166 results about "Butylamine" patented technology

The invention relates to the technical field of biodegradable materials, and particularly discloses a BBM-added bamboo powder biodegradable material and application thereof in beer bottles. The BBM-added bamboo powder biodegradable material is prepared from the following raw materials in parts by mass: 10 to 20 parts of poly (butylene succinate), 10 to 30 parts of poly (butylene adipate-co-terephthalate), 10 to 20 parts of bamboo powder, 1 to 3 parts of dopamine hydrochloride, 0.1 to 0.5 part of n-butylamine, 1 to 2 parts of hexadecyl trimethyl ammonium bromide, 1 to 5 parts of tetraethyl orthosilicate and 1 to 2 parts of tetrabutyl titanate. 1-2 parts of 3-aminopropyltriethoxysilane, 1-2 parts of an antioxidant and 1-2 parts of a plasticizer. The BBM obtained by the invention has excellent mechanical properties, improves the anti-ultraviolet intensity of a degradable material to a certain extent, and has very good biodegradability.

The invention discloses weather-resistant unsaturated polyester resin as well as a preparation method and photovoltaic application thereof, and relates to the technical field of high polymer materials. When the weather-resistant unsaturated polyester resin is prepared, 1, 6-hexanediol, itaconic acid and an ultraviolet absorption monomer are subjected to esterification and polycondensation to prepare unsaturated polyester; the preparation method comprises the following steps: carrying out reaction on naringenin and 4-isocyanate-tetramethylpiperidine oxide to prepare a functional cross-linking agent; the preparation method comprises the following steps: reacting 3-(4-chlorphenyl) phosphine, 2, 2 '-thiobis (4-chlorophenol) and 2-butene-1, 4-diamine, and polymerizing and coating silicon dioxide to prepare pre-modified silicon dioxide; reacting the pre-modified silicon dioxide, n-butylamine and nickel acetate to obtain modified silicon dioxide; uniformly mixing unsaturated polyester, a functional cross-linking agent and modified silicon dioxide, and performing injection molding to obtain the weather-resistant unsaturated polyester resin. The weather-resistant unsaturated polyester resin prepared by the invention has excellent anti-aging, flame-retardant, self-repairing and mechanical properties.

The invention discloses clethodim diamine salt as well as a preparation method and application thereof. The stability of the clethodim diamine salt (clethodim 1, 4-butanediamine salt, clethodim 1, 5-pentanediamine salt and clethodim 1, 6-hexamethylenediamine salt) provided by the invention is superior to that of clethodim and clethodim monoamine salt (such as clethodim tert-butylamine salt); meanwhile, the herbicidal activity of the clethodim diamine salt (clethodim ethylenediamine salt, clethodim 1, 4-butanediamine salt and clethodim 1, 5-pentanediamine salt) is superior to that of clethodim tert-butylamine salt, and the herbicidal activity of the clethodim 1, 5-pentanediamine salt is superior to that of clethodim. Most clethodim diamine salt is low in degradation rate in the high-temperature heat storage process and easier to store for a long time, the clethodim diamine salt is higher in melting point than clethodim monoamine salt (such as clethodim tert-butylamine salt), granulation and smashing are more convenient, the clethodim diamine salt can be used as a herbicide to be processed into solid dosage forms such as water dispersible granules and the like, the physical performance of the preparation is better, and the preparation has good application prospects. The commercialization prospect is good.

Methods for stereo-selectively crystallizing 3-keto-5β-cholanic acid ("3-KCA") and 3-keto ursodeoxycholic acid ("3-KUDCA") of exceptional purity, salts useful in carrying out such methods, particularly the t-butylamine and cyclohexylamine salts of 3-KCA, the t-butylamine salt of 3-KUDCA, and crystalline forms of such salts, and methods of making commercial steroids from such purified materials.

The invention relates to the technical field of polyurethane thermal insulation materials, and discloses a preparation method of a nano silicon dioxide modified polyurethane thermal insulation material.The preparation method comprises the steps that 4-chloro-1-butylamine, formaldehyde and bisphenol A serve as raw materials and are subjected to a Mannich reaction to obtain an intermediate 1, and the intermediate 1 and PEPA are subjected to a substitution reaction under catalysis of pyridine to obtain benzoxazine-based double PEPA. Taking N, N-diethyl-aminopropyl methyl dimethoxy silane as a bridge, carrying out quaternization reaction with the intermediate 1, and then carrying out condensation reaction with nano silicon dioxide to obtain the benzoxazine-based double-nano silicon dioxide. Finally, polyether polyol, benzoxazine-based double nano-silica, benzoxazine-based double PEPA, a curing agent and the like are used as raw materials, stirred and mixed to be uniform, foaming forming is conducted, and the nano-silica modified polyurethane thermal insulation material is obtained. The nano silicon dioxide modified polyurethane thermal insulation material prepared by the preparation method disclosed by the invention has relatively good flame-retardant effect, antibacterial effect, mechanical property and thermal stability.

