546 results about "Antimony trioxide" patented technology

The invention belongs to the technical field of polyester recycling, and relates to a method for efficiently producing terephthalate by depolymerizing waste polyester through carbonic ester, which comprises the following steps: depolymerizing waste polyester, carbonic ester and a catalyst under the protection of nitrogen or inert gas and solvent-free conditions, a is more than one of zinc acetate, sodium acetate, potassium chloride, lithium chloride, potassium carbonate, sodium carbonate, ethylene glycol antimony, antimony trioxide, antimony acetate, ethylene glycol titanium and titanium dioxide, and B is sodium ethoxide. The method solves the problems of limited conversion of the waste polyester chemical recovery monomer and long production process in the prior art, obviously improves the catalytic efficiency and the depolymerization speed through the compound catalyst, simplifies the depolymerization process, reduces the energy consumption, and is beneficial to industrial application.

The invention relates to the field of flame retardants, and provides a sepiolite-based flame retardant and a preparation method thereof, the sepiolite-based flame retardant comprises the following raw materials by weight: 30-50 parts of antimony trioxide, 10-20 parts of modified sepiolite, 4-10 parts of a heat stabilizer, 10-20 parts of methyl silicone oil, and 0.5-4 parts of a dispersant. The sepiolite-based flame retardant provided by the invention has good flame retardance and smoke suppression performance, and has better commercial application value.

The invention provides a foamed rubber and plastic material without nitrosamine and a preparation method thereof, and relates to the technical field of foamed rubber and plastic materials. The foamed rubber-plastic material free of nitrosamine is prepared from nitrile rubber, polyvinyl chloride, chlorinated polyethylene, chlorinated paraffin, epoxidized soybean oil, aluminum hydroxide, a foaming agent, a foaming promoter, carbon black, an organic silicon modifier, antimony trioxide, solid paraffin, stearic acid, polyethylene glycol, sulfur, an anti-aging agent, a vulcanization accelerator and the like. The vulcanization accelerator provided by the invention is an accelerator ZBEC and an accelerator TBzTD. According to the invention, by adjusting the composition and proportion of the raw materials and combining the use of the composite vulcanization accelerator, the preparation of the foamed rubber and plastic material without nitrosamine is realized, and the environmental protection property and safety of the product are improved.

The invention discloses positive lead paste for a lead storage battery and a preparation method of the positive lead paste. The formula of the positive lead paste comprises lead powder, dilute sulphuric acid, water and an additive, and the additive comprises the following components in parts by mass: 2-6 parts of manganese dioxide / three-dimensional carbon-based composite electrode material, 1-2 parts of antimony trioxide, 1-2 parts of stannous mono-sulphate, 20-50 parts of red lead and 0.8-1.2 parts of polyester fiber. The manganese dioxide / three-dimensional carbon-based composite electrode material is adopted to replace conductive graphite and other conductive carbon materials, the conductivity is good, a stable three-dimensional structure is achieved, the active substance structure can be fixed during discharging, the positive active substance is effectively prevented from being softened, and the service life of the battery is prolonged; manganese dioxide has an oxidation catalysis function and can catalyze the efficiency of converting lead sulfate into lead dioxide, so that the charging capacity of the positive plate is greatly improved during charging, and side reactions are reduced; the composite electrode material has high specific capacitance, and the discharge capacity of a positive plate is improved during discharge.

The flame-retardant ABS composition is prepared from the following components in parts by weight: 70 to 80 parts of ABS resin; 16 to 20 parts of brominated flame retardant; 3-5 parts of an aluminum phosphate flame retardant; and 1-2 parts of a guanidine phosphate flame retardant. Through compounding of the brominated flame retardant, the aluminum phosphate flame retardant and the guanidine phosphate flame retardant, 1.5 mmV-0 flame retardance can be achieved on the premise that antimony trioxide is not added, and the flame retardant has the advantages of being high in melt fluidity, low in density and good in toughness and is suitable for preparing light-weight vehicle-mounted parts.

