477 results about "Co solvent" patented technology

The invention belongs to the technical field of PET (Polyethylene Terephthalate) recovery, and particularly relates to a method for assisting methanol alcoholysis of waste PET by using an ester solvent. The method comprises the following steps: by taking waste PET as a raw material, methanol as a solvent and an ester solvent as a cosolvent, catalyzing and depolymerizing the waste PET under the action of an organic strong alkali catalyst to obtain an alcoholysis product, and further separating and purifying the alcoholysis product to obtain DMT and high-value byproducts. The method is mild in reaction condition and rapid in reaction process, the catalyst does not contain metal, and the subsequent purification process can be simplified.

The invention provides a preparation method of a UTSA-16 structure metal organic framework, which comprises the following steps: sequentially adding a metal salt and potassium citrate into an auxiliary solvent, adding an alkaline solution, dissolving, and treating in a ball milling manner to obtain a reaction solution; centrifuging the reaction liquid, collecting a solid part, washing with diethyl ether, soaking with methanol, and drying to obtain a precursor; and activating the precursor at the temperature of 80-90 DEG C, and removing the solvent in the pore channels to obtain the metal organic framework with the UTSA-16 structure. According to the invention, the UTSA-16 is prepared by a solvent-assisted ball milling method, the problems of high energy consumption, long time and serious pollution in the previous preparation process of the UTSA-16 are solved, and the UTSA-16 can be formed under a milder condition and within a shorter time by the method; the reaction is carried out in a ball mill, the maximum synthesis amount can be enlarged along with the scale of the ball mill, the reaction takes 3 hours, heating is not needed, and the method can be put into factories for large-scale production.

The invention discloses a fine circuit pattern anti-diffusion agent as well as a preparation method and a use method thereof, and relates to the technical field of printed circuit board manufacturing. The fine circuit pattern anti-diffusion agent is prepared from the following components in percentage by mass: 0.05 to 0.3 percent of an oleophobic agent, 0.1 to 0.6 percent of a bonding agent, 0.2 to 1.5 percent of an adhesion promoter, 0.5 to 4.0 percent of a wetting agent, 0.5 to 5.0 percent of a cosolvent and the balance of water, the oleophobic agent is a fluorophenylethylamine derivative, the bonding agent is a carbonyl chloride derivative, the adhesion promoter is a sulfur heterocyclic alkane derivative, the wetting agent is a methylsiloxane silane derivative, and the cosolvent is a sulfonyl ketone derivative. According to the fine circuit pattern anti-diffusion agent, an organic layer can be formed on the copper surface of a circuit board, the binding force between the copper surface and printing ink is enhanced, jet printing printing ink is prevented from diffusing on the copper surface, and the product percent of pass of a jet printing solder mask process is improved.

The invention provides high-compactness meta-aramid paper and a preparation method and application thereof, and the preparation method comprises the following steps: (1) mixing an organic solvent, an adhesive and a cosolvent to obtain a mixed solution; (2) soaking meta-aramid paper in the mixed solution for the first time, then soaking the meta-aramid paper in deionized water for the second time, and then drying and hot-pressing the meta-aramid paper to obtain the high-compactness meta-aramid paper. The preparation method comprises the following steps: soaking meta-aramid paper in a mixed solution containing an organic solvent, an adhesive and a cosolvent to swell the surfaces of aramid chopped fibers and partially dissolve fibrids, and then soaking the meta-aramid paper in deionized water to remove the organic solvent, so that the swelled / dissolved fibers are partially fused to obtain the meta-aramid paper. And carrying out hot pressing to obtain the meta-aramid paper with high compactness, high insulation and excellent mechanical properties.

