202 results about "Nitrate ester" patented technology

A pharmaceutical composition comprising a co-crystal of an API and a co-crystal former; wherein the API has at least one functional group selected from ether, thioether, alcohol, thiol, aldehyde, ketone, thioketone, nitrate ester, phosphate ester, thiophosphate ester, ester, thioester, sulfate ester, carboxylic acid, phosphonic acid, phosphinic acid, sulfonic acid, amide, primary amine, secondary amine, ammonia, tertiary amine, sp2 amine, thiocyanate, cyanamide, oxime, nitrile diazo, organohalide, nitro, s-heterocyclic ring, thiophene, n-heterocyclic ring, pyrrole, o-heterocyclic ring, furan, epoxide, peroxide, hydroxamic acid, imidazole, pyridine and the co-crystal former has at least one functional group selected from amine, amide, pyridine, imidazole, indole, pyrrolidine, carbonyl, carboxyl, hydroxyl, phenol, sulfone, sulfonyl, mercapto and methyl thio, such that the API and co-crystal former are capable of co-crystallizing from a solution phase under crystallization conditions.

The invention relates to a nitric acid ester drug for inhibiting the regeneration of blood vessels. The drug is the compound 1, ester or salt of the compound with the following general formula: T-(B-O-NO2)t1, wherein t1 is 1 or 2; T-H is a steroids compound; T is a residual steroids radial of the compound 1 after removing H, and T and H are connected in the form of O-H, namely connecting an oxygen atom on T and H, to form a hydroxide radical The compound is used for preparing the drug for treating tumor and ocular neovascularization disease.

The invention discloses a combustion-restricted layer formula applied to an NEPE (Nitrate Ester Plasticized Polyether) propellant. The combustion-restricted layer formula comprises the following components in percentage by mass: 51-74 percent of adhesive, 9-12 percent of a curing agent, 8-22 percent of reinforcing filler, 3-5 percent of an anti-aging agent, 5-8 percent of a network regulator and 1-2 percent of a curing catalyst, wherein the adhesive refers to a hydroxyl-terminated polymer; the curing agent refers to an isocyanate compound; the reinforcing filler refers to an inorganic compound; the anti-aging agent refers to an aromatic compound; the network regulator refers to a compound which contains at least two functional groups; and the curing catalyst refers to an organic metal compound. The combustion-restricted layer formula disclosed by the invention has the characteristics of good processing property, room temperature curing property, adjustable curing time and excellent overall performance and is applied to end face cladding of a high-energy propellant engine.

Disclosed is a process for the synthesis of Nicorandil (1), 2-(nicotinamide)ethyl nitrate, starting from N-(2-hydroxyethyl)nicotinamide (15), using nitration with nitric acid in the presence of acetic anhydride Said synthesis method is particularly advantageous because it solves the safety problems involved in the use of nitric acid as nitrating agent, and allows a product with excellent yields and quality to be isolated.

The invention belongs to the technical field of nitrocotton production methods, and particularly relates to a method for preparing cellulose nitrate from bamboo fibers. The method provided by the invention realizes diversification of raw materials in the production of nitrocellulose, and comprises the following steps: 1) dissolving the bamboo fibers in water; 2) adding sodium hypochlorite for chlorination, and controlling the pH value to be less than or equal to 2; 3) filtering, and adding a 0.1-0.3wt% sodium hydroxide solution into the filter residue; 4) filtering, and adding a 0.05-0.3wt% sodium hypochlorite solution into the filter residue; 5) filtering, adding water into the filter residue and controlling the pH value to be less than or equal to 3.5; 6) washing and drying to obtain the pretreated bamboo fibers; 7) mixing 100 parts by weight of pretreated bamboo fibers and 2,500-6,000 parts by weight of mixed acid at the temperature of 33-47 DEG C, wherein the reaction lasts for 38-50 minutes; and 8) boiling, washing and drying to obtain the cellulose nitrate. The method provided by the invention widens the application range of the raw materials in the production of nitrocellulose, and the prepared cellulose nitrate is applied to the military and civil fields according to different nitrogen contents respectively.

