162 results about "Trimellitic anhydride" patented technology

The present invention relates to the field of polyurethane materials and particularly to a temperature-induced color-changing vehicle film and a preparation method therefor. The method of the present invention comprises: firstly, using polyurethane to wrap vanadium dioxide powder to obtain color-changing microcapsules; then using 1,1,1,3,5,5,5-heptamethyltrisiloxane and 3-allyloxy-1,2-propanediol as raw materials to synthesize an organosilicon-modified diol, and enabling trimellitic anhydride to react with toluene diisocyanate to synthesize a dicarboximide compound; enabling the organosilicon-modified diol and the dicarboximide compound to undergo an esterification reaction and a polymerization reaction to obtain an organosilicon-modified imide polyester diol; then mixing the organosilicon-modified imide polyester diol with polytetrahydrofuran ether glycol 2000, and then enabling the mixture to react with toluene diisocyanate to obtain a polyurethane elastomer; and mixing the polyurethane elastomer, the color-changing microcapsules, a silane coupling agent, a plasticizer, an antioxidant, and an ultraviolet light absorber, followed by melt extrusion and blow molding into a film, so as to obtain the temperature-induced color-changing vehicle film.

The invention discloses an epoxy powder coating and a preparation method thereof, and belongs to the technical field of powder coating production, firstly, the epoxy powder coating is prepared from the following raw materials in parts by mass: 100 parts of epoxy resin, 15-20 parts of modified phenolic resin, 12-15 parts of carboxyl-terminated polyester resin, 4-8 parts of nano cerium oxide coated mica, 1.5-2.0 parts of a flatting agent and 0.5-1.0 part of benzoin; the modified phenolic resin is prepared by carrying out addition on bisphenol A phenolic resin and DOPO, neutralizing and carrying out reduced pressure distillation; the carboxyl-terminated polyester resin is prepared by carrying out esterification polycondensation on terephthalic acid, isophthalic acid, neopentyl glycol and trimethylolpropane, and then modifying by trimellitic anhydride; the nano cerium oxide coated mica is prepared by coating white mica powder with cerium oxide precipitate, and then carrying out surface treatment and crushing.

The invention provides hyperbranched polyhydroxy polyester resin as well as a preparation method and application thereof in preparation of an acrylic resin coating, and relates to the technical field of polymer coating compositions. According to the hyperbranched polyhydroxy polyester resin, pentaerythritol is adopted as a core, succinic anhydride, tetramethyl cyclobutanediol and trimellitic anhydride are sequentially connected to a hyperbranched molecular structure in a comonomer form through a continuous esterification reaction method, and the hyperbranched polyhydroxy polyester resin is prepared. In the preparation process of the hyperbranched polyhydroxy polyester resin, the reaction process can be controlled only through an acid value, meanwhile, polyester with a hyperbranched structure is synthesized by adopting a one-pot method, and the hyperbranched polyhydroxy polyester resin has the technical advantages that the synthetic resin step is simple, and a separation process is not needed. The hyperbranched polyhydroxy polyester resin can be widely applied to the preparation process of an acrylic resin coating.

The invention relates to the technical field of alkyd resin, in particular to organosilicone modified waterborne alkyd resin and a preparation method thereof.The method comprises the following steps that cottonseed oil, an alcoholysis catalyst and trimethylolpropane are subjected to an alcoholysis reaction under protection of inert gas, and an alcoholysis product is obtained; 2, carrying out esterification polymerization reaction on the alcoholysis product, a water-carrying agent, phthalic anhydride and trimellitic anhydride to obtain basic alkyd resin; the organic silicon modified alkyd resin is obtained from the basic alkyd resin and organic silicon under the action of the modified catalyst; sequentially adding a cosolvent, a neutralizer and water into the organic silicon modified alkyd resin, and stirring and mixing to obtain the organic silicon modified waterborne alkyd resin. According to the invention, through a modification technology, the hydrophobicity of a coating is enhanced while the water dispersibility of the organosilicon modified alkyd resin is ensured, so that the organosilicon modified resin has self-cleaning capability and permeation corrosion resistance, a steel structure material can be effectively protected, and the service life of the steel structure material is prolonged.

