1292 results about "Butanedioic acid" patented technology

The invention discloses acid-resistant pichia kudriavzevii and an application of the acid-resistant pichia kudriavzevii. The acid-resistant pichia kudriavzevii is Pichia kudriavzevii S9 and is preserved in the Guangdong Microbial Culture Collection Center on September 20, 2024, and the preservation number of the acid-resistant pichia kudriavzevii S9 is GDMCC.No: 65148. The acid-resistant pichia kudriavzevii S9 has the advantages that the acid-resistant pichia kudriavzevii S9 is used for According to the invention, a low-pH-resistant pichia kudriavzevii strain is screened from surface microorganisms of grapes, and the pichia kudriavzevii strain can tolerate an environment with pH of 1.8 and ferment organic acid under the condition of not adding a neutralizing agent; besides, genetic modification is carried out based on pichia kudriavzevii, including knocking out succinic acid degradation related genes, knocking out ethanol and glycerol production pathways and enhancing succinic acid transporter expression, so that engineering bacteria for high-yield succinic acid are obtained, and the fermentation yield of succinic acid reaches 31.74 g / L under the condition that a neutralizer is not added.

The invention relates to the field of membrane materials, and discloses an epoxy modified starch-based degradable membrane and a preparation method thereof, the epoxy modified starch-based degradable membrane comprises epoxidized starch, modified nanocellulose and a plasticizer; the modified nano cellulose is prepared by mixing a modified composite filler, a nano cellulose dispersion liquid and a zinc acetate dihydrate aqueous solution; the nano-cellulose dispersion liquid is prepared by adhering polytannic acid formed by oxidation and self-polymerization of tannic acid to the surface of nano-cellulose; the modified composite filler is prepared by performing carboxylation modification on nano titanium dioxide coated fumed silica nanoparticles by using succinic anhydride and gamma-aminopropyltriethoxysilane, then reacting with polyethyleneimine to obtain an aminated composite filler, and finally grafting glycidyl dodecyl dimethyl ammonium chloride to the surface of the aminated composite filler. The prepared film material is high in tensile strength, has certain hydrophobicity, and has good heat resistance, antibacterial property and flame retardant property.

The invention discloses a nano blocking agent for drilling fluid and a preparation method thereof, and belongs to the technical field of blocking agents, the nano blocking agent for drilling fluid is prepared by reaction of a core layer blocking agent and a shell layer blocking agent, the core layer blocking agent is prepared by reacting nano silicon dioxide, gamma-methacryloxypropyltrimethoxysilane and a first part of vinylphosphonic acid, and has secondary blocking capability; and the shell blocking agent is prepared by reacting a second part of vinyl phosphonic acid, styrene and 2-dodecene-1-yl succinic anhydride, and has the characteristic of flexibility. The nano plugging agent has rigid supporting and flexible deformation capabilities, and the high-temperature stability and compressive strength of a plugging layer are remarkably improved. The chemical binding force of the plugging agent and the rock is enhanced; the hydrolysable methoxyl reserved in the core layer provides a secondary plugging function, and the plugging validity period is prolonged. The invention relates to a preparation method of a nano blocking agent for drilling fluid, which is used for preparing the nano blocking agent for drilling fluid.

The present invention belongs to the technical field of biomedical materials. Disclosed are a methacrylate, a succinate-diesterified starch, a preparation method therefor and the use thereof in an in-situ filler for corneal defects. The methacrylate, succinate-diesterified starch is prepared by means of performing graft carboxylation on starch and then grafting a double bond. The in-situ filler for corneal defects consists of the methacrylate succinate-diesterified starch (StacMA), gelatin methacryloyl (GelMA), a photoinitiator and a solvent. The corneal filler has a good biocompatibility, an excellent photoresponsive adhesion property and excellent mechanical properties, and can be used for promoting the regeneration of the natural structure of a damaged cornea and the reconstruction of visual function.

