251 results about "Diethyl ester" patented technology

The invention discloses a preparation method of antistatic modified chinlon filaments, and relates to the field of chinlon filaments. When the antistatic modified chinlon filament is prepared, (formylmethyl) diethyl phosphate and 1-aminopyrrole react to prepare pyrrole diethyl phosphate; reacting the hydroxylated multi-walled carbon nanotube with pyrrole diethyl phosphate to obtain a modified multi-walled carbon nanotube; the preparation method comprises the following steps: reacting 2, 2 '-bipyridine-5, 5'-dicarboxylic acid with 2-amino-5-nitrophenol, and then reducing to obtain a benzoxazole diamine monomer; then, adipic acid, 1, 5-diaminopentane and a benzoxazole diamine monomer are subjected to a reaction, and modified polyamide is prepared; uniformly mixing the modified polyamide, the modified multi-walled carbon nanotubes, pyrrole, ferric trichloride and copper chloride, and performing melt spinning to obtain the antistatic modified polyamide filament. The antistatic modified chinlon filament prepared by the invention has excellent antistatic, flame-retardant, anti-aging and mechanical properties.

The invention discloses low-drunkenness type Baijiu distiller's yeast and a preparation method and application thereof. The prepared distiller's yeast can be used for producing baijiu, the physical and chemical indexes of the baijiu are good, fusel oil is reduced by 30%-57%, the metabolism speed of yeast is controlled by controlling the saccharification speed, and the generation of the fusel oil is reduced; meanwhile, lactic acid bacteria and bacillus subtilis of the distiller's yeast and bacteria cultured in a high-temperature stage can effectively inhibit the path of fusel oil metabolized by yeast, generation of fusel oil is further reduced, total ester and total acid are slightly increased basically, the content of total dibasic acid is increased by 10 times, and the content of dibasic acid diethyl ester is increased by 2 times. After the wine liquid is aged, drunkenness detection is carried out, and the comprehensive drunkenness Q is 0.6815-0.8325 and is far lower than a variety of commercially available white spirits (the comprehensive drunkenness is greater than or equal to 1).

The invention belongs to the technical field of recycled polyester, and particularly relates to a waste polyester textile recycling method which comprises the following steps: decolorizing colored waste polyester textiles by adopting a decolorizing agent which is more than one of dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate; the depolymerization agent is adopted to depolymerize the decolored polyester textile to obtain the terephthalate, and the depolymerization rate of the decolored polyester textile is 98.0-100%; firstly, terephthalate is converted into DMT, and then DMT, ethylene glycol, a catalyst and a functional additive are subjected to a repolymerization reaction to obtain regenerated PET. According to the method, a process of decoloring and depolymerizing sequentially is adopted, and decoloring and depolymerizing are coordinated, so that the process is simplified, the energy consumption and pollution are reduced, and the economical efficiency and sustainability of waste polyester textile recycling are improved.

The invention belongs to the technical field of regenerated polyester, and particularly relates to a waste cotton-polyester blended fabric recycling method which comprises the following steps: firstly, decolorizing a colored waste cotton-polyester blended fabric by adopting a decolorizing agent, then mixing a depolymerizing agent, isosorbide dimethyl ether, a first catalyst and the decolorized cotton-polyester blended fabric, and then carrying out depolymerization reaction, the decolorizing agent and the depolymerizing agent are more than one of dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate, and the temperature of the depolymerizing reaction is 130-150 DEG C; washing the separated cotton fibers with water, and screening to remove residual polyester powder on the surfaces; firstly, terephthalate is converted into DMT, and then DMT, ethylene glycol, a second catalyst and a functional additive are subjected to a repolymerization reaction to obtain regenerated polyethylene glycol terephthalate. According to the method, depolymerization and polyester cotton separation processes are ingeniously fused, so that the operation steps are simplified, the energy consumption is reduced, and the purity of a depolymerization product is also improved.

