CN111534284A - Phase-change microcapsule and preparation method thereof - Google Patents
Phase-change microcapsule and preparation method thereof Download PDFInfo
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Abstract
The invention provides a phase-change microcapsule and a preparation method thereof, wherein the phase-change microcapsule comprises: a capsule core, which is a hydrophobic material with solid/liquid phase change in the temperature range of 0-70 ℃; an intermediate layer located at the outer periphery of the capsule core, wherein the intermediate layer is selected from any one of polymers, inorganic substances, organic substances and organic-inorganic hybrid materials; and an outer layer located at a peripheral portion of the intermediate layer, the outer layer being a hybrid particle whose surface includes a hydrophilic region and a hydrophobic region, the hybrid particle exhibiting both hydrophilicity and hydrophobicity. The phase change microcapsule provided by the invention has good energy storage stability, can effectively prevent the leakage of the core material, and has high microcapsule coating efficiency, good sphericity and low energy consumption.
Description
Technical Field
The invention belongs to the technical field of microcapsules, and particularly relates to a phase change microcapsule and a preparation method thereof.
Background
The phase-change microcapsule is formed by wrapping a phase-change material in a wall shell by utilizing a microcapsule technology to form tiny particles, so that the problems of volume change and core material leakage during phase change of the phase-change material are solved, and the phase-change material is prevented from contacting the outside. The phase-change microcapsule achieves the purpose of controlling the temperature of the material by utilizing the characteristic that the coated phase-change material stores and releases energy when undergoing phase transition, and can be widely applied to the fields of aerospace, buildings, automobiles, environmental protection, textile clothing, medical sanitation, electronic device cooling, military camouflage and the like.
The existing phase change microcapsules have the problems of relatively single function, poor energy storage stability, low coating rate, easy collapse and high energy consumption, so that the industrial production is difficult to realize.
Therefore, it is very important to provide a preparation method for obtaining the phase-change microcapsule with high coating efficiency, good sphericity and low energy consumption.
Disclosure of Invention
In view of the above-mentioned disadvantages of the prior art, an object of the present invention is to provide a phase change microcapsule which has good energy storage performance, high stability, high coating efficiency, good sphericity and low energy consumption.
Another object of the present invention is to provide a method for preparing a phase-change microcapsule.
The present invention provides a phase-change microcapsule, comprising: a capsule core, which is a hydrophobic material with solid/liquid phase change in the temperature range of 0-70 ℃; an intermediate layer located at the outer periphery of the capsule core, wherein the intermediate layer is selected from any one of polymers, inorganic substances, organic substances and organic-inorganic hybrid materials; and an outer layer located at a peripheral portion of the intermediate layer, the outer layer being a hybrid particle whose surface includes a hydrophilic region and a hydrophobic region, the hybrid particle exhibiting both hydrophilicity and hydrophobicity.
In an embodiment of the present invention, the hydrophobic material is selected from any one of tetradecane, hexadecane, octadecane, docosane, stearic acid, tetradecanol, hexadecanol, and octadecanol.
In an embodiment of the present invention, the intermediate layer is a polymer material obtained by polymerizing: 10-90 wt% of a first monomer; 0.1 to 1 weight percent of a second monomer comprising a multifunctional monomer; 0.1 to 0.2 wt% of an initiator; the first monomer, the second monomer and the initiator are obtained by free radical polymerization in the water phase and/or the hydrophobic system.
In one embodiment of the present invention, the surface of the hybrid particle includes a plurality of functional groups selected from a combination of hydroxyl, mercaptopropyl, methyl, propyl, aminopropyl, epoxy, monoamino, diamino, polyether, alicyclic epoxy, thiol, carboxyl, hydrogen, methacrylic, phenolic, alkoxy, ester, alkyl, fluoroalkyl, diol, monoalkylamino, dialkylamino, aryloxy, acyloxy, alkylcarbonyl, aryl, alkenyl, substituted and unsubstituted alkynyl, cycloalkyl, ether, anilino, amide, mercapto, aldehyde, alkenyl, alkynyl, acrylic, acryloxy, methacryloxy, cyano and isocyano groups.
In one embodiment of the present invention, the hybrid particles have a particle size of 30 to 1000 nm.
