CN116814223B - Modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion and preparation method thereof - Google Patents
Modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion and preparation method thereof Download PDFInfo
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- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical class N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 title claims abstract description 111
- 230000008859 change Effects 0.000 title claims abstract description 88
- 150000003839 salts Chemical class 0.000 title claims abstract description 87
- 239000000463 material Substances 0.000 title claims abstract description 74
- 239000012074 organic phase Substances 0.000 title claims abstract description 68
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 238000001484 Pickering emulsion method Methods 0.000 title description 2
- 239000000839 emulsion Substances 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 229910052582 BN Inorganic materials 0.000 claims abstract description 41
- 238000002156 mixing Methods 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000001132 ultrasonic dispersion Methods 0.000 claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 18
- 238000000498 ball milling Methods 0.000 claims abstract description 17
- 238000004945 emulsification Methods 0.000 claims abstract description 17
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 claims abstract description 16
- 229930006000 Sucrose Natural products 0.000 claims abstract description 16
- 239000005720 sucrose Substances 0.000 claims abstract description 16
- 238000005406 washing Methods 0.000 claims abstract description 13
- 230000033444 hydroxylation Effects 0.000 claims abstract description 3
- 238000005805 hydroxylation reaction Methods 0.000 claims abstract description 3
- PODWXQQNRWNDGD-UHFFFAOYSA-L sodium thiosulfate pentahydrate Chemical compound O.O.O.O.O.[Na+].[Na+].[O-]S([S-])(=O)=O PODWXQQNRWNDGD-UHFFFAOYSA-L 0.000 claims description 41
- 239000012188 paraffin wax Substances 0.000 claims description 36
- 238000010438 heat treatment Methods 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 16
- -1 hydroxyl modified boron nitride Chemical class 0.000 claims description 14
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 7
- BDKLKNJTMLIAFE-UHFFFAOYSA-N 2-(3-fluorophenyl)-1,3-oxazole-4-carbaldehyde Chemical compound FC1=CC=CC(C=2OC=C(C=O)N=2)=C1 BDKLKNJTMLIAFE-UHFFFAOYSA-N 0.000 claims description 6
- 235000021355 Stearic acid Nutrition 0.000 claims description 6
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 6
- 229940093430 polyethylene glycol 1500 Drugs 0.000 claims description 6
- 235000017281 sodium acetate Nutrition 0.000 claims description 6
- 229940087562 sodium acetate trihydrate Drugs 0.000 claims description 6
- 239000008117 stearic acid Substances 0.000 claims description 6
- 238000004108 freeze drying Methods 0.000 claims description 4
- GLDOVTGHNKAZLK-UHFFFAOYSA-N octadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCCCO GLDOVTGHNKAZLK-UHFFFAOYSA-N 0.000 claims description 4
- 238000005119 centrifugation Methods 0.000 claims description 2
- DGLRDKLJZLEJCY-UHFFFAOYSA-L disodium hydrogenphosphate dodecahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].OP([O-])([O-])=O DGLRDKLJZLEJCY-UHFFFAOYSA-L 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- GOQYKNQRPGWPLP-UHFFFAOYSA-N n-heptadecyl alcohol Natural products CCCCCCCCCCCCCCCCCO GOQYKNQRPGWPLP-UHFFFAOYSA-N 0.000 claims description 2
- 229940056211 paraffin Drugs 0.000 claims description 2
- 229940113125 polyethylene glycol 3000 Drugs 0.000 claims description 2
- RSIJVJUOQBWMIM-UHFFFAOYSA-L sodium sulfate decahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].[O-]S([O-])(=O)=O RSIJVJUOQBWMIM-UHFFFAOYSA-L 0.000 claims description 2
- 229960004274 stearic acid Drugs 0.000 claims description 2
- 229940012831 stearyl alcohol Drugs 0.000 claims description 2
- 238000009210 therapy by ultrasound Methods 0.000 claims description 2
- 239000012782 phase change material Substances 0.000 abstract description 14
- 230000004580 weight loss Effects 0.000 abstract description 2
- 239000006185 dispersion Substances 0.000 abstract 1
- 239000012071 phase Substances 0.000 description 46
- 238000005979 thermal decomposition reaction Methods 0.000 description 31
- 239000008367 deionised water Substances 0.000 description 20
- 229910021641 deionized water Inorganic materials 0.000 description 20
- 239000012065 filter cake Substances 0.000 description 20
- 230000007704 transition Effects 0.000 description 20
- 238000005338 heat storage Methods 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 10
- 238000001914 filtration Methods 0.000 description 10
- 239000006228 supernatant Substances 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000002351 wastewater Substances 0.000 description 5
- 229920002535 Polyethylene Glycol 1500 Polymers 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 230000001804 emulsifying effect Effects 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- VUYXVWGKCKTUMF-UHFFFAOYSA-N tetratriacontaethylene glycol monomethyl ether Chemical compound COCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCO VUYXVWGKCKTUMF-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 239000003995 emulsifying agent Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- DNIAPMSPPWPWGF-UHFFFAOYSA-N monopropylene glycol Natural products CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 2