The invention provides a method for alcoholysis of polyethylene glycol terephthalate, and relates to the technical field of PET degradation. The PET alcoholysis method provided by the invention comprises the following steps: mixing PET, ethylene glycol, a cosolvent and a composite catalyst, and carrying out alcoholysis reaction to obtain bis (hydroxyethyl) terephthalate (BHET). According to the invention, dimethyl sulfoxide is taken as a cosolvent, zinc acetate and 1, 8-diazabicyclo [5.4. 0] undec-7-ene are taken as a composite catalyst, catalysis and solvent effect driving are combined, and ethylene glycol alcoholysis of PET is carried out under the synergistic effect of the composite catalyst and the cosolvent. According to the method, effective decomposition of PET can be achieved at the low temperature (140-155 DEG C) and within the short reaction time (60-100 min), and the yield of BHET is high (66% or above and can reach 80% or above). The method provided by the invention can realize high-efficiency alcoholysis of PET with ethylene glycol.

The invention discloses a kind of high-efficiency and environment-friendly developer for PCB board, and the developer includes the following components by mass: 60-100 parts of organic alkali composition; 30-80 parts of cosolvent; 30-70 parts of defoamer; 40-70 parts of surfactant; 20-50 parts of antioxidant; 15-45 parts of penetrant; 30-50 parts of buffer; 10-20 parts of inhibitor; The invention also discloses a preparation process of high-efficiency and environment-friendly developer for PCB board. The present invention develops PCB board by using organic alkali composition, fully dissolves dry film by ether group, hydroxyl group and amine group, avoids solid precipitation caused by traditional carbonate development, thereby effectively improving the efficiency and quality of PCB development process; penetrant and cosolvent are added at the same time, significantly improving the penetration and dissolution effect of developer on dry film, further improving development efficiency; and with the antioxidant, buffer etc. added therein, the antioxidant capacity of developer and PCB board can be improved, and the stability of developer during use is ensured.

The invention discloses a high-temperature-resistant sealing agent and a preparation method thereof, and relates to the technical field of chemical assistants, and the high-temperature-resistant sealing agent is characterized by comprising the following components in parts by weight: 25-32 parts of acidic nano silica sol, 56-65 parts of a cosolvent, 8-12 parts of a hydrolysis inhibitor, 9-12 parts of a silane coupling agent A, 5.5-6.8 parts of a silane coupling agent B and 0.01-0.015 part of a wetting agent. The high-temperature-resistant sealing agent has the effects that the high-temperature-resistant sealing agent is not yellowed, decomposed and dropped after being baked for 2 hours in an oven at the temperature of 250 DEG C, and is not corroded after being corroded by salt mist for 1000 hours.

The present invention relates to the field of plastic films, and in particular to an agricultural plastic film and a preparation method thereof. The agricultural plastic film is composed of the following components in parts by mass: 95-105 parts of film particles, 2-4 parts of modified nano-titanium dioxide emulsion, 6-10 parts of lignin nanoparticles, 2-4 parts of tannic acid, 6-10 parts of glycerol, 4-6 parts of maleic anhydride-grafted polycaprolactone as a co-solvent, and 4-6 parts of cellulose nanocrystals. Compared with the prior art, the present invention achieves comprehensive improvement in material degradability, anti-aging performance and processing efficiency, while taking into account production cost optimization and process adaptability. The agricultural plastic film can be widely used in agricultural scenarios such as greenhouse covering and soil moisture retention, has significant advantages in reducing environmental pollution and improving the comprehensive performance of agricultural films, and has broad application prospects.

The invention relates to solvent wiping resistant UV ink and a preparation method thereof, and belongs to the technical field of ink. The UV ink is prepared from the following components: 15 to 20 weight percent of pigment, 1.9 to 2.4 weight percent of photoinitiator, 5.5 to 7.2 weight percent of organic silicon additive, 1.5 to 2 weight percent of wetting dispersant, 1.2 to 1.6 weight percent of flatting agent, 1 to 1.3 weight percent of defoaming agent, 1.4 to 1.8 weight percent of covering agent, 16 to 22 weight percent of cosolvent and the balance of acrylate binder, the organosilicon auxiliary agent contains multiple silicon chains, quaternary ammonium structure in-situ modification reduces interfacial tension between the silicon chains and an acrylate matrix and facilitates migration and spreading of the silicon chains to the surface of the ink layer, and the quaternary ammonium structure promotes photocuring crosslinking of acrylate, so that a silicon-rich high-crosslinking protective layer is formed on the surface of the ink layer, and swelling and friction loss of a solvent are effectively resisted.

