High-temperature-resistant organic composite coating for conveying belt and preparation method thereof

Abstract

The invention belongs to the technical field of conveyor belt coatings, and relates to a high-temperature-resistant organic composite coating for a conveyor belt and a preparation method thereof. According to the method, fumed silica and a silane coupling agent react to prepare n-SiO2-EP, ethylene propylene diene monomer and maleic anhydride are grafted to prepare an EPDM-g-MAH reaction base material, liquid styrene butadiene rubber and mercaptopropyltrimethoxysilane react to prepare L-SSBR, and liquid fluororubber and vinyltriethoxysilane are compounded to prepare the fluororubber toughening agent. Then, mixing the intermediate and operating oil step by step on an open mill to form pre-crosslinked rubber compound, and finally, performing curing and two-stage vulcanization to obtain the organic composite coating. Through multi-step in-situ chemical reaction and synergistic crosslinking, a chemical bond combined three-dimensional interpenetrating network structure is constructed, the high temperature resistance, tearing strength, interface adhesion and aging resistance of the coating are remarkably improved, and the defects that a traditional conveyor belt coating is prone to layering and aging and the mechanical property is reduced in a high-temperature environment are effectively overcome.

Description

Technical Field

[0001] This invention belongs to the field of conveyor belt coating technology, and relates to a high-temperature resistant organic composite coating for conveyor belts and its preparation method. Background Technology

[0002] Conveyor belts are widely used in high-temperature material conveying scenarios such as mining, metallurgy, and building materials. The high-temperature resistance of their surface coating directly affects the service life and safety of the conveyor belt. Existing high-temperature resistant coatings for conveyor belts mostly use rubber-based composite materials (such as simple blends of neoprene, silicone rubber, or fluororubber), prepared through physical blending, filling with inorganic fillers (such as carbon black or diatomaceous earth), or simple vulcanization processes. While these methods can improve heat resistance to some extent, they generally have the following limitations: limited high-temperature resistance; traditional rubber coatings (such as EPDM or SBR-based coatings) are prone to chain segment degradation, oxidative aging, or cross-linking network destruction when exposed to environments above 150°C for extended periods, leading to coating hardening, cracking, or peeling. Poor filler dispersion and interfacial bonding; inorganic fillers (such as silica) are usually introduced through physical mixing, resulting in poor compatibility with the rubber matrix interface, easy agglomeration, stress concentration, decreased tear strength, and a high risk of interfacial debonding at high temperatures. The multi-layer structure suffers from insufficient adhesive strength. The adhesion between the coating and the conveyor belt skeleton material (such as polyester or steel wire rope) relies heavily on physical adsorption or simple adhesives, which are prone to interface failure at high temperatures, leading to delamination or detachment. Its anti-aging properties are weak; under long-term exposure to heat, oxygen, and ozone, traditional coatings experience molecular chain breakage or a decrease in cross-linking density, resulting in a significant reduction in wear resistance and toughness. Furthermore, the process lacks complexity and synergy. Existing preparation methods often rely on multi-step mixing and high-temperature vulcanization, but the lack of synergistic chemical reactions between components makes it difficult to form a stable three-dimensional network structure, limiting performance improvements. Summary of the Invention

[0003] To address the above problems, this invention provides a high-temperature resistant organic composite coating for conveyor belts and its preparation method, specifically including the following steps: Step 1: Mix fumed silica with anhydrous ethanol and stir at 40-50℃ and 100-120 rpm for 10-15 min to form a suspension. Add a silane coupling agent to the suspension at a rate of 4-6% of total mass / min and stir at 65-75℃ and 300-400 rpm for 3.5-4.5 h. During this process, the silane coupling agent hydrolyzes and condenses with the silanol groups on the surface of the silica, firmly grafting epoxy groups onto the silica surface. After the reaction is complete, filter and remove the filtrate. Wash the filter residue with ethanol, using 2-3 times the mass of the filter residue, and dry at 75-85℃ for 5.5-6.5 h to obtain nano-sized epoxy-functionalized silica (n-SiO2-EP).

[0004] Preferably, the mass ratio of the silica, anhydrous ethanol, and silane coupling agent is (5-7):(45-50):1. Most preferably, the silane coupling agent is KH-560 (γ-glycidoxypropyltrimethoxysilane).

