202 results about "Volatile solvents" patented technology

The invention relates to the technical field of waste gas separation, and discloses a low-energy-consumption recovery method and system for organic waste gas, and the method comprises the steps: analyzing the volatile solvent component concentration, concentration fluctuation data, solvent recovery energy consumption correlation factors and temperature and humidity data of the organic waste gas through multi-source coupling, and obtaining a characteristic coupling feature set; analyzing key process conditions of waste gas separation based on the feature set feed-forward situation to obtain optimal energy consumption operation parameters; the parameters and conditions of the waste gas separation process are optimized in combination with the parameters and feature set dynamic constraint, and a Pareto optimal scheme is obtained; selecting a scheme as an optimal control strategy according to separation efficiency dynamic characteristics and energy consumption stability key factors in the feature set; the digital twinning collaborative deduction control strategy and feature set is coded into a separation control instruction; based on recovery energy efficiency verification and product quality detection indexes after actual operation, performing feedback optimization to obtain a low-energy-consumption instruction generation strategy; the low-energy-consumption recovery efficiency of the organic waste gas can be improved.

The invention discloses a tooth whitening gel and a preparation method thereof. The tooth whitening gel comprises the following components in percentage by mass: 5%-25% of a film-forming agent, 0.1%-15% of peroxide, 0.1%-15% of a regulator and 45%-94.8% of a volatile solvent, the film-forming agent is modified ethyl cellulose, and the preparation method comprises the step of treating ethyl cellulose by adopting one or more of irradiation, illumination, oxidation, heating, mechanical pulverization and grinding to obtain the modified ethyl cellulose. The preparation method of the tooth whitening gel comprises the step of uniformly mixing the raw materials including the film-forming agent, the peroxide, the regulator and the volatile solvent to obtain the tooth whitening gel. The tooth whitening gel provided by the invention can be ensured not to be dissolved by saliva after being smeared on teeth, and can be ensured to be completely removed when being removed.

The invention discloses a polyarylene ether nitrile nanofiber membrane and a preparation method of the polyarylene ether nitrile nanofiber membrane through double-solvent synergistic electrostatic spinning, and relates to the field of high polymer material preparation. The method comprises the following steps: preparing two electrostatic spinning solutions with obvious volatilization rate and dissolution parameter difference, and alternately depositing two types of fibers on a collecting surface by adopting dual-channel synergistic electrostatic spinning; in the deposition and drying process, chain segments at fiber cross points are induced to swell, mutually diffuse and cure in situ to form bonding points by utilizing the poor evaporation rate of a high / low volatile solvent and the poor solvent-polymer compatibility, so that the self-densification and the structure stabilization of the nanofiber membrane are realized. The obtained nanofiber membrane has high-density in-situ bonding points and remarkably improved mechanical properties, does not need additional post-treatment such as hot pressing or solvent spraying, and is suitable for application such as interlayer reinforcement and interface toughening of composite materials. The process has continuity and controllability, and the density and mechanical properties of the membrane body can be customized by adjusting a solvent system and spinning parameters.

There is provided a composition for topical application to the penis for the treatment of erectile dysfunction, the composition being free of glyceryl trinitrate (GTN), sildenafil and an acetylcholinesterase inhibitor, and comprising volatile and non-volatile solvents, the volatile solvents comprising a lower alcohol and water and the non-volatile solvents comprising a polyhydric alcohol and a glycol. Preferably, the composition does not contain any pharmaceutically active ingredients for the treatment of erectile dysfunction. Also provided is a method of determining the cooling ability of a test composition, such as the composition described above.

