48 results about "Miniemulsion" patented technology

The invention relates to the fields of polyelectrolyte, reversed-phase colloid dispersion systems, nanoreactors, nanocrystals and the like, in particular to zinc cadmium sulfide nanocrystals prepared by taking a polyelectrolyte complex as a nanoreactor and a preparation method of the zinc cadmium sulfide nanocrystals. Carrying out ultrasonic treatment on the anionic polyelectrolyte and a solvent to form a reversed-phase miniemulsion colloid, then adding a soluble salt solution containing target metal ions, and continuously carrying out ultrasonic treatment to obtain an anionic polyelectrolyte reversed-phase miniemulsion colloid containing the target metal ions; performing ultrasonic treatment on the cationic polyelectrolyte and the solvent to form a reversed-phase miniemulsion colloid; adding a soluble sulfide solution, and performing ultrasonic treatment to obtain sulfide-containing cationic polyelectrolyte reversed-phase miniemulsion colloid; and mixing the two reversed-phase miniemulsion colloids, carrying out high-pressure nanocrystallization, putting the obtained product into a high-pressure reaction kettle, transferring the high-pressure reaction kettle to a drying oven, carrying out solvent heat treatment to obtain zinc cadmium sulfide nanocrystals with the size of 2-5 nanometers, and uniformly distributing the nanocrystals in the polyelectrolyte complex.

The application provides a miniemulsion polymer, which is prepared by a miniemulsion polymerization method through controlling pre-emulsion droplet particle size by a high-pressure homogenizer, using specific auxiliary stabilizers and specific primary emulsifiers. After the miniemulsion polymer is incorporated into a base material, an engineering material with high air tightness, high water tightness, high bonding strength and excellent durability can be obtained, which is used for the durability protection or sealing of engineering structures or the bonding between different materials, and has the advantages of simple process, low cost and outstanding comprehensive performance.

The preparation method of the agar nanogel interface modification spray is prepared from the following raw materials by weight: agarose 35-70 parts, Tween 80 40-50 parts, dimethyl silicone oil 60-150 parts, and tetrahydrofuran 50-120 parts. The preparation method comprises the following steps: S1: placing agarose into heated deionized water to obtain an agarose aqueous solution, adding Tween 80 and dimethyl silicone oil to obtain a coarse emulsion; S2: ultrasonic dissolving the coarse emulsion to obtain a fine emulsion, cooling and centrifuging, taking the lower liquid, adding tetrahydrofuran to obtain an agar nanogel mixture; S3: rotary evaporation and drying the mixture to obtain agar nanogel; and S4: adding the gel into ethanol or water to obtain the agar nanogel interface modification spray. The agar nanogel spray formed based on the molecular self-assembly strategy has a hexagonal phase columnar structure, the spray can form a modified layer with excellent light-heat conversion efficiency and water transport performance on the water surface, and can significantly enhance the evaporation efficiency.

The present application belongs to the technical field of compressed air energy storage power station engineering materials and underground engineering sealing, and specifically provides a composition containing a miniemulsion polymer emulsion for compressed air energy storage, the composition forms a closed gas storage space through sealing and / or filling, and more specifically, the polymer forms a flexible, air impermeable, dense and continuous sealing material or sealing layer between the same substrate or across substrates. The composition has excellent interfacial bonding capacity for different substrates, and can maintain continuous bonding and sealing when relative displacement occurs due to the difference in thermal expansion of different substrates. In addition, a continuous and dense barrier is formed after curing, which can simultaneously achieve "deep plugging + surface air tightness", thereby adapting to the sealing of underground scenes and key weak positions. Therefore, the composition of the present application has a wide application prospect in the field of sealing and filling of the gas storage space of compressed air energy storage.

