1378 results about "Triethylamine" patented technology

The invention belongs to antibacterial materials, and particularly relates to antibacterial modified waterborne polyurethane and a preparation method and application thereof.The preparation method of the antibacterial modified waterborne polyurethane comprises the following steps that polyol and diisocyanate are mixed and subjected to a prepolymerization reaction, and a polyurethane prepolymer is obtained; mixing the polyurethane prepolymer and a chain extender, and carrying out chain extension reaction; in the chain extension reaction, adding the graft and carrying out esterification reaction to obtain a first intermediate; mixing the first intermediate with triethylamine and carrying out neutralization reaction to obtain a second intermediate; and emulsifying the second intermediate in deionized water to obtain the antibacterial modified waterborne polyurethane. Compared with the prior art, the antibacterial waterborne polyurethane has the advantages that the problems of poor intermiscibility, low durability and the like in physical addition and the problems of limited binding objects and weak antibacterial effect in covalent binding in the antibacterial waterborne polyurethane in the prior art are solved. According to the scheme, arginine and chitosan are grafted to a molecular chain of waterborne polyurethane, so that the waterborne polyurethane is endowed with a synergistic antibacterial property.

The present invention discloses a perfluoromethylcyclohexanone microcapsule fire extinguishing medium and its preparation process, which relates to the field of fire fighting technology. A perfluoromethylcyclohexanone microcapsule fire extinguishing medium is composed of a core material and a shell material. The core material includes perfluoromethylcyclohexanone, silicon dioxide, and azobisisobutyronitrile. The shell material includes modified guar gum, acrylic resin, aluminum hydroxide, potassium nitrate, and an emulsifier. The modified guar gum is prepared by the following method: tetrahydrofuran, guar gum, and triethylamine are sequentially added into a reactor, stirred and mixed evenly, and then a tetrahydrofuran solution of diphenylphosphinyl chloride is added dropwise. After the addition is completed, the temperature is raised to 75-85°C and the reaction is carried out for 10-14 hours, followed by post-treatment to obtain diphenylphosphinyl chloride-modified guar gum. The present invention modifies guar gum with diphenylphosphinyl chloride and then uses the modified guar gum for the shell material of perfluoromethylcyclohexanone microcapsules, improving the fire extinguishing performance, heat resistance, and long-term stability of perfluoromethylcyclohexanone microcapsules.

The present invention relates to a preparation method of a flame-retardant, high-refractive-index, melt-drop resistant waterborne polyurethane coating. A diol, an isocyanate and dibutyltin dilaurate are added to a 500 mL flask, and the temperature is raised to 70-85 °C, and the mixture is stirred and reacted for 1-2 h to obtain a polyurethane prepolymer; then a charring agent is added to the polyurethane prepolymer, and the reaction is continued for 1-2 h; the temperature is lowered to 60 °C, and then 2,2-dimethylolbutyric acid and amino carbon nanotubes are added and reacted for 0.5-1 h; then a high-refractive-index material is added, and the reaction is carried out at 65-70 °C for 1-2 h, the temperature is lowered to 40 °C, and then triethylamine is added and reacted for 0.5-1 h; deionized water is added, and at a rotation speed of 2000 r / min, an ammonium polyphosphate solution is added, and high-speed shear emulsification is carried out for 0.5-1 h to obtain a flame-retardant, high-refractive-index, melt-drop resistant waterborne polyurethane coating. This polyurethane coating has high flame retardancy, high refractive index and no melt-dropping property.

The invention relates to the technical field of polyimide films, in particular to a PI film and a preparation method thereof. The PI film comprises the following raw materials in parts by mass: 100-150 parts of soluble polyimide resin, 5-15 parts of biphenyl epoxy resin, 5-10 parts of activated titanium dioxide, 1-5 parts of a curing agent and 1-3 parts of a curing accelerator, the soluble polyimide resin comprises the following raw materials in parts by mass: 5-10 parts of a first monomer, 25-30 parts of a second monomer, 50-60 parts of a third monomer, 20-30 parts of acetic anhydride and 5-15 parts of triethylamine. The size stability and heat resistance of the film can be remarkably improved, meanwhile, the outstanding transparency of the polyimide film can be guaranteed, and the application of the film in the field of flexible display is met.