The invention belongs to the technical field of regenerated polyester, and particularly relates to a waste polyester-spandex blended fabric recovery method, which comprises the following steps: carrying out decoloration and depolymerization on a colored waste polyester-spandex blended fabric by using a treating agent; and depolymerizing the decolored polyester fabric by using a depolymerizing agent to obtain the terephthalate. Wherein the treating agent is more than one of dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate; the depolymerizing agent is the same as the treating agent; the depolymerization rate of spandex in the waste polyester-spandex blended fabric is 98-100%, and the decolorization rate of the waste polyester-spandex blended fabric calculated according to the K / S value is 98% or above. The method breaks through the bottlenecks of high pollution and high energy consumption of the traditional process, and solves the contradiction that component separation and decoloration are difficult to take into account in the recovery process of the blended fabric.

The application belongs to the technical field of regenerated polyester, and particularly relates to a recycling method of waste polyester textiles, which comprises the following steps: decolorizing colored waste polyester textiles by using a decolorizing agent, wherein the decolorizing agent is one or more of dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate; depolymerizing the decolorized polyester textiles by using a depolymerizing agent to obtain terephthalate, wherein the depolymerization rate of the decolorized polyester textiles is 98.0-100%; converting the terephthalate into DMT first, and then performing a re-polymerization reaction on the DMT, ethylene glycol, a catalyst and a functional additive to obtain regenerated PET. The application adopts a process of decolorizing first and then depolymerizing, and the decolorizing and depolymerizing are coordinated, so that the process is simplified, the energy consumption and pollution are reduced, and the economy and sustainability of the recycling of waste polyester textiles are improved.

The invention provides a method for synthesizing diethyl adipate through dynamic covalent chemical regulation. Comprising the following steps: S1, sequentially adding 80-120g of adipic acid, 160-240mL of absolute ethyl alcohol, 5-8g of a difunctional dynamic regulation and control carrier, 2-4g of a ternary composite catalyst, 1-2g of a synergistic additive and 100-150mL of a mixed solvent consisting of cyclohexane and methylbenzene into a 500mL four-neck flask provided with a thermometer, a water segregator and a pH sensor, and adjusting the initial pH value to 8.0-8.5; stirring and reacting for 6 to 8 hours at the rotating speed of 450 to 500r / min under the condition of 70 to 75 DEG C; and S2, after the reaction is finished, cooling to 25 DEG C, separating and recovering the bifunctional dynamic regulation and control carrier and the ternary composite catalyst, introducing CO2 into the filtrate to regulate the pH value to 5.0-5.5, releasing the captured moisture, and carrying out reduced pressure distillation under the conditions of 80-90 DEG C and-0.08 MPa to obtain diethyl adipate. By means of the rare earth ion-carbon quantum dot-ionic liquid ternary composite catalyst, efficient catalysis under the strong acid-free condition is achieved, and the catalyst recovery rate and the product purity are greatly improved.

The invention relates to a secondary battery and an electronic device. Specifically, the secondary battery provided by the invention comprises a positive electrode, a negative electrode and an electrolyte, the negative electrode comprises a negative electrode current collector and a negative electrode material arranged on the negative electrode current collector, the particle size of the negative electrode material satisfies Dv10: Dv50: Dv99 = 1: (1.5-2.5): (5-6), the electrolyte comprises diethyl carbonate, ethylene carbonate and 1, 3-propane sultone, and relative to 100 parts by mass of the electrolyte, the particle size of the negative electrode material is 1: (1.5-2.5): (5-6). The content of the ethylene carbonate is 15-30 parts by mass, the content of the diethyl carbonate is 0.5-1.5 parts by mass, the content of the ethylene carbonate is 15-30 parts by mass, and the content of the 1, 3-propane sultone is 0.01-0.5 parts by mass. According to the invention, the over-current and over-temperature safety of the secondary battery can be improved.

