439 results about "PEG-terephthalate" patented technology

The invention relates to the technical field of chemical degradation of waste polyester, and discloses a titanium-silicon compound catalyst, a preparation method thereof and a method for depolymerizing polyethylene glycol terephthalate. The preparation method of the titanium-silicon compound catalyst comprises the following steps: (1) preparing a titanium compound, an orthosilicate compound and a solvent, and reacting with an organic acid solution to obtain a solution; and (2) carrying out post-treatment on the solution to obtain the titanium-silicon compound catalyst. The catalyst has the characteristics of high PET depolymerization rate, low polymerization degree in a depolymerization product, high purity of a depolymerization product bis (2-hydroxyethyl) terephthalate (BHET) and low titanium residue in a target product in a PET degradation reaction. The BHET obtained by the method disclosed by the invention can be directly used for preparing PET polyester products or other high-added-value products, and closed-loop cyclic utilization of PET is realized.

The invention relates to the technical field of fibers, and discloses an ultrahigh-moisture-absorption anti-static polyester fiber and a preparation method thereof. The preparation method comprises the following steps: carrying out nucleophilic substitution reaction on 1, 2-benzisothiazolin-3-one and methacryloyl chloride to obtain modified benzisothiazolinone; the preparation method comprises the following steps: carrying out nucleophilic substitution reaction on phosphonitrilic chloride trimer and allylamine, and then carrying out nucleophilic substitution reaction on the phosphonitrilic chloride trimer and melamine again to obtain modified cyclophosphazene; the preparation method comprises the following steps: mixing gamma-methacryloxypropyltrimethoxysilane with aluminum zinc oxide for reaction, and mixing the obtained modified aluminum zinc oxide with modified benzisothiazolinone and modified cyclophosphazene for copolymerization in the presence of an initiator to obtain a flame-retardant antibacterial additive; mixing the flame-retardant antibacterial additive, calcium carbonate and polyethylene glycol terephthalate, performing melt spinning, and performing acid treatment to obtain modified polyester fibers; dipping the modified polyester fiber in a finishing liquid containing modified chitosan to obtain the ultrahigh-moisture-absorption anti-static polyester fiber.

The invention relates to a production process of a high-elasticity heat-resistant polyester yarn, which comprises the following steps: firstly, selecting high-molecular-weight polyethylene glycol terephthalate, adding 1-3% of nano filler and 5-10% of functional copolymer, and drying at 150 DEG C for 4-6 hours to improve the stability and processability of the material; secondly, melt extrusion is conducted at 280-290 DEG C, spinning is conducted through a multi-section temperature control spinning head, and the fiber cooling uniformity is effectively controlled. Then, two times of drafting and a heat setting process are adopted, the orientation degree of a molecular chain is improved in one time of drafting, and low-temperature plasma treatment is combined to optimize the surface activity and the setting effect of the fibers. In the secondary drafting, the fiber deformation is finely adjusted at low temperature, the thermal damage is reduced, the elasticity is improved, and finally, xylanase treatment and ultraviolet curing are combined, so that the softness, the skin-friendly property and the weather resistance of the fiber are remarkably improved.

The invention discloses a recycling method of polyethylene glycol terephthalate (PET). According to the method, organic acid is used as a catalyst for hydrolysis of PET, the organic acid is selected from one or more of adipic acid, lactic acid and glycollic acid, and then hydrolysis products are directly polymerized with additional monomers and polymerization catalysts to prepare the biodegradable copolyester without any separation treatment step. The prepared copolyester has biodegradability, so that the non-degradable PET is converted into the biodegradable copolyester by the recycling method, and the recycling method has important significance for relieving the problem of environmental pollution.

The invention relates to the technical field of automobile interior and exterior composite material preparation, in particular to a full-structure recyclable polyethylene glycol terephthalate filament felt and a preparation method and application thereof. The method comprises the following steps: spinning by taking low-melting-point modified PET as a skin layer and unmodified PET as a core layer to obtain a PET filament with a skin-core structure; carrying out web forming and heat treatment to obtain a PET long fiber web; needling the PET long fiber net to obtain a PET filament felt; the PET filament felt can be used for preparing an automobile interior and exterior composite material through a mold pressing process. The full-structure recoverable PET filament felt provided by the invention is remarkably improved in the aspects of preparation process and recoverability, and an automobile interior and exterior composite material prepared from the full-structure recoverable PET filament felt also has outstanding performance in the aspects of light weight, NVH (Noise Vibration and Harshness) resistance and cost effectiveness, so that the comprehensive performance of the automobile interior and exterior composite material is favorably improved.

