CN114523534A - Preparation method of anisotropic heat-conducting phase-change energy-storage wood - Google Patents
Preparation method of anisotropic heat-conducting phase-change energy-storage wood Download PDFInfo
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- CN114523534A CN114523534A CN202210185562.2A CN202210185562A CN114523534A CN 114523534 A CN114523534 A CN 114523534A CN 202210185562 A CN202210185562 A CN 202210185562A CN 114523534 A CN114523534 A CN 114523534A
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- 239000002023 wood Substances 0.000 title claims abstract description 112
- 238000004146 energy storage Methods 0.000 title claims abstract description 67
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000003094 microcapsule Substances 0.000 claims abstract description 38
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 30
- RZJRJXONCZWCBN-UHFFFAOYSA-N octadecane Chemical compound CCCCCCCCCCCCCCCCCC RZJRJXONCZWCBN-UHFFFAOYSA-N 0.000 claims abstract description 20
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910001431 copper ion Inorganic materials 0.000 claims abstract description 15
- 229920000877 Melamine resin Polymers 0.000 claims abstract description 10
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000004202 carbamide Substances 0.000 claims abstract description 10
- OPQARKPSCNTWTJ-UHFFFAOYSA-L copper(ii) acetate Chemical compound [Cu+2].CC([O-])=O.CC([O-])=O OPQARKPSCNTWTJ-UHFFFAOYSA-L 0.000 claims abstract description 10
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims description 27
- 238000005470 impregnation Methods 0.000 claims description 24
- 229920000147 Styrene maleic anhydride Polymers 0.000 claims description 22
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- 239000008367 deionised water Substances 0.000 claims description 21
- 229910021641 deionized water Inorganic materials 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 239000000725 suspension Substances 0.000 claims description 12
- 239000000839 emulsion Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 8
- PYSRRFNXTXNWCD-UHFFFAOYSA-N 3-(2-phenylethenyl)furan-2,5-dione Chemical compound O=C1OC(=O)C(C=CC=2C=CC=CC=2)=C1 PYSRRFNXTXNWCD-UHFFFAOYSA-N 0.000 claims description 7
- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 claims description 7
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 7
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 7
- 229960001484 edetic acid Drugs 0.000 claims description 7
- 229910001379 sodium hypophosphite Inorganic materials 0.000 claims description 7
- 230000001804 emulsifying effect Effects 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims 15
- 239000010949 copper Substances 0.000 abstract description 18
- 229910052802 copper Inorganic materials 0.000 abstract description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 15
- 239000000463 material Substances 0.000 abstract description 11
- 238000005338 heat storage Methods 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 150000004699 copper complex Chemical class 0.000 abstract description 4
- 230000007704 transition Effects 0.000 abstract description 4
- 239000011162 core material Substances 0.000 abstract description 3
- 239000000835 fiber Substances 0.000 abstract description 3
- 238000011065 in-situ storage Methods 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 3
- 230000002194 synthesizing effect Effects 0.000 abstract 1
- 239000012071 phase Substances 0.000 description 54
- 210000004027 cell Anatomy 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- 238000000724 energy-dispersive X-ray spectrum Methods 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 2
- 239000012782 phase change material Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000011232 storage material Substances 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 210000003850 cellular structure Anatomy 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000002362 energy-dispersive X-ray chemical map Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/02—Processes; Apparatus
- B27K3/08—Impregnating by pressure, e.g. vacuum impregnation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/34—Organic impregnating agents
- B27K3/50—Mixtures of different organic impregnating agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/52—Impregnating agents containing mixtures of inorganic and organic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
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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
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Forests & Forestry (AREA)
- Wood Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
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- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The invention discloses a preparation method of anisotropic heat-conducting phase change energy storage wood, which comprises the steps of synthesizing a microcapsule wall material by taking melamine, urea and formaldehyde as raw materials, preparing phase change microcapsules by taking n-octadecane as a core material, impregnating the phase change microcapsules into wood, drying and curing in vacuum to obtain the phase change energy storage wood, impregnating the phase change energy storage wood in a copper acetate solution, and impregnating the phase change energy storage wood in vacuum for the second time, so that the phase change microcapsules can be successfully impregnated into the wood and are mainly distributed in a guide pipe of the wood. According to the invention, after the copper complex is reduced in the wood, the wood cell cavities are effectively filled with the microcapsules coated by the copper, and no obvious interface transition area exists between the wood and the copper, so that the wood and the copper have good compatibility, copper ions are deposited in situ in the wood conduit and the fiber, the wood is endowed with excellent heat storage and energy storage capacity and anisotropic high heat conductivity, and the efficient utilization and qualitative transmission of heat energy are realized.