The reaction kettle for the reaction preparation of the diethyl acetamidomalonate comprises a kettle body, a raw material dropwise adding assembly, a linkage structure, a stirring structure and an auxiliary cooling assembly. In order to solve the problems that when an ordinary reaction kettle is used for oximation reaction in diethyl acetamidomalonate reaction preparation, the reaction is violent and the reaction is not uniform and insufficient due to the fact that raw materials are mixed at a time, a raw material dropwise adding assembly is designed, the raw materials can be conveniently and gradually dropwise added into a kettle body through the raw material dropwise adding assembly, and the reaction efficiency is greatly improved. The reaction can be carried out step by step, the problem that the reaction is too intense is avoided, further, a stirring structure is designed, and automatic stirring and mixing can be carried out through the stirring structure during the reaction, so that the reaction is sufficient.

The invention discloses fireproof flame-retardant phenolic resin and a preparation method thereof, and relates to the technical field of high polymer materials. When the fireproof flame-retardant phenolic resin is prepared, firstly, alkali lignin is depolymerized in a lithium bromide solution, and depolymerized lignin is prepared; carrying out multi-component reaction on the depolymerized lignin, amino-terminated polydimethylsiloxane, isonitrile diethyl methylphosphate and glacial acetic acid to prepare modified lignin; the preparation method comprises the following steps: carrying out reaction modification on montmorillonite and diisocyanate to prepare isocyanate modified montmorillonite; the isocyanate modified montmorillonite and 3-aminopropyltriethoxysilane are subjected to a reaction, and modified montmorillonite is prepared; and polymerizing phenol with the modified lignin, paraformaldehyde and modified montmorillonite, and discharging to obtain the fireproof flame-retardant phenolic resin. The prepared fireproof flame-retardant phenolic resin has the advantages of flame retardance, good toughness, high strength and aging resistance.

The invention discloses a wide-voltage wide-temperature-range sodium-ion battery electrolyte and a preparation method and application thereof, and belongs to the technical field of sodium-ion battery electrolytes.The wide-voltage wide-temperature-range sodium-ion battery electrolyte comprises sodium salt, an organic solvent and an additive, the organic solvent is selected from one or more of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, dimethyl carbonate, diethyl carbonate, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether and triethylene glycol dimethyl ether, and the additive is selected from one or more of fluoroethylene carbonate, allyl-1, 3-propane sultone, 1, 3-propylene sultone, 1, 3-propylene sultone and 1, 3-propylene sultone. The additive is one or more of 1, 3-propyl sultone, methylene methane disulfonate, ethylene sulfate, trifluoromethanesulfonic anhydride, pentaerythritol bicyclic sulfate, tri (trimethylsilane) phosphate, tri (trimethylsilane) phosphite, tri (trimethylsilane) borate, acesulfame sodium and aluminum trifluoromethanesulfonate, and the additive is one or more of 2, 3-propylene sultone, methylene methane disulfonate, ethylene sulfate, trifluoromethanesulfonic anhydride, pentaerythritol dicyclosulfate, tri (trimethylsilane) phosphate, tri (trimethylsilane) phosphite, tri (trimethylsilane) borate, tri (trimethylsilane) phosphate and tri (trimethylsilane) borate. The electrolyte provided by the invention not only keeps high coulombic efficiency at low temperature, but also has good cycle stability at high temperature.

The invention discloses a medical antibacterial antistatic modified polyester cotton type fabric and a preparation method thereof, and relates to the field of fiber fabrics. When the medical antibacterial and antistatic modified polyester cotton fabric is prepared, pretreated lignin and p-aminosalicylic acid react to prepare pre-modified lignin; reacting the pre-modified lignin, aniline and p-aminosalicylic acid to obtain modified lignin; the preparation method comprises the following steps: reacting methyldiethanolamine with diethyl chloromethylphosphate to prepare an antibacterial flame-retardant monomer; terephthalic acid, ethylene glycol and the antibacterial flame-retardant monomer react to prepare modified polyester; the modified polyester and the modified lignin are extruded by an extruder and then spun and woven into the fabric. The medical antibacterial anti-static modified polyester cotton fabric prepared by the invention has good anti-static, flame-retardant, antibacterial and anti-light aging properties.

