25 results about "Acid anhydride formation" patented technology

The invention relates to the technical field of oilfield chemistry, and provides a temperature-resistant and salt-resistant copolymer with filtration loss reduction, viscosity increasing and lubricating properties, and a preparation method and application thereof. The preparation method of the copolymer comprises the step of enabling raw material components including a natural polymer material, organic acid anhydride, sulfonate containing vinyl, an anionic monomer, a crosslinking monomer and an initiator to react in a solvent to prepare the temperature-resistant and salt-resistant copolymer with filtrate loss reduction, viscosity increasing and lubricating properties. The copolymer provided by the invention has excellent temperature resistance and salt resistance, and has good filtration loss reduction, viscosity increasing and lubricating properties. When the copolymer provided by the invention is used in a conventional drilling fluid system capable of resisting the temperature of 180 DEG C, the dosage of drilling fluid treating agents such as a filtrate reducer, a tackifier and a lubricant can be obviously reduced on the premise of keeping equivalent performance, and the formula of the high-temperature-resistant drilling fluid system is greatly simplified.

The invention discloses a high-Tg low-expansion-coefficient underfill adhesive and a preparation method thereof. The high-Tg low-expansion-coefficient underfill adhesive comprises the following raw material components in percentage by weight: 10-15% of alicyclic epoxy resin; 15-18% of organic acid anhydride; 0.5%-1.0% of a curing accelerator; 0.1%-0.3% of a defoaming agent; 1-3% of a silane coupling agent; 1.5%-1.8% of carbon powder; and 60-75% of spherical silicon dioxide. By adopting various raw materials with specific proportions and types, the obtained filling adhesive can be quickly cured at low temperature, and element damage caused by high temperature in the packaging process of a heat-sensitive element becomes possible.

According to the present invention, there is provided a method for the production of an adhesive, said method comprising the following steps: a) providing lignin rich carbohydrate complexes (LCC) by pressurized hot water extraction of softwood biomass, preferably biomass of Norway spruce or Scots pine, or of hardwood biomass, preferably biomass of Birch or Beech, providing bark lignin rich carbohydrate complexes (BLCC) by pressurized hot water extraction of softwood bark, preferably bark of Norway spruce or Scots pine, or providing liquefied biomass by acid-catalyzed liquefaction of biomass including wood saw dust, agricultural residues, plant stalks, recycle carton boards, recycle paper, recycle wood, wood panels, and wood bark side streams, in polyhydric alcohols and phenols; b) reacting the LCCs, BLCCs, or liquefied biomass obtained in step a) with a crosslinking or catalytic agent selected from the group consisting of: carboxylic agents including citric acid, dicarboxylic acids including adipic acid, organic acid anhydrides, tannin, tannic acid, plant derived fatty acids including suberin, and hexamethylenediamine, in order to produce said adhesive. The present invention is also directed to an adhesive produced by the method of the invention and to the use thereof as a bonding agent in wood products or as a coating agent in wood products or mineral wool.

The present application relates to the field of adhesive additives, and in particular to a molecular sieve activation powder for extending the curing time of an adhesive and a preparation method thereof. The molecular sieve activation powder for extending the curing time of an adhesive comprises raw materials including: 60 to 90 parts of base sieve powder, 10 to 25 parts of modified additives, 5 to 20 parts of organic acid anhydride, and 5 to 10 parts of polysiloxane. The molecular sieve activation powder prepared in the present application can retain a good adhesive curing extension effect while ensuring excellent moisture and gas adsorption performance, providing more open time for the use of adhesives, especially being able to effectively delay the curing speed of polyurethane adhesives, that is, extending the curing time required for polyurethane adhesives, making the adhesive operable for a longer time, facilitating the application of adhesives, and having very excellent market and application value.