The invention discloses a sheath material for a saline-alkaline-resistant dragging cable, a preparation method of the sheath material, the cable and the sheath material. The sheath material is prepared from the following raw materials in parts by weight: 40 to 45 parts of chlorinated polyethylene, 1.5 to 2.0 parts of dicumyl peroxide vulcanizing agent, 2 to 2.5 parts of triisocyanate vulcanizing agent, 0.1 to 0.3 part of ethylene thiourea accelerant, 0.05 to 0.15 part of anti-aging agent RD, 4 to 5 parts of metal oxide, 1 to 1.5 parts of paraffin, 8 to 10 parts of calcium carbonate, 15 to 21 parts of reinforcing agent, 1 to 1.5 parts of lead stearate, 0.5 to 1 part of lead sulfate tribasic, 1 to 1.5 parts of ultraviolet light absorber, 3 to 5 parts of epoxidized soybean oil and 8 to 8 parts of chlorinated paraffin. 9 parts of antimony trioxide and 3-4 parts of antimony trioxide. The cable has the advantages of ultraviolet resistance, no salt deposition, water resistance, tensile resistance, cold resistance and the like, can be used for a long time in a special operating environment, has the service life of at least more than 3 years, and avoids frequent replacement of the cable by a user.

The invention belongs to the technical field of high polymer materials, and particularly relates to an antimony-free flame-retardant nylon material with high glowing filament temperature as well as a preparation method and application of the antimony-free flame-retardant nylon material. The invention relates to an antimony-free flame-retardant nylon material with high glowing filament temperature. The antimony-free flame-retardant nylon material is prepared from the following raw materials in percentage by weight: 70-74% of nylon 6 (PA6) resin, 16.5-18.5% of brominated flame retardant, 6-12% of phosphorus flame retardant, 0.5-1.5% of auxiliaries and 0.5-1% of black masterbatch. According to the invention, antimony trioxide is replaced by the phosphorus-based flame retardant, the phosphorus-based flame retardant and bromine are subjected to synergistic flame retardance, the flame retardance reaches UL94V0 (1.6 mm), a high glowing filament temperature GWIT850 DEG C can be obtained, and a glue opening of a black workpiece is not whitened.

The invention discloses an anti-corrosion fireproof coating applied to a new energy battery box and a preparation method, and relates to the technical field of industrial coatings, the anti-corrosion fireproof coating comprises the following specific components: a base resin system, a curing agent, a functional filler system, a flame retardant system, a solvent system and an auxiliary agent system; the anticorrosive and fireproof coating further comprises additives, wherein the additives specifically comprise a functionalized MXene loaded lithium ion adsorbent, a metal organic framework encapsulated quaternary phosphonium salt, polyaryletherketone coated antimony trioxide nano-particles and boron-nitrogen co-doped graphene aerogel powder; the material is prepared based on the materials. According to the invention, multiple additives are synergistically introduced into a traditional basic coating system, and on the basis of a basic flame-retardant and anti-corrosion structure, lithium ion directional adsorption, gas-phase free radical active intervention, high-temperature carbonization barrier construction and three-dimensional thermal barrier network configuration are further realized; therefore, the multi-dimensional safety performance of the coating in battery thermal runaway, salt spray corrosion and high-temperature impact environments is remarkably improved.

The invention relates to the technical field of piezoelectric light-transmitting functional ceramics, and discloses a high-light-transmitting ceramic material and a preparation method thereof.The preparation method comprises the following preparation steps that sodium carbonate, potassium carbonate, niobium pentoxide, antimony trioxide, samarium oxide and zirconium dioxide powder raw materials are taken, and after primary ball milling and drying are conducted on the powder raw materials, mixed powder is obtained; carrying out pre-sintering and secondary ball milling on the mixed powder, carrying out compression molding to form a tablet, and sintering and polishing the tablet to obtain a ceramic matrix; and spraying the composite slurry to the surface of a ceramic matrix, carrying out heat treatment, and cooling to room temperature to obtain the high-transmittance ceramic material. The antimony trioxide, the samarium oxide and the zirconium dioxide are co-doped, an antimony-samarium-zirconium liquid phase is generated in the ceramic material, pores of the ceramic material are filled and eliminated, and the prepared ceramic material has excellent optical transmittance, piezoelectric property and mechanical strength.

