72 results about "Phthalic acid anhydride" patented technology

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 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 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.

The invention discloses corrosion-resistant waterproof aluminum foil glass fabric and a preparation method thereof, and belongs to the technical field of aluminum foil composite glass fabric. The corrosion-resistant waterproof aluminum foil glass fabric sequentially comprises a waterproof glass fabric, a high-temperature-resistant adhesive layer and an aluminum foil from bottom to top, the waterproof glass fabric is obtained by padding a waterproof finishing agent; the waterproof finishing agent is mainly prepared from the following raw material components: a silane coupling agent, hydroxyl-terminated fluorine-containing dihydric alcohol, isophorone diisocyanate and polycaprolactone; the high-temperature-resistant adhesive is mainly prepared from the following raw material components: 4, 4 '-oxydiphthalic anhydride, 4, 4-(hexafluoroisopropyl) bis (p-phenoxy) diphenylamine, 3, 3'-diaminodiphenyl sulfone, 1, 3-bis (3-aminopropyl)-1, 1, 3, 3-tetramethyldisiloxane, 4-amino-2-hydroxybenzaldehyde and o-phenylenediamine, and the high-temperature-resistant adhesive is prepared from the following raw material components: 4, 4 '-oxydiphthalic anhydride, 4, 4-(hexafluoroisopropyl) bis (p-phenoxy) diphenylamine, 4, 4-(hexafluoroisopropyl) bis (p-phenoxy) diphenylamine, 3, 3'-diaminodiphenyl sulfone, 1, 3-bis (3-aminopropyl) The corrosion-resistant waterproof aluminum foil glass fiber cloth prepared by the invention is relatively good in high temperature resistance, corrosion resistance and waterproofness.

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 invention provides a retarder, retarded acid and a preparation method and application thereof, and relates to the technical field of acidification transformation of carbonate reservoirs in oil and gas field development, the retarder comprises the following components in percentage by mass: 50%-70% of a main polymer, 15%-25% of a film-forming acceleration component, 10%-15% of an acid-resistant stable component and 5%-10% of a dispersing aid; the main body polymer is a quadripolymer and is formed by copolymerizing a cationic monomer, a bidentate anchoring monomer, a supramolecular self-assembly monomer and an acid-resistant monomer, the cationic monomer is methacryloyloxyethyl trimethyl ammonium chloride or acryloyloxyethyl trimethyl ammonium chloride, the bidentate anchoring monomer is phthalic anhydride modified acrylate, and the supramolecular self-assembly monomer is a supramolecular self-assembly monomer. The supramolecular self-assembly monomer is carbamido ethyl methacrylate, and the acid-resistant monomer is 2-acrylamide-2-methylpropanesulfonic acid; the retarder is obviously superior to the conventional retarded acid in the aspects of stability, film-forming speed, retarding effect, effective acting distance and reservoir protection.

The invention relates to the technical field of chemical raw material preparation, in particular to a continuous phthalic dicarboxaldehyde preparation reaction device and process. The stirring device comprises a stirring paddle rotationally connected to the axis of the reaction kettle, the top of the reaction kettle is communicated with a feed port, and the bottom of the reaction kettle is communicated with a discharge port; the upper part of the reaction kettle is provided with a pair of stirring paddles, and the stirring paddles are positioned above the liquid level of a reactant and are symmetrically arranged; after heat is generated by reaction, air above reaction liquid expands and rises to penetrate through the heat dissipation holes to reach the position above the protective cover to be in contact with flowing cold air conveyed by the fan for heat exchange, water vapor in the hot air is liquefied into condensed water when meeting cold, and the condensed water flows along the upper surface of the protective cover and is condensed by the fan. And the continuously rising hot air in the heat dissipation holes prevents the condensed water from penetrating through the heat dissipation holes and dripping into the reaction liquid below, so that phthalic anhydride is hydrolyzed into phthalic acid, and the normal proceeding of the subsequent reaction is influenced.

