628 results about "Polybutylene terephthalate" patented technology

The invention relates to the technical field of PBT materials, and discloses a novel environment-friendly flame-retardant reinforced high glowing filament PBT material. The raw materials comprise the following components in percentage by weight: 23-44.8% of PBT resin, 0-15% of PET resin, 2-10% of a flexibilizer, 8-12% of a brominated flame retardant, 1.5-3% of a synergistic flame retardant, 6-11% of melamine cyanurate, 2-6% of a phosphorus environment-friendly flame retardant, 0.3-3% of a glowing filament synergist, 0.2-1% of an antioxidant, 0.2-1% of a lubricant and 15-35% of glass fibers. According to the novel environment-friendly flame-retardant reinforced high glowing filament PBT material and the preparation method thereof, the PBT material is high in mechanical property and good in fireproof performance, can meet the market requirement that glowing filaments at 750 DEG C and higher grade at 850 DEG C are not ignited in the whole process, meets the latest environment-friendly control requirement on the market, and is wide in market application prospect.

The invention discloses a high dimensional stability glass fiber reinforced halogen-free flame retardant PBT / PC alloy material, and relates to the technical field of PBT / PC alloy preparation, the raw materials comprise the following components by mass: 35-60 parts of PBT, 30-40 parts of PC, 2-10 parts of a modified heat resistant agent, 1-15 parts of an antioxidant, 0.1-6 parts of a heat stabilizer, 0.2-3 parts of a lubricant, 0.2-3 parts of a halogen-free flame retardant, 2-6 parts of mica, and 5-40 parts of glass fiber. The glass fiber reinforced PBT / PC alloy material is processed and prepared according to a set proportion and a set preparation sequence, the PBT / PC material with high dimensional stability is finally obtained, diisocyanate, hydroxyalkyl terminated polydimethylsiloxane and a hexaalkoxy silane coupling agent are compounded according to a certain proportion to prepare a modified heat-resistant agent, and the modified heat-resistant agent is added into the glass fiber reinforced PBT / PC alloy material to prepare the glass fiber reinforced PBT / PC alloy material. According to the PBT / PC alloy material disclosed by the invention, the overall heat resistance of the PBT / PC alloy material is improved while the interfacial compatibility among different materials is improved, and the prepared PBT / PC alloy material has better dimensional stability at different temperatures due to the proportion of PBT and PC and is not easy to change in size.

The invention belongs to the technical field of high polymer materials, and particularly relates to a high-strength papermaking forming net fiber. Comprising the following raw materials in parts by weight: 75-90 parts of polyethylene glycol terephthalate, 5-15 parts of polybutylene terephthalate, 3-10 parts of a modified fiber filler, 2-5 parts of modified graphene, 2-8 parts of silicon dioxide, 0.5-2 parts of a silane coupling agent KH-560, 1-3 parts of an anti-hydrolysis agent, 0.5-1.5 parts of an antioxidant and 0.3-1 part of a lubricant. Wherein the modified fiber filler is prepared by sequentially carrying out modification processes such as silane coupling agent, citric acid-glycerol esterification, iron bismuth oxide loading and the like on glass fibers; the modified graphene is prepared by introducing dopamine, cerium ions and glycidyl methacrylate for modification. The mechanical strength, the hydrolysis resistance and the wear resistance of the fiber are remarkably improved through the synergistic effect of all the components and the melt spinning-multi-stage stretching process, and the fiber is particularly suitable for a forming net of a high-speed paper machine.

Provided is an exterior material for a power storage device which excels in formability and heat resistance.　The exterior material for a power storage device is composed of a multilayer body that comprises a base material layer, a barrier layer, and a heat-fusible resin layer, in that order. The base material layer is a polyester film containing polyethylene terephthalate and polybutylene terephthalate at a mass ratio of 65 / 35 to 90 / 10. The tensile elongation at break of the polyester film in the width direction is 90 to 155%.

