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46 results about "Methylsuccinic acid" patented technology
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Ambient temperature rapid self-polymerization compositions of high cross-linked or linear type beta-amino-ester alternative co-polymers and their applications
InactiveUS20070299211A1Self-polymerization can be very rapidSelf-polymerization rate can be controlledCross-linkAmino esters
Self-polymerization of mono-aziridine (or azetidine) and multi-aziridine (or azetidine) containing compounds with vinyl group containing organic acid, such as acrylic acid (AA), 2-methylenesuccinic acid, 2,3-dimethylenesuccinic acid and etc, at ambient temperature results in the new type of cross-linked and linear type copolymers, respectively.The polymerization of multi-functional aziridine (or azetidine) containing compounds with vinyl group containing organic acid results in the formation of high cross-linked polymers. The self-polymerization takes place at ambient temperature and the resultants, cross-linked polymeric networked materials, are solvent insoluble and potential for adhesive, composite matrix and other applications. These insoluble materials are hydrolyzed in an acidic or basic condition to form the water soluble β-amino acids.A linear poly(β-aminoester) is obtained from the self-polymerization of vinyl group containing organic acid with mono-aziridine (or azetidine) containing compound at ambient temperature. poly(β-aminoester) is applicable for gene transfer, controlled drug release and other applications. This self-polymerization process offers a convenient route for preparing poly(β-aminoesters).
Owner:TAMKANG UNIVERSITY
Sulfomethylsuccinates, process for making same and compositions containing same
Sulfomethylsuccinates of the formula:wherein R is an alkyl, alkenyl, alkynyl, alkoxylated alkyl, cycloalkyl, cycloalkenyl, cycloalkynyl, branched alkyl, branched alkenyl, branched alkynyl, branched alkoxylated alkyl, aromatic, substituted alkyl aromatic, substituted alkenyl aromatic or substituted alkoxylated aromatic group; M is a cation, hydrogen, amine or ammonium salt or combinations thereof, and each M may be the same as or different from the other; and n is from 1 to about 6. Processes for synthesizing the sulfomethylsuccinates are also provided. The sulfomethylsuccinates can be used as surfactants, emulsifiers, skin feel agents, film formers, rheological modifiers, solvents, release agents, lubrication agents, conditioners, and dispersants, etc.
Owner:STEPAN COMPANY
Methods of manufacturing bioactive 3-esters of betulinic aldehyde and betulinic acid
InactiveUS20090023698A1High yieldOrganic active ingredientsSteroidsMedicinal chemistryMethylsuccinic acid
Owner:KRASUTSKY PAVEL A +1
Soldering flux for improving film-forming property
InactiveCN103801860AImprove performanceHalogen freeWelding/cutting media/materialsSoldering mediaTriclosanGlutaric acid
The invention discloses soldering flux for improving the film-forming property. The soldering flux is prepared from 10-20 parts of activating agent, 2-6 parts of surface active agent, 0.3-0.8 part of cosolvent, 0.2-2 parts of film-forming agent, 0.04-0.09 part of corrosion inhibitor, 1-4 parts of antioxidant and the balance of deionized water, wherein the film-forming agent is prepared from at least one of PEG-1000, PEG-2000, PEG-4000 and PEG-6000, the surface active agent is prepared from at least one of FMEE and lutensol to (3,5,7,9) compounds, BTA and BIA are mixed to form the corrosion inhibitor, the antioxidant is prepared from at least one of tertiary butylhydroquinone, triclosan, tetrachloroisophthalonitrile and allicin, and the activating agent is prepared from at least two of glutaric acid, DL-malic acid, methylsuccinic acid and itaconic acid. With the method, the soldering flux for improving the film-forming property has the advantages of being free of halogen, low in residue, free of washing, environmentally friendly and the like.
