Novel phase change energy module and preparation method therefor
By combining powdered composite shaped phase change materials with modified support skeleton materials, the problems of supercooling, poor fluidity, and structural degradation of gel-like phase change materials are solved, achieving stability and rapid heat exchange, which is suitable for building energy conservation and battery thermal management.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- DALIAN UNIV OF TECH
- Filing Date
- 2025-06-28
- Publication Date
- 2026-06-25
AI Technical Summary
Gel-like phase change materials are prone to supercooling during phase change, have poor fluidity, are difficult to uniformly fill complex spaces, and are easily degraded during long-term use, resulting in performance degradation and poor cycle performance.
Powdered composite shaped phase change material is used. By modifying the supporting skeleton material to adsorb the phase change substrate and additives, a hydrophilic and oleophilic phase change system is formed. Combined with encapsulation bag packaging, the flowability and stability are improved, and the risk of phase separation and leakage is reduced.
It achieves stability and good cycle performance of powdered phase change materials during long-term use, rapid heat exchange, and has a simple synthesis process and stable application, making it suitable for building energy conservation and battery thermal management.
Smart Images
Figure CN2025105072_25062026_PF_FP_ABST
Abstract
Description
A novel phase transition energy lattice and its preparation method Technical Field
[0001] This invention relates to a novel phase change energy lattice and its preparation method, which belongs to the technical field of phase change energy storage materials. Background Technology
[0002] Phase change energy storage materials (PCEs) are substances that, during heating (or cooling), reach their phase change temperature and absorb (or release) a large amount of heat from the environment, maintaining a constant temperature for a period of time. Based on their phase state, they can be classified into solid-solid, solid-liquid, solid-gas, and liquid-gas PCEs; based on their chemical composition, they can be classified into organic, inorganic, and composite PCEs. Currently, solid-liquid PCEs are the most researched.
[0003] Organic solid-liquid phase change materials (PCMs) have low supercooling and good cycle performance, but are highly flammable. Inorganic PCMs have good flame retardancy and high enthalpy, but are prone to phase separation. Meanwhile, leakage is an unavoidable problem during the phase change process for both organic and inorganic PCMs, a major factor hindering their practical application. One method to prevent leakage is to encapsulate the PCM as a core material and the polymer as a shell material; however, this method is costly and not suitable for large-scale applications. Another method is to use porous materials for encapsulation, such as fumed silica and expanded vermiculite. Using porous materials to shape and encapsulate PCMs can alleviate leakage, but because it relies solely on capillary action, the adsorption rate is low, and the PCM easily seeps out from the pores, resulting in poor long-term stability of the composite material. Furthermore, even after shaping, PCMs still suffer from pressure differentials, poor cycle stability, and leakage during long-term operation. Technical issues
[0004] During the phase transition process, gel-like phase change materials (PCMs) experience relatively difficult molecular chain movement and rearrangement, making them prone to supercooling. This means the material only begins to undergo a phase transition when cooled below its theoretical phase transition temperature. Furthermore, gel-like materials possess viscosity and elasticity, resulting in poor flowability. In applications requiring tight packing or complex shapes, they struggle to uniformly fill spaces, potentially leading to uneven heat transfer. Over long-term use, gel-like PCMs may experience gel structure degradation and aging, leading to performance decline. Additionally, their cycling performance is poor; after multiple phase transition cycles, the gel structure may be damaged, resulting in reduced latent heat of phase transition and decreased thermal conductivity. Technical solutions
[0005] To address the problems existing in the prior art, this invention provides a novel method for preparing phase change energy lattices. The novel phase change energy lattices prepared by this invention possess suitable phase change temperatures and high phase change enthalpies. By modifying the supporting framework and performing primary adsorption, the fluidity of the material after phase change is reduced. Organic-inorganic composites reduce phase separation and improve flame retardancy. Furthermore, macroscopic secondary encapsulation effectively solves the leakage problem during the phase change process. Compared to gel-like phase change materials, the powdered phase change material in this application exhibits relatively stable physical and chemical properties, is less prone to deterioration or performance degradation during long-term use, and the particles of the powdered phase change material remain relatively stable during phase change cycling, maintaining good cycling performance. The powdered material in this energy pack facilitates easier filling during production, results in more stable and long-lasting application, and the material synthesis process is simple, making the product easy to apply and possessing broad application prospects.