Description
Technical Field
The invention relates to the field of application of novel energy storage materials, in particular to a preparation method of anisotropic heat-conducting phase-change energy storage wood.
Background
With the increasingly exhaustion of global energy crisis and the increasingly serious environmental problems such as greenhouse effect, ozone layer holes and the like caused by over-development and use of energy, people pay more attention to the development of green and low-carbon building energy-saving materials. The phase change energy storage material is a substance which changes the physical state of the material along with the change of the environmental temperature so as to absorb or release a large amount of latent heat, and the temperature of the material is kept unchanged, so that the material is an excellent green energy-saving material, and is widely applied to the fields of energy conservation, solar energy development, electronic equipment and the like. Phase change materials are mainly classified into solid-liquid, solid-solid, and liquid-vapor phase change materials according to a phase change state, and the solid-liquid phase change materials have advantages of high latent heat, appropriate temperature, and the like compared with other two types, and thus are most widely used. But the existing phase change energy storage wood also has the problems of poor heat storage and energy storage capacity, poor anisotropic high heat conductivity, and incapability of efficiently utilizing and qualitatively transmitting heat energy,
disclosure of Invention
The invention aims to provide a preparation method of anisotropic heat-conducting phase-change energy-storage wood. The phase change energy storage wood prepared by the invention has excellent heat storage and energy storage capacity and anisotropic high heat conductivity, and can realize high-efficiency utilization and qualitative transmission of heat energy.
The technical scheme of the invention is as follows: a preparation method of anisotropic heat conduction phase change energy storage wood comprises the following steps:
step one, mixing 5-10 parts of melamine, 5-10 parts of urea, 25-35 parts of formaldehyde and 25-35 parts of deionized water according to parts by mass, adding triethanolamine to adjust the pH value to 8-9, and heating at 75-85 ℃ for 20-40 minutes to obtain a prepolymer;
step two, dissolving 5-15 parts of styrene-maleic anhydride copolymer and 1-5 parts of NaOH in 80-90 parts of deionized water by mass, and heating at 75-85 ℃ for 40-80 minutes to obtain a yellow transparent SMA solution;
step three, adding 7-15 parts of SMA solution and 5-10 parts of n-octadecane by mass into the prepolymer in the step two, and emulsifying at 7000 rpm of 5000-;
step four, heating the phase-change emulsion at 40-60 ℃ for 20-40 minutes, and then heating to 60-80 ℃ for 2-3 hours to obtain a phase-change microcapsule suspension;
step five, putting the wood into the phase change microcapsule suspension for vacuum impregnation for 20-40 minutes, and drying to obtain the phase change energy storage wood;
step six, dissolving 5-8 parts of copper acetate, 4-6 parts of sodium hypophosphite and 15-17 parts of ethylene diamine tetraacetic acid in 40-60 parts of deionized water by mass, and adjusting the pH value to 8.5-9.5 to obtain a copper ion impregnation solution;
and step seven, placing the phase change energy storage wood into copper ion impregnation liquid, performing vacuum impregnation for 20-30 hours, and heating at the temperature of 100-140 ℃ for 40-60 hours to obtain a finished product.
In the first step of the preparation method of the anisotropic heat conduction phase change energy storage wood, 7.7 parts of melamine, 7.4 parts of urea, 29.9 parts of formaldehyde and 30 parts of deionized water are mixed according to parts by mass, triethanolamine is added to adjust the pH value to 8.5-9, and the mixture is heated at 80 ℃ for 30 minutes.
