48 results about "Dimethyl ester" patented technology

The invention relates to the technical field of cables, and provides a corrosion-resistant control cable and a preparation method thereof. The corrosion-resistant control cable sequentially comprises a conductor, an insulating layer, a shielding layer and a sheath layer from inside to outside, wherein the sheath layer comprises the following components in parts by weight: 50-70 parts of polyvinyl chloride, 15-25 parts of ethylene propylene diene monomer, 10-20 parts of modified graphene oxide, 0.5-1.5 parts of an antioxidant, 3-5 parts of a plasticizer, 15-20 parts of a flame retardant, 2-4 parts of a compatilizer, 4-5 parts of an active agent, 1-3 parts of an assistant crosslinking agent and 1-3 parts of a crosslinking agent; wherein the modified graphene oxide is obtained by modifying graphene oxide with dimethyl 5-hydroxyisophthalate and N-hydroxymethyl acrylamide. According to the technical scheme, the problem of insufficient corrosion resistance of the control cable in the prior art is solved.

The invention discloses application of dikafen phenolic acid and ester derivatives thereof in preparation of medicines for treating pulmonary fibrosis. On an MRC-5 cell model induced by TGF-beta1, the bikafen phenolic acid and the multiple ester derivatives thereof show the activity of inhibiting alpha-SMA and COL1A1 protein expression; on a bleomycin-induced pulmonary fibrosis mouse model, the dimethyl ester derivative of the dikafen phenolic acid shows a good protective effect on experimental animals. Therefore, the dicafen phenolic acid and the ester derivative thereof have good application in the field of preparation of medicines for treating pulmonary fibrosis diseases.

The application discloses a kind of molecular sieve supported silver monatomic catalyst and its preparation method and application.The catalyst is with molecular sieve as carrier, by silver precursor salt aqueous solution is impregnated to molecular sieve, after drying and with carbon powder mixing, again be placed in joule heat in-situ heating device, at 600 DEG C~1200 DEG C high temperature pyrolysis 5~8 seconds preparation;Wherein silver element mass content is 0.2 wt%~3 wt%.The catalyst prepared by the application realizes that silver monatomic atom is highly dispersed on molecular sieve, and metal utilization rate reaches 100%.The catalyst is applied to oxalic acid dimethyl ester electrocatalytic reduction coupling preparation tartaric acid dimethyl ester reaction, and excellent catalytic performance is shown: at optimum potential, target product tartaric acid dimethyl ester selectivity is as high as 95.3%, faraday efficiency reaches 82.9%, conversion frequency reaches 1880 h ‑1 , and has excellent long-term electrochemical stability.

The utility model relates to the field of catalyst recycling technology, especially relates to a carbonic acid dimethyl ester synthesis is with catalyst recycling device. Including recovery jar, the recovery jar is installed with the stirring assembly for stirring catalyst, the recovery jar is installed with the heating assembly for heating catalyst, recovery assembly is installed on the recovery jar for recycling the hot air of discharge, the utility model discloses through the setting of recovery assembly, and the recovery jar exhausts the hot and humid gas and exchanges heat with the outside air in the heating box, and the preheating of air is carried out, thereby reducing the temperature difference of the air that advances the wind and heats to dry exhaust air, realizes the recycling of the waste heat in the hot and humid gas, reduces the energy waste that the direct discharge of heat causes, and reduces the energy consumption cost of heating process.

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 utility model relates to carbonic acid dimethyl ester production technical field, and disclose a kind of carbonic acid dimethyl ester production device of continuous feeding, the bottom surface of feed hopper is fixedly installed with conveying pipe, the inside of conveying pipe is fixedly installed with gear, the outside of gear is engaged to be connected with transmission crawler belt, the side surface of transmission crawler belt is fixedly installed with hopper, the bottom surface of conveying pipe is fixedly installed with discharge hopper, the bottom surface of discharge hopper is fixedly installed with recombinant component separation device.This carbonic acid dimethyl ester production device of continuous feeding, raw material is entered into conveying pipe by feed hopper, in conveying pipe, raw material will fall into hopper, hopper is driven by gear to transport raw material by transmission crawler belt, compared with ordinary transmission device, transmission crawler belt can adapt to bending lifting operation, and it has longer service life, and individual component can be replaced and repaired, maintenance cost is also lower in later period, hopper not only can transport solid raw material, but also can transport liquid raw material.