A polyethylene terephthalate aerogel. There is provided a polyethylene terephthalate (PET) aerogel comprising a porous network of cross-linked recycled PET fibers, wherein the PET aerogel has a thermal conductivity of 0.030-0.050 W / m K. There is also provided a method of forming the PET aerogel.

The invention provides a synthesis method of bio-based poly (ethylene 2, 5-furandicarboxylate) (poly (ethylene 2, 5-furandicarboxylate) for short) and performance application of the bio-based poly (ethylene 2, 5-furandicarboxylate). According to the method, 2, 5-furandicarboxylic acid (FDCA) derived from renewable resources and ethylene glycol (EG) are used as main raw materials, and the high-molecular-weight PEF is prepared through microwave-assisted esterification-polycondensation reaction under the action of a metal catalyst. The prepared PEF has excellent thermal mechanical property and gas barrier property, the glass transition temperature is about 58.6 DEG C, the melting temperature is about 187.4 DEG C, and the thermal decomposition 18% weight loss temperature exceeds 400 DEG C. The PEF material can be biologically degraded under the industrial composting condition, and the degradation speed is higher compared with that of traditional petroleum-based PET polyester. The PEF provided by the invention is suitable for the fields of food packaging films, beverage bottles and fiber materials, has the advantages of biodegradability, heat resistance stability and high barrier property, can partially replace polyethylene glycol terephthalate (PET) and other petrochemical plastics, and meets the requirements of sustainable development.

The invention provides a method for alcoholysis of polyethylene glycol terephthalate, and relates to the technical field of PET degradation. The PET alcoholysis method provided by the invention comprises the following steps: mixing PET, ethylene glycol, a cosolvent and a composite catalyst, and carrying out alcoholysis reaction to obtain bis (hydroxyethyl) terephthalate (BHET). According to the invention, dimethyl sulfoxide is taken as a cosolvent, zinc acetate and 1, 8-diazabicyclo [5.4. 0] undec-7-ene are taken as a composite catalyst, catalysis and solvent effect driving are combined, and ethylene glycol alcoholysis of PET is carried out under the synergistic effect of the composite catalyst and the cosolvent. According to the method, effective decomposition of PET can be achieved at the low temperature (140-155 DEG C) and within the short reaction time (60-100 min), and the yield of BHET is high (66% or above and can reach 80% or above). The method provided by the invention can realize high-efficiency alcoholysis of PET with ethylene glycol.

The invention discloses an efficient defluorination agent suitable for photovoltaic wastewater and a preparation process thereof, and particularly relates to the field of photovoltaic wastewater treatment.The efficient defluorination agent comprises an outer-layer polymerization barrier and an inner-core drug release barrier, the outer-layer polymerization barrier wraps the outer portion of the inner-core drug release barrier, a first drug release area is formed between the outer-layer polymerization barrier and the inner-core drug release barrier, and a second drug release area is formed between the outer-layer polymerization barrier and the inner-core drug release barrier; an inner cavity of the inner core drug release barrier is a drug release area II; the outer-layer polymerization barrier comprises polyvinylidene fluoride, polyethylene glycol terephthalate and chitosan, and the outer-layer polymerization barrier is dissolved under the action of current or ultraviolet rays. By designing the structures of the outer-layer polymerization barrier and the inner-core drug release barrier, the function of gradually releasing the drug in a specific environment is realized, the outer-layer polymerization barrier is dissolved under the action of current or ultraviolet rays, and the inner-core drug release barrier is gradually hydrolyzed in an alkaline environment, so that the action time and effect of the drug are optimized; and the problem of unstable efficiency caused by too fast release in the traditional defluorination agent is avoided.

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 invention discloses a polyester film for a blue adhesive tape, which is used for binding and packaging a battery of a new energy electric vehicle. The polyester film is prepared from 70-85 parts by weight of high-viscosity polyethylene glycol terephthalate, 5-12 parts by weight of thermoplastic polyurethane, 2-4 parts by weight of siloxane resin powder, 1-3 parts by weight of melamine cyanurate, 2-5 parts by weight of organic modified montmorillonite, 1-3 parts by weight of a coupling agent and 1-3 parts by weight of a coupling agent. 1-3 parts by weight of aromatic polyimide micro powder and 0.3-0.5 part by weight of ethylene glycol monostearate. The invention also discloses a preparation method of the polyester film. The polyester film for the blue adhesive tape is excellent in dielectric strength, flexibility, puncture resistance and flame retardance, the characteristics directly correspond to strict requirements of automobile lithium battery shell packaging, and comprehensive guarantee is provided for safety, reliability and environmental adaptability.

