High-temperature-resistant geotextile and preparation method thereof

Abstract

The application provides a high-temperature-resistant geotextile and a preparation method thereof, and belongs to the field of building materials. By grafting maleic anhydride on benzene diamine aminated polyether ether ketone, a gradient polar group distribution is formed, the interface bonding force and the compatibility are improved; meanwhile, the polyether sulfone is modified by introducing carboxyl and epoxy groups, a complementary network is formed, the matrix toughness and the interface bonding force are enhanced; the phosphate provides a polar bonding site on the surface of aluminum nitride, the ionic liquid forms a heat conduction network, and the heat conduction efficiency is improved; the silane group provides a chemical bonding site on the surface of silicon carbide, and the dopamine forms a secondary structure thereon, and the interface bonding force is enhanced; the polyether ether ketone with the amino-maleic anhydride structure is interwoven with the carboxyl-epoxy group of the polyether sulfone, a interpenetrating network is formed, and the matrix toughness and the thermal stability are improved; the multi-level interface structure of aluminum nitride and silicon carbide is helpful to uniform stress transmission and interface firmness.

Description

Technical Field

[0001] This invention belongs to the field of building materials technology and relates to a high-temperature resistant geotextile and its preparation method. Background Technology

[0002] Geotextiles are functional materials widely used in civil engineering, environmental protection, and construction. They are primarily used to enhance soil stability, control soil erosion, and provide filtration and drainage. These materials are designed to improve soil properties by providing physical barriers, thereby enhancing the durability and safety of engineering projects. The main materials of geotextiles are typically polymers, such as polypropylene and polyester, which are widely used due to their excellent mechanical properties, corrosion resistance, and economic efficiency.

[0003] Polypropylene and polyester are currently the most commonly used materials for geotextiles. Polypropylene is widely used in various civil engineering projects due to its lightweight, high strength, and good chemical resistance. Polyester, on the other hand, is favored for its excellent tensile strength and heat resistance, making it particularly suitable for applications requiring heavy loads. However, while traditional geotextiles perform well in conventional civil engineering applications, they exhibit significant shortcomings in high-temperature environments.

[0004] Many geotextiles exhibit relatively poor performance under high-temperature conditions. Commonly used materials such as polypropylene and polyester are prone to thermal deformation, melting, or strength reduction in high-temperature environments. This thermal deformation not only leads to dimensional instability in the geotextile but can also affect its bonding strength with the soil, thereby reducing its effectiveness in soil reinforcement and water and soil conservation. In certain specific applications, such as road construction and tunnel engineering, geotextiles often need to operate for extended periods in high-temperature or high-heat environments. Under these conditions, traditional geotextiles may fail to meet design requirements, resulting in decreased project quality and increased safety hazards. For example, if the geotextile melts or deforms, it may lead to soil erosion and structural collapse, directly affecting the safety and service life of the project. Furthermore, in high-temperature landfill operations, for instance, geotextiles need to withstand the high temperatures and pressures from the fill soil. If the geotextile's strength is insufficient, it may fail, leading to a series of engineering problems. Therefore, the fragility of traditional materials under high-temperature conditions limits their application potential in some critical projects, especially in areas with high temperature and pressure requirements, such as the construction of landfills and soil stabilization for thermal power plants. Summary of the Invention

[0005] To address the aforementioned problems, the present invention aims to provide a high-temperature resistant geotextile and its preparation method. First, by amylating polyetheretherketone with phenylenediamine and grafting maleic anhydride to form a gradient polar group distribution, the interfacial bonding strength and compatibility are improved. Simultaneously, carboxyl and epoxy groups are introduced to modify polyethersulfone, forming a complementary network that enhances the toughness of the matrix and the interfacial bonding ability. Second, phosphate esters provide polar binding sites on the aluminum nitride surface, and ionic liquids form a thermally conductive network on it, improving thermal conductivity. Silyl groups provide chemical bonding sites on the silicon carbide surface, and dopamine forms a secondary structure on it, enhancing the interfacial bonding ability. Finally, the amino-maleic anhydride structure of the amylated polyetheretherketone and the carboxyl-epoxy structure of the polyethersulfone interpenetrate to form an interpenetrating network structure, improving the toughness and thermal stability of the matrix. The multi-layered interfacial structure of aluminum nitride and silicon carbide helps to uniformly transfer stress and improve interfacial strength.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a method for preparing a high-temperature resistant geotextile, the method comprising:

[0008] S1: Polyether ether ketone (PEEEK) is dispersed in concentrated sulfuric acid to obtain a PEEK dispersion. After stirring, p-phenylenediamine is added to obtain a pre-reaction solution. After reacting at a constant temperature, reaction solution A is obtained. This solution is poured into deionized water and stirred to obtain a pretreated precipitate. The precipitate is filtered, washed, and vacuum dried to obtain an aminated PEEK intermediate. The aminated PEEK intermediate is mixed with maleic anhydride and benzoyl peroxide initiator to obtain reaction solution B. The mixture is melted and reacted under nitrogen protection, and then cooled and granulated to obtain modified PEEK.

[0009] S2: Polyethersulfone is mixed with N-methylpyrrolidone, and 4-aminobenzoic acid is added to obtain reaction solution C. After stirring the reaction, it is poured into deionized water and filtered to obtain pretreated polyethersulfone. After washing, it is vacuum dried to obtain carboxylated polyethersulfone intermediate. The carboxylated polyethersulfone intermediate is melt-mixed with glycidyl methacrylate under a nitrogen atmosphere, cooled and granulated to obtain modified polyethersulfone.

[0010] S3: Aluminum nitride is mixed with tetrahydrofuran, dodecyl phosphate and triethylamine are added to obtain reaction solution D. The mixture is stirred and reacted. After centrifugation, the first modified aluminum nitride is obtained. It is dispersed in an acetonitrile solution of [BMIM]PF6 to obtain reaction solution E. After ultrasonic treatment, it is vacuum dried to obtain modified aluminum nitride.

[0011] S4: Mix silicon carbide powder with ethanol / water mixed solution, add polyvinylpyrrolidone to obtain mixed solution, ultrasonically disperse and add mixed coupling agent to obtain reaction solution F, reflux and centrifuge to obtain first-treated silicon carbide, disperse it in Tris buffer, add dopamine hydrochloride, stir at room temperature, filter, wash and vacuum dry to obtain modified silicon carbide.

[0012] S5: Modified polyether ether ketone, modified polyether sulfone and antioxidant are added to a high-speed mixer and mixed. Modified silicon carbide and modified aluminum nitride are added and mixed to obtain a mixture. The mixture is added to a twin-screw extruder and extruded. The extrudate is collected and melt-spun. The resulting spun yarn is laid flat on the mesh screen of a web forming machine and consolidated by a needle punch to obtain a rough geotextile. The tension is adjusted by a tension frame and the yarn is cut and rolled into a roll to obtain a high-temperature resistant geotextile.