The invention discloses a PVC (polyvinyl chloride) film, a preparation method of the PVC film, flame-retardant and stable lamp-box fabric and a preparation method of the flame-retardant and stable lamp-box fabric. The lamp-box fabric comprises the following components in parts by mass: 70-100 parts of PVC powder, 25-60 parts of a plasticizer, 1-8 parts of a stabilizer, 30-150 parts of calcium powder, 5-10 parts of titanium dioxide and 5-30 parts of a flame retardant. The flame retardant is a mixture of antimony trioxide and a compound flame retardant containing silicon, zinc and boron elements. According to the PVC film, the preparation method of the PVC film, the flame-retardant and stable lamp box fabric and the preparation method of the flame-retardant and stable lamp box fabric, the thermal stability and the molten drop resistance of a product can be improved, and the preparation cost is reduced.

The invention relates to the technical field of high polymer materials, in particular to a light-aging-resistant flame-retardant ABS material for an electric fitting box and a preparation method of the light-aging-resistant flame-retardant ABS material. Comprising the following raw materials: ABS resin, AS resin, ABS high rubber powder, CPE, bromotriazine, carrier-free antimony trioxide master batch, a flame retardant synergist, precipitated barium sulphate, titanium dioxide, a main antioxidant, an auxiliary antioxidant, a lubricant, an anti-dripping agent, a dispersing agent and an ultraviolet absorbent. The material has excellent flame retardant property, and the synergistic effect of the flame retardant components such as the bromotriazine and the like reaches a high flame retardant grade; the ultraviolet absorbent and the titanium dioxide can delay aging and stabilize the color; the melt flow rate is high, and the fluidity is improved through cooperation of high-melt-index ABS and low-molecular-weight AS resin; the mechanical property is good, and the raw materials cooperate to guarantee strength and toughness; the appearance quality is good, pocking marks are avoided, and the glossiness is good. The preparation process is simple, and conventional equipment and reasonable parameters ensure stability and operability.

The invention discloses a phosphorus-tin-based flame retardant synergistic flame-retardant epoxy resin composition and a preparation method thereof, and belongs to the technical field of high polymer material modification and flame retardance. The preparation process of the flame-retardant epoxy resin composition comprises the following steps: respectively adding the phosphorus-based flame retardant, the tin-based flame retardant and the curing agent into the epoxy resin, uniformly mixing, pouring into a mold, and curing to obtain the flame-retardant epoxy resin composition. The phosphorus-based flame retardant and tin-based flame retardant synergistic flame-retardant epoxy resin composition has the advantages of good flame retardance, smoke suppression and thermal stability, low carbon, environmental protection and the like. The flame-retardant system overcomes the defect that toxic smoke and corrosive gas can be generated in the combustion process of traditional halogen-series flame retardants, antimony trioxide flame retardants and the like, and becomes one of environment-friendly flame retardants which reduce halogen and replace antimony trioxide.

The invention discloses a lead-sodium storage battery positive electrode lead paste in the technical field of storage batteries. The lead-sodium storage battery positive electrode lead paste comprises the following components in parts by weight: 100 parts of lead oxide powder, 6-10 parts of sulfuric acid, 14-24 parts of deionized water, 0.05-0.07 part of short fibers, 2-8 parts of lead dioxide, 1-2 parts of tetrabasic lead sulfate, 0.5-1.5 parts of calcium sulfate, 0.05-0.15 part of stannous sulfate, 0.05-0.15 part of antimony trioxide, 0.5-1 part of carbon black, 0.1-0.2 part of carboxymethyl cellulose sodium and 0.1-0.5 part of a mixed carbon material. By improving the design of the process, the formation efficiency and low-temperature performance of the storage battery can be effectively improved, and the service life of the storage battery can be effectively prolonged.

