Product
Patsnap Eureka
For R&D, Patsnap Eureka makes reading and utilizing patents & technical documents easy.
Patsnap Eureka AIR
Designed for self-driven R&D workflows. Generate viable solutions, solve complex R&D challenges, empower your innovation with AI.
Patsnap Eureka Materials
Designed for material experts only. Revolutionize your material R&D, from search, analyze, to developing new materials.
Feature
TechResearch
Generate reliable direction feasibility study reports for your R&D in just a few steps.
TechSeek
Discover and master advanced knowledge NOW. Basics, ideas, possibilities, all at once.
TechMind
As an expert in R&D Theories, TechMind can generates customized viable solutions instantly.
TechRisk
Analyze your overall solution with one click, know your potential R&D risks in advance.
TechMonitor
Get weekly tech updates, stay abreast of the latest tech innovations and key insights.
Patents
Literature
Hiro is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
83 results about "Maleic acid diethyl ester" patented technology
Efficacy Topic
Property
Owner
Technical Advancement
Application Domain
Technology Topic
Technology Field Word
Patent Country/Region
Patent Type
Patent Status
Application Year
Inventor
Method for preparing trinexapac-ethyl
InactiveCN1850776AEasy to operateMild responseOrganic compound preparationCarboxylic acid esters preparationHigh pressureMedicinal chemistry
This invention discloses anti inverse ester preparation method. 2-acetonyl-1, 4 diethyl succiante is high pressure condensed by diethyl maleate and acetone under organic amine condition. Then it cycles to get 3, 5-dioxygen hexahydrobenzoic acid ethyl esterunder sodium alcoholate condition, finally anti inverse ester is got by reacting with ring third formic anhydride under alkali condition. The operation is simple, reaction is wild, material is easy to get, yield is high, product purity is high, and generating cost is reduced, so it is propitious to industrial manufacure.
Owner:ZHEJIANG UNIV
Method for preparing trinexapac-ethyl
InactiveCN102101830AHigh yieldHigh purityOrganic compound preparationCarboxylic acid esters preparationSuccinic acidHigh pressure
The invention discloses a method for preparing trinexapac-ethyl, which comprises the following steps of: performing high pressure condensation on diethyl maleate and acetone serving as raw materials in the presence of diethylamine to obtain 2-acetone-1,4-succinic acid diethyl ester; forming a ring in the presence of sodium hydride to obtain 3-ethoxycarbonyl-5-oxocyclohexyl-1-ene-1-sodium alkoxide; reacting with cyclopropanecarboxylic acid chloride to obtain 3-ethoxycarbonyl-5-oxocyclohexyl-1-ene-1-cyclopropanecarboxylic acid ester alkoxide; and rearranging in the presence of cyanide and triethylamine to obtain the trinexapac-ethyl. The method has the advantages of high yield, mild reaction and high product purity, and is suitable for small-scale laboratorial preparation and industrial production.
Owner:张家港田由新材料科技有限公司
Polyurea floor coating and preparation and application methods thereof as well as carbamide resin
InactiveCN104497824AImprove wear resistanceImprove aging resistancePolyurea/polyurethane coatingsPolyaspartic acidAging resistance
The invention discloses a polyurea floor coating and preparation and application methods thereof as well as carbamide resin. The carbamide resin is polyaspartic acid ester carbamide resin; the polyaspartic acid ester carbamide resin is prepared by reacting diethyl maleate and 3,3-dimethyl-4,4-methylenebis(cyclohexylamine) as raw materials at 60-80 DEG C for 70-74 DEG C, with the weight ratio of the diethyl maleate to the 3,3-dimethyl-4,4-methylenebis(cyclohexylamine) is 1.0 to (1.55-1.60). The polyaspartic acid ester carbamide resin can stably exist at a room temperature; the polyaspartic acid ester carbamide resin is taken as a base component; and packing, an assistant and the like are added, so as to prepare the polyurea floor coating disclosed by the invention. The polyurea floor coating and an HDI curing agent are mixed to use at a certain ratio, so that the polyurea floor coating has the advantages of good abrasive resistance, ageing resistance, waterproofness, controllable elasticity and high-strength shock resistance.
