203 results about "Polyethylene Terephthalates" patented technology

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.

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 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 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 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.

The utility model discloses a tension-adjustable PET bright strip slitting guide device which comprises a bottom plate and a mounting frame, the mounting frame is fixedly mounted at the upper end of the bottom plate, a slitting structure is mounted on one side of the upper end in the mounting frame, and an adjusting guide structure is mounted on the other side in the mounting frame; the adjusting and guiding structure comprises two driving frames, two motors, two lead screws, two moving blocks, an adjusting frame, a plurality of partition plates and a plurality of guiding assemblies. The utility model relates to the technical field of bright strip cutting and conveying, in particular to an adjusting and guiding structure which can adjust the overall height of an adjusting frame and synchronously adjust the tension of a plurality of PET bright strips through the matching of two motors and a lead screw, so that the winding and slitting effects of the PET bright strips are preliminarily ensured, and the production efficiency is improved. And then, according to different winding devices and the winding number, independent tension adjustment can be conducted on the multiple PET bright strips through the multiple guide assemblies, and the slitting and winding effects of the PET bright strips are further guaranteed.

The invention discloses a conductive polyester fiber and a preparation method and application thereof, and relates to the field of functional fibers.The conductive polyester fiber is of a skin-core structure, a core layer component comprises first polyethylene glycol terephthalate, and a skin layer component comprises second polyethylene glycol terephthalate, a first polyamide elastomer and conductive carbon black masterbatch; the conductive carbon black master batch comprises a second polyamide elastomer and conductive carbon black; the zero-shear viscosity difference value of each polyamide elastomer and each polyethylene glycol terephthalate is controlled, so that the melt viscosity of the polyamide elastomer is lower than that of the polyethylene glycol terephthalate, and the low-viscosity polyamide elastomer is easy to diffuse to the surface of the fiber in the spinning process to drive the conductive carbon black to be enriched on the surface of the fiber; a hard segment in the polyamide elastomer can be crystallized in the stretching and drafting process, so that the conductive carbon black is promoted to be transferred to an amorphous region and enriched; practice shows that the fiber disclosed by the invention not only has excellent conductivity, but also has properties such as lasting stability and excellent mechanical properties.

The utility model discloses a six-fold portable mirror which comprises six square PET (Polyethylene Terephthalate) mirrors with the same size, and each two PET mirrors are arranged in parallel in a row; the five groups of hinges are arranged, three groups of hinges are respectively arranged between two parallel PET mirrors, the positions of the hinges are deviated to the front of the PET mirrors, the other two groups of hinges are respectively arranged between one PET mirror in the most front row and one PET mirror in the adjacent middle row, and the other two groups of hinges are respectively arranged between the other PET mirror in the most front row and one PET mirror in the adjacent middle row. The hinge is arranged between one PET mirror in the last row and the other PET mirror in the adjacent middle row, and the position of the hinge is deviated to the mirror back surface of the PET mirror; and the six PET mirrors are folded into the size of the PET mirror with the upward back surface along the direction of the hinges or unfolded into a large-size mirror. According to the six-fold portable mirror, the folding effect is achieved through the small mirror, the hinges and other components, the six-fold portable mirror can be unfolded or folded according to use requirements, and carrying and transportation are convenient. And the magnetic attraction structures are arranged between the adjacent PET mirrors which are not provided with the hinges.

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.

The invention relates to the technical field of waste polyester recycling and reusing, and discloses a method for depolymerizing copolyester, a depolymerization product and application of the depolymerization product in preparation of the copolyester. The preparation method comprises the following steps: carrying out a depolymerization reaction on copolyester with an average particle size of 0.1-5 cm to obtain a depolymerization solution containing bis (2-hydroxyethyl) terephthalate, a bis (2-hydroxyethyl) terephthalate dimer and cyclohexanedimethanol terephthalate; wherein the copolyester is polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol ester, the water content in the copolyester is less than or equal to 2wt%, and the catalyst is a titanium-containing catalyst. According to the method disclosed by the invention, chemical depolymerization of PETG (or PCTG) copolyester can be realized, the depolymerization rate of the copolyester is improved, and a recyclable polymeric monomer is obtained.