The invention provides a polybutylene terephthalate resin composition as well as a preparation method and application thereof. The polybutylene terephthalate resin composition is prepared from the following components in parts by weight: 45 to 56 parts by weight of polybutylene terephthalate, 10 to 16 parts by weight of halogen-free flame retardant, 2 to 6 parts by weight of halogen-free synergist, 25 to 35 parts by weight of glass fiber, 0.4 to 1.5 parts by weight of stabilizer and 0.3 to 2 parts by weight of modifier. According to the polybutylene terephthalate resin composition provided by the invention, through screening of all the components and synergistic compounding of the components, the polybutylene terephthalate resin composition has excellent glowing filament performance and tensile strength and good injection molding appearance, and can be applied to the field of electronics and electricity.

The invention provides a PBT / PPO alloy material suitable for online spraying and a preparation method of the PBT / PPO alloy material. The alloy material is prepared from the following raw material components in parts by weight: 50 to 60 parts of PBT (Polybutylene Terephthalate), 15 to 25 parts of PPO (Polyphenylene Oxide), 8 to 12 parts of a toughening agent, 0.5 to 2 parts of a lubricating agent, 0.2 to 1.0 part of an antioxidant and 1 to 2 parts of conductive carbon black, wherein the conductive carbon black is obtained by modifying carbon black, the iodine absorption value of the carbon black is 1000-1400 mg / g, the oil absorption value of the carbon black is 300-340 mL / 100 g, and the finally prepared PBT / PPO composite material has high flowability, high impact, high heat resistance and good spraying performance and can be used for manufacturing parts with high weather resistance requirements such as automobile charging port covers and door handle decoration covers.

The invention relates to a polybutylene terephthalate resin composition as well as a preparation method and application thereof. The polybutylene terephthalate resin composition is prepared from the following components in parts by weight: 45 to 55 parts by weight of polybutylene terephthalate, 8 to 15 parts by weight of halogen-free flame retardant, 1 to 6 parts by weight of halogen-free synergist, 25 to 35 parts by weight of glass fiber, 1 to 3 parts by weight of physical covering agent, 0.1 to 0.6 part by weight of main antioxidant and 0.1 to 0.6 part by weight of auxiliary antioxidant, the polybutylene terephthalate resin composition also contains free organic silicon; the total content of silicon elements in free organic silicon in the polybutylene terephthalate resin composition is 1 to 500 ppm. The polybutylene terephthalate resin composition provided by the invention has excellent injection molding processing color stability, flame retardant property and mechanical property through the design of each component and dosage.

The present invention discloses a method for preparing a modified PHA composite material using a twin-screw extruder and its application. The method is carried out by in-situ melt blending of polyhydroxyalkanoate PHA, polybutylene terephthalate-adipate PBAT, polyvinyl alcohol PVOH and a chain extender in a twin-screw extruder, so that a multifunctional epoxy or isocyanate chain extender reacts with the terminal groups of PHA, PBAT and PVOH molecules to form a partially cross-linked or grafted structure, thereby achieving enhanced compatibility, improved thermal stability and significant improvement in barrier properties. Experiments have shown that the modified PHA composite material obtained by the present invention has high strength, high elongation, excellent water and oxygen barrier properties and biodegradable properties, and meets the stringent requirements for mechanical properties and barrier properties in multiple fields such as food packaging, agricultural mulch and medical consumables. The preparation method of the present invention is simple and efficient, and can be used for large-scale continuous production on existing twin-screw extrusion equipment.