Owner:SHENZHEN JIADA HIGH TECH IND DEV
Concrete with low slump loss and preparation method thereof
InactiveCN109650794ABoost and Compensate StrengthEnhance and compensate for poor dry shrinkage resistance in later stagesFiberSulfonate
The invention discloses a concrete with low slump loss and a preparation method thereof, and relates to the technical field of concrete. The concrete comprises following components in parts by weight:240 to 420 parts of cement, 70 to 100 parts of fly ash, 900 to 1000 parts of river sand, 950 to 1100 parts of broken stone, 190 to 210 parts of water, 5 to 10 parts of water reducer, and 1.8 to 2.2 parts of combined fiber. The water reducer is prepared by the following steps: adding methyl allyl polyoxyethylene ether, diethyl maleate, and water into a reactor, evenly mixing, stirring, then simultaneously dropwise adding maleic anhydride, a water solution of sodium methyl allyl sulfonate, and a water solution of ammonium persulfate, after dropwise addition, keeping the temperature for one hour, cooling to the room temperature, and adjusting the pH value to 5-7 by a hot NaOH saturated solution. The concrete has good dispersibility and fluidity after the modified water reducer is added, andthe concrete quality is largely improved.
Owner:上海练定新材料科技有限公司
Preparation method of trinexapac-ethyl and intermediate thereof
ActiveCN105085270AImprove qualityGood process reaction selectivityOrganic compound preparationCarboxylic acid esters preparationAcetoacetatesFormate
The invention discloses a preparation method of trinexapac-ethyl and an intermediate thereof. The method comprises the following steps: under the action of an alkali, reacting acetoacetic ester (I) with diethyl maleate to obtain an intermediate (II), continuing reaction under the action of an acid to obtain diethyl 2-acetonyl-1,4-succinate; cyclizing the diethyl 2-acetonyl-1,4-succinate in the presence of an alkali, and acidifying to obtain ethyl 3,5-cyclohexyldione-formate; esterifying the ethyl 3,5-cyclohexyldione-formate and cyclopropyl formyl chloride in the presence of an acid-binding agent to obtain ethyl 4-cyclopropylformacyl-3,5-dione cyclohexane-carboxylate; and carrying out reaction on the end product under the actions of an organic alkali and a catalyst to obtain the trinexapac-ethyl. The technique has the advantages of favorable reaction selectivity, high yield and fewer byproducts, and is beneficial to obtaining the high-quality trinexapac-ethyl product. The method does not have high requirements for equipment, and avoids high-temperature high-pressure reaction. The method has the advantages of simple technique and mild reaction conditions, and is suitable for industrialization.
Owner:MAX RUDONG CHEM
Method and device for producing diethyl maleate by virtue of rectification and steam osmosis coupling
ActiveCN104262140AAvoid Reprocessing FeesAvoid secondary pollutionOrganic compound preparationCarboxylic acid esters preparationPressure differenceMixed gas
The invention relates to a method and device for producing diethyl maleate by virtue of rectification and steam osmosis coupling, belonging to the technical field of separation and application of pervaporation membranes. The method comprises the following steps: in a reaction kettle, heating maleic acid and ethanol under the action of a catalyst to generate diethyl maleate and water, enabling a gaseous mixture above the reaction kettle to flow through a rectification column under the driving of pressure difference, performing heat exchange on the gaseous mixture and a reflux liquid to ensure that ethanol and water mixed gas can flow out from the top of the rectification column, replenishing heat for the ethanol and water mixed gas, putting the ethanol and water mixed gas into steam osmosis membrane equipment, then performing dehydration, condensing dehydrated ethanol, and conveying ethanol to the reaction kettle from the top of the rectification column. A process method disclosed by the invention ensures that water in an esterification reaction system is continuously removed under the condition that other impurities are not introduced, so that the reaction can be promoted to the generation direction of diethyl maleate, and the conversion rate of the reaction can be effectively improved; and an overall esterification reaction and steam osmosis coupling system is less in floor area, is easy to amplify, and is low in energy consumption.
Owner:JIANGSU NINE HEAVEN HIGH TECH
One-pot preparation method of vitamin B6
The invention relates to a new one-pot preparation method of vitamin B6. The method includes that 5-ethoxy-4-methyloxazole which is a key intermediate of vitamin B6 and dimethyl maleate or diethyl maleate are subjected to Diels-Alder addition reaction and aromatization to further form pyridine rings, and then the pyridine rings undergo hydrogenation to be catalytically reduced to vitamin B6. The one-pot method is adopted, so that the intermediates can directly react without separation. The period of technological processes is shortened, and the one-pot preparation method of vitamin B6 is simple in operation, environment-friendly and low in cost. Moreover, the selectivity, the yield and the purity of the product are high, and the method is more suitable for being used for large-scale industrial production.