The invention relates to a solid electrolyte of organic-inorganic hybrid halogen compound molecules, preparation thereof and an all-solid-state battery, and belongs to the technical field of energy storage batteries. The chemical general formula of the solid electrolyte is MaNb + eQcXdYa + bn + cq + dxZen or MaN2b + eQcXdYa + cq + dxZenObn, wherein M is selected from one of methylamine, ethylamine, propylamine, butylamine, aniline, benzylamine and phenylethylamine; n, Q and X are different metal elements; y is selected from halogen; z is a pseudohalide ion; the value range of a, b, c, d and e is 0 lt; a < = 3, 0lt; b < = 3, 0lt; c < = 1, 0lt; d < = 1, 0lt; e < = 6; and n, q and x are values of valences of the N element, the Q element and the X element respectively. The electrolyte material disclosed by the invention has high ionic conductivity, good flexibility and machinability and excellent air stability, and a battery formed by the solid electrolyte material has excellent electrochemical performance.

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 relates to a recyclable water treatment agent based on polyaluminum chloride and a preparation method thereof, and belongs to the technical field of sewage treatment. According to the recyclable water treatment agent, hollow porous magnetic ferroferric oxide serves as a carrier, di-n-butylamine and 3-chloropropyltrimethoxysilane are used for substitution to prepare a surface treatment agent, the surface treatment agent is loaded to the surface of the carrier through the coupling effect, a tertiary amine structure in molecules of the surface treatment agent is coordinated with aluminum chloride, and the recyclable water treatment agent is prepared under the alkaline hot reflux condition. Polyaluminum chloride is formed on the surface in situ, a quaternary ammonium structure is formed by bromoethanol and tertiary amine in the polymerization process, the hollow porous carrier has good suspension dispersion capacity in sewage, and the surface quaternary ammonium structure and polyaluminum chloride form a charge neutralization-flocculation dual mechanism, so that efficient and deep purification is realized; meanwhile, quick separation and recovery can be achieved through an external magnetic field, and efficient recovery of polyaluminum chloride is achieved.

The present invention relates to a method for preparing an oil-soluble ionic liquid-carbon point eutectic, comprising the following steps: (1) preparing an ionic liquid: first adding n-butylamine to an excess of anhydrous ethanol and then dropping diisooctyl phosphate, or first adding n-octylamine and then dropping palmitic acid; then rapidly stirring the resulting solution at room temperature for 12 hours, rotary evaporation, vacuum drying, to obtain an ionic liquid diisooctyl phosphate n-butylammonium or palmitic acid n-octyl ammonium in a solid state at room temperature; (2) preparing carbon points: dodecylamine, anhydrous AlCl3 and o-dichlorobenzene oil bath pyrolysis to obtain carbon points; (3) preparing an ionic liquid-carbon point eutectic: adding 3 wt.%~10 wt.% of carbon points to the ionic liquid, then adding an excess of anhydrous ethanol, ultrasonically dissolving, vacuum drying, to obtain the corresponding ionic liquid-carbon point eutectic. At the same time, the present invention also discloses the application of the ionic liquid-carbon point eutectic. The preparation method of the present invention is simple, and has good oil solubility and room temperature fluidity as a lubricating oil additive.

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 belongs to the technical field of tert-butylamine preparation, and particularly relates to a preparation process for synthesizing tert-butylamine by adopting methyl tert-butyl ether. The preparation process comprises the following steps: preparing calcium alginate microspheres; preparing an SAPO precursor solution; performing composite crystallization; preparing an SAPO-11 carrier; preparing an ammonium type SAPO-11 carrier; preparing a metal supported catalyst; preparing an activated catalyst; methyl tert-butyl ether and liquid ammonia are used as raw materials, and tert-butylamine is prepared under the catalysis of an activated catalyst. According to the preparation process for synthesizing the tert-butylamine by adopting the methyl tert-butyl ether, the process of catalytically synthesizing the tert-butylamine by taking the methyl tert-butyl ether and the ammonia as raw materials follows an acid catalytic cracking nucleophilic addition coupling mechanism, and the prepared hierarchical pore CuZn / HSAPO11 catalyst remarkably reduces the reaction activation energy through the synergistic effect of B acid, L acid and metal active sites; high-activity and high-selectivity catalytic conversion at low temperature is realized, and high-purity tert-butylamine is prepared.