Owner:SUZHOU LOTTE CHEM TECH
Charge-reversed DNA (Deoxyribose Nucleic Acid) nano-carrier and preparation method and application thereof
InactiveCN106512024AHigh affinityEffective internalizationGenetic material ingredientsPharmaceutical non-active ingredientsAntibody expression3-deoxyribose
The invention discloses a charge-reversed DNA (Deoxyribose Nucleic Acid) nano-carrier and a preparation method and application thereof, and belongs to the fields of gene treatment and DNA vaccine antibody expression. The charge-reversed DNA nano-carrier comprises a compound prepared from methylsuccinic acid-3-dimethylamino-1-propyl ester quaternary ammonium salt and pDNA, has different quantities of electric charges under different pH conditions, and can be subjected to charge reversing under a corresponding PH condition. The prepared charge-reversed compound has a pH response, has different quantities of electric charges under different pH conditions through the methylsuccinic acid-3-dimethylamino-1-propyl ester quaternary ammonium salt, and is subjected to charge reversing under a certain PH condition, and a nano-compound carries positive charges when the compound passes through the surface of a cell membrane carrying negative charges, so that the compatibility with the cell membrane is very high, the compound can be effectively internalized, the electric charges are reversed under different pH conditions in cells, and a carrier carrying the negative charges can circulate for a long time more easily and is more suitable to be applied in gene treatment and antibody production.
Owner:HUBEI UNIV OF TECH
Biological organic fertilizer
InactiveCN104387189AMeet the needs of growth and developmentImprove fertilizer efficiencyExcrement fertilisersBioloigcal waste fertilisersDiseaseSodium Bentonite
The invention relates to a biological organic fertilizer consisting of the following raw materials in parts by weight: 1-100 parts of fowl manure, 1-10 parts of boric acid, 1-100 parts of rice hull powder, 1-20 parts of a ferment, 1-10 parts of epsilon-polylysine, 1-100 parts of sorghum straws, 1-50 parts of calcium hydrogen phosphate, 1-10 parts of humic acid, 5-20 parts of urea, 1-5 parts of zinc sulfate, 5-20 parts of ammonium sulfate, 5-20 parts of potassium chloride, 1-25 parts of bentonite, 1-30 parts of potassium sulfate and 1-10 parts of methylsuccinic acid. The bio-enzyme fertilizer namely the biological organic fertilizer, after being applied to soil, can increase the yield, improve soil, improve the fertilizer effect, and ensure that plants are healthy and strong and have developed root systems to prevent diseases and inhibit bacteria; and the fertilizer is stress-resistant, can remove pesticide hazards, is rich in boron and potassium, can meet requirements of crop growth and development and can enhance economic benefits.
Owner:广西源晨农副产品股份有限公司
Lithium-manganese primary battery
InactiveCN109301274AImprove discharge characteristicsImprove working environment temperatureOrganic electrolyte cellsGlutaric anhydrideHigh temperature storage
For solving the problems that a lithium-manganese primary battery in the prior art generates gas and influences the discharge characteristic under a high temperature environment, the invention provides a lithium-manganese primary battery, which includes a cathode, an anode and an electrolyte. The cathode includes MnO2. The electrolyte includes an additive. The additive includes an acid anhydride compound being one or more of: maleic anhydride, methyl maleic anhydride, dimethyl maleic anhydride, succinic anhydride, glutaric anhydride, methyl succinic anhydride, dimethyl succinic anhydride, acetic anhydride, propionic anhydride and butyric anhydride. By means of the specific acid anhydride compound, the high-temperature storage performance of the lithium-manganese primary battery is effectively improved.
Owner:SHENZHEN CAPCHEM TECH CO LTD
Method for hydrogenating itaconic acid
InactiveCN101781169ADoes not detract from valueExtended service lifeOrganic compound preparationCarboxylic acid esters preparationAlcoholItaconic acid
The invention discloses a method for hydrogenating itaconic acid. The method comprises the following steps of: performing esterification reaction on the itaconic acid and alcohols to obtain dialkyl itaconate; and hydrogenating the dialkyl itaconate with catalysts to obtain 2-methyl-1,4-butanediol, 2-methylbutyrolactone, 3-methylbutyrolactone and 2-methylsuccinate. According to the method, a two-stage method of esterifying first and then hydrogenate itaconic acid instead of hydrogenating itaconic acid directly is adopted, so the service life of the catalysts is effectively prolonged and the great water consumption in the prior art is solved.
