manufacturing. The raw materials of the ultra-thin flexible glass are composed of silicon dioxide, aluminum oxide, sodium oxide, boron trioxide, calcium oxide, lithium oxide, a composite toughening agent, a composite flux, and a composite fining agent. The ultra-thin flexible glass prepared by the present invention has an ultimate bending radius of 2-3 mm, a maximum number of bending times of 350,000-360,000 times, a surface compressive stress of 916-937 MPa, a Vickers hardness of 610-623 MPa, and an elastic modulus of 79-82 GPa.

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 self-healing basalt fiber reinforced copper-based friction material and a preparation method thereof, and relates to the technical field of friction materials, the self-healing basalt fiber reinforced copper-based friction material comprises the following raw material components by mass: 0-1.5 wt.% of graphene, 0-2 wt.% of boron, 0-4 wt.% of diboron trioxide, 0-10 wt.% of graphite, 0-5 wt.% of titanium powder, 0-4 wt.% of copper-plated basalt fiber and 84.75-94.75 wt.% of copper powder. And preparing the self-healing basalt fiber reinforced copper-based friction material by adopting a vacuum hot pressing sintering process. In a preparation process and a use scene of the material, temperature rise enables the self-healing components to be melted and softened, so that the self-healing components are filled in pores or cracks between a reinforced phase and a matrix, the material generates a self-healing effect of self-repairing, and meanwhile, the material has very good mechanical properties and friction properties.

The application relates to the technical field of ceramic materials, and discloses a low-dielectric-loss aluminum nitride ceramic substrate and a preparation method thereof. The low-dielectric-loss aluminum nitride ceramic substrate comprises the following components by weight: 80-90 parts of aluminum nitride, 6-8 parts of a sintering aid, 3-5 parts of a toughening agent, 3-4 parts of a composite aid, 6-10 parts of a binder, 6-8 parts of a dispersing agent and 60-70 parts of a solvent; the composite aid comprises boron trioxide, calcium fluoride and lithium carbonate. The technical scheme solves the problem of high dielectric loss of the aluminum nitride ceramic substrate in the related art.

A glass composition includes silicon dioxide, aluminum oxide, diboron trioxide, fluorine, zinc oxide, a first component including calcium oxide, and a second component including zirconium dioxide and manganese oxide. Based on 100 wt % of the glass composition, the silicon dioxide is present in an amount ranging from 52 wt % to 62 wt %, the aluminum oxide is present in an amount ranging from 8 wt % to 13 wt %, the diboron trioxide is present in an amount ranging from 19 wt % to 31 wt %, and the fluorine is present in an amount of greater than 0 wt % and not greater than 2 wt %. Based on 100 wt % of the glass composition, the zinc oxide is present in an amount of equal to or greater than 0 wt % and less than 0.25 wt %. A glass or a glass fiber including the glass composition, and a product including the glass fiber are also provided.

The invention discloses a thermite formula for coating a ceramic layer in a steel pipe and a preparation method of the thermite formula, and relates to the technical field of steel pipe lining metal ceramic, the formula comprises aluminum powder, ferric oxide, silicon dioxide and oxygen, and further comprises copper oxide and diboron trioxide, the content of oxygen is smaller than the amount of oxygen consumed when the aluminum powder is completely oxidized, and the content of silicon dioxide is smaller than the amount of copper oxide consumed when the aluminum powder is completely oxidized. When the oxygen participating in the reaction is exhausted, aluminum which does not participate in the oxidation reaction exists. According to the invention, by adding the diboron trioxide and the copper oxide, a traditional metal ceramic lining steel pipe combined in a mechanical mode can be improved into a metal ceramic inner covering steel pipe combined in a brazing mode, so that the binding force of the inner covering layer and the base pipe is improved, and the surface flatness of the inner covering layer is improved so as to reduce the fluid conveying resistance; the metal ceramic internally-coated steel pipe manufactured through the formula and the specific implementation method has the advantages of being high in bonding force between the internally-coated layer and the base pipe, smooth in surface, resistant to high temperature and high pressure and resistant to corrosion.

