32 results about "Triethylphosphite" patented technology

The invention provides epoxy resin for halogen-free flame-retardant self-leveling powder coating and a preparation method of the epoxy resin, and belongs to the technical field of powder coating. The flame retardant is mainly prepared from anhydrous piperazine, bisphenol A diglycidyl ether, trihydroxymethyl phosphorus oxide, triethyl phosphite, epoxy chloropropane, sodium hydroxide, N-methyl iminodiacetic acid, ethylene glycol diglycidyl ether and other main raw materials through polymerization. The prepared epoxy resin and 2-phenylimidazoline are subjected to low-temperature curing (135 DEG C / 20 min) on the premise that an additional flatting agent does not need to be used, the flexibility of a coating film is good, the impact resistance grade is high, the impact performance reaches the condition that no cracking phenomenon exists in the front and back 60cm, the leveling grade reaches the grade 7 or above, the gloss is high and reaches 95% or above, the oxygen index reaches 34% or above, and the halogen-free flame retardant performance is excellent.

The invention discloses a fluorenyl diphosphoric acid type self-assembled monomolecular layer hole transport material which takes a fluorene unit as a core and a diphenylamine group as a donor, and is a self-assembled monomolecular layer hole transport material with two phosphoric acid anchoring groups. The preparation method of the hole transport material comprises the following steps: (a) carrying out substitution reaction on 2, 7-dibromofluorene and dibromo-substituted alkane to obtain an intermediate I; (b) carrying out rearrangement reaction on the intermediate I and triethyl phosphite to obtain an intermediate II; (c) carrying out coupling reaction on the intermediate II and a diphenylamine derivative to obtain an intermediate III; and (d) mixing the intermediate III with a hydrolysis reagent, and carrying out hydrolysis reaction to obtain the fluorenyl diphosphonic acid type self-assembled monomolecular layer hole transport material. The invention also discloses an application of the material in a trans-perovskite solar cell. The hole transport material is low in synthesis cost and simple in route, has dual functions of hole transport and defect passivation, and has two phosphate groups to enhance the self-assembly strength and stability of the hole transport material.

The invention relates to a synthesis method of low-cost environment-friendly dioscorea element I. The synthesis method comprises the following steps: by taking 3, 5-dimethoxybenzyl alcohol as a raw material, brominating, reacting with triethyl phosphite and 4-benzyloxy-3-methoxybenzaldehyde to generate 3, 4 ', 5-trimethoxy-3'-benzyloxy stilbene, carrying out ultraviolet cyclization reaction, reacting with palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon and debenzylating with hydrogen to obtain the Chinese yam element I. The potassium iodide is used as the catalyst in the ultraviolet lamp irradiation catalytic ring closing reaction, the pure water is used as the detergent, compared with the method adopting iodine as the catalyst and adopting a sodium thiosulfate aqueous solution as the detergent, the product yield of the compound 33-4 is 75%, the yield of the compound 33-5 is 16.6%, the purity is 98.7%, and the method has the advantages of low cost, high yield, few impurities and the like.

The invention discloses a degradable environment-friendly fiber and a preparation method thereof, and relates to the field of fibers. When the degradable environment-friendly fiber is prepared, triethyl phosphite firstly reacts with 3-(2-bromoethyl) thiophene and then reacts with dimethyl terephthalate and ethylene glycol, and modified polyester is prepared; the preparation method comprises the following steps: enabling chitosan oligosaccharide to react with 4-hydroxy-3-pyridylaldehyde, thionyl chloride and 2-(dimethylaminomethyl) thiophene in sequence, so as to prepare functionalized chitosan oligosaccharide; mixing the functionalized chitosan oligosaccharide, zinc acetate and modified polyester, and performing melt spinning to obtain composite fibers; mixing thiophene, ferric chloride and trichloromethane to prepare a thiophene solution; and immersing the composite fiber in a thiophene solution, and drying to obtain the degradable environment-friendly fiber. The degradable environment-friendly fiber prepared by the invention has excellent flame retardance, antibacterial property, antistatic property and light aging resistance.