[0006] The technical solution of the present invention is as follows:
[0007] The fabrication of a novel phase change energy lattice comprises a composite shape-stabilized phase change system with thermal energy storage properties and an encapsulation bag. The composite shape-stabilized phase change system is obtained by combining a hydrophilic shape-stabilized phase change system and a lipophilic phase change system, wherein the hydrophilic and lipophilic phase change systems include a modified support framework material, a phase change substrate, and additives.
[0008] In the above technical solution, the ratio of hydrophilic and oleophilic phase change systems in the composite shaping phase change system is 2:8 to 8:2, wherein the modified support skeleton material accounts for 30% to 1% of the mass, the phase change substrate accounts for more than or equal to 50% and less than 99% of the mass, and the additives account for more than zero and less than or equal to 20%.
[0009] In the above technical solution, the packaging bag is one of aluminum foil bags, tin foil bags, copper foil bags, PET bags, PE bags, polytetrafluoroethylene bags, and polypropylene bags.
[0010] The modified support framework material includes hydrophilic modified support frameworks and oleophilic modified support frameworks. The hydrophilic / hydrophobic modification methods include, but are not limited to, surface sintering, acid-base reactions, chemical grafting, and gas-phase reactions. The modified support framework material is one or more of the following: hydrophilic or oleophilic modified porous silica, expanded vermiculite, diatomaceous earth, expanded perlite, expanded graphite, activated carbon, porous carbon, bentonite, and porous ceramics.
[0011] In the above technical solution, the phase change substrate is one or more of the following: sodium carbonate decahydrate, sodium sulfate decahydrate, calcium chloride hexahydrate, disodium hydrogen phosphate dodecahydrate, sodium acetate trihydrate, copper sulfate heptahydrate, magnesium sulfate heptahydrate, disodium hydrogen phosphate heptahydrate, barium hydroxide octahydrate, potassium aluminum sulfate dodecahydrate, paraffin wax, tetradecane, hexadecane, octadecane, eicosane, decanoic acid, dodecanoic acid, tetradecanoic acid, pentadecanoic acid, palmitic acid, stearic acid, dodecayl alcohol, tetradecyl alcohol, hexadecyl alcohol, octadecyl alcohol, polyethylene glycol with a molecular weight of 200-20000, xylitol, sorbitol, erythritol tetrapalmitate, galactitol hexapalmitate, galactitol hexastearic acid, tristearate, tripalmitate, trimyristic acid, butyl stearate, soybean oil, corn oil, peanut oil, rapeseed oil, olive oil, and castor oil.
[0012] In the above technical solution, the auxiliary agent is one or more of the following: water, carboxymethyl cellulose, sodium carboxymethyl cellulose, sodium alginate, xanthan gum, carrageenan, polyacrylic acid, sodium polyacrylate, sodium metasilicate nonahydrate, dimethyl fumarate, diethyl fumarate and dibutyl fumarate, fumaric acid, benzoic acid, sodium benzoate, p-chlorom-xylenol, salicylaniline and tetrachlorophenol, pentachlorophenol, sorbic acid and its salts, chloroacetic acid, halophenoxyacetic acid, alkyl thiocyanate, halosalicylic acid, thiosalicylic acid, sodium chlorite, iodide, boric acid and its salts, sulfites and metabisulfites, and sodium nitrite.
[0013] This invention also provides a method for preparing the above-mentioned novel energy lattice, comprising the following steps:
[0014] (1) The hydrophilic and oleophilic phase change substrates are heated and melted at 50-80°C and magnetically stirred for 0.5-2 hours to form a uniform liquid.
[0015] (2) Add the additives and modified support skeleton materials to the phase change substrate in the molten state in step (1). The hydrophilic modified skeleton material adsorbs the hydrophilic phase change substrate, and the oleophilic modified skeleton material adsorbs the oleophilic phase change substrate. Stir continuously during the process to ensure uniform mixing.
