410 results about "Butanone" patented technology

The invention discloses a colorful acid and alkali resistant laser printing ink and a preparation method thereof. The printing ink is composed of the following components in parts by weight: 0 to 30 parts of butanone, 10 to 30 parts of isopropanol, 2 to 6 parts of curing agent, 10 to 15 parts of pigment, and 10 to 30 parts of glycidyl ether epoxy resin. The glycidyl ether epoxy resin is adopted to produce the printing ink, aliphatic polyamine is further chosen as the curing agent, the acid and alkali resistant performance of the printing ink is strengthened through optimizing the formula, thus the shortage that the colorful laser printing ink is lost when being mixed with acid and alkali is overcome, moreover, the color of the laser printing product is more abundant, and the patterns are more clear.

The present invention provides a divinylbenzylfluorene and a preparation method and application thereof, a divinylbenzylfluorene hydrocarbon resin and a preparation method and application thereof, and relates to the technical field of high-frequency substrate materials. The divinylbenzylfluorene hydrocarbon resin prepared by using one or a mixture of any proportion of 9,9-bis(2-vinylbenzyl)-9H-fluorene and 9,9-bis(4-vinylbenzyl)-9H-fluorene provided by the present invention as raw materials has very low dielectric constant and dielectric loss tangent, and the higher the content of 9,9-bis(2-vinylbenzyl)-9H-fluorene, the smaller the dielectric loss tangent of the divinylbenzylfluorene hydrocarbon resin; moreover, the solubility of 9,9-bis(2-vinylbenzyl)-9H-fluorene and 9,9-bis(4-vinylbenzyl)-9H-fluorene provided by the present invention in toluene and 2-butanone is high, and has good application prospects as a cross-linking agent of the main resin or olefin resin component of a high-frequency substrate.

The invention discloses an insulating tape for a new energy battery and a preparation method of the insulating tape, and relates to the technical field of new energy battery assemblies. The insulating tape for the new energy battery is prepared by coating pretreated glass fiber cloth with a coating, the coating is prepared from the following raw materials in parts by weight: 15 to 20 parts of modified polyimide resin, 2 to 4 parts of epoxy resin E-51, 71 to 77 parts of an ethanol / butanone mixed solvent, 3 to 5 parts of modified nano silicon dioxide, 0.2 to 0.4 part of a silane coupling agent KH-550, 0.1 to 0.3 part of polydimethylsiloxane, 0.1 to 0.2 part of paraffin-based mineral oil and 0.3 to 0.5 part of triethylene tetramine. The glass fiber cloth pretreatment material comprises deionized water and a 5%-8% sodium hydroxide solution. The insulating adhesive tape for the new energy battery contains the modified polyimide resin, so that the high temperature resistance and electrolyte resistance of the adhesive tape can be enhanced, the insulativity is improved, and the modified nano silicon dioxide is good in dispersity. The preparation process is fine, the glass fiber cloth is fully pretreated, the preparation process is standard, and the use requirements of new energy batteries can be met.

The invention provides a high-hydrophobicity anti-pollution flashover coating and a preparation method thereof, and relates to the field of coatings. The silicone rubber composition is prepared from the following raw materials in parts by weight: 80 to 100 parts of hydroxyl-terminated polydimethylsiloxane; 5 to 15 parts of modified nano silicon dioxide; 10 to 30 parts of a composite self-repairing microcapsule; 10 to 25 parts of a flame retardant; 3-8 parts of a cross-linking agent; 0.5-2 parts of a catalyst; 1-5 parts of an accelerant; 40 to 100 parts of a solvent; the modified nano silicon dioxide is fumed silica subjected to surface treatment by a fluorine-containing silane coupling agent and a platinum catalyst; the capsule wall of the composite self-repairing microcapsule is a polylactic acid-glycolic acid copolymer, and the capsule core of the composite self-repairing microcapsule is a mixed solution of a hydroxyl-terminated polydimethylsiloxane oligomer and methyltris (methylethylketoximino) silane. The coating has excellent hydrophobicity, weather resistance and targeted repair function.