A metal ion cell that includes a positive electrode with a cathode active material configured to store and release metal ions: a negative electrode with an anode active material that operates at a potential that is not less than 0.6 volts (V) versus Li / Lit; and an electrolyte that incorporates one or more (e.g., lithium) metal salts and a solvent mixture that includes 3-methoxypropionitrile (MPN) and at least one linear carbonate. The MPN in the electrolyte may have a mass ratio of ≥0.1 as compared to the at least one linear carbonate. The at least one linear carbonate includes one or more of dimethyl carbonate (DMC), diethyl carbonate (DEC), or ethyl methyl carbonate (EMC). The solvent mixture may also include a mixture of carbonates, such that the mass percentage of the linear carbonate ranges from 10% to 90% compared to the overall mass of the mixture of carbonates.

The invention relates to the technical field of flame retardance, and discloses a reaction type graphene flame-retardant modified polystyrene plastic, acryloyloxy diethyl phosphate of graphene and styrene are polymerized to obtain reaction type graphene grafted polystyrene, and then the reaction type graphene grafted polystyrene is compounded with impact polystyrene to obtain the reaction type graphene flame-retardant modified polystyrene plastic. The reaction type graphene flame-retardant modified polystyrene plastic is obtained, acryloyloxy diethyl phosphate bonded on the surface of graphene serves as a reaction type flame retardant and is subjected to graft polymerization with styrene, graphene and polystyrene have higher interface bonding force, compatibility of the graphene and the polystyrene is better, and the reaction type graphene flame-retardant modified polystyrene plastic is obtained. According to the present invention, the influence of the reaction type graphene on the use performance of the polystyrene is avoided, the acryloyloxy diethyl phosphate small molecules on the surface of the graphene are adopted as the phosphorus-containing flame retardant, can be decomposed during combustion to produce the phosphoric acid compound, can promote the water absorption carbonization, and can be compounded with the graphene to form the continuous carbon barrier layer so as to achieve the good synergistic flame retardation effect;

The present disclosure provides an electrolyte for a lithium metal battery, containing a lithium salt, a solvent and a diluent including 1,2-difluorobenzene, wherein the lithium salt comprises one or more selected from the group consisting of lithium bis(fluorosulfonyl)imide (LiFSI), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), and lithium hexafluorophosphate (LiPF6), the solvent comprises one or more selected from the group consisting of dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), ethylene carbonate (EC), and propylene carbonate (PC).

The invention belongs to the technical field of asphalt production, and discloses high-elasticity modified asphalt which comprises a matrix, a plasticizer and a stabilizer, the plasticizer is selected from at least one of dioctyl phthalate, diethyl sebacate, diethyl adipate, dioctyl adipate, alkyl sulfonate and furfural extract oil; the stabilizer is selected from at least one of sulfur, tetramethylthiuram disulfide, maleic anhydride and m-phenylenediamine, the swelling capacity of SBS in the asphalt is improved to a certain extent through the plasticizer, and meanwhile, the stabilizer is used for resisting oxidative denaturation of the asphalt in the long-term use process; in addition, the invention further discloses a preparation method of the high-elasticity modified asphalt.

The low-temperature electrolyte comprises an organic solvent, a lithium salt and an additive, and the mass percentage ratio of the organic solvent to the lithium salt to the additive is (70-90): (5-20): (0.2-3); the organic solvent is composed of cyclic carbonate, chain carbonate and chain carboxylate, the mass percentage of the cyclic carbonate, the chain carbonate and the chain carboxylate is 10-20: 10-30: 10-80, the cyclic carbonate is one or two of ethylene carbonate and propylene carbonate, the chain carbonate is one or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, dipropyl carbonate and methyl propyl carbonate, and the chain carboxylate is one or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, dipropyl carbonate and methyl propyl carbonate. The lithium salt is one or more of lithium hexafluorophosphate, lithium perchlorate and lithium tetrafluoroborate. Compared with a single auxiliary additive, the low-temperature performance of the electrolyte can be remarkably improved by combining the amino-containing nicotinonitrile compound with the auxiliary additive according to the proportion.

