437 results about "Dimethyl ether" patented technology

The invention provides a gel-state polymer electrolyte as well as a preparation method and application thereof, and belongs to the field of batteries. The gel-state polymer electrolyte provided by the invention comprises the following preparation raw materials: a polar organic solvent, a lithium salt, a lithium salt additive, a liquid flame retardant, a liquid monomer and an initiator, the polar organic solvent comprises 1, 3-dioxolame and ethylene glycol dimethyl ether; the dosage ratio of the lithium salt to the polar organic solvent is 1 mmol: (0.5-2) mL; the mass of the lithium salt additive is 1.5-5% of the total mass of the lithium salt and the polar organic solvent; the volume of the liquid flame retardant is 10-20% of the volume of the polar organic solvent; the volume of the liquid monomer is 10-20% of the volume of the polar organic solvent; the mass of the initiator is 0.5-2% of the total mass of the lithium salt, the polar organic solvent and the monomer. And Li < + > in the lithium salt is released after the type of the solvent is adjusted, so that the Li < + > transference number and the ionic conductivity are improved.

The invention discloses a high-strength moisture-proof gypsum board and a preparation method thereof, and relates to the technical field of gypsum board preparation. The high-strength moisture-proof gypsum board is prepared by dipping the surface paper in the composite dipping liquid and then pouring the surface paper and the gypsum core with the waterproof agent, the composite dipping liquid comprises the methoxy vinyl ether copolymer and the epoxy polyoxymethylene dimethyl ether, and the methoxy vinyl ether copolymer is 2, 3, 5-trimethyl-1, 3-pentanediol monoisobutyrate. According to the present invention, epoxy polyoxymethylene dimethyl ether is prepared by reacting 2, 4-dimethoxymethoxyphenylacetic acid with 2-hydroxyethyl vinyl ether, and the epoxy polyoxymethylene dimethyl ether is prepared by terminating polyoxymethylene dimethyl ether with allyl and then reacting with phthalimide hexperoxy acid, such that the waterproofness and the mechanical property of the gypsum board are improved; the waterproof agent is prepared by reacting hydrogen-containing silicone oil and fluorine-containing hyperbranched amide polyurea urethane, so that the moisture resistance and bonding strength of the gypsum board surface paper are enhanced, and additional mechanical support is provided for the gypsum board.

The invention provides chlorotrifluoroethylene continuously prepared based on a microchannel reactor and a preparation method of the chlorotrifluoroethylene, and the chlorotrifluoroethylene comprises the following raw materials in parts by weight: 1, 1, 2-trifluoro-1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3 The low-temperature refrigerant refrigerant is prepared from the following components in parts by weight: 90 to 100 parts of 1, 2-trichloroethane, 1 to 5 parts of a zinc fluoride induced palladium-copper bimetallic catalyst, 8 to 15 parts of a cyclohexyl dimethyl ether-formic acid composite hydrogen donor, 0.5 to 2 parts of trifluoroacetic anhydride, 0.1 to 0.5 part of a perfluoropolyether lubricant, a proper amount of a low-temperature mixed refrigerant and 15 to 20 percent by weight of diluted hydrochloric acid. According to the invention, the preparation efficiency and product purity of chlorotrifluoroethylene can be improved, and stable operation of the preparation system and reasonable treatment of byproducts can be guaranteed.

The invention discloses nano UV light-cured printing ink and a preparation method thereof, and relates to the technical field of printing ink preparation. The nano UV light-cured printing ink is prepared from nano UV light, the invention discloses a UV (ultraviolet) photoinitiator, which is prepared from the following raw materials in parts by weight: 20 to 40 parts of polyurethane acrylate oligomer, 15 to 30 parts of modified bisphenol A type epoxy acrylate, 10 to 15 parts of tripropylene glycol diacrylate, 5 to 10 parts of ethoxylated trimethylolpropane triacrylate, 5 to 15 parts of modified nano titanium dioxide, 3 to 8 parts of nano silver wire, 2 to 5 parts of photoinitiator 1173 and 1 to 3 parts of benzoin dimethyl ether. The invention relates to a silver-loaded zirconium phosphate composite material which is prepared from the following components in parts by weight: 0.5-2 parts of polyether modified polydimethylsiloxane, 0.3-1 part of a defoaming agent, 1-3 parts of a dispersing agent, 1-5 parts of silver-loaded zirconium phosphate, 0.5-2 parts of an antioxidant 1010, 0.5-2 parts of a coupling agent KH-550 and 10-25 parts of propylene glycol methyl ether acetate. The raw materials are scientifically proportioned and contain various modified components, and parameters of each step are clear. The preparation method is reasonable in process, the performance of the ink is improved through multi-step modification, and the obtained ink is good in dispersity and compatibility, high in curing efficiency and excellent in comprehensive performance and has good practicability and innovativeness.

