63 results about "Acetoacetic acid" patented technology

Compositions for delivering ketone bodies to a subject include one or more beta-hydroxybutyrate salts, one or more acetoacetate salts, beta-hydroxybutyric acid, and optionally acetoacetic acid. The compositions may optionally include one or more ketone body esters, such as one or more beta-hydroxybutyrate esters and / or one or more acetoacetate esters. An example composition contains about 2% to about 98% on a molar basis of the one or more beta-hydroxybutyrate salts and the one or more acetoacetate salts, about 2% to about 98% on a molar basis of the beta-hydroxybutyrate free acid and optionally the acetoacetate free acid, and optionally about 2% to about 98% on a molar basis of one or more ketone body esters.

The invention discloses a preparation method of ethyl 4-chloroacetoacetate, and belongs to the technical field of compound synthesis. The method comprises the following steps: by taking diketene as a raw material, adding a polymethylsilsesquioxane polymerization inhibitor into a dichloromethane solvent, introducing chlorine at low temperature, carrying out chlorination reaction to generate 4-chloroacetoacetic acid, then esterifying the 4-chloroacetoacetic acid with absolute ethyl alcohol to obtain a crude product, and finally distilling and purifying to obtain the product. The preparation method is characterized in that a polymethylsilsesquioxane polymerization inhibitor is added before chlorination reaction, the polymerization inhibitor is prepared by grafting a functional monomer containing a 3, 5-di-tert-butyl-4-hydroxycinnamic acid structure onto surface-ethenylated polymethylsilsesquioxane microspheres, and the polymethylsilsesquioxane polymerization inhibitor has both steric hindrance and free radical capture capability. The method can effectively inhibit the self-polymerization and copolymerization tendency of diketene, intermediates and products in a reaction system, obviously reduces the generation of by-products such as dichloro and polychloro, enables the product to be high in yield and good in purity, and meets the quality requirements of high-end medical intermediates.

A resin composition contains a resin that includes a monomer unit derived from (A) an acetoacetic acid ester compound including two or more acetoacetic acid ester groups in a molecule and a monomer unit derived from (B) an amine compound including two or more primary amino groups in a molecule, and that has a three-dimensional crosslinked structure in which an acetoacetic acid ester group of the (A) acetoacetic acid ester compound and a primary amino group of the (B) amine compound are condensation bonded.

The invention provides a polyvinyl alcohol derivative as well as a preparation method and application thereof. The polyvinyl alcohol derivative comprises a structural unit of 1, 4-dihydropyridine, a structural unit of vinyl alcohol and a structural unit of vinyl acetate. The preparation method comprises the following steps: dissolving polyvinyl alcohol in an anhydrous organic solvent, adding an acetoacetic acid reagent for reaction to obtain a polyvinyl alcohol derivative containing beta-diketone, and in the presence of a catalyst, reacting an aldehyde compound containing an aggregation-induced emission structure, an ammonia source compound and 1, 2-diketone to obtain the beta-diketone-containing polyvinyl alcohol derivative. And adding a 1, 3-diketone compound into the obtained polyvinyl alcohol derivative containing beta-diketone, and carrying out Hantzsch reaction, so as to obtain the antioxidant aggregation-induced emission polyvinyl alcohol derivative containing the 1, 4-dihydropyridine structure. The polyvinyl alcohol derivative disclosed by the invention has excellent oxidation resistance and aggregation-induced emission performance, and can be applied to the fields of food packaging, biological medicine, health care and the like.

The application discloses a kind of flame-retardant mildew-proof prepolymer, transparent flame-retardant mildew-proof silicone sealant and preparation method thereof.The flame-retardant mildew-proof prepolymer is prepared from raw materials including the following components by weight: mildew-proof agent 0.5-10 parts, flame retardant 20-50 parts, tackifier composition 0.2-2 parts;The tackifier composition is composed of alkyl acetoacetate, trimethylsilyl ethyl acetate, 3-isocyanate propyl trimethoxysilane and polyether silicone oil.The transparent flame-retardant mildew-proof silicone sealant is prepared from raw materials including the following components: alkyl alkoxy-terminated polydimethylsiloxane, white carbon black, the flame-retardant mildew-proof prepolymer, crosslinking agent, catalyst, coupling agent.The transparent flame-retardant mildew-proof silicone sealant prepared by the application not only has very high transparency, but also has excellent flame-retardant effect, long-lasting mildew-resistant and antibacterial properties, and good bonding stability and mechanical strength.

