284 results about "Polyethylene Terephthalates" patented technology

The invention discloses a fusion enzyme capable of efficiently degrading PET (polyethylene terephthalate) plastic and application of the fusion enzyme. The invention provides a recombinant fusion enzyme. The recombinant fusion enzyme comprises a mutant KL-MHETase of thermophilic carboxylesterase Est30 and a PET (Polyethylene Terephthalate) degrading enzyme FAST-PETase, the amino acid sequence of the mutant KL-MHETase of the thermophilic carboxylesterase Est30 is as shown in SEQ ID NO. 3; the amino acid sequence of the FAST-PETase is as shown in the 284th to 546th amino acids of SEQ ID NO.1 (Sequence Identifier Number 1). The fusion enzyme is used as a biocatalyst, the activity of catalyzing hydrolysis of MHET at 50 DEG C is 52.6 times that of FAST-PETase, and the fusion enzyme has high enzyme activity and thermal stability. PET degradation is catalyzed at the temperature of 50 DEG C, the conversion rate of PET is 90% after 48 hours of reaction, and meanwhile, the TPA content in the product is close to 100%.

The invention relates to the technical field of chemical degradation of waste polyester, and discloses a titanium-rare earth compound catalyst which comprises a titanium-containing compound and a rare earth catalyst, wherein the titanium-containing compound is selected from at least one of dihydric alcohol modified alkyl titanate, alkyl titanate, dihydric alcohol titanium, titanium phosphate and organic-inorganic hybrid titanium; wherein the rare earth catalyst is selected from acetylacetone rare earth catalysts. The titanium-rare earth compound catalyst has the characteristics of high PET depolymerization rate, low polymerization degree in a depolymerization product, small catalyst dosage, high catalyst selectivity and high yield and purity of a depolymerization product bis (2-hydroxyethyl) terephthalate (BHET) in a degradation reaction of polyethylene glycol terephthalate (PET). 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 belongs to the technical field of bioengineering, and particularly discloses a chimeric enzyme for degrading PET (Polyethylene Terephthalate) as well as a related biological material and application of the chimeric enzyme. The chimeric enzyme for degrading PET provided by the invention is obtained by replacing at least one fragment in an amino acid sequence as shown in SEQ ID No.1-12 on the basis of IsPETase. Compared with IsPETase, the chimeric enzyme for degrading PET provided by the invention has the advantages that the thermal melting temperature is increased by 4.8-31.7 DEG C, the concentration of a degradation product TPA after PET degradation is increased by 1.5-44.5 times, while the application conditions of PET degradation are widened, the PET degradation efficiency can be greatly improved, the recycling rate of the degradation product TPA with high added value is increased, and the chimeric enzyme has important economic value and environmental benefit. The method can be used in the fields of PET degradation, PET degradation agent preparation or PET degradation product preparation and the like.

The invention discloses a PET bottle flake impurity removal device, and relates to the technical field of PET bottle flakes, the PET bottle flake impurity removal device comprises an annular belt and a first screening box, a plurality of positioning wheels are symmetrically and tightly attached to the inner side of the annular belt, a driving assembly is arranged on one side of a first holder, and a plurality of screening cages are fixedly arranged on the inner side of the annular belt at equal intervals; and pressing rollers are rotationally arranged in the screening cages, a first cleaning mechanism is arranged on one side of the first holder, a second cleaning mechanism is arranged in the first screening box, and a third cleaning mechanism is arranged in the second screening box. Pressing rollers are rotationally arranged in a plurality of screening cages on an annular belt, so that bottle chips in the screening cages are dried and subjected to impurity removal, the bottle chips can be in full friction contact with a first screening box and a stirring roller through revolution and rotation of the stirring roller, and the bottle chips are separated through rotation of a spiral plate; and the bottle chips are driven to enter the position of the separation brush roller for secondary washing and impurity removal, so that the impurities of the bottle chips are fully removed.

The invention relates to the technical field of self-healing agents, in particular to a well cementation cement slurry self-healing agent and a preparation method thereof. The modified polyethylene glycol terephthalate polymer comprises the following components in parts by weight: 30-50 parts of modified polyethylene glycol terephthalate polymer, 2-10 parts of metal oxide, 5-15 parts of lithium silicate, 0.5-2 parts of persulfate, 0.1-1 part of bacillus subtilis and 1-5 parts of calcium lactate. The isosorbide can react with ester bonds in polyethylene glycol terephthalate, so that more hydroxyl groups are introduced, and the hydroxyl groups can interact with cement hydration products or metal oxides and lithium silicate to promote formation of new mineral phases at cracks. The generation of the new mineral phase is beneficial to filling and repairing cracks, and the self-healing of the cement paste is realized, so that the long-term stability of a well cementation structure is improved. Tetraethyl orthosilicate can cooperate with other components such as the modified polyethylene glycol terephthalate polymer to jointly promote the self-healing process of set cement.

