High-strength recoverable high-heat-preservation mulching film and preparation method thereof

Abstract

The invention relates to the technical field of mulching film preparation, and particularly discloses a high-strength recyclable high-heat-preservation mulching film and a preparation method thereof. The high-strength recyclable high-heat-preservation mulching film comprises the following raw materials in parts by weight: 65-75 parts of polyethylene, 5-10 parts of a cationic starch solution, 15-20 parts of a composite phase change material, 0.3-0.7 part of an antioxidant and 0.5-1.1 parts of a light stabilizer, wherein the composite phase change material is a silver-plated expanded graphite / modified paraffin composite phase change material. The high-strength recoverable high-heat-preservation mulching film has the advantage that the defect that the mechanical property and the heat preservation property of the mulching film are still insufficient can be overcome.

Description

Technical Field

[0001] The present application relates to the technical field of ground film preparation, and more specifically, to a high-strength, recyclable, and high-insulation ground film and a preparation method thereof. Background Art

[0002] With the acceleration of global agricultural modernization and intensification, mulch film technology, as an important means of increasing agricultural production and efficiency, has been widely used in dryland agriculture, water-scarce areas and facility agriculture. By covering the surface, mulch film can effectively increase soil temperature, reduce water evaporation, and inhibit weed growth, thereby significantly improving the crop rhizosphere environment and thereby increasing crop yield and quality.

[0003] Polyethylene mulch is the most common type of mulch. At present, my country has become the country that uses the most polyethylene mulch in the world. However, under harsh environmental conditions such as strong ultraviolet radiation, high temperature and humidity, the long-chain structure of polyethylene mulch is prone to photooxidation and thermal oxidation degradation, resulting in structural changes such as polymer chain breakage and cross-linking, which causes the mechanical properties and thermal insulation properties of the mulch to deteriorate rapidly. Summary of the Invention

[0004] In order to improve the mechanical properties and thermal insulation properties of ground films, which are still insufficient, the present application provides a high-strength, recyclable and high-thermal insulation ground film and a preparation method thereof.

[0005] In the first aspect, the present application provides a high-strength, recyclable, and high-insulation ground film, which adopts the following technical solutions: A high-strength, recyclable, and high-insulation ground film, comprising the following raw materials in parts by weight: 65-75 parts of polyethylene, 5-10 parts of cationic starch solution, 15-20 parts of a composite phase change material, 0.3-0.7 parts of an antioxidant, and 0.5-1.1 parts of a light stabilizer; Wherein, the composite phase change material is a silver-plated expanded graphite / modified paraffin composite phase change material.

[0006] Since polar groups such as hydroxyl groups in cationic starch molecules can form hydrogen bonds with the surface of polyethylene and composite phase change materials, it is beneficial to improve the compatibility between components and reduce interface defects. At the same time, the film-forming and adhesive properties of starch enhance the bonding force between raw materials, making the film structure denser and the stress distribution more uniform when subjected to force, which is beneficial to improving the overall mechanical properties.

[0007] The silver-plated expanded graphite in the composite phase change material has a porous structure, which bears part of the external force through the skeleton effect, disperses the stress concentration points, and further improves the overall mechanical properties of the ground film. At the same time, the modified paraffin in the composite phase change material is the core heat storage component. Its phase change characteristics can absorb heat when the ambient temperature rises and release heat when the temperature drops, forming a temperature buffer, reducing soil temperature fluctuations, and is conducive to achieving high thermal insulation performance. In the silver-plated expanded graphite, the silver layer has excellent thermal conductivity and can quickly transfer heat, accelerating the heat storage and heat release of the modified paraffin. The porous structure of the expanded graphite provides a stable carrier for the modified paraffin, which is conducive to the long-term effectiveness of the modified paraffin heat storage function.

[0008] Preferably, the modified paraffin wax is titanium dioxide wrapped slice paraffin wax.

[0009] Due to the stability of titanium dioxide, after wrapping titanium dioxide on the surface of sliced ​​paraffin, it can perform a protective film, thereby reducing the leakage of sliced ​​paraffin in high temperature environment, thereby improving the morphological stability and high thermal insulation of sliced ​​paraffin. At the same time, titanium dioxide has good light reflection and ultraviolet shielding functions, which is beneficial to improve the light-heat conversion efficiency of the ground film, thereby enhancing the thermal insulation performance of the ground film.

