2996 results about "Propanoic acid" patented technology

A forest fire retardant composition contains a retardant compound that includes a potassium salt. The potassium salt may include a potassium salt of an organic acid, a potassium salt of an inorganic acid, or mixtures thereof. The organic acid may include formic acid, acetic acid, propanoic acid, butanoic acid, lactic acid, oxalic acid, malic acid, gluconic acid, tartaric acid, uric acid, malic acid, or citric acid. The inorganic acid may include sulfuric acid, phosphoric acid, carbonic acid, or hydrochloric acid. The composition may be in the form of a dry concentrate, a liquid concentrate, or a final diluted product. The final diluted product is effective in suppressing, retarding, and controlling forest fires while exhibiting corrosion resistance and low toxicity.

The invention relates to the technical field of composite film preparation, in particular to a multi-layer co-extrusion nano ceramic coating high-barrier medicine packaging composite film and a preparation method thereof.The multi-layer co-extrusion nano ceramic coating high-barrier medicine packaging composite film comprises a base material layer, a gas barrier layer, a bonding transition layer and a nano ceramic functional coating; the base material layer comprises the following components in parts by mass: 80-100 parts of biaxially oriented polypropylene; 20 to 30 parts of metallocene linear low density polyethylene; 5 to 8 parts of nano titanium dioxide; 0.5 to 1 part of beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid; and 0.3 to 0.6 part of calcium stearate. Through the multi-layer co-extrusion and gradient curing technology and the five-layer co-extrusion technology, it is ensured that the thickness of a base film is uniform and interlayer bonding is firm, the adhesive force of the coating is enhanced through plasma surface treatment, and activity retention and uniform distribution of functional components are guaranteed through the segmented curing strategy of the nano ceramic coating; compared with a traditional hot-pressing compounding or solvent coating process of the composite film, the energy consumption and the solvent residue risk are greatly reduced, meanwhile, the production efficiency and the product consistency are improved, and large-scale application is provided for medicine packaging.

The invention belongs to the technical field of flame-retardant macromolecules, and particularly relates to intrinsic heat-conducting flame-retardant recycled epoxy resin and a preparation method thereof. The preparation method comprises the following steps: (1) carrying out a reaction on diethanol amine and 9, 10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide (DOPO) to obtain an intermediate A; and (2) carrying out condensation polymerization on the intermediate A and phenylphosphonic acid to prepare the phosphate-terminated polyester flame retardant (PEF). And (3) carrying out epoxidation on 4, 4 '-biphenol to prepare the liquid crystal epoxy precursor LEP. And (4) mixing PEF, LEP and 3, 3 '-dithiodipropionic acid, and heating and curing to prepare the epoxy resin. The prepared epoxy resin has intrinsic heat conduction, flame retardance and efficient recoverability, and is a high polymer material with great potential.

The invention discloses an antistatic polyisoprene rubber anesthesia air storage bag, and relates to the technical field of anesthesia air storage bags. The antistatic polyisoprene rubber anesthesia air storage bag is prepared from the following raw materials in parts by weight: 100 parts of polyisoprene latex, 0.5 to 2 parts of a stabilizer, 1 to 2 parts of a sodium p-styrenesulfonate aqueous solution, 3 to 6 parts of nano silicon dioxide suspension dispersion liquid, 1 to 2 parts of an anti-aging agent, 0.8 to 2 parts of conductive graphite and 3 to 6 parts of a vulcanization bag, the anti-aging agent is prepared by the following steps: reacting 3-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid with glycerol 1-oleyl ether-d5 to generate an esterification product, epoxidizing the esterification product with hydrogen peroxide and formic acid, and reacting the epoxidized product with N-phenyl-1, 3-phenylenediamine, and has excellent migration resistance. By adding the anti-aging agent into the polyisoprene rubber, the anti-aging capability of the anesthesia air storage bag is improved.