The invention relates to the technical field of wastewater treatment, and discloses a preparation method of a heavy metal capturing agent for wastewater treatment, which comprises the following steps: reacting 2-chloroethanol with trimellitic anhydride acyl chloride, and reacting with N, N-dimethyl ethyl trimesoamide to obtain a novel quaternary ammonium salt anhydride intermediate. The three-dimensional hyperbranched molecular chain heavy metal capturing agent contains three anhydride groups which are subjected to amidation polymerization reaction with two amino groups of diaminooxane to obtain the three-dimensional hyperbranched molecular chain heavy metal capturing agent. The heavy metal capturing agent has good adsorption sites, hydrophilicity and dispersibility in water, is not easy to gather, and is beneficial to improving the adsorption performance of the heavy metal capturing agent. Meanwhile, the heavy metal trapping agent contains a large number of carboxyl groups which can be coordinated with Pb < 2 + > and other metal ions, and meanwhile, quaternary ammonium salt cations can be subjected to electrostatic interaction with Cr2O7 < 2-> ions, so that the adsorption capacity of the heavy metal trapping agent on the Pb < 2 + >, Cr2O7 < 2-> and other metal ions is remarkably improved.

The invention discloses a preparation method of a polyamide-imide-polyimide copolymer resin binder and a semiconductor element temporary packaging adhesive film, and the preparation method comprises the following steps: under the protection of inert gas, dissolving flexible long-chain aromatic diamine, siloxane diamine and 4, 4 '-dithio diphenylamine in a polar organic solvent, and stirring to obtain a mixed solution; the preparation method comprises the following steps: adding an acid-binding agent, uniformly stirring and mixing in an ice bath, adding trimellitic anhydride acyl chloride for reaction, heating to 15-45 DEG C, adding flexible long-chain dianhydride for reaction, adding an end-capping reagent for end capping, and diluting; adding a catalyst and a water absorbent into the diluted reaction liquid to carry out imidization treatment to obtain polyamide-imide-polyimide copolymer resin; diluting the polyamideimide-polyimide copolymer resin adhesive until the solid content is 15-25%, adding siloxane epoxy resin, and uniformly stirring and mixing, so as to obtain the polyamideimide-polyimide copolymer resin adhesive. The heat-resistant adhesive has excellent heat resistance and cohesiveness, and no adhesive residue exists in the stripping process.

The application discloses a kind of super branched chain high-performance environmentally friendly phthalate plasticizers, PVC product and its preparation method and application, belong to material technical field.The super branched chain high-performance environmentally friendly phthalate plasticizers are esterified and polycondensed by polybasic acid and mixed dihydric alcohol in the presence of catalyst, and are obtained by monohydric alcohol end-capping;Polybasic acid includes trimellitic anhydride, mixed dihydric alcohol includes at least two of methyl propylene glycol, neopentyl glycol, ethylene glycol and propylene glycol.The super branched chain high-performance environmentally friendly phthalate plasticizers are well compatible with PVC, good color, with good viscosity, density, acid value and other performance indicators, which is used in PVC product, can make PVC product not only has superior aging resistance and electrical insulation performance, but also has outstanding oil extraction resistance, migration resistance, volatile resistance and thermal stability performance.

The invention relates to the field of glass panel resin, in particular to glass alkali wash resin and a preparation method thereof. The glass alkali wash resin provided by the invention is prepared from the following components in parts by mass: 90-100 parts of polyhydric alcohols which are selected from one or more of CTP244, GE-220 and UH-200; 25 to 35 parts of polyisocyanate; 13 to 25 parts of hydroxyl acrylate; 8-15 parts of an anhydride compound, wherein the anhydride compound is selected from one or more of acetic anhydride and trimellitic anhydride; 0.1 to 1.0 part of a catalyst; and 0.2 to 2.0 parts of a polymerization inhibitor. According to the invention, the SP value difference and transparency of a curing system are improved through the matching of specific polyhydric alcohols and anhydride compounds; in addition, the film forming and drying performance of a curing system is improved by introducing polyhydric alcohol; and finally, good surface dryness and transparency of the obtained glass alkali wash resin are realized.

