High-strength recyclable high-thermal-insulation mulching film and preparation method thereof

Abstract

The application relates to the technical field of mulch film preparation, and particularly discloses a high-strength recyclable high-heat-retention mulch film and a preparation method thereof. The high-strength recyclable high-heat-retention mulch film 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 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. The high-strength recyclable high-heat-retention mulch film has the advantages that the mechanical properties and heat-retention performance of the mulch film can be improved, and the defects that the mechanical properties and heat-retention performance of the mulch film are still insufficient are eliminated.

Description

Technical Field

[0001] This application relates to the field of mulch film preparation technology, and more specifically, it relates to a high-strength, recyclable, and heat-insulating mulch film and its preparation method. Background Technology

[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 ground, mulch film can effectively increase soil temperature, reduce water evaporation, and inhibit weed growth, thereby significantly improving the rhizosphere environment of crops and thus increasing crop yield and quality.

[0003] Polyethylene mulch film is the most common type of mulch film. Currently, my country has become the country that uses the most polyethylene mulch film in the world. However, under harsh environmental conditions such as strong ultraviolet radiation, high temperature and humidity, the long chain structure of polyethylene mulch film is prone to photo-oxidation 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 film to degrade rapidly. Summary of the Invention

[0004] In order to improve the shortcomings of the mechanical and heat-insulating properties of mulch film, this application provides a high-strength recyclable high-heat-insulating mulch film and its preparation method.

[0005] Firstly, this application provides a high-strength, recyclable, and heat-insulating mulch film, which adopts the following technical solution:

[0006] A high-strength, recyclable, and heat-insulating mulch film comprises the following raw materials in parts by weight: 65-75 parts polyethylene, 5-10 parts cationic starch solution, 15-20 parts composite phase change material, 0.3-0.7 parts antioxidant, and 0.5-1.1 parts light stabilizer;

[0007] The composite phase change material is a silver-plated expanded graphite / modified paraffin composite phase change material.

[0008] Because the 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 mulch film structure denser and the stress distribution more uniform under stress, thus improving the overall mechanical properties.

[0009] The silver-plated expanded graphite in the composite phase change material has a porous structure, which can bear part of the external force through the skeleton effect, disperse stress concentration points, and further improve the overall mechanical properties of the mulch 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 helping to achieve high heat preservation performance. In addition, the silver layer in the silver-plated expanded graphite has excellent thermal conductivity, which can quickly transfer heat and accelerate the heat storage and heat release response 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 heat storage function of the modified paraffin.

[0010] Preferably, the modified paraffin is titanium dioxide-coated sliced ​​paraffin.

[0011] Due to the stability of titanium dioxide, coating the surface of sliced ​​paraffin with titanium dioxide can form a protective film, thereby reducing leakage of the sliced ​​paraffin in high-temperature environments, thus improving the morphological stability and high heat retention of the sliced ​​paraffin. At the same time, titanium dioxide has good light reflection and ultraviolet shielding functions, which is conducive to improving the photothermal conversion efficiency of the mulch film, thereby enhancing the heat retention performance of the mulch film.

[0012] Preferably, the modified paraffin comprises the following raw materials: 3-7g sliced ​​paraffin, 0.35-0.41g polyurethane copolymer, 0.2-0.6g cetyltrimethylammonium bromide, 0.15-0.25ml ammonia solution, and 4-6g tetraethyl titanate.

[0013] Preferably, the modified paraffin is prepared by: weighing 3-7g of sliced ​​paraffin, 0.35-0.41g of polyurethane copolymer and 0.2-0.6g of cetyltrimethylammonium bromide, adding an aqueous ethanol solution for melting and stirring, then adding 0.15-0.25ml of an aqueous ammonia solution for homogenization, then continuing to heat and stir, then adding 4-6g of tetraethyl titanate dropwise, continuing to stir and react for 5.5-6.5h, followed by aging, washing and drying.

[0014] Because of its suitable phase change temperature and high latent heat of phase change, the slab paraffin can absorb or release heat when the ambient temperature changes. This is the basis for the thermal insulation function of the mulch film and to maintain the stability of the soil temperature. The polyurethane copolymer is beneficial to improving the interfacial bonding force between the slab paraffin and titanium dioxide, and is conducive to forming a more complete coating structure, making the slab paraffin less prone to leakage.