The invention discloses a preparation method of 6-methyl-5-octylene-2-ketone, and belongs to the technical field of organic synthesis. According to the method, 5-chloro-2-pentanone is taken as a starting raw material, carbonyl protection is carried out with trimethyl orthoformate under the catalysis of acid, then a Grignard reagent is prepared, condensation dehydration is carried out on the Grignard reagent and 2-butanone, deprotection is carried out under the acidic condition, and 6-methyl-5-octylene-2-ketone is prepared with high yield, the raw materials are easy to obtain and low in price, and the reaction can be catalyzed by using a conventional catalyst.

The invention discloses a polyurethane resin composition for display screen encapsulation, comprising the following raw materials in parts by weight: 20-25 parts of polyester resin, 10-15 parts of polyurethane resin, 45-50 parts of butanone, 6-10 parts of silane coupling agent KH560, 8-12 parts of flaky bentonite modified whisker agent, 5-10 parts of glass fiber regulator and 2-5 parts of nano lanthanum oxide agent. The polyurethane resin composition for display screen encapsulation of the invention uses polyester resin and polyurethane resin as base materials, and optimizes the interface of system raw materials by adding silane coupling agent KH560 as an interface regulator, and coordinates and synergizes the flaky bentonite modified whisker agent, glass fiber regulator and nano lanthanum oxide agent with each other, so that the bonding strength, water vapor barrier and cold and heat shock resistance of the product are coordinated and improved.

The invention provides a lithium ion diaphragm and a preparation method thereof and a preparation method of a lithium ion battery, the preparation method of the lithium ion diaphragm comprises the following steps: preparing oily positive electrode coating slurry with butanone as a solvent, and adding an aerogel additive into the oily positive electrode coating slurry; preparing water-based negative electrode coating slurry with ethanol as a solvent, wherein an aerogel additive is added into the water-based negative electrode coating slurry; and respectively coating the oily positive electrode coating slurry and the water-based negative electrode coating on two sides of a base membrane to obtain the lithium ion diaphragm with the oily positive electrode coating, the base membrane and the water-based negative electrode coating arranged in sequence. An aerogel additive is added into the oily positive electrode coating and the water-based negative electrode coating, so that the infiltration effect of the electrolyte is improved, and the high-temperature thermal shrinkage resistance is improved; the oily positive electrode coating slurry adopts an oily system, so that the bonding performance of an oily positive electrode coating and a positive plate is improved, and the aqueous negative electrode coating slurry adopts a hydrophilic system, so that the bonding performance of an aqueous negative electrode coating and a negative plate is improved.

The invention discloses an optical paste film and a preparation method thereof, and relates to the technical field of optical functional materials. The optical slurry film is prepared by taking a polyethylene glycol terephthalate film as a base material and coating an optical slurry coating, the optical slurry coating is prepared from the following raw materials in parts by weight: 12 to 16 parts of nano silicon dioxide, 22 to 28 parts of acetone and butanone mixed solvent, 7 to 9 parts of modified titanium dioxide, 4 to 6 parts of nano zirconium oxide, 30 to 35 parts of modified epoxy resin, 18 to 22 parts of butyl acrylate, 4 to 6 parts of dioctyl sebacate, 2.5 to 3.5 parts of silane coupling agent KH-570, 1 to 1.5 parts of organic silicon flatting agent and 0.6 to 1 part of organic silicon defoaming agent. 1.2-1.8 parts of an antioxidant 1010, 3-4 parts of a photoinitiator 184 and 6-8 parts of bis (4-tert-butylphenyl) iodine hexafluorophosphate; the polyethylene glycol terephthalate film pretreatment material comprises absolute ethyl alcohol and deionized water. The raw materials are scientifically proportioned, the titanium dioxide and the epoxy resin are clearly modified, the preparation process is complete, and the finished product is high in light transmittance, good in weather resistance, adaptive to the requirements of the optical field and high in practicability.

The invention relates to the technical field of bolts, and provides a bolt special for stainless steel mechanical equipment and a preparation method thereof. A bolt special for stainless steel mechanical equipment comprises a bolt body and a surface coating, and the surface coating is prepared from, by weight, 100 parts of epoxy resin E-44, 50-55 parts of a curing agent, 1.5-2 parts of a curing accelerator, 20-25 parts of flaky iron oxide, 10-12 parts of modified boron nitride, 2-3 parts of an ultraviolet light absorber, 3-5 parts of silicon dioxide, 1-1.5 parts of a dispersing agent, 25-35 parts of butanone and 10-12 parts of xylene. According to the bolt special for the stainless steel mechanical equipment, the corrosion resistance of the stainless steel bolt in a high-concentration acid-base solution and high-temperature and high-pressure seawater is improved.

