Temperature-resistant anti-aging rubber plasticizer and preparation method thereof

Abstract

The invention relates to the field of rubber additives, in particular to a temperature-resistant anti-aging rubber plasticizer and a preparation method thereof. The temperature-resistant anti-aging rubber plasticizer at least comprises the following components in parts by mass: 30-50 parts of a main plasticizer and 15-25 parts of an auxiliary plasticizer. According to the temperature-resistant anti-aging rubber plasticizer and the preparation method thereof, the finally prepared plasticizer not only has an excellent plasticizing effect, but also has good comprehensive properties such as temperature resistance, aging resistance and moisture resistance, meets the comprehensive requirements of the existing rubber field on plasticizers, improves the use quality of rubber and prolongs the service life of the rubber.

Description

Technical Field

[0001] The present application relates to the field of rubber additives, and more specifically, a temperature-resistant and anti-aging rubber plasticizer and its preparation method are mentioned. Background Art

[0002] With the development of industry and the continuous improvement of requirements for material properties, rubber products are increasingly widely used in multiple fields such as automobiles, construction, and electronics. In order to meet the performance requirements of rubber products in these fields, especially their stability under different temperature conditions and anti-aging ability during long-term use, it has become particularly important to develop high-performance rubber plasticizers.

[0003] Currently, there are already various types of rubber plasticizers on the market, such as esters, benzenes, alcohols, etc. These plasticizers each have their own characteristics. For example, ester plasticizers are suitable for low-temperature environments due to their good transparency and cold resistance; benzene plasticizers are suitable for use in high-temperature or oil environments because of their excellent oil resistance and heat resistance. In addition, some new modified and polymer plasticizers are also constantly developing. They not only reduce the risk of environmental pollution but also improve the comprehensive performance of products.

[0004] For example, Patent CN109776900A proposes a highly stable rubber plasticizer obtained by poly-esterification reaction of raw materials such as monounsaturated fatty acids and glycerol esters, effectively improving the heat resistance, anti-aging and other properties of the plasticizer. Patent CN117777737A proposes a high-efficiency rubber plasticizer mainly prepared by combining modified chlorinated paraffin and modified epoxy soybean oil as raw materials, ultimately effectively improving the low-temperature resistance of the plasticizer, reducing internal migration and free phenomena, and improving the overall stability.

[0005] However, under the current requirements, there are still obvious performance problems with rubber plasticizers. For example, some plasticizers still lack in aspects such as high-temperature tolerance, aging resistance, and high-humidity resistance, with poor comprehensive performance, limited application in the existing technical field, and low service life. Summary of the Invention

[0006] Therefore, as described above, how to further make up for the performance problems of rubber plasticizers in aspects such as high-temperature tolerance, anti-aging, and moisture resistance has become an important research topic for those skilled in the art. The applicant proposes a temperature-resistant and anti-aging rubber plasticizer and its preparation method. The finally prepared plasticizer not only has excellent plasticizing effects but also good comprehensive properties such as temperature resistance, anti-aging, and moisture resistance, meeting the comprehensive requirements of the existing rubber field for plasticizers and improving the use quality and service life of rubber.

[0007] A temperature-resistant and anti-aging rubber plasticizer, calculated by mass, includes at least 30 - 50 parts of a main plasticizer and 15 - 25 parts of an auxiliary plasticizer.

[0008] Preferred embodiment, the main plasticizer is polypropylene adipate or polypropylene sebacate.

[0009] Preferred embodiment, the main plasticizer is polypropylene adipate.

[0010] Preferred embodiment, the weight-average molecular weight of the main plasticizer is 2000-4000 Da.

[0011] Preferred embodiment, the weight-average molecular weight of the main plasticizer is 2500-3500 Da.

[0012] Preferred embodiment, the co-plasticizer is a modified copolymer resin.

[0013] Preferred embodiment, the preparation method of the modified copolymer resin specifically includes the following steps: S1: adding the matrix resin to an organic solvent, heating and dissolving, then sequentially adding perfluorohexyl acrylate and diphenylphosphoryl ethyl methacrylate under nitrogen protection; S2: dropwise adding diisopropylbenzene peroxide and then maintaining the reaction at a constant temperature; S3: cooling, precipitating and filtering the reaction solution, washing the filtered product and drying it under vacuum to obtain the product.