The utility model relates to the technical field of chemical waste recovery, in particular to a phthalic anhydride waste recovery device which comprises a box body and supporting rods, the right side of the lower end of the box body is fixedly connected with the two supporting rods, and the lower ends of the supporting rods on the two sides are movably connected with arc blocks through pin shafts. The lower ends of the arc blocks on the two sides are fixedly connected with a bottom plate, and a pushing device is arranged at the upper end of the bottom plate. According to the phthalic anhydride waste material recovery device, through cooperation of the pushing device and the separation and recovery device, the box body can incline towards one side of the liquid discharge pipe, an operator opens a valve to discharge waste liquid in the box body and opens and collects the discharged waste liquid, a square plate is pulled to drive a frame body to be pulled out, and then the box body is separated and recovered. Solid waste on the surface of the screen plate is collected, the solid waste and liquid waste are independently treated in a targeted mode, solid-liquid separation and temporary storage of the waste can be carried out, and the device is more convenient to use.

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.

The application relates to a new energy graphite heat pipe and a preparation method thereof. The method comprises the following steps: 1) mixing, oscillating and stirring nanographene, N-methyl-2-pyrrolidone and polyether modified polysiloxane to obtain a mixed solution A; 2) weighing 4,4'-oxybisphthalic anhydride and 4,4'-oxydianiline, adding the two into the mixed solution A, heating, stirring for 3-5 hours to obtain a mixture B; 3) weighing N-hydroxyethyl acrylamide, polytrimethylene ether glycol and methylene succinic acid, adding the three into the mixture A, stirring, drying and grinding to obtain modified nanographene; 4) mixing, oscillating and stirring the modified nanographene, water and a settlement preventing agent to obtain a modified nanographene fluid; 5) adopting copper material to make a heat pipe, filling the modified nanographene fluid into the heat pipe, intercommunicating two ends of the heat pipe and forming a closed loop circuit to obtain a graphite heat pipe; the fluid in the graphite heat pipe is not prone to settlement, and the heat conduction performance and practicability are improved.

The application discloses a phthalocyanine cobalt / pyridine nitrogen skeleton substituted phthalocyanine copper / asphalt coke active carbon composite catalytic material and a preparation method and application thereof, and the method comprises the following steps: 1, pyridine-2,3-dicarboxylic acid, urea, ammonium molybdate, copper chloride dihydrate and asphalt coke active carbon are mixed to obtain a mixture A; 2, the mixture A is kept at 100-180 DEG C, and then kept at 200-350 DEG C to obtain a product B; 3, the product B is ground, soaked, washed and dried in sequence to obtain pyridine nitrogen skeleton substituted phthalocyanine copper / asphalt coke active carbon; 4, phthalic anhydride, urea, ammonium molybdate, cobalt chloride hexahydrate and pyridine nitrogen skeleton substituted phthalocyanine copper / asphalt coke active carbon are mixed to obtain a mixture C; 5, the mixture C is kept at 100-180 DEG C, and then kept at 200-350 DEG C to obtain a product D; 6, the product D is ground, soaked, washed and dried in sequence to obtain the phthalocyanine cobalt / pyridine nitrogen skeleton substituted phthalocyanine copper / asphalt coke active carbon composite catalytic material, the purity of the material is high, and the discharge time and voltage of a Li / SOCl2 battery are improved.

The invention relates to the technical field of ceramic glazes, and discloses an anti-glaze-crack antibacterial ceramic glaze and a preparation method thereof.The preparation method comprises the steps that polyethyleneimine and 4-hydroxyphthalic anhydride react to obtain modified polyethyleneimine, then nano titanium dioxide serves as a photocatalytic antibacterial agent and is subjected to ball milling and blending with feldspar, silica powder, calcite and the like, and the anti-glaze-crack antibacterial ceramic glaze is obtained. Glazing and sintering at high temperature to obtain the anti-glaze-crack antibacterial ceramic glaze. A large number of hydroxyl groups, carboxyl groups and o-hydroxybenzoic acid structures are introduced into the modified polyethyleneimine, so that the surface modification and dispersion effects on the nano titanium dioxide are realized, the dispersity of the nano titanium dioxide in the ceramic glaze is improved, more photocatalytic active sites are exposed, and a higher sterilization rate is shown; the modified polyethyleneimine serves as a dispersing agent of the glaze, agglomeration of inorganic particles such as silica powder in the glaze is reduced, the uniformity of the glaze is improved, the quality of a fired glaze surface is improved, and better glaze crack resistance is shown.

