125 results about "Formic anhydride" patented technology

The invention discloses unsaturated polyester resin for imitation jade handicrafts and a preparation method thereof, and belongs to the technical field of polyester resin. Comprising the following components: diethylene glycol, methylpropanediol, propylene glycol, maleic anhydride, phthalic anhydride, an antioxidant, a polymerization inhibitor, paraffin, a stabilizer, an ultraviolet light absorber, a whitening agent and a diluent. The weight ratio of the propylene glycol to the methyl propylene glycol is (1.0-1.3): 1, and the methyl propylene glycol accounts for 20-22% of the total amount of the dihydric alcohol; the weight ratio of maleic anhydride to phthalic anhydride is (0.46-0.52): 1; the preparation method comprises 1) adding the raw materials and the antioxidant into a reactor, carrying out heating, carrying out heat preservation for 0.5-1.0 h and continuing heating, 2) carrying out a reaction for 2-3 h after heating, carrying out dehydration until an acid value is 20-25 mgKOH / g, and 3) carrying out cooling, adding the auxiliary agent and carrying out uniform mixing so that the unsaturated polyester resin is obtained.

The invention relates to high-flexibility phenolic-aldehyde-free rosin modified resin, and belongs to the technical field of rosin resin. The raw materials comprise rosin, maleic anhydride, phthalic anhydride, pentaerythritol, glycerol, an acrylate monomer and magnesium oxide. The preparation process comprises four key reactions: (1) rosin and maleic anhydride are subjected to a Diels-Alder reaction to construct a rigid skeleton; (2) introducing phthalic anhydride to form a compact cross-linked network; (3) carrying out composite esterification on pentaerythritol and glycerol; and (4) the interface binding energy is improved by regulating and controlling the in-situ RAFT polymerization of the acrylate monomer. The resin does not contain phenolic aldehyde components, VOCs emission is smaller than 50 g / L, free formaldehyde is not detected, and the resin has high flexibility, heat resistance and excellent chemical resistance.

The invention discloses lighting resin as well as a preparation method and application thereof, and belongs to the technical field of lighting type unsaturated polyester resin. Comprising the following components: ethylene glycol, benzoic acid, phthalic anhydride, maleic anhydride, an antioxidant, a defoaming agent, a surfactant, a stabilizer, styrene, a solvent, a first polymerization inhibitor, a second polymerization inhibitor and a third polymerization inhibitor. The alcohol-acid ratio is (1.03-1.13): 1; the molar ratio of unsaturated acid to saturated acid is (2.5-3.5): 1; the mass ratio of benzoic acid to the surfactant is (26.8-44): 1; the preparation method comprises the following steps: 1) reacting ethylene glycol, maleic anhydride, phthalic anhydride, benzoic acid, an antioxidant and a first polymerization inhibitor; the preparation method comprises the following steps of (1) adding a first polymerization inhibitor, (2) heating and preserving heat after the reaction is completed, and (3) cooling, adding a second polymerization inhibitor, cooling, adding a third polymerization inhibitor, a cross-linking agent, a surfactant and a defoaming agent, and adding a solvent to obtain the daylighting resin.According to the preparation method, the surfactant and benzoic acid have a synergistic effect, so that the compatibility of polyester and the cross-linking agent is improved.

The invention relates to rosin modified resin and a preparation process thereof and low-odor printing ink, the rosin modified resin is prepared from maleic anhydride, sulfonate alkyd resin, rosin and a metal organic framework, and the sulfonate alkyd resin is prepared from neopentyl glycol, dibutyltin dilaurate, m-phthalic acid-5-sodium sulfonate, phthalic anhydride and pentaerythritol. The printing ink has the effect of improving the strength and smell of the printing ink.