The invention relates to the technical field of electric power facilities, in particular to a high-strength flame-retardant fireproof cable and a preparation method thereof. The phosphonitrile flame retardant is prepared by adding phosphonitrilic chloride trimer, phenylphosphonic acid, triethylamine and melamine. Then, 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, the modified carbon nanotubes and the flame-retardant modified halloysite nanotubes are used as main raw materials, and the flame-retardant filler is prepared. The preparation method comprises the following steps: mixing polyolefin, a phosphazene flame retardant, a flame-retardant filler, talcum powder, gum and stearic acid, fully stirring and melting to obtain a sizing material, and carrying out crosslinking, granulation and molding on the sizing material to obtain the cable protection sleeve. And wrapping the outermost layer of the cable with the cable protection sleeve to obtain a finished cable. The finished cable prepared by the invention has good flame retardance and mechanical strength, so that the cable has a wide application prospect in the technical field of electric power facilities.

The invention provides a preparation method of a two-dimensional high-strength coating material, which comprises the following steps: under the protection of inert gas, dissolving melamine and trimesoyl chloride as reaction monomers in a solution A, adding triethylamine as an acid-binding agent, and promoting amidation reaction through magnetic stirring; after the reaction is finished, washing with saturated saline solution and NaHCO3 to remove impurities, and then obtaining high-purity two-dimensional polymer powder through the steps of solution mixing, ultrasonic treatment, centrifugal separation and the like. And finally, dissolving polymer powder in the solution F to prepare two-dimensional polymer solutions with different concentrations, and coating the two-dimensional polymer solutions on the surface of a substrate pretreated by acetone and isopropanol to obtain a flat and compact coating film. The triethylamine is adopted as the acid binding agent, so that the purity and the reaction efficiency of the polymer are improved, the preparation controllability and the structural uniformity of the coating material are remarkably improved, and the high-performance coating requirements in the fields of machinery, chemical protection and the like are met.

The invention relates to the technical field of fabric waterproofing agents, in particular to a polyurethane modified organic silicon fluoride-free waterproofing agent and a preparation method thereof. The polyurethane modified organic silicon fluoride-free waterproof agent is prepared from the following raw materials in parts by mass: 5 to 15 parts of hexamethylene diisocyanate, 5 to 15 parts of butyl acrylate, 1 to 5 parts of methyl methacrylate, 40 to 60 parts of octamethylcyclotetrasiloxane, 10 to 30 parts of alpha, omega-dihydroxy polydimethylsiloxane and 5 to 10 parts of gamma-aminopropyl methyl diethoxy silane. The invention relates to a silane coupling agent, which is prepared from the following raw materials in parts by weight: 1 to 5 parts of glycidyl ether oxypropyl trimethoxy silane, 0.1 to 1 part of tetramethylammonium hydroxide, 0.1 to 1 part of triethylamine, 2 to 5 parts of tetraethoxysilane, 0.2 to 0.75 part of ammonia, 0.1 to 1 part of silane coupling agent KH-570, 0.01 to 0.1 part of dibutyltin dilaurate, 1 to 5 parts of epsilon-caprolactam, 1 to 2 parts of emulsifier and 0.1 to 1 part of initiator. The fabric treated by the method has good softness and excellent hydrophobic effect.

The invention discloses a carbon-based catalyst and a preparation method and application thereof to isomerization of glucose into fructose, the catalyst comprises an active component loaded on a carbon-based catalyst carrier and a chelating agent complexed with the active component, metal salts in the active component are Mg and K, the chelating agent is one or more of citric acid, triacetic acid, triethylamine ethylenediamine and potassium sodium tartrate. The chelating agent adjusts alkali active sites of a reaction system through acidic functional groups of the chelating agent, maintains an acid-base environment required by the reaction, and promotes an isomerization reaction from glucose to fructose. Meanwhile, the chelating agent and the metal ions form a stable complex to prevent metal salt from inactivation, and the metal ions are ensured to be uniformly distributed on the surface of the carrier and prevented from being agglomerated through the dispersity of the chelating agent, so that the activity and stability of the catalyst are improved. By controlling the dosage of the chelating agent and coordination of metal ions, the selectivity of the glucose isomerization reaction and the fructose yield are effectively improved, side reactions are inhibited, and the overall efficiency of the reaction is remarkably improved.