The invention relates to a blocked polyurethane composition based on at least one diisocyanate and / or polyisocyanate, at least one polyol, at least one hydroxyl chain extender and at least one end-capping agent, the at least one end-capping agent being selected from malonates, acetoacetates and acetylacetonates, and the at least one polyol is selected from the group consisting of polyester polyols, polycarbonate glycols, and polycaprolactone glycols; a use of the composition; the invention discloses a preparation method of an artificial leather surface layer and the artificial leather surface layer.

This invention belongs to the field of photocurable materials, specifically relating to a UV-curable material with shape memory and self-healing functions and its manufacturing method. The process involves reacting starch, succinic anhydride, acetic anhydride, and methanesulfonic acid in glacial acetic acid to form acetate starch; reacting epoxidized soybean oil, methanol, and tetrafluoroboric acid to form soybean oil-based polyol; reacting this polyol with tert-butyl acetoacetate to form acetylated soybean oil; reacting this prepolymer with polytetrahydrofuran, diisocyanate, and isobornyl acrylate to form an acetylated soybean oil-based polyurethane photosensitive prepolymer; and finally reacting this prepolymer with acetate starch, a diluent, and a photoinitiator to form a UV-curable material with shape memory and self-healing functions. This invention features high reactivity, mild reaction conditions, high atom utilization, and the material exhibits excellent mechanical, thermal, shape memory, and self-healing properties. It is suitable for applications in adhesives, flexible electronic packaging, and advanced manufacturing.

The invention relates to the technical field of textile materials, and discloses antibacterial silk and a preparation method thereof.The antibacterial silk is prepared by dipping acetylation-modified degummed mulberry silk in composite antibacterial liquid and conducting thermocuring, and the composite antibacterial liquid comprises nano-silver colloid, a copper sulfate-chitosan complex, natural plant extract and a cross-linking agent; the composite antibacterial liquid takes a mixed solvent of ethanol and water as a carrier. Wherein the acetylation modification is realized by the following steps: immersing the degummed mulberry silk into a DMF (Dimethyl Formamide) solution containing 5-10wt% of acetic acid acetyl tert-butyl ester, reacting at 80-150 DEG C for 1-6 hours, and grafting an acetoacetic acid group. The nano-material, the metal complex and the natural antibacterial component are compositely loaded on the surface of the silk fiber in a chemical bonding and physical adsorption combined mode, efficient, broad-spectrum and durable antibacterial performance is achieved, and the silk fiber is suitable for the high-added-value fields of medical treatment, clothes and the like.

The application belongs to the field of polymer materials, and provides an environmentally-friendly polymer material with adjustable dynamic network and a preparation and closed-loop recycling method thereof, which comprises the following steps: carrying out a photopolymerization reaction of acetoacetic acid alkene and different functionality mercaptans in a solvent to obtain acetoacetic acid ester multimers with different functionality; carrying out a crosslinking reaction of the acetoacetic acid ester multimers and polyamine monomers in a solvent to obtain a prepolymer; curing the prepolymer to obtain a Vitrimer polymer film; and annealing, and the environmentally-friendly polymer material with adjustable dynamic network is obtained.The acetoacetic acid ester multimers with different branching conditions are prepared through ene click reaction, different network structures are given to the material, the network is adjusted, the dynamic and mechanical properties of the network are controlled, and the introduction of the vinyl amine ester bond into the polymer network provides a possibility for the closed-loop recycling upgrade of the polymer network.

As one aspect, the present disclosure provides a bacterium of the genus Corynebacterium capable of producing isopropanol with high productivity. As another aspect, the present disclosure provides a method which enables the production of isopropanol with high productivity while suppressing the production of by-products.　In one aspect, the present disclosure relates to a bacterium of the genus Corynebacterium capable of producing isopropanol, the bacterium being produced by introducing into a bacterium of the genus Corynebacterium a specific gene (A) that encodes an enzyme having an activity of producing acetoacetic acid from acetoacetyl-CoA and / or a specific gene (B) that encodes an enzyme having an activity of producing acetone from acetoacetic acid in a manner that enables expression thereof. In another aspect, the present disclosure relates to a method for producing isopropanol, the method comprising: allowing a genetically modified bacterium of the genus Corynebacterium capable of producing isopropanol to carry out a fermentation reaction in a fermentation tank to produce a fermentation product containing isopropanol; continuously or intermittently withdrawing a portion of a reaction solution containing the fermentation product from the fermentation tank during the fermentation reaction; separating isopropanol from the withdrawn reaction solution by pervaporation; and supplying to the fermentation tank the reaction solution from which isopropanol has been separated.