The invention relates to the technical field of aerogel microspheres, and discloses hydroxyapatite aerogel microspheres and a preparation method and application thereof.The method comprises the steps that triethyl phosphite and water are subjected to a first contact reaction, and a mixture I is obtained; the mixture I is sequentially mixed with an anionic surfactant, an ethanol solution containing an inorganic calcium source and an alkaline substance for a reaction, and hydroxyapatite aerogel microspheres are obtained; the adding amount of the alkaline substance is controlled, so that the initial pH value of the reaction system is 8-10; the inorganic calcium source is calcium nitrate and / or calcium hydrogen nitrate, and the molar ratio of the calcium element in the inorganic calcium source to the phosphorus element in the triethyl phosphite is 5: (2-4). The hydroxyapatite aerogel spherical particles are prepared by utilizing an emulsion method, and the prepared aerogel microspheres are high in specific surface area, are more regular and uniform, are low in breakage rate and have the advantage of being easier to industrialize.

The utility model relates to an efficient separation and purification device for triethyl phosphite, which comprises a first treatment tank, a second treatment tank, a first stirring mechanism and a second stirring mechanism, and is characterized in that the top of the first treatment tank is provided with a treatment liquid inlet, a cleaning water inlet and a sodium carbonate feeding port, and the bottom of the first treatment tank is connected with a tee joint; an oil-water detection sensor is arranged at an inlet of the tee joint, the tail end of an outlet pipeline of the filter is connected with an inlet of a lifting pump, and an outlet pipeline of the lifting pump is communicated with an inlet of a second treatment tank; a deflection baffle assembly is arranged in the top of the second treatment tank, a gas phase outlet is formed in the top of the second treatment tank and communicated with an inlet of a condenser, an outlet of the condenser is communicated with a product collecting tank, and the condenser is further connected with a vacuum unit. The device remarkably improves the product purification efficiency, meets various treatment requirements of products, and is good in purification effect.

The present application relates to the technical field of polymerization inhibitors, and specifically discloses a polymerization inhibitor ZJ5575 and a preparation method thereof. A preparation method of polymerization inhibitor ZJ5575, comprising the following steps: phosphite, polymerization inhibitor 701 are mixed with a catalyst, reacted at a temperature of 115-125 ° C for 10-12h, then toluene and water are added, stirred at a temperature of 35-45 ° C for 2-2.5h, stratified, and the upper organic phase is obtained, and then water is added to the organic phase again, and negative pressure distillation is performed at a temperature of 55-65 ° C, and toluene is completely removed and cooled to 22-28 ° C, centrifuged, and solids are obtained. Drying, polymerization inhibitor ZJ5575 is obtained, and the phosphite is one of triethyl phosphite or trimethyl phosphite. The preparation method of the present application can increase the yield of product polymerization inhibitor ZJ5575 to 98.58%, while significantly reducing the amount of wastewater discharge.

The utility model relates to the field of chemical separation technology discloses an on -line separation equipment of impurity for triethyl phosphite production, including support, the support upper surface fixedly connected with the reaction kettle, the inside of reaction kettle is provided with the filter assembly, the filter assembly includes filter plate, the filter plate sets up in the inside of reaction kettle, the reaction kettle outer wall fixedly connected with the clamp no.

The invention relates to the field of lubricating oil, in particular to a phenolic ester antioxidant, a lubricating oil composition and preparation and application of the phenolic ester antioxidant and the lubricating oil composition. The preparation method of the phenolic ester antioxidant comprises the following steps: mixing alkylphenol and formaldehyde at 50-55 DEG C under the protection of nitrogen to synthesize a first intermediate; mixing the first intermediate and polyethylene polyamine at 50-55 DEG C under the protection of nitrogen to synthesize a second intermediate; mixing alkylphenol and triethyl phosphite, and synthesizing a third intermediate by taking anhydrous potassium carbonate as a catalyst; and mixing the second intermediate and the third intermediate, and synthesizing the phenolic ester antioxidant by taking anhydrous potassium carbonate as a catalyst. The phenolic ester antioxidant provided by the invention has excellent oxidation resistance and detergency and dispersibility, and can reduce the paint film formation tendency when the lubricating oil is used.

