4903 results about "Organosolv" patented technology

The invention relates to a high-capacity lithium-ion electrolyte, a battery and a preparation method of a battery, in particular to the high-capacity lithium-ion electrolyte and the battery using the high-capacity lithium-ion electrolyte and the preparation method of the battery. The electrolyte disclosed by the invention comprises lithium salt and non-aqueous organic solvent, and also consists of the following components in weight percent in terms of the total weight of the electrolyte: 0.5-7% of film-forming additive, 0-15% of flame-retardant additive, 2-10% of antiovefill additive, 0.01-2% of stabilizer and 0.01-1% of wetting agent; the electrolyte can enable the anode with high Ni content to work stably, and reduce the battery cost; the high-capacity lithium-ion battery can perform high ratio capacity and excellent safety and high temperature property and cyclic life fully due to the addition and synergetic functions of various functional additives.

The invention relates to a non-aqueous electrolytic solution used for lithium secondary batteries, in particular to an electrolytic solution capable of improving the high-voltage cycle performance of lithium batteries and the storage performance of the electrolytic solution. The non-aqueous electrolytic solution disclosed by the invention contains 0.01-2% by weight of antioxidant based on the total weight of the electrolytic solution, and due to the incorporation of the additives, the storage stability of the electrolytic solution is obviously improved. The non-aqueous electrolytic solution also contains lithium salt, a non-aqueous organic solvent and also contains the following components in percentage by total weight of the electrolytic solution of 0.5-7 percent of film-forming additives, 0-15 percent of flame-retardant additives, 2-10 percent of overcharge protection additives, 0.01-0.02 percent of a stabilizing agent and 0.01-1 percent of a wetting agent. According to the non-aqueous electrolytic solution provided by the invention, batteries can stably work under the high voltage of 4.3V or above, due to the synergic action of the incorporated additives with various functions, the high-capacity lithium-ion batteries can bring high specific energy into full play and have outstanding safety and high-temperature performances and cycle life.

The invention relates to an in-situ composite silicon-based multibasic oxide oxide aerogel material and its preparation method, especially to a multibasic oxide oxide aerogel material which is prepared by the following steps: using soluble glass as a silicon source, mixing metallic oxide corresponding water-soluble metal salt, adding acid or alkali to adjust pH value of the system so as to form multibasic oxide sol; mixing the multibasic oxide sol with a water-soluble organic solvent, filtering to remove produced precipitate so as to obtain salt-free multibasic oxide sol, carrying out a sol-gel method, aging, modifying and drying. By a mature silica aerogel technology, the multibasic oxide oxide aerogel material is prepared by in-situ polymerization of other oxide components which are not easy to separately prepare aerogel. In addition, the multibasic oxide oxide aerogel material has excellent properties, such as high temperature stability, high activity, magnetic property and the like, none of which are present in single-component silica aerogel. The product is widely applied in fields of high temperature insulation, sound insulation, catalysts, catalytic carriers, battery electrodes, electromagnetism, resistance, gas sensitivity, humidity sensitivity, luminescent materials and the like.

A modular process for organosolv fractionation of lignocellulosic feedstocks into component parts and further processing of said component parts into at least fuel-grade ethanol and four classes of lignin derivatives. The modular process comprises a first processing module configured for physico-chemically digesting lignocellulosic feedstocks with an organic solvent thereby producing a cellulosic solids fraction and a liquid fraction, a second processing module configured for producing at least a fuel-grade ethanol and a first class of novel lignin derivatives from the cellulosic solids fraction, a third processing module configured for separating a second class and a third class of lignin derivatives from the liquid fraction and further processing the liquid fraction to produce a distillate and a stillage, a fourth processing module configured for separating a fourth class of lignin derivatives from the stillage and further processing the stillage to produce a sugar syrup.