The invention discloses a cellulose acetate based 1, 8-naphthalimide fluorescent probe for detecting Hg < 2 + > as well as a preparation method and application of the cellulose acetate based 1, 8-naphthalimide fluorescent probe. The preparation method comprises the following steps: by taking 4-bromo-1, 8-naphthalic anhydride as a raw material, carrying out condensation reaction on the 4-bromo-1, 8-naphthalic anhydride and 4-aminobutyric acid to prepare 4-(4-bromo-1, 8-naphthalic diimide) butyric acid (BNA-B); the BNA-B and piperazine are subjected to a substitution reaction, and a compound PNA-B is prepared; the PNA-B and 4-(bromomethyl) pyridine hydrochloride are subjected to a substitution reaction, and a compound PNA-B is prepared; and the PNA-B and cellulose acetate (CA) are subjected to an esterification reaction, such that the cellulose acetate-based 1, 8-naphthalimide fluorescent probe PNA-CA is prepared. The compound can specifically recognize Hg < 2 + >, after Hg < 2 + > is added into a PNA-CA acetonitrile / PBS buffer solution under 365nm ultraviolet irradiation, the fluorescence color of the solution is changed from colorless to yellow, the response time is 20s, the detection limit reaches 9.3 * 10 <-8 > M, and the probe has a good application prospect.

This invention discloses a cellulose acetate-based 1,8-naphthalenedimide fluorescent probe for detecting hydrazine, its preparation method, and its application. The invention uses 4-bromo-1,8-naphthalenedimide as a raw material, which undergoes a condensation reaction with 4-aminobutyric acid to obtain 4-(4-bromo-1,8-naphthalenedimide)butyric acid (BNA-B); BNA-B undergoes a coupling reaction with 4-formylphenylboronic acid to obtain 4-(4-(4-formylphenyl)-1,8-naphthalenedimide)butyric acid (FNA-B); compound FNA-B then undergoes an esterification reaction with cellulose acetate (CA) to obtain the cellulose acetate-based 1,8-naphthalenedimide fluorescent probe FNA-B-CA. This compound specifically recognizes hydrazine. Under 365 nm ultraviolet light irradiation, the addition of hydrazine to a DMF / H2O solution of FNA-B-CA changes the fluorescence color of the solution from bright blue to colorless, indicating a detection limit of 8.4 × 10⁻⁶ for hydrazine. ‑8 M has promising applications as a fluorescent probe for the detection of hydrazine.

The invention discloses a sewage treatment membrane and a preparation method thereof, and relates to the field of sewage treatment. When the sewage treatment membrane is prepared, porous nano titanium dioxide, 3, 5-diaminopyrazole and benzo [1, 2-B: 3, 4-B ': 5, 6-B'] trithiophene-2, 5, 8-trialdehyde are uniformly mixed to prepare modified nano titanium dioxide; the preparation method comprises the following steps: reacting 1, 3, 5, 7-tetramethylcyclotetrasiloxane, 1, 3-bis (3-aminopropyl) tetramethyldisiloxane, 2-vinyl imidazole and 1-allylhydantoin to prepare functionalized amino siloxane; and uniformly mixing p-phenylenediamine, functionalized amino siloxane, pyromellitic dianhydride, modified nano titanium dioxide and zinc nitrate hexahydrate, and treating with a sodium hypochlorite solution to obtain the sewage treatment membrane. The sewage treatment membrane prepared by the invention has excellent heavy metal ion complexing property, antibacterial property and photocatalytic degradability.

The invention discloses a 4-BrPA / beta-CD supramolecular photosensitizer as well as a preparation method and application thereof, and belongs to the field of biomedical materials. According to the method, beta-cyclodextrin is used as a subject, 4-bromophthalic anhydride is used as an object, and the water-soluble photosensitizer is constructed through a chemically modified supramolecular assembly strategy. The preparation method comprises the following specific steps: reacting beta-cyclodextrin with paratoluensulfonyl chloride to obtain mono-(6-O-paratoluensulfonyl)-beta-cyclodextrin; then carrying out a reaction with ethidene diamine to obtain mono-(6-ethidene diamine-6-deoxy)-beta-cyclodextrin; then reacting with 4-bromophthalic anhydride in N, N-dimethylformamide, and precipitating and purifying through ethyl acetate to obtain a crude product; and finally, carrying out ultrasonic treatment, centrifugal separation and freeze drying to obtain a pure product. The prepared 4-BrPA / beta-CD supramolecular photosensitizer is excellent in water solubility, has at least 7 excitation centers in a visible light region of 400-520 nm, correspondingly generates at least 7 emission centers in a range of 500-780 nm, has a maximum excitation wavelength of about 460 + / -10 nm and a maximum emission wavelength of about 620 + / -10 nm, has an extremely wide visible light response characteristic, and can be used for antibacterial photodynamic therapy.

