230 results about "Polyethylene terephtalate" patented technology

The invention discloses a method for preparing a modified PHA composite material by using a twin-screw extruder and application of the modified PHA composite material. The method comprises the following steps: carrying out in-situ melt blending on polyhydroxyalkanoate (PHA), poly (butylene adipate terephthalate)-poly (butylene adipate terephthalate) (PBAT), polyvinyl alcohol (PVOH) and chain extenders in a twin-screw extruder, so that the chain extenders such as polyfunctional group epoxy or isocyanate react with molecular terminal groups of the PHA, the PBAT and the PVOH to form a partially crosslinked or grafted structure; therefore, the compatibility is enhanced, the thermal stability is improved, and the barrier property is remarkably improved. Experiments prove that the obtained modified PHA composite material has the characteristics of high strength, high elongation, excellent water and oxygen resistance and biodegradability, and meets the strict requirements of multiple fields such as food packaging, agricultural plastic mulching films, medical consumables and the like on mechanical properties and barrier properties. The preparation method is simple, convenient and efficient, and large-scale continuous production can be achieved on existing double-screw extrusion equipment.

Disclosed in the present invention are a high-strength polylactic acid material, a preparation method therefor, and use thereof, belonging to the technical field of macromolecular materials. The high-strength polylactic acid material comprises the following components in parts by weight: 80-90 parts of polylactic acid, 10-20 parts of polybutylene adipate terephthalate, 1-5 parts of a nucleating agent, and 2-5 parts of a compatibilizing agent. The mesh number of the nucleating agent is 1500-2500 mesh; the compatibilizing agent is polycaprolactone, and the intrinsic viscosity thereof is 1.0-3.0 dL / g. The present invention lowers the melting temperature and shortens the melting time of PLA and PBAT, reduces the negative impact of polymer degradation and aging on mechanical properties, produces a heterogeneous nucleation effect, and performs the function of a crystallization nucleus in the cooling crystallization stage, improving crystallization speed and crystallinity, while causing the crystalline phase structure to tend toward a spherulitic state, improving the tensile strength of the polylactic acid material.

The present application relates to the technical field of bio-based polymer material, and more particularly to a full bio-based PBAT-PLA copolymer, a preparation method and an application thereof, which is prepared by melt mixing bio-based polybutylene adipate terephthalate, bio-based polylactic acid and bio-based multi-epoxy chain extender through a twin-screw extruder, so that the tensile strength of the full bio-based PBAT-PLA copolymer is 31.5-44.3 MPa, and the elongation at break is 85-498%. The bio-based multi-epoxy chain extender prepared by specific selection can simultaneously improve the tensile strength and elongation at break of the full bio-based PBAT-PLA copolymer, and solve the technical problems of poor compatibility of traditional bio-based polylactic acid and non-bio-based polybutylene adipate terephthalate, and the technical problem that the addition of existing chain extenders cannot simultaneously improve the tensile strength and elongation at break of the copolymer.

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 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 application belongs to the technical field of plastics, and particularly relates to a degradable antibacterial plastic packaging bag and a preparation method thereof. The degradable antibacterial plastic packaging bag comprises the following raw materials in parts by weight: polycaprolactone 70-90 parts; polybutylene adipate terephthalate 20-40 parts; Cr and Cu co-modified ZIF-8 5-20 parts; and cerium oxide tannic acid material 2-6 parts. The Cr and Cu co-modified ZIF-8 synergistically improves the antibacterial performance of the packaging bag, and the addition of the cerium oxide tannic acid material further improves the antibacterial performance of the packaging bag. Moreover, the degradable antibacterial plastic packaging bag prepared by the application has excellent mechanical properties.

