Phase-change energy storage composite material, preparation method thereof, and bag product

Abstract

A phase-change energy storage composite material, a preparation method therefor, and a bag product. The phase-change energy storage composite material comprises the following raw material components in percentage by weight: 25-81% of a phase-change material, 2.5-45% of a resin base material, 0-4.5% of chopped fibers, 0.5-5% of a gel raw material and 10-49% of water. A preparation method comprises granulating the resin base material and the phase-change material which are compatible, and further mixing same with the gel raw material and the like, so as to obtain the gelated phase-change energy storage composite material having high phase-change latent heat. Using the phase-change energy storage composite material for producing bag products, such as hot-water bags, heating cushions and cooling cushions, can keep the temperatures of the hot-water bags and the heating cushions at 40-65℃ for 3-5 h, or keep the temperature of the cooling cushions and the like at 20-32℃ for 3-5 h, thus exerting the good heat preservation / cold insulation properties of the composite material, and remarkably relieving the problems that existing phase-change materials are prone to leakage and have poor flame retardance and the like in use.

Description

Phase change energy storage composite material, preparation method thereof, and bag product Technical Field

[0001] The present invention belongs to the technical field of organic phase change materials, and in particular relates to a phase change energy storage composite material, a preparation method thereof, and a bag product. Background Art

[0002] Phase change energy storage materials are materials that can absorb or release large amounts of latent heat while maintaining their own temperature during a phase change from one physical state to another. In today's society, where energy and environmental issues are prominent, phase change energy storage materials can alleviate the temporal and spatial contradictions between energy supply and demand. The development of high-performance phase change energy storage materials has important theoretical and application value for improving my country's ecological energy-saving industry, military and civilian industries, etc. Phase change energy storage materials can be divided into inorganic phase change materials and organic phase change materials. Compared with inorganic phase change materials, organic phase change materials have advantages such as large phase change latent heat, good thermal stability, non-toxicity and odorlessness, small volume change, little or no supercooling, no phase separation, and readily available raw materials, and have broad application prospects. Organic phase change materials include long-chain alkanes, fatty alcohols, fatty acids, etc.

[0003] However, organic phase change materials are prone to leakage during solid-liquid phase transition. Therefore, while ensuring the basic performance of organic phase change materials, solving the leakage problem of organic phase change materials is of great significance for their practical application. Patent CN101822962B discloses a method for preparing a phase change energy storage capsule with a non-isocyanate polyurethane capsule wall, comprising: (1) taking an organic phase change material and preparing shaped phase change material particles with alginate, polyethylene, etc. as a base material; (2) soaking the prepared shaped phase change material particles in an organic polyamine monomer or oligomer, and then taking them out and air-drying; (3) adding 10 parts of the obtained surface-treated shaped phase change material particles to 12-25 parts of a cyclic carbonate monomer solution diluted with ethyl acetate under stirring conditions, and reacting at 30-70°C to form a non-isocyanate polyurethane layer on the surface of the shaped phase change material particles. The product is filtered, washed, and air-dried to obtain a phase change energy storage capsule. However, the preparation process of this patent is cumbersome and complicated, and the raw material and process costs are high, which is not conducive to popularization and application.

[0004] Patent CN101117572B discloses a composite phase-change thermal storage material using a gel as a carrier and its preparation method. This material consists of a phase-change thermal storage material (60-80% by mass) and a swellable polymer gel carrier (20-40% by mass). This material effectively prevents liquid leakage from the phase-change thermal storage material. This composite phase-change thermal storage material is primarily prepared through two processes: 1) the gel carrier is first prepared by free radical polymerization using reactive monomers, a crosslinker, and an initiator. The gel is then combined with the phase-change thermal storage material through mechanical mixing or solution adsorption; 2) the composite phase-change thermal storage material is directly prepared by in-situ polymerization using the monomers, crosslinker, and initiator used to prepare the gel carrier in a solution containing the phase-change thermal storage material. However, the composite phase-change thermal storage material provided by this patent suffers from poor mechanical properties and formability, resulting in a limited service life.