This invention provides an amino-modified copper-silicon catalyst, its preparation method, and its application, belonging to the field of catalyst technology. The copper oxide particles in the copper-silicon catalyst provided by this invention have a small particle size and high dispersibility on the silica surface, which can significantly improve the catalytic activity of the copper-silicon catalyst, thereby improving the selectivity of ethanol in the hydrogenation of diethyl oxalate. Example results show that, at 180℃ and a hydrogen-to-ester ratio of 25, the copper-silicon catalyst provided by this invention achieves a diethyl oxalate conversion rate of 96.66% and an ethanol selectivity of 84.72% for diethyl oxalate. Furthermore, after 270 hours of stable reaction, the diethyl oxalate conversion rate still reaches 94.7%, and the ethanol selectivity still reaches 66.29%, indicating that the copper-silicon catalyst does not show significant deactivation.

The invention discloses a battery grade methyl ethyl carbonate / diethyl carbonate synthesis process, which adopts a transesterification method, and dimethyl carbonate (DMC) and ethanol react under the catalysis of sodium methoxide to generate methyl ethyl carbonate (EMC), diethyl carbonate (DEC) and byproduct methanol. High-purity battery-grade EMC and DEC products are obtained through the steps of reactive distillation, azeotrope separation, methanol refining, catalyst carbonization removal, crude EMC / DEC separation, EMC light component removal, industrial-grade EMC refining, battery-grade EMC refining, industrial-grade DEC refining, battery-grade DEC refining and the like. The method has the advantages of simple process flow, low energy consumption, easiness in product separation, high product purity and the like, and is suitable for large-scale production of battery-grade carbonate products.

The application discloses a preparation method of a key intermediate of dapagliflozin, and belongs to the technical field of preparation of medical intermediates. The preparation method of the key intermediate of dapagliflozin comprises the following steps: 1, 1-ethoxy-4-methylbenzene is prepared by using p-cresol, sodium hydroxide and diethyl sulfate; 2, (4-ethoxybenzyl) phenyl sulfide is prepared by using 1-ethoxy-4-methylbenzene, thiophenol, a palladium catalyst, an alkali and an oxidant; 3, 1-benzyl-4-ethoxybenzene is prepared by using (4-ethoxybenzyl) phenyl sulfide under a hydrogen atmosphere; 4, 4-ethoxy-2'-chlorobenzhydrol is prepared by carrying out chlorination reaction on 1-benzyl-4-ethoxybenzene; and 5, 5-bromo-2-chloro-4'-ethoxybenzhydrol is prepared by carrying out bromination reaction on 4-ethoxy-2'-chlorobenzhydrol. The yield and purity of 5-bromo-2-chloro-4'-ethoxybenzhydrol prepared by the method are higher, the process is safer, and the production cost is reduced.

The present application relates to the technical field of treatment of maleic acid-containing wastewater, and in particular to a method for resource-based treatment of diethyl maleate process wastewater, comprising: first subjecting diethyl maleate process wastewater to a hydrolysis reaction and dealcoholization treatment to obtain dealcoholized wastewater; then mixing an appropriate amount of maleic anhydride with the dealcoholized wastewater to synthesize a sodium polyepoxysuccinate solution, which is a scale inhibitor with dual effects of scale inhibition and corrosion inhibition and has a huge market demand. The treatment process steps of the present application are simple, and no high-cost environmental protection treatment equipment and material investment are required. The obtained product can be sold directly in liquid form, and no secondary wastewater and waste gas are generated throughout the process, thereby achieving high environmental protection and good economic efficiency of diethyl maleate process wastewater treatment.