The invention discloses an internal-acid and external-alkali type organic-inorganic hybrid molecular sieve catalyst as well as a preparation method and application thereof, and belongs to the technical field of heterogeneous catalytic materials and chemical processes. According to the catalyst, a hydrogen type Beta molecular sieve is used as an acidic inner core, polyvinylpyrrolidone (PVP) is used as an organic shell, and a unique inner-acid outer-alkali structure is formed. The preparation method comprises the following steps: hydrothermally synthesizing a hydrogen type Beta molecular sieve with a specific silica-alumina ratio, and then coating PVP through surface adsorption. The catalyst is used for catalyzing the condensation of methylal and trioxymethylene under mild conditions (40-70 DEG C and normal pressure) to prepare polyoxymethylene dimethyl ethers (DMMn). The PVP shell covers acidic sites on the outer surface of the molecular sieve to form an external neutral / weak base and internal strong acid microenvironment, so that the secondary side reaction of the product is effectively inhibited, the trioxymethylene conversion rate of more than 98% and the DMMn selectivity of more than 96% can be obtained in the reaction at 50 DEG C and normal pressure, the product distribution can be regulated and controlled, and the traditional Anderson-Schulz-Flory distribution limitation is broken through. The catalyst disclosed by the invention has the advantages of high activity, high selectivity, mild conditions and easiness in separation, and has a good industrial application prospect.

The invention discloses a small-grain mordenite molecular sieve as well as a preparation method and application thereof, a crystallization process is directionally controlled by adopting a sectional regulation and control crystallization method, so that the morphology and acid distribution of the molecular sieve are regulated and controlled, and the synthesis method is simple in process and suitable for large-scale industrial production; the grain diameter of the small-grain mordenite molecular sieve obtained by the method disclosed by the invention is 15-300nm; the B acid center of the 8-membered ring pore channel accounts for gt of the total B acid center; the catalyst is used for the carbonylation reaction of dimethyl ether, and has good activity and stability.

The invention discloses a CuGa-S-1 catalyst for catalyzing hydrogenation of carbon dioxide to prepare dimethyl ether, an S-1 molecular sieve is used as a carrier, Cu and Ga are used as active components and are uniformly dispersed on the S-1 molecular sieve, the molar ratio of Ga to Cu is 1.0-3.0, the mass fraction of Cu is 2-10%, and the mass fraction of Ga is 2-20%. The invention also discloses a preparation method and application of the CuGa-S-1 catalyst for catalyzing hydrogenation of carbon dioxide to prepare dimethyl ether. The preparation method disclosed by the invention is simple and easy to operate, large-scale industrial production is easy to carry out, and high dimethyl ether selectivity is shown in a reaction for preparing dimethyl ether through carbon dioxide hydrogenation.

The invention relates to the technical field of cosmetics, in particular to an efficient anti-aging composition and a skin care product containing the composition. The invention discloses an efficient anti-aging composition which is prepared from the following raw materials in parts by mass: 12-15 parts of oil-based concentrated active ingredients, 25-35 parts of base collagen liquid, 15-18 parts of Ectoine, 12-16 parts of TWEEN 20 and 22-25 parts of isosorbide dimethyl ether, and the oil-based concentrated active ingredients are prepared from safflower seed oil, an extract of flowers / leaves / stems of herba lysimachiae, an extract of radix astragali membranaci, ubiquinone and vitamin E; the base collagen liquid comprises XVII type collagen, VII type collagen and IV type collagen. Aiming at the problems that an existing skin care product cannot effectively reduce skin wrinkles, improve skin compactness, reduce skin sagging and prevent skin aging for a long time, the composition disclosed by the invention realizes long-term aging resistance from epidermis to dermis, effectively reduces wrinkles, improves compactness and improves skin sagging.