The invention discloses a synthesis method of N-goose deoxycholyl-L-aspartic acid and application of the N-goose deoxycholyl-L-aspartic acid in preparation of a medicine for improving metabolism-related fatty liver diseases. According to the method provided by the invention, chenodeoxycholic acid and L-dimethyl aspartate hydrochloride are taken as raw materials, and a chenodeoxycholic acid-dimethyl aspartate intermediate is synthesized, so that a target compound-N-chenodeoxycholyl-L-aspartic acid with a brand new structure is efficiently prepared. The compound shows a treatment effect superior to that of obeticholic acid (OCA) in an animal model, and can effectively improve multiple indexes such as fatty degeneration, inflammation and fibrosis of the liver. The invention provides a brand new solution for major clinical challenges of insufficient curative effect, large side effect, drug withdrawal rebound and the like of the current MAFLD treatment drug, and provides a candidate compound with a wide prospect for developing a novel efficient MAFLD treatment drug.

The invention discloses a method for quantitatively analyzing the content of dimethyl furandicarboxylate (DMFDCA) through a nuclear magnetic resonance hydrogen spectrum technology, which adopts an internal standard substance ethylparaben which meets the national standard and does not react with a standard substance to directly measure the content of the main component DMFDCA in the standard substance. The method comprises the following steps: dissolving ethylparaben and DMFDCA in deuterated dimethyl sulfoxide DMSO-d6 to obtain a solution to be detected, optimizing test parameters, determining a nuclear magnetic resonance hydrogen spectrum of the solution to be detected, selecting proper quantitative peaks of ethylparaben and DMFDCA, respectively integrating the quantitative peaks of ethylparaben and DMFDCA to obtain integral areas, and calculating the actual content of DMFDCA according to a formula. The method has the characteristics of simplicity, feasibility, low cost, good stability, high precision, strong specificity and the like, and has wide application prospects in the aspects of standard substance calibration, intermediate check and the like.

The application provides a 2-amino terephthalic acid dimethyl ester-tetracyano benzene eutectic crystal as well as a preparation method and application thereof, the eutectic crystal is of a triclinic system, a space group is a cell parameter is alpha = 95.041 (2) °, beta = 90.337 (2) °, gamma = 97.670 (2) °, and a cell volume is The 2-amino terephthalic acid dimethyl ester-tetracyano benzene eutectic crystal provided by the application increases the solid melting point of the organic compound from 133.39 DEG C to 162.23 DEG C without changing the covalent bond of the compound, enhances the thermal stability, and meanwhile, the fluorescence emission color, the fluorescence lifetime and the quantum yield are obviously changed.

The invention discloses a polyurethane resin modified acetic acid-propionic acid emulsion as well as a preparation method and application thereof, and belongs to the technical field of emulsions for glass fibers. The emulsion is prepared from the following raw materials in parts by weight: 200 to 300 parts of butyl acrylate, l70 to 210 parts of vinyl acetate, 10 to 15 parts of methacrylic acid, 8 to 15 parts of dimethyl ester, 5 to 10 parts of polyurethane resin, 5.0 to 6.0 parts of nonionic emulsifier, 4.0 to 5.0 parts of anionic emulsifier, 0.5 to 1.5 parts of initiator, 0.4 to 0.9 part of sodium bicarbonate and 350 to 400 parts of water. The preparation method comprises the following steps: (1) weighing the raw materials; (2) heating, stirring and dispersing the nonionic emulsifier, the anionic emulsifier and part of water to obtain a pre-emulsion; and (3) firstly stirring butyl acrylate, vinyl acetate, methacrylic acid, dimethyl ester and polyurethane resin, then adding the rest water and sodium bicarbonate, continuously stirring, heating, adding an initiator for reaction, finally dropwise adding the pre-emulsion, keeping the temperature and cooling to obtain the water-based adhesive. And polyurethane is used for modification, so that the water resistance and the heat resistance of the modified glass fiber are improved, and the modified glass fiber has excellent performance when being used on the glass fiber.