[0016] (3) The composite material in step (2) is placed in a vacuum drying oven at 50℃~80℃ and heated to obtain a hydrophilic shape-stabilized phase change system and an oleophilic phase change system.
[0017] (4) The prepared hydrophilic shape-fixed phase change system and lipophilic phase change system are repeatedly mixed evenly, put into a packaging bag, and sealed with a hot press to obtain a new type of phase change energy lattice. Beneficial effects
[0018] This invention provides a novel method for preparing a phase change energy lattice, which comprises a composite shaped phase change system with thermal energy storage properties and an encapsulation bag. The powdered composite shaped phase change material in this application is a complete technical solution obtained through the synergistic interaction of a modified support framework, a phase change substrate, and additives. The modified support framework material, with its abundant specific surface area, porous structure, and hydrophilic / hydrophobic properties, adsorbs the phase change substrate and additives, resulting in a morphologically stable shaped phase change material. The organic-inorganic phase change system is composited to reduce phase separation while improving flame retardant properties. The addition of additives reduces phase separation, water loss, and flowability issues of the phase change substrate. Simultaneously, the encapsulation bag achieves secondary encapsulation of the composite phase change system, resulting in the novel phase change energy lattice. The powdered composite shaped phase change material encapsulated in the encapsulation bag has a large specific surface area, allowing for faster heat exchange with the surrounding environment during temperature changes, with relatively low supercooling. Furthermore, the powdered phase change material has good flowability, enabling better filling into the encapsulation bag. This energy grid is not only simple to synthesize, but also pressure-resistant, wear-resistant, leak-proof, and easy to use, thus it has broad application prospects in building energy conservation, battery thermal management and other fields. Attached Figure Description
[0019] Figure 1 shows the energy grid product in Example 1.
[0020] Figure 2 shows the DSC curve of the composite shape-stabilized phase transition system in Example 1.
[0021] Figure 3 shows the DSC curve of the composite shape-stabilized phase transition system in Example 2.
[0022] Figure 4 shows the DSC curves of the composite shape-stabilized phase transition system in Comparative Example 2 before and after 50 cycles. The best embodiment of the present invention
[0023] The following non-limiting embodiments are intended to enable those skilled in the art to more fully understand the present invention, but do not limit the invention in any way. Unless otherwise specified, the test methods described in the following embodiments are conventional methods; the reagents and materials described are commercially available unless otherwise specified.
[0024] A novel phase change energy lattice is described, which uses a powdered composite shaped phase change material with thermal energy storage properties encapsulated in an encapsulation bag.
[0025] The composite shape-stabilized phase change material is obtained by combining a hydrophilic shape-stabilized phase change system and an oleophilic phase change system. The hydrophilic shape-stabilized phase change system and the oleophilic phase change system respectively include a modified support skeleton material, a phase change substrate, and an additive. The hydrophilic shape-stabilized phase change system includes a hydrophilic modified support skeleton material, a phase change substrate, and an additive. The oleophilic phase change system includes an oleophilic modified support skeleton material, a phase change substrate, and an additive.
[0026] In the composite shape-stabilized phase change system, the ratio of hydrophilic shape-stabilized phase change material to oleophilic phase change system is 2:8 to 8:2. The selection principle for the hydrophilic to oleophilic ratio is adjusted according to the application scenario's requirements for phase change temperature, flame retardancy, and other properties, such as 2:8, 3:7, 4:6, 5:5, 7:3, and 8:2. The modified support skeleton material accounts for 30% to 1% of the mass, such as 1%, 2%, 5%, 8%, 15%, 20%, and 30%. The phase change substrate accounts for greater than or equal to 50% and less than 99% of the mass, such as 50%, 70%, 80%, 90%, and 95%. The additives account for greater than zero and less than or equal to 20%, such as 2%, 5%, 8%, and 10%.
[0027] Encapsulation bags are macroscopic packaging materials for encapsulating powdered composite shaped phase change materials. They require excellent sealing properties to prevent leakage and block external substances; suitable mechanical properties to prevent easy tearing or puncture during daily handling, installation, and use; good thermal conductivity to quickly absorb and release heat while withstanding corresponding high temperatures without losing their sealing and mechanical properties; chemical compatibility to prevent chemical reactions with the phase change material; and good processing performance for easy molding and sealing, ensuring consistent and stable quality during the sealing process, and allowing for mass production. Encapsulation bags, based on the above performance requirements, can be selected from one of the following: aluminum foil bags, tin foil bags, copper foil bags, PET bags, PE bags, polytetrafluoroethylene bags, and polypropylene bags.