The invention relates to a preparation method of biphenyltetracarboxylic dianhydride, and belongs to the technical field of organic synthesis. The method comprises two main steps of S1, dehalogenation coupling-acidification reaction and S2, anhydridation reaction. In the step S1, 4-chlorophthalic anhydride is used as a raw material, is dissolved in a sodium hydroxide solution, is subjected to a dehalogenation coupling reaction with a glycerol aqueous solution under the action of a palladium-carbon catalyst, and is acidified and purified to obtain biphenyltetracarboxylic acid; in the step S2, biphenyltetracarboxylic acid and acetic anhydride are subjected to an anhydridization reaction to generate biphenyltetracarboxylic dianhydride; the palladium carbon catalyst is prepared from activated carbon, nitric acid, methylbenzene, gamma-methacryloxypropyltrimethoxysilane, dibutyltin dilaurate, allylidene triphenylphosphine, ammonium persulfate, a chloropalladic acid solution and formaldehyde; according to the invention, efficient preparation of biphenyltetracarboxylic dianhydride is realized, the product purity is high, the yield is high, and the method is suitable for industrial production.

This application discloses a solid electrolyte separator based on esterified cellulose and its preparation method, specifically including the following steps: first, esterified cellulose derivatives are obtained by modifying cellulose acetate as a base with 4-methylphthalic anhydride; then, the esterified cellulose derivative is dissolved in N,N-dimethylformamide with lithium bis(trifluoromethanesulfonylimide) and succinate, mixed evenly, coated onto a mold, and vacuum dried to obtain the separator. This separator exhibits good mechanical properties and interfacial stability, effectively suppressing lithium dendrite growth and improving battery safety. Lithium metal batteries assembled using this separator demonstrate high discharge specific capacity and good cycle stability, making them suitable for high-energy-density solid-state lithium batteries.

The invention relates to the technical field of organic synthesis, in particular to a preparation method and application of 2-[4-(dihexylamino)-2-methoxybenzoyl] benzoic acid. Comprising the following steps: reacting N, N-dihexyl-3-methoxyaniline with phthalic anhydride in an aprotic solvent by taking Lewis acid as a catalyst, so as to obtain the 2-[4-(dihexylamino)-2-methoxybenzoyl] benzoic acid. By adopting the preparation method disclosed by the invention, high-yield (more than or equal to 88.35%) and high-purity (more than or equal to 99.32%) synthesis of 2-[4-(dihexylamino)-2-methoxybenzoyl] benzoic acid is realized; compared with an existing nucleophilic acyl substitution-hydrolysis method, the yield is 55.62%, and the purity is 75.85%, the yield is improved by 32.73%, and the purity is improved by 23.74%; compared with an existing transition metal catalysis-oxidation method with the yield of 64.94% and the purity of 80.85%, the yield is improved by 23.41%, and the purity is improved by 18.47%.

The invention discloses a synthetic method of L-leucyl-L-glutamine, and belongs to the technical field of organic synthesis. The preparation method comprises the following steps: protecting amino of L-leucine through phthalic anhydride to obtain phthaloyl-L-leucine, and then carrying out chlorination reaction by using a chlorination reagent to obtain phthaloyl-L-leucyl chloride; then carrying out a reaction with L-glutamine so as to obtain phthaloyl-L-leucyl-L-glutamine; then removing a protecting group through hydrazinolysis reaction to obtain an L-leucyl-L-glutamine crude product; and finally, purifying by adopting water as a solvent to obtain the L-leucyl-L-glutamine. According to the invention, cheap L-leucine and L-glutamine are used as raw materials, the synthesis route is simple, water is used as a solvent in the purification process, the use of an organic solvent is avoided, and the obtained product is excellent in purity, high in yield and easy for industrial production.

This application relates to the field of medicinal chemistry, specifically disclosing an antitumor molecular gel compound and its preparation method. It is prepared from the following raw materials: phthalic anhydride or its substituted derivative, a 2-amino-6-substituted benzothiazole derivative, a condensing agent, an organic base, and a polar aprotic solvent. The preparation method is as follows: S1, dissolving the 2-amino-6-substituted benzothiazole derivative and the organic base in a solvent; S2, dissolving the phthalic anhydride or its substituted derivative in the solvent and adding it dropwise to a first mixture to obtain a second mixture; S3, adding the condensing agent to the second mixture; S4, quenching the reaction solution in ice water and extracting with ethyl acetate; S5, separating and purifying the crude product by column chromatography. The compound of this application can be used to develop novel antitumor drugs that target and degrade tumor-related proteins, possessing advantages such as molecular conformational stability, optimized physicochemical properties, hydrophobicity regulation, and enhanced binding affinity.

