55 results about "Butyl formate" patented technology

The invention discloses composite spherical activated carbon added with polyester fibers and capable of improving mechanical strength. The composite spherical activated carbon is characterized by being prepared from raw materials in parts by weight as follows: 42-46 parts of cyclohexyl acrylate, 39-42 parts of alpha-methyl styrene, 25-28 parts of butyl formate, 2-3 parts of azodiisobutyronitrile, 2-2.5 parts of ethylene glycol dimethacrylate, 2-3 parts of gelatin, 1-1.5 parts of sodium metabisulfite, a proper amount of distilled water, a proper amount of acetone, 25-28 parts of sulfonated asphalt powder, 4-5 parts of the polyester fibers, 1-2 parts of a silane coupling agent kh560, 2-3 parts of graphene and 1-2 parts of sodium alginate. According to the composite spherical activated carbon, the polyester fibers and the graphene are added to an asphalt coating liquid, through a series of modification, the compound components can form a porous three-dimensional structure, the adsorbability of the composite spherical activated carbon to oil substances can be further improved, and the mechanical strength of an asphalt base can also be enhanced. The composite spherical activated carbon is high in purity, low-dust, abrasion-resistant, easy in flowing, easy to fill and broad in application prospect.

The invention relates to a synthesis of a novel coal flotation agent. The synthesis includes adding concentrated acid into phthalic anhydride and n-butyl alcohol dropwise slowly, slightly boiling a reaction mixture, when the reaction mixture is cooled to 30-70 DEG C, neutralizing the reaction mixture via a sodium carbonate solution till an organic layer is neutral, removing the excess n-butyl alcohol and water by means of reduced pressure distillation after separation, adding diethanol amine into an oil bath pan dropwise slowly with heating and stirring, and removing the unreacted n-butyl alcohol and diethanol amine by means of reduced pressure distillation after cooling so as to obtain o-butyl formate benzoic acid alkanolamide, namely the novel coal flotation agent. The defects that an existing coal flotation agent only has a signal floatation function and a foaming agent needs to be added additionally are overcome. The novel coal flotation agent has the floatation function as well as a foaming function, and is simple in preparation method, low in cost and high in floatation efficiency.

The invention discloses a conductive nano fluorocarbon coating which is prepared by mixing the raw materials by weight percent: 16-30% of modified nanocarbon tube, 4-10% of modified nanocarbon fiber, 40-60% of polyvinyl fluoride resin, 5-10% of 1-nitro-pyrrolidone, 10-20% of iso-butyl formate, 2-5% of dimethylbenzene, 1-5% of propylene diester diacetate, 0.25-1% of polydimethyl siloxane and 0.25-1% of polymethyl phenyl siloxane. The coating has the advantages that (1) the adding quantity of conductive filler reaches up to 40%, so that the adding quantity is greatly increased; (2) the high temperature resistance and the heat stability are greatly improved, so that the coating can endure large current shock; (3) the coating has excellent corrosion resistance and especially can resist the corrosion of acid soil, so that the service life of the coating reaches 20 years; (4) the coating is good in performances and high in cost performance; (5) the coating is widely applied to corrosion prevention of a grounding grid of a large transformer substation.

The invention relates to 1,2,3,4-tetrahydroquinoline compound and a synthetic method and application thereof. In a structure formula of the compound, the R1 is nitro or trifluoromethyl or 3-nitrophenylnitrobenzene sulfonyl or cyano, the R2 is hydrogen or methyl, the R3 is methyl formate or butyl formate, and the R4 is methyl. An aromatic ring of the 1,2,3,4-tetrahydroquinoline compound contains a series of electron withdrawing groups. The synthetic method is simple, economical, environment-friendly, easy to operate, easy to control, higher in product purity and yield and good in development prospect in industrial production; in addition, the synthetic method is also a novel synthetic method in atom economy; furthermore, the 1,2,3,4-tetrahydroquinoline compound can serve as intermediate to be used for preparing antagonist medicine.

