185 results about "PEG-terephthalate" patented technology

The invention discloses a method for efficiently depolymerizing polyethylene glycol terephthalate, which comprises the following steps: mixing a PET material, ethylene glycol and a core-shell type magnetic nano composite catalyst, and carrying out alcoholysis reaction at 160-200 DEG C for 30-180 minutes; after the reaction is finished, separating the catalyst from a reaction system through an external magnetic field to obtain a solution containing bis (2-hydroxyethyl) terephthalate; the core-shell type magnetic nano composite catalyst comprises a magnetic FeO core, a SiO shell layer and active metal sites, the FeO core is coated with the SiO shell layer, the SiO shell layer is an insulating inorganic layer and is of a porous structure, the active metal sites are fixed to the surface of the SiO shell layer through coordinate bonds, and active metal is selected from one or more of Co, Ni, Cu, Ce, La and Al. The problems that an existing PET alcoholysis catalyst is easy to dissolve out, difficult to separate, harsh in reaction condition and poor in cycling stability are solved.

The invention provides a low-molecular soluble chelating collector as well as a preparation method and application thereof, and belongs to the technical field of mineral processing. According to the collecting agent, low-molecular-weight ethylene glycol terephthalate serves as a precursor, and isosorbide is introduced for a copolymerization reaction; glutamic acid is introduced as a branched chain unit, and the branching degree and reaction active site density of the molecular structure are remarkably improved by utilizing the polyfunctional group characteristic of glutamic acid. A rigid ring structure and an ether bond of the isosorbide endow the medicament with good water solubility and dispersity, and invalid curling of a macromolecular chain is avoided; the introduction of glutamic acid branched chains greatly increases the number of hydroxyl groups and amino groups capable of reacting with carbon disulfide, so that each molecule carries more xanthate groups, and the adsorption stability and coverage density of the molecule on the surface of arsenopyrite are enhanced. By means of the structure, xanthate functional groups are fully exposed, multi-tooth chelation is easily conducted on the xanthate functional groups and iron and arsenic ions on the surface of arsenopyrite, a strong hydrophobic surface layer is formed, and therefore the collecting selectivity is remarkably improved.

The application discloses a medical natural antibacterial and antiviral mildew-proof wet non-woven fabric and a preparation method and application thereof, and belongs to the technical field of medical polymer materials and textiles. The non-woven fabric is prepared from the following raw materials: polyethylene terephthalate long fibers, polyethylene terephthalate short fibers, vinylon fibers and natural antibacterial and antiviral ultraviolet slow-release glue solution. The non-woven fabric is endowed with natural and non-toxic antibacterial and antiviral effects by using the extract of Chinese herbal medicine effective components. Meanwhile, the mechanical properties and the antibacterial and antiviral capacity of the non-woven fabric can be effectively improved by adding nano materials with far infrared function after surface modification to prepare high-efficiency natural antibacterial and antiviral ultraviolet slow-release microcapsule glue solution. The method improves the added value and application field of the wet non-woven fabric and is convenient for large-scale processing and production. The prepared wet non-woven fabric has excellent performance indexes, good air permeability and an antibacterial and antiviral efficiency of 99.99%.

The invention relates to the technical field of furniture protective films, in particular to a self-adhesive furniture skin-touch protective film which sequentially comprises an organic silicon release film from bottom to top, the organic silicon release film comprises a base material and a coating, the base material is a transparent polyethylene glycol terephthalate film with the thickness of 80-120 micrometers, and the coating is a transparent polyethylene glycol terephthalate film with the thickness of 80-120 micrometers. The coating is an organic silicon release agent coated on the base material, and the coating weight of the organic silicon release agent is 0.8-1.2 g / m; the pressure-sensitive adhesive layer comprises 60 to 70 weight percent of a compound system of a saturated hydrocarbon block copolymer and a hydrogenated styrene isoprene styrene block copolymer; 25 to 35 wt% of hydrogenated C9 petroleum resin; 3 to 5 weight percent of temperature-sensitive microcapsules; and 2 to 5 wt% of naphthenic oil. According to the invention, through the cooperation of innovative multi-layer structures, the product can maintain excellent comprehensive performance under different parameter configurations, and multiple requirements of the furniture protective film on easy construction, high transparency, strong protection, good touch feeling and aging resistance are met.