Owner:XINFA PHARMA
Preparation methods for important intermediates of anthranilic diamide compound
The invention discloses preparation methods for important intermediates of an anthranilic diamide compound, particularly relates to intermediates 2-hydrazino-3-chloropyridine and 1-(3-chloro-2-pyridy)-3-pyrazolidone-5-acetylenecarboxylate and belongs to the technical field of chemical synthesis methods. The preparation method for 2-hydrazino-3-chloropyridine comprises the following steps of: refluxing 2,3-dichloropyridine used as a raw material in hydrazine hydrate and an organic solvent for 6 to 12 hours, and cooling to crystallize to obtain 2-hydrazino-3-chloropyridine. The preparation method for 1-(3-chloro-2-pyridy)-3-pyrazolidone-5-acetylenecarboxylat comprises the following steps of: adding organic solvent and corresponding alkali into 2-hydrazino-3-chloropyridine, adding diethyl maleate, after the raw material disappears, adding glacial acetic acid and refluxing for half an hour, and cooling to obtain white 1-(3-chloro-2-pyridy)-3-pyrazolidone-5-acetylenecarboxylate. By adopting the technology, the yield of 2-hydrazino-3-chloropyridine can reach over 95 percent, and the purity of 2-hydrazino-3-chloropyridine can reach over 95 percent; the yield of 1-(3-chloro-2-pyridy)-3-pyrazolidone-5-acetylenecarboxylate reaches over 70 percent, and the purity of 1-(3-chloro-2-pyridy)-3-pyrazolidone-5-acetylenecarboxylate can reach over 98 percent; and a process is simple, raw materials can be obtained easily, the yield is high, and the purity of a product is high, and the preparation methods are suitable for industrial production.
Owner:EAST CHINA UNIV OF SCI & TECH
Preparation method of chlorantraniliprole
ActiveCN112552284AShort reaction timeHigh selectivityOrganic chemistryHeterogenous catalyst chemical elementsPtru catalystHydrolysis
The invention relates to the field of insecticide synthesis, and discloses a preparation method of chlorantraniliprole. The preparation method comprises the following steps: synthesis of an intermediate I, synthesis of an intermediate II and synthesis of chlorantraniliprole. The method comprises the following steps: reacting 2, 3, 6-trichloropyridine serving as a raw material with hydrazine hydrate under the action of a catalyst A to obtain 3, 6-dichloro-2-hydrazinopyridine, carrying out hydrogenation reduction reaction under the action of a catalyst B to obtain an intermediate I, reacting theintermediate I with diethyl maleate, and preparing the 2-(3-chloropyridine-2-yl)-5-hydroxypyrazole-3-ethyl formate under the action of a catalyst C, and hydrolyzing after bromination to obtain an intermediate II, and preparing chlorantraniliprole from the intermediate II. According to the invention, 2, 3, 6-trichloropyridine is adopted to replace 2, 3-dichloropyridine as a raw material to preparethe intermediate I, so that the defects of difficulty in obtaining the 2, 3-dichloropyridine raw material, harsh synthesis conditions, low yield and the like are avoided, the total reaction yield ofthe intermediate I is improved, the intermediate II is prepared by a one-pot method, the post-treatment operation is reduced, and the synthesis cost of chlorantraniliprole is reduced.
Owner:CHONGQING HUAGE BIOCHEM
Polyurea coating, preparation method and application thereof, and polyurea coating layer
ActiveCN108559384AImprove anti-corrosion performanceLarge specific surface areaPolyurea/polyurethane coatingsAccelerated agingPolypropylene glycol
The invention provides a polyurea coating, a preparation method and the application thereof, and a polyurea coating layer. The polyurea coating provided by the invention comprises the following components: a component A, a component B and a nano slurry; the component A is prepared from raw materials including diisocyanate and polypropylene glycol; the component B comprises polyoxypropylene diammonium, diethyl maleate, a dispersant, a leveling agent and a defoaming agent; the nano slurry comprises nano silicon dioxide and an accelerator; the mass ratio of the component A to the component B is 1to 1-4; and the mass ratio of the component B to the nano slurry is 1 to 2.5-6%. The polyurea coating and the polyurea coating layer provided by the invention have good wear resistance, adhesive force, 60-degree gloss, flexibility, salt fog resistance and artificial accelerated aging performance, wherein the salt fog resistance is more than or equal to 1000h.