[0010] Preferably, the modified paraffin wax comprises the following raw materials: 3-7 g of sliced ​​paraffin wax, 0.35-0.41 g of polyurethane copolymer, 0.2-0.6 g of hexadecyltrimethylammonium bromide, 0.15-0.25 ml of ammonia solution, and 4-6 g of tetraethyl titanate.

[0011] Preferably, the preparation method of the modified paraffin wax is as follows: 3-7g of sliced ​​paraffin wax, 0.35-0.41g of polyurethane copolymer and 0.2-0.6g of hexadecyltrimethylammonium bromide are weighed, an ethanol aqueous solution is added for melting and stirring, and then 0.15-0.25ml of ammonia aqueous solution is added for homogenization, followed by continued heating and stirring, and then 4-6g of tetraethyl titanate is added dropwise, and the reaction is continued by stirring for 5.5-6.5h, and then aged, washed and dried.

[0012] Since sliced ​​paraffin wax has a suitable phase change temperature and a high phase change latent heat, it can absorb or release heat when the ambient temperature changes. It is the basis for the ground film to achieve the insulation function and maintain the stable soil temperature. Polyurethane copolymer is beneficial to improving the interfacial bonding strength between sliced ​​paraffin wax and titanium dioxide, and is conducive to forming a more complete coating structure, making the sliced ​​paraffin wax less likely to leak.

[0013] Preferably, the composite phase change material comprises the following raw materials: 8-12 ml silver nitrate, 5-9 ml sodium hydroxide solution, 2-5 ml ammonia solution, 0.5-1.5 g expanded graphite, 5-10 ml glucose solution, and 8-12 g modified paraffin.

[0014] Preferably, the preparation method of the composite phase change material is as follows: 8-12 ml of silver nitrate is added dropwise to 5-9 ml of sodium hydroxide solution, followed by dropwise addition of 2-5 ml of ammonia solution, 0.5-1.5 g of expanded graphite and 5-10 ml of glucose solution are added, heated with stirring, and vacuum dried to obtain silver-coated expanded graphite, 8-12 g of modified paraffin is melted, and the silver-coated expanded graphite is added to the melted modified paraffin, stirred, and vacuum impregnated.

[0015] Since expanded graphite has a porous and loose flaky structure, as the core carrier of the composite phase change material, its rigid structure can disperse the stress of the ground film when it is subjected to external forces. At the same time, the interfacial bonding force between expanded graphite and substrates such as polyethylene and cationic starch is strong, which can enhance the mechanical properties of the ground film through the skeleton effect. Silver nitrate, sodium hydroxide, ammonia solution and glucose solution work together to form a uniform silver layer on the surface of the expanded graphite. The close combination of the silver layer and the expanded graphite enhances the stability of the carrier structure, making the composite phase change material more evenly dispersed in the ground film, reducing stress concentration caused by local aggregation, and further improving the overall mechanical properties.

[0016] Silver has extremely high thermal conductivity and can quickly transfer heat from the environment, accelerating the heat storage and release response of the modified paraffin wax and improving the thermal insulation efficiency. The porous structure of expanded graphite provides ample carrying space for the modified paraffin wax, and its high adsorption capacity can stably fix the modified paraffin wax, making it less likely to leak when the temperature changes, thereby improving the long-term effectiveness of the heat storage function.

[0017] Preferably, the light stabilizer is one or a combination of HS-362FD, BW-10 G (622), HS-625 FD, HS-944 FD, and HS-962FD.

[0018] By adding light stabilizers, the damage of ultraviolet rays to polyethylene molecular chains can be reduced, photo-oxidation reactions such as polymer chain breakage and cross-linking can be reduced, and the embrittlement and cracking caused by aging of the ground film can be delayed, thereby improving its mechanical properties. At the same time, it is also less likely to cause thermal insulation performance degradation due to material leakage or structural damage.

[0019] Preferably, the antioxidant is one or a combination of antioxidant 1010 and antioxidant 168.

[0020] Since antioxidants can capture the free radicals generated by polyethylene during the oxidation process, they can effectively reduce the thermal oxidative degradation of polyethylene in high temperature and humid heat environments, thereby reducing the breakage of polymer chains and maintaining the structural integrity of the substrate, so that the mechanical properties of the ground film will not decline rapidly during long-term use. At the same time, by delaying the oxidative aging of polyethylene, the ground film is not prone to pores or cracks due to structural damage, making it less likely that the composite phase change material will leak or disperse unevenly, thereby maintaining the high thermal insulation performance of the ground film.