The embodiment of the invention provides a paint remover and a preparation method thereof. The paint remover comprises the following raw materials: an alcohol solvent, an ester solvent, an activator, a cosolvent, a corrosion inhibitor, a surfactant, a cosurfactant and deionized water. The paint remover is environment-friendly, does not need special temperature conditions in the preparation and use processes, and has high efficiency, stability, safety and universality.

The invention discloses a neutral organic chelating cleaning agent for a boiler, and belongs to the field of chemical cleaning of boiler superheaters of thermal power plants. The cleaning agent is prepared from the following components in percentage by weight: 0.5%-5% of ethylenediamine tetraacetic acid ammonium, 0.1%-4% of acetic acid or ammonium acetate, 0.1%-3% of glycollic acid ammonium or glycollic acid, 0.1%-5% of a pH regulator, 0.1%-1% of a cosolvent, 0.2%-0.8% of a corrosion inhibitor SH369, 0.1%-0.6% of a reducing agent, 0.0%-0.3% of a defoaming agent, 0.0%-0.2% of a surfactant and 84%-93% of water, wherein the pH value of the cleaning agent is 6-8; the cosolvent is tartaric acid and / or hydroxybutyl diacid, the surfactant is nonylphenol polyoxyethylene ether, and the reducing agent is hydrazine. The cleaning agent disclosed by the invention has good dissolving capacity on oxide skin, does not generate precipitates to cause pipe blockage, is a neutral solution, is very small in corrosivity, does not generate intergranular corrosion, is beneficial to protecting various pipes of superheaters and reheaters, and is a safe and efficient superheater cleaning agent.

The invention discloses a method for preparing 5-hydroxymethylfurfural by rapidly converting high-concentration biomass derived sugar, and belongs to the field of biomass catalytic conversion. The method comprises the following steps: mixing biomass derived sugar with a deep eutectic solvent, and carrying out closed reaction to obtain 5-hydroxymethylfurfural; the eutectic solvent comprises benzyl quaternary ammonium salt, organic acid and a cosolvent, and the organic acid is benzenesulfonic acid or organic dicarboxylic acid with 2-5 carbon atoms; the molar ratio of the benzyl quaternary ammonium salt to the organic acid to the cosolvent is (1-3): (0.5-1.5): (0-5); the concentration of the biomass derived sugar is 5 to 50 weight percent. The benzyl quaternary ammonium salt with a benzene ring is used as a hydrogen bond acceptor, the organic acid and the cosolvent are used as hydrogen bond donors to form the eutectic solvent, and a hydrogen bond network and an acid environment around the biomass derived sugar can be properly regulated and controlled by adjusting the proportion of the benzyl quaternary ammonium salt, the organic acid and the cosolvent, so that high-substrate sugar is efficiently and quickly converted into 5-hydroxymethylfurfural.

The invention discloses a cationic polymer acid-resistant thickening agent as well as a preparation method and application thereof, and belongs to the technical field of oil-gas field development. The polymer thickening agent is prepared from the following components in percentage by mass: 65 to 85 weight percent of acrylamide, 15 to 35 weight percent of methacryloyloxyethyl trimethyl ammonium chloride, 0.01 to 0.05 weight percent of dicationic functional monomer and 1 to 8 weight percent of cosolvent, the acid liquor system comprises the following components in percentage by mass: 5wt%-30wt% of solid acid, 0.01 wt%-0.6 wt% of a cationic polymer acid-resistant thickener, 0.5 wt%-5.0 wt% of a corrosion inhibitor, 0.3 wt%-1.0 wt% of an iron ion stabilizer and the balance of water; wherein the solid acid consists of 5wt%-15wt% of a solid metal catalyst and 85wt%-95wt% of solid particle acid; the acid liquid system has excellent slow release performance, is simple in formula, convenient to transport, low in cost and suitable for site construction, and has wide market prospects.

