Phase-change energy-saving wallboard and preparation method thereof
By adding composite fillers and surfactants to paraffin wax to form a three-dimensional thermally conductive network, the insufficient thermal conductivity and recycling problems of phase change wall panels are solved, achieving rapid response and resource recycling.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- LESTINE SMART HOME CO LTD
- Filing Date
- 2025-12-25
- Publication Date
- 2026-05-12
AI Technical Summary
Existing phase change wall panels have insufficient thermal conductivity, resulting in slow heat exchange rate, delayed temperature regulation response, and difficulty in recycling, leading to serious waste of resources.
A phase change material is prepared by adding composite fillers, including thermally conductive materials such as boron nitride whiskers and titanium diboride, to paraffin wax, forming a three-dimensional thermally conductive network by coating with polyethylene wax, and using anionic surfactants to improve stability.
It improves the thermal performance and cycle stability of phase change wall panels, enables rapid response to temperature changes, reduces recycling costs, and achieves resource recycling.
Smart Images
Figure SMS_1
Abstract
Description
Technical Field
[0001] This invention relates to the field of building materials technology, specifically to a phase change energy-saving wall panel and its preparation method. Background Technology
[0002] In the field of building energy conservation, phase change materials are widely used in building envelopes such as wall panels because of their ability to absorb or release a large amount of latent heat during the phase change process, so as to achieve passive regulation of indoor temperature and reduce building energy consumption.
[0003] Currently, most commonly used phase change wall panels are based on organic phase change materials such as paraffin wax. However, their low thermal conductivity results in slow heat exchange rates, sluggish temperature response, and difficulty in quickly adapting to changes in indoor and outdoor temperatures. To improve thermal conductivity, related technologies often directly add thermally conductive materials such as aluminum powder and graphite powder to paraffin wax. However, these materials tend to agglomerate and settle in liquid paraffin wax, failing to form a uniform thermal network and affecting long-term stability. Furthermore, the recycling of existing phase change energy-saving wall panels is difficult. When the panels are discarded or renovated, the phase change material is difficult to separate from the substrate efficiently, leading to resource waste and potentially generating large amounts of solid waste. Therefore, there is an urgent need for a phase change energy-saving wall panel with good cycle stability and easy resource recycling. Summary of the Invention
[0004] This invention proposes a phase change energy-saving wall panel and its preparation method, which solves the problems of poor cycle stability and high recycling difficulty of phase change wall panels in related technologies.
[0005] The technical solution of the present invention is as follows: This invention proposes a phase change energy-saving wall panel, comprising an aluminum plate shell and a phase change material filled inside the aluminum plate shell, wherein the phase change material comprises the following components in parts by weight: 70-80 parts of paraffin wax, 12-24 parts of composite filler, and 1-2 parts of stabilizer; The composite filler comprises the following components in parts by weight: 10-20 parts of thermally conductive material and 2-4 parts of polyethylene wax.
[0006] In this invention, the phase change material filling the interior of the aluminum plate shell is a phase change material that fills 80% to 90% of the volume of the cavity inside the aluminum plate shell; In the preparation of the phase change energy-saving wall panel of this invention, the thermal performance of the phase change energy-saving wall panel is improved by adding thermally conductive materials, which accelerates the heat transfer rate between the paraffin phase change material and the external environment, enabling the wall panel to respond quickly to temperature changes and improving the efficiency of phase change energy storage and temperature control.
[0007] As a further technical solution, the preparation method of the composite filler includes the following steps: Polyethylene wax is dissolved in toluene to obtain a mixed solution. The thermally conductive material is dispersed in the mixed solution, stirred, freeze-dried, and pulverized to obtain a composite filler.
[0008] As a further technical solution, the melting temperature is 90~100℃.
[0009] As a further technical solution, the concentration of polyethylene wax in the mixed solution is 10wt%~20wt%.
[0010] As a further technical solution, the particle size of the composite filler is 6~8μm.
[0011] As a further technical solution, the particle size of the composite filler is 6μm.
