304 results about "Ethylic acid" patented technology

The application discloses a preparation method of a low-TCR low-cost ceramic heating tube, and comprises the following steps: (1) preparing an organic carrier: 60 parts by weight of terpineol, 20 parts by weight of ethyl cellulose, 10 parts by weight of a binder and 10 parts by weight of diethylene glycol acetate are placed into a magnetic stirrer and uniformly dissolved and mixed; (2) weighing metal powder: Mo: 50-70 parts by weight; Re: 20-30 parts by weight; Mn: 0-5 parts by weight; Cr: 10-15 parts by weight; by adopting Mo, Re, Mn and Cr in a specific ratio as the metal powder, the traditional mode of adopting metal ruthenium powder or a mixture of metal ruthenium powder and other common metal powder is replaced, the prices of Mo, Re, Mn and Cr are low, so that the preparation cost of the ceramic heating tube is effectively reduced, the purpose of low TCR is achieved, and the scale production is facilitated; meanwhile, the ceramic heating tube prepared by adopting the application has higher overall bending strength, and can better meet the use requirement.

The present invention provides a solid dispersion of compound 1 or a pharmaceutical salt thereof, comprising the compound 1 or the pharmaceutical salt thereof as an active ingredient and a carrier material, wherein the carrier material is selected from one, two, or more of polyvinylpyrrolidone (PVP), copovidone, polyvinylpyrrolidone-vinyl acetate copolymer, hydroxypropyl methylcellulose acetate succinate, polyvinyl caprolactam-polyvinyl acetate-polyethylene glycol graft copolymer, hydroxypropyl methylcellulose, polyethylene glycol, and ethyl cellulose, enabling the drug to have good stability, dissolution, and therapeutic effects. The formulation of the present invention provides rapid drug release and can reduce the oral burden of large-dose tablets on menopausal patients, thereby improving treatment compliance and treatment efficiency.

The present application relates to the technical field of reverse water gas shift reaction, and discloses a preparation method of a catalyst for reverse water gas shift reaction, comprising the following steps: weighing magnesium nitrate and zinc acetate, so that the molar ratio of Mg atoms to Zn atoms is 1:1 to 1:10 or 3:1 to 10:1; dissolving the weighed magnesium nitrate and zinc acetate in water, adding urea, stirring and uniformly mixing at room temperature, and then increasing the temperature and stirring to promote the co-precipitation of metal ions; and obtaining the MgO-ZnO composite oxide catalyst by centrifugation, washing, drying and calcination of the obtained precipitate. The MgO-ZnO composite oxide catalyst is prepared by adopting the urea uniform precipitation method, using magnesium nitrate and zinc acetate as raw materials, and precisely controlling the molar ratio of Mg to Zn.

This invention discloses a method for preparing a chitosan antibacterial film. First, berberine aqueous solution and tannic acid aqueous solution are prepared separately. Then, the berberine aqueous solution is added dropwise to the tannic acid aqueous solution to form a mixed solution. The mixed solution is stirred and heated to obtain a suspension. The suspension is freeze-dried to obtain berberine-tannic acid nanoparticles. Next, a chitosan acetic acid aqueous solution is mixed with the berberine-tannic acid nanoparticles, and a film is formed to obtain a chitosan antibacterial film loaded with berberine-tannic acid nanoparticles. The prepared chitosan antibacterial film has low water content and swelling degree, strong ultraviolet shielding ability, high transparency, and strong inhibitory activity against Staphylococcus aureus and Salmonella typhimurium, which can better meet the needs of food preservation.

This invention relates to a compound fragrance essential oil, belonging to the field of fragrance technology, and solves the technical problems of existing fragrance essential oils, such as single aroma layers, poor fragrance retention, and easy component separation. This fragrance essential oil, by weight percentage, consists of 0.05wt%~0.10wt% polyethylene glycol, 9.00wt%~10.00wt% linalool, 0.50wt%~1.00wt% violet essential oil, and the balance being glyceryl acetate. The components are scientifically proportioned and compounded to produce a synergistic effect. Polyethylene glycol emulsifies and solubilizes, ensuring uniform mixing without separation. The sweet camphor floral scent of linalool blends harmoniously with the rich floral scent of violet essential oil. Glyceryl acetate acts as a carrier to enhance the fragrance retention stability of the essential oil. The final fragrance essential oil has a fresh, natural, rich, and long-lasting aroma. The formulation of this invention has been verified by professional testing institutions, confirming the authenticity and effectiveness of the components, the reasonable proportioning design, and the readily available raw materials. It can be directly compounded and used, applicable to multiple fields such as daily chemicals, food, and aromatherapy, with broad application prospects.

