CN112812750B - Application of silane coupling agent in new energy storage material and new solar energy heat supply system - Google Patents
Application of silane coupling agent in new energy storage material and new solar energy heat supply system Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 37
- 239000011232 storage material Substances 0.000 title claims abstract description 31
- 239000006087 Silane Coupling Agent Substances 0.000 title claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 150000001875 compounds Chemical class 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 51
- 229910021389 graphene Inorganic materials 0.000 claims description 48
- 239000004964 aerogel Substances 0.000 claims description 22
- 239000012188 paraffin wax Substances 0.000 claims description 15
- 239000012782 phase change material Substances 0.000 claims description 10
- 238000012986 modification Methods 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000004108 freeze drying Methods 0.000 claims description 3
- 238000006722 reduction reaction Methods 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 238000001338 self-assembly Methods 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 25
- 238000012546 transfer Methods 0.000 abstract description 4
- 239000012071 phase Substances 0.000 description 23
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 11
- 239000000463 material Substances 0.000 description 11
- 239000002131 composite material Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical group C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- 125000004432 carbon atom Chemical group C* 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 239000008367 deionised water Substances 0.000 description 4
- 229910021641 deionized water Inorganic materials 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
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- 229910052736 halogen Inorganic materials 0.000 description 3
- 125000005843 halogen group Chemical group 0.000 description 3
- 238000005338 heat storage Methods 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 2
- 150000001335 aliphatic alkanes Chemical class 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
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- 229920001721 polyimide Polymers 0.000 description 2
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- 238000001157 Fourier transform infrared spectrum Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 125000003342 alkenyl group Chemical group 0.000 description 1
- 125000003302 alkenyloxy group Chemical group 0.000 description 1
- 125000003545 alkoxy group Chemical group 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 125000004104 aryloxy group Chemical group 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
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- NJSUFZNXBBXAAC-UHFFFAOYSA-N ethanol;toluene Chemical compound CCO.CC1=CC=CC=C1 NJSUFZNXBBXAAC-UHFFFAOYSA-N 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 238000001595 flow curve Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- -1 graphite alkene Chemical class 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 239000000017 hydrogel Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000012074 organic phase Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
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- 239000002244 precipitate Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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- 238000001179 sorption measurement Methods 0.000 description 1
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- 125000001424 substituent group Chemical group 0.000 description 1
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- 231100000331 toxic Toxicity 0.000 description 1
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D15/00—Other domestic- or space-heating systems
- F24D15/02—Other domestic- or space-heating systems consisting of self-contained heating units, e.g. storage heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
-
- 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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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
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Abstract
Disclosed is the use of a silane coupling agent in energy storage materials and new solar energy heating systems, wherein the silane coupling agent is selected from the compounds represented by formula (1). The new energy storage material has better heat conductivity and higher latent heat of phase change; and the heat and mass transfer efficiency of the new energy storage material is improved compared with the prior art. In addition, the new energy storage material has better stability and is not easy to leak.
Description
Technical Field
The invention belongs to the technical field of solar energy; relates to the application of a silane coupling agent in a new energy storage material and a new solar energy heating system.
Background
With the development of global economy, the energy demand is increasing day by day, and the problem of energy exhaustion is gradually highlighted. The environmental pollution problem caused by the traditional fossil energy is also becoming more serious, and the development and utilization of new energy are becoming the key points of research in various countries. Among various new energy sources, solar energy has the advantages of cleanness, no pollution, sustainability and the like. However, the breadth of our country is broad, and especially in the vast western and northern regions, the solar energy resource is abundant, and the solar energy resource has considerable development potential.
However, due to the influence of factors such as weather, geography, illumination time and the like, solar energy has the defects of low energy storage density, discontinuity and the like, and cannot provide continuous and stable high-density energy, so that the application and development of the solar energy are greatly restricted. In order to increase the utilization of solar energy, it is often necessary to use energy storage devices to store the heat collected by the solar energy.
Among the energy storage devices, the most widely used core material is a phase change energy storage material. Phase change materials are mainly classified into organic, inorganic and composite phase change materials according to their chemical compositions. In the field of medium and low temperature phase change heat storage of solar heating and storage, organic phase change materials such as alkanes, fatty acids and polyols are mostly researched. Among them, paraffin is typically used as the alkane.
