66 results about "N-Butylamine" patented technology

The invention belongs to the technical field of fine chemical engineering, and particularly discloses a method for preparing a broad-spectrum bactericide 2-n-butylbenzo [d] isothiazole-3 (2H)-ketone by a molecular editing method. The preparation method comprises the following specific steps: taking 3H-1, 2-benzodisulfophenol-3-ketone and n-butylamine as raw materials, taking Selectfluor as an additive, adding the raw materials and the additive into a mixed solvent, and carrying out heating and stirring reaction, so as to obtain the target product 2-n-butylbenzo [d] isothiazole-3 (2H)-ketone (BBIT). The method is simple and convenient to operate, the raw materials are easy to obtain, the yield is high, thiophenol raw materials or excessive alkali are prevented from being used, and potential application value is achieved.

This invention belongs to the field of polymer materials technology and relates to a method for preparing a rigid hydrogel based on multi-branched epoxy oligomer crosslinked polyurethane. The method includes: weighing a polyurethane prepolymer, stirring and heating to 60-90°C, slowly adding a multi-branched epoxy oligomer dispersion, and reacting for 1-5 hours; determining the theoretical content of isocyanate groups using the di-n-butylamine method, and adjusting the system temperature to 35-55°C after reaching the theoretical value, and slowly adding a salting agent; cooling to room temperature, and removing the solvent by vacuum distillation using residual heat during the cooling stage; adding deionized water, and stirring until a white emulsion is obtained. This invention also applies the prepared rigid hydrogel to moisture-locking and fragrance-preserving packaging materials. The rigid hydrogel prepared by this invention exhibits stronger rigidity due to the introduction of a branched framework in its structure. When combined with aluminized paper, it forms a composite paper with moisturizing properties and excellent water absorption, making it widely applicable in the field of moisture-locking and fragrance preservation technology.

The invention relates to an intermediate of a chemical synthetic drug and a preparation method of the intermediate, in particular to an intermediate compound for preparing dronedarone and a preparation method of the intermediate compound. The intermediate is a new compound 2-n-valeryl-5-methanesulfonamide benzofuranone, and the compound can be applied to synthesis of a dronedarone drug through butt joint with 1-phenoxy-3-di-n-butylamine propane. The new intermediate is used for synthesizing dronedarone, raw materials and auxiliary materials are rich in source, low in price and easy to obtain, the process steps are short, the cost is low, the reaction conditions are mild and environmentally friendly, the target product preparation efficiency is high, no reaction device with special requirements exists, and the industrial production requirement can be met.

The invention relates to the technical field of lithium ion battery material recovery, in particular to a green stripping recovery method of a waste lithium iron phosphate battery positive electrode material. The method comprises the following steps: discharging and disassembling the waste lithium iron phosphate battery to obtain a positive pole piece; a hydrogen bond acceptor, a hydrogen bond donor and water are mixed, heated and stirred, the eutectic solvent is obtained, the hydrogen bond acceptor is inorganic salt capable of generating sulfate radical, nitrate radical, phosphate radical, carbonate radical or ammonium radical, and the hydrogen bond donor is one or more of urea, thiourea, tetraethylenepentamine, n-butylamine, N-ethylethylenediamine, 1-propanethiol and diallyl sulfide; and soaking and stripping the positive pole piece in the eutectic solvent to obtain the stripped and recycled positive pole material. According to the method, stripping and recycling of the positive electrode material are achieved, and the stripped and recycled positive electrode material is complete in structure, high in purity and good in electrochemical performance.

The invention belongs to the field of cultural relic protection, and relates to a cultural relic surface accessible acidity determination method, which comprises: 1) placing a cultural relic sample using palm leaves as a carrier in a chemical adsorption device, and pre-treating in an inert gas atmosphere; (2) after pretreatment is completed, mixed gas formed by n-butylamine and inert gas is introduced into a chemical adsorption device, and specific chemical adsorption is carried out through the n-butylamine and accessible acid sites on the surface of the cultural relic sample; (3) after adsorption is completed, heating the inner cavity of the chemical adsorption device at a constant rate, desorbing n-butylamine, and recording a desorption signal at the same time; and 4) calculating the acid site concentration according to the desorption signal peak area obtained in the step 3), and determining the acid intensity according to the peak position distribution.The invention provides the cultural relic surface accessible acidity determination method with good specificity and high sensitivity.

