34 results about "4-Butyrolactone" patented technology

The invention discloses dielectric paste for a metal aluminum substrate thick film circuit and a preparation method thereof. The invention aims to prepare the dielectric paste matched with a metal aluminum substrate. The dielectric paste is characterized in that SiO2, Na2O, B2O3, K2O, BaO, CaO, Co2O3, TiO2, P2O5, V2O5, Sb2O3 and Cr2O3 are combined to prepare microcrystalline glass powder; and the microcrystalline glass powder and an organic binder which consists of terpinol, butyl carbitol, butyl carbitol acetate, tirbutyl citrate, 1,4-butyrolactone, nitroncellulose, ethyecellulose, hydrogenated castor oil and lecithin are put in a vessel for stirring and rolling by a three-roll roller mill in a weight ratio of the microcrystalline glass powder to the organic binder of 70-90 parts: 30-10 parts so as to prepare the finished product dielectric paste. The dielectric paste is mainly used as the dielectric paste of the thick film circuit formed by being printed on the metal aluminum substrate.

The invention discloses conductive ink and a preparation method thereof. The conductive ink consists of the following components in percentage by mass: 1 to 2 percent of carbon powder, 3 to 5 percent of organic carrier A, 50 to 65 percent of sheet silver, 0.5 to 1 percent of nickel powder, 30 to 45 percent of organic carrier B, and 0.1 to 0.2 percent of dispersant, wherein the organic carrier A is formed by completely dissolving diethyl adipate or 2-butoxyethyl acetate with mass percentage of between 65 and 75 percent with polyester resins or acrylic resins with mass percentage of between 25 and 35 percent; and the organic carrier B is formed by completely dissolving 1,4-butyrolactone or terpineol with mass percentage of between 62 and 77 percent with a chloride-vinyl acetate resin with mass percentage of between 22 and 38 percent, and then adding a coupling agent with mass percentage of between 0.05 and 1 percent into the mixture. Compared with the prior carbon-silver paste, the carbon powder of the conductive ink is combined with paste better, carbon-silver paste is more compact, and the conductance is better when the compactness is better.

The invention provides YBCO thick film resistance paste based on a stainless steel base board and a preparation method thereof, belonging to electronic material. The paste comprises solid phase component and organic carrier component, wherein the organic carrier component comprises the following components based on the parts by percentage of: 50-90% of terpinol, 1-20% of ethocel, 0-30% of tirbutyl citrate, 0-10% of 1, 4-butyrolactone, 0-9% of nitro cellulose, 0-8% of hydrogenated castor oil and 0-10% of lecithin; the weight ratio of the solid phase component to the organic carrier is equal to (60-85):(40-15); according to the weight ratio, the component of the solid phase component is as follows: YBCO ceramic powder: glass powder=(60-9.9):(40-0.1); the YBCO ceramic powder comprises Y2O3, BaO and CuO; according to the mole ratio, Y2O3: BaO: CuO=(1-2): (1-8): (1-8); the glass is SiO2-B2O3-Na2O-Al2O3-BaO-Li2O-ZnO series glass; and the weight percentage of each component of the glass is as follows: 20-50% of SiO2, 5-40% of B2O3, 10-50% of Na2O, 0-20% of Al2O3, 0-20% of BaO, 0-30% of Li2O and 0-20% of ZnO. The invention has the characteristics of low cost, large power and good stability, etc.

The invention relates to a method for preparing a film material by coating polyvinylidene fluoride on glass fiber cloth. The method comprises the following steps of: mixing components uniformly in part by mass according to a latex formula to prepare polyvinylidene fluoride latex, coating the latex on the surface of the glass fiber cloth to form a coating, keeping for 10 to 15 minutes at the temperature of between 185 and 195 DEG C, cooling, curing, and thus obtaining the film material, wherein the coating quantity of the latex on the surface of the glass fiber cloth is 20 to 400 g / m<2>; the latex formula contains 100 parts of polyvinylidene fluoride and 50 to 450 parts of solvent; and the solvent is selected from one of 1,4-butyrolactone, N,N-dimethyl acetamide and dimethyl sulfoxide. Compared with the original glass fiber cloth, the prepared film material has the advantage that: long-term acid and alkali resistance, high-temperature resistance, flame-retardant property and the like are remarkably improved. The film material can be used as an ideal material for industrial protection, electric welding screening, fire proofing in halls and smoke-proof inorganic roller shutters, and can be used for heat insulation coatings of heaters or freezers and the like.