The present invention also provides a phase-change microcapsule, comprising: a capsule core, which is a hydrophobic material with solid/liquid phase change in the temperature range of 0-70 ℃; an intermediate layer located at an outer peripheral portion of the capsule core; an outer layer located at a peripheral portion of the intermediate layer, the outer layer being a hybrid particle whose surface includes a hydrophilic region and a hydrophobic region, the hybrid particle exhibiting both hydrophilicity and hydrophobicity; the middle layer is a polymer film layer obtained by crosslinking and polymerizing acrylate monomers in the presence of the capsule core and the outer layer.
The invention also provides a preparation method of the phase-change microcapsule, which comprises the following steps: providing a capsule core, wherein the capsule core is made of a hydrophobic material with solid/liquid phase change in a temperature range of 0-70 ℃; an intermediate layer formed on the outer periphery of the capsule core, the intermediate layer being a polymer material; and an outer layer formed on a peripheral portion of the intermediate layer, the outer layer being a hybrid particle whose surface includes a hydrophilic region and a hydrophobic region, the hybrid particle exhibiting both hydrophilicity and hydrophobicity.
In one embodiment of the invention, the method comprises the following steps: providing water comprising said hybrid particles; adding a first monomer, a second monomer, an initiator and a hydrophobic material into the water, and mixing to form a pre-emulsion; polymerizing the pre-emulsion to obtain the phase change microcapsule.
In an embodiment of the invention, the concentration of the aqueous dispersion comprising hybrid particles is between 0.1 wt.% and 20 wt.%.
In one embodiment of the present invention, the mixing rate is 1000-3000 rpm.
In one embodiment of the invention, the temperature of the polymerization is 10 to 90 ℃.
The invention provides a phase change microcapsule, which is prepared by using hybrid particles with hydrophilic areas and hydrophobic areas on the surface as an emulsifier to emulsify a lipophilic phase change material to form stable emulsion and combining a suspension polymerization technology, and has the advantages of high coating efficiency, good sphericity and low energy consumption, wherein the coating efficiency can reach 99.7 percent, the microcapsule is of a spherical structure, and the phase change microcapsule has good energy storage stability and can effectively prevent core material leakage. In addition, in the preparation process of the phase-change microcapsule, the emulsion can be subjected to a low-speed stable system under the condition of 1000-3000rpm, so that the industrial production can be realized, and the preparation process is simple, has low requirements on the preparation environment, short preparation period and lower cost, and has great economic benefit. Other features, benefits and advantages will be apparent from the disclosure including the description and claims detailed herein.
Drawings
Fig. 1 is a schematic structural diagram of one embodiment of a phase-change microcapsule provided according to the present invention.
FIG. 2 is a schematic flow chart of an embodiment of a method for preparing phase-change microcapsules according to the present invention.
Fig. 3 is a scanning electron micrograph of the phase-change microcapsules provided in example 1 of the present invention.
FIG. 4 is a differential scanning calorimetry trace of phase change microcapsules provided in accordance with example 1 of the present invention.
Fig. 5 shows the thermal weight loss curve and the differential of the phase-change microcapsule provided in example 1 of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the specific material ratios, process conditions, results, etc. described in the examples of the present disclosure are only for illustrating the present disclosure and should not be construed as limiting the scope of the present disclosure, and all equivalent changes or modifications made according to the spirit of the present disclosure should be covered by the scope of the present disclosure. Note that "%" shown in the description herein means "part by mass" unless otherwise specified.
Referring next to fig. 1 and fig. 2, a method for preparing phase-change microcapsules includes forming a core 10, an intermediate layer 20, and an outer layer 30, where the core 10, the intermediate layer 20, and the outer layer 30 are sequentially disposed to form phase-change microcapsules having a core-shell structure, and the core 10 is encapsulated and protected by the intermediate layer 20 and the outer layer 30. The functions of the phase-change microcapsules include preparing a liquid or gas into a dry powder, reducing volatility, making it difficult to volatilize some materials that are easily volatilized, improving the stability of materials (materials that are easily oxidized, easily decomposed by light, and easily affected by temperature or moisture), masking taste, isolating active ingredients, or controlling release, and the like. The microcapsule preparation method comprises forming the intermediate layer 20 between the capsule core 10 and the outer layer 30 under the condition that the capsule core 10 and the outer layer 30 form a preliminary core-shell structure, thereby obtaining a stable core-shell structure.