The invention discloses a preparation method of an ester polycarboxylic acid water reducer, and belongs to the technical field of concrete admixtures. The preparation method of the ester polycarboxylic acid water reducing agent comprises the following steps: under an alkaline condition, carrying out free radical polymerization reaction on a polyether macromonomer and an unsaturated carboxylic acid monomer under the action of a chain transfer agent A, a chain transfer agent B and an initiator, continuously adding a catalyst, and carrying out dehydration esterification reaction under the action of the catalyst, so as to prepare the ester polycarboxylic acid water reducing agent, the polyether macromonomer is monohydroxy polyether of which the molecular weight is between 500 and 5000; the chain transfer agent A is one of acetone, isopropanol, sodium hydrogen sulfite, sodium hypophosphite, sodium formate and the like; the chain transfer agent B is one of mercaptoethanol, mercaptopropanol, mercaptoacetic acid, mercaptopropionic acid and the like; the catalyst is a phosphonic acid compound with hydroxyl or amino. The preparation method is simple in process and low in energy consumption, and the prepared ester polycarboxylic acid water reducer product is excellent in performance.

The invention relates to the technical field of adhesives, and discloses an antibacterial mildew-proof water-based adhesive and a preparation method thereof. The preparation method of the antibacterial and mildew-proof water-based adhesive comprises the following steps: reacting 2, 2-dimethylolpropionic acid with castor oil to obtain hyperbranched bio-based polyol; modifying the hyperbranched bio-based polyol by using a modifier to obtain modified bio-based polyol; the preparation method comprises the following steps: preparing a waterborne polyurethane dispersion liquid by taking modified bio-based polyol, a hybrid modified BN / MOF composite material and hexamethylene diisocyanate as raw materials and 1, 4-butanediol as a chain extender; the preparation method comprises the following steps: mixing a waterborne polyurethane dispersion liquid, a wetting agent, a defoaming agent, a thickening agent and water to obtain a component A; an aliphatic curing agent is used as a component B; during use, the component A and the component B are mixed and stirred. The antibacterial and mildewproof water-based adhesive disclosed by the invention has excellent adhesion performance, water resistance, self-repairing performance and lasting antibacterial and mildewproof performance.

The invention discloses a high-temperature-resistant power tube and a production process thereof, and belongs to the technical field of power tube preparation. The high-temperature-resistant electric power tube is prepared from, by weight, 60-80 parts of a high-temperature-resistant base material, 10-30 parts of carbon fibers and 1-5 parts of a modified anti-aging agent, the high-temperature-resistant base material is prepared from 2, 3, 4-trifluorobenzaldehyde, malonic acid, oxynaphthalene propionic acid, trifluoroacetic anhydride and 2, 2-bis [4-(4-aminophenoxy) phenyl] propane, and the modified anti-aging agent is prepared from 2, 3, 4-trifluorobenzaldehyde, malonic acid, oxynaphthalene propionic acid, trifluoroacetic anhydride and 2, 2-bis [4-(4-aminophenoxy) phenyl] propane. The modified anti-aging agent is prepared from absolute ethyl alcohol, paeonol, sodium hydroxide and 2-methoxybenzaldehyde. The power tube prepared by the method has excellent high temperature resistance, mechanical property and aging resistance.

The invention discloses a temperature / CO2 dual-response zwitterionic hydrogel profile control agent, which is prepared by taking a monomer A, a monomer B and a monomer C as raw materials, adding a cross-linking agent and an initiator, and carrying out polymerization reaction in a water medium. The monomer A is selected from any one of acrylamide, acrylic acid and 1-vinyl-2-pyrrolidone; the monomer B is selected from any one of [2-(methacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide, 2-methacryloyloxyethyl phosphorylcholine and 3-((2-(methacryloyloxy) ethyl) dimethylamino) propionic acid inner salt; and the monomer C is selected from any one of 2-(dimethylamino) ethyl methacrylate, dimethylamino propyl methacrylamide and polyethyleneimine. The profile control agent has double swelling mechanisms, has outstanding temperature and salt resistance, resists 220000 mg / L of mineralization water, is suitable for high-salt reservoirs, and is good in long-term aging property.

The invention provides a secondary battery and electronic equipment, the secondary battery comprises a negative electrode plate and an electrolyte, the negative electrode plate comprises a negative electrode active material layer, the negative electrode active material layer comprises graphite and a silicon carbon material, and the average sphericity of the silicon carbon material is 0.81-0.95; the electrolyte comprises ethylene carbonate, propylene carbonate, ethyl propionate and propyl propionate, based on the mass of the electrolyte, the mass percentage content of ethylene carbonate is a%, the mass percentage content of propylene carbonate is b%, the mass percentage content of ethyl propionate is c%, the mass percentage content of propyl propionate is d%, and the range of (a + b) / (c + d) is 0.23-1.51. According to the invention, the discharge performance and the safety performance of the secondary battery at low temperature can be improved.