The application discloses a method for preparing high-temperature-resistant and anti-degradation well cementing material by using high-aluminum and high-silicon solid wastes, and the content of each component in the raw material is calculated according to the total mass of 100%, and the content of glass is 32-48%, the content of waste ceramic is 30-45%, the content of aluminum oxide is 15-25%, the content of boron trioxide is 1.1-4.8%, the content of alkaline earth metal oxide is 1.6-4.6%, the content of alkali metal oxide is 0.7-4.6%, the content of zirconium oxide is 0.8-5%, the content of zinc oxide is 0.4-2%, and the content of phosphorus pentoxide is 0.4-2%. The raw material is crushed, ground and grinded, the high-silicon aluminum precursor particles prepared by physical methods, chemical methods or the combination of both are pretreated, high-temperature spheroidized and surface-coated, so that the high-temperature-resistant and anti-degradation spherical additive product is prepared. The product has the excellent performances of high sphericity, good fluidity, small friction resistance, easy mixing, simple use and the like; the high-temperature resistance and anti-degradation are obvious under the well condition that the bottom hole static temperature is 150-300 DEG C, and the cement stone strength is obviously improved.

The invention belongs to the technical field of resistor electrical elements, and particularly relates to a zinc oxide resistor with high stability and low cost and a preparation method thereof. The zinc oxide resistor comprises the following components: large-particle-size zinc oxide elementary substance powder, small-particle-size zinc oxide elementary substance powder, bismuth trioxide, bismuth stannate, nickel monoxide, manganous-manganic oxide, cobaltosic oxide, nano tin powder, diboron trioxide, nano silver powder, a binder, a dispersant and deionized water. The invention provides the preparation method of the resistor disc with low cost and high through-current impact stability, large through-current is realized, the stability is relatively good after large-current pulse surge impact, the cost is low, the resistor disc can meet the application requirements of more occasions, the cost is low, and the resistor disc is suitable for industrial popularization.

The utility model provides a film-coated cover plate and an electronic device comprising the same, the film-coated cover plate comprises a cover plate body, the upper surface of the cover plate body comprises a titanium nitride layer, a diboron trioxide layer and a lead oxide layer which are laminated; wherein the thickness of the titanium nitride layer is 50-100 nm, the thickness of the diboron trioxide layer is 150-200 nm, and the thickness of the lead oxide layer is 30-80 nm. According to the utility model, the titanium nitride bottom layer is plated on the cover plate, so that excellent wear resistance is provided, and the glass substrate can be protected from being scratched and worn. And by introducing diboron trioxide and lead oxide, the optical performance of the coating layer can be adjusted, so that specific optical requirements are met. Meanwhile, titanium nitride and diboron trioxide have good chemical stability and can protect the glass substrate from chemical corrosion. Therefore, the film-coated cover plate provided by the utility model can realize multiple functions by adjusting the thickness and composition of each layer.

The invention discloses a preparation method of a cyanoborate lithium salt derivative, which comprises the following steps: 1, mixing an alcohol compound, a lithium source compound, a boron source compound and trimethylsilyl cyanide in a polar organic solvent, and filtering after complete reaction to obtain a cyanoborate crude product filtrate; the alcohol compound is selected from one of 2, 2, 2-trifluoroethanol, 2, 2-difluoroethanol, 2-fluoroethanol, 3-hydroxypropionitrile, allyl alcohol and propargyl alcohol; the lithium source compound is selected from one of lithium carbonate and lithium hydroxide; the boron source compound is selected from one of boric acid, diboron trioxide and boron tribromide; the reaction temperature is controlled to be 0-120 DEG C; and 2, adding an inert organic solvent into the cyanoborate crude product filtrate for crystallization, and performing vacuum drying to obtain a finished product of the cyanoborate lithium salt. The method has the advantages of high yield and purity, simple process, convenience in operation and low cost, and is extremely suitable for industrial production.