[0012] As a further technical solution, the mass ratio of the polyethylene wax to the thermally conductive material is 1:5~10.
[0013] As a further technical solution, the thermally conductive material includes one or both of boron nitride whiskers and titanium diboride.
[0014] As a further technical solution, when the thermally conductive material is titanium diboride and boron nitride whiskers, the mass ratio of titanium diboride and boron nitride whiskers is 1:3~5.
[0015] In the preparation of the phase change energy-saving wall panel of this invention, boron nitride whiskers and titanium diboride are used as thermally conductive materials. The boron nitride whiskers intertwine to form a three-dimensional network skeleton, while the titanium diboride fills the gaps in the network, thus constructing a three-dimensional thermally conductive network, thereby improving the cycle stability of the prepared phase change material. Furthermore, by controlling the mass ratio of titanium diboride to boron nitride whiskers to 1:3~5, the cycle stability of the prepared phase change material is further improved.
[0016] As a further technical solution, the stabilizer includes anionic surfactants.
[0017] As a further technical solution, the anionic surfactant includes one or two of sodium dodecylbenzenesulfonate, sodium dodecyl sulfonate, and sodium fatty alcohol polyoxyethylene ether sulfate.
[0018] In the preparation of the phase change energy-saving wall panel of this invention, anionic surfactants such as sodium dodecylbenzenesulfonate, sodium dodecyl sulfonate and sodium fatty alcohol polyoxyethylene ether sulfate are used as stabilizers to reduce the interfacial tension between paraffin and composite filler, so that the two can be better dispersed to each other, enhance the stability of the system, and thus improve the cycle stability of the prepared phase change material.
[0019] This invention also proposes a method for preparing a phase change energy-saving wall panel, comprising the following steps: After melting paraffin wax, composite fillers and stabilizers are added and stirred to obtain a phase change material. The phase change material is then poured into the aluminum plate shell and sealed to obtain the phase change energy-saving wall panel.
[0020] The working principle and beneficial effects of this invention are as follows: 1. In this invention, the cycle stability of the phase change energy-saving wall panel is improved by adding composite fillers to paraffin wax. Specifically, the composite of thermally conductive material and polyethylene wax significantly improves the interfacial compatibility between the thermally conductive material and the paraffin wax matrix, while preventing its agglomeration and sedimentation within the paraffin wax matrix, ensuring its uniform dispersion and thus enhancing the cycle stability of the phase change energy-saving wall panel.
[0021] 2. In this invention, when the wall panel reaches the end of its service life or needs renovation, only low-temperature heating (slightly higher than the phase change temperature of paraffin) is required to rapidly melt the paraffin inside the wall panel and separate it from the aluminum substrate and composite filler, without the need for complex disassembly or high-temperature smelting. This recycling method can preserve the structural integrity and material properties of the aluminum wall panel to the greatest extent, with an aluminum resource recovery rate of over 95%, reducing recycling costs. Simultaneously, the paraffin separated during the recycling process can be reused in the preparation of phase change materials after simple purification, realizing the recycling of component resources and reducing solid waste emissions. Detailed Implementation
[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0023] In the following examples and comparative examples, the average particle size of the aluminum powder was 5 μm; the average particle size of the graphite powder was 5 μm; the average particle size of the titanium diboride was 5 μm; the average diameter of the boron nitride whiskers was 1 μm and the length was 15 μm, and the manufacturer was Beijing Deco Island Gold Technology Co., Ltd.; the paraffin wax was No. 35 paraffin wax; the molecular weight of the sodium fatty alcohol polyoxyethylene ether sulfate was 332.432, and the manufacturer was Guangzhou Chengyi Chemical Co., Ltd.; the polyethylene wax was BN-501, and the manufacturer was Qingdao Bonnie Chemical Co., Ltd.