The invention discloses a polyurethane sealant primer as well as a preparation method and application thereof, and relates to a primer as well as a preparation method and application thereof. The invention aims to solve the problems that the existing single-component polyurethane sealant has low bonding strength on aviation organic glass and cannot meet the bonding sealing of helicopter cabin organic glass and crack arrest of cabin cover organic glass. The primer is prepared from a T100 prepolymer, an MDI and TPTI mixed isocyanate prepolymer, 4-toluenesulfonyl isocyanate, a catalyst, butanone, carbon black and methanesulfonic acid. The method comprises the following steps: 1, preparing a mixed isocyanate prepolymer of MDI and TPTI; and 2, preparing the polyurethane sealant primer. According to the application, the adhesive is applied to bonding sealing of helicopter cabin organic glass and crack arrest of cabin cover organic glass. The invention provides the polyurethane sealant primer as well as the preparation and the application thereof.

The invention relates to a preparation method of a waterborne polyurethane anticorrosive coating, which comprises the following steps: carrying out drying treatment on poly (1, 4-butylene adipate) glycol; the preparation method comprises the following steps: putting polyadipic acid-1, 4-butanediol ester glycol and 2, 2-dimethylolpropionic acid into a reaction container, adding a butanone solution of isophorone diisocyanate and a catalyst, and heating and reacting in an oil bath for 3-5 hours in a nitrogen atmosphere to obtain a prepolymer A; adding the prepolymer B and 4, 4 '-dithiodiphenylamine into a reaction container, adding m-phthaloyl hydrazine, and carrying out reduced pressure distillation on a solvent in a reaction system; adding a certain amount of triethylamine into the reaction container and stirring; and adding a predetermined amount of distilled water, and stirring to obtain the waterborne polyurethane anticorrosive paint. The waterborne polyurethane anticorrosive paint prepared by the invention not only has excellent corrosion resistance, but also can warn the tiny damage of a coating and the local corrosion process of metal at the same time, so that effective protection of a metal material is realized, and the service life of the metal material is remarkably prolonged.

The invention discloses a synthetic method of methyl ethyl ketazine, which comprises the following steps: taking a cyano covalent organic framework material as a solid catalyst, taking butanone and ammonia water as raw materials, taking a hydrogen peroxide solution as an oxidizing agent, adding a certain amount of dimethyl sulfoxide (DMSO) and inorganic base, and reacting at a certain temperature to synthesize the methyl ethyl ketazine. According to the method, the catalyst is easy to separate, recover and recycle, and the yield of methyl ethyl ketazine is high.

An antifungal composition including a first essential oil, and a second essential oil, where the composition is configured to reduce disease onset, pathogen spread, or a combination thereof. Further, an antifungal compound including one or more aroma compounds selected from 4-(4-hydroxyphenyl)-2-butanone, furaneol, ethyl methylphenylglycidate, ethyl hexanoate, ethyl butanoate, beta-ionone, alpha-ionone, (R)-(+)-limonene, (S)-(-)-limonene, cis-3-Hexen-1-ol, nerol, linalool, 2-heptanone, alpha-terpineol, beta-damascenone, β-caryophyllene, ethyl 2-methylbutanoate, β-myrcene, gamma-octalactone, alpha-humulene, nerolidol, (E,E)-2,4-decadienal, (E,E)-α-farnesene, vanillin, phenylethyl acetate, citral, 3-methylbutan-1-ol, or a combination thereof.