The invention discloses an Ag-Bi2WO6 heterojunction photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. The preparation method comprises the following steps: adding Na2WO4. 2H2O, Bi (NO3) 3.5 H2O and CTAB (Cetyltrimethyl Ammonium Bromide) into deionized water, violently stirring, uniformly dispersing, putting into a high-pressure kettle, and carrying out hydrothermal reaction to obtain Bi2WO6; the preparation method comprises the following steps: slowly pouring an ethanol solution of AgNO3 into an ethanol solution of Bi2WO6, heating and stirring, slowly dropwise adding n-butylamine, continuously heating and stirring, cooling, washing, and carrying out vacuum drying to obtain Ag-Bi2WO6. Compared with an existing photocatalyst, the Ag-Bi2WO6 heterojunction has good stability and responsivity to CO2, a strong built-in electric field at the heterojunction interface can accelerate separation and transfer of carriers and enhance adsorption and activation of CO2, and therefore the activity of photocatalytic reduction of CO2 is improved.

The application is a kind of continuous preparation method and application of core-shell type reduced Cu-based catalyst. The method uses membrane dispersion micro-reactor technology, adopts liquid phase chemical reduction method with potassium borohydride-hydrazine hydrate as double reducing agent, continuously prepares reduced Cu-based nanoscale catalyst, does not need high temperature calcination and hydrogen reduction, can be directly used as active catalyst for catalytic reaction, and realizes green and efficient preparation. The catalyst prepared by the application is used in the reaction of preparing N-butyl-2,2,6,6-tetramethyl-4-piperidinamine from 2,2,6,6-tetramethyl-4-piperidinone and n-butylamine through reductive amination, and excellent catalytic activity and stability are shown.

A zeolite having a ferrierite framework structure produced using one or more of n-propylamine, n-butylamine, isobutylamine, and n-pentylamine as a structure directing agent.

The utility model provides a production device for synthesizing TBTD in one step, which comprises a reaction kettle, a di-n-butylamine adding pipeline, a hydrogen peroxide adding pipeline, a carbon disulfide adding pipeline, a soft water adding pipeline, a carbon disulfide gas discharging pipeline and a nitrogen pipeline are arranged at the top end of the reaction kettle, and the carbon disulfide gas discharging pipeline is connected with a gas inlet of a condenser. A condensate outlet pipeline of the condenser is connected with a carbon disulfide receiving tank, a bottom outlet pipeline of the carbon disulfide receiving tank is connected with a carbon disulfide adding pipeline, and the carbon disulfide adding pipeline is further connected with a carbon disulfide transfer pump; hydrogen peroxide is adopted as an oxidizing agent, so that high-salinity wastewater discharge is reduced; the reaction liquid is washed with water for many times to remove residual alkali liquor and byproducts, water is used as a solvent to replace a traditional methanol / ethanol system, and emission of VOCs is reduced; the metering pump is used for dropwise adding materials, so that automatic sealing feeding is realized, and harm to bodies of workers is reduced; carbon disulfide is recycled for next reaction, so that the material loss is reduced, and the pollution problem in the subsequent treatment process is reduced.

The present invention relates to the technical field of biodegradable materials, and specifically discloses a biodegradable material for adding BBM bamboo powder and its application in beer bottles. The raw materials of the above-mentioned biodegradable material for adding BBM bamboo powder include by mass: 10-20 parts of polybutylene succinate, 10-30 parts of polybutylene adipate terephthalate, 10-20 parts of bamboo powder, 1-3 parts of dopamine hydrochloride, 0.1-0.5 parts of n-butylamine, 1-2 parts of hexadecyltrimethylammonium bromide, 1-5 parts of tetraethyl orthosilicate, 1-2 parts of tetrabutyl titanate, 1-2 parts of 3-aminopropyltriethoxysilane, 1-2 parts of antioxidant, and 1-2 parts of plasticizer. The BBM obtained by the present invention has excellent mechanical properties, while improving the anti-ultraviolet strength of degradable materials to a certain extent, and has good biodegradability.

