498 results about "Polybutylene terephthalate" patented technology

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 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 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.

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 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 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 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.

The invention discloses self-adhesive single-component liquid silicone rubber with low compression set and a preparation method thereof. The preparation method comprises the following steps: kneading high-viscosity double-end vinyl polydimethylsiloxane, white carbon black, hexamethyldisilazane and water to prepare base rubber; and uniformly mixing and stirring the base rubber with double-end vinyl polydimethylsiloxane, polydimethylmethylvinylsiloxane, polydimethylmethylhydrosiloxane, a first functional aid, a second functional aid, an inhibitor and a catalyst in proportion to prepare the single-component liquid silicone rubber. The silicone rubber has excellent bonding performance on various substrates such as stainless steel, aluminum materials, copper materials, kovar alloys, nylon, polycarbonate and PBT (polybutylene terephthalate), has excellent mechanical properties and low compression set rate, is suitable for sealing and bonding of various automobile, industrial and electronic components, and has wide application prospects. The present invention relates to a sealing strip, in particular to a sealing adhesive scenario for in-situ curing sealing gasket (CIPG) applications, instead of a conventional sealing strip.

The invention relates to the technical field of diffusion plate preparation, in particular to a composite heat-resistant diffusion plate and a preparation process thereof.The diffusion plate sequentially comprises a core layer, a middle layer and a surface layer from bottom to top, wherein the middle layer is prepared from the following components in parts by mass: 55 to 60 parts of polyethylene glycol terephthalate, 30 to 40 parts of polybutylene terephthalate, 1.5 to 2 parts of titanate coupling agent, 5 to 8 parts of chopped glass fiber, 5 to 7 parts of phosphorus flame retardant and 0.5 to 1 part of maleic anhydride grafted SEBS. The composite heat-resistant diffusion plate provided by the invention shows remarkable advantages in the aspects of heat resistance, mechanical properties, optical properties, environmental protection and the like through innovative material selection, multi-layer structural design and precise process control, and has a remarkable application prospect.

The present invention discloses a degradable plastic, a container made from the plastic, and a preparation method thereof, belonging to the technical field of degradable plastic container processing. The preparation method of the degradable plastic comprises the following steps: mixing polybutylene terephthalate-adipate resin, starch, composite aerogel, modified corn straw fiber, a lubricant, and a plasticizer, stirring uniformly to obtain a mixture; and extruding and granulating the mixture to obtain a degradable plastic. The composite aerogel has gas barrier properties, improving the gas barrier properties of the polybutylene terephthalate-adipate plastic container. The composite aerogel also has high mechanical strength, preventing the leakage of modified ultrafine coal powder caused by the poor mechanical properties of the sericin aerogel, causing the modified ultrafine coal powder to migrate and precipitate in the plastic, affecting the degradation performance of the plastic.

The invention relates to the technical field of environment-friendly materials, and discloses an environment-friendly plastic bag which is of a three-layer composite structure composed of the following raw materials in parts by weight: an outer layer, 60-80 parts of polylactic acid, 40-60 parts of poly (adipic acid) or butylene terephthalate with a thickness ratio of 40%, and a middle layer, 75-90 parts of modified cassava starch, 25-35 parts of polyvinyl alcohol and 3-8 parts of a citrate cross-linking agent with a thickness ratio of 30%. The inner layer comprises 80-95 parts of polyhydroxybutyrate valerate and 15-25 parts of surface treatment calcium carbonate, the thickness ratio of the inner layer is 30%, the three layers are integrally formed through a co-extrusion film blowing process, and a micron-sized groove array is arranged on the surface of the outer layer. The outer layer adopts the blend of polylactic acid and dibutyl phthalate, the brittleness of polylactic acid is made up by utilizing the flexibility of dibutyl phthalate, and meanwhile, the use amount of pure polylactic acid is reduced, so that the cost is reduced by 40% compared with that of a pure polylactic acid bag; and 15 wt% of stearic acid is added into the inner layer polyhydroxybutyrate valerate to treat calcium carbonate, so that the performance is ensured, and the cost is controlled at the same time.

