High temperature resistant vinyl copolymer rubber tube and preparation method thereof

Abstract

This invention relates to the field of polymer materials technology, and discloses a high-temperature resistant vinyl copolymer hose and its preparation method. The hose uses a copolymer formed by copolymerizing ethylene and vinyl acetate as the matrix, introducing a host-guest topologically confined structure constructed from cucurbituril and 1,4-bis(trimethylammonium)butane dichlorophosphate, and combining it with 4-vinylphenylboronic acid and triethylenetetramine to form a synergistic vinyl copolymer with dynamic borate ester bonds and hydrogen bonds. Benzoyl is added as an organic small molecule functional regulator, and inorganic fillers, antioxidants, lubricants, and stabilizers are used to construct a composite system. The preparation method includes the preparation of the synergistically modified vinyl copolymer and a melt blending extrusion molding process. This invention effectively constrains and dynamically regulates the molecular chain through multiple organic synergistic effects, thereby significantly improving the material's high-temperature resistance, mechanical properties, and structural stability, making it suitable for high-temperature fluid transportation applications.

Description

Technical Field

[0001] This invention belongs to the technical field of polymer materials and rubber and plastic products, specifically relating to a high-temperature resistant vinyl copolymer hose and its preparation method. Background Technology

[0002] Vinyl copolymers are widely used in fluid transport hoses due to their good flexibility, chemical resistance, and processing properties, such as industrial hoses, automotive hoses, and media-resistant hoses. Among them, copolymers formed by the copolymerization of ethylene and vinyl acetate exhibit better elasticity and low-temperature resistance in practical applications, and have become one of the commonly used hose matrix materials.

[0003] However, during long-term use in high-temperature environments such as above 120°C, vinyl copolymer hoses are prone to thermal-oxidative aging, enhanced molecular chain segment movement, and decreased interfacial bonding, leading to a decline in the material's mechanical properties, reduced dimensional stability, and shortened service life. Especially under complex operating conditions, such as the coupling of high temperature and stress, traditional vinyl copolymer systems struggle to simultaneously maintain both temperature resistance and flexibility.

[0004] Existing technologies typically improve the heat resistance of materials by introducing inorganic fillers or adding antioxidants. However, these methods mainly rely on single physical filling or chemical stabilization, resulting in problems such as poor interfacial compatibility, uneven dispersion, and limited modification effects. Furthermore, conventional small-molecule organic additives mostly only play an antioxidant or plasticizing role, lacking the ability to synergistically regulate the molecular structure of materials, making it difficult to effectively constrain the chain segment movement and microstructure of vinyl copolymers.

[0005] Therefore, how to construct a modified system with multiple mechanisms of action, which can significantly improve the high-temperature resistance of materials while ensuring their flexibility, and achieve stable control of molecular hierarchical structure, has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] To overcome the technical problems of thermo-oxidative aging, decreased mechanical properties, and insufficient structural stability of vinyl copolymer hoses under high-temperature environments, as described in the background art, the present invention aims to provide a high-temperature resistant vinyl copolymer hose and its preparation method. The present invention uses a copolymer formed by copolymerizing ethylene and vinyl acetate as the matrix, introduces a host-guest topologically confined structure constructed from cucurbituril and 1,4-bis(trimethylammonium)butane dichlorophosphate, and forms a synergistically modified vinyl copolymer with 4-vinylphenylboronic acid and triethylenetetramine through dynamic borate ester bonds and hydrogen bonds. Simultaneously, benzoyl is introduced as an organic small molecule functional regulator, and combined with inorganic fillers, antioxidants, lubricants, and stabilizers to construct a composite system. The present invention achieves effective constraint on molecular chain motion through multiple organic synergistic effects, thereby significantly improving the high-temperature resistance and structural stability of the material.