The invention belongs to the technical field of high polymer materials, and particularly relates to a rubber label containing an epoxy group agglomerated siloxane microsphere emulsion and a preparation method thereof.The preparation method comprises the steps that S1, sodium dodecyl sulfate, sodium bicarbonate and sodium dihydrogen phosphate serve as raw materials to prepare a water phase, modified silane, n-hexadecane and azodiisobutyronitrile serve as raw materials to prepare an oil phase, and the oil phase is prepared into an oil phase; carrying out emulsification treatment on the water phase and the oil phase to obtain a miniemulsion, and carrying out polymerization reaction on the miniemulsion to obtain an epoxy group-containing agglomerated siloxane microsphere emulsion; s2, polyol, isocyanate, a chain extender, 1, 4-butanediol and stannous octoate are used as raw materials to prepare a prepolymer; and S3, adding the epoxy group-containing agglomerated siloxane microsphere emulsion into the prepolymer for stirring reaction, and then pouring into a mold for molding to obtain the rubber label containing the epoxy group-containing agglomerated siloxane microsphere emulsion. The hardness and heat resistance of the material are effectively improved, and good flame retardant property is obtained.

The invention herein disclosed refers to a method for preparation of glycerol nanocapsules (GNCs), adapted as an additive in a hydrophobic lubricant for improving lubricity in a tribological system, further to a glycerol nanocapsule (GNC) and finally to the respective use. The method comprises the steps of providing a continuous phase comprising at least a polyalphaolefin (PAO) and a dispersed phase comprising at least glycerol (GLY), of - mixing the continuous phase and the dispersed phase and performing high-pressure homogenization with a microfluidizer resulting in a minielmulsion comprising glycerol nanodroplets (GNPs). Further, adding a diisocyanate crosslinking agent (TDI) to the miniemulsion is comprised, leading to a polymerization reaction of the diisocyanate cross-linking agent (TDI) and glycerol (GLY) at the interfaces of the glycerol nanodroplets (GNPs) dispersed in the polyalphaolefin (PAO), resulting in formation of crosslinked glycerol-based polyurethan shells encapsulating a core of unreacted glycerol (GLY). Thereby glycerol nanocapsules (GNCs) are obtained, comprising a core of unreacted glycerol (GLY) encapsulated in a crosslinked glycerol-based polyurethan shell.

The invention belongs to the field of citral extraction, and discloses a preparation method of a citral solution, a citral miniemulsion and a preparation method of the citral miniemulsion. The preparation method of the citral solution comprises the following steps: preparing trifluoroacetaldehyde hemiethanol, 2-(trifluoromethoxy) ethanol, 2, 2-difluoroethanol and ethanol into a fluorine-alcohol mixed solution; taking the fluorine alcohol mixed solution, and adding alkanol to prepare a fluorine alcohol-alkanol solution; adding deionized water into the fluoroalcohol-alkanol solution, carrying out uniform vortex mixing, and carrying out centrifugal separation to obtain an MFHO-alkanol supramolecular solvent; uniformly mixing the MFHO-alkanol supramolecular solvent, deionized water and the citrus peel concentrate dilute solution in a vortex manner, and performing centrifugal separation to obtain a citral solution. The extraction method is simple, reliable and high in extraction efficiency.

The present invention relates to the fields of functional polymer synthesis, inverse colloids, etc. A method for phase inversion of imidazoline-based polymer Pickering fine emulsion is disclosed. First, a Pickering inverse fine emulsion stabilized by magnesium hydroxide nanocrystal precursors is prepared, and then a hydrothermal reaction is carried out to prepare a Pickering inverse fine emulsion stabilized by magnesium hydroxide nanocrystals. It is added to a reactor, an azoimidazoline-based salt initiator is added, ultrasonic biological crushing is carried out, and an acrylic monomer is added for reaction to complete the preparation of an imidazoline-based polymer that synergistically stabilizes the Pickering inverse fine emulsion with magnesium hydroxide nanocrystals. The Pickering inverse fine emulsion is stabilized with an imidazoline-based polymer-modified solid nanoparticle, and an inert gas is introduced to achieve the phase inversion of the Pickering inverse fine emulsion from water / oil type to oil / water type, or carbon dioxide is introduced again to achieve the phase inversion of the Pickering fine emulsion from oil / water type to water / oil type.

An aqueous dispersion along with methods for producing and uses for the same. Where the aqueous dispersion includes crosslinkable reactive silicone organic copolymers of ethylenically unsaturated monomers and of ethylenically functionalized silicone polymers and is obtainable by means of radically initiated miniemulsion polymerization in an aqueous medium.