The invention provides a secondary battery and an electronic device. The secondary battery comprises a positive pole piece, a negative pole piece, electrolyte and an isolating membrane arranged between the positive pole piece and the negative pole piece. The separator film includes a base film and an inorganic coating layer on opposite surfaces of the base film. The inorganic coating includes a plurality of inorganic particles. Dv99 of the inorganic particles is A, and the unit is [mu] m. And the porosity of the base membrane is B%. Wherein the ratio B / A of B to A is greater than or equal to 1.25 and less than or equal to 40. And the electrolyte comprises propyl propionate. Based on the total mass of the electrolyte, the mass percentage content of propyl propionate is C%, and C is more than or equal to 20 and less than or equal to 45. Through the special design of the isolating membrane and the matching of the content control of the propyl propionate in the electrolyte, the secondary battery has low impedance and high safety performance under high-temperature and high-rate charge and discharge, and can effectively prevent overcharge and improve the cycle performance of the secondary battery.

The invention relates to the technical field of microorganisms, in particular to a culture medium and a method for culturing Ackermania muciniphila for activating Amuc-1260 by using lambda-carrageenan as a carbon source, according to the culture method, the lambda-carrageenan is used for replacing a traditional carbon source, thallus growth and proliferation can be remarkably promoted, the effect is optimal under the condition of 2.00 g / L, and the culture cost is low. Compared with the conventional carbon source (glucose), the carbon source is improved by 92.91%. Further research finds that the lambda-carrageenan can induce the Akk bacteria to up-regulate the expression of glycoside hydrolase such as Amuc-1260 and enhance the activity of pathways such as glycosaminoglycan degradation, amino acid metabolism and insulin signals, so that the metabolic adaptability and energy utilization efficiency of the bacteria are improved. Meanwhile, the Akk bacteria secrete more functional short-chain fatty acids such as acetic acid, propionic acid and the like under the condition, and have the effects of regulating intestinal health and maintaining metabolic homeostasis. The invention provides a new theoretical basis and technical support for large-scale culture of Akk bacteria and development of a metabiotic product.

The present invention relates to a preparation method of an intelligent self-repairing, flame-retardant and light-resistant water-based polyurethane coating. The method comprises the following steps: preparing a self-made hyperbranched flame retardant and using it in the synthesis of a polyurethane prepolymer; cooling the mixture to 58° C., adding 2,2-dimethylolpropionic acid, reacting the mixture for 1 to 2 hours, adding 1 to 2 parts of a disulfide compound, reacting the mixture for 1 to 2 hours at 60 to 80° C., adding 1 to 2 parts of a hydrogen bonding agent, reacting the mixture for 1 hour at 60 to 80° C., adding 0.5 to 1.5 parts of a coumarin derivative, and reacting the mixture for 60 to 90° C. The mixture was stirred for 1-2 hours, and then spiropyran, diethanol monoisopropanolamine, and 0.01 parts of p-toluenesulfonamide were added, and the mixture was reacted at 50°C for 30 minutes. The temperature was lowered to 40-45°C, and 1-2 parts of triethylamine were added, and the mixture was reacted for 1-2 hours. The mixture was cooled to room temperature, and 60-65 parts of water were added. The mixture was stirred at a speed of 1800-2000 r / min for 0.5-1 hour to obtain an intelligent self-healing, flame-retardant, and light-resistant water-based polyurethane coating. The flame retardancy and self-healing properties of the obtained water-based polyurethane were significantly improved.