The application discloses a catalyst for preparing polyoxymethylene dimethyl ethers by directly oxidizing methanol, a preparation method and application thereof, and belongs to the field of catalyst preparation and application. The metal oxide and the acidic molecular sieve are effectively coupled to prepare a bifunctional composite catalyst with a core-shell structure, the composition and proportion of the metal oxide and the acidic molecular sieve are regulated, and high-selectivity synthesis of polyoxymethylene dimethyl ethers by directly oxidizing methanol is realized. The unique core-shell structure can effectively regulate the distance and distribution between the two types of active sites, significantly promote the gradual chain growth of methanol oxidation, and obviously inhibit the occurrence of side reactions such as methanol dehydration to dimethyl ether and deep methanol oxidation, so that the high-selectivity synthesis of polyoxymethylene dimethyl ethers by directly oxidizing methanol is realized. The catalyst preparation process is simple and easy to operate, and the one-step oxidation of methanol to prepare polyoxymethylene dimethyl ethers has the advantages of short flow, good atom economy and green process.

The invention discloses a colchicine external preparation with high intradermal residual quantity and percutaneous transmittance as well as a preparation method and application thereof, and belongs to the technical field of pharmaceutical preparations. The invention provides a colchicine external preparation with high intradermal residue and transdermal transmittance. The colchicine external preparation comprises: a) colchicine or a pharmaceutically acceptable salt thereof; b) a penetration enhancer; c) pharmaceutically acceptable excipients and / or excipients; the penetration enhancer is at least one of polyglycerol oleate or isosorbide dimethyl ether. The drug loading capacity and the percutaneous transmittance of the colchicine external preparation disclosed by the invention are remarkably improved. When polyglycerol oleate is selected as a penetration enhancer to prepare colchicine gel, the intradermal retention volume can reach 358.08 micrograms within 20 hours. When isosorbide monomethyl ether is selected as a penetration enhancer to prepare ethosome gel, the accumulated penetration amount can reach 106.87 mu g / cm < 2 >, and the intradermal residual amount can reach 90.58 mu g or above.

The invention relates to a composition with a permeation enhancing effect and application thereof. The composition is prepared from the following components in parts by weight: 10 to 15 parts of ethoxydiethylene glycol, 10 to 15 parts of isosorbide dimethyl ether, 5 to 10 parts of folium artemisiae argyi extract and 1 to 6 parts of tea tree essential oil. According to the permeation enhancing composition, traditional azone easy to sensitize and ethyl alcohol easy to cause stimulation are abandoned, the efficient, safe and lasting permeation effect is finally achieved, and the permeation enhancing composition meets the high-activity component delivery requirement of cosmetics.

The invention relates to a low-temperature-activated hydrothermal stable formaldehyde production tail gas purification catalyst and a preparation method thereof. The catalyst comprises an active component, a carrier, an active auxiliary agent and a hydrothermal stabilization auxiliary agent, wherein the active component is selected from any one or two of Pt, Pd and Ru; the carrier is active aluminum oxide, and the active auxiliary agents are La2O3 and SrO; and the hydrothermal stabilizing aid is borophosphate. The catalyst can be applied to a methanol-to-formaldehyde tail gas purification device, organic matters such as formaldehyde, methanol and dimethyl ether and CO in tail gas are simultaneously removed through catalytic combustion, and the problems that an existing catalyst is high in activation temperature and poor in hydrothermal stability are solved. After the catalyst is modified, the light-off temperature is reduced, the hydrothermal stability is obviously improved, the catalyst still has better low-temperature light-off and high-temperature activity after being aged for 15 hours at the temperature of 650 DEG C, the light-off temperature is not higher than 140 DEG C, outlet CO, methanol and formaldehyde are all smaller than 0.1 ppm, and dimethyl ether is smaller than 20 ppm.

The invention discloses a preparation method and application of an eight-membered ring aluminum-rich mordenite nanosheet. The preparation method comprises the following steps: respectively weighing a silicon source, inorganic alkali, an aluminum source, a template agent Te, water and a metal additive Me according to a molar ratio of 1: (0.1-0.3): (0.02-0.08): (0.1-0.3): (10-40): (0.01-0.1); mixing and stirring the raw materials in an ice-water bath to prepare initial gel; putting the initial gel into a hydrothermal reaction kettle, carrying out hydrothermal crystallization in a drying box, and then centrifuging, filtering and drying to obtain a sodium mordenite molecular sieve; roasting the sodium mordenite molecular sieve to remove the organic template agent; carrying out ammonium ion exchange on the roasted mordenite molecular sieve in a water bath kettle to obtain an ammonium type mordenite molecular sieve; carrying out roasting treatment on the ammonium type mordenite molecular sieve to obtain a hydrogen type octatomic ring aluminum-rich mordenite nanosheet; the eight-membered ring aluminum-rich mordenite nanosheet prepared by the preparation method disclosed by the invention can exert excellent performance in a reaction for preparing acetic acid or methyl acetate through carbonylation of methanol or dimethyl ether.