The invention relates to the technical field of ABS (Acrylonitrile Butadiene Styrene) materials, in particular to an impact-resistant composite ABS plate and a preparation method thereof. The impact-resistant composite ABS plate is prepared from the following raw materials in parts by mass: 100 to 200 parts of emulsion ABS resin, 10 to 20 parts of butadiene monomer, 5 to 10 parts of methyl methacrylate, 1 to 5 parts of glycidyl acrylate, 1 to 5 parts of maleic anhydride, 5 to 15 parts of styrene, 1 to 5 parts of aminated silicon dioxide, 0.1 to 0.5 part of benzoyl peroxide, 0.1 to 0.3 part of triethylamine, 0.1 to 1 part of emulsifier and 0.01 to 0.1 part of first initiator, 0.05-0.2 part of a second initiator, 1-3 parts of oxidized polyethlene wax, 1-2 parts of a lubricant and 1-3 parts of an antioxidant. The invention solves the contradiction between the heat resistance and impact strength of the ABS resin, has obvious advantages compared with the traditional modification system, and completely meets the application requirements of the plate in a high-temperature vibration environment.

The invention belongs to the technical field of ceramic materials, and particularly relates to a high-strength building ceramic material and a preparation method thereof. The high-strength building ceramic material is prepared from the following raw materials in parts by weight: 20 to 30 parts of potassium feldspar, 15 to 23 parts of kaolin, 37 to 45 parts of solid waste-based silicon carbide, 1 to 4 parts of talc, 3 to 8 parts of modified mullite whisker and 2 to 5 parts of filler, a preparation process of the modified mullite crystal whiskers comprises the following steps: (1) adding mullite crystal whiskers into an ethanol water solution containing a silane coupling agent, and heating for reaction to obtain pretreated mullite crystal whiskers; and (2) adding the mullite whiskers pretreated in the step (1) into a nickel sulfate aqueous solution, then adding triethylamine and sodium thiosulfate, and carrying out a heating reaction to obtain the modified mullite whiskers. After the raw material components are combined, preparation of a high-strength ceramic material is facilitated, the heat conductivity coefficient can be increased, the heat conduction effect can be enhanced, and the ceramic material is suitable for common home decoration and high-heat-conductivity floor heating ceramic tiles.

The invention belongs to the technical field of polycarbonate materials, and particularly discloses a high-strength flame-retardant polycarbonate plastic and a preparation method thereof. The high-strength flame-retardant polycarbonate plastic comprises the following components in parts by weight: 60-80 parts of polycarbonate, 5-10 parts of a flame retardant, 0.1-2 parts of a dispersing agent, 0.1-2 parts of an antioxidant, 3-8 parts of a reinforcing agent and 2-6 parts of a toughening agent, a preparation process of the flame retardant comprises the following steps: adding 1, 10-phenanthroline-4, 7-diamine and triethylamine into dichloromethane, cooling to-5 to 5 DEG C, adding a dichloromethane solution of a compound A in an inert gas atmosphere, stirring to react, and purifying a reaction solution to obtain the flame retardant. The polycarbonate plastic prepared by the invention has excellent mechanical property and flame retardant property.

The invention relates to the field of phosphorus-nitrogen flame retardants, and discloses a preparation method and application of a novel phosphorus-containing nitrogen oxide flame retardant, the preparation method comprises the following steps: S1, under the protection of nitrogen, dissolving diphenylphosphinyl hydroxylamine and triethylamine in a tetrahydrofuran solvent to prepare a reaction substrate solution; s2, slowly dropwise adding a diphenylphosphinyl chloride solution into the solution, and then sufficiently carrying out the reaction in a staged heating and heating reflux mode; s3, cooling and filtering to remove solid byproducts generated by reaction, and concentrating filtrate to obtain a crude product solid; and S4, recrystallizing and purifying the crude product by using ethyl acetate, and finally heating and drying the obtained crystal under a vacuum condition to obtain the product. An N-O group is innovatively introduced into the molecular structure of the flame retardant, so that the effect of efficiently capturing gas-phase free radicals in cooperation with a phosphorus-containing group is achieved, and the substantive technical progress that the material can be endowed with excellent flame retardant property with extremely low addition amount is realized.