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 provides a polyester fabric recycling method. The polyester fabric recycling method comprises the following steps. A polyester fabric including polyethylene terephthalate and a dye is provided. The dye is removed from the polyester fabric through an extraction technology, and the extraction technology comprises the steps that ethylene glycol serves as an extraction solvent, the polyester fabric is soaked in the extraction solvent, and extraction is conducted at the temperature of 80 DEG C to 180 DEG C. A depolymerization process is performed comprising depolymerizing the extracted polyester fabric with a chemical depolymerization liquid to obtain a product comprising ethylene terephthalate (BHET), where the chemical depolymerization liquid is ethylene glycol. And performing a purification process to remove impurities from the product obtained by the depolymerization process to obtain purified ethylene glycol terephthalate. And carrying out a solvent recovery process, namely collecting waste liquid generated in the extraction process and the depolymerization process, and recovering ethylene glycol in the waste liquid through a distillation separation system.

The present invention relates to a process for depolymerizing a polyester feedstock comprising opaque PET, which comprises: a) a conditioning step; b) a step of glycolysis, operated at between 180 and 400° C., a residence time of from 0.1 to 10 h in the presence of diol; c) a diol separation step, at a temperature of between 100 and 250° C., a pressure lower than that of step b) and producing a diol effluent and an effluent rich in monomers; d) a step of separating into a heavy impurities effluent and a prepurified monomers effluent, at a temperature of less than 250° C. and a pressure of less than 0.001 MPa and a residence time of less than 10 min; e) a step of decolourizing the prepurified monomers effluent, by adsorption of a mixture comprising between 20% and 90% by weight of the prepurified monomers effluent and a solvent, at a temperature of between 100 and 200° C., a pressure of between 0.1 and 1.0 MPa and in the presence of at least one adsorbent.

The invention discloses a flexographic printing anti-counterfeiting high-activity dry yeast packaging composite film and a preparation method thereof, the composite film is a composite film with a three-layer structure, the outer part is a printing layer, the middle part is a barrier layer, the inner part is a heat sealing layer, ultraviolet light explicit and implicit ink is printed on the film, and the layers are compounded by adopting an adhesive. The printing layer is a double-corona biaxially oriented polypropylene or biaxially oriented polyethylene glycol terephthalate film base material, the middle barrier layer is an aluminum foil or aluminized polyethylene glycol terephthalate film, and the inner printing layer is an antistatic PE film; a double-component polyurethane solvent-free adhesive is adopted between the layers to form a composite film. The flexographic printing mode is adopted, the height line number needed by anti-fake printing is achieved, the randomly-arranged pattern sequence is adopted, the forgery possibility is greatly reduced, due to the addition of the anti-reflection master batch, the film has higher transparency, and the definition of anti-fake printing is improved.

The invention discloses an optical paste film and a preparation method thereof, and relates to the technical field of optical functional materials. The optical slurry film is prepared by taking a polyethylene glycol terephthalate film as a base material and coating an optical slurry coating, the optical slurry coating is prepared from the following raw materials in parts by weight: 12 to 16 parts of nano silicon dioxide, 22 to 28 parts of acetone and butanone mixed solvent, 7 to 9 parts of modified titanium dioxide, 4 to 6 parts of nano zirconium oxide, 30 to 35 parts of modified epoxy resin, 18 to 22 parts of butyl acrylate, 4 to 6 parts of dioctyl sebacate, 2.5 to 3.5 parts of silane coupling agent KH-570, 1 to 1.5 parts of organic silicon flatting agent and 0.6 to 1 part of organic silicon defoaming agent. 1.2-1.8 parts of an antioxidant 1010, 3-4 parts of a photoinitiator 184 and 6-8 parts of bis (4-tert-butylphenyl) iodine hexafluorophosphate; the polyethylene glycol terephthalate film pretreatment material comprises absolute ethyl alcohol and deionized water. The raw materials are scientifically proportioned, the titanium dioxide and the epoxy resin are clearly modified, the preparation process is complete, and the finished product is high in light transmittance, good in weather resistance, adaptive to the requirements of the optical field and high in practicability.