Referring next to fig. 1 and 2, in some embodiments of the present invention, the microcapsule is prepared by dispersing the outer layer material into the water phase or the oil phase (i.e., hydrophobic system), mixing and emulsifying with the core material, the monomer, the initiator, etc., to obtain the oil-in-water or water-in-oil Pickering emulsion, and then polymerizing at a certain temperature, and finally preparing the microcapsule, wherein the microcapsule is prepared by the following steps S1-S3.
Referring to fig. 2, step S1 is performed to provide a hybrid particle and disperse the hybrid particle in water to form an aqueous dispersion. The hybrid particles constitute the outer layer 30 of the microcapsule as a component of the microcapsule. The hybrid particles have both hydrophilicity and lipophilicity (hydrophobicity), and have strong emulsifying capacity and emulsion stability. The surface of the hybrid particles comprises distinct hydrophilic and hydrophobic regions, one side of the hydrophilic region can enter the aqueous phase material, one side of the hydrophobic region can enter the oil phase material, and the hydrophilic region can be stabilized at the interface of the aqueous phase material/oil phase material, i.e. the emulsion stabilized by the hybrid particles belongs to a thermodynamically stable system. The phase-change microcapsule of the invention uses the hybrid particles as an emulsifier and is dispersed into water, the concentration of the hybrid particles is 0.1-20 wt.%, and then oil phase consisting of the core material and the material of the intermediate layer is mixed and emulsified to obtain oil-in-water Pickering emulsion, and then polymerization reaction is carried out at a certain temperature to prepare the phase-change microcapsule.
The hybrid particles are for example inorganic or organic hybrid particles, but also organic-inorganic hybrid particles, varying in size from nanometric to micrometric, for example having a size of 30nm to 1000nm, for example 45nm, 75nm, 100nm, 800nm, etc. Specific examples include Janus particles.
In some embodiments, the hybrid particle may be obtained by modifying inorganic particles with a plurality of functional groups, which may be selected from, for example, a combination of hydroxyl groups, mercaptopropyl groups, methyl groups, propyl groups, aminopropyl groups, epoxy groups, monoamino groups, diamino groups, polyether groups, alicyclic epoxy groups, thiol groups, carboxyl groups, hydrogen groups, methacrylic groups, phenolic groups, alkoxy groups, ester groups, alkyl groups, fluoroalkyl groups, diol groups, monoalkylamino groups, dialkylamino groups, aryloxy groups, acyloxy groups, alkylcarbonyl groups, aryl groups, alkenyl groups, substituted and unsubstituted alkynyl groups, cycloalkyl groups, ether groups, aniline groups, amide groups, mercapto groups, aldehyde groups, alkenyl groups, alkynyl groups, acrylic groups, acryloxy groups, methacryloxy groups, cyano groups, and isocyano groups, such that the surface of the obtained hybrid particle exhibits hydrophilicity and hydrophobicity, and further, may be selected from hydroxyl groups, mercapto groups, amino groups, methacrylic groups, and isocyano groups, Mercaptopropyl, methyl, propyl, aminopropyl, epoxy.
In some embodiments, the inorganic particles may be selected from any of silicon dioxide, metal salts such as calcium, magnesium, iron, zinc, nickel, titanium, aluminum, silicon, barium, and manganese salts, oxides and hydroxides, titanium dioxide, aluminum oxide, aluminum hydroxide and zinc sulfide, silicates, bentonite, hydroxyapatite and hydrotalcite, silica, magnesium pyrophosphate, and tricalcium phosphate, for example, with the understanding that the inorganic particles are 30-1000nm, such as 45nm, 75nm, 100nm, 500nm, and the like.
The hybrid particles can be prepared, for example, by a microfluidics method, a seed emulsion method, an emulsion/sol-gel combination method, etc., so that the surface thereof is divided into two regions having distinct hydrophilic and hydrophobic regions. In some embodiments, the hybrid particles can be prepared, for example, by adding 5-30 wt% of the first modifier and an alcohol solvent, such as absolute ethanol, to a flask. The flask was placed in a constant temperature water bath. Opening an electric stirring device, adding 10-100 wt% of particles into the system, reacting for a period of time to obtain particles modified by the first modifier, filtering, washing to remove free modifier, drying in vacuum, and processing to obtain powder of the particles modified by the first modifier. Next, paraffin was added to the flask and the system was maintained above the melting point of paraffin to completely melt the paraffin. The first modifier-modified particle powder and water were added to the flask with constant stirring. After a period of time, the system was cooled to below the melting point of the paraffin wax. Then, an alkali solution, such as a NaOH solution, is added to the system to react with 5 to 30 wt% of the second modifier exposed to the aqueous phase in the system, and after a certain period of reaction, the paraffin wax droplets are washed several times with deionized water to remove excess NaOH, and finally, carbon tetrachloride is added to remove paraffin wax, and through centrifugal separation, amphiphilic hybrid particles are finally obtained.