The invention belongs to the technical field of oilfield chemistry, and particularly provides an environment-friendly oil-phase-free clean nano-microsphere and a preparation method of the environment-friendly oil-phase-free clean nano-microsphere. The nano microsphere is prepared from the following raw materials: 60 to 90 parts of an oil-free phase solvent, 50 to 70 parts of acrylamide, 25 to 35 parts of an anionic unsaturated monomer, 9 to 15 parts of a functional monomer, 3 to 7 parts of a cosolvent, 1 to 2 parts of modified nano silicon dioxide, 0.2 to 0.4 part of an initiator, 0.005 to 0.02 part of a cross-linking agent and 300 to 400 parts of distilled water. The nano-microsphere disclosed by the invention is good in expansion performance, excellent in high temperature resistance and salt resistance, excellent in deep profile control and displacement capacity, free of an oil-phase solvent, environment-friendly and pollution-free, and important support is provided for green transformation of oilfield exploitation.

The present invention relates to a photovoltaic water-based soldering flux and a preparation method and application thereof, comprising the following raw materials in parts by weight: 1-5 parts of cosolvent, 0.1-3 parts of wetting agent, 0.1-3 parts of polyethylene glycol, 1-8 parts of activator microcapsules, 0.1-1 parts of antioxidant, and 100 parts of water; wherein the activator microcapsules include capsule cores and capsule materials wrapping the capsule cores, and the capsule cores are composite activators; wherein the composite activator is a composition of an organic acid and a protective agent; the organic acid is a composition of 3-hydroxy-2-naphthoic acid, oleic acid and methylsuccinic acid; the protective agent is a composition of trimethylsiloxane and a quaternary ammonium salt cationic fluorocarbon surfactant. The soldering flux of the present invention uses water as the main solvent, and the soldering flux is more suitable for the preparation of photovoltaic cell chip assemblies with a hot welding temperature of 150-230°C, and the soldering flux can continuously provide activity during welding.

The invention relates to the technical field of stoving varnish materials, and particularly discloses a scratch-resistant alkali-resistant stoving varnish material and a preparation method thereof, the scratch-resistant alkali-resistant stoving varnish material comprises the following raw materials by weight: 35-40 parts of aqueous acrylic resin, 15-20 parts of amino resin, 7-11 parts of a filler aid, 5-8 parts of a scratch-resistant alkali-based functional agent, 3-5 parts of a silane coupling agent KH560, 2-5 parts of a film-forming cosolvent, 2-5 parts of an adhesion promoter, 1-3 parts of a leveling agent, and 20-25 parts of deionized water. According to the scratch-resistant alkali-resistant baking varnish material, the waterborne acrylic resin, the amino resin, the silane coupling agent KH560, the film-forming cosolvent, the adhesion promoter and the flatting agent are used as functional additives, and meanwhile, the functional agent based on the scratch-resistant alkali and the filler additive are added to be blended and matched to achieve common synergism, so that the hardness and the adhesion of the obtained product are harmoniously improved, and the scratch-resistant alkali-resistant baking varnish material has the advantages of simple preparation process and low cost. The alkali-resistant and scratch-resistant stability effects are obvious.