[0007] The objective of this invention can be achieved through the following technical solutions: A high-temperature resistant vinyl copolymer hose, comprising the following raw materials in parts by weight: 80-120 parts of ethylene-vinyl acetate copolymer; 10-40 parts of synergistically modified vinyl copolymer; 1-10 parts of benzoyl; 5-30 parts of inorganic filler; 0.5-5 parts of antioxidant; 0.5-3 parts of lubricant; and 0.5-5 parts of stabilizer. The synergistically modified vinyl copolymer is a material formed by modifying the ethylene-vinyl acetate copolymer through a host-guest topological confinement structure formed by cucurbituril and 1,4-bis(trimethylammonium)butane dichloro salt guest molecules, and through the synergistic effect of 4-vinylphenylboronic acid and triethylenetetramine via dynamic borate ester bonds and hydrogen bonds.

[0008] Optionally, the synergistically modified vinyl copolymer comprises the following raw materials in parts by weight: 10-40 parts of cucurbituril; 5-25 parts of 1,4-bis(trimethylammonium)butane dichloro salt; 5-30 parts of 4-vinylphenylboronic acid; 2-15 parts of triethylenetetramine; and 20-100 parts of deionized water.

[0009] Optionally, the method for preparing the synergistically modified vinyl copolymer includes the following steps: (1) Cucurbituril was assembled with 1,4-bis(trimethylammonium)butane dichloro salt via host-guest complexation to obtain a host-guest complex; (2) Add 4-vinylphenylboronic acid to the host-guest complex and react to obtain an intermediate containing a dynamic borate ester structure; (3) Triethylenetetramine was added to the intermediate containing the dynamic borate ester structure for cross-linking and compounding, and then blended with the copolymer formed by copolymerization of ethylene and vinyl acetate to obtain a synergistically modified vinyl copolymer.

[0010] Optionally, the reaction conditions for step (1) are as follows: the reaction is carried out in an aqueous system at a temperature of 30–60°C, a stirring speed of 200–500 rpm, and a reaction time of 1–3 h.

[0011] Optionally, the reaction conditions in step (2) are: adjusting the pH of the system to 8-10, the temperature to 40-80℃, and the reaction time to 2-4h.

[0012] Optionally, the reaction conditions in step (3) are a temperature of 60-120°C, a reaction time of 2-6 hours, and a stirring speed of 100-300 rpm.

[0013] Optionally, the inorganic filler is a mixture of nano-alumina and montmorillonite in a mass ratio of 1:1 to 3; the antioxidant is a mixture of 2,6-di-tert-butyl-p-cresol and tris(2,4-di-tert-butylphenyl) phosphite in a mass ratio of 1:1 to 2; the lubricant is a mixture of stearic acid and zinc stearate in a mass ratio of 1:1 to 2; and the stabilizer is a mixture of calcium stearate and zinc stearate in a mass ratio of 1:1 to 3.

[0014] Optionally, a method for preparing a high-temperature resistant vinyl copolymer hose includes the following steps: S1, ethylene-vinyl acetate copolymer, synergistically modified vinyl copolymer, benzoyl, inorganic filler, antioxidant, lubricant and stabilizer are mixed to obtain a uniform mixture; S2, the mixture is melt-blended to obtain a melt composite material; S3, the molten composite material is extruded and cooled to obtain a high-temperature resistant vinyl copolymer hose.

[0015] Optionally, the reaction conditions for step S1 are as follows: the reaction is carried out at room temperature, the stirring speed is 200-500 rpm, and the mixing time is 15-30 min, so that the components are evenly dispersed; the reaction conditions for step S2 are as follows: the reaction is carried out in an internal mixer or a twin-screw extruder, the temperature is 170-210℃, the screw speed is 60-120 rpm, and the mixing time is 8-15 min, so that the material is fully plasticized and evenly dispersed; the reaction conditions for step S3 are as follows: the extrusion temperature is 180-220℃, the extrusion pressure is 5-15 MPa, and after extrusion through a die, the material is cooled and shaped in a water bath at 15-25℃.