The invention discloses a polyester fiber for antibacterial wiping and wiping cloth prepared from the polyester fiber, and relates to the technical field of polyester fibers. The antibacterial polyester fiber for wiping is prepared from the following components in parts by weight: 10 to 20 parts of antibacterial PET (Polyethylene Terephthalate) master batch and 100 parts of PET slices, wherein the antibacterial PET master batch is prepared from the following components in parts by weight: 1 to 1.5 parts of an antibacterial component I, 23.25 parts of PET slices and 0.25 to 0.75 part of a compatilizer. The wiping cloth is prepared by spinning antibacterial wiping polyester fibers into a required product specification, then carrying out plasma modification treatment, spraying an antibacterial spraying liquid, and drying. Wherein the antibacterial spraying liquid comprises the following components in percentage by mass: 3-5% of an antibacterial component II, 3-5% of silver nitrate, 1-2% of a silane coupling agent and the balance of deionized water.

The utility model relates to the technical field of car trunk cover plates, in particular to a turnover type PET (polyethylene terephthalate) waterproof cover plate for a trunk, which comprises a cover plate body, a sliding chute and a flow guide box, the sliding chute and the flow guide box are positioned on two sides of the cover plate body, and the flow guide box is positioned at the bottom of the sliding chute. The cover plate body is composed of an upper folded plate, a lower folded plate and a sealing rotating shaft connected with the upper folded plate and the lower folded plate. According to the luggage case, moisture can be effectively isolated through the water retaining strip, so that articles in the luggage case cannot be soaked by accumulated water; accumulated water can be effectively guided to flow into the flow guide box through the gap design of the water retaining strips, accumulation of the accumulated water on the surface of the cover plate is avoided, and the waterproof effect is further improved; the push plate is driven by the synchronous belt to slide along with the cover plate body to push and discharge accumulated water; the cover plate body is composed of the upper folding plate and the lower folding plate, folding is achieved through the connecting piece, storage is convenient, and space is saved.

The invention discloses a super-condensation composite brightness enhancement film and a liquid crystal display backlight module, and particularly relates to the technical field of brightness enhancement films.The super-condensation composite brightness enhancement film comprises a core layer, an upper-layer brightness enhancement structure and a lower-layer brightness enhancement structure, the core layer is a multi-layer film made of poly (ethylene naphthalate) and a copolymer thereof, the upper-layer brightness enhancement structure is fixed to the top of the core layer, and the lower-layer brightness enhancement structure is fixed to the bottom of the core layer; the upper-layer brightening structure comprises a plurality of light gathering blocks, the light gathering blocks are distributed on the top of the core layer in a linear array mode, the light gathering blocks are arranged to be in a trapezoid quadrangular prism shape or a hexagonal pyramid shape, and the lower-layer brightening structure is fixed to the bottom of the core layer. The large-angle light of the incident surface is subjected to primary convergence through the plurality of inverse prism structures at the bottom of the core layer, and the large-angle light of the emergent surface is subjected to secondary convergence through the plurality of concave trapezoidal quadrangular prism-shaped or hexagonal pyramid-shaped light condensation blocks at the top of the core layer, so that the light loss is reduced, and the brightness of the backlight center is improved; and the hexagonal pyramid-shaped light condensation block can also improve the uniformity of the visual angle.

Process for purifying bis (2-hydroxyethyl) terephthalate (BHET) from a crude solution obtained by glycolysis of ethylene glycol (EG) from polyethylene terephthalate (PET) waste containing at least one dissolved barrier polymer, water being added to the crude solution in a predetermined amount as an anti-solvent for the barrier polymer, and controlling the temperature to ensure that the solubility of the barrier polymer is significantly reduced without causing precipitation of BHET and its oligomer. Specifically, water is added to the crude BHET solution in at least two different stages, the weight ratio between EG and H2O is reduced, and the temperature is also reduced. In this way, the barrier polymer can be more effectively removed, and precipitation of BHET and its oligomer is not caused. Furthermore, in this manner, the volume of the liquid to be treated can be maintained within a relatively small value, thereby avoiding equipment defects associated with the treatment of large quantities of liquid by decantation and / or filtration, which may cause the process to be inconvenient from the industrial perspective.