The paraffin is colorless, nontoxic and free of pungent smell, stable in physical and chemical properties, large in heat storage density, free of supercooling, low in vapor pressure and widely applied to the field of medium and low temperature phase change heat storage. However, paraffin has the disadvantages of poor heat conductivity, large volume expansion coefficient, poor stability, easy leakage and the like.
Chinese patent application CN105733516A discloses a composite phase change film material based on graphene and a preparation method thereof. In the preparation method, the graphene oxide aqueous solution with a certain concentration is continuously extruded at a constant speed from a preparation device with a linear outlet, enters a solidification liquid, and is put into liquid nitrogen for quick freezing. And then, obtaining a graphene oxide aerogel film through freeze drying, sending the graphene oxide aerogel film into a high-temperature furnace for high-temperature 1300-3000 ℃ heat treatment in an inert atmosphere, then soaking the graphene oxide aerogel film in dichloromethane solutions of paraffin with different concentrations, and fully absorbing the solution to obtain the graphene-based composite phase change film material. The graphene composite phase-change film material has an excellent paraffin packaging effect, the paraffin filling amount is 0.1-99.9%, the film-paraffin composite is uniform, and after multiple heating and cooling cycles, the melting phase-change enthalpy and the solidification phase-change enthalpy of the material basically keep unchanged, so that efficient heat energy storage is realized. However, this patent application uses the dichloromethane solution of graphite alkene aerogel and paraffin to carry out compound, and dichloromethane volatilizees and can lead to compound phase change membrane material to appear a large amount of holes to it is more to lead to its heat conduction efficiency and heat accumulation density to descend. Meanwhile, methylene dichloride is used as a toxic reagent in the patent application, and potential danger is caused to human bodies and the environment.
Chinese patent application CN110804420A discloses a phase change composite material based on a high-thermal-conductivity anisotropic graphene framework and a preparation method thereof, wherein ethanol is introduced into a water system for directional freezing to ensure that graphene sheets are regularly arranged, polyimide is introduced into a graphene three-dimensional network and graphitized to connect the graphene sheets so as to reduce contact thermal resistance, interface thermal resistance and phonon scattering caused by defects of the graphene thermal-conductive network, the obtained three-dimensional graphene framework has excellent thermal conductivity, and the phase change composite material obtained by compounding with the phase change material has high thermal conductivity and high phase change latent heat. The preparation process disclosed by the patent application is safe, environment-friendly and pollution-free, is suitable for mass production, solves the problem that the low filling content and the high thermal conductivity of the conventional phase-change composite material cannot be simultaneously met, and obtains the efficient energy storage material. However, in the preparation method of this patent application, the graphene aerogel needs to be graphitized at a high temperature in a graphitization furnace after the imidization reaction, and the high temperature is preferably 2800 ℃. At the high temperature, polyimide is easy to thermally degrade, so that a pre-constructed graphene three-dimensional network has certain defects, the improvement of the heat-conducting property of the phase-change material is influenced, and the latent heat of phase change is reduced more than that of pure paraffin due to the factors such as mass fraction of graphene and pore distribution of aerogel. This leads to inefficient heat and mass transfer of the energy storage material.
On the other hand, as an energy storage material of a solar new energy heating system, the material also needs to have certain stability, that is, the energy storage material should avoid the problems of leakage and the like in the using process, and if not, the material will cause the performance reduction and even failure of the phase change energy storage material, and the problem that the surrounding environment is polluted and the like is seriously caused.
The inventors have found that the above problems can be preferably solved when a specific silane coupling agent is used in a new energy storage material and a new solar energy heating system.
Disclosure of Invention
The invention aims to provide application of a silane coupling agent in new energy storage materials. The invention also aims to provide the application of the silane coupling agent in a solar new energy heating system. The new energy storage material has better heat conductivity and higher latent heat of phase change; and the heat and mass transfer efficiency of the new energy storage material is improved compared with the prior art. In addition, the new energy storage material has better stability and is not easy to leak.