The invention discloses a perfluorosulfonyl imide type proton exchange resin with a coupled multi-active center, which is obtained by grafting phosphonated polyhedral oligomeric silsesquioxane (POSS) on perfluorosulfonamide, and the specific preparation process is as follows: perfluorosulfonyl fluoride and ammonia gas react to generate perfluorosulfonamide; carrying out substitution reaction on the phosphonated POSS and triethyl phosphite to obtain an intermediate product; and carrying out Michael addition reaction on the intermediate product and perfluorosulfonylamino, and acidifying to obtain the target product. According to the perfluorosulfonyl imide type proton exchange resin with the coupled multi-element active center, the glass-transition temperature of a proton exchange membrane can be increased; meanwhile, the sulfonyl imide and the phosphonic acid group cooperatively construct a multiple proton transmission path and have rapid proton conduction capability, so that the proton exchange membrane can ensure rapid proton transmission even at a high temperature, the conductivity of the proton exchange membrane is improved, and the problem that a perfluorosulfonic acid proton exchange membrane in the prior art is relatively poor in performance under a high-temperature working condition is solved.

The present invention belongs to the field of chemiluminescence immunoassay technology, and particularly relates to a preparation method of a chemiluminescent substrate. The preparation steps are as follows: Using compound 2 as a raw material, dissolving compound 2 in carbon tetrachloride, adding a catalyst and NBS for bromination reaction to obtain compound 3; adding compound 3 to triethyl phosphite, stirring at 20-30 °C for 10-24 h to obtain compound 4; mixing compound 4 with a mixture of acetone and an aqueous sodium hydroxide solution, stirring at 20-30 °C for 10-24 h to obtain the target compound. The experimental materials and experimental conditions adopted in the present invention are relatively simple, which improves the safety factor of the experiment, reduces the experimental cost, and can form a low-cost and safe chemiluminescent substrate production line.

The utility model relates to the technical field of filtering components, and in particular to a triethyl phosphite finished product filtering device. Its technical scheme includes: a floor, a feeding pipe, a tank body, a ring cylinder and a plugging block, wherein the tank body is arranged on the floor through a supporting assembly, a sealing cover is arranged at the top opening of the tank body, the ring cylinder is fixed on the sealing cover, a microporous plate is arranged at the bottom end of the inner wall of the ring cylinder, a feeding assembly is arranged on the ring cylinder, the plugging block is arranged on the sealing cover by a driving assembly, and the plugging block is in sliding contact with the inner wall of the ring cylinder. The utility model uses a mechanical structure and physical pressure to pressurize the triethyl phosphite finished product to accelerate its filtration speed through the coordination between structures, thereby improving the production efficiency of the triethyl phosphite finished product.

The invention discloses a nanoparticle modified antibacterial fabric and a preparation method thereof, and relates to the field of fabrics. When the nano particle modified antibacterial fabric is prepared, triethyl phosphite firstly reacts with 1-(1-bromoethyl)-3, 5-bis-trifluoromethyl-benzene, then is polymerized with dimethyl terephthalate, polyethylene glycol-2000, ethylene glycol and N-methyldiethanolamine, and finally reacts with 3-bromopropionyl chloride to prepare modified polyester; the preparation method comprises the following steps: reacting 5-amino-2-sulfydryl benzimidazole with nano graphene oxide to prepare modified graphene oxide; mixing the modified polyester, the modified graphene oxide and zinc acetate, and performing melt spinning, spinning and weaving to obtain the nano particle modified antibacterial fabric. The nano particle modified antibacterial fabric prepared by the invention has flame-retardant, durable and waterproof capabilities.