The present application relates to the technical field of molecular sieve preparation, and provides a surface silicon-rich binderless ZSM-5 molecular sieve catalyst and a preparation method and application thereof.The overall SiO2 / Al2O3 of the ZSM-5 molecular sieve catalyst is 86-203, the SiO2 / Al2O3 of a surface layer with a depth of 2-10 nm is 8-33% higher than the overall SiO2 / Al2O3; the acid strength measured by using Hammett indicator n-butylamine titration method is H0≤+2.27, and the content of surface acid sites is ≤0.02 mmol / g; and the ZSM-5 molecular sieve catalyst is a shaped body without amorphous phase.The surface silicon-rich binderless ZSM-5 molecular sieve catalyst provided by the present application does not contain inert adhesive, has extremely weak surface acidity, can improve the catalytic effect, and reduces the generation of by-products.In addition, the preparation method provided by the present application is simple in process and suitable for industrial production.

The invention discloses a solid defoamer suitable for ceramic glazing and a preparation method thereof. The solid defoamer comprises the following formula: 10-30 parts of rhamnose, 0.0001-0.05 parts of a DMC bimetallic catalyst, 5-20 parts of polyoxyethylene, 5-40 parts of polyoxypropylene, 0.1-2.5 parts of a hydrogen capping agent, 5-20 parts of polydimethylsiloxane, 5-20 parts of carborane, 1-5 parts of n-butyllithium, 0.0001-0.009 parts of cis-dichlorodiammineplatinum, 3-8 parts of methyldichlorosilane, 0.0001-0.01 parts of ferric chloride, 0.8-4 parts of ammonium chloride, 10-30 parts of bovine bone ash, 6-20 parts of fumed silica, 0.001-3.5 parts of light calcium carbonate, 0.8-3.0 parts of phenoxyethanol, 0.001-0.2 parts of iodopropynyl n-butylcarbamate, and 20-40 parts of water. The present invention utilizes carborane to enhance ceramic properties while avoiding the problem of residue disposal. The dispersion of silicon dioxide and light calcium carbonate ensures uniform dispersion and stable ceramic components. The use of cattle bone ash as a dispersant ensures uniform dispersion and a moist ceramic surface.

The invention relates to continuous reaction equipment of N-n-butyl thiophosphoric triamide and a preparation method of the N-n-butyl thiophosphoric triamide. The invention discloses a continuous preparation method of N-n-butyl thiophosphoric triamide and reaction equipment, and belongs to the technical field of fine chemical engineering. The method comprises the following steps: uniformly mixing thiophosphoryl chloride serving as an initial raw material with a solvent in a batching kettle to prepare a thiophosphoryl chloride solution; the method comprises the following steps: respectively adding a thiophosphoryl chloride solution, n-butylamine and inert gas into a micro-channel reactor through a flow pump to carry out substitution reaction, and separating hydrogen chloride gas and an N-n-butyl dichlorothiophosphoramide solution through a gas-liquid separator; then adding the N-n-butyl dichlorophosphoramide thiophosphate solution and liquid ammonia into a tubular reactor through a flow pump to obtain an N-n-butyl thiophosphoric triamide solution; and finally, extracting, washing, concentrating an organic phase, crystallizing, separating and drying to obtain the high-purity N-n-butyl thiophosphoric triamide. The method is safe, efficient, simple and convenient to operate, good in reaction selectivity, high in yield, low in pollutant emission, low in production cost and suitable for industrial production.

The invention provides a preparation method of an N-alkoxy hindered amine light stabilizer Tinuvin 152, which comprises the following steps of: performing one-step oxidation process on 2, 2, 6, 6-tetramethyl-4-piperidone serving as a raw material and hydrogen peroxide to obtain a free radical intermediate II, performing alkylation reaction on the free radical intermediate II and cyclohexene to obtain an N-alkoxy piperidone intermediate as shown in a formula III, and preparing the N-alkoxy hindered amine light stabilizer Tinuvin 152 by using the N-alkoxy hindered amine light stabilizer Tinuvin 152. The intermediate and n-butylamine are subjected to hydrogenation reduction under the catalysis of 10% palladium on carbon, and 1-cyclohexyloxy-4-(n-butylamino)-2, 2, 6, 6-tetramethylpiperidine shown in the formula IV is prepared. Then carrying out substitution reaction on the formula IV and cyanuric chloride to obtain a disubstituted intermediate V with high selectivity; reacting the intermediate V with ethanolamine at a high temperature to prepare an N-alkoxy hindered amine light stabilizer Tinuvin 152; the intermediate product obtained by the process is high in yield, good in purity, short in reaction time, simple in post-treatment and convenient to operate; the product can effectively absorb ultraviolet rays, material aging and discoloration are prevented, and the service life of the product is prolonged.

