15 results about "Formic anhydride" patented technology

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 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 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.

This invention discloses an amino-functionalized ZIF-8 modified polyimide composite film and its preparation method, belonging to the field of polyimide film technology. The process involves a binary copolymerization reaction of p-phenylenediamine (p-PDA) and biphenyl tetracarboxylic anhydride (BPDA) to obtain a polyamic acid (PAA) solution. Then, amino-functionalized ZIFs (ZIF-8-NH2) are ground and thoroughly mixed with a solvent. After ultrasonic extraction, the mixture is introduced into the aforementioned PAA solution to obtain a PAA / ZIF-8-NH2 composite liquid. After adjusting the molar ratio of the dianhydride and undergoing thermal imidization treatment, the amino-functionalized ZIF-8 modified polyimide composite film is obtained. This invention introduces ZIF-8, which possesses high porosity, large specific surface area, adjustable pore structure, excellent thermal stability, and low thermal conductivity, into the composite film preparation process. Based on this, the ZIF-8 is amino-functionalized, resulting in a composite film material with uniform filler dispersion, ultra-low dielectric constant, low dielectric loss, and excellent thermal insulation performance.

The application relates to the technical field of polyester degradable plastics, in particular to a degradable polyester medical sterilization indicating label material which comprises a base material layer, a sterilization indicating ink layer and a pressure-sensitive adhesive layer; the base material layer comprises polylactic acid resin, modified pyromellitic anhydride ester, modified silane carboxylate and amino siloxane pre-hydrolysis oligomer; the modified pyromellitic anhydride ester, the modified silane carboxylate and the amino siloxane pre-hydrolysis oligomer synergistically act, effectively solve the problems that the existing PLA-based sterilization indicating label is easily degraded under the high-pressure steam sterilization condition due to the residual alkaline cleaning agent, label embrittlement, adhesion loss and indicating function failure, the label resistance in the sterilization environment is improved, the sterilization indicating function of the label is completely preserved, and the comprehensive performance is obviously better than that of the unmodified system and the prior art scheme.

The application discloses a kind of metal organic framework double detection fluorescent sensing materials, which is obtained by the reaction of zirconium-based metal organic framework UiO-66-NH2 and 3-(6-nitro-1,3-dioxo-1H-benzoisoquinoline-2(3H)-yl) propionic acid, and the 3-(6-nitro-1,3-dioxo-1H-benzoisoquinoline-2(3H)-yl) propionic acid is obtained by the reaction of beta-alanine and 4-nitro-1,8 naphthalene dicarboxylic anhydride.The material can realize the double detection of phosphate and hydrogen sulfide, and the concentration change of phosphate in the solution to be measured can be obtained by measuring the fluorescence intensity of the solution at 425nm under the excitation wavelength of 360nm;The concentration change of hydrogen sulfide in the solution to be measured can be obtained by measuring the fluorescence intensity of the solution at 537nm under the excitation wavelength of 435nm, and the detection of the two target detection objects does not interfere with each other, the selectivity and anti-interference ability of the material are strong, the detection sensitivity and accuracy are high, and the detection limit of the two target detection objects is much lower than the concentration range of the two in aquaculture water body.

The application discloses a viscosity reducer for exploitation of deep low-permeability heavy oil reservoirs and a preparation method and application thereof. The preparation method comprises the following steps: (1) under the conditions of existence of a solvent and a catalyst and heating, 4-halogenophthalic anhydride and glycol compounds are subjected to nucleophilic addition reaction under the atmosphere of nitrogen or inert gas to obtain a mixed solution containing intermediate A; (2) diazomethane is introduced into the mixed solution containing intermediate A, and diazomethane and intermediate A are subjected to nucleophilic transfer reaction to obtain a mixed solution containing intermediate B; (3) polyethylene glycol or dimethylaluminum is added into the mixed solution containing intermediate B, and after stirring, sodium sulfite is added, and under the condition of heating, intermediate B and sodium sulfite are subjected to sulfonation reaction of nucleophilic displacement, and after reaction, the viscosity reducer is obtained through post-treatment. The application further discloses application of the viscosity reducer as a displacement flow-increasing viscosity reducer in exploitation of deep low-permeability heavy oil reservoirs.

This invention discloses a preparation process for the co-production of alicyclic epoxy resin and glycidyl ester epoxy resin, comprising the following steps: mixing epoxy resin raw materials, solvent, and hydrogen peroxide; adding acid anhydride to the reaction system in batches; filtering the reaction system after the reaction is completed to separate the liquid phase and by-product acid solid; obtaining alicyclic epoxy resin through a series of operations on the liquid phase; adding wet by-product acid solid and continuing to react with epichlorohydrin to finally obtain the corresponding glycidyl ester epoxy resin; and performing an epoxidation reaction by using cyclic anhydrides such as hexahydrophthalic anhydride and phthalic anhydride in combination with hydrogen peroxide to generate corresponding peroxy acids. The generated by-product dicarboxylic acid and excess raw material anhydride can be directly filtered out from the reaction system and used directly as raw materials for the production of glycidyl ester epoxy resin, thereby achieving the co-production of alicyclic epoxy resin and glycidyl ester epoxy resin.