The invention discloses a glass fiber reinforced halogen-free flame-retardant high glowing filament PBT (polybutylene terephthalate) modified material and a preparation method thereof, and the glass fiber reinforced halogen-free flame-retardant high glowing filament PBT modified material comprises the following components in parts by weight: 28.5-44.5 parts of PBT resin, 0-10 parts of PET (polyethylene terephthalate) resin, 18-25 parts of a compound of organic hypophosphite and inorganic hypophosphite, 5-14 parts of a glowing filament synergist and 1-5 parts of a modified toughening agent, the invention relates to the technical field of high polymer materials, in particular to a high polymer material which comprises the following components in parts by weight: 0.1-0.5 part of an anti-transesterification agent, 0.2-1 part of an antioxidant, 0.2-1 part of a lubricant and 15-30 parts of glass fibers. The glowing filament has high mechanical properties and good fireproof performance, can meet the market demand that the glowing filament at 750 DEG C is not ignited in the whole process, meets the latest environment-friendly control requirement on the market, and has wide market application prospects.

The invention discloses a wear-resistant rabbit hair-like fiber and a preparation method thereof, and belongs to the technical field of fiber processing, and the preparation method specifically comprises the following steps: adding polybutylene terephthalate, modified polyborosiloxane, a flexibilizer, polyamide and an auxiliary additive into a twin-screw extruder, carrying out melt extrusion, pelletizing and drying to obtain a composite polyester master batch, and carrying out melt extrusion, pelletizing and drying to obtain the wear-resistant rabbit hair-like fiber. The method comprises the following steps: by taking polybutylene terephthalate and polyamide as base materials, modified polyborosiloxane and a toughening agent as reinforcing agents and an auxiliary additive as an auxiliary agent, preparing curled rabbit-hair-like filaments through melt spinning, impregnating rabbit-hair-like fibers to obtain a coating formed by combining an organic material and an inorganic material, and performing thermal relaxation treatment to obtain the rabbit-hair-like composite material. The mechanical property and wear resistance of the rabbit hair-like fiber are effectively improved, and the hydrophilic property of the rabbit hair-like fiber is also improved.

The invention discloses a warp-resistant mineral reinforced PC / PBT alloy material with dimensional stability and a preparation method thereof, and relates to the technical field of polymer composite materials. The preparation method comprises the following steps: weighing polycarbonate, polybutylene terephthalate, ureido pyrimidone-polydimethylsiloxane, epoxy polyhedral oligomeric silsesquioxane, polyimide coated halloysite nanotubes, magnesium-aluminum hydrotalcite, perfluoroalkyl modified boron nitride nanosheets, liquid crystal polymer microfibers, modified PVA (Polyvinyl Alcohol) fibers and a silane coupling agent KH550 according to a ratio; the preparation method comprises the following steps: pre-mixing polycarbodiimide and a composite antioxidant to obtain a mixture, mixing, adding into a double-screw extruder, extruding and granulating, drying, carrying out injection molding, and standing at constant temperature and constant humidity to obtain the composite material. The invention has the significance of providing the PBT / PC alloy material with dimensional stability, warping resistance, low shrinkage rate, low hygroscopicity, creep resistance, impact resistance, arc resistance and chemical corrosion resistance for consumer-grade and industrial-grade underwater plastic parts.

The invention belongs to the technical field of copolymerization modification of degradable polyester, and relates to a depolymerization method and application of polybutylene terephthalate. During depolymerization, polybutylene terephthalate, dimethyl carbonate and dihydric alcohol are mixed and then subjected to a depolymerization reaction, and an intermediate ester is prepared; the dihydric alcohol is dihydric alcohol which does not form a ring with dimethyl carbonate in the depolymerization reaction process; the molar weight of the dimethyl carbonate is 10-30% of the molar weight of a repetitive unit of the polybutylene terephthalate; the sum of the molar weight of a 1, 4-butanediol unit in the polybutylene terephthalate and the molar weight of the added dihydric alcohol is a, the sum of the molar weight of a terephthalic acid unit in the polybutylene terephthalate and the molar weight of the added dimethyl carbonate is b, and the ratio of b to a is (1.2-1.5): 1; during application, the prepared intermediate ester is subjected to transesterification under the condition of negative pressure to obtain the copolyester. The depolymerization method is simple and easy to implement; the depolymerization product can be directly applied.