The present application relates to a kind of polyethylene terephthalate-2,5-furandicarboxylic acid glycol copolyester foamed material and its preparation method, the preparation method includes the following steps: polyethylene terephthalate-2,5-furandicarboxylic acid glycol copolyester 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;Sheet material is treated with foaming, and polyethylene terephthalate-2,5-furandicarboxylic acid glycol copolyester foamed material is obtained.The present application uses melt isothermal crystallization treatment, can improve the melt strength in the foaming process of polyethylene terephthalate-2,5-furandicarboxylic acid glycol copolyester, 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 polyethylene terephthalate-2,5-furandicarboxylic acid glycol copolyester foamed material with uniform bubble size and controllable foaming ratio can be obtained.

The utility model relates to dust removal equipment for solving the problem of high stripping force of a PET (Polyethylene Terephthalate) film, which is characterized by comprising a rack and an air bellow arranged on one side of the rack, a support plate is arranged on the rack, mounting side plates are arranged on two sides of one end of the support plate, a discharging roller, an upper transmission roller and a lower transmission roller are arranged between the mounting side plates, and the upper transmission roller is connected with the lower transmission roller. A supporting plate is arranged at one end of the air bellow, a winding drum is arranged at the other end of the supporting plate, the two ends of the winding drum are rotationally arranged on the vertical plates, the upper transmission roller and the lower transmission roller are oppositely arranged, a fan cover is arranged above the upper transmission roller, a suction fan is arranged on the fan cover, and the suction fan is connected with the air bellow through a pipeline. The upper driving roller and the lower driving roller are provided with the fan cover and are connected with the air bellow to absorb dust in the driving process of the upper driving roller and the lower driving roller, so that the coating effect in the subsequent process is ensured.

Provided herein are esterases (e.g., PETases) (and functional fragments, functional variants, and domains thereof), nucleic acid molecules encoding the same, and compositions comprising the same. The disclosure further relates to methods of utilizing the esterases (e.g., PETases) (or nucleic acid molecules encoding the same), including, e.g., in methods of degrading polyester containing products (e.g., plastic products).

The invention discloses a polypeptide PET (Polyethylene Terephthalate) developer targeting FGFR1 (Fibroblast Growth Factor Receptor). The structure of the polypeptide PET developer targeting FGFR1 is shown as a formula (1), r1 is a bifunctional chelating group and is selected from at least one of a formula (2) or a formula (3); Mn < + > is marked radionuclide chelated with R1; the radionuclide Mn < + > is selected from at least one of [Al18F] < 2 + >, < 68 > Ga < 3 + >, < 64 > Cu < 2 + > and < 177 > Lu < 3 + >. The structure of the FGFR1-targeted polypeptide PET imaging agent comprises polypeptide, a bifunctional chelating agent and radionuclide, the preparation method is simple and rapid, the yield is high, the PET imaging agent is good in stability, high in water solubility and high in in-vivo blood removal speed, the PET imaging agent is mainly metabolized by the kidney and can be specifically taken by a high-expression tumor site of the FGFR1, and the PET imaging agent can be widely applied to biological function imaging.

The invention relates to a method for producing polyesters in polycondensation reactions catalyzed by aluminum titanate compounds, barium titanate compounds, calcium titanate compounds, zinc titanate compounds or mixtures of these titanate compounds. The invention also relates to a composition comprising an aluminum titanate compound, a barium titanate compound, a calcium titanate compound, a zinc titanate compound or a mixture of these titanate compounds as a catalyst for the production of polyesters in polycondensation reactions. Furthermore, the invention relates to the use of an aluminum titanate compound, a barium titanate compound, a calcium titanate compound, a zinc titanate compound or a mixture of these titanate compounds as a heterogeneous polycondensation catalyst. The aluminum titanate compound, the barium titanate compound, the calcium titanate compound, the zinc titanate compound or a mixture of these titanate compounds is a non-amorphous mixed oxide of aluminum oxide (and / or barium oxide, and / or calcium oxide, and / or zinc oxide) and titanium oxide. These titanate compounds have been found to be excellent heterogeneous catalysts in polycondensation reactions for the production of polyesters, such as polyethylene terephthalate.

