38 results about "Antimony trioxide" patented technology

This invention discloses a flame-retardant PBT composite material, comprising the following components by weight: 40-73 parts PBT; 0.8-3.2 parts alkali lignin; 13-18 parts brominated flame retardant; 3-5 parts antimony trioxide; and 0.5-1 parts pentaerythritol. The weight-average molecular weight of the alkali lignin is 3000-10000. By selecting alkali lignin and pentaerythritol with specific molecular weights and using antimony trioxide as a laser color developer, this invention can effectively improve the laser marking defects of PBT composite materials modified with brominated flame retardants and has the advantage of thin-walled flame retardancy.

A kind of anti-spark ceramic and its body glaze, preparation method, use and ceramic tile, the body glaze is characterized in that, by mass fraction, its raw materials include: 3-12 parts of light calcium powder, 1-10 parts of magnesium oxide, 8-17 parts of dolomite powder, 6-12 parts of sodium sand, 6-12 parts of potassium sand, 0.5-6 parts of alumina and 10-25 parts of pottery clay, can also add tin dioxide, diantimony trioxide and zinc oxide as slurry conductive nanomaterial, can adjust both anti-spark property and anti-static property of ceramic to the best interval simultaneously.Anti-spark ceramic is provided with a body glaze layer prepared from the above-mentioned body glaze of anti-spark ceramic.The preparation method is used to prepare the above-mentioned anti-spark ceramic.The present application can solve the problem of friction impact sparking of other floor materials in the prior art, and also solve the problem that the anti-spark performance and anti-static performance of ceramic cannot be simultaneously achieved.

The application relates to the technical field of chemical protection materials, and discloses a hydrofluoric acid protective garment and a preparation method thereof. The material of the protective garment comprises a 5-layer structure, the middle layer is a framework fabric, and modified natural rubber layers and modified EPDM (ethylene propylene diene monomer) rubber layers are sequentially arranged on the two sides of the framework fabric. The raw materials of the modified natural rubber comprise, by weight parts, natural rubber 100 parts, sulfur 3-4 parts, accelerator M 1-2 parts, accelerator DM 1-2 parts, zinc oxide 4-6 parts, stearic acid 1-2 parts, white carbon black 10-15 parts, calcium oxide 20-40 parts, chlorinated paraffin 5-15 parts, antimony trioxide 5-15 parts and antioxidant 4010NA 1-2 parts. The modified natural rubber and the modified EPDM rubber are used as main protection substances, and organic solvents are used as carriers, so that the hydrofluoric acid protective garment not only has long-acting protection capability for hydrofluoric acid, but also has the characteristics of high mechanical strength, heat aging resistance, flame resistance and low-temperature softness.

The application discloses a high-temperature-resistant polyvinyl chloride adhesive tape and a preparation method thereof, and belongs to the technical field of polymer materials and adhesive products. The high-temperature-resistant polyvinyl chloride adhesive tape comprises the following raw materials in parts by weight: synergistically modified polyvinyl chloride, diphenyl phosphine oxide, chlorinated polyethylene, diisononyl phthalate, antimony trioxide, calcium stearate, zinc stearate, an antioxidant and a leveling agent; the synergistically modified polyvinyl chloride is obtained by introducing catechol structures on the surface of polyvinyl chloride through dopamine self-polymerization deposition, forming a dynamic borate ester structure with 3-aminobenzoic acid, and constructing a Si-O-Si network structure through hydrolytic condensation reaction of octa(3-aminopropyl)silsesquioxane and N-(beta-aminoethyl)-gamma-aminopropyl triethoxysilane. The dopamine-borate ester-silicone synergistic network structure is constructed, and the diphenyl phosphine oxide is introduced for function regulation, so that the heat resistance, mechanical properties and dimensional stability of the polyvinyl chloride adhesive tape are significantly improved.

The application provides a polyester fiber composite hot melt batting, a preparation method thereof and a quilt. The preparation method comprises the following steps: S1. mixing diacid, dihydric alcohol and antimony trioxide, and performing esterification reaction in a protective gas atmosphere, dehydration, adding trimethyl phosphate, and performing polycondensation reaction; the diacid comprises terephthalic acid, isophthalic acid and adipic acid, and the dihydric alcohol comprises diethylene glycol and ethylene glycol; the melt is extruded, cooled, and cut into pieces; the modified polyester piece is vacuum dried and then melt-spun and stretched; S2. the modified polyester fiber is made into a fiber web together with polyester fiber and cotton fiber; S3. three layers of the fiber web are stacked and hot-pressed, and the molten modified polyester fiber bonds the three layers of the fiber web together to form a batting. The batting is safe and environmentally friendly, and the problem of environmental pollution caused by the use of adhesive in the preparation process of the synthetic batting in the prior art is avoided.