The invention discloses a synthesis method of 4-bromo-3-(ethoxymethyl) benzoic acid, which comprises the following steps: (1) activating carboxyl of p-bromobenzoic acid serving as a raw material in the presence of an organic anhydride activator, and then performing chloromethylation reaction with paraformaldehyde in the presence of a chlorine-containing Lewis acid catalyst to obtain 4-bromo-3-(ethoxymethyl) benzoic acid; after the reaction is completed, carrying out post-treatment to obtain an intermediate 4-bromo-3-(chloromethyl) benzoic acid; and (2) carrying out nucleophilic substitution reaction on the intermediate obtained in the step (1) in ethanol under the action of inorganic alkali to prepare the target product 4-bromo-3-(ethoxymethyl) benzoic acid. According to the invention, through one-pot activation and chloromethylation of p-bromobenzoic acid, concise, efficient and highly economical synthesis from cheap raw materials to the sparsentan key intermediate is realized.

The invention discloses a catalyst component for olefin polymerization, a catalyst, a preparation method and application, and relates to the technical field of olefin polymerization catalysts. The catalyst component comprises reaction products of the following components: a magnesium-containing compound solution, an organic anhydride compound, a titanium compound, an acetate compound, a first alcohol compound and an aromatic ester compound, in the catalyst component, the molar ratio of the magnesium element to the organic anhydride compound to the titanium compound to the acetate compound to the first alcohol compound to the aromatic ester compound is 1: (0.01-1): (2-30): (0.01-10.0): (0.05-10.0): (0.01-5.0). The catalyst component prepared by the preparation method provided by the invention is concentrated in particle size distribution, the catalyst containing the catalyst component has higher polymerization activity, the hydrogen regulation sensitivity under the condition of high hydrogen-ethyl ratio is greatly improved, the hydrogen regulation sensitivity under the condition of low hydrogen-ethyl ratio is moderate, and the catalyst component is suitable for industrial production. The catalyst can catalyze ethylene polymerization to obtain powder particles with high bulk density, the content of fine powder with the size smaller than 75 microns in the polymerized powder is greatly reduced, and almost no fine powder exists.

The application belongs to the technical field of organic silicon and relates to a preparation method of low-viscosity hydroxyl-terminated phenyl silicone oil, which comprises the following steps: (S1) adding diphenylsilanediol, organic acid anhydride and an acidic catalyst into an aprotic polar organic solvent to perform acylation reaction to obtain an acylated product; (S2) adding the acylated product dropwise into an alkaline aqueous solution under stirring until the system is neutral, then performing hydrolysis and polycondensation, separating the upper oil phase after the reaction is completed, and obtaining a phenyl-containing prepolymer; and (S3) mixing the phenyl-containing prepolymer, cyclosiloxane and an alkali metal catalyst, then performing ring-opening copolymerization reaction in an inert atmosphere, and obtaining the low-viscosity hydroxyl-terminated phenyl silicone oil after purification. The viscosity of the hydroxyl-terminated phenyl silicone oil prepared by the application is low, the viscosity at 25 DEG C is 200-1000 mPa.s, the phenyl content is adjustable, there is no methoxy group, the preparation cost is low, and the preparation process is environmentally friendly.

The present application relates to a kind of moisture-proof phenolic resin, grinding wheel and its preparation method, the moisture-proof phenolic resin is made of raw material comprising the following components: phenol 1000 mass parts;37wt% of formaldehyde 1000-1500 mass parts;Organic amine catalyst 30-100 mass parts;Organic acid anhydride 5-30 mass parts;Melamine 50-150 mass parts;Methyl potassium silicate 50-150 mass parts.The moisture-proof phenolic resin is not easy to absorb moisture in air, not easy to form group, can be used to prepare resin grinding wheel, improve the yield of grinding wheel.

The present invention discloses a method for preparing phosphorus pentafluoride gas, comprising the following steps: (1) reacting a phosphorus-containing compound with hydrogen fluoride and an organic acid anhydride dehydrating agent to generate a hexafluorophosphoric acid solution; and (2) heating the hexafluorophosphoric acid solution to decompose it into gaseous hydrogen fluoride and phosphorus pentafluoride. The method has high water removal efficiency, simple process, and is easy to be continuously produced.