The present invention belongs to the technical field of fabric color fixing agents and provides a novel acidic color fixing agent free of bisphenol S and a preparation method thereof; the acidic color fixing agent is composed of the following components in parts by weight: 15-25 parts of water, 10-15 parts of phenol, 15-25 parts of dimethylacetamide, 2-5 parts of sodium sulfite, 10-15 parts of acetic acid, 5-7 parts of concentrated sulfuric acid, 15-20 parts of acrylic acid, 2-5 parts of ethylene glycol dimethyl ether, and 1-3 parts of sorbitol; the preparation method comprises the following steps: mixing a formula amount of phenol, dimethylacetamide, acrylic acid, acetic acid, and sodium sulfite, heating, adding concentrated sulfuric acid to react, cooling, adding a formula amount of water, and adding a formula amount of ethylene glycol dimethyl ether and sorbitol to obtain the product. Compared with the prior art, the present invention does not contain bisphenol S, has a good color fixing effect, can effectively improve various fastnesses such as water fastness, perspiration fastness, and seawater resistance, has little effect on the color change of the fabric after treatment, and has good tolerance to hardness ions.

The invention discloses a wide-voltage wide-temperature-range sodium-ion battery electrolyte and a preparation method and application thereof, and belongs to the technical field of sodium-ion battery electrolytes.The wide-voltage wide-temperature-range sodium-ion battery electrolyte comprises sodium salt, an organic solvent and an additive, the organic solvent is selected from one or more of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, dimethyl carbonate, diethyl carbonate, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether and triethylene glycol dimethyl ether, and the additive is selected from one or more of fluoroethylene carbonate, allyl-1, 3-propane sultone, 1, 3-propylene sultone, 1, 3-propylene sultone and 1, 3-propylene sultone. The additive is one or more of 1, 3-propyl sultone, methylene methane disulfonate, ethylene sulfate, trifluoromethanesulfonic anhydride, pentaerythritol bicyclic sulfate, tri (trimethylsilane) phosphate, tri (trimethylsilane) phosphite, tri (trimethylsilane) borate, acesulfame sodium and aluminum trifluoromethanesulfonate, and the additive is one or more of 2, 3-propylene sultone, methylene methane disulfonate, ethylene sulfate, trifluoromethanesulfonic anhydride, pentaerythritol dicyclosulfate, tri (trimethylsilane) phosphate, tri (trimethylsilane) phosphite, tri (trimethylsilane) borate, tri (trimethylsilane) phosphate and tri (trimethylsilane) borate. The electrolyte provided by the invention not only keeps high coulombic efficiency at low temperature, but also has good cycle stability at high temperature.

The invention relates to a method for preparing bio-based isosorbide dimethyl ether through resin catalysis, and belongs to the technical field of organic synthesis. Adding corn starch into a sulfuric acid solution, hydrolyzing into glucose, and filtering to obtain a glucose solution; adding a solid acid catalyst into the concentrated glucose solution, and filtering after reaction; carrying out reduced pressure distillation on the filtrate to obtain an isosorbide crude product, and purifying through recrystallization; the preparation method comprises the following steps: adding isosorbide, a methylation reagent and a basic catalyst into a reaction kettle, stirring for reaction, cooling and filtering; and distilling the filtrate, and collecting fractions to obtain high-purity isosorbide dimethyl ether. The solid acid catalyst is sorbic acid based styryl macroporous cation exchange resin; the styryl macroporous cation exchange resin is soaked in sulfuric acid to be activated and then is mixed with sorbic acid chloride, 2-thiophenecarbonyl chloride and zinc chloride to react, and then washing and drying are performed to prepare the solid acid catalyst; the isosorbide dimethyl ether prepared by the method disclosed by the invention is high in purity and relatively high in yield.