The invention discloses a preparation method and application of metal organic framework immobilized ligase. The immobilized enzyme is prepared by encapsulating a high-performance ligase mutant Q186G / S328A with an amino acid sequence as shown in SEQ ID NO: 2 into a ZIF-8 framework in situ. The immobilized enzyme has high catalytic activity and high alpha-regioselectivity of the mutant and excellent stability brought by ZIF-8 encapsulation. When being used for catalyzing condensation of L-aspartic acid-alpha, beta-dimethyl ester and L-phenylalanine to prepare an aspartame key intermediate alpha-AMP, the alpha-AMP has the conversion rate, selectivity and operation stability which are superior to those of free enzyme, and can be recycled for multiple times while the activity is kept good. The invention provides a brand-new enzyme catalysis process for green, efficient, economical and industrial synthesis of aspartame.

The invention provides a carbonized resin decolorizing and refining method for mixed dibasic acid dimethyl ester, and belongs to the technical field of chemical separation and purification. According to the technical scheme, spherical carbonized resin formed by carbonizing styrene-divinyl benzene polymer resin is used as an adsorbent, and a colored crude product DBE is subjected to decoloration treatment through a fixed bed process. The carbonized resin has extremely high selective adsorption capacity and adsorption rate on colored impurities in DBE, the Pt-Co color number of the carbonized resin can be reduced from 50 or above to 10 or below, the decolorization rate exceeds 80%, and meanwhile the yield of the DBE product reaches 99% or above. And the resin saturated by adsorption is easy to regenerate and can be repeatedly used. The method is simple in process, efficient and environment-friendly, overcomes many defects of a traditional activated carbon decoloration method, and is particularly suitable for industrial refining production of DBE.

The application relates to the technical field of organic synthesis, and particularly relates to a preparation method of omega-amino fatty acid methyl ester and long-chain nylon. The preparation method of the omega-amino fatty acid methyl ester specifically comprises the following steps: S1, ester exchange: long-chain dibasic acid dimethyl ester, methanol and a first organic solvent are mixed in the presence of a first catalyst, and the long-chain dibasic acid monomethyl ester is obtained through an ester exchange reaction; S2, ammonia addition: the long-chain dibasic acid monomethyl ester is used as a raw material, an amidation reaction is carried out, and then a reduction reaction is carried out to obtain the omega-amino fatty acid methyl ester, wherein n is greater than or equal to 8. The preparation method has the characteristics of a short process route and stable intermediates, can be suitable for batch production, and can also be suitable for continuous production.

The invention discloses a synthesis method and a synthesis system of erythritol. The synthesis method of the erythritol comprises the following steps: contacting dimethyl oxalate and methyl glycolate with a condensation catalyst to carry out condensation reaction, and carrying out hydrogenation reaction on the obtained condensation intermediate and hydrogen under the action of a hydrogenation catalyst to obtain the erythritol. According to the method disclosed by the invention, the erythritol with high additional value can be prepared through two steps of condensation and hydrogenation, and the yield of the erythritol can be obviously improved.

The present application relates to Cu-based multimetallic catalyst and preparation method and application in the preparation of binary amine by the amination of binary acid / dimethyl ester compound; the catalyst is Cu 0 -Cu⁺‑M X , M is one or more metal elements selected from one or more of Zn, Al, Cu 0 Coexist with Cu⁺ in the form of bivalent state; the catalyst preparation method is simple, the raw material is cheap, and the catalyst can be reused, and after 5 cycles, the catalytic performance remains stable, and the conversion rate and yield decrease less than 5%; it is suitable for one-pot reduction amination reaction of binary acid and dimethyl ester, and high-efficiency conversion is realized under mild conditions, and the product yield and selectivity are significantly higher than those of traditional single-metal catalyst. The product is directly subjected to GC-MS and FID qualitative and quantitative analysis; the product yield is high, the yield of nonanediamine and decanediamine reaches 99.9%, and the problem of difficult reaction selectivity control, many side reactions and complex product distribution in the prior art is solved.