The invention discloses a method for measuring the content of isocyanate groups in a polyurethane prepolymer. The method comprises the following steps: measuring dry xylene for later use; weighing a proper amount of polyurethane prepolymer, dissolving the polyurethane prepolymer in xylene, adding a di-n-butylamine-xylene solution, uniformly mixing, and standing; adding isopropanol and standard hydrochloric acid into the mixed solution for mutual dissolution; adding a bromocresol blue indicator and fully oscillating; titrating with a hydrochloric acid standard solution until the terminal color turns yellow from blue, and meanwhile, carrying out a blank experiment; finally, the content of isocyanate groups in the polyurethane prepolymer is obtained through a calculation formula. The mass ratio of the polyurethane prepolymer to the xylene is (0.1-1): (8-12), the mass ratio of the polyurethane prepolymer to the di-n-butylamine-xylene solution is (0.1-1): (9-12), and the mass ratio of the polyurethane prepolymer to the isopropanol is (0.1-1): (18-22). The method is easy and convenient to operate, accurate in measurement, high in reliability and suitable for quality control in the production and application process of the polyurethane prepolymer.

The invention discloses a method for improving the performance of a solar cell by optimizing a wide-band-gap perovskite buried interface by using n-butylamine methyl sulfonate, and the cell is a formamidine-cesium-based mixed halogen perovskite solar cell. The perovskite solar cell sequentially comprises a conductive substrate, a hole transport layer, a self-assembly monomolecular layer, a passivation layer, a broadband gap perovskite light absorption layer, an electron transport layer, a buffer layer and a metal electrode from bottom to top, and the passivation layer is prepared by spin-coating an isopropanol solution containing n-butylamine methyl sulfonate and Al2O3 or SiO2, and heating and annealing at 100 DEG C. The problems that in the prior art, Al2O3 isopropanol dispersion liquid is prone to agglomeration, and a formed passivation layer is poor in uniformity are solved, the n-butylamine methyl sulfonate is doped into Al2O3 or SiO2 nanoparticles, the prepared passivation layer is more uniform, a wide-band-gap perovskite buried interface is optimized, uniform deposition and crystallization of a perovskite film are promoted, and the performance of a solar cell is improved.

The invention relates to a production method for improving photo-thermal stability of a chloromethyl ethyl ether industrial product, and belongs to the technical field of chloromethyl ethyl ether processing.The preparation of an intermediate 1 comprises the steps that 80-120 mL of ethyl alcohol, 20-25 g of 3, 5-di-tert-butyl-4-hydroxybenzaldehyde and 6-10 g of n-butylamine are added into a 250 mL four-opening bottle provided with a backflow water diversion device, the temperature is increased to 60 DEG C, a reaction is carried out for 1 h, and an intermediate 2 is obtained; cooling to 0 DEG C by adopting an ice salt bath, adding 1-3g of potassium borohydride in batches, keeping the temperature at 0 DEG C, continuing to react for 0.5 hour, and adding a 5% citric acid aqueous solution to adjust the pH value to 2.0-3.0; the special photo-thermal stabilizer is synthesized and compounded with the epoxidized soybean oil, a single stabilizer and a special formula free of chloromethyl ether are generally adopted in the traditional method, the photo-thermal stabilizer containing the hindered phenol and piperazine structure is synthesized by the method, synergistic protection of light shielding, thermal stability and acid capture is achieved after compounding, and the product performance is remarkably improved; and the purity retention rate is 95-97% after 168h of ultraviolet aging.