[0005] Therefore, how to obtain a phase change energy storage material with good heat storage effect, simple preparation and packaging process, and good comprehensive properties such as fluidity, shape stability, and mechanical properties has become a technical problem that needs to be solved urgently in this field. Summary of the Invention

[0006] In response to the defects in the above-mentioned prior art, the purpose of the present invention is to provide a phase change energy storage composite material, a preparation method thereof, and a bag product, which can not only give full play to the comprehensive performance of the phase change energy storage composite material such as good thermal insulation / cold insulation, but also significantly improve the problems of easy leakage and poor flame retardancy of existing phase change materials during use.

[0007] In a first aspect, the present invention provides a phase change energy storage composite material comprising the following raw material components, measured in weight percentage:

[0008] Phase change material 25-81%

[0009] Resin base material 2.5-45%

[0010] Chopped fiber 0-4.5%

[0011] Gel raw material 0.5-5%

[0012] Water 10-49%.

[0013] Preferably, the phase change material comprises an organic phase change material, selected from at least one of paraffin, fatty acid, fatty alcohol, and ester.

[0014] Preferably, the resin substrate is selected from at least one of polyethylene terephthalate resin (PET), styrene-ethylene-butylene-styrene three-segment block copolymer (SEBS), polypropylene (PP), polyethylene (PE), and polycarbonate (PC).

[0015] Preferably, the gel raw material comprises at least one of sodium alginate, sodium carboxymethyl cellulose (CMC-Na), gelatin, chitosan (CTS), polysaccharide, and hyaluronic acid, and the weight percentage of the gel raw material is preferably 1-4%; the phase change energy storage composite material further comprises a cross-linking agent with a weight percentage of 0.04-3.5%.

[0016] Preferably, the cross-linking agent comprises a metal salt cross-linking agent, and the metal salt cross-linking agent comprises at least one of aluminum ions, calcium ions, iron ions, and zinc ions.

[0017] Preferably, the chopped fibers have a weight percentage of 0.5-3% and are selected from at least one of glass fiber, carbon fiber, and quartz fiber.

[0018] Preferably, the phase change energy storage composite material further comprises 0.1-1% by weight of an anti-mold and anti-bacterial agent. The anti-mold and anti-bacterial agent used in the present invention is a commercially available anti-mold and anti-bacterial agent commonly used in the fields of medical treatment, food hygiene, etc. The purpose of use is to maintain the anti-mold and anti-bacterial properties of the phase change energy storage composite material and extend its safe use period.

[0019] In a second aspect, the present invention further provides a method for preparing the composite material comprising the organic phase change material, comprising the following steps:

[0020] (1) Mix the phase change material, resin matrix and optional chopped fibers, heat and stir at 80-180°C for 2-10 minutes, and granulate to obtain a phase change masterbatch;

[0021] (2) The phase change masterbatch obtained in step (1), the gel raw material, water and the optional mildew and antibacterial agent are stirred and mixed uniformly;

[0022] (3) Add an optional cross-linking agent, stir evenly, and let it stand until it is fully gelled to obtain the phase change energy storage composite material.

[0023] By mixing and dispersing a phase change material, preferably an organic phase change material, with a resin matrix and chopped fibers and granulating them, a uniform and stable phase change masterbatch with good mechanical properties is obtained, thereby improving the overall stability and durability of the product.

[0024] On the third aspect, in order to preferentially and exemplarily demonstrate the application prospects of the aforementioned phase change energy storage composite material of the present invention, the present invention further provides a bag product encapsulated with the phase change energy storage composite material, and the bag product is one of a hot water bottle, a heating cushion, a cooling cushion, a cooling pillow, a cooling mat, and a pet ice pad.

[0025] Preferably, after heating, the phase change energy storage composite material maintains the temperature of the hot water bag or heating cushion at 40-65°C for 3-5 hours; or maintains the temperature of the cooling cushion, cooling pillow, cooling mat, or pet ice pad at 20-32°C for 3-5 hours.