The application discloses a preparation method of a phenylacetic acid compound, and particularly, the application uses a substituted or unsubstituted aromatic hydrocarbon as a starting material, and under the action of a palladium catalyst (such as palladium acetate, palladium on carbon, palladium chloride, tetra-triphenyl palladium, etc.), the starting material is reacted with formaldehyde, HCl (aq) and CO to efficiently generate the phenylacetic acid compound. The method disclosed by the application only needs to start from the aromatic hydrocarbon, greatly reduces the difficulty and cost of obtaining the raw material, and avoids stimulating, sensitizing or toxic raw materials. Compared with the prior art, the method disclosed by the application has the advantages of simplicity and efficiency, cheap and easy-to-obtain raw materials, high atomic economy, high yield, green and pollution-free, easy industrialization and the like.

This invention discloses a bioactive glass and its preparation method, belonging to the field of bioactive glass technology. It aims to solve the problems of insufficient synergistic effect between antibacterial efficacy and bone-promoting activity in existing materials, as well as the inability to monitor in vivo degradation processes in real time. The bioactive glass comprises 44-48 parts silica; 22-27 parts calcium oxide; 22-27 parts sodium oxide; 5-7 parts phosphorus pentoxide; 2-4 parts europium zinc complex; 10-20 parts chitosan; 1-5 parts lidocaine; and 2-5 parts dilute acetic acid solution. The addition of the europium zinc complex promotes bone formation and enhances antibacterial activity, achieving a highly efficient synergy between anti-infection and tissue regeneration. Simultaneously, it provides optical tracking capabilities, allowing for non-destructive real-time monitoring of the material's degradation behavior and tissue integration in vivo via fluorescence imaging. This invention offers superior material performance and a simple preparation process, providing an innovative solution for the repair of infected bone defects.

This invention relates to the field of down fabric technology, specifically to a mite-proof and antibacterial composite down and its preparation method. The mite-proof and antibacterial composite down includes two outer fabric layers, two inner down-proof fabric layers, two nanocellulose / chitosan composite layers, and down filling. The nanocellulose / chitosan composite layers are prepared from the following components: aqueous polyurethane emulsion, nanocellulose, chitosan, chitosan-modified wood vinegar powder, natural genipin, and a dispersant. Chitosan is added in the form of an acetate-sodium acetate buffer solution with a pH of 4.0–4.8. This invention, through the synergistic effect of chitosan-modified wood vinegar powder and nanocellulose, combined with an aqueous polyurethane matrix, can simultaneously achieve high repellency, high antibacterial rate, and excellent wash resistance. Furthermore, the nanocellulose enhances the interfacial bonding strength of the nanocellulose / chitosan composite layer, significantly improving interlayer adhesion strength and down-proof performance.

This invention belongs to the field of organic synthesis and discloses a method for preparing α-difluoroselenomethyl ketone derivatives using electrochemistry. The method involves preparing α-difluoroselenomethyl ketone derivatives under electrochemical conditions using 2,2-difluorovinyl alcohol trimethylsilyl ether compounds and dialkyl diselenoether. Specifically, the 2,2-difluorovinyl alcohol trimethylsilyl ether compound and the dialkyl diselenoether compound are dissolved in an organic solvent, mixed thoroughly, an electrolyte is added, an inert electrode is inserted, and the reaction is carried out under electrostatic stirring at room temperature to obtain the product α-difluoro(selenomethyl) ketone derivative. This invention eliminates the need for catalysts, bases, persulfates, persulfates, or iodobenzene acetates considered necessary in the prior art; it only requires electrolysis to obtain α-difluoroselenomethyl ketone derivatives in a mild and efficient manner.