The invention relates to a method for detecting residual solvent benzene in a ziprasidone hydrochloride bulk drug. According to the detection method, dimethyl sulfoxide is used as a diluent, a 2.8 mol / L potassium hydroxide solution is used as a cosolvent, and a dimethyl sulfoxide solution of high-concentration ziprasidone hydrochloride can be completely dissolved under a high-temperature heating condition, so that the sensitivity of benzene meets the requirement; and detecting the benzene in the ziprasidone hydrochloride bulk drug by using a gas chromatograph (GC-FID headspace sampling) connected with a hydrogen flame ionization detector. The detection method can be used for quantitatively detecting benzene higher than 0.4 ppm in ziprasidone hydrochloride bulk drugs. The method is high in sensitivity and practicability, and the detection process is simple and rapid.

The invention provides a preparation method of dicapryl carbonate, belongs to the field of preparation of dicapryl carbonate, and can solve the problems of unstable reaction system, low raw material conversion rate, low catalyst efficiency, poor phase contact effect, many side reactions, low product purity and poor quality in the existing preparation method of dicapryl carbonate. The preparation method of dicapryl carbonate comprises the following steps: fully mixing n-caprylic alcohol, a basic catalyst and a cosolvent, continuously dropwise adding low-grade dialkyl carbonate into the mixed solution for 5-10 hours through a liquid material distributor, carrying out ester exchange reaction, continuously extracting low-boiling-point substances, controlling the reflux quantity, and carrying out reduced pressure distillation to obtain the dicapryl carbonate. The method comprises the following steps: adding a cosolvent into a reaction solution, enabling the cosolvent with an initial addition amount to always exist in the reaction solution, after the reaction is finished, dealcoholizing by reduced pressure distillation, and removing impurities by washing to obtain a crude product of dioctyl carbonate, and rectifying to obtain a dioctyl carbonate product. The preparation method is high in raw material conversion rate and high in product yield, and the purity of the obtained product is gt; the content of impurities is low, and the method can be applied to preparation of cosmetics.

The invention relates to a preparation method of menbutone powder, the menbutone powder comprises menbutone, a cosolvent, a protective agent and a filler, and the preparation method is characterized by comprising the following steps: step 1, preparing the protective agent into a solution; 2, placing menbutone in a fluidized bed to boil the powder, and adding the solution prepared from the protective agent in the step 1; and step 3, taking out after drying, and uniformly mixing with the cosolvent and the filler. The menbutone powder obtained by the preparation method has the characteristics of high water solubility, high activity, high stability under the conditions of high temperature, high humidity or illumination, and difficult generation of impurities after long-term storage.

The invention provides a glass fiber impregnating compound pipeline cleaning agent which comprises the following components in percentage by weight: 20-60% of a main solvent, 20-60% of an auxiliary solvent, 10-30% of a solvent and the balance of water. 10-35% of an auxiliary solvent; 1-12% of an activator; 0.2 to 10% of a surfactant; 10 to 40 percent of water; wherein the main solvent is an ether solvent which has good solubility on epoxy resin and polyurethane in the impregnating compound; the auxiliary solvent is an ester solvent which has a good dissolving effect on polyunsaturated polyester and PVAc; and the cosolvent is an alkaline substance. By adopting the green water-based cleaning agent, dirt in a glass fiber impregnating compound pipeline can be quickly and thoroughly removed, and no substance harmful to human health and unfriendly to the environment is left.

The invention discloses a method for detecting the content of carbon black in master batch, which comprises the following steps: S1) weighing the master batch with the mass G into a reaction tube, adding methanol, a cosolvent and a catalyst, sealing, and heating for alcoholysis; s2) taking out the reaction tube, cooling to room temperature, opening a cover, pouring a solution in the reaction tube into filter paper with the mass of W0, flushing the reaction tube with ethanol, pouring the solution into the filter paper to completely transfer the solution, flushing filter residues with hot absolute ethanol, and drying the filter paper with the filter residues, wherein the mass of the dried filter paper and the filter residues is W1; s3) putting the dried filter paper with the filter residues into a crucible with the mass of W2, ashing, transferring the crucible into a muffle furnace, calcining, and weighing the mass of the crucible and the ash content as W3 after the weight is constant; and S4) calculating the carbon black content in the master batch according to the following formula: omega = (W1-W0) / G * 100%-(W3-W2) / G * 100%. According to the method, ash content in the detection result is removed, the accuracy is high, the test repeatability is good, the operation is simple, and the energy consumption in the detection process is low.