The invention provides an extraction method and a purpose of jute fiber extracts with bacteriostatic activity and relates to the extraction method and the purpose of fiber extracts of jute of tiliaceae jute plants. The extraction method provided by the invention overcomes the defects of low raw material yield, low bacteriostatic activyt of extracts and easy activity loss of the existing jute extraction process. The invention provides an extraction process of ester solvents, which adopts the high-yield jute fibers as extraction raw materials, the ester solvents refers to one kind of materials or several kinds of materials from n-butyl acetate, acetic acid isopropyl ester, n-propyl acetate, iso-butyl formate, n-butyl formate, ethyl acetate and methyl acetate with the dielectric constant being 5.0 to 7.5. The extracts obtained by adopting the extraction method have the advantages that the bacteriostatic activity, particularly the escherichia coli inhibiting activity is obviously improved, and the advantage of stable bacteriostatic effect can also be realized when the extracts are used as bacteriostatic agents, particularly as bacteriostatic finishing agents for textiles.

The invention relates to a method for preparing toluene diamino butyl formate, which comprises the following steps: adding toluene diamine, urea, butanols and a catalyst in a reaction vessel, wherein the mol ratio of the reaction components is characterized in that toluene diamine to urea to butanols is 1:2-10:10-90, and the catalyst amount accounts for 5%-60% of mass of toluene diamine, sealing the reaction vessel after charging, under the stirring condition, heating to the temperature of 130-250 DEG C for reacting for 1-10 hours, cooling after finishing the reaction, discharging, filtering and separating the catalyst at the temperature of 30-90 DEG C to obtain the products toluene diamino butyl formate. No material addition and removal is provided during the reaction period, the operation is convenient by only requiring reaction temperature control; the reaction condition is mild; the used catalyst has the advantages of low price, high catalytic activity and high yield of the product as high as 81.8%; the catalyst and the reacted material are easy to be separated, the catalyst enables no deactivation and good repetitive usability.

The invention discloses a synthetic method of bis-4-(1H-pyrazol-1-yl) piperidine-1-tert-butyl formate and an application thereof. The bis-4-(1H-pyrazol-1-yl) piperidine-1-tert-butyl formate is prepared through a methyl sulfonylation reaction, a hydrocarbylation reaction, a Grignard reaction and a Suzuki coupling reaction by taking cheap and easily available N-Boc-4-hydroxyl piperidine as a raw material. The synthetic method is simple, the process is easy to control, and the yield of the prepared bis-4-(1H-pyrazol-1-yl) piperidine-1-tert-butyl formate is 86.7%; bis-4-(1H-pyrazol-1-yl) piperidine-1-tert-butyl formate can be used as a standard substance to detect and monitor synthesis of crizotinib. The synthetic method disclosed by the invention is suitable for synthesizing bis-4-(1H-pyrazol-1-yl) piperidine-1-tert-butyl formate and the synthesized substance is used for detecting and monitoring synthesis of crizotinib.

The invention provides a polyester fabric dyeing method which solves the technical problems that an existing dyeing method is simple and rough, dyeing cannot be performed by a dyeing device, dyeing isnon-uniform and the like. The dyeing method includes the steps: S1 performing pretreatment including fabric preparation, singeing, desizing, scouring, bleaching and mercerizing on a fabric; S2 sequentially adding 0.8-1.5 parts by weight of benzoyl peroxide butyl formate, 1.6 parts by weight of anhydrous sodium sulphate, 2.8 parts by weight of hydroxypropyl methyl cellulose, 2.6 parts by weight ofacrylic ester and 45 parts by weight of plant dyes into 160 parts by weight of deionized water, and heating the materials to reach the temperature of 50 DEG C to obtain a semi-finished dye. The dyeing method has the advantage of dyeing uniformity.