The invention belongs to the technical field of self-repairing elastomer materials, and discloses a high-strength room-temperature self-repairing polyurethane elastomer based on multiple dynamic reversible effects as well as preparation and application thereof. A preparation method comprises the following steps: 1) reacting a dihydric alcohol with a diisocyanate under the action of a catalyst to obtain a prepolymer; wherein the dihydric alcohol is a mixture of more than one from a polyether glycol and a polysiloxane glycol; 2) reacting a dicarboxylic acid chain extender with the prepolymer toobtain an oligomer; adding a diamine chain extender, continuously reacting, and carrying out subsequent treatment to obtain polyurethane; wherein the dicarboxylic acid chain extender and the diamine chain extender are collectively called as chain extenders, and the chain extenders contain disulfide bonds and pyridine groups; 3) in an organic solvent, reacting polyurethane with a metal salt cross-linking agent, and removing the solvent to obtain the high-strength room-temperature self-repairing polyurethane elastomer. The preparation method is simple and mild in condition, and the prepared polyurethane elastomer is excellent in mechanical property and high in self-repairing efficiency and is applied to a flexible substrate materials, wearable equipment and intelligent protective coating.

The invention provides a preparation method of solvent-free environment-friendly polyurethane automobile leather. The automobile leather comprises a surface layer and a foaming layer, wherein both the surface layer and the foaming layer are made of double-component solvent-free polyurethane; each of solvent-free environment-friendly polyurethane surface layer rein and solvent-free environment-friendly polyurethane foaming layer resin respectively used in the surface layer and the foaming layer is composed of a solvent hydroxyl mixture component A and an isocyanate component B. The specific preparation method of the automobile leather comprises the following steps: blade coating a shell fabric, drying the shell fabric, blade coating the foaming layer resin, adhering base cloth when the foaming layer resin is half-dry, curing and rolling. The automobile leather is prepared from the solvent-free environment-friendly polyurethane resin by one-step molding on a dry-method production line; the preparation method gets rid of a wet-method process flow in the traditional production process of polyurethane automobile leather and the production procedure is shortened for one half; no organic solvent is discharged, and the production process and finished products are friendly to the environment.

The invention discloses an electrolyte for a Li-S battery. The electrolyte mainly comprises electrolyte salts and an organic solvent, wherein the electrolyte salts contain lithium polysulfide, and the molecular formula of the lithium polysulfide is Li2Sn. A preparation method of the electrolyte comprises the following steps of adding lithium metal or Li2Sn and elemental sulfur into the organic solvent according to a molar ratio and carrying out reaction at room temperature and under the protection of an inert atmosphere to generate the electrolyte, wherein lithium salts, shuttle inhibitors and the like can be selectively added to the electrolyte. The invention further discloses a Li-S battery containing the electrolyte; a negative active material is the lithium metal or lithium-containing alloy; a positive active material is at least one of the elemental sulfur, organic sulfides and carbon-sulfur polymer, and the positive pole is composed of the positive active material, a conductive agent and a binding agent which are mixed in a certain mass ratio; and the dosage of the electrolyte is about 0.04 mL relative to every milligram of sulfur. The Li-S battery disclosed by the invention has the advantages that the sources of raw materials are broad, the energy density of the Li-S battery can be increased, and the cycle life of the Li-S battery can be prolonged.

A silicon-containing film is formed from a heat curable composition comprising (A-1) a silicon-containing compound obtained by effecting hydrolytic condensation of a hydrolyzable silicon compound in the presence of an acid catalyst and removing the acid catalyst, (A-2) a silicon-containing compound obtained by effecting hydrolytic condensation of a hydrolyzable silicon compound in the presence of a basic catalyst and removing the basic catalyst, (B) a hydroxide or organic acid salt of lithium, sodium, potassium, rubidium or cesium, or a sulfonium, iodonium or ammonium compound, (C) an organic acid, and (D) an organic solvent. The silicon-containing film allows an overlying photoresist film to be patterned effectively.

Provided are a leave-on hair cosmetic composition, containing the following components (A), (B) and (C): (A) an organic dicarboxylic acid or salt thereof, (B) an organic solvent selected from aromatic alcohols, N-alkylpyrrolidones, alkylene carbonates, polypropylene glycols having a number average molecular weight of from 100 to 1000, lactones and cyclic ketones, and

(C) an organopolysiloxane having an organopolysiloxane segment and a poly(N-acylalkyleneimine) segment having a recurring unit represented by the following formula (1):

(wherein, R¹:H, C_1-22 alkyl, cycloalkyl, aralkyl or aryl, and n: 2 or 3), wherein the latter segment has been bonded to at least one silicon atom of the former segment via a hetero-atom-containing alkylene group; having the organopolysiloxane segment and the poly(N-acylalkyleneimine)segment at a weight ratio of from 98/2 to 40/60; and having a weight average molecular weight of from 50,000 to 500,000; and a hair treating method with the composition.