Owner:SHANGHAI UNIV
Method for synthesizing aliphatic nano organic titanium polyaspartic acid ester and paints thereof
ActiveCN103396553AConjugated diene hydrocarbon coatingsAnti-corrosive paintsPolymer sciencePolyaspartic acid
The inventon relates to a method for synthesizing an aliphatic nano organic titanium polyaspartic acid ester and paints thereof, comprising the following steps of: (1) aliphatic primary amine PACM (or LAROMIN C260) and DEF (diethyl maleate) perform Michael addition reaction to obtain a reaction product A (or B); and (2) the product A (or B) and nano organic titanium precursor oligopolymer (HTH) performs addition reaction to synthesize the aliphatic nano organic titanium polyaspartic acid ester (T-PAEs). Using as a matrix and compounded with a relative auxiliary film forming resin, paint auxiliary agents, pigments, fillers and a matched curing agent based on formula amounts, the aliphatic nano organic titanium polyaspartic acid ester can be prepared to be environment-friendly and solvent-free nano organic titanium sea heavy duty anticorrosion paints.
Owner:IANGSU JINLING SPECIAL PAINT CO LTD
Method of treating glutathione deficient mammals
InactiveUSRE39705E1Stimulate natural productionAntibacterial agentsOrganic active ingredientsRate limitingVitamin C
Glutathione (GSH) is a tripeptide of extreme importance as a catalyst, reductan, and reactant. It can be depleted intra-cellularly either by forming a direct complex with an electrophilic agent (accomplished investigationally by agents such as bromobenzene or diethyl maleate), by way of inhibition of synthesis, or by subjecting cells to oxidant stress. Most cells, except for epithelia cells, do not have a direct transport capacity for intact GSH. Non-epithelial cells must either transport precursor substrates for GSH synthesis or salvage amino acids from circulating GSH for reuse in intracellular resynthesis. Dietary cysteine is a rate limiting substrate for the synthesis of glutathione and also inhibits GSH efflux. Although GSH is synthesized from precursors in virtually all cells, the liver is the main source of plasma GSH. Protection and support of liver function is paramount to elevating GSH levels. The disclosure is also of a unique combination of nutritional supplements including n-acetyl cysteine, vitamin C, 1-glucosamine, n-acetyl d-glucosamine, quercitin, sylimarin, Alpha lipoic acid and high protein, low fat whey that are combined to support various bodily systems involved in glutathione synthesis, reutilization and storage; all intended to elevate glutathione concentration in the mammalian cell.
Owner:VIT IMMUNE L C
Compound chemotherapy medicament for treating liver cancer and multi-drug resistance tumor
The invention discloses medicinal application of a compound chemotherapy medicament of artemisinins (dihydroartemisinin, artemisinin succinate, artemisinin methyl ether, or artemisinin ethyl ether), glutathione depleting agents (diethyl maleate, N-ethyl-maleimide or buthionine sulfoximine) and antioxidant enzyme inhibitors (mercapto-succinic acid and 3-amino-triazole), wherein the compound chemotherapy medicament can be used as the compound chemotherapy medicament for liver cancer and multi-drug resistance tumor with efficient, quick effect, low toxicity and low cost. Liver cancer and multi-drug resistance tumor patients orally take the medicament or are applied by intravenous injection; the everyday treatment dosage comprises 1 to 100 milligrams per kilogram of the dihydroartemisinin, the artemisinin succinate, the artemisinin methyl ether or the artemisinin ethyl ether, 1 to 80 millimoles per kilogram of the diethyl maleate, the N-ethyl-maleimide or the buthionine sulfoximine, 1 to 50 milligrams per kilogram of the mercapto-succinic acid, and 1 to 50 milligrams per kilogram of the 3-amino-triazole; the medicament can be used once or repeatedly; and after the treatment, the tumor can disappear or the proliferation of the tumor can be controlled, so the patients can live for a long time and work normally.
Owner:曾庆平
Polyurea coating, coating and preparation method thereof
ActiveCN113004777ASeamlessHydrophobic with fluororesinAnti-corrosive paintsPolyurea/polyurethane coatingsPolyaspartic acidEthyl ester
The invention discloses a polyurea coating, a coating and a preparation method thereof, and relates to the technical field of coatings. The polyurea coating comprises a component A, and the component A is a mixture of resin, pigment filler and auxiliaries and comprises the following components in parts by weight: 60-90 parts of organic fluorine-silicon modified polyaspartic acid ester resin, 20-40 parts of pigment filler and 1-5 parts of auxiliaries; the preparation method of the organic fluorine-silicon modified polyaspartic acid ester resin comprises the following steps: (1) mixing polyaspartic acid ester resin, gamma-aminopropyl trialkoxysilane and trifluoropropyl methyl cyclotrisiloxane, introducing inert gas, heating to 50-60 DEG C after 5-10 minutes, and dropwise adding diethyl maleate while stirring to obtain a mixture; and (2) carrying out heat preservation reaction on the mixture for 8-16 hours, and cooling to obtain the organic fluorine-silicon modified polyaspartic acid resin.