The invention belongs to the technical field of metal surface treatment, and discloses a high-permeability and low-corrosion die-casting aluminum degreasing agent as well as a preparation method and application thereof. The die-casting aluminum degreasing agent comprises an active matter and water, the active matters comprise 6 to 10 percent of organic weak acid, 0.5 to 1.5 percent of chitosan oligosaccharide, 0.5 to 1.2 percent of tea polyphenol, 0.7 to 1.8 percent of curcumin, 4 to 6 percent of surfactant, 0.4 to 1.0 percent of cyclodextrin, 0.5 to 0.8 percent of low-foaming additive, 1.0 to 2.0 percent of buffering agent, 0.6 to 1.5 percent of corrosion inhibitor and 0.2 to 0.5 percent of lipase by taking the total mass of the die-casting aluminum degreasing agent as 100 percent; the organic weak acid comprises levulinic acid, lactic acid and acetoacetic acid; the corrosion inhibitor comprises polycarboxylate and hydroxy carboxylate. The die-casting aluminum degreasing agent has excellent removal capacity for common silicone oil / ester release agents on the surface of a die-casting aluminum alloy, is low in corrosivity and does not contain phosphorus or fluorine or other components prone to polluting water.

The present application relates to the technical field of organic chemical intermediates purification, in particular to a method and device for cis-trans isomerization conversion of 4-halo-2-methoxy imino acetoacetic acid ethyl ester. After cooling, 4-halo-2-methoxy imino acetoacetic acid ethyl ester is mixed with sodium chloride brine to form crystal slurry; then the crystal slurry is discharged into a crystal conversion kettle for aging; after aging, the crystal slurry is heated, extracted and centrifuged, and the organic phase is collected to obtain 4-halo-2-methoxy imino acetoacetic acid ethyl ester. Through the continuous process of "low-temperature brine crystallization enrichment-crystal conversion aging directional conversion-microwave rapid heating to prevent reverse conversion-two-stage extraction centrifugation purification-brine circulation to reduce cost", the content of cis-4-halo-2-methoxy imino acetoacetic acid ethyl ester is stably increased to 92-95%, and the production cost and environmental risk are reduced.

The application discloses a preparation method of cinnamyl 3-amino-2-butenoate, and relates to the technical field of preparation of cinnamyl 3-amino-2-butenoate which is a intermediate of cinaldipine. In the method, cinnamyl acetoacetate is added into a mixed reaction solvent, liquid ammonia is continuously introduced for reaction at low temperature, after cinnamyl 3-amino-2-butenoate is generated, ammonia is removed by reduced pressure, and then the temperature is reduced for crystallization, filtration is performed, and the obtained product is washed by a solvent to obtain white cinnamyl 3-amino-2-butenoate solid. In the application, mixed solvents are used for reaction, and after the reaction is completed, the solvents are not removed by reduced pressure, the heat generated by ammonia removal by reduced pressure is used to reduce the temperature of the liquid, and crystallization is performed, so that energy consumption is saved, the whole process is performed at low temperature, decomposition of the product caused by high temperature is avoided, and cinnamyl 3-amino-2-butenoate with high purity can be prepared, and the intermediate with high purity is provided for preparation of cinaldipine.

The invention discloses water-based ink and a preparation method thereof. The invention relates to printing ink and a preparation method thereof, and belongs to the technical field of printing ink. According to the invention, acetoacetoxy ethyl methacrylate and styrene are added during preparation of polyacrylate, so that the leveling property and adhesive force of the finished product water-based ink are improved, and the wear resistance and hydrophobic property of the finished product oil ink are improved; the curing agent can be cross-linked with carbonyl in acetoacetoxy ethyl methacrylate at normal temperature, the curing speed of the water-based ink at low temperature is increased, the chemical resistance and weather resistance of the water-based ink are improved, the surface drying time of the water-based ink at low temperature (10 DEG C) can be lower than 25 s, and the water-based ink has good water-based ink surface drying performance. And the printing speed requirement of modern enterprises can be met.