The invention relates to a nitrogen-containing heterocyclic compound as well as a preparation method and application thereof, belongs to the technical field of heterocyclic compound synthesis, and solves the problems of low reaction efficiency and high energy consumption caused by the fact that an existing method for synthesizing an indole maleimide derivative needs to be carried out step by step. The preparation method comprises the following steps: step 1, adding indoleacetamide and a nucleophilic reagent into a mixed solution, and reacting; 2, performing post-treatment to obtain a nitrogen-containing heterocyclic compound; the mixed solution comprises alkali, an additive and an organic solvent; the alkali comprises one of triethylamine (Et3N), N, N-diisopropylethylamine, pyridine and 1, 8-diazabicyclo [5.4. 0] undec-7-ene, and the alkali comprises one of 1, 8-diazabicyclo [5.4. 0] undec-7-ene.

The invention discloses a wood-based composite phase-change material and a preparation method thereof, and belongs to the technical field of phase-change materials.The preparation method of the wood-based composite phase-change material comprises the following steps that wood is cut and then added into delignification liquid to be heated, the wood is taken out and washed with water, and delignified wood is obtained; the delignification wood is added into the modification liquid to be heated, and after being taken out, the delignification wood is washed and dried to obtain pretreated wood; mixing polyethylene glycol, citric acid and boric acid, heating and stirring to obtain a phase change material; dipping the pretreated wood into the phase change material for vacuum dipping, taking out and drying to obtain the phase change material. The modified liquid is prepared from an ethanol water solution, a modified filler, 2-(3, 4-cyclohexene oxide) ethyltrimethoxysilane and triethylamine. The delignification liquid and the modification liquid are adopted for pretreating the wood, so that the wood can be better firmly combined with the phase change material, leakage is prevented, and the finally prepared wood-based composite phase change material has excellent heat management capacity and stability.

The invention discloses an indoor flame-retardant insulated flexible wire and a preparation method thereof, belongs to the technical field of flexible wires, and is used for solving the technical problem that the insulating property and flame-retardant property of an indoor flexible wire in the prior art need to be further improved. The cable comprises a wire layer formed by twisting a plurality of copper wires, an insulating layer and an outer sheath layer, a modified aminating agent taking a siloxane chain segment as a main body is prepared, polyvinyl chloride is aminated and hybridized with a space chain segment of the polyvinyl chloride at the same time, after phosphorus-hydrogen addition and surface modification, the hybridized polyvinyl chloride is obtained, and through sodium hypophosphite and 1, 2, 4-trimethyl-1, 3-pentanediol, the flame retardant is added to the polyvinyl chloride, so that the cable is formed. The preparation method comprises the following steps: carrying out phosphorus-hydrogen addition on 2, 3-dihydroxystyrene to obtain a modified cross-linking agent, forming a spherical structure by the modified cross-linking agent and phosphonitrilic chloride trimer under triethylamine and ultrasonic conditions, carrying out surface modification to obtain flame-retardant microspheres, and carrying out melt extrusion on the modified cross-linking agent and phosphonitrilic chloride trimer as main materials and auxiliary materials of an outer sheath layer to finally prepare the flame-retardant insulated flexible wire.

The invention discloses a fluopyram preparation method, which comprises: S1, carrying out a heating reaction on 2-vinyl-3-chloro-5-trifluoromethylpyridine, ammonia water, a catalyst and a solvent, carrying out reduced pressure distillation after the heating reaction to recover the solvent so as to obtain a residue, and adding dichloromethane and triethylamine to the residue so as to obtain a reaction liquid; and S2, dropwise adding o-trifluoromethyl benzoyl chloride into the reaction liquid in an ice bath, then removing the ice bath, stirring at the room temperature, adding water into the reaction liquid obtained in the step S1, extracting an organic layer, drying with anhydrous magnesium sulfate, recovering the solvent under reduced pressure, and performing vacuum drying to obtain the fluopyram. The method has the advantages of high reaction yield, high product purity, recyclable and reusable solvent, simple and mild production process, and suitableness for mass production.

The invention belongs to the technical field of flame retardants, and particularly relates to a preparation method of bromotriazine, which comprises the following steps: adding phenol and deionized water into a reaction container, dropwise adding hydrogen peroxide and liquid bromine into a reaction system in a staggered manner, and adding a catalyst; after the reaction is finished, separating the catalyst, firstly carrying out quenching treatment on the filtrate, then carrying out extraction treatment, and carrying out reduced pressure distillation on the extracted organic phase to obtain tribromophenol; dissolving the prepared tribromophenol in dichloromethane, adding triethylamine and tetrabutylammonium bromide, stirring to form a homogeneous system, adding cyanuric chloride into the homogeneous system, and regulating and controlling the pH in stages; concentrating the organic phase which is washed to be neutral, adding n-hexane to initiate primary nucleation, dropwise adding ethyl acetate to adjust the polarity of the solvent, and promoting crystal growth; and filtering and drying in vacuum to obtain the bromo-triazine. Through staged pH / temperature regulation and control, the composite catalyst system realizes efficient synthesis of bromotriazine.