The present invention provides a short-chain fluorinated polyacrylate three-proof finishing agent for cotton and a preparation method thereof. The method includes: dissolving a compounded emulsifier in deionized water, mixing fluorinated monomers and various acrylic monomers in proportion and then dropping them into the emulsifier aqueous solution to form a pre-emulsion under vigorous stirring; then performing ultrasonic dispersion through an ultrasonic cell disruptor under an ice bath to form a fine emulsified pre-emulsion, and subsequently transferring the fine emulsion into a three-necked flask. After slowly heating to the reaction temperature under an N2 atmosphere, an aqueous solution of an initiator is uniformly injected through a micro-injection pump to initiate the reaction. After the initiator is completely added dropwise, the reaction is continued while maintaining the temperature, and then the reaction is stopped and cooled to room temperature to obtain the short-chain fluorinated polyacrylate emulsion. The short-chain fluorinated polyacrylate three-proof finishing agent prepared by the present invention does not contain PFOS and PFOA, meets the environmental protection requirements, and has excellent water, oil and stain resistance properties.

The present invention relates to the fields of colloids, semiconductors, photocatalysis, battery electrodes, etc., and particularly relates to a method for preparing a hybrid of carbon nitride and nano-platinum by using a soft template. First, the preparation of Pickering fine emulsion of nano-platinum is realized by the soft template method; then, the re-dispersion and stabilization of the precursor in the Pickering inverse fine emulsion are completed by using the solubility of the carbon nitride precursor; after the emulsion is coated on a film, a hybrid of carbon nitride and nano-platinum is finally formed by heat treatment, and the size of the hybrid is about 100 nanometers and the distribution is uniform.

The invention belongs to the technical field of water-based resin synthesis, and particularly relates to a polyurethane / acrylate hybrid miniemulsion for water-based industrial paint and a preparation method of the polyurethane / acrylate hybrid miniemulsion. The preparation method comprises the following steps: S1, preparing low-viscosity water dispersible sulfonated phthalic anhydride polyester polyol; s2, preparation of a dipropenyl-terminated polyurethane miniemulsion: preparing the sulfonated phthalic anhydride polyester polyol prepared in the step S1 into a semitransparent miniemulsion of which the capsule core is an acrylate monomer droplet and the outer layer is a dipropenyl-terminated amphiphilic polyurethane block polymer dispersant; s3, preparation of polyurethane / acrylate hybrid miniemulsion: transferring the bispropenyl polyurethane miniemulsion prepared in the step S2 into a polymerization reaction device, and slowly heating to initiate free radical polymerization reaction to prepare the polyurethane / acrylate hybrid miniemulsion. The hybrid miniemulsion disclosed by the invention can meet the special grinding and dispersing requirements of water-based industrial paint manufacturing, and the production risk of unstable gel is avoided.

The invention discloses a photochromic fabric sensor and also discloses a preparation method of the sensor, and the preparation method comprises the following steps: preparing a spiropyran compound by using salicylaldehyde and indole; wrapping a spiropyrane compound by using a miniemulsion polymerization method to obtain a photochromic microcapsule dispersion liquid; after the photochromic microcapsule dispersion liquid is diluted, the fabric is soaked in the photochromic microcapsule dispersion liquid, and the photochromic fabric is obtained; the preparation method comprises the following steps: dehydrating polyether polyol, reacting the dehydrated polyether polyol with a hydrophilic monomer, an organic silicon modifier, an organic tin catalyst and diisocyanate to obtain a polyurethane prepolymer, and adding a chain extender and a neutralizer for continuous reaction to obtain an organic silicon modified polyurethane dispersion liquid; and mixing the organic silicon modified polyurethane dispersion liquid with a conductive material, and spraying the mixture on the surface of the photochromic fabric to obtain the photochromic fabric sensor. The preparation method is simple in process and low in cost, and the prepared sensor has the photochromic characteristic and excellent sensing performance.

