A high-temperature-resistant rubber material for conveyor belts and a method for producing the same

Abstract

The application relates to the technical field of conveying belt materials, and discloses a high-temperature-resistant rubber material for a conveying belt and a preparation method thereof. The rubber material comprises a ternary ethylene-propylene rubber matrix, a reinforcing filler system, a heat-resistant modification framework, a coupling and reinforcing component, a cross-linking control system and an anti-aging component. The matrix is coated with a modified isolation layer, the filler system is connected with a stress release unit through a heat dissipation guide pipeline, and the heat-resistant framework generates a chemical shielding response through a main antioxidant function ring and a side chain. The preparation method comprises mixing and two-stage vulcanization, and the vulcanization process involves mold indexing and molecular chain recombination. The application can realize anti-aging agent controlled release and local stress relief through a multi-level structure design, significantly improves the thermal oxygen stability, degradation resistance and anti-cracking performance of the material under extreme working conditions, effectively eliminates the vulcanization anisotropy, and prolongs the service life of the conveying belt.

Description

Technical Field

[0001] This invention relates to the field of conveyor belt material technology, specifically to a high-temperature resistant conveyor belt rubber material and its preparation method. Background Technology

[0002] In existing technologies, EPDM rubber is often used as the main material for high-temperature resistant conveyor belts. Its material composition typically includes a rubber matrix, with reinforcing agents, softeners, vulcanizing agents, and antioxidants added within the matrix. These components are fully dispersed during the mixing process and form a cross-linked network structure after vulcanization, thereby enabling the carrying and conveying of high-temperature materials during production.

[0003] However, while conventional technical solutions ensure basic heat resistance and conveying performance, their thermo-oxidative stability under continuous high-temperature pulse impacts still has room for further optimization. This limits the surface crack resistance of conveyor belts during long-term service. Furthermore, existing rubber materials tend to degrade or excessively cross-link their molecular chains when heated, which restricts the improvement of conveyor belt service life under high-intensity operating conditions.

[0004] Therefore, there is a need to provide a rubber material for high-temperature resistant conveyor belts and a method for preparing the same, in order to improve the aforementioned technical problems. Summary of the Invention

[0005] This invention provides a rubber material for high-temperature resistant conveyor belts and a method for preparing the same.

[0006] One of the technical solutions of this invention is: a high-temperature resistant conveyor belt rubber material, the structure and composition of which are as follows: the base phase of the rubber material is a rubber matrix, and a reinforcing filler system, a heat-resistant modified structure, a coupling reinforcement component, a crosslinking control system, and an anti-aging component are distributed in the micro-network of the rubber matrix. The reinforcing filler system constructs a skeleton that supports the mechanical load of the material by uniformly impregnating and dispersing active reinforcing particles within the free volume of the rubber matrix. The heat-resistant modified structure is composed of heat-resistant additives that have undergone surface chemical modification. These additives are implanted between the long-chain molecules of the rubber matrix through molecular chain insertion. Under macroscopic thermal stress, this structure sequentially executes a free radical capture program, a thermo-oxidative degradation inhibition program, a crosslinking network stabilization program, and a surface crack protection program. The coupling reinforcement component is arranged at the contact interface between the rubber matrix and the reinforcing filler system, connecting the two through chemical bonding. The crosslinking control system is located at the crosslinking sites generated by the vulcanization reaction, and it regulates the thermal stability of the rubber material through a synergistic vulcanization induction mechanism. The anti-aging component covers the surface of the rubber material. When the material is excited by temperature rise, the surface component adjusts the thermo-oxidative active state to the thermo-oxidative passivated state through functional group state switching.

[0007] In the specific structure of the rubber matrix, its core component is ethylene propylene diene monomer (EPDM) rubber. The outer surface of the EPDM rubber is covered with a modified isolation layer, which forms a physical barrier to provide thermal insulation protection for the internal rubber matrix. In terms of mass ratio, the EPDM rubber and the modified isolation layer are configured according to a preset proportion. A first activity index additive is cured within the rubber matrix and in the region adjacent to the reinforcing filler system. The first activity index additive is connected to a reinforcing carrier framework through a blending reaction. The reinforcing carrier framework exhibits a radial structure, and through its terminal functional groups, it pulls the functional components within the reinforcing filler system towards the center of the rubber matrix, forming a centripetal reinforcing structure.