[0013] As a preferred technical solution of the present invention, in step S1, the mass ratio of polyetheretherketone to concentrated sulfuric acid is 1:15-20, for example, it can be 1:15, 1:15.5, 1:16, 1:16.5, 1:17, 1:17.5, 1:18, 1:18.5, 1:19, 1:19.5 or 1:20, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0014] In some optional embodiments, the mass ratio of p-phenylenediamine to polyetheretherketone is 3-4:100, for example, it can be 3:100, 3.1:100, 3.2:100, 3.3:100, 3.4:100, 3.5:100, 3.6:100, 3.7:100, 3.8:100, 3.9:100 or 4:100, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0015] In some optional embodiments, the temperature of the pre-reaction liquid isothermal reaction is 75-85°C, for example, it can be 75.0°C, 76.0°C, 77.0°C, 78.0°C, 79.0°C, 80.0°C, 81.0°C, 82.0°C, 83.0°C, 84.0°C or 85.0°C, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0016] In some optional embodiments, the pre-reaction liquid is kept at a constant temperature for 4-6 hours, for example, 4.0 hours, 4.2 hours, 4.4 hours, 4.6 hours, 4.8 hours, 5.0 hours, 5.2 hours, 5.4 hours, 5.6 hours, or 6.0 hours, but is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0017] In some optional embodiments, the volume ratio of the reaction solution A to deionized water is 1:4-5, for example, it can be 1:4, 1:4.1, 1:4.2, 1:4.3, 1:4.4, 1:4.5, 1:4.6, 1:4.7, 1:4.8, 1:4.9 or 1:5, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0018] In some alternative embodiments, the pretreatment precipitate is washed until the pH of the supernatant is 6.5-7.5, for example, 6.5, 6.6, 6.7, 6.8, 6.9, 7.0, 7.1, 7.2, 7.3, 7.4 or 7.5, but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0019] In some optional embodiments, the vacuum drying temperature is 70-80°C, for example, 70.0°C, 71.0°C, 72.0°C, 73.0°C, 74.0°C, 75.0°C, 76.0°C, 77.0°C, 78.0°C, 79.0°C, or 80.0°C, but is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0020] In some optional embodiments, the vacuum drying time is 10-12 hours, for example, it can be 10.0 hours, 10.2 hours, 10.4 hours, 10.6 hours, 10.8 hours, 11.0 hours, 11.2 hours, 11.4 hours, 11.6 hours, 11.8 hours or 12.0 hours, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0021] In some optional embodiments, the mass ratio of the aminated polyetheretherketone intermediate to maleic anhydride is 100:2.5-3.5, for example, it can be 100:2.5, 100:2.6, 100:2.7, 100:2.8, 100:2.9, 100:3.0, 100:3.1, 100:3.2, 100:3.3, 100:3.4 or 100:3.5, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0022] In some optional embodiments, the mass ratio of the amino-modified polyether ether ketone intermediate to the benzoyl peroxide initiator is 100:0.3-0.7, for example, it can be 100:0.3, 100:0.35, 100:0.4, 100:0.45, 100:0.5, 100:0.55, 100:0.6, 100:0.65 or 100:0.7, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0023] In some optional embodiments, the melting temperature of the reaction solution B is 275-285°C, for example, 275.0°C, 276.0°C, 277.0°C, 278.0°C, 279.0°C, 280.0°C, 281.0°C, 282.0°C, 283.0°C, 284.0°C, or 285.0°C, but is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0024] In some optional embodiments, the melting reaction time of the reaction solution B is 20-30 min, for example, it can be 20.0 min, 21.0 min, 22.0 min, 23.0 min, 24.0 min, 25.0 min, 26.0 min, 27.0 min, 28.0 min, 29.0 min or 30.0 min, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0025] In some optional embodiments, the nitrogen flow rate is 100-150 mL / min, for example, it can be 100.0 mL / min, 105.0 mL / min, 110.0 mL / min, 115.0 mL / min, 120.0 mL / min, 125.0 mL / min, 130.0 mL / min, 135.0 mL / min, 140.0 mL / min, 145.0 mL / min or 150.0 mL / min, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0026] As a preferred technical solution of the present invention, in step S2, the mass ratio of polyethersulfone to N-methylpyrrolidone is 1:10-15, for example, it can be 1:10, 1:10.5, 1:11, 1:11.5, 1:12, 1:12.5, 1:13, 1:13.5, 1:14, 1:14.5 or 1:15, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0027] In some alternative embodiments, the mass ratio of polyethersulfone to 4-aminobenzoic acid is 100:3.5-4.5, for example, it can be 100:3.5, 100:3.6, 100:3.7, 100:3.8, 100:3.9, 100:4.0, 100:4.1, 100:4.2, 100:4.3, 100:4.4 or 100:4.5, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0028] In some optional embodiments, the reaction temperature of the reaction solution C is 130-140°C, for example, it can be 130.0°C, 131.0°C, 132.0°C, 133.0°C, 134.0°C, 135.0°C, 136.0°C, 137.0°C, 138.0°C, 139.0°C or 140.0°C, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0029] In some optional embodiments, the reaction time of the reaction solution C is 4-6 hours, for example, 4.0 hours, 4.2 hours, 4.4 hours, 4.6 hours, 4.8 hours, 5.0 hours, 5.2 hours, 5.4 hours, 5.6 hours or 6.0 hours, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0030] In some optional embodiments, the temperature for vacuum drying of the pretreated polyethersulfone after washing is 60-70°C, for example, 60.0°C, 61.0°C, 62.0°C, 63.0°C, 64.0°C, 65.0°C, 66.0°C, 67.0°C, 68.0°C, 69.0°C, or 70.0°C, but is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0031] In some optional embodiments, the vacuum drying time after washing the pretreated polyethersulfone is 12-14 hours, for example, 12.0 hours, 12.2 hours, 12.4 hours, 12.6 hours, 12.8 hours, 13.0 hours, 13.2 hours, 13.4 hours, 13.6 hours, 13.8 hours, or 14.0 hours, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0032] In some optional embodiments, the mass ratio of the carboxylated polyethersulfone intermediate to glycidyl methacrylate is 100:3-4, for example, it can be 100:3.0, 100:3.1, 100:3.2, 100:3.6, 100:3.4, 100:3.5, 100:3.6, 100:3.7, 100:3.8, 100:3.9 or 100:4.0, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0033] In some optional embodiments, the temperature at which the carboxylated polyethersulfone intermediate is melt-mixed with glycidyl methacrylate is 235-245°C, for example, 235.0°C, 236.0°C, 237.0°C, 238.0°C, 239.0°C, 240.0°C, 241.0°C, 242.0°C, 243.0°C, 244.0°C, or 245.0°C, but is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0034] In some optional embodiments, the carboxylated polyethersulfone intermediate is melt-mixed with glycidyl methacrylate for 15-20 min, for example, 15.0 min, 15.5 min, 16.0 min, 16.5 min, 17.0 min, 17.5 min, 18.0 min, 18.5 min, 19.0 min, 19.5 min or 20.0 min, but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0035] As a preferred technical solution of the present invention, in step S3, the mass ratio of aluminum nitride to tetrahydrofuran is 1:10-15, for example, it can be 1:10, 1:10.5, 1:11, 1:11.5, 1:12, 1:12.5, 1:13, 1:13.5, 1:14, 1:14.5 or 1:15, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0036] In some optional embodiments, the mass ratio of aluminum nitride to dodecyl phosphate is 100:3-4, for example, it can be 100:3.0, 100:3.1, 100:3.2, 100:3.3, 100:3.4, 100:3.5, 100:3.6, 100:3.7, 100:3.8, 100:3.9 or 100:4.0, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0037] In some optional embodiments, the mass ratio of aluminum nitride to triethylamine is 100:0.5-1.5, for example, it can be 100:0.5, 100:0.6, 100:0.7, 100:0.8, 100:0.9, 100:1.0, 100:1.1, 100:1.2, 100:1.3, 100:1.4 or 100:1.5, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0038] In some optional embodiments, the reaction temperature of the reaction solution D is 60-70°C, for example, it can be 60.0°C, 61.0°C, 62.0°C, 63.0°C, 64.0°C, 65.0°C, 66.0°C, 67.0°C, 68.0°C, 69.0°C or 70.0°C, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0039] In some optional embodiments, the reaction time of the reaction solution D is 5-7 hours, for example, it can be 5.0 hours, 5.2 hours, 5.4 hours, 5.6 hours, 5.8 hours, 6.0 hours, 6.2 hours, 6.4 hours, 6.6 hours, 6.8 hours or 7.0 hours, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0040] In some alternative embodiments, the mass ratio of the first modified aluminum nitride to [BMIM]PF6 is 100:2-3, for example, it can be 100:2.0, 100:2.1, 100:2.2, 100:2.3, 100:2.4, 100:2.5, 100:2.6, 100:2.7, 100:2.8, 100:2.9 or 100:3.0, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0041] In some alternative embodiments, the concentration of the acetonitrile solution of the [BMIM]PF6 is 1-2%, for example, it can be 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9% or 2.0%, but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0042] In some optional embodiments, the power of the ultrasonic treatment of the reaction liquid E is 200-300W, for example, it can be 200W, 210W, 220W, 230W, 240W, 250W, 260W, 270W, 280W, 290W or 300W, but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0043] In some optional embodiments, the ultrasonic treatment time of the reaction solution E is 1-2 hours, for example, it can be 1.0h, 1.1h, 1.2h, 1.3h, 1.4h, 1.5h, 1.6h, 1.7h, 1.8h, 1.9h or 2.0h, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0044] In some optional embodiments, the vacuum drying temperature is 55-65°C, for example, 55.0°C, 56.0°C, 57.0°C, 58.0°C, 59.0°C, 60.0°C, 61.0°C, 62.0°C, 63.0°C, 64.0°C, or 65.0°C, but is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0045] In some optional embodiments, the vacuum drying time is 8-10 hours, for example, 8.0 hours, 8.2 hours, 8.4 hours, 8.6 hours, 8.8 hours, 9.0 hours, 9.2 hours, 9.4 hours, 9.6 hours, 9.8 hours, or 10.0 hours, but is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0046] As a preferred technical solution of the present invention, in step S4, the volume ratio of ethanol to water in the ethanol / water mixed solution is 9:1-7:3, for example, it can be 9:1, 8:2, 7:3, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0047] In some optional embodiments, the mass ratio of silicon carbide to the ethanol / water mixture is 1:10-15, for example, it can be 1:10.0, 1:10.5, 1:11.0, 1:11.5, 1:12.0, 1:12.5, 1:13.0, 1:13.5, 1:14.0, 1:14.5 or 1:15.0, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0048] In some optional embodiments, the mass ratio of polyvinylpyrrolidone to silicon carbide is 1-2:100, for example, it can be 1:100, 1.1:100, 1.2:100, 1.3:100, 1.4:100, 1.5:100, 1.6:100, 1.7:100, 1.8:100, 1.9:100, 2:100, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0049] In some optional embodiments, the ultrasonic power of the mixed solution is 300-400W, for example, it can be 300W, 310W, 320W, 330W, 340W, 350W, 360W, 370W, 380W, 390W or 400W, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0050] In some optional embodiments, the ultrasonic time of the mixed solution is 30-40 min, for example, it can be 30.0 min, 31.0 min, 32.0 min, 33.0 min, 34.0 min, 35.0 min, 36.0 min, 37.0 min, 38.0 min, 39.0 min or 40.0 min, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0051] In some optional embodiments, the mass ratio of KH550 to KH570 in the mixed coupling agent is 1-2:1, for example, it can be 1:1, 1.1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1 or 2:1, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0052] In some optional embodiments, the mass ratio of silicon carbide to the mixed coupling agent is 100:2-3, for example, it can be 100:2.0, 100:2.1, 100:2.2, 100:2.3, 100:2.4, 100:2.5, 100:2.6, 100:2.7, 100:2.8, 100:2.9 or 100:3.0, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0053] In some optional embodiments, the reflux temperature of the reaction solution F is 65-75°C, for example, it can be 65.0°C, 66.0°C, 67.0°C, 68.0°C, 69.0°C, 70.0°C, 71.0°C, 72.0°C, 73.0°C, 74.0°C or 75.0°C, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0054] In some optional embodiments, the reflux time of the reaction solution F is 5-7 hours, for example, 5.0 hours, 5.2 hours, 5.4 hours, 5.6 hours, 5.8 hours, 6.0 hours, 6.2 hours, 6.4 hours, 6.6 hours, 6.8 hours, or 7.0 hours, but is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0055] In some alternative embodiments, the concentration of the Tris buffer is 0.05-0.1M, for example, 0.05M, 0.055M, 0.06M, 0.065M, 0.07M, 0.075M, 0.08M, 0.085M, 0.09M, 0.095M or 0.1M, but is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0056] In some optional embodiments, the solid-liquid mass ratio of the first treated silicon carbide to the Tris buffer is 1:8-10, for example, it can be 1:8.0, 1:8.2, 1:8.4, 1:8.6, 1:8.8, 1:9.0, 1:9.2, 1:9.4, 1:9.6, 1:9.8 or 1:10.0, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0057] In some optional embodiments, the mass ratio of the first treated silicon carbide to dopamine hydrochloride is 100:1.5-2.5, for example, it can be 100:1.5, 100:1.6, 100:1.7, 100:1.8, 100:1.9, 100:2.0, 100:2.1, 100:2.2, 100:2.3, 100:2.4 or 100:2.5, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0058] In some optional embodiments, the stirring time at room temperature is 8-10 hours, for example, 8.0 hours, 8.2 hours, 8.4 hours, 8.6 hours, 8.8 hours, 9.0 hours, 9.2 hours, 9.4 hours, 9.6 hours, 9.8 hours, or 10.0 hours, but is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0059] In some optional embodiments, the vacuum drying temperature is 45-55°C, for example, 45.0°C, 46.0°C, 47.0°C, 48.0°C, 49.0°C, 50.0°C, 51.0°C, 52.0°C, 53.0°C, 54.0°C, or 55.0°C, but is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0060] In some optional embodiments, the vacuum drying time is 10-12 hours, for example, it can be 10.0 hours, 10.2 hours, 10.4 hours, 10.6 hours, 10.8 hours, 11.0 hours, 11.2 hours, 11.4 hours, 11.6 hours, 11.8 hours or 12.0 hours, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0061] As a preferred technical solution of the present invention, in step S5, the screw extrusion speed is 150-200 rpm, for example, it can be 150 rpm, 155 rpm, 160 rpm, 165 rpm, 170 rpm, 175 rpm, 180 rpm, 185 rpm, 190 rpm, 195 rpm or 200 rpm, but it is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0062] Secondly, the present invention provides a high-temperature resistant geotextile, which comprises the following components in parts by weight:

[0063]

[0064] In some optional embodiments, the amount of the modified polyetheretherketone is 65-70 parts, for example, 65 parts, 65.5 parts, 66 parts, 66.5 parts, 67 parts, 67.5 parts, 68 parts, 68.5 parts, 69 parts, 69.5 parts or 70 parts, but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0065] In some optional embodiments, the amount of the modified polyethersulfone is 25-30 parts, for example, 25 parts, 25.5 parts, 26 parts, 26.5 parts, 27 parts, 27.5 parts, 28 parts, 28.5 parts, 29 parts, 29.5 parts or 30 parts, but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0066] In some optional embodiments, the amount of modified aluminum nitride is 2-3 parts, for example, 2 parts, 2.1 parts, 2.2 parts, 2.3 parts, 2.4 parts, 2.5 parts, 2.6 parts, 2.7 parts, 2.8 parts, 2.9 parts or 3 parts, but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0067] In some optional embodiments, the amount of modified silicon carbide is 3-4 parts, for example, 3 parts, 3.1 parts, 3.2 parts, 3.3 parts, 3.4 parts, 3.5 parts, 3.6 parts, 3.7 parts, 3.8 parts, 3.9 parts or 4 parts, but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0068] In some optional embodiments, the amount of antioxidant used is 0.5-0.8 parts, for example, 0.5 parts, 0.55 parts, 0.6 parts, 0.65 parts, 0.7 parts, 0.75 parts or 0.8 parts, but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0069] This invention selects polyetheretherketone (PEEK) as the main material. PEEK is a semi-crystalline polymer with a high glass transition temperature and melting point. Its excellent thermal stability allows it to maintain its mechanical properties at high temperatures, ensuring that geotextiles are not prone to aging or failure in extreme environments. Secondly, PEEK has extremely strong resistance to chemical corrosion and can withstand the erosion of strong acids, strong alkalis, and organic solvents, which is crucial for the long-term use of geotextiles in harsh environments. In addition, it has a high modulus and excellent tensile strength while maintaining a certain degree of toughness. These characteristics make it suitable as a matrix material for geotextiles, providing reliable mechanical properties for the final product.

[0070] Polyetheretherketone (PEEK) was dispersed in concentrated sulfuric acid. The strong oxidizing and swelling properties of sulfuric acid pretreated the PEEK. Under the influence of concentrated sulfuric acid, the benzene ring structure of PEEK was activated, making the benzene ring more readily react with p-phenylenediamine. The introduction of amino groups significantly improved the chemical reactivity of PEEK, providing active sites for subsequent reactions with maleic anhydride.

[0071] The reaction between amino-modified polyether ether ketone and maleic anhydride introduces more polar groups through the acylation of maleic anhydride. Under the action of benzoyl peroxide initiator, amino-modified polyether ether ketone undergoes a grafting reaction with maleic anhydride to form modified polymer chains. This not only improves the heat resistance and antioxidant properties of polyether ether ketone, but also enhances the surface energy of the modified polyether ether ketone with the same polar groups, thus facilitating interfacial bonding with inorganic fillers or other polymers.

[0072] There is a synergistic effect between the two modification methods for polyether ether ketone: the amino group provides reactive sites, and maleic anhydride preferentially undergoes grafting reaction at the amino site, thereby forming a gradient distribution of polar groups, which improves the interfacial bonding strength and compatibility.