[0016] The beneficial effects of this invention are: This invention constructs a host-guest topological confinement structure formed by cucurbituril and 1,4-bis(trimethylammonium)butane dichlorophosphate, and combines it with a dynamic boronic acid ester bond and hydrogen bond synergistic network formed by 4-vinylphenylboronic acid and triethylenetetramine to synergistically modify copolymers formed by copolymerization of ethylene and vinyl acetate. At the same time, benzoyl is introduced as an organic small molecule functional regulator, so that the molecular chain is effectively spatially confined under high temperature conditions and has the ability to dynamically reconstruct. Thus, while maintaining the flexibility of the material, its heat deformation resistance and thermo-oxidative aging resistance are significantly improved, and the interfacial bonding strength and overall structural stability are further improved. The resulting hose can maintain excellent mechanical properties and extend its service life under high temperature environment. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1This is a comparison of the infrared spectra of vinyl copolymers and synergistically modified vinyl copolymers. Detailed Implementation

[0019] 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.

[0020] Example 1: The purpose of this example is to provide a high-temperature resistant vinyl copolymer hose preparation scheme with low raw material dosage and reaction conditions, to verify the feasibility of the present invention under low dosage conditions.

[0021] S1, 10 parts of cucurbituril and 5 parts of 1,4-bis(trimethylammonium)butane dichloro salt were added to 20 parts of deionized water and stirred at 200 rpm for 1 h at 30 °C to perform host-guest complex assembly, obtaining a host-guest complex; then 5 parts of 4-vinylphenylboronic acid were added to the system and reacted at pH 8 and 40 °C for 2 h to obtain an intermediate containing a dynamic borate ester structure; then 2 parts of triethylenetetramine were added to the system and stirred at 100 rpm for 2 h at 60 °C to perform crosslinking composite, and then blended with 80 parts of ethylene-vinyl acetate copolymer to obtain a synergistically modified vinyl copolymer; S2, 80 parts of ethylene-vinyl acetate copolymer, 10 parts of synergistically modified vinyl copolymer, 1 part of benzoyl, 5 parts of a mixture of nano-alumina and montmorillonite, 0.5 parts of a mixture of 2,6-di-tert-butyl-p-cresol and tris(2,4-di-tert-butylphenyl) phosphite, 0.5 parts of a mixture of stearic acid and zinc stearate, and 0.5 parts of a mixture of calcium stearate and zinc stearate were mixed and kneaded at 60 rpm for 8 minutes at 170°C to obtain a molten composite material; S3, the molten composite material is extruded at 180°C and 5MPa, and then cooled and shaped in a 15°C water bath to obtain a high-temperature resistant vinyl copolymer hose.

[0022] Example 2: The purpose of this example is to obtain a high-temperature resistant vinyl copolymer hose with optimal overall temperature resistance, mechanical properties and structural stability.

