2267 results about "Terephthalic acid" patented technology

One aspect is a method for producing a first intermediate product. A feedstock is provided that comprises a first polyester. The first polyester is contacted with a further organic compound in a volume section V3 to obtain a further initial mixture. A weight average molar mass of the first polyester is reduced in the volume section V3 to obtain a first intermediate mixture. The first intermediate mixture comprises a first intermediate product and the further organic compound. First particulated material is added to the first intermediate mixture in a volume section V4. A filtering means is pre-coated with the first particulated material. At least one impurity is at least partially removed from the first intermediate mixture using the filtering means. The first particulated material has a median pore diameter in the range of 5 mm to 20 mm.

One aspect is a method for producing a first intermediate product. A feedstock is provided that comprises a first polyester. The feedstock is contacted with a first amount of a first organic compound in a volume section V1 to obtain a first initial mixture. The first amount is in the form of a liquid. The first polyester is transported, and at least a fraction of the first amount of the first organic compound, from the volume section V1 to a volume section V2. The volume section V2 is at least partially filled with the first organic compound. A level of the first organic compound in the volume section V1 is at a height H1 from a floor, and a level of the first organic compound in the volume section V2 is at a height H2 from the floor. The first polyester is contacted with a further organic compound in a volume section V3, to obtain a further initial mixture. A weight average molar mass of the first polyester is reduced in the volume section V3, to obtain a first intermediate mixture. The first intermediate mixture comprisesa first intermediate product,the further organic compound.H1<H2.

One aspect is a method for producing a first intermediate product. A feedstock is provided that comprises a first polyester. The first polyester in the feedstock is in the form of a plurality of fragments. The feedstock is contacted with a first amount of a first organic compound in a volume section V1 to obtain a first initial mixture. The first amount is in the form of a liquid. The first polyester is contacted with a further organic compound in a volume section V3, to obtain a further initial mixture. A weight average molar mass of the first polyester is reduced in the volume section V3, to obtain a first intermediate mixture. The first intermediate mixture comprisesa first intermediate product andthe further organic compound.30 wt-% or less of the fragments, based on a total weight of the plurality of fragments in the feedstock, have a thickness that is equal to or larger than 1.0 mm.

One aspect is a method for producing a first intermediate product. A feedstock is provided that comprises a first polyester. The first polyester is contacted with a further organic compound in a volume section V3 to obtain a further initial mixture. A weight average molar mass of the first polyester is reduced in the volume section V3 to obtain a first intermediate mixture. The first intermediate mixture comprisesa first intermediate product and;the further organic compound.First particulated material is added to the first intermediate mixture in a volume section V4. A temperature of the first intermediate mixture in the volume section V4 is in the range of 160° C. to 230° C.

The invention discloses a photo-thermal aging resistant polyester composite material and a preparation method thereof, a modified monomer, a modified filler, benzophenone, terephthalic acid and neopentyl glycol are subjected to esterification condensation polymerization to prepare the composite material, and the modified monomer is added, so that the prepared polyester molecule is of a branched structure; the side chain of a polyester molecule and the surface of the modified filler both contain unsaturated double bonds which can react after being irradiated by ultraviolet light, so that the number of crosslinking points of the composite material is increased, the crosslinking density is further improved, and the anti-aging effect of the material is further improved; the modified filler can improve the high-temperature-resistant effect of the composite material, the modified filler is matched with the hindered phenol structure of the side chain to further improve the heat aging-resistant effect of the composite material, hydroxyl and ketone groups on the modified filler form intramolecular hydrogen bonds, light energy can be converted into heat energy to be released, and then the light aging-resistant effect of the composite material is improved.

One aspect is a method for producing a first intermediate product. A feedstock is provided that comprises a first polyester. The feedstock is contacted with a first amount of a first organic compound in a volume section V1 to obtain a first initial mixture. The first amount is in the form of a liquid. The first polyester is contacted with a further organic compound to obtain a further initial mixture. A weight average molar mass of the first polyester is reduced to obtain a first intermediate mixture. The first intermediate mixture has a first intermediate product, the further organic compound. A mass ratio of the feedstock to the first organic compound in the volume section V1 is in the range of 0.02 to 3.