[0021] In a second aspect, the present application provides a method for preparing a high-strength, recyclable, and highly thermally insulating ground film, using the following technical solutions: A method for preparing a high-strength, recyclable, and high-insulation ground film comprises the following steps: S1: Place 65-75 parts of polyethylene, 5-10 parts of cationic starch solution, 15-20 parts of composite phase change material, 0.3-0.7 parts of antioxidant, and 0.5-1.1 parts of light stabilizer in a tablet press, mix at 175-185°C for 8-12 minutes, then vulcanize at 195-205°C and 10-20 MPa pressure for 4-8 minutes, and cold press for 3-5 minutes.

[0022] In summary, this application has the following beneficial effects: 1. Since polar groups such as hydroxyl groups in cationic starch molecules can form hydrogen bonds with the surface of polyethylene and composite phase change materials, it is beneficial to improve the compatibility between components and reduce interface defects. At the same time, the film-forming and adhesive properties of starch enhance the binding force between raw materials, making the film structure denser and the stress distribution more uniform when subjected to force, which is beneficial to improving the overall mechanical properties.

[0023] The silver-plated expanded graphite in the composite phase change material has a porous structure, which bears part of the external force through the skeleton effect, disperses the stress concentration points, and further improves the overall mechanical properties of the ground film. At the same time, the modified paraffin in the composite phase change material is the core heat storage component. Its phase change characteristics can absorb heat when the ambient temperature rises and release heat when the temperature drops, forming a temperature buffer, reducing soil temperature fluctuations, and is conducive to achieving high thermal insulation performance. In the silver-plated expanded graphite, the silver layer has excellent thermal conductivity and can quickly transfer heat, accelerating the heat storage and heat release of the modified paraffin. The porous structure of the expanded graphite provides a stable carrier for the modified paraffin, which is conducive to the long-term effectiveness of the modified paraffin heat storage function.

[0024] 2. Due to the stability of titanium dioxide, after wrapping titanium dioxide on the surface of sliced ​​paraffin, it can perform a protective film, thereby reducing the leakage of sliced ​​paraffin in a high temperature environment, thereby improving the morphological stability and high thermal insulation of the sliced ​​paraffin. At the same time, titanium dioxide has good light reflection and ultraviolet shielding functions, which is beneficial to improving the light-heat conversion efficiency of the ground film, thereby enhancing the thermal insulation performance of the ground film.

[0025] 3. Since sliced ​​paraffin wax has a suitable phase change temperature and a high phase change latent heat, it can absorb or release heat when the ambient temperature changes. It is the basis for the ground film to achieve the insulation function and maintain the stability of the soil temperature. Polyurethane copolymer is beneficial to improving the interfacial bonding strength between sliced ​​paraffin wax and titanium dioxide, and is conducive to forming a more complete coating structure, making the sliced ​​paraffin wax less likely to leak. DETAILED DESCRIPTION

[0026] The present application is further described in detail below in conjunction with Examples 1 to 10 and Comparative Examples 1 and 2.

[0027] raw material Isophorone diisocyanate CAS: 4098-71-9; Dibutyltin dilaurate CAS: 77-58-7; 2,2-Dihydroxymethylpropionic acid CAS: 4767-03-7; N,N-Dimethylformamide (Shanghai Aladdin Biochemical Technology Co., Ltd.); Polyethylene glycol CAS: 25322-68-3; Paraffin wax (Sinopharm Chemical Reagent Co., Ltd.); Cetyltrimethylammonium bromide CAS: 57-09-0; Ethanol CAS: 64-17-5; Deionized water CAS: 7732-18-5; Ammonia Water (CAS: 1336-21-6); Tetraethyl titanate (CAS: 3087-36-3); Petroleum ether (Tianjin Damao Chemical Reagent Factory); Silver nitrate (CAS: 7761-88-8); Sodium hydroxide (Shanghai MacLean Biochemical Technology Co., Ltd.); Expanded graphite (Qingdao Tengshengda Carbon Machinery Co., Ltd.); Glucose (Sinopharm Chemical Reagent Co., Ltd.); Polyethylene (CAS: 9002-88-4); Cationic starch (Dongguan Dongmei Food Co., Ltd.); Light stabilizer (Lanzhou Jintudi Plastic Products Co., Ltd.); Antioxidant (Beijing Tiangang Auxiliary Co., Ltd.).

