50 results about "Aromatic acid" patented technology

The invention is directed to a process for the preparation of an aromatic acid or a phenolic compound, said process comprising reacting a dienophile and a furanic compound comprising an acetal moiety in a Diels-Alders reaction to obtain an aromatic compound comprising said acetal moiety, followed by hydrolysis and oxidation of said acetal moiety into a hydroxide or carboxylate moiety to form the aromatic acid or phenolic compound, wherein said dienophile is selected from the group consisting of alkylenes, acetylenes, acrylates, maleates, fumarates, maleimides, propiolates, acetylene dicarboxylates, and benzynes and wherein said acetal moiety is bound directly to the 2-position of the furanic compound.

The invention discloses amino-terminated hyperbranched polyamide acid as well as a preparation method and application thereof. The amino-terminated hyperbranched polyamide acid is formed by polymerizing an aromatic anhydride monomer, an aromatic triamine monomer and an aromatic diamine monomer; the mole numbers of the aromatic anhydride monomer, the aromatic triamine monomer and the aromatic diamine monomer are a, b and c respectively, a: (b + c) = 1: 1-1: 1.5, and the proportion of b to c is any proportion. The amino-terminated hyperbranched polyamide acid disclosed by the invention not only has abundant terminal amino groups, but also contains a large number of polar groups such as ether bonds, imidazole rings, amide groups and carboxyl groups in molecular chains. Therefore, a stable water-based colloid emulsion can be formed in the presence of water and a small amount of organic solvent, other auxiliaries are not needed, and the interface performance and the mechanical performance of the composite material can be greatly improved.

Provided is a novel compound that can achieve both dielectric properties and desmearability after curing. A radical polymerizable group-containing ester compound according to an embodiment comprises: an ester bond-containing molecule that consists only of one or more first units which each have a structure derived from a polyphenylene ether having hydroxy groups at both terminals, and one or more second units which each have a structure derived from a bifunctional or trifunctional aromatic acid halide and which are bonded to the first units by ester bonds; and a radical polymerizable group that is added to each molecular terminal of the ester bond-containing molecule.

We provide a water-based resin. [Solution] The aqueous resin is an ammonium salt formed by reacting an aromatic acid with an alkaline compound neutralization ring-opening intermediate compound. The alkaline compound neutralization ring-opening intermediate compound is formed by neutralizing the ring-opening intermediate compound with an alkaline compound, and the ring-opening intermediate compound is formed by carrying out a ring-opening reaction of a copolymer containing maleic anhydride using a tertiary amino alcohol. The chemical structures of the copolymer containing maleic anhydride, the tertiary amino alcohol, and the aromatic acid are as follows (wherein the formulas, the symbols are as defined in the specification). TIFF2026092659000036.tif25129

The application discloses a modified phthalocyanine pigment, a liquid colorant and a preparation method and application thereof, and belongs to the technical field of pigments and colorants. The modified phthalocyanine pigment comprises the following components in percentage by weight: phthalocyanine pigment 90-99%, pigment derivative 1-10%. The pigment derivative is prepared by sulfonating the phthalocyanine pigment and then modifying the sulfonated phthalocyanine pigment by using a compound containing an amino group and a hydroxyl group and an aromatic acid. The pigment derivative has a benzoate structure. The liquid colorant comprises the following components in percentage by weight: carrier resin 55-90%, modified phthalocyanine pigment 10-40%, and functional additive 0-5%. The liquid colorant prepared by using the modified phthalocyanine pigment has small particle size, low viscosity and good storage stability. When the liquid colorant is applied to in-situ polymerization of polyester, the colored polyester fiber prepared has uniform color, and has good breaking strength, breaking elongation, soaping fastness and rubbing fastness.

The invention provides POE (Polyolefin Elastomer) type refrigerating machine oil adaptive to an R32 refrigerant and a preparation method of the POE type refrigerating machine oil. The preparation method comprises the following steps: firstly, carrying out first-stage esterification reaction on pentaerythritol, aromatic acid, C14-C18 straight-chain fatty acid and a first part of C4-C8 branched-chain fatty acid under the action of a solid acid catalyst; and then adding a second part of C4-C8 branched chain fatty acid to carry out second-stage esterification reaction to obtain the POE type refrigerating machine oil, the molar ratio of the pentaerythritol to the aromatic acid to the C14-C18 straight-chain fatty acid to the first part of the C4-C8 branched-chain fatty acid is 1: (0.5-1.5): (0.5-0.8): (0.5-1.0); and the molar ratio of the pentaerythritol to the second part of C4-C8 branched chain fatty acid is 1: (1.2-2.2). The refrigerating machine oil has good intermiscibility with an R32 refrigerant.