The invention belongs to the technical field of textile, and particularly discloses a porous polyester fiber and a preparation method thereof.The preparation method comprises the following steps that S1, coffee charcoal powder, bamboo charcoal powder and coconut shell charcoal powder are mixed according to the mass ratio of 1: (0.5-2): (0.1-1) to serve as an antibacterial agent; s2, mixing the antibacterial agent, polyethylene glycol terephthalate and a water-soluble polymer to obtain a blend; s3, the blend is sliced, granulated and subjected to melt spinning, and the polyester fiber is prepared; and S4, washing the polyester fiber with alcohol at room temperature, washing with hot water, and drying to obtain the porous antibacterial polyester fiber. Coffee charcoal powder, bamboo charcoal powder and coconut shell charcoal powder are compounded to form an antibacterial agent, then the antibacterial agent is mixed with polyethylene glycol terephthalate and a water-soluble polymer, slicing granulation and melt spinning are conducted, then the water-soluble polymer is dissolved out through alcohol washing and hot water washing, and the polyester fiber with the antibacterial function and the porous structure is obtained.

The invention discloses polyethylene glycol terephthalate hydrolase PmPETase and application thereof.The hydrolase PmPETase is protein with the amino acid sequence shown in SEQ ID NO.1. An expression system suitable for the PmPETase is constructed, recombinase protein with catalytic activity is obtained, and the polyethylene glycol terephthalate hydrolase PmPETase can be used for preparing the polyethylene glycol terephthalate hydrolase PmPETase. The substrate specificity, the catalytic property and the potential plastic degradation capacity of the PET degrading enzyme are comprehensively analyzed, and a new theoretical basis and application reference are provided for development and utilization of the PET degrading enzyme and a high polymer material green treatment technology.

The present application relates to a kind of polyethylene terephthalate foamed materials and its preparation method, the preparation method includes the following steps: polyethylene terephthalate 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;And the sheet material is treated with foaming, and polyethylene terephthalate foamed material is obtained.The present application uses melt isothermal crystallization treatment, can improve the melt strength in the foaming process of polyethylene terephthalate, 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 can obtain the polyethylene terephthalate foamed material of bubble size uniform and controllable foaming ratio.

The invention provides a polymer floor and a preparation method thereof. The floor sequentially comprises a first outer layer, a first buffer layer, a first bonding layer, a base material layer, a second bonding layer, a second buffer layer and a second outer layer from top to bottom, wherein the base material layer is made of a first polymer, and the first polymer is selected from one or a mixture of more of PVC (polyvinyl chloride), PET (polyethylene glycol terephthalate), PETG (polyethylene glycol terephthalate) and TPU (thermoplastic polyurethane); wherein the first buffer layer and the second buffer layer are respectively and independently selected from one or more of non-woven fabrics and glass fiber mats; wherein the first bonding layer and the second bonding layer are blended membranes of grafted resin and a second polymer, and the second polymer is selected from one or a mixture of more of TPU (thermoplastic polyurethane), EAA (ethylene-acrylic acid copolymer) and PETG (polyethylene terephthalate glycol); wherein the first outer layer and the second outer layer are impregnated with glue.

