42 results about "Carboxylic acid" patented technology

A composite structure having a number of thermoset resin containing elements and a number of thermoplastic elements and at least one interface between the thermoset resin containing elements and the thermoplastic elements is provided. The thermoset resin containing elements and the thermoplastic elements have functional groups at the interface which bond to each other when the composite structure is cured and the functional groups are independently selected from amines, carboxylic acids, acid anhydrides, oxiranes, and derivatives thereof in their non-bonded condition. Additionally, a blade having such a composite structure is provided.

A process is provided for preparing spiro-hydantoin compounds of the formula II

wherein Z is N or CR_4b; K and L are independently O or S; Ar is an optionally substituted aryl or heteroaryl; A₂ is a linker, G′ is a linker; Q is a linker; and R₂, R_4a, R_4c, and R_h are defined in the specification. The process optionally includes the enantiomeric separation of intermediates to allow preparation of enantiomers of the spiro-hydantoin compounds of formula II. Substituted spiro-hydantoin compounds may be prepared from the spiro-hydantoin compounds of formula II. The spiro-hydantoin compound of formula II and the substituted spiro-hydantoin compounds are useful in the treatment of immune or inflammatory diseases. Also, provided are products made by the instant inventive process and crystalline forms (prepared by any process) of the substituted spiro-hydantoin compound, 5-[(5S, 9R)-9-(4-Cyanophenyl)-3-(3,5-dichlorophenyl)-1-methyl-2,4-dioxo-1,3,7-triazaspiro[4.4]non-7-ylmethyl]-thiophene-3-carboxylic acid, including solvates and salts thereof, as well as methods of use thereof. Crystalline forms of certain intermediates are provided.

The invention discloses a preparation method and application of a water-soluble carbon fiber sizing agent. The water-soluble carbon fiber sizing agent contains 3-30 parts of water-soluble polymer, 0.04-1 part of adhesive, 0.1-2 parts of emulsifier and 60-97 parts of solvent, wherein the water-soluble polymer refers to a molecule containing a great quantity of one or several of hydroxyl, amino, acylamino and carboxylic acid. The preparation method comprises the following steps: at 60-100 DEG C, adding the water-soluble polymer into the solvent to be completely dissolved, and after the temperature is moderate, adding the adhesive and the emulsifier into the solution, and stirring for dissolution to prepare an integrated solution, thus obtaining the water-soluble carbon fiber sizing agent. Materials adopted by the invention are all non-toxic; after the carbon fiber is treated by using the water-soluble carbon fiber sizing agent, the surface of the carbon fiber contains a large quantity of active functional group, so that the surface hydrophilicity and dispersibility of the carbon fiber are greatly improved, good softness and flexibility of the carbon fiber are guaranteed, and the carbon fiber can be better applied to water treatment and other aspects having requirement for good dispersibility of the carbon fiber.

The invention discloses a resin composition and its preparing process, wherein the resin composition comprises alkali metal salt (A) whose content is 0.1-20 umol/g converted into alkali metal, carboxylic acid and its salt whose content is 2 umol/g converted into carboxylic acid radicals, vinyl with 5-60 mol% of content and 80-90 mol% of saponification degree.

The invention relates to a water-reducing polycarboxylic concrete slump retaining agent and a preparation method thereof. The molecular weight of the water-reducing polycarboxylic concrete slump retaining agent ranges from 18000 to 48000, and the structural general formula of the water-reducing polycarboxylic concrete slump retaining agent is expressed by a formula I shown in the specification, wherein m ranges from 1 to 10, n ranges from 5 to 20, p ranges from 4 to 10, q ranges from 1 to 7 and k ranges from 1 to 10. Compared with the existing slump retaining agent, the water-reducing polycarboxylic concrete slump retaining agent has the advantages that a carboxylic acid group is capable of functioning in delaying coagulation and retaining slump, while an alcoholic hydroxyl group is capable of functioning in delaying coagulation, the molecule of itaconic acid introduced in the molecular structure of the water-reducing polycarboxylic concrete slump retaining agent contains two -COOHs, and thus is capable of complexing with Ca2<+> and effectively delaying cement hydration, a sulfonic acid group introduced in the molecular structure of the slump retaining agent is capable of dispersing cement particles at first and delaying cement hydration, and a benzene ring in the molecular structure is easy to generate steric-hinerance effect and enhances the dispersion stability of the water-reducing agent; besides, the water-reducing polycarboxylic concrete slump retaining agent is obvious in slump retaining effect, and is low affected by weather; when being matched with other additives for use, the water-reducing polycarboxylic concrete slump retaining agent is good in compatibility with other additives; the slump retaining agent is capable of obtaining efficient slump retaining effect by a dosage within a low range.