The invention discloses a modified polylactic acid high-temperature-resistant degradable composite material and a preparation method thereof, and relates to the technical field of degradable materials. The modified polylactic acid high-temperature-resistant degradable composite material at least comprises the following raw materials in parts by mass: 70-80 parts of polylactic acid; 15 to 25 parts by mass of a lignin-polylactic acid-polycaprolactone block copolymer; 5 to 10 parts by mass of poly (butylene adipate-co-terephthalate); 2-5 parts by mass of stearic acid modified nano silicon dioxide; 0.3 to 0.8 part by mass of an anti-hydrolysis agent; and 0.2 to 0.5 part by mass of an antioxidant. According to the prepared modified polylactic acid high-temperature-resistant degradable composite material, the mechanical property and the high temperature resistance of the polylactic acid composite material are improved, the degradation rate can be regulated and controlled through the proportion of all the components, and the use requirements of different scenes are met.

[Problem] To provide a method capable of producing a monocyclic aromatic hydrocarbon such as benzene or xylene effective as a base raw material, with a naphtha raw material containing renewable naphtha. [Solution] A method for producing at least one monocyclic aromatic hydrocarbon of benzene or xylene with a naphtha raw material containing renewable naphtha, the method including step (A-1) of pyrolyzing the naphtha raw material in the presence of water vapor, to produce and separate toluene, and step (A-2) of subjecting toluene to disproportionation reaction or transalkylation reaction, to produce and separate at least one monocyclic aromatic hydrocarbon of benzene or xylene.

The invention belongs to the technical field of degradable packaging materials, and discloses a preparation method of a degradable preservative film. The anti-fog antibacterial plastic is prepared from the following raw materials in parts by weight: 40 to 45 parts of poly (butylene adipate-co-terephthalate) (PBAT), 8 to 12 parts of polylactic acid (PLA), 28 to 32 parts of modified structural starch, 4 to 6 parts of poly (butylene carbonate) (PBC), 4 to 6 parts of talcum powder, 0.4 to 0.6 part of aluminate, 0.8 to 1.2 parts of a composite antibacterial agent and 2.5 to 3.5 parts of anti-fog master batch. The invention aims to overcome the defects in the prior art, and provides the degradable preservative film and the preparation method thereof, the preservative film not only has good degradability and mechanical properties, but also has excellent antibacterial and antifogging effects, and the preparation process is simple and easy for industrial production.

The invention discloses a degradable high-strength plastic bag and a preparation method thereof, and relates to the technical field of plastic bag preparation. The degradable high-strength plastic bag at least comprises the following raw materials in parts by mass: 40-60 parts of polylactic acid, 20-35 parts of poly (adipic acid) / butylene terephthalate, 5-15 parts of modified nano calcium carbonate, 3-8 parts of modified wood fibers, 6-8 parts of chitosan grafted polyglycidyl methacrylate nanoparticles, 0.5-2 parts of a lubricant, 0.3-1 part of an antioxidant and 2-5 parts of a degradation accelerator. And 0.5 to 1.5 parts of an ultraviolet stabilizer. According to the degradable high-strength plastic bag prepared by the preparation method disclosed by the invention, the polylactic acid and the poly (butylene adipate-co-terephthalate) are used as base materials, the modified nano calcium carbonate and the modified fibers are used as fillers, and the chitosan grafted polyglycidyl methacrylate nanoparticles are used as a compatilizer, so that the balance of high strength and degradability is realized; the prepared degradable high-strength plastic bag can be used as a high-performance flexible packaging material.