The invention relates to a process for synthesizing a medicinal intermediate and particularly relates to a process for synthesizing an aminopropanol, which has the advantages of safe raw materials, high yield and mild reaction condition. According to the technical scheme of the invention, ring opening is carried out on 1,4-butyrolactone, serving as a raw material, under the action of hydrazine hydrate, the aqueous solution of sodium nitrite is added to generate acyl azide, and finally the rearranging is carried out to generate 3-aminopropanol.

The invention discloses a nonaqueous electrolyte solution for improving lithium ion battery cycling stability. The nonaqueous electrolyte solution comprises 0.001 to 2mol / L of a lithium salt, 0.01 to 10% by mass of 2,3-cyclohexane-1,4-butyrolactone, a carbonic ester and / or ether organic solvent, and 0 to 0.5mol / L of other functional additives. The nonaqueous electrolyte solution can inhibit the decomposition of a lithium ion battery electrolyte on the surface of a battery material, protect anode and cathode materials, improve a cycle life and a service life of a lithium battery, inhibit battery resistance improvement, improve a battery capacity retention rate, and improve a battery capacity retention rate and a battery cycle life in normal-temperature and high-temperature environments.

The invention provides a new and effective method for asymmetrically compositing triptolide, belonging to the chemical composite field. The method takes 5-methoxyl-2-tetralone and 2-(2-iodine ethyl)-1, 4-butyrolactone as initial materials and composites the triptolide by chiral induction. The method is brief and convenient in operation and has high yield. As the reaction condition is mild, the composite method is easily industrialized and is further used for large-scale synthesis of target compounds.

The present invention discloses a method for efficiently synthesizing beta-benzyl butyrolactone having a specific configuration. The method is characterized in that phenylpropionic acid or a derivative thereof is adopted as a starting material, the phenylpropionic acid or the derivative thereof and an oxazolidone chiral prosthetic group are subjected to condensation, a haloacetic acid ester attacks the carbonyl ortho position carbon of the phenylpropionic acid under the effect of a large steric hindrance organic alkali, the prosthetic group is hydrolyzed and recovered after the specific chiral center is successfully constructed, and the corresponding product is subjected to an intramolecular ester exchange reaction to generate the beta-benzyl butyrolactone having the specific configuration. According to the present invention, the prepared beta-benzyl butyrolactone can be used for chemical synthesis of a lot of dibenzyl type lignins having potential medicinal values, and has characteristics of cheap and readily available raw materials, short step, high yield, and high optical purity.

The invention discloses a glass degumming agent and a degumming method. The glass degumming agent comprises following components, by mass, 25 to 30% of a main solvent, 15 to 25% of a cosolvent, 1 to 3% of a surfactant, 0.5 to 2% of a pH adjuster, and the balance deionized water. The main solvent is at least one selected from acetophenone, anisole, cyclohexanol, and phenol; the cosolvent is at least one selected from dimethyl sulfoxide, dipropylene glycol dimethyl ether, and 1,4-butyrolactone. According to a preparation method, co-effect and mutual cooperation of the main solvent, the cosolvent, the surfactant, and the pH adjuster are capable of realizing high qualified rate degumming; technical problems in the prior art are solved; practical application value is high; great enterprise economical benefit is achieved; the degumming method technology is simplified; technology parameters are easy to control; complete degumming is realized; no product defect such as recess or scratch is caused after degumming; and product qualified rate is high.

The invention relates to a method for biological catalyzed synthesis of optically active alkyl lactone. The method comprises the following steps: (1) catalyzing asymmetric reduction of a carbonyl acid to synthesize optically active hydroxy acid by using a biological catalyst; (2) in an acid environment, cyclizing the optically active hydroxy acid, thereby generating an optically active lactone compound. Freshly cultured candida parapsilosis cells or a cell-free extract is adopted as the biological catalyst for catalyzing stereoselective reduction of 4-carbonyl capric acid and 5-carbonyl capric acid, and subsequently the components are cyclized in the acid environment so as to obtain the lactone compound, so that (R)-(+)-4-hexyl-4-butyrolactone and (R)-(+)-5-amyl-5-valerolactone can be efficiently prepared. Compared with the prior art, the method is easy in preparing cells of the strain and extracts of the cells, high in stereoselectivity, simple in process for catalytic preparation of (R)-(+)-4-hexyl-4-butyrolactone and (R)-(+)-5-amyl-5-valerolactone, environment-friendly, and very good in industrial application prospect.

A method of detecting hypoxia. Detecting hypoxia includes detecting, in exhaled breath, at least one indicator for hypoxia. The at least one indicator is selected from the group consisting of pentanal, 2-pentanone, 2-hexanone, 2-heptanone, 2-cyclopenten-1-one, and 4-butyrolactone.