The application discloses a kind of aliphatic polyketone filter membranes containing fibrous hole and preparation method thereof, belong to membrane separation technical field.A kind of aliphatic polyketone filter membranes containing fibrous hole, aliphatic polyketone is used as main body resin, F-127 and the like are used as hydrophilic modifier, high melting point adipic acid, phthalic anhydride and the like are used as diluent, dispersed uniformly at 160-200 DEG C, after defoaming, form certain shape, obtain the aliphatic polyketone filter membranes containing fibrous hole.The special fibrous hole structure of the aliphatic polyketone filter membranes is different from the classic finger hole and sponge hole structure, has the performance advantage of combining the advantages of both, and POK is low in price, good in hydrophilicity, good in solvent resistance, has good application prospect in membrane filtration field.

A method for the preparation of a 3-nitro-N—(C1-13 alkyl)phthalimide composition comprises reacting a 3-nitro phthalic acid to provide 3-nitro-phthalic anhydride, optionally in the presence of a solvent, and reacting 3-nitro-phthalic anhydride with a C1-13 alkylamine optionally in the presence of a solvent to provide the 3-nitro-N—(C1-13 alkyl)phthalimide composition comprising 3-nitro-N—(C1-13 alkyl)phthalimide and optionally, 4-nitro-N—(C1-13 alkyl)phthalimide. The 3-nitro-N—(C1-13 alkyl)phthalimide composition can have undetectable levels of 4-nitro-N—(C1-13 alkyl)phthalimide, and consequently, polyetherimides ultimately derived from the 3-nitro-N—(C1-13 alkyl)phthalimide composition can be enriched in 3,3′ linkages and / or exclude 3,4′ and 4′4 linkages. The polyetherimides disclosed can have improved flow and a decreased yellowness index.

The invention relates to a method for jacketing elongate articles, such as lines or cable harnesses in particular, by means of an adhesive tape comprising a tape-shaped substrate, which substrate has, on at least one side, a thermally curable, meltable, preferably pressure-sensitive adhesive layer, the adhesive layer comprising an epoxide-functionalized acrylonitrile-butadiene copolymer which has on average more than 1.5 epoxide groups per molecule and comprising the reaction product of phthalic anhydride and diethylene-triamine, the adhesive tape being led in a helix around the elongate article or the elongate article being enveloped by the adhesive tape in the axial direction, the elongate article together with the enveloping adhesive tape being brought into the desired arrangement, in particular into the cable harness plan, the elongate article being held in this arrangement, and the curable adhesive mass being cured by supplying thermal energy, in particular at a temperature of up to 110° C.

The present invention relates to the technical field of lithium-ion battery materials. Disclosed are a cross-linked polyimide lithium battery separator, a preparation method therefor and a use thereof. The preparation method comprises the following steps: (1) adding a diamine monomer and a dianhydride monomer in a molar ratio of 1:(0.7-0.95) to a solvent for reaction, and then adding an accelerator to obtain a polyamic acid-containing slurry; and (2) coating a porous substrate with the slurry, then soaking in a reaction solution to obtain a pre-cured film, and drying the pre-cured film to obtain a cross-linked polyimide lithium battery separator, wherein the reaction solution comprises an end‑capping agent and an organic solvent, and the end‑capping agent is selected from at least one of phthalic anhydride, 4-phenylethynylphthalic anhydride, 4-ethynylphthalic anhydride, phenylethynyl trimellitic anhydride, ethynyl bisphthalic anhydride and methyl ethynylphthalic anhydride. The preparation method can improve the temperature resistance of the separator, ensuring that the separator does not melt and deform at 350°C or less, and improving the tensile strength and puncture resistance of the separator.

This invention relates to a modified talc powder for polylactic acid (PLA) nucleating agents, its preparation method, and its application. Belonging to the field of nucleating agent technology, it is prepared through the following three-step reaction: phthalic anhydride and talc powder are dissolved in an organic solvent, heated and stirred to obtain a homogeneous mixture. After cooling, the precipitate is collected and vacuum-dried to obtain a powder. The obtained powder is dissolved in an aqueous solution of tetraalkylammonium hydroxide, heated under reflux, cooled, and the solid is collected and vacuum-dried to obtain a catalyst. The obtained catalyst is mixed with lactide and an initiator, heated and stirred to react, thoroughly washed, and the solid is collected and vacuum-dried to obtain the modified talc powder for PLA nucleating agents. The preparation method of the nucleating agent of this invention is simple, with mild reaction conditions, convenient operation, and easy industrialization. After melt blending with PLA, it improves the crystallinity of PLA and enhances its thermal properties.