The invention discloses high-crystallinity copolyester based on furandicarboxylic acid as well as a preparation method and application of the high-crystallinity copolyester. The structural formula of the high-crystallinity copolyester is as follows: # imgabs0 # R1 is-O (CH2) aO-, R2 is-O (CH2) bO-, a, b, x, y, z and n are integers, a = 2-6, b = 6-12, x = 1-10, y = 1-10, z = 1-10, and n = 20-100; and (x + z): y = 1: 1-1: 10. The present invention also provides a highly crystalline copolyester article made from the highly crystalline copolyester. The high-crystallinity copolyester disclosed by the invention not only has excellent crystallization capacity, relatively high crystallinity, excellent thermal stability and mechanical property, but also has excellent barrier property, and has obvious advantages in various gas barrier aspects compared with PET (Polyethylene Terephthalate) on the market; the material can be widely applied to the fields of high-temperature-resistant materials, express packages, food packages, food tableware and the like.

Methods to identify, select, and / or produce enzymes with improved degradation activity to polyethylene terephthalate are provided. In some examples, the methods include expressing a fusion protein comprising a protein of interest linked to a reporter protein in a cell; contacting the fusion protein with a substrate for the protein of interest; detecting a signal from the reporter protein; and detecting degradation of the substrate for the protein of interest, wherein signal from the reporter protein indicates expression of the fusion protein and increased degradation of the substrate compared to a control indicates that the protein of interest has increased PET degradation activity.

The invention discloses a modified and toughened PET (polyethylene terephthalate) endurance plate and a preparation method thereof, and relates to the technical field of PET modification, the modified and toughened PET endurance plate is composed of a macromolecular prepolymer, a toughening modifier, a compatilizer, matrix PET resin and a nanoscale inorganic filler; the macromolecular prepolymer is introduced into a branched structure through a modified chain extender, so that the strength and toughness of the matrix are improved; the toughening modifier adopts an elastomer and a functional monomer for graft copolymerization, so that the impact property is improved; the compatilizer is prepared by condensing an oligomer and a surface coupling reagent, so that the interfacial compatibility is improved; the nano filler is subjected to surface modification, so that the impact resistance and thermal stability of the material are enhanced; according to the invention, component synergy is realized through a multi-stage mixing and segmented feeding process, functional components such as a flame retardant and a light stabilizer are further introduced, the flame retardance, weather resistance and aging resistance are remarkably improved, the defects of fragility and multi-component blending interface of traditional PET are overcome, and the composite material is widely applicable to the field of high-performance plastic products.

The utility model relates to the technical field of PET (Polyethylene Terephthalate) sheet cooling, and discloses a cooling device after PET sheet extrusion, which comprises an operation table, a cooling table is fixed on one side of the operation table, a plurality of rolling shafts are arranged in the cooling table at intervals, and a cooling structure is arranged above the cooling table. Through the arrangement of the cooling structure, a sheet sequentially penetrates through the three cooling rollers, the surface temperature of the sheet is rapidly reduced to a reasonable range through contact of the cooling rollers, the internal and external temperature difference is reduced, then the sheet enters the cooling bin, cold air is circularly sprayed out through the upper and lower cold air pipes, and the upper and lower surfaces of the sheet are uniformly cooled; a worker conveys cooling water to the atomization spray head through the conveying pipe and the flow dividing bin, sprayed water mist is distributed on the surface of the sheet along with cold air, heat is rapidly taken away after heat absorption and vaporization, the heat conduction efficiency is remarkably improved through combination of the cold air and the water mist, the sheet is cooled more efficiently and evenly, and the surface quality and the size stability of the sheet are further guaranteed.

Disclosed is a process for hydrolytic depolymerization of a polyamide contained in a chemical feedstock F, wherein the process comprises: providing the chemical feedstock F; providing a liquid aqueous stream SW; preparing a mixture comprising the raw material F and the liquid aqueous stream SW and subjecting said mixture to polyamide 6 depolymerization conditions in a chemical reaction unit UR, thereby obtaining an aqueous stream SE exiting the UR, the stream SE comprising epsilon-caprolactam, wherein the mixture to be subjected to polyamide 6 depolymerization conditions comprises polyamide 6 and further comprises polyethylene terephthalate and polyamide 6.6 in a mass ratio rS = (mPA6.6 + mPET) / mPA6, wherein 0.01 < = rS < = 2.5.