The invention relates to the field of wear-resistant fabrics, and discloses a high-strength wear-resistant fabric and a preparation method thereof.The high-strength wear-resistant fabric comprises a surface coating and a base cloth layer, the surface coating and the base cloth layer are formed by coating and drying modified waterborne polyurethane emulsion, and the modified waterborne polyurethane emulsion comprises isophorone diisocyanate, ethylene glycol terephthalate, 2, 3, 4-trimethyl-1, 3-pentanediol monoisobutyrate, polyisobutylene glycol monoisobutyrate, according to the present invention, 2, 2-dimethylolpropionic acid, a modified additive, a flame retardant modifier, 1, 4-butanediol, trimethylolpropane and the like are adopted to prepare the modified additive, dopamine is subjected to in-situ auto-polymerization on the surface of a titanium dioxide nanotube, nano-silica is grown on the surface in situ, and modification is performed through a polysiloxane solution to prepare the modified titanium dioxide nanotube flame retardant; the polysiloxane solution is prepared by carrying out a reaction on methyl triethoxysilane and dihydroxyl-terminated polydimethylsiloxane; the flame-retardant modifier is prepared by reacting 2-chloro-4, 6-diamino-1, 3, 5-triazine, 5-hydroxymethylfurfural and phosphorous acid, so that the fabric is endowed with good mechanical properties and wear resistance, and the fabric has a hydrophobic surface and is excellent in flame retardance and durability.

The present invention relates to the technical field of pharmaceutical preparations, and specifically discloses a beclomethasone dipropionate suspension for inhalation and a preparation method thereof. The present invention uses polyethylene glycol hyaluronic acid as a surfactant, polysorbate 80 (II) as a wetting agent, and colloidal microcrystalline cellulose as a suspending agent, first prepares an auxiliary material solution containing part of the surfactant, the wetting agent and the suspending agent, and a drug solution of beclomethasone dipropionate and the surfactant, and then mixes the drug solution with the auxiliary material solution and homogenizes under high pressure to prepare the beclomethasone dipropionate suspension for inhalation. The prepared beclomethasone dipropionate suspension has excellent storage stability and effective lung deposition rate, effectively solves the potential harm to respiratory tissue caused by the use of a large amount of Tween 20 and Span-type surfactants in the original research, can achieve a good replacement for the original research product, and has a simple preparation process, good repeatability, and is easy to achieve industrialized large-scale production, and has a high value of promotion and application.

The invention discloses propionibacterium capable of obtaining high-yield propionic acid through compound mutation screening and a method for fermenting propionic acid by using the propionibacterium. The high-yield propionic acid strain YCBS010 (CGMCC No.31160) is obtained by carrying out compound mutagenesis on acid-producing propionibacterium CGMCC 1.2232 serving as an original strain through microwave-ultrasonic combined mutagenesis and compound normal-pressure and room-temperature plasma (ARTP) mutagenesis means. According to the invention, YPA15 is used as a starting strain, microwave and ultrasonic combined mutagenesis is carried out for 100 seconds to screen a bacterial strain with increased propionic acid yield, then ARTP mutagenesis is carried out for 90 seconds to screen out a high-yield mutant strain YCBS010, fermentation in a 1-ton tank verifies that the highest propionic acid yield reaches 65.87 g / L and the fermentation intensity is 0.73 g / L.h after fermentation is carried out for 90 hours, and the bacterial strain has better industrial fermentation potential.

The invention discloses an efficient denitrification method and system for landfill leachate, and the method comprises the following steps: diluting waste molasses, and then adding a compound enzyme preparation containing cellulase, pectinase and alpha-amylase for enzymolysis pretreatment to obtain a pretreatment solution; inoculating the pretreatment liquid with a compound flora containing clostridium butyricum and succinic acid-producing anaerobic spirillum, carrying out anaerobic fermentation, and separating to obtain a liquid carbon source containing acetic acid and propionic acid and fermentation residues; mixing the fermentation residues with waste sugar residues, and performing pyrolysis to prepare biochar; and synchronously adding the liquid carbon source and the biochar into a denitrification reactor, and carrying out denitrification on the landfill leachate. The total nitrogen removal load of the landfill leachate denitrification system is increased by 60% compared with that of a single carbon source process, and the sugar manufacturing solid waste recycling rate gt is achieved; 95%. According to the method disclosed by the invention, the dual goals of efficient denitrification and solid waste recycling are achieved through cooperative treatment of the waste molasses and the waste sugar residues in the sugar manufacturing process.