The invention discloses a high-temperature-resistant nylon composite material and a production process thereof, and belongs to the technical field of nylon composite material preparation. The high-temperature-resistant nylon composite material is prepared from the following components in parts by weight: 35-48 parts of nylon resin, 7-12 parts of a heat-resistant agent, 3-8 parts of a modified anticorrosive agent, 1-3 parts of calcium stearate, 1-3 parts of a flame retardant and 2-10 parts of glass fibers, and the heat-resistant agent is prepared from 2, 4-dinitrophenol, hydrazine hydrate, p-nitrobenzoic acid, triethylamine, polyphosphoric acid and 2, 4-dinitrophenol. The nylon composite material is prepared from 2, 2 '-bis (3, 4-dicarboxylic acid) hexafluoropropane dianhydride, and the modified anticorrosive agent is prepared from fluororubber, benzyltriethylammonium chloride, lithium aluminum hydride and isophorone diisocyanate. The nylon composite material prepared by the method has excellent high temperature resistance and corrosion resistance.

The invention discloses a DA bond polymer with antibacterial and self-repairing functions for a wood surface as well as a preparation method and a use method of the DA bond polymer. Chitosan serves as a wall material, cinnamon essential oil serves as a core material, the cinnamon essential oil and chitosan antibacterial microcapsules are prepared through emulsification, crosslinking and spray drying, and essential oil controlled release is achieved. Then bisphenol A diglycidyl ether DGEBA and furfuryl alcohol FA are used as raw materials, furyl functional epoxy resin FER is prepared under the catalysis of triethylamine TEA, bismaleimide BMI is added, and a DA bond self-repairing polymer is prepared through a DA reaction; and adding 4, 4-diaminodiphenylmethane DDM into the system, reacting with redundant DGEBA to generate a cross-linked polymer network, and adding the microcapsules into a DA bond semi-interpenetrating self-repairing network solution to obtain the DA bond polymer. A thin film formed by brushing and curing wood has antibacterial and self-repairing functions, scratches and microcracks on the surface of the wood can be repaired, and microbial erosion is inhibited.

The invention discloses a method for improving the crystallinity of a flexible covalent organic framework film through solvent heat treatment, and relates to the technical field of flexible functional film materials, and the method comprises the following steps: (1) synthesizing a COF film; (2) soaking the COF membrane in a triethylamine methanol solution to remove residual acidic components; and (3) putting the treated membrane into an acetic acid acetonitrile solution, and heating at 100 DEG C for 0.5-6 hours to improve the crystallinity of the membrane. According to the method, rearrangement of framework chain segments in a film body and enhancement of crystallinity are achieved through the mild two-step solution treatment step, the XRD diffraction intensity, the film body compactness and the structural orderliness of the COF film are remarkably improved, and meanwhile the flexibility and the mechanical property of an original film are kept.

The invention belongs to the technical field of high polymer material preparation, and particularly relates to a solar interface evaporator with a cross-linked double-layer structure and application. The preparation method comprises the following steps: carrying out primary reaction on 4, 4 '-diphenyl ether dianhydride and biphenyl carboxylic acid, or hexafluorodianhydride, 9, 9-bis (trifluoromethyl)-2, 3, 6, 7-xanthene tetracarboxylic dianhydride and m-bitoluidine in a solvent, blocking by using maleic anhydride to form a polyamide acid solution, adding triethylamine to carry out catalytic reaction, washing, precipitating, filtering and drying to obtain a precursor A and a precursor B; then respectively preparing the precursor A and the precursor B into aqueous solutions, and then adding a photo-thermal material graphene into the aqueous solution B; then, the precursor A solution is poured into a mold to be frozen, then the solution B mixed with the graphene is poured into the mold, freezing and thermal imidization are conducted again, the cross-linked solar interface evaporator of the double-layer structure is obtained, and the evaporator has wide application prospects in the aspects of seawater desalination and sewage treatment.