[0005] Step 2: Plasticize EPDM rubber and plasticizer on a two-roll mill at 55-65℃ for 8-10 minutes, passing through a thin mill 4-6 times to obtain EPDM plasticized rubber. Then, put the EPDM plasticized rubber, initiator and maleic anhydride (MAH) into a mixer and mix them at 120-130℃ and 35-45rpm for 15-25 minutes. During this process, MAH is grafted onto the EPDM molecular chain through free radical reaction, introducing anhydride functional groups. After cooling, the mixed product is used to obtain EPDM-g-MAH reaction base material.

[0006] Preferably, the mass ratio of EPDM, plasticizer, initiator, and MAH is (40-50):(1.5-2.5):(0.8-1.2):(7-9). Most preferably, the plasticizer is dibromobutenediol, and the initiator is dicumyl peroxide (DCP).

[0007] Step 3: Liquid styrene-butadiene rubber (LSBR) and mercaptopropyltrimethoxysilane (MPTS) are mixed at a mass ratio of (20-30):(3-5). The mixture is stirred at 105-115℃ and 120-150 rpm for 55-65 minutes under inert gas protection. Under these conditions, the methoxy group (-OCH3) in the MPTS molecule will undergo a grafting reaction with the trace unsaturated bonds remaining on the LSBR molecular chain or with free radical sites generated on its main chain under thermal action. Simultaneously, the MPTS molecule itself may also undergo partial hydrolysis and condensation. After the reaction is complete, the mixture is cooled to room temperature to obtain liquid mercaptostyrene-butadiene rubber (L-SSBR). The essence of this compound is that several MPTS molecules are chemically bonded to the LSBR molecular chain, thereby introducing the mercapto (-SH) and methoxy (-OCH3) functional groups of MPTS onto the LSBR matrix.

[0008] Step 4: Mix liquid fluororubber (LFKM), vinyltriethoxysilane (VTES), and acetone in a mass ratio of (25-35):(2-4):(55-65), and shear at 2000-3000 rpm for 15-20 min. During the shearing process, add deionized water at a volume of 8-12% of the total volume. During this process, VTES will partially hydrolyze, and its hydrolysis product (silanol) will undergo a grafting reaction with the active sites on the LFKM molecular chain (such as free radical sites generated in the presence of peroxides). At the same time, unreacted vinyl and ethoxy groups are exposed on the periphery of the molecular chain. Then, remove acetone and water by vacuum distillation to obtain the fluororubber toughening agent.

[0009] Step 5: Place the EPDM-g-MAH reaction base material on a 55-65℃ open mill and roll it with L-SSBR. Pass it through the mill 4-5 times. At this time, the thiol group (-SH) at the end of L-SSBR will undergo a ring-opening reaction with the anhydride group in EPDM-g-MAH to form strong chemical bonds (ester bond and thioester bond), realizing the in-situ chemical bonding of EPDM and SBR molecular chains, which greatly enhances the phase interface strength.

[0010] Subsequently, n-SiO2-EP was added in four batches (with a mass ratio of 2:1:2:1), and the mixture was passed through a thin filter 5-6 times to ensure uniform dispersion. During this process, some of the epoxy groups on the surface of n-SiO2-EP reacted with the remaining anhydride groups in EPDM-g-MAH, while others reacted with the thiol groups of L-SSBR. This allowed the silica to be chemically incorporated into the forming polymer network, rather than simply as a physical filler. Finally, fluororubber toughening agent and processing oil were added, and the mixture was further mixed until homogeneous, yielding a pre-crosslinked compound.

[0011] Preferably, the mass ratio of the EPDM-g-MAH reactive base material, L-SSBR, n-SiO2-EP, fluororubber toughening agent and processing oil is (80-120):(54-56):(65-67):(65-67):(11-22).

[0012] Preferably, the processing oil is one or more selected from aromatic hydrocarbon oil, cycloalkane oil, and paraffin oil. Most preferably, the processing oil is a cycloalkane oil.

[0013] Step 6: Allow the pre-crosslinked compound to stand and mature at room temperature for 22-26 hours, then place it in a flat vulcanizing apparatus preheated to 160-170℃ and perform two-stage vulcanization at 10-20 MPa to obtain the organic composite coating. In the first stage, sulfur and accelerator are added, and the mixture is vulcanized at 150-170℃ for 10-20 minutes. This stage mainly activates the sulfur / accelerator system, which preferentially undergoes conventional sulfur crosslinking with the double bonds in the L-SSBR and EPDM-g-MAH reaction base materials to form the first network.