Owner:IND TECH RES INST
Process for preparing L- (+) -lactic acid
InactiveUS7820859B2High purityPrevent oxidationOrganic compound preparationChemical industrySodium bicarbonateMethyl pyruvate
Owner:COUNCIL OF SCI & IND RES
Preparation method of antibacterial fiber and fabric
The invention discloses a preparation method of antibacterial fibers and a fabric, and relates to the technical field of textile fabrics. When the antibacterial fiber is prepared, 1, 6-hexanediol, 2-(bromomethyl) diethyl succinate and diethyl 2, 2 ': 6', 2 '-terpyridine-4'-yl phosphonate are polymerized to prepare polyester; the preparation method comprises the following steps: reacting polyester with 7-(dimethylamino) coumarin to prepare modified polyester; the preparation method comprises the following steps: polymerizing maleic anhydride and methyl-vinyl polysiloxane and coating the surface of a phase change microcapsule with the maleic anhydride and the methyl-vinyl polysiloxane to prepare a pre-modified phase change microcapsule; the pre-modified phase change microcapsule and 1-hydroxymethyl-5, 5-dimethyl hydantoin are subjected to a reaction, and a modified phase change microcapsule is prepared; preparing a spinning solution from the modified polyester, the modified phase change microcapsules and copper chloride, performing electrostatic spinning, and performing chlorination finishing to obtain the antibacterial fiber. The antibacterial fiber prepared by the invention has excellent antibacterial, anti-aging, flame-retardant and mechanical properties.
Owner:HENGYANG FENLE NEW LIFE TECHNOLOGY CO LTD
2,5-di(methoxyanilino) terephthalic acid polymorphs and quinacridones realized therefrom
2,5-di(p-methoxyanilino)terephthalic acid crystal types I and II are made by controlling the pH during the recovery of the oxidized product of the condensation of dimethylsuccinyl succinate with p-methoxyaniline. The resulting 2,5-di(p-methoxyanilino)-terephthalic acid can be converted into 2,9-dimethoxyquinacridone or a solid solution thereof having controlled characteristics.
Owner:SUN CHEM CORP
Sulfomethylsuccinates, process for making same and compositions containing same
Sulfomethylsuccinates of the formula:wherein R is an alkyl, alkenyl, alkynyl, alkoxylated alkyl, cycloalkyl, cycloalkenyl, cycloalkynyl, branched alkyl, branched alkenyl, branched alkynyl, branched alkoxylated alkyl, aromatic, substituted alkyl aromatic, substituted alkenyl aromatic or substituted alkoxylated aromatic group; M is a cation, hydrogen, amine or ammonium salt or combinations thereof, and each M may be the same as or different from the other; and n is from 1 to about 6. Processes for synthesizing the sulfomethylsuccinates are also provided. The sulfomethylsuccinates can be used as surfactants, emulsifiers, skin feel agents, film formers, rheological modifiers, solvents, release agents, lubrication agents, conditioners, and dispersants, etc.
Owner:STEPAN COMPANY
Antibacterial sound-absorbing cotton and preparation method thereof
InactiveCN103707581AHas antibacterial propertiesSimple processSynthetic resin layered productsSound producing devicesPorosityAchyranthes aspera
Disclosed antibacterial sound-absorbing cotton consists of a top layer, a bottom layer, and a fiber cotton layer disposed between the top layer and the bottom layer. The top layer and the bottom layer are made from a non-woven fabric material, and the antibacterial sound-absorbing cotton is characterized in that the non-woven fabric material is prepared from the following raw materials in parts by weight by employing a melt blowing method: 100 parts of isotactic polypropylene, 12-15 parts of methyl methacrylate, 1-2 parts of 2-methylsuccinic acid, 1-2 parts of chlorothalonil, 2-3 parts of calcium stearate, 12-15 parts of diisobutyl phthalate, 4-6 parts of paraffin oil, 1-2 parts of zinc oxide, 10-12 parts of eggplant straw, 4-5 parts of active carbon, 2-3 parts of spatholobus stem, 1-2 parts of Chinese prickly ash, 1-2 parts of achyranthes aspera L., 2-3 parts of common clubmoss herb and 4-5 parts of an auxiliary agent. The prepared sound-absorbing cotton has antibacterial property, and is capable of satisfying the usage requirement of special industries, and the product provided by the invention has the advantages of large porosity, strong adsorptivity and the like.