[0015] 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.

[0016] Preferably, the preparation method of the composite phase change material is as follows: take 8-12 ml of silver nitrate, add 5-9 ml of sodium hydroxide solution dropwise, then add 2-5 ml of ammonia solution, add 0.5-1.5 g of expanded graphite and 5-10 ml of glucose solution, heat and stir, and vacuum dry to obtain silver-plated expanded graphite. Take 8-12 g of modified paraffin wax and melt it. Add the silver-plated expanded graphite to the melted modified paraffin wax and stir and vacuum impregnate.

[0017] Because expanded graphite has a porous and loose sheet-like structure, as the core carrier of composite phase change materials, its rigid structure can disperse the stress of the mulch film when subjected to external forces. At the same time, expanded graphite has a strong interfacial bonding force with substrates such as polyethylene and cationic starch, which can enhance the mechanical properties of the mulch film through the skeleton effect. The combined action of silver nitrate, sodium hydroxide, ammonia solution and glucose solution forms a uniform silver layer on the surface of expanded graphite. The tight bonding between the silver layer and expanded graphite enhances the stability of the carrier structure, making the composite phase change material more uniformly dispersed in the mulch film, reducing stress concentration caused by local aggregation, and further improving the overall mechanical properties.

[0018] Silver has extremely high thermal conductivity, which can quickly transfer heat from the environment, accelerate the heat storage and heat release response of modified paraffin, and improve the heat preservation efficiency. The porous structure of expanded graphite provides ample space for modified paraffin to be supported, and its high adsorption can stably fix the modified paraffin, making it less prone to leakage when the temperature changes, thereby improving the long-term effectiveness of the heat storage function.

[0019] Preferably, the light stabilizer is one or a combination of several of HS-362FD, BW-10 G(622), HS-625 FD, HS-944 FD, and HS-962FD.

[0020] By adding light stabilizers, the damage of ultraviolet rays to the polyethylene molecular chain is reduced, thus reducing photo-oxidation reactions such as polymer chain breakage and cross-linking. This delays the embrittlement and cracking of the mulch film caused by aging, thereby improving its mechanical properties. At the same time, it also makes it less likely for the thermal insulation performance to decline due to material leakage or structural damage.

[0021] Preferably, the antioxidant is one or a combination of antioxidant 1010 and antioxidant 168.

[0022] Because antioxidants can capture free radicals generated during the oxidation of polyethylene, they can effectively reduce the thermal oxidative degradation of polyethylene in high-temperature and humid environments, thereby reducing polymer chain breakage and maintaining the structural integrity of the substrate. This prevents the mechanical properties of the mulch film from declining rapidly during long-term use. At the same time, by delaying the oxidative aging of polyethylene, the mulch film is less prone to pores or cracks due to structural damage, thus making it less likely for the composite phase change material to leak or disperse unevenly, maintaining the high thermal insulation performance of the mulch film.

[0023] Secondly, this application provides a method for preparing a high-strength, recyclable, and heat-insulating mulch film, employing the following technical solution:

[0024] A method for preparing a high-strength, recyclable, and heat-insulating mulch film includes the following steps:

[0025] S1: Place 65-75 parts polyethylene, 5-10 parts cationic starch solution, 15-20 parts composite phase change material, 0.3-0.7 parts antioxidant, and 0.5-1.1 parts light stabilizer in a tablet press and mix at 175-185℃ for 8-12 minutes. Then vulcanize at 195-205℃ and 10-20MPa pressure for 4-8 minutes and cold press for 3-5 minutes.

[0026] In summary, this application has the following beneficial effects:

[0027] 1. Because the 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 mulch film structure denser and the stress distribution more uniform under stress, thus improving the overall mechanical properties.

[0028] The silver-plated expanded graphite in the composite phase change material has a porous structure, which can bear part of the external force through the skeleton effect, disperse stress concentration points, and further improve the overall mechanical properties of the mulch 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 helping to achieve high heat preservation performance. In addition, the silver layer in the silver-plated expanded graphite has excellent thermal conductivity, which can quickly transfer heat and accelerate the heat storage and heat release response 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 heat storage function of the modified paraffin.