The invention discloses a method for preparing an aromatic phosphate salt nucleating agent by using nanoscale aluminum chloride, and belongs to the technical field of polymer nucleating agents. 2, 2-methylene-bis (4, 6-di-tert-butylphenol) and phosphorus oxychloride are used as raw materials, the nanoscale aluminum chloride with the particle size of 20-50nm is selected as an inorganic Lewis acid catalyst and acid binding agent, and the aromatic phosphate salt nucleating agent is prepared by using a one-step method. The preparation method comprises the following steps: replacing the traditional organic acid-binding agents such as triethylamine and pyridine, and synthesizing bis [2, 2 '-methylene bis (4, 6-di-tert-butylphenoxy) phosphate] hydroxyl sodium salt by a one-pot method of condensation, hydrolysis for salt removal and neutralization for salt formation; the purity of the product can reach 99% or above through one-time suction filtration, multiple times of washing are not needed, salt-containing wastewater can be recycled as industrial water after being neutralized, and the environmental protection pressure is greatly reduced; the nucleating agent is suitable for modification processing of polymers such as polypropylene (PP), polyethylene glycol terephthalate (PET), polybutylene terephthalate (PBT), polyamide (PA) and the like, and especially meets the strict requirements on the purity and environmental protection property of the nucleating agent in an olefin polymerization process.

A method for converting post-consumer recycled (PCR) flakes of polyethylene terephthalate (PET) to pellets as part of a container recycling procedure, the method including: adding triphenyl phosphite antioxidant to a reactor at a concentration of 0.05 wt.% to 0.15 wt.%; coating the PCR flakes with the triphenyl phosphite in the reactor; and converting the PCR flakes to the pellets in an extruder after coating the PCR flakes with the triphenyl phosphite to reduce yellowing of the pellets during the conversion.

An optically anisotropic polymer thin film includes a crystallizable polymer and an additive configured to interact with the polymer (e.g., via π-π interactions) to facilitate chain alignment and, in some examples, create a higher crystalline content within the polymer thin film. The polymer thin film may be characterized by a bimodal molecular weight distribution where the molecular weight of the additive may be less than approximately 50% of the molecular weight of the crystallizable polymer. Example crystallizable polymers include polyethylene naphthalate, polyethylene terephthalate, polybutylene naphthalate, polybutylene terephthalate, as well as derivatives thereof. Example additives, which may occupy up to approximately 10 wt. % of the polymer thin film, include aromatic ester oligomers, aromatic amide oligomers, and polycyclic aromatic hydrocarbons, for example. The optically anisotropic polymer thin film may be characterized by a refractive index greater than approximately 1.7 and an in-plane birefringence greater than approximately 0.2.

The application discloses a method for recycling polyester fabric by using an ionic liquid catalyst, and comprises the following steps: providing a recycled polyester fabric; chemically depolymerizing the recycled polyester fabric by using a chemical depolymerization solution to form a depolymerization product containing bis-hydroxyethyl terephthalate (BHET), wherein the chemical depolymerization solution is used to chemically depolymerize the recycled polyester fabric in the presence of a depolymerization catalyst, and the depolymerization catalyst is an ionic liquid catalyst. The method has the advantages of high depolymerization efficiency, high BHET yield and easy recovery of the catalyst.

The present application discloses a kind of polyethylene terephthalate mixture and its preparation method and application, the polyethylene terephthalate mixture includes the following components: polyethylene terephthalate resin 45-86 parts by weight, toughening agent 0-10 parts by weight, reinforcing agent 10-50 parts by weight, nucleating agent 0.7-10 parts by weight, processing aid 0-3 parts by weight.The nucleating agent includes the combination of long-chain linear saturated lignosulfonate, talcum powder and polyethylene.The forming property of the polyethylene terephthalate mixture of the present application is further improved, the forming cycle is greatly shortened, the mechanical strength, toughness and heat distortion temperature can be maintained relatively high, the application range is further expanded, not limited by color, and can be applied to full-color products.

Provided is a heat-shrinkable polyester film that not only has a high heat shrinkage in the main shrinkage direction, but also has a good heat shrinkability of recycled PET resin even when recycled together with used beverage PET bottles. A heat-shrinkable polyester film containing, in 100 mol% of a dicarboxylic acid component, 95 mol% or more and 100 mol% or less of a dicarboxylic acid, 0 mol% or more and 5 mol% of isophthalic acid, and containing, in 100 mol% of all ester units, 85 mol% or more and 98 mol% or less of terephthalic acid ethylene glycol ester units, and containing, in 100 mol% of a polyol component, 2 mol% or more and 15 mol% or less of diethylene glycol, has a prescribed hot water heat shrinkage, and has a melting peak temperature, a crystallization exotherm, and a melting exotherm determined by melting the film after melting and quenching using a differential scanning calorimeter (DSC), and then re-warming, within prescribed ranges.

