14 results about "Polyethylene Terephthalates" patented technology

The invention relates to a protein consisting of an amino acid sequence in which at least one modification selected from the group consisting of the following [1] to [7] is introduced in the amino acid sequence represented by SEQ ID NO: 1: [1] a modification in which the amino acid residue at a position 103 is substituted with a lysine residue, [2] a modification in which the amino acid residue at a position 76 is substituted with a cysteine residue, [3] a modification in which the amino acid residue at a position 144 is substituted with a cysteine residue, [4] a modification in which the amino acid residue at a position 134 is substituted with a glycine residue, [5] a modification in which the amino acid residue at a position 222 is substituted with a methionine residue, [6] a modification in which the amino acid residue at a position 73 is substituted with a glutamine residue, and [7] a modification in which the amino acid residue at a position 203 is substituted with a threonine residue.

The invention relates to a non-destructive method for determining the percentage of recycled polyethylene terephthalate in a preform (12), characterized in that the method comprises: - a first step (E1) of measuring a first representative value of a transmission factor (T(λ1)) of a wall (16) of said preform (12) for at least a first determined wavelength (λ1) located in the visible range; - a second step (E2) of measuring a second representative value of a transmission factor (T(λ2)) of a wall (16) of said preform (12) for at least a second determined wavelength (λ2) located in the near-infrared; - a third step (E3) of calculating a value (rrPET) representative of the percentage of recycled polyethylene terephthalate present in the preform (12) as a function of the first and second values ​​(T(λ1), T(λ2)) measured during the first step (E1) and the second step (E2). Figure for the abbreviation: Figure 5

The application provides an antibacterial and mildew-proof automobile sound-absorbing cotton made of high-performance polypropylene fibers and polyethylene terephthalate fibers and a preparation method thereof, comprising the sound-absorbing cotton, which comprises a three-dimensional reticular continuous porous matrix formed by heat bonding of polypropylene fibers and polyethylene terephthalate fibers, and an antibacterial and mildew-proof component is uniformly dispersed in the three-dimensional reticular continuous porous matrix. The application has reasonable design, adopts a double antibacterial structure of "fiber internal blending loading + surface coating strengthening", and is combined with a broad-spectrum antibacterial agent combination such as silver ion loaded zeolite, the antibacterial component is uniformly dispersed and the addition amount is low. Through testing, the sound-absorbing cotton has no mold growth and no mildew smell after being placed in a closed high-humidity environment at room temperature and 40 DEG C for 20 days, completely solves the mildew smell problem of the interior in a humid area, and effectively guarantees the air quality in the vehicle.

This invention discloses a BhrPETase keratinase mutant and its application in the degradation of polyethylene terephthalate (PET), belonging to the fields of environmental science and enzyme engineering. The site numbers are based on the amino acid sequence shown in SEQ ID NO:1. The mutant contains substitutions of S14G, H78Y, and S184G relative to SEQ ID NO:1, with the preferred amino acid sequence shown in SEQ ID NO:9. Under conditions of 1 mg enzyme protein / g substrate, 65°C, and 96 h, the preferred mutant exhibits a degradation rate of 90.4% for PET membranes and a half-life of 150 h at 60°C, making it suitable for enzymatic degradation and depolymerization of PET.

The application discloses a polyester chemical regeneration method based on multi-parameter crystal form regulation, and belongs to the technical field of high polymer material purification.The polyester chemical regeneration method based on multi-parameter crystal form regulation comprises the following steps: after pretreatment of a depolymerization solution of polyethylene terephthalate, a good solvent is added to obtain a crystallization system; the crystallization system is put into a first-stage crystallizer, the crystallization system is heated to a first-stage initial temperature, the crystallization system is cooled to a first-stage crystallization temperature at a first-stage cooling rate and is kept warm, slurry is obtained, first solid-liquid separation is carried out, and a solution rich in polyethylene terephthalate monomers is obtained; the solution is put into a second-stage crystallizer, initial heating, second-stage monomer nucleation and second-stage monomer growth are sequentially carried out while stirring, and after the completion, second solid-liquid separation, washing and drying are carried out, and polyethylene terephthalate monomers are obtained.The application realizes directional induction and stable generation of alpha crystal form through crystallization process design and multi-parameter regulation.

This invention discloses a skin-friendly, antibacterial, and ammonia-inhibiting diaper surface layer, its preparation method, and the diaper itself. The surface layer is formed from composite fibers; the composite fibers include a core layer and a sheath layer covering the outside of the core layer. The sheath layer is formed by melt spinning a polyethylene masterbatch and a non-leaching physical antibacterial masterbatch; the core layer is formed by melt spinning a polyethylene terephthalate masterbatch. The non-leaching physical antibacterial masterbatch includes a polyethylene carrier and nano-composite antibacterial powder dispersed in the polyethylene carrier. This invention directionally loads the nano-composite antibacterial powder onto the sheath layer, making the sheath layer a soft, skin-friendly contact surface with antibacterial and ammonia-inhibiting functions. The rigid PET core layer provides mechanical support and avoids ineffective consumption of functional masterbatch, thus enabling the diaper surface layer to possess softness, fluffiness, structural stability, and high utilization rate of functional components.