The invention relates to a method for purifying a monomer bis (2-hydroxyethyl) terephthalate (BHET) obtained by depolymerizing waste polyester through ethylene glycol (EG), and belongs to the technical field of polyester recycling. The BHET microwave radiation induced film evaporation separation and molecular distillation refining continuous process provided by the invention solves the problems of long process flow, poor continuity, more side reactions and low purity and yield in the direct separation and refining process of BHET in alcoholysis liquid based on a gas-liquid equilibrium separation method at present. The whole technological parameter requirement is mild, the process is short, continuity is good, the BHET purity of the product is larger than or equal to 99.0 wt%, the hue is good, and the BHET yield is larger than or equal to 80.0%. And meanwhile, the method has the advantages that EG is conveniently recycled in a system, the production process is cleaner and more environment-friendly, and the comprehensive efficiency advantage is obvious.

The invention belongs to the technical field of recycled polyester, and particularly relates to a waste polyester textile recycling method which comprises the following steps: decolorizing colored waste polyester textiles by adopting a decolorizing agent which is more than one of dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate; the depolymerization agent is adopted to depolymerize the decolored polyester textile to obtain the terephthalate, and the depolymerization rate of the decolored polyester textile is 98.0-100%; firstly, terephthalate is converted into DMT, and then DMT, ethylene glycol, a catalyst and a functional additive are subjected to a repolymerization reaction to obtain regenerated PET. According to the method, a process of decoloring and depolymerizing sequentially is adopted, and decoloring and depolymerizing are coordinated, so that the process is simplified, the energy consumption and pollution are reduced, and the economical efficiency and sustainability of waste polyester textile recycling are improved.

The invention relates to a biodegradable composition as well as a preparation method and application thereof, and belongs to the technical field of compositions of high-molecular compounds. The biodegradable composition disclosed by the invention is prepared from the following components in parts by weight: 44 to 90 parts of PBAT resin, 5 to 15 parts of amorphous resin and 5 to 40 parts of inorganic filler, based on the total molar weight of a terephthalic acid monomer unit and an adipic acid monomer unit in the PBAT resin, the molar ratio of the terephthalic acid monomer unit is 47-49%; the amorphous resin is at least one of PPC-P, PMMA (Polymethyl Methacrylate), PETG (Polyethylene Terephthalate Glycol) and PCTG; the inorganic filler comprises at least one of calcium carbonate and talcum powder; the particle size D50 of the calcium carbonate is less than 5 [mu] m, and / or the particle size D50 of the talcum powder is less than 8 [mu] m. The biodegradable film produced by adopting the biodegradable composition under a low blow-up ratio process has excellent dart falling performance, and can meet the requirement of ultra-long shelf life.

The preparation method of the antibacterial polyester fiber comprises the following steps: firstly, reacting a cationic antibacterial agent with a terminal carboxyl group with 4-sulfobenzoic acid monopotassium salt to obtain a high-temperature-resistant polymerizable cationic antibacterial agent; then taking purified terephthalic acid, a high-temperature-resistant polymerizable cationic antibacterial agent and ethylene glycol as raw materials, adding an auxiliary agent trimethyl phosphate and a catalyst to prepare uniform slurry, and adding the uniform slurry into an esterification reaction kettle; entering a polycondensation stage after esterification is finished, filling nitrogen after reaction is finished, pressurizing, discharging, and performing underwater granulation to obtain antibacterial polyester chips; then, the antibacterial polyester chips are dried until the water content is lower than 30 ppm, and the antibacterial polyester fibers are obtained through the melt extrusion spinning step; the fiber strength of the prepared antibacterial polyester fiber is larger than or equal to 2.8 cN / dtex, the antibacterial rate meets the AAA grade standard, and the antibacterial polyester fiber has good strength and is wide in application range.

The invention discloses a warm-keeping fabric containing hollow polyester fibers as well as a preparation method and application thereof, and relates to the field of fabrics. When the thermal fabric containing the hollow polyester fibers is prepared, hollow mesoporous nano cerium oxide is selectively protected by molten paraffin and then reacts with chloromethyl trimethoxy silane and isocyanuric acid in sequence, paraffin is dissolved by chloroform, and then N-(3-trimethoxysilylpropyl) pyrrole is grafted to obtain modified hollow mesoporous nano cerium oxide; reacting terephthalic acid, a multifunctional monomer and ethylene glycol to obtain modified polyester particles; the preparation method comprises the following steps: granulating modified polyester, uniformly mixing modified hollow mesoporous nano cerium oxide and polyethylene glycol 10000, performing melt spinning, treating with a pyrrole solution, twisting, spinning and weaving, and treating with a sodium hypochlorite mixed solution to obtain the thermal fabric containing the hollow polyester fibers. The warm-keeping fabric containing the hollow polyester fibers prepared by the invention has excellent warm-keeping, antibacterial, anti-aging, flame-retardant, antistatic and mechanical properties.