A polyhydric alcohol amine absorbent suitable for a CO2 capture process from a flue gas with a low CO2 partial pressure, which takes continuous operation stability and safety into account. The polyhydric alcohol amine absorbent comprises the following main components: a main absorbent, an auxiliary absorbent, an antioxidant, a corrosion inhibitor and water, and the concentration of the absorbent is 22-58% by mass fraction, wherein the main absorbent comprises one or two of diethylenetriamine, N,N-diethylethanolamine and hydroxyethyl ethylenediamine; the auxiliary absorbent comprises one or two of monoethanolamine, 2-amino-2-methyl-1,3-propanediol, 2-amino-2-ethyl-1,3-propanediol and 2-amino-2-methyl-1-propanol; the antioxidant comprises one or two of butanone oxime, acetoxime, hydrazine carbonate and ammonium sulfite; the corrosion inhibitor is sodium vanadate; and the balance is desalinated water.

The present invention relates to a water-based two-component epoxy primer for rail transit coating and a preparation method thereof, wherein the epoxy primer is composed of component A and component B, wherein component A includes a water-based epoxy resin dispersion, a cosolvent, a dispersant, a wetting agent, ultrafine barium sulfate, titanium dioxide, ultrafine talcum powder, an anti-rust pigment, a defoamer, a rheological agent, carbon black, an anti-sagging agent and deionized water; and component B includes ethylene glycol monobutyl ether, a modified amine curing agent, an anti-flash rust agent and deionized water. The epoxy primer of the present invention has excellent adhesion to aluminum, the composite layer paint film has good adhesion, good anti-sagging performance, a wet film spraying can be μm ≥ 135 μm, the corresponding dry film thickness ≥ 55 μm, can adapt to electrostatic spraying, and has high construction efficiency. At the same time, the salt spray resistance (steel plate) of the primer reaches 720h and above, the butanone wiping resistance is excellent, and it has good anti-rust and corrosion resistance, and can be widely used in large rail transit vehicles.

The invention relates to a method for efficiently preparing hydroxylamine hydrochloride. The method comprises the following steps: mixing a diacetylmonoxime solution and a hydrochloric acid solution, pretreating through a pressurized nano-bubble fluidized bed, and carrying out reaction distillation under heating and pressurizing; after the reaction is finished, cooling reaction liquid, performing primary filtration and suction filtration through cross-flow filtration equipment, and collecting hydroxylamine hydrochloride crystals; and washing the crystal with absolute ethyl alcohol, recovering ethyl alcohol through cross-flow filtration equipment, and finally freeze-drying to obtain the high-purity hydroxylamine hydrochloride. The preparation method comprises the following steps: stirring quinoline-8-yl acrylate, tributyltin acrylate, 4-vinyl benzocyclobutene, ethanol and benzoyl peroxide to obtain a mixed solution; immersing the PTFE membrane subjected to low-temperature plasma pretreatment into the mixed solution, and then carrying out ultrasonic cleaning and vacuum drying to obtain a polymer modified PTFE membrane; the hydroxylamine hydrochloride prepared by the method disclosed by the invention has relatively high purity and yield, and meanwhile, the content of heavy metal ions and the content of water are effectively reduced.

The invention relates to the technical field of adhesives, in particular to a temperature-resistant adhesive for reinforcing and repairing a steel pipeline and a preparation method and application thereof.The adhesive comprises epoxy resin liquid, and the epoxy resin liquid is prepared from, by weight, 1 part of bisphenol A epoxy resin, 0.2-0.3 part of novolac epoxy resin and 0.1-0.15 part of polyethersulfone; specifically, the adhesive comprises a component A and a component B, and the weight ratio of the component A to the component B is 1: (0.15-0.25); the component A is prepared from 1 part of bisphenol A epoxy resin, 0.2 to 0.3 part of novolac epoxy resin, 0.1 to 0.15 part of polyethersulfone, 0.2 to 0.4 part of reactive diluent, 0.2 to 0.3 part of superfine aluminum powder, 1.6 to 2.0 parts of pigment and filler, 0.010 to 0.014 part of defoaming agent and 0.004 to 0.006 part of dispersing agent; the component B is prepared from 1 part of aromatic amine curing agent, 0.02-0.03 part of triethanolamine and 0.3-0.5 part of 2-butanone, the heat resistance, the mechanical property and the anti-corrosion property are excellent, the reinforcing and repairing requirements of steel pipelines in the high-temperature environment of 150 DEG C can be met, and the good long-term application effect is achieved.