The application provides 4-chlorophthalic acid and a preparation method and application thereof, and belongs to the field of organic synthesis. The application provides a preparation method of 4-chlorophthalic acid, which comprises the following steps: under closed conditions, phthalic anhydride (benzene anhydride), 2-benzyloxy ethanol (benzyl cellulose solvent), trimethylpentane, chlorine and water are mixed to perform chlorination reaction, and the 4-chlorophthalic acid is obtained. In the application, the benzene anhydride is dissolved in water, and the 4-chlorophthalic acid generated in the reaction process has large solubility in the mixed solvent, so that the 4-chlorophthalic acid generated in the water reaction can be timely transferred to the mixed solvent, so that the 4-chlorophthalic acid is avoided from being substituted by chlorine again to generate polychlorinated products, the generation of byproduct is reduced, the problems of high cost and low product yield in the traditional process are solved, and the application lays a foundation for opening the polyimide market for enterprises.

The invention belongs to the technical field of cables, and particularly relates to a polyvinyl chloride fire-resistant power cable and a preparation method thereof. And extruding and granulating the premix to obtain the polyvinyl chloride fire-resistant power cable material. The preparation method of the hybrid modified bisphenol A epoxy resin comprises the following steps: carrying out phosphate esterification reaction on phosphorus trichloride, 3-(vinyloxy) benzene-1, 2-diol and an acid-binding agent to obtain a flame retardant; performing Claisen rearrangement on the flame retardant to obtain a flame retardant precursor, and finally performing addition reaction on the flame retardant precursor and 1, 3-bis (aminopropyl) tetramethyldisiloxane to obtain the heat-stable flame retardant. The preparation method comprises the following steps: pre-curing hybrid bisphenol A epoxy resin with a heat-stable flame retardant, an antioxidant, phthalic anhydride and tetrabutyl titanate under a vacuum condition to obtain hybrid modified bisphenol A epoxy resin; the cable material disclosed by the invention can effectively improve the flame retardance, heat resistance, toughness and interface bonding capacity of the polyvinyl chloride cable.

The invention discloses a synthesis method of a thermosensitive dye pink pigment, and particularly relates to a synthesis method of 9-(ethyl (isoamyl) amino)-3 'H-spiro [benzo [A] xanthene-12, 1'-isobenzofuran]-3 '-ketone. Comprising the following steps: reacting N-(3-hydroxyphenyl) acetamide with borane tetrahydrofuran at 50 DEG C to prepare N-ethyl-3-methoxyaniline, and reacting the N-ethyl-3-methoxyaniline with isovaleraldehyde and acetic acid sodium borohydride to prepare N-ethyl-N-isopentyl-3-methoxyaniline; then refluxing with an HBr / acetic acid system at 100 DEG C to prepare 3-(ethyl (isoamyl) amino) phenol; then reacting with phthalic anhydride at the temperature of 100 DEG C to prepare 2-(4-(ethyl (isoamyl) amino)-2-hydroxybenzoyl) benzoic acid; and reacting the obtained product in methanesulfonic acid or concentrated sulfuric acid at room temperature, and performing post-treatment to obtain a target product. The method is low in reaction temperature, free of byproducts, low in raw material cost and easy to industrialize.

The utility model provides a phthalic anhydride tail gas waste heat recycling system which comprises a catalytic oxidation tail gas emission system which comprises a plurality of tail gas outlet pipelines connected with different tail gas outlets of a catalytic oxidation system; the steam generation system is connected with the tail gas outlet pipelines and used for evaporating desalted water into steam by using waste heat of the tail gas discharged by the tail gas outlet pipelines as a heat source; the adjusting and switching system is arranged on the tail gas outlet pipelines and used for enabling the tail gas to selectively enter different tail gas outlet pipelines and selectively and directly discharge or enter the steam generation system; and the high-temperature condensate water collecting system is connected with the steam generating system and is used for collecting and recycling the high-temperature condensate water generated by the steam generating system. According to changes of production loads and operation conditions, exhaust gas emission paths can be flexibly switched, waste heat in the exhaust gas is effectively recycled, and maximum utilization of the exhaust gas is achieved.