The present invention relates to the technical field of wastewater biochemical treatment, particularly to a dimethyl ester production wastewater biochemical treatment apparatus, which comprises a biochemical box, the upper end of the biochemical box is fixedly provided with a box cover, and the interior of the biochemical box is divided into an anaerobic zone, an aerobic zone, an adsorption zone and a water outlet zone through a first partition plate, a second partition plate and a third partition plate, an aeration head is arranged in the aerobic zone, a gas conveying pipe extending to the outer side of the box cover is arranged at the upper end of the aeration head, the wastewater biochemical treatment device further comprises a wave blocking mechanism and a turning mechanism, and the wave blocking mechanism is arranged in the aerobic zone and used for inhibiting water surface fluctuation caused by oxygenation of the aeration head in the aerobic zone. Water surface fluctuation caused by aeration is effectively inhibited, the water level and overflow flow of an aerobic zone are stabilized, meanwhile, it is guaranteed that strain culture mud is always immersed in wastewater through a floating structure, exposure failure is avoided, the biochemical degradation efficiency is improved, and strain loss is reduced.

The invention discloses a process for preparing and purifying dimethyl 2, 6-naphthalate, which adopts an integrated system comprising a pulping tank, an esterification kettle, a methanol-water separation tower and a product rectifying tower, and comprises the following steps: pulping 2, 6-naphthalic acid (2, 6-NDA), a catalyst and methanol in the pulping tank, and pumping into the esterification kettle for methyl esterification reaction; and continuously moving out and separating water generated in the reaction and methanol azeotrope, wherein the methanol is recycled. And then feeding a crude ester mixture obtained by the reaction into a product rectifying tower to perform vacuum rectification, obtaining a high-purity 2, 6-NDC product at the tower top, and returning an intermediate-rich material in the tower kettle to the esterification kettle to continue the reaction. According to the method, the problems of equipment corrosion, high energy consumption and serious pollution in the prior art are effectively solved, the methanol solvent and unreacted substances are recycled, the purity of the final product is greater than 99%, and the process flow is efficient, environment-friendly and low in cost.

The invention relates to the technical field of catalyst preparation, and discloses a preparation method of a high-dispersion copper-based catalyst and application of the high-dispersion copper-based catalyst in preparation of CHDM, the preparation method comprises the following steps: (1) adding a copper salt, a manganese salt, an aluminum salt and a rare earth metal salt into water, and dissolving to obtain a mixed salt solution; sodium hydroxide and sodium carbonate are added into water to be dissolved, and a mixed alkali solution is obtained; (2) reacting the mixed salt solution and the mixed alkali solution in a micro-liquid membrane reactor, after the reaction is completed, carrying out crystallization reaction on the obtained suspension, and then centrifuging and drying to obtain a quaternary hydrotalcite precursor; and (3) roasting and reducing the quaternary hydrotalcite precursor to obtain the copper-based catalyst. According to the copper-based catalyst, Cu nanoparticles are highly dispersed on the surface of a composite metal oxide, the copper-based catalyst is applied to 1, 4-cyclohexanedicarboxylic acid dimethyl ester reaction hydrogenation for preparing 1, 4-cyclohexanedimethanol, excellent catalytic activity and stability are shown, and CHDM has a high trans-cis ratio.

A method for the production of 2,5-furandicarboxylic acid (FDCA) comprising contacting glucose with a catalyst composition under conditions suitable for the formation of glucarate; acidifying glucarate to form glucaric acid; dehydrating glucaric acid to form FDCA; and recovering FDCA. A method for the production of 2,5-furan dicarboxylic acid dimethyl ester (FDME) comprising contacting glucose with a catalyst composition under conditions suitable for the formation of glycolaldehyde; contacting glycolaldehyde with a transition metal oxidation catalyst under conditions suitable for the formation of glucaric acid; esterifying glucaric acid to form glucaric acid methyl ester; dehydrating the glucaric acid methyl ester to form FDME; and recovering FDME.