The invention belongs to the technical field of preparation of molecular materials and adhesive tapes, and discloses a degradable mylar adhesive tape and a preparation method thereof, the degradable mylar adhesive tape comprises a degradable base material layer and a degradable adhesive layer; the degradable base material layer is prepared from the following raw materials in parts by mass: 25-35 parts of poly (butylene succinate) (PBS), 20-30 parts of polylactic acid (PLA), 10-15 parts of polycaprolactone (PCL), 8-12 parts of modified bamboo fiber powder, 3-5 parts of a compatibilizer and 0.5-1 part of an antioxidant; the degradable adhesive layer is prepared from the following raw materials in parts by mass: 40 to 50 parts of a modified starch-based adhesive, 15 to 25 parts of poly (butylene adipate-co-terephthalate) (PBAT), 10 to 15 parts of polyhydroxyalkanoate (PHA), 5 to 8 parts of sodium alginate-chitosan composite gel, 5 to 8 parts of an epoxypropane modifier, 1 to 2 parts of a cross-linking agent and 0.3 to 0.5 part of a de-foaming agent; by optimizing the raw material composition and the preparation process of the base material and the adhesive, the full-life-cycle degradability of the adhesive tape is realized, and meanwhile, excellent mechanical properties, insulativity and temperature resistance are ensured.

Described is a method of preparing bis (2-hydroxyethyl) terephthalate (BHET) monomer crystals comprising the steps of providing a mixture of BHET monomers and oligomers thereof, a carrier liquid, and impurities; providing BHET seed crystals in the mixture; forming BHET monomer crystals from the mixture comprising the BHET seed crystals, thereby obtaining BHET monomer crystals in a mother liquor; and separating the BHET monomer crystals from the mother liquor; wherein the powder X-ray diffraction spectrum of the BHET seed crystals at least has characteristic intensity peaks at 2Ɵ about equal to 10.7°, 14.4°, 18.9° and 21.6°, where Ɵ is the angle of diffraction, and / or the IR spectrum of the BHET seed crystals at least has characteristic absorption peaks at λ about equal to 3260 cm-1 and 897 cm-1, where λ is the ordinary wavenumber. The obtained BHET monomer crystals have superior filtration properties. Also described is a method of preparing the BHET seed crystals, a method of depolymerizing a terephthalate polymer using the BHET seed crystals, as well as a corresponding reactor system for depolymerizing said terephthalate polymer.

The present application relates to the field of batteries and specifically discloses a lithium battery sealing material and a preparation method thereof. The lithium battery sealing material comprises the following raw materials in parts by weight: 100-150 parts of nylon, 5-15 parts of maleic anhydride grafted polypropylene, 10-20 parts of rosin glycerol ester, 5-10 parts of poly(trimethylene terephthalate), 5-15 parts of filler, 0.5-1 part of antioxidant, and 0.2-0.5 parts of dispersant. The preparation method comprises the following steps: uniformly mixing nylon, poly(trimethylene terephthalate), and maleic anhydride grafted polypropylene to obtain a primary mixture; uniformly mixing the filler and rosin glycerol ester, and then uniformly mixing the filler and the rosin glycerol ester with the primary mixture to obtain a mixture; adding the antioxidant and the dispersant to the mixture, stirring evenly, and extruding to obtain a finished product. The hygroscopicity of a button battery sealing ring is reduced, and the sealing ring is ensured to have high mechanical strength, good sealing effect, and long service life, thereby extending the service life of the button battery.

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 belongs to the technical field of plastics, and particularly relates to a biodegradable antibacterial plastic bag and a preparation method thereof. The material comprises the following raw materials in parts by weight: 20-40 parts of polylactic acid; 60 to 80 parts of polycaprolactone; 50 to 70 parts of poly (butylene adipate-co-terephthalate); 2-6 parts of a carbonized polymer; and 3 to 5 parts of the SrWO4-coated Cu and Zn-TCPP composite material. The carbonized polymer is prepared by adopting a carbon source through a hydrothermal method, the carbonized polymer plays a good role in inhibiting growth of bacteria, the antibacterial performance and mechanical performance of the plastic are improved by preparing tungstate and matching with the MOF material, and the prepared antibacterial plastic bag is excellent in performance, wide in market application and good in prospect.