Owner:芜湖跃飞新型吸音材料股份有限公司
Safe and stable medicine rubber plug material and preparing method thereof
InactiveCN106084506AGood compatibilityHigh clarityPharmaceutical containersMedical packagingBenzoyl peroxidePalmitates
The invention discloses a safe and stable medicine rubber plug material and a preparing method thereof. The safe and stable medicine rubber plug material is prepared from, by mass, 42-56 parts of butyl rubber, 14-20 parts of silicone rubber, 6-11 parts of polyether ketone, 4-9 parts of methylsuccinic anhydride, 4-8 parts of sodium p-styrenesulfonate, 3-7 parts of fucose, 4-8 parts of aspartic acid, 6-13 parts of 1,5-dimercaptopentane, 2-6 parts of 2-(2-ethoxy carbonyl allyloxy) ethylphosphonic acid, 3-7 parts of tetrabenzylthiuramdisulfide, 3-6 parts of polymethylhydrosiloxane, 4-8 parts of vitamin A palmitate, 5-9 parts of benzoyl peroxide, 4-8 parts of nano-zinc oxide and 15-23 parts of glycerinum. The prepared medicine rubber plug material is high in officinal compatibility and leakproofness and suitable for the pharmaceuticals industry as the rubber plug material is safe, stable and high in compatibility.
Owner:林春梅
Methyl aquocobyrinic acid derivative, alkylation composition, and method for detoxifying a harmful compound by utilizing the composition
InactiveUS20090306362A1Reduce decreaseCompound damageBiocideSugar derivativesAlkyl transferAcid derivative
The composition for the alkylation according to the present invention is characterized in that the composition contains a cobalt complex. The method of detoxifying the harmful compound according to the present invention, is characterized in that a harmful compound containing at least one element selected from the groups comprising arsenic, antimony and selenium is detoxified by the alkylation of the harmful compound, in the presence of the composition according to the present invention.
Owner:NIPPON SHEET GLASS CO LTD +1
Synthesis method of 2-hydroxy-2-methylsuccinic acid without metal participation
ActiveCN114835572ASource GreenHigh product valueOrganic compound preparationBiofuelsButanedioic acidPtru catalyst
The invention relates to a metal-free synthetic method of 2-hydroxy-2-methylsuccinic acid, which is characterized in that a metal-free loaded carbon-based material is used for activating an oxygen source, levulinic acid is promoted to efficiently convert, the 2-hydroxy-2-methylsuccinic acid is obtained with high selectivity, and the product yield can reach 89%. The preparation method comprises the following specific steps: sequentially adding a carbon-based material, calcium oxide and a levulinic acid solution into a high-temperature-resistant and high-pressure-resistant reaction kettle, then introducing oxygen, heating to a reaction temperature, stirring, and cooling to room temperature after the reaction time is up; and filtering the reaction liquid, and carrying out reduced pressure rotary evaporation to obtain crude 2-hydroxy-2-methylsuccinic acid. The reactants used in the invention can be prepared from biomass, the catalyst used in the invention has the advantages of low cost, mild reaction conditions, short time, simple operation and simple post-treatment, and has very important application prospects.
Owner:NANCHANG UNIV
High-elasticity butadiene-acrylonitrile latex for condoms and preparation method of high-elasticity butadiene-acrylonitrile latex
InactiveCN106317327AMeet the use requirementsImprove wear resistanceMale contraceptivesAcrylonitrilePotassium hydroxide
The invention discloses high-elasticity butadiene-acrylonitrile latex for condoms and a preparation method of the high-elasticity butadiene-acrylonitrile latex. The butadiene-acrylonitrile latex is prepared from the following raw materials in parts by weight: 100-110 parts of butadiene, 55-60 parts of acrylonitrile, 8-10 parts of methylsuccinic acid, 7-9 parts of isoprene, 0.7-0.9 part of calcium chloride, 0.6-0.8 part of potassium carbonate, 0.8-1.4 parts of potassium hydroxide, 1-2 parts of tert-dodecyl mercaptan, 3-5 parts of diallyl terephthalate, 3-6 parts of sodium laurylsulfate, 2-3 parts of sodium dodecyl benzene sulfonate and the like. The butadiene-acrylonitrile latex for the condoms disclosed by the invention has the characteristic of high strength after film forming, the usage requirements of certain high-strength film products can be met, and the generated butadiene-acrylonitrile film is high in strength, high in wear resistance and easy to disperse and emulsify; moreover, according to the added materials such as an ethylene-vinyl acetate copolymer, butadiene styrene rubber, methyl hydrogen silicone oil and the like, the elasticity of the material is increased, the wear resistance of the material is enhanced, and the condom is prevented from being damaged.