The invention belongs to the field of analytical chemistry and particularly relates to a detecting method for determining various neurotransmitters on the basis of in situ derivation. The method is characterized in that 4'-carbonyl chloride-rhodamine is used as the derivative reagent for the first time, the ultrasonic assistance-in situ derivation-dispersive liquid-liquid microextraction technology is used to derive amino acid and monoamine neurotransmitters, and the ultra-high performance liquid chromatography triple quadrupoles tandem mass spectrum with multiple reaction monitoring modes is used to perform qualitative and quantitative detection; three internal standard substances (isoprenaline, 5-ketoindole-2-carboxylic acid and norleucine) are used for building the linear equations of the neurotransmitters of three chemical structures; the existence of the neurotransmitters is accurately determined by quantification through an internal standard method. The detecting method is simple, fast, high in sensitivity, good in selectivity, good in recovery rate, capable of fast and accurately determining the neurotransmitters, and the like.

Process for treating spent nuclear fuel (SNF) to make mixed metal oxides of UO₃ and PuO₂ to prevent nuclear proliferation. The process comprises the steps of (1) dissolving spent nuclear fuel in an acidic solution in the presence of an agent that reduces Pu⁺⁶ to Pu⁺⁴ and an agent that oxidizes Pu⁺³ to Pu⁺⁴; (2) extracting U⁺⁶ and Pu⁺⁴ from acidic solution with an organic solvent comprising a ligand that binds U⁺⁶ and Pu⁺⁴ and which is soluble in the organic solvent; (3) jointly extracting U⁺⁶ and Pu⁺⁴ from the organic solvent with an acidic aqueous solution; and (4) precipitating a mixture of U⁺⁶ and Pu⁺⁴ by adding a carboxylic acid to the acidic aqueous solution. The U⁺⁶ and Pu⁺⁴ precipitate is then be calcined to form a mixed metal oxide of UO₃ and PuO₂. Additional steps can result in the formation of a mixed metal oxide of UO₃, PuO₂ and NpO₂ as well as the removal and isolation of technecium from the SNF.

An aqueous precipitation process for the preparation of particles comprising primarily silver sulfate, comprising reacting an aqueous soluble silver salt and an aqueous soluble source of inorganic sulfate ion in an agitated precipitation reactor vessel and precipitating particles comprising primarily silver sulfate, wherein the reaction and precipitation are performed in the presence of an aqueous soluble carboxylic acid additive or salt thereof, the amount of additive being a minor molar percentage, relative to the molar amount of silver sulfate precipitated, and effective to result in precipitation of particles comprising primarily silver sulfate having a mean grain-size of less than 70 micrometers.

The invention is directed to oil soluble additive compositions, lubricating oil compositions, and additive concentrates comprising the salt of (1) a molybdenum oxide, sulfide, or oxysulfide and (2) an amide reaction product of a carboxylic acid component and a polyamine component wherein the charge mole ratio (CMR) of the carboxylic acid component to the polyamine component is about 2:1 to 1:1.