[0024] Example 1 A phase change material comprising the following components in parts by weight: 70 parts paraffin, 12 parts composite filler, and 1 part sodium dodecylbenzenesulfonate; The composite filler comprises the following components in parts by weight: 10 parts copper powder and 2 parts polyethylene wax; The preparation method of the composite filler includes the following steps: dissolving polyethylene wax in toluene at 90°C to obtain a mixed solution with a polyethylene wax concentration of 10wt%, dispersing copper powder in the mixed solution, stirring, freeze-drying, and pulverizing using a pulverizer at a pulverization rate of 2000rpm for 30min to obtain the composite filler; A method for preparing a phase change energy-saving wall panel includes the following steps: After melting paraffin wax, composite filler and sodium dodecylbenzene sulfonate are added, stirred and poured into an aluminum plate shell, filling 80% of the internal cavity volume of the aluminum plate shell, and then sealed to obtain a phase change energy-saving wall panel.
[0025] Example 2 A phase change material comprising the following components in parts by weight: 80 parts paraffin, 24 parts composite filler, 1 part sodium dodecyl sulfonate, and 1 part sodium fatty alcohol polyoxyethylene ether sulfate. The composite filler comprises the following components in parts by weight: 20 parts copper powder and 2 parts polyethylene wax; The preparation method of the composite filler includes the following steps: dissolving polyethylene wax in toluene at 100℃ to obtain a mixed solution with a polyethylene wax concentration of 20wt%, dispersing copper powder in the mixed solution, stirring, freeze-drying, and pulverizing using a pulverizer at a pulverization rate of 2000rpm for a pulverization time of 30min to obtain the composite filler; A method for preparing a phase change energy-saving wall panel includes the following steps: After melting paraffin wax, add composite filler, sodium dodecyl sulfonate and sodium fatty alcohol polyoxyethylene ether sulfate, stir and pour into the aluminum plate shell, filling 90% of the internal cavity volume of the aluminum plate shell, and seal to obtain phase change energy-saving wall panel.
[0026] Example 3 A phase change material comprising the following components in parts by weight: 75 parts paraffin, 18 parts composite filler, and 1.5 parts sodium dodecylbenzenesulfonate; The composite filler comprises the following components in parts by weight: 15 parts copper powder and 3 parts polyethylene wax; The preparation method of the composite filler includes the following steps: dissolving polyethylene wax in toluene at 90°C to obtain a mixed solution with a polyethylene wax concentration of 20wt%, dispersing copper powder in the mixed solution, stirring, freeze-drying, and pulverizing using a pulverizer at a pulverization rate of 2000rpm for 30min to obtain the composite filler; A method for preparing a phase change energy-saving wall panel includes the following steps: After melting paraffin wax, composite filler and sodium dodecylbenzene sulfonate are added, stirred, and then poured into an aluminum plate shell, filling 80% of the internal cavity volume of the aluminum plate shell. After sealing, a phase change energy-saving wall panel is obtained.
[0027] Example 4 The only difference between this embodiment and Embodiment 3 is that copper powder is replaced with graphite powder.
[0028] Example 5 The only difference between this embodiment and Embodiment 3 is that copper powder is replaced with titanium diboride.
[0029] Example 6 The only difference between this embodiment and Embodiment 3 is that copper powder is replaced with boron nitride whiskers.
[0030] Example 7 The only difference between this embodiment and Embodiment 3 is that 15 parts of copper powder are replaced with 5 parts of titanium diboride and 10 parts of boron nitride whiskers.
[0031] Example 8 The only difference between this embodiment and Embodiment 3 is that 15 parts of copper powder are replaced with 2 parts of titanium diboride and 13 parts of boron nitride whiskers.
[0032] Example 9 The only difference between this embodiment and Embodiment 3 is that 15 parts of copper powder are replaced with 3.75 parts of titanium diboride and 11.25 parts of boron nitride whiskers.
[0033] Example 10 The only difference between this embodiment and Embodiment 3 is that 15 parts of copper powder are replaced with 2.5 parts of titanium diboride and 12.5 parts of boron nitride whiskers.
[0034] Comparative Example 1 The only difference between this comparative example and Example 3 is that the composite filler is replaced with copper powder.