In the second step of the preparation method of the anisotropic heat conduction phase change energy storage wood, 10 parts by mass of styrene-maleic anhydride copolymer and 3 parts by mass of NaOH are dissolved in 87 parts by mass of deionized water, and the mixture is heated at 80 ℃ for 60 minutes.
In the third step, 9 parts of SMA solution and 8 parts of n-octadecane are added into the prepolymer according to the mass parts, and the mixture is emulsified for 30 minutes at 6000 rpm.
In the fourth step of the preparation method of the anisotropic heat conduction phase change energy storage wood, the phase change emulsion is heated at 50 ℃ for 30 minutes, and then heated to 70 ℃ for 2.5 hours.
In the fifth step of the preparation method of the anisotropic heat conduction phase change energy storage wood, the wood with the length, the width and the height of 20, 20 and 20mm is placed into the phase change microcapsule suspension for vacuum impregnation for 30 minutes, and the phase change energy storage wood is obtained after drying.
In the sixth step of the preparation method of the anisotropic heat conduction phase change energy storage wood, 7.2 parts by mass of copper acetate, 5.1 parts by mass of sodium hypophosphite and 16.2 parts by mass of ethylenediamine tetraacetic acid are dissolved in 50 parts by mass of deionized water, and the pH value is adjusted to 9.
In the seventh step of the preparation method of the anisotropic heat conduction phase change energy storage wood, the phase change energy storage wood is placed in the copper ion impregnation liquid, vacuum impregnation is carried out for 24 hours, and then heating is carried out at 120 ℃ for 48 hours.
Compared with the prior art, the invention synthesizes the microcapsule wall material by taking melamine, urea and formaldehyde as raw materials, prepares the phase change microcapsule by taking n-octadecane as the core material, soaks the phase change microcapsule into wood, dries and solidifies in vacuum to obtain the phase change energy storage wood, soaks the phase change energy storage wood into copper acetate solution, soaks in vacuum for the second time, can make the phase change microcapsule soak into wood successfully, and is mainly distributed in the conduit of the wood. According to the invention, after the copper complex is reduced in the wood, the wood cell cavities are effectively filled with the microcapsules coated by the copper, and no obvious interface transition area exists between the wood and the copper, so that the wood and the copper have good compatibility, copper ions are deposited in situ in the wood conduit and the fiber, the wood is endowed with excellent heat storage and energy storage capacity and anisotropic high heat conductivity, and the efficient utilization and qualitative transmission of heat energy are realized. In addition, the invention further optimizes the ratio of various parameters, so that the invention has better phase change energy storage capacity.
Drawings
FIG. 1 is a schematic cross-section of a wood;
FIG. 2 is a schematic view of a radial section of wood;
FIG. 3 is a schematic cross-sectional view of a phase change energy storage wood;
FIG. 4 is a schematic view of a radial section of phase change energy storage wood;
FIG. 5 is a cross-sectional view of the phase change energy storage wood;
FIG. 6 is a schematic cross-sectional view of an anisotropic heat-conducting phase-change energy-storing wood;
FIG. 7 is a schematic view of a radial section of anisotropic heat-conducting phase-change energy-storing wood;
FIG. 8 is a partial enlarged view of a radial section of the anisotropic heat-conducting phase-change energy-storing wood;
FIG. 9 is a schematic illustration of the range of diameters of phase change microcapsules;
FIG. 10 is an EDX spectrum of Cu element distribution;
fig. 11 is an N element distribution EDX map.
Detailed Description
The present invention is further described with reference to the following drawings and examples, but the invention is not limited thereto, and the scope of the invention should include the full contents of the claims, and the invention can be more fully understood by those skilled in the art through the following examples.
The experimental methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.