The first modifier and the second modifier are substances with hydroxyl, mercaptopropyl, methyl, propyl, aminopropyl, epoxy, monoamino, diamino, polyether group, alicyclic epoxy group, thiol group, carboxyl group, hydrogen group, methacrylic group, phenol group, alkoxy group, ester group, alkyl group, fluoroalkyl group, diol group, monoalkylamino group, dialkylamino group, aryloxy group, acyloxy group, alkylcarbonyl group, aryl group, alkenyl group, substituted and unsubstituted alkynyl group, cycloalkyl group, ether group, aniline group, amide group, mercapto group, aldehyde group, alkenyl group, alkynyl group, acrylic group, acryloxy group, methacryloxy group, cyano group and isocyano group, the first modifier is different from the second modifier, and after modification by the first modifier and the second modifier, the surface of the hybrid particle simultaneously exhibits hydrophilicity and lipophilicity.
In some embodiments, the amount of ethanol is 100-300mL, such as 100mL, 150mL, 200mL, based on the amount of the first and second modifiers based on 5-30 wt% of the particles, the modification temperature is 20-70 ℃, such as 25 ℃, 35 ℃, 55 ℃, 65 ℃, the NaOH concentration is 5-20 wt%, such as 10 wt%, 13 wt%, and the reaction time is 1-4h, such as 3h, 4 h.
Referring to fig. 2, the step S2 is performed to add the hydrophobic core material, the first monomer, the second monomer, and the initiator into the reaction medium, and mix and emulsify the mixture to form a pre-emulsion. The hydrophobic core material constitutes a core 10 of the microcapsule as a component of the microcapsule. The core material is a hydrophobic material with solid/liquid phase change within the temperature range of 0-70 ℃, further for example 40-60 ℃, the core material is dispersed in the water, and forms a preliminary core-shell structure through the amphiphilic hybrid particles.
In some embodiments, the hydrophobic material may be aliphatic hydrocarbon, further, aliphatic hydrocarbon having 14 to 22 carbon atoms and mixtures thereof, and specific examples may list tetradecane, hexadecane, octadecane, docosane, stearic acid, tetradecanol, hexadecanol, octadecanol and the like.
The intermediate layer 20 of the microcapsule is formed of a polymer material obtained by radical polymerization of the first monomer, the second monomer, and the initiator in water, and the intermediate layer 20 of the microcapsule is formed of the microcapsule in the presence of the core material and the hybrid particles to form a stable core-shell structure, and the intermediate layer 20 of the microcapsule is merely a polymer material prepared by monomer polymerization.
In some embodiments, the first monomer may be one or more of acrylates including acrylate, methyl methacrylate, butyl acrylate, vinyl acetate, styrene, hydroxyethyl methacrylate, ethyl acrylate, acrylamide, aniline, acrylic acid, hydroxyethyl acrylate, itaconic acid, fumaric acid, hydroxypropyl acrylate, n-methylol acrylamide, sodium vinyl sulfonate, sodium styrene sulfonate, and the like, but is not limited thereto, and may be all monomers capable of undergoing radical polymerization.
In some embodiments, the second monomer may be one or more of divinylbenzene, dipropylene glycol diacrylate, 1, 6-ethylene glycol diacrylate, diethylene glycol diacrylate phthalate, ethylene glycol dimethacrylate, etc., but is not limited thereto, and may be all of the polyfunctional monomers capable of undergoing radical polymerization.
In some embodiments, the initiator may be one or more of azobisisobutyl, azobisisoheptonitrile, dimethyl azobisisobutyrate, tert-butyl peroxybenzoate, benzoyl peroxide, ammonium persulfate, potassium persulfate, hydrogen peroxide, azobisbutyl amidine hydrochloride, and the like, but is not limited to the above initiators and may be all initiators capable of initiating free radical polymerization.