The hair cosmetic composition of the invention can essentially improve the hair quality, give excellent luster, manageability, setting property to the hair, and also give excellent flexible hair feel and elasticity.

A modular process for organosolv fractionation of lignocellulosic feedstocks into component parts and further processing of said component parts into at least fuel-grade ethanol and four classes of lignin derivatives. The modular process comprises a first processing module configured for physico-chemically digesting lignocellulosic feedstocks with an organic solvent thereby producing a cellulosic solids fraction and a liquid fraction, a second processing module configured for producing at least a fuel-grade ethanol and a first class of novel lignin derivatives from the cellulosic solids fraction, a third processing module configured for separating a second class and a third class of lignin derivatives from the liquid fraction and further processing the liquid fraction to produce a distillate and a stillage, a fourth processing module configured for separating a fourth class of lignin derivatives from the stillage and further processing the stillage to produce a sugar syrup.

The invention relates to an ultraviolet-curable high temperature resistant pressure-sensitive adhesive. The ultraviolet-curable high temperature resistant pressure-sensitive adhesive comprises: a solvent-free ultraviolet-curable prepolymer comprising 80-98wt% of a soft monomer and 2-20wt% of a hard monomer; one or more functional monomers comprising monofunctional monomers, bifunctional monomers or multi-functional monomers; one or more organosilicone having reactive groups or acrylates grafted by the organosilicone having reactive groups; and photoinitiators comprising a free radical cracking type photoinitiator, a hydride abstraction type photoinitiator and an ion type photoinitiator. The whole preparation process of the pressure-sensitive adhesive does not use any volatile organic solvents and is environmentally-friendly; a pressure-sensitive adhesive tape using the pressure-sensitive adhesive has a good high temperature shear resistance, has a high peeling strength on low-surface-energy materials, has a one-piece structure, and can be processed to prepare thick products without inner liner base materials.

An inkjet recording method includes using ink for inkjet recording containing a hydrodispersible colorant, a surfactant, water, and an organic solvent containing a polyol, an amide compound represented by the following Formula I, and an oxetane compound represented by the following Formula II; using a recording medium having a particular transfer amount of highly deionized water as measured by an automatic scanning absorptometer; and forming an image on the recording medium with the ink, wherein the ink has a particular wettability, where γ′ represents dynamic surface tension as measured by maximum bubble pressure technique and θ represents a contact angle,

The invention discloses a graphite type carbon nitride-metal organic frame composite photocatalyst as well as a preparation method and application of the graphite type carbon nitride-metal organic frame composite photocatalyst. Graphite type carbon nitride acts as a carrier of the graphite type carbon nitride-metal organic frame composite photocatalyst; metal organic framework particles freely grow on the surface of graphite type carbon nitride, and the surfaces of the metal organic framework particles are loaded with carbon nitride nano sheets. The preparation method comprises the following steps: carrying out ultrasonic dispersion on graphite type carbon nitride into dimethylformamide so as to obtain a graphite type carbon nitride dispersion solution; stirring and mixing a carbon nitride dispersion solution, tetrabutyl titanate, methyl alcohol and an organic solvent so as to obtain a mixed solution; heating and reacting the mixed solution in a seal environment so as to obtain the graphite type carbon nitride-metal organic frame composite photocatalyst. The graphite type carbon nitride-metal organic frame composite photocatalyst can remove dye in waste water, and has the advantages of simplicity, high efficiency, environment friendliness, economic property, environment protection and the like.