[0073] In this invention, polyethersulfone (PES) is used as another matrix material. PES is an amorphous polymer with a high glass transition temperature, enabling it to maintain excellent dimensional stability at high temperatures. Compared to polyetheretherketone (PEEK), PES has better flexibility, providing geotextiles with a certain degree of plasticity and fracture resistance. Its flexibility also makes the modified composite material more suitable for melt spinning processes, and the fibers are less prone to breakage during molding and needle-punching. Furthermore, PES has excellent antioxidant properties; its molecular chain structure remains very stable when exposed to oxidizing atmospheres or ultraviolet light, exhibiting good weather resistance and increasing the service life of geotextiles outdoors.

[0074] In this invention, polyethersulfone (PES) is modified by introducing 4-aminobenzoic acid to transform it into a carboxylated PES intermediate, thereby enhancing its reactivity and polarity. The amino group in 4-aminobenzoic acid reacts with PES to form an amide structure, while the carboxyl group enhances the polarity and interfacial compatibility of PES through hydrogen or ionic bonds. Carboxylation also enhances the hydrophilicity of PES and its interfacial bonding ability with inorganic fillers.

[0075] Secondly, carboxylated polyethersulfone is reacted with glycidyl methacrylate to introduce ether bonds or hydroxyl groups through the ring-opening reaction of epoxy groups, thereby further improving the crosslinking density and functionalization degree of polyethersulfone: under molten conditions, carboxylated polyethersulfone undergoes a ring-opening esterification reaction with glycidyl methacrylate to generate a crosslinked structure, increasing the intermolecular bonding force, which further improves the heat resistance of modified polyethersulfone and also enhances the flexibility of polyethersulfone.

[0076] The carboxyl and epoxy groups introduced through two modification methods of polyethersulfone form a complementary network, providing a multi-level cross-linked structure that effectively enhances the toughness of the matrix and the interfacial bonding ability.

[0077] There is a synergistic reinforcing effect between polyetheretherketone (PEEK) and polyethersulfone (PES): PEEK has higher heat resistance, while PES provides flexibility and a lower processing temperature. The combination of the two can improve the processing performance and flexibility of the material while ensuring high-temperature resistance. PEEK provides higher modulus and strength, while PES increases the toughness and fracture resistance of the composite material, resulting in a geotextile that is both high-strength and resistant to breakage in practical applications. Furthermore, both PEEK and PES, after modification, can introduce polar groups, forming a good interfacial bond with functionalized fillers, effectively improving the thermal conductivity and strength of the composite material. The amino-maleic anhydride structure of PEEK interpenetrates with the carboxyl-epoxy network of PEEK, forming an interpenetrating network structure that improves the matrix toughness and thermal stability. PEEK has stronger chemical stability, while PES complements its flexibility and oxidation resistance, resulting in a composite material exhibiting higher durability under various chemical environments.

[0078] This invention selects aluminum nitride as one of the fillers. Aluminum nitride has a high thermal conductivity, ranking among the best in common fillers, enabling effective heat transfer and dissipation. This makes it ideal for use in composite materials requiring high thermal conductivity. Geotextiles in high-temperature industrial environments may require rapid heat dissipation to avoid performance degradation caused by localized overheating. The high thermal conductivity of aluminum nitride can significantly improve the thermal management performance of composite materials.

[0079] Although aluminum nitride has high thermal conductivity, it also has extremely high resistivity, making it an excellent thermal conductor and electrical insulator. Furthermore, aluminum nitride has a high decomposition temperature and exhibits good thermal and chemical stability at high temperatures, making it suitable for geotextiles used in high-temperature environments. In addition, aluminum nitride is non-toxic and non-polluting, making it environmentally friendly in processing and practical use.

[0080] Dodecyl phosphate can be used to modify the surface of aluminum nitride, transforming it from hydrophilic to hydrophobic. Dodecyl phosphate molecules chemically adsorb onto the aluminum nitride surface through their phosphate groups, forming covalent or ionic bonds, while the long-chain alkyl portion provides hydrophobicity, thus improving its dispersibility with the polymer matrix. Further modification of the aluminum nitride surface with [BMIM]PF6 provides stable interfacial interactions. Ionic liquids uniformly cover the aluminum nitride surface through physical adsorption or chemical bonding, reducing particle aggregation and providing a certain degree of lubrication. This improves the dispersion stability of aluminum nitride, allowing the modified aluminum nitride to fully utilize its thermal conductivity in the matrix. Phosphate provides strongly polar binding sites, while the ionic liquid forms a thermally conductive network on the phosphate layer, resulting in an ordered interfacial layer and improved thermal conductivity.

[0081] In this invention, silicon carbide is selected as another filler. Silicon carbide is an ultra-high temperature ceramic material that can maintain structural stability and provide strength under extreme high temperature environments. Secondly, silicon carbide has extremely high hardness, as well as high strength and high modulus, making it an ideal reinforcing filler. Silicon carbide exhibits extremely strong chemical stability in most acidic, alkaline, and oxidizing environments, especially under high temperature or extreme chemical conditions, which can extend the service life of the composite material. In addition, the high thermal conductivity of silicon carbide can improve the thermal conductivity of the composite material, while its coefficient of thermal expansion is very low, matching that of polyetheretherketone and polyethersulfone, which can effectively reduce the thermal stress of the composite material in high temperature environments. Furthermore, silicon carbide can form a dense protective film in a zinc oxide environment, thereby improving its oxidation resistance.

[0082] The surface of silicon carbide is treated with a silane coupling agent. The silane groups in the coupling agent react with the hydroxyl groups on the silicon carbide surface to form Si-O-Si bonds. The organic end of the coupling agent forms an interface with the matrix, thereby improving the interfacial bonding between silicon carbide and the organic matrix material. The dispersibility of silicon carbide particles and the interfacial bonding force with the matrix are enhanced. The modified silicon carbide can more effectively improve the strength and heat resistance of the composite material.

[0083] Simultaneously, dopamine is used to modify the surface-modified silicon carbide: dopamine undergoes a self-polymerization reaction under alkaline conditions, and its catechol and amino groups form hydrogen bonds or covalent bonds with the silicon carbide surface, generating a stable coating. Utilizing the polymerization ability of dopamine, a polydopamine coating is formed on the surface of the surface-modified silicon carbide, thereby enhancing the functionalization of the silicon carbide. Silane groups provide chemical bonding sites, and polydopamine forms secondary structures on the silane layer, thus constructing a multi-level interfacial structure and enhancing its interfacial bonding ability.

[0084] There is also a synergistic reinforcing effect between aluminum nitride and silicon carbide: the high thermal conductivity of both aluminum nitride and silicon carbide significantly improves the overall thermal conductivity of the composite material, and the dopamine layer of modified silicon carbide and the ionic liquid layer of aluminum nitride can form a thermally conductive channel, further improving its thermal conductivity efficiency. Aluminum nitride provides high heat dissipation capacity, while silicon carbide supplements thermal conductivity and provides thermal expansion matching; in terms of mechanical properties, aluminum nitride enhances the rigidity and dimensional stability of the composite material, while silicon carbide improves wear resistance and impact resistance, and the two together improve the comprehensive mechanical properties of the composite material; at the same time, both aluminum nitride and silicon carbide have extremely high heat resistance and can work synergistically in high-temperature environments to prevent the composite material from failing due to thermal degradation or thermal expansion; surface-modified aluminum nitride and silicon carbide can form strong interfacial bonds with the matrix, ensuring uniform distribution of fillers and avoiding agglomeration, thereby improving the processing performance and final performance of the composite material.

[0085] The modified polymer and functionalized filler are uniformly mixed and then extruded and spun to form a composite material. During the extrusion process, the polar groups of the modified polymer and the surface groups of the inorganic filler are combined through hydrogen bonds or chemical bonds to form a uniform composite structure, which provides a good mixing effect and ensures the dispersion of the filler in the matrix.

[0086] The modified polymer is stretched into fibers at high temperature by melt spinning, which provides excellent mechanical properties and high temperature resistance. Needle punching and consolidation enhance the mechanical bonding between fibers, improving the tensile strength and dimensional stability of the geotextile. The melt spinning and needle punching and consolidation processes form a structurally stable fiber web.

[0087] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0088] (1) By amylating polyether ether ketone with p-phenylenediamine, active sites for subsequent reactions are provided. Maleic anhydride is grafted at the amino sites to form a gradient distribution of polar groups, which improves the interfacial bonding strength and compatibility. At the same time, carboxyl and epoxy groups are introduced to modify polyether sulfone. The carboxyl and epoxy groups form a complementary network, thereby providing a multi-level cross-linked structure and enhancing the toughness and interfacial bonding ability of the matrix.

