968 results about "Oil emulsion" patented technology

The invention relates to the technical field of functional materials, in particular to a hollow multi-shell material as well as a low-temperature preparation method and application thereof, which comprises the following steps: 1) mixing a water or alcohol solution of a precursor A with an oil phase to prepare a water-in-oil emulsion, or dispersing the water solution of the precursor A into liquid drops by a spraying method; 2) freezing the emulsion or liquid drops obtained in the step 1) at low temperature to obtain ice template particles containing a precursor A; (3) adding the ice template particles obtained in the step (2) into a precursor B solution, controlling the temperature by a program, melting the ice template, and carrying out precipitation or polymerization reaction on A and B to obtain metal fluoride, carbonate or other hollow multi-shell materials; and 4) using the hollow multi-shell layer obtained in the step 3) as an electrolyte additive. The electrolyte additive can improve the viscosity of an electrolyte, improve the ionic conductivity, stabilize a solid electrolyte interface film, effectively inhibit the growth of lithium dendrites, improve the coulombic efficiency of a battery and prolong the cycle life of the battery.

A polishing filter apparatus employed within a sump pump system for removing mineral oils, natural ester, and synthetic ester-based fluids from an emulsion is provided. The polishing filter apparatus is connected to a sump pump barrier via a polishing filter inlet conduit. Further conduit structures are disposed within the polishing filter apparatus, which lead into a polishing filter cartridge. The polishing filter removes excess synthetic ester-based fluids from a water / oil emulsion fluid flowing therethrough and releases a resultant filtered fluid. The polishing filter cartridge contains a filtration media with a hydrophilic composition for the capture of synthetic ester-based fluid having a surface tension dissimilar to water, and the hydrophilic composition of the media has a surface energy greater than or equal to 35 dynes per centimeter.

The invention provides water-in-oil type emulsion gel loaded with probiotics and a preparation method of the water-in-oil type emulsion gel, and belongs to the technical field of probiotic products, the water-in-oil type emulsion gel loaded with the probiotics comprises a water phase and an oil phase, and the internal water phase is composed of gel and probiotic suspension; and the external oil phase consists of edible oil, a lipophilic emulsifier and at least one oil gelator. According to the water-in-oil emulsion gel, the stability of entrapped probiotics can be remarkably improved, meanwhile, the activity of the entrapped probiotics in the processing, storage and digestion processes is improved, particularly, the normal-temperature storage time is prolonged by 3 months, and a scientific basis is provided for normal-temperature food development.

The invention belongs to the technical field of extraction agents, and particularly relates to application of a dialkyl phosphinic acid compound as an extraction agent. According to the application of the dialkyl phosphinic acid compound as the extraction agent, the dialkyl phosphinic acid compound has a structure as shown in a formula 1: # imgabs0 #, R1 to R4 are independently-H or first alkyl, and R1 and R2 cannot be-H at the same time; r5 and R6 are independently a second alkyl group; the total number of C atoms in the dialkyl phosphinic acid compound is 16 to 40. Alpha-C of a P atom in the dialkyl phosphinic acid compound has a branched chain, so that adjacent positions of polar groups P = O and P-OH have high steric hindrance, water molecules are difficult to approach the polar group part of the compound, and the extractant has good fat solubility and is not easy to form a water-in-oil emulsion. Polymers are not easy to form among molecules of the dialkyl phosphinic acid compound, and the dialkyl phosphinic acid compound does not need to be heated to 40 DEG C or above in the using process.

The invention discloses a water-in-oil emulsion, a preparation method, application, a membrane and a cosmetic product containing the same. The water-in-oil emulsion is prepared from the following components in parts by weight: 0.25 to 50.00 parts of water phase, 0.45 to 80.00 parts of oil phase, 0.025 to 5.00 parts of emulsifier, 1 part of sterol and / or sterol derivative, 0.01 to 30.0 parts of powder and 0 to 3 parts of polymer. The water-in-oil emulsion disclosed by the invention can form a liquid crystal structure which is regularly and orderly arranged in space according to a certain direction, has low film forming continuity, hydrophobicity, flexibility of a wax film and excellent air permeability, and also has certain migration resistance of a high-molecular polymer film, but the brittleness is improved. In addition, the brittleness of a layer of uniform and continuous three-dimensional network structure film formed on the skin by the polymer can be improved, and the flexibility and uniformity are improved.