In order to achieve the purpose, the invention provides application of a silane coupling agent in an energy storage material, wherein the energy storage material takes graphene aerogel as a carrier and takes paraffin as a phase change material; the graphene aerogel is prepared from graphene oxide by adopting chemical reduction self-assembly and freeze drying; the graphene oxide is selected from graphene oxide modified by a silane coupling agent; characterized in that the silane coupling agent is selected from compounds represented by formula (1),
wherein A represents a divalent, trivalent or tetravalent organic group of 2 to 50 carbon atoms; l represents an organic group having 1 to 10 carbon atoms; R1-R3 each independently represent a hydrogen atom, an alkyl or alkoxy group of 1-10 carbon atoms optionally substituted by halogen, an alkenyl or alkenyloxy group of 2-10 carbon atoms optionally substituted by halogen, an aryl or aryloxy group of 5-10 carbon atoms optionally substituted by halogen.
The use according to the invention, wherein the silane coupling agent is selected from compounds represented by formula (2),
wherein B represents a cyclic unit fused with an imido ring, and L and R1 to R3 are as described above.
The use according to the invention, wherein the silane coupling agent is selected from compounds represented by formula (3),
wherein R4 to R7 each independently represents a hydrogen atom or a substituent, and L and R1 to R3 are as described above.
The use according to the invention, wherein the silane coupling agent is selected from compounds represented by formula (4),
the application of the invention is that the weight ratio of graphene oxide to silane coupling agent is 1: (1.5-2.5).
The use according to the invention, wherein the modification conditions are: the reaction temperature is 60-80 ℃, and the reaction time is 12-48 h.
The application of the graphene aerogel provided by the invention is characterized in that the graphene aerogel is further subjected to heat treatment at the temperature of 250-350 ℃.
The application is further applied to a solar new energy heating system.
The invention has the beneficial effects that: compared with the prior art, when the specific silane coupling agent is used in the new energy storage material and the new solar energy heating system, the new energy storage material has better heat conductivity and is increased to more than 3 times of the pure phase change material; meanwhile, the latent heat of phase change is higher and is at least more than 85 percent of that of the pure phase change material. In addition, after the energy storage new material undergoes multiple cold and hot cycles, the energy storage new material has better stability and is not easy to leak.
Without wishing to be bound by any theory, the use of the specific silane coupling agents of the present invention improves the above-mentioned properties of new energy storage materials.
Detailed Description
The present invention will be further described with reference to the following examples, which are not intended to limit the scope of the invention. Unless otherwise indicated, percentages in the examples are uniformly percentages by mass.
Example 1
(1) Modification of graphene oxide: mixing 200mg of graphene oxide (synthesized by Hummers method of Beijing Deke island gold technologies Co., Ltd.) with 100mL of deionized water, and performing ultrasonic treatment for 2 hours to form a uniform graphene oxide dispersion liquid; dropwise adding a mixed solution of anhydrous ethanol-toluene (volume ratio is 1:1) containing 400mg of silane coupling agent gamma-phthalimidopropyltrimethoxysilane (CAS: 154717-09-6) into the graphene oxide dispersion liquid under stirring; after the addition, the pH was adjusted to 5.0 using acetic acid. Then reacted at 70 ℃ for 24 hours, cooled to room temperature, centrifuged, and the precipitate was washed 3 times each with anhydrous ethanol and deionized water to remove unreacted silane coupling agent. And drying in vacuum to obtain modified graphene oxide powder.
FT-IR spectrum shows that the modified graphene oxide powder is increased by 2960cm compared with unmodified graphene oxide-1(CH3)、2890cm-1(CH2)、1740cm-1(-C＝O)、1600cm-1(benzene ring-H) 1465cm-1(benzene ring-H), 1050cm-1(Si-O-C) and the like, indicating that the modified GO powder is grafted with the silane coupling agent.
(2) Preparing the graphene aerogel: adding 60mg of modified graphene oxide powder into 12mL of deionized water, and carrying out ultrasonic treatment for 0.5h to form a uniform modified graphene oxide dispersion liquid. And (3) injecting 100 mu L of Ethylenediamine (EDA) into the modified graphene oxide dispersion liquid, and reacting at 90 ℃ for 12h to obtain the graphene hydrogel. The graphene hydrosol was washed 3 times each with anhydrous ethanol and deionized water. Pre-freezing the graphene hydrosol at-20 ℃ for 12h, then placing the pre-frozen graphene hydrosol in a freeze dryer, and carrying out vacuum drying for 24h to obtain the graphene aerogel.