In some embodiments, the hybrid particles, the core material, the first monomer, the second monomer, and the initiator in the reaction medium are mixed and emulsified, for example, in a homogenizer, at a mixing rate of 1000-. Further, the emulsification can be between 10 and 50℃To improve the emulsifying and dispersing effect.
Referring to fig. 2, the step S3 is performed to polymerize the pre-emulsion to obtain the phase-change microcapsules. In some embodiments, the reaction temperature during the polymerization process is 10 to 90 ℃, for example, 20 ℃, 40 ℃, 65 ℃, 70 ℃, but is not limited thereto, and may be selected according to the kind of the initiator.
In some embodiments, the reaction time in the polymerization process is between 1h and 8h, for example, 4h and 6h, but is not limited thereto, and the specific reaction time can be selected according to the kind of the initiator.
In some embodiments, the method further comprises the steps of performing suction filtration, washing and drying on the polymerized product to finally obtain the phase-change microcapsule product.
The invention will be explained in more detail below by means of specific examples.
In one embodiment of the present invention, the present invention provides a phase change microcapsule 1, 10g of oleic acid and 150mL of anhydrous ethanol are added to a single-neck flask. The flask was placed in a thermostatic water bath at 20 ℃. The electric stirring apparatus was turned on, and the rotation speed was set to 300 rpm. Then 10g of nanosilica was added to the system. After 8 hours, the product was filtered and the oleic acid-modified nanosilica particles were washed 3 times with chloroform to remove free oleic acid and then dried in vacuo at 20 ℃. The modified SiO2 powder is obtained after treatment.
20g of paraffin wax was added to a 100mL single-neck flask, and the system was maintained at 70 ℃ to completely melt the paraffin wax. 5g of modified SiO2 powder and 100mL of deionized water were added to the flask, which was continuously stirred at 300 rpm. After 1 hour, the system was cooled to room temperature to solidify the paraffin. Then, a NaOH solution was added to the system to react with oleic acid exposed to the aqueous phase in the system, and after a certain period of reaction, the paraffin wax droplets were washed several times with deionized water to remove the excess NaOH. And finally, adding carbon tetrachloride to remove paraffin, and performing centrifugal separation to finally obtain amphiphilic Janus silicon dioxide nano particle powder.
0.3g of Janus silica nanoparticle powder was dispersed in 10mL of water to form a dispersion, and the dispersion was added to a mixed oil phase composed of 8mL of octadecane, 1mL of methyl methacrylate, 1mL of butyl acrylate, 0.01g of azobisisobutyronitrile, and 0.002g of divinylbenzene, followed by emulsification at 2800rpm for 3min using a homogenizer. The emulsion was then poured into a flask, heated to 80 ℃ and allowed to react for 3h with stirring. The product was then filtered and washed to give the final phase change microcapsule product powder.
Fig. 3 shows a scanning electron microscope image of the phase-change microcapsule 1, the phase-change microcapsule is in a spherical structure and is completely coated, fig. 4 shows a differential scanning calorimetry diagram of the phase-change microcapsule 1, the phase-change enthalpy of the phase-change microcapsule material is 182.8J/g, and the phase-change enthalpy value is high, which indicates that the amphiphilic Janus silica nanoparticle powder has a high octadecane coating rate. Fig. 5 shows a thermogravimetric curve of the phase-change microcapsule 1, which is excellent in thermal stability, and a differential diagram thereof.
In another embodiment of the present invention, the present invention provides a phase change microcapsule 2: 8g of stearic acid and 200mL of absolute ethanol were added to the single-neck flask. The flask was placed in a thermostatic water bath at 20 ℃. The electric stirring apparatus was turned on, and the rotation speed was set to 300 rpm. Then 10g of nanosilica was added to the system. After 8 hours, the product was filtered and the oleic acid-modified nanosilica particles were washed 3 times with chloroform to remove free oleic acid and then dried in vacuo at 20 ℃. The modified SiO2 powder is obtained after treatment.
20g of paraffin wax was added to a 100mL single-neck flask, and the system was maintained at 70 ℃ to completely melt the paraffin wax. 5g of modified SiO2 powder and 100mL of deionized water were added to the flask, which was continuously stirred at 300 rpm. After 1 hour, the system was cooled to room temperature to solidify the paraffin. Then, a NaOH solution was added to the system to react with stearic acid exposed to the aqueous phase in the system, and after a certain period of reaction, the paraffin wax droplets were washed several times with deionized water to remove the excess NaOH. And finally, adding carbon tetrachloride to remove paraffin, and performing centrifugal separation to finally obtain amphiphilic Janus silicon dioxide nano particle powder.