[0028] Modified support framework materials are used to improve compatibility with phase change materials, increase thermal conductivity, and enhance material stability and cycle performance. This involves modifying the original framework material to be hydrophilic or oleophilic. Modified support framework materials include hydrophilic and oleophilic modified support frameworks. Hydrophilic modified support frameworks are used in hydrophilic shaped phase change materials, while oleophilic modified support frameworks are used in oleophilic phase change systems. Modification methods include surface sintering, acid-base reactions, chemical grafting, and gas-phase reactions. Modified support framework materials are one or more of the following: porous silica, expanded vermiculite, diatomaceous earth, expanded perlite, expanded graphite, activated carbon, porous carbon, bentonite, and porous ceramics, modified with either hydrophilic or oleophilic methods.
[0029] Phase change substrate is the core of powdered composite shaped phase change materials, playing a key role in energy storage. It also determines the phase change temperature and latent heat characteristics, affecting the stability and cycle life of the material. In addition, it plays a synergistic role with other components. Phase change substrate is usually combined with other additives (such as support skeleton, stabilizers, thermal conductivity enhancers, etc.). The properties of phase change substrate will affect the way it interacts with these additives. The phase change substrate is either a hydrophilic or an oleophilic phase change substrate. The hydrophilic phase change substrate is one or more of the following: sodium carbonate decahydrate, sodium sulfate decahydrate, calcium chloride hexahydrate, disodium hydrogen phosphate dodecahydrate, sodium acetate trihydrate, copper sulfate heptahydrate, magnesium sulfate heptahydrate, disodium hydrogen phosphate heptahydrate, barium hydroxide octahydrate, and potassium aluminum sulfate dodecahydrate. The oleophilic phase change substrate is one or more of the following: paraffin wax, tetradecane, hexadecane, octadecane, eicosane, decanoic acid, dodecanoic acid, tetradecanoic acid, pentadecanoic acid, palmitic acid, stearic acid, dodecayl alcohol, tetradecyl alcohol, hexadecyl alcohol, octadecyl alcohol, polyethylene glycol with a molecular weight of 200-20000, xylitol, sorbitol, erythritol tetrapalmitate, galactitol hexapalmitate, galactitol hexastearic acid, tristearate, tripalmitate, trimyristic acid, butyl stearate, soybean oil, corn oil, peanut oil, rapeseed oil, olive oil, and castor oil.
[0030] To generate powdered composite shaped phase change materials (PCMs) and simultaneously improve their performance, appropriate additives are needed in addition to the PCM substrate and modified support framework. These additives may play the following roles: In improving the cycling performance of PCMs, they can promote crystallization, reduce supercooling and phase separation, and prevent the decline in PCM performance due to water loss from crystallization; they can also increase thermal conductivity or regulate the phase change temperature and latent heat. In enhancing physical properties, they can improve stability: volume changes may occur during the phase change process, and additives can stabilize the structure; they can also improve flowability and filling properties. In improving chemical properties, they can enhance chemical stability and improve material compatibility. The additives used are one or more of the following: water, carboxymethyl cellulose, sodium carboxymethyl cellulose, sodium alginate, xanthan gum, carrageenan, polyacrylic acid, sodium polyacrylate, sodium metasilicate nonahydrate, dimethyl fumarate, diethyl fumarate, dibutyl fumarate, fumaric acid, benzoic acid, sodium benzoate, p-chlorom-xylenol, salicylaniline and tetrachlorophenol, pentachlorophenol, sorbic acid and its salts, chloroacetic acid, halophenoxyacetic acid, alkyl thiocyanate, halosalicylic acid, thiosalicylic acid, sodium chlorite, iodides, boric acid and its salts, sulfites and metabisulfites, and sodium nitrite.