[0089] (2) Phosphate provides strong polar binding sites on the surface of aluminum nitride, while ionic liquid forms a thermally conductive network on the phosphate layer, forming an ordered interface layer and improving thermal conductivity; silane groups introduced on the surface of silicon carbide provide chemical bonding sites, while dopamine forms a secondary structure on the silane layer. The two construct a multi-level interface structure, enhancing its interface bonding ability.

[0090] (3) The amino-maleic anhydride structure of polyetheretherketone and the carboxyl-epoxy group of polyethersulfone interpenetrate to form an interpenetrating network structure, which improves the toughness and thermal stability of the matrix; the ionic liquid layer of aluminum nitride and the dopamine layer of silicon carbide form a thermally conductive channel, making the interface structure more multi-layered and the stress transmission more uniform; while the polar groups of the matrix and the filler surface form multiple forces, making the interface structure more robust. Attached Figure Description

[0091] Figure 1 This is a flowchart of the preparation method of the high-temperature resistant geotextile provided in Embodiment 1 of the present invention;

[0092] Figure 2 This is a scanning electron microscope image of the spinning process provided in Embodiment 1 of the present invention. Detailed Implementation

[0093] The technical solutions of the present invention will be described in detail below with reference to specific embodiments and accompanying drawings. The embodiments described herein are specific implementations of the present invention, used to illustrate the concept of the present invention; these descriptions are explanatory and exemplary, and should not be construed as limiting the implementation methods or the scope of protection of the present invention. In addition to the embodiments described herein, those skilled in the art can employ other obvious technical solutions based on the content disclosed in the claims and specification of this application. These technical solutions include those that make any obvious substitutions and modifications to the embodiments described herein.

[0094] The chemical reagents used in the embodiments and comparative examples of this invention are all commercially available products.

[0095] Example 1

[0096] like Figure 1 As shown, this embodiment provides a high-temperature resistant geotextile and its preparation method, wherein the high-temperature resistant geotextile comprises the following components in parts by weight:

[0097]

[0098] The preparation method specifically includes the following steps:

[0099] S1: Polyetheretherketone (PEEK) was dispersed in concentrated sulfuric acid to obtain a PEEK dispersion, wherein the mass ratio of PEEK to concentrated sulfuric acid was 1:17. After stirring, p-phenylenediamine was added at a mass ratio of 3.8:100 to PEEK to obtain a pre-reaction solution. After reacting at a constant temperature of 80℃ for 5 hours, reaction solution A was obtained. This solution was then poured into deionized water and stirred to obtain a pretreated precipitate, wherein the volume ratio of reaction solution A to deionized water was 1:4.5. The solution was filtered and washed until the pH of the supernatant was 7, and then vacuum dried at 70℃. Aminated polyether ether ketone intermediate was obtained after 12 hours. The aminated polyether ether ketone intermediate was mixed with maleic anhydride and benzoyl peroxide initiator to obtain reaction solution B, wherein the mass ratio of aminated polyether ether ketone intermediate to maleic anhydride was 100:3 and the mass ratio of aminated polyether ether ketone intermediate to benzoyl peroxide initiator was 100:0.5. The reaction was carried out at 280℃ for 25 minutes under nitrogen protection at a flow rate of 125 mL / min, and the mixture was cooled and granulated to obtain modified polyether ether ketone.

[0100] S2: Polyethersulfone and N-methylpyrrolidone were mixed at a mass ratio of 1:10, and 4-aminobenzoic acid was added to obtain reaction solution C, wherein the mass ratio of polyethersulfone to 4-aminobenzoic acid was 100:4. After stirring, the mixture was poured into deionized water, wherein the stirring temperature was 138℃ and the time was 5h. The mixture was filtered to obtain pretreated polyethersulfone, washed, and vacuum dried at 65℃ for 13h to obtain carboxylated polyethersulfone intermediate. The carboxylated polyethersulfone intermediate and glycidyl methacrylate were melt-mixed under a nitrogen atmosphere, wherein the mass ratio of carboxylated polyethersulfone intermediate to glycidyl methacrylate was 100:3.8, the melting temperature was 235℃ and the time was 18min, and the mixture was cooled and granulated to obtain modified polyethersulfone.

[0101] S3: Aluminum nitride and tetrahydrofuran were mixed at a mass ratio of 1:12, and dodecyl phosphate and triethylamine were added to obtain reaction solution D, wherein the mass ratio of aluminum nitride to dodecyl phosphate was 100:3 and the mass ratio of aluminum nitride to triethylamine was 100:1. The mixture was stirred at 68°C for 6 hours, and centrifuged to obtain the first modified aluminum nitride. The first modified aluminum nitride was dispersed in an acetonitrile solution of 1.5% [BMIM]PF6 to obtain reaction solution E, wherein the mass ratio of the first modified aluminum nitride to [BMIM]PF6 was 100:3. The mixture was ultrasonically treated at 260W for 1 hour and then vacuum dried at 60°C for 9 hours to obtain the modified aluminum nitride.

[0102] S4: Silicon carbide powder was mixed with an ethanol / water mixture at a volume ratio of 7:3, wherein the mass ratio of silicon carbide to the ethanol / water mixture was 1:13. Polyvinylpyrrolidone was added at a mass ratio of 1.5:100 to silicon carbide to obtain a mixed solution. After ultrasonic dispersion at 350W for 30 min, a mixed coupling agent was added to obtain reaction solution F, wherein the mass ratio of KH550 to KH570 in the mixed coupling agent was 2:1, and the mass ratio of silicon carbide to the mixed coupling agent was 100:2.5. After centrifugation at 70℃ for 6 h, the first-treated silicon carbide was obtained. It was dispersed in a 0.07M Tris buffer solution, wherein the solid-liquid mass ratio of the first-treated silicon carbide to the Tris buffer solution was 1:10. Dopamine hydrochloride was added, wherein the mass ratio of the first-treated silicon carbide to dopamine hydrochloride was 100:2. The mixture was stirred at room temperature for 9 h, filtered, washed, and vacuum dried at 50℃ for 11 h to obtain modified silicon carbide.

[0103] S5: Modified polyetheretherketone, modified polyethersulfone, and antioxidant 1010 are added to a high-speed mixer and mixed. Modified silicon carbide and modified aluminum nitride are added and mixed to obtain a mixture. The mixture is then fed into a twin-screw extruder and extruded. The screw speed of the twin-screw extruder is 180 prm. The extrudate is collected and melt-spun. The spinneret orifice diameter is 0.3 mm and the nozzle draw ratio is 4.0. The resulting spun yarn is laid flat on the mesh screen of a web forming machine and consolidated by a needle punch to obtain a rough geotextile. After the tension is adjusted by a tension frame, the yarn enters a winding machine for edge trimming and winding to obtain a high-temperature resistant geotextile. Figure 2 The scanning electron microscope image of the spun fibers shows that the fibers exhibit an interwoven and continuous structure, with no obvious phase separation or agglomeration of inorganic fillers.

[0104] Example 2

[0105] This embodiment provides a high-temperature resistant geotextile and its preparation method, wherein the high-temperature resistant geotextile comprises the following components in parts by weight:

[0106]

[0107] The preparation method specifically includes the following steps:

[0108] S1: Polyetheretherketone (PEEK) was dispersed in concentrated sulfuric acid to obtain a PEEK dispersion, wherein the mass ratio of PEEK to concentrated sulfuric acid was 1:15. After stirring, p-phenylenediamine was added at a mass ratio of 4:100 to PEEK to obtain a pre-reaction solution. After reacting at a constant temperature of 75℃ for 4 hours, reaction solution A was obtained. This solution was then poured into deionized water and stirred to obtain a pretreated precipitate, wherein the volume ratio of reaction solution A to deionized water was 1:4. The solution was filtered and washed until the pH of the supernatant was 7.2, and then vacuum dried at 80℃ for 10 minutes. h yielded an aminolated polyether ether ketone intermediate; the aminolated polyether ether ketone intermediate was mixed with maleic anhydride and benzoyl peroxide initiator to obtain reaction solution B, wherein the mass ratio of aminolated polyether ether ketone intermediate to maleic anhydride was 100:3.5 and the mass ratio of aminolated polyether ether ketone intermediate to benzoyl peroxide initiator was 100:0.3. The mixture was melted and reacted at 275°C for 30 min under nitrogen protection at a flow rate of 100 mL / min, and then cooled and granulated to obtain modified polyether ether ketone.