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 utility model relates to the technical field of boric anhydride recovery in flue gas, and discloses a device for recovering and filtering boric anhydride in flue gas, which comprises a body, a base and a mounting bolt, the outer surface of the body is provided with a cover plate, the outer surface of the cover plate is connected with a gas inlet pipe in a penetrating manner, and the outer surface of the body is communicated with a liquid inlet pipe; according to the device for recovering and filtering boric anhydride in flue gas, absorption liquid is injected into the body through the liquid inlet pipe, the output end of the gas inlet pipe is located in the absorption liquid, flue gas is absorbed and filtered in the absorption liquid under the flow guide of the gas inlet pipe, and boric anhydride and particulate matters after filtration are deposited at the bottom of the body, so that the boric anhydride in the flue gas is recovered and filtered. And after treatment is finished, a servo motor is controlled to operate, a spiral auger and a scraping plate are driven to synchronously operate, filtered objects adhered to the interior of the body and the inner wall of the connecting pipeline are scraped off, and finally the filtered objects are discharged from a discharging guide piece, so that the effect of conveniently cleaning deposited pollutants and adhered to the inner wall of the filtering device is achieved.

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.

The invention discloses a light magnesium-calcium-boron compound and a preparation method thereof. The method comprises the following steps: calcining calcium hydroxide at 400-800 DEG C to obtain calcium oxide; the preparation method comprises the following steps: sequentially adding Ca (OH) 2, diboron trioxide and magnesium oxide into pure water, stirring to form slurry, adding calcium oxide in batches, and promoting reaction by utilizing hydration heat release of calcium oxide; and stirring and dispersing the slurry at a high speed, drying and crushing to obtain a target compound. The obtained product is ternary composite powder and comprises, by oxide, 20%-40% of B2O3, 30%-50% of CaO and 10%-40% of MgO, the particle size D50 is not larger than 50 micrometers, and the apparent specific volume is not smaller than 3.0 cm / g. The method is mild in process and simple and convenient to operate, and the prepared compound is fine in particle, uniform in distribution, good in dispersity, stable in storage and transportation, suitable for the fields of fertilizers, rubber and plastic, flame-retardant additives and the like and good in industrial application prospect.

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.

The invention relates to ultrathin flexible glass and a preparation method thereof, and belongs to the technical field of glass manufacturing, the ultrathin flexible glass comprises the following raw materials: silicon dioxide, aluminum oxide, sodium oxide, diboron trioxide, calcium oxide, lithium oxide, a composite flexibilizer, a composite fluxing agent and a composite clarifying agent; according to the ultrathin flexible glass prepared by the invention, the limit bending radius is 2-3mm, the maximum bending frequency is 35,000-360,000, the surface pressure stress is 916-937MPa, the Vickers hardness is 610-623MPa, and the elastic modulus is 79-82GPa.

The invention belongs to the field of glass manufacturing, and discloses a high borosilicate glass tube and a continuous hot press molding process thereof.The high borosilicate glass tube comprises a tube body, and the tube body comprises the following raw materials in percentage by weight: 10-20% of glass powder, 10-20% of glass powder and 10-20% of glass powder. Comprising 18%-19% of diboron trioxide, 3%-4.5% of aluminum oxide, 2%-4% of zinc oxide, 1%-2% of sodium oxide, 0.5%-1.5% of potassium oxide, 0.5%-2% of gallium oxide, 0.1%-1.5% of lanthanum oxide, 0.1%-1% of yttrium oxide, 0.05%-0.3% of cerium oxide, 0.02%-0.1% of nano titanium carbide and the balance silicon dioxide. The wall thickness of the pipe body is 0.8-2.0 mm, the outer diameter of the pipe body is 10-50 mm, the wall thickness of the pipe body is 0.8-2.0 mm, and the outer diameter of the pipe body is 10-50 mm; the invention aims to provide a high borosilicate glass tube with lower thermal expansion coefficient and higher chemical stability and mechanical strength, and a continuous hot press molding process capable of realizing efficient and stable production and improving product quality.