The invention discloses a full-biodegradable mulching film capable of relieving microplastic release harm. The full-biodegradable mulching film is prepared from the following components in parts by weight: 100 to 150 parts of poly (butylene adipate-co-terephthalate); 0.5 to 1.5 parts of an ultraviolet light absorber; 0.5 to 0.6 part of an antioxidant; 0.5 to 0.6 part of a lubricant; and 2-8 parts of modified charcoal. The method comprises the following steps: pretreating biochar with a KOH solution to obtain pretreated biochar; adding the pretreated biochar into a glacial acetic acid solution of chitosan oligosaccharide, stirring at room temperature, dropwise adding a sodium citrate solution, standing at low temperature, centrifuging, washing, and drying in vacuum to obtain chitosan oligosaccharide grafted biochar; and adding the chitosan oligosaccharide grafted biochar into carbon black, and mixing to obtain the modified biochar. The modified biochar prepared by the method can replace carbon black to prepare a full-biodegradable mulching film with higher strength and water vapor permeability; after the mulching film is degraded, the biochar adsorbs the degraded micro-plastics, so that the damage of the micro-plastics to crops is reduced.

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 belongs to the technical field of biodegradable materials, and discloses a preparation method and application of aluminum ion cluster dynamic cross-linked toughened PBAT / TPS photo-thermal repair function thermoplastic plastic. The preparation method comprises the following steps: preparing the aluminum ion cluster, preparing the pre-plasticized starch, carrying out melt blending on the obtained pre-plasticized starch and the poly (butylene adipate-co-terephthalate), cooling and drying. Metal ions are complexed with lignin and thermoplastic starch TPS to form a metal ion dynamic network structure, so that the mechanical property of the material is remarkably improved, and the material is endowed with excellent photo-thermal repair performance. Meanwhile, the lignin and the starch are biomass materials, have degradability, are low in cost and easy to obtain, can effectively reduce the cost of the composite plastic, and are suitable for industrial large-scale production.

The invention relates to the technical field of bio-based degradable high polymer materials, in particular to a bio-based degradable pearl wool microcellular foaming material. The composite material is prepared from the following components in parts by mass: 70-85 parts of a bio-based polyester resin composite system of polylactic acid and poly (terephthalic acid)-butylene adipate (in a mass ratio of 60: 40-75: 25), 10-20 parts of bagasse microfibers modified by a silane coupling agent, 1.5-4 parts of a composite nucleating agent of flaky talcum powder and spherical nano calcium carbonate (in a mass ratio of 1.5: 1-2.5: 1), the bio-based plasticizer is prepared by compounding epoxidized soybean oil and tributyl citrate, the montmorillonite degradation accelerant is loaded with iron and cobalt ions (the molar ratio is 3: 1-5: 1), and the mixed foaming agent is prepared from 5-12 parts of supercritical carbon dioxide and nitrogen (the volume ratio is 60%-85%). A bio-based polyester composite system of polylactic acid and PBAT is adopted, silane modified bagasse microfibers are matched, montmorillonite loaded with iron and cobalt ions serves as a degradation accelerant, a bio-based plasticizer and the like are combined, and the composite material is prepared through a twin-screw extrusion melt blending and supercritical fluid foaming technology.

The invention discloses a deep embossing polyester facing film, a preparation method thereof and a polyester film facing plate. The polyester facing film is prepared from the following raw materials in percentage by weight: 10 to 20 percent of flame-retardant polyester and the balance of poly (1, 4-cyclohexanedimethanol terephthalate); the flame-retardant polyester is prepared by condensation polymerization of a first esterification product and a second esterification product in a mass ratio of (60-70): (20-30), the raw materials of the first esterification product comprise terephthalic acid and 1, 4-cyclohexanedimethanol in a molar ratio of 1: (1.05-1.3), and the raw materials of the second esterification product comprise a benzoxazine phosphate monomer and dihydric alcohol in a molar ratio of 1: (1.1-1.3). The benzoxazine phosphate chain segment is introduced into the PCT, so that the flame retardant property of the polyester facing film is remarkably improved on the basis of not keeping the mechanical property and the processability of the polyester material.