The invention discloses a copper-clad plate material containing elastomer resin and a preparation method of the copper-clad plate material, and belongs to the technical field of new materials. The method comprises the following steps: mixing a styrene-butadiene-styrene block copolymer with polybutadiene rubber, adding nano-montmorillonite, and carrying out intercalation modification through hexadecyl trimethyl ammonium bromide to prepare nano-modified elastomer resin; the preparation method comprises the following steps: mixing polybutylene terephthalate with nano silicon dioxide, and carrying out surface modification by gamma-aminopropyltriethoxysilane and hexamethyldisilazane to obtain a resin matrix; mixing the two phases, adding citric acid, and carrying out microwave heating and high-shear dispersion to obtain a discrete material; carrying out hot pressing on the dispersion, adding polyurethane and polylactic acid, uniformly mixing, adding polydimethylsiloxane and sodium dodecyl benzene sulfonate, and curing to obtain a cured product; and coating the surface of the cured product with a nano-copper layer. The material has the characteristics of high peel strength, low dielectric loss, low water absorption and low thermal expansion, and is suitable for the field of high-speed low-loss copper-clad plates.

Disclosed is a polyester resin composition that contains a polybutylene terephthalate resin (A) and a polyethylene terephthalate resin (B). The amount of terminal hydroxyl groups in the polybutylene terephthalate resin (A) is 30-70 mmol / kg with respect to the total amount of the polybutylene terephthalate resin (A) and the polyethylene terephthalate resin (B).

The invention belongs to the technical field of packaging materials, and particularly relates to a composite film paper material and a preparation method thereof. The composite film paper material comprises a composite film layer and a paper layer, the composite film layer is prepared from the following components in parts by weight: 60 to 70 parts of polylactic acid, 20 to 30 parts of polybutylene terephthalate adipate, 5 to 8 parts of polyether polyol, 5 to 8 parts of esterified hydrophobic fumed silica and 3 to 5 parts of quinoline; the preparation process of the esterified hydrophobic fumed silica comprises the following steps: stirring fumed silica and acetyl chloride, and drying to obtain the esterified hydrophobic fumed silica. The esterified hydrophobic fumed silica, the polylactic acid, the quinoline and the polyether polyol are mixed according to a scientific proportion, and the barrier property of the composite film paper material is remarkably improved by utilizing the hydrophobicity of the esterified hydrophobic fumed silica and a compact structure formed among the components, and meanwhile, the mechanical property of the composite film paper material is not influenced.

The invention discloses a high-strength and high-conductivity glass fiber reinforced PBT (polybutylene terephthalate) composite material and a preparation method thereof. The high-strength and high-conductivity glass fiber reinforced PBT composite material is prepared from the following raw materials in percentage by weight: 40 to 90 percent of polybutylene terephthalate (PBT) resin, 5 to 30 percent of chopped glass fiber, 0.1 to 10 percent of carbon nanostructure material CNS, 0.1 to 10 percent of dispersing aid, 0.1 to 15 percent of toughening agent, 0.1 to 5 percent of antioxidant and 0 to 2 percent of other aids. The high-strength and high-conductivity glass fiber reinforced PBT composite material disclosed by the invention has relatively high tensile strength and bending strength, excellent conductivity and good injection molding performance, and can be widely applied to the automobile interior industry and the electronic and electric appliance industry.

The present application relates to the technical field of current collectors, and specifically relates to a multilayer composite film and a current collector prepared from same. The present application provides a preparation method for the multilayer composite film. The multilayer composite film comprises a layer X, a layer Y and a layer Z from top to bottom; the layer X and the layer Z are made of polyimide, and the polyimide is a polycondensation reactant of carboxylic acid anhydride and diamine; and the material of the layer Y is any one or more of polypropylene, polyethylene, polyethylene terephthalate, polybutylene terephthalate, polyvinylidene fluoride, polytetrafluoroethylene, polyphenylene sulfide, polyphenyl ether, polyester, polystyrene and derivatives thereof. The polyimide prepared in the present application solves the problems of low solubility and poor processability of conventional fully aromatic polyimides, and a composite current collector is prepared by using heat resistance and improved surface polarity of polyimides, thereby improving the bonding force between a composite current collector film and a metal layer, and improving the tensile strength of a finished product.