The application discloses a skin-feeling acrylic finish emulsion and a preparation method and application thereof. The emulsion is prepared by emulsion polymerization of the following monomer components in a weight ratio: a) 15-70% of ester monomers, b) 1.3-10% of acetoacetoxy-containing olefinically unsaturated monomers, c) 0.5-5% of unsaturated hydrophilic monomers, d) 0.2-5% of reactive silane coupling agents, e) 10-50% of styrene, and f) 14-25% of (4-vinylphenyl)dimethylsilane. The acrylic finish emulsion provided by the application is applied to building interior wall coatings, has a smooth skin feeling, has good anti-graffiti performance, and has synergistically improved water resistance and scrub resistance.

The application discloses an anti-graffiti acrylic emulsion and a preparation method and application thereof. The emulsion is prepared by emulsion polymerization of the following monomer components in a weight ratio and then obtained by stripping: a) 15-70% of ester monomers; b) 1.3-10% of acetoacetoxy-containing olefinically unsaturated monomers; c) 0.5-5% of unsaturated hydrophilic monomers; d) 0.2-5% of reactive silane coupling agents; e) 10-50% of styrene; and f) 14-25% of TMS-protected alkynyl monomers. The total mass of components a), b), c), d), e) and f) is 100%. The TMS-protected alkynyl monomers are added in the emulsion, can be deprotected and further undergo alkynyl addition reaction in the high-temperature stripping process after reaction, so that the polymer chain segments are intertwined and connected, a compact cross-linked structure is formed, and the anti-graffiti capability of the paint is greatly improved.

The invention relates to the technical field of coatings, and discloses an antibacterial UV-cured copolyester children water cup coating which is prepared from hexa-functionality and bifunctionality aliphatic polyurethane acrylate, isobornyl acrylate, a photoinitiator, a flatting agent and a ternary coordination antibacterial pre-solution. The preparation method comprises the following steps: dispersing zinc dimethacrylate in acetoacetic acid ethyl methacrylate and ethyl acetate, and dropwise adding hydroxyethyl methylacrylate phosphate under a mild condition to react, so as to obtain the zinc-beta-diketone-phosphate ternary coordination system. An indissolvable zinc salt is converted into an organic compatible form by utilizing a synergistic effect of acidolysis and chelation, so that the haze problem caused by poor dispersion of a zinc source is solved; and meanwhile, the Lewis acid catalysis characteristic of the zinc complex is utilized to initiate Michael addition reaction to deeply consume residual monomers. On the basis of ensuring high light transmittance of the coating and excellent adhesive force to a copolyester base material, high-efficiency antibacterial and low-monomer-residue safety are realized.

The invention relates to the technical field of food processing, and discloses a passion fruit and black tea low-sugar beverage which comprises the following components in parts by weight: 25-35 parts of passion fruit pulp; 65-75 parts of black tea soup; the sweetening agent is prepared from the following components in parts by weight: 0.01 to 0.03 part of acetoacetic acid, 0.005 to 0.015 part of erythritol and 0.002 to 0.006 part of stevioside; the nanometer embedded particles are nanometer particles formed by cross-linking zein and chitosan according to the mass ratio of 3: 1, the particle size is 50-80 nm, and 0.1-0.3 part of volatile aroma components are embedded in the nanometer embedded particles; the endogenous stabilizer is prepared from 0.05 to 0.1 part of extracellular polysaccharide generated by lactobacillus acidophilus and 0.8 to 1.0 part of tea polyphenol. Through the synergistic interaction between natural sweet metabolites (such as acetoacetic acid) generated by microbial fermentation and sugar substitute molecules, on the premise that the sugar content is not increased, the sweetness intensity is multiplied, and through self-assembly of exopolysaccharides generated in situ in the fermentation process and tea polyphenol, a three-dimensional stable network is formed. Long-acting stability of suspended particles can be realized without depending on exogenous colloids such as pectin and carrageenan.