[0014] In the second stage, initiators and crosslinking agents are added, and the mixture is vulcanized at 160-180℃ for 8-12 minutes. This stage mainly activates the co-crosslinking agent system. This system not only further enhances the crosslinking of the EPDM-g-MAH reactive base material, but its free radicals also attack the remaining epoxy groups of n-SiO2-EP, resulting in interpenetration and co-crosslinking with the network from the first stage, forming a second, denser network. TAIC, as a multifunctional co-crosslinking agent, greatly promotes the crosslinking density between different polymer phases and fillers.

[0015] Preferably, the mass ratio of the pre-crosslinked compound, sulfur, accelerator, initiator, and crosslinking agent is 100:(0.8-0.9):(0.6-0.7):(1-1.05):(1.3-1.4). Most preferably, the accelerator is 2,2-dibenzothiazole disulfide (DM), the initiator is DCP, and the crosslinking agent is TAIC.

[0016] The n-SiO2-EP and EPDM-g-MAH prepared by this invention are no longer inert raw materials, but intermediates endowed with specific chemical reactivity, which are more effective than traditional physical modification (such as simple silanization or mastication).

[0017] The sequential in-situ reaction mixing and multifunctional synergistic vulcanization of this invention constitute a coherent, reaction-driven process, which is no longer simply mixing raw materials, but assembling a pre-designed molecular structure.

[0018] The pretreatment of raw materials in this invention lays the foundation for coating preparation. Without the anhydride bridge of EPDM-g-MAH, the thiol groups of L-SSBR cannot achieve in-situ bonding. Without the epoxy nodes of n-SiO2-EP, the chemical connection between the filler and the matrix cannot be achieved. Pretreatment is a prerequisite for subsequent chemical reactions.

[0019] The mixing process of this invention achieves in-situ compatibilization between polymers, while the vulcanization process further completes the deep cross-linking of the entire system of polymer-filler-crosslinking agent. The two preparation stages are progressive, which thoroughly activates and solidifies the potential reactivity of the pretreated intermediates.

[0020] The composite coating of this invention ultimately forms a three-dimensional interpenetrating-crosslinked network, in which EPDM provides skeletal toughness, L-SSBR provides adhesion and abrasion resistance, fluororubber toughening agent provides high-temperature resistance, and n-SiO2-EP serves as uniformly distributed and chemically bonded nano-reinforcing nodes within the network. This structure results in a synergistic multiplier effect on the coating's high-temperature resistance, tear strength, adhesion strength to the skeletal material, and anti-aging properties, far exceeding the linear summation of the properties of each component.

[0021] The present invention has the following advantages: (1) Excellent high-temperature resistance and thermal stability: This invention significantly improves the high-temperature resistance of the coating by introducing fluororubber toughening agents and nano-sized epoxy functionalized silica (n-SiO2-EP), forming a chemical bond network with EPDM-g-MAH and L-SSBR. The coating maintains its flexibility and integrity even after long-term use at high temperatures, without cracking or softening. Its thermal oxidation stability is far superior to that of traditional rubber coatings. This is because the introduction of fluororubber and the densification of the cross-linked network effectively inhibit the movement and degradation of molecular chains at high temperatures.

[0022] 2) Excellent filler dispersibility and interfacial chemical bonding: Unlike traditional physical fillers, this invention grafts epoxy groups onto the surface of silica using a silane coupling agent (such as KH-560). During the mixing process, these epoxy groups react chemically with the anhydride groups of EPDM-g-MAH and the thiol groups of L-SSBR, enabling the nanofiller to be covalently integrated into the polymer network. This not only prevents filler agglomeration but also significantly enhances interfacial bonding, allowing the coating to maintain high tear strength and abrasion resistance even at high temperatures.

[0023] (3) Strong interlayer adhesion and interfacial durability: This invention achieves chemical bonding between EPDM and SBR molecules through the in-situ ring-opening reaction of the thiol groups of L-SSBR and the anhydride groups of EPDM-g-MAH, forming ester and thioester bonds, which greatly enhances the interfacial adhesion between the coating and the conveyor belt skeleton material. Even under high temperature, high humidity, or dynamic stress environments, the coating can still adhere firmly, effectively overcoming the delamination problem caused by insufficient physical adhesion in traditional coatings.