[0031] A method for preparing a novel phase transition energy lattice includes the following steps:
[0032] (1) The hydrophilic phase change substrate and the oleophilic phase change substrate are heated and melted at 50-80°C and magnetically stirred for 0.5-2 hours to form a uniform liquid.
[0033] (2) Add the additives and hydrophilic modified support skeleton material to the hydrophilic phase change substrate in the molten state in step (1), and the hydrophilic modified skeleton material adsorbs the hydrophilic phase change substrate; add the additives and oleophilic modified support skeleton material to the oleophilic phase change substrate in the molten state in step (1), and the oleophilic modified skeleton material adsorbs the oleophilic phase change substrate; stir continuously during the process to ensure uniform mixing.
[0034] (3) The materials in step (2) are placed in a vacuum drying oven at 50℃~80℃ and heated to obtain a hydrophilic shape-stabilized phase change system and an oleophilic phase change system.
[0035] (4) The prepared hydrophilic shape-fixed phase change system and lipophilic phase change system are mixed evenly in proportion, packed into a sealing bag, and sealed with a hot press to obtain a novel phase change energy lattice. Example 1
[0036] Sodium carbonate decahydrate and disodium hydrogen phosphate dodecahydrate were weighed at a mass ratio of 5:5 and placed in a 20mL glass bottle. The mixture was heated and stirred at 50℃ for 1 hour to ensure homogeneity. Then, 2% sodium metasilicate nonahydrate, 5% water, 1% carboxymethyl cellulose, and 2% sodium benzoate were added. The above phase change substrate and additives were then composited with polyvinyl alcohol-modified diatomaceous earth via vacuum impregnation. The composite was then heated in a vacuum drying oven at 60℃ to obtain a powdered hydrophilic shape-stabilized phase change system. The mass ratio of the phase change substrate to polyvinyl alcohol-modified diatomaceous earth was 80:10.
[0037] 25°C phase change paraffin was melted at 50°C, and 2% sodium benzoate was added. After thorough mixing, it was composited with PDMS-modified porous carbon via vacuum impregnation. The PDMS-modified porous carbon was obtained by depositing a mixture of PDMS and porous carbon at a mass ratio of 1:3 in a vapor deposition apparatus at 250°C for 1 hour. After composite formation, the mixture was heated in a vacuum drying oven at 60°C to obtain a powdered, oleophilic, shape-stabilized phase change system. The mass ratio of paraffin to modified porous carbon was 90:8.
[0038] The prepared hydrophilic shape-fixed phase change system and lipophilic shape-fixed phase change system were mixed in a ratio of 2:8 to obtain a powdered composite shape-fixed phase change material, which was then packaged in an aluminum foil bag to obtain an energy lattice with phase change characteristics.
[0039] Figure 1 shows the novel phase change energy lattice product prepared. It is completely sealed with a hot press, which effectively solves the leakage problem of phase change materials. It is also convenient to use and can be directly applied to scenarios that require thermal management. Figure 2 shows the DSC curve of the composite shaped phase change system in the phase change energy lattice of Example 1. Its phase change temperature is 23.6℃ and its phase change enthalpy is 158.5 J / g, which has a suitable phase change temperature and a high phase change enthalpy. Example 2
[0040] Sodium sulfate decahydrate and disodium hydrogen phosphate dodecahydrate were weighed at a mass ratio of 6:4, heated and stirred at 50°C for 1 hour to ensure uniform mixing. Then, 2% sodium metasilicate nonahydrate, 5% deionized water, 1% sodium alginate, and 2% potassium sorbate were added, and the mixture was heated and stirred at 50°C for another 0.5 hours to ensure uniform mixing. The above phase change substrate was then composited with polyvinyl alcohol-modified diatomaceous earth, and the composite was placed in a vacuum drying oven at 60°C for heating to obtain a hydrophilic, shape-stabilized phase change system. The mass ratio of the phase change substrate to polyvinyl alcohol-modified diatomaceous earth was 80:10.