The invention discloses an electrolyte for a lithium battery, which comprises an organic solvent, a lithium salt and an additive, and the mass percentage ratio of the organic solvent to the lithium salt to the additive is (70-90): (5-20): (0.2-10); the organic solvent is composed of cyclic carbonate and chain carbonate in a mass ratio of (10-30): (70-90); the lithium salt is one or more of lithium hexafluorophosphate, lithium perchlorate and lithium tetrafluoroborate; the additives comprise a high-temperature stabilizer, an antioxidant and a film-forming accelerant, the cyclic carbonate is one or two of ethylene carbonate and propylene carbonate, and the chain carbonate is one or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, dipropyl carbonate and methyl propyl carbonate. By optimizing the components of the electrolyte, the stability of the electrolyte at a high temperature is improved, and decomposition and side reactions are reduced, so that the performance of the battery in a high-temperature environment is improved, and the cycle life of the battery in a high-temperature environment is prolonged.

The present invention relates to a method of adding an isocitrate lyase specific inhibitor to a lactic acid fermentation process to block the production of succinic acid as a byproduct of fermentation. The specific inhibitor includes a combination of one or more of glycolic acid methyl ester, malonic acid dimethyl ester, hydroxymalonic acid diethyl ester, 3-nitropropionic acid ethyl ester, mercuric chloride, or 5,5'-dithiobis(2-nitrobenzoic acid) to effectively reduce the amount of succinic acid in the lactic acid.

The invention discloses the field of organic electronic materials, and particularly discloses a chain terminating molecule for straight-chain polyphosphocarbazole and a polymerization terminating method. The chain termination molecule is a carbazole derivative containing boronic acid pinacol ester, the core structure is'carbazole matrix-linking group-diethyl phosphate group ', and the linking group can be a butyl chain or a benzene ring; after a chain termination molecule is synthesized through a three-step reaction, a Suzuki coupling reaction is utilized to completely replace a residual Br site of straight-chain polyphosphocarbazole, and polymerization termination is realized. The bromine residual quantity of the product is less than or equal to 0.01 wt%, the molecular weight is stabilized at 6-7 monomeric units, and the molecular weight change rate is less than or equal to 5% after the product is dried and stored at 25 DEG C for 6 months; when the material is used as a hole transport layer, the laboratory small-area film thickness deviation is less than or equal to 10%, the corresponding perovskite assembly efficiency is greater than or equal to 23%, the 1000-hour attenuation rate is less than or equal to 15%, the defects of self-agglutination, poor stability and device performance fluctuation of the existing material are solved, the process is simple, and industrialization is easy.

The invention provides a synthesis method of 1-methyl-L-histidine, which comprises the following steps: firstly, carrying out methylation reaction on a compound 1 and N, N-dimethylformamide dimethyl acetal to obtain a compound 3; the compound 3 and NCS are subjected to a chlorination reaction, and a compound 4 is obtained; then reacting the compound 4 with diethyl acetamidomalonate to obtain a compound 5; then carrying out hydrolysis decarboxylation on the compound 5 to obtain a compound 6; and finally, splitting the compound 6 by using acetyl hydrolase to obtain a chiral compound 7 (namely 1-methyl-L-histidine). The synthesis route is short, the raw materials are cheap, the production cost can be reduced, the product yield and purity are high, and large-scale industrial production is facilitated.

The invention discloses a tetrazine probe synthon and a preparation method and application thereof.The preparation method comprises the following steps that under the inert atmosphere, diethyl cyanomethylphosphonate, 3-hydroxypropionitrile, 3-mercaptopropionic acid and hydrazine hydrate are mixed and then react at the room temperature, a sodium nitrite solution is added after the reaction is finished, then acid is continuously added till the reaction system reaches acidity, and a tetrazine probe synthon product is obtained; continuously reacting to obtain an intermediate; and dissolving the intermediate in a solvent in an inert atmosphere, adding triethylamine, slowly adding methanesulfonyl chloride, and reacting at room temperature to obtain the tetrazine probe synthon shown in the formula I. The invention further discloses a preparation method of the tetrazine probe synthon. The tetrazine probe synthon provided by the invention can perform series Heck reaction and HWE reaction, so that controllable combination of functional groups on two sides of a tetrazine coupling probe is realized under mild reaction conditions, and the functional groups on two sides are designed according to actual requirements to regulate and control photophysical properties of the probe. A brand new way is provided for developing a high-performance biological orthogonal fluorescent probe.