0.4g of Janus silica nanoparticle powder was dispersed in 10mL of water to form a dispersion, and the dispersion was added to a mixed oil phase composed of 8mL of octadecane, 1mL of methyl methacrylate, 1mL of butyl acrylate, 0.01g of azobisisobutyronitrile, and 0.002g of divinylbenzene, followed by emulsification at 2800rpm for 3min using a homogenizer. The emulsion was then poured into a flask, heated to 80 ℃ and allowed to react for 3h with stirring. The product was then filtered and washed to give the final phase change microcapsule product powder.
In another embodiment of the present invention, the present invention provides a phase change microcapsule 3: first, 2.0g polyvinylpyrrolidone and 0.3g 2, 2-azobisisobutylamidine hydrochloride were added to 100mL deionized water in a three-necked flask with mechanical stirring under nitrogen atmosphere. Thereafter, a mixture of 10.0g of styrene and 0.05g of divinylbenzene was added to the aqueous solution to achieve a homogeneous emulsion before polymerization. Then, the reaction was carried out at a rate of 150rpm at 70 ℃ for 24 hours. In a 50mL flask, 3.75g of CPS latex was added to 18mL of ethanol and deionized water solution with constant magnetic stirring. The pH of the dispersion was adjusted to 14.0 using 5mol/L NaOH solution. Then, 1.0mL of 3-mercaptopropyltriethoxysilane was quickly added to the flask and the reaction was held at 50 ℃ for 3 h. Finally, Janus particles are prepared, and through post-treatment steps of washing, centrifuging and the like, Janus particle powder is finally obtained.
0.3g of the Janus particle powder was dispersed in 10mL of water to form a dispersion, and the dispersion was added to a mixed oil phase composed of 8mL of octadecane, 1mL of methyl methacrylate, 1mL of butyl acrylate, 0.01g of azobisisobutyronitrile, and 0.002g of divinylbenzene, followed by emulsification at 2800rpm for 3min with a homogenizer. The emulsion was then poured into a flask, heated to 80 ℃ and allowed to react for 3h with stirring. The product was then filtered and washed to give the final phase change microcapsule product powder.
In another embodiment of the present invention, the present invention provides a phase change microcapsule 4: first, 2.0g polyvinylpyrrolidone and 0.3g 2, 2-azobisisobutylamidine hydrochloride were added to 100mL deionized water in a three-necked flask with mechanical stirring under nitrogen atmosphere. Thereafter, a mixture of 10.0g of styrene and 0.05g of divinylbenzene was added to the aqueous solution to achieve a homogeneous emulsion before polymerization. Then, the reaction was carried out at a rate of 150rpm at 70 ℃ for 24 hours. 3.75g of CPS latex was added to 18mL of ethanol and deionized water solution in a 50mL flask with constant magnetic stirring. The pH of the dispersion was adjusted to 14.0 using 5mol/L NaOH solution. Then, 1.0mL of 3-mercaptopropyltriethoxysilane was quickly added to the flask and the reaction was held at 50 ℃ for 3 h. Finally, Janus particles are prepared, and through post-treatment steps of washing, centrifuging and the like, Janus particle powder is finally obtained.
0.5g of Janus silica nanoparticle powder was dispersed in 10mL of water to form a dispersion, and the dispersion was added to a mixed oil phase composed of 8mL of octadecane, 1mL of methyl methacrylate, 1mL of butyl acrylate, 0.01g of azobisisobutyronitrile, and 0.002g of divinylbenzene, followed by emulsification at 2800rpm for 3min using a homogenizer. The emulsion was then poured into a flask, heated to 80 ℃ and allowed to react for 3h with stirring. The product was then filtered and washed to give the final phase change microcapsule product powder.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value. The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A phase change microcapsule comprising:
a capsule core, which is a hydrophobic material with solid/liquid phase change in the temperature range of 0-70 ℃;
an intermediate layer located at the outer periphery of the capsule core, wherein the intermediate layer is selected from any one of polymers, inorganic substances, organic substances and organic-inorganic hybrid materials;
and an outer layer located at a peripheral portion of the intermediate layer, the outer layer being a hybrid particle whose surface includes a hydrophilic region and a hydrophobic region, the hybrid particle exhibiting both hydrophilicity and hydrophobicity.