The invention belongs to the technical field of new materials of conveying belts, and discloses a graphene modified whole-core flame-retardant conveying belt for a coal mine and a preparation method of the graphene modified whole-core flame-retardant conveying belt. Comprising mixed rubber and a polyester fabric located in mixed liquid, and the mixed rubber is prepared from, by weight, 100-120 parts of chloroprene rubber, 20-30 parts of hydrogenated nitrile rubber, 5-10 parts of graphene composite particles, 1-3 parts of magnesium hydroxide and 1-3 parts of dioctyl terephthalate. The conveyor belt prepared by the invention not only has relatively high mechanical strength and tear resistance, but also has good flame retardant property.

The invention belongs to the technical field of regenerated polyester, and particularly relates to a waste cotton-polyester blended fabric recycling method which comprises the following steps: firstly, decolorizing a colored waste cotton-polyester blended fabric by adopting a decolorizing agent, then mixing a depolymerizing agent, isosorbide dimethyl ether, a first catalyst and the decolorized cotton-polyester blended fabric, and then carrying out depolymerization reaction, the decolorizing agent and the depolymerizing agent are more than one of dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate, and the temperature of the depolymerizing reaction is 130-150 DEG C; washing the separated cotton fibers with water, and screening to remove residual polyester powder on the surfaces; firstly, terephthalate is converted into DMT, and then DMT, ethylene glycol, a second catalyst and a functional additive are subjected to a repolymerization reaction to obtain regenerated polyethylene glycol terephthalate. According to the method, depolymerization and polyester cotton separation processes are ingeniously fused, so that the operation steps are simplified, the energy consumption is reduced, and the purity of a depolymerization product is also improved.

The invention relates to the field of polyester materials, and particularly discloses modified polyester with low yellowness value and high glass transition temperature characteristics and a preparation method thereof, and the modified polyester is prepared by taking terephthalic acid, diphenyldicarboxylic acid and fluorenyl aromatic dicarboxylic acid as carboxylic acid monomers, respectively esterifying with ethylene glycol, and carrying out co-polycondensation on corresponding esterification products. According to the present invention, the biphenyldicarboxylic acid with the conjugated aromatic ring structure and the fluorenyl aromatic dicarboxylic acid monomer are selectively introduced to modify the PET, such that the regularity of the polyester chain segment is broken so as to ensure the optical performance of the polyester; the movement of a polyester chain segment is limited so as to improve the Tg value of polyester; and by matching with a novel preparation method, the yellowness value of the polyester material is reduced.

The invention discloses preparation of a bionic copper-based MOF nano-enzyme and application of the bionic copper-based MOF nano-enzyme in hydroquinone detection, and the bionic copper-based MOF nano-enzyme is prepared by the following method: dissolving terephthalic acid H2BDC and L-histidine His in N, N-dimethylformamide DMF to obtain a solution A; adding copper chloride CuCl2. 2H2O into the solution A obtained by C1, and stirring to form a uniform mixed solution; carrying out hydrothermal reaction on the mixed solution obtained from C2 for a certain time, centrifuging to obtain a solid precipitate, cleaning the solid precipitate, and drying to obtain the bionic Cu / His-MOF nano-enzyme; the invention also discloses an application of the sensor in hydroquinone detection. The bionic copper-based MOF nano-enzyme has the advantages of being simple and convenient to synthesize, high in substrate affinity, high in catalytic capacity and the like, and meanwhile, a rapid, sensitive and reliable HQ detection method is provided.

The invention relates to the field of plastic bags, and discloses a biodegradable plastic bag and a preparation method thereof, the biodegradable plastic bag comprises polylactic acid, poly (butylene adipate-co-terephthalate), a functional additive, modified starch, a lubricant and an antioxidant; the functional additive is prepared by grafting hydroxylated modified castor oil and isocyanated montmorillonite loaded titanium dioxide; the hydroxylation modified castor oil is prepared by modifying castor oil with chloroethyl isocyanate, then reacting with N-allylimidazole, and then reacting with 6-mercaptohexyl-1-alcohol; the isocyanated montmorillonite loaded titanium dioxide is prepared by reacting montmorillonite loaded titanium dioxide obtained by a sol-gel method with isophorone diisocyanate; the modified starch is prepared by reacting octadecanoyl chloride and acryloyl chloride with starch, then carrying out graft copolymerization with ethyl acrylate and further introducing glycidyl methacrylate, so that the plastic bag is endowed with excellent mechanical properties, biodegradability and antibacterial property.