The invention belongs to the technical field of high polymer materials and coatings, and relates to waterborne polyurethane, an emulsion containing the waterborne polyurethane as well as a preparation method and application of the emulsion. The preparation method of the emulsion containing the waterborne polyurethane comprises the following steps: dehydrating the polytetrahydrofuran ether glycol in vacuum; then adding isophorone diisocyanate, dibutyltin dilaurate and butanone, and carrying out a heat preservation reaction to obtain a prepolymer; then adding 1, 4-butanediol, 3-dimethylamino-1, 2-propylene glycol, a defoaming agent, a dispersing agent and a flatting agent, and carrying out further heat preservation reaction; adding syringic acid and acetic acid for reaction; adding water to emulsify to obtain a waterborne polyurethane emulsion; according to the application, the emulsion is used for preparing the polyurethane moisture-permeable microporous membrane. The prepared polyurethane moisture-permeable microporous membrane has good water resistance, moisture permeability, antibacterial and antifouling properties and strength, and can meet the application requirements of multiple fields.

The invention relates to the technical field of high polymer materials, and particularly discloses a flame-retardant heat-conducting silica gel insulating coating and a preparation method thereof. The invention discloses a flame-retardant heat-conducting silica gel insulating coating. Comprising the following components: polydimethylsiloxane, aluminum hydroxide, modified nano aluminum oxide, a phosphorus-nitrogen flame retardant, silicon dioxide, methyltris (methylethylketoxime) silane, vinyltris (methylethylketoxime) silane, dibutyltin dilaurate, a diluent, amino propyl triethoxy silane, propyl trimethoxy silane and ethyl aminopropyl trimethoxy silane. And the polydimethylsiloxane is formed by compounding polydimethylsiloxane with the viscosity of 1,500 cp and polydimethylsiloxane with the viscosity of 20,000 cp. According to the invention, by finely blending the proportion of various functional components, especially the optimal combination of polydimethylsiloxane, modified nano aluminum oxide, the flame retardant and the filler, the flame retardance and thermal conductivity of the coating are effectively improved, and meanwhile, good insulativity and mechanical properties are ensured.

The invention relates to a self-crosslinking high-temperature-resistant chloroprene rubber adhesive as well as a preparation method and application thereof. The invention relates to a self-crosslinking high-temperature-resistant chloroprene rubber adhesive. Comprising 2 to 4 parts by weight of methacrylic acid, 10 to 13 parts by weight of methyl methacrylate, 30 to 35 parts by weight of butanone, 0.4 to 0.6 part by weight of active magnesium oxide, 3 to 6 parts by weight of tert-butyl phenolic resin, 8 to 12 parts by weight of sec-butyl acetate, 12 to 15 parts by weight of chloroprene rubber, 0.1 to 0.2 part by weight of benzoyl peroxide and 24 to 28 parts by weight of toluene. The chloroprene rubber adhesive with the heat-resistant temperature of 100 DEG C or above is formed. The resin may improve characteristic adhesion and self-adhesion while increasing heat resistant cohesive strength.

The preparation method comprises the following steps: S1, hydrophilic-hydrophobic bi-component modification reaction: dissolving a styrene-maleic anhydride copolymer, hydrophilic polyethylene glycol monomethyl ether and hydrophobic long-chain alkyl alcohol in butanone according to a ratio, adding a catalyst, stirring, reacting, filtering, washing, and drying to obtain the dispersing agent for the lithium battery diaphragm based on the modified benzyl resin micelle. Performing ester exchange reaction on anhydride bonds of the styrene-maleic anhydride copolymer and polyether hydroxyl and alkyl alcohol hydroxyl respectively to obtain a modified intermediate; s2, neutralization reaction: dropwise adding organic alkali into the modified intermediate, and adjusting the pH value to obtain a modified SMA solution containing carboxylate groups; s3, preparing nano-micelles: dropwise adding the modified SMA solution into deionized water, and stirring to enable the modified SMA solution to be self-assembled to form the nano-micelles, so as to obtain nano-micelle dispersion liquid; and S4, dispersing agent forming: stirring the nano-micelle dispersion liquid to remove butanone so as to obtain the water-based dispersing agent.