The invention relates to a preparation method for an intelligent temperature-variable and immersion-proof shell fabric and a product thereof. The preparation method comprises the following steps: 1. temperature-variable copolymer of N-tert-butyl-acrylamide and acrylamide is obtained through the composition with a to b as the mole ratio of incoming stocks; wherein, the a lies between 60 and 40, and the b lies between 40 and 60; 2. a coating layer liquid is prepared according to the following concentration formulation by mass: 8 to 15 percent of the copolymer, 2.0 to 5.0 percent of a crosslinking agent that is 1,2,3,4-butane tetrabasic carboxylic acid and 0.5 to 2.5 percent of a catalyst that is sodium hypophosphite; 3.the coating layer liquid is used for coating a preprocessed fabric; 4. the immersion-proof shell fabric can be obtained through post processing. The product is produced by adopting the preparation method of the intelligent temperature-variable and immersion-proof fabric of the invention.

A transparent polyimide film, prepared from a copolymerized polyamide acid according to a chemical cyclization method, is provided. The copolymerized polyamide acid requires at least a semi-aromatic polyamide acid, and the semi-aromatic polyamide acid is formed by reacting cyclobutane-1,2,3,4-tetracarboxylic dianhydride (CBDA) and 2,2′-bis(trifluoromethyl)diaminodiphenyl (TFMB). The molar number of dianhydrides of the semi-aromatic polyamide acid is more than 20% of the total molar number of anhydrides of the copolymerized polyamide acid, so that the transparent polyimide film has a light transmittance greater than 80%, a chroma b* less than 5, and a CTE less than 35 ppm/° C.

The invention discloses a room-temperature preparation method of a metal-organic framework material preferentially adsorbing ethane. The preparation method comprises the following steps: dispersing zinc oxide and copper tetrafluoroborate hexahydrate in water and ethanol; dispersing quinoline-5-carboxylic acid in N,N-dimethylformamide; mixing the former solutions, and stirring an obtained mixed solution at room temperature; filtering the stirred solution to obtain a solid product, purifying, drying and performing vacuum activation to obtain the metal-organic framework material preferentially adsorbing the ethane. By the room-temperature preparation method, the metal-organic framework material with good alkane selectivity is prepared at room temperature, the synthesizing energy consumption of the material is reduced, and the prepared material has good adsorptive separation performance for ethylene-ethane gas at normal temperature and pressure. The material can preferentially adsorb the ethane from the ethylene-ethane mixed gas; in addition, the material has good water vapor stability, and still has a good crystal structure after 40-day direct exposure to air.

The invention relates to a method for dyeing a polyester fiber type material by using an oligomer removing agent. The method comprises the following step: adding the oligomer removing agent and a dyeing assistant into a dyeing bath together to dye the polyester fiber type material, wherein the formula of the oligomer removing agent comprises the following raw materials: 10-20 parts of dicarboxylic acid di(C1-C4) alkyl ester, 14-26 parts of aromatic di(C1-C4) carboxylic acid, 30-50 parts of aliphatic diol or aliphatic polyol, 10-20 parts of difunctional sulfonated monomer, 10-30 parts of polyether and 15-100 parts of polyoxyethylene sorbitan fatty acid ester. According to the method provided by the invention, by adding polyoxyethylene sorbitan fatty acid ester, good synergy is realized, the dispersion performance of a dyeing solution is enhanced, the adsorption of a condensed matter in the dyeing solution to the surface of fiber can be better inhibited, and the problems caused by a polyester oligomer in a dyeing process are further solved. Thus, the dyeing of fabric is uniform, the color fastness is improved, and the stability of a product is enhanced.

Provided herein are asphalt compositions comprising asphalt, a carboxylated copolymer, a polyalkyleneimine, and a photoinitiator. The carboxylated copolymer present in the asphalt compositions can be a latex composition derived from a carboxylated styrene-butadiene copolymer. The carboxylated copolymer includes from 0.5% to 25% by weight carboxylic acid monomers. The carboxylated styrene-butadiene polymer and the asphalt can be present in a weight ratio of from 1:99 to 1:10. The polyalkyleneimine present in the asphalt compositions can be in an amount of greater than 0% to up to 10% by weight of the asphalt composition. The photoinitiator can include benzophenone and/or a derivative thereof. Tack coats meeting ASTM-D-977 standard comprising the asphalt compositions disclosed herein are also provided. The tack coat can have a tack-free time of 10 minutes or less. Methods of producing the asphalt compositions and tack coats are also disclosed.