This invention belongs to the field of adsorption materials technology, specifically disclosing a composite adsorption material for electronic specialty gases and its preparation method. The method includes: preparing a resin carrier by suspension polymerization using 4-chloromethylstyrene, divinylbenzene, and acrylonitrile as monomers; adding vinyl acetate after swelling to obtain composite microspheres; reacting with triethyl phosphite at 120-160℃ for 4-8 hours to obtain phosphonate-modified composite microspheres; sequentially hydrolyzing with alkaline and acidic methods to obtain functionalized resin; preparing a metal-gel solution containing zirconium and lanthanum and adjusting the pH to 3.5-4.5; adding the functionalized resin to the metal-gel solution after swelling, reacting at 40-60℃ for 3-5 hours, separating the solid and liquid phases, washing, crystallizing at 120-160℃ for 4-8 hours, and drying to obtain the final product. The material obtained by this invention constructs multiple active sites through phosphonate groups, hydroxyl groups, and metal oxides, achieving deep removal of water at the ppb level, synergistically removing light and heavy impurities, and exhibiting excellent cycle life.

The invention discloses a high-durability metal preservative and a preparation method thereof, and belongs to the technical field of metal material protection. The invention provides a metal preservative taking two brand-new modified compounds as cores. Wherein the bis (gamma-mercaptopropyl) phosphonate modified polysiloxane is prepared by hydrolyzing gamma-mercaptopropyl trimethoxy silane and then reacting the hydrolyzed gamma-mercaptopropyl trimethoxy silane with triethyl phosphite, and the bis (gamma-mercaptopropyl) phosphonate modified polysiloxane contains sulfydryl and phosphonate groups; the 1, 3-bis (2-hydroxyethyl imidazolinone) modified perfluorinated epoxy resin is prepared by esterifying perfluorooctyl epoxy resin and imidazolinone and then introducing a fluorocarbon chain, and contains an imidazolinone ring and the fluorocarbon chain. The preservative further comprises deionized water, nano aluminum oxide, benzotriazole and the like. The preparation method comprises the following steps: refluxing two modified compounds, extracting, performing esterification polymerization and the like. The product realizes long-acting corrosion inhibition through chemical adsorption of sulfydryl, phosphonate groups and metal, chelating of imidazolinone rings and water blocking of fluorocarbon chains, and the protection performance of the metal in a harsh environment is remarkably improved.

The preparation device comprises a reaction kettle, a kettle cover is arranged at the upper end of the reaction kettle, a driving part is arranged on the kettle cover, a stirring structure extending into the reaction kettle is arranged at the output end of the driving part, an injection opening I for injecting triethyl phosphate is formed in the upper end of the kettle cover, and a rotating part fixed with the driving part is arranged in the kettle cover; a plurality of exchange grooves are formed in the rotating part, interlayers slide in the exchange grooves, and the upper ends and the lower ends of the interlayers are respectively supported by triethyl phosphite and gas in the reaction kettle to keep balance. Compared with the prior art, the device has the advantages that the interlayer is driven to displace through pressure change caused by toxic gas generated in the reaction kettle, the feeding amount of triethyl phosphite is dynamically changed, and when the reaction kettle reacts violently and the gas pressure is increased, the feeding amount is automatically reduced, the hydrogen phosphide generation rate is reduced from the source, and the yield of hydrogen phosphide is increased. The gas quantity is always within the treatment capacity range of the purification system, and the leakage risk of highly toxic gas is avoided.

The invention belongs to the technical field of synthesis of antioxidants 618, and discloses a synthesis method of an antioxidant 618. The catalyst comprises an amination carrier and double active components loaded on the carrier, the carrier is an amination ZIF-8 metal organic framework, a first active component is silicotungstic acid H4SiW12O40, a second active component is transition metal ions, and the transition metal ions are selected from one or more of Cu < 2 + >, Mn < 2 + > or Cr < 3 + >; the catalyst can be used for catalyzing two-step ester exchange reaction of triethyl phosphite, pentaerythritol and octadecanol which are used as raw materials to synthesize the antioxidant 618. The catalyst provided by the invention is high in catalytic efficiency, relatively mild in catalytic reaction condition, stable in structure and capable of being efficiently recycled for multiple times; and the obtained product antioxidant 618 is high in selectivity and excellent in quality.