The invention discloses an anti-radiation power distribution cabinet. The anti-radiation power distribution cabinet comprises a cabinet body; the cabinet body is provided with a surface coating layer, a first steel plate layer, a first adhesive layer, an anti-radiation layer, a second adhesive layer, a second steel plate layer and a back coating layer from top to bottom in sequence, wherein the surface coating layer comprises epoxy resin, acetylene-hydroxyethyl acrylate copolymer, p-nitrophenyl butyl formate, and neodymium oxide; the anti-radiation layer comprises metal oxide, triphenyl phosphate, p-phenylenediamine and styrene; and the back coating layer comprises epoxy resin, propylene-hydroxyethyl acrylate copolymer, dibutyl terephthalate and ytterbium oxide. The anti-radiation power distribution cabinet provided by the invention has a good anti-radiation effect, high flame retardancy, and safety and reliability.

The invention discloses a circuit board cleaning agent with excellent cleaning performance. The circuit board cleaning agent is prepared from the following raw materials in parts by weight: 18 to 25 parts of butyl acetate, 5 to 10 parts of ethanolamine, 8 to 10 parts of polyaspartic acid, 9 to 14 parts of cyclohexane, 6 to 12 parts of diisobutyl ketone, 3 to 9 parts of phosphonic carboxylic acid, 7 to 11 parts of sodium ethoxylated alkyl sulfate, 2 to 8 parts of certain substance, 2 to 4 parts of o-phenylenediamine, 3 to 8 parts of dodecyl glucoside, 5 to 10 parts of methyl isobutyl ketone, 8 to 12 parts of diethylene glycol monoethyl ether, 5 to 10 parts of surfactant, 9 to 14 parts of fatty alcohol-polyoxyethylene ether, 6 to 8 parts of butyl formate and 6 to 8 parts of antioxidant. The circuit board cleaning agent disclosed by the invention is good in stability; any damage to a circuit board is avoided, the damage to electronic parts and components on the circuit board is also avoided, and stains attached to the circuit board can be thoroughly removed; the circuit board cleaning agent has the advantages of better degreasing effect, higher cleaning efficiency, wider application range, certain biodegradability and less pollution to the environment.

The invention relates to a multifunctional PVC pipe for electric power construction. The PVC pipe is composed of the following components: phenolic resin, diisopropanolamine, dicumyl peroxide, iodopropynyl butyl carbamate, cinnamaldehyde, isothiazolinone, tea polyphenol, sodium diacetate, montmorillonite powder, triazine resin, phenothiazine, zirconium silicate powder, linseed alkyd resin, polybutylene terephthalate, acrylamide, PVC resin powder, zinc phosphate, polyacrylic acid, titanium dioxide, cylindrin, arabinogalactan, propyl paraben, copper pyrithione, melamine cyanurate, vancomycin, cyclohexanone, lumisterin, zirconium dioxide powder, silicon carbide powder, kaolin, and linseed oil. The ingredients mentioned above are mixed together to form a novel composite toughened and enhanced system, the performance indexes such as toughness, rigidity, elastic modulus, and the like, are good; the anti-aging performance and using property of product are largely improved, and the anti-corrosion effect is good.

The invention discloses a kind of synthetic method of amido-protecting reagent, nitrine formic acid tert-butyl ester. The method chooses the tert-butyl alcohol as the starting material and gets the target product after three reactions with other facile raw materials having low toxicity. The invention is featured by facility of the raw material, simple routes, low toxicity, easy characterization and moderated gross yield.