- 238000005191 phase separation Methods 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000004781 supercooling Methods 0.000 description 2
- FKOKUHFZNIUSLW-UHFFFAOYSA-N 2-Hydroxypropyl stearate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(C)O FKOKUHFZNIUSLW-UHFFFAOYSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- NWGKJDSIEKMTRX-AAZCQSIUSA-N Sorbitan monooleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O NWGKJDSIEKMTRX-AAZCQSIUSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- QHFQAJHNDKBRBO-UHFFFAOYSA-L calcium chloride hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].[Cl-].[Ca+2] QHFQAJHNDKBRBO-UHFFFAOYSA-L 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 238000003760 magnetic stirring Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- ZPIRTVJRHUMMOI-UHFFFAOYSA-N octoxybenzene Chemical compound CCCCCCCCOC1=CC=CC=C1 ZPIRTVJRHUMMOI-UHFFFAOYSA-N 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 229940093625 propylene glycol monostearate Drugs 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
- C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
- C09K5/066—Cooling mixtures; De-icing compositions
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Colloid Chemistry (AREA)
Abstract
The invention belongs to the field of phase change material preparation methods, and particularly relates to a modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion and a preparation method thereof. The emulsion comprises the following components in percentage by mass: 0.1-4wt% of hydroxylation modified boron nitride, 20-45wt% of organic phase change material and 55-80wt% of hydrated salt. Mixing boron nitride powder and sucrose, ball milling, washing and other process steps to obtain hydroxylated modified boron nitride; adding an organic phase change material, and performing ultrasonic dispersion to obtain a component A; and adding the hydrated salt, and performing ultrasonic emulsification by using a cell crusher to obtain the modified boron nitride stable hydrated salt/organic phase change material Pickering emulsion. The invention improves the initial temperature of thermal weight loss of the hydrated salt, overcomes the problem of free water volatilization after the hydrated salt is melted, and improves the dispersion stability and heat conducting property of the material.
Description
Technical Field
The invention belongs to the field of phase change material preparation methods, and particularly relates to a modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion and a preparation method thereof.
Background
The phase change material is an important energy material and is widely applied to the aspects of battery thermal management, solar energy heat utilization, building energy storage, residential heating and the like. Phase change refers to the change of a substance from one aggregation state to another, whereas the phase change process is typically an isothermal process, accompanied by a large amount of energy release and absorption. The energy absorbed or released by a substance during a phase change is called the latent heat of phase change (enthalpy). Phase change materials have the advantages of high phase change enthalpy, low cost, light weight, good thermal stability and the like, and therefore, have received wide attention in thermal management systems. However, the low thermal conductivity of phase change materials greatly limits their heat dissipation performance in thermal management applications.
With the rapid development of modern industry and the improvement of living standard of people, not only a great deal of resources on the earth, such as coal, petroleum and the like, are consumed, but also serious damage and pollution are caused to the environment. Untreated caustic sludge wastewater is high-salt wastewater discharged from a refinery, and can cause water pollution, thereby seriously threatening the health of human beings and other organisms. The alkaline residue wastewater contains sodium ions, magnesium ions, sulfate ions and the like, and part of salt substances can be extracted for recycling. Sodium thiosulfate pentahydrate, for example, is a hydrated inorganic salt phase change material with a high phase change enthalpy. The hydrated salt is extracted from the wastewater and developed into a phase change material, so that the problem of high salt of the wastewater can be solved, the application of the hydrated salt in the fields of power battery thermal management and the like can be expanded, the application of the technology is helpful for reducing greenhouse gas emission in China, and technical support is provided for achieving the aim of carbon emission reduction. However, hydrated inorganic salts have problems of large supercooling degree, easy phase separation, thermal instability, low thermal conductivity, and the like, and limit practical applications thereof. The shaping phase change material is prepared by compounding the hydrated salt and a porous adsorption material (such as expanded graphite, graphite foam and the like), so that the problems of high supercooling degree, easy phase separation and low heat conductivity of the hydrated salt can be effectively solved. Although effective, free water produced by hydrated salts after endothermic phase changes is volatile, resulting in reduced heat storage capacity after multiple cycles.