This invention relates to the field of pharmaceutical chemical synthesis technology, specifically disclosing a method for preparing a stable cefixime side-chain acid active ester. The invention involves adding dibenzothiazole disulfide, cefixime side-chain acid, an organic amine, and triethyl phosphite to a reaction solvent for a condensation reaction; then adding a crystallization solvent to the reaction system, cooling to allow crystallization, separating the solid and liquid phases, and washing the resulting solid with a phosphate buffer to obtain the cefixime side-chain acid active ester; the particle size of the dibenzothiazole disulfide is D90 = 20 μm~45 μm; the pH of the phosphate buffer is neutral. This invention couples the condensation reaction and crystallization process into one step, synergistically adding an organic amine and triethyl phosphite, purifying with a specific neutral phosphate buffer, and controlling the particle size of the raw material DM, achieving product quality assurance throughout the entire process from reaction source to purification. Accelerated testing has confirmed that the sample exhibits high stability.

This invention discloses a sodium methoxide preparation vessel, preparation system, and method for preparing fluorescent whitening agents, belonging to the chemical industry. It includes the following apparatus: an esterification vessel, a preparation vessel, a distillation vessel, a sodium methoxide preparation vessel, a coarse powder crystallization vessel, a dissolving vessel, and a fine powder crystallization vessel. The sodium methoxide preparation vessel includes shock-absorbing components and a shock-absorbing drying assembly to achieve rapid temperature control within the reaction vessel without affecting its stirring and shock-absorbing functions. The process includes the following steps: adding biphenyl dichlorobenzyl and triethyl phosphite to the esterification vessel under nitrogen atmosphere, heating, stirring, and reflux; adding DMF, sodium o-sulfonate benzaldehyde, and sodium methoxide to the resulting ester; maintaining the temperature for a certain time; adding concentrated sulfuric acid; stirring, heating, and distilling; adding industrial salt and cooling; and then dissolving, filtering, cooling, and pressure filtration. This invention allows for the recycling of materials and byproducts, saves energy, reduces waste emissions, and achieves industrial recycling.

The invention relates to the technical field of organic synthesis, particularly discloses a preparation method based on triethyl phosphite, and aims to solve the problems of insufficient performance of an acid-binding agent and poor mass and heat transfer performance of a tank reactor in a traditional process and realize technical upgrading. The method is characterized in that a novel acid-binding agent is matched with a micro-channel reactor, and triethyl phosphite is continuously produced through processes such as precise temperature control, online FTIR (Fourier transform infrared spectroscopy) monitoring of a reaction process, sectional distillation and rectification and the like; according to the method, generation of solid salt byproducts is avoided, the post-treatment procedure is simplified, the purity of the finished product reaches 98.7% or above, the yield exceeds 93.5%, and the method has environmental protection property and economical efficiency, is suitable for multiple fields such as high-end medicines and pesticides and has remarkable industrial application value.

The utility model relates to a triethyl phosphite synthesis kettle with high reaction yield, which comprises a synthesis kettle body and is technically characterized in that a rotatable vertical pipe is arranged in the center of the synthesis kettle body, and the upper end and the lower end of the rotatable vertical pipe are connected with a first heat exchange medium outlet pipeline and a first heat exchange medium inlet pipeline through an upper rotating joint and a lower rotating joint; a heat exchange interlayer is arranged on the periphery of the synthesis kettle body, a second heat exchange medium inlet pipeline is arranged at the bottom of the heat exchange interlayer, a second heat exchange medium outlet pipeline is arranged at the top of the heat exchange interlayer, a stirring paddle is arranged at the lower part of the rotatable vertical pipe, and a plurality of first conical material blocking discs with narrow upper parts and wide lower parts are arranged at the upper part of the rotatable vertical pipe; the upper part of the inner side wall of the synthesis kettle body is provided with a plurality of second conical material blocking discs with narrow upper parts and wide lower parts, the first conical material blocking discs and the second conical material blocking discs are arranged in a staggered manner, and a continuous S-shaped material ascending channel is formed at the upper part of the synthesis kettle body. According to the utility model, the transfer timeliness of high heat generated by material reaction is further improved, and the generation of side reaction is further reduced, so that the product yield is improved.