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.

The application relates to a polyethylene glycol-2,5-furandicarboxylic acid terephthalate copolymer foaming material and a preparation method thereof, and the preparation method comprises the following steps: melting polyethylene glycol-2,5-furandicarboxylic acid terephthalate copolymer, and then performing quenching treatment to obtain sheet material; performing annealing treatment on the sheet material, wherein the annealing treatment temperature is (T-25) DEG C to (T+5) DEG C, T is the cold crystallization starting temperature of the polyethylene glycol-2,5-furandicarboxylic acid terephthalate copolymer, and the annealing treatment time is 3 min to 30 min; the sheet material after the annealing treatment is adsorbed and saturated in a foaming gas to obtain a saturated system, and the saturated system is foamed in a foaming medium to obtain the polyethylene glycol-2,5-furandicarboxylic acid terephthalate copolymer foaming material. The polyethylene glycol-2,5-furandicarboxylic acid terephthalate copolymer foaming material obtained by the application has a cell size of 2 mu m to 200 mu m and an expansion ratio of 1.5 times to 15 times, and has a good application prospect.

This application relates to the field of electrochemical technology, specifically to polyester composite films and their preparation methods, composite current collectors and their preparation methods, electrodes and their applications. The polyester composite film of this application comprises: a polyester substrate layer and a first surface layer and a second surface layer respectively disposed on opposite sides of the polyester substrate layer; the polyester substrate layer comprises, by weight, 90 to 99 parts of polyester material and 1 to 10 parts of photo-straining material; the first and second surface layers comprise polyethylene terephthalate polymers; the transmittance of the first surface layer, the second surface layer, and the polyester material is independently 92% to 99%; the photo-straining material comprises one or more of barium titanate ceramics, lead zirconate titanate ceramics, PI / CNTs photosensitive composite materials, PEEK / anthraquinone photosensitive composite materials, MIL-101 chromium metal-organic frameworks, and UiO-66-NH2 / ZnO composite materials. The polyester composite film can easily break under high-destructive external forces such as battery breakdown and battery collision, effectively suppressing thermal runaway.

The invention relates to an environment-friendly insulated cable material and a preparation method thereof, and the material is prepared by taking poly (terephthalic acid-adipic acid-butanediol copolyester) (PBAT), polyethylene-vinyl acetate copolymer (EVA) and maleic anhydride grafted low-density polyethylene (LDPE-g-MAH) as matrixes, the composite modified filler is prepared from zinc borate powder with the surface modified by aminopropyl, a graphene oxide-block polyether grafted hybrid, titanate coupling treatment silicon microspheres, a microencapsulated polyether type phase change material, a polyphosphazene flame retardant, cerium-doped nano titanium dioxide and a photosensitive free radical initiator; the preparation method comprises the steps of in-situ modification, grafting hybridization, micro-capsule coating with an interfacial polymerization method and the like, and efficient synergy is achieved through multiphase dispersion and ultraviolet crosslinking. The material has excellent thermal stability, flame retardance and flexibility, has green and degradable characteristics, is suitable for high-performance cable sheaths and insulation structures, and particularly meets the application requirements for low smoke, zero halogen and sustainability.

The present application relates to a kind of polyethylene terephthalate-2,5-furandicarboxylic acid glycol copolyester foamed material and its preparation method, the preparation method includes the following steps: polyethylene terephthalate-2,5-furandicarboxylic acid glycol copolyester material is heat pressed, and the preform of molten state is obtained;The preform of molten state is treated with melt isothermal crystallization and quenching, and sheet material is obtained;Sheet material is treated with foaming, and polyethylene terephthalate-2,5-furandicarboxylic acid glycol copolyester foamed material is obtained.The present application uses melt isothermal crystallization treatment, can improve the melt strength in the foaming process of polyethylene terephthalate-2,5-furandicarboxylic acid glycol copolyester, strengthens its foaming performance, simultaneously can also be realized by strengthening bubble nucleation and controlling bubble growth to adjust the bubble morphology of foamed material, so polyethylene terephthalate-2,5-furandicarboxylic acid glycol copolyester foamed material with uniform bubble size and controllable foaming ratio can be obtained.