The Chinese patent No. 109337653B discloses a segmented heat storage composite phase change material and a preparation method thereof, wherein Span 80, propylene glycol monostearate, propylene glycol fatty acid ester, ethylene glycol fatty acid ester and polyethylene glycol octyl phenyl ether are mainly adopted as emulsifying agents, hydrated salts such as calcium chloride hexahydrate and the like are adopted as disperse phases, organic phase change materials such as paraffin and the like are adopted as continuous phases, water-in-oil segmented heat storage phase change emulsion is obtained under the condition of magnetic stirring, and the phase change latent heat of the composite phase change heat storage material is 162.7-204.7J/g. The invention focuses on adopting a conventional emulsifier to increase the contact surface of the hydrated salt and the organic phase change material and reduce the free energy of an interface, so as to prepare the segmented heat storage composite phase change emulsion. However, the conventional emulsion has low heat conductivity coefficient and low emulsifying capacity under high temperature condition, and the application field is greatly limited; in addition, the patent of the invention does not relate to the influence of the prepared sectional heat storage phase change material on the thermal decomposition temperature and the thermal decomposition enthalpy value of the hydrated salt, and the total heat storage capacity of the material needs to be improved.
As a two-dimensional material, hexagonal boron nitride (h-BN) is known for its excellent thermal conductivity properties, which makes it possible to use it in combination with phase change materials in electronic systems to improve the thermal management and performance of the system. The hexagonal boron nitride structure is similar to graphite, has alternate boron (B) and nitrogen (N) atoms instead of carbon (C) atoms, has the advantages of high heat conductivity, good electrical insulation property, large specific surface area and the like, is inert to various chemicals, is not easy to cause chemical reaction, and is particularly suitable for battery packaging application. If the nano material with high heat conductivity and good heat stability is used as the stabilizer to prepare the reverse Pickering emulsion of the hydrated salt/organic phase change material, the problem of easy volatilization of free water generated after the phase change of the hydrated salt (< 100 ℃) is hopefully solved, and the heat conductivity of the emulsion is improved, so that the Pickering emulsion with two performances of low-temperature Duan Qianre heat storage (< 100 ℃) and high-temperature thermal decomposition heat storage (> 100 ℃) is obtained.
Therefore, we propose a modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion and a preparation method thereof.
Disclosure of Invention
The invention aims to provide a modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion and a preparation method thereof, so as to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme:
a preparation method of modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion comprises the following steps:
s1: mixing boron nitride powder and sucrose, and performing ball milling, washing, ultrasonic treatment, centrifugation and freeze drying to obtain hydroxylated modified boron nitride;
s2: mixing the hydroxyl modified boron nitride prepared in the step S1 with an organic phase change material, heating in a water bath to a temperature 5-20 ℃ higher than the melting point of the organic phase change material, uniformly mixing, and performing ultrasonic dispersion to obtain a uniform mixture, wherein the uniform mixture is denoted as a component A;
s3: mixing the hydrated salt with the component A, heating in water bath until the temperature is consistent with the temperature of the component A, and performing ultrasonic emulsification after uniformly mixing to obtain the modified boron nitride stable hydrated salt/organic phase change material Pickering emulsion.
In the technical scheme, the phase change process and the thermal decomposition process of the modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion occur at two different temperatures, the phase change occurs between the low-temperature Duan Shuige salt and the organic phase change material, the phase change enthalpy value is 103.5-260.6J/g, the thermal decomposition occurs between the high-temperature hydrated salt, and the thermal decomposition enthalpy value is 228.4-580.4J/g; wherein, boron nitride is used as a stabilizer, so that the hydrated salt is uniformly dispersed in the organic phase-change material as a dispersed phase, and the organic phase-change material is used as a continuous phase, thus effectively preventing the agglomeration and precipitation of the hydrated salt, and improving the stability and controllability of the material.
Further, the diameter of the boron nitride powder in the step S1 is 3-45 μm.
Further, in the step S1, the mass ratio of the boron nitride powder to sucrose is 1: (3-7).
Further, the ball milling process conditions in the step S1 are as follows: the rotation speed of the ball mill is 400-600rpm, and the ball milling time is 8-14h; the ultrasonic process conditions are as follows: the ultrasonic power is 500-750W, and the ultrasonic time is 20-60min; the centrifugal process conditions are as follows: centrifugal speed is 2000-7500rpm, and centrifugal time is 5-30min; the freeze drying time is 30-60h.
Further, the ultrasonic process conditions in the step S2 are as follows: the ultrasonic power is 500-750W, and the ultrasonic dispersion time is 5-15min.
Further, the ultrasonic emulsification process conditions in the step S3 are as follows: the ultrasonic emulsification power is 500-750W, and the ultrasonic emulsification time is 5-15min.
Further, the modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion comprises the following components in percentage by mass: 0.1-4wt% of hydroxylation modified boron nitride, 20-45wt% of organic phase change material and 55-80wt% of hydrated salt.
Further, the organic phase change material is one of paraffin, polyethylene glycol 1500, polyethylene glycol 3000, stearyl alcohol and stearic acid.
Further, the hydrated salt is one of sodium thiosulfate pentahydrate, sodium acetate trihydrate, disodium hydrogen phosphate dodecahydrate and sodium sulfate decahydrate.