The invention discloses a method for preparing PET (Polyethylene Terephthalate) by polycondensation of high-purity monohydroxyethyl terephthalate under mild conditions, which comprises the following steps of: stirring and reacting monohydroxyethyl terephthalate and ethylene glycol in inert atmosphere at the temperature of 180-230 DEG C for 3-12 hours; and adding a condensation polymerization catalyst into the reaction product, and stirring and reacting for 2-6 hours in an inert atmosphere under the conditions that the temperature is 260-290 DEG C and the vacuum is 40-150 Pa to prepare PET (Polyethylene Terephthalate). According to the preparation method, high-purity monohydroxyethyl terephthalate is used as a polymerization monomer raw material, and PET which meets the current commercially available product standard and is prepared under mild conditions is explored. In addition, based on the current situation that the preparation cost of the high-purity monohydroxyethyl terephthalate is too high, the invention provides a low-cost method for preparing the high-purity monohydroxyethyl terephthalate under a mild condition.

The invention belongs to the technical field of medical biological dressings, and provides a composite dressing with oxygen release and insulin delivery functions and a preparation method thereof.The composite dressing comprises a supporting base layer, a function slow release layer and a protective film layer which are sequentially compounded from bottom to top; the supporting base layer is a medical porous polyurethane film modified by plasma; the functional sustained release layer is composed of hyaluronic acid-chitosan composite gel, oxygen release microspheres and insulin liposome; the protective film layer is a polyethylene terephthalate film of which the surface is provided with a sawtooth edge easy to tear; through an integrated three-layer patch structure, by combining the synergistic effect of PLGA microsphere controlled-release oxygen, liposome low-molecular chitosan insulin delivery and gel matrix, the skin injury microenvironment is effectively improved, inflammation is inhibited, and the healing time is shortened.

A process for producing 1,4-cyclohexanedimethanol by depolymerizing one or more recycled terephthalate-based polyesters or copolyesters via solvolysis with one or more glycols or alcohols and contacting the depolymerization product with an ester hydrogenolysis catalyst and hydrogen to produce a hydrogenolysis product and contacting the hydrogenolysis product with a hydrogenation catalyst and hydrogen to produce 1,4- cyclohexanedimethanol.

The invention relates to the technical field of a production method of a bonding type novel high-molecular PET (Polyethylene Terephthalate) flat membrane plate, in particular to a production method of a bonding type novel high-molecular PET flat membrane plate. The extrusion mechanism comprises a discharging machine, a die head is fixedly arranged at the discharging end of the discharging machine, and a discharging opening is fixedly connected to the side, away from the discharging machine, of the die head. The inner wall of the discharging port is slidably connected with a thickness adjusting mechanism, the thickness adjusting mechanism is used for adjusting and extruding PET plates with different thicknesses, a buffering mechanism is rotationally arranged on the side, close to the die head, of the thickness adjusting mechanism, and when the thickness adjusting mechanism adjusts the extrusion thickness of the discharging port, the buffering mechanism is driven to adjust the shape of a die head runner. According to the device, the limiting plates are driven to slide in the discharging opening by manually pressing down or stretching the mounting rod, the distance between the two limiting plates is adjusted according to the thickness of the PET flat film plate extruded according to the requirement, the PET flat film plates with different thicknesses are extruded, the using effect of the device is improved, and the cost is saved.

A mass spectrometry method according to the present disclosure is a mass spectrometry method in a method for discriminating whether a polyethylene terephthalate fiber contained in a target fiber is a recycled fiber. The mass spectrometry method includes a step of preparing a sample and a step of measuring the sample using matrix-assisted laser desorption / ionization mass spectrometry. The step of preparing the sample has a step of dissolving the target fiber in a first solvent to prepare a solution, a step of adding tetrahydrofuran to the solution to separate the solution into a precipitate and a supernatant, a step of obtaining the supernatant, and a step of preparing a mixed solution containing the supernatant and a matrix on a sample plate.