This invention discloses a method for synthesizing bromhexine hydrochloride, with the following specific steps: Step (1), using 2-amino-3,5-dibromobenzoic acid as a raw material, reacting it with trimethylacetyl chloride via an anhydride method under the action of an acid-binding agent to obtain compound 2-amino-3,5-dibromobenzoic acid anhydride; Step (2), the 2-amino-3,5-dibromobenzoic acid anhydride obtained in Step 1 undergoes nucleophilic addition with N-methylcyclohexylamine to obtain compound 5, bromhexine hydrochloride intermediate; Step (3), the above compound 5, bromhexine hydrochloride intermediate undergoes amide reduction and salt formation reaction to obtain bromhexine hydrochloride. This process provides a new route for preparing bromhexine hydrochloride, avoiding the heavily regulated chlorination process, reducing the release of toxic gases from strong halogen reagents such as thionyl chloride, significantly reducing safety risks and environmental protection investment, and the reaction itself is safe and fast, which is conducive to industrial production.

The invention relates to the technical field of photoresist, in particular to photoresist for a capacitive touch sensor and a preparation process of the photoresist. The invention discloses a preparation process of photoresist for a capacitive touch sensor. The preparation process comprises the following steps: preparing a modified photoreaction agent; preparing modified polyimide resin powder; preparing silicon dioxide hollow carbon spheres and nano titanium dioxide hybrid particles; and preparing the photoresist. The preparation method comprises the following steps: firstly carrying out nitration reaction on 4-tert-butylphenol, then reducing nitryl into amino to obtain amino substituted 4-tert-butylphenol, protecting the amino by di-tert-butyl dicarbonate ester, then oxidizing iodobenzene into a high-valence iodine active intermediate by taking m-chloroperoxybenzoic acid as an oxidizing agent, and reacting with Boc-amino substituted 4-tert-butylphenol to obtain the high-valence iodine-substituted 4-tert-butylphenol. And finally, carrying out a replacement reaction with silver trifluoromethanesulfonate, carrying out deprotection to obtain a modified photoreaction agent, and carrying out a condensation polymerization reaction on the modified photoreaction agent, 4, 4 '-hexafluoroisopropyl phthalic anhydride and the like to generate a polyamic acid prepolymer, so that the photoetching resolution can be greatly improved.

This application relates to the technical field of fiberglass reinforced plastics (FRP), and in particular to an unsaturated polyester resin for FRP, a method for preparing the same, and FRP. The unsaturated polyester resin comprises the following raw materials in parts by weight: diols: neopentyl glycol 22-30 parts, 2,2-diallyl bisphenol A 2-4 parts, and bisphenol fluorene 5-9 parts; diacids: isophthalic acid 5-15 parts, terephthalic acid 5-15 parts; acid anhydrides: phthalic anhydride 3-15 parts, maleic anhydride 5-17 parts; toughening agent: double-ended hydrogen-capped silicone oil 5-9 parts; platinum catalyst: the amount of platinum catalyst added is 30-150 ppm of the total mass of 2,2-diallyl bisphenol A and double-ended hydrogen-capped silicone oil; diluent 25-45 parts; polymerization inhibitor 0.01-0.06 parts. It has the advantage of improving the hardness and toughness of the unsaturated polyester resin, thus enhancing its corrosion resistance.

This invention discloses a high-adhesion toughened epoxy resin adhesive and its preparation method, belonging to the field of epoxy resin technology. The epoxy resin adhesive of this invention comprises the following components by weight: 100 parts epoxy resin, 5-8 parts modified silica, and 100-195 parts modified polyimide curing agent; the modified polyimide curing agent is obtained by linear polycondensation of hydrophobic diamine and pyromellitic anhydride. The modified polyimide curing agent forms a semi-interpenetrating network structure with the epoxy resin, which bears stress and prevents crack propagation; simultaneously, the chain segments dissipate energy through force slippage and tensile stress, improving impact toughness; the polar imide bonds in the structure, in conjunction with the hydroxyl groups generated by the crosslinking of epoxy resin and curing agent, impart strong adhesive strength; the hydrophobic fluorosilicone segments form a continuous hydrophobic interface, resulting in a highly dense adhesive layer that effectively blocks moisture intrusion and maintains long-term high adhesive strength, making it suitable for use in electronic device encapsulation materials.

Methods and related compositions for the synthesis and purification of pyromellitic dianhydride are provided. The method comprises obtaining a solid composition. The solid composition comprises at least one of a pyromellitic anhydride, a pyromellitic acid, or any combination thereof. The method comprises heating the solid composition at a temperature and a pressure sufficient to convert at least one of the pyromellitic anhydride, the pyromellitic acid, or a combination thereof to a reaction product. The reaction product comprises a pyromellitic dianhydride having a purity of at least 99.9% as measured by 1H NMR.

The present application relates to the field of photocatalysis and polymer materials, in particular to a novel porous polymer and a preparation method and application thereof.The porous polymer material is obtained by reaction of naphthalene tetracarboxylic anhydride as an acceptor unit and tri(4-aminophenyl)amine as a donor unit; the porous polymer has a structural unit shown in formula 3: formula 3.The porous polymer can precipitate U(VI) in the form of solid (UO2)O2(H2O)2 under light conditions and thus remove U(VI), and can be used in the field of removing uranium from nuclear waste water.