The invention discloses an environment-friendly high-toughness flame-retardant ABS (Acrylonitrile Butadiene Styrene) composition as well as a preparation method and application thereof. The environment-friendly high-toughness flame-retardant ABS composition is mainly prepared from the following raw materials in parts by weight: 2 to 3 parts of antimony trioxide, 3 to 6 parts of bromotriazine, 1 to 3 parts of hexabromocyclododecane, 1 to 2 parts of HP-AHB type flame retardant, 80 to 85 parts of ABS resin composition, 0.1 to 0.5 part of anti-dripping agent, 1 to 3 parts of zinc borate and 5 to 10 parts of nano calcium carbonate. The environment-friendly high-toughness flame-retardant ABS composition has the characteristics of high toughness, good flame-retardant effect and the like, and the composite material has the advantages, can be applied to the field of new energy automobiles, and has the advantages of low cost, high economic benefit and comprehensive popularization value.

The invention discloses a flame-retardant flat flexible high-current cable and a preparation method thereof, and relates to the technical field of cables. The cable comprises a flat conductor, an insulating layer, a shielding layer, a reinforcing layer and a sheath layer, the insulating layer contains 85-90 parts of low-density polyethylene, 1.2-1.5 parts of dicumyl peroxide, 12-15 parts of modified aluminum hydroxide and the like; and the sheath layer contains 42-50 parts of modified chlorinated polyethylene, 28-34 parts of modified aluminum hydroxide and the like. The modified chlorinated polyethylene is prepared through a three-step extrusion reaction, and the modified aluminum hydroxide is subjected to coupling agent treatment, coating modification and carbon nanotube composite modification. The flame-retardant flat flexible large-current cable has prominent advantages, an efficient flame-retardant system is constructed by modified aluminum hydroxide and antimony trioxide, and the V-0 level requirement of UL94 can be met; the flat structure is combined with the modified chlorinated polyethylene, so that the flexibility is excellent and the temperature-resistant range is wide. The design of the insulating layer and the shielding layer ensures excellent electrical performance, segmented temperature control and accurate parameter regulation and control are performed in preparation, stable product quality is ensured, and the device can adapt to a large-current application scene.

The calcining furnace comprises a machine table and a furnace body, a flue gas purification mechanism is installed at the top of the machine table, a top plate is installed at the top of the flue gas purification mechanism, an oxygen supply device and a smashing and stirring mechanism are arranged at the top of the top plate, a calcining rack is arranged at one end of the furnace body in a sealing fit mode, and the calcining rack is arranged at the other end of the furnace body. An L-shaped bracket is mounted at the bottom of one end of the machine table, and a flue gas purification mechanism is arranged in the machine table; through the smashing and stirring mechanism and the smashing type calcining structure of the calcining rack in the furnace body, materials needing to be calcined and processed are uniformly placed in the discharging groove to be processed, a material collecting structure of the discharging groove is conveniently utilized, unfolding and sealing are convenient, the processed materials are conveniently and uniformly collected and crushed, and the processing efficiency is improved. The limitation and inconvenience that materials are scattered and are difficult to take out are abandoned, rapid cooling and discharging are facilitated under the condition that the structure is actively pulled out from the interior of the furnace body, and the working efficiency of antimony trioxide processing and production is greatly improved.

This application relates to the field of metal surface treatment materials, specifically disclosing a silicon-integrated inorganic supercrystalline thermal energy powder and its preparation and application methods. The silicon-integrated inorganic supercrystalline thermal energy powder comprises raw material A and raw material B. Raw material A includes the following: magnesium oxide, sodium fluoroaluminate, sodium polyphosphate, zinc oxide, crystalline tin tetrachloride, silicon dioxide, and boric acid. Raw material B includes the following raw materials in parts by weight: spodumene, lithium carbonate, titanium dioxide, zinc silicate, sodium carbonate, antimony trioxide, albite, fluorite, boric acid, sodium hydroxide, and yttrium oxide. The inorganic supercrystalline thermal energy powder of this application has advantages such as corrosion resistance and oxidation resistance, good thermal stability, no damage from thermal cycling, high hardness, wear resistance and high temperature resistance, energy saving, water scale reduction, and the ability to replace organosilicon high-temperature resistant special coatings, baking paints, enamel paints, and ceramic floor glazes.