The invention provides a catalyst component for olefin polymerization, which comprises a reaction product of a magnesium compound, an organic anhydride compound, a titanium-containing compound, an acetate compound, an alcohol compound, a long carbon chain monoester compound and an optional aromatic ester compound, the magnesium compound is a compound formed by dissolving magnesium halide in a solvent system containing an organic epoxy compound and an organic phosphorus compound. The method can be used for preparing spherical or sphere-like solid particles (solid catalyst components) containing magnesium and titanium. The polymerization activity and hydrogen regulation sensitivity of the catalyst particles are high, polyethylene powder with high stacking density can be obtained through polymerization, and the requirement of an industrial production device for the catalyst is met.

The invention provides a catalyst component for olefin polymerization, a preparation method of the catalyst component, a catalyst and application of the catalyst component. The catalyst component comprises a magnesium compound, an organic anhydride compound, an acetate compound, an alcohol compound, a titanium-containing compound and a reaction product of an internal electron donor. The magnesium compound is a compound formed by dissolving magnesium halide in a solvent system containing an organic epoxy compound and an organic phosphorus compound. The catalyst particles are high in polymerization activity and narrow in particle size distribution, polyethylene powder which is high in stacking density, good in particle morphology, high in molecular weight and narrow in molecular weight distribution can be obtained through polymerization, and the requirement of an industrial production device for the catalyst is met.

The present application relates to the technical field of oil field chemistry, and provides a temperature-resistant and salt-resistant copolymer with filtration-reducing, viscosity-increasing and lubricating properties, and a preparation method and application thereof.The preparation method of the copolymer comprises: reacting raw material components including natural high molecular material, organic acid anhydride, vinyl-containing sulfonate, anionic monomer, crosslinking monomer and initiator in a solvent to obtain the temperature-resistant and salt-resistant copolymer with filtration-reducing, viscosity-increasing and lubricating properties.The copolymer provided by the present application has excellent temperature resistance and salt resistance, and has good filtration-reducing, viscosity-increasing and lubricating properties.The copolymer provided by the present application is used in a conventional drilling fluid system resistant to 180 DEG C, and under the premise of keeping the performance, the amount of drilling fluid treatment agents such as filtration reducer, viscosity increasing agent and lubricant can be obviously reduced, and the formula of the high-temperature-resistant drilling fluid system is greatly simplified.

An aspect of the present disclosure is a method that includes a first reacting a molecule from at least one of a carboxylic acid, an ester of a carboxylic acid, and / or an anhydride with ammonia to form a nitrile, where the first reacting is catalyzed using an acid catalyst. In some embodiments of the present disclosure, the molecule may include at least one of acetic acid, lactic acid, and / or 3-hydroxyproprionic acid (3-HPA). In some embodiments of the present disclosure, the molecule may include at least one of methyl acetate, ethyl lactate, and / or ethyl 3-hydroxypropanoate (ethyl 3-HP). In some embodiments of the present disclosure, the anhydride may be acetic anhydride.

The invention relates to modified amino silicone oil as well as a preparation method and application thereof, the preparation method comprises the following steps: S100, mixing 100 parts by weight of hydroxyl-terminated polydimethylsiloxane, 2-30 parts by weight of amino silane and 3-30 parts by weight of dimethyl silicone oil at the temperature of 40-100 DEG C to obtain a mixture; s200, at the temperature of 20-40 DEG C and under the stirring condition, 6-40 parts by weight of water is added into the mixture for a hydrolysis reaction, then nitrogen is introduced into a reaction system to discharge water and generated alcohol, and a hydrolysate is obtained; s300, adding 0.0001-0.005 part by weight of phosphazene base into the hydrolysate, and carrying out a first reaction at the temperature of 50-100 DEG C under the condition that nitrogen is introduced into a reaction system; adding 1-10 parts by weight of organic acid anhydride, and carrying out second reaction at the temperature of 50-100 DEG C to obtain a reaction product; and S400, carrying out low-temperature removal treatment on the reaction product to obtain the modified amino silicon oil. The modified amino silicon oil provided by the invention has the advantages of low content of organic silicon ring bodies, low volatile components and low yellowing property.

