Leak-proof high-elasticity phase change gel ice bag material and preparation method thereof
By constructing a synergistic modified polymer matrix of polyvinyl alcohol and sodium alginate, introducing calcium chloride and sorbitol to form a dual physical cross-linking network with multi-point hydrogen bonding, and combining inositol to regulate the state of water molecules, the problems of insufficient elastic recovery and leakage risk of existing gel ice pack materials under repeated freezing-thawing and pressure are solved, achieving a balance between high elasticity and stable phase transition.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HANGZHOU HUABING NEW MATERIAL TECH CO LTD
- Filing Date
- 2026-04-08
- Publication Date
- 2026-06-30
AI Technical Summary
Existing phase change gel ice pack materials have insufficient elastic recovery ability during repeated freezing-thawing and pressure use. The phase change cold storage medium is prone to migration and precipitation and there is a risk of leakage. Existing modification methods cannot achieve both high elasticity and phase change stability.
By constructing a synergistic modified polymer matrix of polyvinyl alcohol and sodium alginate, introducing calcium chloride and sorbitol to form a synergistic effect, and adding inositol as an organic small molecule structure regulator to form a double physical cross-linking network with multi-point hydrogen bonding, combined with polyol humectants and inorganic stabilizers, a phase change cold storage medium is uniformly dispersed to construct a leak-proof, highly elastic phase change gel bag material.
It significantly improves the structural stability and elastic recovery of gel ice pack materials under pressure and repeated freeze-thaw conditions, reduces the risk of migration and leakage of phase change cold storage media, and maintains the stability and repeatability of phase change performance.
Smart Images
Figure CN122302830A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of phase change energy storage materials and polymer gel materials, specifically to a leak-proof, highly elastic phase change gel ice pack material and its preparation method. Background Technology
[0002] Phase change gel ice packs have been widely used in cold chain transportation, medical cooling, fresh food preservation, and daily cooling applications due to their ability to absorb or release large amounts of heat during phase change, as well as their ease of use and high safety. Existing phase change gel ice pack materials typically use water, inorganic hydrated salts, or organic phase change materials as the phase change cooling medium, and construct a gel structure using polymers such as polyvinyl alcohol, polyacrylate, and natural polysaccharides to restrict the flow of the phase change medium.
[0003] However, existing technical solutions still generally have the following shortcomings: On the one hand, the gel network structure is mostly a single physical cross-linking or simple chemical cross-linking form. Under repeated freezing-thawing or pressure and bending conditions, the gel structure is easily damaged and has insufficient elastic recovery ability, resulting in a decrease in the overall integrity of the material. On the other hand, phase change cold storage media are prone to migration, water separation or local enrichment during the phase change process. Once the outer packaging is damaged, the internal phase change media is prone to leakage, posing a risk of pollution and limiting its safe application in the medical and cold chain fields.
[0004] To improve the mechanical properties or leak-proof performance of gels, some existing technologies enhance the gel structure by increasing the crosslinking density or introducing inorganic fillers. However, this often leads to increased brittleness and decreased phase change efficiency, making it difficult to achieve a balance between high elasticity and stable phase change performance. Furthermore, most modification methods used in existing phase change gel ice pack materials remain at the level of single-component modification, lacking a system design with multi-component synergistic effects. The application of small organic molecules capable of regulating the binding state of water molecules in the gel and playing a stabilizing role during phase change is also relatively rare in this field.
[0005] Therefore, how to construct phase change gel ice pack materials that combine high elasticity, resistance to repeated freeze-thaw cycles, and leak-proof properties through reasonable material design and synergistic modification of components while ensuring phase change cold storage performance remains a technical problem that urgently needs to be solved in this field. Summary of the Invention
[0006] To overcome the challenges of insufficient elastic recovery in phase change gel ice pack materials during repeated freeze-thaw cycles and pressure application, the easy migration and precipitation of the phase change cold storage medium posing a leakage risk, and the difficulty in balancing high elasticity and phase change stability in existing modification methods, this invention aims to provide a leak-proof, highly elastic phase change gel ice pack material and its preparation method. This invention constructs a synergistically modified polymer matrix composed of polyvinyl alcohol and sodium alginate, introduces calcium chloride and sorbitol to form a synergistic effect, and adds inositol as an organic small molecule structure regulator to the phase change gel system. This ensures that the phase change cold storage medium, polyol humectant, and inorganic stabilizing agent are uniformly dispersed and stably exist in the polymer network, thereby obtaining a leak-proof, highly elastic phase change gel ice pack material. This invention significantly improves the structural stability and elastic recovery of the gel ice pack material under pressure and repeated freeze-thaw conditions while ensuring phase change cold storage performance, effectively reducing the risk of phase change cold storage medium migration and leakage.