A method for forming an extruded polystyrene foam comprises: (a) providing a thermoplastic melt and a blowing agent in the melt, the blowing agent comprising: (1) from about 10% to about 50% by weight of HCFO-1233zd (E); (2) from about 35% by weight to about 75% by weight of HFC-134a; (3) from about 10% to about 30% by weight of isobutane; and (4) optionally up to about 15% by weight of dimethyl ether; and (b) foaming the thermoplastic material.

The invention discloses flax olive oil for improving, preventing and treating cardiovascular diseases, and belongs to the technical field of grease. The flax olive oil for improving, preventing and treating cardiovascular diseases mainly comprises the following raw material components: olive oil and flaxseed oil, and the mass ratio of the olive oil to the flaxseed oil is (1.5-2.5): 1. Wherein the flaxseed oil is obtained by screening flaxseeds, removing impurities, removing abnormal grains, crushing, extracting for multiple times by adopting a mixed extraction agent, degumming, decolorizing and deodorizing, the extraction temperature is 20-25 DEG C, the liquid-solid ratio is (9-10): 1mL / g, the single extraction time is 35-45 minutes, and the pressure of an extraction tank is 0.30-0.40 MPa; the mixed extraction agent is prepared from the following components in percentage by mass: 18.8 to 37.7 percent of ethanol, 29.7 to 30.4 percent of n-butane, 19.7 to 38.5 percent of dimethyl ether and 12.4 to 12.9 percent of water.

The invention discloses a sodium-ion battery electrolyte and a preparation method thereof, and relates to the technical field of sodium-ion batteries, the electrolyte comprises a sodium salt, a composite solvent, an additive and an auxiliary agent, the sodium salt is formed by compounding sodium bis (fluorosulfonyl) imide, sodium bis (trifluoromethanesulfonyl) imide and modified sodium bis (oxalato) borate, and the composite solvent is formed by compounding sulfolane, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol and 1, 3-butanediol. The auxiliary agent is nano-scale ZIF-8, the additive is 1, 3-propylene glycol dimethyl ether, dimethyl carbonate, fluoroethylene carbonate and ethyl acetate, the additive is modified 1, 3-propane sultone, trimethyl phosphate and hydroquinone dimethyl ether, and the auxiliary agent is nano-scale ZIF-8. According to the electrolyte, sodium bis (oxalato) borate is modified after being treated by hydrogen peroxide and has efficient hydrofluoric acid resistance, meanwhile, hydrofluoric acid generated by the reaction of fluorine-containing sodium salt and water in the electrolyte can be specifically removed by utilizing an auxiliary agent of the nano ZIF-8 and a synergistic effect formed by the sodium salt and the auxiliary agent, and damage of the hydrofluoric acid to a negative electrode SEI film is avoided; and the cycle life of the sodium ion battery is prolonged.

The invention provides a preparation method of bis-[3-(triethoxysilyl) propyl]-disulfide. The preparation method comprises the following steps: S1, under the protection of nitrogen, dropwise adding chloropropene and trichlorosilane into a non-polar solvent, a first catalyst and tripropylamine, reacting at room temperature, taking filtrate, dropwise adding the filtrate into alcohol in a micro-reflux state, reacting, adding a sodium alkoxide / alcohol solution for neutralizing, filtering, and distilling to obtain allyltriethoxysilane; and S2, under ultraviolet light, mixing allyltriethoxysilane, mercaptopropyltriethoxysilane and benzoin dimethyl ether, reacting at room temperature for 2-3 hours, adding sulfur and a second catalyst, carrying out heating reaction, removing low boiling points, cooling, and filtering. According to the preparation method provided by the invention, bis-[3-(triethoxysilyl) propyl]-disulfide is successfully and effectively synthesized, a phase transfer catalyst does not need to be introduced for catalysis, hydrolysis of silane and treatment of saline water are reduced, the yield of single-kettle synthesis is high, and the utilization rate of equipment is high.

The application belongs to the field of organic synthesis, and particularly relates to a synthesis method of 2-(3,3-dimethylbutyl)pyridine. 2-vinylpyridine, brominated tertiary butane, a mixed solution of dimethyl ether and isopropyl ether as a reaction system solvent, nickel iodide as a nickel salt, bipyridine as a ligand, dicyclohexylmethylamine as a base in the system, 2,6-dimethyl-3,5-diethyl-1,4-dihydropyridine as a reducing agent, a photocatalyst 2,4,5,6-tetrakis(9 ‑ Carbazole) - m-phenylenedinitrile, under the condition of room temperature and nitrogen atmosphere, a reduction cross-coupling reaction is used to synthesize 2-(3,3-dimethylbutyl)pyridine. The application uses inexpensive nickel metal as a catalyst, constructs a cross-coupling reaction of carbon-carbon bond, and has the advantages of mild reaction condition, high economy and the like.