[0023] S1, 25 parts of cucurbituril and 15 parts of 1,4-bis(trimethylammonium)butane dichlorophosphate were added to 60 parts of deionized water and stirred at 350 rpm for 2 h at 45 °C to perform host-guest complexation assembly, obtaining a host-guest complex; then 15 parts of 4-vinylphenylboronic acid were added to the system and reacted at pH 9 and 60 °C for 3 h to obtain an intermediate containing a dynamic borate ester structure; then 8 parts of triethylenetetramine were added to the system and stirred at 200 rpm for 4 h at 90 °C to perform crosslinking composite, and then blended with 100 parts of ethylene-vinyl acetate copolymer to obtain a synergistically modified vinyl copolymer; according to Figure 1 Infrared spectral comparison results show that the copolymer formed by copolymerization of ethylene and vinyl acetate before modification mainly exhibits the characteristic peak of C=O of the ester group at 1730 cm⁻¹ and the C–H stretching vibration peak near 2900 cm⁻¹, with a relatively simple overall peak shape. After modification, a significant broad peak appears near 3300 cm⁻¹, indicating the introduction of N–H or O–H hydrogen bonding in the system. New absorption peaks appear near 1600 cm⁻¹ and 1500 cm⁻¹, indicating the successful introduction of aromatic ring and amine structures. At the same time, the absorption peak in the 1200–1100 cm⁻¹ region is significantly enhanced, indicating the formation of borate ester-related structures. These changes indicate that the synergistic modification system has been successfully constructed, and multiple effects have enhanced intermolecular interactions and improved the structural stability of the material. S2, 100 parts of ethylene-vinyl acetate copolymer, 25 parts of synergistically modified vinyl copolymer, 5 parts of benzoyl, 15 parts of a mixture of nano-alumina and montmorillonite, 2 parts of a mixture of 2,6-di-tert-butyl-p-cresol and tris(2,4-di-tert-butylphenyl) phosphite, 1.5 parts of a mixture of stearic acid and zinc stearate, and 2 parts of a mixture of calcium stearate and zinc stearate are mixed and kneaded at 90 rpm for 12 min at 190°C to obtain a molten composite material; S3, the molten composite material is extruded at 200°C and 10MPa, and then cooled and shaped in a 20°C water bath to obtain a high-temperature resistant vinyl copolymer hose.

[0024] Example 3: The purpose of this example is to verify the high-temperature resistance limit and structural stability of the material under conditions of high addition amount and high reaction intensity.

[0025] S1, 40 parts of cucurbituril and 25 parts of 1,4-bis(trimethylammonium)butane dichlorophosphate were added to 100 parts of deionized water and stirred at 500 rpm for 3 h at 60 °C to perform host-guest complex assembly, obtaining a host-guest complex; then 30 parts of 4-vinylphenylboronic acid were added to the system and reacted at pH 10 and 80 °C for 4 h to obtain an intermediate containing a dynamic borate ester structure; then 15 parts of triethylenetetramine were added to the system and stirred at 300 rpm for 6 h at 120 °C to perform crosslinking composite, and then blended with 120 parts of ethylene-vinyl acetate copolymer to obtain a synergistically modified vinyl copolymer; S2, 120 parts of ethylene-vinyl acetate copolymer, 40 parts of synergistically modified vinyl copolymer, 10 parts of benzoyl, 30 parts of a mixture of nano-alumina and montmorillonite, 5 parts of a mixture of 2,6-di-tert-butyl-p-cresol and tris(2,4-di-tert-butylphenyl) phosphite, 3 parts of a mixture of stearic acid and zinc stearate, and 5 parts of a mixture of calcium stearate and zinc stearate are mixed and kneaded at 120 rpm for 15 min at 210°C to obtain a molten composite material; S3, the molten composite material is extruded at 220°C and 15MPa and then cooled and shaped in a 25°C water bath to obtain a high-temperature resistant vinyl copolymer hose.

[0026] Comparative Example 1: The purpose of this comparative example is to verify the influence of the subject-object topological confinement structure on the material properties.

[0027] S1, 15 parts of 1,4-bis(trimethylammonium)butane dichloro salt were added to 60 parts of deionized water and stirred at 350 rpm for 2 h at 45 °C to obtain a homogeneous solution; then 15 parts of 4-vinylphenylboronic acid were added to the system and reacted at pH 9 and 60 °C for 3 h to obtain an intermediate containing a dynamic borate ester structure; then 8 parts of triethylenetetramine were added to the system and stirred at 200 rpm for 4 h at 90 °C to perform crosslinking and compounding, and then blended with 100 parts of ethylene-vinyl acetate copolymer to obtain a single dynamic network modified vinyl copolymer; S2, 100 parts of ethylene-vinyl acetate copolymer, 25 parts of single dynamic network modified vinyl copolymer, 5 parts of benzoyl, 15 parts of nano alumina and montmorillonite mixture, 2 parts of 2,6-di-tert-butyl-p-cresol and tris(2,4-di-tert-butylphenyl) phosphite mixture, 1.5 parts of stearic acid and zinc stearate mixture, and 2 parts of calcium stearate and zinc stearate mixture are mixed and kneaded at 90 rpm for 12 min at 190°C to obtain a molten composite material; S3, the molten composite material is extruded at 200°C and 10MPa, and then cooled and shaped in a water bath at 20°C to obtain a vinyl copolymer hose.