The invention discloses a synthesis method of 4-(diacetoxyphosphoryl)-2-methyl-2-ethyl crotonate and application of the 4-(diacetoxyphosphoryl)-2-methyl-2-ethyl crotonate, and relates to the technical field of fine chemical engineering. The synthesis method comprises the following steps: carrying out condensation reaction on halogenated acetaldehyde dimethyl acetal and ethyl propionate to form a first compound; removing methanol from the first compound to form a second compound; and carrying out a reaction on the second compound and triethyl phosphite to obtain the ethyl 4-(diacetoxyphosphoryl)-2-methyl-2-butenoate. According to the present invention, the new 4-(diacetoxyphosphoryl)-2-methyl-2-ethyl crotonate synthesis route is provided, the halogenated acetaldehyde dimethyl acetal is adopted as the starting material, the synthesis route is simple, the raw material is simple and easy to obtain, the 4-(diacetoxyphosphoryl)-2-methyl-2-ethyl crotonate yield is high, and the product yield can achieve more than 88%.

The invention provides a hole transport material containing a polyphosphoric acid anchoring group, a synthesis method and application thereof, and the synthesis method of the hole transport material containing the alkyl polyphosphoric acid anchoring group comprises the following steps: S1, taking a benzodithiophene derivative with an alkyl chain as an initial compound; deprotonating and reacting with dibromoalkane to obtain a brominated alkyl compound; s2, reacting the brominated alkyl compound with triethyl phosphite to obtain a diethyl phosphonate compound; s3, hydrolyzing the diethyl phosphonate compound through trimethylbromosilane to obtain a hole transport material containing a phosphoric acid anchoring group; wherein the alkyl chain is C1-20 alkyl, and the benzodithiophene derivative has a plurality of modifiable sites so as to introduce single-side or double-side phosphate groups. The invention solves the problem that the core conjugate unit of the current self-assembled hole transport material has few modifiable sites and limits the optimization space of the material.

The invention discloses damp-heat aging resistant copolyester, a preparation method and application, and belongs to the field of macromolecular polyester materials. The damp-heat aging resistant copolyester comprises the following raw materials in parts by mass: 100 parts of terephthalic acid; 26 to 30 parts of 2, 3-epoxy propyl acrylate; 2 to 4 parts of 1, 5-pentanediol; 2 to 4 parts of 1, 4-butanediol; 50 to 60 parts of ethylene glycol; 0.6-1 part of nano clay modified by organic quaternary ammonium salt; 0.04 to 0.1 part of tetrabutyl titanate; 0.04 to 0.1 part of dried and modified ethylene glycol antimony; and 0.02 to 0.1 part of triethyl phosphite. By adding three types of modified components for copolymerization modification, the prepared PET polyester chip has the advantages of excellent damp-heat aging resistance and high-strength machine tensile property, and can be used for preparing the damp-heat aging resistant BOPET composite film.

This invention relates to a triphenylamine-carbazole-phosphonic acid derivative, its preparation method, and its applications, belonging to the field of optoelectronic materials and devices technology. The preparation method of the triphenylamine-carbazole-phosphonic acid derivative includes: mixing compound 1a, compound 2a, a catalyst, and a mixed solvent under an inert gas atmosphere, followed by heating to obtain intermediate M0; dissolving intermediate M0 in dibromide, then adding a phase transfer catalyst and a base, and heating to obtain intermediate M1; dissolving intermediate M1 in triethyl phosphite, and heating to obtain intermediate M2; and hydrolyzing intermediate M2 to obtain the final product. Perovskite-based solar cells using the triphenylamine-carbazole-phosphonic acid derivative prepared according to this invention as the hole-selective contact layer can achieve a photoelectric conversion efficiency of >24.8%, which is superior to cells using traditional 2PACZ as the hole-selective contact layer.