[0014] Preferred embodiment, the preparation method of the modified copolymer resin specifically includes the following steps: S1: adding the matrix resin to an organic solvent, heating to 100-120 °C, stirring at 120-160 rpm, and sequentially adding perfluorohexyl acrylate and diphenylphosphoryl ethyl methacrylate under nitrogen protection; S2: dissolving diisopropylbenzene peroxide in an organic solvent, dropwise adding it, with the dropwise addition time being 1.5-2.5 h, and maintaining the temperature for 2-3 h after the dropwise addition is completed; S3: cooling the reaction solution of S2 to 55-60 °C, adding ethanol to precipitate and filter, finally washing the filtered product with acetone 2-3 times, and drying it under vacuum at 80-85 °C for 5-6 h to obtain the product.

[0015] Preferred embodiment, the matrix resin is a SEBS copolymer resin.

[0016] Preferred embodiment, the organic solvent is xylene.

[0017] Preferred embodiment, the mass ratio of the matrix resin, perfluorohexyl acrylate and diphenylphosphoryl ethyl methacrylate is (20-35):(5-10):(3-8).

[0018] Preferred embodiment, the mass ratio of the matrix resin, perfluorohexyl acrylate and diphenylphosphoryl ethyl methacrylate is (25-30):(6-8):(4-4.5).

[0019] After adding the above modified copolymer resin, due to the high electronegativity of fluorine atoms in the perfluorohexyl chain, a low surface energy is formed to inhibit the penetration of water molecules, and the energy is converted into heat energy and diffused through molecular vibration. In addition, diphenylphosphorylethyl methacrylate decomposes at high temperature to generate phosphate radicals, which promote the cross-linking of rubber into a carbon layer and assist in improving the anti-aging and moisture isolation effects. On the other hand, in the butyl acrylate unit of the EBA-St resin, α-hydrogen is extracted by the radicals generated by DCP to form macromolecular radicals, which further promote the chain growth reaction, thereby greatly optimizing the cross-linking strength and intermolecular interaction within the plasticizer system, enhancing the plasticizing effect while maintaining good comprehensive performance.

[0020] In a preferred embodiment, the mass ratio of the main plasticizer to the auxiliary plasticizer is (35 - 48):(18 - 23).

[0021] In a preferred embodiment, the mass ratio of the main plasticizer to the auxiliary plasticizer is (40 - 45):(19 - 21).

[0022] In a preferred embodiment, the temperature-resistant and anti-aging rubber plasticizer, in parts by mass, further includes: 5 - 8 parts of a reinforcing composition, 0.5 - 1 part of an antioxidant, 0.5 - 1 part of a mildew-proof agent, 2 - 4 parts of a flame retardant, 0.5 - 1 part of a leveling agent, and 3 - 6 parts of a tackifier.

[0023] In a preferred embodiment, the mass ratio of the main plasticizer to the reinforcing composition is (35 - 48):(6 - 7).

[0024] In a preferred embodiment, the reinforcing composition is a composition of aluminum diethylphosphinate, a phosphazene compound, and dodecyl succinic anhydride.

[0025] In a preferred embodiment, the mass ratio of aluminum diethylphosphinate, the phosphazene compound, and dodecyl succinic anhydride is (7 - 10):(4 - 8):(1 - 4).

[0026] In a preferred embodiment, the mass ratio of aluminum diethylphosphinate, the phosphazene compound, and dodecyl succinic anhydride is (8 - 9):(5 - 6):(1.2 - 2.2).

[0027] In a preferred embodiment, the phosphazene compound is hexaphenoxycyclotriphosphazene.

[0028] In a preferred embodiment, the antioxidant is at least one of antioxidant 168, antioxidant 245, antioxidant 1010, and antioxidant DLTDP.

[0029] In a preferred embodiment, the antioxidant is antioxidant 168 or antioxidant 245.

[0030] Preferred embodiment: The mildew-proof agent is isothiazolinone or zinc pyrithione.

[0031] Preferred embodiment: The mildew-proof agent is zinc pyrithione.

[0032] Preferred embodiment: The flame retardant is a composition of ammonium polyphosphate and zinc borate.

[0033] Preferred embodiment: The mass ratio of ammonium polyphosphate to zinc borate is (0.8 - 1.4):(3 - 4).

[0034] Preferred embodiment: The average particle size of zinc borate is 2 - 4 μm.

[0035] Preferred embodiment: The leveling agent is acrylate or organosiloxane.

[0036] Preferred embodiment: The leveling agent is organosiloxane.

[0037] Preferred embodiment: The tackifier is rosin glyceride or polybutadiene.