One example of a jettable antioxidant formulation is used for three-dimensional (3D) printing. The jettable antioxidant formulation includes an antioxidant blend; a surfactant, a dispersant, or a combination thereof; a water-soluble or water-miscible organic co-solvent; and water. The antioxidant blend consists of a primary antioxidant and a secondary antioxidant.

The invention provides a water-borne epoxy resin composite coating and a preparation method thereof, and the water-borne epoxy resin composite coating comprises the following components in parts by mass: 70-90 parts of a water-borne epoxy emulsion component A; 10-30 parts of a curing agent component B; wherein the component A of the waterborne epoxy emulsion is prepared from the following raw materials in parts by mass: 50 to 70 parts of self-emulsifying epoxy resin, 5 to 10 parts of hydrophilic modifier, 15 to 25 parts of pigment filler, 2 to 5 parts of dispersion stabilizer, 1 to 3 parts of cosolvent and 5 to 10 parts of deionized water. Self-emulsifying modification of resin molecules is realized by adopting nonionic polyether grafted self-emulsifying epoxy resin and matching with a hydrophilic modifier with a specific hydroxyl value, an emulsifier does not need to be added, and the viscosity of a coating system is reduced from the molecular level, so that the solid content of the component A of the waterborne epoxy emulsion is more than or equal to 70%, the viscosity is less than 200mPa. S, and the technical bottlenecks of high solid content and low viscosity are broken through; and the requirement for single-time thick coating construction is met, the construction efficiency is greatly improved, and construction period prolonging and cost increasing caused by multiple times of construction are avoided.

The invention discloses an environment-friendly paint remover and a preparation method thereof, the environment-friendly paint remover comprises the following raw materials in parts by weight: 10-50 parts of a main solvent, 5-20 parts of a cosolvent, 5-20 parts of a surfactant, 2-15 parts of an accelerant, 1-5 parts of a flocculating agent, 1-5 parts of a thixotropic agent and the balance of water, the surfactant is a combination of a Bola type fluorine-containing phosphate surfactant and any one or more of isooctyl alcohol polyoxyethylene ether monophosphate, fatty alcohol polyoxyethylene ether phosphate, alkyl phosphate, alkylphenol polyoxyethylene ether phosphate, long-chain fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether and fatty acid polyoxyethylene ester. The non-toxic, environment-friendly and efficient paint remover has the advantages that the defects that an existing paint remover is large in toxicity, high in volatilization speed, not easy to clean after paint removal due to the fact that the paint remover contains paraffin, affects recoating adhesive force, narrow in application environment and the like are overcome, and the non-toxic, environment-friendly and efficient paint remover which is non-toxic, environment-friendly and capable of being used in the environment of 5-70 DEG C is provided.

The invention relates to the technical field of protein modified fibers, and particularly discloses a functional protein composite cellulose fiber as well as a preparation method and application thereof. The invention relates to a preparation method of a functional protein composite cellulose fiber. The preparation method comprises the following steps: 1) uniformly mixing components including nano silicon dioxide coated zinc oxide particles and deionized water to prepare a ZnO / SiO2 mother solution; 2) uniformly mixing components including a cellulose raw material and a solvent to prepare a cellulose spinning solution; the solvent is composed of quaternary ammonium base and a cosolvent; 3, the ZnO / SiO2 mother solution and the cellulose spinning solution are taken and mixed, the mixture is injected into a coagulating bath to be coagulated and formed, and the functional protein composite cellulose fiber is obtained.The prepared functional protein composite cellulose fiber has the advantages of being low in ZnO / SiO2 wastage rate and good in compatibility and has the lasting deodorization, antibacterial and bacteriostatic functions.