The invention belongs to the field of sweet-orange essence preparation methods, and relates to a preparation method for sweet-orange essence. The method comprises the following steps: S10, proportioning raw materials; S20, performing production through throwing the proportioned raw materials; and S30, obtaining the finished product sweet-orange essence. In the S10, the raw materials and proportions (in percent by weight) are as follows: 0.022-0.03% of ethyl acetate, 0.022-0.03% of limette oil, 0.04-0.05% of acetic acid, 0.12-0.18% of Brazil sweet-orange oil, 0.21-0.29% of butyl formate, 0.21-0.29% of ethyl maltol, 0.15-0.18% of butyric acid, 0.31-0.39% of decanoic acid, 5-7% of sweet-orange tincture, 13-15% of vanillin, 22-27% of sweet-orange peel extractum, 16-19% of propylene glycol, and the balance of distilled water. According to the invention, the sweet-orange essence is prepared from the above raw materials according to the above proportions, thus a sweet-orange tropical fruit taste is guaranteed, and a fresh and sweet taste is increased at the same time; and solid is dissolved in advance, thus volatilization of the small-proportion raw materials can be avoided.

The invention provides a method for synthesizing propionate through an ester-ester exchange path and relates to a method for synthesizing the propionate. According to the method, reaction raw materials include, but are not limited to ethyl formate, propyl formate, butyl formate, ethyl acetate, propyl acetate, butyl acetate and the like; the method for synthesizing the propionate through an ester exchange one-step method is adopted. A catalyst comprises alkaline materials including ionic liquid, soluble strong base, solid base and the like respectively; the catalyst has the advantages of high catalysis efficiency and no pollution. By taking methyl propionate and ethyl acetate reaction as an example, KOH is used as the catalyst, the mol ratio of the raw materials is 1 to 1, the reaction temperature is 60 DEG C and the reaction time is 5 min; the conversion ratios of the methyl propionate and the ethyl acetate can reach 70 percent or more; products comprise ethyl propionate and the methylacetate. The whole reaction path has the characteristics of short synthetic route, simple technological flow and high yield and the catalyst is stable, does not become inactive and can be repeatedlyutilized.

The invention discloses a synthetic method of 4-(6- aminopyridine-3-yl) piperidine-1-tert-butyl formate. According to the method, fluorenylmethyl-N-(5-bromopyridine-2-yl) carbamate and isopropyl magnesium chloride lithium chloride are subjected to halogen / magnesium exchange to generate a Grignard reagent, then the Grignard reagent and N-tertbutyloxycarboryl-4-piperidone are subjected to addition, an addition product is reduced by triethylsilane, and deprotection is performed under an alkaline condition to obtain a target product. The method has the advantages of simple steps, no special reactions such as ultralow temperature, high temperature, high pressure, catalytic hydrogenation and the like, low equipment requirements, high safety, cheap and easily available raw materials, no need of expensive catalysts, high product purity, high yield and suitability for industrial production.

The invention belongs to the technical field of biological agriculture and in particular discloses a seed treatment method for improving cold resistance of cucumber. The method specifically comprisesthe following steps: (1) selecting cucumber seeds of full grains, soaking into a ferric oxalate solution, filtering and fishing up, and carrying out microwave drying treatment; (2) soaking a seed soaking agent, filtering and fishing up, and carrying out vacuum treatment, wherein the seed soaking agent is prepared from the following raw materials: fresh sweet potato leaves, fresh toona sinensis leaves, fresh pine needles, butyl formate, citric acid chelated copper, grifola frondosa and water; (3) carrying out electric field treatment, and drying. By adopting the seed treatment method, the coldresistance of cucumber plants can be effectively improved, synthesis and accumulation of soluble saccharides, soluble proteins and proline in cucumber plant leaves at a low temperature can be effectively promoted, activity of superoxide dismutase in cucumber plant leaves can be improved, relative transparency of a plasma membrane can be degraded, generation of malonaldehyde in leaf cells can be reduced, and optical damage and oxidation damage caused by low temperatures to the cucumber plants can be effectively avoided.