A system for preparing acrylic acid by utilizing carbon dioxide through electro-biological coupling is characterized by comprising an electro-catalysis methanol production unit, a biological fermentation 3-hydracrylic acid production unit, a 3-hydracrylic acid purification unit and an acrylic acid production unit which are connected in sequence, the electro-catalysis methanol production unit is used for carrying out electro-catalysis on hydrogen produced by water through solar electrolysis and carbon dioxide directly captured by air under the action of a ZnO-ZrO2 catalyst to obtain methanol; the unit for producing the 3-hydracrylic acid through biological fermentation takes the methanol obtained by the electrocatalysis unit as a substrate to carry out biological fermentation, and a fermentation product is subjected to gas-liquid separation to obtain fermentation liquor containing the 3-hydracrylic acid; the 3-hydracrylic acid purification unit is used for carrying out solid-liquid separation on the obtained fermentation liquor of the 3-hydracrylic acid and extracting to obtain the 3-hydracrylic acid; the acrylic acid production unit is used for carrying out dehydration reaction on the purified 3-hydracrylic acid to obtain acrylic acid; carbon dioxide is fixed through an electrocatalysis and biological fermentation coupling technology, and the problem that existing fossil-based raw materials are high in dependency degree is solved.

The invention relates to the technical field of compound fertilizers, and discloses a boron-zinc-molybdenum synergistic compound fertilizer, which is prepared from the following raw materials in parts by weight: calcium nitrate, ammonium polyphosphate, potassium sulfate, magnesium sulfate, disodium octoborate tetrahydrate, sugar alcohol chelated zinc, sodium molybdate and a synergistic auxiliary agent, the feed additive is prepared from a feed additive, an activator, 5-alginic acid oligosaccharide, aminolevulinic acid, sugar alcohol chelated magnesium, an antagonist, a stress-resistant enhancer and a coating material. According to the boron-zinc-molybdenum synergistic interaction compound fertilizer and the preparation process thereof, the disodium octoborate tetrahydrate, the sugar alcohol chelated zinc and the sodium molybdate are compounded according to a specific proportion, antagonism is avoided through proportion limitation, the synergistic effect of the three elements is remarkably enhanced, and the problem that a single element is insufficient or excessive is solved; chelated elements such as sugar alcohol chelated zinc and sugar alcohol chelated magnesium are combined with an activating agent (humic acid chelated calcium and silica sol) to form a gel-state chelate, so that the trace elements can be prevented from being fixed by soil, and the transfer efficiency of the trace elements in crops is improved.

The invention discloses an analysis method for detecting short-chain fatty acid in table salt by headspace arrow-shaped solid phase microextraction-gas chromatography mass spectrometry, and belongs to the field of analysis and detection. According to the method, firstly, based on a headspace arrow-shaped solid-phase microextraction technology, polar short-chain fatty acids are extracted and enriched by using an extraction head of 100 [mu] m Polyacrylate, and then gas chromatography-mass spectrometry is used for detection, so that qualitative and quantitative detection of nine short-chain fatty acids such as acetic acid, propionic acid, isobutyric acid, butyric acid, 2-methylbutyric acid, valeric acid, 2-methylvaleric acid, 4-methylvaleric acid and hexanoic acid in the table salt can be realized. According to the method, the headspace arrow-shaped solid-phase microextraction technology is used for extracting the short-chain fatty acid in the table salt for the first time, the effects of interference removal, concentration and enrichment are achieved, and the detection limit of the method is reduced by about 2 orders of magnitude compared with that of a headspace-gas chromatography-mass spectrometry method. The method is simple in sample preparation, high in sensitivity, good in recovery rate and stability and suitable for accurate detection of the short-chain fatty acid in the table salt.

The invention belongs to the technical field of pharmaceutical analysis, and particularly relates to a method for detecting related substances in landiolol hydrochloride for injection. According to the method, an HPLC (High Performance Liquid Chromatography) method is adopted, octadecylsilane chemically bonded silica is taken as a filler, and a mobile phase A (the volume ratio of a monopotassium phosphate solution containing pentafluoropropionic acid to methanol is 58: 42-62: 38) and a mobile phase B (the volume ratio of the monopotassium phosphate solution containing pentafluoropropionic acid to methanol is 28: 72-32: 68) are used for gradient elution to detect the related substances in landiolol hydrochloride for injection. The detection method is high in specificity, high in sensitivity, good in accuracy and convenient to operate, the medicine quality can be effectively controlled, the technical blank of detection of the landiolol hydrochloride related substances for injection is filled, a reference standard is provided for quality control of landiolol hydrochloride for injection, and therefore the safety and reliability of clinical medication are guaranteed.