[0024] 4) Significantly improved anti-aging and durability: This invention constructs a double cross-linked network through a two-stage vulcanization process: the first stage involves sulfur cross-linking to form a basic network, and the second stage involves the reaction of the TAIC cross-linking agent with the remaining epoxy groups to form an interpenetrating network. This structure effectively inhibits chain segment breakage caused by thermo-oxidative aging and ozone erosion, enabling the coating to maintain high elasticity, crack propagation resistance, and wear resistance even after long-term use, thus significantly extending its service life.

[0025] 5) The preparation process of this invention is no longer a simple physical mixing process, but rather a continuous process of pretreatment-in-situ reaction-synergistic vulcanization, achieving deep cross-linking of the entire polymer-filler-crosslinking agent system. Each component (such as n-SiO2-EP, EPDM-g-MAH, L-SSBR) is endowed with specific reactivity, gradually building a three-dimensional network during mixing and vulcanization, ultimately forming a composite structure with EPDM as the skeleton, L-SSBR as the adhesive layer, fluororubber as the high-temperature resistant reinforcing phase, and n-SiO2-EP as nanonodes. This design results in a synergistic multiplier effect on the coating performance, far exceeding the simple summation of the properties of each component. Detailed Implementation

[0026] The technical solutions in the embodiments of the invention are described clearly and completely below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1 Step 1: Mix fumed silica with anhydrous ethanol and stir at 45°C and 105 rpm for 13 min to form a suspension. Add coupling agent KH-560 to the suspension at a rate of 5% of total mass / min. Stir at 70°C and 350 rpm for 4 h. Filter and remove the filtrate. Wash the filter residue with ethanol, using 2.5 times the mass of the filter residue. Dry at 70°C for 6 h to obtain n-SiO2-EP.

[0028] The mass ratio of the silica, anhydrous ethanol, and coupling agent KH-560 is 6:48:1.

[0029] Step 2: Plasticize EPDM and dibromobutenediol on a two-roll mill at 60°C for 9 minutes, passing through a thin mill 5 times to obtain EPDM plasticized rubber; put the EPDM plasticized rubber, initiator DCP and MAH into an internal mixer, and react at 125°C and 40 rpm for 20 minutes. After cooling, obtain EPDM-g-MAH reaction base material.

[0030] The mass ratio of EPDM, bromobutenediol, initiator DCP, and MAH is 45:2:1:8.

[0031] Step 3: Mix LSBR and MPTS at a mass ratio of 25:4, stir at 110°C and 135 rpm for 60 min under nitrogen protection, and cool to room temperature to obtain L-SSBR.

[0032] Step 4: Mix LFKM, VTES and acetone in a mass ratio of 30:3:60, shear at 2500 rpm for 18 min, add deionized water during the shearing process, the amount of which is 10% of the total volume, remove acetone and water by vacuum distillation, and obtain fluororubber toughening agent.

[0033] Step 5: Place the EPDM-g-MAH reactive base material on a 60℃ open mill and roll it. Add L-SSBR and pass it through the mill 4 times. Then add n-SiO2-EP in four separate passes (with a mass ratio of 2:1:2:1) and pass it through the mill 5 times. Finally, add the fluororubber toughening agent and cycloalkane oil and continue to mix until homogeneous to obtain the pre-crosslinked compound.

[0034] The mass ratio of EPDM-g-MAH reaction base material, L-SSBR, n-SiO2-EP, fluororubber toughening agent and cycloalkane oil is 100:55:66:66:16.

[0035] Step 6: Allow the pre-crosslinked compound to stand and mature at room temperature for 24 hours, then place it in a flat vulcanizing apparatus preheated to 165℃ and perform two-stage vulcanization at 15 MPa to obtain the organic composite coating. In the first stage, sulfur and accelerator DM are added, and the mixture is vulcanized at 160°C for 15 minutes. In the second stage, initiator DCP and crosslinking agent TAIC are added, and the mixture is vulcanized at 170°C for 10 minutes.

[0036] The mass ratio of the pre-crosslinked compound, sulfur, accelerator DM, initiator DCP, and crosslinking agent TAIC is 100:0.85:0.65:1.02:1.35.

[0037] Experimental Example 1 Sample preparation: Experimental group: High-temperature resistant organic composite coating samples were prepared according to the preparation method in Example 1.

[0038] Control group: Traditional Teflon conveyor belt coating purchased from Taizhou Tongjida New Materials Co., Ltd.