The utility model provides a chemical rectification device, and relates to the technical field of chemical rectification, the chemical rectification device comprises a stock solution filter box, the top of the stock solution filter box is fixedly provided with a heating box, the left side of the stock solution filter box is fixedly provided with a mounting rack, one side of the mounting rack is fixedly provided with a motor, and the output end of the motor is fixedly provided with a first screw rod; a plurality of limiting rods are fixedly mounted on the inner side of the stock solution filtering box and the inner side of the mounting frame, a filter screen plate can be sealed through a triethyl phosphite filtering and rectifying assembly and a sealing rubber ring, and liquid to be rectified can only enter the inner side of the heating box through the filter screen plate to be heated; the filter screen plate can filter impurities, the heating box can only heat pure liquid, steam generated after heating can enter the condenser through the steam discharge pipeline to be cooled, condensed liquid can be discharged through the liquid discharge pipe, and the rectification effect of the device is good.

The present invention provides a triethyl phosphite preparation method, which comprises: adopting phosphorus trichloride, ethanol and an organic solvent as raw materials, and carrying out an esterification reaction under a continuous vacuumizing condition to prepare triethyl phosphite, the purity of the product triethyl phosphite prepared by the preparation method can reach 98.7% or above, the yield can reach 94.5% or above, no acid-binding agent needs to be added, generation of a large amount of waste salt is avoided, and washing and waste salt treatment are not needed, so that the technological process is shortened, the production cost is reduced, and the method is suitable for large-scale industrial production of triethyl phosphite.

This invention provides a flame-retardant nylon fiber and its preparation method. The flame-retardant nylon fiber is composed of nylon resin and 3-8 wt% of guanidine monochlorotriazine phosphite triethyl ester modifier. The modifier is chemically bonded to the nylon resin molecular chain. During synthesis, the dried nylon resin and the modifier are melt-blended at 250-280°C under nitrogen protection, and the finished product is obtained by extrusion, stretching, and heat setting. This invention, through a phosphorus-nitrogen synergistic flame-retardant mechanism, endows the nylon fiber with long-lasting and highly efficient flame-retardant properties without affecting its original strength, hand feel, breathability, moisture permeability, and skin-friendliness. The flame-retardant components are not easily lost, and the process is environmentally friendly and non-toxic. It is suitable for fire-fighting clothing, protective clothing, military textiles, home decoration fabrics, and other applications, solving the problems of difficulty in balancing flame-retardant efficiency and fiber performance, poor durability, and insufficient environmental protection in existing technologies.

The invention belongs to the technical field of medicines, and particularly relates to a preparation method of cefixime side chain acid active ester based on a supergravity reaction, which comprises the following steps: S1, sequentially adding an organic solvent, cefixime side chain acid, a catalyst and dibenzothiazyl disulfide to the outer side of a rotating packed bed of a supergravity reactor through a liquid inlet, starting the supergravity reactor, and reacting for 2-4 hours; adding a first batch of triethyl phosphite into the middle part of a rotating packed bed of the supergravity reactor through a feeding spray pipe, and carrying out a first-stage supergravity reaction; s2, carrying out a second-stage supergravity reaction; s3, carrying out a third-stage supergravity reaction; and S4, after the third-stage supergravity reaction, obtaining a cefixime side chain acid active ester crude product, and separating and drying to obtain the cefixime side chain acid active ester. According to the present invention, the power energy consumption is low, the methanol is not required to refine after the cefixime side chain acid active ester is synthesized, the loss is reduced, and the obtained product has advantages of high purity, high yield and short reaction time.

The application discloses a preparation method of a metal-loaded carbon catalyst and application of the metal-loaded carbon catalyst in synthesis of ynamines, and an expression formula of the metal-loaded carbon catalyst is M@C-T or M / L@C-T, wherein M is any one or more than one of metals Cu, Ni, Fe or Co; L is any one or more than one of bipyridine, triphenylphosphine, o-phenanthroline, tributyl phosphate or triethyl phosphite; C represents carbon; and T is temperature, and T is 300 DEG C to 800 DEG C. Through construction of the carbon catalyst and a suitable catalytic system, the application realizes preparation of ynamine derivatives by catalyzing reaction of O-acetyloxime and a terminal alkyne.