One aspect is a method for producing a first intermediate product. A feedstock is provided that comprises a first polyester. The feedstock is separated into a least a first feedstock amount and a further feedstock amount. The first feedstock amount and the further feedstock amount comprise the first polyester.The first feedstock amount is transported into a first reaction line, and the further feedstock amount is transported into a further reaction line.In a reaction line the first polyester is contacted with a further amount of a first organic compound, a weight average molar mass of the first polyester is reduced;the first polyester is contacted with a further organic compound to obtain a further initial mixture;a weight average molar mass of the first polyester is reduced to obtain a first intermediate mixture. The first intermediate mixture comprisesa first intermediate product andthe further organic compound.At least one process parameter varies by at least 10%, between the first reaction line and the further reaction line.

The application discloses a kind of multistage synergic covalent grafting type hydrolysis-resistant self-cleaning PET submarine cable monofilament and preparation method, the monofilament includes three parts of core layer, skin layer and surface layer, the core layer is the high viscosity polyethylene terephthalate resin containing carbodiimide anti-hydrolysis agent;Skin layer is the modified PET resin of functional polysiloxane covalent grafting, wherein the functional polysiloxane has epoxy end group or isocyanate end group, and main chain has Si-H group;Surface layer is the fluorine-free low surface energy layer formed by polyvinyl long side chain alkane polysiloxane and residual Si-H group in skin layer through hydrosilylation reaction.The application significantly improves the durability of monofilament in humid heat environment, so that it is suitable for long-term humid heat service environment such as marine cable and industrial fabric, and can maintain stable mechanical strength and self-cleaning performance for a long time.

The present invention relates to a method for depolymerizing polyester fillings containing opaque PET, comprising: a) a conditioning step; b) a glycolysis step carried out in the presence of a diol at 180-400°C with a residence time of 0.1-10 hours; c) a step of separating the diol at a temperature of 100-250°C and at a pressure lower than that of step b) to produce a diol effluent and a monomer-rich effluent; d) a step of separating the monomer-rich effluent into a heavy impurities effluent and a pre-purified monomer effluent at a temperature below 250°C and a pressure below 0.001 MPa with a residence time of less than 10 minutes; and e) a step of decolorizing the pre-purified monomer effluent by adsorbing a mixture comprising 20-90 wt. % of the pre-purified monomer effluent and a solvent in the presence of at least one adsorbent at a temperature of 100-200°C and a pressure of 0.1-1.0 MPa.

The present disclosure relates to a process for the depolymerization of polyethylene terephthalate (PET). The process of the present disclosure is performed without using any catalyst or ionic liquids. Further, the reagents used in the process can be recovered and reused.

The present invention relates to a high-strength polyethylene terephthalate yarn and tire cord having improved heat resistance. The polyethylene terephthalate tire cord according to the present invention has excellent physical properties even under high-temperature conditions, and maintains a high strength retention rate at high temperatures relative to room temperature, thereby achieving high heat resistance. Accordingly, a decrease in cord strength at high temperatures during molding is alleviated, thus making it possible to reduce tire weight. In addition, degradation of physical properties caused by an increase in tire temperature during high-speed driving of a vehicle is minimized, thereby reducing tire rolling resistance, improving handling performance, and enhancing vehicle fuel efficiency.

The invention provides a printed circuit board and a manufacturing method thereof. The manufacturing method of the printed circuit board comprises the following steps: providing a polyimide, polyethylene glycol terephthalate or glass fiber combined epoxy resin substrate; forming a conductive ink layer on the substrate; a low resistance material layer is formed on the conductive ink layer. Particularly, the resistance of the low-resistance material layer is smaller than that of the conductive ink layer.