[0008] At the microscopic level, the reinforcing filler system comprises activated carbon black and nano-silica cores. The nano-silica cores are arranged between rubber molecular chains in a rotationally connected manner, driven by surface functional groups. The nano-silica cores have four circumferentially modified grafting sites, each with a silane coupling axis fixed at its bottom via chemisorption. The silane coupling axis undergoes a controlled coupling reaction with the heat-resistant modified structure during the mixing process. Simultaneously, metal oxide particles are fixedly adsorbed on the surface of the nano-silica cores, each particle possessing three symmetrically distributed anchoring adsorption groups. Two of these anchoring adsorption groups are covered with an antioxidant coating layer via physical deposition, which shields the microscopic interface of the reinforcing filler system during the mixing stage.

[0009] In the structural design of the heat-resistant modified architecture, it includes multiple heat-resistant carriers dispersed on the rubber matrix, which are driven by the power generated by the vulcanization reaction. A primary antioxidant functional ring is fixedly installed on the outer edge of each heat-resistant carrier. A first anti-aging connecting shaft is chemically bonded to the rubber matrix, corresponding to the radial position of the primary antioxidant functional ring. An auxiliary stabilizing side chain is laterally fixed to the first anti-aging connecting shaft. The auxiliary stabilizing side chain and the primary antioxidant functional ring are spatially close to each other and generate synergistic induction. Under high-temperature pulse impact, an intermolecular chemical shielding response occurs between the heat-resistant carrier and the auxiliary stabilizing side chain, absorbing and converting heat energy.

[0010] The reinforcing filler system further integrates thermally conductive fillers and fatigue-resistant reinforcing agents. The thermally conductive filler is blended with the rubber matrix and physically connected to a heat dissipation guiding conduit. The nano-silica core has a diffused microporous structure inside, which communicates with the inner cavity of the antioxidant coating layer, and its bottom end is fluidly connected to the heat dissipation guiding conduit. Heat-absorbing buffer holes are formed on the surface of the thermally conductive filler at locations corresponding to high-temperature stress concentration points. The active reactive end of the fatigue-resistant reinforcing agent is inserted into the heat-absorbing buffer holes. The heat dissipation guiding conduit is connected to stress-relieving units at corresponding surface crack sites, thermal degradation sites, and excessive cross-linking sites, alleviating localized stress through the physical principle of thermal expansion and contraction.

[0011] In the operation mechanism of the crosslinking control system, there are synergistic vulcanization centers dispersed in the vulcanization region. A synergistic accelerator is chemically bonded to each synergistic vulcanization center. The synergistic accelerator is connected to an active excitation drive shaft via a rotating bearing structure. A vulcanization gain ring structure is fitted onto the active excitation drive shaft. A zinc salt component is pre-embedded in the rubber matrix. When the vulcanization reaction reaches a set temperature, the vulcanization gain ring structure undergoes a chelation and complexation reaction with the zinc salt component. A crosslinking bridging frame is provided at the end of the active excitation drive shaft, and flexible molecular chains are connected to its inner wall via physical anchoring. A thermal stabilizer is also fixed on the crosslinking bridging frame. The bottom end of the flexible molecular chain connects to a stress-absorbing end, and the thermal stabilizer is connected to the stress-absorbing end via branched chains. The flexible molecular chain undergoes intermolecular mechanical entanglement with the vulcanization gain ring structure through a linkage entanglement element.

[0012] The linkage entanglement component includes a second chemical bond connecting shaft adsorbed on the cross-linking bridging frame. A passive functional inducing group is fixed at the tail end of this connecting shaft, and this inducing group achieves a transmission engagement with the sulfurized gain ring structure. Driven induced binding sites are provided at the front end of the second chemical bond connecting shaft and on the flexible molecular chain. The two binding sites attract and bind to each other through hydrogen bonding forces, forming stable cross-linking nodes.

[0013] The anti-aging component comprises two sets of physical protective barriers and two sets of chemical trapping units. These components are fixed to the surface of the rubber matrix, and their arrangement corresponds to the surface cracking tendency sites and thermo-oxidative aging sensitive sites of the material. A second structural reinforcement module is mounted on the physical protective barrier; the surface of this module is chemically deposited to form a dense protective film that prevents external oxygen from penetrating into the rubber.