The present application relates to a kind of coal chemical industry wastewater multistage processing method, belong to wastewater treatment technical field.The organic matter removal agent in the coal chemical industry wastewater multistage processing method of the present application has good removal effect to multiple organic matters (including lipophilic organic matter volatile phenol, thiophene, pyridine, quinoline, furan, naphthalene, anthracene, phenanthrene and hydrophilic organic matter carbazole, indole and pyrrole) in coal chemical industry wastewater of different pH.The coal chemical industry wastewater multistage processing method of the present application is not sensitive to the pH of wastewater, and the applicability is wider, can process multiple different pH wastewater, save pretreatment step, reduce processing cost.The carbonic acid dimethyl ester and amide oxime in the organic matter removal agent in the coal chemical industry wastewater multistage processing method of the present application have synergistic effect, both can play synergistic effect, improve the removal rate of multiple organic matters in coal chemical industry wastewater.

The application relates to the technical field of cables, and discloses a kind of corrosion-resistant control cables and preparation methods thereof.A kind of corrosion-resistant control cable includes conductor, insulating layer, shielding layer, sheath layer from inside to outside in sequence, sheath layer includes the following components by weight: polyvinyl chloride 50-70 parts, ethylene-propylene-diene rubber 15-25 parts, modified graphene oxide 10-20 parts, antioxidant 0.5-1.5 parts, plasticizer 3-5 parts, flame retardant 15-20 parts, compatibilizer 2-4 parts, active agent 4-5 parts, crosslinking aid 1-3 parts, crosslinking agent 1-3 parts; wherein, modified graphene oxide is obtained by modifying graphene oxide with 5-hydroxy isophthalic acid dimethyl ester and N-hydroxymethyl acrylamide.The above technical solution solves the problem of insufficient corrosion resistance of control cables in related technologies.

The application provides a 2-amino terephthalic acid dimethyl ester eutectic crystal as well as a preparation method and application thereof, the eutectic crystal is of a triclinic system, a space group is, a cell parameter is, alpha = 100.928 (2) °, beta = 98.038 (2) °, gamma = 106.164 (2) °, and a cell volume is 0. 734 0 (3) nm3. The 2-amino terephthalic acid dimethyl ester-tetracyano benzene eutectic crystal provided by the application increases the solid melting point of the organic compound from 133.39 DEG C to 161.80 DEG C without changing the covalent bond of the compound, enhances the thermal stability, and meanwhile, the fluorescence emission color, the fluorescence lifetime and the quantum yield are all changed.

The invention relates to the technical field of synthesis, and provides a synthesis method of dimethyl 2, 6-naphthalate, which comprises the following steps: S1, preheating 2, 6-naphthalic acid and methanol, feeding into a high-pressure kettle, adding a catalyst, reacting in the high-pressure kettle, and filtering to obtain a liquid material; s2, cooling and crystallizing the liquid material, recrystallizing, and rectifying to obtain 2, 6-dimethyl naphthalate; the catalyst is a supported catalyst. According to the technical scheme, the problem that the yield and the purity of the dimethyl 2, 6-naphthalate in the prior art need to be improved is solved.

The application provides a preparation method of co-production of 3-hydroxypropionic acid methyl ester and terephthalic acid dimethyl ester, comprising the following steps: S1, carrying out halogenation reaction on a first material containing terephthalic acid ethylene glycol ester, a halogen-containing compound and an acidic catalyst to obtain halogenated terephthalic acid ethylene glycol ester; S2, carrying out a first reaction on a second material containing the halogenated terephthalic acid ethylene glycol ester, a cobalt catalyst, a ligand and an alkaline additive in the presence of carbon monoxide to obtain 3-hydroxypropionic acid methyl ester and terephthalic acid dimethyl ester. The application can realize high-value conversion of terephthalic acid ethylene glycol ester, and simultaneously efficiently co-produce 3-hydroxypropionic acid methyl ester and terephthalic acid dimethyl ester.

The invention discloses a 3D NAND deep hole structure etching solution. The etching solution comprises a dimethyl ester substance, phosphoric acid and water. In the wet etching process of the 3D NAND memory chip, a lateral etching phenomenon is sometimes generated, so that the etching rate of the bottom is greater than that of the top, and the etching solution can enable the etching rate of the top to be greater than that of the bottom by adding formamidine substances, so that the problem is effectively solved.