The present application relates to photosensitive polyimide oligomer, preparation method and polyimide photosensitive resin composition prepared by the same, the present application provides the molecular formula of photosensitive polyimide oligomer, which is prepared from 1, 4, 5, 8-naphthalene tetracarboxylic anhydride, N, N-dimethylacetamide, triethylamine, tetramethyl benzene dimethyl diisocyanate, hydroquinone methyl ether, dibutyl tin dilaurate and hydroxyethyl acrylate according to the molar ratio of 2.5:10-15:1.2-1.6:3.0:0.0035-0.0045:0.007-0.01:2-2.5.The good solubility group is introduced into the molecular structure, so that it has good solubility in active diluent, and the polyimide oligomer can be photocured reaction;The device printed by the polyimide photosensitive resin composition prepared by the same has small shrinkage, high precision, and has the excellent performance of photosensitive polyimide oligomer, and has certain toughness and excellent weather resistance.

The application discloses an indoor moisture-proof and water-resistant gypsum board and a preparation method thereof, and belongs to the technical field of gypsum board preparation. The preparation method of the indoor moisture-proof and water-resistant gypsum board comprises the following steps: S1, uniformly mixing building gypsum, modified fluorite gypsum, deionized water, a polyester adhesive, a composite water reducing agent, blast furnace slag powder and the like to obtain a gypsum slurry; S2, paving the gypsum slurry on a first layer of cover paper, paving a second layer of cover paper on the gypsum slurry, and performing compaction, final setting, drying and solidification to obtain the indoor moisture-proof and water-resistant gypsum board. The composite water reducing agent is obtained by the reaction of ethyl vinyl ether, trichlorofluoroethylene and allyltrimethoxysilane. The polyester adhesive is obtained by the reaction of allyl alcohol, phthalic anhydride and triallyl cyanurate. The prepared gypsum board not only has good moisture-proof and water-resistant performance, but also has good mechanical properties, thereby prolonging the service life and ensuring the quality of the gypsum board to a certain extent.

The application discloses a brazing flux capable of enhancing the radiation resistance of aluminum alloy brazing joints, and a preparation method and application thereof. The brazing flux is composed of 5-18% of an organic mixture and the balance of an inorganic mixture. The organic mixture is composed of 7-15% of EP-12 epoxy resin, 8-16% of EP-16 epoxy resin, 5-8% of F-51A high-temperature-resistant flame-retardant thermosetting phenolic resin, 5-8% of F-52A high-temperature-resistant flame-retardant thermosetting phenolic resin, 5-8% of resorcinol, 5-8% of hydroquinone and the balance of phthalic anhydride. The inorganic mixture is composed of 40-55% of CsF, 20-30% of AlF3, 0.005-0.01% of GaF3 and the balance of Al(OH)3. The brazing flux matches Zn-Al filler metal, can make the aluminum alloy brazing joint have good radiation resistance, and can significantly improve the shearing strength of the brazing joint.

The invention relates to the technical field of chemical preparation, and discloses a preparation method of a phthalimide compound, which comprises the following steps: S1, raw material mixing: sequentially adding phthalic anhydride, a primary amine compound, p-toluenesulfonic acid and phosphorus pentoxide into a reaction container with a stirring device and a temperature control module, and stirring for 1-2 hours; adding ethanol as a solvent, and carrying out a stirring reaction; s2, curing: cooling the reaction liquid to 20-25 DEG C, slowly adding deionized water into the reaction liquid while stirring, standing, and separating out a solid product; a traditional dehydrating agent is changed into a low-cost green dehydrating agent combination, so that the cost loss is reduced, the stimulation effect is reduced, the catalytic activity is equivalent to that of p-toluenesulfonic acid by adding a new sulfonic group functional polymer, but the problems of volatility of liquid acid and equipment corrosion are avoided, a low-toxicity and low-cost solvent of ethanol is added, the toxicity is reduced, and the environment-friendly dehydrating agent is prepared. The preparation is safer, the cost is lower, and the applicability is wider.