The present application relates to the technical field of new thermal insulation material testing, in particular to a kind of nanofiber thermal insulation cotton and its testing device, thermal insulation cotton includes the following components: polypropylene, polyethylene terephthalate, EVA hot melt adhesive and decalin;Thermal insulation cotton testing device includes rack and transposition disc installed on the top of rack, the top middle part of rack is fixedly arranged with U-shaped support, detection drive assembly is arranged on both sides of U-shaped support, the position of two detection drive assemblies on the top of transposition disc is respectively provided with heat conductivity test component and pressure test component, linkage is carried out between two detection drive assemblies, heat conductivity test component and pressure test component are respectively with the detection drive assembly of corresponding position constitute heat conductivity detection mechanism and pressure detection mechanism;The present application can carry out pressure test and heat conductivity test simultaneously, and the prepared thermal insulation cotton has the characteristics of low density, special structure and high resilience.

A foamed polymer composition includes a matrix polymer component, and from 0.01 wt % to 2 wt %, based on the weight of the polymer composition, of a nanostructured fluoropolymer, a nanostructured fluoropolymer encapsulated by an encapsulating polymer, or a combination thereof. The matrix polymer component includes polybutylene terephthalate (PBT), polyetherimide (PEI), polyethylene terephthalate (PET), polycarbonate (PC), poly(p-phenylene oxide) (PPO), polystyrene (PS), polyphenylene sulfide (PPS), polypropylene (PP), polyamide (PA), polytrimethylene terephthalate (PTT), polyethylene naphthalate (PEN), polybutylene naphthalate (PBN), copolymers thereof, or a combination thereof. Methods for forming foamed polymer compositions, including core-back molding methods and extrusion foaming methods, are also described.

This invention discloses an alkaline, phosphorus-free nano-chelating agent, which, by weight percentage, is composed of the following components: 30%–40% sodium hydroxide, 6%–15% polyethylene terephthalate, 5%–10% polyglutamic acid, 1%–5% polysuccinimide, 11%–18% ammonium citrate, 2%–9% nano-silica, 2%–9% nano-alumina, and the balance being water. This phosphorus-free nano-chelating agent contains no phosphorus and will not cause phosphorus pollution during use. Compared to traditional phosphorus-containing chemicals, it is more environmentally friendly and helps reduce phosphorus content in water bodies, thereby mitigating environmental problems such as eutrophication.

The present invention provides a secondary barrier for liquefied gas storage tank, characterized by comprising: a blocking layer containing (a) metal or (b) one or more polymers selected from the group consisting of polyethylene, polyethylene terephthalate, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, and nylon; and a fiber layer laminated on both sides of the blocking layer, containing one or more fibers selected from the group consisting of glass fiber, polyethylene fiber, poly-p-phenylene benzobisoxazole fiber (PBO), aramid fiber, and carbon fiber, the fiber layer being fixed by an adhesive layer suitable for surface properties.

The invention relates to a high-performance composite fiber and a warm-keeping and moisture-absorbing fabric made of the high-performance composite fiber, and belongs to the technical field of fabric manufacturing. The high-performance composite fiber is prepared from a raw material spinning solution through wet spinning, and the raw material spinning solution is prepared by mixing a solvent, polyethylene glycol terephthalate, modified cationic polyacrylamide and long alkyl chain modified graphene. According to the invention, by introducing the modified cationic polyacrylamide, the composite fiber obtained by spinning has good hygroscopicity, antistatic property and antibacterial property, and by introducing the long alkyl chain modified graphene, the cohesive property of the polyethylene glycol terephthalate and the modified cationic polyacrylamide is further improved; due to the existence of the long alkyl chain modified graphene, the intersticity and the diameter of the internal structure of the obtained composite fiber are increased, and the air permeability of the composite fiber is improved.