[0028] Comparative Example 2: The purpose of this comparative example is to verify the effect of the synergistic effect of dynamic borate ester bonds and hydrogen bonds on material properties.

[0029] S1, 25 parts of cucurbituril and 15 parts of 1,4-bis(trimethylammonium)butane dichloro salt were added to 60 parts of deionized water and stirred at 350 rpm for 2 hours at 45°C to perform host-guest complex assembly, thereby obtaining a host-guest complex; then the host-guest complex was directly blended with 100 parts of ethylene-vinyl acetate copolymer to obtain a single host-guest modified vinyl copolymer. S2, 100 parts of ethylene-vinyl acetate copolymer, 25 parts of single host-guest modified vinyl copolymer, 5 parts of benzoyl, 15 parts of nano-alumina and montmorillonite mixture, 2 parts of 2,6-di-tert-butyl-p-cresol and tris(2,4-di-tert-butylphenyl) phosphite mixture, 1.5 parts of stearic acid and zinc stearate mixture, and 2 parts of calcium stearate and zinc stearate mixture are mixed and kneaded at 90 rpm for 12 min at 190°C to obtain a molten composite material; S3, the molten composite material is extruded at 200°C and 10MPa, and then cooled and shaped in a water bath at 20°C to obtain a vinyl copolymer hose.

[0030] Comparative Example 3: The purpose of this comparative example is to verify the effect of organic small molecule functional regulators on the heat resistance of materials.

[0031] S1, 25 parts of cucurbituril and 15 parts of 1,4-bis(trimethylammonium)butane dichlorophosphate were added to 60 parts of deionized water and stirred at 350 rpm for 2 h at 45 °C to perform host-guest complex assembly, obtaining a host-guest complex; then 15 parts of 4-vinylphenylboronic acid were added to the system and reacted at pH 9 and 60 °C for 3 h to obtain an intermediate containing a dynamic borate ester structure; then 8 parts of triethylenetetramine were added to the system and stirred at 200 rpm for 4 h at 90 °C to perform crosslinking composite, and then blended with 100 parts of ethylene-vinyl acetate copolymer to obtain a synergistically modified vinyl copolymer; S2, 100 parts of ethylene-vinyl acetate copolymer, 25 parts of synergistically modified vinyl copolymer, 15 parts of a mixture of nano-alumina and montmorillonite, 2 parts of a mixture of 2,6-di-tert-butyl-p-cresol and tris(2,4-di-tert-butylphenyl) phosphite, 1.5 parts of a mixture of stearic acid and zinc stearate, and 2 parts of a mixture of calcium stearate and zinc stearate are mixed and kneaded at 90 rpm for 12 min at 190°C to obtain a molten composite material; S3, the molten composite material is extruded at 200°C and 10MPa, and then cooled and shaped in a water bath at 20°C to obtain a vinyl copolymer hose.

[0032] Performance testing: 1. High Temperature Resistance Test Method The tubing prepared in the examples and comparative examples was cut into samples with a length of 100 mm and a uniform inner diameter. After cleaning the surface, the samples were placed in a forced-air constant temperature aging chamber and subjected to heat aging treatment at 150°C. The samples were taken out after 24 h, 72 h and 168 h, respectively, and after naturally cooling to room temperature, the surface was observed to see if cracking, discoloration or deformation occurred. Subsequently, the samples were subjected to tensile testing using an electronic universal testing machine, and the changes in tensile strength and elongation at break were recorded to evaluate the material's ability to retain performance under high temperature conditions.