The invention belongs to the field of composite materials, and discloses a high-airtightness nano injection molding polybutylene terephthalate composite material and application thereof. The composite material comprises the following components in percentage by weight: 23%-82.5% of PBT (Polybutylece Terephthalate); 5%-15% of polyarylester; 2%-8% of a reactive flexibilizer; 0.5 to 2% of an ionomer; 0-1% of an antioxidant; 0-1% of a release agent; 10%-50% of glass fiber; the PBT composite material provided by the invention can realize high and stable air tightness, and also has high aluminum alloy binding force and good mechanical properties. Meanwhile, the preparation method disclosed by the invention is simple and feasible, and is suitable for large-scale production.

The present invention discloses a method for preparing a modified starch composite material having both thermoplasticity and cross-linking properties, and belongs to the technical field of polymer material modification. First, triphenylmethane triisocyanate is mixed with corn starch to react and prepare cross-linked starch; secondly, N, N-dimethylformamide is mixed with sorbitol and then a composite plasticizer is prepared, and after mixing with the cross-linked starch, melt extrusion is performed to obtain thermoplastic cross-linked starch; finally, thermoplastic cross-linked starch and polybutylene terephthalate adipate are melt-extruded to obtain a modified starch composite material having both thermoplasticity and cross-linking properties. The modified starch composite material having both thermoplasticity and cross-linking properties prepared by the present invention has high strength and high toughness, with tensile strength increased from 8.23Mpa to 22.53Mpa, flexural strength increased from 2.14Mpa to 4.26Mpa, and elongation at break increased from 382% to 650%.

The invention discloses a hydrolysis-resistant PBT reinforced material capable of being subjected to laser welding and a preparation method of the hydrolysis-resistant PBT reinforced material, and belongs to the field of engineering plastics. Comprising the following raw materials in parts by mass: 45-70 parts of PBT resin, 0.5-1 part of a nucleating agent, 0.5-1 part of a nucleating auxiliary agent, 0.1-1 part of an antioxidant, 0.1-1 part of a lubricant, 0.2-0.8 part of a hydrolysis-resistant agent, 1-3 parts of a toughening agent and 25-45 parts of glass fibers, the nucleating auxiliary agent is sodium-doped potassium aluminosilicate. The nucleating agent can improve the crystallization rate of PBT, refine the grain size and reduce light scattering, and the hydrolysis-resistant agent can block autocatalytic hydrolysis circulation. And the composite sodium-doped potassium aluminosilicate not only can provide a large number of sites for PBT nucleation, but also can adsorb and capture water molecules in the environment and small molecules in an adsorption material and reduce hydrolysis reaction, so that the reinforced PBT material can be suitable for laser welding, and the long-term stability of the material in a high-temperature and humid environment can be guaranteed.

The present invention discloses an anti-collapse PBT / PA12 sharpened toothbrush filament and its preparation method. The raw materials contain the following components by weight: 60-90 parts of polybutylene terephthalate (PBT), 10-40 parts of nylon 12 (PA12), 1-5 parts of amphiphilic block copolymer, 0.1-0.5 parts of antioxidant, and 0.1-0.5 parts of lubricant. The amphiphilic block copolymer used in the present invention is a block copolymer formed by the amidation reaction of a dicarboxyl-terminated polybutylene terephthalate oligomer and a diamino-terminated nylon 12 oligomer. This amphiphilic block copolymer can effectively improve the compatibility of PBT and PA12, and achieve the submicron-sized dispersion of the PA12 dispersed phase in the PBT matrix. A kind of anti-collapse PBT / PA12 sharpened toothbrush filament is prepared by melt spinning and filament cake sharpening of the blend.