This invention relates to a taraxasterol nitrobenzoate derivative in the field of medicinal chemistry, with the following structural formula: Compound B is obtained by reacting taraxasterol 1 with 4-nitrophthalic anhydride in a suitable alkaline catalyst and organic solvent. This synthetic route offers high yield and is easy to implement. Activity tests demonstrate that the taraxasterol nitrobenzoate derivative shown as B, designed and synthesized in this invention, is a suitable antitumor drug candidate, particularly as a candidate drug for lung cancer.

This invention discloses a method for preparing a supported low-carbon hydrocarbon deodorization catalyst. The method includes: (1) preparing a catalyst containing M... 2+ and M' 3+ (1) Add molecular sieve to the solution and stir evenly; (2) React the obtained suspension with a mixed solution of NaOH and Na2CO3 or a weak alkaline solution under stirring; (3) Obtain the composite carrier by drying and calcination; (4) Prepare a cobalt salt solution and transfer Co to the cobalt salt solution by ion exchange. 2+ (5) After filtration and drying, Co molecular sieve solid alkali is obtained; (6) Co molecular sieve solid alkali, ammonium phthalate sulfonate, urea, ammonium molybdate, and phthalic anhydride are added in proportion and ground evenly; (7) The obtained material is heated under an inert atmosphere to react and obtain the catalyst product. In the catalyst prepared by this invention, sulfonated cobalt phthalocyanine is combined with molecular sieve through chemical bonds, the active component has a stronger binding force and a longer service life.

The present application belongs to the field of polymer materials, and particularly relates to a self-toughened epoxy resin with high temperature resistance and a preparation method thereof. The modifier is a multifunctional epoxy resin containing a polyetherimide structure. The modifier is dissolved and blended with a bisphenol A type epoxy resin. The curing agent comprises one or more of methyl nadic anhydride, methyl tetrahydrophthalic anhydride, methyl hexahydrophthalic anhydride, dodecenyl succinic anhydride and pyromellitic anhydride. The curing accelerator comprises one or more of dimethylaminomethylphenol, ortho-hydroxybenzyl dimethylamine, 2,4,6-tris(dimethylaminomethyl)phenol, triethylamine and triethanolamine. The multifunctional epoxy resin containing a polyetherimide structure not only has good solubility in the bisphenol A type epoxy resin, but also can participate in the curing reaction of the bisphenol A type epoxy resin, so that the toughness and temperature resistance of the bisphenol A type epoxy resin can be significantly improved.

The application belongs to the technical field of polymer synthesis, and provides a preparation method of a polyimide covalent organic framework.The application mixes anhydride compounds (one or more of the following: pyromellitic dianhydride, 1,4,5,8-naphthalene tetracarboxylic anhydride and 3,4,9,10-perylenetetracarboxylic dianhydride) and an alcohol solvent to perform pre-reaction to obtain a carboxylic esterate solution; disperses amino blocks (tris(4-aminophenyl)amine, 1,3,6,8-tetrakis(4-aminophenyl)pyrene, etc.) to obtain an amino block dispersion solution; mixes the amino block dispersion solution and the carboxylic esterate solution to perform reaction to obtain the polyimide covalent organic framework.The preparation method of the application can be performed under normal pressure, and the operation is safer; meanwhile, the preparation method of the application is not performed in a sealed tube, and can be used for mass production of the polyimide covalent organic framework.