Example 1: a preparation method of anisotropic heat conduction phase change energy storage wood comprises the following steps:
step one, mixing 7g of melamine, 8g of urea, 28g of formaldehyde and 35ml of deionized water according to the mass parts, adding triethanolamine to adjust the pH value to 8.5-9, and heating at 80 ℃ for 35 minutes to obtain a prepolymer;
step two, dissolving 8g of styrene-maleic anhydride copolymer (SMA) and 2g of NaOH in 90ml of deionized water according to parts by mass, and heating at 80 ℃ for 70 minutes to obtain a yellow transparent SMA solution;
step three, adding 10g of SMA solution and 8g of n-octadecane into the prepolymer in the step two according to the mass parts, and emulsifying for 35 minutes at 6500 r/min to obtain phase-change emulsion;
step four, heating the phase-change emulsion at 55 ℃ for 25 minutes, and then heating to 75 ℃ for 3 hours to obtain a phase-change microcapsule suspension;
putting the wood with the length, the width and the height of 20 multiplied by 20mm into the phase change microcapsule suspension for vacuum impregnation for 35 minutes, and drying to obtain the phase change energy storage wood;
step six, dissolving 7g of copper acetate, 4.5g of sodium hypophosphite and 15.8g of ethylene diamine tetraacetic acid in 55ml of deionized water according to parts by mass, and adjusting the pH value to 9 to obtain a copper ion impregnation solution;
and seventhly, putting the phase change energy storage wood into the copper ion impregnation liquid, vacuum impregnating for 28 hours, and heating for 55 hours at 135 ℃ to obtain a finished product.
Example 2: a preparation method of anisotropic heat conduction phase change energy storage wood comprises the following steps:
step one, mixing 9g of melamine, 6.5g of urea, 32g of formaldehyde and 28ml of deionized water according to the mass parts, adding triethanolamine to adjust the pH value to 8.5-9, and heating at 78 ℃ for 35 minutes to obtain a prepolymer;
step two, dissolving 12g of styrene-maleic anhydride copolymer (SMA) and 3g of NaOH in 85ml of deionized water according to parts by mass, and heating at 82 ℃ for 65 minutes to obtain a yellow transparent SMA solution;
step three, adding 8g of SMA solution and 10g of n-octadecane into the prepolymer in the step two according to the mass parts, and emulsifying at 5500 revolutions per minute for 40 minutes to obtain phase-change emulsion;
step four, heating the phase-change emulsion at 50 ℃ for 35 minutes, and then heating to 65 ℃ for 2.5 hours to obtain a phase-change microcapsule suspension;
putting the wood with the length, the width and the height of 20 multiplied by 20mm into the phase change microcapsule suspension for vacuum impregnation for 30 minutes, and drying to obtain the phase change energy storage wood;
step six, dissolving 6.8g of copper acetate, 5.5g of sodium hypophosphite and 16.5g of ethylene diamine tetraacetic acid in 50ml of deionized water according to parts by mass, and adjusting the pH value to 9 to obtain a copper ion impregnation solution;
and seventhly, putting the phase change energy storage wood into the copper ion impregnation liquid, vacuum impregnating for 30 hours, and heating at 115 ℃ for 45 hours to obtain a finished product.
Example 3: a preparation method of anisotropic heat conduction phase change energy storage wood comprises the following steps:
step one, mixing 7.7g of melamine, 7.4g of urea, 29.9g of formaldehyde and 30ml of deionized water according to the mass parts, adding triethanolamine to adjust the pH value to 8.5-9, and heating at 80 ℃ for 30 minutes to obtain a prepolymer;
step two, dissolving 10g of styrene-maleic anhydride copolymer (SMA) and 3g of NaOH in 87ml of deionized water according to parts by mass, and heating for 60 minutes at 80 ℃ to obtain a yellow transparent SMA solution;
step three, adding 9g of SMA solution and 8g of n-octadecane into the prepolymer in the step two according to the mass parts, and emulsifying for 30 minutes at 6000 revolutions per minute to obtain phase-change emulsion;
step four, heating the phase-change emulsion at 50 ℃ for 30 minutes, and then heating to 70 ℃ for 2.5 hours to obtain a phase-change microcapsule suspension;
putting the wood with the length, the width and the height of 20 multiplied by 20mm into the phase change microcapsule suspension for vacuum impregnation for 30 minutes, and drying to obtain the phase change energy storage wood;
step six, dissolving 7.2g of copper acetate, 5.1g of sodium hypophosphite and 16.2g of ethylene diamine tetraacetic acid in 50ml of deionized water according to parts by mass, and adjusting the pH value to 9 to obtain a copper ion impregnation solution;
and seventhly, putting the phase change energy storage wood into the copper ion impregnation liquid, vacuum impregnating for 24 hours, and heating at 120 ℃ for 48 hours to obtain a finished product.