The invention relates to the field of high polymer materials, in particular to a PVC (polyvinyl chloride) modified resin composition, PVC modified resin as well as a preparation method and application thereof. According to the PVC modified resin provided by the invention, MBS and / or CPE are / is used as a flexibilizer of PVC, and the tensile elongation at break and impact strength of PVC are effectively improved by using an orthophthalic plasticizer, so that the defect of serious brittleness of PVC is overcome, and the PVC modified resin is suitable for various processing requirements; the surface resistance of the PVC modified resin is obviously reduced by combining conductive carbon black, and the flame retardant property is improved by combining antimony trioxide. The PVC modified resin provided by the invention is simple in blending modification preparation process and wide in application field as a PVC modified resin product, and various PVC series products, such as mine pipelines, plates or injection molding plastic parts, which can meet the requirements of different purposes can be obtained by regulating and controlling the formula.

The invention belongs to the technical field of PVC coated cloth, and particularly relates to environment-friendly welding-resistant low-cost coated cloth meeting the BS7837 standard. The coated fabric is a PVC coated fabric, and a PVC coated fabric coating taking WSFR-9702, antimony trioxide and decabromodiphenyl ethane as flame retardants is obtained through a large number of screening, so that the coated fabric simultaneously meets the comprehensive performance requirements of meeting the high flame retardance requirement of the BS7837 standard, meeting the high environmental protection requirement of the REACH regulation, being resistant to welding, low in cost, free of precipitation, folding white and the like; therefore, the method has the advantages of environmental protection, cost reduction and quality improvement, the comprehensive competitive advantage of the product is improved, and the method has great industrial application value.

The invention relates to a flame-retardant composition, a flame-retardant layer and a new energy automobile power battery comprising the flame-retardant layer. The flame-retardant composition comprises the following components in percentage by weight: 50-68% of matrix resin which is a mixture of polycarbonate and polyphenyl ether in a weight ratio of (1: 1)-(3: 1); the composite flame retardant comprises a phosphate flame retardant, a cyanamide flame retardant and an inorganic flame retardant according to the weight ratio of 1: (0.5-0.8): (2-2.5), and the inorganic flame retardant is selected from one or more of aluminum hydroxide, antimony trioxide, magnesium hydroxide and zinc borate; 10-20% by weight of a thermally conductive agent; 5 to 10 wt% of a silane coupling agent; and 1-3 wt% of a lubricant. A flame-retardant layer formed by the flame-retardant composition is arranged between a power battery module and an aluminum shell of the new energy automobile power battery, has good flame retardance, heat conduction and mechanical properties, and can meet the use requirements of the new energy automobile power battery.

A positive electrode lead paste for a high-capacity and long-service-life storage battery and a preparation method therefor. The formula of the positive electrode lead paste comprises lead powder, dilute sulfuric acid, water and additives. In parts by mass, the additives added to every 1000 parts of the lead powder comprise: 1-3 parts of sodium perborate; 0.5-2 parts of 4BS; 1-3 parts of antimony trioxide; 1-3 parts of tin pyrophosphate; 2-4 parts of a polyolefin; 2-4 parts of a conductive carbon material; and 1-1.5 parts of a polyester staple fiber. By adding tin pyrophosphate and the polyolefin in the positive electrode lead paste, the capacity of a lead storage battery can be effectively increased and the service life thereof can be prolonged; and tin pyrophosphate and the polyolefin can work synergistically, and the addition of the two together achieves a better effect.