The present invention belongs to the technical field of enameled wires, and particularly relates to a liquid crystal polymer paint for enameled wires and an enameled wire. The liquid crystal polymer paint for enameled wires comprises a modified LCP and a diluent, the diluent being DMF or DMAC, and the modified LCP is obtained by a condensation polymerization reaction of a monomer, acetic anhydride and a modified monomer, and the modified monomer is glycerol or trimellitic anhydride. The enameled wire comprises a flat copper wire, a primer coated on the surface of the flat copper wire, and a topcoat coated on the surface of the primer, the primer being a liquid crystal polymer paint for enameled wires modified with trimellitic anhydride, and the topcoat being a liquid crystal polymer paint for enameled wires modified with glycerol. The technical solution provided by the present invention, through graft modification of LPC, enables it to be dissolved in a solvent, so that it can be used as a paint, especially as an enameled wire, having the advantages of oil resistance, high temperature resistance, stable electrical properties, etc.

The invention provides a steam explosion cotton stalk fiber ecological restoration material and a preparation method thereof, and belongs to the technical field of modified materials. Comprising the following raw materials in parts by weight: 5-10 parts of modified tailings; 47-60 parts of modified steam blasting cotton stalk fibers; the modified tailings are a material which is modified by polydopamine and a silane coupling agent and then is coated with an acrylic copolymer; the modified steam explosion cotton stalk fiber is a material prepared by mixing cotton stalk powder subjected to steam explosion with a fermented enzymolysis compound, polymerizing and modifying tannic acid, coupling humic acid, rosmarinic acid and amino cyclodextrin, and then reacting with trimellitic anhydride. According to the prepared steam explosion cotton stalk fiber ecological restoration material, a colloidal hard shell is formed on the surface layer after spray seeding, a protection blanket is formed and tightly attached to a restoration face, the wind-water erosion resistance of the material is improved, the materials can be converted into nutrients needed by plant growth, the good heavy metal ion adsorption and fixation capacity is achieved, the soil quality is effectively improved, and the ecological restoration effect is good. And the method has very important significance.

To provide a method for producing a trimellitic anhydride ester satisfying high yield, high purity and low chlorine content required for an electronic material by a simple operation.SOLUTION: The method for producing a trimellitic anhydride ester includes a step A of reacting a trimellitic anhydride halide and a specific alkanediol to obtain a crude trimellitic ester, and a step B of purifying the crude trimellitic ester, wherein the step B includes a step B1 of mixing a poor solvent having an octanol / water partition coefficient of -2.0 or more and 0.0 or less and a boiling point of 40°C or more and 120°C or less with the crude trimellitic ester to reprecipitate the crude trimellitic ester, and a step B2 of heating the mixed liquid containing at least the crude trimellitic ester after the reprecipitation and acetic anhydride, and recrystallizing the trimellitic ester.SELECTED DRAWING: None

The invention relates to a multi-element catalyst for producing trioctyl trimellitate and application of the multi-element catalyst. The multi-element catalyst comprises a main catalyst and a co-catalyst; the main catalyst is one or a mixture of several of stannate, a titanic acid compound, stannous chloride, stannous octoate and dibutyltin p-toluenesulfonate; and the cocatalyst is a quaternary ammonium salt ionic catalyst. The preparation method comprises the following steps: adding isooctyl alcohol into an esterification reaction kettle, preheating, adding trimellitic acid or trimellitic anhydride in batches, and stirring; adding a multi-element catalyst, heating to carry out primary esterification reaction, and further heating to carry out esterification reaction; and after the reaction is completed, removing the isooctanol under high vacuum to obtain the trioctyl trimellitate. The method has the advantages that when the multi-element catalyst is applied to synthesis of trioctyl trimellitate, the catalytic effect is good, the reaction is rapidly completed at a relatively low temperature, decomposition and deterioration of raw materials, a large amount of side reactions and generation of impurities, which are easily caused by high-temperature dissolution, are avoided, the reaction time is shortened, and the prepared trioctyl trimellitate is light in color, high in purity and high in yield.