The invention relates to a method for preparing anhydrous acetaldoxime by a system for co-producing diacetylmonoxime and acetaldoxime, and relates to the technical field of acetaldoxime. The method comprises the following steps: adding diacetylmonoxime, acetaldehyde and a modified TS-1 molecular sieve into a reactor, and reacting to generate crude acetaldehyde oxime; feeding the crude acetaldehyde oxime into an acetaldehyde removal tower for rectification separation; rectifying and separating acetaldehyde tower bottoms to obtain butanone; adding an extracting agent into the tower top acetaldoxime solution, and feeding into a distillation kettle for extraction; the extracted acetaldehyde oxime is fed into an acetaldehyde oxime finished product tower to be further rectified and purified; the preparation method comprises the following steps: reacting a TS-1 molecular sieve, anhydrous toluene and 3-mercaptopropyltrimethoxysilane to obtain a sulfhydrylated TS-1 molecular sieve; the preparation method comprises the following steps: taking a sulfhydrylated TS-1 molecular sieve, tetrahydrofuran, diethyl vinylphosphonate, mercaptododeborane disodium salt and Darocur1173 as photoinitiators, and reacting under the irradiation of 365nm ultraviolet light to obtain the modified TS-1 molecular sieve. The acetaldehyde oxime prepared by the method has higher content and yield.

The present invention relates to the technical field of the preparation of methyl ethyl ketone peroxide, and particularly relates to a preparation method of methyl ethyl ketone peroxide with low water content, which comprises the following steps: (1) adding hydrogen peroxide into a reaction kettle, adding a catalyst and stirring evenly, and then slowly dropping methyl ethyl ketone into the reaction kettle under stirring, and carrying out a reaction after the dropping is completed; (2) after the reaction is completed, adding a water separator into the reaction mixture, standing for stratification, and taking the upper-layer liquid; (3) freezing the upper-layer liquid, filtering the frozen liquid, and adding dimethyl phthalate into the filtrate for dilution to obtain the product. In the preparation method of methyl ethyl ketone peroxide with low water content of the present invention, by adding a freezing treatment process, the synthesized methyl ethyl ketone peroxide is frozen at -30 to -50 °C, greatly reducing the water content of methyl ethyl ketone peroxide. The water content of the prepared methyl ethyl ketone peroxide product is 4-5%, and the active oxygen content is 8-9%. The reaction performance and curing performance are good, and it has high production application value.

This invention discloses a production process for sulfur dioxide-resistant electroplated aluminum and the resulting electroplated aluminum, relating to the field of electroplated aluminum. The production process for sulfur dioxide-resistant electroplated aluminum includes: coating a release coating onto a base film layer to obtain a release layer; coating an imaging coating onto the release layer to obtain a color layer; molding and aluminum plating the color layer to obtain an aluminum-plated layer; and coating the aluminum-plated layer with an adhesive to obtain electroplated aluminum. The imaging coating comprises the following raw materials in parts by weight: 80-100 parts of modified monomeric acrylic polymer, 7-10 parts of isocyanate curing agent, 3-6 parts of highly branched semi-crosslinked polyurethane prepolymer, 0.8-1.5 parts of dispersant, 0.2-0.5 parts of defoamer, 35-50 parts of methyl ethyl ketone (MEK), and 35-50 parts of pentamidine ketone (PHK). The highly branched semi-crosslinked polyurethane prepolymer has a molecular weight of 110,000-120,000 and a softening point temperature of 220-240°C. This application provides electroplated aluminum resistant to sulfur dioxide corrosion.

The application belongs to the technical field of medicine synthesis, and particularly relates to a preparation method of methoxychlorpromazine monohydrochloride monohydrate. The method comprises the following steps: step 1, methoxychlorpromazine base is dissolved in a polar solvent, and hydrochloric acid is added to obtain a mixed solution; step 2, a poor solvent of methoxychlorpromazine monohydrochloride monohydrate is added to the mixed solution, crystallization is carried out, and separation is performed, and methoxychlorpromazine monohydrochloride monohydrate is obtained; the poor solvent is selected from one or a mixture of two or more of isopropyl alcohol, n-butyl alcohol, acetone, butanone, ethyl acetate, butyl acetate, dichloromethane, trichloromethane, toluene, methyl tert-butyl ether, isopropyl ether and diethyl ether. The method has the advantages of simple process, good repeatability, easy operation, high yield, product purity of more than 99.8%, complete compliance with the requirements of European Pharmacopoeia 9.0 and US Pharmacopoeia USP43, and suitability for industrial production.

