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55results about How to "The synthesis process is stable" patented technology
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New method for synthesizing Ramosetron Hydrochloride
InactiveCN1696128APrecise control methodEasy to prepareOrganic chemistryOrganic chemistryRamosetron hydrochloride
Owner:天津康鸿医药科技发展有限公司
FeMnNi powder accelerant with low cost and preparation method and application
InactiveCN103170347ALow costMany holesDiamondMetal/metal-oxides/metal-hydroxide catalystsNitrogenGraphite
The invention relates to a FeMnNi powder accelerant with low cost, wherein the alloy comprises the components in percentage by weight as follows: 30-50% of Mn, 0-10% of Ni, 1-3% of Cr, 0.1-0.8% of C, 0.05-0.2% of Si and the balance of Fe. The oxygen content of a powder accelerant product optimized is less than or equal to 300ppm, and the nitrogen content is less than or equal to 180ppm. The accelerant is prepared by a gas atomization process of inertial gas, so that the accelerant powder is spherical or approximately spherical with uniform alloy composition. Diamond synthesized by the accelerant and graphite in proportion is greyish-green or dark green in color, and the crystal form of the diamond is a polygonal aggregate in a granular structure. The per mixed unit yield reaches over 154 carat / block by cavity with diameter of 40mm, the static pressure strength is average about 20N, and the coarsness proportion of 80 / 100 reaches over 60%, so that the accelerant is an ideal raw material for manufacturing an efficient diamond grinding apparatus for crisp and hard materials.
Owner:GRIMAT ENG INST CO LTD
Method for preparing butyl rubber by catalytic polymerization
ActiveCN102140147AThe synthesis process is stableHigh molecular weightPolymer scienceCationic polymerization
The invention relates to a method for preparing butyl rubber by catalytic polymerization. The method comprises the following steps: contacting an isobutene monomer with an isoprene monomer at the temperature of minus 75 DEG C-minus 50 DEG C in the presence of an aliphatic series hydrocarbon diluent and a catalyst composite so as to carry out a cationic polymerization reaction, wherein the amount of added isobutene is 80-85% of the total volume, and the weight of added isoprene is 2.90-2.97% of that of isobutene, the allowance is the aliphatic series hydrocarbon diluent based on volume, the content of aluminium diethyl monochloride in the added catalyst composite is 0.13-0.23% of the mass of isobutene, the addition weight of ethylaluminum dichloride is 8.2% of that of aluminium diethyl monochloride, and the addition mass of water is 10-16% of that of the added diethylaluminum. The catalyst composite is stable in property, and butyl rubber with high dialkene content and molecular weight is formed at the polymerization reaction rate.
Owner:PETROCHINA CO LTD
Method for preparing Nano silver solution
The invention discloses a manufacture method for nanometer silver solution that the main raw materials weight ratio is AgNO3: reducer: cold glue: adjuvant: surface active agent= 0.8-1.2: 0.8-1.2: 0.1-0.5: 1.8-2.2: 2.8-3.2. The producing process includes the following steps: making AgNO3 and reducer solution; mixing cold glue with NaCl or any of sugar according to weight ratio of 1:9-11, putting into high cutting dispersing emulsion machine reaction kettle in ultrasound field, adding water, heating to 50-70 deg.C, rotating speed is 500-700rpm / min, whisking to gain mixture solution A; adding adjuvant and whisking to equal; pumping the solution of AgNO3 and reducer into reaction kettle, increasing rotating speed to 2000-3000rpm / min, continuing whisking for 0.5-24 hours to gain nanometer silver solution that the diameter is 3-60 nanometer. The invention has the advantages of small particle diameter, narrow distribution, high stability, etc.
Owner:昆明汉德纳米生物科技有限责任公司
Synthesis technology of water-emulsion fluorescent pigment
ActiveCN101787100AHigh transparencyThe synthesis process is stableOrganic dyesLuminescent compositionsEmulsionPolymer science
The invention relates to the field of fluorescent pigment, in particular to a synthesis technology of a water-emulsion fluorescent pigment, which mainly comprises an emulsification process, a seed emulsion polymerization process, a dropping reaction process and a post-treatment process; the invention comprises the following steps: firstly preparing emulsified liquid through the emulsification process, getting 5 to 20 percent of the total prepared emulsified liquid to synthesize the seed emulsion, then performing the dropping reaction process and the post-treatment process, so that the stability of the synthesis technology of the integrated water-emulsion fluorescent pigment can be ensured, thereby reducing the viscosity of the product and improving the transparency of resin and fluorescence of the product. Therefore, the water-emulsion fluorescent pigment prepared by the synthesis technology of invention has the advantages of low viscosity and high fluorescence.
Owner:HUANGSHAN JIAJIA FLUORESCENT MATERIAL
Preparing method of edaravone
The invention relates to a preparing method of edaravone, and belongs to the technical field of preparation of heterocyclic compounds. The preparing method of edaravone comprises the steps of carryingout a reaction between phenylhydrazine and ethyl acetoacetate at 25-30 DEG C for 1-4 h in an organic solvent, and then removing the solvent to obtain an oily substance, wherein the mole ratio of phenylhydrazine to ethyl acetoacetate is 1:(1.019-1.080); uniformly mixing the obtained oily substance with acetic acid, carrying out a reflux reaction at 105-115 DEG C for 6-10 h, then removing unreactedacetic acid, then adding an alcohol solvent for uniform mixing, and conducting soil-liquid separation to obtain edaravone. According to the preparing method of edaravone, by controlling the reactioncondition, stepwise reactions are carried out, the reaction process is more easily controlled, the content of impurities in the product is also greatly reduced, particularly, the contents of residualphenylhydrazine and derivative impurities thereof can be reduced, the genotoxicity of the product is greatly lowered, and the safety of using edaravone is improved.
Owner:HENAN RUNHONG PHARMA
Netted gamma-aluminum oxide coated modified graphite negative electrode material as well as preparation method and application thereof
InactiveCN113363445AThe synthesis process is simpleThe synthesis process is stableSecondary cellsNegative electrodesGraphiteBattery cell
The invention relates to the field of negative electrode materials, in particular to a preparation method of a reticular gamma-alumina coated modified graphite negative electrode material. The method comprises the following specific steps: uniformly coating an aluminum salt on the surface of a commercial graphite negative electrode through a sol-gel method; carrying out vacuum drying on the obtained coated precursor; and carrying out high-temperature calcination reaction on the dried product to obtain the reticular gamma-aluminum oxide coated modified graphite material. The invention also provides an application of the netted gamma-alumina coated modified graphite negative electrode. The coated modified graphite material is applied to a lithium ion battery negative electrode. The method is simple in process, mild in condition and low in cost, and the reticular gamma-aluminum oxide coated modified graphite negative electrode material prepared by the method is uniform in surface coating, uniform in particle size distribution, excellent in electrochemical performance, stable in product batch performance and suitable for large-scale industrial production.
Owner:DONGGUAN KAIJIN NEW ENERGY TECH
Melamine modified resin adhesive for flax chip shaving boards, and preparation method thereof
ActiveCN105131223ALow free formaldehyde contentThe synthesis process is stablePolymer scienceSubstituted urea
The invention discloses a melamine modified resin adhesive for flax chip shaving boards, and a preparation method thereof. The resin adhesive comprises, by weight, 1230-1600 parts of formaldehyde, 1050-1300 parts of melamine, 40-80 parts of diglycol, 30-80 parts of caprolactam and 700-1000 parts of water. Melamine is used to substitute urea in order to be used for synthesizing melamine-formaldehyde resin, so the colorless and semitransparent properties of resin are reserved, and the resin adhesive also has the advantages of suitable storage period, controllable cost, improved water and heat resistance, and solidification at normal temperature.
Owner:SHANDONG DOTON HOME DELIVERY FURNITURE
Preparation method of acrylate graft-modification waterborne polyurethane resin
InactiveCN106117451AThe molecular structure is well controlledImprove performanceCoatingsPolyesterCarboxylic acid
The invention discloses a preparation method of acrylate graft-modification waterborne polyurethane resin. The preparation method comprises the following steps of vacuum dewatering polyester polyol Novomer, dropwise adding diisocyanate after nitrogen is introduced, and reacting to obtain a polyurethane prepolymer I; then adding polyhydroxy carboxylic acid into the polyester polyol Novomer, dropwise adding dihydric alcohol monomer, and reacting to obtain a polyurethane prepolymer as shown in the description; dropwise adding acrylic monomer into the polyurethane prepolymer as shown in the description to obtain polyurethane acrylate oligomer; adding organic amine into the polyurethane acrylate oligomer to carry out salt forming reaction, then adding deionized water and emulsifying to obtain the acrylate graft-modification waterborne polyurethane resin. The acrylate graft-modification waterborne polyurethane resin has the advantages that the overall performance of waterborne polyurethane and acrylic acid is taken into consideration, the hardness is high (greater than 3H), the adhesive force is 0 level, the water resistance and the aging resistance are both excellent, the comprehensive performance of waterborne polyurethane synthesized by the polyester polyol Novomer is improved, the cost is reduced, and the cost performance and the competitiveness are improved.
Owner:TONGGUANG JIANGSU INFORMATION TECH CO LTD
Preparation method of high-temperature-resistant and corrosion-resistant fluorine-containing organic silicon/SiO2 nano-hybrided coatings
InactiveCN103122214AReduce the impactImprove corrosion resistanceAnti-corrosive paintsSilicic acidEthylic acid
The invention discloses a preparation method of high-temperature-resistant and corrosion-resistant fluorine-containing organic silicon / SiO2 nano-hybrided coatings, which comprises the following steps: by taking tetraethoxysilane, methylphenyldimethoxysilane and dodecafluoroheptylpropyl methyl dimethoxysilane as precursors, and preparing a fluorine-containing organic silicon / SiO2 hybrided sol by using a sol-gel method. The mole ratios of reaction components are as follows: the mole ratio of tetraethoxysilane, methylphenyldimethoxysilane and dodecafluoroheptylpropyl methyl dimethoxysilane is (0.001-500):(0.001-500):(0.001-200); and the mole ratio of anhydrous ethanol, distilled water, an acetic acid and total Si is (0.001-500):(0-100):(0.0001-50):(0. 01-1000). A coating obtained through curing the sol subjected to film coating has good high temperature resistance, corrosion resistance, hydrophobic properties and mechanical properties.
Owner:NANCHANG HANGKONG UNIVERSITY
Synthesis method of peelable water-based polyurethane resin for car cover
The invention discloses a synthesis method of peelable water-based polyurethane resin for a car cover. The synthesis method comprises the following steps: firstly, adding polytetramethylene ether glycol and polyether-modified organosilicone into a reaction container, performing vacuum dewatering, introducing nitrogen, dropwise adding diisocyanate into the reaction container, and reacting to obtain a prepolymer I; cooling the prepolymer I to 60 DEG C or below, adding dried polyhydroxycarboxylic acid into the reaction container, then dropwise adding dihydric alcohol into the reaction container, and reacting to obtain a hydrophilic group-containing prepolymer II; cooling the prepolymer II to 45 DEG C, dropwise adding diamine into the reaction container, and reacting to obtain a prepolymer III; and adding organic amine into the prepolymer III, neutralizing to form salt, and then adding diamine diluted with deionized water, stirring for 30-60 min, and emulsifying to obtain the peelable water-based polyurethane resin for the car cover, having the solid content of 30-45%. The peelable water-based polyurethane resin for the car cover, prepared by the synthesis method provided by the invention, improves the water resistance and the aging resistance of the car cover on the premise of easy peeling.
Owner:TONGGUANG JIANGSU INFORMATION TECH CO LTD
Method for preparing rare-earth layered hydroxide with self-sacrificing template method
InactiveCN107500336AThe synthesis process is simpleThe synthesis process is stableRare earth metal compoundsNitrateRare earth
The invention discloses a method for preparing a rare-earth layered hydroxide Gd2(OH)4SO4.nH2O with a self-sacrificing template method. The method comprises the following steps: (1) uniformly mixing gadolinium nitrate hexahydrate in deionized water for preparing a gadolinium nitrate (Gd(NO3)3) solution with the Gd<3+> concentration of 0.03-0.20mol / L; (2) regulating the pH value of the solution to be 6.5-8.5, continuously stirring to obtain uniform turbid liquid, and reacting to obtain a product; (3) aging the product to room temperature, performing centrifugal separation, and drying to obtain self-sacrificing template phase Gd2(OH)5NO3.nH2O solid powder; (4) uniformly mixing a (NH4)2SO4 solution with the Gd2(OH)5NO3.nH2O solid powder according to certain ratio, and reacting under sealed condition so as to obtain a reaction product; and (5) cooling the reaction product to room temperature, performing centrifugal separation, and drying, thereby obtaining the rare-earth layered hydroxide Gd2(OH)4SO4.nH2O. The preparation method disclosed by the invention is simple, the reaction process is stable, the cost is low, and the product has uniform morphology and excellent dispersion property.
Owner:BOHAI UNIV
Cyanide complex catalyst, and its preparing method and use
InactiveCN1640544AImprove performanceThe synthesis process is stableOrganic-compounds/hydrides/coordination-complexes catalystsKetoneCarboxylic acid
The present invention relates to a cyanide complex compound catalyst, its preparation method and application in polyether. Said catalyst is made up by means of common coordination of three ligands of organics small molecule, functional compound and functional polymer which are introduced into cyanide complex compound. Said organic small molecule ligand is one or several kinds of alcohol, ether, aldehyde, ketone, ester or acidamine, its molecular weight is less than 200; the functional compound is aromatic carboxylic acid ester compound, its molecular weight is less than 500, and the functional polymer is macromolecular compound containing oxygen, nitrogen, phosphorus and sulfur, and its molecular weight is greater than 500.
Owner:LIMING RES INST OF CHEM IND
Preparation method of high-purity butylphthalide
ActiveCN111961018AMild triggering conditionsImprove securityOrganic chemistryBenzoic acidButyl bromide
The invention relates to a preparation method of high-purity butylphthalide. The preparation method comprises the following steps: (1) preparing n-butyl magnesium bromide; (2) synthesizing 2-valerylbenzoic acid; (3) synthesizing butylphthalide; and (4) refining the butylphthalide. Due to the adoption of the technical scheme, the preparation method has the advantages that the n-butyl magnesium bromide is used as an initiator in the step (1), so that the initiation condition is mild, and the safety performance is improved; and the initiation temperature is 38-42 DEG C, and the reaction temperature is only 48-52 DEG C, so that the temperature is easy to implement in the mass production process; the 2-valerylbenzoic acid is used as the raw material, and carbonyl is reduced in a sodium borohydride aqueous solution mode, so that explosion easily caused by a solid feeding mode is avoided, and production safety is guaranteed; and the butylphthalide is refined in a reduced pressure distillationmode, so that the method is simple and easy to implement, and the purity of the obtained high-purity butylphthalide reaches 100%. The synthesis process of butylphthalide is stable, the preparation process is mild and controllable, and the method is suitable for batch production.
Owner:吉林省奇健生物技术有限公司
Immersion type phosphide synthesis and growth device under magnetic field
ActiveCN113512755AOvercoming problems such as regurgitationInhibition of floating ratePolycrystalline material growthBy pulling from meltCruciblePhysical chemistry
The invention discloses an immersion type phosphide synthesis and growth device under a magnetic field, belongs to the field of semiconductor material preparation, and particularly relates to a device for synthesizing and growing a semiconductor phosphide in a mode of immersing phosphorus into a metal melt under the action of a static magnetic field. The device comprises a main furnace body, a crucible in the main furnace body, a heater on the periphery of the crucible and a heat preservation layer, and further comprises an injection synthesis system connected with a driving device, wherein the injection synthesis system bears red phosphorus and sinks into the crucible under the action of a driving device. According to the invention, By adopting the device provided by the invention, red phosphorus sinks into a melt in a solid form and floats upwards from the bottom of a crucible after being gasified, so that the problems of suck-back and the like caused by phosphorus bubbles are solved; and a transverse static magnetic field inhibits the floating speed of bubbles and also inhibits melt convection in the temperature gradient direction, so that the synthesis process is more stable and rapid.
Owner:THE 13TH RES INST OF CHINA ELECTRONICS TECH GRP CORP
Method for induced-growing Epsilon-ferric oxide nano-rod by lead ions
ActiveCN107364898ASynthetic strongMaintain growth-inducing effectNanotechnologyFerric oxidesLead nitrateProcess design
The invention discloses a method for induced-growing an Epsilon-ferric oxide nano-rod by lead ions, and belongs to the technical field of the novel nano permanent magnet material preparation. The method comprises the following steps: mixing lead nitrate, iron nitrate nonahydrate and water, and preparing mixed metal solution; mixing normal octane, cetyl trimethyl ammonium bromide and normal butanol, and preparing suspension liquid; mixing the suspension liquid with ammonium hydroxide and the mixed metal solution, and preparing two types of reversed-phase microemulsion; mixing two types of the reversed-phase microemulsion and executing the first time of the reaction, and adding tetraethoxysilane to execute the second time of the reaction after the first time of the reaction until the ending, to obtain a precursor, heating the precursor to obtain the powder-like Epsilon-ferric oxide nano-rod. The method is a technology method for stably synthesizing the Epsilon-ferric oxide nano-rod within the wider temperature range, is capable of providing the foundation for the synthesis of a lot of the Epsilon-ferric oxide nano permanent magnets, and providing the excellent reference for the synthetic process design of a similar nano metastable state material.
Owner:YANGZHOU UNIV
Polyurethane foam stabilizer and preparation method
The invention provides a polyurethane foam stabilizer and a preparation method. The preparation method comprises the following steps of synthesizing of silicone oil with low hydrogen content, synthesizing of unsaturated polyether, synthesizing of isocyanate-terminated unsaturated polyether, and reacting of the silicone oil with low hydrogen content and the isocyanate-terminated unsaturated polyether, so as to obtain the polyurethane foam stabilizer. The preparation method has the advantages that the unsaturated polyether-terminated polyester uses isocyanate as a end-capping reagent, the usage amount is less, the reaction time is short, the waste salt is not produced, the product quality is stable, and the cost is low; the reaction activity is strong, the property is excellent, the problem of existence of terminating in the existing alkyl terminating and unsaturated polyether is solved, and the variety of the existing polyurethane foam stabilizer is enriched by adjusting the type of the isocyanate end-capping reagent.
Owner:联泓(江苏)新材料研究院有限公司
Tetra-azido alkane and preparation method thereof
The invention discloses a tetra-azido alkane and a preparation method thereof. A structural formula of the tetra-azido alkane is (N3CH2)2CH(CH2)3CH(CH2N3)2. The preparation method comprises the following steps of: under the protection of nitrogen, reacting diethyl malonate and 1,3-dibromopropane at a low temperature to obtain tetracthyl-1,1,5,5-pentanctetracarboxylate; under the protection of the nitrogen, carrying out ice bath at below 5 DEG C, and reacting the tetracthyl-1,1,5,5-pentanctetracarboxylate and a tetrahydroaluminate diethyl ether solution to obtain 2,6-dihydromethyl-1,7-heptandiol; carrying out the ice bath at below 5 DEG C, reacting paratoluensulfonyl chloride and a pyridine solution of the 2,6-dihydromethyl-1,7-heptandiol for 10h, and carrying out chloroform recrystallization to obtain 2,6-p-ditoluenosulfonate methyl-1,7-p-ditoluenosulfonate methyl heptaester; and adding an aqueous solution of sodium azide to a dimethylformamide solution of the 2,6-p-ditoluenosulfonate methyl-1,7-p-ditoluenosulfonate methyl heptaester to react for 15h at 80 DEG C to obtain a 2,6-biazido-1,7-di-azido heptane product.
Owner:XINXIANG UNIV
Q-type high-refractive-index phenyl vinyl silicone oil as well as synthesis method and application thereof
ActiveCN113321810AHigh light transmittanceIncrease crosslink densityAdhesivesPolymer scienceAdhesive
The invention discloses Q-type high-refractive-index phenyl vinyl silicone oil as well as a synthesis method and application thereof. The silicone oil has a chemical structural expression as shown in a formula described in the specification. The Q-type high-refractive-index phenyl vinyl silicone oil prepared by the invention is used for preparing an LED packaging adhesive, and the cured LED packaging adhesive has relatively high refractive index and light transmittance; and the cross-linking density is higher than that of a common packaging adhesive, and the packaging adhesive has relatively good anti-aging performance and is suitable for being used in a high-power LED (light-emitting diode) lamp.
Owner:WANHUA CHEM GRP CO LTD
Method for synthesizing aluminum citrate cross-linking agent in low carbon solvent
InactiveCN102898299ANo need to recycleGel-forming stabilityCarboxylic acid salt preparationDrilling compositionChemical reactionSolvent
The invention relates to a method for synthesizing an aluminum citrate cross-linking agent in a low carbon solvent. (1) the weight part proportions of chemical raw materials are as follows: 100-140 parts of methanol, 40-60 parts of ethanol, 40-100 parts of citric acid, 30-60 parts of aluminium chloride hexahydrate, 10-20 parts of sodium hydroxide and 20-30 parts of water. (2) the method comprises the following chemical reaction process steps of: firstly mixing methanol and ethanol according to the proportion under a normal pressure; adding citric acid to the above mixture to make citric acid dissolved completely; adding aluminium chloride hexahydrate under stirring; heating to a temperature of 40-80 DEG C; reacting for 4 hours; dropwise adding a sodium hydroxide solution slowly to adjust a pH value to 5.5-8.5; finally, adding a residual component of water, stirring uniformly, and thus the aluminum citrate cross-linking agent is obtained. The aluminum citrate cross-linking agent synthesized by the method has stable gel-forming properties and controllable gel-forming time, and has no sulfate ions and nitrate ions. The synthetic process is gent and easy to operate, has no generation of industrial waste materials, and is economic and environment-friendly.
Owner:PETROCHINA CO LTD
Phosphate-modified waterborne epoxy ester resin and anti-corrosive primer thereof, and preparation methods of phosphate-modified waterborne epoxy ester resin and anti-corrosive primer
PendingCN114044881AFast dryingHigh glass transition temperatureAnti-corrosive paintsEpoxyPhosphoric Acid Esters
The invention relates to phosphate-modified waterborne epoxy ester resin and an anti-corrosive primer thereof, and preparation methods of the phosphate-modified waterborne epoxy ester resin and the anti-corrosive primer. A scheme provided by the invention comprises the phosphate-modified waterborne epoxy ester resin and the preparation method thereof. The waterborne epoxy ester anti-rust primer with excellent anti-rust performance is prepared by taking the phosphate-modified waterborne epoxy ester resin as a base material and cooperatively using a non-toxic and efficient anti-rust pigment. Compared with the prior art, epoxy resin and phosphoric acid are esterified to synthesize epoxy phosphate, then the epoxy phosphate and acrylate monomers are subjected to graft copolymerization, so the phosphate modified waterborne epoxy ester resin with excellent performance is prepared, and the salt spray resistance of the anti-rust primer is further improved.
Owner:上海华谊涂料有限公司
Woven reinforced degradable polyurethane elastomer artificial blood vessel and preparation method thereof
The invention provides a woven reinforced degradable polyurethane elastomer artificial blood vessel and a preparation method thereof. The inner layer of the artificial blood vessel adopts activated H2N-PEG-COOH, heparin and (Mpa)-GGGGGREDV polypeptide to treat a C-PEEUU-NH2 electrospun nanofiber tubular stent to obtain a C-PEEUU-PEG-Hep / REDV tubular stent, the middle layer adopts a woven reinforced layer of nanofiber yarns woven by dissolving and mixing one or more master batches of PLGA, PDO and PGA according to a mass ratio, and the outer layer is a macroporous layer prepared by thermally induced phase separation. The woven reinforced degradable polyurethane elastomer artificial blood vessel provided by the invention can be used for tissue regeneration and construction of cardiovascularand cerebrovascular diseases, the preparation method is simple and efficient, the price is low, and the prepared artificial blood vessel has resilience, compliance, bursting strength and biocompatibility matched with autologous vascular tissues. The artificial blood vessel has no hypersensitivity to a human body in a transplantation operation, has affinity with blood and peripheral tissues in thehuman body, and has a good application prospect in repair operations of cardiology surgery, nephrology surgery and brain surgery.
Owner:SHANGHAI SIXTH PEOPLES HOSPITAL
The preparation method of tipipenem ester
The invention provides a preparation method of tebipenem pivoxil, and relates to the technical field of pesticide synthesis. The preparation method of the tebipenem pivoxil comprises the following steps that 1-(4,5-dihydro-2-thiazolyl) azetidine-3-thiol hydrochloride and 1 beta-methyl vinyl phosphate are used as raw materials to take a reaction under the existence of diisopropylethylamine, and an acetonitrile water solution is used for washing to obtain an intermediate I; the intermediate I, an n-butyl alcohol water solution, a palladium-carbon catalyst and sodium bicarbonate take a mixed reaction, and treatment is performed to obtain an intermediate II; the intermediate II and chloromethyl pivalate take a reaction through phase transfer catalyst catalysis under the existence of diisopropylethylamine and dimethylformamide to obtain an intermediate III; the intermediate III and a sodium bicarbonate water solution are mixed, ethyl acetate is added, and reaction and refining are performed to prepare the tebipenem pivoxil. The preparation method has the advantages that the purity and the yield of the intermediates are obviously improved; the purity of the final product of the tebipenem pivoxil reaches 99.21 to 99.78 percent; the yield reaches 88.7 to 92.1 percent.
Owner:HENAN QUANYU PHARMA CO LTD
Urea-formaldehyde modified resin adhesive for bagasse shaving boards and preparation method thereof
ActiveCN105038670AIncrease responsivenessThe synthesis process is stableAldehyde/ketone condensation polymer adhesivesDiethylene glycolResin adhesive
The invention discloses a urea-formaldehyde modified resin adhesive for bagasse shaving boards and a preparation method thereof. The urea-formaldehyde modified resin adhesive for bagasse shaving boards is composed of the following components in parts by weight: 3300 parts of formaldehyde, 60 parts of diethylene glycol, 1600 parts of urea, 20 parts of caprolactam, 2 parts of sodium hydroxide and 450 parts of water. On the basis of the traditional urea-formaldehyde resin alkali-acid-alkali synthesis technique, after the early stage extended reaction is performed on the first batch of urea, when the free formaldehyde content in the reaction solution is low, the diethylene glycol with higher reaction is added; in the later reaction stage, the pH value of the reaction solution is strictly controlled, so that the synthesis process is performed in a controllable way; and finally, the second batch of urea is added to capture free formaldehyde and further enhance the reaction degree of the reaction solution. The reaction process is smooth and controllable, and has favorable repeatability.
Owner:SHANDONG DOTON HOME DELIVERY FURNITURE
FeMnNi powder accelerant with low cost and preparation method and application
InactiveCN103170347BLow costMany holesDiamondMetal/metal-oxides/metal-hydroxide catalystsNitrogenGraphite
Owner:GRIMAT ENG INST CO LTD
A kind of synthetic method of organosilicon modified waterborne polyurethane resin
Owner:TONGGUANG JIANGSU INFORMATION TECH CO LTD
A kind of melamine modified resin glue for flax chipboard and its preparation method
ActiveCN105131223BLow free formaldehyde contentThe synthesis process is stableHeat resistanceSubstituted urea
The invention discloses a melamine modified resin adhesive for flax chip shaving boards, and a preparation method thereof. The resin adhesive comprises, by weight, 1230-1600 parts of formaldehyde, 1050-1300 parts of melamine, 40-80 parts of diglycol, 30-80 parts of caprolactam and 700-1000 parts of water. Melamine is used to substitute urea in order to be used for synthesizing melamine-formaldehyde resin, so the colorless and semitransparent properties of resin are reserved, and the resin adhesive also has the advantages of suitable storage period, controllable cost, improved water and heat resistance, and solidification at normal temperature.
Owner:SHANDONG DOTON HOME DELIVERY FURNITURE
Synthesis technology of water-emulsion fluorescent pigment
ActiveCN101787100BHigh transparencyThe synthesis process is stableOrganic dyesLuminescent compositionsEmulsionPolymer science
The invention relates to the field of fluorescent pigment, in particular to a synthesis technology of a water-emulsion fluorescent pigment, which mainly comprises an emulsification process, a seed emulsion polymerization process, a dropping reaction process and a post-treatment process; the invention comprises the following steps: firstly preparing emulsified liquid through the emulsification process, getting 5 to 20 percent of the total prepared emulsified liquid to synthesize the seed emulsion, then performing the dropping reaction process and the post-treatment process, so that the stability of the synthesis technology of the integrated water-emulsion fluorescent pigment can be ensured, thereby reducing the viscosity of the product and improving the transparency of resin and fluorescence of the product. Therefore, the water-emulsion fluorescent pigment prepared by the synthesis technology of invention has the advantages of low viscosity and high fluorescence.
Owner:HUANGSHAN JIAJIA FLUORESCENT MATERIAL
New method for synthesizing Ramosetron Hydrochloride
InactiveCN1315823CPrecise control methodEasy to prepareOrganic chemistryOrganic chemistryRamosetron hydrochloride
Owner:天津康鸿医药科技发展有限公司
Steroidal intermediate chemical as well as preparation method and application thereof
PendingCN113292625AIncrease contentAvoid one-time purificationSteroidsBiochemical engineeringPharmaceutical drug
The invention belongs to the technical field of synthesis of steroidal intermediate chemicals, and particularly discloses a steroidal intermediate chemical and a preparation method and application thereof. The steroidal intermediate chemical can be used for synthesizing plant growth regulators, steroidal drugs and the like, stigmasterol serves as a raw material, and the steroidal intermediate chemical is obtained through three-step reactions of sulfonylation, rearrangement, manganese dioxide selective oxidation. The synthesis process is stable and easy to operate, and conditions are mild and easy to control; raw materials are rich in source and easy to obtain; purification is not needed in the intermediate process, the technological process is simplified, the solvent is easy to recover, and cost is reduced; and meanwhile, sewage and waste discharge is reduced, industrialization is facilitated, and high economic and social benefits can be brought.
Owner:HENAN ACADEMY OF SCI CHEM RES INST CO LTD
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