The invention relates to the technical field of cleaning agents, in particular to a nonionic surfactant which comprises the following components in parts by weight: 20-80 wt% of a component A and 20-80 wt% of a component B, the component A is prepared from 5 to 16 parts of trimellitic anhydride, 2 to 10 parts of trimethylolpropane, 15 to 65 parts of glycidyl tertiary carboxylic ester, 21 to 35 parts of N, N-dimethylacetamide, 8 to 21 parts of a catalyst, 5 to 12 parts of isophorone diisocyanate, 8 to 17 parts of polyethylene glycol 600 and 3 to 8 parts of 2, 2-dimethylolpropionic acid; the component B comprises 12-45 parts of sorbitol and 31-62 parts of fatty acid, and the fatty acid is one or more of lauric acid, palmitic acid, stearic acid and oleic acid. The prepared non-ionic surface active agent has green and environment-friendly performance. Meanwhile, the cleaning agent prepared by adopting the nonionic surfactant is relatively good in surface activity, and has good stability, temperature resistance and salt resistance.

The invention provides a sintered polymer for N-type TOPCON electronic paste as well as a preparation method and application of the sintered polymer. The preparation method comprises the following steps: reacting micromolecular dihydric alcohol with trimellitic anhydride; reacting the obtained product with glycidyl ether; gamma-glycidyl ether oxypropyl trimethoxy silane is added into a reaction system for a reaction, and a coupling agent modified epoxy oligomer is obtained; the preparation method comprises the following steps: reacting isocyanate with polyol, and then adding a sealing agent for reaction to obtain a sealed isocyanate prepolymer; and mixing the coupling agent modified epoxy oligomer with the blocked isocyanate prepolymer to obtain the polymer. The polymer material disclosed by the invention is used for N-type TOPCON electronic paste, and when a photovoltaic module is prepared, the problem of partial short circuit or open circuit of a battery piece caused by grid line falling can be avoided.

The invention discloses an A2-level halogen-free flame-retardant and fireproof aluminum-plastic composite board and a preparation method thereof, and belongs to the technical field of special composite material preparation. The aluminum-plastic composite board comprises an aluminum panel and a core material. The core material is prepared by using 3-amino-4-hydroxybenzoic acid and trimellitic anhydride as raw materials to prepare a modified polyester monomer having a phenolic benzimide group, and then using hydroxylated norbornene benzimide as an initiator to copolymerize with phthalic anhydride, styrene oxide and the modified polyester monomer to prepare an intermediate product, and finally the intermediate product is copolymerized with ethylene under the action of a catalyst to prepare the intermediate product. The invention provides an A2-level halogen-free flame-retardant and fireproof aluminum-plastic composite board and a preparation method thereof by modifying components on the basis of polyethylene, and improves the flame retardancy of the aluminum-plastic board on the basis of keeping the organic core material light.

The application belongs to the field of fine chemical industry and provides a catalyst system and a continuous process for producing trimellitic anhydride, which comprises: a first-stage oxidation catalyst composed of 0.02-1% of cerium acetate and 0.5-5% of hydrogen peroxide; and a second-stage oxidation catalyst composed of 0.01-0.05% of copper acetate and 0.01-1% of manganese acetate. The application reduces the types and addition amount of catalysts, reduces the metal content in the product, and improves the yield of the product. Meanwhile, the application designs a continuous process flow, realizes continuous and efficient oxidation of trimethylbenzene, and realizes continuous production of rapid anhydride formation. Through continuous removal of acetic acid and water in the oxidation and anhydride formation processes, the reaction heat and product water are removed, the process is intensified, the forward reaction is promoted, and then the solvent acetic acid is reused through rectification separation. In addition, the continuous production process also solves the technical defect problems existing in the batch method.