The application belongs to the field of high polymer materials, and particularly relates to a modified polypropylene foaming material and a preparation method thereof. The modified polypropylene foaming material is prepared from a blank through mold foaming, and the preparation raw materials of the blank include, in parts by weight, 50-90 parts of homopolymer polypropylene, 10-40 parts of polystyrene, 1-10 parts of fluorine-containing functional monomer, 0.01-0.5 parts of initiator, 0.01-1 parts of catalyst, 0.1-0.5 parts of nucleating agent, 1-10 parts of decabromodiphenyl ethane, 0.2-5 parts of antimony trioxide and 0.05-5 parts of anti-dripping agent. The homopolymer polypropylene is modified by using multiple components in cooperation, so that the comprehensive performance of the material is significantly improved. The material has the advantages of strong stability, high Shore C hardness, large compressive strength, low dielectric constant, excellent anti-aging performance, good flame-retardant effect and wide application prospect in the field of new energy vehicles.

The present invention provides a water-based dispersion-type flame retardant that exhibits flame retardant effects equivalent to or better than those of both DBDPE and antimony trioxide, even when using small amounts or none of both compounds. [Solution] The present invention relates to an aqueous dispersion type flame retardant comprising a flame retardant component dispersed in an aqueous solvent, characterized in that (1) the flame retardant component comprises (1a) a metal salt of dialkylphosphinic acid and (1b) a brominated flame retardant component having a melting point of 150°C or less (excluding the metal salt), and (2) the ratio of the metal salt to the brominated flame retardant component is such that, with the total of both being 100% by weight, the ratio of metal salt:brominated flame retardant component = 90% by weight:10% by weight to 40% by weight:60% by weight.

This invention relates to the field of inorganic materials, specifically to a method for preparing low-lead antimony trioxide. The method involves crushing antimony ingots, first melting and oxidizing them, then distilling to remove impurities to obtain a refined product. The refined product, organic acid, and polyol are mixed, heated, and reacted, followed by filtration to remove insoluble matter, yielding an antimony complex solution. A long-chain organic amine is dissolved in a mixed solvent of anhydrous ethanol and deionized water to obtain a long-chain organic amine solution. The antimony complex solution is added to the long-chain organic amine solution, and the pH is adjusted to 6-7. The reaction solution is transferred to a hydrothermal reactor, sealed, and subjected to hydrothermal reaction. The precipitate is collected, washed, and dried. The resulting nanosheet-like clustered antimony trioxide exhibits high purity, low impurity content, extremely high specific surface area, abundant active sites, high energy density, and good cycle performance, making it a highly promising pseudocapacitor electrode material.

The application relates to the technical field of anti-radiation glass, and discloses anti-radiation glass for low-orbit spacecrafts, a preparation method and application thereof. The anti-radiation glass for low-orbit spacecrafts comprises the following raw materials in parts by mass: quartz sand 45.5-68 parts, aluminum hydroxide 8.41-10.25 parts, boric acid 8.86-24.62 parts, carbonate 24-43.69 parts, cerium dioxide 0.6-2.1 parts, gallium sesquioxide 0.2-1.2 parts, antimony sesquioxide 0.5-1 part, nitrate 2-4.6 parts, molybdenum dioxide 0.5-1.4 parts, lead oxide 0.8-2.2 parts, tetrabutyl titanate 3.4-12.75 parts, and kerosene 0.2-0.8 part. Through the technical scheme, the problem of insufficient anti-radiation performance of the glass for low-orbit spacecrafts in the related art is solved.