The present invention provides for methods of preparing silk nanoparticles and microparticles, methods of encapsulating an active agent into the silk nano- and microparticles and compositions comprising these silk particles. In particular, the silk spheres are prepared from phase separation of silk and polyvinyl alcohol (PVA), without exposure to an organic solvent. The method employs a chemical, PVA, which is an FDA-approved ingredient in drug formulations. Different parameters can be adjusted to control the size and shape of the silk spheres during the fabrication process. The silk particle compositions of the present invention may also encapsulate active agents or chemicals. Such compositions allow the active agents to be controllably and sustainably released to the target organs or tissues. The silk composition entrapping active agents also provides for a long-term storage medium for the active agents so entrapped. The silk nano- and microparticles of the present invention are thus suitable for a variety of biomedical and pharmaceutical applications, such as drug delivery or tissue engineering.

The invention provides a stainless steel degreasing agent, which comprises the following components in percentage by weight: 5 to 25 percent of organic solvent, 2 to 5 percent of corrosion inhibitor, 10 to 25 percent of surfactant, 5 to 10 percent of inorganic salt, 1 to 3 percent of defoaming agent and the balance of deionized water, wherein the organic solvent is bromohydrocarbon; the corrosion inhibitor is sodium benzoate, ammonium benzoate, triethanolamine, ethanolamine or benzotriazole; the surfactant is one or more of alkylphenol polyoxyethylene ether and fatty alcohol-polyoxyethylene ether; the inorganic salt is alkaline salt; and the defoaming agent is tributyl phosphate, organic silicon, oleic acid or sodium oleate. The stainless steel degreasing agent can replace the currently used ODS cleaning agents, can achieve the cleaning effect of the ODS cleaning agents, does not damage the surface of the stainless steel, has obvious cleaning effect, can clean a large number of products, and does not harm a human body; and the preparation method is simple, safe, and environment-friendly.

The invention relates to a preparation method of a tissue repair material. The preparation method comprises the following steps: carrying out pre-treatment; vibrating in an organic solvent to degrease; deactivating a virus with an ethanol solution; removing cells by high and low osmotic solutions; swelling in an acidic or alkaline liquid; and quickly lyophilizing and sterilizing. The thickness of the tissue repair material is increased by 2-4 times, and the material is loose and porous, small in change of mechanical property and degradation property and good in cell removal effect and has relatively high biosafety and biocompatibility. Due to the structural characteristics of proper thickness and looseness and porosity, the material is suitable for damage repair for filling damaged parts required by repair such as cartilage injury, skin and soft tissue defect, gingival recession and the like. Animal experiments verify that the repaired region after eight weeks has no depressed phenomena and is fully replaced by regenerated tissues. Moreover, the regenerated tissue and autologous tissue are healed well and are free of separating phenomenon, which verifies that the material can provide sufficient three-dimensional space for cell proliferation and crawl, so that the repaired region has good integration degree and filling degree, thereby realizing tissue repair and regeneration.

The invention relates to a preparation method of a graphene-like MoS2/graphene combined electrode of a lithium ion battery. The preparation method comprises the following steps of: dispersing oxidized graphene ultrasonically in deionized water, stirring, and firstly adding a cationic surfactant; then adding L-aminothiopropionic acid and sodium molybdate sequentially; transferring the obtained mixed dispersing system to a hydrothermal reaction kettle, and reacting at 220-250 DEG C for 24 hours, then cooling naturally, collecting solid products centrifugally, washing with the deionized water, drying, and carrying out heat treatment in a nitrogen/hydrogen mixed atmosphere, thereby obtaining a graphene-like MoS2 and graphene combined nano material of single layer or 2-4 layers on average; and mixing the graphene-like MoS2 and graphene combined nano material and acetylene black as well as polyvinylidene fluoride into paste, and coating the paste on a copper foil and rolling, thereby obtaining the electrode. The preparation method provided by the invention is simple in process, and organic solvents are not required to be consumed; the lithium ion battery combined electrode has the advantages of high electrochemistry lithium storage specific capacity, stable circulating performance, and good high-multiplying-power charging and discharging performance.