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 present invention relates to a process for preparing bis-(2-hydroxyethyl) terephthalate by depolymerization of a plastic filler comprising PET, comprising: a) a step of depolymerization of the PET in the presence of a diol, so as to have a weight ratio between the diol and the PET of the plastic filler of between 0.3 and 8.0, said step a) comprising a reaction phase operated between 150 and 300°C, b) a step of evaporation of the BHET to produce a BHET-rich stream and a heavy impurity stream, step b) using an evaporator comprising an evaporation zone and a zone for withdrawing the heavy impurity stream, and a section for discharging the heavy impurity stream located downstream of the evaporator, the evaporator being operated at a pressure less than or equal to 0.0010 MPa,and in which the evaporation zone is operated between 120 and 300°C and the heavy impurity stream withdrawal zone and the heavy impurity stream discharge section at a temperature greater than 250°C and less than or equal to 300°C.,

The invention relates to a method for efficiently depolymerizing, decoloring and purifying colored waste polyester, which is characterized by comprising the following steps of: (1) feeding waste polyester, a transition metal salt catalyst and ethylene glycol into a reactor, fully mixing and reacting to obtain a depolymerization solution; (2) adding deionized water into the obtained depolymerization liquid, and continuously stirring to ensure that the whole system still has better flowability at the temperature, so as to obtain a diluent of the depolymerization liquid at the temperature; (3) peroxysulfate is added into the diluent of the depolymerization liquid, and the system begins to be subjected to a decolorization reaction; and (4) recrystallizing the solution obtained after the decoloration reaction is finished, and filtering to obtain the recrystallized depolymerized monomer ethylene glycol terephthalate and recovered ethylene glycol. The depolymerization and decoloration purification method has the advantages of environmental protection, high efficiency and low cost.

The invention discloses a Cellulosimicrobium cellulans YH-1, which is characterized in that the Cellulosimicrobium cellulans YH-1 is preserved in the Guangdong Microbiological Culture Collection Center, the preservation number is GDMCC NO: 65134, the preservation date is September 13, 2024, and the 16S rDNA sequence of the Cellulosimicrobium cellulans YH-1 is shown as SEQ ID No: 1, and the Cellulosimicrobium cellulans YH-1 is preserved in the Guangdong Microbiological Culture Collection Center, the preservation number is GDMCC NO: 65134, the preservation date is September 13, 2024, and the 16S rDNA sequence of the Cellulosimicrobium cellulans YH-1 is shown as SEQ ID No: 1. The strain provided by the invention can be applied to biodegradation of polyethylene glycol terephthalate plastics, and a method for degrading polyethylene glycol terephthalate by using the strain has the advantages of greenness, environmental protection, low cost and the like, and is beneficial to treatment of micro-plastic wastes in the environment.

A polyester-based woven hook-and-loop fastener including: a woven-fabric and engaging elements, in which the woven-fabric in which a polyethylene terephthalate-based multifilament yarn is a warp yarn and a polyester-based heat-fusible multifilament yarn is a weft yarn is a woven base fabric, a yarn for the engaging elements made of at least one kind selected from the group consisting of a polyethylene terephthalate-based monofilament yarn and a polyester-based multifilament yarn, is woven in parallel to the warp yarn into the woven base fabric, the engaging elements that are formed of the yarn for the engaging elements, that are made of at least one kind selected from the group consisting of a large number of hook shapes and loop shapes, and that rise up from a front face of the woven base fabric, exist on the front face of the woven base fabric, bases of the engaging elements are fixed to the woven base fabric by a melt-solidified material of a heat-fusible component of the the polyester-based heat-fusible multifilament yarn, and the polyethylene terephthalate-based multifilament yarn is made of a copolymerized polyethylene terephthalate containing, as copolymerization components, 1.0 to 2.0 mol % of isophthalic acid with respect to a total amount of dicarboxylic acids and 2.0 to 3.5 mol % of diethylene glycol with respect to a total amount of diols.

The invention relates to the technical field of dust removal filter materials, in particular to a fiber composite needled filter material and a preparation method thereof. In order to enhance the high-temperature performance of the needle-punched filter material, a modified carbon fiber material is added into polyethylene glycol terephthalate; according to the preparation method disclosed by the invention, the surface of the nano carbon fiber is subjected to carboxylation treatment after being subjected to oxidation treatment, a fluorine element is introduced into the surface of the carbon fiber on the basis, and a structure similar to ethylene glycol terephthalate is further prepared on the surface of the carbon fiber; therefore, the compatibility and the bonding strength between the carbon nanofibers and the polyethylene terephthalate are greatly improved; meanwhile, the fluorine element introduced in the process can greatly improve the stability of the polyester fiber at high temperature and enhance the resistance of the polyester fiber to chemical erosion such as acid and alkali, so that the service life of the filter material in high-temperature flue gas is prolonged.