The invention discloses a high specific surface area polyester fiber and a preparation method thereof, polybutylene terephthalate, polyethylene glycol and an antioxidant are put into a twin-screw extruder in proportion to obtain modified polyethylene glycol, the modified polyethylene glycol is used as a sea phase, the modified polyethylene glycol and PET are used as an island phase to carry out melt blending spinning, and after heat setting, drafting is carried out to obtain a sea-island fiber with PET as the island phase. An alkali dissolution-alcohol dissolution synergistic effect system is constructed by utilizing the alkali dissolution characteristic of low-molecular-weight polybutylene terephthalate and the alcohol dissolution characteristic of polyethylene glycol in the marine phase component, under the condition of 50-60 DEG C, an alkali agent directionally breaks ester bonds of polybutylene terephthalate, an alcohol solvent synchronously dissolves polyethylene glycol, efficient marine phase stripping is achieved, and the service life of the marine phase component is prolonged. And finally, the high-specific-surface-area polyester fiber with a complete structure and an excellent specific surface area is prepared.

The invention relates to the field of textile fabrics, and discloses a polylactic acid fabric and a preparation method thereof. The polylactic acid fabric is prepared by weaving polylactic acid fibers, the polylactic acid fibers are prepared by melt spinning of a polylactic acid material body, and the polylactic acid material body is prepared from the following raw materials in parts by weight: 100-120 parts of polylactic acid resin, 12-20 parts of a heat-resistant moisture absorbent, 6-10 parts of a toughening agent and 0.2-0.4 part of an antioxidant; the heat-resistant moisture absorbent is prepared from lignin fibers, poly (ethylene 2, 5-furandicarboxylate), poly (butylene adipate-co-terephthalate) and a dispersing agent. The preparation method comprises the following steps of melt spinning, rib knitting, heat setting, dyeing and aftertreatment. The polylactic acid fabric prepared by the invention has better heat resistance, moisture absorption and shrink deformation resistance, and is suitable for scenes with higher requirements on heat resistance and moisture absorption, such as underwear or infant clothes.

The invention provides a composite film material which is prepared by the following steps: adding polybutylene terephthalate adipate, a lignin carbohydrate complex and thermoplastic starch into a Haake rheometer according to a certain proportion, carrying out melt blending until the torque is balanced, and carrying out hot-pressing film formation in a press vulcanizer. The film material disclosed by the invention has good mechanical strength and easy-to-degrade performance, relatively high light transmittance and good hydrophobicity, and is completely suitable for the fields of environment-friendly films, mulching films or biodegradable packaging materials and the like. Besides, the preparation method of the film material is simple in process and low in cost, an organic solvent and a plasticizer do not need to be added in the preparation process, a biomass material is used as a filler, and meanwhile the purposes of efficient utilization of biomass resources and environmental friendliness are achieved.

Thermoplastic compositions include: a. from about 1 wt% to about 70 wt% of a polycarbonate homopolymer component; b. from about 10 wt% to about 40 wt% of a polybutylene terephthalate (PBT) component; c. from about 5 wt% to about 30 wt% of a polycarbonate copolymer component; and d. from about 1 wt% to about 15 wt% of a flame retardant component comprising a cyclic phosphazene compound having an oxaphosphorin ring-containing structure. The compositions have improved heat resistance and flame retardant properties.

The invention discloses recycled polybutylene terephthalate and a preparation method thereof. The recycled polybutylene terephthalate is polybutylene terephthalate (PBT) obtained by directly carrying out chemical depolymerization and ester exchange on recycled polyethylene terephthalate and 1, 4-butanediol by using a titanium catalyst chelated with polybasic acid or polybasic alcohol and polymerizing, so that the manufacturing procedures are reduced, and products with good physical properties are produced.

The present application relates to a fan blade (10) for an industrial axial fan. The fan blade (10) comprises an airfoil (12) and a blade root (14) arranged proximal to the airfoil (12) and configured for attaching the fan blade (10) to a hub (62) of an axial flow fan. The airfoil (12) includes a tip (22) at a distal end (23) and a base (24) at a proximal end (25), a leading edge (26) and an oppositely disposed trailing edge (28), whereby both edges (26, 28) extend from the tip (22) to the base (24). The airfoil (12) has a variable thickness defined as a distance between a top surface (30) and a bottom surface (32). Furthermore, the airfoil (12) is an injection molded unitary structure integrally formed in one piece from a composite material, where the composite material comprises carbon fibers and a thermoplastic selected from the group consisting of polyamide, polybutylene terephthalate and polypropylene.