A copolyester composition comprising units of residues of a) about 1–40 mole % of trans 3,3′, trans 4,4′ stilbene dicarboxylic acid and the combination thereof, b) about 99˜60 mole % of cis,trans, and the combination thereof of 1,4 cyclohexane dicarboxylic acid, and c) about 50˜100 mole % of cis, trans, and the combination thereof of 1,4-cyclohexane dimethanol. The resulting copolyester may be characterized by its clarity, as well as enhanced heat performance due to the presence of the stilbene moiety.

The invention provides a cultivation method for summer corn on the basis of total returning of crushed straw to a field in a lime concretion black soil zone. The cultivation method comprises the following steps: (1) selecting a wheat-corn rotation cropping area in the lime concretion black soil zone, crushing wheat straw during harvesting of wheat, wherein the length of the crushed wheat straw isless than 10 cm, carrying out uniform throwing and spreading, and allowing the crushed wheat straw to cover and return to the field; (2) directly sowing the summer corn without tillage in proper time,treating corn seeds with a phenazine-1-carboxylic acid and folpet seed-coating suspension with a concentration of 24%, simultaneously sowing the corn seeds and applying a base fertilizer, and after sowing is completed, irrigating sowing water with an amount of 600 m<3>/ha; (3) topdressing a nitrogen fertilizer in a flare opening stage of corn; and (4) timely harvesting the corn, crushing corn straw at the same time, wherein the length of the crushed corn straw is less than 10 cm, carrying out uniform throwing and spreading, allowing the crushed corn straw to return to the field, then rotatably tilling soil so as to bury the crushed corn straw into a soil layer with a thickness of 0 to 15 cm, timely applying a fertilizer, and sowing wheat; wherein the base fertilizer is a NPK fertilizer; the fertilizer for topdressing is an N fertilizer; pure N with an amount of 300.0 kg/ha is jointly applied in a corn season; and the weight ratio of the base fertilizer to the fertilizer for topdressing is 3: 7.

The invention discloses a preparation method of indole-3-carboxylic acid. The preparation method is implemented by the following steps: (1) adding a catalyst into an organic solvent prepared from indole; (2) adding solid phosgene into an indole solution containing the catalyst, so as to generate acylation reaction; (3) carrying out basic hydrolysis on a product generated in the step (2) by virtueof an alkaline solution; (4) carrying out acidization on a product generated in the step (3) by virtue of inorganic acid; and (5) carrying out recrystallization on a product generated in the step (4),so as to obtain indole-3-carboxylic acid. The preparation method is simple and convenient in operation and high in product purity and yield and can meet chemical and medicine production requirements.

The invention relates to the technical field of medical materials, and particularly discloses a photoresponse silicon dioxide material and a preparation method and application thereof.The photoresponse silicon dioxide material contains dendritic mesoporous silicon dioxide, and the surface of the dendritic mesoporous silicon dioxide is modified with a fluorinated silane coupling agent and grafted with carboxylated spiropyrane. The photoresponse silicon dioxide material has the characteristics of high biocompatibility, good stability, high drug loading capacity, high encapsulation efficiency, low toxic and side effects and the like, and can be used for delivering macromolecular drugs. The photoresponsive silicon dioxide material is converted between hydrophilicity and hydrophobicity under light control, so that the photoresponsive silicon dioxide material has a photoresponsive drug controlled release effect and is suitable for skin drug delivery.

The invention discloses a polynitrogen heterocyclic super molecule sensitizer and an application thereof, wherein the sensitizer uses a polynitrogen heterocyclic derivative as an electron donor of thesensitizer, the polynitrogen heterocyclic super molecule sensitizer is formed by an intermolecular hydrogen bond between-N= group and a carboxylic acid small molecule, the structural formula is as shown in the specification, wherein ''suspension points'' represent the intermolecular hydrogen bond. The polynitrogen heterocyclic super molecule sensitizer has simple molecular assembly and strong stereostructure, and can be used for preparing a solar cell with high photoelectric conversion efficiency.