[0007] The objective of this invention can be achieved through the following technical solutions: A leak-proof, highly elastic phase change gel ice pack material, comprising the following raw materials in parts by weight: 60-85 parts of a synergistically modified polymer matrix; 40-80 parts of a phase change cold storage medium; 0.1-3.0 parts of an organic small molecule structure regulator; 1.0-10.0 parts of a polyol humectant; 0.1-5.0 parts of an inorganic stabilizing agent; and 50-200 parts of deionized water; wherein the synergistically modified polymer matrix is cross-linked with polyols through ionic cross-linking induced by a divalent metal salt ion cross-linking agent. The synergistic effect of hydrogen bonding induced by hydroxyl small molecule co-associative agents constructs a dual physical cross-linked network structure with energy dissipation characteristics between polyvinyl alcohol and sodium alginate. The organic small molecule structure regulator is inositol, which inhibits the migration and precipitation of the phase change cold storage medium during the phase change process by regulating the binding state of water molecules in the gel system and participating in the multi-point hydrogen bonding of the dual physical cross-linked network. This significantly improves the integrity of the gel structure and the leakage prevention performance under pressure, damage or repeated freeze-thaw conditions.
[0008] Optionally, the synergistically modified polymer matrix includes the following raw materials in parts by weight: 50-75 parts of polyvinyl alcohol; 15-35 parts of sodium alginate; 0.2-3.0 parts of calcium chloride; and 0.5-5.0 parts of sorbitol.
[0009] Optionally, the preparation method of the synergistically modified polymer matrix includes the following steps: (1) Add polyvinyl alcohol to deionized water and stir under heating conditions to dissolve it, so as to obtain a homogeneous polyvinyl alcohol solution; (2) Add sodium alginate to a homogeneous polyvinyl alcohol solution and disperse it fully under stirring conditions to obtain a homogeneous composite polymer dispersion system. (3) Add sorbitol to a uniform composite polymer dispersion system and stir to mix. Then add calcium chloride aqueous solution and react under stirring conditions to form a stable synergistic modified polymer matrix.
[0010] Optionally, the reaction conditions for step (1) are stirring and dissolving at 80–95°C for 20–60 min.
[0011] Optionally, the reaction conditions in step (2) are stirring and dispersing at 50-80°C for 10-40 minutes.
[0012] Optionally, the reaction conditions in step (3) are: at room temperature and under stirring for 10 to 40 minutes.
[0013] Optionally, the phase change cold storage medium is a mixture of deionized water and sodium sulfate decahydrate in a mass ratio of 9:1, the polyol humectant is a mixture of glycerin and propylene glycol in a mass ratio of 1:1, and the inorganic stabilizing agent is a mixture of silica and attapulgite in a mass ratio of 1:2.
[0014] Optionally, a method for preparing a leak-proof, highly elastic phase change gel ice pack material includes the following steps: S1, add phase change cold storage medium, polyol humectant and inorganic stabilizer to the synergistically modified polymer matrix, mix under stirring conditions, so that the phase change cold storage medium is uniformly dispersed in the synergistically modified polymer matrix; S2, the treated system is cooled and allowed to stand, so that the system forms a structurally stable, leak-proof, highly elastic phase change gel, thereby obtaining a leak-proof, highly elastic phase change gel ice pack material.
[0015] 9. The method for preparing a leak-proof, highly elastic phase change gel ice pack material according to claim 8, characterized in that the reaction conditions of step S1 are mixing for 10-40 minutes under stirring at room temperature.