Owner:SUN YAT SEN UNIV
Golf balls comprising thermoplastic or thermoset composition having controlled gel time
A golf ball comprising a core and at least one layer disposed about the core, wherein at least one of the core and the layer comprises a thermoplastic or thermoset composition comprising a reaction product of a polyurethane or polyurea prepolymer comprising at least one isocyanate and a curative comprising a blend of at least one aliphatic diamine and at least one polyaspartic ester formed from reactants comprising at least one aliphatic primary polyamine and at least one maleic or fumaric diester, and wherein the thermoplastic or thermoset composition comprises a gel time of about 90 seconds or greater. Also, a golf ball comprising a core and at least one layer disposed about the core wherein at least one of the core and the layer comprises a thermoplastic or thermoset composition T comprising a reaction product of a polyurethane or polyurea prepolymer P comprising at least one isocyanate and a curative C comprising a blend of at least one aliphatic diamine D and at least one polyaspartic ester formed from reactants comprising at least one aliphatic primary polyamine and at least one maleic or fumaric diester, wherein the thermoplastic or thermoset composition T has a gel time X such that X>1.25Y, and wherein Y is the gel time of a thermoplastic or thermoset composition T′ comprising a reaction product of the polyurethane or polyurea prepolymer P and a curative C′ comprising a blend of aliphatic diamine D and a polyaspartic ester consisting of N,N′-diethylmaleate-2-methyl-pentamethylene diamine.
Owner:ACUSHNET CO
Method for catalytically synthesizing diethyl maleate by using acidic ionic liquid
PendingCN111269117AImprove thermal stabilityHigh catalytic activityOrganic compound preparationOrganic-compounds/hydrides/coordination-complexes catalystsPtru catalystIonic liquid
The invention discloses a method for catalytically synthesizing diethyl maleate by using acidic ionic liquid. The method comprises the following steps: using maleic anhydride and absolute ethyl alcohol as raw materials, using the acidic ionic liquid as a catalyst and using cyclohexane as a water-carrying agent to be added into a reaction bottle, heating, stirring, reacting, condensing and refluxing; after the reaction is finished, standing and layering into a reaction product layer and a catalyst layer, washing the reaction product layer with a sodium bicarbonate aqueous solution and distilledwater in sequence, and drying to obtain a diethyl maleate product, wherein the acidic ionic liquid is one of the following components. The method has the advantages of high product yield, high product purity, good catalyst separation efficiency and the like, and the recovered catalyst can be reused. The method can effectively reduce the cost of subsequent treatment of wastewater pollution and theuse cost of the catalyst and has a very good application prospect.
Owner:ZHEJIANG UNIV OF TECH
Polyurea floor coating material, preparation method and use method thereof, and polyurea resin
InactiveCN109251644AImprove wear resistanceImprove aging resistancePolyurea/polyurethane coatingsPolyasparticMethyl cyclohexane
The invention discloses a polyurea floor coating material, a preparation method and a use method thereof, and a polyurea resin, wherein the polyurea resin is a polyaspartic ester polyurea resin, and diethyl maleate and 3,3-dimethyl-4,4-diaminodicyclohexylmethane are used as raw materials and are subjected to a reaction for 70-74 h at a temperature of 60-80 DEG C according to a weight ratio of 1.0:1.55-1.60 to prepare the polyaspartic ester polyurea resin. According to the present invention, the polyaspartic ester polyurea resin can stably exist at a normal temperature; the polyurea floor coating material can be prepared by using the polyaspartic acid ester polyurea resin as the matrix component and adding the filler, the auxiliary agent and the like; and after the polyurea floor coating material and the HDI type curing agent are mixed according to a certain ratio, the advantages of good wear resistance, good aging resistance, good water resistance, controlled elasticity and high impactresistance can be achieved.