This invention discloses an ultra-soft PVC automotive artificial leather with excellent low-temperature toughness and flame retardancy without wire mesh support, and its preparation method, belonging to the field of PVC artificial leather technology. The invention consists of the following raw materials in parts by weight: 100 parts PVC resin powder, 40-50 parts phthalic plasticizer, 40-50 parts high-molecular polyester plasticizer, 15-25 parts antimony trioxide, 15-25 parts solid halogen-free flame retardant, 3-8 parts synergistic flame retardant, 3-8 parts heat stabilizer, and 1-2 parts lubricant. The leather prepared by this invention not only exhibits outstanding flame retardancy and low-temperature toughness, but also possesses good surface feel, abrasion resistance, and aging resistance, fully meeting the application requirements of high-end automotive interiors. The synergistic effect of antimony trioxide, solid halogen-free flame retardant, and synergistic flame retardant achieves a flame retardant effect greater than the sum of its parts (1+1+1>3), meeting the stringent requirement of a wire mesh-free support with a relatively low total addition amount.

This invention discloses a low-energy-consumption antimony trioxide continuous production system and process, relating to the field of silicon trioxide production. The system includes a calcining furnace with a cap on top. The low-energy-consumption antimony trioxide continuous production system also includes a mounting column, which is fixedly installed on the top surface of the cap. A drive motor is mounted on the top of the mounting column, and a connecting shaft is fixedly connected to the drive shaft of the drive motor. The invention uses the drive motor on the top of the cap to rotate the connecting shaft. Oxygen enters the connecting column through a ventilation slot and is discharged into the calcining furnace through an outlet, allowing the pulverized material to come into contact with oxygen. During the rotation of the connecting column, two gears (II) located on both sides of the bottom of the connecting column mesh with a gear (I) located at the bottom of the connecting rod, further agitating the pulverized material and ensuring sufficient contact between the material and oxygen. This ensures smooth processing of the material, guarantees production efficiency, and improves the practicality of the device.

The application provides an oil-resistant and low-temperature-resistant flame-retardant polyvinyl chloride elastomer plastic and a preparation method and application thereof, and the preparation raw material of the oil-resistant and low-temperature-resistant flame-retardant polyvinyl chloride elastomer plastic comprises the following components in parts by weight: polyvinyl chloride resin 50-70 parts, polyvinyl chloride grafted dioctyl sebacate 30-50 parts, flame retardant 23-38 parts, calcium-zinc stabilizer 6-8 parts, plasticizer 20-40 parts, lubricant 0.5-1 part; the flame retardant comprises antimony trioxide 5-8 parts, zinc borate 5-10 parts, silane coupling agent modified glass powder 5-8 parts and silane coupling agent modified wollastonite fiber 8-12 parts. The polyvinyl chloride elastomer plastic provided by the application can meet the requirements of low-temperature resistance, oil resistance and flame retardation at the same time by introducing polyvinyl chloride grafted dioctyl sebacate and a specific flame retardant system.

This utility model discloses a multi-layer conical cavity composite plywood, which, from top to bottom, consists of a surface layer, a flame-retardant layer, an upper microporous noise-reducing layer, an upper core layer, a middle layer, a lower core layer, a lower microporous noise-reducing layer, a moisture-proof layer, and a bottom layer. The surface layer is made of oak, the flame-retardant layer is made of antimony trioxide modified non-woven fabric, and the moisture-proof layer is made of aluminum foil. The upper and lower microporous noise-reducing layers have noise-reducing micropores, the upper and lower core layers have noise-reducing conical holes, the middle layer is embedded with rectangular melamine foam board, and the surface of the surface layer also has microgrooves. This plywood achieves multiple functions through a multi-layer structure. The various noise-reducing structures work together to reflect, refract, and absorb sounds of different frequencies multiple times, significantly reducing noise; the flame-retardant layer effectively improves fire resistance; and the aluminum foil moisture-proof layer can prevent moisture intrusion and extend service life. Its structural design is reasonable and can meet the needs of various places for flame retardancy, noise reduction, and moisture protection of the plywood.

This invention discloses a method for enhanced metal recovery of antimony slag based on oxygen-enriched volatilization technology, relating to the fields of non-ferrous metal smelting and solid waste resource utilization. The method comprises the following components: S1, antimony slag pretreatment; S2, side-blown melting reduction; S3, heating pretreatment; S4, oxygen-enriched volatilization enhancement; S5, valuable metal collection; and S6, recycling. This invention achieves efficient recovery, particularly for low-grade raw materials with antimony content below 5% in antimony-containing waste slag, through a combination of enhanced pretreatment and optimized process parameters. In the pretreatment stage, antimony slag is mixed with calcium oxide and roasted to convert low-valent antimony into easily volatile antimony trioxide. Simultaneously, process parameters are adjusted during the side-blown reduction and oxygen-enriched volatilization stages, such as increasing the oxygen concentration, furnace temperature, and gas residence time, significantly improving the volatilization and recovery efficiency of antimony in low-grade raw materials.