The application provides a method for inkjet printing of oligonucleotides, and belongs to the technical field of in-situ synthesis of oligonucleotides.The method comprises the following steps: modifying the surface of a solid carrier with a chemically active functional group; depositing oligonucleotide synthesis reagents onto the surface of the modified solid carrier by inkjet to perform in-situ synthesis; and the solvent in the oligonucleotide synthesis reagents comprises one or two of glutaronitrile, acetonitrile and propylene carbonate.The application uses a new type of difficult-to-vaporize solvent, greatly reduces the volatilization of reagents during inkjet synthesis and the generation of organic vapors during synthesis, and thus maintains a high in-situ synthesis reaction efficiency of oligonucleotides.

The present invention relates to a compacted powder comprising at least: a) an oily phase in an amount of at least 10% by weight relative to the total weight of the composition, said oily phase comprising at least one non-volatile oil; and b) a powdered phase in an amount of at least 40% by weight relative to the total weight of the composition, said powdered phase comprising at least: i) perlite; and ii) at least one spherical filler selected from the group consisting of mineral fillers, organic fillers of natural origin, and mixtures thereof; and iii) at least one particulate colorant; and c) at least one amorphous hydrocarbon-based block copolymer; and d) at least one pigment; the composition is free of talc particles or mica particles in free form and is obtainable via a process comprising the steps of: 1) mixing the oil phase, the amorphous hydrocarbon-based block copolymer, the powdered phase and at least one volatile solvent to form a slurry; and 2) injecting the slurry into a container and shaping it by compaction, in particular pressing and / or suction.

The invention discloses a polyester polymer microsphere containing hyaluronic acid (sodium) and a preparation method of the polyester polymer microsphere, the hyaluronic acid (sodium) is dispersed in a microsphere body, and the hyaluronic acid (sodium) accounts for 2-20% of the weight of the polyester polymer microsphere. The preparation method of the microspheres comprises the following steps: dispersing hyaluronic acid (sodium) in a polyester polymer solution in a non-solution form to obtain a polyester polymer solution in which hyaluronic acid (sodium) is dispersed; the step of dispersing the hyaluronic acid (sodium) in the non-solution form is that the hyaluronic acid (sodium) is dispersed in the form of solid particles or a solid particle suspension; in the polyester polymer solution, the solvent for dissolving the polyester polymer is a volatile solvent. The microspheres provided by the invention can wrap hyaluronic acid (sodium) with higher content, and have better stability.

The invention discloses a coating preparation method capable of regulating and controlling the morphology of a coating. The coating preparation method is used for spraying on an instrument. A drug solution used in the preparation method of the coating comprises at least one solvent, a drug active ingredient and an excipient in a preset proportion are added into the solvent, when only one solvent is used, the solvent is a polar and high-volatility solvent A, stirring and ultrasonic oscillation are carried out at room temperature so as to uniformly dissolve the solvent A, and the drug solution is obtained, when the medicine solution is sprayed, the spraying flow and the moving speed of a spray head are adjusted through external spraying equipment according to a preset standard so as to spray at least one layer of medicine solution on an external instrument, and therefore the preset coating morphology is formed on the surface of the instrument through the medicine. The method has the advantages that the microstructure of the coating can be controlled to improve the stability of the coating; therefore, the release effect of the medicine is ensured, and the release behavior and the tissue retention time of the medicine in various lumen stenosis diseases can meet the delivery requirements required by clinical treatment.

The invention discloses a polyurethane antifouling paint and a preparation method thereof, and belongs to the field of paints.The preparation method comprises the steps that cardanol and formaldehyde are subjected to polycondensation to form a cardanol aldehyde prepolymer, then the cardanol aldehyde prepolymer, polyether polyol and isophorone are mixed and react, and cardanol modified polyurethane is obtained; and mixing a volatile solvent, a flatting agent, nano silicon dioxide, perfluoropolyether oil and cardanol modified polyurethane to obtain the polyurethane antifouling paint. The cardanol structure is introduced, so that the film-forming property of the coating can be improved, active sites can be provided for subsequent polyurethane modification, the cohesion of the coating is enhanced to a certain extent, and the coating is more wear-resistant by matching with the nano silicon dioxide; the cardanol modified polyurethane combines the advantages of cardanol, polyether polyol and isophorone diisocyanate, and perfluoropolyether oil has extremely low surface energy, and can effectively inhibit the adhesion of marine organisms and play an antifouling role under the combined action of the perfluoropolyether oil and other components.