(3) And (3) heat treatment of the graphene aerogel: and (2) placing the graphene aerogel in a tube furnace, heating the graphene aerogel to 300 ℃ from room temperature at a heating rate of 2 ℃/min in a nitrogen atmosphere, then preserving heat for 6 hours, and then cooling to room temperature, wherein the cooling rate is the same as the heating rate, so that the heat-treated graphene aerogel is obtained.
(4) Preparing a phase change energy storage material: the graphene aerogel is used as a carrier, the paraffin is used as a phase-change material, and the weight ratio of the graphene aerogel to the paraffin is 1: 9. and heating the phase change material to a molten state, adding graphene aerogel, and carrying out vacuum adsorption for 2 h. And cooling to room temperature to obtain the phase change energy storage material.
Comparative example 1
Step (3) is not carried out; the other conditions were the same as in example 1.
Comparative example 2
KH550 is used as the silane coupling agent in the step (1); the other conditions were the same as in example 1.
Testing of Material Properties
The thermal conductivity and latent heat of phase change and relative percentage of the phase change energy storage materials obtained in example 1 and comparative examples 1 to 2 and pure paraffin were measured and calculated, respectively.
Wherein, the heat conductivity coefficient is measured and calculated by adopting a TC3200 heat conductivity coefficient instrument. The instrument adopts the principle of a transient hot wire method, and the measurement range is 0.001-20W/(mK). The latent heat of phase change was measured using a DSC-Q20 differential scanning calorimeter. The test temperature is-10 to 80 ℃, the temperature rising and reducing speed is 10 ℃/min, the nitrogen purging flow rate is 40mL/min, and the phase change latent heat of the material is obtained from the obtained heat flow curve by utilizing the self-contained analysis software of the instrument.
The results are shown in table 1 below.
TABLE 1
| Thermal conductivity (W/(mK)) | Latent heat of phase change (J/g) | Relative percentage (%) | |
| Example 1 | 0.967 | 172.6 | 88.1 |
| Comparative example 1 | 0.620 | 153.9 | 78.5 |
| Comparative example 2 | 0.524 | 141.5 | 72.2 |
| Pure paraffin wax | 0.318 | 196.1 | 100 |
As can be seen from Table 1, the new energy storage material of example 1 of the present application has better heat conductivity; meanwhile, the latent heat of phase change is higher; and the heat and mass transfer efficiency of the new energy storage material is improved compared with the prior art.
Further, the phase change energy storage materials of example 1 and comparative examples 1 to 2 were placed on a glass plate, and the glass plate was placed in a drying oven at 80 ℃, kept for 10min, taken out, cooled to room temperature, and recorded as a cooling-heating cycle. The thermal conductivities of the phase change energy storage materials of example 1 and comparative examples 1-2 were measured again after 100 repetitions, and the thermal conductivities of the three were respectively equivalent to 94.2%, 71.8% and 83.5% of the values in table 1.
It should be understood that the detailed description of the invention is merely illustrative of the spirit and principles of the invention and is not intended to limit the scope of the invention. Furthermore, it should be understood that various changes, substitutions, deletions, modifications or adjustments may be made by those skilled in the art after reading the disclosure of the present invention, and such equivalents are also within the scope of the invention as defined in the appended claims.
Claims (2)
1. The application of the silane coupling agent in the energy storage material takes graphene aerogel as a carrier and takes paraffin as a phase change material; the graphene aerogel is prepared from graphene oxide by adopting chemical reduction self-assembly and freeze drying; the graphene oxide is selected from graphene oxide modified by a silane coupling agent; characterized in that the silane coupling agent is selected from compounds represented by formula (4),
wherein the weight ratio of the graphene oxide to the silane coupling agent is 1: (1.5-2.5);
the modification conditions are as follows: the reaction temperature is 60-80 ℃, and the reaction time is 12-48 h;
the graphene aerogel is further subjected to heat treatment at the temperature of 250-350 ℃.
2. Use according to claim 1, further in a solar new energy heating system.
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| CN101775140A (en) * | 2010-01-15 | 2010-07-14 | 南昌大学 | Class of super heat-resistant imide aromatic heterocyclic modified silane coupling agent |
| CN101910318A (en) * | 2008-01-28 | 2010-12-08 | 东丽株式会社 | Siloxane resin compositions |
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