[0109] S2: Polyethersulfone and N-methylpyrrolidone were mixed at a mass ratio of 1:12.5, and 4-aminobenzoic acid was added to obtain reaction solution C, wherein the mass ratio of polyethersulfone to 4-aminobenzoic acid was 100:4.5. After stirring, the mixture was poured into deionized water, wherein the stirring temperature was 135℃ and the stirring time was 4h. The mixture was filtered to obtain pretreated polyethersulfone, washed, and vacuum dried at 70℃ for 12h to obtain carboxylated polyethersulfone intermediate. The carboxylated polyethersulfone intermediate and glycidyl methacrylate were melt-mixed under a nitrogen atmosphere, wherein the mass ratio of carboxylated polyethersulfone intermediate to glycidyl methacrylate was 100:3.5, the melting temperature was 245℃ and the melting time was 15min. The mixture was cooled and granulated to obtain modified polyethersulfone.

[0110] S3: Aluminum nitride and tetrahydrofuran were mixed at a mass ratio of 1:12, and dodecyl phosphate and triethylamine were added to obtain reaction solution D, wherein the mass ratio of aluminum nitride to dodecyl phosphate was 100:3.5 and the mass ratio of aluminum nitride to triethylamine was 100:0.5. The mixture was stirred at 70°C for 5 hours, and centrifuged to obtain the first modified aluminum nitride. The first modified aluminum nitride was dispersed in an acetonitrile solution of 2% [BMIM]PF6 to obtain reaction solution E, wherein the mass ratio of the first modified aluminum nitride to [BMIM]PF6 was 100:2.3. The mixture was ultrasonically treated at 280W for 1.5 hours and then vacuum dried at 65°C for 8 hours to obtain the modified aluminum nitride.

[0111] S4: Silicon carbide powder was mixed with an ethanol / water mixture at a volume ratio of 8:2, wherein the mass ratio of silicon carbide to the ethanol / water mixture was 1:15. Polyvinylpyrrolidone at a mass ratio of 1:100 to silicon carbide was added to obtain a mixed solution. After ultrasonic dispersion at 380W for 35 min, a mixed coupling agent was added to obtain reaction solution F, wherein the mass ratio of KH550 to KH570 in the mixed coupling agent was 1:1, and the mass ratio of silicon carbide to the mixed coupling agent was 100:3. After reflux at 75℃ for 5 h and centrifugation, the first-treated silicon carbide was obtained. It was dispersed in a 0.05M Tris buffer solution, wherein the solid-liquid mass ratio of the first-treated silicon carbide to the Tris buffer solution was 1:8. Dopamine hydrochloride was added, wherein the mass ratio of the first-treated silicon carbide to dopamine hydrochloride was 100:2.5. The mixture was stirred at room temperature for 8 h, filtered, washed, and vacuum dried at 55℃ for 10 h to obtain modified silicon carbide.

[0112] S5: Modified polyetheretherketone, modified polyethersulfone, and antioxidant 1076 are added to a high-speed mixer and mixed. Modified silicon carbide and modified aluminum nitride are added and mixed to obtain a mixture. The mixture is then fed into a twin-screw extruder and extruded. The screw speed of the twin-screw extruder is 170 prm. The extrudate is collected and melt-spun. The spinneret orifice diameter is 0.2 mm and the nozzle draw ratio is 4.2. The resulting spun yarn is laid flat on the mesh screen of a web forming machine and consolidated by a needle punch to obtain a rough geotextile. After the tension is adjusted by a tension frame, the yarn enters a winding machine for edge trimming and winding to obtain a high-temperature resistant geotextile.

[0113] Example 3

[0114] This embodiment provides a high-temperature resistant geotextile and its preparation method, wherein the high-temperature resistant geotextile comprises the following components in parts by weight:

[0115]

[0116] The preparation method specifically includes the following steps:

[0117] S1: Polyetheretherketone (PEEK) was dispersed in concentrated sulfuric acid to obtain a PEEK dispersion, wherein the mass ratio of PEEK to concentrated sulfuric acid was 1:20. After stirring, p-phenylenediamine with a mass ratio of 3:100 to PEEK was added to obtain a pre-reaction solution. After reacting at a constant temperature of 82℃ for 6 hours, reaction solution A was obtained. This solution was poured into deionized water and stirred to obtain a pretreated precipitate, wherein the volume ratio of reaction solution A to deionized water was 1:5. The solution was filtered and washed until the pH of the supernatant was 6.5, and then vacuum dried at 75℃ for 11 minutes. h yielded an aminolated polyether ether ketone intermediate; the aminolated polyether ether ketone intermediate was mixed with maleic anhydride and benzoyl peroxide initiator to obtain reaction solution B, wherein the mass ratio of aminolated polyether ether ketone intermediate to maleic anhydride was 100:2.5 and the mass ratio of aminolated polyether ether ketone intermediate to benzoyl peroxide initiator was 100:0.7. The mixture was melted and reacted at 282℃ for 20 min under nitrogen protection at a flow rate of 150 mL / min, and then cooled and granulated to obtain modified polyether ether ketone.

[0118] S2: Polyethersulfone and N-methylpyrrolidone were mixed at a mass ratio of 1:14, and 4-aminobenzoic acid was added to obtain reaction solution C, wherein the mass ratio of polyethersulfone to 4-aminobenzoic acid was 100:4.2. After stirring, the mixture was poured into deionized water, wherein the stirring temperature was 130℃ and the stirring time was 6h. The mixture was filtered to obtain pretreated polyethersulfone, and after washing, it was vacuum dried at 68℃ for 13.5h to obtain carboxylated polyethersulfone intermediate. The carboxylated polyethersulfone intermediate and glycidyl methacrylate were melt-mixed under a nitrogen atmosphere, wherein the mass ratio of carboxylated polyethersulfone intermediate to glycidyl methacrylate was 100:4, the melting temperature was 240℃ and the melting time was 17min, and the mixture was cooled and granulated to obtain modified polyethersulfone.

[0119] S3: Aluminum nitride and tetrahydrofuran were mixed at a mass ratio of 1:12, and dodecyl phosphate and triethylamine were added to obtain reaction solution D, wherein the mass ratio of aluminum nitride to dodecyl phosphate was 100:4 and the mass ratio of aluminum nitride to triethylamine was 100:1.5. The mixture was stirred at 65°C for 7 hours, and centrifuged to obtain the first modified aluminum nitride. The first modified aluminum nitride was dispersed in an acetonitrile solution of 1% [BMIM]PF6 to obtain reaction solution E, wherein the mass ratio of the first modified aluminum nitride to [BMIM]PF6 was 100:2. The mixture was ultrasonically treated at 200W for 1.8 hours and then vacuum dried at 63°C for 10 hours to obtain the modified aluminum nitride.

[0120] S4: Silicon carbide powder is mixed with an ethanol / water mixture at a volume ratio of 9:1, where the mass ratio of silicon carbide to the ethanol / water mixture is 1:10. Polyvinylpyrrolidone (PVP) at a mass ratio of 1.8:100 to silicon carbide is added to obtain a mixed solution. After ultrasonic dispersion at 300W for 40 minutes, a mixed coupling agent is added to obtain reaction solution F. The mass ratio of KH550 to KH570 in the mixed coupling agent is 1.5:1, and the mass ratio of silicon carbide to the mixed coupling agent is... The mass ratio was 100:2.8. After reflux at 65℃ for 7 h and centrifugation, the first-treated silicon carbide was obtained. It was dispersed in 0.09M Tris buffer, where the solid-liquid mass ratio of the first-treated silicon carbide to the Tris buffer was 1:9. Dopamine hydrochloride was added, where the mass ratio of the first-treated silicon carbide to the dopamine hydrochloride was 100:1.5. The mixture was stirred at room temperature for 9.2 h, filtered, washed, and vacuum dried at 52℃ for 12 h to obtain modified silicon carbide.

[0121] S5: Modified polyetheretherketone, modified polyethersulfone, and antioxidant 1076 are added to a high-speed mixer and mixed. Modified silicon carbide and modified aluminum nitride are added and mixed to obtain a mixture. The mixture is then fed into a twin-screw extruder for extrusion. The screw speed of the twin-screw extruder is 180 prm, 170 prm, 150 prm, and 200 prm. The extrudate is collected and melt-spun. The spinneret orifice diameter is 0.3 mm, 0.2 mm, 0.4 mm, and 0.32 mm, and the nozzle draw ratio is 4.0, 4.2, 3.8, and 4.1. The resulting spun yarn is laid flat on the mesh screen of a web forming machine and consolidated by a needle punch to obtain a rough geotextile. After the tension is adjusted by a tension frame, the yarn enters a winding machine for edge trimming and winding to obtain a high-temperature resistant geotextile.