The invention discloses a carbon fiber surface treatment process, which belongs to the technical field of organic synthesis, and comprises the following steps: S1, taking melamine, adding into tetrahydrofuran, adding carboxylated carbon fiber and a condensing agent, heating to 50-60 DEG C, stirring for 3-4 hours, washing, and drying to obtain melamine modified carbon fiber; s2, adding nano silicon dioxide into DMF (Dimethyl Formamide), performing ultrasonic treatment, adding a silane coupling agent KH550 and succinic anhydride, stirring for 3-5 hours, washing and drying to obtain modified silicon dioxide; and S3, adding the modified silicon dioxide into DMF, adding the melamine modified carbon fiber and a condensing agent, heating to 90-100 DEG C, stirring for 4-5 hours, washing, and drying to obtain the surface-treated carbon fiber. The silane coupling agent KH550 and butanedioic anhydride are used for carboxylation modification of nano silicon dioxide, melamine is used as a coupling agent, nano silicon dioxide is grafted on carbon fibers, surface defects on the surfaces of the carbon fibers can be filled, and therefore the mechanical performance of the carbon fibers is improved.

The invention relates to the technical field of biodegradable materials, and particularly discloses a BBM-added bamboo powder biodegradable material and application thereof in beer bottles. The BBM-added bamboo powder biodegradable material is prepared from the following raw materials in parts by mass: 10 to 20 parts of poly (butylene succinate), 10 to 30 parts of poly (butylene adipate-co-terephthalate), 10 to 20 parts of bamboo powder, 1 to 3 parts of dopamine hydrochloride, 0.1 to 0.5 part of n-butylamine, 1 to 2 parts of hexadecyl trimethyl ammonium bromide, 1 to 5 parts of tetraethyl orthosilicate and 1 to 2 parts of tetrabutyl titanate. 1-2 parts of 3-aminopropyltriethoxysilane, 1-2 parts of an antioxidant and 1-2 parts of a plasticizer. The BBM obtained by the invention has excellent mechanical properties, improves the anti-ultraviolet intensity of a degradable material to a certain extent, and has very good biodegradability.

The invention provides a succinic acid composition as well as polyester and a polyester composite material prepared from the succinic acid composition. The succinic acid composition comprises succinic acid, a compound containing sulfate radicals and a phosphorus compound, the mass content of sulfate radicals in the succinic acid composition is 240 to 500 ppm; the mass content of the phosphorus element in the succinic acid composition is 0.5 to 40 ppm. According to the present invention, by compounding the sulfate radical-containing compound and the phosphorus compound with the specific content, the polyester is prepared by using the succinic acid composition as the raw material, such that the production efficiency of the polyester can be ensured, the polyester with characteristics of low acid value and high viscosity can be obtained, and the corrosion of the polyester or the composition thereof on the metal equipment can be reduced during the polyester composite material extrusion process; the quality of the polyester composite material is ensured.

The invention provides a recombinant pichia kudriavzevii strain and application thereof, pichia kudriavzevii is taken as an original strain, and a reduced TCA pathway is introduced and comprises the following steps: overexpressing fumarate reductase FRD in the strain; weakening or inactivating an ethanol pathway, comprising: knocking out any one or a combination of at least two of encoding genes of ethanol dehydrogenase ADH1, ADH3 or ADH6; enhancing the PPP pathway in the pentose phosphate pathway of the strain, including: overexpressing glucose-6-phosphate dehydrogenase ZWF1 and / or 6-phosphogluconate dehydrogenase GND1; the method for reducing the activity of the malate dehydrogenase MDH2 in the TCA circulation pathway comprises the step of knocking out the coding gene of the malate dehydrogenase MDH2 in the TCA pathway. The pichia kudriavzevii is modified by using genetic engineering and metabolic engineering methods, so that the yield and the yield of succinic acid are increased, and the pichia kudriavzevii has important application prospects in industrial production.