The present application relates to the technical field of waste heat recycling of crude antimony vacuum enrichment of antimony trioxide, and discloses a waste heat recycling device for crude antimony vacuum enrichment of antimony trioxide, which comprises a bottom plate, a vacuum high-temperature furnace is installed on the top of the bottom plate, and a cooling component is communicated with the surface of the vacuum high-temperature furnace; the cooling component comprises a transmission frame, which is communicated with the lower surface of the vacuum high-temperature furnace. The conical block pushes the through-hole scraper to clean the inner wall of the lower pipe when moving, so as to avoid the condensation of gaseous Sb2O3 in the gas in the lower pipe, which causes blockage and affects the utilization effect of the waste heat of crude antimony vacuum enrichment of antimony trioxide. The through-hole scraper pushes the condensed gaseous Sb2O3 into the inside of the cooling frame, which facilitates the centralized treatment of the condensed gaseous Sb2O3 through the sealing door. When the sealing block rotates with the upper screw rod, it moves in the upper pipe, and the sealing block is used to clean the inner wall of the upper pipe to avoid the condensation of gaseous Sb2O3 in the upper pipe, which causes blockage.

The patent discloses a preparation method of Mo-V-Sb-Na-O composite oxide catalyst and application of the Mo-V-Sb-Na-O composite oxide catalyst in a reaction of preparing acrylic acid from propylene aldehyde, and comprises the following steps: using a solvent evaporation method to prepare a Mo-V series catalyst, dissolving ammonium heptamolybdate, ammonium metavanadate and antimony trioxide in deionized water and uniformly mixing under rapid stirring, and drying and calcining the mixed liquid to obtain a high-activity catalyst for selectively oxidizing propylene aldehyde into acrylic acid, i.e. a composite oxide catalyst. The composite oxide catalyst prepared by the above method has the advantages of simple operation process, short preparation time, good selectivity and yield of acrylic acid.

A kind of high-lead antimony preparation antimony white production system, it includes: blowing furnace;Blowing furnace left side is equipped with pressure fan, pressure fan is connected with the blowing furnace by blowing pipe, blowing pipe is located in the hearth upper side of blowing furnace;Blowing furnace right side is equipped with air cooler for collecting antimony white containing smoke, one end of air cooler is connected with the top outlet of blowing furnace, other end is connected with dust collection device, dust collection device is equipped in the right side of air cooler;Dust collection device is connected with exhaust fan, exhaust fan is equipped in the rear of dust collection device, the outlet of exhaust fan is connected with water trap;Blowing furnace bottom discharge port below is equipped with ingot casting machine;Blowing furnace is electrically connected with temperature control device, temperature control device is arranged in the rear of blowing furnace.The production system provided by the utility model has good antimony white preparation effect, meets 99.5 antimony trioxide national standard, has low manufacturing cost and good economic benefit;The system is simple to operate, fast and efficient, and has short technological process, and can realize full-automatic control;No environmental pollution, low cost, less investment.

The application discloses a copper electrode zinc oxide varistor and a preparation method and application thereof, and relates to the technical field of varistor materials.The varistor disc preparation material is composed of zinc oxide, bismuth trioxide, nickel oxide, tricobalt tetroxide, manganese dioxide, boric acid, aluminum nitrate nonahydrate, antimony trioxide, yttrium oxide and chromium oxide, is subjected to ball milling mixing, granulation, compression molding, glue removal, sintering to obtain ceramic black sheets, and is subjected to copper electrode printing and burning and permeation in a nitrogen atmosphere to obtain a copper electrode varistor.The application effectively reduces the raw material cost under the premise of ensuring the quality of the grain boundary by replacing Sb2O3 with Y2O3, and simultaneously, the Cr 3+ The segregation at the grain boundary and the second phase precipitation form a grain boundary pinning effect, abnormal growth of ZnO grains is inhibited, and the grain size distribution is more concentrated.The application improves the nonlinear coefficient of the copper electrode varistor, reduces the leakage current and the residual voltage ratio, and the comprehensive electrical performance is excellent.