The invention relates to the technical field of civil fuels, in particular to a civil ether-based fuel which is formed by mixing C5 and dimethyl ether. The content of the C5 is 10-30% by weight, the content of the dimethyl ether is 70-90% by weight, the C5 adopted by the civil ether-based fuel is a low-pressure flammable liquid and can still be stored in a common low-pressure steel drum after being mixed with the dimethyl ether, a high-pressure container is not needed, and the leakage and explosion risks are reduced; and during combustion, 'air-light hydrocarbon mixed gas' generated by a special gas generator is saturated gas, is easy to mix with air and is not easy to gather together, so that the occurrence of emergency accidents such as explosion or poisoning and the like is reduced.

This invention belongs to the field of sodium-ion battery technology, and discloses a wide-temperature-range sodium-ion battery electrolyte, its preparation method, and its application. This invention uses dimethyl ether solvents of different chain lengths as the main solvent, and matches ether diluents and film-forming additives to prepare a sodium-ion battery electrolyte capable of operating in a wide temperature range of -40 to 60°C. This type of electrolyte exhibits a low freezing point and high thermal stability. Furthermore, the solvent-solvent interactions between the ether diluents and different dimethyl ether solvents in the system weaken the sodium... + The interaction between the sodium ion and the dimethyl ether solvent improves sodium ion dynamics; furthermore, the anion enters the solvation structure and participates in the construction of a stable interface, achieving high rate and high cycling stability.

This invention discloses a Cu-Si matrix for the synthesis of methanol / dimethyl ether from CO2. x Al 1‑x The catalyst preparation method and application are described. This catalyst can precisely control the selectivity of methanol and dimethyl ether. The catalyst is prepared from silica sol, aluminum isopropoxide, and copper nitrate trihydrate as raw materials. The precursor solution is uniformly mixed with a hexadecyltrimethylammonium chloride solution, followed by aging, evaporation, drying, and low-temperature calcination to produce a Cu-Si catalyst with defined active sites. x Al 1‑x Cluster catalyst, Cu nanoclusters encapsulated by Si with a defined composition x Al 1‑x Enclosed, but due to Si x Al 1‑x The different Si ratios and placement methods restrict the size and electronic states of Cu nanoclusters. As can be seen from the TEM images, the size of Cu nanoclusters increases with increasing Si content, thus forming Cu-Si nanoclusters with different active sites and different Cu electronic states. x Al 1‑x catalyst.

The invention discloses an aluminum alloy complex cavity diffusion welding method, which is characterized in that a uniform and compact organic molecule adsorption protection layer is formed on the surface of aluminum by completely immersing a cleaned blank in a diethylene glycol dimethyl ether solution for ultrasonic-assisted treatment. The protective film can effectively isolate air at normal temperature and prevent the oxidation film from regenerating; and in the initial stage of diffusion welding temperature rise, the aluminum alloy can be completely decomposed and volatilized, no impurity is left, and the high-activity clean aluminum surface is exposed. According to the method, diffusion welding is carried out under the conditions that the vacuum degree is high, the temperature is 500-560 DEG C and the pressure is 5-15 MPa in cooperation with a positioning tool system matched with the thermal expansion coefficient, aluminum atoms are fully diffused under the condition that no oxidation film hinders exist, and high-quality metallurgical bonding is formed. By means of the technical scheme, the problem that the welding rate is low due to an oxidation film on the surface of the aluminum alloy is successfully solved, meanwhile, the defects of ultrahigh vacuum equipment input and middle layer material introduction are overcome, and the manufacturing quality and production efficiency of complex aluminum alloy components are greatly improved.