The invention relates to a method for improving interface adhesive property of an HTPB (hydroxyterminated polybutadiene) liner and an NEPE (Nitrate Ester Plasticized Polyether) high-energy propellant. The method comprises the following step: adding a curing catalyst in the HTPB liner, wherein the curing catalyst is one or a combination of triphenyl bismuth (TPB), iron naphthenate, magnesium naphthenate, zinc naphthenate, zinc isoocatanoate, calcium naphthenate or stannous octoate, wherein the adding amount of the curing catalyst accounts for 0.3-2.5 percent the total weight of the HTPB liner. According to the method, the proper curing catalyst is added in the HTPB liner so that the migration loss of the curing catalyst in the interface propellant is compensated, the curing speed of the interface propellant is kept, the adverse influence of external factors to curing and mechanical property of the interface propellant is reduced, and the interface adhesive property of the liner and the propellant is remarkably improved.

The invention relates to a printable hot stamping layer and a preparation method thereof, and the printable hot stamping layer adopts the following components and is prepared according to the following parts by weight: 15-25 parts of modified polyurethane resin, 3-10 parts of furfural polyketone resin, 10-20 parts of thermoplastic acrylic resin, 1-12 parts of cellulose nitrate, 2-5 parts of cellulose resin, 0-10 parts of polyvinyl butyral, 30-60 parts of butanone, 5-10 parts of ethyl acetate, 5-10 parts of n-propyl ester, 1-2 parts of reaction initiator and 0.5-1 part of reaction terminator. The method comprises the following steps: 1) firstly pouring all solvents into a reaction kettle according to the requirements of the formula, heating to 50-80 DEG C and stirring; 2) keeping stirring, sequentially pouring polyurethane resin, furfural polyketone resin, modified acrylic resin, cellulose nitrate, cellulose resin and polyvinyl butyral into the reaction kettle, dripping the reaction initiator into the reaction kettle within 1 hour, and continuously stirring for 2.0-3.0 hours; 3) detecting the infrared spectrum and adding the reaction terminator; 4) measuring the solid content, and adjusting to the theoretical value; and 5) slowly stirring and cooling to 20 DEG C. The printable hot stamping layer is characterized by good printing effect after hot stamping, environmental protection and the like.

The invention discloses a high-ratio methanol fuel composite additive for vehicles. The composite additive is prepared from the following raw materials in percentage by mass: 50-70% of aliphatic ester, 10-30% of nitrate, 5-10% of glycerol, 5-10% of benzotriazole and 5-10% of high carbon alcohol. According to the high-ratio methanol fuel composite additive, the aliphatic ester of which the carbon chain number is about 18 is adopted, and the lubricating property, corrosion resistance and wear resistance of the methanol fuel for vehicles can be greatly improved. The nitrate is an excellent ignition improver and combustion improver, and the glycerol, benzotriazole and high carbon alcohol are excellent corrosion inhibition components and cosolvents. According to the methanol fuel composite additive for vehicles prepared by mixing the substances, the performance of the fuel is greatly improved.

The object of the present invention is to provide an oxygen isotope concentration method capable of concentrating the stable oxygen isotopes of ¹⁷O and ¹⁸O which can be carried out using a simple device configuration.

The present invention relates to a method for concentrating an oxygen isotope in separated oxygen by irradiating ozone with light, selectively dissociating an isotopomer of ozone containing an oxygen isotope in its molecule into oxygen, followed by dissociating the ozone and separating the formed oxygen from the non-dissociated ozone. The basic configuration of the device is provided with an ozone formation unit 11 that forms ozone from raw material oxygen, an ozone separation unit 12 that separates ozone formed with said ozone generation unit and raw material oxygen, an ozone photodissociation unit 13 that radiates light of a specific wavelength onto the ozone separated by said ozone separation unit 12 and selectively dissociates ozone containing an oxygen isotope in its molecule into oxygen, and an oxygen separation unit that separates the oxygen formed by dissociating ozone in said ozone photodissociation unit 13 and non-dissociated ozone to concentrate the oxygen isotope in the oxygen. The present invention also relates to a method for concentrating an oxygen isotope comprising an ozone photodissociation step, in which light is radiated onto a rare gas-ozone mixed gas containing ozone and at least one type of rare gas selected from krypton, xenon and radon to selectively dissociate ozone containing a specific oxygen isotope in its molecule into oxygen, and an oxygen isotope concentration step, in which the oxygen separated from ozone in said ozone photodissociation step is separated from non-dissociated ozone and rare gas to concentrate the oxygen isotope present in the separated oxygen. An oxygen isotope may also be concentrated in a dissociation reaction product by irradiating a gas containing a peroxide selected from hydroperoxides, (di)alkyl peroxides, peroxyacids including peracids, (di)acyl peroxides, peroxy esters, peroxycarbonates, peroxydicarbonates, diperoxycarbonates, peroxalates, cyclic peroxides, ozonides and endoperoxides, nitrite esters and nitrate esters, and selectively dissociating a peroxide containing a specific oxygen isotope in its molecule.