The application discloses a device and method for preparing tert-butylamine by directly ammoniating isobutene, which comprises sequentially connected raw material preparation unit, reaction separation unit, rectification separation unit and circulating recovery unit; the raw material preparation unit is used for storing, mixing and heating raw materials; the reaction separation unit is used for pressurizing reaction of the raw materials in the raw material preparation unit and gas-liquid separation of products; the rectification separation unit is used for rectification separation of liquid-phase products separated by the reaction separation unit and recovery of part of unreacted raw materials; and the circulating recovery unit is used for rectification recovery of part of raw materials of gas-phase products separated by the reaction separation unit. The application has the characteristics of low overall equipment investment, high energy utilization rate, simple product separation and purification, perfect overall device design and small environmental pollution.

This invention provides a method for synthesizing high-purity tungsten complexes, relating to the field of chemical synthesis technology. Under a nitrogen atmosphere, tungsten hexachloride and an alkane solvent are added to a reaction vessel, the temperature is lowered to 0°C, tert-butylamine is added dropwise, the mixture is brought back to room temperature with stirring, filtered, and washed to obtain a filtrate. Trimethylchlorosilane is added dropwise to the filtrate, the reaction is heated, and after returning to room temperature, pyridine is added dropwise. The reaction yields (…). t The intermediate BuN)2WCl2(py)2 is synthesized by adding toluene and dialkylamine. After reaction, the mixture is filtered, washed, the solvent is evaporated, and then distilled to obtain a high-purity tungsten complex. By optimizing the reaction conditions and raw material ratio, the synthesis method of this invention significantly improves the yield of the high-purity tungsten complex. Compared with the prior art, it effectively reduces the waste of raw materials, improves production efficiency, and successfully achieves a product metal purity of 5N, meeting the stringent requirements of the semiconductor field for product metal purity and helping to improve the performance and quality of subsequent application products.

The invention discloses a synthesis method of 4-amino-N-tert-butylbenzamide, which comprises the following steps: by taking p-aminobenzonitrile and tert-butyl acetate as initial raw materials, carrying out Ritter reaction in an acidic system to prepare the 4-amino-N-tert-butylbenzamide in one step; the acidic system is composed of an acidic solvent and an acidic catalyst; the acidic solvent is acetic acid; the acid catalyst is p-toluenesulfonic acid or sulfuric acid. The method provided by the invention not only solves the problem that the tert-butylamine and other raw materials with pungent smell need to be adopted in the prior art and are not friendly to human bodies and environment, but also avoids the problems of low safety caused by a high-risk process and high production cost caused by the need of adopting an expensive palladium catalyst in the prior art; particularly, the method is short in reaction step, simpler and more convenient to operate, more stable in process and suitable for large-scale industrial production.

The application belongs to the technical field of pharmaceutical chemistry synthesis, and specifically discloses a preparation method of oseltamivir and a phosphate thereof and an intermediate thereof, which comprises the following steps: (1) a compound of formula VII is reacted with VIII under the action of a base in a solvent to obtain an intermediate of formula VI, and then the intermediate of formula VI is reacted under the action of a strong base at high temperature to obtain formula V; (2) formula V is subjected to ring-opening reaction with tert-butylamine in a solvent under the catalysis of a Lewis acid to obtain formula IV; (3) formula IV is reacted with an acetylating agent in a solvent under the action of a base to obtain formula III; (4) formula III is reacted under the action of an acid at a certain temperature to obtain formula II; and (5) formula II is subjected to salt formation with phosphoric acid in a solvent to obtain oseltamivir. The preparation method has the characteristics of simple operation, low cost, high yield, high optical purity of the product, stable process and the like, and is suitable for industrial production.

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.