[0029] 2. Due to the stability of titanium dioxide, coating the surface of the sliced ​​paraffin with titanium dioxide can form a protective film, thereby reducing the leakage of the sliced ​​paraffin in high-temperature environments, thus improving the morphological stability and high heat retention of the sliced ​​paraffin. At the same time, titanium dioxide has good light reflection and ultraviolet shielding functions, which is conducive to improving the photothermal conversion efficiency of the mulch film, thereby enhancing the heat retention performance of the mulch film.

[0030] 3. Because sliced ​​paraffin wax has a suitable phase change temperature and a high latent heat of phase change, it can absorb or release heat when the ambient temperature changes. This is the basis for the thermal insulation function of the mulch film and maintains the stability of the soil temperature. The polyurethane copolymer is conducive to improving the interfacial bonding force between sliced ​​paraffin wax and titanium dioxide, and is conducive to forming a more complete coating structure, making the sliced ​​paraffin wax less prone to leakage. Detailed Implementation

[0031] The present application will be further described in detail below with reference to Examples 1-10 and Comparative Examples 1-2.

[0032] raw material

[0033] Isophorone diisocyanate CAS: 4098-71-9; Dibutyltin dilaurate CAS: 77-58-7; 2,2-Dimethylolpropionic acid CAS: 4767-03-7; N,N-Dimethylformamide Shanghai Aladdin Biochemical Technology Co., Ltd.; Polyethylene glycol CAS: 25322-68-3; Sliced ​​paraffin Sinopharm Chemical Reagent Co., Ltd.; Hexadecyltrimethylammonium 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 Additives Co., Ltd.

[0034] Example 1

[0035] A high-strength, recyclable, and heat-insulating mulch film comprises the following raw materials in parts by weight: 70g polyethylene, 7.5g cationic starch solution, 17.5g composite phase change material, 0.5g antioxidant, and 0.8g light stabilizer.

[0036] Specifically, a method for preparing a high-strength, recyclable, and heat-insulating mulch film includes the following steps:

[0037] S1: Weigh 44.5g of isophorone diisocyanate, heat to 80℃, then add 0.1g of dibutyltin dilaurate, slowly add a mixed solution of 2,2-dimethylolpropionic acid dissolved in N,N-dimethylformamide, and continue the reaction for 2h. Then add it to polyethylene glycol at 80℃ and continue the reaction for 2h. Remove the unreacted solvent by vacuum to obtain polyurethane copolymer;

[0038] S2: Weigh 5g of sliced ​​paraffin, 0.38g of polyurethane copolymer and 0.4g of cetyltrimethylammonium bromide, add an ethanol-water solution (water-to-ethanol ratio of 4:1), melt and stir in an oil bath at 70℃ for 1h, then add 0.2ml of ammonia solution and homogenize at 13000rpm for 5min, then continue heating and stirring in an oil bath for 4h, then add 5g of tetraethyl titanate dropwise, continue stirring and reacting for 6h, then age for 12h, wash three times alternately with deionized water, ethanol and petroleum ether, then dry in an oven at 60℃ for 24h to obtain modified paraffin;

[0039] 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 h, then vacuum dry at 80°C for 2 h to obtain silver-plated expanded graphite. Take 10 g of modified paraffin wax and melt it. Add the silver-plated expanded graphite to the melted modified paraffin wax and stir and react for 30 min. Then vacuum impregnate at 85°C for 2 h to obtain composite phase change material.

[0040] S4: Place 70g polyethylene, 7.5g 2% cationic starch solution, 17.5g composite phase change material, 0.5g antioxidant and 0.8g light stabilizer in a tablet press, mix at 180℃ for 10min, then vulcanize at 200℃ and 15MPa pressure for 6min, and cold press for 4min to obtain mulch film.

[0041] The light stabilizer is a combination of HS-625 FD and HS-944 FD;

[0042] The antioxidant is a combination of antioxidant 1010 and antioxidant 168.

[0043] Example 2-Example 3

[0044] The difference from Example 1 is that the amount of each component added to the high-strength recyclable high-insulation mulch film is different, as shown in Table 1.