The application discloses a toughened composite polyurethane impact-resistant material based on dynamic covalent bond energy regulation, and belongs to the technical field of polyurethane materials. A double dynamic covalent network containing DA bonds and disulfide bonds is constructed by reacting polyurethane prepolymer, furfurylamine, cystine diethyl ester and bismaleimide, then nano molybdenum disulfide is modified by silane, then a metal-polyphenol / polymer composite interface layer is constructed on the surface of aramid fiber by tannic acid-iron complex and polyethyleneimine, finally, the components are mixed, impregnated and hot-pressed to obtain the composite polyurethane material. The application effectively dissipates impact energy through the reversible rupture and recombination of dynamic covalent bonds, and enhances the interfacial bonding force between components by using multiple interface modification, so that the material has excellent impact resistance, high strength, high ductility and efficient self-repairing function, solves the problems of easy damage of the interface of traditional composite materials, insufficient impact resistance and irreversible damage, and has wide application prospect in the fields of safety protection and buffer components.

The invention discloses a benzoxphosphine ligand and a complex and application thereof. The structure of the benzoxphosphine ligand is shown as a formula (I), in the formula (I), R1 is alkyl or aryl substituted oxazolidinyl or imidazoline, R2 is alkyl and / or aryl, and R3 is at least one of fluorine, carbazolyl and 2, 6-dimethoxyphenyl. According to the benzoxphosphine ligand disclosed by the invention, the metal iridium complex can be used as a catalyst to be applied to an asymmetric hydrogenation reaction of alpha-phenyl vinyl diethyl phosphate, and has excellent activity and relatively high enantioselectivity; moreover, the benzoxphosphine ligand disclosed by the invention can be directly synthesized from simple and easily available chiral aldehyde, and the preparation method is simple and easy to operate.

The invention relates to a waterborne polyurethane emulsion as well as a preparation method and application thereof. The preparation raw materials of the waterborne polyurethane emulsion comprise the following components: an isocyanate monomer, flame-retardant polyether polyol, polydimethylsiloxane, a hydrophilic chain extender and a small molecular alcohol chain extender. The flame-retardant polyether polyol is a polymer formed by [(bis (2-hydroxyethyl) amino) methyl] diethyl phosphate and an epoxy compound. According to the synthesized waterborne polyurethane coating, the synergistic effect of nitrogen, phosphorus and silicon is utilized, flame propagation can be effectively inhibited, the molten drop phenomenon can be remarkably inhibited, and the limit oxygen index and the vertical combustion grade of the material are greatly improved.

The application discloses a method for preparing N-ethoxyl oxalyl alanine ester by using a dynamic tubular reactor, which comprises the following steps: (1) reacting L-alanine, diethyl oxalate and 4-dimethylaminopyridine in the dynamic tubular reactor; (2) removing light components from the reaction solution; (3) reacting the reaction solution after removing the light components and ethanol in the dynamic tubular reactor; and (4) obtaining N-ethoxyl oxalyl alanine ester after removing the light components. Compared with traditional kettle reactors and tubular reactors, the method adopts the dynamic tubular reactor to prepare N-ethoxyl oxalyl alanine ester, and through the regulation of reaction parameters, the selectivity of key by-products N-oxamide and double N-oxamide can be effectively controlled below 2%. The process has the advantages of high reaction yield, high degree of continuous operation, significantly shortened reaction time and no use of high-toxicity materials such as benzene.