Owner:SHANDONG CHENGTAI CHEM IND
Process for preparing l- (+) -lactic acid
InactiveUS20090203937A1Prevent oxidationInhibition of polymerizationOrganic compound preparationChemical industrySodium bicarbonateMethyl pyruvate
The present invention provides a commercially viable process for the preparation of highly pure and optically active L-(+)-lactic acid and S-(−)-methyl lactate, in high yield, obtained from esterification of aqueous crude lactic acid solution produced by sugar cane juice fermentation broth and methanol in continuous counter current trickle phase approach or in continuous counter current bubble column manner, using stabilizers and the methyl lactate so obtained is recovered and followed by purification of reasonably pure methyl lactate using reagent mixture such as sodium bi-carbonate, mono-ethanolamine or di-ethanolamine, urea or sodium-bicarbonate, mono-ethanolamine or di-ethanolamine, thiourea to reduce the impurity of dimethyl ester of dicarboxylic such as dimethyl oxalate or di-methyl succinate or methyl ester of mono-carboxylic acid such as methyl pyruvate present as an impurity, so as to get highly pure S-(−)-methyl lactate followed by hydrolyzing highly pure S-(−)-methyl lactate using highly pure lactic acid as a catalyst, using highly pure water as the hydrolysis media and by using pre-treated activated carbon with dilute L-(+)-lactic acid, in batch or continuous mode. This very high pure S-(−)-methyl lactate constitutes an important product having interesting possibilities of application at an industrial level, in pharmaceuticals. Highly pure L-(+)-lactic acid thus obtained is used as an acidulant, as a food additive, for pharmaceutical applications, a monomer for making poly-lactic acid, as a monomer to prepare biodegradable polymer which are useful for manufacturing bags, application films, in the field of sanitary field, and has medical applications.
Owner:COUNCIL OF SCI & IND RES
Flux and bonded body
Disclosed are a flux containing rosin, an active agent, and a solvent, the active agent containing an imidazole compound and two dicarboxylic acids, the two dicarboxylic acids being combined with malonic acid using one selected from succinic acid, adipic acid, and sebacic acid, and a method for preparing a joined body using the flux. Or the soldering flux contains rosin, an active agent and a solvent, the active agent contains an imidazole compound and two dicarboxylic acids, and the two dicarboxylic acids are combined with succinic acid and one selected from suberic acid, sebacic acid, methylsuccinic acid, malic acid and malonic acid. According to the present invention, it is possible to provide a flux capable of increasing the leg size and suppressing the occurrence of bridging during soldering.
Owner:SENJU METAL IND CO LTD
A kind of propylene polymerization catalyst system and its application
A propylene polymerization catalyst system, comprising a solid catalytic component (A), an aluminum alkyl (B) and a multi-component external electron donor (C), wherein the component (A) is a magnesium chloride-supported Ti solid component, and contains adjacent Phthalic acid diester internal electron donor; component (B) is trialkyl aluminum; component (C) includes the first type of external electron donor and the second type of external electron donor, the first type of external electron donor The molar ratio with the second type of external electron donor is 1-70:30-99; wherein the first type of external electron donor is selected from dicyclopentyldimethoxysilane, diisopropyldimethoxysilane Silane; the second type of external electron donor is selected from di-n-butyl 2-cyano-2,3-dimethylsuccinate. The heat-resistant polypropylene obtained by using the catalyst system has high regularity and wide molecular weight distribution, so that the material has a good balance of rigidity and toughness. The technology does not need to modify the original device, is suitable for existing industrial production devices with different processes, and has good economic promotion value.
Owner:PETROCHINA CO LTD
Cell culture method
The cell culture method includes (i) culturing cells in a cell culture medium; and (ii) maintaining at least one metabolite in the cell culture medium at a below inhibitory concentration of the at least one metabolite, wherein the at least one metabolite is aconitic acid (AA), leucic acid (HICA), cytidine monophosphate (CMP), methylsuccinic acid (MSA), trigonelline (TRI), N-acetylputresinium (NAP), or a combination thereof, and the enzyme includes ADH5, BCAT1, CAT, GOT1, HADHB, HOGA1, SLC35A1, or a combination thereof.
