129 results about "Polyethylene Terephthalates" patented technology

Disclosed herein are polyesters and articles made therefrom. The article comprising a substrate comprising a first surface and a second surface, the second surface in contact with an outside environment, wherein the substrate comprises a polymer comprising poly(trimethylene furandicarboxylate) (PTF), and wherein the polymer provides an improvement in gas barrier properties of the substrate as compared to a substrate comprising nascent polyethylene terephthalate) (PET).

A delivery system (114) for a self-expanding device (110) for placement in a bodily lumen, the system comprising a sheath (112) that confines the device to a radially compact delivery disposition until the device is to be released into the lumen, the system having an elongate pull element (118) to be pulled proximally from its proximal end, which pull element is arranged radially inside the sheath for pulling preferentially on a pull zone on the circumference of the distal end of the sheath, thereby to tear the sheath progressively along a tear line running the length of the sheath, starting at the distal end of the sheath, to release the device from the confining effect of the sheath, progressively, beginning at the distal end of the device and wherein the sheath is of polyethylene-terephthalate, cold drawn along its long axis, and in that the distal end of the sheath tapers inwardly to provide an inwardly tapered distal end of the system.

The invention discloses a polyethylene terephthalate and polyurethane composite artificial blood vessel and a preparation method thereof, belonging to the field of biomedical engineering. The artificial blood vessel is prepared from polyethylene terephthalate and polyurethane by means of an electrostatic spinning device with a stirrer. The prepared artificial blood vessel is a tubular object witha microporous structure. The polyurethane added in the artificial blood vessel can improve the elasticity of the blood vessel under the condition of not damaging the strength of the polyethylene terephthalate material, increase the compliance of the artificial blood vessel and achieve the requirements of clinical use. The polyethylene terephthalate and polyurethane composite artificial blood vessel has the advantages of high strength, large elasticity and compliance, good biocompatibility, strong anticoagulant property and large cell adhesion, and can meet the requirements of the clinical useof the artificial blood vessels with large diameter and small diameter. The preparation process is simple and practical, and applicable to preparing the artificial blood vessels with various different requirements on mechanical properties.

The present invention relates to a process for the production of polyethylene terephthalate copolyester from terephthalic acid, isophthalic acid and ethylene glycol, comprising the steps of: a) preparing a catalyst composition comprising a zinc compound being present such that the elemental zinc content is in a range of about 50 to about 500 ppm, preferably about 200 to about 500 ppm, most preferably about 180 to about 260 ppm, based on the copolyester, b) placing the catalyst composition, terephthalic acid, isophthalic acid and ethylene glycol in a vessel, and c) reacting the terephthalic acid, isophthalic acid and ethylene glycol in an esterification step and a polycondensation step to obtain polyethylene terephthalate copolyester; to the copolyester obtained thereby and its use, as well as to a catalyst composition suitable in the inventive process.

The invention discloses a method for producing ribbon-like filaments through waste PET (polyethylene terephthalate), belonging to the field of high molecular material processing. The method comprises the steps of: tackifying and toughening the waste PET in a reactive extrusion manner, directly extruding ribbon-like filaments through a special filament dividing mould, cooling the ribbon-like filaments, drafting the cooled ribbon-like filaments through a water bath heating drafting method to orientate the ribbon-like filaments, sizing the oriented ribbon-like filaments through an electrical inductance heating roller, cooling the sized ribbon-like filaments through a cooling roller, and coiling the cooled ribbon-like filaments. The prepared PET ribbon-like filaments have properties of good toughness, drafting and the like, the problem that PET ribbon-like filaments are liable to break when being drafted in the production process is effectively solved, and the breaking strength of the produced PET ribbon-like filaments is higher than 50MPa, so that the PET ribbon-like filaments can be applied to the field of production of high-performance woven bags and container bags.

The invention discloses a PET (polyethylene terephthalate) lytic enzyme mutant, a coding gene and application thereof. The PET lytic enzyme mutant is represented by an amino acid sequence SEQ ID NO.8 or SEQ ID NO.9 obtained by performing point mutation on an amino acid sequence SEQ ID NO.7. A lytic enzyme gene of escherichia coli is subjected to directed evolution; by site-specific mutagenesis, the PET lytic enzyme mutant is obtained. According to the amount of decomposition products within the same time, the enzyme activity of the PET lytic enzyme mutant is improved.