[0028] Example 1 A high-strength, recyclable, and high-heat-insulating ground film comprises the following raw materials in parts by weight: 70g of polyethylene, 7.5g of a cationic starch solution, 17.5g of a composite phase change material, 0.5g of an antioxidant, and 0.8g of a light stabilizer.

[0029] Specifically, a method for preparing a high-strength, recyclable, and high-insulation ground film comprises the following steps: S1: Weigh 44.5 g of isophorone diisocyanate and heat it to 80°C. Then, add 0.1 g of dibutyltin dilaurate, slowly dropwise add a mixed solution of 2,2-dihydroxymethylpropionic acid dissolved in N,N-dimethylformamide, and continue the reaction for 2 h. Then, add the mixture to polyethylene glycol at 80°C and continue the reaction for 2 h. Vacuum the mixture to remove the unreacted solvent to obtain a polyurethane copolymer. S2: Weigh 5 g of sliced ​​paraffin wax, 0.38 g of polyurethane copolymer, and 0.4 g of hexadecyltrimethylammonium bromide, add ethanol aqueous solution (water-to-alcohol ratio of 4:1), and melt and stir in an oil bath at 70°C for 1 h. Then, add 0.2 ml of ammonia aqueous solution and homogenize at 13,000 rpm for 5 min. Then, continue heating and stirring in an oil bath for 4 h, add 5 g of tetraethyl titanate dropwise, continue stirring and reacting for 6 h, then age for 12 h, wash alternately with deionized water, ethanol, and petroleum ether three times, and then dry in a 60°C oven for 24 h to obtain modified paraffin wax; S3: Take 10 ml of silver nitrate, add 7 ml of sodium hydroxide solution dropwise, then add 3.5 ml of ammonia solution, add 1 g of expanded graphite and 7.5 ml of glucose solution, stir and react at 65 ° C for 1 hour, then vacuum dry at 80 ° C for 2 hours to obtain silver-plated expanded graphite, take 10 g of modified paraffin and melt it, add the silver-plated expanded graphite to the melted modified paraffin and stir and react for 30 minutes, then vacuum impregnate at 85 ° C for 2 hours to obtain a composite phase change material; S4: 70 g of polyethylene, 7.5 g of 2% cationic starch solution, 17.5 g of composite phase change material, 0.5 g of antioxidant, and 0.8 g of light stabilizer were placed in a tablet press, mixed at 180°C for 10 min, then vulcanized at 200°C and 15 MPa pressure for 6 min, and cold pressed for 4 min to obtain a ground film; Among them, the light stabilizer is a combination of HS-625 FD and HS-944 FD; The antioxidant is a combination of antioxidant 1010 and antioxidant 168.

[0030] Example 2-Example 3 The difference from Example 1 is that the addition amounts of the various components of the high-strength, recyclable, and high-insulation ground film are different, as shown in Table 1.

[0031] Table 1 Addition amount of each component of high-strength recyclable high-insulation ground film in Examples 1 to 3 (g)

[0032] Example 4-Example 5 The difference from Example 1 is that the addition amounts of the components of the composite phase change material are different, as shown in Table 2.

[0033] Table 2 Addition amount of each component of the composite phase change material in Example 1 and Example 4-Example 5

[0034] Example 6 The difference from Example 1 is that the modified paraffin wax is replaced with an equal amount of slice paraffin wax.

[0035] Example 7-Example 8 The difference from Example 1 is that the addition amount of each component of the modified paraffin wax is different, as shown in Table 3.

[0036] Table 3 Addition amount of each component of modified paraffin wax in Example 1 and Example 7-Example 8

[0037] Example 9 The difference from Example 1 is that the light stabilizer is a combination of HS-362FD and BW-10 G (622).

[0038] Example 10 The difference from Example 1 is that the antioxidant is antioxidant 1010.

[0039] Comparative Example 1 The difference from Example 1 is that no composite phase change material is added.

[0040] Comparative Example 2 The difference from Example 1 is that no cationic starch solution is added.

[0041] Performance testing 1. Mechanical properties Three samples were taken from Examples 1 to 10 and Comparative Examples 1 to 2, respectively, and the mechanical properties of the samples were tested according to the standard GB / T4455 "Polyethylene Blown Shed Film for Agriculture"; The test data is shown in Table 4.