[0026] The advantages of the present invention include at least:

[0027] 1) The phase-change energy storage composite material of the present invention, particularly a composite material containing an organic phase-change material, a resin matrix, and a gel raw material in a rational ratio, exhibits good overall uniformity, is simple to use, and is safe and stable. In terms of material composition, the advantages of organic phase-change materials, such as high latent heat of phase change, good thermal stability, non-toxicity and odorlessness, minimal volume change, little or no supercooling, no phase separation, and readily available raw materials, are utilized. These materials are uniformly mixed with a highly compatible resin matrix and, in particular, short-cut fiber reinforcement is added to effectively improve the composite material's energy storage uniformity, stability, and durability. Structurally, the phase-change masterbatch is stably dispersed in a cross-linked gel, resulting in a safe and stable structure. This eliminates the need for complex coating and other protective processes required by existing technologies for the phase-change material, thereby improving production efficiency and reducing costs.

[0028] 2) Combining phase change masterbatch with organic phase change material with gel material can effectively improve the fluidity and comfort of composite materials. The moisture contained in the composite material is conducive to improving the overall thermal conductivity and flame retardant function of the composite material.

[0029] 3) The phase-change energy storage composite material of the present invention comprises raw materials such as a resin matrix, has thermoplasticity, and is convenient for thermal processing such as extrusion. Moreover, the components of the raw materials are easy to mix / compound, the preparation process is simple, and the cost is relatively low. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG1 is a comparison diagram of heat release tests of sample 1 of the present invention, comparative sample D1, and comparative sample D2. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below.

[0032] The phase-change energy storage composite material of the present invention comprises the following raw material components by weight percentage:

[0033] (1) 25-81% phase change material, preferably organic phase change material, selected from at least one of paraffin, fatty acid, fatty alcohol, and ester;

[0034] (2) 2.5-45% of a resin substrate, selected from at least one of polyethylene terephthalate resin, styrene-ethylene-butylene-styrene three-stage block copolymer, polypropylene, polyethylene, and polycarbonate;

[0035] (3) 0-4.5% of chopped fibers, preferably 0.5-3%, selected from at least one of glass fiber, carbon fiber, and quartz fiber;

[0036] (4) 0.5-5%, preferably 1-4%, of a gelling material, comprising at least one of sodium alginate, sodium carboxymethyl cellulose (CMC-Na), gelatin, chitosan (CTS), polysaccharide, and hyaluronic acid. The gelling material will subsequently gel the composite material as a whole, significantly reducing the risk of leakage of the product;

[0037] (5) 0.04-3.5% cross-linking agent for the gel raw material, preferably a metal salt cross-linking agent containing at least one of aluminum ion, calcium ion, iron ion, and zinc ion;

[0038] (6) 0.1-1% anti-mold and antibacterial agent is helpful to prevent the product from becoming moldy and deteriorating during use, thus extending the product life;

[0039] (7) Water 10-49%, which is beneficial to improving the thermal conductivity and flame retardancy of the product;

[0040] To effectively utilize the phase-change energy storage composite material, the present invention provides a bag product encapsulating the composite material. The bag product is selected from the group consisting of a hot water bottle, a heating cushion, a cooling cushion, a cooling pillow, a cooling mat, and a pet cooling pad. When used as the contents of a warming product such as a hot water bottle or a heating cushion, the composite material containing the organic phase-change material maintains the product's temperature at 40-65°C for 3-5 hours after heating using electrical heating, microwave heating, or other methods. When used as the contents of a cooling product such as a cooling cushion, a cooling pillow, a cooling mat, and a pet cooling pad, the composite material containing the organic phase-change material maintains the product's temperature at 20-32°C for 3-5 hours.

[0041] With respect to the phase-change energy storage composite material, the present invention provides a corresponding preparation method, which preferably comprises the following steps:

[0042] (1) Mix the organic phase change material, resin matrix and chopped fibers, heat and stir at 80-180°C for 2-10 minutes, and granulate to obtain a phase change masterbatch;

[0043] (2) The phase change masterbatch, gel raw material, water and mildew and antibacterial agent obtained in step (1) are stirred and mixed uniformly;

[0044] (3) Add a cross-linking agent, stir evenly, and let it stand until it is fully gelled to obtain the phase change energy storage composite material.