The invention belongs to the technical field of organic synthesis. The invention particularly relates to a synthesis method of chiral beta-diaryl ethanol. The physiological activity, the pharmacological action and the material performance of the chiral molecule are directly determined by the spatial configuration of the chiral molecule. Therefore, efficient construction of chiral compounds is always the core research direction of organic synthesis and medicinal chemistry. Wherein the chiral beta-diaryl ethanol is a kind of key intermediates with irreplaceable application value. According to the invention, the Suzuki-Miyaura type asymmetric ring-opening coupling reaction of nickel catalyzed aryl epoxy and aryl boric acid with high stereoselectivity is realized, and the asymmetric ring-opening coupling reaction is used for synthesizing chiral beta-diaryl alcohol compounds. The method is wide in substrate compatibility and raw material source, mild in reaction condition, free of exogenous alkali and convenient to operate. An aryl epoxy compound and arylboronic acid are used as raw materials, diethylene glycol dimethyl ether nickel bromide is used as a catalyst, chiral biimidazoline is used as a ligand, under the promotion of sodium iodide, reaction is performed in an ethanol solvent according to the following reaction formula at the temperature of 50 DEG C for 10 hours, and the chiral beta-diaryl ethanol compound with the high ee value is obtained.

The invention discloses a recovery method and application of ethylene glycol dimethyl ether, and belongs to the technical field of solvent recovery, and the recovery method comprises the following steps: mixing and stirring a recovery solvent and water, and standing for layering to obtain a lower water layer; distilling the water layer to obtain a distillation solvent; adding a dehydrating agent into the distillation solvent, stirring, and standing for layering to obtain supernatant liquid; and adding sodium filaments into the clear liquid for reaction, distilling and recovering ethylene glycol dimethyl ether. In conclusion, according to the recovery method and application of ethylene glycol dimethyl ether, through multi-step cooperative operation of extraction, distillation-alkaline dehydration and removal of tert-butyl alcohol from sodium filaments, accurate removal of impurities is achieved, the purity of solvent recovery in production of tert-butyl compounds is guaranteed, multiple targets of resource circulation, cost reduction and environmental protection standard reaching are achieved, and the recovery method and application of ethylene glycol dimethyl ether are suitable for industrial production. And a feasible technical scheme is provided for industrial sustainable production of the tert-butyl compound.

The application discloses a developing etching process for producing a PCB (Printed Circuit Board), and belongs to the field of PCB processing, which comprises the following steps: S1, using a pre-etching agent to pre-etch the PCB; S2, using an etching-resistant agent to etching-resistantly treat the line sidewall of the PCB after pre-etching; S3, using a main etching agent to etch the PCB after pre-etching after etching-resistant treatment; the pre-etching agent comprises the following components in parts by weight: 30-40 parts of citric acid, 5-8 parts of EDTA, 3-5 parts of a non-ionic or anionic surfactant, and 1-3 parts of a coupling agent; the main etching agent comprises the following components in parts by weight: 40-50 parts of ferric chloride, 10-15 parts of maleic acid, 10-15 parts of an amino acid, 3-5 parts of hydrogen peroxide, 1-3 parts of a pH regulator, and 1-2 parts of a rare earth oxide; the etching-resistant agent is a resin containing a double bond and ethylene glycol dimethyl ether, and the mass ratio of ethylene glycol dimethyl ether to the resin containing a double bond is 1:10. The application can guarantee high-quality etching effect and solve the problem of etching measurement.

The invention provides an aerosol-type face pack cosmetic that, when dispensed, forms a flexible, easy-to-use, and low-irritation resin foam that easily adheres to the face, such as around the eyes and nose. It also allows the fermented liquid contained in the resin foam to easily seep out, making it easy to apply the fermented liquid to the face and less likely to cause tightness. [Solution] An aerosol pack cosmetic comprising a beauty serum and dimethyl ether, wherein the beauty serum comprises at least one fermentation solution selected from Saccharomyces / Anzange ferment filtrate, Saccharomyces / Human (fibroblast / mononuclear cell) induced pluripotent cell culture conditioned medium ferment filtrate, Galactomyces / Eryngium multiflorum callus culture ferment filtrate, and a resin.

The present invention provides a blowing agent for producing extruded polystyrene foam having low lambda over time and low foam density. [Solution] The foaming agent comprises (a) a first co-foaming agent consisting of (a) about 50% to about 70% by weight of HFO and / or HFCO having three or four carbon atoms, (b) about 2% to about 15% by weight of methyl formate, (c) a second co-foaming agent consisting of about 20% to about 30% by weight of dimethyl ether, isobutane and combinations thereof, and (d) a third co-foaming agent consisting of about 2% to about 25% by weight of carbon dioxide, acetone and combinations thereof.