The present invention relates to a polyimide, and a resin composition comprising the polyimide and an acrylic resin. The polyimide contains, as the diamine component, a diamine having one or more structures selected from the group consisting of CF3-O-,-(CF2-O) n-, and-O-(CF2-CF2-O) n-(wherein n is an integer of 1-20), and contains, as the tetracarboxylic acid dianhydride component, a diamine having one or more structures selected from the group consisting of CF3-O-,-(CF2-O) n-and-O-(CF2-CF2-O) n-. The present invention is characterized by comprising one or more tetracarboxylic acid dianhydrides selected from the group consisting of tetracarboxylic acid dianhydrides having an ether bond, tetracarboxylic acid dianhydrides having a fluorene structure, tetracarboxylic acid dianhydrides having a xanthene structure, and bis (trimellitic anhydride) esters.

This invention relates to a novel, highly efficient bactericide and its preparation method, belonging to the field of antibacterial materials technology. The invention utilizes the reaction of epoxy groups and tertiary amine compounds in maleic pine carboxylic acid glyceride under hydrochloric acid to convert the epoxy groups into a hydroxyl quaternary ammonium salt structure. Then, an esterification reaction between trimellitic anhydride acyl chloride and hydroxyl groups is used to introduce an anhydride group into the molecular chain. Finally, an esterification reaction between anhydride and hydroxyl groups is used to introduce quaternary phosphonium salt and silver citrate structures into the molecular chain, resulting in a novel, highly efficient bactericide. The novel, highly efficient bactericide prepared by this invention simultaneously contains quaternary ammonium salt, quaternary phosphonium salt, and metallic silver ions. The positively charged quaternary ammonium salt and quaternary phosphonium salt are adsorbed onto the negatively charged bacterial surface through electrostatic interactions, exerting antibacterial and bacteriostatic effects by altering membrane permeability. The silver ions in silver citrate can bind to the sulfhydryl and carboxyl groups of bacterial membrane proteins, disrupting membrane integrity and thus exerting antibacterial and bacteriostatic effects.

The invention discloses a sealant with bacteriostatic and mildew-proof functions for a metal bottle cap and a preparation method of the sealant, and belongs to the technical field of sealant preparation. The sealant provided by the invention is prepared from the following raw material components in percentage by mass: 40.0 to 55.0 percent of an auxiliary agent A, 0.5 to 3.0 percent of an auxiliary agent B, 2.0 to 4.0 percent of zinc stearate, 1.0 to 3.0 percent of titanium dioxide, 1.0 to 5.0 percent of ground calcium carbonate, 0.5 to 2.5 percent of an anti-blocking agent and 39.0 to 55.0 percent of polyvinyl chloride resin, the auxiliary agent A is prepared from at least two of dioctyl terephthalate, epoxidized soybean oil, trimellitic anhydride and cyclohexane 1, 2-diisononyl diformate; the auxiliary agent B is obtained by mixing and grinding zinc oxide, metal silver, zirconium phosphate, zinc pyrithione and coconut oil fatty acid diacetamide. According to the invention, the sealant is prepared by compounding multi-component food-grade antibacterial mildew-proof active components, so that the prepared sealant is ensured to reach the first-grade standard of ASTM G21-15 Determination of Antifungal Factor of Synthetic High Polymer Materials, meanwhile, the risk that the sealant is mildewed when being used in canned food is reduced, and the quality of the product is improved.

The present invention provides low-dielectric polyamic acid and a polyimide film, the low-dielectric polyamic acid comprising: a dianhydride acid component including two or more selected from the group consisting of biphenyltetracarboxylic dianhydride (BPDA), pyromellitic dianhydride (PMDA), and p-phenylenebis(trimellitate anhydride) (TAHQ); and a diamine component including one or more selected from the group consisting of oxydianiline (ODA), m-tolidine, and paraphenylene diamine (PPD), and the low-dielectric polyamic acid being obtained by copolymerizing the components.