The invention relates to a method for preparing diisooctyl terephthalate (DOTP) through catalyzing the alcoholysis of polyethylene terephthalate (PET) by a novel catalyst. The method is characterizedin that a choline eutectic ionic liquid is used as the alcoholysis catalyst, and choline chloride is used as a hydrogen bond donor and a metal salt is used as a hydrogen bond acceptor during the synthesis of the catalyst. Isooctanol is used as a solvent in the reaction process, and the PET is alcoholyzed under the following conditions: a molar ratio of the above raw material to the solvent of 1:2.5 to 1:8, a reaction temperature of 145-185 DEG C, normal pressure and a catalyst using amount being 0.5-10% of the mass of the raw material, for 30-180 min. The method has the advantages of simple preparation of the catalyst, low cost, mild reaction conditions, short reaction time, high efficiency, high PET conversion rate, high selectivity of the target product, and green and environmentally-friendly reaction process.

The invention discloses a high-molecular-weight polyethylene terephthalate-lactic acid copolymer, which is formed mainly by copolymerization of terephthalic acid or dimethyl terephthalate and ethylene glycol and lactic acid, wherein the molar ratio of the terephthalic acid or dimethyl terephthalate to the ethylene glycol is 1:0.5-3; the molar ratio of the terephthalic acid or dimethyl terephthalate to the lactic acid is 1:0.1-2; the weight-average molecular weight of the copolymer is 10,000 to 300,000; the intrinsic viscosity of the copolymer 0.3-2.0dl/g; the glass-transition temperature of the copolymer is 50 to 90 DEG C; and the melting point of the copolymer is 110 to 255 DEG C. The copolymer has a high molecular weight and biodegradability, can be used as an environmentally-friendly novel material or a compatibilizer directly and has a promising application prospect.

The invention belongs to the field of polyethylene terephthalate spinning and relates to a multilobal profiled polyethylene terephthalate fiber FDY (fully-drawn yarn) and a preparation method thereof. Polyethylene terephthalate refers to modified polyethylene terephthalate, and a molecular chain of the modified polyethylene terephthalate consists of a terephthalic acid chain segment, an ethylene glycol chain segment and a rigid structure chain segment, wherein the rigid structure chain segment is 2,6-naphthalic acid segment, a bisphenol A chain segment, a 1,4-cyclohexanedimethanol chain segment, a 2,2-biphenyldicarboxylic acid chain segment, a 4,4-biphenyldicarboxylic acid chain segment or a p-hydroxybenzoic acid chain segment, a molar ratio of the rigid structure chain segment to the terephthalic acid chain segment is 0.02-0.05:1, and a die-swell ratio of a modified polyethylene terephthalate melt is 1.25-1.35. The multilobal profiled polyethylene terephthalate fiber FDY is excellent in shape preserving effect.

The invention discloses a BOPP (biaxially-oriented polypropylene) insulating release film. The BOPP insulating release film comprises BOPP, boron nitride, epoxy resin 6101, phenol-formaldehyde resin 2124, melamine, furfural furfuryl alcohol resin, polyacrylamide, polyamide 66, nano-alumina, mica, talc, poly(vinyl butyral), FEP (fluorinated ethylene propylene), PBT (polybutylece terephthalate), PET (polyethylene terephthalate), methoxypolyethylene glycols, PTFE (polytetrafluoroethylene), polymethylmethacrylate, polyphenylene sulfide, organic montmorillonite, paraffin, polyetheretherketone fiber, nano-silica, an antioxidant 1010, a light stabilizer 622, nano-TiO2, PP-g-MAH (maleic anhydride grafted polypropylene), an antifoaming agent, a thickener and a coupling agent. The BOPP insulating release film has excellent insulation, water resistance, corrosion resistance, temperature resistance, weather resistance, adhesiveness as well as heat dissipation and energy storage functions.

The invention relates to a preparation method of a 1,3-butanediol modified PBTPET (Polybutylece Terephthalate Polyethylene Terephthalate) copolymer fiber. The preparation method is characterized in that raw materials for fiber synthesis comprise terephthalic acid, butanediol, ethylene glycol and 1,3-butanediol; and the combination of p-toluenesulfonic acid and stannous chloride is used as a catalyst. The preparation method comprises the following steps of: (1) carrying out an esterification reaction on the terephthalic acid and dihydric alcohol to form a prepolymer; and (2) carrying out a condensation polymerization reaction on the prepolymer in the presence of high temperature and high vacuum. Compared with a PBT/PET copolymer fiber, the prepared 1,3-butanediol modified copolymer fiber has higher inherent viscosity and lower terminal carboxyl group number, and the dye-uptake of the modified fiber is also obviously improved.