The invention belongs to the technical field of food, medicine and cosmetic processing, and relates to a preparation method of electrostatic self-assembly high-load powdered oil, which comprises the following steps: mixing cellulose nanocrystal, soy protein isolate, water and algal oil to prepare a miniemulsion, and then heating in a water bath to obtain a precursor emulsion; adding type A gelatin into the precursor emulsion, and then adding an anion stabilizer to obtain an electrostatic self-assembly emulsion; and carrying out spray drying on the electrostatic self-assembled emulsion to obtain the high-oil-loading-capacity powdered oil. The packaging of electrostatic self-assembly is realized by using the type A gelatin and the anionic polymer, the utilization rate of the algal oil is improved, and the high-oil-loading powdered oil which is uniform in granularity, high in solubility and excellent in storage stability, thermal stability and oxidation stability is prepared by using a simple process with mild conditions.

The present application relates to the field of polymer synthesis, and discloses a copolymer emulsion, a preparation method and application thereof. The copolymer emulsion comprises a copolymer hydrogel, an organic solvent, an oil-soluble emulsifier and a water-soluble emulsifier, the average particle size of the copolymer hydrogel is 100-600 nm, the copolymer hydrogel comprises structural unit A, structural unit B and structural unit C, the copolymer emulsion has the characteristics of miniemulsion, is obtained by inverse emulsion polymerization of monomers, and the purity of monomer A is less than 99%; the copolymer emulsion can improve the flowability of crude oil when used for oil exploitation, thereby improving the recovery rate of crude oil.

The present application relates to the field of high-temperature-resistant film, co-doped nanocrystals and surface matrix material, and particularly relates to a polyimide matrix co-doped nanocrystal film and a preparation method thereof. A co-doped nanocrystal precursor modified reverse-phase fine emulsion is prepared first, and then a dispersion containing the co-doped nanocrystal precursor and polyamic acid is prepared; then, the dispersion containing the co-doped nanocrystal precursor and polyamic acid is spin-coated on a clean quartz glass sheet, and is placed in a replaceable air oven for drying to obtain a polymer matrix co-doped film; finally, after sintering and cooling, a polyimide matrix co-doped film is obtained. The thickness of the polyimide matrix co-doped film can be controlled within 80-500 nanometers, and the base film is flat; the co-doped nanocrystals are uniformly distributed in the form of nanodots on the matrix film; the film can be used at high temperature, the base film does not deform, and the co-doped nanodots have good adhesion.

The objective is to provide an emulsifier composition and an emulsifying composition that can easily prepare nanoemulsions with fine emulsion particles without going through heating and cooling processes, and without using high-energy equipment such as high-pressure homogenizers. [Solution] To solve the above problem, an emulsifier composition was prepared by combining (A) a polyglycerin fatty acid ester surfactant with an HLB value of 12 or more and 18 or less with (B) oleyl glyceryl ether or isostearyl glyceryl ether. Furthermore, an emulsifier composition with a particle size of less than 300 nm was obtained by mixing the oil phase containing the emulsifier composition with (G) an aqueous phase containing water.

To provide a method for producing polymer particles that enables production of a polymer having a narrow molecular weight distribution, even when the polymerization using a RAFT agent is conducted through miniemulsion polymerization without high-shear processing and without addition of an emulsification aid.SOLUTION: The present disclosure provides a method for producing polymer particles, comprising a polymerization step of dispersing a solution containing a radical-polymerizable monomer and an RAFT agent in an aqueous solution containing an emulsifier to prepare a miniemulsion, and subjecting the radical-polymerizable monomer to miniemulsion polymerization, wherein the amount of the RAFT agent is 0.20 mol or more relative to 100 mol of the total amount of the radical-polymerizable monomer, and the amount of the emulsifier is from 2.20 mol to 10.00 mol relative to 100 mol of the total amount of the radical-polymerizable monomer.SELECTED DRAWING: None

The invention discloses an up-conversion composite nanocrystal and a green preparation method thereof, a nanocapsule which takes a high polymer material as a shell and is internally coated with an up-conversion precursor solution is obtained by using a water-in-oil miniemulsion technology, and then the up-conversion composite nanocrystal material is obtained through solvent volatilization and confinement crystallization in the nanocapsule. According to the method, green preparation of the up-conversion nanocrystal under mild conditions is realized, the reaction temperature is 50 DEG C, all organic solvents can be recycled, a small amount of water is used as a volatile solvent, and high-corrosion chemicals are not involved. Meanwhile, the obtained up-conversion composite nanocrystal can obtain high quantum yield under low energy density, and the quantum yield can reach 15.5% under the energy density of 10 W cm <-2 >. The preparation method provided by the invention is suitable for preparing any composite nanocrystal of the rare earth doped upconversion material with high solubility.