The invention discloses a processing method of a polybutylene terephthalate bar with laser etching performance, and relates to the technical field of high polymer material processing and surface modification.The processing method comprises the following steps that in the material melting stage, a synchronous observation system of a melt rheological behavior and a temperature field is established, micro-amplitude sine torque disturbance is introduced, and the temperature field is measured; obtaining dynamic response of viscosity and shear rate, and generating a flowing fingerprint baseline; and performing spectrum decomposition on the flow fingerprint baseline, extracting signal components causing pressure pulsation, determining a critical shear rate threshold and time delay thereof, and forming a discrimination condition of an unstable region. According to the method, shear characteristics are extracted through rheological disturbance and thermal field synchronous observation, space mask driving process simulation is constructed, a feedforward adjusting curve is output, density online estimation and phase recognition are introduced, micro-pulse disturbance and temperature fine adjustment are combined, closed-loop control is formed, melt flow is dynamically stabilized, and laser engraving consistency and the product yield are improved.

A packaging bag including a polyester-based multilayer film. The multilayer film includes at least: an innermost layer formed of a biaxially stretched polyethylene terephthalate film; a layer formed of polybutylene terephthalate; and / or a layer formed of a blend of polyethylene terephthalate and polybutylene terephthalate. The biaxially stretched polyethylene terephthalate film has a heat sealing portion that is amorphized or low-crystallized by laser light irradiation. The packaging bag is formed by allowing the innermost layers of the polyester-based multilayer film to be opposed to and superimposed on each other, and heat sealing the heat sealing portions.

The invention discloses a method for preparing poly (butylene adipate-co-terephthalate) by a one-step method. The method comprises the steps of terephthalic acid esterification, adipic acid esterification, secondary esterification of terephthalic acid esterification liquid and adipic acid esterification liquid, and condensation polymerization, wherein terephthalic acid esterification and adipic acid esterification are synchronously carried out; in the terephthalic acid esterification process, a catalyst and a heat stabilizer are mixed and heated to obtain a mixed catalyst, and after terephthalic acid esterification reaction generates water, the mixed catalyst is added into a reaction system in a manner of feeding under the liquid level, so that on one hand, hydrolysis of the catalyst is reduced, and the catalytic efficiency of the catalyst is improved; on the other hand, the heat exchange efficiency is reduced and the energy consumption is increased due to the fact that a catalyst hydrolysis product covers a heat exchange pipeline; under the condition of not supplementing a catalyst, the synthesized product with qualified indexes such as PBAT melt index, color value, terminal carboxyl group and the like can be realized through subsequent secondary esterification and polycondensation.

The invention belongs to PBT (polybutylene terephthalate) materials, and particularly discloses a glass fiber reinforced PBT material as well as a preparation method and application thereof. According to the glass fiber reinforced PBT material, in the injection molding process, the hydrolysis resistance of PBT is improved, meanwhile, the hydrolysis-resistant agent can absorb oligomers or small molecular substances generated by PBT or auxiliaries, the content of the oligomers and the small molecular substances in a system is reduced, and the problem of mold scale generated in the injection molding process is solved.