The invention relates to the technical field of rubber compounds, and particularly discloses a bio-based and circulating material synergistically modified EPDM rubber compound and a preparation method thereof. The invention discloses a bio-based and circulating material synergistically modified EPDM rubber compound. The rubber compound is prepared from the following components: 100 parts of bio-based EPDM rubber, 100 to 130 parts of a reinforcing agent, 40 to 60 parts of paraffin oil, 5 to 7 parts of magnesium oxide, 0.5 to 1.5 parts of stearic acid, 6 to 8 parts of BIPB-40 peroxide, 2 to 5 parts of a Si-69 silane coupling agent, 1 to 3 parts of a dispersing agent and 1 to 3 parts of an assistant crosslinking agent, the reinforcing agent is composed of fast extruding furnace black N550, rice hull ash white carbon black and thermal cracking carbon black; and the assistant cross-linking agent is prepared from diallyl terephthalate and triallyl isocyanurate. The rubber compound prepared by utilizing the technical scheme provided by the invention can meet and maintain the mechanical property requirements, and meanwhile, carbon emission of the product in the whole life cycle is reduced from the aspects of formula and process.

The invention belongs to the technical field of regenerated polyester, and particularly relates to a waste polyester-spandex blended fabric recovery method, which comprises the following steps: carrying out decoloration and depolymerization on a colored waste polyester-spandex blended fabric by using a treating agent; and depolymerizing the decolored polyester fabric by using a depolymerizing agent to obtain the terephthalate. Wherein the treating agent is more than one of dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate; the depolymerizing agent is the same as the treating agent; the depolymerization rate of spandex in the waste polyester-spandex blended fabric is 98-100%, and the decolorization rate of the waste polyester-spandex blended fabric calculated according to the K / S value is 98% or above. The method breaks through the bottlenecks of high pollution and high energy consumption of the traditional process, and solves the contradiction that component separation and decoloration are difficult to take into account in the recovery process of the blended fabric.

The invention relates to the technical field of recycling and reusing of solar back plates of photovoltaic modules, and discloses a recycling method of a solar back plate. The recovery method of the solar back panel is characterized by comprising the following steps: (1) in the presence of a protective gas and a catalyst, carrying out alcoholysis reaction on the solar back panel and alcohol to obtain a depolymerized mixed solution; and (2) carrying out purification treatment on the depolymerized mixed solution obtained in the step (1) to obtain bis (2-hydroxyethyl) terephthalate (BHET), polyvinylidene fluoride and polyolefin. According to the method, the PET middle layer in the solar panel can be completely depolymerized into the BHET monomer, the yield is greater than or equal to 78%, and the purity is greater than or equal to 98%; pVDF and PP (or PE) products can be respectively obtained after the PVDF and PP (or PE) materials which do not participate in depolymerization are separated and purified; the whole chemical recovery process is simple in operation method and high in efficiency, and has good economic benefits.

The preparation method comprises the following steps: 1, completing an esterification reaction of terephthalic acid and ethylene glycol in an esterification reaction kettle according to a semi-continuous polyester synthesis process, and ensuring that the esterification rate is not lower than 96% by controlling the water yield; 2, introducing the fully esterified intermediate high-temperature solution into a secondary esterification kettle, uniformly adding quantitative self-prepared spherical coated silicon dioxide additive suspension, controlling the temperature, and continuously stirring and dispersing for not less than 30 minutes; and 3, heating the uniform slurry in the secondary esterification reaction kettle to a certain temperature, introducing the slurry into a polycondensation reaction kettle after passing through a melt filter of 15-25 microns, completing a polymerization reaction in the polycondensation reaction kettle by controlling parameters such as temperature, pressure and stirring rate, and synthesizing a polyester chip melt capable of producing the low-scratch release protective film, and pelletizing the polyester chips by using an underwater pelletizing system, drying and sub-packaging to obtain the target modified polyester chips.