The invention provides a process synthesis method of 1,7-diazaspiro[3.5]nonane-7-tert-butyl formate. The synthesis method comprises the following five steps: 1, reacting a compound 1 with a bromine compound 2 and ammonium acetate by a one-pot method to obtain a compound 2; 2, reducing a compound 3 by using lithium borohydride to obtain a compound 4; 3, using triethylamine is used as alkali, and reacting the compound 4 with p-toluene sulfonyl chloride to generate a compound 5; 4, under the catalysis of potassium iodide, taking cesium carbonate as alkali, and carrying out ring closing on the compound 5 to generate a compound 6; and 5, under the action of magnesium chips, removing p-toluene sulfonyl from the compound 6 to obtain a compound 7. The method mainly solves the technical problem that no method suitable for industrial synthesis exists at present, and has the advantages that raw materials are easy to obtain, the total yield is high, and the method is suitable for industrial production.

The invention provides a banana essence. The banana essence comprises following raw materials: a banana extract, clove oil, lemon oil, sweet orange oil, ethyl acetate, butyl butyrate, isoamyl butyrate, butyl formate, myrcene, terpinene, vanillin, cis-3 hexenol, styralyl acetate, propylene glycol and ethanol. The banana essence is soft, mellow and thick in fragrance, stable in properties, and natural in flavor, is capable of providing consumers with the fragrance feel close to that of fresh bananas, is high in consumer approval degree, can be added into food and beverage as a food additive, andis capable of providing products with natural banana fragrance and mouthfeel, so that the produced products are welcomed by consumers.

The invention discloses a method for preparing a CDK4 / 6 inhibitor key intermediate through a chemical enzyme method. The method comprises the following steps: firstly, carrying out halogen / magnesium exchange on 5-bromo-2-nitropyridine and tert-butyl magnesium chloride to generate a Grignard reagent, and then carrying out addition reaction with N-tert-butyloxycarboryl-4-bromopiperidine to obtain 4-(6-nitropyridine-3-yl)piperidine-1-tert-butyl formate; and then creatively using nitroreductase (assisted by reductive coenzyme I) to reduce the 4-(6-nitropyridine-3-yl)piperidine-tert-butyl formate into 4-(6-aminopyridine-3-yl)piperidine-1-tert-butyl formate. The method has the advantages of short steps, simple operation, mild reaction conditions, high safety, no heavy metal catalyst, environmental protection, good product quality, high yield and low cost.

The invention discloses a preparation method of nifuratel, which comprises the following steps: taking epoxypropyl dimethyl sulfide as an initial raw material, carrying out a synthetic reaction with carbon dioxide to obtain methylthio methyl ethylene carbonate, then carrying out a synthetic reaction with tert-butyl carbazate to obtain N-(tert-butyl formate-amino)-5-methylthio methyl-2-oxazolidinone, and finally, carrying out a reaction on the N-(tert-butyl formate-amino)-5-methylthio methyl-2-oxazolidinone and the N-(tert-butyl formate-amino)-5-methylthio methyl-2-oxazolidinone to obtain the nifuratel. And carrying out condensation reaction with 5-nitrofurfural to obtain nifuratel. The nifuratel prepared by the method is relatively high in yield and purity, the preparation process is green and pollution-free, meanwhile, the problem of carbon dioxide waste gas pollution is solved, and the defects of environmental pollution, potential safety hazards, raw material waste and the like existing in an existing nifuratel synthesis process are overcome.

The invention discloses a storage battery electrolyte with high electrochemical performance, which is prepared from, by mass, 40-60 parts of hydrogen sulfate, 10-20 parts of stannous sulfate, 10-20 parts of phosphoric acid, 0.2-0.4 part of cobalt acetate, 1-2 parts of phosphonic acid, 0.5-1 part of EDTA disodium, and 0.5-1 part of 2-mercaptobenzimidazole allyl sulfide, 3-5 parts of methyl sulfonate, 3-5 parts of trifluoromethyl sulfate, 8-10 parts of ethyl acetate, 8-10 parts of butyl formate and 50-80 parts of deionized water. The storage battery prepared by the electrolyte can obviously improve the service efficiency of the storage battery, and can effectively prolong the service life of the storage battery and is simple and convenient to operate.