The invention provides a liposome-exosome hybrid vesicle as well as a preparation method and application thereof, and relates to the field of biomedicine. The preparation method comprises the following steps: mixing an organic phase containing lipidosome and a water phase containing anionic polysaccharide, emulsifying to form a water-in-oil emulsion, then removing an unemulsified organic phase in the water-in-oil emulsion, and then sequentially hydrating and homogenizing to obtain the anionic polysaccharide lipidosome, the exosome and the anionic polysaccharide lipidosome are fused, then cationic polysaccharide is added, and after incubation, membrane extrusion is performed to obtain the lipidosome-exosome hybrid vesicle. According to the preparation method and the liposome-exosome hybrid vesicle prepared by the preparation method, the defects in exosome application are relieved.

A polishing filter employed within a sump pump system for removing mineral oils, natural ester, and synthetic ester-based fluids from an emulsion is provided. The polishing filter is disposed within a sump pump barrier and is gravity-fed a synthetic ester and water based emulsion via a polishing filter conduit. The polishing filter removes excess synthetic ester-based fluids from a water / oil emulsion fluid flowing through a barrier canister disposed within the sump pump barrier above the polishing filter and releases a resultant filtered fluid. The polishing filter cartridge contains a filtration media with a hydrophilic composition for the capture of synthetic ester-based fluid having a surface tension dissimilar to water, and the hydrophilic composition of the media has a surface energy greater than or equal to 35 dynes per centimeter.

The invention belongs to the technical field of emulsion preparation, and particularly relates to cinnamon essential oil emulsion as well as a preparation method and application thereof. The cassia bark essential oil emulsion is prepared by jointly emulsifying cassia bark essential oil by utilizing a Chinese honeylocust fruit water extract and soybean protein isolate. The production process is simple, the production cost is low, large-scale production is facilitated, and the prepared cinnamon essential oil emulsion has good storage stability at the temperature of 4 DEG C and also shows excellent electrolyte, pH value, temperature and freeze-thaw stability. The method is suitable for the fields of food, packaging materials, medicines and the like, and the preservation capacity of the prepared cinnamon essential oil emulsion can be comparable with that of a commercial food preservative potassium sorbate.

The invention discloses a viscosity detection device and method for amino silicon oil emulsion production, and belongs to the technical field of amino silicon oil emulsion detection.The viscosity detection device comprises a main body module and an automatic detection module, the main body module comprises a conveying frame, the top of the conveying frame is fixedly connected with a testing frame, longitudinal grooves are formed in the two sides of the testing frame, and the longitudinal grooves are communicated with the conveying frame; the automatic detection module comprises a lifting sliding plate connected between the inner walls of the two longitudinal grooves in a sliding mode, a lifting assembly is arranged between the two sides of the inner wall of the testing frame and connected with the top of the lifting sliding plate, and rail assemblies are arranged on the two sides of the testing frame; through the arrangement of the lifting assembly, the viscosity testing device main body, the track assembly, the transmission assembly and the conveying assembly, the device can continuously detect multiple amino silicon oil emulsions, the whole detection process is smoother, more amino silicon oil emulsions can be conveniently detected, and meanwhile the detection efficiency is further improved.

The present invention is a composition for caring for and / or making up keratin materials, in particular the skin, in the form of a water-in-oil emulsion comprising, in particular in a physiologically acceptable medium: a) at least one continuous oily phase comprising i) at least one volatile oil and ii) at least one nonvolatile oil; and b) at least one aqueous phase dispersed in said oily phase, wherein the amount of water is less than 20.0% by weight relative to the total weight of the composition; and c) at least one hydrophobic film-forming polymer; and d) at least one emulsifying surfactant chosen from linear polyoxyalkylenated polydimethylmethylsiloxanes with an HLB ≤ 8.0; and e) at least one hyaluronic acid; and f) at least one vitamin B3 and / or a derivative thereof; and g) at least one xanthine base and / or a plant extract containing same.