The invention provides a method for depolymerizing a waste polyester bottle, comprising the following steps of: adding the waste polyester bottle, ethylene glycol, sodium bicarbonate and distilled water into a high-temperature and high-pressure reaction kettle according to a certain proportion and reacting at a temperature of 170-200 DEG C for 15-40 minutes to depolymerize the waste polyester bottle into sodium terephthalate, ethylene glycol and other byproducts; then, adsorbing by active carbon and de-coloring; acidifying by hydrochloric acid, and cooling and crystallizing by ice water; filtering, washing and drying to obtain terephthalic acid; and carrying out rotary evaporation on a filtering solution to obtain the ethylene glycol to be repeatedly utilized. According to the method for depolymerizing the waste polyester bottle, by utilizing a mixed reaction system, the depolymerization temperature is reduced, the reaction time is shortened, the energy source consumption is reduced, the equipment investment is reduced, the depolymerization rate of PET (Polyethylene Terephthalate) reaches to be more than 99% and the yield of the target product, namely terephthalic acid, is more than 94%.

The invention relates to the field of chemical fiber. Aiming at the problem of poor dispersibility in the graphene-modified fiber process in the prior art, the invention discloses a preparation methodof a graphene-modified polyethylene terephthalate (PET) blend fiber. The preparation method of the graphene-modified PET blend fiber comprises the following preparation steps of (1) modifying graphene by using a cationic modifier; (2) preparing graphene-modified slices: blending the modified cationic graphene, a modifier and PET slice powder; (3) melting: melting PET slices and the graphene-modified slices; (4) blending: spraying two spinning melts from a composite spinneret so as to form the blend fiber; and (5) carrying out aftertreatment: cooling, oiling, stretching for setting and windingthe blend fiber. Through improving the dispersibility of a graphene slice layer, the uniformity of the graphene in the composite fiber is improved, the graphene-modified PET composite fiber with an excellent performance is obtained, and the fiber has a favorable mechanical property; and through spinning the graphene masterbatch slices and the PET slices through the composite spinneret, the four-leaf clover-shaped composite fiber is prepared.

The invention provides a novel titanium catalyst for polyester and a preparation method thereof. The novel titanium catalyst comprises the following components: titanate, complex ligands with different functionality degrees, a stabilizer, a solvent and a catalyst, wherein the mass percentage of titanium element is 0.1-20%, the molar ratio of difunctional ligands to trifunctional ligands to tetrafunctional ligands is (1-10):(0-5):(0-5), and the molar ratio of titanium atoms to the ligands in the solvent is (4:1)-(1:20). The titanium catalyst prepared by the method has excellent water resistance, and the catalyst can be dissolved in ethylene glycol and then can be conveniently added into a reaction system during industrial production. A polyester product polymerized by the titanium catalystprepared by the method has good color and luster, and is suitable for bottle-grade polyethylene terephthalate (PET) production with high requirements on color and luster.

The invention relates to the field of touch technology, and discloses a display touch device, which includes a display component, a touch component, and an anti-glare film. The anti-glare film is located between the display component and the touch component, wherein the total glare value of the anti-glare film and the display component is between 60 and 80. The above-mentioned anti-glare film may be fogged polyethylene terephthalate, and its thickness is between 100 microns and 300 microns. The invention does not need to greatly change the manufacturing process, and can effectively reduce the reflectivity of the display touch device.

The invention relates to the technical field of preparation of antibacterial film materials, and particularly discloses a composite material capable of slowly releasing antibacterial components, a preparation method thereof and an antibacterial slow-release bag. The preparation method of the composite material capable of slowly releasing the antibacterial component comprises the following steps: S11, mixing a porous adsorption material with antibacterial essential oil to obtain a porous adsorption material adsorbed with the essential oil; and S12, mixing the porous adsorption material adsorbed with the essential oil with the gelatinized starch to obtain the antibacterial slow-release material. The composite material capable of slowly releasing the antibacterial component prepared by the method can continuously release the essential oil antibacterial component for more than 4 months, and in the best embodiment, the continuous release time of the essential oil antibacterial component reaches 9 months. Furthermore, the composite material capable of slowly releasing the antibacterial components is wrapped in a breathable film bag made of PET (polyethylene terephthalate), PE (polyethylene), PA (polyamide) or PP (polypropylene) to prepare the antibacterial slow-release bag, and the antibacterial slow-release bag can be widely applied to various environments needing antibiosis.