A high-strength PA6 composite material and a preparation method therefor, the PA6 composite material comprising, in parts by mass, 80-95 parts of caprolactam, 1-3 parts of benzoic acid and 10-30 parts of a modification additive. The benzoic acid is used for improving the tensile strength of the composite material, and the modification additive is used for enhancing the impact resistance of the composite material. Terephthalic acid and m-xylylenediamine undergo a reaction to generate m-xylylenediamine terephthalate, which is then subjected to a polycondensation reaction with caprolactam, so as to introduce same into the backbone of a PA6 molecule and modify the PA6 resin. The modified PA6 resin has remarkably improved tensile strength and impact resistance, so that the application range of the PA6 composite material can be greatly expanded.

The invention relates to a preparation method of a terephthalic acid and 2-methylimidazole organic framework catalyst, and relates to a preparation method of a high polymer material catalyst, the preparation method comprises the following steps: weighing C6H4 (COOH) 2 and 2-methylimidazole, dissolving C6H4 (COOH) 2 and C4H6N2 in N, N-dimethylformamide (DMF), weighing zinc nitrate hexahydrate (Zn (NO3) 2.6 H2O), dissolving in DMF, and preparing into a solution; the preparation method comprises the following steps: mixing a C6H4 (COOH) 2 solution and a C4H6N2 solution in proportion, and uniformly stirring; slowly adding the mixed ligand solution into a mixed solution of zinc nitrate hexahydrate (Zn (NO). 6HO) dissolved in DMF (Dimethyl Formamide), and transferring into a high-pressure reaction kettle for reaction; after cooling, centrifugally separating to obtain a white solid product, washing with methanol, and drying to obtain the Zn-MOF catalyst. The Zn-MOF catalyst provided by the invention can be widely applied to polyester synthesis, esterification reaction and other organic catalytic reactions, and especially has significant advantages in PBAT synthesis.

The invention discloses a novel polyester intermediate product as well as a preparation method and application thereof, and the novel polyester intermediate product is O, O '-(ethane-1, 2-diacyl) bis (2-hydroxyethyl) diterephthalate (BHET-MHET). Experiments prove that BHET-MHET is taken as a substrate and can be widely applied to activity detection and screening of polyester depolymerases by detecting OD600nm. The polyester degrading enzyme can be a polyester depolymerases LCC, a polyester depolymerases TfCut2 or a polyester depolymerases PETase. The method for screening the polyester depolymerases by using BHET-MHET has the characteristics of high accuracy and high reliability. The method has an important application value.

The invention belongs to the technical field of functional materials, and provides MOF-5 and preparation and application thereof, and a polymer self-lubricating composite material and preparation and application thereof. The preparation method comprises the following steps: mixing zinc salt, terephthalic acid, an end-capping reagent (polyvinyl pyrrolidone or polyvinyl alcohol), a weak base (triethylamine or sodium acetate) and a solvent, and carrying out ultrasonic treatment. The end-capping reagent and the weak base are added, so that the microstructure of the MOF-5 is lamellar, and the specificity of the crystal face is exposed, and when the MOF-5 is used as a functional filler to be applied to the self-lubricating polymer, the tribological performance can be improved. The MOF-5 mainly provides a reinforcing effect similar to that of crushed carbon fibers, and in the frictional wear process of the polymer self-lubricating composite material and a metal pair, the MOF-5 mainly serves as a bearing phase to bear main loads and makes contact with the metal pair to form a uniform and continuous transfer film on the surface of the metal pair, so that the metal pair is protected against abrasion. The tribological property of the polymer self-lubricating composite material is improved.

The invention discloses a bimetal MOFs-loaded electrostatic spinning fiber membrane for oil-water separation and a preparation method thereof, and belongs to the technical field of membrane separation, and the preparation method comprises the following steps: (1) preparing a hydroxyl-modified metal organic framework material MIL-53 (Al)-OH through a solvothermal reaction; (2) preparing an MIL-53 (Fe) precursor solution by using ferric salt, terephthalic acid, polyvinylpyrrolidone and an organic solvent, ultrasonically dispersing MIL-53 (Al)-OH in the MIL-53 (Fe) precursor solution, uniformly mixing, and soaking the electrostatic spinning fiber membrane in the MIL-53 (Fe) precursor solution for 1-3 hours; and (3) transferring the system in the step (2) into a reaction kettle, reacting at 130-150 DEG C for 10-15 hours to enable the bimetallic MOFs to grow on the surface of the electrostatic spinning fiber membrane, washing, and drying to obtain the bimetallic MOFs-loaded electrostatic spinning fiber membrane for oil-water separation. The bimetal MOFs-loaded electrostatic spinning fiber membrane has the advantages of good oil-water separation performance, strong antifouling ability and strong dye degradation ability.