The invention discloses a ligase mutant and application thereof in synthesis of aspartame. The mutant is obtained by rational design and site-specific mutagenesis of natural ligase, and the amino acid sequence of the mutant is shown as SEQ ID NO.8. The invention also discloses a preparation method of the ligase mutant. Compared with a wild type, the mutant shows significantly enhanced catalytic activity and alpha-regioselectivity to substrates L-aspartic acid-alpha, beta-dimethyl ester and L-phenylalanine, and can efficiently catalyze to generate an aspartame key intermediate alpha-AMP. The invention further provides an aspartame-chemical synthesis method which does not need amino protection and has simplified steps, and high-purity aspartame can be obtained at high yield through enzymatic condensation, subsequent mild hydrolysis and isoelectric point crystallization. The process route is green and economical, and a new strategy is provided for industrial production of aspartame.

The present application relates to the technical field of high polymer material, and more particularly to a preparation method of nylon 11, comprising the following steps: methyl esterification: dodecanedioic acid is dissolved in methanol, and dodecanedioic acid dimethyl ester is synthesized by dehydration under the action of a first catalyst; ester exchange: dodecanedioic acid dimethyl ester, dodecanedioic acid and methanol are dissolved in an organic solvent, a second catalyst is added, and dodecanedioic acid monomethyl ester is prepared by refluxing reaction in the organic solvent; ammonia addition: 11-amino-undecanoic acid is prepared by taking dodecanedioic acid monomethyl ester as a raw material and through amide reaction and Hoffmann rearrangement; and polymerization: PA11 is obtained by high-temperature polymerization of 11-amino-undecanoic acid under nitrogen protection. The preparation method has the characteristics of short process route and stable intermediates, and can be suitable for batch production and continuous production.

The application discloses a kind of wide voltage wide temperature range sodium ion battery electrolyte and preparation method and application thereof, belong to sodium ion battery electrolyte technical field, include sodium salt, organic solvent and additive, the organic solvent is selected from one or more of carbonic acid ethylene ester, carbonic acid propylene ester, carbonic acid methyl ethyl ester, carbonic acid dimethyl ester, carbonic acid diethyl ester, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, the additive is selected from one or more of fluoro carbonic acid ethylene ester, propylene group-1,3-propyl sulfone lactone, 1,3-propyl sulfone lactone, methane disulfonic acid methylene ester, ethylene sulfate, trifluoromethanesulfonic anhydride, pentaerythritol double ring sulfuric acid ester, tris (trimethylsilyl) phosphate, tris (trimethylsilyl) phosphite, tris (trimethylsilyl) borate, acetylsulfanilic acid sodium, aluminium triflate, the electrolyte of the application not only maintains higher coulomb efficiency at low temperature, has better cycle stability at higher temperature.

The application provides 4-aminoisophthalic acid dimethyl ester-tetracyano benzene eutectic, a preparation method and application thereof, the 4-aminoisophthalic acid dimethyl ester-tetracyano benzene eutectic is triclinic system, the space group is, the cell parameter is, alpha = 116.628 (2) °, beta = 99.297 (2) °, gamma = 100.912 (2) °, the cell volume is the 4-aminoisophthalic acid dimethyl ester-tetracyano benzene eutectic provided by the application improves the solid melting point of 4-aminoisophthalic acid dimethyl ester organic compound without changing the covalent bond of the compound, enhances the thermal stability, and realizes the regulation of fluorescence emission performance.

The invention discloses a low-yellowing regenerated PET (Polyethylene Terephthalate) material as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. When the low-yellowing regenerated PET material is prepared, waste polyester is subjected to alcoholysis with ethylene glycol and then subjected to ester exchange with methanol, and regenerated dimethyl terephthalate is prepared; carrying out polymerization on the regenerated dimethyl terephthalate, the functionalized dimethyl ester, 2-vinyl-propane-1, 3-diol and ethylene glycol to prepare regenerated PET (Polyethylene Terephthalate); the regenerated PET and furfuryl mercaptan are subjected to a reaction, and modified regenerated PET is prepared; the preparation method comprises the following steps: sequentially reacting apigenin with isophorone diisocyanate and N-(2-aminoethyl) maleimide to obtain modified apigenin; uniformly mixing the modified regenerated PET and the modified apigenin, and performing extrusion molding to obtain the low-yellowing regenerated PET material. The low-yellowing regenerated PET material prepared by the invention has the advantages of yellowing resistance, ultraviolet resistance and self-healing.