The invention discloses application of a particle stabilizer, an oil-in-oil Pickering emulsion as well as a preparation method and application of the oil-in-oil Pickering emulsion, and relates to the technical field of emulsion preparation. The particle stabilizer is used for preparing the oil-in-oil Pickering emulsion, and the particle stabilizer is solid insoluble nanoparticles and is selected from one or more of inorganic nanoparticles, organic nanoparticles, composite oleophobic nanoparticles and stimuli-responsive nanoparticles. The preparation method of the oil-in-oil Pickering emulsion comprises the following steps: mixing the first oil phase, the second oil phase and the particle stabilizer, and carrying out an emulsification technology to obtain the oil-in-oil Pickering emulsion. According to the emulsion system prepared by the invention, the oil phase components with different polarity differences are reasonably matched, and the oil phase type is flexibly selected according to specific requirements of target application, so that the environmental adaptability and the function application range of the emulsion can be remarkably improved, and the emulsion system has a good application prospect.

The invention provides a natural amphiphilic lignin nanoparticle emulsifier for an oil-based drilling fluid as well as a preparation method and application of the natural amphiphilic lignin nanoparticle emulsifier, and belongs to the technical field of oilfield chemical drilling fluids. The preparation method of the emulsifier comprises the following steps: fully dissolving alkali lignin in an organic solvent; filtering, dropwise adding filtrate into deionized water, fully dispersing, and dialyzing; and then carrying out ultrasonic treatment, centrifuging, washing and drying. The emulsifier takes the biomass-based polymer industrial alkali lignin as a raw material, and is green, non-toxic, cheap and easy to obtain; the preparation method is simple, short in period and free of harmful by-products, the organic solvent can be recycled, and the cost is low. The lignin nanoparticles are added into the oil-based drilling fluid as an emulsifier, so that the stability of the oil-based drilling fluid under a high-temperature condition can be remarkably improved; a compact interfacial film can be formed at an oil-water interface, and a three-dimensional network structure with viscoelasticity can be formed in a continuous phase, so that the stability of a water-in-oil emulsion is improved.

The invention discloses a preparation method of a lithium battery-structure integrated composite material, and belongs to the technical field of lithium battery preparation. The method comprises the following steps: uniformly mixing epoxy resin, a diluent, a curing agent 1 and a lipophilic emulsifier to obtain a dispersion liquid 1; dropwise adding an electrolyte solution into the dispersion liquid 1 at a constant speed, and stirring at a constant temperature and a high speed to obtain a water-in-oil emulsion; uniformly mixing deionized water, a hydrophilic emulsifier and a curing agent 2 at a constant temperature to obtain dispersion liquid 2; adding the water-in-oil emulsion into the dispersion liquid 2, and emulsifying at a high speed to obtain a water-in-oil-in-water emulsion system; heating and curing the water-in-oil-in-water emulsion system; after curing, centrifuging, washing and drying to obtain a solid nano adhesive; and grinding the solid nano adhesive, and then uniformly paving the solid nano adhesive in a mold for high-temperature treatment to obtain the lithium battery diaphragm. The electrolyte solution is selected as the internal water phase of the water-in-oil emulsion, so that the internal osmotic pressure of the emulsion can be increased, the emulsion is prevented from being fused, and the particle size is increased.

The invention relates to the technical field of wound care, in particular to a responsive release microcapsule as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, dissolving a polylactic acid-glycolic acid copolymer in an organic solvent, adding an emulsifier, and carrying out ultrasonic emulsification to form a water-in-oil emulsion; s2, mixing a polyphenol compound, elastin, vegetable fat and probiotic suspension to form a quaternary mixed solution, slowly dropwise adding the quaternary mixed solution into the water-in-oil emulsion, continuing ultrasonic emulsification to form multiple emulsion, and evaporating to remove an organic solvent to obtain a quaternary system active component mixed solution; and S3, dissolving PDMAEMA in deionized water, adding a cross-linking agent, stirring, slowly dropwise adding the quaternary system active component mixed solution, carrying out a cross-linking reaction, and freeze-drying to obtain the responsive release microcapsule. The microcapsule can accurately release corresponding active ingredients according to pH value changes in different stages of wound healing, effectively shorten the wound healing time, improve the healing quality and reduce scar formation.