A method for forming a water-repellent film on a solid substrate. The method includes: preparing a mixed solution of a silane coupling agent (A) including reactive functional groups at both ends and a hydrocarbon chain and a benzene ring in the middle part; a silane coupling agent (B) including a fluorocarbon chain at one end and a reactive functional group at another end; and a chemical material including at least an organic solvent, water and acid catalyst; allowing hydrolysis and dehydration polymerization reaction of the silane coupling agents (A) and (B) to proceed; diluting the solution; applying the solution to the substrate and heating the substrate, thereby forming a polymer film of the silane coupling agent (A) and the silane coupling agent (B). Thus, there is provided a method for producing an alkali resistant water-repellent film at low cost.

The invention relates to the technical field of preparation of aqueous adhesive and discloses a preparation method of acrylic ester oligomer chemical modified aqueous polyurethane pressure-sensitive adhesive. The preparation method comprises the following steps of: making hydroxyl monomers, a hydrophilic chain extender and polyisocyanate which are mainly used as man raw materials react to generate a prepolymer; adding an acrylic ester oligomer and making the acrylic ester oligomer and polyurethane prepolymer properly grafted; carrying out multiple modification through a cross-linking agent; and finally, carrying out water emulsification to obtain the acrylic ester oligomer modified aqueous polyurethane pressure-sensitive adhesive. In the invention, the acrylic ester oligomer is introducedinto the polyurethane system, and good characteristics of aqueous polyurethane and polyacrylic ester are integrated. Compared with solvent-based pressure-sensitive adhesive, water is used as a solvent in the invention, the usage amount of organic solvents is small so that the requirement of clean production processes are met, and the low temperature resistance is greatly improved. The synthesizedacrylic ester oligomer chemical modified aqueous polyurethane pressure-sensitive adhesive has more excellent mechanical property, strong bonding capacity, good film forming property and stable emulsion.

The invention discloses a preparation method of an epoxy resin system for a nanometer modified carbon fiber prepreg. The preparation method comprises the following steps: uniformly mixing a nanometer material with solid particles including a curing agent, an accelerant and the like in liquid bis-phenol A epoxy resin by a grinding method of a three-roller grinder to prepare a mixture A; and preparing the epoxy resin system for the carbon fiber prepreg by using the mixture A as the material to melt and co-extrude with solid bis-phenol A epoxy resin under 40 DEG C-100 DEG C. Firstly, the nanometer material is uniformly pre-mixed in the liquid epoxy resin by the grinding method of the three-roller grinder, and then secondary dispersion is carried out. According to the preparation method of the epoxy resin system for the nanometer modified carbon fiber prepreg disclosed by the invention, not only can the use of an volatile organic solvent be avoided, but also the better dispersion effect of the nanometer material in an epoxy resin base body can be achieved, and therefore, the process is relatively environment-friendly, and the harms to the body of a worker are smaller. Moreover, the nanometer material is good in dispersion effect, simple in process, high in efficiency and convenient for being applied to modifying and preparing the epoxy resin system for the carbon fiber prepreg in a large scale.

The present invention provides a process for preparing cross-linked sodium hyaluronate microspheres capable of being adopted as an emboliaztion agent by adopting sodium hyaluronate as a raw material. The process comprises the following steps: preparing a sodium hyaluronate alkaline solution gel with a concentration of 10-30% g/ml; adding the sodium hyaluronate alkaline solution gel to an emulsifier-containing oil phase, and carrying out high speed emulsification through a shearing machine, wherein an emulsification speed is 500-2000 rpm, and a time is 10-20 min; adding a certain amount of a cross-linking agent, stirring for 4-6 h at a room temperature, carrying out a cross-linking reaction, and standing overnight after completing the reaction, wherein a mass percentage of the cross-linking agent in the oil phase is 0.2-2%; and adopting a water-soluble organic solvent to wash to remove the oil phase remained on the surface of the microspheres, and finally drying to obtain the cross-linked sodium hyaluronate microspheres. According to the present invention, the preparation process is simple; and the size of the obtained microspheres is suitable for routine blood vessel emboliaztion, and the obtained microspheres have characteristics of controllable particle size, good microsphere shape, easy screening, elasticity, expandibility, no toxic-side effect on human body, good biocompatibility, good biodegradability, and ensured clinical safety.