The invention relates to a specific PET molecular probe of a targeted KRASG12D mutant as well as a preparation method and application of the specific PET molecular probe. Pyridopyrimidine compounds and R5 are subjected to cooling reaction under the action of N, N-diisopropylethylamine to generate a compound 2; the compound 2 and (2-fluorotetrahydro-1H-pyrrolizine-7A (5H)-yl) methanol are subjected to a heating reaction under the action of N, N-diisopropylethylamine, and a compound 3 is generated; carrying out heating reaction on the compound 3 and biphenyl boronic acid pinacol ester under the action of N, N-diisopropylethylamine and tetrakis (triphenylphosphine) palladium to generate a compound 4; carrying out heating reaction on the compound 4 and 1, 2-bis (tolyloxy) alkane under the action of potassium carbonate to generate a compound 5; the compound 5, radioisotope < 18 > F and an anion complexing agent are subjected to a heating reaction under the action of potassium carbonate to generate the trisubstituted pyridopyrimidine < 18 > F labeled PET molecular probe. Compared with the prior art, the kit has a positioning diagnosis effect on KRASG12D mutant tumors, and image typing of mutant and non-mutant tumors and pathological evaluation after tumor treatment are realized at the same time.

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 discloses a micro-plastic degrading bacterium P.ataveovii and application thereof, and belongs to the technical field of microorganisms. According to the invention, a strain of Priestia aryabhattai BK12 is separated and screened from plastic wastes, and the plastic degradation capability of the Priestia aryabhattai BK12 is deeply explored. A research result shows that the P.avenae BK12 can be used for efficiently degrading the PET (Polyethylene Terephthalate), and the P.avenae BK12 can be used for efficiently degrading the PET (Polyethylene Terephthalate), so that the P.avenae BK12 can be used for efficiently degrading the PET (Polyethylene Terephthalate). The invention provides a new microbial resource for the development of a plastic degradation agent, contributes to promoting the development of a biodegradable plastic technology and solving the problem of environmental pollution caused by PET, and assists in realizing the goal of green and sustainable development.

The invention discloses an efficient continuous PET (polyethylene terephthalate) degradation process based on a membrane method technology, which comprises the following steps: mixing an immobilized enzyme compound, a PET raw material to be degraded and a glycine buffer solution to form a reaction solution for degradation, then constructing a'continuous reactor 'by using two size screening membranes, performing primary separation by using an ultrafiltration membrane or a microfiltration membrane, and performing secondary separation by using an ultrafiltration membrane or a microfiltration membrane. A nanofiltration membrane or a reverse osmosis membrane is adopted for secondary separation of the degradation product, automatic separation of the degradation product and a reaction system and automatic purification of the degradation product are achieved, and then the enzymatic degradation efficiency and the product recovery efficiency are improved. Through the construction of the continuous reactor, the automatic PET degradation is realized, so that the costs in the aspects of labor, time, economy and the like are remarkably saved. The undegraded PET and a small amount of exfoliative enzyme can be circulated back to the reaction kettle after being intercepted by the size screening membrane, and the process not only can promote full contact between the undegraded PET and the hydrolase, but also can reduce the loss of the enzyme in the degradation process.

The invention belongs to the technical field of microbiology and enzyme engineering, and relates to a PET degrading strain derived from deep sea, a PET degrading enzyme and application thereof. The invention discloses a PET (Polyethylene Terephthalate) degrading strain derived from deep sea, which is halophilic pseudomonas sp. EEDS01, is preserved in China Center for Type Culture Collection on November 28, 2024, and has the preservation number of CCTCC NO: M20242659. The invention further discloses a preparation method of the PET degrading strain. The invention also provides PET (Polyethylene Terephthalate) degrading enzymes PnPETase1, PnPETase2, PnPETase3 and PnPETase4 which are derived from the bacterial strain, and the amino acid sequences of the PET degrading enzymes are respectively shown as SEQ ID NO.2-5 in a sequence table. The bacterial strain for degrading PET and four PET degrading enzymes provided by the invention have strong PET hydrolysis capability under high salt concentration, and have important significance in the fields of environmental protection and catalysis.