[0045] Example 1

[0046] The phase change energy storage composite material sample 1 of this embodiment includes the following raw material components:

[0047] Paraffin wax (56°C) 9g

[0048] PP 0.5g

[0049] SEBS 0.4g

[0050] Chopped glass fiber 0.1g

[0051] Sodium carboxymethyl cellulose 0.15g

[0052] Aluminum chloride hexahydrate 6mg

[0053] Antifungal and antibacterial agent 25mg

[0054] 2.35g water

[0055] The composite material sample of this embodiment was prepared by the following steps:

[0056] (1) Add paraffin wax, PP resin, SEBS resin and chopped glass fiber into a container and mix, heat and stir at 120°C for 10 minutes, and granulate to obtain phase change masterbatch;

[0057] (2) stirring and mixing the phase change masterbatch, sodium carboxymethyl cellulose, antifungal agent and water;

[0058] (3) Aluminum chloride hexahydrate cross-linking agent was then added and stirred evenly, and the mixture was allowed to stand until fully gelled, thereby obtaining a gelled phase change energy storage composite material sample 1.

[0059] The phase change enthalpy of sample 1 was 162 J / g. Sample 1 was packaged in a bag and heated to 60°C at 20°C before cooling to 40°C. The test measured the holding time 10 times, taking the average value. The result showed that the holding time for sample 1 was approximately 4.6 hours.

[0060] Example 2

[0061] The phase change energy storage composite material sample 2 of this embodiment includes the following raw material components:

[0062] Paraffin wax (56°C) 9g

[0063] PP 0.9g

[0064] Chopped glass fiber 0.1g

[0065] Sodium carboxymethyl cellulose 0.15g

[0066] Aluminum chloride hexahydrate 6mg

[0067] Antifungal and antibacterial agent 25mg

[0068] 2.35g water

[0069] The composite material sample of this embodiment was prepared by the following steps:

[0070] (1) Paraffin wax, PP resin and chopped glass fiber were added into a container and mixed, heated and stirred at 165°C for 5 minutes, and granulated to obtain phase change masterbatch;

[0071] (2) Stir and mix the phase change masterbatch, sodium carboxymethyl cellulose, mildew and antibacterial agent and water until uniform;

[0072] (3) Aluminum chloride hexahydrate cross-linking agent is then added and stirred evenly, and the mixture is allowed to stand until fully gelled to obtain the gelled phase change energy storage composite material.

[0073] The phase change enthalpy of sample 2 was 162 J / g. Sample 2 was packaged in a bag and heated to 60°C at 20°C before cooling to 40°C. The test was repeated 10 times and the average was taken. The average holding time for sample 2 was approximately 4.5 hours.

[0074] Example 3

[0075] The difference between Sample 3 of this embodiment and Example 1 is that the raw materials of the gel are different. The raw materials of the gel in Example 3 are 0.075g sodium carboxymethyl cellulose and 0.075g chitosan (DD=85%, molecular weight 8.8×10 5 , purchased from Jinan Haidebei) compound.

[0076] The phase change enthalpy of sample 3 was 162 J / g. Sample 3 was packaged in a bag and heated to 60°C at 20°C before cooling to 40°C. The test measured the holding time 10 times, taking the average value. The result showed that the holding time for sample 3 was approximately 4.7 hours.

[0077] Example 4

[0078] The phase change energy storage composite material sample 4 of this embodiment includes the following raw material components:

[0079] Paraffin wax (56°C) 8g

[0080] PP 1g

[0081] SEBS 0.9g

[0082] Chopped glass fiber 0.1g

[0083] Sodium carboxymethyl cellulose 0.15g

[0084] Aluminum chloride hexahydrate 6mg

[0085] Antifungal and antibacterial agent 25mg

[0086] 2.35g water

[0087] The preparation steps of the samples in this example are the same as those in Example 1.

[0088] The phase change enthalpy of sample 4 was 150 J / g. Sample 4 was packaged in a bag and heated to 60°C at 20°C before cooling to 40°C. The test measured the holding time 10 times, taking the average value. The result showed that the holding time of sample 4 was approximately 3.8 hours.