Compared with the prior art, the invention has the following beneficial effects:
1. the modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion prepared by the invention has the advantages that both a disperse phase (hydrated salt) and a continuous phase (organic phase change material) play a role in phase change heat storage, and the phase change heat storage density is high.
2. The modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion prepared by the invention has two properties of low-temperature Duan Qianre heat storage (< 100 ℃) and high-temperature section thermal decomposition heat storage (> 100 ℃), the phase change latent heat storage in the low-temperature section is derived from the phase change of the hydrated salt and the organic phase change material, the phase change enthalpy value is 103.5-260.6J/g, the high-temperature section is derived from the thermal decomposition of the hydrated salt, and the thermal decomposition enthalpy value is 228.4-580.4J/g; the problem that free water generated after the hydrated salt is melted is at a low temperature Duan Huifa is solved, the hydrated salt has a higher thermal decomposition enthalpy value at a high temperature section, the problem that free water generated after the hydrated salt is melted as a phase change material is at a low temperature Duan Huifa is solved, and the higher thermal decomposition enthalpy value of the hydrated salt at the high temperature section can be fully utilized to meet the high heat storage density requirements of different temperature sections.
3. The modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion prepared by the invention adopts the modified boron nitride with high heat conductivity coefficient as a stabilizer, so that the initial temperature of the thermal weight loss of the hydrated salt is improved, the problem of volatilization of low-temperature free water is solved, and the heat conductivity of the Pickering emulsion is improved.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a DSC of a modified boron nitride stabilized hydrated salt/organic phase change material reverse Pickering emulsion prepared in example 1, example 2, example 3 of the present invention;
FIG. 2 is a reverse Pickering emulsion TG plot of modified boron nitride stabilized hydrated salts/organic phase change materials prepared in example 1, example 2, example 3 of the present invention;
FIG. 3 is a DSC chart of a reverse Pickering emulsion of modified boron nitride stabilized hydrated salt/organic phase change material prepared in example 4, example 5, example 6, example 7, example 8 of the present invention;
FIG. 4 is a reverse Pickering emulsion TG plot of modified boron nitride stabilized hydrated salt/organic phase change material prepared in examples 4, 5, 6, 7, 8 of the present invention;
FIG. 5 is a DSC graph of a reverse Pickering emulsion of the modified boron nitride stabilized hydrated salt/organic phase change material prepared in comparative example 1, comparative example 2 of the present invention;
FIG. 6 is a graph of reverse Pickering emulsion TG of modified boron nitride stabilized hydrated salt/organic phase change material prepared in comparative example 1, comparative example 2 of the present invention.
Detailed Description
The technical scheme of the invention is further specifically described below through specific embodiments and with reference to the accompanying drawings. In the present invention, all the equipment and raw materials are commercially available or commonly used in the industry, and the methods in the following examples are conventional in the art unless otherwise specified.
In order to provide a better understanding of the present application, those skilled in the art will now make further details of the present application with reference to the drawings and detailed description. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
The boron nitride powder in this example was hexagonal boron nitride with average diameters of 3 μm, 10 μm, 25 μm, 45 μm, supplied by Shanghai Ala Biochemical technologies Co., ltd; paraffin is 46-48, supplied by Shanghai Ala Biochemical technology Co., ltd; sucrose, sodium acetate trihydrate and sodium thiosulfate pentahydrate, manufactured by Shanghai Ala Biochemical technologies Co., ltd; polyethylene glycol 1500 (PEG 1500) is provided by national pharmaceutical group chemicals limited; stearic acid is supplied by Shanghai microphone Biochemical technologies Co.
Example 1: a preparation method of modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion comprises the following steps:
s1: mixing 2g of boron nitride powder (average diameter of 10 μm) and 10g of sucrose, and ball milling for 8 hours under the condition that the rotation speed of a ball mill is 600 rpm; adding deionized water for washing, vacuum filtering, and collecting a boron nitride filter cake; placing the boron nitride filter cake into a beaker, adding deionized water, and performing ultrasonic dispersion for 30min with 500W power by adopting a cell pulverizer; centrifuging at 6000rpm for 15min, collecting supernatant, and lyophilizing for 50 hr to obtain hydroxylated modified boron nitride;
s2: mixing 3g of paraffin and 0.2g of hydroxyl modified boron nitride by taking paraffin as an organic phase change material, heating in a water bath at 65 ℃ until the paraffin is completely melted, and performing ultrasonic dispersion for 10min at 600W power by adopting a cell pulverizer to obtain a component A;
s3: sodium thiosulfate pentahydrate is taken as a hydrated salt, 6.8g of sodium thiosulfate pentahydrate is mixed with the component A, the mixture is heated in a water bath at 65 ℃ until the sodium thiosulfate pentahydrate is completely melted, and a cell pulverizer is adopted to carry out ultrasonic emulsification for 10min at 600W power, so that the modified boron nitride stable sodium thiosulfate pentahydrate/paraffin Pickering emulsion is obtained.