[0016] Optionally, the reaction conditions for step S2 are to allow the gel to stand at 5–25°C for 20–120 min.
[0017] The beneficial effects of this invention are: This invention introduces calcium chloride and sorbitol into a polymer system composed of polyvinyl alcohol and sodium alginate to form a synergistically modified polymer matrix. For the first time, inositol is applied as an organic small molecule structure regulator in phase change gel ice pack materials, enabling the formation of a stable, multi-point network structure with energy dissipation characteristics within the gel. This allows the material to maintain good structural integrity and elastic recovery performance even under external pressure or repeated freeze-thaw cycles. Simultaneously, inositol's regulation of the water molecule binding state in the gel system effectively inhibits the migration and water separation of the phase change storage medium during the phase change process, significantly reducing the risk of leakage under pressure or packaging damage. Through the synergistic effect of the phase change storage medium, polyol humectant, and inorganic stabilizing agent, the stability and repeatability of the phase change process are improved without significantly reducing the latent heat of phase change. The resulting leak-proof, highly elastic phase change gel ice pack material possesses high elasticity, leak-proof properties, and stable cold storage performance, demonstrating good engineering feasibility and application value. Attached Figure Description
[0018] The invention will now be further described with reference to the accompanying drawings.
[0019] Figure 1 A comparison of the infrared spectra of the polymer matrix and the synergistically modified polymer matrix; Figure 2 A comparison chart of the elastic recovery performance test results for samples with different ratios; Figure 3 A comparison chart of leak-proof performance test results for samples with different mixing ratios; Figure 4 A comparison chart showing the freeze-thaw stability test results of samples with different ratios and the dispersion stability test results of the phase change system. Detailed Implementation
[0020] The present invention will be further described below with reference to specific embodiments. However, the present invention is not limited to the following embodiments. Equivalent adjustments made without departing from the spirit and essence of the present invention should also be considered to fall within the protection scope of the present invention.
[0021] Example 1
[0022] This embodiment aims to verify that when the content of each component and the reaction conditions are taken at the lower limit of the allowable range of the claims, the resulting phase change gel ice pack material can still form a stable gel structure and has basic leak-proof and elastic recovery properties.
[0023] Preparation method S1, Preparation of synergistically modified polymer matrix Polyvinyl alcohol (PVA) was added to deionized water and stirred at 80°C for 20 min to obtain a homogeneous PVA solution. Sodium alginate was added to the obtained PVA solution and stirred at 50°C for 10 min to obtain a homogeneous composite polymer dispersion system. Sorbitol was then added to the composite polymer dispersion system and stirred to mix. Calcium chloride aqueous solution was then added, and the mixture was stirred at room temperature for 10 min to obtain a synergistically modified polymer matrix. Figure 1 The infrared spectrum comparison shows that the unmodified sample has a wavelength range of 3200–3500 cm⁻¹. -1 The modified sample exhibits a broad -OH stretching vibration absorption peak, originating from the hydroxyl structures in polyvinyl alcohol and sodium alginate molecules. After modification, the peak intensity significantly increases and broadens further, indicating a substantial increase in the number of hydroxyl groups and hydrogen bonding in the system after the introduction of sorbitol. The modified sample shows an absorption peak at 1600 cm⁻¹. -1 Left and right -COO - Asymmetric stretching vibration peak and 1400cm -1 The nearby symmetric stretching vibration peaks showed a slight shift and increased intensity, reflecting a change in the carboxylate environment after calcium chloride involvement; in the range of 1150–1020 cm⁻¹ -1 In the modified range, the COC / CO related absorption peaks were significantly enhanced, indicating that the multi-hydroxyl small molecules were successfully introduced and participated in the system structure construction; the chemical environment inside the polymer matrix changed significantly after synergistic modification, and the modification effect was effectively confirmed by infrared spectroscopy. S2, Introduction of phase change system and gelation A phase change cold storage medium, a polyol humectant, and an inorganic stabilizer were added to the above-mentioned synergistically modified polymer matrix. The mixture was stirred and mixed at room temperature for 10 minutes to ensure uniform dispersion of the phase change cold storage medium. Subsequently, the mixture was placed at 5°C and allowed to stand for 20 minutes to form a gel, resulting in a leak-proof, highly elastic phase change gel ice pack material.