The invention discloses a Priesteria gigantea GD0038 and an application thereof in improving the flavor of weed crab sauce. The strain is deposited in the China Center for Type Culture Collection with a deposit number of CCTCC NO: M 20242548 and a deposit date of November 13, 2024. The strain is applied to the preparation of weed crab sauce, can significantly improve the flavor of the weed crab sauce, increase the content of volatile substances in the fermented weed crab sauce, and increase the content of characteristic flavor substances such as 1-penten-3-ol, 1-nonanol, isovaleraldehyde, n-hexanol, n-octanol, 3-n-decanol, 2-heptanone, and other alcohols, pyrazines, and ketones, while reducing the content of unpleasant flavor substances such as butylamine, trimethylamine, and n-hexanal. The invention has very good application prospects.

The invention discloses a method for synthesizing salbutamol sulfate, and belongs to the technical field of organic chemical synthesis. The synthesis method comprises the following steps: (1) carrying out Friedel-Crafts acylation reaction on methyl salicylate to generate an intermediate 1; (2) carrying out substitution reaction on the intermediate 1 and tert-butylamine to generate an intermediate 2; (3) carrying out reduction reaction on the intermediate 2 to generate an intermediate 3, namely salbutamol; and (4) salbutamol and concentrated sulfuric acid are salified to generate salbutamol sulfate. According to the synthetic method of the salbutamol sulfate, the process steps are shortened, the raw materials are simple and easy to obtain, multi-step column chromatography is omitted, the cost is reduced, the high-pressure hydrogenation reaction is avoided, an autoclave is not needed, common production equipment is not needed, the reaction conditions are mild, and industrial production is facilitated.

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 present invention provides a method for preparing terbutaline, which relates to the technical field of chemical synthesis. The method for preparing terbutaline comprises the following steps: (a) Compound 1 reacts with haloepoxyethane through Suzuki reaction to obtain Compound 2; (b) Compound 2 reacts with tert-butylamine to obtain terbutaline. The present invention creatively applies the Suzuki reaction to the preparation of terbutaline, greatly shortening the reaction steps, avoiding the use of bromination reaction, the processes of protecting and deprotecting the protecting group on the hydroxyl group, and also eliminating the need for catalytic hydrogenation. The reaction conditions are mild, the reaction process is easy to control, and the safety factor is high. The raw materials are simple and easily available, saving the industrialization cost. The product has a high yield and high purity, providing a process route for industrial production of products with higher quality.

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 invention provides an engineering bacterium for producing spermidine and a preparation method of the engineering bacterium, and relates to the field of genetic engineering. According to the invention, arginine decarboxylase, aspartate kinase, aspartate-semialdehyde dehydrogenase, spermidine efflux protein (MdtI / MdtJ), carboxylaminopropyl agmatine dehydrogenase (CAPADH), carboxylaminopropyl agmatine decarboxylase (CAPADC) and aminopropyl agmatine urea hydrolase (APAUH) are subjected to overexpression in escherichia coli by using a gene engineering technology, and then the escherichia coli is subjected to enzyme deactivation, so that the escherichia coli is obtained. The genetically engineered bacterium capable of producing the spermidine can be obtained by simultaneously knocking out a spermidine transport system (PotBCAD), a spermidine-N-acetyltransferase (spermidine-N-acetyltransferase) and a homoserine dehydrogenase (homoserine dehydrogenase), so that the genetically engineered bacterium capable of producing the spermidine can be obtained. The engineering bacterium greatly reduces the production cost of spermidine, has a wide application prospect, and lays a foundation for green production of spermidine.

The present invention belongs to the technical field of the preparation of tert-butylaminoethoxyethanol, and particularly relates to a method for catalytically synthesizing tert-butylaminoethoxyethanol. The process method comprises the following steps: (1) preparing an aluminum-cerium composite sol; (2) preparing a CeO 2 -Al 2 O 3 support; (3) preparing a Co-Ni-Mo / CeO 2 -Al 2 O 3 catalyst; (4) feeding the reaction raw materials composed of tert-butylamine and diethylene glycol into a preheating vaporizer, mixing with hydrogen, preheating and vaporizing, and then entering a fixed-bed reactor for reaction. The fixed-bed reactor is filled with Co-Ni-Mo / CeO 2 -Al 2 O 3 catalyst. After the reaction, the reaction materials are condensed and subjected to gas-liquid separation, and the obtained liquid phase is separated and purified by distillation to prepare tert-butylaminoethoxyethanol. The method for catalytically synthesizing tert-butylaminoethoxyethanol according to the present invention has mild reaction conditions and high raw material conversion rate, and can realize industrial production.