[0039] Control group 2: Traditional EPDM conveyor belts purchased from Shandong Kaiyu Rubber Co., Ltd.

[0040] The above samples are made into standard test specimens, such as dumbbell-shaped specimens (for tensile testing), right-angled specimens (for tear testing), coating-skeleton composite specimens (for adhesion testing), etc.

[0041] Thermal stability test: The instrument used was a thermogravimetric analyzer (TGA, model: TGA-8000). The test conditions were nitrogen atmosphere, heating rate of 10°C / min, temperature range of 30-800°C, and sample mass of 5-10 mg. The sample was placed in a TGA crucible, and the initial mass was recorded. The program was started, and the temperature was increased to 800°C at a rate of 10°C / min. The change in sample mass with temperature was recorded in real time. The initial decomposition temperature (T0) was calculated. d 5%, i.e., the temperature at which 5% mass loss occurs, and the maximum decomposition temperature (T). max Each sample was tested three times, and the average value was taken.

[0042] Mechanical property testing: The instrument used was a universal testing machine (model: Instron-5967), conforming to ASTM D412 and ASTM D624 standards. Dumbbell-shaped specimens (size: ASTM D412 Type C) were clamped in the testing machine, the tensile speed was set to 500 mm / min, the test was started, and the maximum tensile strength (MPa) and elongation at break (%) were recorded. Right-angled specimens (size: ASTM D624 Type C) were clamped in the testing machine, the tearing speed was set to 500 mm / min, the test was started, and the tear strength (kN / m) was recorded. Each sample was tested 5 times, and the average value was taken.

[0043] Adhesion strength test: The instrument is a peel tester (model: Adhesion-Tester-2000), the standard is ASTM D903. The coating is applied to the polyester conveyor belt skeleton material (thickness: 2mm). After curing, a composite sample is formed. The sample is cut into strips 25mm wide and 150mm long, and a 180° peel test is performed. The peel speed is 100mm / min. The peel strength (N / mm) is recorded. Each sample is tested 5 times and the average value is taken.

[0044] Thermo-oxidative aging test: The instrument is a high-temperature oven (model: Oven-Binder-115). The tensile test specimens are placed in the oven and aged at 150°C for 7 days. The specimens are then removed and cooled to room temperature (23°C). The tensile strength and elongation at break after aging are tested, and the performance retention rate is calculated (performance after aging / initial performance × 100%). Repeatability: Each sample is tested 5 times, and the average value is taken.

[0045] Abrasion resistance test: The instrument used was a Taber abrasion tester (model: Taber-5150), and the standard was ASTM D4060. The coated sample was made into a circular specimen (diameter: 100mm, thickness: 2mm). A CS-10 grinding wheel was used, with a load of 1kg. After rotating 1000 revolutions, the mass loss (mg) of the sample was recorded. Each sample was tested 3 times, and the average value was taken.

[0046] Table 1 Thermal stability test results

[0047] Table 2 Mechanical Performance Test Results

[0048] Table 3 Interfacial Adhesion Performance Peel strength (N / mm) experimental group 10.1±0.4 Control group 1 4.9±0.6 Table 4 Performance retention rate after thermo-oxidative aging Tensile strength retention rate (%) Elongation at break retention (%) experimental group 95.2 90.1 Control group 1 97.3 95.2 Control group 2 68.5 58.3 Table 5 Abrasion Resistance Mass loss (mg) experimental group 48±3 Control group 1 120±10 Control group 2 105±8 As shown in Tables 1-5, although the thermal stability of the organic composite coating prepared in Example 1 is not as good as that of Teflon, it has an overwhelming advantage in mechanical properties compared to Teflon. Its thermal stability is far superior to that of traditional EPDM, with a maximum decomposition temperature of 450℃, about 100℃ higher than that of traditional EPDM, indicating that its crosslinked network has higher thermal stability. The long-term service temperature range of the coating of this invention covers most high-temperature industrial scenarios, achieving a balance between high-temperature resistance and comprehensive performance. The coating of this invention exhibits significantly higher tensile strength and tear strength than the two control groups, while maintaining extremely high toughness. This demonstrates the effectiveness of its chemically bonded reinforcing network, overcoming the shortcomings of Teflon's high brittleness and traditional EPDM's insufficient strength. The interlayer adhesion strength of the coating of this invention is four times that of the Teflon coating, thanks to its unique in-situ interfacial chemical bonding technology, which fundamentally solves the risk of delamination at high temperatures. After long-term thermo-oxidative aging, the performance retention rate of the coating of this invention far exceeds that of traditional EPDM conveyor belts and is close to that of Teflon with intrinsic stability, demonstrating the excellent anti-aging ability and long-term durability of its crosslinked network.