[0024] Example 2
[0025] This embodiment aims to verify the synergistic effect between the modified polymer matrix and the phase change system when the content of each component and the reaction conditions are taken as intermediate values, as well as the comprehensive performance of the obtained phase change gel ice pack material in terms of elastic recovery and leak prevention.
[0026] Preparation method Preparation of S1 synergistically modified polymer matrix Polyvinyl alcohol was added to deionized water and stirred at 87°C for 40 min to obtain a homogeneous polyvinyl alcohol solution. Sodium alginate was added to the obtained polyvinyl alcohol solution and stirred and dispersed at 65°C for 25 min to obtain a homogeneous composite polymer dispersion system. Sorbitol was then added to the composite polymer dispersion system and stirred and mixed. Calcium chloride aqueous solution was then added and stirred and reacted at room temperature for 25 min to obtain a synergistically modified polymer matrix. S2, Introduction of phase change system and gelation A phase change cold storage medium, a polyol humectant, and an inorganic stabilizer were added to the synergistically modified polymer matrix. The mixture was stirred and mixed at room temperature for 25 minutes to ensure uniform dispersion of the phase change cold storage medium. Subsequently, the mixture was placed at 15°C and allowed to stand for 60 minutes to form a stable gel, resulting in a leak-proof, highly elastic phase change gel ice pack material.
[0027] Example 3
[0028] This embodiment aims to verify the ultimate applicability of the phase change gel ice pack material in terms of structural stability, deformation resistance, and leak prevention performance when the content of each component and the reaction conditions are taken to the upper limit of the allowable range of the claims.
[0029] Preparation method S1, Preparation of synergistically modified polymer matrix Polyvinyl alcohol was added to deionized water and stirred at 95°C for 60 min to obtain a homogeneous polyvinyl alcohol solution. Sodium alginate was added to the obtained polyvinyl alcohol solution and stirred and dispersed at 80°C for 40 min to obtain a homogeneous composite polymer dispersion system. Sorbitol was then added to the composite polymer dispersion system and stirred and mixed. Calcium chloride aqueous solution was then added and stirred and reacted at room temperature for 40 min to obtain a synergistically modified polymer matrix. S2, Introduction of phase change system and gelation A phase change cold storage medium, a polyol humectant, and an inorganic stabilizer were added to the synergistically modified polymer matrix. The mixture was stirred and mixed at room temperature for 40 minutes to fully disperse the phase change cold storage medium. The mixture was then placed at 25°C and allowed to stand for 120 minutes to allow the system to fully gel, resulting in a leak-proof, highly elastic phase change gel ice pack material.
[0030] Comparative Example 1: This comparative example aims to verify the effect of using only calcium chloride to ion crosslink the polyvinyl alcohol / sodium alginate system without introducing sorbitol for synergistic association on the stability of the synergistically modified polymer matrix and the elastic recovery and leak-proof performance of the resulting phase change gel ice pack material.
[0031] Preparation method S1, Preparation of synergistically modified polymer matrix Polyvinyl alcohol was added to deionized water and stirred at 87°C for 40 min to obtain a homogeneous polyvinyl alcohol solution. Sodium alginate was added to the obtained polyvinyl alcohol solution and stirred at 65°C for 25 min to obtain a homogeneous composite polymer dispersion system. Subsequently, calcium chloride aqueous solution was added directly and stirred at room temperature for 25 min to obtain a synergistically modified polymer matrix. S2, Introduction of phase change system and gelation A phase change cold storage medium, an organic small molecule structure regulator, a polyol humectant, and an inorganic stabilizer were added to the synergistically modified polymer matrix. The mixture was stirred and mixed at room temperature for 25 minutes to ensure uniform dispersion of the phase change cold storage medium. Subsequently, the mixture was placed at 15°C and allowed to stand for 60 minutes to form a stable gel, thus obtaining the phase change gel ice pack material.