The invention belongs to the technical field of antibiosis and mildew prevention, and particularly relates to an antibiosis and mildew prevention material and a preparation method and application thereof. The antibacterial and mildew-proof material comprises the following components in percentage by mass: 0.01%-1% of a mildew-proof agent, 0.1%-5% of sustained-release micelles, 0.03%-1.5% of a cross-linking agent, 10%-20% of acrylic acid slurry and 75%-85% of water, wherein the mildewproof agent is iodopropynyl n-butylamine formic ester; the mixed monomer of the sustained-release micelle is an acrylate compound and quaternary ammonium salt; and the cross-linking agent is polyhydroxy melamine. According to the antibacterial and mildew-proof material and the preparation method thereof, the problem that the antibacterial and mildew-proof performance of a filter element fabric is obviously reduced in the using process is solved, and the filter element fabric has lasting and efficient antibacterial and mildew-proof performance.

The invention discloses a method for deeply converting CO2 into acetaldehyde and crotonaldehyde, and belongs to the technical field of conversion of acetaldehyde and crotonaldehyde, and the method comprises the following steps: S1, taking one or a mixture of more of melamine, urea and dicyandiamide as a precursor, dissolving the precursor in an aqueous solution under a heating condition, and uniformly stirring until the precursor is completely dissolved; s2, adding one or more of deprotonation agents including triethylamine, isopropanolamine, 1-methylimidazole, n-butylamine, pyridine and tetramethylammonium hydroxide, mixing, and uniformly stirring; s3, placing in a hydrothermal reaction kettle, reacting under given temperature and time conditions, and cooling to room temperature; s4, carrying out centrifugal washing, drying and calcining to obtain polymeric carbon nitride with a crystal / amorphous interlaced interface; according to the method, other hydrogenation steps of the intermediate in the CO2 conversion process are inhibited, and on the basis of high yield and selectivity of acetaldehyde, C-C chain growth is further carried out to generate crotonaldehyde.

The application discloses a kind of lead sulfide quantum dots with adjustable light absorption range, preparation method and application thereof.Sulfur source is dissolved in short-chain amine solvent, lead source and organic small molecule ligand solution dissolved in organic polar solvent are added, and then sulfur source solution is added, and the reaction is stirred at a temperature of 0-100 DEG C to obtain a reaction product;anti-solvent is added, and the product is washed and dried to obtain lead sulfide quantum dots with uniform particle size and adjustable light absorption range.By adjusting the content of precursor, reaction solvent and temperature, and under the action of n-butylamine, PbS quantum dots with adjustable light absorption range are directly synthesized in one step, which solves the limitations of small light absorption range and low yield of quantum dot ink direct synthesis, and obtains quantum dots with a light absorption range of 1000nm-2000nm wavelength.The synthesized quantum dots have achieved preliminary application in photoelectric detector.

The application provides a separation and purification system and process for energy coupling variable pressure refining of butylamine, which comprises atmospheric azeotropic distillation of butylamine raw material containing water to separate a first distillate and a first still residue; pressure azeotropic distillation of the first distillate to separate a second distillate and a first target product; refluxing of the second distillate and atmospheric azeotropic distillation with the first still residue and butylamine raw material containing water to separate a third distillate and a third still residue, wherein the third still residue comprises n-butylamine, di-n-butylamine and tri-n-butylamine; distillation of the third still residue to separate a second target product, a third target product and a fourth target product; and the reaction conditions are selected from at least one of the following: a reflux ratio of 1.6-3.0 and a temperature of 43-63 DEG C for the atmospheric azeotropic distillation; and a reflux amount of 535 kg / h-2470 kg / h for the second distillate. The system and process of the application can greatly reduce equipment and operation costs on the basis of obtaining high-purity n-butylamine, di-n-butylamine and tri-n-butylamine products.

The application provides a MWW structure molecular sieve and a preparation method and application thereof. The preparation method comprises the following steps: mixing an aluminum source, water, an alkali source, a first template agent, a second template agent, a silicon source and seeds to form a gel, and crystallizing the gel to obtain the MWW structure molecular sieve; wherein the first template agent comprises cyclohexylamine, and the second template agent comprises at least one of diisopropylamine, di-n-butylamine, diisobutylamine, 1,4-diazabicyclo[2.2.2]octane, 1,6-hexanediamine and N,N,N,N-tetramethyl-1,6-hexanediamine. The application further provides the MWW structure molecular sieve prepared by the above preparation method and the application of the MWW structure molecular sieve. According to the application, the MWW structure molecular sieve can be directly synthesized without using hexamethyleneimine, piperidine and homopiperazine by the method of seed and two template agents assisting crystallization.