The invention discloses a degradable plastic master batch as well as preparation and application thereof. The degradable plastic master batch is prepared from the following raw materials in parts by mass: 40 to 60 parts of polylactic acid, 30 to 50 parts of poly (butylene terephthalate)-adipate, 10 to 20 parts of 9, 9-di-n-octylfluorene copolymer, 3 to 9 parts of degradation agent and 1 to 5 parts of lubricant. The 9, 9-di-n-octylfluorene copolymer is added into the plastic master batch taking polylactic acid and poly (butylene adipate-co-terephthalate) as matrixes, and the 9, 9-di-n-octylfluorene copolymer effectively improves the impact strength and tensile strength of the plastic master batch; in addition, by adding the degradation agent, the 9, 9-di-n-octylfluorene copolymer can be effectively degraded, so that the degradable plastic master batch with high impact strength and tensile strength is obtained.

The invention relates to a biodegradable mulching film raw material composition, a biodegradable mulching film and a preparation method of the biodegradable mulching film. The invention relates to a raw material composition for a biodegradable mulching film. Comprising the following components in parts by weight: 50 to 90 parts of poly (butylene terephthalate)-adipate, 5 to 20 parts of composite powder, 0.2 to 1 part of a coupling agent, 0.2 to 1 part of a lubricant, 5 to 30 parts of polypropylene carbonate and a modifier, 0.1 to 1 part of a hydrolysis time regulator, 0.4 to 1 part of a hindered amine light stabilizer, 0.2 to 0.5 part of an antioxidant and 0.2 to 0.8 part of a compatilizer. Wherein the composite powder comprises calcium carbonate and talcum powder; the crystal diameter of the calcium carbonate is 2-5 nanometers, and the crystal is needle-shaped or fibrous; the crystal size of the talcum powder is 2-5 nanometers, the crystal is in a sheet shape or a scale shape, and the length-diameter ratio of the crystal is larger than or equal to 20: 1. The biodegradable mulching film formed by the raw material composition has low water vapor permeability, and the biodegradation time and the degradation rate can be regulated and controlled.

The present application relates to polybutylene terephthalate (PBT) material toothbrush filament technical field, specifically relates to a kind of multifilament version anti-lodging PBT monofilament and preparation method thereof;The preparation method is realized with the basic concept of multifilament to realize the basic form of monofilament, in the drawing process, every three monofilaments are gathered into a multifilament, in the subsequent water cooling, oiling etc. Process path, with the mode of multifilament, drafting, winding forming are completed.In the condition that monofilament specification remains unchanged, corresponding design is carried out to production process, and the quality indexes such as breaking strength, breaking strength variation coefficient, breaking elongation, breaking elongation variation coefficient of monofilament are controlled.In the realization equipment efficiency is improved three times target, product quality is upgraded, and the anti-lodging performance of PBT monofilament is improved.

The present invention relates to novel carbodiimides, to a process for their production, and to the use of the novel carbodiimides in ester-based polyols, in polyethylene terephthalate (PET), in polybutylene terephthalate (PBT), in polytrimethylene terephthalate (PTT), in copolyesters, in thermoplastic polyester elastomers (TPE E), in ethylene vinyl acetate (EVA), in polylactic acid (PLA) and / or in PLA derivatives, in polybutylene adipate terephthalate (PBAT), in polybutylene succinate (PBS), in polyhydroxyalkanoates (PHA), in blends, in triglycerides, in thermoplastic polyurethanes, in polyurethane elastomers, in PU adhesives, in PU casting resins, for PU coatings or in PU foams as stabilizers.