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.

The present invention relates to the field of powder fire extinguishing agents, and particularly to a Class D dry powder fire extinguishing agent, a preparation method thereof and an application thereof. The Class D dry powder fire extinguishing agent of the present invention comprises the following components in percentage by weight: 58-63% of sodium chloride; 25-35% of inorganic non-metallic powder; 4-10% of flow aid; 1-4% of moisture-proof agent; wherein, the preparation method of the inorganic non-metallic powder comprises: mixing 19-25% of silicon dioxide, 18-22% of boron trioxide and 57-63% of lead oxide in percentage by weight, melting and mixing evenly, water quenching, drying and ball milling to obtain the inorganic non-metallic powder. It effectively improves the powder fluidity of the Class D dry powder fire extinguishing agent, improves the compactness and hardness of the outer shell formed after the interaction with the combustible in the fire extinguishing process, thereby improving the wall adhesion effect of the Class D dry powder fire extinguishing agent to better cope with the wall surface at a certain angle to the horizontal plane, especially the magnesium fire on the vertical wall surface.

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.

The present invention discloses a stain-resistant porcelain insulator glaze. The raw materials for the glaze include potassium feldspar powder, quartz powder, calcium carbonate, boron trioxide, barium carbonate, zirconium silicate, calcium oxide, magnesium oxide, dolomite, and a composite powder. Each raw material is sieved through a 1000-mesh sieve. The insulator glaze layer prepared by the method of the present invention exhibits excellent hydrophobicity and thermal stability, is resistant to surface contamination, and exhibits high resistance to pollution, reducing the risk of insulator breakdown during rainy weather. Furthermore, the high thermal stability enables the insulator to be used in areas with harsh climate conditions, broadening the application range of porcelain insulators.

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 relates to a preparation method of ceramic boron-phenolic composite resin, and aims to solve the problems of poor mechanical property, reduced heat resistance and the like of the existing phenolic resin material. The preparation method comprises the following steps: 1, dissolving boron phenolic resin in absolute ethyl alcohol under a heating condition; 2, adding a mixed filler into the resin solution under a water bath heating condition, wherein the mixed filler is prepared from calcined kaolin, aluminum oxide, low-melting-point glass powder, diboron trioxide and zirconium diboride; 3, carrying out pre-curing treatment; 4, performing vacuum curing treatment; and 5, final curing treatment. By screening and designing the ceramic forming agent components and determining the optimal ratio of the ceramic forming agent components, the mechanical property of the boron phenolic resin laminated board is remarkably enhanced, the heat resistance and the mechanical property are remarkably improved, the synergistic effect of the ceramic matrix and the ceramic forming agent is utilized, a filler system is constructed, and the service life of the boron phenolic resin laminated board is prolonged. And efficient ceramic conversion of the material in combustion and high-temperature extreme environments is ensured, so that the composite material is endowed with excellent ablation resistance and high-temperature stability.

The present invention provides a flame-retardant resin composition which is excellent in flame retardancy and heat resistance and is less likely to cause blooming. The present invention relates to a flame-retardant polypropylene resin composition characterized by comprising: (A) a polypropylene resin: 100 parts by weight; (B) a mixture of specific bisphenol S derivatives: 2 to 50 parts by weight; (C) at least one of (c1) tetrabromobisphenol A bis(2,3-dibromopropyl) ether and (c2) tris(2,3-dibromopropyl) isocyanurate: 0.2 to 20 parts by weight; and (D) at least one of antimony trioxide, antimony pentoxide, zinc molybdate, boron trioxide and zinc borate: 1 to 20 parts by weight.