The invention relates to a high-voltage insulator surface electrified cleaning agent which comprises the following components in percentage by weight: 75-85% of detergent builder, 5-10% of nonionic surfactant, 1-5% of penetrating agent, 0.5-10% of organic solvent and 0.5-1% of protective agent, wherein the detergent builder is trichlorotrifluoroethane, and the protective agent is silicone oil. The cleaning agent has small surface tension, strong foul cleaning capacity on a high-voltage insulator, good permeability, insulation performance, high-voltage resistance, and good stability, is easy to volatilize and not easy to burn and non-toxic.

The invention relates to a preparation method of high solid content waterborne polyurethane. The waterborne polyurethane is higher than common organic solvent in latent heat of evaporation, and water solvent type polyurethane in waterborne polyurethane of the same solid content is slow in solvent evaporation and needs long drying time. The preparation method comprises the steps of mixing polymer polyol with polyisocyanates under the protection of nitrogen, stirring evenly and then adding catalyst for reacting; adding a hydrophilic chain extender for reacting; cooling, adding a solvent and a neutralizer so as to obtain a prepolymer and stirring at high speed so as to disperse in deionized water; adding the chain extender, stirring, reducing pressure and removing the solvent through steaming so as to obtain the waterborne polyurethane emulsion; and preparing the prepolymer of different size distribution, dispersing in the waterborne polyurethane emulsion along with velocity mixing, and stirring for 1-4 hours. The waterborne polyurethane emulsion has wide size distribution and low viscosity, is stable, and can solve the key technical problems of high latent of evaporation, slow volatilization, long drying time, low production efficiency and the like in the field of research of the waterborne polyurethane.

The invention discloses a preparation method of a lignin nanoparticle and belongs to the chemical field of nanometer materials. The preparation method comprises the following steps of: dissolving a lignin raw material through an organic solvent; removing impurities; dropwise adding a proper amount of inorganic acid into filtrate to form lignin colloid; adding a cross-linking agent to perform cross-linking reaction with the lignin colloid; and adding water and stirring to dialyze to form lots of lignin nanoparticles of which the particle size is between 20nm to 200nm. The prepared lignin nanoparticle is excellent in dispersing performance and absorbing performance, and is expected to be applied to dispersing agents for wastewater treatment, dye, pesticide, water-coal-slurry systems and the like. The preparation method, disclosed by the invention, is simple and feasible; all the adopted solutions can be recovered, no adverse impacts are brought to the environment, and good application prospect is provided.

The invention relates to cuprous oxide nano hollow spheres and a synthetic method thereof. The synthetic method comprises the following steps of: (1) dissolving a cupric salt in an organic solvent, and controlling the copper ion concentration at 0.01-0.6mol/L; (2) transferring the solution obtained in the step (1) into a reaction vessel, sealing the reaction vessel, putting the reaction vessel into a reaction environment in which the temperature is 120-200 DEG C, performing thermal reaction for 0.5-8 hours, and cooling the reaction vessel naturally; (3) separating the solid obtained in the step (2), washing and drying to obtain the cuprous oxide nano hollow spheres. According to the synthetic method, the cuprous oxide nano hollow spheres are prepared through a one-pot hydrothermal synthesis under the condition that any surfactant is not added; the prepared nano spheres with unique hollow structures have excellent dye adsorption capacity and lithium ion battery performance.

The invention aims at providing electrolyte containing functional additives and taking propylene carbonate as the main solvent, and a secondarily liquid injected lithium ion battery comprising the electrolyte taking propylene carbonate as the main solvent. In the invention, the electrolyte comprises nonaqueous organic solvent, electrolyte salt and additives; the nonaqueous organic solvent comprises a main component propylene carbonate, wherein the propylene carbonate is 50%-10% of the total mass of the electrolyte; the electrolyte salt is lithium salt; the concentration of the lithium salt is 2.5-4.0 mol/L; the additives comprise general film-forming additives; the secondarily liquid injected lithium ion battery comprises cathode, anode, diaphragm and the electrolyte taking the propylene carbonate as the main solvent. Through using the secondary liquid injection method, the PC solvent is prevented from co-intercalation, therefore the primary efficiency of the battery is clearly promoted, and the normal temperature cycle performance and the low temperature discharging performance of the battery are improved.