[0041] Octadecylane and eicosane were weighed at a mass ratio of 7:3 and melted at 50°C. 2% sodium benzoate was added, and the mixture was thoroughly mixed. The resulting composite was then vacuum impregnated with PDMS-modified porous carbon via vapor deposition. The PDMS-modified porous carbon was obtained by depositing a mixture of PDMS and porous carbon at a mass ratio of 1:3 in a vapor deposition apparatus at 250°C for 1 hour. After lamination, the composite was heated in a vacuum drying oven at 60°C to obtain an oleophilic, shape-stabilized phase change system in which the mass ratio of paraffin to modified porous carbon was 90:8.
[0042] The prepared hydrophilic shape-fixed phase transition system and lipophilic shape-fixed phase transition system were mixed in a ratio of 3:7 and packaged into an aluminum foil bag to obtain an energy lattice with phase transition characteristics.
[0043] Figure 3 shows the DSC curve of the phase transition energy lattice in Example 2, with a phase transition temperature of 24°C and a phase transition enthalpy of 157 J / g, exhibiting a suitable phase transition temperature and a high phase transition enthalpy.
[0044] Comparative example:
[0045] Sodium sulfate decahydrate and disodium hydrogen phosphate dodecahydrate were weighed at a mass ratio of 6:4, heated and stirred at 50°C for 1 hour to ensure uniform mixing, and then the above phase change substrate was composited with polyvinyl alcohol modified diatomaceous earth. The mass ratio of the phase change substrate to polyvinyl alcohol modified diatomaceous earth was 80:10.
[0046] The oleophilic, shape-stabilizing phase change system and its formulation were consistent with those of Example 2. The resulting energy pack exhibited fluidity of internal materials above the phase change temperature. After 50 thermal cycles, its enthalpy decreased significantly (from 157.8 J / g to 109.4 J / g, Figure 4), and it also showed signs of swelling. Its cycle stability, durability, and practicality were significantly lower than those of Example 2. In contrast, the energy pack of Example 2 remained unchanged after 100 cycles, and its enthalpy did not decrease significantly. This is because the addition of additives reduced phase separation, water loss, and fluidity issues. Embodiments of the present invention
[0047] Examples 3-8
[0048] The packaging bags were replaced with tin foil bags, copper foil bags, PET bags, PE bags, polytetrafluoroethylene bags, and polypropylene bags, respectively, while other conditions remained the same as in Example 1, to obtain the corresponding energy cells. Examples 9-13
[0049] The ratio of the hydrophilic shape-fixed phase transition system to the shape-fixed phase transition system in Example 1 was changed to 4:6, 5:5, 6:4, 7:3, and 8:2, respectively, while other conditions remained the same as in Example 1, to obtain the corresponding energy lattices. Examples 14-21
[0050] The supporting material of the hydrophilic shape-stabilized phase change system in Example 1 was replaced with polyvinyl alcohol-modified porous silica, expanded vermiculite, expanded perlite, expanded graphite, activated carbon, porous carbon, bentonite, and porous ceramics, respectively, while other conditions remained the same as in Example 1, to obtain the corresponding energy lattice. Examples 22-29
[0051] The supporting materials of the oleophilic shape-stabilized phase change system in Example 1 were replaced with PDMS vapor deposition modified porous silica, expanded vermiculite, expanded perlite, expanded graphite, activated carbon, diatomaceous earth, bentonite, and porous ceramics, respectively, while other conditions remained the same as in Example 1, to obtain the corresponding energy lattice. Examples 30-34
[0052] The sodium alginate additive in the hydrophilic shape-stabilizing phase change system of Example 2 was replaced with carboxymethyl cellulose, xanthan gum, carrageenan, polyacrylic acid, and sodium polyacrylate, respectively, while other conditions were the same as in Example 2, to obtain the corresponding energy lattice. Examples 35-55
[0053] The potassium sorbate additive in Example 2 was replaced with dimethyl fumarate, diethyl fumarate, dibutyl fumarate, fumaric acid, benzoic acid, sodium benzoate, p-chlorom-xylenol, salicylaniline, tetrachlorophenol, pentachlorophenol, sorbic acid, chloroacetic acid, halophenoxyacetic acid, alkyl thiocyanate, halosalicylic acid, thiosalicylic acid, sodium chlorite, potassium iodide, boric acid, potassium metabisulfite, and sodium nitrite, respectively. Other conditions were the same as in Example 2, and the corresponding energy grids were obtained. Examples 56-75