The invention relates to a polybutylene terephthalate resin composition as well as a preparation method and application thereof. The polybutylene terephthalate resin composition comprises bio-based polybutylene terephthalate resin, a titanium element, a phosphorus element and a cobalt element, the weight content of a titanium element in the polybutylene terephthalate resin composition is 20 to 150 ppm, the weight content of a phosphorus element is 2 to 50 ppm, and the weight content of a cobalt element is 4 to 100 ppm; the mass ratio of the titanium element to the phosphorus element to the cobalt element in the polybutylene terephthalate resin composition is (2-20): (1-2): (1-10). According to the polybutylene terephthalate resin composition provided by the invention, the weight content and the mass ratio of the titanium element, the phosphorus element and the cobalt element are controlled in a proper range, so that the polybutylene terephthalate resin composition has high whiteness, excellent mechanical property and ageing resistance.

The invention discloses a waterproof bag film material and a preparation method thereof, relates to the technical field of polybutylene terephthalate polymer materials, and belongs to the patent classification number C08L67 / 02. The method comprises the following steps: sequentially carrying out silane coupling agent modification and solid-phase free radical polymerization on activated gas-phase nano silicon dioxide to construct a core-shell structure nano reinforced filler with rich epoxy groups on the surface; carrying out melt blending extrusion on the mixture, PBT (Polybutylene Terephthalate) resin, a chain extender, an end-capping reagent and the like to obtain hydrolysis-resistant modified granules; a PBT base film is prepared through casting, two-way stretching and heat setting; the preparation method comprises the following steps: performing ultraviolet ozone activation on a base film, coating a super-hydrophobic coating solution prepared from aminated nano silicon dioxide, epoxy-terminated polydimethylsiloxane, a cross-linking agent and an accelerant, and heating and curing to finally obtain the high-strength high-waterproof PBT waterproof bag film. The prepared film has excellent mechanical strength, body hydrolysis resistance and super-hydrophobic surface, the water contact angle is high, the coating adhesive force is high, and the waterproof performance is lasting and stable under high-frequency bending.

The invention discloses a PBT (polybutylene terephthalate) composition as well as a preparation method and application thereof. The PBT composition is prepared from the following components in parts by weight: 44 to 56 parts of PBT resin; 10 to 15 parts of ethylene bis (tetrabromo) phthalimide; 25 to 35 parts of glass fiber; and 0.5-1 part of an ultraviolet light absorber. According to the glass fiber reinforced PBT composition disclosed by the invention, the specific ethylene bis (tetrabromo-phthalimide) is added into the glass fiber reinforced PBT composition and is matched with the specific ultraviolet light absorber, so that the prepared PBT composition has an effect of small color difference change after aging; and the method is particularly suitable for workpieces with long-time outdoor working condition requirements, such as intelligent ship outdoor units, photovoltaic supports, air conditioner outdoor unit components, new energy battery parts and the like.

The invention relates to the technical field of engineering plastics, in particular to a light-transmitting laser-weldable glass fiber reinforced PBT (Polybutylene Terephthalate) material and a preparation method thereof. The glass fiber reinforced PBT material is prepared from the following raw materials in parts by weight: 120 to 140 parts of PBT resin, 20 to 40 parts of PC resin, 30 to 50 parts of glass fiber, 0.01 to 0.02 part of graphene oxide grafted hyperbranched polyamide, 0.2 to 2 parts of silane coupling agent, 0.2 to 2 parts of flowable agent, 0.2 to 2 parts of lubricant, 0.2 to 1 part of antioxidant, 0.5 to 1.5 parts of ester exchange inhibitor and 0.4 to 2 parts of dispersant. The method has the advantage of improving the strength of the laser-weldable PBT material.

The invention provides a brominated flame-retardant polybutylene terephthalate composite material and a preparation method thereof. The brominated flame-retardant polybutylene terephthalate composite material is prepared from the following components in parts by weight: 27 to 58 parts of polybutylene terephthalate resin, 1 to 15 parts of polyether sulfone resin, 13 to 42 parts of a reinforcing agent, 10 to 20 parts of a brominated flame retardant and 2 to 8 parts of a flame-retardant synergist, the polyarylether sulfone resin is selected from polyphenyl sulfone and / or polyethersulfone. According to the brominated flame-retardant polybutylene terephthalate composite material and the preparation method thereof, the specific composition of the brominated flame-retardant polybutylene terephthalate composite material is designed, and the brominated flame-retardant polybutylene terephthalate composite material with excellent comprehensive performance is prepared through the matching effect of the specific polyether sulphone resin and other components; under the conditions of high temperature and high humidity, the mechanical strength retention rate is relatively high, the shrinkage rate is small, and meanwhile, the flame retardance and the tensile property are relatively high.