The invention discloses a synthesis method of 1-oxo-2,6-diazaspiro[3.5]nonane-6-tert-butyl formate. The synthesis method comprises the following steps: in a first reaction solvent and an inert atmosphere, reacting a compound 2 with a compound 1 under the action of alkali to obtain a compound 3; and 2, removing a benzyl protecting group from the compound 3 to obtain a compound 4. The disclosed method has the advantages of easily available raw materials, convenience in operation, short route, high total yield, suitability for industrial production and the like, and mainly solves the technical problem that no suitable industrial synthesis method exists at present.

The invention discloses a synthesis method of octahydro-4A,8-epoxy pyrido[4,3-C]azepine-6(5H)-tert-butyl formate. The synthesis method comprises the following steps: 1, reacting a compound 1 with a catalytic amount of osmium tetroxide and a first oxidant to obtain a compound 2; 2, oxidizing an alcoholic hydroxyl group into an aldehyde group by the compound 2 under the action of a second oxidant to obtain a compound 3; 3, subjecting the compound 3 and benzyl amine to reduction ammoniation in an inert atmosphere under the action of a first reducing agent to obtain a compound 4; 4, subjecting the compound 4 to catalytic hydrogenation through a palladium catalyst in the presence of Boc2O to obtain a compound 5; 5, reducing the compound 5 through a second reducing agent to obtain a compound 6; and 6, carrying out catalytic hydrogenation on the compound 6 under the action of a palladium catalyst to obtain a compound 7. The method disclosed by the invention has the advantages of easily available raw materials, convenience in operation, safety in reaction, suitability for amplification, short route, high total yield, suitability for industrial production and the like.

The invention discloses a preparation method of 4-(tert-butyl 1-piperazinecarboxylate-4-yl)aniline. The preparation method of the 4-(tert-butyl 1-piperazinecarboxylate-4-yl)aniline comprises the following steps that aniline, piperazine-1-tert-butyl formate and acridine salt photocatalysts are added into a solvent; illumination reaction is performed under the condition of oxidizing agent existence;the 4-(tert-butyl 1-piperazinecarboxylate-4-yl)aniline is generated. The preparation method of the 4-(tert-butyl 1-piperazinecarboxylate-4-yl)aniline has the advantages that the 4-(tert-butyl 1-piperazinecarboxylate-4-yl)aniline is synthesized in one step; on one hand, the synthesis path of the 4-(tert-butyl 1-piperazinecarboxylate-4-yl)aniline is effectively shortened; the generation of by-products is effectively reduced; the target product yield is improved; on the other hand, only photocatalysts and oxidizing agents are used, so that the preparation method is safe and achieves an environment-friendly effect; the cost is low.

The invention discloses a catalytic rectification process which takes heterogeneous solid base as a catalyst to catalyze methyl propionate and reaction raw material esters such as ethyl formate, propyl formate, butyl formate, ethyl acetate, n-propyl acetate, butyl acetate and the like to synthesize propionate with high added value and high purity in one step. The advantage of the process is that the boiling point of a general product methyl propionate is the lowest, and a reaction system is separated from the top of a reaction rectification tower to push the reaction forward, resulting in a more complete reaction of the reaction raw materials except the methyl propionate. The solid base catalyst is adopted, so that the catalytic efficiency is high, the stability is good, and the liquid phase product and the solid phase catalyst do not need to be separated. In addition, the raw material esters and the product esters generally have no azeotropy and are easy to separate, which is of greatsignificance for large-scale and low-cost production of propionic acid esters with high added value and high purity. The whole reaction process is green, energy-saving, environment-friendly and efficient.