The application discloses a method for synthesizing molecular sieve by using rice hull as a silicon source and a template, and comprises the following steps: (1) soaking rice hull powder in a hydrochloric acid solution, then heating the rice hull powder in an oil bath to remove impurities, then washing the obtained suspension with deionized water until neutral, and then drying the suspension in an oven; (2) grinding and mixing the material obtained in the step (1), a structure directing agent, NaAlO2 and NaOH uniformly, and then crystallizing, wherein the structure directing agent is tetrapropylammonium hydroxide and / or n-butylamine; (3) high-temperature calcining the material obtained in the step (2) to remove organic cellulose and template components, and thus the molecular sieve is obtained. The application effectively solves the problems of large wastewater discharge and high cost in the preparation process of traditional molecular sieve.

The invention discloses a preparation method and application of a low-silicon SAPO-34 molecular sieve. Comprising the following steps: mixing an aluminum source, a phosphorus source, a silicon source, a template agent R1, a template agent R2 and water to obtain initial gel, wherein the molar ratio of Al2O3 to P2O5 to SiO2 to R1 to R2 to H2O in the initial gel is 1.0: (0.5-3.0): (0.01-0.3): (0.5-8.0): (0.01-2.0): (20-200); r1 is at least one of diethylamine, triethylamine, di-n-propylamine, diisopropylamine, n-butylamine, morpholine, cyclohexylamine, piperazine and tetraethylammonium hydroxide; r2 is at least one of diethylenetriamine, triethylene tetramine, tetraethylenepentamine, pentaethylenehexamine and polyethylene polyamine; heating and crystallizing the initial gel under a closed condition to obtain a crystallized product; and separating and drying the crystallized product to obtain the molecular sieve. The method is simple in process, good in repeatability and beneficial to large-scale industrial production.

The invention relates to a wear-resistant artificial leather composition with excellent flame retardance and a preparation method thereof. The wear-resistant artificial leather composition comprises artificial leather and a flame-retardant layer, the artificial leather is prepared from the following components in parts by mass: 10 to 80 parts of volcanic ash, 23 to 30 parts of ceramic micro powder, 8 to 15 parts of sodium bicarbonate, 3 to 5 parts of flame retardant, 10 to 20 parts of hydrogenated rosin glyceride, 20 to 30 parts of tannic acid, 15 to 20 parts of n-butylamine, 30 to 50 parts of hexamethylene diisocyanate, 1 to 3 parts of bacteriostatic agent, 15 to 35 parts of thermosetting resin, 10 to 25 parts of red phosphorus, 7 to 15 parts of zinc stearate and 15 to 20 parts of flame-retardant fiber. The flame-retardant layer is formed by coating the surface of the artificial leather with a flame-retardant coating, and the flame-retardant coating comprises a flame-retardant nanofiller, ethylene propylene diene monomer, polyvinyl chloride, an acrylic emulsion, ammonium polyphosphate, dipentaerythritol and melamine. The flame retardant artificial leather has the effect of improving the flame retardant property of the artificial leather.

The application discloses a kind of molybdenum bis (dibutyl dithiocarbamate) oxide and preparation method thereof, comprising the following steps: molybdenum trioxide, phase transfer catalyst and water are uniformly mixed, are sent into first-stage mixing reactor, sodium hydrosulfide, sodium thiosulfate and water are uniformly mixed, also are sent into first-stage mixing reactor, and first reaction solution is obtained by reaction;Di-n-butylamine and water are uniformly mixed, are sent into second-stage mixing reactor, carbon disulfide is simultaneously sent, and second reaction solution is obtained by reaction;First reaction solution, second reaction solution are respectively sent into third-stage mixing reactor and are reacted, obtain molybdenum bis (dibutyl dithiocarbamate) oxide solution, solid-liquid separation, drying, obtained immediately.The yield of product obtained by the application is high, the purity is high, the quality is stable, the whole reaction process is continuously carried out in airtight container, there is no gas volatilization, which is conducive to environmental protection, reaction solvent is water, resource consumption is less, can be recycled, clean and environmentally friendly.