A method of mitigation of persistent organic compounds absorbed on a sorbent, the method including extracting the persistent organic compounds from the sorbent with a supercritical carbon dioxide (scCO2) mixture comprising scCO2, a co-solvent, and an ion source, wherein a scCO2 to co-solvent ratio is between about 10,000:1 to 1:1, wherein a co-solvent to ion source ratio is between about 10:1 and about 1,000,000:1, and wherein the scCO2 mixture is at a pressure and a temperature, to provide an extractant containing the persistent organic compounds; and isolating the persistent organic compounds from the extractant for their reuse or end of life treatment. A composition for the mitigation of persistent organic compounds, the composition including a scCO2, an ion source, and a co-solvent, wherein a scCO2 to co-solvent ratio is between about 10,000:1 to 1:1, and wherein a co-solvent to ion source ratio is between about 10:1 and about 1,000,000:1.

This invention relates to compositions and methods for cleaning and peeling. This disclosure provides a composition for cleaning or peeling materials from a substrate. The composition includes a primary solvent and a co-solvent. The co-solvent includes one or more caprolactam-derived solvents.

A three-dimensional printing kit includes a substantially colorless fusing agent and a color assist agent. The fusing agent includes a liquid vehicle including water, a co-solvent, and an amino acid stabilizer. The fusing agent further includes an infrared (IR) absorbing pigment dispersion including an IR absorbing pigment present in an amount ranging from about 0.01 wt % active to about 1.6 wt % active, based on a total weight of the fusing agent. The color assist agent includes a liquid vehicle including water and a plasticizing co-solvent, and a dye dissolved in the liquid vehicle. Also disclosed is a method of making a colored 3D printed object.

The invention discloses a preparation method and application of a high-flux, high-interception and structure-controllable asymmetric ultrafiltration membrane, and belongs to the technical field of ultrafiltration membranes. The preparation method of the asymmetric ultrafiltration membrane comprises the following steps: mixing 20-30 parts by weight of an ethylene-vinyl acetate copolymer, 40-70 parts by weight of a good solvent, 4-20 parts by weight of a pore-foaming agent, 10-25 parts by weight of a cosolvent and 0-10 parts by weight of a plasticizer, heating and stirring, standing and defoaming to obtain a homogeneous membrane casting solution; coating a substrate with the membrane casting solution and then carrying out pre-evaporation treatment; and immersing the pre-evaporated material into a coagulating bath to carry out phase separation and solvent exchange for curing, and washing to obtain the ultrafiltration membrane. Effective preparation of the asymmetric ultrafiltration membrane with high flux, high interception and controllable structure is realized, and the preparation method is simple to operate, clear in process, high in practicability and beneficial to product industrialization.

The present invention relates to the technical field of battery component processing, and provides a Dyn hold cleaner for battery covers and a cleaning method. The cleaner is composed of components in the following mass percentages: 40% - 65% of a hydrocarbon solvent, 3% - 15% of an organic base, and 20% - 50% of a co-solvent. The hydrocarbon solvent is one of synthetic isoparaffins, dearomatized fluids, Fischer-Tropsch synthetic paraffins, isoparaffins, or refined C11. The organic base is one or more of monoethanolamine, triethanolamine, isopropanolamine, diethylene glycolamine, and 2-amino-2-methyl-1-propanol. The present invention can effectively remove various dirt such as stamping oil residues on the surface of the battery cover. After cleaning, there is no white spot residue on the cover surface, the cleaner does not corrode the workpiece, and there is no adverse effect on the appearance of the workpiece; the initial Dyn value after cleaning is greater than 54 mN / m, and the Dyn value remains undiminished after 15 days of storage. Fundamentally, the problem of Dyn attenuation on the surface of the workpiece during storage and turnover is solved.