CN110872488A - Preparation method of lauric acid/porous carbonized wood composite phase change energy storage material - Google Patents
Preparation method of lauric acid/porous carbonized wood composite phase change energy storage material Download PDFInfo
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- CN110872488A CN110872488A CN201811009891.1A CN201811009891A CN110872488A CN 110872488 A CN110872488 A CN 110872488A CN 201811009891 A CN201811009891 A CN 201811009891A CN 110872488 A CN110872488 A CN 110872488A
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- 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
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Abstract
The invention relates to the field of heat transfer, heat exchange or heat storage materials, in particular to a preparation method of a lauric acid/porous carbonized wood composite phase change energy storage material, which comprises the following steps: 1) adding NaOH and Na into raw phoenix tree wood2SO3In the mixed solution of (1); 2) continuously boiling the solution obtained in the step 1) for 8-12h to remove lignin in the phoenix tree logs; 3) performing solid-liquid separation to obtain a solid product, and adding the solid product into deionized water to boil for 1 h; 4) drying the solid product treated in the step 3) for 8-12 h; 5) heating the solid product dried in the step 4) to obtain a porous carbonized wood matrix; 6) packaging lauric acid in the porous carbonized wood substrate obtained in the step 5) to obtain the lauric acid/porous carbonized wood composite phase change energy storage material. The heat storage capacity of the composite phase-change material is improved, and the application range is wider.
Description
Technical Field
The invention relates to the field of materials for heat transfer, heat exchange or heat storage, in particular to a preparation method of a lauric acid/porous carbonized wood composite phase change energy storage material.
Background
Lauric acid is a common organic phase change material, and has excellent phase change behavior, such as high latent heat (175-220J/g), negligible supercooling property, excellent chemical stability, high thermal stability (< 200 ℃), easy availability and low cost. Lauric acid is easily mixed with a porous material and can be retained in pores by capillary force and surface tension, thus causing great interest to researchers. However, it is reported that the composite phase change material prepared by lauric acid and porous materials such as kaolinite, sepiolite and expanded vermiculite shows excellent thermophysical performance, but has a plurality of disadvantages such as the limiting effect of the matrix on the phase change behavior of the lauric acid, lower packaging amount (30 wt.% to 70 wt.%) and the like. Therefore, a new matrix material is required to be found, so that the matrix material has the excellent performance of the composite phase-change material, the problem of the limiting effect of the matrix on the phase-change behavior of the phase-change material is solved, the heat storage capacity of the phase-change material is further increased, and the phase-change material is further applied to wider fields.
Aiming at the problems, the novel lauric acid/porous carbonized wood composite phase change energy storage material prepared by the invention has wide application prospect in the fields of furniture, building energy conservation and the like.
Disclosure of Invention
The invention provides a preparation method of a novel lauric acid/porous carbonized wood composite phase change material aiming at a plurality of research works of the existing composite phase change material. The invention has the advantages of low cost, light weight, no toxicity, high heat storage capacity, good circulation stability, simple preparation process and the like.
The specific technical scheme of the invention is as follows:
the invention provides a preparation method of a lauric acid/porous carbonized wood composite phase change energy storage material, which comprises the following steps:
1) adding NaOH and Na into raw phoenix tree wood2SO3In the mixed solution of (1);
2) continuously boiling the solution obtained in the step 1) for 8-12h to remove lignin in the phoenix tree logs;
3) performing solid-liquid separation to obtain a solid product, and adding the solid product into deionized water to boil for 1 h;
4) drying the solid product treated in the step 3) for 8-12 h;
5) heating the solid product dried in the step 4) to obtain a porous carbonized wood matrix;
6) packaging lauric acid in the porous carbonized wood substrate obtained in the step 5) to obtain the lauric acid/porous carbonized wood composite phase change energy storage material.
Preferably, the size of the phoenix tree log in step 1) is 35mm × 15mm × 5 mm; the addition amount of the NaOH is 8g, and the concentration is 2.5 mol/L; the Na is2SO3The amount of (2) was 5g, and the concentration was 0.5 mol/L.
Preferably, the deionized water described in step 3) is boiled to wash away residual impurities, which is repeated three times.
Preferably, the solid product in step 4) is freeze-dried in a vacuum freeze-dryer.
Preferably, the dried solid product in step 5) is heated in a high temperature tube furnace.
Preferably, the dried solid product in step 5) is heated: heating at 300 + -50 deg.C for 1-2h, and heating at 500 + -50 deg.C for 1-2 h.
Preferably, in step 5) N2And (4) reacting under protection.