The invention provides a flame-retardant resin composition with remoldability and a preparation method thereof. The flame-retardant resin composition with remoldability comprises epoxy resin, a flame retardant, linear dicarboxylic acid and a catalyst. The epoxy resin comprises bisphenol A diglycidyl ether. The flame retardant comprises a dicarboxylic acid structure chain segment and a structure chain segment as shown in a formula (1). The linear dicarboxylic acid is represented by formula (2). The catalyst comprises di-n-butylamine. The ratio of the mole number of the epoxy resin to the total mole number of the flame retardant and the linear dicarboxylic acid is 1: 0.9-1: 1.1. Wherein n is an integer from 4 to 10. Based on high strength, flexibility, remoldability and flame retardance provided by the resin composition, the resin composition disclosed by the invention is suitable for being used as a functional reinforcing material of flexible materials such as fibers or cloth and the like, and is convenient to recycle and reuse so as to adapt to sustainable development of low-carbon, regenerative and cyclic environmental protection.

The invention provides a method for synthesizing n-butyl isocyanate by gas-phase salifying, which comprises the following steps of: mixing n-butylamine vaporized gas and hydrogen chloride gas, and performing salifying reaction on the n-butylamine vaporized gas and the hydrogen chloride gas to obtain a salifying product n-butylamine hydrochloride; mixing the obtained n-butylamine hydrochloride with a solvent to obtain a reaction suspension; mixing the reaction suspension with phosgene to obtain a reaction material, introducing the reaction material into a reactor, and sequentially carrying out reactions in a first reaction stage, a second reaction stage and a third reaction stage through temperature control to obtain a reaction mixed material; and separating impurities in the reaction mixture obtained by the phosgenation reaction to obtain the n-butyl isocyanate. By utilizing the method provided by the invention, the generation of byproducts in the preparation process of the n-butyl isocyanate can be effectively reduced, so that the reaction efficiency and the yield of the n-butyl isocyanate can be further improved. The method effectively solves the problems of low synthesis efficiency, more byproducts and high energy consumption in the synthesis process of the n-butyl isocyanate.

The utility model provides a continuous flow reactor for synthesis of tetrabutylurea, which comprises a reactor body, an upper mixing zone, a reaction zone and a lower mixing zone are arranged in the reactor body in a separating manner, and the reactor body is provided with a tetrabutylurea discharge port, a phosgene feed port, a liquid caustic soda feed port and a di-n-butylamine feed port. A gas distribution plate is arranged in the lower mixing area to divide the lower mixing area into a lower material distribution area and a discharging area, annular phosgene gas distribution pipes are distributed on the gas distribution plate, the phosgene feeding port is connected with the phosgene gas distribution pipes, and a tetrabutyl urea discharging channel is formed in the lower partition plate; phosgene one-way inlet valves are distributed on a bottom plate of the lower partition plate; a material distribution plate is arranged in the upper mixing area to divide the upper mixing area into an upper material distribution area and an upper mixing area, a liquid caustic soda material distribution pipeline and a di-n-butylamine material distribution pipeline are distributed on the material distribution plate, and a plurality of mixed feeding holes are distributed in an upper partition plate; the temperature rise of phosgene is converted into a gas phase from a liquid phase, the phosgene reacts with di-n-butylamine, the di-n-butylamine moves from top to bottom, and the continuous flow reaction can improve the utilization rate of raw materials and increase the yield.

The present invention discloses a weather-resistant unsaturated polyester resin, its preparation method and application in photovoltaic, which relates to the technical field of polymer materials. When preparing the weather-resistant unsaturated polyester resin in the present invention, 1,6-hexanediol, itaconic acid and an ultraviolet absorption monomer are subjected to esterification polycondensation to obtain an unsaturated polyester; naringenin and 4-isocyanate-tetramethylpiperidine oxide are reacted to obtain a functional crosslinking agent; 3-(4-chlorophenyl)phosphine, 2,2'-thiobis(4-chlorophenol) and 2-butene-1,4-diamine are reacted, and polymer-coated on silica to obtain pre-modified silica; the pre-modified silica, n-butylamine and nickel acetate are reacted to obtain modified silica; the unsaturated polyester, the functional crosslinking agent and the modified silica are mixed evenly and injection-molded to obtain the weather-resistant unsaturated polyester resin. The weather-resistant unsaturated polyester resin prepared by the present invention has excellent anti-aging, flame retardant, self-repairing and mechanical properties.