Polyol compositions that contain imide groups are prepared by producing imide compounds from trimellitic anhydride and an aromatic aminoacid or an aromatic diamine, then esterifying the imide compounds with one or more polyols that have hydroxyl equivalent weights of 30 to 500. Aromatic carboxylic acid derivatives may be present during the esterification step to produce polyol compositions that contain species that have imide groups, and other species that do not have imide groups. The polyol compositions are useful in making isocyanate-based polymers, in particular polyurethane and / or polyurethane-isocyanuranate foams. The presence of the imide groups in the isocyanate-based polymers imparts fire retardant properties.

An object is to provide a crystal of isomannide-bis(trimellitate anhydride) having high purity and suitable as a resin raw material. As a solution, provided is a crystal of isomannide-bis(trimellitate anhydride), particularly, a crystal of isomannide-bis(trimellitate anhydride) having a melting endothermic peak in a specific range as obtained by differential scanning calorimetry or having a specific peak in a powder X-ray diffraction peak pattern obtained using Cu-Kα radiation.

The invention relates to a composition, a degradable material and application of the degradable material. The composition comprises polyadipic acid / butylene terephthalate, polylactic acid and butanediol / trimellitic anhydride modified epoxy resin. The composition according to one embodiment of the present invention comprises a butylene glycol / trimellitic anhydride modified epoxy resin and a poly (butylene adipate / terephthalate), in which the butylene glycol / trimellitic anhydride modified epoxy resin is capable of reacting with the poly (butylene adipate / terephthalate). When the composition is used for preparing a film, precipitation of poly (butylene adipate-co-terephthalate) after film preparation can be reduced, and the edge sealing performance of the film is improved.

The present application relates to trimellitic anhydride production technical field, especially trimellitic anhydride preparation catalyst and its application in trimellitic anhydride preparation.The present application provides a kind of trimellitic anhydride preparation catalyst, including the following weight parts of raw materials: main catalyst 5-10 parts, side chain oxidation promoter 1 part;The main catalyst is made of cobalt, manganese bimetallic organic framework and SBA-15 molecular sieve composite.The process of the present application has very high yield and purity when preparing trimellitic anhydride, and the best effect is example 1, the yield reaches 150%, and the purity reaches 99.9%.

The invention relates to the technical field of cables, in particular to a polytetrafluoroethylene insulated cable and a preparation process thereof. The preparation method comprises the following steps: irradiating a polytetrafluoroethylene film with a cobalt source, and grafting glycidyl methacrylate on the surface of the polytetrafluoroethylene film; the preparation method comprises the following steps: by taking allylamine and 1, 1, 3, 3-tetramethyldisiloxane as raw materials, carrying out hydrosilylation reaction to obtain amino-terminated tetramethyldisiloxane, reacting the product with biphenyltetracarboxylic dianhydride, and then adding trimellitic anhydride for blocking to obtain carboxyl-terminated silicon-containing polyimide; mixing carboxyl-terminated silicon-containing polyimide, epoxy resin, a curing agent, nano silicon carbide, a silane coupling agent and an antioxidant to obtain an epoxy resin glue solution; coating a polytetrafluoroethylene film on the surface of the silver-plated copper conductor wire core, coating an epoxy resin glue solution, and curing to obtain an insulating layer; attaching a silver film on the surface of the insulating layer to form a shielding layer; and coating a PFA sheath on the surface of the shielding layer to obtain the product. The polytetrafluoroethylene insulated cable prepared by the invention has good waterproof, wear-resistant and corrosion-resistant properties.

The invention relates to a device and a process method for producing trimellitic anhydride by continuous liquid-phase oxidation of unsym-trimethylbenzene. The device comprises an oxidation reaction tower, a DTB crystallizer, a horizontal screw centrifuge, an anhydride forming tower and a rectifying tower which are connected in sequence, the oxidation reaction tower is provided with N feed ports and N gas inlets, wherein N is greater than or equal to 3; 2N distributors are arranged in the cavity of the oxidation reaction tower; and the distributor is respectively connected with the feeding hole and the air inlet. The whole technological process is simple, the equipment investment is low, the automation degree is high, the product yield is high, the quality is good, the overall energy utilization efficiency is high, and part of problems existing in an intermittent process are solved.