The present invention relates to the technical field of biodegradable materials. Disclosed is a preparation method for a bioactive glass fiber reinforced polylactic acid composite material. The preparation method comprises the following steps: (1) subjecting bioactive glass fibers to a plasma treatment; (2) dissolving chitosan in an aqueous acetic acid solution, and then adding the treated bioactive glass fibers thereto, so as to obtain a mixed solution I; (3) adding a bioactive glass powder to an aqueous sodium tripolyphosphate solution, and then subjecting same to ball milling, so as to obtain a mixed solution II; (4) gradually adding the mixed solution II to the mixed solution I while stirring same, continuously stirring same overnight after the addition is finished, and then conducting filtering and drying, so as to obtain modified glass fibers; and (5) mixing the modified glass fibers with polylactic acid particles, and then subjecting the resulting mixture to melt extrusion, so as to obtain a polylactic acid composite material. In the present invention, by compounding modified bioactive glass fibers with a polylactic acid material, the mechanical strength of the composite material can be significantly improved.

The application relates to a preparation method of 4-chloropyrrolopyrimidine, in particular to a four-step high-yield synthesis of 4-chloropyrrolopyrimidine by taking diethyl malonate and bromoacetaldehyde diethyl acetal as raw materials, through substitution reaction, then ring closure reaction with formamidine acetate, ring closure reaction under acidic conditions, and then chlorination reaction with phosphorus oxychloride; the preparation method of 4-chloropyrrolopyrimidine provided by the synthesis route is a preparation method with high yield, low cost, easy operation and suitability for industrialization.

This invention discloses a method for preparing an aromatic amine-free organic pigment yellow, comprising the following steps: S1, preparing a diazo solution by sequentially adding water, inorganic acid, and diazo components to a diazo tank, stirring and slurrying, then cooling the mixture in the diazo tank to below 0°C and adding nitrite; S2, preparing a coupling solution by sequentially adding water, inorganic alkali, and coupling components to a dissolving tank, stirring and dissolving until clear; S3, coupling reaction by adding water, acetic acid, and surfactant to a coupling tank, stirring and mixing evenly, then slowly adding the diazo solution and coupling solution simultaneously to the coupling tank for a coupling reaction; S4, pigmentation by heating to above 60°C and maintaining the temperature, adjusting the pH of the solution to alkaline; S5, filtering, washing, and drying to obtain an aromatic amine-free organic pigment yellow. This invention is applicable to the synthesis of most mono- and diazo organic pigment yellows, reducing aromatic amine residues during the synthesis process and ensuring that the organic pigment yellow product is free of aromatic amine residues.

The application belongs to the technical field of bioengineering and one-carbon resource utilization, and particularly relates to a strain and application of the strain in acetic acid and acetate production. Acetobacterium woodii The strain is Acetobacterium woodii (Acetobacterium woodii) SL70, which is preserved in the Guangdong Microbial Culture Collection Center and has a preservation number of GDMCC No: 67680 and a preservation date of January 15, 2026. The strain can realize efficient conversion of H2 / CO2 in synthesis gas, and the CO2 utilization rate reaches 1.043 g / L / h. The fermentation process is carried out under anaerobic conditions and no pollutants are discharged, so that resource utilization of industrial tail gas and carbon emission reduction can be realized, and a new technical path for one-carbon resource conversion is provided.

The utility model discloses a kind of waste propylene glycol methyl ether acetate purification devices, it is related to propylene glycol methyl ether acetate purification technical field, including base frame, the inside rotation of base frame is provided with purification tank, the top of purification tank is provided with sealing cover, the inside of purification tank is erected with the mixed tank for storing activated carbon, by the mixed tank of being arranged in the inside of purification tank, the independent storage of waste propylene glycol methyl ether acetate and activated carbon is realized, when carrying out purification, the outer surface of mixed tank is provided with several groups of flow-through hole, so that waste propylene glycol methyl ether acetate can pass through flow-through hole and enter mixed tank and contact with activated carbon, while the liquid after purification can also flow out from mixed tank, the inner wall of mixed tank is attached with dust cloth, prevent activated carbon particle from leaking out of flow-through hole, ensure the smooth progress of purification process, when draining, propylene glycol methyl ether acetate can be discharged alone, greatly simplify subsequent process, improve purification efficiency.