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 discloses a terahertz metasurface biosensor which is modified by a single-stranded DNA (deoxyribonucleic acid) nucleic acid aptamer and is used for specifically detecting a tumor necrosis factor-alpha. Under the simulation condition, the surface of the biosensor is covered with a layer of analyte with the thickness of 20 microns, and when the refractive index of the analyte is changed from n = 1 to n = 2, the theoretical sensitivity of the metasurface biosensor can reach 124.71 GHz / RIU. In an experiment, the metasurface is prepared on a copper-plated polyethylene glycol terephthalate sheet by using photoetching and chemical corrosion processes. Then, according to the characteristic that the nucleic acid aptamer is specifically combined with the tumor necrosis factor-alpha, the nucleic acid aptamer is modified on the surface of the sensor, so that the super-surface biological immunosensor is prepared, the concentration detection of the tumor necrosis factor-alpha is realized, the detection limit reaches 0.1 ng / ml, and the detection sensitivity can reach 13.9 GHz / 1g (ng / ml). Besides, ovalbumin and whey protein with the same concentration are compared and detected, and the result shows that only the tumor necrosis factor-alpha can be obviously distinguished, so that the sensor has a specific detection function. The terahertz metasurface immunosensor provided by the invention realizes the specific detection of the tumor necrosis factor-alpha. The work can be used for biomarker detection and early diagnosis of diseases.

The invention relates to a copper cluster scintillator constructed on the basis of diphenyl-2-pyridine phosphine and cuprous iodide and a preparation method and application of the copper cluster scintillator. The preparation method comprises the following steps: constructing a copper cluster scintillator by using diphenyl-2-pyridine phosphine and cuprous iodide, and preparing the copper cluster scintillator into a semitransparent scintillator film by using polyvinylpyrrolidone as a high-molecular polymer matrix and polyethylene glycol terephthalate as a spin-coating substrate; the scintillator film and a photomultiplier are optically coupled and integrated with nuclear electronics equipment to develop an alpha / beta particle pollution monitor. The copper cluster scintillator provided by the invention has excellent X-ray luminescence performance, and can realize high-sensitivity scintillation response to alpha / beta particles; the surface pollution monitor can realize sensitive detection of alpha / beta particles in the environment, and has important application value in the field of environmental radiation detection.

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 belongs to the technical field of resource circulation, and mainly relates to a method for recovering polyethylene glycol terephthalate from a retired photovoltaic module backboard. The method comprises the following steps: after crushing a laminated part without an aluminum frame and a junction box, mixing the crushed laminated part with an alkaline alcohol solution to obtain a fluorine-containing backboard; and mixing the fluorine-containing back plate with a binary eutectic solvent, and carrying out heating reaction to obtain the fluorine film and PET (Polyethylene Terephthalate). According to the method, the eutectic solvent is selected as a selective separation solvent, and the binder impurities in the backboard composite material are selectively dissociated through temperature regulation and control, so that complete stripping and high-purity recovery of the PET layer are realized. The separation method is safe, efficient, simple to operate and environment-friendly, and provides a safe and sustainable technical route for recycling the PET material in the retired photovoltaic module.

The invention belongs to the field of photovoltaic modules, and particularly relates to a light conversion adhesive film, a photovoltaic module and application. The light conversion adhesive film comprises a shielding barrier layer, a light conversion adhesive film layer arranged on one side of the shielding barrier layer and a UV shielding adhesive film layer arranged on the side, away from the light conversion adhesive film layer, of the shielding barrier layer, and the shielding barrier layer is made of one or more than two materials selected from polycarbonate, polyethylene glycol terephthalate and polyamide. The light conversion adhesive film disclosed by the invention has high-efficiency light conversion and complete ultraviolet shielding, and can meet the high adhesive property requirement of more than 60N / cm when being adhered with TCO (Transparent Conductive Oxide); the packaged HJT assembly has the characteristics of UV aging resistance and damp-heat aging resistance.

The invention provides a multilayer composite barrier film and a preparation method thereof. The multi-layer composite barrier film comprises a middle coating, a plating layer and polyethylene glycol terephthalate layers arranged on the upper side and the lower side of the middle coating respectively, and the middle coating is composed of an inorganic plating layer, a barrier coating layer and a bonding layer. The preparation method is simple in process, the cooking performance and the mechanical performance of the middle layer can be improved through the double-layer polyethylene glycol terephthalate layer, and the bonding performance with the PET layer can be improved while the barrier performance is improved through the bonding layer; the inorganic plating layer and the barrier coating layer have the significance of providing good barrier performance, and the multi-layer composite barrier film has good water vapor / oxygen barrier performance and good thermal stability, transparency and mechanical performance.