2. The phase-change microcapsule according to claim 1, wherein said hydrophobic material is selected from any one of tetradecane, hexadecane, octadecane, docosane, stearic acid, tetradecanol, hexadecanol, and octadecanol.
3. The phase-change microcapsule according to claim 1, wherein said intermediate layer is a polymeric material obtained by polymerizing:
10-90 wt% of a first monomer;
0.1 to 1 weight percent of a second monomer comprising a multifunctional monomer;
0.1 to 0.2 wt% of an initiator;
the first monomer, the second monomer and the initiator are obtained by free radical polymerization in an aqueous phase system.
4. The phase change microcapsule of claim 1, wherein the surface of the hybrid particle comprises a plurality of functional groups selected from the group consisting of hydroxyl, mercaptopropyl, methyl, propyl, aminopropyl, epoxy, monoamino, diamino, polyether, alicyclic epoxy, thiol, carboxyl, hydrogen, methacrylic, phenolic, alkoxy, ester, alkyl, fluoroalkyl, diol, monoalkylamino, dialkylamino, aryloxy, acyloxy, alkylcarbonyl, aryl, alkenyl, substituted and unsubstituted alkynyl, cycloalkyl, ether, anilino, amide, mercapto, aldehyde, alkenyl, alkynyl, acrylic, acryloxy, methacryloxy, cyano and isocyano groups.
5. Phase change microcapsules according to claim 4 characterized in that the hybrid particles have a particle size of 30-1000 nm.
6. A phase change microcapsule, comprising:
a capsule core, which is a hydrophobic material with solid/liquid phase change in the temperature range of 0-70 ℃;
an intermediate layer located at an outer peripheral portion of the capsule core;
an outer layer located at a peripheral portion of the intermediate layer, the outer layer being a hybrid particle whose surface includes a hydrophilic region and a hydrophobic region, the hybrid particle exhibiting both hydrophilicity and hydrophobicity;
the middle layer is a polymer film layer obtained by crosslinking and polymerizing acrylate monomers in the presence of the capsule core and the outer layer.
7. A method for preparing a phase change microcapsule, comprising the steps of:
providing a capsule core, wherein the capsule core is made of a hydrophobic material with solid/liquid phase change in a temperature range of 0-70 ℃;
an intermediate layer formed on the outer periphery of the capsule core, the intermediate layer being a polymer material;
and an outer layer formed on a peripheral portion of the intermediate layer, the outer layer being a hybrid particle whose surface includes a hydrophilic region and a hydrophobic region, the hybrid particle exhibiting both hydrophilicity and hydrophobicity.
8. The method for preparing phase-change microcapsules according to claim 7, comprising the steps of:
providing a hybrid particle, and dispersing the hybrid particle in water to form an aqueous dispersion;
adding a first monomer, a second monomer, an initiator and a hydrophobic material into the aqueous dispersion, and mixing to form a pre-emulsion;
polymerizing the pre-emulsion to obtain the phase change microcapsule.
9. The method for preparing phase-change microcapsules of claim 7, wherein the concentration of the aqueous dispersion containing hybrid particles is 0.1-20 wt.%.
10. The method for preparing phase-change microcapsules according to claim 7, wherein the mixing rate is 1000-3000 rpm.
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| CN111774017A (en) * | 2020-07-10 | 2020-10-16 | 清华大学 | Phase change microcapsule based on polymer shell and manufacturing method thereof |
| CN112724336A (en) * | 2020-12-30 | 2021-04-30 | 王海涛 | Preparation method of core-shell type polymer microsphere encapsulated with functional core material |
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| CN111621265A (en) * | 2020-07-10 | 2020-09-04 | 清华大学 | Phase change microcapsule based on inorganic shell layer and manufacturing method and application thereof |
| CN111774017A (en) * | 2020-07-10 | 2020-10-16 | 清华大学 | Phase change microcapsule based on polymer shell and manufacturing method thereof |
| CN111621265B (en) * | 2020-07-10 | 2021-10-29 | 清华大学 | Phase change microcapsule based on inorganic shell layer and manufacturing method and application thereof |
| CN112724336A (en) * | 2020-12-30 | 2021-04-30 | 王海涛 | Preparation method of core-shell type polymer microsphere encapsulated with functional core material |
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Application publication date: 20200814 |