The invention discloses an application of an ionic liquid in polyethylene terephthalate composite fiber. The ionic liquid is taken as an antibiotic additive and applied to the polyethylene terephthalate composite fiber. The polyethylene terephthalate composite fiber with the added ionic liquid shows excellent inhibitory and bactericidal characteristics to staphylococcus aureus of gram-positive bacterium and escherichia coli of Gram-negative bacterium respectively. An antimicrobic polyethylene terephthalate composite fiber thin film provided by the invention can be applied to the fields of medical science, biology, environmental protection, spinning and the like.

The invention discloses an antibacterial chitosan-based hemostatic patch, which comprises a back lining layer, a hemostatic layer and a protective layer which are sequentially arranged from bottom to top; the back lining layer is a base material prepared from polypropylene or polyethylene terephthalate, and an adhesive is coated on the back lining layer; the hemostatic layer comprises a non-woven fabric on the lower side and a composite hemostatic material on the upper side, and the composite hemostatic material is composite hydrogel prepared from modified chitosan, polyethylene glycol 2000, gelatin, xanthan gum, a tea polysaccharide-nano-selenium compound, dopamine modified nano-silica and oleamide; and the protective layer is a PET (Polyethylene Terephthalate) film. The antibacterial chitosan-based hemostatic patch provided by the invention is convenient to store, carry and use, does not stimulate wounds, has good antibacterial and anti-infection effects, can realize rapid blood coagulation through adhesion sealing and activation of a blood coagulation system, and can avoid the occurrence of side effects of vascular embolism.

The invention relates to 68Ga-NODAGA-cyclic polypeptide FG01 of a targeted EphA2 receptor as well as a preparation method and application of the 68Ga-NODAGA-cyclic polypeptide FG01. The 68Ga-NODAGA-cyclic polypeptide FG01 forms an amido bond through an amino group of lysine in an amino acid sequence and a carboxyl group of serine, then an amino group at an amino terminal of the cyclic polypeptide FG01 and a coupling agent NODAGA-NHS are subjected to a condensation reaction, a chelating agent NODAGA in the cyclic polypeptide conjugate NODAGA-FG01 is chelated with 68Ga, and the 68Ga-labeled cyclic polypeptide conjugate is constructed. The invention verifies that the annular polypeptide FG01 has no obvious inhibition effect on tumor cells, indicates that the annular polypeptide FG01 has no cytotoxicity, and finds that the 68Ga-NODAGA-annular polypeptide FG01 of a targeted EphA2 receptor can be used for in-vivo imaging of EphA2 high-expression tumors, realizes molecular imaging of the EphA2 high-expression tumors such as non-small cell lung cancer by utilizing PET (Polyethylene Terephthalate), and is widely used as a tumor molecular imaging agent.

The invention discloses a method for catalyzing alcoholysis of waste PET (polyethylene terephthalate) ethylene glycol by using heteroatom-doped zinc oxide, which is characterized in that metal heteroatom-doped two-dimensional defect-rich zinc oxide is used as a catalyst, ethylene glycol is used as a solvent, and the alcoholysis of the waste PET is catalyzed. Under the conditions that the dosage of the catalyst is 0.1%-10% of the mass of PET, the reaction temperature is 140-190 DEG C, the reaction time is 15-180 minutes, and the mass ratio of ethylene glycol to PET is 1: 4, the yield of BHET is 54.5%-94.5%. The method has the characteristics that the catalyst is easy to recover and can be recycled, the reaction process is pollution-free, the reaction condition is mild and the like, the degradation product does not need to be decolored and has low requirements on raw materials, and the alcoholysis product is easy to separate and purify.

The invention relates to the technical field of radiopharmaceutical chemistry and clinical nuclear medicine, in particular to a PD-L1 targeting polypeptide PET molecular imaging probe and a preparation method and application thereof. The < 18 > F-AlF-NOTA-PA2881 probe is an annular polypeptide PET (Polyethylene Terephthalate) molecular imaging probe composed of ten amino acids based on Cyclopetide 66, and is formed by connecting a bifunctional chelating agent to lysine in cyclic peptide and then labeling with radionuclide < 18 > F. The invention also discloses a preparation method of the < 18 > F-AlF-NOTA-PA2881 probe. And by adopting the short-half-life radionuclide 18F marker, the tumor focus can be quickly and accurately identified. Compared with the existing mainstream monoclonal antibody imaging probe, the molecular imaging probe has the advantages that the metabolism is rapid, and the potential influence of radionuclides and monoclonal antibodies on organisms is further reduced. By means of in-vitro imaging equipment PET, the expression level of tumor cells PD-L1 can be reflected, the immunotherapy curative effect aiming at the signal channel can be predicted, real-time curative effect detection, prognosis evaluation and the like can be achieved. The in-vivo targeting performance of the probe is excellent.