The utility model discloses a safe paint spraying and drying integrated device which comprises a processing box, a paint spraying device and a drying device. The processing assembly comprises a paint spraying unit and a heating unit, the paint spraying unit comprises a spray head, and the heating unit comprises an infrared lamp; the storage frame assembly comprises a translation frame, a translation unit, an overturning unit and a driving unit, and the overturning unit comprises two overturning shells and a bidirectional air pump; and the circulating filtering assembly is used for extracting gas in the processing box, filtering the gas and then returning the gas to the processing box. According to the safe paint spraying and drying integrated device, air in the processing box is continuously extracted for filtering through the circulating filtering assembly, moisture and harmful volatile solvents in the air are filtered out, then the air is returned to the processing box, cleanliness of the internal environment of the processing box is guaranteed, the processing quality and the processing efficiency are improved advantageously, accumulation of harmful substances is avoided, and the safe paint spraying and drying integrated device is suitable for popularization and application. And harmful substances are prevented from volatilizing to the outside after the box door is opened to cause environmental pollution and harm the health of workers, so that safe processing and production are realized.

The application discloses a kind of based on enhanced raman's trace furfural in oil ultrafast detection method and system, the method includes: preparation regular arrangement metal nanometer finger array on flexible polymer substrate;After depositing dielectric film on the surface of metal nanometer finger, introduce removable sacrificial layer, under the condition with temperature gradient, volatile solvent is applied, adjacent metal nanometer finger gradually approaches contact, metal-dielectric-metal gap structure is formed, so that the enhanced substrate of hotspot uniform distribution is obtained;Transformer oil sample is directly dropped on the surface of the enhanced substrate;Using Raman spectrum system, enhanced raman signal of furfural molecule in the oil sample is collected under laser excitation;According to the enhanced raman signal, the characteristic peak of furfural in transformer oil is identified.The application can realize in-situ, high-sensitivity, rapid, non-destructive detection of trace furfural in transformer oil without extraction and adsorption.

Provided is a substrate treating apparatus including a treating module, in which the treating module includes: a polishing treatment unit for polishing a substrate with a polishing pad; a cleaning treatment unit for cleaning the substrate by supplying a treatment liquid to the substrate; and a transfer chamber in which a transfer robot transferring the substrate is placed, a liquid treating chamber is provided in the cleaning treatment unit, the liquid treating chamber includes: a support unit for supporting and rotating the substrate; a treatment liquid supply nozzle for supplying a treatment liquid containing a polymer and a volatile solvent onto the substrate; a first removal liquid supply nozzle for supplying a first removal liquid onto the substrate; and a second removal liquid supply nozzle for supplying a second removal liquid onto the substrate.

This application relates to the field of solar cell technology, and more particularly to a perovskite solar cell and its fabrication method, as well as a photovoltaic module. The fabrication method of the perovskite solar cell includes: a first carrier transport layer disposed on a surface of a conductive substrate; forming a perovskite thin film by depositing a perovskite precursor solution on the surface of the first carrier transport layer; during the film formation process, a protective gas is introduced into the environment, the gas flow of which forms an acute angle with the surface of the first carrier transport layer. This protective gas protects the environmental atmosphere during the perovskite thin film fabrication process, accelerates the evaporation of volatile solvents, reduces organic solvent residue, and forms a continuous and uniformly thick large-area perovskite thin film, thereby improving the photoelectric conversion efficiency and stability of the perovskite solar cell device and promoting the industrialization of perovskite solar cells.