[0035] Cyclic stability tests were conducted on the phase change energy-saving wall panels prepared in Examples 1-10 and Comparative Example 1, respectively: Phase change latent heat: The phase change latent heat of the sample before cycling was determined according to the test method specified in JC / T 2111-2012 "Test Method for Phase Change Temperature Regulation Performance of Building Materials"; The sample was placed in a 60℃ constant temperature drying oven for 20 min, then removed and placed at room temperature for 20 min, which constituted one cycle. This cycle was repeated 100 times. The latent heat of phase change after the cycle was measured, and the rate of change of latent heat of phase change was calculated. The rate of change of latent heat of phase change (%) = [(latent heat of phase change before cycle - latent heat of phase change after cycle) / latent heat of phase change before cycle] × 100%; The results are shown in Table 1 below.
[0036] Table 1 Cyclic stability test results
[0037] By comparing the data of Example 3 and Comparative Example 1, the phase change material prepared in Example 3, which uses copper powder coated with polyethylene wax as a composite filler, has a lower latent heat change rate after 100 cycles than that in Comparative Example 1. This indicates that the cycle stability of the prepared phase change material can be improved by using polyethylene wax to coat the thermally conductive material.
[0038] By comparing the data from Examples 3-10, Examples 9-10, which used polyethylene wax-coated titanium diboride and boron nitride whiskers as composite fillers, showed that the latent heat of phase change of the phase change material after 100 cycles was lower than that of Examples 3-8 when the mass ratio of titanium diboride to boron nitride whiskers was 1:3-5. This indicates that by adding polyethylene wax-coated titanium diboride and boron nitride whiskers, and when the mass ratio of titanium diboride to boron nitride whiskers is 1:3-5, the cycle stability of the prepared phase change material can be further improved.
[0039] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A phase change energy-saving wall panel, characterized in that, It includes an aluminum plate shell and a phase change material filled inside the aluminum plate shell. The phase change material includes the following components in parts by weight: 70-80 parts paraffin wax, 12-24 parts composite filler, and 1-2 parts stabilizer. The composite filler comprises the following components in parts by weight: 10-20 parts of thermally conductive material and 2-4 parts of polyethylene wax.
2. The phase change energy-saving wall panel according to claim 1, characterized in that, The mass ratio of the polyethylene wax to the thermally conductive material is 1:5~10.
3. The phase change energy-saving wall panel according to claim 1, characterized in that, The method for preparing the composite filler includes the following steps: Polyethylene wax is dissolved in toluene to obtain a mixed solution. The thermally conductive material is dispersed in the mixed solution, stirred, freeze-dried, and pulverized to obtain the composite filler.
4. A phase change energy-saving wall panel according to claim 3, characterized in that, The melting temperature is 90~100℃.
5. A phase change energy-saving wall panel according to claim 3, characterized in that, The concentration of polyethylene wax in the mixed solution is 10wt%~20wt%.
6. A phase change energy-saving wall panel according to claim 2, characterized in that, The thermally conductive material includes boron nitride whiskers and / or titanium diboride.
7. A phase change energy-saving wall panel according to claim 6, characterized in that, When the thermally conductive material is titanium diboride and boron nitride whiskers, the mass ratio of titanium diboride and boron nitride whiskers is 1:3~5.
8. A phase change energy-saving wall panel according to claim 1, characterized in that, The stabilizer includes anionic surfactants.
9. A phase change energy-saving wall panel according to claim 8, characterized in that, The anionic surfactant includes one or two of sodium dodecylbenzenesulfonate, sodium dodecyl sulfonate, and sodium fatty alcohol polyoxyethylene ether sulfate.
10. A method for preparing a phase change energy-saving wall panel, used to prepare the phase change energy-saving wall panel according to any one of claims 1 to 9, characterized in that, Includes the following steps: After melting paraffin wax, composite fillers and stabilizers are added and stirred to obtain a phase change material. The phase change material is then poured into the aluminum plate shell and sealed to obtain the phase change energy-saving wall panel.