The invention discloses a flexible self-driven optical-electric coupling pressure visualization device and a preparation method thereof, and belongs to the technical field of flexible photoelectric sensors. The device comprises a substrate, an ion storage layer, a VHB packaging layer, a dual-mode electrochromic layer and a liquid metal layer, the ion storage layer and the VHB packaging layer are sequentially arranged between the substrates from top to bottom, the dual-mode electrochromic layer, the liquid metal layer and the VHB packaging layer are of an annular structure, a cavity is formed in the middle of the VHB packaging layer, the raw materials of the substrates are polyethylene glycol terephthalate, and the raw materials of the substrates are polyethylene glycol terephthalate. The raw material of the ion storage layer is mixed gel of polyacrylamide and lithium chloride, the raw material of the dual-mode electrochromic layer is a mixture of Eu < 3 + >-doped WO3 and silver nanowires, and the raw material of the liquid metal layer is indium-based alloy. According to the invention, the structure compactness of the device can be effectively improved, the structure of the device is simplified, the pressure change visualization can be realized under the passive self-driving condition, the energy consumption is low, the use is convenient, and the applicability is excellent.

The invention discloses an antibacterial breathable ES fiber and a preparation method thereof, and relates to the technical field of sanitary fibers. The preparation method comprises the following steps: firstly, preparing aldehyde chitosan; then, glutaraldehyde is used as a cross-linking agent, silicon dioxide and aldehyde chitosan are subjected to chemical cross-linking, nano-silver particles are added in the cross-linking process, the nano-silver particles are coated, then freeze drying is conducted, and composite aerogel is obtained; the composite aerogel has good compatibility with a core material PET (Polyethylene Terephthalate). Secondly, silver acetate and the carbon spheres are used for preparing hollow calcium carbonate microspheres doped with silver ions, then a silane coupling agent is used for conducting surface modification on the calcium carbonate microspheres, the porosity of a wrapping layer is increased through the hollow porous structure, and the air permeability of the ES fiber is improved; amino groups on the surfaces of the modified calcium carbonate microspheres can be combined with aldehyde groups of aldehyde chitosan to generate Schiff base; and the generated Schiff base and the metal silver of the skin-core layer take effect synergistically from chemical and physical aspects to achieve the purpose of high-efficiency antibiosis. The ES fiber prepared by the invention has antibacterial and breathable effects.

The invention discloses a metal oxide catalyst for alcoholysis of PET as well as a preparation method and application of the metal oxide catalyst, and belongs to the technical field of degradation and recycling of high polymer materials. The metal oxide catalyst for alcoholysis of PET comprises an active component and an auxiliary agent, the active component is a mixture of MgO and ZnO, the auxiliary agent is one of metal oxides of Fe and Bi, the molar weight ratio of ZnO to MgO in the active component is (2-10): 1, the loading capacity of the auxiliary agent is 0.1-5 wt% based on the elementary substance of metal elements in the auxiliary agent component, and the loading capacity of the auxiliary agent is 0.1-5 wt% based on the elementary substance of metal elements in the auxiliary agent component. The metal oxide catalyst is synthesized by adopting coprecipitation and a rotary evaporation impregnation method. The metal oxide catalyst is applied to alcoholysis of waste PET and ethylene glycol, has good catalytic performance and can catalyze alcoholysis of PET and ethylene glycol to generate BHET, the PET conversion rate is high, the BHET yield is high, and the catalyst is good in stability in the alcoholysis process.

The utility model discloses a PET (Polyethylene Terephthalate) material blister tray forming die which comprises a forming die assembly, a blister assembly is fixedly arranged on the outer surface of the lower end of the forming die assembly, and the forming die assembly comprises a die plate, a forming cavity, a bottom forming plate, an air exhaust hole and an annular air passage, and the plastic uptake assembly comprises a base plate, a surrounding plate, a top plate, a connecting nozzle, an air exhaust header pipe, a fixing frame, air exhaust branch pipes, expansion openings, an air exhaust cavity and supporting columns, and the mold plate is fixedly installed on the outer surface of the upper end of the top plate. According to the PET material plastic uptake tray forming mold, the bottom forming plate and the mold plate are arranged in a split mode, the annular air channel is reserved between the outer wall of the bottom forming plate and the forming cavity, so that a base material can be well attached to the mold at the corner position, the product quality is improved, the plastic uptake assembly is arranged, and the forming mold is convenient to use. And through the arranged supporting columns, the bottom forming plate can be supported and fixed.