The application discloses a film-forming easy-to-remove low-irritation tooth whitening gel and a preparation method thereof. The film-forming easy-to-remove low-irritation tooth whitening gel comprises 1-30% of a film-forming agent, 1-15% of a plasticizer, 0.1-15% of a peroxide, 0.1-15% of a regulator and 40-95% of a volatile solvent in percentage by mass. The preparation method comprises the following steps: uniformly mixing raw materials including the film-forming agent, the plasticizer, the peroxide, the regulator and the volatile solvent to obtain the film-forming easy-to-remove low-irritation tooth whitening gel. The tooth whitening gel has better film-forming property, lower irritation, better safety in use, better whitening effect and better removal after use, and does not use a carboxyl group as an adhesion group by jointly matching the film-forming agent and the plasticizer.

The invention discloses a method for directly preparing a racemic oxidation product from a fennerenone enantiomer through photocatalysis, and belongs to the technical field of organic synthesis.The method comprises the steps that an R-type fennerenone isomer is taken to be placed in a reaction bottle, a photosensitizer containing iridium or ruthenium is added, and a solvent is added at the speed of 0.1 M in the air atmosphere; the method comprises the following steps: dissolving 4-(4-cyano-2-methoxyphenyl)-5-ethoxy-2, 8-dimethyl-1, 6-naphthyridine-3-formamide in a solvent, stirring, transferring a mixture into a photoreactor of a blue light LED (Light Emitting Diode) with the wavelength of 455-465 nm, stirring, transferring a mixed solution after the reaction is finished into a round-bottom flask, purifying a volatile solvent to obtain a product 4-(4-cyano-2-methoxyphenyl)-5-ethoxy-2, 8-dimethyl-1, 6-naphthyridine-3-formamide, and carrying out chiral HPLC (High Performance Liquid Chromatography) analysis on the product. High temperature, high pressure or a strong oxidant is not needed, and reaction conditions are mild; oxygen in air is oxidized at room temperature, so that energy consumption and pollutant generation are reduced; compared with the traditional oxidation condition, the method does not need to undergo the process of oxidation first and then high-temperature induced racemization, and the racemization product can be directly obtained.

Methods disclosed herein relate to generating silk nanoparticles with a low polydispersity index (PDI). Methods include adding a silk solution dropwise into a volatile solvent that is miscible with water, thereby forming a precipitate-bearing solution and applying shear forces to the precipitate-bearing solution for a length of time sufficient to achieve evaporation of at least 95% of the volatile solvent, thereby producing a population of silk fibroin nanoparticles in water having a polydispersity index (PDI) of 0.35 or less, including but not limited to, a PDI of 0.330 or less, 0.325 or less, 0.315 or less, 0.310 or less, 0.30 or less, 0.275 or less, 0.250 or less, 0.225 or less, or 0.200 or less. Parameters related to silk fibroin molecular weight, silk fibroin concentration, shear force application, and temperature may all be modified to achieve silk nanoparticles of a particular size exhibiting particular PDIs.

The present invention relates to an anhydrous cosmetic composition comprising, in a physiologically acceptable medium: (i) at least one alkyl cellulose, preferably ethyl cellulose, (ii) at least one film-forming polyurethane polymer, and (iii) at least one non-aqueous polar volatile solvent selected from C1-C5 lower monoalcohols and volatile hydrocarbon oils, the volatile hydrocarbon oil is selected from the group consisting of optionally hydroxylated esters, ethers, dialkoxymethane, carbonates, and mixtures thereof.

The application relates to airtight powder container, comprising an outer cover, an inner cover, an inner sieve and a base, the inner sieve is airtightly installed at the opening end of the base and is located between the inner cover and the base, the inner cover and the inner sieve are hinged through a hinge unit, the hinge unit is elastic so that the inner cover can move towards the inner sieve side when being forced, when the outer cover is covered on the base, the outer cover extrudes the inner cover so that the inner cover is tightly combined with the inner sieve. In the application, the inner cover and the inner sieve are hinged with each other, the inner cover and the inner sieve can be tightly combined together under the extrusion force of the outer cover, the airtightness of the inner sieve is guaranteed, and the volatile solvent in the cosmetic material in the base is effectively prevented from being volatilized.