[0054] The phase change substrate in the hydrophilic shape-stabilized phase change system of Example 1 was replaced with sodium carbonate decahydrate / sodium sulfate decahydrate 4:6, calcium chloride hexahydrate / disodium hydrogen phosphate dodecahydrate 6:4, sodium acetate trihydrate, copper sulfate heptahydrate / magnesium sulfate heptahydrate 5:5, lauric acid / palmitic acid 3:7, stearic acid, polyethylene glycol 6000, polyethylene glycol 10000, polyethylene glycol 20000, tetradecanoic acid / stearic acid 5:5, xylitol, sorbitol, barium hydroxide octahydrate, potassium aluminum sulfate dodecahydrate, dodecayl alcohol, tetradecyl alcohol, hexadecyl alcohol, octadecyl alcohol, hexadecyl alcohol / stearic acid 3:7, hexadecyl alcohol / stearic acid / palmitic acid 3:3:4, and the additives were 2% sodium metasilicate nonhydrate, 1% carboxymethyl cellulose and 2% potassium sorbate. Other conditions were the same as in Example 1, and the corresponding energy grid was obtained. Examples 76-92
[0055] The phase change substrate in the oleophilic shape-stabilizing phase change system of Example 1 was replaced with tetradecane, hexadecane, octadecane, eicosane, erythritol tetrapalmitate, galactitol hexapalmitate, galactitol hexastearate, tristearate, tripalmitate, trimyristate, butyl stearate, soybean oil, corn oil, peanut oil, rapeseed oil, olive oil, and castor oil, while other conditions remained the same as in Example 1, to obtain the corresponding energy lattice. Examples 93-96
[0056] The phase change substrate in the lipophilic shape-stabilizing phase change system of Example 1 was replaced with tristearate / tripalmitate 2:8, tristearate / trimyristic acid 4:6, soybean oil / corn oil / rapeseed oil 2:3:5, and octadecane / eicosane 5:5, respectively, while other conditions were the same as in Example 1, and the corresponding energy lattices were obtained.
[0057] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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. Industrial applicability
[0058] This invention provides a novel method for preparing a phase change energy lattice, which comprises a composite shaped phase change system with thermal energy storage properties and an encapsulation bag. The powdered composite shaped phase change material in this application is a complete technical solution obtained through the synergistic interaction of a modified support framework, a phase change substrate, and additives. The modified support framework material, with its abundant specific surface area, porous structure, and hydrophilic / hydrophobic properties, adsorbs the phase change substrate and additives, resulting in a morphologically stable shaped phase change material. The organic-inorganic phase change system is composited to reduce phase separation while improving flame retardant properties. The addition of additives reduces phase separation, water loss, and flowability issues of the phase change substrate. Simultaneously, the encapsulation bag achieves secondary encapsulation of the composite phase change system, resulting in the novel phase change energy lattice. The powdered composite shaped phase change material encapsulated in the encapsulation bag has a large specific surface area, allowing for faster heat exchange with the surrounding environment during temperature changes, with relatively low supercooling. Furthermore, the powdered phase change material has good flowability, enabling better filling into the encapsulation bag. This energy grid is not only simple to synthesize, but also pressure-resistant, wear-resistant, leak-proof, and easy to use, thus it has broad application prospects in building energy conservation, battery thermal management and other fields. Sequence List Free Content
[0059] none
Claims
1. A novel phase transition energy lattice, characterized in that, The phase change energy grid uses a powdered composite shaped phase change material with thermal energy storage properties encapsulated in an encapsulated bag; The composite shape-stabilized phase change material is obtained by combining a hydrophilic shape-stabilized phase change system and a lipophilic phase change system. The hydrophilic shape-stabilized phase change system and the lipophilic phase change system respectively include a modified support skeleton material, a phase change substrate, and an additive. In the composite shape-stabilized phase change system, the ratio of hydrophilic shape-stabilized phase change material to oleophilic phase change system is 2:8 to 8:2, wherein the modified support skeleton material accounts for 30% to 1% of the mass, the phase change substrate accounts for more than or equal to 50% and less than 99% of the mass, and the additives account for more than zero and less than or equal to 20%.