The invention belongs to the technical field of thick oil emulsification viscosity reduction, and particularly discloses an amphiphilic Janus carbon nanotube thick oil emulsification viscosity reducer and a preparation method and application thereof, and the preparation method comprises the following steps: firstly, adding a multi-walled carbon nanotube into a strong acid solution; secondly, adding a first solvent, and then adding molten paraffin to obtain paraffin microspheres wrapped by activated carbon nanotubes; thirdly, adding into a second solvent, so as to obtain carbon nanotube paraffin microspheres asymmetrically modified by vinyl trimethylsilane; and finally, adding into a third solvent to react with the first modifier, and then adding into a fourth solvent to react with the second modifier to obtain the viscosity-reduced Janus carbon nanotube. According to the amphiphilic Janus carbon nanotube thick oil emulsifying viscosity reducer as well as the preparation method and the application thereof, the viscosity reduction rate reaches 99.47%, the amphiphilic Janus carbon nanotube thick oil emulsifying viscosity reducer has excellent wetting reversal and interfacial tension reduction capability, the recovery efficiency is improved by more than 25%, and the recovery efficiency improvement effect is remarkable.

The invention relates to a recyclable easily-degradable macromolecular surfactant for cleaning oily sludge and application of the recyclable easily-degradable macromolecular surfactant. The macromolecular surfactant is prepared by taking acrylamide, methacrylic acid long-chain alkyl ester and tertiary amino substituted methacrylate as raw materials through free radical polymerization. The macromolecular surfactant is dissolved in water to prepare a cleaning solution, and oily sludge can be efficiently eluted. CO2 and N2 are sequentially introduced into the oil-containing emulsion after the oil-containing sludge is cleaned, or diluted hydrochloric acid and a diluted alkali aqueous solution are sequentially added, the hydrophilic-hydrophobic property of the macromolecular surfactant is changed through pH regulation and control, separation of the macromolecular surfactant and an oil phase is achieved, petroleum resources are recycled, and recycling of the cleaning solution containing the macromolecular surfactant is achieved. The residual macromolecular surfactant in the cleaned deoiled sludge can be degraded under the action of environmental microorganisms.

To provide a water-in-oil emulsion cosmetic that excels in ease of reapplication, covering power, three-dimensional gloss, pigment dispersibility, and smooth spreadability.SOLUTION: A water-in-oil emulsion cosmetic comprises following components (A)-(D): (A) pigmentary titanium dioxide, (B) a powder dispersant that is liquid at 25°C, and contains three or more ester bonds, (C) a nonionic surfactant that is solid at 25°C, and (D) an aqueous component with √{(δp)2+(δh)2} under 20 in the Hansen solubility parameter.

The present invention relates to a composition in the form of a water-in-oil emulsion, including, (a) one or more esters formed from at least one fatty acid having more than 13 carbon atoms; (b) a polymer component including one or more polymerized (iso)butenes; (c) at least about 3% by weight of one or more carbohydrate fatty acid ester emulsifiers; (d) one or more fillers comprising hydrophobic silica; and (e) one or more pigments. The composition is substantially free of silicones & alkanes.

The invention relates to amino silicone oil emulsion as well as a preparation method and application thereof, and belongs to the technical field of silicone oil emulsion. A preparation method of the amino silicone oil emulsion comprises the following steps: mixing amino silicone oil, cocamidopropyl betaine and polyether modified silicone oil to obtain a homogeneous oil phase, adding deionized water in a gradient manner, and carrying out double refining to obtain a homogeneous phase; 3-aminopropyltrimethoxysilane and polyether modified polydimethylsiloxane are added for treatment, a modified homogeneous phase is obtained, hydroxymethyl cellulose and porous nano-silica are added, and mixing is performed to obtain the coating. Through compounding of the amino silicon oil, the cocamidopropyl betaine, the polyether modified silicon oil, the amino propyl trimethoxy silane, the polyether modified polydimethylsiloxane and the porous nano silicon dioxide, the stability of the amino silicon oil is synergistically improved, and the fabric is endowed with good flexibility and durability.

The invention provides a graphene oxide composite oil-displacing agent and a preparation method and application thereof.The graphene oxide composite oil-displacing agent is prepared from poly (3-hydroxytyramine) and graphene oxide, the poly (3-hydroxytyramine) and the graphene oxide are combined through chemical bonds, the preparation method comprises the steps that hydrochloric acid 3-hydroxytyramine and the graphene oxide are subjected to a mixed reaction, and the graphene oxide composite oil-displacing agent is obtained. The obtained composite oil-displacing agent is applied to tertiary oil recovery. The composite oil displacement agent provided by the invention has excellent hydrophilicity, acid and alkali resistance and salt resistance, can form a stable water-in-oil emulsion with crude oil in a wide pH value range or under high salinity, and can improve the stability and viscosity of the emulsion; the emulsifying effect is strong, the emulsifying swept volume can be enlarged, and the application prospect in medium-low permeability oil reservoirs is wide; the preparation method provided by the invention is simple, convenient and high in practicability.