[0045] Table 1. Amounts (g) of each component added to the high-strength recyclable high-insulation mulch film in Examples 1-3

[0046]

[0047] Example 4-Example 5

[0048] The difference from Example 1 is that the amount of each component added to the composite phase change material is different, as shown in Table 2.

[0049] Table 2. Amounts of each component added to the composite phase change material in Examples 1 and 4-5.

[0050]

[0051] Example 6

[0052] The difference from Example 1 is that the modified paraffin is replaced with an equal amount of sliced ​​paraffin.

[0053] Examples 7-8

[0054] The difference from Example 1 is that the amount of each component added in the modified paraffin is different, as shown in Table 3.

[0055] Table 3. Amounts of each component added to the modified paraffin in Examples 1 and 7-8.

[0056]

[0057] Example 9

[0058] The difference from Example 1 is that the light stabilizer is a combination of HS-362FD and BW-10 G(622).

[0059] Example 10

[0060] The difference from Example 1 is that the antioxidant is antioxidant 1010.

[0061] Comparative Example 1

[0062] The difference from Example 1 is that no composite phase change material is added.

[0063] Comparative Example 2

[0064] The difference from Example 1 is that cationic starch solution is no longer added.

[0065] Performance testing

[0066] I. Mechanical Properties

[0067] Three samples were taken from Examples 1-10 and Comparative Examples 1-2 respectively, and the mechanical properties of the samples were tested in accordance with GB / T4455 "Agricultural Polyethylene Blown Greenhouse Film" standard.

[0068] The test data is shown in Table 4.

[0069] Table 4. Mechanical property test results of Examples 1-10 and Comparative Examples 1-2

[0070]

[0071] II. Thermal Insulation Performance

[0072] Three samples were taken from Examples 1-10 and Comparative Examples 1-2, respectively, and covered on the same soil surface. The samples were cooled at 5°C / h for 3 hours at a room temperature of 25°C, and the temperature difference before and after 3 hours was measured.

[0073] The test data is shown in Table 5.

[0074] Table 5. Test results of thermal insulation performance of Examples 1-10 and Comparative Examples 1-2

[0075]

[0076] Combining Example 1 and Comparative Example 1 with Tables 4-5, it can be seen that, compared with Example 1, the tensile strength of Comparative Example 1 is significantly reduced, while the temperature difference data of Comparative Example 1 is significantly increased. This shows that, compared with not adding composite phase change material, adding composite phase change material can effectively improve the mechanical properties and thermal insulation properties of the mulch film.

[0077] The reason for this is that the silver-plated expanded graphite in the composite phase change material has a porous structure, which can bear part of the external force through the skeleton effect, disperse stress concentration points, and further improve the overall mechanical properties of the mulch 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 helping to achieve high heat preservation performance. In addition, the silver layer in the silver-plated expanded graphite has excellent thermal conductivity, which can quickly transfer heat and accelerate the heat storage and heat release response 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 heat storage function of the modified paraffin.

[0078] Based on Example 1 and Comparative Example 2, and referring to Tables 4-5, it can be seen that the tensile strength of Comparative Example 2 is significantly reduced compared to Example 1. At the same time, the temperature difference data of Comparative Example 2 is also increased. This indicates that, compared to not adding cationic starch solution, adding cationic starch solution can effectively improve the mechanical properties of the mulch film and affect its heat preservation performance to a certain extent.

[0079] The reason for this is that the 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 helps 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 mulch film structure denser and the stress distribution more uniform when under stress, thus helping to improve the overall mechanical properties.

[0080] Based on Examples 1 and 2-3, and in conjunction with Tables 4-5, it can be seen that the tensile strength of Examples 2 and 3 is lower than that of Example 1. At the same time, the temperature difference data of Examples 2 and 3 is also higher. This indicates that the amount of each component added to the high-strength recyclable high-insulation mulch film affects the mechanical and thermal insulation properties of the mulch film, and the amount of each component added to the high-strength recyclable high-insulation mulch film in Example 1 is optimal.