The invention mainly relates to the technical field of electrolyte, and discloses a supercapacitor electrolyte which is manufactured by the raw materials of the following parts by weight: 51-53 partsof 1,4-butyrolactone, 37-39 parts of propylene carbonate, 32-34 parts of 2-methyl-2-propanol, 28-30 parts of glycidyl methacrylate, 24-26 parts of acrylic acid-2-hydroxyethyl ester, 13-15 parts of sec-butyl acetate, 11-13 parts of acrylic acid-2-ethyl hexyl acrylate, 1.6-1.8 parts of ditrifluoromethane lithium sulfimide, 1.1-1.3 parts of lithium hexafluorophosphate and 0.3-0.5 part of benzyl triethylammonium chloride. The supercapacitor electrolyte is safe and environment-friendly, and the situation of volatilization of toxic substances caused by overcharging of the capacitor does not occur inuse so that the environment and the human health can be protected; the electrolyte is appropriate in viscosity, convenient to use and stable in the property, and the specific capacitance is enhancedfor 10.8%, the electric storage capacity is enhanced for 13.5%, the sales volume is enhanced for 11.4% and the economic income is enhanced for 13.7%.

A process is disclosed for producing (R)-3-hydroxy-4-butyrolactone from its enantiomer, (S)-3-hydroxy-4-butyrolactone. The (R)-enantiomer can be advantageously utilized in several organic synthesis and industrial processes, such as e.g. GABOB and (R)-carnitine preparation.

The invention relates to a synthetic method of natural sesquiterpene lactone crepin (8-Epigrosheimin) with anti-ameba protozoon activity. The method comprises the following steps: synthesizing 2-methyl-3-methoxyl methyl-5-isopropenyl-cyclopentanealdehyde which is obtained by synthesizing carvone with 3-bromomethyl-5H-furan-2-one which is obtained by synthesizing by 1,4-butyrolactone under an action of zinc to obtain an intermediate A; performing alkali ring opening followed by acidification to obtain an intermediate B; performing Michael addition on thiophenol to obtain an intermediate C; oxidizing with Swern, and cyclizing with the catalysis of Lewis acid to obtain an intermediate D; regenerating double bonds by oxidization and thermal elimination to obtain an intermediate E; and performing deprotection and selective oxidation to obtain a target compound. The method is characterized by conveniently obtaining the optically pure target compound by using only one protective group without any other chiral reagents, catalyst or noble metal, and realizing first total synthesis of the compound. The material is easily obtained, the operation is simple, and the yield is high. The compound is expected to have great treatment application as a specific drug for treating amebic liver abscess.

The invention belongs to the technical field of waste gas treatment, and discloses a method for adopting a high-efficiency and low-loss solvent to carry out absorbing treatment on ethyl acetate. The method adopts at least one solvent from N-methyl pyrrolidone, N,N-dimethylacetamide, 1,4-butyrolactone, dioctyl phthalate and methyl nylon acid to carry out countercurrent contact absorption on waste gas containing ethyl acetate in an absorption tower, then an absorbent is subjected to secondary rectification regeneration, and an ethyl acetate product and a regenerative absorbent with high purity can be obtained. The method has a higher absorption efficiency on ethyl acetate, the absorption saturability is higher, the loss of the solvent is lower, and the key problems that the ethyl acetate waste gas is hard to treat, and the emission standard cannot be met are solved.

The invention belongs to the semiconductor optoelectronic material and device preparation technology field, and discloses a method for rapid preparation of large-area perovskite crystals. The method comprises the following steps: certain amounts of lead halide and methyl ammonium halide are weighed, mixing is carried out, then 1,4-butyrolactone, dissolving is carried out, and a perovskite solution is prepared; then the prepared perovskite solution is added to an organic solvent with a certain amount, and perovskite crystals are precipitated. Perovskite crystals are precipitated rapidly through a solution extraction mode, the method is simple and practical, the repeatability is high, external requirements are not high, different organic solvents can be selected for growth according to practical demands to obtain monocrystalline particles with different sizes, the maximum monocrystalline particle size can reach dozens of micron and thus the monocrystalline particles have great advantages at the aspect of manufacturing of photoelectric devices.