Owner:UNIV OF MASSACHUSETTS
Application of esterase in synthesis of (R)-3-methylsuccinic acid monomethyl ester
The invention belongs to the field of biotechnology and biocatalysis, and discloses an application of esterase in synthesis of (R)-3-methyl methylsuccinate. The esterase provided by the invention has high activity and high regioselectivity to the (R)-2-dimethyl methylsuccinate, and the ratio of the obtained product (R)-3-methyl methylsuccinate to the obtained product (R)-4-methoxy-3-methyl-4-oxobutyric acid is 215: 1. The recombinant strain constructed based on the gene of the enzyme can be used for hydrolyzing (R)-2-dimethyl methylsuccinate to synthesize (R)-3-methyl methylsuccinate, the substrate tolerance is high, high-concentration feeding (50-200 g / L) can be realized, the catalytic efficiency is high, the conversion rate reaches 98% or above, no by-product is generated, the reaction period is short, the dosage of a biocatalyst is small, and the method is suitable for industrial production. The preparation method is simple and convenient, mild in condition and environment-friendly, and has a very good industrialization prospect.
Owner:TIANJIN INST OF IND BIOTECH CHINESE ACADEMY OF SCI
A nasal spray composition, nasal spray and use
The application belongs to the technical field of medicine, and specifically discloses a kind of nasal spray composition and nasal spray and application, the nasal spray composition includes the following components: hyaluronic acid, trehalose, N-acetyl-L-cysteine, methylene succinic acid, gallic acid, taurine, coenzyme Q10, rosemary essential oil.The nasal spray composition provided by the application is accurately adjusted, can give full play to the advantages of each component, provide better nasal ventilation and humidity.The nasal spray composition provided by the application can inhibit the excessive activation of LPS-induced neutrophil Netosis in vitro culture and the excessive activation of LPS-induced mouse airway neutrophil Netosis, thereby reducing the inflammatory response in the nasal cavity.
Owner:SENBAO (HANGZHOU) BRAND OPERATION CO LTD
A new synthesis method of l-menthyl-n,n-dimethylsuccinamide
ActiveCN103787905BHigh purityHigh yieldOrganic compound preparationCarboxylic acid amides preparationSynthesis methodsSuccinic acid
The invention discloses a novel synthesis method for L-menthyl-N,N-dimethyl succinamide. The method specifically comprises the following steps: adding L-mono-methyl succinate, DMF (Dimethyl Formamide) and dichloromethane into a dry four-mouth flask with a thermometer, a backflow condensing tube and a tail gas recycling device, under the condition of stirring, dropping a triphosgene solution to perform acylating chlorination reaction, dropping methanol into prepared menthyl succinic acid mono acyl chloride at low temperature to perform esterification reaction, dropping a dimethylamine solution into the prepared methyl succinic acid menthyl acetate for reaction at low temperature, adding water, stirring, standing to layer, collecting the organic phase, washing the organic phase till being neutral, depressurizing to distill so as to obtain a product, namely, L-menthyl-N,N-dimethyl succinamide. The yield of the product is 75.4%, and the product is a faint yellow liquid with the purity of 99.0%. By using the method, the purity and the yield of the product are improved, a small amount of byproducts are produced, the aftertreatment is easy to carry out, a small deal of industrial waste is generated, the production cost is lowered, and large-scale production application in industry is achieved.
Owner:ANHUI FENGLE PERFUME
High-reverse-shift elastic biomass water-based PU (Polyurethane) resin and formula development technology
The invention relates to a high-reverse-shift elastic biomass water-based PU (Polyurethane) resin and formula development technology, in particular to the field of polymer materials, in particular to a water-based biomass polyurethane emulsion, and particularly relates to polyester polyol prepared by taking 2-methylsuccinic acid (2-mSA) as a polymeric monomer as the polymeric monomer. The invention also relates to a preparation method of the water-based biomass polyurethane emulsion.