Taking the most preferred finished product of example 3 as an example, the applicant performs SEM observation of the cross section and the radial section of the wood, the phase change energy storage wood and the finished product (anisotropic heat conduction phase change energy storage wood) during the preparation process to obtain a schematic view of the cross section of the wood as shown in fig. 1, a schematic view of the radial section of the wood as shown in fig. 2, a schematic view of the cross section of the phase change energy storage wood as shown in fig. 3, a schematic view of the radial section of the phase change energy storage wood as shown in fig. 4, a partial enlarged view of the cross section of the phase change energy storage wood as shown in fig. 5, a schematic view of the cross section of the anisotropic heat conduction phase change energy storage wood as shown in fig. 6, a schematic view of the radial section of the anisotropic heat conduction phase change energy storage wood as shown in fig. 7, and a partial enlarged view of the radial section of the anisotropic heat conduction phase change energy storage wood as shown in fig. 8. As can be seen from the above figures, wood is a porous material with a cellular structure and a rich channel structure (fig. 1 and 2), and has the potential to be a carrier for phase change materials. After the impregnation treatment, the microcapsules were successfully impregnated into the wood (fig. 3 and 4) and distributed mainly in the ducts of the wood. Fig. 5 shows that spherical phase-change microcapsules are uniformly distributed in the wood cell cavity, while applicants have counted the range of diameters of phase-change microcapsules, as shown in fig. 9. From FIG. 9, it can be seen that the diameter of the phase-change microcapsule ranges from 0 to 10 μm, wherein 0 to 2 μm is 16%, 2 to 5 μm is 53%, and 5 to 10 μm is 31%, which is much smaller than the pore size of the wood cell cavity, which indicates that the phase-change microcapsule of the present invention can be well inside the wood. Further, as can be seen from fig. 6-8, the present invention shows good compatibility between wood and copper by effectively filling the wood cell cavities with copper-coated microcapsules after reducing the copper complex inside the wood, and no obvious interfacial transition zone between wood and copper. Fig. 8 shows an enlarged view of the longitudinal section of the anisotropic heat-conducting phase-change energy storage wood, wherein the microcapsules are uniformly dispersed in the copper layer, and the copper layer and the microcapsule structure are clearly distinguished, which shows that the microcapsules after the impregnation treatment are still intact and no leakage occurs. In addition, the applicant also performed element component statistics, as shown in table 1:
| element(s) | Weight (%) | Atom (%) |
| C | 26.6 | 37.47 |
| N | 5.05 | 6.1 |
| O | 48.32 | 51.1 |
| CuK | 20.04 | 5.34 |
TABLE 1
Simultaneously, EDX spectrum observation is carried out, an EDX spectrum with Cu element distribution shown in figure 10 and an EDX spectrum with N element distribution shown in figure 11 are obtained, element distribution and proportion of Cu and N on the cross section of the anisotropic heat conduction phase change energy storage wood can be clearly seen from the table 1 and the EDX spectra, and the uniform distribution rule of copper and microcapsules in the wood is revealed to be consistent with the result shown in figure 6.
In conclusion, the invention synthesizes the microcapsule wall material by taking melamine, urea and formaldehyde as raw materials, prepares the phase change microcapsule by taking n-octadecane as the core material, soaks the phase change microcapsule into wood, dries and solidifies in vacuum to obtain the phase change energy storage wood, soaks the phase change energy storage wood into the copper acetate solution, soaks in vacuum for the second time, can make the phase change microcapsule soak into wood successfully, and is mainly distributed in the conduit of wood. According to the invention, after the copper complex is reduced in the wood, the wood cell cavities are effectively filled with the microcapsules coated by the copper, and no obvious interface transition area exists between the wood and the copper, so that the wood and the copper have good compatibility, copper ions are deposited in situ in the wood conduit and the fiber, the wood is endowed with excellent heat storage and energy storage capacity and anisotropic high heat conductivity, and the efficient utilization and qualitative transmission of heat energy are realized.