The invention relates to the technical field of advanced ceramic materials, in particular to high-entropy ceramic powder and a preparation method and application thereof.The preparation method comprises the following steps that a metal source is dissolved in n-propyl alcohol and mixed to be uniform, and an n-propyl alcohol solution of the metal source is obtained; adding triethylamine into the normal propyl alcohol solution of the metal source to obtain a first mixed solution of the metal source; adding water into the first mixed solution of the metal source to obtain a second mixed solution of the metal source; freeze-drying the second mixed solution of the metal source to obtain a first solid; adding an aqueous solution of glucose into the first solid, carrying out high-temperature reaction, and freeze-drying to obtain a second solid; cracking the second solid in an inert atmosphere to obtain high-entropy ceramic powder; wherein the molecular formula of the high-entropy ceramic powder is MC, and M is a combination of four elements of Nb, Zr, Ta and Ti in an equal molar ratio. The high-entropy ceramic powder disclosed by the invention has the advantages of small agglomeration, low oxygen content, uniform particle size distribution, good particle dispersion and excellent electrochemical performance.

The invention relates to the technical field of gas separation, in particular to an amine recovery monitoring method and system for polyurethane synthesis tail gas. The method comprises the following steps: preliminarily separating to obtain a triethylamine solution; collecting parameter values of different parameters for distillation of the triethylamine solution; acquiring a parameter sequence in a preset time period; decomposing the parameter sequence to obtain a periodic sequence and a trend sequence; obtaining periodic saliency values of different parameters based on the periodic sequence, and obtaining a fluctuation consistency coefficient based on the trend sequence; a distillation interference coefficient is obtained after weighting; pure triethylamine is obtained based on the distillation interference coefficient control system; collecting attribute values of different attributes, constructing a change characteristic value sequence through differences between data values and predicted values of the attributes in the sliding window, and obtaining a dehydration steady-state index based on sequence similarity and vapor pressure differences; and recycling and monitoring of triethylamine are realized based on the dehydration steady-state index. According to the method, the dehydration efficiency of the triethylamine is improved, and the purity of the recovered triethylamine is further improved.

The invention provides a lithium battery diaphragm and a preparation method thereof, and the preparation method comprises the following steps: carrying out a reaction on melamine and terephthalaldehyde in dimethyl sulfoxide to obtain SNW-1COF; the preparation method comprises the following steps: enabling SNW-1COF to react with allyl-1, 3-sultone in acetonitrile, so as to obtain allyl SCOF; the polyarylether benzimidazole, the 2-sulfydryl-5-fluorobenzimidazole, triethylamine and allyl SCOF are subjected to a reaction in a third solvent, and a membrane casting solution is obtained; and applying the membrane casting solution to a base material, and removing the solvent in the membrane casting solution to obtain the lithium battery diaphragm. According to the invention, the OPBI matrix and the propenyl SCOF react to form a covalent cross-linked network, so that the mechanical properties of the diaphragm in the aspects of thermal shrinkage rate, tensile strength, puncture strength and the like and the electrical properties in the aspects of wettability and ionic conductivity are improved.

The invention relates to the technical field of organic synthesis, and particularly discloses a synthesis process of 2-chloronicotinic acid. The synthesis process of the 2-chloronicotinic acid comprises the following steps: S1, mixing water, concentrated sulfuric acid, 3-cyanopyridine and a composite catalyst, performing pre-reaction, adding hydrogen peroxide, performing oxidation reaction, adjusting pH, performing solid-liquid separation, and washing to obtain an oxide intermediate; s2, in an inert atmosphere, adding phosphorus oxychloride into a reactor, adding the oxide intermediate and triethylamine for a chlorination reaction, recovering phosphorus oxychloride after the reaction is finished, hydrolyzing remaining materials, and performing solid-liquid separation and washing to obtain chloride; and S3, carrying out alkali dissolution, neutralization, decoloration and acidification on the chloride, carrying out solid-liquid separation, washing, carrying out secondary alkali dissolution, neutralization and secondary decoloration, adding a complexing agent, carrying out secondary acidification, carrying out solid-liquid separation, washing, drying and crushing to obtain the 2-chloronicotinic acid. The 2-chloronicotinic acid prepared by the method disclosed by the invention has relatively high purity and yield.