The invention discloses a preparation method of a bumetanib injection, and belongs to the technical field of medicines. The method comprises the following steps: (1) preparing materials, namely respectively weighing bumetanib, xylitol, sodium dihydrogen phosphate dihydrate, disodium hydrogen phosphate dihydrate and benzoic anhydride modified polyoxyethylated castor oil according to prescription amounts for later use; (2) preparing a solution: weighing water for injection, adding xylitol, sodium dihydrogen phosphate dihydrate and disodium hydrogen phosphate dihydrate according to the prescription dosage in a stirring state, stirring and dissolving, then adding benzoic anhydride modified polyoxyethylated castor oil and bumetanib according to the prescription dosage, and stirring until the materials are completely dissolved; and (3) fixing the volume: supplementing the water for injection to the total amount of the prescription, and uniformly stirring and mixing. According to the bumetanib injection disclosed by the invention, the polyoxyethylated castor oil is modified by benzoic anhydride, so that the dissolution rate of bumetanib is effectively improved, and meanwhile, the high-temperature and illumination stability of the bumetanib injection is remarkably enhanced.

This invention belongs to the field of stone adhesive technology, specifically relating to a transparent stone splicing adhesive and its preparation method. The adhesive comprises a resin component and a curing component. The resin component includes maleic anhydride, phthalic anhydride, diol, catalyst, polymerization inhibitor, and crosslinking monomers, etc., and the diol includes at least 1,2-propanediol. The curing component includes an accelerator composed of dimethylaniline and zinc adipate, and a benzoyl peroxide initiator. The adhesive of this invention is colorless and transparent after curing, exhibits excellent resistance to yellowing, is easy to apply, and after curing with fillers, possesses excellent shear strength, water shear strength, and impact resistance. It can be widely used in high-end stone splicing, repair, and craft bonding.

The application relates to a preparation method of a flame-retardant modified polyisocyanate, and belongs to the technical field of polyurethane elastomers. Nano-composite flame retardants are chemically grafted through the reaction of hydroxyl groups and isocyanate groups in polyisocyanate segments, can be uniformly dispersed in a hydrophilic system, and avoid agglomeration and sedimentation caused by physical mixing. Not only is the dispersibility of the nano-composite flame retardants in polymers improved, but also the interfacial bonding force between the two is improved. 2,2-dimethylol propionic acid is covalently grafted to the polyester side chain of the polyisocyanate through the esterification reaction of hydroxyl groups, pyromellitic anhydride and trimethylolpropane, is converted into a carboxylate after neutralization, and the dispersibility in water is improved. The branched main chain of the comb-shaped polyisocyanate and the side chain polyester unit form a large steric hindrance, further weaken the van der Waals force between molecules, enhance the repulsion between particles, avoid molecular aggregation, and make the flame-retardant modified polyisocyanate form a stable and uniform dispersion liquid in deionized water.

The invention belongs to the field of synthesis of electrode materials, and particularly relates to a one-dimensional chain polymer with multiple active sites as well as a preparation method and application of the one-dimensional chain polymer. The polymer is prepared by carrying out dehydration condensation reaction on 1, 8, 4, 5-naphthalene tetracarboxylic anhydride and 2-nitro-1, 4-phenylenediamine in an inert atmosphere, and after the reaction is finished, washing with deionized water and carrying out suction filtration to obtain a target product. The molecular structure of the material simultaneously contains multiple oxidation-reduction active centers such as carbonyl and nitryl, so that efficient Zn / collaborative storage can be realized. When being used as a positive electrode of a zinc ion battery, the composite material shows high discharge capacity and long cycle stability, and an assembled flexible battery also has high volume energy density, excellent repeated bending resistance and chemical self-charging capacity in air, and has wide application potential in the field of wearable electronic equipment. The synthesis process is simple, raw materials are easy to obtain, reproducibility is good, and the method is suitable for large-scale production.

The invention relates to the technical field of functional dyes, and particularly discloses an ultraviolet-light-resistant dye and a preparation method and application thereof.The preparation method of the ultraviolet-light-resistant dye comprises the following steps that S1, 4, 5-quinoline diamine, 4-amino-1, 8-naphthalic anhydride, glacial acetic acid and an organic solvent are mixed and then heated and stirred for a reaction, a solid is obtained through filtering, and the solid is dried; washing with water and ethanol, and drying to obtain a dye intermediate A; and S2, stirring the dye intermediate A with 4-chloro-3 ', 5'-dimethyl-4 '-methoxybenzophenone, an organic solvent and a catalyst at room temperature to react, pouring the reaction liquid into water after the reaction is ended, separating, filtering to obtain a solid, recrystallizing, and drying to obtain the ultraviolet-resistant dye. The problems of migration and compatibility of the dye are solved, and meanwhile, excellent coloring performance and light stability are kept.