This application relates to a corrosion inhibitor for coolants, a method for preparing the same, and a coolant. The corrosion inhibitor comprises: 1 wt% to 5 wt% fatty acid, 0.05 wt% to 0.5 wt% aromatic acid, 0.1 wt% to 1.0 wt% benzotriazole derivative, and 0.1 wt% to 1.0 wt% additives. The benzotriazole derivative has the structural formula shown in Formula I below. In Formula I, R1 to R4 are each independently selected from at least one of fluorine, substituted or unsubstituted C1 to C5 alkyl groups. When substituted, the substituent is selected from fluorine. The corrosion inhibitor for coolants provided in this application, comprising a benzotriazole derivative, can form stable coordination bonds with metal ions in the coolant, thereby reducing the flow resistance of the coolant while improving its corrosion inhibition performance.

This invention discloses a nickel oxide-doped manganese dioxide catalyst, its preparation method, and its application. The catalyst is prepared by in-situ growth of nickel oxide-doped manganese dioxide on a carbon felt substrate using a solvothermal method. In the application, the catalyst electrode is used as the anode, and an aromatic compound is dissolved in an acidic solution as the anolyte. A counter electrode is used in the cathode chamber, and an acidic solution is used as the cathode reaction solution. After the reaction, an aromatic aldehyde or aromatic ketone can be obtained through a post-treatment process. The catalyst of this invention has a high surface area and porous structure, which increases the specific surface area of ​​the electrode, providing a large number of reaction sites and active sites for the oxidation of the substrate. In addition, the doping of nickel oxide provides more active sites for manganese dioxide, promoting the formation of intermediates and also promoting the desorption of the aromatic aldehyde product, preventing the formation of aromatic acids due to over-oxidation. Furthermore, the nanorod-like three-dimensional structure of the catalyst is beneficial for mass transfer.

The invention discloses a catalyst for synthesizing dimethyl isophthalate as well as a preparation method and application of the catalyst, and belongs to the technical field of preparation of dimethyl isophthalate. The preparation method disclosed by the invention comprises the following steps: S1, adding a carbohydrate compound and a pore-forming agent into water, and carrying out rotary evaporation to obtain a mixed solid; s2, carbonizing the mixed solid to obtain a porous carbon-based carrier; s3, putting the porous carbon-based carrier, a sulfonating agent and water into a reaction kettle, and sulfonating to obtain the catalyst. When the catalyst obtained through the method is used for preparing dimethyl isophthalate, generation of by-products can be reduced, emission of waste water, waste gas and waste residues can be reduced, meanwhile, the strong acid corrosion risk is avoided, the green chemistry principle is met, and an environment-friendly solution is provided for production of aromatic acid ester compounds.

The present invention relates to a mixture, blend or combination, comprising at two, preferably at least three, chosen from the following compounds: (A) a pyrone derivative, (B) a tropolone derivative, (C) a phenylpropanoid, (D) a monoterpene or monoterpenoid, (E) an aromatic acid or salt, (F) a dipeptide, and (G) an alkanediol, and its use as chelating mixture.

OCULAR KERATINOUS MATERIAL COATING COMPOSITIONS The invention relates to ocular keratinous material coating compositions comprising water, at least one film-forming agent with a low glass transition temperature (Tg), at least one salt of an aromatic acid, and optionally at least one nonionic amphiphilic thickening agent, as well as methods for using such compositions and kits containing such compositions. Figure for abstract: none

This invention belongs to the field of biochemical technology, specifically disclosing a 6′- O A whole-cell biosynthesis method for caffeoyl arbutin and its analogues includes the following steps: using aromatic carboxylic acids and vinyl acetates as substrates, performing a transvinylation reaction under palladium catalyst and base conditions to prepare aromatic vinyl esters; using the prepared aromatic vinyl esters as acyl donors, ... β Arbutin, using acyl acceptors, undergoes an aromatic acylation reaction in an organic solvent with whole cells of Aspergillus oryzae as a catalyst to yield the 6′- O Caffeoyl arbutin or its analogues. This invention develops a two-step whole-cell catalytic method for the efficient and sustainable synthesis of CA and its analogues. The synthesized compounds exhibit potent inhibitory activity against mushroom tyrosinase. This invention pioneers a novel green biosynthetic pathway for tyrosinase inhibitors, demonstrating significant application potential in the food preservation and cosmetics industries.