The invention discloses a high-barrier antibacterial packaging material, a preparation method thereof and a packaging bag, and belongs to the technical field of packaging, the packaging material comprises the following raw materials by weight: 75-85 parts of polylactic acid, 15-25 parts of poly (butylene succinate), 2-6 parts of epoxidized urushiol, and 1-3 parts of benzyl quaternary ammonium salt modified montmorillonite; the epoxidized urushiol is prepared by carrying out epoxidation reaction on urushiol and organic peroxy acid; the packaging material further comprises the following raw materials: 2-5 parts of sepiolite fiber loaded magnesium oxide; according to the invention, biodegradable polylactic acid and poly (butylene succinate) are taken as base materials, and epoxidized urushiol is taken as a reactive compatilizer, so that the compatibility between polylactic acid and poly (butylene succinate) is improved, and meanwhile, the binding property between a polymer matrix and benzyl quaternary ammonium salt modified montmorillonite and sepiolite loaded magnesium oxide is enhanced; the packaging material with good mechanical property, barrier property and antibacterial property is obtained.

The invention belongs to the technical field of degradable plastics, and particularly relates to an environment-friendly degradable plastic and a preparation method thereof. The PBS / PBS composite material is prepared from the following components in parts by weight: 30 to 50 parts of PBS; 70 to 90 parts of polylactic acid (PLA); cTAB (cetyltrimethyl ammonium bromide) modified CuCexFe (1-x)-LDH (layered double hydroxide), wherein x is equal to 0.02 to 0.04 to 8 to 12 parts; 3-7 parts of sorbic acid; and 3-5 parts of a chain extender. According to the environment-friendly degradable plastic, the antibacterial property of the plastic can be improved by adding the hydrotalcite-like compound, the antibacterial property of the plastic can be further improved by adding Ce and modifying CTAB, and the antibacterial property of the environment-friendly degradable plastic is more excellent by compounding the hydrotalcite-like compound and sorbic acid. The environment-friendly degradable plastic prepared by the invention has good mechanical properties.

The invention discloses an enzyme response type KRAS targeted protein degradation chimera as well as a preparation method and application thereof, and belongs to the technical field of tumor targeted therapy. The enzyme response type KRAS targeted protein degradation chimera disclosed by the invention is obtained by covalently linking three parts, namely a KRAS targeted protein degradation chimera, an enzyme response type amino acid sequence and a cell penetrating peptide amino acid sequence, wherein the KRAS targeted protein degradation chimera is obtained by linking a KRAS targeted peptide and a VHL E3 ligase ligand through succinic acid. The enzyme response type KRAS targeted protein degradation chimera releases the KRAS targeted protein degradation chimera under the action of ATG4 enzyme shearing, and shows a relatively strong lung cancer resisting effect in vitro and in vivo. The invention has significant advantages in the aspect of antitumor drugs, and opens up a new field for the development of targeted protein degradation chimera drugs. Enzyme response type KRAS targeted protein degradation chimera molecular structural formula as follows: # imgabs0 #

The invention discloses a biodegradable polylactic acid composite material and a preparation method thereof, and relates to the technical field of polylactic acid materials. The method comprises the steps that firstly, chitosan activated through hydrochloric acid is subjected to graft modification through a KH550 silane coupling agent, meanwhile, nano-zinc oxide is subjected to surface modification through stearic acid, the chitosan and the nano-zinc oxide are mixed, spray drying is conducted, and antibacterial composite powder is prepared; the preparation method comprises the following steps: performing hydrochloric acid activation and KH570 silane coupling agent modification on nano silicon dioxide, performing hydroxypropylation modification on alkali lignin, and performing reflux crosslinking reaction on the modified alkali lignin, KH570 modified nano silicon dioxide, polycaprolactone, methyl methacrylate and azodiisobutyronitrile to prepare a heat-resistant reinforcer; uniformly mixing polylactic acid, poly (butylene succinate), the antibacterial composite powder, the heat-resistant reinforcer, tributyl citrate, polyethylene glycol and talcum powder, and extruding and granulating by using a twin-screw extruder to obtain the heat-resistant antibacterial material. The composite material prepared by the invention has excellent antibacterial property, heat resistance and biodegradability.