Owner:COATING P MATERIALS CO LTD
Propylene polymerization catalyst system and application thereof
The invention provides a propylene polymerization catalyst system, which comprises a solid catalytic component (A), aluminum alkyl (B) and a multi-element external electron donor (C), wherein the component (A) is a magnesium chloride-loaded Ti solid component and contains a phthalic acid diester internal electron donor, the component (B) is trialkylaluminum, the component (C) comprises a first-class external electron donor and a second-class external electron donor, the molar ratio of the first-class external electron donor to the second-class external electron donor is 1-70:30-99, the first-class external electron donor is selected from dicyclopentyl dimethoxy silane and diisopropyl dimethoxy silane, and the second-class external electron donor is selected from 2-cyano-2,3-dimethyl succinic acid di-n-butyl ester. According to the invention, the heat-resistant polypropylene obtained by using the catalyst system has high isotacticity and wide molecular weight distribution, so that the material has good rigidity and toughness balance; and according to the technology, an original device does not need to be changed, and the technology is suitable for existing different process industrial production devices and has good economic popularization value.
Owner:PETROCHINA CO LTD
A kind of method of aqueous phase catalytic synthesis methylsuccinic acid
ActiveCN106554268BCarboxylic preparation by ozone oxidationChemical recyclingItaconic acidOrganic synthesis
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Polyester resin for high-temperature-resistant and high-leveling HAA powder coating and preparation method
PendingCN119119444Alow costImprove the lubrication effectPowdery paintsPolyester coatingsGlutaric anhydridePolymer science
The invention relates to polyester resin for a high-temperature-resistant and high-leveling HAA powder coating, and the polyester resin is obtained by polymerizing the following raw materials: chlorophenyl methyl dichlorosilane, dimethyl dichlorosilane, 2-methyl-1, 3-propylene glycol, 3-tert-butyl dimethyl siloxy glutaric anhydride, neopentyl glycol and 2-ethyl-2-methylsuccinic acid. The prepared polyester resin is low in acid value and large in terminal carboxyl steric hindrance, on one hand, the use amount of an HAA curing agent needed during curing is small, the cost of the powder coating is reduced, on the other hand, water molecules generated during curing are reduced, the curing and leveling time is prolonged, full escape of small molecule water is facilitated, the effect of resisting thick coating pinholes is obvious, and the coating effect is good. And a coating film cured with HAA is resistant to high temperature and relatively good in leveling property.
Owner:安徽正杰科技有限公司
Narrow-granularity thermally-stable tungsten carbide powder and preparation method thereof
InactiveCN114772599ARealize self-lubricationAchieving Corrosion ResistanceTungsten/molybdenum carbideTungstateThiadiazoles
The invention discloses narrow-granularity thermally-stable tungsten carbide powder and a preparation method thereof, and relates to the technical field of metal powder. The preparation method comprises the following steps: firstly, alternately etching graphite by using hydrogen and oxygen plasmas, and then stripping by using an adhesive tape and ultrasonic airflow to obtain a narrow-granularity graphene nanosheet; the preparation method comprises the following steps: solidifying an ammonium tungstate solution at an ultralow temperature to wrap all graphene nanosheets, and then growing tungsten carbide nanosheets on the surfaces of the graphene nanosheets through an alternating microwave magnetic field to obtain graphene-tungsten carbide-graphene sandwich type nanosheet powder, so that the surface roughness of the tungsten carbide powder is reduced, and the self-lubricating effect of the tungsten carbide powder is realized; the preparation method comprises the following steps: firstly preparing a graphene nanosheet, then modifying the graphene nanosheet by using dimethyl succinic anhydride, 2-chlorobenzoin aldehyde, 2, 5-dimercapto-1, 3, 4-thiadiazole and hydrazine hydrate to form a thicker and compact protective film and an isolating layer, and effectively blocking corrosion elements. The prepared tungsten carbide powder has the effects of narrow particle size distribution, self-lubrication and corrosion resistance.
Owner:滁州用朴新材料科技有限公司
Method for aqueous-phase catalytic synthesis of methyl succinic acid
ActiveCN106554268ACarboxylic preparation by ozone oxidationChemical recyclingItaconic acidOrganic synthesis
The invention discloses a method for aqueous-phase catalytic synthesis of methyl succinic acid. The methyl succinic acid is an important organic synthesis intermediate and is wide in application. According to the method disclosed by the invention, a Ru-based catalyst is adopted to make itaconic acid have a catalytic hydrogenation reaction to prepare the methyl succinic acid under an aqueous-phase neutral and moderate reaction condition, the conversion rate and the selectivity can both be as high as 99%, and the catalyst can be used repeatedly.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI