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226results about How to "There are few types of use" patented technology
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High-temperature resisting adhesive and preparation method thereof
InactiveCN102220102AConvenient sourceLow costNon-macromolecular adhesive additivesEpoxy resin adhesivesEpoxyOrganic solvent
The invention relates to a high-temperature resisting adhesive and a preparation method thereof; the adhesive is formed by the following ingredients: carboxyl contained polyimide resin powder, epoxide resin, curing agent and organic solvent with weight ratio of 1:10-20:0.1-2:20-30. The preparation method of the high-temperature resisting adhesive comprises the following steps: adding the carboxylcontained polyimide resin powder, the epoxide resin and the curing agent into a reaction kettle, heating the reaction kettle to 80-90 DEG C for carrying out stirring reaction for 0.5-1.5 hours, and then adding the organic solvent continuously, and stirring the mixture uniformly at room temperature, thus obtaining the high-temperature resisting adhesive. The preparation method has simple process and low cost and is environment-friendly, the preparation process can be carried out in a general device, thereby being suitable for industrial production.
Owner:DONGHUA UNIV +1
Alicyclic-containing polyimide film and preparation method thereof
InactiveCN101580637AConvenient sourceLow costTelescopesNon-linear opticsOptical communicationPhotochemistry
The invention relates to an alicyclic-containing polyimide film. The molecular structure general formula of the film is the right formula, wherein, -CA- is a bivalence connection group of an alicyclic dibasic primary amine, -Ar- is a bivalence connection group of an aromatic dibasic primary amine, and -R- is a bivalence connection group of an aromatic dibasic estolide. The preparation thereof includes: the alicyclic dibasic primary amine and the aromatic dibasic primary amine are dissolved in non-proton organic solvent with strong polarity, the aromatic dibasic estolide is added, the non-proton organic solvent with strong polarity is used for regulating the viscosity of the alicyclic-containing polyamic acid resin solution after reaction for 1-3 hours, forming is carried out in a curtain coating machine, and dehydration fever imidization, cooling and demoulding are carried out so as to obtain the film. The preparation method has mild reaction condition and low cost and is environmentally friendly; and meanwhile, the alicyclic-containing polyimide film has excellent mechanic property and heat resistant property and low water absorption, and the visible light transmission thereof is as high as more than 97%. The film has good application prospect in the fields of optical waveguide material, photorefractive material and photoelectric material in optical communication field and direct action membrane material in the liquid crystal display field and the like.
Owner:DONGHUA UNIV
Full aromatic fluorine containing transparent polyimide film and preparation method thereof
The invention relates to a full aromatic fluorine containing transparent polyimide film. Structural formula of molecule thereof is shown above, wherein -R1 is a divalent residue of fluorine containing aromatic binary primary amine, and -R2 is a divalent connecting group of aromatic binary anhydride molecule. The preparation method thereof comprises steps of adding the fluorine containing aromatic binary primary amine and strongly polar non-protonic organic solvent into a polymerizing bottle, stirring at room temperature, after being completely dissolved, adding the aromatic binary anhydride, stirring, after 3 hours reaction, obtaining transparent and thick fluorine containing aromatic polyamide acid resin solution having homogeneous phase; and using the strongly polar non-protonic organic solvent to regulate viscosity of the fluorine containing aromatic polyamide acid resin solution, forming film, heating, carrying out dehydrating hot-imidization reaction, cooling, demoulding, thus obtaining the full aromatic fluorine containing transparent polyimide film. The preparation method has mild reaction condition, simple operation and low cost and is environment friendly. The full aromatic fluorine containing transparent polyimide film has excellent mechanical property and heat tolerance and visible light transmission thereof is up to 95%.
Owner:DONGHUA UNIV
Polyimide film with high visible light permeability and preparation thereof
The invention related to a polyimide film with high visible light permeability, molecular structure formula of which is: (shown in figure). Preparation comprises steps of: dissolving primary diamine in a strongly polarnon-proton solvent, cooling the same by cold water to 5 DEG. C to 10 DEG. C, adding aromatic dianhydride, mixing, reacting 4h to 10h at 5 DEG. C to 10 DEG. C, acquiring homogeneous, transparent, sticky polyamic acid resin solution; wherein mol number of aromatic dianhydride is equal to that of primary diamine; adjusting viscosity of polyamic acid resin solution by N,N-dimethyl acetamide, forming film in a casting machine, heating to raise temperature, processing dehydration heat imidization, cooling, deciduating to acquire homogeneous and transparent polyimide thin film. The preparation method has mild reaction condition, sample to operate, low in cost and environmental friendly; mechanical property and thermal stability of the polyimide thin film are excellent with high visible light permeability reaching 94% and film thickness 50 micrometers.
Owner:DONGHUA UNIV +1
Colorless transparent aromatic polyimide film and preparation method thereof
The invention discloses a colorless and transparent aromatic polyimide film which has the general formula of molecular structure as follows; the preparation thereof includes: aromatic primary amine and aromatic acid anhydride with specific molecular structures are adopted for polymerization in a strong polar aprotic organic solvent system within the temperature range of 0 DEG C to 35 DEG C to prepare a colorless and transparent viscous polyamide acid solution with homogeneous phase. Viscosity adjustment, casting for forming the film, heating for rising temperature and solvent removal are carried out simultaneously when partial imidization reaction is carried out, and then demoulding and stretching, further deep thermal imidization and rolling are carried out to obtain the colorless and transparent aromatic polyimide film. No special production equipment is required by the invention so that production can be carried out on the conventional production line of the polyimide film and the polyimide film is applicable to industrialized production.
Owner:DONGHUA UNIV +3
Thermoplastic fluorine-containing fully aromatic polyimide powder and preparation method thereof
The invention relates to thermoplastic fluorine-containing fully aromatic polyimide powder, which has a general molecular structural formula shown above, wherein -R1 is a divalent linking group of fluorine-containing aromatic primary diamine; and -R2 is a divalent linking group of a molecule of aromatic acid dianhydride. The method comprises the following steps: reacting the fluorine-containing aromatic primary diamine with the aromatic acid dianhydride in a phenol solvent in the presence of a catalyst for 5 to 10 hours; pouring the hot solution in a precipitator with high-speed stirring to precipitate solid powder; and obtaining the thermoplastic fluorine-containing fully aromatic polyimide powder after filtration, washing, soaking, filtration and drying. The thermoplastic fluorine-containing fully aromatic polyimide powder has good solubility, is a high-performance heat-resistance toughness modifier for epoxy resin, unsaturated polyimide resin, unsaturated polyester resin and other thermosetting resins, and is good in application prospect, simple in operation, low in cost, environmentally-friendly, and suitable for industrial production.
Owner:DONGHUA UNIV
Method for preparing 1,4-di(2,4-diaminophenoxy)benzenoid form self-plasticizing unsaturated polyimides powder
The invention discloses a method for making 1, 4-double (2,4-diamino phenoxy) phenyl type self-toughening unsaturated polyimide powder. The method mainly comprises the following steps that: 1) 1, 4-double (2,4-diamino phenoxy) phenyl, aromatic series binary primary amine and aromatic series binary anhydride as well as an organic compound containing unsaturated double bond are stirred and react in a strong polar aprotic organic solvent system at a temperature of between 20 and 140 DEG C to obtain a brown and ropy thermoset polyamide acid solution capable of cross bonding and curing; 2) the obtained polyamide acid solution is dehydrated, mild-aminated, powdered, filtered, washed and dried to obtain the 1,4-double (2,4-diamino phenoxy) phenyl type self- toughening unsaturated polyimide powder.
Owner:DONGHUA UNIV +1
Dabigatran compound and preparation method and medicinal composition thereof
ActiveCN102391250AGood for production and storageThere are few types of useOrganic active ingredientsOrganic chemistryBenzimidazoleCarbonyl group
The invention discloses a dabigatran compound and a preparation method and a medicinal composition thereof. The dabigatran compound is mesylate-hydrate of 3-[(2-{[4-(carbethoxyl amino-imino-methyl)-phenyl amino]-methyl}-1-methyl-1H-benzimidazole-5-carbonyl)-pyridine-2-radical-amino-ethyl propionate. The invention further relates to a preparation method of the compound and a medicinal composition taking the compound as an active ingredient. Compared with dabigatran mesylate, the compound has higher stability and is more suitable for preparing, storing and using medicinal preparations of various forms.
Owner:CSPC OUYI PHARM CO LTD +1
Preparation method of high-temperature resistant polyimide glass fabric laminated board
The invention relates to a preparation method of a high-temperature resistant polyimide glass fabric laminated board, which comprises the following steps: (1) adding 1,4-bis(2,4-diaminophenoxy) benzene and maleic anhydride to a non-proton organic solvent with strong polarity, then adding aromatic diamine monomer, aromatic dibasic anhydride and initiator, and stirring for dissolving to obtain a component A; (2) adding 1,4-bis(2,4-diaminophenoxy) benzene and maleic anhydride to a non-proton organic solvent with strong polarity, stirring and reacting for 2 hours to obtain a component B; and (3) mixing the component A and the component B evenly to obtain a polyimide precursor resin solution, impregnating the glass fabric in the resin solution, and obtaining the high-temperature resistant polyimide glass fabric laminated board after preliminary drying semi-curing and high-temperature press thermo-curing. The high-temperature resistant polyimide glass fabric laminated board prepared in the invention has excellent heat resistance, can be applied to high-temperature resistant electro-insulating material and high-temperature resistant structural part material of aerospace vehicles, and has wide application prospects.
Owner:DONGHUA UNIV +1
High-efficient water-based well drilling fluid with fast absorption, strong inhibition and low damage
ActiveCN101717624AEnhanced inhibitory effectImprove rheologyDrilling compositionWater basedInorganic salts
The invention discloses a high-efficient water-based well drilling fluid with fast absorption, strong inhibition and low damage, which comprises the following components: 100 parts of seawater or fresh water, 2-5 parts of inorganic salt, 0.2-0.8 part of coating inhibitor, 1.5-3.5 parts of fluid loss additive, 2-4 parts of strong inhibitor, 2-4 parts of lubricant, 0.1-0.5 part of shear strength improving agent and 30-150 parts of weighting agent. The well drilling fluid has strong inhibition and has good rheological property and stable system performance during the whole well drilling process,even a large quantity of highly easily hydrated and dispersed cuttings exist for invasion of sewage, the viscosity of the well drilling fluid is basically controlled to be about 50s.
Owner:CHINA NAT OFFSHORE OIL CORP +1
Fluorine-containing imine matrix resin used for advanced composite material and preparation method thereof
The invention relates to a fluorine-containing imine matrix resin used for advanced composite material, which comprises the following components: 1wt%-15wt% of fluorine-containing polyimide low polymer powder, 5wt%-20wt% of fluorine-containing active polyimide powder, 60wt%-70wt% of multifunctional epoxy resin and 5wt%-20wt% of curing agent; the preparation method comprises the steps of feeding fluorine-containing diamine monomer, fluorine-free diamine monomer and strong-polar aprotic organic solvent, adding aromatic dianhydride solid powder, stirring and reacting at room temperature, adding a dehydrating agent and a catalyst, heating and reacting for 3 hours, adding a precipitant to precipitate out solid powder, cooling to room temperature, filtering, washing and drying, thus obtaining the fluorine-containing polyimide low polymer powder; preparing the fluorine-containing active polyimide powder in a same way; leading the two materials and the multifunctional epoxy resin to conduct bulk polymerization reaction, and then adding the curing agent after dissolution. The method has simple process, low cost and environmental protection effect, can finish the preparation process in standard equipment, and is applicable to industrial production.
Owner:DONGHUA UNIV
Flotation method for lead and zinc sulfide ores
The invention discloses a flotation method for lead and zinc sulfide ores. The method comprises the following steps of: crushing the lead and zinc sulfide ores through a crushing process in three sections of closed route; grinding the ores through two sections of closed route, wherein powder with the ore grinding granularity of -200 meshes is up to 80 to 90 percent; after grinding the ores, adding a catching agent, an inhibitor, a foaming agent and a pH regulator to perform differential flotation on lead, wherein lead concentrate is obtained by performing rough concentration for one time, scavenging for one time and fine concentration for three times on the ores; and putting the tailings obtained after lead scavenging into an electrolyte tank to perform flotation on zinc through an electrolytic method to obtain zinc concentrate. Because the electrolytic method is adopted to separate minerals in the method, the using amount of medicinal agents is reduced, the cost is reduced, the pollution to environment is reduced, and the extraction rate is increased.
Owner:KUNMING UNIV OF SCI & TECH
Method for preparing 2,2-di[3-amino-4-(2,4-dinitrophenoxy)phenyl]hexafluoropropane
InactiveCN101234991AHigh yieldHigh purityOrganic compound preparationChemical recyclingBenzeneOrganic solvent
The invention relates to a preparation method of 2, 2-bis-[3-amino-4-(2, 4-dinitrophenoxy) phenyl] hexafluoropropane, comprising: (1) heating to reflux and segregate water for 6-18h to treat 2, 2-bis-(3-amino-4-hydroxy phenyl and 2, 4-dinitro halogenated benzene at a mol ratio of 1.0:2.0 to 2.2, in a system of salt forming agent and organic solvent, (2) concentrating reaction liquid, cooling the reactant system, adding water, precipitating solid product, filtering, washing and drying to obtain 2, 2-bis-[3-amino-4-(2, 4-dinitrophenoxy) phenyl] hexafluoropropane crystal. The preparation method of 2, 2-bis-[3-amino-4-(2, 4-dinitrophenoxy) phenyl] hexafluoropropane has simple operation, high yield and purity, wherein the solvent can be recovered easily and repeatedly used. The invention has low generation of three wastes and environment-friendly property, which is suitable for industrial production.
![Method for preparing 2,2-di[3-amino-4-(2,4-dinitrophenoxy)phenyl]hexafluoropropane](https://images-eureka.patsnap.com/patent_img/3025bcd5-2ece-4723-b4df-363dad4f0344/s2008100338436e00011.PNG "Method for preparing 2,2-di[3-amino-4-(2,4-dinitrophenoxy)phenyl]hexafluoropropane")
![Method for preparing 2,2-di[3-amino-4-(2,4-dinitrophenoxy)phenyl]hexafluoropropane](https://images-eureka.patsnap.com/patent_img/3025bcd5-2ece-4723-b4df-363dad4f0344/s2008100338436d00011.PNG "Method for preparing 2,2-di[3-amino-4-(2,4-dinitrophenoxy)phenyl]hexafluoropropane")
Owner:DONGHUA UNIV
Wheat field weeding composition and medicine preparation thereof
InactiveCN104145982ADelay drug resistanceReduce pollutionBiocideAnimal repellantsClodinafop-propargylFlucarbazone
The invention belongs to the technical field of agricultural pharmacology and discloses a wheat field weeding composition and a medicine preparation thereof. The wheat field weeding composition is composed of a component 1 and a component 2, wherein the component 1 is halauxifen-methyl and the component 2 is selected from flucarbazone, mesosulfuron, fenoxaprop-P-ethyl, clodinafop-propargyl, pinoxaden or isoproturon. In the wheat field weeding composition, the two components are compounded with each other so that a synergistic effect is achieved. Medicine effects are significantly improved. The wheat field weeding composition can effectively prevent and treat weeds in a wheat field and can be widely applied in the field of agriculture.
Owner:LIANBAO CROP TECH
Polyimide coating with high-temperature resistance and preparation method thereof
InactiveCN102220085AMolecular weight controllableMolecular structure adjustmentCoatingsDiphenylmethaneOrganic solvent
The invention relates to a polyimide coating with high-temperature resistance and a preparation method thereof. The polyimide coating is prepared from the following raw materials: a reactable polyimide resin solution, N,N,N',N'-tetraglycidyl-4,4'-diamino-3,3'-dimethyl diphenylmethane, dicyandiamide, nanoscale inorganic powder and an organic solvent. The preparation method comprises the following steps: mixing the first four components, heating the mixture to 80 DEG C, stirring to react for 0.5-1 hour, adding the organic solvent and uniformly stirring to obtain the polyimide coating. In the invention, the raw material resin has easily controlled molecular weight and easily adjusted molecular structure, thus favoring the preparation of the high-temperature-resistant polyimide coating with ideal performance; the preparation method has moderate reaction conditions, is performed under normal pressure and is simple to operate; and the preparation method has convenient raw material sources and low cost and is suitable for industrial production.
Owner:DONGHUA UNIV +1
Fan control method based on NUMA computer system structure
InactiveCN103603820AThere are few types of useReduce constructionPump controlNon-positive displacement fluid enginesSystem structureArchitecture of Integrated Information Systems
The invention provides a fan control method based on the NUMA computer system structure. In computer systems using an FPGA device, such as physical layer multi-partition computers, an NIOS II soft core is established in the FPGA to monitor server system temperature and control and manage operation of a fan cooling system. A custom PWM module IP core is further provided. The functions such as temperature function, a PWM fan control module, a fan speed detection module, DDR2 SDRAM storage control and Flash storage control are integrated in the NIOS II soft core of the FPGA. Compared to the fan control method based on the NUMA computer system structure is flexible to use, well extensible, highly practical, and easy to popularize.
Owner:LANGCHAO ELECTRONIC INFORMATION IND CO LTD
High temperature resistant composite matrix resin and preparation method thereof
The invention relates to a high temperature resistant composite matrix resin and a preparation method thereof. The high temperature resistant composite matrix resin comprises the following components: maleimide-based polyimide powder, diallyl compounds and bismaleimide resin powder. The preparation method of the high temperature resistant composite matrix resin comprises the following steps: mixing 1,4-bis(2,4-diaminophenoxy) benzene with strong polar aprotic organic solvent and adding raw materials such as maleic anhydride, and the like to prepare a resin solution; then adding a dehydrant, a catalyst and a precipitation agent and stirring the mixture to carry out reaction to separate solid powder; and placing the maleimide-based polyimide powder, the diallyl compounds and the bismaleimide resin powder into a reaction kettle to carry out melt polymerization reaction and dissolving the mixture in the organic solvent. The high temperature resistant composite matrix resin can be applied to glass-fiber reinforced composite materials and high-performance fiber-reinforced advanced composite materials such as carbon fiber, aramid fiber, and the like, and has simple process, low cost and no environment pollution, and can be prepared in general equipment, thereby being suitable for industrial production.
Owner:DONGHUA UNIV
Polyimide carbon fiber sizing agent and method for producing the same
The invention relates to a polyimide carbon fiber tackifier with the molecular general formula shown at the right part. The preparation method of the tackifier comprises the steps as follows: quaternary primary aromatic amines and single anhydride are dissolved in strong-polarity aprotic organic solvent by the molar ratio of 1:2, mixed for reaction for 0.5-2 hours at the temperature of 0-20 DEG C; subsequently, binary primary aromatic amines and 2, 2-bi (3-amido-4-(4-cyano phenoxy) phenyl) Hexafluoropropane are added, mixed, dissolved and cooled by icy water bath; subsequently, binary aromatic anhydride is added and mixed for reaction for 2-4 hours at the temperature of 0-20 DEG C; subsequently, acidic catalyst and entrainer are added; after the heating refluxing water-diversion reaction for 5-12 hours, the entrainer is collected for recovery and reusing and transparent and sticky polyimide solution with uniform phase is obtained; the polyimide carbon fiber tackifier has excellent dimension stability, mechanic property and heat resistance; furthermore, the reaction condition of the preparation method is moderate, the reaction raw material has convenient source and low cost and is friendly to the environment.
Owner:DONGHUA UNIV +1
Organic light emitting diode device, display panel and display device
ActiveCN104701459AImprove efficiencyReduce the driving voltageSolid-state devicesSemiconductor/solid-state device manufacturingDisplay deviceLight-emitting diode
The invention discloses an organic light emitting diode device, a display panel and a display device. The organic light emitting diode device is mainly characterized in that existing serial top-emitting OLED devices are improved, a homojunction structure is utilized and functional layers of the top-emitting OLED devices connected in series are improved, so that each function layer comprises a hole injection layer, a hole transmission layer, a hole side light-emitting layer, an electron injection layer, an electron transmission layer, an electron side light-emitting layer and at least one group of charge producing layers a and charge producing layers b located between the hole side light-emitting layer and the electron side light-emitting layer, the hole injection layer, the hole transmission layer and the hole side light-emitting layer are sequentially arranged on the side close to an anode, the electron injection layer, the electron transmission layer and the electron side light-emitting layer are sequentially arranged on the side close to a cathode. A first light-emitting unit ...and an Nth light-emitting unit of each serial top-emitting OLED device are of homojunction structures, the using categories of organic materials are decreased, injection potential barriers of charge carriers in the devices are eliminated, the charge carrier injection efficiency and the efficiency of the devices are improved, and drive voltage of the devices is reduced.
Owner:BOE TECH GRP CO LTD
High-temperature endurable active toughener powder used for epoxy resin and preparation method thereof
The invention relates to a high-temperature endurable active toughener powder used for epoxy resin, which comprises a general molecular structural formula as right, wherein -R1- is the diatomic linking group of aromatic series binary primary amine containing phenolic hydroxyl groups and -R2- is the diatomic linking group of aromatic series binary estolide molecule. The preparation method thereof comprises the steps of mixing the aromatic series binary primary amine, 2,2-Bis[4-(4-aminophenoxy)phenyl]propane and the aromatic series binary estolide with the mol ratio ranging from 1:1-5:2-6 in phenol solvent to react with each other at a temperature ranging from 100 to 150 DEG C for 5 hours and then pouring the obtained products into a precipitator stirred at a high speed to precipitate solid powder which is then filtered, washed, marinated, filtered and dried for preparing the high-temperature endurable active toughener powder for epoxy resin. The preparation method has the advantages of simple process and low cost, is environmental friendly, can finish the preparation process in universal equipment, and is applicable to industrial production.
Owner:DONGHUA UNIV
Sample pretreatment method for detecting special nitrosamine in tobacco and tobacco products by LC-MS/MS (liquid chromatogram-mass spectrum/mass spectrum)
ActiveCN103954710AReduce consumptionHigh pre-treatment extraction efficiencyComponent separationCentrifugationNitrosamine
The invention discloses a sample pretreatment method for detecting special nitrosamine in tobacco and tobacco products by LC-MS / MS (liquid chromatogram-mass spectrum / mass spectrum). The sample pretreatment method comprises the following steps of: (1) preparing ammonium acetate buffering solution; (2) drying and crushing the tobacco and tobacco products; (3) adding the ammonium acetate buffering solution in the crushed sample, and ultrasonically extracting; (4) carrying out high-speed centrifugation on the extracted sample at room temperature to obtain a first supernatant; (5) adding ethyl acetate in the first supernatant and carrying out extraction and purification, and then centrifuging to obtain a second supernatant; (6) taking the second supernatant, blow-drying by nitrogen and redissolving by deionized water to prepare sample to be detected; and (7) detecting tobacco special nitrosamine in the sample to be detected by virtue of LC-MS / MS. The sample pretreatment method disclosed by the invention has the advantages that the sample pretreatment method is simple and practicable; the tobacco special nitrosamine is dissolved out by the ammonium acetate buffering solution, and purified by the extraction of ethyl acetate solution, and proteins and interference substances are removed to obtain refined sample solution after impurity removal, thus the sample detection is high in accuracy, high in extraction efficiency, simple and convenient to operate, time-saving, and low in reagent consumption.
Owner:ZHENGZHOU TOBACCO RES INST OF CNTC
Polyimide paint for optical fiber and preparation method thereof
The invention relates to a polyimide paint for an optical fiber and a preparation method thereof. The paint comprises, by weight, maleimide polyimide, bimaleimide and polysiloxane imide containing phenolic hydroxyl group in a mass ratio of 1:0.1-0.2:0.5-2.0, and the balance of organic solvent; and a solid content of the paint is 10-30%. The preparation method comprises steps of: respectively preparing maleimide polyimide and polysiloxane imide containing phenolic hydroxyl group; and copolymerizing the two with bimaleimide. The raw material resins employed by the invention have easily controllable molecular weight and easily adjustable molecular structure, and are in favor of preparing polyimide paint for optical fiber, with ideal performances; and the method has advantages of simple process, low cost, environment-friendliness, a preparation process completed in a universal device, and suits for industrial production.
Owner:DONGHUA UNIV +1
Industrial production method of Alogliptin benzoate raw material medicine
InactiveCN104803976AShorten production timeReduce production energy consumptionOrganic chemistryBiotechnologyBenzoic acid
The invention discloses an industrial production method of Alogliptin benzoate raw material medicine. According to the method, ethanol / water mixed solvents are used as crystallization solvents; the ethanol / water mixed solvents and Alogliptin benzoate crude products are heated and flow back to a state that the solution is clear; the temperature is lowered, and crystal seeds are added; the gradient temperature reduction crystal separation is carried out; centrifugation and drying are carried out, and the Alogliptin benzoate raw material medicine is obtained. The adopted mixed solvents have low toxicity, and a better environment-friendly effect can be achieved. Compared with the method in the prior art, the industrial production method provided by the invention has the advantages that the solvent use type is reduced, the process is simple, the yield is high, and the production cost is reduced; through the method, the purity of the obtained Alogliptin benzoate finished product is at least 99.8 percent, the single impurity content is lower than or equal to 0.05 percent, the ethanol residue is low (lower than or equal to 0.1 percent) and is much lower than the limit of 0.5 percent of medical raw material medicine; impurities X generated by the reaction between phthalic acid and Alogliptin can be removed.
Owner:SUZHOU YABAO PHARMA R&D CO LTD
Air conditioner and refrigerant leakage detection method and device of air conditioner
ActiveCN110173814AAvoid the risk of not being able to effectively detect whether the refrigerant is leakingThere are few types of useMechanical apparatusSpace heating and ventilation safety systemsEngineering
The invention discloses an air conditioner and a refrigerant leakage detection method and device of the air conditioner. The method comprises the following steps that a first concentration of gas in air is obtained; and according to the first concentration of the gas, the refrigerant leakage of the air conditioner is identified. According to the refrigerant leakage detection method of the air conditioner, the use type of a sensor is reduced, and the detection cost is reduced; and meanwhile, the risk that refrigerant leakage cannot be effectively detected due to the fact that the refrigerant sensor is used by mistake is avoided, and simpleness and easy realization are achieved.
Owner:GD MIDEA AIR-CONDITIONING EQUIP CO LTD +2
GC-MS (gas chromatography-mass spectrometer) targeted tobacco sample sterol extraction method
The invention discloses a GC-MS (gas chromatography-mass spectrometer) targeted tobacco sample sterol extraction method. The method comprises the following process steps: (1) freeze-drying a tobacco sample, and grinding the tobacco sample through a grinder; (2) adding 1.5ml of normal hexane in 50mg of ground tobacco sample, and performing ultrasonic extraction; (3) extracting the sample, performing high-speed centrifugation at room temperature, transferring a supernatant into a chromatographic bottle, and blow-drying with nitrogen to obtain a solution I; (4) adding 1.2ml of 80% methanol and 20% KOH solution into a precipitate; (5) performing high-speed centrifugation, transferring a supernatant into the chromatographic bottle, adding 1.0ml of normal hexane, and performing vibration and standing; (6) extracting a supernatant, adding 1.0ml of saturated NaCl, taking a supernatant as a solution II, combining the solution I and the solution II, blow-drying with nitrogen, and adding 0.5ml of chloroform for dissolution to obtain a tobacco sample sterol sampling analysis solution specially suitable for GC-MS measurement. The method has the advantages that the extraction method is optimally suitable for tobacco leaf sterol; the use amount of the sample is small and is only 50mg; few types of organic solvents are used, the use amount of the organic solvents is low, and the organic solvents are relatively cheap and small in toxicity; the extraction time is short, and the sample reproducibility is good.
Owner:ZHENGZHOU TOBACCO RES INST OF CNTC
Culture solution and method for inducing mesenchymal stem cells to differentiate into glomerular mesangial cells
InactiveCN103382458AFunction increaseThere are few types of useArtificial cell constructsSkeletal/connective tissue cellsZona glomerulosaCulture fluid
The invention discloses culture solution for inducing mesenchymal stem cells to differentiate into glomerular mesangial cells and an inducing method. The culture solution comprises a human platelet-derived growth factor-BB, all-trans-retinoic acid, collagen-IV and a basic medium, wherein the basic medium is a low-sugar DMEM (Dulbecco's modified eagle medium) containing 2% of horse serum and 5ng / ml of bFGF (basic fibroblast growth factor). The inducing method includes the steps: preparing the inducing culture solution; preparing the mesenchymal stem cells; coating a culture plate by the collagen-IV with the concentration of 5ug / cm<2>; inoculating the mesenchymal stem cells with the cell density of 5*103 / cm<2> into the coated culture plate and adding the inducing culture solution; changing the solution once every three days and performing inducing culture for seven days. The mesenchymal stem cells are jointly induced to differentiate into the glomerular mesangial cells by the aid of the human platelet-derived growth factor-BB, the all-trans-retinoic acid and the collagen-IV, inducing period is short, inducing efficiency is high, the glomerular mesangial cells formed by differentiation are high in functional activity, and transplantation therapy of kidney diseases such as kidney failure is facilitated.
Owner:HARBIN YIJIAYI REGENERATIVE MEDICINE TECH
Aplanatic lighted three-lens projecting display
InactiveCN1403846AThere are few types of useAvoid uneven illuminationPicture reproducers using projection devicesOptical elementsCamera lensIlluminance
The aplanatic lighted three-lens projecting display has two spectroscopes and at least one reflector to separate the incident white light into three color light beams and after the three color light beams are made to pass through separate aplanatic paths, they are projected to three light valves with output lens for image composition separately for regulation. Without using extending lens, the present invention has less variety of assemblies, and thus has relatively easy design and short development period.
Owner:普基亚光电股份有限公司
Polyimide fiber spinning solution based on 2, 2-double [4-(2, 4-diaminophenoxy) phenyl group] hexafluoropropane and preparation method thereof
InactiveCN102644128AMolecular weight easySimple molecular structureMonocomponent synthetic polymer artificial filamentPhenyl groupCarboxylic group
The invention relates to a polyimide fiber spinning solution based on 2, 2-double [4-(2, 4-diaminophenoxy) phenyl group] hexafluoropropane and a preparation method thereof. The structural formula of components of the spinning solution is shown as below. The preparation method includes adding the 2, 2-double [4-(2, 4-diaminophenoxy) phenyl group] hexafluoropropane and a high-polar aprotic organic solvent into a reaction kettle, stirring for dissolution at the room temperature, adding phthalic anhydride, stirring for reaction for half an hour, cooling until the temperature is under 5 DEG C through an ice-water bath, adding 3, 3', 4, 4'-tetracarboxy benzophenone dianhydride, stirring for reaction for half an hour, adding pyromellitic dianhydride, maintaining the reaction temperature under 5 DEG C, and obtaining the solution after stirring for reaction for 2-4 hours. The polyimide fiber spinning solution based on the 2, 2-double [4-(2, 4-diaminophenoxy) phenyl group] hexafluoropropane and the preparation method thereof have the advantages that molecular weight of resin is easy to control, molecular structure is easy to regulate, preparation of high-performance polyimide fibers is facilitated, reaction condition of the preparation method is mild, and industrialization of products is facilitated.
Owner:DONGHUA UNIV +1
High-temperature resistant benzimidazole optical fiber coating and preparation method of coating
The invention relates to a high-temperature resistant benzimidazole optical fiber coating and a preparation method of the coating. The coating comprises polyamic acid containing active vinyl, polybenzimidazole amic acid and high-polarity aprotic organic solvent. The preparation method comprises the following steps of dissolving benzimidazole diamine, diamine containing phenolic hydroxyl, and other aromatic diamine in the high-polarity aprotic organic solvent, cooling to 0 DEG C to 5 DEG C, adding aromatic diaanhydrid monomer, stirring and reacting for 5 to 10 hours, obtaining the polybenzimidazole amic acid solution, adding the polyamic acid solution containing the active ethenyl, stirring and uniformly mixing, and obtaining the high-temperature resistant benzimidazole optical fiber coating. The coating is simple in solidification process, good in high temperature resistance, and excellent in mechanical property and electrical property. The preparation method is simple, the reaction condition is mild, the process is easy to control, the preparation of the optical fiber coating with ideal performances is facilitated, and the industrialization prospect is good.
Owner:DONGHUA UNIV +1
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