The invention discloses bile nitrate derivant in the Ia and Ib as drug composition of activated ingredient, which treats hepatitis virus, wherein R1 is trans- or cis-OH; R2 is H or OH; A is L- or D-serine, threonine or cysteine residue, cis- or trans-3-hydroxyproline or 4-hydroxyproline residue; X is oxygen or sulphur.

The invention discloses a Ti3C2-containing composite semipermeable membrane used for light evaporation of water, and a preparation method and application of the membrane. The method includes the following steps that 1, a Ti3AlC2 raw material is added into an etching agent, the mixture is stirred fully, suspension liquid is obtained, and the suspension liquid is subjected to centrifuging suspensionand drying in vacuum; 2, Ti3AlC2 powder and an intercalation solvent are mixed and stirred, and the mixture is subjected to centrifuging suspension and drying in vacuum so as to prepare the Ti3AlC2 powder with a layered structure; 3, cellulose nitrate is used for preparing a semipermeable membrane precursor solution; 4, the prepared Ti3AlC2 powder with the layered structure is added in the semipermeable membrane precursor solution, the mixture is stirred evenly, uniformly spread in a flat-base container, and then naturally dried, and Ti3C2-containing composite semipermeable membrane is obtained. According to the preparation method, the process is simple, the cost is low and the practicability is high. The photothermal conversion effect of the prepared composite semipermeable membrane is good, and the composite semipermeable membrane has a very good application prospect in many fields such as light evaporation of water and water desalination.

The invention discloses a stirring reaction device for producing carboxymethyl cellulose nitrate. The stirring reaction device comprises a tank body, and the tank body is provided with a shaking self-rotating frame. A motor is started to drive a turntable to rotate, the turntable drives the shaking self-rotating frame to revolve, and the shaking self-rotating frame is limited in a fixed frame through a limiting tube so that the shaking and revolving are realized. In revolving of the shaking self-rotating frame, the shaking self-rotating frame self-rotates through a gear and a ring-shaped rackmeshed with the gear so that the stirring is full and uniform and the reaction is promoted.

The invention discloses the azido dihydroxypropyl cellulose nitrate preparation method and synthesis which comprises, subjecting natural cotton and cellulose to alkalization under semi-homogeneous phase reaction condition, charging epoxy propyl alcohol for sectionwise etherification to the alkali cellulose, obtaining dihydroxy cellulose ether whose substitution degree is between 0.5-1.2, completely dissolving in dimethyl polyamide / 9% LiCl system, scouring, purifying, drying and dissolving in dimethyl sulfoxide, carrying out homogeneous phase nitrine at high temperature.

The invention discloses normal-temperature continuous production technology for a cetane number improver, which belongs to the technical field of the preparation of organic nitrate ester compounds, and comprises the steps of using nitramine or nitric acid and isooctanol to react under the action of a catalyst. The normal-temperature continuous production technology for the cetane number improver is characterized by changing concentrated sulfuric acid as the catalyst, using different proportions of the concentrated sulfuric acid, concentrated nitric acid and water to control different reaction temperatures and realize continuous production, returning waste acid to an acid distribution post for acid mixing according to the content of the acid, then circularly utilizing the waste acid, finally selecting a normal reaction temperature of between 8 DEG C below zero and 40 DEG C in order to the safety and the control of the purity and the yield of energy consumption and the like, and utilizing the proportion of acid mixing to control reaction rate to achieve optimum process conditions such as continuous recycling of the waste acid, continuous feeding nitrification and the like. The technology overcomes the disadvantages of unsteady quality of products, large potential safety hazard, high energy consumption and material consumption and the like, improves the yield, ensures that the quality of the products entirely and steadily reaches that of high-class products, and greatly improves the utilization efficiency of equipment.