The invention discloses a single-component moisture-curing polyurethane adhesive and a preparation method thereof. The preparation method of the adhesive is characterized by comprising the following step: by adopting an organic solvent as a solvent, performing reaction on polyether glycol and/or polyester glycol, diphenyl methane diisocyanate, polymethylene polyphenyl isocyanate and triatomic primary alcohol of which the molecular weight is less than 200 to prepare the adhesive. The average degree of functionality of an obtained high-functionality NCO-terminated prepolymer is more than or equal to 3, and the single-component moisture-curing polyurethane adhesive disclosed by the invention is suitable for splicing and tenoning (or assembling) of woods and bonding and compounding of stone materials, fireproof plates, plastic aluminum plates, bakelite plates, oak boards, some metals such as aluminum and iron, zinc-plating plates, PVC membranes and the like, is especially suitable for adhesion of rosewoods and red woods, and can meet the special requirements of some products.

The present invention discloses an anti-sagging spraying primer coat, which comprises, by weight, 10-25% of a two functionality aliphatic polyurethane acrylate, 20-30% of a modified epoxy acrylate, 10-20% of a polyester acrylate, 10-15% of a monomer, 25-30% of a filler, 3-5% of a photoinitiator, 0.5-2% of an anti-sagging additive, 0.2-0.5% of an anti-foaming agent, and 0.1-0.3% of a leveling agent. With application of the UV paint as the spraying primer coat, the problem of sagging during a coating process can be avoided, the whole coating efficiency can be improved, the environment-friendly characteristic is provided, and the organic solvent emission can be reduced.

The present invention discloses an extraction method for high purity rubusoside. The extraction method comprises the following steps: (1) pre-treatment: removing impurities from a dried sweet tea raw material, and smashing, sieving and obtaining the dried sweet tea raw material to sweet tea raw material powder; (2) microwave counter-current extraction: performing microwave counter-current extraction on the sweet tea raw material, extruding extracted residues, and mixing and filtering an extruding liquid and a sweet tea feed liquid to obtain an extracting liquid; (3) performing centrifugation to obtain centrifugate; (4) macroporous resin adsorptive separation: adjusting the pH value of the centrifugate to 10.0-11.0, passing the centrifugate through macroporous resin for adsorption, and after leaving the centrifugate to stand, performing water-washing and eluting to collect a target eluent; (5) performing ultra-filtration to obtain ultrafiltrate; (6) performing concentration to obtain a concentrate; and (7) crystallization and recrystallization: adding an organic solvent into the concentrate for crystallization, then performing recrystallization and drying to obtain a rubusoside product. According to the rubusoside product obtained by the method provided by the invention, the purity is greater than or equal to 99%, and the yield is greater than or equal to 5.35%. The extraction method provided by the present invention is simple and convenient in process, short in period, low in energy consumption and production cost and can be used for continuous extraction, and is suitable for continuous production in a factory.

The invention discloses a baicalin metal complex of which the molecular formula is (C21H17O11) xM (H2O) y, wherein M in the formula is Cu (II), x is 1 and y is 2; or M is Fe (III), x is 2 and y is 0; or M is La (III) or Y (III), x is 3 and y is 0. The preparation method comprises the following steps: adding aqueous alkali into baicalin until the baicalin and alkali (sodium bicarbonate, potassium bicarbonate, sodium formate, potassium formate, sodium acetate, potassium acetate, disodium hydrogen phosphate, dipotassium hydrogen phosphate, sodium phosphate or potassium phosphate) are just completely reacted, then adding metal salt (copper salt, ferric salt, lanthanum salt or yttrium salt) for reaction to obtain the baicalin metal complex. The baicalin metal complex has obviously stronger antibacterial and antitumor activities than the baicalin, can be used for preparing antibacterial drugs and antitumor drugs, and has good development and application prospects. In the preparation method, an organic solvent is not used, a strong basic condition is not adopted, and the method is simple and feasible, is green and environment-friendly and has the advantages of low cost, high product purity and high yield.