The utility model discloses a high-purity methyl 3-methoxypropionate filtering device which is provided with a product tank for conveying materials, and a conveying pipe is mounted on the right side of the outer surface of the product tank; comprising a molecular sieve device installed on the upper side of the outer surface of the conveying pipe, a first feeding pipe is installed on the upper side of the molecular sieve device, and an ion exchange device is installed at the other end of the first feeding pipe. According to the high-purity methyl 3-methoxypropionate filtering device, the conveying pipe with the conveying pump is arranged, materials in the product tank are stably pumped into the filtering device, and the molecular sieve device is matched, so that methyl alcohol, methyl acrylate, acrylic acid, sodium methoxide and other impurities in industrial methyl 3-methoxypropionate can be effectively adsorbed and removed; and ion-state metal, anions, organic pigment free alkali and the like are removed by gradually matching with an ion exchange device, and finally, the material is filtered by matching with a filter element filter, and the purity of the product is kept.

The invention discloses a method for preparing dimethyl carbonate through reaction of CO and methyl nitrite, belongs to the technical field of preparation of dimethyl carbonate, and aims to solve the problem that in the prior art, in the process of preparing dimethyl carbonate through catalysis of reaction of CO and methyl nitrite, the reaction time is short. The preparation method specifically comprises the following steps: in an inert gas atmosphere, mixing and stirring isocyanatopropyltriethoxysilane and N, N-dimethylformamide, raising the temperature of a reaction system to 50-60 DEG C, carrying out a reaction for 1-2 hours, and carrying out a reaction for 1-2 hours, so as to obtain a reaction solution; and 3-aminopropionic acid is added into the reaction system. According to the method, silicon-aluminum coating, potassium modification and 18-crown-6-ether modification are sequentially performed after a halogen-free palladium-copper catalytic system is prepared, so that the conversion rate of impurities and the chromatic value of a product are reduced, the conversion rate of methyl nitrite is effectively increased, and the service life of the catalyst is effectively prolonged.

An active energy ray-curable inkjet printing ink composition satisfies requirements A to E below is provided: (A) the content of amine-modified oligomer is 1.0 to 20.0% by mass; (B) alkoxy group-containing (meth)acrylate monomers are contained by 2.0 to 20.0% by mass; (C) (meth)acrylate monomers having an alkyl group with 6 to 20 carbon atoms is contained by 2.0 to 25.0% by mass; (D) at least one type selected from the group that consists of 1,6-hexanediol diacrylate, 3-methyl-1,5-pentanediol diacrylate, dipropylene glycol diacrylate, 1,10-decanediol diacrylate, propoxylated(2)neopentyl glycol diacrylate, and hydroxypivalic acid neopentyl glycol diacrylate is contained by 30.0 to 60.0% by mass; (E) as photopolymerization initiators, ethoxy(2,4,6-trimethylbenzoyl)phenylphosphine oxide is contained by 3.0 to 15.0% by, and oligo(2-hydroxy-2-methyl-1-(4-(1-methylvinyl)phenyl)propanone) and / or 2-hydroxy-1-{4-[4-(2-hydroxy-2-methylpropionyl)phenoxy]phenyl}-2-methylpropanone is / are contained by 2.0 to 10.0% by mass, where the total content of photopolymerization initiators is 6.0 to 25.0% by mass.

The invention belongs to the field of detection and analysis, and relates to a method for separating and detecting enantiomers in (S)-2-amino-3-[2-(tert-butoxy)-2-oxoacetamido] tert-butyl propionate hydrochloride. According to the method, HPLC is adopted for separation and detection, a polysaccharide derivative chiral chromatographic column is selected as a chromatographic column, a mobile phase A is a weak base aqueous solution, and a mobile phase B is acetonitrile and / or methanol. The method is strong in specificity, high in separation degree, high in accuracy, stable, reliable and high in sensitivity, and a simple, accurate, rapid and reliable detection method is provided for control of impurities in a starting material of (S)-2-amino-3-[2-(tert-butoxy)-2-oxoacetamido] tert-butyl propionate hydrochloride.