[0038] Preferred embodiment: The tackifier is rosin glyceride.

[0039] The preparation method of the above heat-resistant and anti-aging rubber plasticizer specifically includes the following steps: S1: Dehydrate and dry the main plasticizer in an oven at 75 - 80 °C for 2 - 2.5 h, with the moisture content ≤ 0.1%. Then add the main plasticizer and the auxiliary plasticizer to a kneader, set the temperature at 95 - 105 °C, the rotation speed at 40 - 60 rpm, and knead for 20 - 30 min to obtain a colloidal base material; S2: Add the reinforcing composition to the colloidal base material, knead at 110 - 120 °C and 60 - 80 rpm for 10 - 15 min; S3: Add the remaining raw materials, cool down to 85 - 95 °C, knead at 40 - 60 rpm for 10 - 15 min. After completion, transfer the colloidal base material to a vacuum degassing machine, set the vacuum degree at -0.09 - -0.08 MPa, and the degassing time at 10 - 15 min. Granulate through a twin-screw extruder, with the temperature range of 90 - 115 °C. After completion, seal to obtain the product.

[0040] Practical significance and effects:

[0041] 1. The plasticizer finally prepared in this application not only has excellent plasticizing effects, but also has good comprehensive properties such as heat resistance, aging resistance, and moisture resistance, meeting the comprehensive requirements of the existing rubber field for plasticizers, and improving the use quality and service life of rubber.

[0042] 2. In this application, a modified copolymer resin is added to the plasticizer composition. Not only does the high electronegativity of the fluorine atoms in the perfluorohexyl chain form a low surface energy to inhibit the penetration of water molecules, but also the energy is converted into heat energy and diffused through molecular vibration. In addition, diphenylphosphoryl ethyl methacrylate decomposes at high temperatures to generate phosphate radicals, which promote the crosslinking of rubber into a carbon layer. At the same time, macromolecular radicals are formed, which further promote the chain growth reaction, thereby greatly optimizing the crosslinking strength within the plasticizer system and the interaction between molecular chains. While enhancing the plasticizing effect, good comprehensive properties are maintained.

[0043] 3. By further adding a reinforcing composition and cooperating with the modified copolymer resin, the phenoxy radicals react with the double bonds in the rubber molecules to form a crosslinked network, blocking oxygen and water molecules, and improving the anti-aging and moisture resistance effects. With the combined action of aluminum diethylphosphinate and dodecyl succinic anhydride, stable products are generated by oxidation in the rubber system to interrupt the oxidation chain reaction, and are fixed on the rubber surface through a directional arrangement effect to form a physical hydrophobic layer. On the other hand, the contained succinic anhydride groups react with the hydroxyl or amino groups in the rubber molecules to generate ester bonds or amide bonds, enhancing the interfacial binding force, filling the free volume of the rubber with chemical bond interfaces, reducing the water molecule diffusion coefficient, and thereby overall enhancing the comprehensive properties of the plasticizer and the rubber system. Description of the Drawings

[0044] Figure 1 This is a physical picture of the rubber plasticizer prepared in Example 1 of this application.

[0045] Figure 2 This is a fully automatic flash point tester for the flash point test of this application. Detailed Description of the Invention

[0046] Example 1

[0047] For the temperature-resistant and anti-aging rubber plasticizer, calculated by mass, the raw materials include: 42 parts of main plasticizer, 20 parts of auxiliary plasticizer, 6.5 parts of reinforcing composition, 0.6 part of antioxidant, 0.5 part of mildew-proof agent, 3.6 parts of flame retardant, 0.8 part of leveling agent, and 4.5 parts of tackifier.

[0048] The main plasticizer is poly(propylene glycol adipate) with a weight average molecular weight of 3000 Da, sourced from Huaxiang Kejie Biotechnology in Wuhan, China.

[0049] The co-plasticizer is a modified copolymer resin. In terms of mass fraction, the preparation method specifically includes the following steps: S1: Add 30 parts of the matrix resin to 80 parts of xylene, heat at 110°C, stir at 140 rpm, and sequentially add 7 parts of perfluorohexyl acrylate and 4.5 parts of diphenylphosphoryl ethyl methacrylate under nitrogen protection; S2: Dissolve 0.5 part of diisopropylbenzene peroxide in 5 parts of xylene, add dropwise, with the dropping time of 2 h, and keep warm for 3 h after dropping; S3: Cool the reaction solution of S2 to 60°C, add 150 parts of ethanol for precipitation and filtration, and finally wash the filtered product 3 times with acetone and dry it under vacuum at 80°C for 5 h to obtain the product.