The application relates to a method for preparing chitosan-hydroxyapatite composite microparticles through high-speed shearing and synergic double-reverse-phase fine emulsion, which continuously acts on the emulsification and homogenization process of the emulsification mixing of a chitosan-containing calcium salt and phosphate precursor aqueous solution and an oil phase system and a triethanolamine precursor aqueous solution and an oil phase system (constituting double-reverse-phase fine emulsion droplets) and the subsequent collision-mixing-neutralization-reaction process of chitosan, calcium salt and phosphate in the dispersed phase emulsion droplets (water droplets) and triethanolamine in another dispersed phase emulsion droplet (water droplet), realizes the continuous operation of the high-speed shearing effect reinforced physical emulsification mixing process and in-situ precipitation chemical reaction process, and achieves the purpose of preparing CS-HAP composite microparticles which are good in dispersity, not prone to agglomeration, closely combined with each other, high in porosity, uniformly dispersed and nano-level dispersed. The method is simple in preparation process, low in equipment requirement and cost, mild in reaction condition, easy to control in preparation process and easy to enlarge.

According to the calcium hydrophosphate dihydrate superfine powder synthesis process, firstly, PMMA / PAA nano particles with core-shell structures are prepared through miniemulsion polymerization, a shell layer forms a three-position space network structure through polymerization of an acrylic monomer and a cross-linking agent, the shell layer is of a porous structure, the shell layer is rich in carboxyl, calcium and phosphorus ions can be adsorbed on the surfaces of the PMMA / PAA nano particles, and therefore the calcium hydrophosphate dihydrate superfine powder is obtained. And further reacting to form calcium hydrophosphate dihydrate, and covering a layer of calcium hydrophosphate dihydrate on the surface of the PMMA / PAA nano particle to obtain the calcium hydrophosphate dihydrate superfine powder with the PMMA / PAA nano particle as a core layer and the calcium hydrophosphate dihydrate as a shell layer.

The application relates to the field of biological medicine, in particular to a fluorescently labeled hydroxypropyl-beta-cyclodextrin nanocapsule as well as a preparation method and application thereof. The nanocapsule is prepared from hydroxypropyl-beta-cyclodextrin through a reverse-phase miniemulsion polymerization method. The fluorescently labeled hydroxypropyl-beta-cyclodextrin nanocapsule provided by the application can load a hydrophobic antitumor drug, can stay at a tumor site for a long time, can release the antitumor drug, and has application prospects in tumor diagnosis and treatment integration.

The invention discloses a preparation and extraction detection method of a Fe3O4 (at) PS-TMG material, and the method comprises the following steps: S1, preparing a Fe3O4 magnetic fluid by adopting a coprecipitation method, and then drying the Fe3O4 magnetic fluid by using anhydrous Na2SO4 for later use; s2, a miniemulsion polymerization method is adopted to prepare Fe3O4 (at) Chloromethyl PS nano particles, and the Fe3O4 (at) Chloromethyl PS nano particles are prepared; s3, continuously adding tetrahydrofuran, TMG, Bu4NI and NaOH into the Fe3O4 and Chloromethyl PS nanoparticles according to the molar ratio of 1: 1: 1: 1: 1: 4, and carrying out reflux reaction under the protection action of nitrogen gas, wherein the molar ratio of the tetrahydrofuran to the TMG to the Bu4NI to the NaOH to the Fe3O4 and Chloromethyl PS nanoparticles is 1: 1: 1: 1: 4; and S4, after the reaction is finished, performing freeze drying to obtain the Fe3O4 coated PS-TMG material. The method provided by the invention has the advantages of high detection speed, high precision, high extraction rate, low material consumption, low loss, good reproducibility and the like, and has good economic benefits and application prospects in the aspect of pesticide residue detection.