The invention discloses a formula and a preparation method of an environment-friendly lithium battery electrolyte. The lithium battery electrolyte is prepared from the following raw materials in parts by weight: 15-20 parts of ethylene carbonate, 15-20 parts of propylene carbonate, 10-20 parts of butylene carbonate, 10-15 parts of methyl formate, 8-14 parts of ethyl formate, 8-14 parts of butyl formate, 15-20 parts of deionized water, 4-8 parts of lithium perchlorate, 5-10 parts of lithium oxalyldifluoroborate, 6-10 parts of lithium bis(oxalato)borate, 2-4 parts of phenylcyclohexane, 1-4 parts of hydrogenated terphenyl, 1-4 parts of vinylene carbonate, 2-6 parts of hydroxyethyl cellulose, 0.8-1.2 parts of poly-ethylenedioxythiophene and 1.2-1.6 parts of polyaniline. By taking multiple kinds of organic solvents as the main solvents of the electrolyte, the obtained battery can be green, environment friendly and harmless; and by virtue of the stability additives hydroxyethyl cellulose, poly-ethylenedioxythiophene, polyaniline and the like added to the electrolyte, the chemical component stability of the electrolyte can be improved, and the service life of the battery can be greatly prolonged.

The invention relates to 1,2,3,4-tetrahydroquinoline compound and a synthetic method and application thereof. In a structure formula of the compound, the R1 is nitro or trifluoromethyl or 3-nitrophenylnitrobenzene sulfonyl or cyano, the R2 is hydrogen or methyl, the R3 is methyl formate or butyl formate, and the R4 is methyl. An aromatic ring of the 1,2,3,4-tetrahydroquinoline compound contains a series of electron withdrawing groups. The synthetic method is simple, economical, environment-friendly, easy to operate, easy to control, higher in product purity and yield and good in development prospect in industrial production; in addition, the synthetic method is also a novel synthetic method in atom economy; furthermore, the 1,2,3,4-tetrahydroquinoline compound can serve as intermediate to be used for preparing antagonist medicine.

The invention discloses a preparation method of a Rayleigh bactam intermediate. (2S, 5R)-5-[(benzyloxy) amino] piperidine-2-formate II is used as a raw material and reacts with Boc-4-aminopiperidine III in the presence of an accelerant to generate 4-((2S, 5R)-((benzyloxy) amino) piperidine-2-formamide) piperidine-1-tert-butyl formate I. The method has the advantages of readily available raw materials, mild reaction conditions, high reaction selectivity, high reaction speed, few impurities and the like.

The invention relates to polyurethane paint, and specifically relates to the polyurethane paint and a preparation method thereof. The polyurethane paint is prepared from, by weight, the following rawmaterials: 10-30 parts of polyurethane, 30-50 parts of alkyd resin, 5-10 parts of butyl formate, 5-10 parts of acrylic resin, 10-20 parts of glycerol, 0.5-1 part of an antioxidant, 0.5-2 parts of a defoaming agent, 0.5-2 parts of a thickening agent, and 0.1-0.5 part of a levelling agent. The components of the paint are synergistic to overcome the problem that traditional polyurethane paint is blistered by wetting, is subjected to paint film efflorescence, and is poor in yellowing resistance performance; the prepared polyurethane paint has strong climate adaptability, is not blistered by wetting, is bright in paint film, is good in yellowing resistance performance, is hard and wear resistant, and is not easy to be subjected to efflorescence; and the preparation method is simple and easy toimplement.

The invention discloses a preparation method of 4-(6-aminopyridine-3-radical) piperidine-1-tert-butyl formate. The target product 4-(6-aminopyridine-3-radical) piperidine-1-tert-butyl formate is obtained by three steps of reactions by taking N-(5-bromine-piperidine-2-)-2, 2-dimethylacrylamide, N-t-butyloxycarboryl-4-piperidone, raney nickel and the like as raw materials. The preparation method issimple, convenient and stable in process operation, and a product in each step is easy to separate, high in yield and environmentally friendly; the comprehensive yield is 82 percent or above; comparedwith the yield of 42 percent of the existing process, the yield is obviously increased; furthermore, the raw materials are low in cost and readily available, so that the production costs of existingbiological, medical and chemical intermediates are substantially reduced; industrial large-scale production is facilitated.