The invention discloses a semiconductor chalcogenide-containing composite semi-permeable membrane used for water evaporation by light, a preparation method and a purpose thereof. The method comprises the following steps: 1) employing cellulose nitrate to prepare a semi-permeable membrane precursor solution; 2) adding the chalcogenide to the above precursor solution, violently stirring the materials to obtain a mixed solution; 3) spreading the above mixed solution on a container having a flat bottom, naturally drying the solution to form the membrane, and preparing the chalcogenide-containing semi-permeable membrane; 4) placing the chalcogenide-containing composite semi-permeable membrane in a silver nitrate solution for immersing for a while; and 5) taking the immersed chalcogenide-containing semi-permeable membrane out, naturally drying the material, and preparing the semiconductor chalcogenide-containing semi-permeable membrane. The method has the advantages of simple process and low cost; the provided semi-permeable membrane has good photo-thermal transition effect, and has very good application prospect in the fields of water evaporation by light and seawater desalination.

The invention discloses a hydroxyl-functionalized carbon nanotube used for polyurethane chain extender and a preparation method thereof. Firstly, a compound or a polymer, the terminal group of which is multi-hydroxyl, is used for synthesizing a compound or a polymer, the terminal group of which is provided with a nitrate ester group; and then the nitrate ester group is transformed into an azide group to obtain a compound or a polymer, the terminal of which is sealed by the azide group and the hydroxyl group simultaneously. Through the addition reaction between the azide group and a ring on the surface of the carbon nanotube, the compound or the polymer with the hydroxyl group is connected with the surface of the carbon nanotube by covalent bonds to realize the preparation of the hydroxyl-functionalized carbon nanotube. The surface of the hydroxyl-functionalized carbon nanotube prepared by the invention is connected with one hydroxyl or a plurality of hydroxyls; therefore, when being applied to the synthesis of polyurethane, the hydroxyl-functionalized carbon nanotube can function as polyurethane chain extender, the interface combining power between functionalized carbon nanotube and polyurethane matrix can be improved greatly, meanwhile, the existence of hydroxyl groups can well improve the dispersivity of the carbon nanotube in the polyurethane matrix.

The invention relates to the field of energy, and in particular relates to a novel low carbon methanol diesel and an additive and a preparation method thereof. The technical scheme of the invention is as follows: the preparation method comprises the following steps of: preparing the additive; adding and mixing the following components: 7 parts of surfactants, 10 parts of oleic acid, 25 parts of fatty acid methyl ester, 15 parts of vegetable oil, 10 parts of multi-carbon alcohol (C4-C8 linear chain fatty alcohol), 8 parts of fatty alcohol-polyoxyethylene ether, 15 parts of cyclohexane acid glyceride and 10 parts of organic nitrate (c-RONO2 for short); mixing and stirring for homogenization; putting statically so as to obtain uniform emulsion; mixing; weighing 1000 parts of methanol-diesel mixture fuel, wherein the mass ratio of the methanol and the diesel is 15:85, putting in a container; adding a composite additive according to the condition that the mass ratio of the methanol to the diesel mixture fuel is 200:1; and stirring till the microemulsion is clear and uniform.

The invention relates to an alkylated neutral polymer bonding agent, a preparation method and a propellant. The alkylated neutral polymer bonding agent is prepared by the invention for the first time;a molecular structure contains three groups including hydroxyl, terminated alkynyl, cyano and the like; in a molecular chain, the cyano is adsorbed on the surface of nitramine filler to form a polymer shell layer which is not dissolved in nitrate, and the dissolving of plasticizers including the nitrate and the like on the nitramine filler is inhibited; the physical enhancing effect of the nitramine filler is reinforced, and the modulus and strength of a composite material are improved; the hydroxyl enters a crosslinking curing network system through an isocyanate curing agent to enhance theeffect between a bonding agent and the nitramine solid filler; the alkynyl and azido of an azido adhesive molecule are subjected to click reaction to enhance the mutual effects between the adhesive molecule and the bonding agent and the adhesive molecule. The three mutual effects can be used for remarkably enhancing the effect between the filler and an adhesive matrix, and remarkably improving themodulus and tensile strength of the composite propellant.