An artificial synthesis method for malonyl-CoA and use thereof are provided. By means of heterologous expression of an aminotransferase and a malonyl-CoA reductase, an artificial synthesis pathway for synthesizing malonyl-CoA by using β-alanine (β-ala) as a precursor is constructed as follows: firstly, under catalysis of a transaminase, β-ala transfers amino groups to α-ketonic acid (such as pyruvic acid, oxaloacetic acid, or α-ketoglutaric acid, etc.), to form an intermediate product 3-oxopropanoate and a corresponding amino acid; the 3-oxopropanoate generates malonyl-CoA under the action of the malonyl-CoA reductase. This pathway addresses the defects of the natural malonyl-CoA synthesis pathway, such as low carbon utilization, consumption of energy substance ATP, release of greenhouse gas CO2, and strict regulation of pathway enzymes, a pyruvate dehydrogenase (PDH) and an acetyl-CoA carboxylase (ACC), thereby achieving high yielding of products using malonyl-CoA as a precursor, including flaviolin, octanoic acid, phloroglucinol, pentadecaheptaene, natamycin, and spinosad.

The invention relates to a self-crosslinking flame-retardant insulating material and a preparation method thereof, and belongs to the technical field of insulating material preparation. The self-crosslinking flame-retardant insulating material comprises the following raw materials: polyethylene, modified vinyl silane, an epoxy flame retardant, a water producing agent, a catalyst and an initiator, the modified vinyl silane is prepared from a ring-opening reaction product and a diamine compound through a condensation reaction; the ring-opening reaction product is prepared from an epoxy silane coupling agent and a 2, 2-dimethylolpropionic acid derivative through a reaction; the 2, 2-dimethylolpropionic acid derivative is prepared from 2, 2-dimethylolpropionic acid and acrylic acid through esterification reaction; the epoxy flame retardant is prepared from a hydroxyl-terminated dendritic compound and an epoxidation agent through an epoxidation reaction; the hydroxyl-terminated dendritic compound is prepared from hexachlorocyclotriphosphazene and alkyl binary primary alcohol through a substitution reaction. By introducing the modified vinyl silane and the epoxy flame retardant, a bi-crosslinking interpenetrating network is formed in the obtained material, so that the problems in the background technology are solved.

The invention relates to the field of fabrics, in particular to a metallic yarn fabric based on a discontinuous aluminum layer and a processing technology thereof.The metallic yarn and polyester fibers are blended to serve as warps, the polyester fibers serve as wefts, the warps and the wefts are interwoven to obtain base cloth, the base cloth is subjected to discontinuous etching in the warp direction through etching liquid, and the pretreated base cloth is obtained; transferring the fabric into antibacterial finishing liquid for padding treatment to prepare the fabric. Modified waterborne polyurethane emulsion containing silicon and nitrogen elements is introduced into finishing liquid, polytetrahydrofuran glycol, hydroxyl-terminated polydimethylsiloxane and isophorone diisocyanate are used as raw materials, 2, 2-bis (hydroxymethyl) propionic acid is used as a hydrophilic chain extender, and cyanuric chloride derivative glycol based on menthol is used as a chain extender; the preparation method comprises the following steps: introducing nano zinc oxide as a finishing agent into a finishing liquid, firstly aminating the nano zinc oxide by using 3-aminopropyltriethoxysilane, then obtaining phytic acid modified nano zinc oxide by using electrostatic and hydrogen-bond interaction, and further grafting cyanuric chloride derivative diol based on menthol.

The invention relates to hydrogel for motion monitoring and / or drug delivery as well as a preparation method and application thereof, and relates to the technical field of new materials. The hydrogel is double-network hydrogel, and the double-network hydrogel comprises a first network, a second network and a cross-linking agent, the first network is mainly constructed from an N-hydroxyethyl acrylamide-beta-(acryloyloxy) propionic acid copolymer, the second network is mainly constructed from carboxylated cellulose nanofibers, and the cross-linking agent comprises zirconium ions. The hydrogel can realize motion monitoring and transdermal drug delivery functions, and has excellent mechanical properties.

The invention belongs to the field of microorganisms, and particularly relates to application of lactobacillus paracasei L9 in preparation of a preparation for improving pulmonary fibrosis of an aged mouse. According to the lactobacillus paracasei L9 disclosed by the invention, the synthesis of I-type collagen is reduced by regulating and controlling gene expression, so that pulmonary fibrosis is relieved; meanwhile, the L9 improves the content of propionic acid and butyric acid in intestinal tracts and serum by regulating the abundance of SCFA-producing microbial flora in the intestinal tracts, so that pulmonary fibrosis is inhibited, and the L9 is a potential ideal preparation for improving or treating aging-related pulmonary fibrosis.