The invention relates to the technical field of plastics, in particular to a material for a plastic bottle, a preparation method and application. According to the material, branched-chain polyethylene glycol terephthalate is used as a matrix, a composite filler is added, and the composite filler is composed of trimellitic anhydride functionalized reduced graphene oxide and nano titanium dioxide with the surface grafted with poly-n-butyl acrylate-co-glycidyl methacrylate. The plastic bottle is prepared through a melt blending method, the internal pressure resistance, impact resistance and stability of the plastic bottle are remarkably improved through the interface synergistic effect of a branched chain structure and the composite filler, the problems that in the lightweight process, due to the fact that the crystallinity is blindly improved, a bottle body becomes white and embrittled, and a process window becomes narrow are effectively solved, and the plastic bottle is suitable for high-performance beverage packaging.

The invention discloses a polyester type powder coating and a preparation method thereof, and belongs to the technical field of coating production, firstly, the polyester type powder coating is prepared from the following raw materials in parts by mass: 45 to 55 parts of film forming matter, 15 to 20 parts of curing agent, 5 to 15 parts of pigment, 10 to 15 parts of filler, 0.3 to 0.8 part of benzoin and 0.5 to 1.5 parts of antioxidant. Wherein the film forming substance is prepared by carrying out a self-polycondensation reaction on 2, 2-dimethylolpropionic acid under high-temperature catalysis and nitrogen protection; wherein the curing agent is prepared by the following steps: esterifying 2, 4-dihydroxybenzophenone and trimellitic anhydride in N, N-dimethylformamide, and catalyzing by ion exchange resin to obtain a carboxylic acid-containing intermediate; and carrying out ring-opening reaction with epoxy chloropropane, carrying out ring-closing reaction with NaOH, and introducing a glycidyl ester structure.

This invention discloses a method for synthesizing high-purity and high-stability trimellitic anhydride bisphenol S ester in the field of polymer monomer synthesis technology. The method includes: dissolving bisphenol S, a catalyst, and a composite stabilizer containing at least two components in an organic solvent under an inert atmosphere; slowly adding a trimellitic anhydride acyl chloride solution dropwise at low temperature; reacting with a stepwise temperature increase; and obtaining the product through precipitation, washing, and recrystallization. This invention optimizes the catalyst system and innovatively introduces a composite stabilizer with synergistic effects to protect the product in situ during the reaction. Combined with precisely controlled reaction and purification processes, it effectively suppresses side reactions and product decomposition. This method can stably prepare trimellitic anhydride bisphenol S ester with a purity of not less than 99% and excellent thermo-oxidative stability, solving the problems of low product purity and poor storage stability in existing technologies, and meeting the application requirements of high-end polymer materials.

The invention relates to a method for purifying electronic grade trimellitic anhydride in the technical field of new materials, which comprises the following steps of: preparing a substrate mixture, arranging a metal nanoparticle polyester coating material outside a high-strength membrane separation material in a mold, sintering and annealing to obtain a metal particle reinforced high-strength membrane separation material Zn / Ti (at) SMC-Y1, the trimellitic acid semi-finished product batch material passes through a filtering device filled with Zn / Ti (at) SMC-Y1, the filtering device is provided with a high-pressure backflushing device filled with nitrogen and pure water, when the membrane flux is low, the trimellitic acid semi-finished product batch material is used for purging stacked solids, and after the membrane is regenerated, filtering is conducted again till the maximum purification precision is achieved; and putting the purified trimellitic acid into a dehydration anhydride forming device for dehydration to obtain trimellitic anhydride. The method can realize efficient purification on the premise of ensuring high purity, and has the advantages of simplicity and convenience in operation, low cost, environmental friendliness and the like.