The invention relates to the technical field of functional food active substance delivery, in particular to a high-dispersion-phase aqueous two-phase emulsion based on amphiphilic chitosan colloidal particles as well as a preparation method and application of the high-dispersion-phase aqueous two-phase emulsion. Chitosan reacts with phthalic anhydride to obtain a phthalic anhydride modified chitosan polymer; inducing the phthalic anhydride modified chitosan polymer to form a phthalic anhydride modified chitosan colloidal particle dispersion liquid; dialyzing the phthalic anhydride modified chitosan colloidal particle dispersion liquid in an aqueous solution, and removing the organic solvent to obtain a phthalic anhydride modified chitosan colloidal particle aqueous dispersion liquid; the preparation method comprises the following steps: dissolving polyethylene glycol in a phthalic anhydride modified chitosan colloidal particle aqueous dispersion to obtain a polyethylene glycol phase, dissolving dextran in ultrapure water to obtain a dextran phase, and mixing the polyethylene glycol phase with the dextran phase to obtain a dextran-polyethylene glycol aqueous two-phase emulsion. The problem of low loading capacity of the traditional emulsion is solved, and meanwhile, the stability of active substances is improved.

The application discloses a kind of thermal stable reworkable polysiloxane elastomer based on silicon ether bond and preparation method thereof, polysiloxane and tetraacid dianhydride are dispersed in solvent respectively, chain extender, tetraacid dianhydride, polysiloxane and modifier are added in sequence and are fully reacted under inert protective atmosphere, then drop in complexing agent, pour into mould after being dispersed uniformly, obtain uncrosslinked product, temperature is raised to 140-200 DEG C and is kept for 5-10h, so that imidization and silicon ether crosslinking occur, then naturally cool to room temperature, obtain target elastomer.The technical scheme of the application reacts amino-terminated polysiloxane with pyromellitic anhydride to obtain polysiloxane long chain, introduces Fe 3+ Coordination bond is used as sacrificial bond to enhance mechanical properties; then dynamic silicon ether bond is used to form dynamic crosslinking network inside material, and polysiloxane elastomer material with good mechanical properties, thermal stability and reworkability is prepared.

The invention relates to the technical field of alkyd resin-based rusty anti-rust coatings, and particularly discloses a rusty anti-rust coating and a preparation method thereof. The on-rust anti-rust coating comprises the following raw materials: composite modified resin, an emulsifier, a filler, an anti-rust pigment and a rust conversion agent, the composite modified resin is prepared by modifying alkyd resin, coumarone resin and polyether polyurethane resin through maleic anhydride; the alkyd resin comprises the following raw materials: polyol, phthalic anhydride, terephthalic acid, soybean oil fatty acid and a high-flash-point aromatic solvent. A composite system of alkyd resin, coumarone resin and polyether polyurethane resin realizes comprehensive improvement of adhesive force, corrosion resistance, constructability and environmental adaptability through advantage complementation, and is matched with an emulsifier, a filler, an anti-rust pigment and a rust conversion agent, so that the adhesive force to a rusty substrate and the corrosion resistance of the coating are remarkably improved, and the service life of the coating is prolonged. And the method has remarkable technical economy and market application potential.

The invention provides conductive hydrogel and a preparation method thereof, and belongs to the technical field of hydrogel. The preparation method comprises the following steps: firstly, modifying beta-lactoglobulin by using 3-hydroxyphthalic anhydride (3-HPA), then preparing a 2-acrylamido-2-sodium methylpropanesulfonate (AMPS) precursor solution, and then adding the 3-HPA modified beta-lactoglobulin into an AMPS precursor, so as to obtain the conductive hydrogel. Firstly, beta-lactoglobulin is freeze-dried, competitive reaction of water molecules and 3-HPA is avoided, DMSO is used as a solvent when the beta-lactoglobulin is modified by 3-HPA, the problem that the solubility of 3-HPA in water is extremely low and acid anhydride is possibly hydrolyzed in advance is solved, the 3-HPA modified beta-lactoglobulin is added into an AMPS system, the conductivity of gel is enhanced, piezoelectric output is improved, and the piezoelectric effect is improved. The prepared hydrogel has high ion transmission performance and network strength, meanwhile, the material system is biocompatible, and the hydrogel can be applied to the field of health monitoring.