[0042] Table 4 Mechanical properties test results of Examples 1 to 10 and Comparative Examples 1 to 2

[0043] 2. Thermal insulation performance Three samples were taken from each of Examples 1 to 10 and Comparative Examples 1 to 2, respectively, and covered on the same soil surface. The soil was cooled at a rate of 5°C / h for 3 hours at a room temperature of 25°C, and the temperature difference before and after 3 hours was measured. The test data is shown in Table 5.

[0044] Table 5 Thermal insulation performance test results of Examples 1 to 10 and Comparative Examples 1 to 2

[0045] Combining Example 1 and Comparative Example 1 and Tables 4-5, it can be seen that compared with Example 1, the tensile strength of Comparative Example 1 is greatly reduced. At the same time, the temperature difference data of Comparative Example 1 is also greatly increased. This shows that compared with not adding composite phase change materials, adding composite phase change materials can effectively improve the mechanical properties and thermal insulation properties of the ground film.

[0046] The reason is that the silver-plated expanded graphite in the composite phase change material has a porous structure, which bears part of the external force through the skeleton effect, disperses the stress concentration points, and further improves the overall mechanical properties of the ground film. At the same time, the modified paraffin in the composite phase change material is the core heat storage component. Its phase change characteristics can absorb heat when the ambient temperature rises and release heat when the temperature drops, forming a temperature buffer, reducing soil temperature fluctuations, and is conducive to achieving high thermal insulation performance. In the silver-plated expanded graphite, the silver layer has excellent thermal conductivity and can quickly transfer heat, accelerating the heat storage and release of the modified paraffin. The porous structure of the expanded graphite provides a stable carrier for the modified paraffin, which is conducive to the long-term effectiveness of the modified paraffin heat storage function.

[0047] From Example 1 and Comparative Example 2 and Tables 4 and 5, it can be seen that the tensile strength of Comparative Example 2 is significantly reduced compared with Example 1. At the same time, the temperature difference data of Comparative Example 2 is also increased. This shows that, compared with not adding cationic starch solution, adding cationic starch solution can effectively improve the mechanical properties of the mulch film and affect the thermal insulation performance of the mulch film to a certain extent.

[0048] The reason is that polar groups such as hydroxyl groups in cationic starch molecules can form hydrogen bonds with the surface of polyethylene and composite phase change materials, which is beneficial to improving the compatibility between components and reducing interface defects. At the same time, the film-forming and adhesive properties of starch enhance the bonding force between raw materials, making the film structure denser and the stress distribution more uniform when subjected to force, which is beneficial to improving the overall mechanical properties.

[0049] Combining Example 1 and Example 2-Example 3 and Table 4-Table 5, it can be seen that compared with Example 1, the tensile strength of Example 2 and Example 3 is reduced. At the same time, the temperature difference data of Example 2 and Example 3 is also increased. This shows that the addition amount of each component of the high-strength, recyclable and high-insulation ground film affects the mechanical properties and thermal insulation properties of the ground film, and the addition amount of each component of the high-strength, recyclable and high-insulation ground film in Example 1 is optimal.

[0050] Combining Example 1 and Example 4-Example 5 and Table 4-Table 5, it can be seen that compared with Example 1, the tensile strength of Example 4 and Example 5 is reduced. At the same time, the temperature difference data of Example 4 and Example 5 is also increased. This shows that the addition amount of each component of the composite phase change material affects the mechanical properties and thermal insulation properties of the ground film, and the addition amount of each component of the composite phase change material in Example 1 is optimal.

[0051] Combining Example 1 and Example 6 and Tables 4-5, it can be seen that compared with Example 1, the tensile strength of Example 6 is greatly reduced. At the same time, the temperature difference data of Example 6 is also significantly increased. This shows that compared with adding conventional sliced ​​paraffin wax, adding modified paraffin wax can effectively improve the mechanical properties and thermal insulation properties of the ground film.

[0052] The reason is that due to the stability of titanium dioxide, after wrapping titanium dioxide on the surface of sliced ​​paraffin, it can perform a protective film, thereby reducing the leakage of sliced ​​paraffin in a high temperature environment, thereby improving the morphological stability and high thermal insulation of the sliced ​​paraffin. At the same time, titanium dioxide has good light reflection and ultraviolet shielding functions, which is beneficial to improving the light-heat conversion efficiency of the ground film, thereby enhancing the thermal insulation performance of the ground film.