The invention discloses a composite degradable modified atmosphere preservative film, preparation and application thereof and a cherry preservation method. The preparation method comprises the following steps: mixing copolyester PBTF, poly (butylene adipate-succinate)-terephthalate and a solvent to obtain a film casting solution, pouring the film, and drying to obtain the composite degradable modified atmosphere preservative film. The preservative film has the characteristics of high CO2 permeability and low O2 permeability, and can inhibit respiration of fruits and vegetables and slow down metabolism of the fruits and vegetables, so that the storage time is prolonged, the composite degradable controlled atmosphere preservative film is heat-sealed into a bag and is used for preserving Dalian cherries, and an excellent preservation effect can be achieved.

The invention relates to the technical field of welding materials, and discloses washable semiconductor solder paste and a preparation method and application thereof. The washable semiconductor solder paste comprises scaling powder and tin powder, wherein the mass ratio of the scaling powder to the tin powder is 1: (8-9.6); the soldering flux comprises the following raw material components: a film-forming agent, composite organic acid, a thixotropic agent, a surfactant, an antioxidant and a solvent, wherein the composite organic acid is composed of succinic acid and glutaric acid according to the mass ratio of (1-3): (1-2.5). According to the washable semiconductor solder paste, the particle size, the melting point and the alloy components of the tin powder are controlled, composite organic acid composed of succinic acid and glutaric acid in a specific proportion is adopted in the soldering flux, and other components are matched with one another; the tin powder and the soldering flux in a specific mass ratio are combined, so that the prepared washable semiconductor solder paste is good in wettability, the expansion rate is larger than or equal to 85%, the storage life reaches 3 months, and the washable semiconductor solder paste can be directly cleaned with water after being welded and is high in corrosion resistance and oxidation resistance.

The invention provides a method for producing succinate by using maleic anhydride airflow. The method comprises the following two reaction processes: absorbing esterified maleic anhydride airflow by using RR1R2COH alcohol as an absorption solvent to prepare butenedioic acid ester, and hydrogenating the butenedioic acid ester under the action of a metal catalyst to prepare the succinate. According to the technical scheme, the alcohol substances are used as the solvent and the esterifying agent, succinic acid ester can be prepared by carrying out absorption esterification on maleic anhydride gas flow and directly hydrogenating the absorption liquid without separation, raw materials are cheap, the process is short, the system is simple and convenient, investment is saved, material consumption and energy consumption are low, and the production cost is low.

The invention provides a tubular reaction device for succinic acid type polycarbonate polyether polyol, which is characterized in that a specific premixing unit and the structure and parameters of a reaction unit are designed in the tubular reaction device, and the premixing unit mixes all raw materials in a carbon dioxide bubbling manner; a tubular reactor in the reaction unit is provided with a dispersing sheet with a specific shape and holes, the one-time feeding production process of the succinic acid type polycarbonate polyether polyol is realized through cooperative control of a device structure and process parameters, the process steps are reduced, the process time is shortened, and the production efficiency is improved. The problems that in the prior art, succinic acid type polycarbonate polyether polyol is wide in molecular weight distribution, obviously large in molecular weight ratio target value and prone to implosion are solved, the succinic acid type polycarbonate polyether polyol is narrow in molecular weight distribution, the difference between the actual product molecular weight and the target theoretical value is small, the production process is safe, implosion is avoided, and the method is suitable for industrial production. And the method is suitable for industrial large-scale production.

The invention relates to the field of coatings, and discloses a biomass-based oil-resistant coating and a preparation method thereof, the coating comprises an additive solution, a paraffin solution and gallic acid; the paraffin solution is obtained by dissolving paraffin in absolute ethyl alcohol; a preparation method of the additive solution comprises the following steps: mixing chitosan powder and an acetic acid aqueous solution to prepare a chitosan solution, ultrasonically dispersing functionalized montmorillonite in deionized water to prepare a suspension, then uniformly mixing the chitosan solution and the suspension, adding modified phytic acid prepared by grafting phytic acid and ethylene glycol diglycidyl ether, and stirring to react; the functional montmorillonite is prepared by modifying modified montmorillonite with titanium dioxide and zinc oxide, then activating the modified montmorillonite with 3-aminopropyltriethoxysilane and succinic anhydride, and then carrying out a ring-opening reaction with glycidyl neodecanoate. The coating prepared by the invention has high water resistance, the Kit oil-proof grade is kept at grade 12, and the oil-proof performance of the coating is greatly improved. Meanwhile, the antibacterial performance, the tensile index and the ultraviolet aging resistance are relatively high.