[0014] The coupling reinforcement component includes an active reference plate fixedly connected to the rubber matrix. An organosilane sensing head and a metal chelate response end are mounted on the active reference plate. A molecularly controlled network composed of conductive polymer is arranged on the surface layer of the rubber matrix. This network, along with the organosilane sensing head and the metal chelate response end, establishes a signal and energy conduction connection, providing feedback regulation of the bonding force at the micro-interface.

[0015] Another technical solution of the present invention is: the preparation method of the above-mentioned rubber material, the execution steps of which are as follows: Step SS01: Perform the mixing operation. Before preparation, connect the feed port of the internal mixer to the hopper containing the rubber compounds of each component. The rotor inside the internal mixer sequentially feeds the batches of components into the mixing chamber. The mixed primary rubber compound is discharged through the discharge port to the conveying mechanism of the calendering equipment. During the mixing process, the total mass input of each component is determined by the formula... Real-time monitoring is performed by adjusting the weighting coefficients of each component. Match raw materials from different batches. For intermediate rubber compounds that do not meet quality standards, implement downgrading and diversion procedures.

[0016] Step SS02: Perform vulcanization. The mixed rubber block is fed into the vulcanization mold. The hydraulic system of the vulcanizing machine drives the mold press, filling the mold cavity of the molding frame with the rubber compound. The heating system outputs heat energy to drive the rubber molecules to undergo a cross-linking reaction, thus determining the degree of vulcanization. According to the formula Dynamic fitting is performed. Once a pre-set threshold is reached during a vulcanization period, the indexing mechanism drives the mold to rotate 90 degrees, transferring the material to the second vulcanization zone. In this zone, an infrared heating module heats the rubber material non-contactly, raising its temperature to the secondary reaction temperature. During this temperature rise, the rubber molecular chains undergo spatial recombination and rotate 180 degrees. After vulcanization, online monitoring equipment samples the finished product's performance. Based on the monitoring feedback, the central control unit pushes the finished product to the finished product collection area via a pushing mechanism, or pushes defective products into the substandard product processing area.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are: This invention integrates a molecular central control network with an active reference plate to achieve real-time monitoring and adjustment of the microscopic interface of rubber materials, ensuring the stability of the chemical bond between the reinforcing filler and the matrix. In the preparation process, two-stage vulcanization combined with 90-degree inversion and 180-degree molecular chain rearrangement eliminates anisotropy caused by gravity or temperature differences during vulcanization, improving the uniformity of the finished product's physical properties. This multi-level, multi-functional structural design systematically solves the technical defects of high-temperature conveyor belts under extreme and complex working conditions, such as poor thermo-oxidative stability, easy degradation, easy cracking, and short service life. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall process of the rubber material of this invention; Figure 2 This is a schematic diagram of the core process of nano-silica in the reinforcing filler system of this invention; Figure 3 This is a schematic diagram of the collaborative process between the heat-resistant modified architecture and the crosslinking control system of the present invention; Figure 4 This is a schematic diagram of the vulcanization process in the preparation method of this invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0020] To make the technical objectives, technical solutions, and beneficial effects of this invention clearer, the following description is provided in conjunction with the appendix. Figure 1 To be continued Figure 4 The present invention provides a detailed description of the rubber material for a high-temperature resistant conveyor belt and its preparation method, along with specific implementation methods.

[0021] refer to Figure 1 This invention provides a high-temperature resistant conveyor belt rubber material, the core of which is based on a highly ordered grid-like logic in its microstructure. The rubber matrix, as the basic phase of the entire material, constitutes a continuous macroscopic background. Within its internal microscopic space, reinforcing filler systems, heat-resistant modified structures, coupling reinforcement components, crosslinking control systems, and anti-aging components are intertwined through complex chemical bonds and physical entanglements. The core of the rubber matrix is ​​composed of EPDM rubber, which possesses excellent weather resistance and chemical resistance. However, to meet extreme high-temperature requirements, a modified isolation layer is coated on the outer surface of the EPDM rubber through chemical deposition or in-situ coating processes. This modified isolation layer, microscopically appearing as a dense nanoscale skin, is made of a heat-resistant polymer with a higher heat distortion temperature. Through physical barrier action, it thermally isolates heat energy from the internal rubber matrix, thereby slowing down the penetration rate of heat and oxygen into the long-chain rubber backbone. In terms of weight ratio, EPDM rubber and modified isolation layer are configured in a preset ratio of 10:1 to 15:1 to ensure that the matrix has primary heat protection capability while maintaining flexibility.