The invention relates to a catalyst for selective aromatic ring hydrogenation of aromatic acid esters, and a preparation method comprises the following steps: loading a Ni source and a Cu source on a composite carrier by an impregnation method to obtain an oxidation-state catalyst; and reducing the obtained oxidation-state catalyst in a hydrogen atmosphere to obtain the catalyst for selective aromatic ring hydrogenation of aromatic acid ester. According to the method, efficient conversion of bio-based aromatic acid ester is achieved, industrial production of the reaction is facilitated, the method is used for replacing existing petrochemical products, dependence on fossil resources is reduced, and the application range of biomass is widened.

The invention provides pentaerythritol ester base oil and a preparation method thereof. The preparation method comprises the following steps: S1, mixing pentaerythritol, mixed acid and a decolorizing agent, and carrying out autocatalytic esterification under a negative pressure condition to obtain a pentaerythritol ester base oil crude product; s2, filtering the pentaerythritol ester base oil crude product, and then performing deacidification and dehydration treatment to obtain pentaerythritol ester base oil; wherein the mixed acid is composed of monobasic fatty acid, dibasic fatty acid and aromatic acid in a molar ratio of (50-70): 1: (2-5); the molar ratio of the pentaerythritol to the mixed acid is 1: (3.8-5.2). The pentaerythritol ester base oil provided by the invention has a high flash point, a low pour point and a wide use temperature range.

The invention discloses vinyl silicone oil and a preparation method thereof, and belongs to the technical field of organic silicon materials. The preparation method comprises the following steps: carrying out vacuum molecular distillation and purification on raw materials, preparing a bidentate carboxylate ligand from hydroxyl-carboxyl bidentate substituted aromatic acid, carrying out ion exchange on the bidentate carboxylate ligand and P5 < + > Cl <-> to prepare a P5 < + >-L catalyst, finally catalyzing ring-opening copolymerization of D4, D4Vi and an end-capping reagent, and carrying out glacial acetic acid quenching, stepped vacuum devolatilization and filtration to obtain the product. The product is applied to the fields of high-end electronics, medical use and the like. In order to overcome the defects of poor catalyst selectivity, non-uniform vinyl distribution and high residue in the prior art, the invention provides a bidentate ligand phosphazene salt catalytic system, realizes selective polymerization of monomers through the synergistic effect of bidentate coordination and zwitterions, solves the problems of continuous blocks of MeViSiO units, metal residues and excessive volatile impurities, and improves the yield of the catalyst. The product is high in purity and stable in performance, and meets the requirements of high-end fields.

This invention discloses a system and process for extracting aromatic acids from the oxidation residue of PTA production. The system includes a residue dryer, a primary mill, a secondary mill, a first collector for collecting benzoic acid, and a second collector for collecting isophthalic acid. The primary mill has a conical shell that is wider at the top and narrower at the bottom. A vertical rotating shaft is installed at the center of the conical shell, and several grinding wheels distributed from top to bottom are mounted on the vertical rotating shaft. The top of the conical shell has a feed pipeline connected to a drying tank and a first gas phase pipeline connected to the first collector. The bottom of the conical shell has a second slag discharge pipeline connected to the secondary mill. This invention, by using a primary and secondary mill and employing a sublimation grinding method to extract benzoic acid and isophthalic acid, ensures extraction purity, improves sublimation efficiency, and increases the extraction yield of benzoic acid and isophthalic acid. The process described in this invention is simple, has low input and operating costs, reliable performance, and high purity.

This invention discloses a method for large-scale preparation of fluorescent carbon dots (CDs) with different fluorescence emission using solvent engineering. The method includes the following steps: using aromatic anhydride derivatives and aromatic amine derivatives as raw materials, and controlling the raw material ratio and reaction time via a one-step microwave-assisted method, four CDs emitting fluorescence ranging from blue to red were prepared, with fluorescence quantum yields of 28.6%, 26.8%, 20.9%, and 7.8%, respectively. By amplifying the reactants, CDs can be prepared on a large scale under ambient pressure, enabling the mass production of fluorescent CDs with different wavelengths. The fluorescent CDs with different wavelengths prepared by this invention possess abundant surface functional groups, high fluorescence quantum yields, uniform particle size distribution, and biocompatibility. They can be synthesized in large quantities in a short time and can be widely applied in fields such as analytical detection, information encryption, cell imaging, and disease diagnosis and treatment.