Example 2: a preparation method of modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion comprises the following steps:
s1: mixing 2g of boron nitride powder (average diameter of 3 μm) and 10g of sucrose, and ball milling for 8 hours under the condition that the rotation speed of a ball mill is 600 rpm; adding deionized water for washing, vacuum filtering, and collecting a boron nitride filter cake; placing the boron nitride filter cake into a beaker, adding deionized water, and performing ultrasonic dispersion for 30min with 500W power by adopting a cell pulverizer; centrifuging at 6000rpm for 15min, collecting supernatant, and lyophilizing for 50 hr to obtain hydroxylated modified boron nitride;
s2: mixing 3g of polyethylene glycol 1500 (PEG 1500) and 0.2g of hydroxyl modified boron nitride by taking polyethylene glycol 1500 (PEG 1500) as an organic phase change material, heating in a water bath at 70 ℃ until the polyethylene glycol 1500 is completely melted, and performing ultrasonic dispersion for 10min at 600W power by adopting a cell pulverizer to obtain a component A;
s3: sodium thiosulfate pentahydrate is taken as a hydrated salt, 6.8g of sodium thiosulfate pentahydrate is mixed with the component A, the mixture is heated in a water bath at 70 ℃ until the sodium thiosulfate pentahydrate is completely melted, and a cell pulverizer is adopted to carry out ultrasonic emulsification for 10min at 600W power, so that the modified boron nitride stable sodium thiosulfate pentahydrate/polyethylene glycol 1500Pickering emulsion is obtained.
Example 3: a preparation method of modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion comprises the following steps:
s1: mixing 2g of boron nitride powder (average diameter of 10 μm) and 10g of sucrose, and ball milling for 8 hours under the condition that the rotation speed of a ball mill is 600 rpm; adding deionized water for washing, vacuum filtering, and collecting a boron nitride filter cake; placing the boron nitride filter cake into a beaker, adding deionized water, and performing ultrasonic dispersion for 30min with 500W power by adopting a cell pulverizer; centrifuging at 6000rpm for 15min, collecting supernatant, and lyophilizing for 50 hr to obtain hydroxylated modified boron nitride;
s2: mixing 3g of stearic acid and 0.2g of hydroxyl modified boron nitride by taking stearic acid as an organic phase change material, heating in a water bath at 80 ℃ until the stearic acid is completely melted, and performing ultrasonic dispersion for 10min by adopting a cell pulverizer at 600W power to obtain a component A;
s3: sodium thiosulfate pentahydrate is taken as a hydrated salt, 6.8g of sodium thiosulfate pentahydrate is mixed with the component A, the mixture is heated in a water bath at 80 ℃ until the sodium thiosulfate pentahydrate is completely melted, and the mixture is subjected to ultrasonic emulsification for 10min at 600W power by a cell pulverizer to obtain the modified boron nitride stable sodium thiosulfate pentahydrate/Pickering stearate emulsion.
Example 4: a preparation method of modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion comprises the following steps:
s1: mixing 2g of boron nitride powder (average diameter of 25 μm) and 10g of sucrose, and ball milling for 12 hours under the condition that the rotation speed of a ball mill is 600 rpm; adding deionized water for washing, vacuum filtering, and collecting a boron nitride filter cake; placing the boron nitride filter cake into a beaker, adding deionized water, and performing ultrasonic dispersion for 30min with 500W power by adopting a cell pulverizer; centrifuging at 5000rpm for 20min, collecting supernatant, and lyophilizing for 55 hr to obtain hydroxylated modified boron nitride;
s2: mixing 3g of paraffin and 0.01g of hydroxyl modified boron nitride by taking paraffin as an organic phase change material, heating in a water bath at 65 ℃ until the paraffin is completely melted, and performing ultrasonic dispersion for 10min at 600W power by adopting a cell pulverizer to obtain a component A;
s3: sodium thiosulfate pentahydrate is taken as a hydrated salt, 6.8g of sodium thiosulfate pentahydrate is mixed with the component A, the mixture is heated in a water bath at 65 ℃ until the sodium thiosulfate pentahydrate is completely melted, and a cell pulverizer is adopted to carry out ultrasonic emulsification for 10min at 600W power, so that the modified boron nitride stable sodium thiosulfate pentahydrate/paraffin Pickering emulsion is obtained.