The invention relates to the technical processing field of copper powder columns, in particular to a production process of an integrated supporting copper powder column and a VC vapor chamber, and the production process comprises the following steps that a mold is provided with a plurality of powder containing units, each powder containing unit is provided with a plurality of powder preparing grooves, and the adjacent powder preparing grooves are connected through a channel; the preparation method comprises the following steps: uniformly stirring copper powder, bismuth trioxide, antimony trioxide, silver, rosin resin, an adhesive, carbon nanotubes, a pore forming agent and water to obtain mixed powder; filling the mixed powder into a powder making groove and a channel; inserting the mixed powder into the center of the powder making tank filled with the mixed powder to obtain a pre-fired product; and preheating the pre-fired product in an environment with the temperature of 200-300 DEG C, preserving heat for 40-60 minutes at the temperature of 600-800 DEG C, preserving heat for 2-3 hours at the temperature of 1070-1100 DEG C, cooling to 20-30 DEG C, and demolding to obtain a finished product. Through the design of the powder containing unit of the mold, copper column inserting firing is matched after powder filling, an integrated supporting structure is formed, the overall stability of the supporting column is enhanced, different height requirements are met, collapse and falling are avoided, and the use stability of the vapor chamber is guaranteed.

A preparation method of 5N high-purity antimony comprises the following steps: (1) hydrolysis: taking ethylene glycol antimony as a raw material, and carrying out pyrohydrolysis pretreatment to obtain antimony trioxide; (2) biological reduction: uniformly mixing antimony trioxide with an organic catalytic reduction covering agent, and carrying out reduction smelting to prepare 4N antimony; and (3) vacuum distillation: the 4N antimony is subjected to two-stage vacuum distillation, namely first-stage high-temperature vacuum distillation and second-stage low-temperature vacuum distillation, and the 5N high-purity antimony is obtained. According to the method, an ethylene glycol antimony product is adopted as a raw material and subjected to hydrolysis-biological reduction and multi-field synergistic enhanced vacuum distillation to obtain 5N high-purity antimony, the total amount of impurity elements of the product is controlled to be 10 ppm or below, the content of key impurity elements As is controlled to be 1 ppm or below, the content of Pb is controlled to be 0.2 ppm or below, the content of Bi is controlled to be 0.2 ppm or below, the content of Cu is controlled to be 0.05 ppm or below, and the content of Fe is controlled to be 0.5 ppm or below.

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 discloses a flame-retardant polyolefin non-woven fabric as well as a preparation method and application thereof, and belongs to the technical field of polymer engineering plastics. The flame-retardant polyolefin non-woven fabric is prepared from, by mass, 60-85 parts of HDPE, 5-10 parts of TPEE, 5-15 parts of maleic anhydride grafted styrene, 2-6 parts of modified aluminum hydroxide, 6-16 parts of diethyl aluminum hypophosphite and 1-4 parts of antimonous oxide, the grafting rate of maleic anhydride grafted styrene is larger than or equal to 8%, the modified aluminum hydroxide is of a core-shell structure, a core layer is aluminum hydroxide, and a shell layer is aluminum hydroxide. The shell layer is cationic starch, and the average particle size of the modified aluminum hydroxide is greater than or equal to 0.5 mu m and less than or equal to 10 mu m. The flame-retardant polyolefin non-woven fabric prepared by the preparation method disclosed by the invention has excellent mechanical strength and good flame retardance. In addition, the preparation method of the flame-retardant polyolefin non-woven fabric provided by the invention is simple to operate and beneficial to actual production.

The invention relates to the field of sponge materials, and provides a flame-retardant sponge material as well as a preparation method and application thereof. The flame-retardant flame-retardant coating is prepared from the following components: phosphorus-based flame retardant modified oxidized feather-shaped carbon nanotubes, phosphorus-containing diol modified silicon dioxide aerogel, polyurethane, aluminum hydroxide, ammonium tripolyphosphate, toluene diisocyanate, deionized water, cyclopentane, triethanolamine, dibutyltin dilaurate, epoxidized soybean oil, talcum powder, an antioxidant, a light stabilizer, pigment and antimony trioxide. The composite material is prepared from expanded graphite, a silicone oil surfactant, an isothiazolinone antibacterial agent and a phosphorus-based flame retardant modified oxidized feather-shaped carbon nanotube through wet oxidation and dimethyl methylphosphonate modification, and phosphorus-containing diol is prepared from diethyl phosphite, diethanol amine and paraformaldehyde through condensation. The sponge disclosed by the invention has excellent mechanical and flame-retardant properties, and is widely applied to the fields of buildings, home furnishing and transportation.