[0050] The matrix resin is a SEBS copolymer resin, with the brand YH-522, from Baling Petrochemical, China.

[0051] The reinforcing composition is a composition of aluminum diethylphosphinate, hexaphenoxycyclotriphosphazene and dodecyl succinic anhydride, with a mass ratio of 8.5:5.5:2.

[0052] The antioxidant is antioxidant 245; the mildew preventive is zinc pyrithione; the flame retardant is a composition of ammonium polyphosphate and zinc borate, with a mass ratio of 1:3, and the average particle size of zinc borate is 2.5 μm; the leveling agent is an organosiloxane BYK-378; the tackifier is rosin glyceride.

[0053] The preparation method of the temperature-resistant and anti-aging rubber plasticizer in this example specifically includes the following steps: S1: Dehydrate and dry the main plasticizer in an oven at 80°C for 2 h, with the water content of 0.06%, then add the main plasticizer and the co-plasticizer into a mixer, set the temperature at 105°C, the rotation speed at 50 rpm, and mix for 30 min to obtain a colloidal base material; S2: Add the reinforcing composition to the colloidal base material, mix at 110°C and 80 rpm for 12 min; S3: Add the remaining raw materials, cool down to 90°C, rotate at 50 rpm, and mix for 15 min. After completion, transfer the colloidal base material to a vacuum degassing machine, set the vacuum degree at -0.09 MPa, and the degassing time at 12 min. Granulate through a twin-screw extruder, with the temperature range of 90 to 115°C, and seal after completion to obtain the product.

[0054] The physical product of the temperature-resistant and anti-aging rubber plasticizer obtained in this example is as Figure 1 shown.

[0055] Example 2

[0056] The difference between Example 2 and Example 1 is that for the temperature-resistant and anti-aging rubber plasticizer, in terms of mass parts, the raw materials include: 38 parts of the main plasticizer, 21 parts of the co-plasticizer, 6 parts of the reinforcing composition, 0.5 part of the antioxidant, 0.6 part of the mildew preventive, 3.5 parts of the flame retardant, 0.8 part of the leveling agent, and 4.8 parts of the tackifier.

[0057] The reinforcing composition is a composition of aluminum diethylphosphinate, hexaphenoxycyclotriphosphazene and dodecyl succinic anhydride, and the mass ratio is 10:4.5:1.5.

[0058] The other implementation schemes are the same.

[0059] Example 3

[0060] The difference between Example 3 and Example 1 is that the heat-resistant and anti-aging rubber plasticizer, by mass, comprises the following raw materials: 46 parts of a main plasticizer, 18 parts of an auxiliary plasticizer, 7 parts of a reinforcing composition, 0.6 part of an antioxidant, 0.5 part of a mildew-proof agent, 3.8 parts of a flame retardant, 0.8 part of a leveling agent, and 4.4 parts of a tackifier.

[0061] The reinforcing composition is a composition of aluminum diethylphosphinate, hexaphenoxycyclotriphosphazene and dodecyl succinic anhydride, and the mass ratio is 7:6:3.

[0062] The other implementation schemes are the same.

[0063] Comparative Example 1

[0064] The difference between Comparative Example 1 and Example 1 is that the heat-resistant and anti-aging rubber plasticizer, by mass, comprises the following raw materials: 57 parts of a main plasticizer, 5 parts of an auxiliary plasticizer, 6.5 parts of a reinforcing composition, 0.6 part of an antioxidant, 0.5 part of a mildew-proof agent, 3.6 parts of a flame retardant, 0.8 part of a leveling agent, and 4.5 parts of a tackifier.

[0065] The other implementation schemes are the same.

[0066] Comparative Example 2

[0067] The difference between Comparative Example 2 and Example 1 is that the heat-resistant and anti-aging rubber plasticizer, by mass, comprises the following raw materials: 46 parts of a main plasticizer, 20 parts of an auxiliary plasticizer, 2.5 parts of a reinforcing composition, 0.6 part of an antioxidant, 0.5 part of a mildew-proof agent, 3.6 parts of a flame retardant, 0.8 part of a leveling agent, and 4.5 parts of a tackifier.

[0068] The other implementation schemes are the same.