Owner:游代华
Method of treatment of glutathione deficient mammals
Glutathione (GSH) is a tripeptide of extreme importance as a catalyst, reductan, and reactant. It can be depleted intracellulary either by forming a direct complex with an electrophilic agent (accomplished investigationally by agents such as bromobenzene or diethyl maleate), by way of inhibition of synthesis, or by subjecting cells to oxidant stress. Most cells, except for epithelia cells, do not have a direct transport capacity for intact GSH. Non-epithelial cells must either transport precursor substrates for GSH synthesis or salvage amino acids from circulating GSH for reuse in intracellular resynthesis. Dietary cysteine is a rate limiting substrate for the synthesis of glutathione and also inhibits GSH efflux. Although GSH is synthesized from precursors in virtually all cells, the liver is the main source of plasma GSH. Protection and support of liver function is paramount to elevating GSH levels. The disclosure is also of a unique combination of nutritional supplements including n-acetyl cysteine, vitamin C, l-glucosamine, n-acetyl d-glucosamine, quercitin, sylimarin, Alpha lipoic acid and high protein, low fat whey that are combined to support various bodily systems involved in glutathione synthesis, reutilization and storage; all intended to elevate glutathione concentration in the mammalian cell.
Owner:VIT IMMUNE L C
Aspartic ester self-leveling coating and preparation method thereof
ActiveCN106867377ASlow reaction speedExtended operating timePolyurea/polyurethane coatingsReaction speedQuartz
Belonging to the field of coating processing, the invention in particular relates to an aspartic ester self-leveling coating and a preparation method thereof. The coating comprises the following components: 97.8 weight parts of aspartic ester; 1 weight part of a dispersant; 0.3 weight part of a defoaming agent; 0.5 weight part of a wetting agent; 0.4 weight part of a leveling agent; and 140-160 weight parts of quartz sand. According to the invention, di-n-butyl maleate is adopted as the raw material to replace a part of diethyl maleate to react with diamine so as to prepare aspartic ester. The branch chain extension reduces the overall reaction speed of aspartic ester, the usable time of the coating is prolonged, and the coating still can maintain the fast drying characteristic. The prepared paint film has excellent surface state.
Owner:SHENZHEN FEIYANG JUNYAN TECH DEV
Modified plastic granules for accelerator pedal of automobile
The invention discloses modified plastic granules for an accelerator pedal of an automobile and relates to the technical field of plastic parts of automobiles. The modified plastic granules are prepared from raw materials in parts by weight as follows: 100-110 parts of polypropylene, 50-60 parts of diethyl maleate, 10-15 parts of nano-carbon fiber, 15-20 parts of microcrystal ceramic powder, 12-16 parts of modified straw powder, 10-15 parts of gypsum powder, 10-15 parts of palm oil, 10-15 parts of soy protein concentrate, 7-12 parts of glycerol monolaurate, 6-10 parts of pentaerythritol, 6-10 parts of epoxy acetyl methyl linoleate, 5-8 parts of ascorbic acid palmitate, 5-8 parts of a styrene-butadiene-styrene block copolymer, 4-6 parts of zinc laurate soap, 3-5 parts of sulfur, 2-4 parts of dodecyl dimethyl betaine and 60-70 parts of ethanol. The modified plastic granules have good machining forming performance, an accelerator pedal sheath, made from the modified plastic granules, of the automobile have excellent abrasive resistance, water resistance and anti-aging performance and can effectively protect the accelerator pedal, the braking performance is improved due to the friction force between the accelerator pedal and a sole, and the driving safety is guaranteed.
Owner:JIESHOU DONGWEI PLASTIC IND CO LTD
Improved method for producing prohexadione
The invention discloses a making method of tranexamic acid [3,5-dioxo-4-propionyl cyclohexane carboxyl acid (calcium)], which comprises the following steps: adopting diethyl maleate as initial raw material; additioning diethyl maleate and acetone; obtaining the object through Claisen condensation, acylation, rearrangement, hydrolysis and salt precipitation; using the catalyst as N-(C1-C6) alkyl imidazole compound. The invention simplifies the operation and saves the preparing cost, which lays the groundwork for scale commerce of tranexamic acid.
Owner:EAST CHINA UNIV OF SCI & TECH +1
Diethyl maleate preparation method
InactiveCN105399623AImprove conversion rateSolve the emission problemOrganic compound preparationCarboxylic acid esters preparationAlcoholRoom temperature
The present invention discloses a diethyl maleate preparation method, which concretely comprises: adding maleic anhydride, absolute alcohol, a solid acid catalyst and a water carrying agent to a reaction container, installing a water segregator, a reflux condensation pipe and a thermometer on the reaction container, heating to carry out reflux water separation, carrying out a reaction until no water drop appears, then continuously carrying out the reaction for 25-30 min, stopping the heating, carrying out room temperature cooling for 30 min, discharging the water layer, washing the reaction solution with water, drying, distilling, distilling out the front distillate, and collecting the distillate with a temperature of 216-220 DEG C so as to obtain the product. According to the present invention, the solid acid catalyst is used, such that the fed material conversion rate can be improved to more than or equal to 99.5% from the usual less than or equal to 95%; and the waste liquid emission problem caused by the addition of sodium carbonate to neutralize the excess acid in the liquid catalyst process can be avoided.