The invention relates to an interlayer silicon carbide microwave heat structure crucible and a preparation method thereof. The preparation method is characterized in that a gap between two stacked quartz crucibles is filled with A silicon carbide slurry, and the interlayer silicon carbide microwave heat structure crucible is prepared after high-temperature sintering; the silicon carbide slurry isprepared from, by mass, 70-85% of a silicon carbide powder, 5-15% of a sintering aid and 10-25% of an organic matter; the sintering aid is a MgO-Al2O3-SiO2-B3O2 glass powder, and is prepared from, bymass, 18-25% of MgO, 17-23% of Al2O3, 50-55% of SiO2 and 5-15% of B3O2; and the organic matter is prepared from, by mass, 70-90% of butyl carbitol, 5-13% of 1,4-butyrolactone, 1.5-3.5% of ethyl cellulose and 1.5-3.5% of sorbitan trioleate. The method has the advantages of omission of a mold for preparing the crucible, and facilitation of improvement of the wave absorbing performance of silicon carbide by using the inner and outer two-layer quartz crucible as the wave-transparent impedance matching layer of the silicon carbide material; and the preparation method is simple, and the crucible canbe widely applied to microwave heating.

The invention relates to a synthetic method for an 8-Epigroshiemin compound against amoeba protozoiasis. The synthetic method comprises the following steps: catalyzing 5-Isopropenyl-3-methoxymethoxy-2-methyl-cyclopentanecarbaldehyde obtained by synthesis of carvone and trimethyl enol silicon ether of 1, 4-butyrolactone by Lewis acid to obtain an intermediate to further obtain intermediate diol; oxidizing the intermediate diol to form a lactonic ring, and hydrolyzing and acidifying the lactonic ring under alkaline condition; activating carbonyl by using Vilsmeier reagent, reducing and oxidizing the lactonic ring to obtain aldehyde, and catalyzing the aldehyde by the Lewis acid to obtain a ring-closed product three-dimensionally and specifically; and then introducing methane into the lactonic ring to obtain the target compound through protection removal and selective oxidization. The method synthesizes the compound with higher yield; and activity tests show that the compound has stronger resistance to amoeba protozoiasis activity, and can be used as a specific medicine for treating the amoeba protozoiasis.

The present invention provides a positive photoresist composition excellent in exposure speed, the rate of a residual film, etc., and capable of improving the work environment because a slight offensive odor is emitted. The positive photoresist composition contains a polymer resin for forming a photoresist film, a photosensitive compound which varies the solubility of the photoresist film by exposure and 3-methoxybutyl acetate, 2- heptanone and 4-butyrolactone as solvents.

A photoresist composition including a polymer resin for forming a photoresist layer, a photosensitive chemical that changes the solubility of the photoresist layer when exposed to some form of radiation and 3-methoxybutyl acetate and 4-butyrolactone as a solvent, is provided. The composition has a good photosensitivity and remainder ratio and no unpleasant odor.

The invention belongs to the technical field of food safety detection, and particularly relates to a method for authenticating plant oil and waste food oil through SIFT / MS. The method detects 28 components, namely, furan, acrylamide, furfural, 2-amyl furan and acrolein which are produced by heating and inducing grease, external pollutants including citral, limonene, diallyl sulfide, m-cresol, 4-isopropyltoluene and methyl chavicol, oxidation decomposition aldehyde products including heptanal, octanal, hept-2-enal, 3-hexene aldehyde, trans-2-octen-1-al and (E, E)-2- decadienal, oxidation decomposition acid products including acetic acid, propionic acid, butyric acid, valeric acid and caproic acid, and other oxidation decomposition products including acetone, butanone, 2-heptanone, 1,3-propanediol, 1,4-butyrolactone and propyl propionate, thereby authenticating plant oil and waste food oil. The method saves reagent cost, is free of advanced concentration, column separation and standard products, and has the advantages of being high in sensitivity, simple, rapid, accurate and the like.

The invention relates to a method for biocatalytically synthesizing optically active alkyl lactones. The method comprises the following steps: (1) using a biocatalyst to catalyze the asymmetric reduction of oxoacids to synthesize optically active hydroxyacids; (2) in an acidic environment, using The optically active hydroxy acid is cyclized to form an optically active lactone compound. Use freshly cultured Candida parapsilosis cells or cell-free extracts as biocatalysts to catalyze the stereoselective reduction of 4-oxodecanoic acid and 5-oxodecanoic acid, followed by cyclization into lactone compounds in an acidic environment, with high efficiency Preparation of (R)‑(+)‑4‑hexyl‑4‑butyrolactone and (R)‑(+)‑5‑pentyl‑5‑valerolactone. Compared with the prior art, the cells and extracts thereof of the strain of the present invention are easy to prepare, have strong stereoselectivity, and catalyze the preparation of (R)-(+)-4-hexyl-4-butyrolactone and (R )‑(+)‑5‑pentyl‑5‑valerolactone has a simple process, is environmentally friendly, and has good industrial application prospects.