The invention discloses conveying equipment and method based on amino silicon oil emulsion processing, and belongs to the technical field of amino silicon oil emulsions.The conveying equipment comprises a main body module and a multi-flow supply module, the main body module comprises a material box, the rear end face of the material box is fixedly connected with a first conveying pump, and the input end of the first conveying pump is fixedly connected with a supply pipe; the output end of the first conveying pump and the rear end of the material box are fixedly connected with a connecting pipe, the multi-flow supply module comprises a flow guide pipe fixedly connected to one side of the material box, and the bottom of the flow guide pipe is fixedly connected with a collecting box. According to the device, raw materials with different capacities can be fed into different amino silicone oil emulsion preparation devices, use of the different preparation devices is facilitated, the supply requirements of the different preparation devices are met, and the functionality of the device is improved.

The invention relates to the technical field of preparation of food additives, in particular to a betacyanin microcapsule as well as a preparation method and application thereof. The preparation method comprises the following steps: jointly dissolving sodium alginate and soybean protein isolate in water to obtain an SA-SPI compound; the SA-SPI compound, CaCO3 and betacyanin are mixed, and a water phase is formed; mixing liquid paraffin, glacial acetic acid and Tween 80 to obtain an acetic acid-containing oil phase; mixing the water phase with the acetic acid-containing oil phase to form a water-in-oil emulsion, and standing to form calcium alginate gel beads; the calcium alginate gel beads are subjected to pre-freezing-freeze-drying treatment, and the betacyanin microcapsules are obtained. The prepared betacyanin microcapsule has the characteristics of controllable particle size, high stability and easiness in industrialization, and the application range of betacyanin is widened. In addition, the preparation method disclosed by the invention is safe and simple to operate, has the advantages of low cost and high benefit, and can be directly applied to large-scale production.

The invention discloses a polyurethane structure modified epoxy silicone oil emulsion and a preparation method thereof. The emulsion comprises the following components in parts by weight: 100 parts of polyurethane structure modified epoxy silicone oil, 30-50 parts of an emulsifier and 5-10 parts of an antistatic agent, and after all the components are uniformly stirred and mixed, the silicone oil emulsion with the particle size distribution of 200-500nm is obtained through a phase inversion emulsification method. The polyurethane structure modified epoxy silicone oil emulsion is used as the oiling agent for producing the carbon fiber precursor, the oiling agent has the characteristics of good bundling property, strong wear resistance and high heat resistance, the protectiveness on the carbon fiber precursor is improved, surface defects caused by friction in production and operation are reduced, meanwhile, high heat resistance protection is provided for the pre-oxidized fiber in the carbonization stage, homogeneous pre-oxidation is realized, and the production efficiency is improved. The mechanical property and broken filament level of the carbon fiber can be effectively improved.

A method can include: in a heat exchanger, cooling a biocrude oil emulsion stream received from a biocrude oil emulsion source, wherein the emulsion can include a biocrude oil phase, an aqueous phase, and solids; in a first mixing vessel, mixing the emulsion with a solvent to dissolve the biocrude oil phase and form a biocrude-solvent solution; in a first separator assembly, separating the biocrude-solvent solution from the aqueous phase and the solids; in a solvent recovery apparatus, recovering solvent from the biocrude-solvent solution; in a second mixing vessel, mixing the solvent with the aqueous phase and the solids received from the first separator assembly to dissolve biocrude oil remaining in the aqueous phase and the solids; and supplying the solvent and biocrude oil to the first mixing vessel as the solvent. In some examples, such a method can more effectively separate biocrude oil from the emulsion than conventional techniques.

The invention provides a preparation method and application of graphene oily slurry. The preparation method comprises the following steps: converting aqueous graphene slurry into oily graphene slurry through a phase conversion method; the phase property conversion method comprises the following steps: adding an oily dispersant, base oil and a cosolvent into the graphene aqueous slurry to form a water-in-oil graphene emulsion; converting the water-in-oil emulsion into an oil-in-water emulsion through a reverse phase agent; and removing water and the cosolvent in the oil-in-water emulsion to obtain the graphene oily slurry. According to the technical scheme, the graphene oily slurry obtained through a phase property conversion method retains a good dispersion state of graphene in water-based slurry, and can be uniformly dispersed in base oil / lubricating oil through a simple mixing method, so that the problem that graphene powder is not easy to disperse when being directly added into the lubricating oil is avoided; the additive can be directly used as a lubricating oil additive, so that blending of the additive with good anti-wear and anti-friction performance can be realized by adopting conventional equipment.