[0032] Comparative Example 2: This comparative example aims to verify the effect of introducing only sorbitol to regulate the multi-point association of the polyvinyl alcohol / sodium alginate system without introducing calcium chloride ion crosslinking on the stability of the synergistically modified polymer matrix and the elastic recovery and leak-proof performance of the resulting phase change gel ice pack material.
[0033] Preparation method S1, Preparation of synergistically modified polymer matrix Polyvinyl alcohol was added to deionized water and stirred at 87°C for 40 min to obtain a homogeneous polyvinyl alcohol solution. Sodium alginate was added to the obtained polyvinyl alcohol solution and stirred and dispersed at 65°C for 25 min to obtain a homogeneous composite polymer dispersion system. Sorbitol was then added to the composite polymer dispersion system and stirred and mixed. The mixture was stirred and reacted at room temperature for 25 min to obtain a synergistically modified polymer matrix. S2, Introduction of phase change system and gelation A phase change cold storage medium, an organic small molecule structure regulator, a polyol humectant, and an inorganic stabilizer were added to the synergistically modified polymer matrix. The mixture was stirred and mixed at room temperature for 25 minutes to ensure uniform dispersion of the phase change cold storage medium. Subsequently, the mixture was placed at 15°C and allowed to stand for 60 minutes to form a stable gel, thus obtaining the phase change gel ice pack material.
[0034] Comparative Example 3: This comparative example aims to verify the stability changes of the synergistically modified polymer matrix and phase change system without the addition of the organic small molecule structure modifier inositol, as well as the contribution of inositol to inhibit the migration and precipitation of the phase change cold storage medium during the phase change process, and to improve elastic recovery and leakage prevention performance.
[0035] Preparation method S1, Preparation of synergistically modified polymer matrix Polyvinyl alcohol was added to deionized water and stirred at 87°C for 40 min to obtain a homogeneous polyvinyl alcohol solution. Sodium alginate was added to the obtained polyvinyl alcohol solution and stirred and dispersed at 65°C for 25 min to obtain a homogeneous composite polymer dispersion system. Sorbitol was then added to the composite polymer dispersion system and stirred and mixed. Calcium chloride aqueous solution was then added and stirred and reacted at room temperature for 25 min to obtain a synergistically modified polymer matrix. S2, Introduction of phase change system and gelation A phase change cold storage medium, a polyol humectant, and an inorganic stabilizer were added to the synergistically modified polymer matrix. The mixture was stirred and mixed at room temperature for 25 minutes to ensure uniform dispersion of the phase change cold storage medium. Subsequently, the mixture was placed at 15°C and allowed to stand for 60 minutes to form a stable gel, thus obtaining the phase change gel ice pack material.
[0036] Performance testing: 1. Elastic recovery performance test method The leak-proof high-elasticity phase change gel ice pack materials obtained in Examples 1, 2, 3 and Comparative Examples 1-3 were prepared into samples of the same size. The samples were subjected to the same degree of compression deformation at room temperature, and the external force was released after the samples produced obvious deformation. The compression-release operation was repeated multiple times, and the morphological changes of the samples were observed after each release to evaluate the deformation recovery ability of the samples under pressure and the structural stability under repeated pressure.
[0037] 2. Leakage prevention performance test method The samples obtained in Examples 1, 2, 3 and Comparative Examples 1 to 3 were placed in flexible packaging bags of the same specifications, and the surface of the packaging bags was partially damaged. Then, the samples were subjected to the same load and squeezed. During and after the squeezing process, the phase change cold storage medium was observed to seep out, flow or overflow, so as to evaluate the leakage prevention performance of the samples under packaging damage and pressure conditions.
[0038] 3. Freeze-thaw stability test method The samples obtained in Examples 1, 2, 3 and Comparative Examples 1 to 3 were placed in a low-temperature environment for freezing treatment. After freezing, they were transferred to room temperature for thawing to complete one freeze-thaw cycle. Multiple freeze-thaw cycles were repeated, and the appearance, overall morphological changes and whether water separation or stratification occurred were observed after each cycle to evaluate the structural stability of the samples under repeated freeze-thaw conditions.