[0053] Combining Example 1 and Example 7-Example 8 and Table 4-Table 5, it can be seen that compared with Example 1, the tensile strength of Example 7 and Example 8 is reduced. At the same time, the temperature difference data of Example 7 and Example 8 is also increased. This shows that the addition amount of each component of the modified paraffin wax affects the mechanical properties and thermal insulation properties of the ground film, and the addition amount of each component of the modified paraffin wax in Example 1 is optimal.

[0054] Combining Example 1 and Example 9 with Tables 4 and 5, it can be seen that the tensile strength of Example 9 is reduced compared to Example 1. At the same time, the temperature difference data of Example 9 is also increased. This shows that the selection of light stabilizer affects the mechanical properties and thermal insulation properties of the ground film, and the selection of the light stabilizer in Example 1 is the optimal solution.

[0055] Combining Example 1 and Example 10 and Tables 4 and 5, it can be seen that the tensile strength of Example 10 is reduced compared with Example 1. At the same time, the temperature difference data of Example 10 is also increased. This shows that the selection of antioxidant affects the mechanical properties and thermal insulation properties of the ground film, and the selection of the antioxidant in Example 1 is the optimal solution.

[0056] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A high-strength, recyclable, and high-insulation ground film, characterized in that: The invention comprises the following raw materials in parts by weight: 65-75 parts of polyethylene, 5-10 parts of cationic starch solution, 15-20 parts of composite phase change material, 0.3-0.7 parts of antioxidant, and 0.5-1.1 parts of light stabilizer; Wherein, the composite phase change material is a silver-plated expanded graphite / modified paraffin composite phase change material.

2. The high-strength, recyclable, and high-insulation ground film according to claim 1, characterized in that: The modified paraffin wax is titanium dioxide wrapped slice paraffin wax.

3. The high-strength, recyclable, and high-insulation ground film according to claim 2, characterized in that: The modified paraffin wax comprises the following raw materials: 3-7g sliced ​​paraffin, 0.35-0.41g polyurethane copolymer, 0.2-0.6g hexadecyltrimethylammonium bromide, 0.15-0.25ml ammonia solution, 4-6g tetraethyl titanate.

4. The high-strength, recyclable, and high-insulation ground film according to claim 3, characterized in that: The modified paraffin wax preparation method comprises weighing 3-7 g of sliced ​​paraffin wax, 0.35-0.41 g of polyurethane copolymer, and 0.2-0.6 g of hexadecyltrimethylammonium bromide, adding an ethanol aqueous solution for melting and stirring, then adding 0.15-0.25 ml of an ammonia aqueous solution for homogenization, then continuing heating and stirring, then adding 4-6 g of tetraethyl titanate dropwise, continuing stirring and reacting for 5.5-6.5 hours, and then aging, washing, and drying.

5. The high-strength, recyclable, and high-insulation ground film according to claim 1, characterized in that: The composite phase change material includes the following raw materials: 8-12 ml of silver nitrate, 5-9 ml of sodium hydroxide solution, 2-5 ml of ammonia solution, 0.5-1.5 g of expanded graphite, 5-10 ml of glucose solution, and 8-12 g of modified paraffin.

6. The high-strength, recyclable, and high-insulation ground film according to claim 5, characterized in that: The preparation method of the composite phase change material comprises the following steps: taking 8-12 ml of silver nitrate, adding 5-9 ml of sodium hydroxide solution dropwise, then adding 2-5 ml of ammonia solution dropwise, adding 0.5-1.5 g of expanded graphite and 5-10 ml of glucose solution, heating and stirring, and vacuum drying to obtain silver-plated expanded graphite, taking 8-12 g of modified paraffin wax for melting, adding the silver-plated expanded graphite to the melted modified paraffin wax, stirring, and vacuum impregnation.

7. The high-strength, recyclable, and high-insulation ground film according to claim 1, characterized in that: The light stabilizer is one or a combination of HS-362FD, BW-10 G (622), HS-625 FD, HS-944 FD, and HS-962FD.

8. The high-strength, recyclable, and high-insulation ground film according to claim 1, characterized in that: The antioxidant is one or a combination of antioxidant 1010 and antioxidant 168.

9. The method for preparing a high-strength, recyclable, and high-insulation ground film according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: Place 65-75 parts of polyethylene, 5-10 parts of cationic starch solution, 15-20 parts of composite phase change material, 0.3-0.7 parts of antioxidant and 0.5-1.1 parts of light stabilizer in a tablet press, mix at 175-185°C for 8-12 minutes, then vulcanize at 195-205°C and 10-20 MPa pressure for 4-8 minutes, and cold press for 3-5 minutes.

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