[0122] Example 4

[0123] This embodiment provides a high-temperature resistant geotextile and its preparation method, wherein the high-temperature resistant geotextile comprises the following components in parts by weight:

[0124]

[0125] The preparation method specifically includes the following steps:

[0126] S1: Polyetheretherketone (PEEK) was dispersed in concentrated sulfuric acid to obtain a PEEK dispersion, wherein the mass ratio of PEEK to concentrated sulfuric acid was 1:19. After stirring, p-phenylenediamine was added at a mass ratio of 3.5:100 to PEEK to obtain a pre-reaction solution. After reacting at a constant temperature of 85℃ for 5.4 h, reaction solution A was obtained. This solution was poured into deionized water and stirred to obtain a pretreated precipitate, wherein the volume ratio of reaction solution A to deionized water was 1:4.8. The solution was filtered and washed until the pH of the supernatant was 7.5, and then vacuum dried at 77℃. Aminated polyether ether ketone intermediate was obtained after 11.6 h. The aminated polyether ether ketone intermediate was mixed with maleic anhydride and benzoyl peroxide initiator to obtain reaction solution B, wherein the mass ratio of aminated polyether ether ketone intermediate to maleic anhydride was 100:3.2 and the mass ratio of aminated polyether ether ketone intermediate to benzoyl peroxide initiator was 100:0.6. The reaction was carried out at 285 °C for 28 min under nitrogen protection at a flow rate of 140 mL / min. After cooling and granulation, modified polyether ether ketone was obtained.

[0127] S2: Polyethersulfone and N-methylpyrrolidone were mixed at a mass ratio of 1:15, and 4-aminobenzoic acid was added to obtain reaction solution C, wherein the mass ratio of polyethersulfone to 4-aminobenzoic acid was 100:3.5. After stirring, the mixture was poured into deionized water, wherein the stirring temperature was 140℃ and the time was 5.5h. The mixture was filtered to obtain pretreated polyethersulfone, washed, and vacuum dried at 60℃ for 14h to obtain carboxylated polyethersulfone intermediate. The carboxylated polyethersulfone intermediate and glycidyl methacrylate were melt-mixed under a nitrogen atmosphere, wherein the mass ratio of carboxylated polyethersulfone intermediate to glycidyl methacrylate was 100:3, the melting temperature was 243℃ and the time was 16min. After cooling and granulation, modified polyethersulfone was obtained.

[0128] S3: Aluminum nitride and tetrahydrofuran were mixed at a mass ratio of 1:12, and dodecyl phosphate and triethylamine were added to obtain reaction solution D, wherein the mass ratio of aluminum nitride to dodecyl phosphate was 100:3.8 and the mass ratio of aluminum nitride to triethylamine was 100:1.2. The mixture was stirred at 60°C for 6.2 h, and centrifuged to obtain the first modified aluminum nitride. The first modified aluminum nitride was dispersed in an acetonitrile solution of 1.7% [BMIM]PF6 to obtain reaction solution E, wherein the mass ratio of the first modified aluminum nitride to [BMIM]PF6 was 100:2.7. The mixture was ultrasonically treated at 300W for 2 h and then vacuum dried at 55°C for 9.4 h to obtain the modified aluminum nitride.

[0129] S4: Silicon carbide powder was mixed with ethanol / water solutions of volume ratios of 7:3, 8:2, 9:1, and 8:2, where the mass ratio of silicon carbide to ethanol / water solutions was 1:14. Polyvinylpyrrolidone (PVP) with a mass ratio of 2:100 to silicon carbide was added to obtain a mixed solution. After ultrasonic dispersion at 400W for 37 minutes, a mixed coupling agent was added to obtain reaction solution F. The mass ratio of KH550 to KH570 in the mixed coupling agent was 1.8:1. The coupling agent was refluxed at 73°C for 6.4 h and centrifuged to obtain the first-treated silicon carbide. It was dispersed in 0.1 M Tris buffer, where the solid-liquid mass ratio of the first-treated silicon carbide to the Tris buffer was 1:9.2. Dopamine hydrochloride was added, where the mass ratio of the first-treated silicon carbide to the dopamine hydrochloride was 100:2.2. The mixture was stirred at room temperature for 10 h, filtered, washed, and vacuum dried at 45°C for 11.6 h to obtain the modified silicon carbide.

[0130] S5: Modified polyetheretherketone, modified polyethersulfone, and antioxidant 1010 are added to a high-speed mixer and mixed. Modified silicon carbide and modified aluminum nitride are added and mixed to obtain a mixture. The mixture is then fed into a twin-screw extruder and extruded. The screw speed of the twin-screw extruder is 200 prm. The extrudate is collected and melt-spun. The spinneret orifice diameter is 0.32 mm and the nozzle draw ratio is 4.1. The resulting spun yarn is laid flat on the mesh screen of a web forming machine and consolidated by a needle punch to obtain a rough geotextile. After the tension is adjusted by a tension frame, the yarn enters a winding machine for edge trimming and winding to obtain a high-temperature resistant geotextile.

[0131] Comparative Example 1

[0132] This comparative example provides a high-temperature resistant geotextile. The difference from Example 1 is that in step S1, the mass ratio of p-phenylenediamine to polyetheretherketone is adjusted to 7:100. Other operating steps and process parameters are exactly the same as in Example 1.

[0133] Comparative Example 2

[0134] This comparative example provides a high-temperature resistant geotextile. The difference from Example 1 is that in step S1, the mass ratio of p-phenylenediamine to polyetheretherketone is adjusted to 1:100. Other operating steps and process parameters are exactly the same as in Example 1.

[0135] Comparative Example 3

[0136] This comparative example provides a high-temperature resistant geotextile. The difference from Example 1 is that in step S2, the mass ratio of polyethersulfone to 4-aminobenzoic acid is adjusted to 100:9. Other operating steps and process parameters are exactly the same as in Example 1.

[0137] Comparative Example 4

[0138] This comparative example provides a high-temperature resistant geotextile. The difference from Example 1 is that in step S2, the mass ratio of polyethersulfone to 4-aminobenzoic acid is adjusted to 100:1. Other operating steps and process parameters are exactly the same as in Example 1.

[0139] Comparative Example 5

[0140] This comparative example provides a high-temperature resistant geotextile. The difference from Example 1 is that in step S5, the mass fraction of modified aluminum nitride is adjusted to 10 parts, while the other operating steps and process parameters are exactly the same as in Example 1.

[0141] Comparative Example 6

[0142] This comparative example provides a high-temperature resistant geotextile. The difference from Example 1 is that in step S5, the mass fraction of modified aluminum nitride is adjusted to 1 part, while other operating steps and process parameters are exactly the same as in Example 1.

[0143] Comparative Example 7

[0144] This comparative example provides a high-temperature resistant geotextile. The difference from Example 1 is that in step S5, the mass fraction of modified silicon carbide is adjusted to 8 parts, while other operating steps and process parameters are exactly the same as in Example 1.

[0145] Comparative Example 8

[0146] This comparative example provides a high-temperature resistant geotextile. The difference from Example 1 is that in step S5, the mass fraction of modified aluminum nitride is adjusted to 1 part, while other operating steps and process parameters are exactly the same as in Example 1.

[0147] The performance of the high-temperature resistant geotextiles of Examples 1-4 and Comparative Examples 1-8 was tested, and the specific process is as follows:

[0148] The tear strength of the test sample was determined according to GB / T 13763-2010.

[0149] The bursting strength of the CBR test sample was determined according to GB / T 14800-2010.

[0150] The high-temperature resistant geotextiles of Examples 1-4 and Comparative Examples 1-8 were placed in an oven at 200°C for 6 hours and then taken out to test their tear strength and CBR bursting strength.

[0151] The test results are shown in Table 1.

[0152] Table 1: Test results of high-temperature resistant geotextiles in Examples 1-4 and Comparative Examples 1-8

[0153]

[0154] As shown in Table 1, the high-temperature resistant geotextiles prepared in Examples 1-4 of the present invention have good high-temperature resistance and mechanical properties.