Example 5: a preparation method of modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion comprises the following steps:
s1: mixing 1g of boron nitride powder (average diameter of 25 μm) and 6g of sucrose, and ball milling for 12 hours under the condition that the rotation speed of a ball mill is 600 rpm; adding deionized water for washing, vacuum filtering, and collecting a boron nitride filter cake; placing the boron nitride filter cake into a beaker, adding deionized water, and performing ultrasonic dispersion for 20min with 700W power by adopting a cell pulverizer; centrifuging at 5000rpm for 20min, collecting supernatant, and lyophilizing for 55 hr to obtain hydroxylated modified boron nitride;
s2: mixing 3g of paraffin and 0.05g of hydroxyl modified boron nitride by taking paraffin as an organic phase change material, heating in a water bath at 65 ℃ until the paraffin is completely melted, and performing ultrasonic dispersion for 10min at 600W power by adopting a cell pulverizer to obtain a component A;
s3: sodium thiosulfate pentahydrate is taken as a hydrated salt, 6.8g of sodium thiosulfate pentahydrate is mixed with the component A, the mixture is heated in a water bath at 65 ℃ until the sodium thiosulfate pentahydrate is completely melted, and the mixture is subjected to ultrasonic emulsification for 10min by using a cell pulverizer under the ultrasonic power of 600W to obtain the modified boron nitride stable sodium thiosulfate pentahydrate/paraffin Pickering emulsion.
Example 6: a preparation method of modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion comprises the following steps:
s1: mixing 2g of boron nitride powder (average diameter of 25 μm) and 12g of sucrose, and ball milling for 12 hours under the condition that the rotation speed of a ball mill is 600 rpm; adding deionized water for washing, vacuum filtering, and collecting a boron nitride filter cake; placing the boron nitride filter cake into a beaker, adding deionized water, and performing ultrasonic dispersion for 20min with 700W power by adopting a cell pulverizer; centrifuging at 5000rpm for 20min, collecting supernatant, and lyophilizing for 55 hr to obtain hydroxylated modified boron nitride;
s2: mixing 3g of paraffin and 0.1g of hydroxyl modified boron nitride by taking paraffin as an organic phase change material, heating in a water bath at 65 ℃ until the paraffin is completely melted, and performing ultrasonic dispersion for 10min at 600W power by adopting a cell pulverizer to obtain a component A;
s3: sodium thiosulfate pentahydrate is taken as a hydrated salt, 6.8g of sodium thiosulfate pentahydrate is mixed with the component A, the mixture is heated in a water bath at 65 ℃ until the sodium thiosulfate pentahydrate is completely melted, and a cell pulverizer is adopted to carry out ultrasonic emulsification for 10min at 600W power, so that the modified boron nitride stable sodium thiosulfate pentahydrate/paraffin Pickering emulsion is obtained.
Example 7: a preparation method of modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion comprises the following steps:
s1: mixing 2g of boron nitride powder (average diameter of 25 μm) and 12g of sucrose, and ball milling for 12 hours under the condition that the rotation speed of a ball mill is 600 rpm; adding deionized water for washing, vacuum filtering, and collecting a boron nitride filter cake; placing the boron nitride filter cake into a beaker, adding deionized water, and performing ultrasonic dispersion for 20min with 700W power by adopting a cell pulverizer; centrifuging at 5000rpm for 20min, collecting supernatant, and lyophilizing for 55 hr to obtain hydroxylated modified boron nitride;
s2: mixing 3g of paraffin and 0.2g of hydroxyl modified boron nitride by taking paraffin as an organic phase change material, heating in a water bath at 65 ℃ until the paraffin is completely melted, and performing ultrasonic dispersion for 10min at 600W power by adopting a cell pulverizer to obtain a component A;
s3: sodium thiosulfate pentahydrate is taken as a hydrated salt, 6.8g of sodium thiosulfate pentahydrate is mixed with the component A, the mixture is heated in a water bath at 65 ℃ until the sodium thiosulfate pentahydrate is completely melted, and a cell pulverizer is adopted to carry out ultrasonic emulsification for 10min at 600W power, so that the modified boron nitride stable sodium thiosulfate pentahydrate/paraffin Pickering emulsion is obtained.
Example 8: a preparation method of modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion comprises the following steps:
s1: mixing 2g of boron nitride powder (average diameter of 45 μm) and 10g of sucrose, and ball milling for 12 hours under the condition that the rotation speed of a ball mill is 600 rpm; adding deionized water for washing, vacuum filtering, and collecting a boron nitride filter cake; placing the boron nitride filter cake into a beaker, adding deionized water, and performing ultrasonic dispersion for 20min with 700W power by adopting a cell pulverizer; centrifuging at 5000rpm for 20min, collecting supernatant, and lyophilizing for 55 hr to obtain hydroxylated modified boron nitride;
s2: mixing 4g of paraffin and 0.2g of hydroxyl modified boron nitride by taking paraffin as an organic phase change material, heating in a water bath at 65 ℃ until the paraffin is completely melted, and performing ultrasonic dispersion for 10min at 600W power by adopting a cell pulverizer to obtain a component A;
s3: mixing 6.8g of sodium acetate trihydrate with the component A by taking sodium acetate trihydrate as a hydrated salt, heating in a water bath at 65 ℃ until sodium thiosulfate pentahydrate is completely melted, and performing ultrasonic emulsification for 10min by adopting a cell pulverizer at 600W power to obtain modified boron nitride stable sodium acetate trihydrate/paraffin Pickering emulsion.