Compositions and methods for use provide enhanced surface modification in leather care. In particular, the present disclosure is directed to water-based compositions including a silicone emulsion that delivers cleaning, protective, and preservative qualities.

The invention provides a preparation method of a novel magnetic response polyether demulsifier, which comprises the following specific steps: accurately weighing a certain amount of ferric chloride hexahydrate, mixed polyether demulsifier and multi-walled carbon nanotube, adding into a beaker together with a certain amount of solvent and assistant, carrying out ultrasonic treatment for a period of time to uniformly mix, adding into a reaction kettle with a polytetrafluoroethylene lining, and carrying out ultrasonic treatment for a period of time to obtain the magnetic response polyether demulsifier. Then introducing nitrogen for purging replacement, putting the reaction kettle into a drying oven, heating to a certain temperature, reacting for a certain time, cooling to room temperature after the reaction is completed, taking out, washing with an ethanol-water solution for multiple times, and drying to finally prepare the novel magnetic response polyether demulsifier. The prepared novel magnetic response polyether demulsifier has a good demulsification effect on thick oil emulsion with the water content higher than 90%, and under the action of an external magnetic field, rapid demulsification can be achieved, and recycling is easy to achieve.

The invention discloses a temperature-adjusting antibacterial microcapsule material and a preparation method and application thereof.The preparation method comprises the steps that S1, paraffin and a microcapsule wall material precursor are mixed, heated and stirred, and an oil phase solution is formed; s2, dispersing an emulsifier in a water-phase solvent, heating and stirring to form a water-phase solution; s3, uniformly mixing the oil-phase solution with the water-phase solution, and performing ultrasonic emulsification to obtain a homogeneous oil-in-water emulsion; s4, dropwise adding alkali liquor into the oil-in-water emulsion, initiating hydrolysis and condensation polymerization of the microcapsule wall material precursor, and performing suction filtration, water washing and drying on the obtained product to obtain microcapsule powder; and S5, adding the microcapsule powder into a metal salt solution, carrying out a reaction under heating and stirring conditions, and carrying out suction filtration, water washing and drying on the obtained product to obtain the temperature-adjusting antibacterial microcapsule material. The polysiloxane coated paraffin phase change energy storage microcapsule is prepared by a sol-gel method, and hydroxyl on a wall material is complexed with metal ions, so that the thermal conductivity of the microcapsule is improved, and meanwhile, the antibacterial effect is also enhanced.

The invention relates to the technical field of materials, and discloses a super-hydrophobic porous organic cage modified melamine sponge material as well as a preparation method and application thereof. The preparation method comprises the following steps: taking melamine sponge as a substrate, and modifying the substrate with a super-hydrophobic porous organic cage by adopting a solvothermal method to obtain the super-hydrophobic porous organic cage modified melamine sponge material. The material not only has obvious super-hydrophobicity, but also can efficiently demulsify a water-in-oil emulsion, has excellent reusability, and expands the application fields of porous materials and melamine sponges.

Provided are: zinc oxide powders from which a cosmetic capable of exhibiting excellent visible light transmittance and ultraviolet shielding ability when applied to the skin can be prepared; and a composition for an oil-dispersible cosmetic and a cosmetic in which the zinc oxide powders are blended.　Zinc oxide powders according to the present invention are characterized in that D50 in the number distribution obtained from a transmission electron microscope image is 100-200 nm, the aspect ratio is 1.1-1.4, and the crystallite diameter obtained from an X-ray diffraction spectrum is 70-200 nm. Moreover, a composition for an oil-dispersible cosmetic according to the present invention is characterized in that the zinc oxide powders according to the present invention are dispersed in oil. A water droplet-in-oil emulsion cosmetic according to the present invention and an oil droplet-in-water emulsion cosmetic according to the present invention are characterized in that the composition for an oil-dispersible cosmetic according to the present invention is blended or the zinc oxide powders according to the present invention are blended. A powder cosmetic according to the present invention is characterized in that the zinc oxide powders according to the present invention are blended.