Owner:常州市松盛香料有限公司
Preparation method of organic titanium polyaspartic acid ester and application thereof in ocean heavy anticorrosive coatings
The invention relates to a preparation method of organic titanium polyaspartic acid ester and application thereof in ocean heavy anticorrosive coatings, and belongs to the technical fields of preparation and application of novel materials. The preparation method comprises the following steps of firstly, under the catalyzing function of gamma-phase nanometer aluminum oxide, putting a mixture of titanium hydride powder, epoxy resin, nanometer dispersant, titanate coupling agent, silane coupling agent and solvent into a ball mill reaction tank, and performing ball milling reaction under ultrasonic conditions, so as to obtain an organic titanium precursor polymer TTP-II; performing addition reaction on 4,4'-diaminocyclohexyl methane and diethyl maleate under a non-oxygen condition, so as to obtain an intermediate product; performing synthetic reaction on the intermediate product and the organic titanium precursor polymer TPP-II, so as to obtain the organic titanium polyaspartic acid ester.The organic titanium polyaspartic acid ester can be used for preparing ocean heavy anticorrosive primers, intermediate paints and topcoats, and can meet the underwater test requirements; the chalkinggrade is lower than or equal to 1, and the discoloring grade is lower than or equal to 1.
Owner:IANGSU JINLING SPECIAL PAINT CO LTD
Method for synthesizing prohexadione calcium and trinexapac-ethyl
ActiveCN107162907ASimple and safe operationEasy for industrial scale-upOrganic compound preparationCarboxylic acid esters preparationCarboxylic acidTrinexapac-ethyl
The invention discloses a method for synthesizing prohexadione calcium and trinexapac-ethyl. The method comprises the following steps: reacting diethyl maleate (alpha, beta unsaturated carboxylic acid) with sodium ethoxide to obtain high-purity intermediate compound as shown in a formula II, and preparing prohexadione calcium and trinexapac-ethyl from the compound as shown in the formula II. In the reacting steps for preparing the compound as shown in the formula II, sodium ethoxide serving as a reactant participates in the reaction rather than a strong basic catalyst; a 1,3-cyclohexanedione compound is prepared from the intermediate compound as shown in the formula II and acetone under a reflux condition, and the total yield for the reaction of two steps can be 87 percent. The method has the advantages of low energy consumption, short reaction time, easy operation and the like by using the 1,3-cyclohexanedione compound as the intermediate, and can be used for preparing prohexadione calcium and trinexapac-ethyl with high yield.
Owner:鹤壁全丰生物科技有限公司
High temperature tolerant paint
InactiveCN104927436AImprove high temperature resistanceImprove water resistanceCoatingsXylylenePolymer science
A high temperature tolerant paint is made from, by weight, 4 to 8 parts of tritolyl phosphate, 3 to 7 parts of clay gel, 8 to 14 parts of tung oil, 5 to 7 parts of linseed oil, 9 to 16 parts of thinner, 20 to 25 parts of antistatic agent, 4 to 6 parts of leveling agent, 25 to 36 parts of matrix resin, 8 to 12 parts of ethyl acetate, 14 to 17 parts of xylene, 6 to 15 parts of maleic acid diethyl ester, 4 to 8 parts of phenoxy carboxylic acid, 20 to 26 parts of thermoplastic polyimide, 15 to 22 parts of diatomite, 20 to 30 parts of styrene butadiene rubber, 4 to 8 parts of n-butyl stearate, and 10 to 24 parts of methyl malonate. The high temperature tolerant paint is excellent in high temperature tolerance and water tolerance, good in construction stability, high in wear resistance, and widely applicable.