[0089] Example 5

[0090] The phase change energy storage composite material sample 5 of this embodiment includes the following raw material components:

[0091] Paraffin wax (56°C) 7g

[0092] PP 2.5g

[0093] SEBS 0.4g

[0094] Chopped glass fiber 0.1g

[0095] Sodium carboxymethyl cellulose 0.15g

[0096] Aluminum chloride hexahydrate 6mg

[0097] Antifungal and antibacterial agent 25mg

[0098] 2.35g water

[0099] The preparation steps of the samples in this example are the same as those in Example 1.

[0100] Composite material sample 6 had a phase change enthalpy of 130 J / g. Composite material sample 6 was packaged in a bag and heated to 60°C at 20°C before cooling to 40°C. The test measured its holding time, repeating this 10 times and taking the average value. The result showed that composite material sample 6 lasted approximately 3.5 hours.

[0101] Example 6

[0102] The phase change energy storage composite material sample 6 of this embodiment includes the following raw material components:

[0103] Paraffin wax (56°C) 6g

[0104] PP 3.5g

[0105] SEBS 0.4g

[0106] Chopped glass fiber 0.1g

[0107] Sodium carboxymethyl cellulose 0.15g

[0108] Aluminum chloride hexahydrate 6mg

[0109] Antifungal and antibacterial agent 25mg

[0110] 2.35g water

[0111] The preparation steps of the samples in this example are the same as those in Example 1.

[0112] The phase change enthalpy of sample 6 was 115 J / g. Sample 6 was packaged in a bag and heated to 60°C at 20°C before cooling to 40°C for a test of its holding time. This was repeated 10 times and the average value was taken. The holding time for sample 6 was approximately 3.2 hours.

[0113] Example 7

[0114] The phase change energy storage composite material sample 7 of this embodiment includes the following raw material components:

[0115] Paraffin wax (56°C) 5g

[0116] PP 4g

[0117] SEBS 0.9g

[0118] Chopped glass fiber 0.1g

[0119] Sodium carboxymethyl cellulose 0.15g

[0120] Aluminum chloride hexahydrate 6mg

[0121] Antifungal and antibacterial agent 25mg

[0122] 2.35g water

[0123] The preparation steps of the samples in this example are the same as those in Example 1.

[0124] The phase change enthalpy of sample 7 was 99 J / g. Sample 7 was packaged in a bag and heated to 60°C at 20°C before cooling to 40°C. The test was repeated 10 times and the average was taken. The test showed that the insulation time for sample 7 was approximately 3 hours.

[0125] Example 8

[0126] The phase change energy storage composite material sample 8 of this embodiment includes the following raw material components:

[0127] Paraffin wax (56°C) 9g

[0128] PE 0.5g

[0129] SEBS 0.4g

[0130] Chopped glass fiber 0.1g

[0131] Sodium carboxymethyl cellulose 0.15g

[0132] Aluminum chloride hexahydrate 6mg

[0133] Antifungal and antibacterial agent 25mg

[0134] 2.35g water

[0135] The sample of this embodiment was prepared by the following steps:

[0136] (1) Paraffin wax, PE resin, SEBS resin and chopped glass fiber were added into a container and mixed, heated and stirred at 120°C for 10 minutes, and granulated to obtain phase change masterbatch;

[0137] (2) Stir and mix the phase change masterbatch, sodium carboxymethyl cellulose, mildew and antibacterial agent and water until uniform;

[0138] (3) adding aluminum chloride hexahydrate as a cross-linking agent, stirring evenly, and allowing to stand until fully gelled to obtain a gelled composite material containing the organic phase change material.

[0139] The phase change enthalpy of sample 8 was 162 J / g. Sample 8 was packaged in a bag and heated to 60°C at 20°C before cooling to 40°C. The test was repeated 10 times and the average was taken. The average holding time for sample 8 was approximately 4.6 hours.

[0140] Example 9

[0141] The phase change energy storage composite material sample 9 of this embodiment includes the following raw material components:

[0142] Fatty acids (61°C) 9g

[0143] PP 0.5g

[0144] SEBS 0.4g

[0145] Chopped glass fiber 0.1g

[0146] Sodium carboxymethyl cellulose 0.15g

[0147] Aluminum chloride hexahydrate 6mg

[0148] Antifungal and antibacterial agent 25mg

[0149] 2.35g water

[0150] The preparation steps of the samples in this example are the same as those in Example 1.