2. The novel phase transition energy lattice according to claim 1, characterized in that, The packaging bag is one of the following: aluminum foil bag, tin foil bag, copper foil bag, PET bag, PE bag, polytetrafluoroethylene bag, or polypropylene bag.
3. The novel phase transition energy lattice according to claim 1, characterized in that, The modified support skeleton material includes a hydrophilic modified support skeleton and an oleophilic modified support skeleton. The hydrophilic shape-stabilized phase change material uses a hydrophilic modified support skeleton, and the oleophilic phase change system uses an oleophilic modified support skeleton. The modification methods include surface sintering, acid-base reaction, chemical grafting, and gas phase reaction.
4. The novel phase transition energy lattice according to claim 3, characterized in that: The modified support skeleton material is one or more of the following: porous silica, expanded vermiculite, diatomaceous earth, expanded perlite, expanded graphite, activated carbon, porous carbon, bentonite, and porous ceramics, modified by hydrophilic or oleophilic methods.
5. The novel phase transition energy lattice according to claim 1, characterized in that: The phase change substrate is a hydrophilic phase change substrate and an oleophilic phase change substrate. The hydrophilic phase change substrate is one or more of sodium carbonate decahydrate, sodium sulfate decahydrate, calcium chloride hexahydrate, disodium hydrogen phosphate dodecahydrate, sodium acetate trihydrate, copper sulfate heptahydrate, magnesium sulfate heptahydrate, disodium hydrogen phosphate heptahydrate, barium hydroxide octahydrate, and potassium aluminum sulfate dodecahydrate. The oleophilic phase change substrate is one or more of paraffin wax, tetradecane, hexadecane, octadecane, eicosane, decanoic acid, dodecanoic acid, tetradecanoic acid, pentadecanoic acid, palmitic acid, stearic acid, dodecayl alcohol, tetradecyl alcohol, hexadecyl alcohol, octadecyl alcohol, polyethylene glycol with a molecular weight of 200-20000, xylitol, sorbitol, erythritol tetrapalmitate, galactitol hexapalmitate, galactitol hexastearic acid, tristearate, tripalmitate, trimyristic acid, butyl stearate, soybean oil, corn oil, peanut oil, rapeseed oil, olive oil, and castor oil.
6. The novel phase transition energy lattice according to claim 1, characterized in that: The additives are one or more of the following: water, carboxymethyl cellulose, sodium carboxymethyl cellulose, sodium alginate, xanthan gum, carrageenan, polyacrylic acid, sodium polyacrylate, sodium metasilicate nonahydrate, dimethyl fumarate, diethyl fumarate, dibutyl fumarate, fumaric acid, benzoic acid, sodium benzoate, p-chlorom-xylenol, salicylaniline and tetrachlorophenol, pentachlorophenol, sorbic acid and its salts, chloroacetic acid, halophenoxyacetic acid, alkyl thiocyanate, halosalicylic acid, thiosalicylic acid, sodium chlorite, iodides, boric acid and its salts, sulfites and metabisulfites, and sodium nitrite.
7. The method for preparing the novel phase transition energy lattice according to any one of claims 1 to 6, characterized in that: Includes the following steps: (1) The hydrophilic phase change substrate and the oleophilic phase change substrate are heated and melted at 50-80°C and magnetically stirred for 0.5-2 hours to form a uniform liquid; (2) Add the additives and hydrophilic modified support skeleton material to the hydrophilic phase change substrate in the molten state in step (1), and the hydrophilic modified skeleton material adsorbs the hydrophilic phase change substrate; add the additives and oleophilic modified support skeleton material to the oleophilic phase change substrate in the molten state in step (1), and the oleophilic modified skeleton material adsorbs the oleophilic phase change substrate; stir continuously during the process to ensure uniform mixing; (3) The composite material in step (2) is placed in a vacuum drying oven at 50℃~80℃ and heated to obtain a hydrophilic shape-stabilized phase change system and a lipophilic phase change system; (4) The prepared hydrophilic shape-fixed phase change system and lipophilic phase change system are mixed evenly in proportion, packed into a sealing bag, and sealed with a hot press to obtain a novel phase change energy lattice.