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 invention relates to the technical field of preparation of chemical raw materials, in particular to a preparation process of tetrachlorophthalic anhydride, which comprises the following steps: S1, adding phthalic anhydride, chlorine, chlorosulfonic acid and a modified iodine catalyst into a reaction kettle for chlorination reaction to obtain a reacted material; and S2, transferring the reacted material into a crystallization kettle, carrying out cooling crystallization, introducing compressed air to recover chlorosulfonic acid, and carrying out temperature-controlled washing, centrifugal dewatering and drying to obtain a tetrachlorophthalic anhydride product. According to the preparation process, the iodine loss rate can be remarkably reduced, the catalytic efficiency and the reaction selectivity are improved, and finally high-purity and high-yield tetrachlorophthalic anhydride is prepared.

The invention discloses an indoor moisture-proof and water-resistant gypsum board and a preparation method thereof, and belongs to the technical field of gypsum board preparation. The preparation method of the indoor moisture-proof and water-resistant gypsum board comprises the following steps: S1, uniformly mixing building gypsum, modified fluorgypsum, deionized water, a polyester adhesive, a composite water reducing agent, blast furnace slag powder and the like to obtain gypsum slurry; s2, the gypsum slurry is flatly laid on the first layer of surface protection paper, the second layer of surface protection paper is flatly laid on the gypsum slurry, compaction, final setting and drying curing are conducted, and the indoor damp-proof and water-resistant gypsum board is prepared; wherein the composite water reducing agent is obtained by carrying out a reaction on ethyl vinyl ether, trichlorofluoroethylene and allyl trimethoxy silane; the polyester adhesive is obtained by reaction of allyl alcohol, phthalic anhydride and triallyl cyanurate; the prepared gypsum board not only has good moisture-proof and water-resistant performance, but also has good mechanical performance, the service life of the gypsum board is prolonged to a certain extent, and meanwhile the quality of the gypsum board is guaranteed.

The invention relates to the technical field of composite materials, in particular to a low-temperature medium leakage prevention carbon fiber composite material with self-repairing and self-adaptive sealing functions and a preparation method and application thereof. The preparation method of the composite material comprises the following steps: S1, adding 4, 4 '-diaminodiphenyl ether and 3, 5-diaminobenzoic acid-3-trifluoromethyl phenyl ester into dimethylacetamide, stirring, then adding 4, 4'-hexafluoroisopropyl phthalic anhydride, stirring, heating to room temperature, and continuously stirring to obtain fluorine-containing side chain polyimide; adding an MXene dispersion liquid into the fluorine-containing side chain polyimide to obtain a polyimide adhesive film layer, S2, preparing a carbon fiber bearing layer; s3, adding an aromatic disulfide bond repairing agent into water, then adding isophorone diisocyanate and polyether amine for reaction, and then mixing with polyethylene glycol terephthalate to prepare a self-repairing impermeable layer; s4, preparing a double-layer gradient film; and S5, preparing the carbon fiber composite material.

The application discloses a novel dimer-induced AIE smart material and application thereof, and a preparation method thereof, which comprises the following steps: mixing 4-methyl phthalic anhydride, 2-hydrazinyl benzothiazole and glacial acetic acid to react, and obtaining the novel dimer-induced AIE smart material. The novel dimer-induced AIE smart material is used as a probe to detect triethylamine and dichloromethane. The novel dimer-induced AIE smart material is used as an emission probe to quantitatively detect Zn 2+ . The novel dimer-induced AIE smart material can be used for on-site evaluation of freshness of beef and shrimps, and can be used for detection of Zn 2+ in a biological system.