The invention discloses a PET (Polyethylene Terephthalate) degrading enzyme and an application thereof in the aspect of degrading PET plastics. The hydrolase LfPETase capable of degrading the PET plastic is screened from metagenomes of landfill soil samples of a garbage dump, the amino acid sequence of the hydrolase LfPETase is shown as SEQ ID NO.2, the similarity between the amino acid sequence of the hydrolase LfPETase and the highest sequence of 10 kinds of currently known common PET degrading enzymes is only 39.42%, and the novelty of a sequence skeleton of the hydrolase LfPETase is indicated. According to the invention, a pichia pastoris engineering strain capable of efficiently expressing and coding the PET degrading enzyme gene is constructed, and the specific activity of the recombinant degrading enzyme LfPETase obtained by purification is up to 250 U / mg when p-nitrophenyl octyl ester (pNPO) is taken as a substrate; after consumption, PCW-PET bottle flake plastic is taken as a substrate, degradation is carried out at 70 DEG C for 12 h, the depolymerization rate can reach 92%, and a new enzyme resource is provided for plastic enzymatic depolymerization recycling.

The present application provides compositions, excipient systems, methods, and dispensers for delivery of active pharmaceutical ingredients (APIs). In one example, a composition is provided comprising an active pharmaceutical ingredient; one or more excipient compound(s) selected from a hydroxyalkyl ester of an aliphatic fatty acid, a hydroxyacid alkyl ester, an alkyl ester of a fatty acid, and combinations thereof; and a semi-fluorinated alkane compound. In another example, an excipient system is provided comprising one or more excipient compound(s) selected from a hydroxyalkyl ester of an aliphatic fatty acid, a hydroxyacid alkyl ester, an alkyl ester of a fatty acid, and combinations thereof and a semi-fluorinated alkane compound. Dispensers containing the compositions are also provided and include glass and polyethylene terephthalate dispensers or containers. Methods of using the compositions are also provided and include a method for treating a condition in a subject comprising administering the compositions to the subject.

The invention discloses a preparation method of superfine high-moisture-absorption ES hollow fibers, and relates to the technical field of textiles. According to the invention, polyethylene terephthalate is used as a core layer, steric hindrance of a molecular chain of polyethylene terephthalate is increased through 5-methyl isophthalic acid, diffusion and adsorption of water molecules are facilitated, hygroscopicity is realized, then sulfonated sodium dioctyl succinate is compounded with anionic and cationic surfactants to form a hydrophilic finishing agent, moisture retention of the fiber is realized, and then the fiber is subjected to hydrophilic finishing to form a hydrophilic finishing agent. An inorganic filler is added and is coated through the physical adsorption and chemical reaction effects of stearic acid ester, the number of gaps is increased and channels of water molecules are increased by virtue of the incompatibility of the filler and resin, then during spinning, the hydrophilic finishing agent has an overall anionic property, so that a matrix is assisted to reduce friction, and in a high-speed stretching process, the hydrophilic finishing agent has a hydrophilic property. The chemical fibers are prevented from generating tows which are dispersed and are not easy to wind, and the fibers form a certain physical-mechanical property and a stable structure through secondary stretching.

The present disclosure relates to methods designed for the depolymerization of poly(ethylene terephthalate) (PET) and the subsequent recovery and reuse of the PET deconstruction products. Among other things, the present disclosure describes methods for generating enriched reaction media, where the method includes providing a first amount of PET to a reaction chamber, performing depolymerization of the PET, thereby generating a first reaction media, adding a second amount of PET to the first reaction media, and performing depolymerization on the combined second amount of PET and the first reaction media, thereby generating an enriched hydrolysis reaction media, thereby enabling improved downstream separation of the deconstruction products.

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 invention discloses a PET (positron emission tomography) imaging agent, a precursor and a probe for targeting an EphA2 receptor as well as a preparation method and application of the PET imaging agent, the precursor and the probe, and a radioactive probe which is formed by labeling a chelating agent (such as DOTA and NOTA) and a radionuclide (such as 68Ga) by taking bicyclic peptide as a targeting group is specifically combined with the EphA2 receptor highly expressed on the surface of a tumor cell. According to the invention, a conformation limitation strategy is adopted for transforming the peptide probe targeting EphA2 for the first time, the bicyclic peptide radioactive probe with excellent targeting performance and in-vivo imaging effect is obtained, the tumor uptake value is high, and tumor and non-tumor imaging is clear; and successful imaging in a fibrosarcoma model. According to the EphA2 receptor-targeted PET imaging agent provided by the invention, the precursor, namely the probe, has the advantages of simplicity in preparation, good targeting property, excellent imaging effect and the like, can be used for PET imaging diagnosis, prognosis evaluation and targeted therapy guidance of EphA2 positive tumors, and has good clinical value.

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.