The invention belongs to the technical field of organic silicon, and relates to a preparation method of low-viscosity hydroxyl-terminated phenyl silicone oil, which comprises the following steps: (S1) adding diphenyl silanediol, organic anhydride and an acid catalyst into an aprotic polar organic solvent for acylation reaction to obtain an acylated product; (S2) dropwise adding the acylation product into an alkaline aqueous solution in a stirring state until the system is neutral, then carrying out hydrolytic polycondensation, and separating out an upper oil phase after the reaction is ended, so as to obtain a phenyl-containing prepolymer; and (S3) mixing the phenyl-containing prepolymer, cyclosiloxane and an alkali metal catalyst, carrying out a ring-opening copolymerization reaction in an inert atmosphere, and purifying after the reaction is finished to obtain the low-viscosity hydroxyl-terminated phenyl silicone oil. The prepared hydroxyl-terminated phenyl silicone oil is low in viscosity, the viscosity is 200-1000 mPa.s at the temperature of 25 DEG C, the phenyl content is adjustable, no methoxy group exists, meanwhile, the preparation cost is low, and the preparation process is environmentally friendly.

An aqueous polymeric dispersion of a copolymer including monomers a), b), c), and d). Monomer a) has Structure (I): where R1 is hydrogen or a methyl group; and R2 is a C1-C8 non-cyclic alkyl group. Monomer b) is an ethylenically unsaturated monomer other than a) selected from C1-C8 alkyl (meth)acrylates, ethylene, vinyl acetate, vinyl versatate, styrene, styrene derivatives, or combinations thereof. Monomer c) is an ethylenically unsaturated monomer including a functional group selected from carboxylate, phosphate, phosphonate; sulfonate, and / or acid, and / or salt, and / or anhydride forms thereof; hydroxyl; silane; or combinations thereof. Monomer d) is a nitrogen-bearing ethylenically unsaturated monomer. The copolymer includes at least 5%, biocarbon content as determined by ASTM D6866-22. The aqueous dispersion has a minimum film formation temperature less than 30°C.

The invention provides a catalyst for waste mineral oil regeneration and a preparation method and application thereof, and belongs to the field of catalysts. The method comprises the following steps: mixing a molybdenum source, isocaprylic acid, cobalt iso-octoate, organic acid anhydride, a sulfur-containing compound and cetyltrimethylammonium bromide, and then carrying out preliminary complexation reaction at 50-110 DEG C for 0.5-2 hours to obtain a first reaction system; raising the temperature of the first reaction system to 110-160 DEG C, then adding aminopropyltriethoxysilane into the first reaction system, and reacting for 1-3 hours at the temperature of 110-160 DEG C to obtain a second reaction system; and continuously raising the temperature of the second reaction system to 160-230 DEG C, and carrying out vulcanization reaction at 160-230 DEG C for 2-4 hours. Through the molecular and nano structure design of the catalyst, the core contradiction that a reaction system is easy to coke and colloidal asphaltene is difficult to convert is synchronously and efficiently solved in the process of regenerating waste mineral oil through slurry reactor hydrogenation.

An aqueous polymeric dispersion of a copolymer including monomers a), b), c), and d). Monomer a) has Structure (I): where R1 is hydrogen or a methyl group; and R2 is a C1-C8 non-cyclic alkyl group. Monomer b) is an ethylenically unsaturated monomer other than a) selected from C1-C8 alkyl (meth)acrylates, ethylene, vinyl acetate, vinyl versatate, styrene, styrene derivatives, or combinations thereof. Monomer c) is an ethylenically unsaturated monomer including a functional group selected from carboxylate, phosphate, phosphonate; sulfonate, and / or acid, and / or salt, and / or anhydride forms thereof; hydroxyl; silane; or combinations thereof. Monomer d) is a nitrogen-bearing ethylenically unsaturated monomer. The copolymer includes at least 5%, biocarbon content as determined by ASTM D6866-22. The aqueous dispersion has a minimum film formation temperature less than 30°C.