[0069] Comparative Example 3

[0070] The difference between Comparative Example 3 and Example 1 lies in that the auxiliary plasticizer is a modified copolymer resin. By mass fraction, the preparation method specifically includes the following steps: S1: Add 50 parts of matrix resin to 80 parts of xylene, heat at 110°C, stir at 140 rpm, and sequentially add 5 parts of perfluorohexyl acrylate and 1.5 parts of diphenylphosphoryl ethyl methacrylate under nitrogen protection; S2: Dissolve 0.5 part of diisopropylbenzene peroxide in 5 parts of xylene, add it dropwise, with a dropping time of 2 h, and keep warm for 3 h after dropping; S3: Cool the reaction solution of S2 to 60°C, add 150 parts of ethanol to precipitate and filter, and finally wash the filtered product with acetone 3 times and dry it in vacuum at 80°C for 5 h to obtain the product.

[0071] Other implementation schemes are the same.

[0072] Comparative Example 4

[0073] The difference between Comparative Example 4 and Example 1 lies in that the auxiliary plasticizer is a SEBS copolymer resin, with the brand YH-522, from Baling Petrochemical, China.

[0074] Other implementation schemes are the same.

[0075] Comparative Example 5

[0076] The difference between Comparative Example 5 and Example 1 lies in that the auxiliary plasticizer is a modified copolymer resin. By mass fraction, the preparation method specifically includes the following steps: S1: Add 25 parts of matrix resin to 80 parts of xylene, heat at 110°C, stir at 140 rpm, and sequentially add 15 parts of perfluorohexyl acrylate and 8.5 parts of diphenylphosphoryl ethyl methacrylate under nitrogen protection; S2: Dissolve 0.5 part of diisopropylbenzene peroxide in 5 parts of xylene, add it dropwise, with a dropping time of 2 h, and keep warm for 3 h after dropping; S3: Cool the reaction solution of S2 to 60°C, add 150 parts of ethanol to precipitate and filter, and finally wash the filtered product with acetone 3 times and dry it in vacuum at 80°C for 5 h to obtain the product.

[0077] Other implementation schemes are the same.

[0078] Comparative Example 6

[0079] The difference between Comparative Example 6 and Example 1 lies in that the reinforcing composition is a composition of aluminum diethylphosphinate, hexaphenoxycyclotriphosphazene and dodecyl succinic anhydride, with a mass ratio of 2:8:0.5.

[0080] Other implementation schemes are the same.

[0081] Comparative Example 7

[0082] The difference between Comparative Example 7 and Example 1 lies in that the reinforcing composition is a composition of aluminum diethylphosphinate, hexaphenoxycyclotriphosphazene, and dodecyl succinic anhydride, with a mass ratio of 9:0.5:3.

[0083] In addition, other embodiments are the same.

[0084] Performance testing

[0085] 1. Mix the plasticizers (20 parts) prepared in the examples and comparative examples with a rubber matrix (100 parts of ethylene-propylene-diene rubber, Dow IP 4725) and a vulcanization system (1.5 parts of sulfur, 1 part of accelerator CZ), and vulcanize at 160 °C for 15 minutes to make a standard film with a thickness of 2 mm; Test method: Hardness: Shore A hardness tester, 23 °C ± 2 °C, 50% RH, take the average value of 5 points, Tensile properties: dumbbell-shaped specimen (Type C), tensile machine test speed 500 mm / min, and the test results are averaged over 10 tests and recorded in Table 1.

[0086] 2. Using the specimens in Performance Test 1, conduct a heat and aging resistance test according to the standard ASTM D573. The specimens are suspended in a heat aging oven at 180 °C ± 2 °C for 1000 h. After cooling to room temperature, measure the elongation at break retention rate of the specimens before and after the test. The test results are averaged over 10 tests and recorded in Table 1.

[0087] 3. Using the specimens in Performance Test 1, conduct a moisture resistance test according to the standard ASTM D570. The specimens (25 × 25 × 2 mm 3 ) are placed in a constant temperature and humidity chamber (40 °C ± 1 °C, 95% RH) and soaked for 30 days. After drying the surface moisture, weigh and calculate the water absorption rate. The test results are averaged over 10 tests and recorded in Table 1.

[0088] 4. The plasticizers prepared in the examples and comparative examples are tested for flash point using the SYD-3536D full-automatic flash point tester as Figure 2 shown. The test results are averaged over 10 tests and recorded in Table 1.