The application discloses a preparation method of bacteriostatic and deodorant plastic and relates to the technical field of plastics. The self-prepared antibacterial agent is prepared by using triethoxysilane butyraldehyde, 4-chloro-1-butylamine and (R)-2-(dimethylamino) propionamide, the Schiff base structure and the quaternary ammonium structure in the molecular chain of the self-prepared antibacterial agent interact, bacterial growth is effectively inhibited, and then the antibacterial and deodorant properties of the plastic are improved; then porous calcium silicate and porous calcium carbonate are used as deodorant fillers of the plastic, the self-prepared antibacterial agent is used as a crosslinking agent, the fillers and the urea-formaldehyde resin are combined with each other, the uniform dispersion of the fillers is facilitated, meanwhile, a crosslinked network structure is formed in the plastic, and the mechanical properties of the plastic are greatly improved.

The invention discloses an antibacterial polyester fiber and a preparation method thereof, and relates to the technical field of high polymer materials. When the antibacterial polyester fiber is prepared, 1, 3, 5, 7-tetramethylcyclotetrasiloxane, solid super acid and 1, 3-bis (hydroxypropyl) tetramethyldisiloxane react to prepare hydroxyl-terminated methyl hydrogen-containing silicone oil, and then the hydroxyl-terminated methyl hydrogen-containing silicone oil reacts with dimethyl terephthalate and ethylene glycol to prepare polysiloxane copolyester; the preparation method comprises the following steps: carrying out phosphorus-hydrogen addition modification on polysiloxane copolyester and diphenyl (4-vinyl phenyl) phosphine, and then carrying out quaternary phosphonium modification on the modified polysiloxane copolyester and 4-bromine-butylamine hydrobromide to prepare antibacterial modified copolyester; preparing ZIF-8 powder and loading an anti-aging agent; and finally, mixing the antibacterial modified copolyester and the ZIF-8 loaded with the anti-aging agent, melting and spinning to prepare the antibacterial polyester fiber. The antibacterial polyester fiber prepared by the method has excellent antibacterial, flame-retardant and antioxidant properties and the like.

The invention discloses a chloride ion-doped micron-sized transverse-size porous CuO nanosheet and a preparation method thereof, and belongs to the technical field of micron / nano material preparation and electro-catalysis CO2 reduction. According to the preparation method, copper acetate is taken as a copper source, potassium chloride is taken as a chlorine source, organic alkali n-butylamine is taken as an alkali source, and a homogeneous precipitation-heat treatment method is adopted, so that the chlorine ion doped micron-sized transverse-size porous CuO nanosheet is prepared; the method is simple in process, low in cost, good in repeatability and easy to amplify production, when the product is used for electrocatalytic CO2 reduction, CO2 is efficiently catalyzed to be converted into high-added-value industrial raw material ethylene, and the product has wide application prospects in the fields of energy conversion and carbon dioxide resource utilization.

The present invention provides a production process for directly catalytic amination of isobutene to synthesize tert-butylamine. The production process of the present invention includes the steps of: mixing ZSM-5 zeolite with an aqueous solution of a soluble metal salt, and adjusting the pH to 3-6; after reflux adsorption and washing with water until neutral, drying to obtain a catalyst powder; mixing the catalyst powder, a binder, and an aqueous nitric acid solution uniformly to obtain a mixture, and through crystallization treatment, shaping, drying, and calcination, a molecular sieve catalyst doped with a metal element is obtained; under the catalysis of the molecular sieve catalyst doped with a metal element, liquid ammonia and isobutene undergo an amination reaction, and then tert-butylamine is obtained through purification. The present invention uses a molecular sieve acidic catalyst doped with a metal element to directly aminate isobutene and liquid ammonia in a liquid phase state to generate tert-butylamine; the catalyst of the method of the present invention has high catalytic efficiency, long catalyst life, low reaction temperature, high isobutene conversion rate, and high tert-butylamine selectivity.

To provide a bee repellent in order to prevent damage to honeybees, which are not the intended target of pesticides applied to crops or pesticides used to control carnivorous bees such as hornets and paper wasps. [Solution] A bee repellent comprising one or more components selected from tetradecane, furfuryl alcohol, cinnamyl alcohol, cinnamaldehyde, 3-methyl-2-butenal, methyl cinnamate, geranyl formate, allyl cyclohexanepropionate, isoquinoline, borneol, carvacrol, δ-dodecalactone, β-ionone, quinoline, butylamine, and citronella oil as active ingredients.

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.