Comparative example 1: a preparation method of modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion comprises the following steps:
s1: mixing 2g of boron nitride powder (average diameter of 45 μm) and 12g of sucrose, and ball milling for 14h under the condition that the rotation speed of a ball mill is 400 rpm; adding deionized water for washing, vacuum filtering, and collecting a boron nitride filter cake; placing the boron nitride filter cake into a beaker, adding deionized water, and performing ultrasonic dispersion for 20min with 700W power by adopting a cell pulverizer; centrifuging at 5000rpm for 20min, collecting supernatant, and lyophilizing for 45 hr to obtain hydroxylated modified boron nitride;
s2: mixing 3g of paraffin and 0.2g of hydroxyl modified boron nitride by taking paraffin as an organic phase change material, heating in a water bath at 65 ℃ until the paraffin is completely melted, and performing ultrasonic dispersion for 10min at 600W power by adopting a cell pulverizer to obtain a component A;
s3: mixing 6.8g of sodium thiosulfate pentahydrate with the component A by taking sodium thiosulfate pentahydrate as a hydrated salt, heating the mixture in a water bath at 65 ℃ until the sodium thiosulfate pentahydrate is completely melted, and stirring and emulsifying the mixture for 10 minutes by adopting a water bath magnetic stirrer at a speed of 1000rpm to obtain the modified boron nitride stable sodium thiosulfate pentahydrate/paraffin Pickering emulsion.
Comparative example 2: a preparation method of modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion comprises the following steps:
s1: mixing 1g of boron nitride powder (average diameter of 3 μm) and 6g of sucrose, and ball milling for 14h under the condition that the rotation speed of a ball mill is 400 rpm; adding deionized water for washing, vacuum filtering, and collecting a boron nitride filter cake; placing the boron nitride filter cake into a beaker, adding deionized water, and performing ultrasonic dispersion for 20min with 700W power by adopting a cell pulverizer; centrifuging at 5000rpm for 20min, collecting supernatant, and lyophilizing for 45 hr to obtain hydroxylated modified boron nitride;
s2: mixing 3g of paraffin and 0.2g of hydroxyl modified boron nitride by taking paraffin as an organic phase change material, heating in a water bath at 65 ℃ until the paraffin is completely melted, and performing ultrasonic dispersion for 10min at 600W power by adopting a cell pulverizer to obtain a component A;
s3: mixing 6.8g of sodium thiosulfate pentahydrate with the component A by taking sodium thiosulfate pentahydrate as a hydrated salt, heating the mixture in a water bath at 65 ℃ until the sodium thiosulfate pentahydrate is completely melted, and stirring and emulsifying the mixture for 10 minutes by adopting a water bath magnetic stirrer at a speed of 1200rpm to obtain the modified boron nitride stable sodium thiosulfate pentahydrate/paraffin Pickering emulsion.
Experiment
Taking modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion obtained in examples 1-8 and comparative examples 1-2, preparing samples, respectively detecting the performances of the samples and recording detection results:
the thermal characteristics of the prepared emulsion were measured using a simultaneous thermal analyzer, and the measurement results are shown in fig. 1 to 6 and tables 1 to 3.
Table 1 thermal properties of modified boron nitride stabilized hydrated salt/organic phase change material reverse Pickering emulsions prepared in examples 1, 2 and 3
Table 2 thermal characteristics of modified boron nitride stabilized hydrated salt/organic phase change material reverse Pickering emulsions prepared in examples 4, 5, 6, 7 and 8
Table 3 thermal characteristics of modified boron nitride stabilized hydrated salt/organic phase change material reverse Pickering emulsions prepared in comparative examples 1 and 2
From the data in the above table, the following conclusions can be clearly drawn:
1. as shown in Table 1, the phase transition temperature of example 1 was 50.1 ℃, the phase transition enthalpy was 182.7J/g, the thermal decomposition temperature was 176.8 ℃, the thermal decomposition enthalpy was 435.2J/g, and the residual mass percentage of the sample at 100 ℃ was 92.3wt%; the phase transition temperature of example 2 was 48.1 ℃, the phase transition enthalpy was 139.1J/g, the thermal decomposition temperature was 117.8 ℃, the thermal decomposition enthalpy was 228.4J/g, and the residual mass percentage of the sample at 100 ℃ was 85.9wt%; the phase transition temperature of example 3 was 47.4℃and the phase transition enthalpy was 103.5J/g, the thermal decomposition temperature was 125.2℃and the thermal decomposition enthalpy was 385.7J/g, the residual mass percentage of the sample at 100℃was 90.6wt%.