The jelly ice crystal is prepared from the following components in percentage by mass: 10 to 20 percent of macromolecular resin, 3 to 8 percent of organic acid anhydride, 0.5 to 3 percent of modified pearl powder, 0.5 to 2 percent of tert-butylhydroquinone and the balance of solvent, wherein the modified pearl powder is obtained through reaction of acrylic anhydride grafted gelatin and silane coupling agent grafted pearl powder. The preparation method comprises the following steps: firstly, modifying gelatin by adopting acrylic anhydride, introducing unsaturated double bonds, and then mixing and reacting with acrylate silane coupling agent grafted pearl powder, so that active groups such as amino groups and carboxyl groups are introduced on the surface of the pearl powder, the compatibility between the modified pearl powder and macromolecular resin is enhanced, and the stability of a product is improved; and the organic acid anhydride is adopted to modify the polymer resin, and the polymer resin can be further crosslinked with the modified pearl powder through chemical bonding, intermolecular force and other modes to form a more stable structure, so that the mechanical properties of the jelly ice crystal are improved.

The present invention relates to a polyalkylene carbonate-based resin having excellent thermal stability and a method for preparing same, and provides a polyalkylene carbonate-based resin and a method for preparing same, the resin comprising: a repeating unit represented by chemical formula 1; a repeating unit represented by chemical formula 2; and an organic acid anhydride-derived unit, wherein a peak is present in the region of 6.3 ppm to 6.7 ppm in the 1H NMR spectrum.

The present invention relates to a polyalkylene carbonate-based resin having excellent thermal stability and a method for preparing the same, and provides a polyalkylene carbonate-based resin and a method for preparing the same, the polyalkylene carbonate-based resin comprising: a repeating unit represented by chemical formula 1; a repeating unit represented by Chemical Formula 2; and a unit derived from an organic acid anhydride, in which the polyalkylene carbonate-based resin has a peak in the region of 6.3 ppm to 6.7 ppm in the 1H NMR spectrum.

The invention relates to a catalyst component for olefin polymerization, a preparation method of the catalyst component, a catalyst and application of the catalyst component. The catalyst component comprises a reaction product of a magnesium compound, an organic anhydride compound, an acetate compound, a first alcohol compound, a titanium-containing compound and an organosilicon compound, the general formula of the organic silicon compound is R1aR2b (OR3) cSi-M-Si (OR3 ') dR1'eR2'f. According to the invention, the performance of the existing Ziegler-Natta type olefin polymerization catalyst particles is improved, and the prepared catalyst component is spherical / sphere-like, has better polymerization activity, hydrogen regulation sensitivity, stacking density, particle size distribution and fluidity, and has extremely high popularization and application values.

The disclosed subject matter relates to nitrogen stabilizing compositions containing a nitrogen stabilizer condensed with an organic anhydride. The resulting condensation product exhibits a number of beneficial properties, such as increased thermal stability and the ability to provide controlled and continuous release of the nitrogen stabilizer, thereby promoting increased nutrient availability to plants and crops.

The application belongs to the technical field of catalysts, and discloses a catalyst component for ethylene polymerization, a preparation method, a catalyst and application, the catalyst component comprises the reaction products of the following components: 1) a spherical or spherical-like solid catalyst component B; 2) an alcohol compound; 3) a second organic epoxy compound; 4) a second titanium compound; 5) an electron donor selected from an electron donor a and / or an electron donor b; the spherical or spherical-like solid catalyst component B comprises the reaction products of a magnesium complex, an organic acid anhydride compound, an acetate compound and a first titanium compound. The catalyst has high polymerization activity for ethylene polymerization, and the prepared polyethylene powder has high molecular weight and low ash content.

Provided is a method for preparing a sucrose-6-ester, including: preparing a reaction solution of sucrose and an organo-tin compound; atomizing the reaction solution to form droplets; thoroughly mixing and contacting the droplets with a gasified dehydration medium such that the droplets undergo a dehydration reaction to obtain an intermediate mixture containing sucrose organic tin ester droplets; separating the intermediate mixture to obtain a sucrose organic tin ester solution and a dehydrated gas-liquid mixture; recovering the sucrose organic tin ester solution obtained in the separation step and cycling to the atomization and dehydration steps several times; and subjecting an organic acid anhydride to an acylation reaction with the sucrose organic tin ester solution to obtain the sucrose-6-ester.