The invention provides yellow glue resistant to corrosion of a plasticizer and a preparation method of the yellow glue. The yellow glue is prepared from a polyurethane prepolymer, a chloroprene rubber sheet, methyl methacrylate, benzoyl peroxide, an anti-aging agent, butanone, cyclohexane, dimethyl carbonate and tackifying resin. The polyurethane prepolymer is prepared from the following components in parts by weight: 10 to 14 parts of 1, 4-butanediol adipic acid polyester polyol, 4 to 8 parts of polycaprolactone polyol, 1 to 3 parts of diphenylmethane diisocyanate, 0.05 to 0.15 part of 1, 6-hexanediol, 1 to 2 parts of hydroxyethyl methacrylate, 0.01 to 0.03 part of organic bismuth catalyst and 75 to 80 parts of butanone. The polyurethane prepolymer with specific crystallization performance is synthesized through cooperation of polycaprolactone polyol and polyester polyol, and the yellow glue is endowed with excellent plasticizer corrosion resistance and low-temperature activation capacity. Active groups in the polyurethane prepolymer are subjected to graft copolymerization with the chloroprene rubber adhesive and MMA, and a plasticizer-resistant polyurethane chain segment is introduced into a molecular chain of the chloroprene rubber adhesive, so that a hard segment-soft segment alternating block structure is formed, and corrosion resistance and viscoelasticity are both considered.

The application discloses a kind of efficient natamycin purification methods, comprising the following steps: taking two kinds of dichloromethane, chloroform, acetone, butanone, methanol, ethanol, petroleum ether, n-hexane are mixed to obtain mixed solution, adjust the pH of mixed solution to 6.0-7.0, then natamycin crude product is added to mixed solution and stirred into slurry;Slurry is extracted to obtain that natamycin wet product, and the natamycin wet product after extraction is washed with organic solvent;Natamycin wet product after washing is dried, and natamycin purification product is obtained.Compared with prior art, the present application optimizes the existing natamycin purification process, simplifies the natamycin purification method, reduces the production cost, improves the production efficiency, the product purity can reach more than 98%, and the product yield can reach more than 95%.The application has the advantages of less equipment investment, easy operation, less environmental pollution, simple operation, and is suitable for product industrial production.

The invention belongs to the technical field of preparation of febuxostat intermediates, and particularly relates to a preparation method of a febuxostat intermediate. The preparation method comprises the following steps: taking thiourea and ethyl 2-butanone acid ester as raw materials, and carrying out nucleophilic addition-cyclization reaction to prepare 2-amino-4-methylthiazole-5-carboxylic acid ethyl ester; then, the 2-amino-4-methyl thiazole-5-carboxylic acid ethyl ester is subjected to a diazotization reaction, and 4-methyl-5-ethoxy carbonyl thiazole-2-diazonium chloride is obtained; the method comprises the following steps: taking 5-bromosalicylaldehyde and 4-methyl-5-ethoxycarbonyl thiazole-2-diazonium chloride as raw materials, and carrying out coupling reaction under the catalytic action to prepare the febuxostat intermediate. The synthetic route provided by the invention is efficient, economical and environment-friendly, is suitable for industrial production, can meet the market demand, and overcomes the technical defects existing in the preparation of the febuxostat intermediate in the prior art.

The invention belongs to the field of organic synthesis, and discloses a polysubstituted cyclobutanone compound and a preparation method thereof. Comprising the following steps: (1) dissolving a diketone compound, trialkyl phosphite, olefin, a photocatalyst and a reaction solvent in a reaction vessel; carrying out degassing protection by using argon (Ar) or nitrogen; (2) irradiating the reaction solution by using a proper light source, and stirring until the reaction is complete; and (3) after the reaction is completed, recovering the solvent under reduced pressure, and purifying through column chromatography or preparative thin-layer chromatography to obtain the cyclobutanone compound. According to the preparation method of the substituted cyclobutanone compound, the diketone compound is used as the raw material, the synthesis method of the ketene intermediate and the application range of cycloaddition reaction are expanded, and convenience is provided for preparation of various substituted cyclobutanone compounds.