The invention provides an asphalt cold-patch liquid and a preparation method thereof, and the asphalt cold-patch liquid comprises the following components in parts by mass: 100 parts of asphalt, 10-30 parts of resin containing unsaturated C = C double bonds, 20-50 parts of a long-chain unsaturated fatty acid compound and 1-2 parts of a photoinitiator, wherein the long-chain unsaturated fatty acid compound is selected from unsaturated fatty acid of which the carbon chain length is not less than C16 or ester derivatives thereof. The asphalt cold supplementing liquid abandons a traditional volatile solvent, emission of VOCs is eradicated fundamentally, and the asphalt cold supplementing liquid has excellent environment-friendly safety; long-chain unsaturated fatty acid contained in the asphalt can form a lubricating molecular film on the surfaces of asphalt particles, so that excellent flowability and construction convenience at normal temperature are guaranteed; unsaturated double bonds in the material can be subjected to rapid photopolymerization reaction under natural illumination to form a cross-linked network structure, so that intelligent curing from flowing state to high strength is realized. Through the mechanism, rapid forming can be achieved at the room temperature, the maintenance time is greatly shortened, and the maintenance efficiency is remarkably improved.

The invention provides a preparation method of a DIC nano speckle used on the surface of a heterogeneous material, which comprises the following steps: (1) mixing and dispersing nano particles and a volatile solvent to obtain a nano particle dispersion liquid; (2) preparing a conductive layer on the surface of the cross section of the to-be-detected sample; (3) providing an electrified droplet deposition device which comprises a high-voltage power supply module, a nozzle and a sample table, and the high-voltage power supply module comprises a positive high-voltage power supply module and a negative high-voltage power supply module; placing a to-be-tested sample on a sample table; and (4) connecting the positive high-voltage power supply module with a nozzle, connecting the negative high-voltage power supply module with a sample table, spraying the nano-particle dispersion liquid onto the conductive layer of the sample to be detected, and drying to obtain the DIC nano speckle. The preparation method provided by the invention effectively solves the problem of non-uniform distribution of nano speckles caused by inconsistent adhesion force of nano particles to the surfaces of different materials in the prior art.

Title: COSMETIC COMPOSITION COMPRISING A PARTICULAR POLYESTER, AT LEAST ONE VOLATILE SOLVENT AND AN UNMODIFIED HECTORITE TYPE FILLER AND METHOD USING IT The present invention relates to a cosmetic composition, in particular for making up human keratin materials, in particular the skin and / or the lips, preferably the lips, comprising:- at least one natural resin,- at least one polyester which is the reaction product of the following components (i), (ii) and (iii): (i) at least one polyglycerol-3 (ii) at least one dimer acid, and (iii) at least one fatty monoacid having from 8 to 30 carbon atoms, the reacted components (i), (ii) and (iii) being in a molar ratio of 1 mole of polyglycerol-3, from 0.5 to 1 mole of dimer acid and from 0.1 to less than 2.0 moles of fatty monoacid,- at least one volatile solvent, - optionally at least one non-volatile hydrocarbon oil, - at least one unmodified hectorite type filler.It also relates to a method of treatment, in particular of makeup, of human keratin materials, in which this composition is applied to said keratin materials.

The invention relates to a light-triggered slow-release sterilization type perfume composition and a preparation method thereof, and belongs to the technical field of perfume. The light-triggered slow-release bactericidal perfume composition comprises the following components in percentage by mass: 0.1-0.3 wt% of fullerene subjected to surface modification, the fullerene is subjected to surface modification treatment through a surface modifier in advance, and the surface modifier is selected from at least one of polyvinylpyrrolidone and hydroxypropyl-beta-cyclodextrin; the toothpaste comprises the following components in percentage by weight: 2.5-3.5% of glycyrrhiza glabra extract, 10-15% of essence and 0.1-0.5% of a pH regulator, and is used for regulating the pH of a system to 5.5-6.5; the solvent comprises a main volatile solvent, a polar solvent and water. The invention further discloses a preparation method of the perfume. The fullerene and the glycyrrhiza glabra extract are applied to a perfume formula, so that the perfume is endowed with a sterilization function, and the requirements of modern consumers on multifunctional personal care products are met.