The invention provides a synergistic flame retardant-reinforced integrated antimony trioxide substitute flame retardant and a preparation method thereof, and belongs to the technical field of flame retardants. The preparation method comprises the steps of preparing a nickel-iron compound, preparing functional composite powder and mixing. The step of preparing the nickel-iron compound comprises the following steps: heating deionized water to 60-65 DEG C, adding nickel nitrate and ferric nitrate, uniformly stirring, adding a cerium nitrate solution and citric acid, stirring for 30-35 minutes, adding ethylene glycol and a kH560 coupling agent solution, stirring for 1.5-2.0 hours, standing, aging, drying, keeping the temperature at 320-350 DEG C for 1.0-1.2 hours, and keeping the temperature at 620-630 DEG C for 3.5-4.0 hours to obtain the nickel-iron compound; the antimony trioxide substituted flame retardant disclosed by the invention can completely and equivalently replace antimony trioxide in the field, and is high in flame retardant property, mechanical property and stability.

The invention provides a PVC (polyvinyl chloride) plate for a refrigerator back plate, which is prepared from the following raw materials: 50 to 75 parts of PVC resin, 5 to 20 parts of chlorinated polyvinyl chloride, 5 to 15 parts of phosphorus-nitrogen flame retardant, 5 to 20 parts of inorganic flame retardant, 3 to 10 parts of mica powder, 3 to 10 parts of plasticizer, 0.2 to 3 parts of heat stabilizer, 0.2 to 3 parts of lubricant, 0.2 to 3 parts of coupling agent, 0.3 to 3 parts of nucleating agent, 0.5 to 1 part of antioxidant and 2 to 10 parts of processing aid. The phosphorus-nitrogen flame retardant is one or a combination of melamine polyphosphate, ammonium polyphosphate and phosphazene flame retardants; the inorganic flame retardant is one or a combination of aluminum hydroxide, magnesium hydroxide and antimony trioxide. The composition of the flame retardant in the PVC board is regulated and controlled, and the flame retardant property of the refrigerator back board can be greatly improved by compounding the phosphorus-nitrogen intumescent flame retardant and the inorganic flame retardant, so that the flame retardant property of the refrigerator back board reaches the 5VA grade and meets the industrial standard.

The invention discloses a highly flame-retardant and environmentally friendly modified PVC material without antimony trioxide and a preparation process thereof, and belongs to the technical field of modified PVC material preparation. The highly flame-retardant and environmentally friendly modified PVC material without antimony trioxide is composed of the following components in parts by weight: 40-60 parts of PVC, 2-8 parts of PVC modifier, 10-15 parts of microcapsule flame retardant, 2-8 parts of tetrahydrofuran, 0.5-2.1 parts of antioxidant, 2-4 parts of coupling agent, wherein the PVC modifier is prepared from diethylene glycol monovinyl ether, propylene acetate, azobisisobutyronitrile, ethyl acetate and methyl tert-butyl ether, and the microcapsule flame retardant is prepared from sodium hydroxide, choline chloride, phytic acid, corn starch, polyethylene glycol, toluene diisocyanate and pentaerythritol. PVC is modified using a PVC modifier, and a microcapsule flame retardant is added at the same time, and the prepared environmentally friendly modified PVC material has excellent flame retardant effect, rheology and toughness.

The invention relates to the technical field of power cables, and provides a flame-retardant power cable and a preparation method thereof. The flame-retardant power cable comprises a conductor, an insulating layer and a sheath layer which are sequentially arranged from inside to outside, and the sheath layer is prepared from, by weight, 40-60 parts of polyethylene, 60-80 parts of ethylene-vinyl acetate copolymer, 8-10 parts of compatilizer, 3-5 parts of auxiliaries, 15-20 parts of filler and 60-70 parts of flame retardant. The flame retardant is prepared from magnesium hydroxide, antimony trioxide, hydrated zinc borate and an aromatic bromine-containing compound in a mass ratio of 45: 8: 12: (25-30), and the number of bromine atoms of the aromatic bromine-containing compound is 6-8. According to the technical scheme, the problem of insufficient flame retardant property of the power cable in the prior art is solved.