[0155] The test results of Example 1 and Comparative Examples 1 and 2 show that when the content of p-phenylenediamine is too high, excessive cross-linking leads to restricted chain segment movement, decreased processing performance, brittle fibers, and decreased mechanical properties of the resulting geotextile. When the content is too low, the degree of amination on polyetheretherketone is low, the number of active sites is insufficient, the subsequent maleic anhydride grafting rate is low, resulting in insufficient bonding with fillers, easy interfacial delamination, and decreased heat resistance.

[0156] The test results of Example 1 and Comparative Examples 3 and 4 show that when the amount of 4-aminobenzoic acid added is too high, the over-substitution of sulfone groups leads to the breakage of the main chain, resulting in a decrease in mechanical properties and thermal stability. When the amount of 4-aminobenzoic acid added is too low, the degree of carboxylation of polyethersulfone is insufficient, which is not conducive to the subsequent reaction with epoxy groups. This results in a small number of polar groups, weak interfacial bonding with inorganic fillers, and easy local deformation under high temperature environment, thus reducing service life.

[0157] The test results of Example 1 and Comparative Examples 5-8 show that adding appropriate amounts of modified aluminum nitride and modified silicon carbide can achieve the desired effect. However, when the amount of both is too high, they are prone to uneven dispersion, causing agglomeration and stress concentration points, which can also reduce spinning performance, clog the spinneret, and reduce the flexibility of the material. When the amount of both is too low, the thermal conductivity and reinforcing effect of the material are not obvious, and the heat resistance is insufficient.

[0158] The above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A method for producing a high-temperature-resistant geotextile, characterized by, The preparation method comprises: S1: dispersing polyether ether ketone in concentrated sulfuric acid to obtain a polyether ether ketone dispersion, stirring, adding p-phenylenediamine to obtain a pre-reaction solution, obtaining reaction solution A after constant temperature reaction, pouring into deionized water to obtain a pretreated precipitate after stirring, filtering, washing, and vacuum drying to obtain an aminated polyether ether ketone intermediate; mixing the aminated polyether ether ketone intermediate with maleic anhydride and a dibenzoyl peroxide initiator to obtain reaction solution B, melt-reaction under nitrogen protection, cooling and granulating to obtain modified polyether ether ketone; S2: mixing polyether sulfone and N-methyl pyrrolidone, adding 4-aminobenzoic acid to obtain reaction solution C, stirring and reaction, pouring into deionized water, filtering to obtain pretreated polyether sulfone, washing and vacuum drying to obtain a carboxylated polyether sulfone intermediate; melt-mixing the carboxylated polyether sulfone intermediate with glycidyl methacrylate under nitrogen atmosphere, cooling and granulating to obtain modified polyether sulfone; S3: mixing aluminum nitride and tetrahydrofuran, adding dodecyl phosphate and triethylamine to obtain reaction solution D, stirring and reaction, centrifugal separation to obtain first modified aluminum nitride, dispersing the first modified aluminum nitride in an acetonitrile solution of [BMIM]PF6 to obtain reaction solution E, ultrasonic treatment and vacuum drying to obtain modified aluminum nitride; S4: mixing silicon carbide powder and an ethanol / water mixed solution, adding polyvinylpyrrolidone to obtain a mixed solution, ultrasonic dispersion, adding a mixed coupling agent to obtain reaction solution F, refluxing and centrifugal separation to obtain first treated silicon carbide, dispersing the first treated silicon carbide in a Tris buffer solution, adding dopamine hydrochloride, stirring at room temperature, filtering, washing, and vacuum drying to obtain modified silicon carbide; S5: adding modified polyether ether ketone, modified polyether sulfone, and an antioxidant into a high-speed stirrer to mix, adding modified silicon carbide and modified aluminum nitride to obtain mixed materials, feeding the mixed materials into a twin-screw extruder to extrude, collecting the extrudate to melt-spin, laying the obtained spinning on a web curtain of a web former, and solidifying through a needle punching machine to obtain a blank geotextile, adjusting tension through a tension frame, and cutting edges into a roll through a roll forming machine to obtain a high-temperature-resistant geotextile.

2. The method of claim 1, wherein the geotextile is a high-temperature resistant geotextile. In S1: The mass ratio of the polyether ether ketone to the concentrated sulfuric acid is 1:15-20; The mass ratio of the p-phenylenediamine to the polyether ether ketone is 3-4:100; The constant temperature reaction temperature of the pre-reaction solution is 75-85℃; The constant temperature reaction time of the pre-reaction solution is 4-6h; The volume ratio of the reaction solution A to the deionized water is 1:4-5; The pretreated precipitate is washed until the supernatant pH is 6.5-7.5; The vacuum drying temperature is 70-80℃; The vacuum drying time is 10-12h.

3. The method for preparing a high-temperature resistant geotextile according to claim 1, characterized in that, In S1: The mass ratio of the aminated polyether ether ketone intermediate to the maleic anhydride is 100:2.5-3.5; The mass ratio of the aminated polyether ether ketone intermediate to the dibenzoyl peroxide initiator is 100:0.3-0.7; The melt-reaction temperature of the reaction solution B is 275-285℃; The melt-reaction time of the reaction solution B is 20-30min; The nitrogen flow rate is 100-150mL / min.

4. The method of claim 1, wherein the geotextile is a high temperature resistant geotextile. In S2: The mass ratio of the polyether sulfone to the N-methyl pyrrolidone is 1:10-15; The mass ratio of the polyether sulfone and 4-aminobenzoic acid is 100:3.5-4.5; The temperature of the reaction liquid C stirring reaction is 130-140℃; The time of the reaction liquid C stirring reaction is 4-6h; The temperature of the pre-treatment polyether sulfone vacuum drying after washing is 60-70℃; The time of the pre-treatment polyether sulfone vacuum drying after washing is 12-14h.

5. The method of claim 1, wherein the geotextile is a high temperature resistant geotextile. In S2: The mass ratio of the carboxylated polyether sulfone intermediate and glycidyl methacrylate is 100:3-4; The temperature of the carboxylated polyether sulfone intermediate and glycidyl methacrylate melt mixing is 235-245℃; the time of the carboxylated polyether sulfone intermediate and glycidyl methacrylate melt mixing is 15-20min.

6. The method of claim 1, wherein the geotextile is a high temperature resistant geotextile. In S3: The mass ratio of the aluminum nitride and tetrahydrofuran is 1:10-15; The mass ratio of the aluminum nitride and dodecyl phosphate is 100:3-4; The mass ratio of the aluminum nitride and triethylamine is 100:0.5-1.5; The temperature of the reaction liquid D stirring reaction is 60-70℃; The time of the reaction liquid D stirring reaction is 5-7h; The mass ratio of the first modified aluminum nitride and [BMIM]PF6 is 100:2-3; The concentration of the [BMIM]PF6 acetonitrile solution is 1-2%; The power of the reaction liquid E ultrasonic treatment is 200-300W; The time of the reaction liquid E ultrasonic treatment is 1-2h; The temperature of the vacuum drying is 55-65℃; The time of the vacuum drying is 8-10h.

7. The method of claim 1, wherein the geotextile is a high temperature resistant geotextile. In S4: The volume ratio of ethanol and water in the ethanol / water mixed solution is 9:1-7:3; The mass ratio of the silicon carbide and the ethanol / water mixed solution is 1:10-15; The mass ratio of the polyvinylpyrrolidine and the silicon carbide is 1-2:100; The ultrasonic power of the mixed solution is 300-400W; The ultrasonic time of the mixed solution is 30-40min; The mass ratio of KH550 and KH570 in the mixed coupling agent is 1-2:1; The mass ratio of the silicon carbide and the mixed coupling agent is 100:2-3; The temperature of the reaction liquid F reflux is 65-75℃; The time of the reaction liquid F reflux is 5-7h.

8. The method of claim 1, wherein the geotextile is a high temperature resistant geotextile. In S4: The concentration of the Tris buffer solution is 0.05-0.1M; The solid-liquid mass ratio of the first treated silicon carbide and the Tris buffer solution is 1:8-10; The mass ratio of the first treated silicon carbide and dopamine hydrochloride is 100:1.5-2.5; The time of the room temperature stirring is 8-10h; The temperature of the vacuum drying is 45-55℃; The time of the vacuum drying is 10-12h.

9. The method of claim 1, wherein the geotextile is a high temperature resistant geotextile. In S5: The antioxidant is antioxidant 1010 or antioxidant 1076; The screw extrusion rotation speed is 150-200rpm.

10. A high temperature resistant geotextile prepared by the method of any one of claims 1 to 9, characterized in that, The high-temperature-resistant geotextile comprises the following components by mass fraction:

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