[0039] 4. Test methods for the dispersion stability of phase change systems The samples obtained in Examples 1, 2, 3 and Comparative Examples 1 to 3 were left to stand without any external force. The samples were observed at different time points, and the distribution of the phase change cold storage medium in the gel system was recorded. The focus was on observing whether local enrichment, stratification or migration occurred, so as to evaluate the dispersion stability of the phase change cold storage medium in the gel system.
[0040] Table 1 Comparison of Test Results sample Elastic recovery rate (%) Leakage under pressure (g) Water separation rate after freeze-thaw cycle (%) Phase change medium mobility (%) Example 1 82 0.15 3.8 4.2 Example 2 94 0.02 0.6 0.8 Example 3 88 0.08 1.2 1.5 Comparative Example 1 65 0.45 8.6 9.2 Comparative Example 2 58 0.78 12.4 13.6 Comparative Example 3 46 1.35 18.9 21.4 As shown in Table 1, different samples exhibited significant differences in performance indicators such as elastic recovery rate, pressure leakage, water separation rate after freeze-thaw cycles, and phase change medium migration rate. Furthermore, a clear and reasonable performance gradient distribution was observed between the examples and comparative examples. Example 2 achieved the best data in all four performance indicators, while Examples 1 and 3 showed significantly better overall performance than the comparative examples, fully demonstrating the comprehensive performance advantages of the present invention.
[0041] In terms of elastic recovery performance, Figure 2 The elastic recovery rate of Example 2 reached 94%, significantly higher than that of Example 3 (88%) and Example 1 (82%). In contrast, the elastic recovery rates of Comparative Examples 1, 2, and 3 were only 65%, 58%, and 46%, respectively. These results indicate that, under the combined action of synergistic modification of the polymer matrix and organic small molecule structure regulator, the gel system can achieve more complete deformation recovery after compression, while the resilience of the material is significantly limited when only one modification is performed or when key components are lacking.
[0042] In terms of leak prevention performance, the data on leakage under pressure can intuitively reflect the ability of each sample to constrain the phase change cold storage medium under pressure. Figure 3 The pressure leakage of Example 2 was only 0.02g, while that of Examples 3 and 1 was 0.08g and 0.15g, respectively, both at relatively low levels. In contrast, the pressure leakage of Comparative Examples 1, 2, and 3 increased to 0.45g, 0.78g, and 1.35g, respectively. This demonstrates that the synergistic modified structure constructed in this invention can significantly reduce the leakage risk of phase change media under pressure.
[0043] Regarding freeze-thaw stability, the test results of the water separation rate after freeze-thaw cycles showed that... Figure 4 The lowest water separation rate was observed in Example 2, at only 0.6%, compared to 1.2% in Example 3 and 3.8% in Example 1. In contrast, the water separation rates of the comparative samples were significantly higher, with Comparative Example 1 at 8.6%, Comparative Example 2 at 12.4%, and Comparative Example 3 reaching as high as 18.9%. These results indicate that the synergistically modified polymer network can effectively buffer the structural damage generated during freeze-thaw cycles, thereby significantly improving the freeze-thaw stability of the material.
[0044] Regarding the dispersion stability of the phase change system, the data on the migration rate of the phase change medium after standing further verified the advantages of the system in the example. Figure 4 The phase change medium mobility in Example 2 was only 0.8%, while that in Example 3 and Example 1 was 1.5% and 4.2% respectively, all remaining at a low level; whereas the mobility of Comparative Example 1, Comparative Example 2 and Comparative Example 3 increased to 9.2%, 13.6% and 21.4% respectively, indicating that their ability to fix phase change cold storage medium was significantly insufficient.
[0045] In summary, the specific data in Table 1 fully demonstrate that the present invention, through synergistic modification of the polymer matrix and the introduction of organic small molecule structure regulators, has achieved significant improvements in elastic recovery performance, leak prevention performance, freeze-thaw stability, and dispersion stability of the phase change system. Among them, Example 2 exhibits the best comprehensive performance in all indicators, verifying the effectiveness and rationality of the technical solution of the present invention.