[0081] Based on Examples 1 and 4-5 and Tables 4-5, it can be seen that the tensile strength of Examples 4 and 5 is lower than that of Example 1. At the same time, the temperature difference data of Examples 4 and 5 is also increased. This indicates that the amount of each component added to the composite phase change material affects the mechanical properties and thermal insulation properties of the mulch film, and the amount of each component added to the composite phase change material in Example 1 is optimal.

[0082] Combining Examples 1 and 6 with Tables 4 and 5, it can be seen that the tensile strength of Example 6 is significantly reduced compared to Example 1. At the same time, the temperature difference data of Example 6 is also significantly increased. This shows that, compared with adding conventional sliced ​​paraffin, adding modified paraffin can effectively improve the mechanical properties and thermal insulation properties of the mulch film.

[0083] The reason for this is that, due to the stability of titanium dioxide, coating the surface of the sliced ​​paraffin with titanium dioxide can form a protective film, thereby reducing the leakage of the sliced ​​paraffin in high-temperature environments, thus improving the morphological stability and high heat retention of the sliced ​​paraffin. At the same time, titanium dioxide has good light reflection and ultraviolet shielding functions, which is conducive to improving the photothermal conversion efficiency of the mulch film, thereby enhancing the heat retention performance of the mulch film.

[0084] Based on Examples 1 and 7-8, and in conjunction with Tables 4-5, it can be seen that the tensile strength of Examples 7 and 8 is lower than that of Example 1. At the same time, the temperature difference data of Examples 7 and 8 is also higher. This indicates that the amount of each component added to the modified paraffin affects the mechanical and thermal insulation properties of the mulch film, and the amount of each component added to the modified paraffin in Example 1 is optimal.

[0085] Combining Examples 1 and 9 with Tables 4 and 5, it can be seen that the tensile strength of Example 9 is lower than that of Example 1, while the temperature difference data of Example 9 is also higher. This indicates that the selection of light stabilizer affects the mechanical and thermal insulation properties of the mulch film, and the selection of light stabilizer in Example 1 is the optimal solution.

[0086] Combining Examples 1 and 10 with Tables 4 and 5, it can be seen that the tensile strength of Example 10 is lower than that of Example 1, while the temperature difference data of Example 10 is also increased. This indicates that the selection of antioxidant affects the mechanical properties and thermal insulation properties of the mulch film, and the selection of antioxidant in Example 1 is the optimal solution.

[0087] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high-strength, recyclable, and heat-insulating mulch film, characterized in that, The raw materials include the following parts by weight: 65-75 parts polyethylene, 5-10 parts cationic starch solution, 15-20 parts composite phase change material, 0.3-0.7 parts antioxidant, and 0.5-1.1 parts light stabilizer; The composite phase change material is a silver-plated expanded graphite / modified paraffin composite phase change material. The modified paraffin is titanium dioxide-coated sliced ​​paraffin; The modified paraffin wax comprises the following raw materials: 3-7g sliced ​​paraffin wax, 0.35-0.41g polyurethane copolymer, 0.2-0.6g cetyltrimethylammonium bromide, 0.15-0.25ml ammonia solution, and 4-6g tetraethyl titanate; The modified paraffin is prepared as follows: Weigh 3-7g of sliced ​​paraffin, 0.35-0.41g of polyurethane copolymer and 0.2-0.6g of cetyltrimethylammonium bromide, add an aqueous ethanol solution for melting and stirring, then add 0.15-0.25ml of ammonia solution for homogenization, then continue heating and stirring, then add 4-6g of tetraethyl titanate dropwise, continue stirring and reacting for 5.5-6.5h, then age, wash and dry; 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. The preparation method of the composite phase change material is as follows: Take 8-12 ml of silver nitrate, add 5-9 ml of sodium hydroxide solution dropwise, then add 2-5 ml of ammonia solution, add 0.5-1.5 g of expanded graphite and 5-10 ml of glucose solution, heat and stir, and vacuum dry to obtain silver-plated expanded graphite. Take 8-12 g of modified paraffin wax and melt it. Add the silver-plated expanded graphite to the melted modified paraffin wax and stir and vacuum impregnate.

2. The high-strength, recyclable, and heat-insulating mulch film according to claim 1, characterized in that: The light stabilizer is one or a combination of several of HS-362FD, BW-10G, HS-625FD, HS-944FD, and HS-962FD.

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

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

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