The present invention relates to a process for treating keratin fibers using a basic pH composition, one or more compounds with acetoacetate functions and one or more specific polyamine compounds.

The invention relates to the technical field of batteries, in particular to a positive electrode material, a secondary battery and a power utilization device. The positive pole piece comprises a positive current collector and a positive film layer arranged on at least one surface of the positive current collector; the positive electrode film layer comprises a positive electrode material, and the positive electrode material comprises a positive electrode active material and a coating material located on the surface of the positive electrode active material; the coating material comprises a cyano group-containing compound and a copolymer of acetoacetic acid ethylene glycol methacrylate. The positive pole piece in the secondary battery provided by the invention has high discharge capacity per gram, and the secondary battery has good cyclic storage performance.

The present invention relates to a process for coloring keratin fibers comprising: - at least one application step P on said keratin fibers of a composition comprising at least one protease-type enzyme, then - the application on said keratin fibers, in one or more steps, of the following ingredients, included in one or more separate compositions: i) at least one compound with particular acetoacetate functions, ii) at least one coloring agent selected from pigments, direct dyes, and mixtures thereof; and iii) at least one (poly)amine compound.

The invention provides a styrene-acrylic latex and a waterproof coating using the same, and the styrene-acrylic latex is prepared from the following raw materials in parts by mass: 530-600 parts of a soft monomer, 150-200 parts of a hard monomer, 15-25 parts of an amide monomer, 5-10 parts of a carboxylic acid monomer, 10-20 parts of a long carbon chain acrylate monomer and 1-5 parts of a crosslinking monomer; wherein the carbon atom number of the long-carbon-chain acrylate monomer is greater than or equal to 10; the cross-linking monomer comprises an inner cross-linking monomer or a normal-temperature self-cross-linking monomer; the internal crosslinking monomer comprises at least one of acetoacetoxy ethyl methacrylate, trimethylolpropane trimethacrylate and ethylene glycol dimethacrylate; the normal-temperature self-crosslinking monomer comprises at least one of adipic acid dihydrazide, diacetone acrylamide and ethylidene urea methacrylate.

The application discloses a kind of quick flocculants and preparation method and application thereof, it is related to wastewater treatment technical field.The quick flocculants prepared by the application is sequentially carried out alkali extraction, acid extraction, first modification, secondary modification with fly ash as raw material;The first modification is that the secondary filter residue obtained by acid extraction is mixed with acetoacetic acid solution to obtain the first modified secondary filter residue;The secondary modification is that the secondary filter residue of first modification, sodium silicate, the filtrate obtained by filtering of acid extraction and alkali extraction, mixed solution of ferric chloride, zinc chloride and polyacrylamide are mixed and reacted to obtain the quick flocculants;The wastewater treatment efficiency of the quick flocculants prepared by the application is higher, and the removal effect of heavy metals and colority in water is obvious.

The invention belongs to the technical field of conductive ink, and relates to pyrrole modified polyvinyl alcohol and polypyrrole grafted polyvinyl alcohol conductive ink as well as a preparation method and application thereof. The preparation method of the polypyrrole grafted polyvinyl alcohol conductive ink comprises the following steps: carrying out acetoacetic acid modification on polyvinyl alcohol to obtain acetoacetic acid polyvinyl alcohol, reacting the acetoacetic acid polyvinyl alcohol with an alpha-aminoketone compound to obtain pyrrole modified polyvinyl alcohol (PVAA-Py), adding water and pyrrole, uniformly mixing, adding ammonium persulfate, ferric trichloride and water, and uniformly mixing to obtain the polypyrrole grafted polyvinyl alcohol conductive ink. And uniformly stirring to obtain the polypyrrole grafted polyvinyl alcohol conductive ink. According to the polypyrrole grafted polyvinyl alcohol conductive ink prepared from the pyrrole modified polyvinyl alcohol, the dispersity, stability and conductivity of the conductive ink are improved, the conductive ink has uniform spreadability, and new conductive ink types and methods are provided for construction of paper-based or other base material conductive circuits.