This invention discloses a method for coupling physicochemical treatment and biodegradation of plastics. The method includes the following steps: S1. Mixing plastics, organic solvents, and a metal catalyst, and reacting to degrade them to obtain organic products. The metal catalyst is cobalt acetate and / or manganese acetate; S2. Biodegrading the organic products from step S1 using a mixed colony, which includes *Pseudomonas*, *Bacillus*, *Flavobacterium*, and *Rhodococcus*. This invention uses cobalt acetate and / or manganese acetate as metal catalysts. The catalytic oxidation of the metal catalyst can efficiently depolymerize traditional plastics, overcoming the bottleneck of C-C bond breaking that is difficult for microorganisms to achieve. It can successfully convert plastics into organic products mainly composed of dicarboxylic acids, benzoic acid, and terephthalic acid, and the mixed colony process completely mineralizes the organic products. This method achieves complete removal of plastics without producing any toxic or harmful substances.

A method of manufacturing an eco-friendly thermally conductive adhesive, includes: a first step of mixing zinc oxide and water to prepare an aqueous zinc oxide solution, and sequentially adding zinc acetate, water, urea, and a defoamer to the aqueous solution followed by stirring to prepare a first mixture; a second step of sequentially adding casein protein and a base aqueous solution to the first mixture followed by stirring to prepare a second mixture; a third step of adding ammonia water to the second mixture and then raising temperature followed by stirring to prepare a third mixture; and a fourth step of adding conductive graphite and a dispersant to the third mixture, followed by stirring and cooling.

This invention discloses a method for preparing a nano-zinc sulfide composite material, comprising: (1) dissolving ammonium molybdate in deionized water, stirring evenly to form a 50 g / L solution, then sequentially adding zinc acetate and thiourea, wherein the mass ratio of ammonium molybdate to zinc acetate and thiourea is 2:1, and stirring thoroughly to obtain a mixed solution; (2) transferring the obtained mixed solution to a reaction vessel, reacting at a constant temperature of 160℃ for 12 h, and obtaining a solid powder after treatment; (3) heat-treating at 300-400℃ for 2 h to obtain the nano-zinc sulfide composite material. This invention synthesizes zinc sulfide nanomaterials with different sizes and morphologies, while molybdenum dioxide nanoparticles modify the surface of zinc sulfide. The two work synergistically to have heterogeneous structural characteristics that promote and accelerate electron transport. Using them as electrode materials for electrochemical detection of nicotine and the metabolite cotinine content in cigarettes shows potential application advantages.

This invention discloses a method for preparing ruthenium oxide nanoparticles. The method includes: Step 1, using ruthenium acetate as a raw material, a certain amount is added to acetic acid to prepare a ruthenium acetate solution, and excess concentrated ammonia is added to the ruthenium acetate solution. The mixture is stirred to react and obtain a ruthenium hydroxide suspension. Step 2, the ruthenium hydroxide suspension is uniformly passed into a high-temperature centrifugal drying device. The ruthenium hydroxide suspension is dried and decomposed in the drying chamber to obtain ruthenium oxide nanoparticles. This invention uses acetic acid as a solvent, which allows for complete dissolution of ruthenium acetate, increases the ruthenium content in the solution, and increases the final ruthenium oxide yield. Simultaneously, the addition of excess concentrated ammonia ensures that all ruthenium ions in the solution can form suspended ruthenium hydroxide particles. Furthermore, centrifugal drying prevents the agglomeration of ruthenium hydroxide during its conversion to ruthenium oxide, while also improving the yield and quantity of ruthenium oxide, ultimately obtaining ruthenium oxide nanoparticles. The ruthenium oxide nanoparticles prepared by this invention have advantages such as high purity and small particle size, making them suitable for the preparation of various resistive components and industrial catalysis. At the same time, the preparation process has the advantages of simplicity, high yield, and ease of industrial production.