2. As shown in Table 2, the phase transition temperature of example 4 was 51.9 ℃, the phase transition enthalpy was 149.2J/g, the thermal decomposition temperature was 150.2 ℃, the thermal decomposition enthalpy was 103.2J/g, and the residual mass percentage of the sample at 100 ℃ was 95.5wt%; the phase transition temperature of example 5 was 49.3 ℃, the phase transition enthalpy was 215.3J/g, the thermal decomposition temperature was 125.0 ℃, the thermal decomposition enthalpy was 327.3J/g, and the residual mass percentage of the sample at 100 ℃ was 98.5wt%; the phase transition temperature of example 6 was 49.3 ℃, the phase transition enthalpy was 204.3J/g, the thermal decomposition temperature was 151.0 ℃, the thermal decomposition enthalpy was 580.4J/g, and the residual mass percentage of the sample at 100 ℃ was 93.3wt%; the phase transition temperature of example 7 was 50.1 ℃, the phase transition enthalpy was 182.7J/g, the thermal decomposition temperature was 176.8 ℃, the thermal decomposition enthalpy was 435.2J/g, and the residual mass percentage of the sample at 100 ℃ was 92.3wt%; example 8 phase transition temperature was 47.5 ℃, phase transition enthalpy was 255.7J/g, thermal decomposition temperature was 123.7 ℃, thermal decomposition enthalpy was 363.0J/g, and sample residual mass percentage was 98.2wt% at 100 ℃.
3. As shown in Table 3, comparative example 1 had a phase transition temperature of 48.9 ℃, a phase transition enthalpy of 260.6J/g, a thermal decomposition temperature of 136.2 ℃, a thermal decomposition enthalpy of 457.8J/g, and a residual mass percentage of 91.6wt% at 100 ℃; the phase transition temperature of comparative example 2 was 48.3 ℃, the phase transition enthalpy was 222.5J/g, the thermal decomposition temperature was 175.0 ℃, the thermal decomposition enthalpy was 475.3J/g, and the residual mass percentage of the sample at 100 ℃ was 91.9wt%.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process method article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process method article or apparatus.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A preparation method of modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion is characterized by comprising the following steps: the method comprises the following steps:
s1: mixing boron nitride powder and sucrose, and performing ball milling, washing, ultrasonic treatment, centrifugation and freeze drying to obtain hydroxylated modified boron nitride;
s2: mixing the hydroxyl modified boron nitride prepared in the step S1 with an organic phase change material, heating in a water bath to a temperature 5-20 ℃ higher than the melting point of the organic phase change material, uniformly mixing, and performing ultrasonic dispersion to obtain a uniform mixture, wherein the uniform mixture is denoted as a component A;
s3: mixing the hydrated salt with the component A, heating in a water bath until the temperature is consistent with the temperature of the component A, and performing ultrasonic emulsification after uniformly mixing to obtain modified boron nitride stable hydrated salt/organic phase change material Pickering emulsion;
in the step S1, the mass ratio of the boron nitride powder to the sucrose is 1: (3-7);
the modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion comprises the following components in percentage by mass: 0.1-4wt% of hydroxylation modified boron nitride, 20-45wt% of organic phase change material and 55-80wt% of hydrated salt;
the hydrated salt is one of sodium thiosulfate pentahydrate, sodium acetate trihydrate, disodium hydrogen phosphate dodecahydrate and sodium sulfate decahydrate;
the organic phase change material is one of paraffin, polyethylene glycol 1500, polyethylene glycol 3000, stearyl alcohol and stearic acid.
2. The method for preparing the modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion, which is disclosed in claim 1, is characterized in that: the diameter of the boron nitride powder in the step S1 is 3-45 mu m.
3. The method for preparing the modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion, which is disclosed in claim 1, is characterized in that: the ball milling process conditions in the step S1 are as follows: the rotation speed of the ball mill is 400-600rpm, and the ball milling time is 8-14h; the ultrasonic process conditions are as follows: the ultrasonic power is 500-750W, and the ultrasonic time is 20-60min; the centrifugal process conditions are as follows: centrifugal speed is 2000-7500rpm, and centrifugal time is 5-30min; the freeze drying time is 30-60h.
4. The method for preparing the modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion, which is disclosed in claim 1, is characterized in that: the ultrasonic process conditions in the step S2 are as follows: the ultrasonic dispersing power is 500-750W, and the ultrasonic dispersing time is 5-15min.
5. The method for preparing the modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion, which is disclosed in claim 1, is characterized in that: the ultrasonic emulsification process conditions in the step S3 are as follows: the ultrasonic emulsification power is 500-750W, and the ultrasonic emulsification time is 5-15min.
6. A modified boron nitride stable hydrated salt/organic phase change material reverse Pickering emulsion prepared by the method of any one of claims 1-5.
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