[0033] 2. Tensile property test method The tubing prepared in the examples and comparative examples was cut axially and made into standard dumbbell-shaped specimens with consistent thickness and width. After being placed at room temperature for 24 hours, tensile tests were performed using an electronic universal testing machine with a tensile speed of 50 mm / min. The maximum tensile strength and elongation at break were recorded during the test. Each group of specimens was tested at least 3 times and the average value was taken to evaluate the mechanical properties of the material.

[0034] 3. Test methods for heat distortion properties The tubing prepared in the examples and comparative examples was cut into 50 mm long samples and placed in a heat deformation test device under constant load. The samples were heated to 140 °C at a certain heating rate and held for 60 min. The deformation of the samples during the heating process and the final deformation change were recorded to evaluate the material’s resistance to deformation and dimensional stability under high temperature conditions.

[0035] 4. Test method for performance retention after heat aging After the rubber tube samples prepared in the examples and comparative examples were cut to uniform size, they were placed in an aging chamber and aged at 140°C for 120 hours. After being taken out, they were placed at room temperature for 12 hours to restore their condition. Then, tensile tests were performed using an electronic universal testing machine, and the changes in tensile strength and elongation at break before and after aging were recorded to evaluate the material's ability to retain its performance under long-term thermal aging conditions.

[0036] Table 1 Performance Test Results

[0037] As shown in Table 1, the examples and comparative examples showed significant differences in various performance indicators. Among them, Example 2 showed the best performance in terms of tensile strength, elongation at break, heat deformation, and strength retention after heat aging, indicating that its overall performance was the best. The overall performance of the examples was better than that of the comparative examples, indicating that the synergistic modification system constructed by the present invention has significant effects.

[0038] In terms of tensile properties, the tensile strength and elongation at break of Examples 1 to 3 were significantly higher than those of the comparative example. Among them, the tensile strength of Example 2 reached 24.8 MPa and the elongation at break reached 410%, indicating that the synergistic effect of host-guest structure, dynamic borate ester bond and hydrogen bond can effectively enhance the interaction between molecular chains and improve the load-bearing capacity and ductility of the material. In contrast, the mechanical properties of the comparative example were significantly reduced due to the lack of a complete synergistic structure.

[0039] In terms of heat deformation performance, the heat deformation of the examples is significantly lower than that of the comparative examples, with Example 2 showing a deformation of only 1.8 mm. This indicates that the synergistic modification system can effectively restrict the movement of molecular chains under high temperature conditions and improve the dimensional stability of the material. In contrast, the comparative examples are more prone to deformation at high temperatures, indicating that their structural stability is insufficient.

[0040] In terms of thermal aging performance, the strength retention rate of the examples after thermal aging is significantly better than that of the comparative examples, with Example 2 reaching 91%. This indicates that the system can effectively inhibit the thermo-oxidative aging process and maintain the mechanical properties of the material. In contrast, the comparative examples show more significant performance degradation due to the lack of synergistic regulatory structures or functional small molecules.

[0041] In summary, this invention achieves effective control over the molecular structure of vinyl copolymers by constructing a host-guest topological confinement structure, a dynamic borate ester bond and hydrogen bond synergistic system, and introducing organic small molecule functional regulators, thereby significantly improving the mechanical properties, high-temperature resistance and long-term stability of the material.

Claims

1. A high temperature resistant vinyl copolymer tube, characterized by, The hose comprises the following raw materials in parts by weight: 80-120 parts of ethylene-vinyl acetate copolymer; 10-40 parts of synergistically modified vinyl copolymer; 1-10 parts of benzoyl; 5-30 parts of inorganic filler; 0.5-5 parts of antioxidant; 0.5-3 parts of lubricant; and 0.5-5 parts of stabilizer. The synergistically modified vinyl copolymer is a material formed by modifying ethylene-vinyl acetate copolymer through the synergistic effect of cucurbituril and 1,4-bis(trimethylammonium)butane dichloro salt guest molecules to form a host-guest topological confinement structure, and through the synergistic effect of 4-vinylphenylboronic acid and triethylenetetramine via dynamic borate ester bonds and hydrogen bonds.