Claims
1. A leak-proof, highly elastic phase change gel ice pack material, characterized in that, The leak-proof, highly elastic phase change gel ice pack material comprises the following raw materials in parts by weight: 60-85 parts of synergistically modified polymer matrix; 40-80 parts of phase change cold storage medium; 0.1-3.0 parts of organic small molecule structure regulator; 1.0-10.0 parts of polyol humectant; 0.1-5.0 parts of inorganic stabilizing agent; and 50-200 parts of deionized water. The synergistically modified polymer matrix, through the synergistic effect of ionic crosslinking induced by divalent metal salt ion crosslinking agent and hydrogen bonding induced by polyhydroxy small molecule synergistic associating agent, constructs a dual physical crosslinking network structure with energy dissipation characteristics between polyvinyl alcohol and sodium alginate. The organic small molecule structure regulator is inositol, which, by regulating the binding state of water molecules in the gel system and participating in the multi-point hydrogen bonding of the dual physical crosslinking network, inhibits the migration and precipitation of the phase change cold storage medium during the phase change process.
2. The leak-proof, highly elastic phase change gel ice pack material according to claim 1, characterized in that, The synergistically modified polymer matrix comprises the following raw materials in parts by weight: 50-75 parts polyvinyl alcohol; 15-35 parts sodium alginate; 0.2-3.0 parts calcium chloride; and 0.5-5.0 parts sorbitol.
3. The leak-proof, highly elastic phase change gel ice pack material according to claim 1 or 2, characterized in that, The method for preparing the synergistically modified polymer matrix includes the following steps: (1) Add polyvinyl alcohol to deionized water and stir under heating conditions to dissolve it, so as to obtain a homogeneous polyvinyl alcohol solution; (2) Add sodium alginate to a homogeneous polyvinyl alcohol solution and disperse it fully under stirring conditions to obtain a homogeneous composite polymer dispersion system. (3) Add sorbitol to a uniform composite polymer dispersion system and stir to mix. Then add calcium chloride aqueous solution and react under stirring conditions to form a stable synergistic modified polymer matrix.
4. The leak-proof, highly elastic phase change gel ice pack material according to claim 3, characterized in that, The reaction conditions for step (1) are stirring and dissolving at 80-95°C for 20-60 minutes.
5. The leak-proof, highly elastic phase change gel ice pack material according to claim 3, characterized in that, The reaction conditions for step (2) are stirring and dispersing at 50-80°C for 10-40 minutes.
6. The leak-proof, highly elastic phase change gel ice pack material according to claim 3, characterized in that, The reaction conditions for step (3) are: at room temperature, under stirring, for 10 to 40 minutes.
7. The leak-proof, highly elastic phase change gel ice pack material according to claim 1, characterized in that, The phase change cold storage medium is composed of deionized water and sodium sulfate decahydrate in a mass ratio of 9:1, the polyol humectant is composed of glycerin and propylene glycol in a mass ratio of 1:1, and the inorganic stabilizing agent is composed of silica and attapulgite in a mass ratio of 1:
2.
8. A method for preparing a leak-proof, highly elastic phase change gel ice pack material, characterized in that, The preparation method includes the following steps: S1, a phase change cold storage medium, a polyol humectant, and an inorganic stabilizer are added to the synergistically modified polymer matrix and mixed under stirring conditions; S2, the treated system is cooled and allowed to stand, so that the system forms a structurally stable, leak-proof, highly elastic phase change gel, thereby obtaining a leak-proof, highly elastic phase change gel ice pack material.
9. The method for preparing a leak-proof, highly elastic phase change gel ice pack material according to claim 8, characterized in that, The reaction conditions for step S1 are: mixing at room temperature and under stirring for 10 to 40 minutes.
10. The method for preparing a leak-proof, highly elastic phase change gel ice pack material according to claim 8, characterized in that, The reaction conditions for step S2 are: standing at 5–25°C for 20–120 minutes to form a gel.