Owner:QINGDAO ENGAO MOTION CONTROL TECH
Preparation method of nanometer modified polyurea waterproof coating
InactiveCN108276883AImprove wettabilityHigh reactivityPolyurea/polyurethane coatingsUltravioletZno nanoparticles
Owner:陈毅忠
Bisamide compound and synthesizing method and application thereof
The invention discloses a bisamide compound and a synthesizing method and application thereof. The synthesizing method includes: allowing 2,3-dichloropyridine to have reaction with hydrazine hydrate to obtain 3-hydrazino-2-chloropyridine; subjecting the 3-hydrazino-2-chloropyridine and diethyl maleate to cyclization and hydrolysis to obtain 3-hydroxy-1-(3-chloropyridine-2-yl)-1H-pyrazol-5-formic acid; subjecting the 3-hydroxy-1-(3-chloropyridine-2-yl)-1H-pyrazol-5-formic acid and substituted o-amino-benzoic acid to cyclization to obtain 2-(-1-(3-chloropyridine-2-yl)-1-H-pyrazol-5-yl)-8-methyl-4H-3,1- benzoxazine-4-ketone; subjecting the 2-(-1-(3-chloropyridine-2-yl)-1-H-pyrazol-5-yl)-8-methyl-4H-3,1- benzoxazine-4-ketone and 40% ammonia water solution to aminolysis to obtain the bisamide compound. The compound containing the bisamide group is simple to prepare, excellent in insecticidal activity and capable of being used as an insecticide.
Owner:ZHEJIANG UNIV OF TECH
Method for preparing trinexapac-ethyl
InactiveCN100398508CEasy to operateMild responseOrganic compound preparationCarboxylic acid esters preparationHigh pressureMedicinal chemistry
This invention discloses anti inverse ester preparation method. 2-acetonyl-1, 4 diethyl succiante is high pressure condensed by diethyl maleate and acetone under organic amine condition. Then it cycles to get 3, 5-dioxygen hexahydrobenzoic acid ethyl esterunder sodium alcoholate condition, finally anti inverse ester is got by reacting with ring third formic anhydride under alkali condition. The operation is simple, reaction is wild, material is easy to get, yield is high, product purity is high, and generating cost is reduced, so it is propitious to industrial manufacure.
Owner:ZHEJIANG UNIV
Novel anti-crack fiber and composite material preparation method
InactiveCN113445145AImprove performanceHigh hardnessMonocomponent polyolefin artificial filamentArtifical filament manufactureFiberPolypropylene
The invention discloses a novel anti-crack fiber and composite material preparation method. The formula comprises polypropylene, diethyl maleate, styrene, dicumyl peroxide, polyurethane resin, a reinforcing agent, an organic silicon defoaming agent and a coloring agent, and specifically 82-94 parts of polypropylene, 17-23 parts of diethyl maleate, 6-10 parts of styrene, 2-4 parts of dicumyl peroxide, 9-13 parts of polyurethane resin, 3-7 parts of the reinforcing agent, 1-3 parts of the organic silicon defoaming agent and 1-3 parts of the coloring agent in parts by weight. The composite material is used for replacing a traditional single material, the performance of the anti-crack fiber is reinforced, the use requirement of a high-strength scene is met, the application range of the anti-crack fiber is expanded, and the service life of the anti-crack fiber is prolonged; and polypropylene is subjected to grafting modification treatment in the preparation process, therefore, the performance of polypropylene is improved, and the comprehensive performance of the anti-crack fiber is improved.
Owner:惠州市恒泰富复合材料有限公司
Preparation method for solid catalyst for ozone heterogeneous oxidization
InactiveCN107008371AEvenly dopedImprove adsorption capacityCatalyst carriersOther chemical processesUltrasound - actionLithium hypochlorite
The invention relates to a preparation method for a solid catalyst for ozone heterogeneous oxidization and belongs to the technical fields of environmental protection and chemical engineering catalysis. The preparation method comprises the following steps: by taking an activated carbon, carnallite, aluminum hydroxide, phosphorite, illite and ulexite porous material as a carrier, modifying the carrier by broaching with lithium hypochlorite and bis(acetylacetone) beryllium, and then adding a surfactant diethyl maleate bi(dodecyl dimethyl hydroxyethyl ammonium chloride) and performing surface activating treatment under the effect of ultrasonic waves; performing a hydrothermal reaction on an ultrasonic surface activated carrier, a compound mineralizer including borax and potassium sulphate, catalytic activated assistant precursors, including tricyclopentadiene promethium, terbium acetate hydrate, holmium oxalate hydrate and lutetium carbonate hydrate rare-earth metal organic compound and catalytic active core component precursors, including common transition metal organic compound cobalt gluconate, zinc lactate, diphenol ethylene diamine tungsten compound and precious metal chemical complex dichlorodiamminoplatinum in a hydrothermal reaction kettle under the effect of octadecyl dihydroxyethyl ammonium sulfate used as an emulsifier; drying and dewatering the reaction product; and burning in a muffle furnace under a certain temperature, thereby acquiring the solid catalyst for ozone heterogeneous oxidization.
Owner:SICHUAN NORMAL UNIVERSITY
Who we serve
- R&D Engineer
- R&D Manager
- IP Professional
Why Patsnap Eureka
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com