This invention relates to the field of flame-retardant materials, specifically to a composite functional material based on antimony trioxide and its preparation method, comprising: an antimony trioxide core; a MOF (Metal-Oxide-Factory) interlayer; and a phosphorus-containing organosilicon shell. This invention successfully prepares a novel composite functional material with stable structure and excellent performance by constructing a three-layer core-shell structure of "antimony trioxide core - MOF interlayer - phosphorus-containing organosilicon shell" and employing a stepwise preparation strategy of "thioglycolic acid surface modification - in-situ growth of MOFs - free radical polymerization grafting." This material exhibits excellent technical effects in terms of flame retardant performance, compatibility, and mechanical property retention, providing a new approach and technical method for the development of high-performance flame-retardant functional materials.

This invention provides an irradiated crosslinked, hydrolysis-resistant, low-halogen flame-retardant insulating material for energy storage cables and its preparation method, comprising the following raw material components in parts by weight: 43-51 parts of resin composition, 43-49 parts of flame-retardant composition, and 6.7-8 parts of auxiliary composition. The resin composition comprises the following components in parts by weight: 18-20 parts of ethylene-vinyl acetate copolymer; 10-12 parts of metallocene linear polyethylene; 7-9 parts of polyethylene elastomer; and 8-10 parts of POE graft compatibilizer. The flame-retardant composition comprises the following components in parts by weight: 12-14 parts of magnesium hydroxide; 21-23 parts of decabromodiphenyl ethane; and 10-12 parts of antimony trioxide. This results in a product exhibiting excellent mechanical properties, flame-retardant properties, hydrolysis resistance, long-term aging performance, and processing performance, with overall performance significantly superior to existing ordinary polyolefin insulating materials.

This invention relates to the field of cable technology and proposes a long-life overhead insulated cable. This long-life overhead insulated cable includes a conductor and an insulation layer. The insulation layer comprises the following raw materials in parts by weight: 80-100 parts high-density polyethylene, 10-20 parts polyolefin elastomer, 5-10 parts ethylene-vinyl acetate copolymer, 4-8 parts composite powder, 12-18 parts decabromodiphenyl ethane, 4-6 parts antimony trioxide, 0.5-1 part antioxidant, and 2.5-5 parts lubricant; wherein the composite powder is a core-shell structure inorganic particle with an organic ultraviolet absorber grafted onto the surface of ZnO@CeO2 core-shell particles. The long-life overhead insulated cable of this invention achieves the synergistic effect of inorganic ultraviolet shielding and organic ultraviolet absorption, significantly improving the cable insulation layer's resistance to ultraviolet aging, mechanical toughness, and weather resistance, effectively extending the service life of the overhead cable in complex outdoor environments.

The application discloses a PA66 composition and a preparation method and application thereof, and comprises the following components: 20-45 parts of PA66 resin, 8-20 parts of syndiotactic polystyrene, 10-50 parts of glass fiber, 2-8 parts of a compatilizer, 18-25 parts of brominated polystyrene, 5-8 parts of antimony trioxide and 0.1-2 parts of a crystallization regulator. By introducing the syndiotactic polystyrene (sPS) resin into the flame-retardant PA66 system, and by controlling the content of free bromine in the bromine flame retardant and the pH value of the crystallization regulator, the three synergistically act on the PA66 injection product of the bromine flame-retardant PA66, so that the wet-state electrical property of the product is greatly improved, meanwhile, the mechanical property of the system meets the basic requirements, the prepared PA66 composition has excellent wet-state electrical property and mechanical property, and has a good application prospect in the fields of electronic appliances, new energy and the like.

This invention relates to the field of plastic pipe technology, and proposes an extruded flame-retardant plastic pipe and its preparation method. An extruded flame-retardant plastic pipe comprises the following raw materials in parts by weight: 100 parts polypropylene, 10-15 parts ethylene-octene copolymer, 2-4 parts glass fiber, 8-10 parts flame retardant, and 3-5 parts additives. The flame retardant is composed of brominated styrene and antimony trioxide in a mass ratio of 3-4:1. The brominated styrene is composed of first brominated styrene and second brominated styrene, and the first and second brominated styrene have different weight-average molecular weights. This technical solution solves the problem of poor flame-retardant performance of plastic pipes in related technologies.