This invention discloses an early water-resistant emulsion, comprising the following monomer components in the following weight ratios prepared by emulsion polymerization: a) 15-70%, preferably 44-66%, of ester monomers; b) 1.3-10%, preferably 2-4%, of olefinic unsaturated monomers containing acetoacetic acid groups; c) 0.5-5%, preferably 1-5%, of unsaturated monomers containing hydrophilic groups; d) 0.2-5%, preferably 0.5-2%, of reactive silane coupling agents; e) 10-50%, preferably 20-30%, of styrene; f) 14-25%, preferably 14-15%, of phosphorus-containing monomers. In exterior wall coating formulations, this emulsion provides strong early water resistance while also offering high stain resistance and high gloss.

The invention discloses acetoacetic acid esterified water-borne epoxy resin in the technical field of epoxy resin, and the acetoacetic acid esterified water-borne epoxy resin is prepared from the following raw materials in parts by weight: 3-8% of an emulsifier, 0-25% of an epoxy compound, 40-60% of acetoacetic acid esterified epoxy resin, 0-10% of a solvent and 30-50% of deionized water. The problems that an existing waterborne epoxy system is insufficient in chemical resistance, an epoxy-amine system is slowly cured in a low-temperature and high-humidity environment, and the construction efficiency is affected are solved, multifunctional resin with dual reaction activity is created, and waterborne epoxy resin with the environment-friendly advantage is obtained by emulsifying the multifunctional resin through an emulsifier of a special structure.

The invention discloses a compound for degrading 2, 4, 6-trinitrotoluene as well as a preparation method and application of the compound. The compound has 1-3 acylamino functional groups; the series of microbial conversion products of 2, 4, 6-trinitrotoluene provided by the invention are novel and diverse in structure, and the amino skeleton covers three different degrees of TNT reduction skeletons of nitro reduction, benzene ring reduction and cyclohexane reduction. And the carboxylic acid part comprises lactic acid, pyruvic acid, acetoacetic acid, beta-hydroxybutyric acid, myristic oleic acid and the like which are common in biological metabolic cycle and derivatives thereof, so that a structural basis is provided for resource reutilization of TNT microbial metabolites.

To provide polyalcohols with a high BHB unit or acetoacetate concentration per polyalcohol unit and preparation processes thereof.SOLUTION: There is provided a compound of formula 1, wherein A is derived from an organic polyol with at least 4 hydroxyl groups (A is referred to as the first organic polyol A), X is -C(H)(OH)- or -C(H)(OR1)-, R1 is selected from linear or branched C1-12 alkyl, C3-8 cycloalkyl, linear or branched C2-12 hydroxyalkyl, linear or branched C1-12 carboxyalkyl, and phenyl, and y is from 1 to the number of hydroxyl groups of the initial organic polyol A, and wherein the first organic polyol A is selected from linear or branched C2-12 alkyl substituted with at least four hydroxyl groups, or C3-8 cycloalkyl substituted with at least four hydroxyl groups.SELECTED DRAWING: None

Powder coating resins and coatings made using the powder coating resins are described. The powder coating resins are based on the use of C12 to C23 diacids. The C12 to C23 diacids are reacted with a reactant having an alcohol functionality and an amine functionality to form a carboxylic acid terminated polymer having ester and amide functionality. Alternatively, the C12 to C23 diacids are reacted with a reactant having an alcohol functionality and an amine functionality to form an intermediate polyol, which is then reacted with acetoacetic acid or an ester thereof to form an acetoacetate-terminated polymer.

The application discloses a preparation method of a phenylacetyl acetic acid compound, relates to the technical field of chemical synthesis, and the synthesis route of the phenylacetyl acetyl acid compound is as follows: an aniline compound connected with five groups of R1, R2, R3, R4 and R5 is used as a raw material, a diazotization reagent is added under acidic conditions to perform a diazotization reaction, a phase transfer catalyst, a copper catalyst and divinyl ketone are added to perform a reaction, and hydrolysis is performed under acidic conditions to obtain the phenylacetyl acetic acid compound; wherein R1, R2, R3, R4 and R5 are each independently selected from F, Cl, Br, -CH3, -OCH3, NO2, -C2H5, -C3H7, -CF3 or H, and are not H at the same time; when one or more of R1, R2, R3, R4 and R5 is F, the rest are not all H; and X is selected from Cl or Br. The raw material prepared by the application is easy to obtain, the operation is simple, the reaction condition is mild, the danger is low, the reaction step is short, the production cost and three waste emissions of enterprises are reduced, and large-scale industrial production can be easily realized.