The present application relates to a kind of anti-metallic effect paint and its preparation method and application, the raw material of the metallic effect paint includes the following mass parts of components: polyester resin 15~30 parts, amino resin 5~15 parts, directional arrangement aid 3~8 parts, cellulose acetate butyrate 15~30 parts, metal pigment 5~10 parts, anti-sedimentation agent 1~3 parts, leveling agent 0.1~1 part, light aging aid 0.2~2 parts and solvent 20~40 parts;The directional arrangement aid uses microgel.Compared with prior art, the present application has excellent storage stability, prevents metal pigment from blooming, and has good paint film brightness and weather resistance.

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 present invention provides an improved process for preparing microparticles comprising glatiramer acetate having low levels of residual organic solvent, in particular dichloromethane. The microparticles are incorporated into long-acting parenteral pharmaceutical compositions in a depot form, suitable for subcutaneous or intramuscular implantation or injection and useful for the treatment of multiple sclerosis.

This invention relates to a phosphate-containing chiral diastereomeric oxime ester compound, its preparation method, and its applications, belonging to the field of organic synthesis technology. This invention introduces a chiral center at a specific location in the molecular structure of the oxime ester compound to form a mixture of diastereomeric stereoisomers. The introduction of the chiral center interferes with intermolecular chiral recognition, thereby effectively suppressing the π-π stacking effect and crystal growth between the aromatic ring cores. Furthermore, the introduction of the phosphate ester structure into the product effectively improves its solubility in propylene glycol methyl ether acetate or cyclohexanone solvents. The photocurable ink prepared using the diastereomeric oxime ester compound of this invention exhibits excellent storage stability and better photosensitivity.

This invention belongs to the field of algae preservation technology, specifically relating to a chitosan-based nano-preservative for spirulina preservation and its preparation method. The preparation method of the chitosan-based nano-preservative includes the following steps: (1) adding eugenol and zinc acetate sequentially to a tannic acid solution, mixing well, and then ultrasonically treating at 35-45℃ for 2-6 hours to obtain a nanosphere system; (2) adding the nanosphere system obtained in step (1) to a chitosan solution, then adding zinc acetate to the chitosan solution, and stirring and reacting at 25-60℃ for 8-12 hours to obtain the chitosan-based nano-preservative. This invention achieves a multi-effect combination of "antibacterial-antioxidant-slow release" through the synergistic effect of the antibacterial action of eugenol, the antioxidant / anti-inflammatory action of tannic acid, and the auxiliary antibacterial and cross-linking action of zinc acetate, thus solving the problem of the functional limitations of single preservation technology.

An asbestos free friction material composition and associated brake pad for vehicles including inorganic and / or organic and / or metallic fibers, at least a binder, at least a friction modifier or lubricant, at least a filler or abrasive and at least a soluble salt of barium and / or calcium and / or aluminum and / or silver with percentage between 0.5-10% by weight. Among them barium carbonate, calcium hydroxide, aluminum triacetate and silver acetate are preferably.

This invention discloses a method for preparing and applying a chitosan-nanofibrillar-based smart indicator membrane loaded with anthocyanins and alizarin. The method includes the following steps: mixing beet powder with hydrochloric acid, washing with water until neutral, and drying; adding sodium hydroxide solution, mixing and reacting, washing with water until neutral, and drying; adding sodium chlorite solution, mixing, adjusting the pH to 3-3.5, reacting, and washing with water until neutral to obtain beet fiber; adding water, homogenizing under ultra-high pressure to obtain a beet nano-suspension; adding the beet nano-suspension to a chitosan-acetic acid solution and stirring, then adding glycerol; adding pigments, mixing, and obtaining a membrane solution; ultrasonically degassing, and drying to form a membrane. This membrane, as a food preservation indicator membrane, possesses both the characteristics and functions of food preservation and indicating food freshness; using beet nanofibers as a supplementary material improves the mechanical properties of the chitosan membrane; the addition of alizarin and anthocyanin mixed pigments enriches the color changes of the indicator membrane and improves its stability.