Preferably, the porous carbonized wood matrix obtained in the step 6) is subjected to vacuum melting impregnation to encapsulate lauric acid, so that the lauric acid/porous carbonized wood composite phase change energy storage material is obtained.
Compared with the prior art, the invention has the advantages that:
a novel porous material, namely porous carbonized wood, is obtained through lignin treatment and carbonization treatment, so that the encapsulated lauric acid has larger encapsulation capacity (more than 80 wt.%), and compared with other matrix materials, the porous carbonized wood has smaller restriction effect on the phase change behavior of the lauric acid, thereby being beneficial to improving the heat storage capacity of the composite phase change material and widening the application range. And has the advantages of low cost, light weight, good circulation stability, no toxicity, simple preparation process and the like.
Drawings
FIG. 1 is an SEM image of a porous carbonized wood of the present invention;
FIG. 2 is an SEM image of a lauric acid/porous carbonized wood composite phase change material of the present invention;
fig. 3 is a DSC curve of the lauric acid and lauric acid/porous carbonized wood composite phase change material of the present invention.
FIG. 4 is an SEM image of a porous carbonized wood of the present invention;
FIG. 5 is SEM image of lauric acid/porous carbonized wood composite phase change material of the invention
Fig. 6 is a DSC curve of the lauric acid and lauric acid/porous carbonized wood composite phase change material of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples.
The invention prepares the lauric acid/porous carbonized wood composite phase-change material by the following method:
1. taking raw phoenix tree logs as raw materials, adding 2.5mol/L NaOH and 0.5mol/L Na2SO3In the mixed solution of (1).
2. Placing in an electric heating jacket, and boiling for 8-12h to remove lignin from wood.
3. After the mixed solution in the previous step is treated, deionized water is added and boiled for about 1 hour to wash away residual impurities, and the steps are repeated for three times.
4. And (3) placing the treated wood in a vacuum freeze dryer for freeze drying for 8-12 h.
5. In N2Under protection, the dried wood is placed in a high-temperature tube furnace: heating at a heating rate of 3-5 ℃/min to 300 +/-50 ℃ for 1-2h, heating at the same heating rate to 500 +/-50 ℃ and heating at the same heating rate for 1-2h to obtain the porous carbonized wood matrix.
6. And putting the lauric acid and the porous carbonized wood into a vacuum device, melting the lauric acid at 80 ℃, vacuumizing, and carrying out vacuum melting, impregnation and packaging on the lauric acid to obtain the lauric acid/porous carbonized wood composite phase change energy storage material.
Example 1
Taking phoenix tree as raw material, firstly cutting the phoenix tree into the size of 35mm multiplied by 15mm multiplied by 5mm, placing the cut phoenix tree into a 200ml conical flask, and then adding a proper amount of 2.5mol/L NaOH and 0.5mol/L Na into the conical flask2SO3The solution was mixed. Putting the conical flask into an electric heating sleeve, and building a reflux device. The wood pieces were boiled for 10h and then boiled 3 times with deionized water for 1h each, and the resulting wood was freeze-dried in a vacuum freeze-dryer for 12h to obtain delignified porous wood. In N2Under the protection condition, heating the delignified porous wood to 300 ℃ at the speed of 3.0 ℃/min, preserving heat and heating for 1h, then heating to 500 ℃ at the same speed, preserving heat and heating for 1h to obtain the porous carbonized wood, wherein an SEM picture of the porous carbonized wood is shown in figure 1, and a regular pore channel structure appears. Then preparing the lauric acid/porous carbonized wood composite phase-change material by a vacuum impregnation method. First, porous carbonized wood and solid lauric acid were placed in a closed glass container. Air was evacuated from the container using a vacuum pump, and then the container was heated in a water bath at 80 ℃ so that the molten lauric acid could be adsorbed into the pores of the porous carbonized wood. And finally, performing multiple leakage tests to obtain a final composite phase change material product, wherein an SEM image of the composite phase change material product is shown in figure 2, and lauric acid is almost completely encapsulated in pore passages of the porous carbonized wood, which shows that the porous carbonized wood has excellent encapsulation performance. The DSC chart is shown in figure 3, and the latent heat of phase change of the encapsulated composite phase change material is as high as 177.9J/g.