2. The high temperature resistant vinyl copolymer tube according to claim 1, characterized in that, The synergistically modified vinyl copolymer comprises the following raw materials in parts by weight: 10-40 parts of cucurbituril; 5-25 parts of 1,4-bis(trimethylammonium)butane dichloro salt; 5-30 parts of 4-vinylphenylboronic acid; 2-15 parts of triethylenetetramine; and 20-100 parts of deionized water.

3. The high temperature resistant vinyl copolymer tube according to claim 1 or 2, characterized in that, The method for preparing the synergistically modified vinyl copolymer includes the following steps: (1) Cucurbituril was assembled with 1,4-bis(trimethylammonium)butane dichloro salt via host-guest complexation to obtain a host-guest complex; (2) Add 4-vinylphenylboronic acid to the host-guest complex and react to obtain an intermediate containing a dynamic borate ester structure; (3) Triethylenetetramine was added to the intermediate containing the dynamic borate ester structure for cross-linking and compounding, and then blended with the copolymer formed by copolymerization of ethylene and vinyl acetate to obtain a synergistically modified vinyl copolymer.

4. The high temperature resistant vinyl copolymer tube according to claim 3, characterized in that, The reaction conditions for step (1) are as follows: the reaction is carried out in an aqueous system at a temperature of 30-60°C, a stirring speed of 200-500 rpm, and a reaction time of 1-3 h.

5. The high temperature resistant vinyl copolymer tube according to claim 3, characterized in that, The reaction conditions for step (2) are: adjusting the pH of the system to 8-10, the temperature to 40-80℃, and the reaction time to 2-4h.

6. The high temperature resistant vinyl copolymer tube according to claim 3, characterized in that, The reaction conditions for step (3) are a temperature of 60-120℃, a reaction time of 2-6h, and a stirring speed of 100-300rpm.

7. The high-temperature resistant vinyl copolymer hose according to claim 1, characterized in that, The inorganic filler is composed of nano-alumina and montmorillonite mixed in a mass ratio of 1:1 to 3; the antioxidant is composed of 2,6-di-tert-butyl-p-cresol and tris(2,4-di-tert-butylphenyl) phosphite mixed in a mass ratio of 1:1 to 2; the lubricant is composed of stearic acid and zinc stearate mixed in a mass ratio of 1:1 to 2; and the stabilizer is composed of calcium stearate and zinc stearate mixed in a mass ratio of 1:1 to 3.

8. A method for preparing a high-temperature resistant vinyl copolymer hose, characterized in that, The preparation method includes the following steps: S1, ethylene-vinyl acetate copolymer, synergistically modified vinyl copolymer, benzoyl, inorganic filler, antioxidant, lubricant and stabilizer are mixed to obtain a uniform mixture; S2, the mixture is melt-blended to obtain a melt composite material; S3, the molten composite material is extruded and cooled to obtain a high-temperature resistant vinyl copolymer hose.

9. The method for preparing a high-temperature resistant vinyl copolymer hose according to claim 8, characterized in that, The reaction conditions for step S1 are as follows: the reaction is carried out at room temperature, the stirring speed is 200-500 rpm, and the mixing time is 15-30 min, so that the components are evenly dispersed. The reaction conditions for step S2 are as follows: the reaction is carried out in an internal mixer or a twin-screw extruder, the temperature is 170-210℃, the screw speed is 60-120 rpm, and the mixing time is 8-15 min, so that the material is fully plasticized and evenly dispersed. The reaction conditions for step S3 are as follows: the extrusion temperature is 180-220℃, the extrusion pressure is 5-15 MPa, and after extrusion through a die, the material is cooled and shaped in a water bath at 15-25℃.

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