This invention discloses a devolatilization process for high melt flow index and high transparency lithium-based polymer solutions. The process employs falling film evaporation for initial evaporation, followed by deep devolatilization using a twin-screw extruder, with the volatile solvent being condensed and recovered. The devolatilized polymer melt is then extruded by a screw extruder, pelletized by an underwater pelletizer, and dehydrated by a centrifugal dewatering machine to obtain finished polymer granules. This method can be used for the devolatilization of high melt flow index, high transparency, and low water content lithium-based polymer solutions, and the resulting polymer volatile content is ≤0.5% (mass fraction). The granules or cobblestone-like particles are easy for downstream processing applications. This process is simple, low-cost, can be manufactured using existing mature equipment and processes, and is easy to control and industrialize.

The invention discloses porous polycaprolactone microspheres as well as a preparation method and application thereof. The preparation method of the porous polycaprolactone microspheres comprises the following steps: S1, respectively preparing a water phase solution and an oil phase solution; s2, mixing the water phase solution and the oil phase solution in the step S1 by using a micro-fluidic method, and collecting micro-droplets flowing out in a micro-fluidic manner; and S3, carrying out solvent volatilization treatment on the microfluidic effluent liquid obtained in the step S2 to obtain the porous polycaprolactone microspheres. The method comprises the following steps: controlling the number-average molecular weight of polycaprolactone in an oil-phase solution to be within a specific range, adding a pore-foaming agent and a compatibilizer into the oil-phase solution, and then mixing the oil-phase solution and a water-phase solution according to a certain flow velocity by adopting a microfluidic technology to prepare the porous polycaprolactone microspheres. The polycaprolactone microspheres not only have a smaller particle size distribution range and a higher pore-forming rate (up to 85% and above), but also have higher uniformity of porosity. In addition, the preparation method is easy and convenient to operate, parameters are controllable, and the method can be used for industrial large-scale production.

The invention relates to the technical field of nano materials, and discloses a nano-silver paste material and a preparation method thereof, and the nano-silver paste material comprises composite silver powder, an organic solvent system and a polyvinylpyrrolidone surface modifier. Wherein the composite silver powder is composed of nano silver wires, polygonal nano silver particles and micron-sized flaky silver powder according to a specific mass ratio, the organic solvent system is a gradient volatile solvent, and the polyvinylpyrrolidone surface modifier forms a thin coating layer. By the adoption of the technical scheme, low sintering shrinkage, high sintering compactness, low void ratio, excellent electric and heat conduction performance and high shear strength can be achieved.

To provide a production method for efficiently obtaining a concentrated liquid in which a volatile component is concentrated.SOLUTION: The production method of the present invention includes an introduction step of introducing a gas phase containing a volatile component into a liquid phase composed of a hardly volatile or nonvolatile solvent. As a result, a concentrated liquid in which the volatile component is dissolved in the solvent is obtained. The production method of the present invention is carried out, for example, using a production apparatus including a container (11) for containing a liquid phase composed of a solvent (s), an air supply pipe (22) for guiding a gas phase containing a volatile component to the liquid phase, an exhaust pipe (32) for guiding the gas phase that has passed through the liquid phase to the outside of the container, and a pneumatic means (31) for circulating the gas phase from the air supply pipe to the exhaust pipe. When air bubbles are generated during the introduction step, a defoaming means (13) may be provided between the air supply pipe and the exhaust pipe.SELECTED DRAWING: Figure 1A