The invention relates to the technical field of in-vitro diagnostic kits, in particular to carboxyl polystyrene microspheres, a preparation method and application of the carboxyl polystyrene microspheres in a kit for quantitatively detecting MxA. The preparation method of the carboxyl polystyrene microspheres comprises the steps that firstly, polystyrene microspheres with the surface rich in aldehyde groups are prepared through a soap-free emulsion polymerization method; then carrying out a Schiff alkali reaction with 2-aminoethyl methacrylate hydrochloride to carry out double bond modification on the surface of the microsphere, and meanwhile, improving the hydrophilicity of the microsphere by an ester group and an imino group; and finally, carrying out sulfydryl-double bond addition reaction on the polystyrene microspheres and mercaptosuccinic acid to generate the polystyrene microspheres rich in carboxyl on the surfaces. The carboxyl polystyrene microspheres prepared by the invention can improve the binding efficiency of latex and an MxA antibody, so that the detection sensitivity is improved, the purpose of high-sensitivity quantitative detection of MxA protein can be achieved, and the detection time is greatly shortened.

The invention relates to bio-based 1, 4-butanediol and a preparation method thereof, and belongs to the technical field of chemical raw material synthesis. The preparation method of the bio-based 1, 4-butanediol comprises the following steps: preparing a bio-based 1, 4-succinic acid solution; continuously feeding the obtained bio-based 1, 4-succinic acid solution and hydrogen into a fixed bed containing a first-stage nickel-copper catalyst, and carrying out hydrogenation reaction to obtain a first-stage product; continuously feeding the obtained first-stage product and hydrogen into a fixed bed containing a second-stage nickel-copper catalyst, and carrying out hydrogenation reaction to obtain a second-stage product; and feeding the obtained second-stage product into a separation tower for separation and purification to obtain the bio-based 1, 4-butanediol. According to the method, the polymer-grade bio-based 1, 4-butanediol is prepared through continuous liquid phase hydrogenation of the bio-based 1, 4-succinic acid, the purity of the obtained polymer-grade bio-based 1, 4-butanediol is larger than or equal to 99.90%, and the product does not contain methyl-1, 4-butanediol and does not contain 2-(4-hydroxybutoxy)-tetrahydrofuran.

The invention relates to the technical field of oilfield chemistry, in particular to a glycosyl anionic surfactant and a preparation method and application thereof, and the glycosyl anionic surfactant is prepared from glucose, long-chain alkyl primary amine and succinic anhydride sodium hydroxide. The glycosyl anionic surfactant has excellent surface activity, is simple in preparation method, high in product yield, safe and reliable, can be used for oil displacement agents, polymer surface oil displacement agents, emulsifiers, discharge aiding agents, heavy oil viscosity reducers and the like, is wide in application, and meets the green development requirements of oil fields. The acid fracturing discharge aiding agent using the glycosyl anionic surfactant as a raw material can effectively reduce the surface and interfacial tension of an aqueous solution, and meets the technical specification of the acid fracturing discharge aiding agent.

The invention relates to the technical field of plastics, in particular to a high-strength antibacterial plastic packaging bottle and a preparation method thereof.The preparation method comprises the steps that polylactic acid, poly (butylene succinate), epoxidized soybean oil and composite zinc oxide are mixed, extruded, granulated and blow-molded, and a base part is obtained; mesoporous nano-zinc oxide is used as a carrier to carry tea polyphenol, then carboxymethyl chitosan is used for coating, and an epoxy compound containing a Si-O chain segment is grafted; preparing a protective coating from composite zinc oxide and soybean oil-based self-repairing waterborne polyurethane, and coating the surface of a substrate with the protective coating; soybean oil-based polyol, polytetrahydrofuran ether glycol and isophorone diisocyanate are used as raw materials to prepare a polyurethane prepolymer, 2, 2-bis (hydroxymethyl) propionic acid is used as a hydrophilic chain extender, an epoxy compound containing a Si-O chain segment is used as a modifier, 1, 4-butanediol and dithiodiethanol are used as end-capping reagents, triethylamine is used as a neutralizer, and the polyurethane prepolymer is prepared by a one-step method. And ethylene diamine and tetraethylenepentamine are used as amine cross-linking agents to prepare the soybean oil-based self-repairing waterborne polyurethane.