[0151] Composite material sample 9 had a phase change enthalpy of 116 J / g. Sample 9 was packaged in a bag and heated to 60°C at 20°C before cooling to 40°C. The test measured its holding time, repeating this 10 times and taking the average value. The result showed that sample 9 lasted approximately 4 hours.

[0152] Example 10

[0153] The phase change energy storage composite material sample 10 of this embodiment includes the following raw material components:

[0154] Paraffin wax (28°C) 9g

[0155] PP 0.5g

[0156] SEBS 0.4g

[0157] Chopped glass fiber 0.1g

[0158] Sodium alginate 0.15g

[0159] Calcium chloride 10mg

[0160] Antifungal and antibacterial agent 25mg

[0161] 2.35g water

[0162] The preparation steps of the samples in this example are the same as those in Example 1.

[0163] The phase change enthalpy of sample 10 was 156 J / g. Sample 10 was packaged in a bag and moved from a 20°C environment to a 45°C environment. The cold retention time of sample 10, which was measured by heating from 20°C to 30°C, was repeated 10 times and the average value was taken. The cold retention time of sample 10 was approximately 4 hours.

[0164] Comparative Example 1

[0165] Comparative sample D1 contains the following raw material components:

[0166] Paraffin wax (56°C) 9g

[0167] PP 0.5g

[0168] SEBS 0.4g

[0169] Chopped glass fiber 0.1g

[0170] Antifungal and antibacterial agent 25mg

[0171] 2.5g water

[0172] The composition sample of this comparative example was prepared by the following steps:

[0173] (1) Add paraffin wax, PP resin, SEBS resin and chopped glass fiber into a container and mix, heat and stir at 120°C for 10 minutes, and granulate to obtain phase change masterbatch;

[0174] (2) The phase change masterbatch, antifungal agent and water were stirred and mixed uniformly to obtain comparative sample D1.

[0175] Comparative sample D1 had a phase change enthalpy of 161 J / g. Sample D1 was packaged in a bag and heated to 60°C at 20°C before cooling to 40°C. The test measured its holding time 10 times, taking the average value. The result showed that the holding time for Comparative sample D1 was approximately 2.2 hours.

[0176] Comparative Example 2

[0177] Comparative sample D2 contains the following raw material components:

[0178] PP 0.5g

[0179] SEBS 0.4g

[0180] Chopped glass fiber 0.1g

[0181] Antifungal and antibacterial agent 25mg

[0182] 11g water

[0183] The composition sample of this example was prepared by the following steps:

[0184] (1) Add PP resin, SEBS resin and chopped glass fiber into a container and mix, heat and stir at 120°C for 10 minutes, and granulate to obtain resin masterbatch;

[0185] (2) The resin masterbatch, antifungal agent and water were stirred and mixed uniformly to obtain comparative sample D2.

[0186] The comparative sample D2 was packaged into a bag product. At 20°C, it was heated to 60°C and then cooled to 40°C to test the insulation time. This was repeated 10 times and the average value was taken. The insulation time of the comparative sample D2 was about 0.83 hours.

[0187] The ingredients of each sample of Examples 1-10 and Comparative Examples 1 and 2 are shown in Table 1.

[0188] Table 1

[0189]

[0190] The test results of the phase change enthalpy values ​​and relative exothermic / endothermic time of Examples 1-10 and Comparative Examples 1 and 2 are shown in Table 2.

[0191] Table 2

[0192]

[0193] The comparative results of the heat release tests of Sample 1, Comparative Sample D1 and Comparative Sample D2 are shown in FIG1 .

[0194] The samples of Examples 1-10, leveraging the advantages of organic phase change materials such as high latent heat of phase change and good thermal stability, exhibited excellent thermal insulation and cold-retention properties, providing a longer heat absorption / release period. Furthermore, by utilizing a resin matrix with good compatibility with the phase change material and adding chopped fiber reinforcement, the energy storage uniformity, stability, and durability of the composite material were effectively improved. During the above-mentioned testing process, the samples of the Examples essentially maintained their original shape. Furthermore, the phase change masterbatch was stably dispersed in the cross-linked aqueous gel, which was safe and stable, effectively improving the fluidity and user comfort of the composite material, and also contributing to improving the overall thermal conductivity and flame retardancy of the composite material.