The application discloses a PBT car lamp electroplating primer with anti-color fading performance and a preparation method and application thereof. The components of the primer include 20-30 parts of a cyclic structure polyol modified difunctional polyurethane acrylate resin, 8-15 parts of a ten-functional polyurethane acrylate resin, 5-10 parts of a phenolic aldehyde epoxy acrylate resin, 2-6 parts of a difunctional polycarbonate polyurethane acrylate resin, 3-6 parts of pentaerythritol triacrylate, 5-10 parts of trimethylolpropane triacrylate, 2-3 parts of 184, 0.5-1 part of 819, 0.5-1 part of TPO, 0.1-0.2 part of an organic silicon leveling agent and 23-35 parts of an organic solvent. During preparation, the resin components are first mixed and dispersed at high speed to obtain a mixed resin, then 184, 819 and TPO and the leveling agent are dissolved in part of butyl acetate and stirred, ethyl acetate, ethylene glycol monobutyl ether and the remaining butyl acetate are added, and after dispersion, the primer is filtered to obtain the primer. The primer solves the problems of deep curing, adhesion and leveling of the PBT car lamp primer by accurately matching 184, 819 and TPO, selecting a cyclic structure modified polyurethane acrylate resin and gradient volatile solvents.

Systems and methods for recycling polymers. A method for recycling synthetic polymers by combining the polymers with a solid depolymerizing catalyst in a vessel, mechanically shearing the combined polymers and the solid depolymerizing catalyst against each other to produce monomers from the polymers; and collecting the monomers. The solid depolymerizing catalyst can be solid sodium hydroxide. Collecting the monomers can be achieved by contacting the sheared polymer and catalyst with a recyclable volatile solvent to dissolve the monomers. The method can include purifying the collected monomers for repolymerization. Purifying the monomers can be achieved using nanofiltration membrane technology, cyclic fixed bed adsorption, simulated moving-bed adsorption or a combination thereof.

The invention provides a preparation method of a waterborne polyurethane emulsion without a volatile solvent, and belongs to the technical field of material preparation. The preparation method comprises the following steps: taking polyether glycol, hexamethylene diisocyanate and 2, 2-dimethylolpropionic acid (DMPA) as raw materials, taking dibutyltin dilaurate as a catalyst, carrying out one-pot polymerization in a specific reaction medium triethyl citrate, and carrying out pH regulation and emulsification to obtain the stable waterborne polyurethane emulsion. The prepared emulsion can form a transparent polyurethane material with good mechanical properties after being dried, the boiling point of triethyl citrate exceeds 250 DEG C, and the transparent polyurethane material has good stability in daily life. According to the preparation method of the waterborne polyurethane, no volatile solvent exists in the whole process, the adopted functional components are safe in source, the treatment process is simple and convenient, and a thought can be provided for development of synthesis of a green solvent-free waterborne polyurethane solution so as to meet the requirement of green sustainable development.

The application provides a closed film forming method of a slotted flux-cored wire, a seamless flux-cored wire and a preparation device thereof and application of the preparation device, and belongs to the technical field of flux-cored wire preparation.The closed film forming method of the slotted flux-cored wire provided by the application comprises the following steps: after the slotted flux-cored wire is infiltrated with RK-305 weldable closed rust-proof oil and dried, a kind of seamless flux-cored wire is obtained; the RK-305 weldable closed rust-proof oil comprises rust inhibitor TVCI-115-8%, closed film forming agent TVCI-103-8%, penetrant 2-5% and volatile solvent 79-90% by mass percentage.In the application, the RK-305 weldable closed rust-proof oil can penetrate into the joint of the slotted flux-cored wire, and after drying, a hydrophobic closed rust-proof film is formed by solidification, the joint is effectively closed, the powder leakage problem of the slotted flux-cored wire is solved, and the thermal stability, moisture resistance and rust resistance are improved.