The invention relates to the technical field of coatings, in particular to polyester resin formed based on Michael addition, a preparation method of the polyester resin and a powder coating. The polyester resin comprises a malonate-containing polyester main chain and an alpha, beta-unsaturated aromatic acid side chain group, and the malonate-containing polyester main chain is bonded with the alpha, beta-unsaturated aromatic acid side chain group. The polyester resin not only has a high acid value, but also has a high molecular weight, and a'gel 'phenomenon in a production process is avoided.

This invention provides an aqueous resin, which is an ammonium salt formed by the reaction of an aromatic acid with a base-neutralized ring-opening intermediate. The ring-opening intermediate is formed by the ring-opening reaction of a copolymer containing maleic anhydride with a tertiary amino alcohol. The chemical structure of the maleic anhydride-containing copolymer is as follows, wherein R... 1 For H or CH3, R 2 The chemical structure of a tertiary amino alcohol is H, CH3, or C6H5, with m:n = 1:3 to 3:1, and n = 4 to 20. 3 C 1‑10 alkylene, R 4 For H, C 1‑10 alkyl, or C 6‑12 The aromatic group, and R 5 and R 6 Each independently is C 1‑10 alkyl or C 6‑12 The aromatic group. The chemical structure of aromatic acids is R. 7 For H, C 1‑10 alkyl, or C 6‑12 The aromatic group, and R 8 It is C 1‑5 Alkylene or...

The invention discloses a liquid crystal polymer and a preparation method thereof, a liquid crystal composition, a film and a communication assembly. The liquid crystal polymer is obtained by polymerizing lignin and monomers comprising hydroxyl aromatic acid, hydroxyl aromatic amine and aromatic dicarboxylic acid, and the liquid crystal polymer prepared by the invention can be dissolved in an aprotic solvent, so that the technical problem that a traditional liquid crystal polymer is difficult to process in the processing process is solved; according to the present invention, the application of the liquid crystal polymer in the high-frequency and high-speed communication device is achieved, the signal transmission capability of the communication device is improved, the prepared liquid crystal polymer has characteristics of extremely low water absorption and excellent heat resistance, and the reliability of the communication device can be improved.

The invention provides diamond wire cutting cooling liquid for silicon carbide wafer cutting, and particularly relates to the field of silicon carbide cutting liquid. The cutting coolant comprises the following components in parts by weight: 5-20 parts of polyol ester, 10-30 parts of fatty alcohol polyoxyethylene polyoxypropylene ether, 0.5-15 parts of poly (4-vinyl benzyl-tri (2-cyanoethyl) phosphonium chloride, 1-5 parts of a catalyst, 1-5 parts of a defoaming agent and 1-5 parts of an antioxidant. The cleaning agent is prepared from the following components in parts by weight: 0.01 to 1 part of aromatic acid, 0.05 to 2 parts of macromolecular viscosity modifier, 0.05 to 5 parts of zinc dialkyl dithiophosphate, 2 to 20 parts of alkynediol gemini surfactant, 0.1 to 2 parts of pH regulator, 0 to 20 parts of organic solvent, 0.02 to 2 parts of organic silicon defoaming agent and 10 to 50 parts of deionized water. The diamond wire cooling liquid for silicon carbide wafer cutting provided by the invention has the characteristics of large boundary lubricating film thickness and high boundary lubricating film strength. The cutting mode of the silicon carbide wafer from the diamond powder abrasive mortar and the steel wire is replaced by the diamond wire cutting mode, and the purposes of improving the cutting efficiency, reducing TTV, improving surface line marks and reducing the smudginess rate are achieved.

We provide a polyimide film that possesses high elongation, low stress, and a high thermal decomposition temperature. [Solution] A polyimide film comprising a polyimide containing structural units derived from aromatic acid dianhydrides and structural units derived from diamines, characterized in that it does not have a clear yield point in its stress-strain curve.

The present invention relates to a mixture, blend or combination, comprising at two, preferably at least three, chosen from the following compounds: (A) a pyrone derivative, (B) a tropolone derivative, (C) a phenylpropanoid, (D) a monoterpene or monoterpenoid, (E) an aromatic acid or salt, (F) a dipeptide, and (G) an alkanediol, and its use as chelating mixture.