The invention discloses a chemical-resistant PC / PBT alloy material and a preparation method thereof. The chemical-resistant PC / PBT alloy material is prepared from the following components in percentage by mass: 25 to 45 percent of polycarbonate, 20 to 35 percent of polybutylene terephthalate, 3 to 12 percent of maleic anhydride grafted ethylene-acrylate copolymer, 6 to 18 percent of sulfonated polytetrafluoroethylene and 4 to 19 percent of nano silicon dioxide coated silicone microspheres, the composite material is prepared from the following components in percentage by weight: 0.5 to 6 percent of triphenyl phosphate modified graphene oxide, 0.1 to 3.5 percent of bis (2, 4-di-tert-butylphenyl) pentaerythritol diphosphite, 0.2 to 3.2 percent of vinyl trimethoxy silane and 0.5 to 2.5 percent of mesoporous silicon dioxide; the total mass percentage of the components is 100%. Through component fine SPTFE chain segment regulation and control, core-shell microsphere interface optimization, graphene intercalation modification and process dynamic crosslinking, graded mixing and ultraviolet radiation assistance, the breakthrough improvement of the chemical resistance of the PC / PBT alloy material is realized.

The invention discloses a high-flowability antistatic PBT (polybutylene terephthalate) material and a preparation method thereof, and the high-flowability antistatic PBT material comprises the following raw materials by weight: 50-80 parts of polybutylene terephthalate; 10 to 30 parts of glass fiber; 2 to 5 parts of a hyperbranched macromolecule / antistatic agent premix; 1-3 parts of an antistatic agent; the hyperbranched macromolecule / antistatic agent premix has a structure, an antistatic agent enters the inner cavity of the hyperbranched macromolecule, and the antistatic agent is selected from at least one of glycerol monostearate, alkyl amino acid salt or phosphate salt. The high-flowability antistatic PBT has the advantages of lasting antistatic property and high flowability, is suitable for injection molding of precise parts with thin walls and complex structures, and has obvious advantages in cost compared with permanent antistatic materials.

The invention relates to a low-temperature high-shrinkage polyester heat shrinkage film capable of replacing a PVC label and a preparation method thereof, and belongs to the technical field of polymer packaging materials, the low-temperature high-shrinkage polyester heat shrinkage film capable of replacing the PVC label comprises the following raw materials: modified polyethylene glycol terephthalate, polybutylene terephthalate, a reinforcing and toughening agent and an opening and slipping agent; the thickness of the obtained polyester heat shrink film is 30.0-100.6 [mu] m, the TD tensile strength is 127-153 MPa, the MD tensile strength is 33-41 MPa, the TD elongation at break is 26-34%, the MD elongation at break is 220-313%, the TD shrinkage rates are 45-56% (70 DEG C, 10 s) and 68-80% (100 DEG C, 10 s), the MD shrinkage rates are 1-10% (70 DEG C, 10 s) and 1-14% (100 DEG C, 10 s), the haze is 3.6-5.8%, and the dynamic friction coefficient is 0.30-0.53 [mu] s.

Disclosed is a polybutylene terephthalate composition comprising polybutylene terephthalate (PBT), an amorphous polymer having a refractive index of at least 1.55 and free of carbonate groups, an alkali metal carbonate or bicarbonate, optionally glass fibers, and optionally additives, which exhibits significantly enhanced LT compared to polybutylene terephthalate compositions without such carbonate and / or bicarbonate while maintaining a balance of other properties.