[0195] In comparison, Sample D1 in Comparative Example 1, which does not use a gel raw material, exhibits a high phase change enthalpy, but its relative heat release / absorption duration is insufficient, making it difficult to meet energy storage requirements. Sample D2 in Comparative Example 2, lacking either a phase change material or a gel raw material, is equivalent to an ordinary aqueous energy storage medium, lacking sufficient energy storage capacity and stable heat supply capabilities, and posing potential safety risks. Furthermore, as can be seen from the heat release curves in Figure 1, Sample D2 exhibits an excessively high heat release rate, while Sample D1 also exhibits excessive heat release after an initial stabilization period, failing to meet actual long-term, stable energy storage requirements.

[0196] The above introduces the preferred embodiments of the present invention, which is intended to make the spirit of the present invention clearer and easier to understand, and is not intended to limit the present invention. Any modifications, replacements, and improvements made within the spirit and principles of the present invention should be included in the scope of protection outlined by the claims attached to the present invention.

Claims

1. A phase change energy storage composite material, characterized in that, by weight percentage, it comprises the following raw material components: Phase change material 25 - 81% Resin substrate 2.5 - 45% Chopped fiber 0 - 4.5% Gel raw material 0.5 - 5% Water 10 - 49%.

2. The phase change energy storage composite material according to claim 1, characterized in that, the phase change material comprises an organic phase change material, selected from at least one of paraffin, fatty acid, fatty alcohol, and ester.

3. The phase change energy storage composite material according to claim 1 or 2, characterized in that, the resin substrate is selected from at least one of polyethylene terephthalate resin, styrene - ethylene - butene - styrene triblock copolymer, polypropylene, polyethylene, and polycarbonate.

4. The phase change energy storage composite material according to claim 3, characterized in that, the gel raw material comprises at least one of sodium alginate, sodium carboxymethyl cellulose, gelatin, chitosan, polysaccharide, and hyaluronic acid, and the phase change energy storage composite material further comprises a cross - linker with a weight percentage of 0.04 - 3.5%.

5. The phase change energy storage composite material according to claim 4, characterized in that, the cross - linker comprises a metal salt cross - linker, and the metal salt cross - linker comprises at least one of aluminum ions, calcium ions, iron ions, and zinc ions.

6. The phase change energy storage composite material according to claim 4 or 5, characterized in that, the weight percentage of the chopped fiber is 0.5 - 3%, and it is selected from at least one of glass fiber, carbon fiber, and quartz fiber.

7. The phase change energy storage composite material according to claim 4 or 5, characterized in that, the phase change energy storage composite material further comprises a mildew - proof and antibacterial agent with a weight percentage of 0.1 - 1%.

8. A preparation method of the phase change energy storage composite material according to claims 1 - 7, characterized in that, it comprises the following steps: (1) Mix the phase change material, resin substrate, and optional chopped fiber, heat and stir at 80 - 180 °C for 2 - 10 min, and granulate to obtain a phase change masterbatch; (2) Stir and mix the phase change masterbatch obtained in step (1), gel raw material, water, and optional mildew - proof and antibacterial agent evenly; (3) Add the optional cross - linker, stir evenly, and stand until fully gelated to obtain the phase change energy storage composite material.

9. A bag product encapsulated with the phase change energy storage composite material according to claims 1 - 7, characterized in that, the bag product is one of a hot water bag, a heating cushion, a cooling cushion, a cooling pillow, a cooling mat, and a pet ice pad.

10. The bag product according to claim 9, characterized in that, after heating, the phase change energy storage composite material keeps the temperature of the hot water bag and heating cushion at 40 - 65 °C for 3 - 5 h; or keeps the temperature of the cooling cushion, cooling pillow, cooling mat, and pet ice pad at 20 - 32 °C for 3 - 5 h.

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