The present invention discloses a method for upgrading polyester materials to dicarboxylic acid esters and ethylene carbonate, and relates to the comprehensive utilization of waste resources and the cascade utilization of raw materials. The method uses multiple types of green ionic liquid catalysts to catalyze the methanolysis reaction of PET, and then dimethyl carbonate captures the generated ethylene glycol in situ, forms a five-membered cyclic ethylene carbonate through nucleophilic cyclization, pulls the reaction equilibrium to move forward, and completely depolymerizes PET waste. The products of the method of the present invention are dimethyl terephthalate and five-membered cyclic ethylene carbonate. The present invention can be used for the depolymerization and upgrading of waste PET materials, and can also be used for other similar polyesters, such as polyethylene succinate, polyethylene adipate and polyethylene 2,5-furan dicarboxylate, which are also suitable for the recovery strategy of the present invention, and the products are the corresponding dimethyl succinate, dimethyl adipate and 2,5-furan dicarboxylate.

The biodegradable PBAT / bamboo charcoal master batch is prepared from the following raw materials in parts by mass: 100 parts of poly (butylene adipate-co-terephthalate) (PBAT), 20 to 30 parts of poly (butylene succinate), 10 to 30 parts of modified bamboo charcoal powder and 0.2 to 0.4 part of chain extender, the modified bamboo charcoal powder is obtained by sequentially carrying out persulfate treatment, microwave-assisted reaction and grafting agent modification on bamboo charcoal powder, and the grafting agent comprises polybasic acid and an epoxy compound. The bamboo charcoal powder is subjected to grafting modification, so that the interfacial compatibility with the PBAT base material and the matrix dispersity are remarkably improved, and the mechanical property of the composite material is improved. The modifier compounded according to a specific ratio improves the damp-heat aging resistance of the master batch composite material.

The invention belongs to the technical field of fruit and vegetable preservation, and provides a preparation method of a silver nanoparticle / titanium dioxide / polydopamine modified montmorillonite antibacterial agent and application of the antibacterial agent in a copolyester / poly (butylene adipate-succinate)-terephthalate degradable film. The preparation method comprises the following steps: firstly preparing montmorillonite modified by polydopamine, and then mixing the montmorillonite modified by polydopamine with AgNO3 / TiO2 composite sol to prepare the antibacterial agent AgNPs / TiO2 / PMMT. The preparation method comprises the following steps: preparing an antibacterial agent, blending the antibacterial agent with PBTF and PBAT to prepare the antibacterial degradable composite air-conditioning film, and the composite air-conditioning film has antibacterial performance, excellent mechanical performance and air-conditioning performance, and can be applied to fruit and vegetable preservation.

The present disclosure relates to a biodegradable multilayer film comprising stacked on each other in the following order: a) a first outer layer comprising a first polymer selected from the group consisting of poly (butylene adipate-co-terephthalate) (PBAT), poly (butylene succinate) (PBS), poly (butylene succinate-co-adipate) (PBSA), and mixtures thereof; b) a core layer comprising a blend of thermoplastic starch (TPS) and polybutylene adipate terephthalate (PBAT); c) a second outer layer comprising a second polymer selected from the group consisting of poly (butylene adipate-co-terephthalate) (PBAT), poly (butylene succinate) (PBS), poly (butylene succinate-co-adipate) (PBSA), and mixtures thereof. The present disclosure also relates to a disposable bag, a bioreactor and a container suitable for mixing, packaging, storing or transporting biopharmaceutical substances, wherein the disposable bag, bioreactor and container comprise the biodegradable multilayer film.