A method of solvent reuse during the alkaline hydrolysis of polyethylene terephthalate (PET) into terephthalic acid (TPA) and ethylene glycol (EG) is described, the method comprising in the following order the steps of: a) contacting PET with a catalyst in a virgin solution comprising at least one solvent in the presence of a base to provide a first reaction mixture containing a first solid phase and a first liquid phase; b) separating the first liquid phase comprising ethylene glycol, the at least one solvent and the base from the first solid phase of the first reaction mixture; c) recovering the first liquid phase to receive a first recovered solution comprising ethylene glycol; d) contacting PET with a catalyst in a second solution comprising at least one solvent in the presence of a base to provide a second reaction mixture containing a second solid phase and a second liquid phase, wherein the second solution comprises the first recovered solution; e) separating the second liquid phase comprising ethylene glycol, the at least one solvent and the base from the second solid phase of the second reaction mixture; f) recovering the second liquid phase to receive a second recovered solution comprising ethylene glycol.

This invention discloses a supported catalyst for the oxidative depolymerization of PET to prepare oxalic acid. Gold nanoparticles are supported on TiO2, which is either anatase or rutile titanium dioxide. The loading amount of gold nanoparticles is 0.1–3.0 wt.%. This invention also discloses a method for converting waste polyethylene terephthalate (PET) into oxalic acid via depolymerization catalytic oxidation. The method includes adding a supported catalyst and waste PET to an alkaline solution, using oxygen as the oxidant, and catalytically oxidizing the PET to obtain oxalic acid. This invention utilizes a supported catalyst to achieve efficient and selective oxidative depolymerization of PET in an oxygen-containing atmosphere and alkaline aqueous solution system, directionally converting it into oxalic acid. It features mild reaction conditions, no need for hydrogen, safe operation, and environmental friendliness, aligning with the development requirements of green chemistry and the circular economy, and possessing broad prospects for industrial application.

The invention relates to hydrolysis-stabilized polyethylene terephthalate (PET)- and / or polylactic acid (PLA)-containing compositions comprising monomeric carbodiimides of the formula (I)where R1, R2, R4 and R6=ethyl andwhere R3, R5 are each independently C1-C6-alkyl,and to processes for preparation of and to the use of these carbodiimides.

A method of depolymerizing polyethylene terephthalate that includes heating to 140 to 210° C. a reaction mixture including polyethylene terephthalate, a salt, urea, and a glycol. The salt includes an alkali or alkaline earth metal cation and a carboxylate having 1 to 6 carbon atoms. The reaction results in depolymerization to form a glycol ester of terephthalic acid including the glycol.

The present application relates to the technical field of polyester waste resource utilization, and particularly relates to an acid-alkali dual-site non-metallic catalyst, a preparation method and application thereof.The acid-alkali dual-site non-metallic catalyst provided by the present application is suitable for oxidative depolymerization of polyester, especially polyethylene terephthalate, has low catalyst dosage, and has excellent reaction kinetic performance, environmental protection and recyclable characteristics.When the mass ratio of PET waste to the catalyst is 100:1 and the reaction time is 30 min at 180 DEG C, the PET degradation rate is 99.97%, the ethylene glycol yield is 91.53%, and the dimethyl terephthalate yield is 90.62%.Further increasing the mass ratio of PET waste to the catalyst to 150:1, the PET degradation rate still remains 97.68%, which indicates that the acid-alkali dual-site non-metallic catalyst provided by the present application has excellent depolymerization performance under high PET load conditions.

This invention relates to a method for preparing a catalyst for in-situ inhibiting lignin condensation during depolymerization under acidic conditions, and its application. The method uses nitrogen-doped lignin-derived porous carbon materials as a carrier, and introduces bimetallic active sites such as cerium and nickel by constructing a hierarchical porous structure using a template method. Under acidic conditions, waste polyethylene terephthalate (PET) undergoes ester bond cleavage under the action of the catalyst. The ethylene glycol generated in situ can interact with the highly active intermediate formed during lignin depolymerization, effectively "capping" the benzylic carbocation, thereby inhibiting the carbocation-induced C-C bond condensation reaction. This invention does not require the introduction of additional exogenous inhibitors and maintains a stable and continuous inhibitory effect under high-temperature acidic conditions. It provides a new technological paradigm for the synergistic resource utilization of mixed solid wastes and has significant scientific and application value in the fields of high-value biomass conversion and plastic recycling.

The present invention provides a protein that can specifically bind to PET; a polynucleotide encoding the protein; a recombinant vector and transformant containing the polynucleotide; a composition containing the protein; and a method for detecting and degrading PET. [Solution] A modified protein having the ability to bind to polyethylene terephthalate; a polynucleotide encoding the protein; a recombinant vector and transformant containing the polynucleotide; a composition containing the protein; and a method for detecting and degrading PET.

The utility model discloses a kind of cosmetic containers with PET (polyethylene terephthalate) lenses, including PET cosmetic container and PET lens, the PET cosmetic container includes bottom support and upper cover, the bottom support is equipped with accommodating groove, the upper cover is rotatably connected on bottom support, the upper cover can be covered on bottom support, and covering accommodating groove, recess is equipped in the upper cover, the PET lens is embedded on recess.The utility model, PET cosmetic container and PET lens are same material, can conveniently the unified recovery of the utility model, and when recycling, lens does not need to be separately disassembled and recycled, can greatly reduce the recovery difficulty and recovery cost.