The present invention relates to a thermoplastic composition comprising: from about 20 wt% to about 65 wt% of a resin component comprising polybutylene terephthalate (PBT), poly (cyclohexyldimethylene terephthalate) (PCT), polyethylene terephthalate (PET), or a combination thereof; from about 10 wt% to about 30 wt% of a polyestercarbonate copolymer, the polyestercarbonate copolymer including resorcinol units; from about 5 wt% to about 50 wt% of a glass fiber component, the glass fiber component comprising regenerated round glass fibers; and from about 5 wt% to about 10 wt% of at least one additive component. The composition has a higher nanomolding technology (NMT) bond strength than a comparative composition that includes flat glass fibers rather than the regenerated round glass fibers. The dielectric constant (Dk) of the composition is at least 3.3, as evaluated at 2.5 gigahertz (GHz) or 5.0 GHz according to the SPDR method, or at least 3.24, as evaluated at 60 GHz according to the coaxial method.

The application designs and synthesizes a nucleating agent with good compatibility with recycled polyethylene terephthalate. The nucleating agent can effectively solve the technical problems of slow crystallization rate and poor heat resistance of recycled polyethylene terephthalate. The nucleating agent is simple to synthesize, has good effect, can effectively improve the crystallization temperature, crystallization rate and heat distortion temperature of recycled polyethylene terephthalate, and further promotes the wide application of recycled polyethylene terephthalate.

Provided is an inexpensive, low-environmental-burden laminated metal sheet and laminated metallic container that have basic properties such as formability, adhesion between the film and the metal sheet, and corrosion resistance, and that do not suffer from degradation in appearance due to whitening even when subjected to retort sterilization treatment. The laminated metal sheet 10 has a first film 31 laminated on at least one of a front surface 21 or a back surface 22 of a metal sheet 20. The first film 31 is homopolyethylene terephthalate or copolymer polyethylene terephthalate, and w(x) obtained by a linearly polarized laser Raman spectroscopic analysis for a cross section of the first film 31 satisfies the following expressions (1) and (2):w1730ID(1.)≤20⁢ cm-1 (1)w1730ND(1.)≤20⁢ cm-1.(2)

Provided is a method of collective treatment of organic wastewater discharged in processes of manufacturing purified terephthalic acid (PTA) and dimethyl terephthalate (DMT) which are raw materials for polyethylene terephthalate (PET). The inventors found that collective anaerobic biological wastewater treatment of PTA manufacturing wastewater and DMT manufacturing wastewater enables both the wastewaters to be collectively treated with efficiency more than the conventional efficiency of treatment of PTA manufacturing wastewater. The present invention was thus accomplished.

Air filter (1), comprising: a nonwoven filter paper (10) configured to have air permeability and to filter foreign substances in polluted air passing through the air filter (1), wherein the nonwoven filter paper (10) comprises a pleated section (10-1...10-N) pleated at predetermined intervals, and the pleated section (10-1...10-N) comprises a dense layer (15, 17) comprising a first polyethylene terephthalate (PET) fiber (20-2) and a second polyethylene terephthalate (PET) fiber (20-1), wherein under heat treatment the first PET fiber (20-2) exhibits greater shrinkage than the second PET fiber and the second PET fiber (20-1) is deformed, wherein the polluted air passing through the air filter is converted into fresh air, wherein the second PET fiber (20-1) has a diameter of 15 µm and the content of the first PET fiber is 5 up to 20 kg.-% based on the total weight of the dense layer (15, 17), wherein the dense layer (15, 17) has an inner dense layer (15) comprising a second PET fiber (20-1) and an outer dense layer (17) comprising a first PET fiber (20-2) in contact with the second PET fiber (20-1), wherein by applying hot air to the second PET fiber (20-1) and the first PET fiber (20-2) the first PET fiber (20-2) has shrunk more than the inner dense layer (15) and the first PET fiber (20-2) is bonded to the second PET fiber (20-1) to form the outer dense layer (17), wherein the predetermined intervals of the pleated part (10-1...10-N) are uniform throughout the entire part of a front end (10A) that is an end part of the thermally bonded nonwoven filter paper (10) and a rear end (10B), which is an end part of the other side, and wherein the regular intervals form the fold part (10-1...10-N) as a ""-shaped, rigid skeleton (10D) by forming a shoulder-adapted structure.