The invention belongs to the field of separation membranes, and particularly relates to an anti-pollution and washable reverse osmosis membrane and a preparation method thereof. The reverse osmosis membrane provided by the invention is prepared according to the following steps: soaking a nascent state polyamide reverse osmosis membrane in a first treatment solution, taking out and cleaning, then soaking in a second treatment solution, taking out and draining to obtain the anti-pollution and washing-resistant reverse osmosis membrane, the nascent state polyamide reverse osmosis membrane comprises a non-woven fabric layer, a porous support layer and a polyamide separation layer which are in contact in sequence; the first treating fluid contains double-end amino polyethylene glycol and triethylamine; the second treatment liquid contains polyvinyl alcohol and alpha-aldehyde group-omega-carboxyl polyethylene glycol. Experimental results show that the reverse osmosis membrane provided by the invention has relatively high anti-pollution capacity, desalting rate and acid and alkali cleaning resistance.

The invention belongs to the technical field of textile materials, and discloses an easy-to-dye composite polyester fiber and a preparation method thereof. The preparation method comprises the following steps: by taking polyethylene glycol terephthalate as a core layer and low-melting-point polyester as a skin layer, carrying out melt spinning to prepare skin-core composite fibers; after heating and melting a skin layer, bombarding by using a titanium dioxide nano particle flow to obtain roughened fibers; after plasma treatment, dipping with an activating solution of triethylamine and 4-methylbenzenesulfonyl chloride to obtain activated fibers; carrying out ultrasonic reaction on the activated fiber and a modifier under the catalysis of tetrabutyl titanate, and washing and drying to obtain the easy-to-dye composite polyester fiber. The prepared composite polyester fiber not only has the advantage of being easy to dye, but also has excellent antibacterial performance and flame retardant performance, and the quality of the composite polyester fiber is effectively guaranteed.

The invention belongs to the field of flame retardance of high polymer materials, and relates to a preparation method of a metal organic framework polyphosphazene flame retardant and application of the flame retardant in PET flame retardant modification.The preparation method comprises the steps that a metal salt solution and a phytic acid solution are mixed according to the molar ratio of (3-15): 1, the pH is adjusted to 7-8, alcohol is added for a reaction, and phytic acid-based MOFs are obtained; mixing the phytic acid-based MOFs with a 4, 4 '-disubstituted diphenyl compound, triethylamine and alcohol to obtain a second mixed solution; hexachlorocyclotriphosphazene (HCCP) is mixed with the second mixed solution, the molar ratio of the 4, 4 '-disubstituted diphenyl compound to the HCCP is (2-4): 1, the mixture reacts at the temperature of 20-90 DEG C, and the phytic acid group MOFs (at) HCCP is obtained. HCCP is hybridized on the surface of phytic acid-based MOFs, and the flame retardant has excellent flame retardance and environmental protection performance by utilizing the char-forming catalytic capability of the phytic acid-based MOFs and the phosphorus-nitrogen flame retardance characteristic of HCCP.

The invention provides a preparation method for a reverse osmosis membrane resistant to a high-temperature water environment, comprising: synthesizing an α-cyclodextrin@polyethylene glycol supramolecular inclusion complex by a saturated aqueous solution coprecipitation method; preparing an aqueous phase solution containing m-phenylenediamine, D(+) camphorsulfonic acid and triethylamine; preparing an oil phase solution containing trimesoyl chloride; preparing a secondary aqueous solution containing α-cyclodextrin@polyethylene glycol powder and triethylamine; forming an ultrathin polyamide separation layer on a base membrane by interfacial polymerization; and performing secondary interfacial polymerization to form an α-CD@PEG polyester protection layer, and storing a prepared reverse osmosis membrane in ultrapure water.

The invention discloses a method for synthesizing 2-vinylpyridine by a one-pot method, which comprises the following step: by taking 2-methylpyridine and paraformaldehyde as raw materials and water as a solvent, synthesizing the 2-vinylpyridine by a one-pot reaction under the catalysis of a basic catalyst. According to the invention, 2-methylpyridine and paraformaldehyde are taken as initial raw materials, the raw materials are simple and easy to obtain, the production cost is reduced, and water is taken as a solvent, so that the use of a large amount of organic solvents is avoided, and the influence on environmental pollution is small. In the reaction, a basic catalyst such as triethylamine is used as a catalyst, a small amount of sodium hydroxide solid is added in the reaction process, the basic catalyst enables the whole system to be in an alkaline environment, and sodium hydroxide improves the depolymerization efficiency of paraformaldehyde and promotes the dehydration process of the reaction, so that the selectivity and yield of 2-vinylpyridine are improved.