The invention relates to the technical field of analysis and detection, in particular to a fluorescent switch sensor based on quantum dot-nano porphyrin and application. The specific technical scheme is as follows: the fluorescent switch sensor is constructed by utilizing cadmium telluride quantum dots modified by mercaptosuccinic acid and a 5, 10, 15, 20-tetra (4-nitrophenyl) porphyrin nano material modified by a cationic surfactant hexadecyl trimethyl ammonium bromide. And the method has a good enrichment effect on zearalenone. The sensor has high sensitivity, high selectivity and anti-interference performance, can accurately analyze trace zearalenone in actual grain samples (corn, rice, soybean and the like), and has the advantages of simplicity in operation, low detection limit, high sensitivity, low cost and the like.

The invention discloses a preparation method and application of a powder coating for a super-weather-resistant high-flexibility coiled material, and relates to the technical field of powder coatings. The invention discloses a preparation method of a powder coating for a super-weather-resistant high-flexibility coiled material, which comprises the following steps: mixing filler modified polyester resin, a curing agent, a defoaming agent, a flatting agent, an adhesion promoter and polytetrafluoroethylene wax according to the weight percentage of the raw materials to obtain the powder coating; the filler modified polyester resin disclosed by the invention is obtained by reacting aminated hydroxyl-terminated polyester, phosphorous acid and epoxy modified graphene oxide and then carboxylating by butanedioic anhydride; the filler modified polyester resin prepared by the invention is added into a coating as a base material of a powder coating, so that the coating is endowed with the characteristics of high weather resistance and high flexibility.

The invention relates to the field of bioengineering, in particular to a construction method and application of recombinant yarrowia lipolytica with high succinic acid yield. The recombinant yarrowia lipolytica disclosed by the invention simultaneously expresses a reduced tricarboxylic acid pathway related gene, a glyoxylic acid circulation pathway related group, a heterologous dicarboxylic acid transport related gene and a mitochondrial transport related gene, and an endogenous dicarboxylic acid transport protein coding gene is also knocked out; and a natural promoter of an isocitrate dehydrogenase coding gene IDH1 is replaced. The recombinant yarrowia lipolytica constructed by the invention can produce 112.85 g / L of succinic acid after fed-batch fermentation under the condition of not controlling pH, and efficient synthesis of succinic acid in the yarrowia lipolytica is realized.

The invention discloses environmentally degradable plastic as well as a preparation method and application thereof, and belongs to the technical field of degradable plastic. The degradable modified plastic is prepared from the following raw materials: polylactic acid, poly (butylene terephthalate)-adipate, modified thermoplastic starch, modified cellulose, poly (butylene succinate), epoxidized soybean oil, polyvinyl alcohol, glycerol monolaurate and ethylenediaminetetraacetic acid. Wherein the modified thermoplastic starch is obtained by thermoplastic modification of starch through a plasticizer and modification of castor oil and toluene diisocynate; the modified cellulose is obtained by modifying cellulose acetate with chitosan. By regulating and controlling the types and proportions of the raw materials for preparing the plastic, the plastic with excellent degradation performance and mechanical performance can be obtained, the shopping bag is prepared from the plastic, the loading capacity can be remarkably improved, the plastic is easily degraded by microorganisms in the environment after being discarded, and environmental pollution is avoided.

The invention provides an ash-free antirust agent and a preparation method thereof. The preparation method comprises the following steps: in a non-polar solvent, mixing dinonyl naphthalene sulfonic acid and dodecenylsuccinic acid to obtain a mixed acid A; the preparation method comprises the following steps: mixing polyethylene polyamine and mixed acid A according to a molar ratio of (0.5-2.0): 1, and adding deionized water and methanol to react until the pH value of the solution is neutral; and adding methyl methacrylate and base oil into the reacted system, heating and distilling, and then carrying out reduced pressure distillation until no obvious distillate is generated, thereby obtaining the ash-free antirust agent. The invention also provides the ash-free antirust agent prepared by the method. The ashless antirust agent integrates the advantages of the dinonyl naphthalene sulfonic acid group and the dodecenyl succinic acid group on the molecular level, the antirust property is better, and the ashless antirust agent and the anti-wear reagent at extreme pressure have a very good synergistic effect.