[0049] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for preparing a high-temperature resistant organic composite coating for conveyor belts, characterized in that, Includes the following steps: Step 1: Mix fumed silica with anhydrous ethanol to form a suspension. Add silane coupling agent to the suspension at a rate of 4-6% of total mass / min. Stir at 65-75℃ and 300-400 rpm for 3.5-4.5 hours. Filter, remove the filtrate, wash the filter residue with ethanol and dry to obtain n-SiO2-EP. Step 2: Plasticize EPDM with plasticizer at 55-65℃ for 8-10 minutes, passing through a thin tube 4-6 times to obtain EPDM plasticized rubber; then, mix EPDM plasticized rubber, initiator and MAH at 120-130℃ and 35-45rpm for 15-25 minutes, and cool to obtain EPDM-g-MAH reaction base material. Step 3: Mix LSBR and MPTS at a mass ratio of (20-30):(3-5), stir at 105-115℃ and 120-150rpm for 55-65min under inert gas protection, and cool to room temperature to obtain L-SSBR. Step 4: Mix LFKM, VTES and acetone in a mass ratio of (25-35):(2-4):(55-65) and shear. Add deionized water during the shearing process, the amount of which is 8-12% of the total volume. Remove acetone and water by vacuum distillation to obtain fluororubber toughening agent. Step 5: Place the EPDM-g-MAH reactive base material on a 55-65℃ open mill and add L-SSBR, passing it through the mill 4-5 times. Add n-SiO2-EP in multiple batches, passing it through the mill 5-6 times. Then add fluororubber toughening agent and processing oil, and mix evenly to obtain a pre-crosslinked compound. Step 6: Let the pre-crosslinked compound stand at room temperature for 22-26 hours to mature, and then perform two-stage vulcanization at 10-20 MPa to obtain an organic composite coating: In the first stage, add sulfur and accelerator, and vulcanize at 150-170℃ for 10-20 minutes; in the second stage, add initiator and crosslinking agent, and vulcanize at 160-180℃ for 8-12 minutes. The mass ratio of the pre-crosslinked compound, sulfur, accelerator, initiator and crosslinking agent is 100:(0.8-0.9):(0.6-0.7):(1-1.05):(1.3-1.4).

2. The method for preparing a high-temperature resistant organic composite coating for conveyor belts according to claim 1, characterized in that, The mass ratio of silica, anhydrous ethanol and silane coupling agent in step one is (5-7):(45-50):

1.

3. The method for preparing a high-temperature resistant organic composite coating for conveyor belts according to claim 1, characterized in that, The silane coupling agent mentioned in step one is KH-560.

4. The method for preparing a high-temperature resistant organic composite coating for conveyor belts according to claim 1, characterized in that, The mass ratio of EPDM, plasticizer, initiator and MAH in step two is (40-50):(1.5-2.5):(0.8-1.2):(7-9).

5. The method for preparing a high-temperature resistant organic composite coating for conveyor belts according to claim 1, characterized in that, The plasticizer mentioned in step two is dibromobutenediol, and the initiator is DCP.

6. The method for preparing a high-temperature resistant organic composite coating for conveyor belts according to claim 1, characterized in that, The mass ratio of EPDM-g-MAH reaction base material, L-SSBR, n-SiO2-EP, fluororubber toughening agent and processing oil in step five is (80-120):(54-56):(65-67):(65-67):(11-22).

7. The method for preparing a high-temperature resistant organic composite coating for conveyor belts according to claim 1, characterized in that, The processing oil mentioned in step five is one or more of aromatic hydrocarbon oil, cycloalkane oil, and paraffin oil.

8. The method for preparing a high-temperature resistant organic composite coating for conveyor belts according to claim 7, characterized in that, The operating oil is a cycloalkane oil.

9. The method for preparing a high-temperature resistant organic composite coating for conveyor belts according to claim 1, characterized in that, The promoter mentioned in step six is ​​DM, the initiator is DCP, and the crosslinking agent is TAIC.

10. A high-temperature resistant organic composite coating for conveyor belts prepared by the method of any one of claims 1-9.

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