This invention discloses a wool production method for use in the cotton textile industry, comprising the following steps: A) Raw wool pretreatment; scouring: pre-washing, main washing, and rinsing are performed sequentially; B) Wool sliver preparation; wool oiling: spraying an oil-water agent containing 0.25% fiber cohesion enhancer; combing and finishing: after roughing, finishing removes short fibers <30mm in length; C) Mercerizing; chlorination modification; D) Wool / cotton blending; blending process: wool slivers and cotton slivers are laid up, combined and drafted using a blending machine; spinning: spinning: using a ring spinning machine; winding and twisting; E) Finishing; anti-pilling treatment: treatment with a mixture of 1.5–4% antimony trioxide phosphate and 0.1–0.2% protease. This method can reduce fiber damage and improve luster, fabric hand feel, and anti-pilling performance.

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.

The application discloses a kind of flame-retardant polyolefin nonwoven fabric and its preparation method and application, belong to polymer engineering plastics technical field.The flame-retardant polyolefin nonwoven fabric provided in the application includes the following components by mass fraction: HDPE 60~85 parts, TPEE 5~10 parts, maleic anhydride grafting styrene 5~15 parts, modified aluminum hydroxide 2~6 parts, aluminum diethyl hypophosphite 6~16 parts, antimony trioxide 1~4 parts, the grafting rate of maleic anhydride grafting styrene is greater than or equal to 8%, modified aluminum hydroxide is core-shell structure, core layer is aluminum hydroxide, shell layer is cationic starch, the average particle size of modified aluminum hydroxide is greater than or equal to 0.5 μm and less than or equal to 10 μm.The flame-retardant polyolefin nonwoven fabric prepared in the application has excellent mechanical strength and good flame retardancy.And, the preparation method of the flame-retardant polyolefin nonwoven fabric provided in the application is simple to operate, which is beneficial to actual production.

This invention discloses a polypropylene composition, its preparation method, and its application. The polypropylene composition comprises the following components by weight: 25-55 parts polypropylene, 15-30 parts brominated flame retardant, 3-10 parts antimony trioxide, 2-8 parts phosphorus-based flame retardant, 2-5 parts piperazine-based flame retardant, 1-3 parts mica, 10-30 parts glass fiber, and 2-4 parts compatibilizer; wherein the mica has a diameter-to-thickness ratio of (28-65):1. This invention, by adding phosphorus-based flame retardant, piperazine-based flame retardant, mica, and brominated flame retardant to a glass fiber reinforced polypropylene system, can effectively improve flame retardant properties and resistance to xenon lamp aging.

The application provides a polyester heat-shrinkable film for a slow-shrinking label and a preparation method thereof, and belongs to the technical field of polyester packaging materials. The preparation method of the heat-shrinkable film comprises the following steps: 1. polystyrene, a chain extender 3700 and PET are mixed and blended in a mixer to obtain a low-thermal-conductivity functional master batch; 2. terephthalic acid, ethylene glycol, 1,4-cyclohexane dimethanol and tetrabutyl titanate are subjected to esterification reaction under nitrogen protection, and then hydroxyl-terminated polyether and antimony trioxide are added to perform polycondensation reaction to obtain a heat buffer master batch; 3. PETG chips, the low-thermal-conductivity functional master batch, the heat buffer master batch, a compatible toughening agent, an opening agent and an antioxidant are melt-blended and extruded to obtain an unstretched cast sheet; and 4. the unstretched cast sheet is preheated, subjected to longitudinal stretching and heat setting, and then subjected to transverse stretching and heat setting to obtain the polyester heat-shrinkable film. The polyester heat-shrinkable film has low thermal conductivity, slow shrinkage speed, good flatness after shrinkage, and high strength and toughness.

A method for preparing 5N high-purity antimony includes the following steps: (1) using catalyst-grade Sb2O3 and polyester-grade ethylene glycol as raw materials, through high purification processes such as operation steps, filter material selection, process condition optimization, vacuum discharge, two primary filtrations and fine filtrations, and two crystallizations during the preparation of antimony glycolate, the obtained antimony glycolate meets the 5N standard; (2) mixing the 5N grade antimony glycolate with semiconductor-grade graphite powder as a supplementary reducing agent, and covering its surface with food-grade sodium carbonate, and reducing and melting under inert gas protection conditions to obtain 5N high-purity antimony with a total impurity content of <10ppm in one step. The process flow of this invention is simple, the process conditions are easy to control, the direct yield from antimony trioxide raw material to 5N high-purity antimony product is high, the cost is lower than other 5N high-purity antimony preparation processes, and it is more environmentally friendly.