Example 2
Taking phoenix tree as raw material, firstly cutting the phoenix tree into the size of 35mm multiplied by 15mm multiplied by 5mm, placing the cut phoenix tree into a 200ml conical flask, and then adding a proper amount of 2.5mol/L NaOH and 0.5mol/L Na into the conical flask2SO3The solution was mixed. Putting the conical flask into an electric heating sleeve, and building a reflux device. The wood pieces were boiled for 12h and then boiled 3 times with deionized water for 1h each, and the resulting wood was freeze-dried in a vacuum freeze-dryer for 10h to obtain delignified porous wood. In N2Under the protection condition, heating the delignified porous wood to 330 ℃ at the speed of 5.0 ℃/min, preserving heat and heating for 1.5h, then heating to 530 ℃ at the same speed, preserving heat and heating for 1.5h to obtain porous carbonized woodWood, whose SEM image is shown in fig. 4, presents a regular cell structure. Then preparing the lauric acid/porous carbonized wood composite phase-change material by a vacuum impregnation method. First, porous carbonized wood and solid lauric acid were placed in a closed glass container. Air was evacuated from the container using a vacuum pump, and then the container was heated in a water bath at 80 ℃ so that the molten lauric acid could be adsorbed into the pores of the porous carbonized wood. And finally, performing multiple leakage tests to obtain a final composite phase change material product, wherein an SEM image of the composite phase change material product is shown in FIG. 5, and lauric acid is almost completely encapsulated in pore passages of the porous carbonized wood, which shows that the porous carbonized wood has excellent encapsulation performance. The DSC chart is shown in figure 6, and the latent heat of phase change of the encapsulated composite phase change material is as high as 177.9J/g.
The present invention may be embodied in many different forms and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A preparation method of a lauric acid/porous carbonized wood composite phase change energy storage material comprises the following steps:
1) adding NaOH and Na into raw phoenix tree wood2SO3In the mixed solution of (1);
2) continuously boiling the solution obtained in the step 1) for 8-12h to remove lignin in the phoenix tree logs;
3) performing solid-liquid separation to obtain a solid product, and adding the solid product into deionized water to boil for 1 h;
4) drying the solid product treated in the step 3) for 8-12 h;
5) heating the solid product dried in the step 4) to obtain a porous carbonized wood matrix;
6) packaging lauric acid in the porous carbonized wood substrate obtained in the step 5) to obtain the lauric acid/porous carbonized wood composite phase change energy storage material.
2. The method as claimed in claim 1, wherein the raw phoenix tree wood in step 1) isThe size is 35mm multiplied by 15mm multiplied by 5 mm; the addition amount of the NaOH is 8g, and the concentration is 2.5 mol/L; the Na is2SO3The amount of (2) was 5g, and the concentration was 0.5 mol/L.
3. The method of claim 1, wherein the boiling of the deionized water in step 3) is repeated three times.
4. The method of claim 1, wherein the solid product of step 4) is freeze dried in a vacuum freeze dryer.
5. The method of claim 1, wherein the dried solid product is heated in step 5): heating at 300 + -50 deg.C for 1-2h, and heating at 500 + -50 deg.C for 1-2 h.
6. The method of claim 1, wherein in step 5) N is2And (4) reacting under protection.
7. The method according to claim 1, wherein the porous carbonized wood matrix obtained in the step 6) is used for encapsulating lauric acid by vacuum melting impregnation to obtain the lauric acid/porous carbonized wood composite phase change energy storage material.
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Cited By (5)
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| CN113046030A (en) * | 2021-02-04 | 2021-06-29 | 上海大学 | Preparation method of delignified balsawood/phase-change composite material |
| CN114058335A (en) * | 2020-08-04 | 2022-02-18 | 中国科学院大连化学物理研究所 | Preparation and application of natural environment-friendly shape-stabilized phase change material |
| CN114106782A (en) * | 2021-12-08 | 2022-03-01 | 华中科技大学 | Fast-growing wood matrix composite sensible heat-thermochemical heat storage material and preparation method thereof |
| CN114619531A (en) * | 2022-04-02 | 2022-06-14 | 北京林业大学 | Energy storage wood with layered double hydroxide and polypyrrole as photo-thermal super-hydrophobic surface and preparation method thereof |
| CN115505375A (en) * | 2022-09-23 | 2022-12-23 | 同济大学 | Preparation method of hierarchical magnetic porous carbonized wood composite phase change material |
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| CN114106782A (en) * | 2021-12-08 | 2022-03-01 | 华中科技大学 | Fast-growing wood matrix composite sensible heat-thermochemical heat storage material and preparation method thereof |
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| CN114619531A (en) * | 2022-04-02 | 2022-06-14 | 北京林业大学 | Energy storage wood with layered double hydroxide and polypyrrole as photo-thermal super-hydrophobic surface and preparation method thereof |
| CN115505375A (en) * | 2022-09-23 | 2022-12-23 | 同济大学 | Preparation method of hierarchical magnetic porous carbonized wood composite phase change material |
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