This invention proposes a fluorine-free waterproof textile finishing agent and its preparation method, belonging to the field of textile auxiliaries technology. The method involves fine emulsion polymerization, using acrylate monomers as the core, and utilizing tetraethyl orthosilicate under alkaline conditions to form nano-SiO2 embedded on the surface of microspheres, constructing a micro-nano rough structure. Further modification with a compound of epoxy-containing silanes and hydrophobic silanes imparts a fully hydrophobic surface to the microspheres and enhances their reactivity with fabric fibers. The resulting finishing agent imparts excellent waterproof performance and superior wash fastness to textiles, and the process is simple, environmentally friendly, and fluorine-free, meeting the market demand for high-end functional textiles.

The invention discloses a polymer composite nano coating material which comprises the following components in parts by mass: 100 parts of fluorine-containing block A1, 42.86-100 parts of non-fluorine-containing block A2, 2.01-16.67 parts of high-conductivity filler B and 16.10-144.47 parts of fluorine modified high-dielectric filler C which are compounded by an in-situ miniemulsion polymerization method. A double-filler fluorine-containing polymer-based nano composite coating material three-phase system is prepared, and a high-dielectric and low-resistance nano composite material can be obtained.

The present invention discloses a method for preparing core-shell polymethyl methacrylate (PMMA)@TiO2@oxidized chitosan composite nanoparticles. The method uses plant oil-based monomers methyl methacrylate and methacrylic acid as raw materials. Polymethyl methacrylate microspheres are prepared as the "core" via microwave irradiation miniemulsion polymerization. Anatase-phase nano-TiO2 sol is then added dropwise under ultrasonic action to electrostatically assemble onto the outer periphery of the PMMA microspheres as the "shell." Subsequently, an oxidized chitosan solution is added dropwise for hydrothermal reaction and electrostatic self-assembly onto the outer surface of the PMMA@TiO2 core-shell particles. The method is simple, low-cost, requires mild reaction conditions, and is environmentally friendly. The resulting core-shell composite nanoparticles exhibit broad-spectrum antibacterial, UV protection, and pollutant photodegradation properties, and have great potential for application in textiles and apparel, home textiles, biomedicine, and the environment.

The invention relates to the technical field of ink-jet printing ink, in particular to a preparation process of polymer coated self-crosslinking dispersant modified pigment ink, which comprises the following steps: 1, weighing an anchoring monomer, a hydrophilic monomer and a crosslinking monomer according to a mass ratio of 3: 5: 2, and mixing; 2, adding deionized water and the self-crosslinking dispersing agent prepared in the step 1 into a dispersing tank; step 3, coating the polymer by adopting a core-shell miniemulsion polymerization method; 4, adding a water-soluble solvent, a defoaming agent and a sterilizing agent into the polymer coated pigment emulsion prepared in the step 3; the self-crosslinking dispersing agent designed by the invention has anchoring groups, hydrophilic chains and crosslinkable active sites, the anchoring groups can be tightly adsorbed on the surface of a pigment, the hydrophilic chains provide steric hindrance to realize preliminary stabilization, and the active sites participate in a crosslinking reaction in a subsequent polymerization process, so that the dispersing agent and a coated polymer form covalent binding; the interface bonding force between the dispersing agent and the pigment and the coating layer is obviously improved, and the desorption of the dispersing agent and the agglomeration of the pigment are effectively avoided.

The invention discloses an elastic shape-stabilized phase change material and a preparation method and application thereof, and belongs to the technical field of heat insulation materials and preparation thereof.The preparation method comprises the steps that firstly, paraffin and polymer phase change microcapsule emulsion is prepared through a miniemulsion method; then, polyvinyl alcohol is dissolved in the phase change microcapsule emulsion, and steeping liquor is obtained; finally, melamine sponge subjected to carbonization treatment is soaked in the steeping liquor, and the melamine sponge is taken out after being soaked and dried to obtain the elastic shape-stabilized phase change material. The shape-stabilized phase change material prepared by the invention has high paraffin content and phase change latent heat, the microencapsulated paraffin is not easy to leak, the carbonized melamine sponge carrier has good thermal conductivity, the shape can be arbitrarily cut, and the carbonized melamine sponge carrier has good elasticity and has good application prospects in the aspect of thermal insulation materials.

The present invention relates to a process for the preparation of chiral alpha-amino acids using a protease enzyme in combination with catalytic amounts of an aldehyde for the racemization of an unwanted isomer in a miniemulsion system.