The invention provides YBCO thick film resistance paste based on a stainless steel base board and a preparation method thereof, belonging to electronic material. The paste comprises solid phase component and organic carrier component, wherein the organic carrier component comprises the following components based on the parts by percentage of: 50-90% of terpinol, 1-20% of ethocel, 0-30% of tirbutyl citrate, 0-10% of 1, 4-butyrolactone, 0-9% of nitro cellulose, 0-8% of hydrogenated castor oil and 0-10% of lecithin; the weight ratio of the solid phase component to the organic carrier is equal to(60-85):(40-15); according to the weight ratio, the component of the solid phase component is as follows: YBCO ceramic powder: glass powder=(60-9.9):(40-0.1); the YBCO ceramic powder comprises Y2O3, BaO and CuO; according to the mole ratio, Y2O3: BaO: CuO=(1-2): (1-8): (1-8); the glass is SiO2-B2O3-Na2O-Al2O3-BaO-Li2O-ZnO series glass; and the weight percentage of each component of the glass is as follows: 20-50% of SiO2, 5-40% of B2O3, 10-50% of Na2O, 0-20% of Al2O3, 0-20% of BaO, 0-30% of Li2O and 0-20% of ZnO. The invention has the characteristics of low cost, large power and good stability, etc.

The invention relates to a production method of a curing agent, in particular to a production method of an alkali phenolic curing agent for casting. Propylene ester, 30%-70% glyceryl triacetate, 10%-30% 1,4 butyrolactone and 0%-30% dibasic carboxylate, after adding, continue stirring for 30-40 minutes, The material is discharged, measured and packaged, and the content of the above-mentioned raw materials is a percentage by weight; the method of the invention is unique, can effectively prevent defects such as air holes and cracks in steel castings, and the performance of the process product is good.

The invention belongs to the technical field of food safety detection, and in particular relates to a method for identifying vegetable oil and waste table oil by using SIFT / MS. The present invention measures furan, acrylamide, furfural, 2-pentylfuran, acrolein, exogenous pollutants citral, limonene, diallyl sulfide, m-cresol, 4-isopropyl Toluene, methyl piperonol, oxidative decomposition products: aldehydes such as heptanal, octanal, 2-heptenal, 3-hexenal, 2-octenal, (E, E)-2-decadienal , acids such as acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, other oxidative decomposition products such as acetone, butanone, 2-heptanone, 1,3-propylene glycol, 1,4-butyrolactone, propionate Esters 28 components, and then identify vegetable oil and waste cooking oil. The method not only saves the cost of reagents, but also has no pre-concentration, no column separation, no need for standard products, and has the advantages of high sensitivity, simplicity, speed, accuracy and the like.

The invention belongs to the field of fine chemistry, and particularly relates to a synthetic method of 4-methyl-4-(cis-3-hexenyl)-4-butyrolactone. The method comprises the following steps: taking leaf alcohol as a starting material, enabling the leaf alcohol to react with thionyl chloride to generate cis-1-chloro-3-hexene, first reacting with metal magnesium to obtain a cis-3-hexenyl Grignard reagent, then reacting with acetyl chloride to generate cis-5-hexene-2-ketone, and then reacting with methyl propiolate in the presence of n-butyllithium to obtain cis-4-methy-4-hydroxyl-7-decene-2-acetylenic acid methyl ester, and finally directly performing the reaction cyclization with NaBH4 under the catalysis of CuCl to obtain the 4-methyl-4-(cis-3-hexenyl)-4-butyrolactone. The method is environment-friendly, low in cost and suitable for the industrialization production.

The invention relates to a bio-organic fertilizer and a production method thereof. The production method comprises the following steps: adding 1,4 butyrolactone in a bio-organic fertilizer to obtain the bio-organic fertilizer. By addition of the 1,4 butyrolactone, growth of crops can be promoted, and the use amount of the fertilizer is reduced.

The invention discloses a lithium battery electrolyte and a preparing method thereof. Water contained in a non-aqueous solvent is removed through a molecular sieve dehydrating device, and then lithium hexafluorophosphate and N,N-dimethyl-N-ethyl-N-2-methoxyethyl ammonium bis(trifluoromethylformamide) imide are dissolved in the non-aqueous solvent, so that the electrolyte is prepared. The non-aqueous solvent is one or more propylene carbonate, ethylene carbonate, 1,4-butyrolactone, N,N-dimethylformamide, tetramethylene sulfone, 3-methylsulfolane and acetonitrile. The lithium battery electrolyte prepared through the preparing method is high in electrochemical stability, and has high electrical conductivity and a wide electrochemical window.