The present invention relates to the technical field of coatings and discloses a method for preparing an EVA waterproof coating. Activated montmorillonite reacts with toluene diisocyanate to obtain isocyanate-modified montmorillonite. EVA is hydrolyzed under the catalysis of potassium hydroxide to obtain hydroxylated EVA. An epoxy trisiloxane intermediate reacts with terephthalic acid under ring-opening esterification with benzyltriethylammonium chloride to obtain p-hydroxytrisiloxane benzoate. P-hydroxytrisiloxane benzoate, hydroxylated EVA, and isocyanate-modified montmorillonite are cross-linked with toluene diisocyanate under the catalysis of stannous octoate, and a defoamer and a dispersant are added thereto and stirred uniformly to obtain an EVA waterproof coating. The EVA waterproof coating prepared by the present invention has good mechanical properties and waterproof properties.

The invention relates to the technical field of high-performance polyester fibers, and discloses a dry skin-friendly fiber fabric, a preparation method thereof and application of the dry skin-friendly fiber fabric in underwear. The preparation method of the dry and comfortable skin-friendly fiber fabric comprises the following steps: carrying out reaction on terephthalic acid, ethylene glycol and an antibacterial modified diamide diol monomer to obtain modified polyester; the modified polyester and the polyester master batch are mixed and spun, and the modified profiled polyester fiber is obtained; dipping the modified profiled polyester fiber in a finishing liquid containing a biopolymer finishing agent to obtain the high-performance polyester fiber, blending and knitting high-performance polyester fibers, cotton fibers and mulberry silk fibers to obtain a dry skin-friendly fiber fabric; the dry and comfortable skin-friendly fiber fabric has excellent antibacterial performance, moisture absorption performance and skin-friendly performance, the skin can be kept dry and comfortable, safe and comfortable wearing experience is provided for a wearer, and the dry and comfortable skin-friendly fiber fabric can be used for underwear and other underwear materials.

The invention relates to the technical field of organic polymers, and discloses a special copolyester for a high-speed stretch film and a preparation method thereof.The special copolyester is prepared from, by mass, 50-60 parts of terephthalic acid, 20-30 parts of ethylene glycol, 5-20 parts of a polymerizable eutectic solvent, 0.02-0.03 part of a catalyst and 0.002-0.003 part of a stabilizer; the copolyester is prepared by polymerizing terephthalic acid, ethylene glycol, the polymerizable eutectic solvent, the catalyst and the stabilizer, and the polymerizable eutectic solvent has relatively high conductivity after polymerization, so that the melt resistivity of the polyester can be improved, and the toughness and transparency of the polyester can be improved; the problems of polyester crystallization and yellowing caused by electrostatic agents such as metal compounds can be avoided; the copolyester is low in melt resistivity, simple and feasible in preparation method and suitable for high-speed film drawing production.

The invention discloses an antistatic polyester fiber and a preparation method thereof, and relates to the field of fibers. When the antistatic polyester fiber is prepared, N, N-dimethylethanolamine reacts with allyl chloride, and then dichloro phthalocyanine silicon is grafted to obtain modified silicon phthalocyanine; polymerizing terephthalic acid, itaconic acid and ethylene glycol, and reacting with fluorescein isothiocyanate and modified silicon phthalocyanine in sequence to obtain modified polyester chips; the preparation method comprises the following steps: reacting phosphonitrilic chloride trimer with 3-hydroxy-5-nitropyridazine, and reducing to obtain a flame retardant; and carrying out melt spinning on the modified polyester chips and a flame retardant, and reacting to obtain the antistatic polyester fiber. The antistatic polyester fiber prepared by the invention has excellent antistatic property, antibacterial property, flame retardance and mechanical property.

The purpose of the present invention is to provide: a low-shrinkage fiber; a method for producing the low-shrinkage fiber; an air-blended yarn comprising the polytrimethylene terephthalate fiber; and a fabric comprising the air-blended yarn. The low-shrinkage fiber is substantially composed of polytrimethylene terephthalate, and can be used to produce a precursor for a fabric, which has a soft texture and a low shrinkage rate due to heat. The present invention is characterized in that 90 mol% or more of polytrimethylene terephthalate fibers are composed of trimethylene terephthalate repeating units, the boiling water shrinkage of the polytrimethylene terephthalate fibers is 5% or less, and the elastic modulus of the polytrimethylene terephthalate fibers at an elongation of 20% is 5 cN / dtex or less.