The application provides a fluorine-containing aromatic acid ligand modified zirconium metal oxide nanocluster photoresist material and a preparation method and application thereof. The preparation method of the fluorine-containing aromatic acid ligand modified zirconium metal oxide nanocluster photoresist material comprises the following steps: mixing a Zr6O4(OH)4(MAA) 12 solution and a fluorine-containing aromatic acid ligand compound solution, reacting, rotary evaporation and drying to obtain the fluorine-containing aromatic acid ligand modified zirconium metal oxide nanocluster photoresist material. The preparation method is simple, raw materials are cheap and easy to obtain, and the cost is low, and the method is suitable for industrial production. The fluorine-containing aromatic acid ligand modified zirconium metal oxide nanocluster photoresist material can be applied to ultraviolet lithography, electron beam lithography and extreme ultraviolet lithography, and the formed lithography pattern has the advantages of low line edge roughness and high resolution, and has a wide application prospect.

The present application relates to the technical field of chemical engineering, and discloses a method for preparing aromatic aldehyde and aromatic acid from lignin. The method comprises the following steps: mixing lignin raw material with a heterogeneous solid catalyst, and generating aromatic aldehyde and aromatic acid through oxidative cleavage reaction; the lignin raw material contains C-type and G / S-type lignin; and the heterogeneous solid catalyst comprises nitrogen-doped activated carbon loaded with transition metal. The method provided by the present application uses waste seed shells of Euphorbiaceae plants rich in C / G / S-type lignin as raw material, has low raw material cost, and uses a heterogeneous solid catalyst which has low preparation cost and can be effectively separated from the product. The catalytic activity of the catalyst in the oxidative cleavage reaction is high. The method is a green and efficient method for preparing aromatic aldehyde and aromatic acid based on biomass, and is suitable for industrial production. The method provided by the present application can obtain valuable aromatic aldehyde and aromatic acid with high yield, and can be applied to the fields of food and medicine to meet market demand.

The present invention relates to a mixture, blend or combination, comprising at least two, preferably at least three, chosen from the following compounds: (A) a pyrone derivative, preferably a 3-hydroxy-4-pyrone, (B) a tropolone derivative, (C) a phenylpropanoid, (D) a mono- or sesquiterpene, or mono- or sesquiterpenoid, (E) an aromatic acid or salt, and (F) an alkanediol, and its use as antimicrobial mixture, blend or combination.

The invention discloses aromatic acid salt of apolipoprotein E mimetic peptide as well as a preparation method and medical application of the aromatic acid salt. The aromatic acid salt, namely the compound ZYH-76, regulates and controls miR-29a-5p, inhibits an iNOS / HMGB1 / TLR4 / MMP-9 signal channel, reduces polarization of A1 type astrocytes, promotes polarization of A2 type astrocytes and protects the integrity of a blood-brain barrier, so that hemorrhagic transformation (HT) after acute ischemic stroke is inhibited. The compound ZYH-76 has a remarkable drug effect in various HT animal models, excellent pharmacokinetic properties and high safety, can be prepared into a freeze-dried preparation for injection, is suitable for HT risk prevention and treatment, and has a good clinical application prospect.

The invention discloses a diketopiperazine hydroxyl, amino and aromatic acid substituted derivative and a pharmaceutical composition, and belongs to the technical field of medicines. The technical problem to be solved is to provide a diketopiperazine hydroxyl, amino and aromatic acid substituted derivative with a new structure. The key point of the technical scheme is to provide a compound as shown in a formula I or a formula II, or a pharmaceutically acceptable salt of the compound as shown in the formula I or the formula II, and drug delivery is realized in different modes. Formula I and formula II

The present invention provides a cyanoacrylate composition that improves high-temperature strength performance while maintaining a desirable level of heat resistance. [Solution] A cyanoacrylate composition is provided, comprising (a) a cyanoacrylate component comprising a combination of (i) allyl cyanoacrylate and (ii) another cyanoacrylate selected from the group consisting of methyl cyanoacrylate, ethyl-2-cyanoacrylate, propyl cyanoacrylate, butyl cyanoacrylate, octyl cyanoacrylate and β-methoxyethyl cyanoacrylate, (b) fluorobenzonitrile, (c) hydrogenated aromatic anhydride, and (d) a reinforcing component.