[0089] Table 1 Performance test result table

[0090]

[0091]

[0092] Judging from the final test results shown in Table 1, in Comparative Examples 1 and 2, the overall comprehensive performance decreased because the appropriate mass portions of co-plasticizer and reinforcing composition were not used.

[0093] In Comparative Examples 3 - 5, the overall comprehensive performance decreased because the correct modified copolymer resin was not used as the co-plasticizer.

[0094] Comparative Examples 6 and 7 did not adopt the correct compounding combination of the enhancing composition, resulting in a decline in the overall comprehensive performance.

Claims

1. A heat-resistant and anti-aging rubber plasticizer, characterized in that: In parts by mass, it at least includes 30 - 50 parts of a main plasticizer and 15 - 25 parts of an auxiliary plasticizer; The main plasticizer is polypropylene adipate or polypropylene sebacate; The weight-average molecular weight of the main plasticizer is 2000 - 4000 Da; The auxiliary plasticizer is a modified copolymer resin, and the preparation method includes: S1: adding a matrix resin to an organic solvent, heating and dissolving, then adding perfluorohexyl acrylate and diphenylphosphoryl ethyl methacrylate in sequence, under nitrogen protection; S2: dropwise adding diisopropylbenzene peroxide and then keeping the temperature for reaction; S3: cooling, precipitating and filtering the reaction solution, washing the filtered product and drying it under vacuum to obtain it; The mass ratio of the matrix resin, perfluorohexyl acrylate and diphenylphosphoryl ethyl methacrylate is (20 - 35):(5 - 10):(3 - 8).

2. The heat-resistant and anti-aging rubber plasticizer according to claim 1, characterized in that: The matrix resin is a SEBS copolymer resin.

3. The temperature-resistant and anti-aging rubber plasticizer according to claim 2, wherein: The mass ratio of the matrix resin, perfluorohexyl acrylate and diphenylphosphoryl ethyl methacrylate is (25 - 30):(6 - 8):(4 - 4.5).

4. The temperature-resistant and anti-aging rubber plasticizer according to claim 1, wherein: The mass ratio of the main plasticizer and the auxiliary plasticizer is (35 - 48):(18 - 23).

5. The temperature-resistant and anti-aging rubber plasticizer according to claim 1, wherein: The heat-resistant and anti-aging rubber plasticizer, in parts by mass, further includes: 5 - 8 parts of a reinforcing composition, 0.5 - 1 part of an antioxidant, 0.5 - 1 part of a mildew-proof agent, 2 - 4 parts of a flame retardant, 0.5 - 1 part of a leveling agent, and 3 - 6 parts of a tackifier.

6. The temperature-resistant and anti-aging rubber plasticizer according to claim 5, characterized in that: The reinforcing composition is a composition of aluminum diethylphosphinate, a phosphazene compound and dodecyl succinic anhydride, and the mass ratio is (7 - 10):(4 - 8):(1 - 4).

7. The temperature-resistant and anti-aging rubber plasticizer according to claim 6, characterized in that: The phosphazene compound is hexaphenoxycyclotriphosphazene.

8. The heat-resistant and anti-aging rubber plasticizer according to claim 7, characterized in that: The leveling agent is an acrylate or an organosiloxane.

9. The heat-resistant and anti-aging rubber plasticizer according to claim 8, characterized in that: The flame retardant is a composition of ammonium polyphosphate and zinc borate, and the mass ratio is (0.8 - 1.4):(3 - 4); the average particle size of the zinc borate is 2 - 4 μm.

10. A preparation method of the temperature-resistant and anti-aging rubber plasticizer according to claim 1, characterized in that: Specifically, it includes the following steps: S1: dehydrating and drying the main plasticizer in an oven at 75 - 80 °C for 2 - 2.5 h, with the water content ≤ 0.1%, then adding the main plasticizer and the auxiliary plasticizer to a kneader, setting the temperature at 95 - 105 °C, the rotation speed at 40 - 60 rpm, and kneading for 20 - 30 min to obtain a colloidal base material; S2: adding the reinforcing composition to the colloidal base material, kneading at 110 - 120 °C and 60 - 80 rpm for 10 - 15 min; S3: adding the remaining raw materials, cooling to 85 - 95 °C, 40 - 60 rpm, kneading for 10 - 15 min, after completion, transferring the colloidal base material to a vacuum degassing machine, setting the vacuum degree at -0.09 - -0.08 MPa, the degassing time at 10 - 15 min, granulating through a twin-screw extruder, with the temperature range of 90 - 115 °C, and sealing after completion to obtain.

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