Claims (8)
1. A preparation method of anisotropic heat conduction phase change energy storage wood is characterized by comprising the following steps: the method comprises the following steps:
step one, mixing 5-10 parts of melamine, 5-10 parts of urea, 25-35 parts of formaldehyde and 25-35 parts of deionized water according to parts by mass, adding triethanolamine to adjust the pH value to 8-9, and heating at 75-85 ℃ for 20-40 minutes to obtain a prepolymer;
step two, dissolving 5-15 parts of styrene-maleic anhydride copolymer and 1-5 parts of NaOH in 80-90 parts of deionized water by mass, and heating at 75-85 ℃ for 40-80 minutes to obtain a yellow transparent SMA solution;
step three, adding 7-15 parts of SMA solution and 5-10 parts of n-octadecane by mass into the prepolymer in the step two, and emulsifying at 7000 rpm of 5000-;
step four, heating the phase-change emulsion at 40-60 ℃ for 20-40 minutes, and then heating to 60-80 ℃ for 2-3 hours to obtain a phase-change microcapsule suspension;
step five, putting the wood into the phase change microcapsule suspension for vacuum impregnation for 20-40 minutes, and drying to obtain the phase change energy storage wood;
step six, dissolving 5-8 parts of copper acetate, 4-6 parts of sodium hypophosphite and 15-17 parts of ethylene diamine tetraacetic acid in 40-60 parts of deionized water by mass, and adjusting the pH value to 8.5-9.5 to obtain a copper ion impregnation solution;
and step seven, placing the phase change energy storage wood into copper ion impregnation liquid, performing vacuum impregnation for 20-30 hours, and heating at the temperature of 100-140 ℃ for 40-60 hours to obtain a finished product.
2. The method for preparing the anisotropic heat conduction phase change energy storage wood according to claim 1, wherein the method comprises the following steps: in the first step, 7.7 parts of melamine, 7.4 parts of urea, 29.9 parts of formaldehyde and 30 parts of deionized water are mixed according to the mass parts, triethanolamine is added to adjust the pH value to 8.5-9, and the mixture is heated at 80 ℃ for 30 minutes.
3. The method for preparing the anisotropic heat conduction phase change energy storage wood according to claim 1, wherein the method comprises the following steps: in the second step, 10 parts by mass of a styrene-maleic anhydride copolymer and 3 parts by mass of NaOH were dissolved in 87 parts by mass of deionized water, and heated at 80 ℃ for 60 minutes.
4. The method for preparing the anisotropic heat conduction phase change energy storage wood according to claim 1, wherein the method comprises the following steps: in the third step, 9 parts of SMA solution and 8 parts of n-octadecane are added into the prepolymer according to the mass parts, and the mixture is emulsified for 30 minutes at 6000 revolutions per minute.
5. The method for preparing the anisotropic heat conduction phase change energy storage wood according to claim 1, wherein the method comprises the following steps: in the fourth step, the phase change emulsion is heated at 50 ℃ for 30 minutes and then heated to 70 ℃ for 2.5 hours.
6. The method for preparing the anisotropic heat conduction phase change energy storage wood according to claim 1, wherein the method comprises the following steps: and step five, putting the wood with the length multiplied by the width multiplied by the height of 20 multiplied by 20mm into the phase change microcapsule suspension for vacuum impregnation for 30 minutes, and drying to obtain the phase change energy storage wood.
7. The method for preparing the anisotropic heat conduction phase change energy storage wood according to claim 1, wherein the method comprises the following steps: in the sixth step, 7.2 parts by mass of copper acetate, 5.1 parts by mass of sodium hypophosphite and 16.2 parts by mass of ethylenediaminetetraacetic acid are dissolved in 50 parts by mass of deionized water, and the pH is adjusted to 9.
8. The method for preparing the anisotropic heat conduction phase change energy storage wood according to claim 1, wherein the method comprises the following steps: and step seven, putting the phase change energy storage wood into the copper ion impregnation liquid, vacuum impregnating for 24 hours, and heating at 120 ℃ for 48 hours.
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