[0022] Within the rubber matrix, particularly in the transition region adjacent to the reinforcing filler system, a first activity index additive is cured. This additive not only acts as an interfacial binder but also spatially connects the reinforcing carrier framework through a blending reaction. The reinforcing carrier framework is designed with a biomimetic radial structure, its center point coinciding with the node of the reinforcing filler system, extending outwards through multiple terminal functional groups. Under macroscopic tensile force or thermal expansion stress, this radial structure can pull the functional components within the reinforcing filler system towards the center of the rubber matrix through a centripetal tensioning effect, forming a centripetal reinforcing structure. This significantly improves the structural stability and creep resistance of the material at high temperatures.

[0023] refer to Figure 2 The reinforcing filler system exhibits extremely high precision at the microscopic level. In addition to the basic mechanical strength provided by conventional activated carbon black, this invention introduces a nano-silica core. Unlike traditional static fillers, the nano-silica core is arranged between rubber molecular chains in a rotational connection manner. This "rotation" is driven by the weak electrostatic attraction between the polar functional groups on the core surface and the rubber molecular chains, allowing the filler to make minute self-adjustments in position according to changes in stress direction. Four active grafting sites are symmetrically distributed and modified and connected along the circumference of the nano-silica core. At the bottom of each active grafting site, a silane coupling axis is firmly fixed by chemisorption. During the mixing process, these silane coupling axes act as "mechanical tentacles," undergoing a controlled coupling reaction with the functional groups in the heat-resistant modified structure, locking the reinforcing system and the heat-resistant system at the molecular level.

[0024] Simultaneously, metal oxide particles, such as zinc oxide or magnesium oxide nanoparticles, are adsorbed on the surface of the nano-silica core, each bearing three symmetrically distributed anchored adsorption groups. Notably, two of these anchored adsorption groups are coated with an antioxidant encapsulation layer via physical deposition. This design mimics the principle of a controlled-release capsule, where the encapsulation layer, by shielding the reinforcing filler interface during the mixing stage, prevents premature deactivation of the antioxidant during high-temperature mixing. When the conveyor belt encounters temperature rise during later service, the encapsulation layer gradually melts or permeates, thereby achieving continuous and precise release of the antioxidant.

[0025] refer to Figure 3The synergistic effect of the heat-resistant modified architecture and the crosslinking control system is key to the high-temperature resistance of this invention. The heat-resistant modified architecture comprises multiple heat-resistant carriers dispersed on a rubber matrix. These heat-resistant carriers are not static but are driven by the chemical dynamics generated by the vulcanization reaction to find stable sites in the intermolecular gaps of the rubber matrix. A main antioxidant functional ring is fixedly mounted on the outer edge of the heat-resistant carrier, and this ring structure is composed of macromolecular chains containing hindered phenolic or amine functional groups. On the rubber matrix, corresponding to the radial position of the main antioxidant functional ring, a first anti-aging connecting axis is chemically bonded, and an auxiliary stabilizing side chain is laterally fixed to this axis. The auxiliary stabilizing side chain and the main antioxidant functional ring are spatially very close, thereby generating a synergistic sensing effect. When the material is subjected to a sudden high-temperature pulse impact, a chemical shielding response between the heat-resistant carrier and the auxiliary stabilizing side chain is induced. Specifically, the auxiliary stabilizing side chain absorbs and converts a large amount of heat energy through orientation changes and vibrational energy level transitions, thereby protecting the main chain of the rubber matrix from degradation and breakage.

[0026] The reinforcing filler system also integrates thermally conductive fillers and fatigue-resistant reinforcing agents. The thermally conductive fillers are distributed within the rubber matrix and physically connected to heat dissipation guiding channels. (Reference) Figure 2 and Figure 3 The nano-silica core incorporates a diffused microporous structure. This microporous structure connects upwards to the inner cavity of the antioxidant coating layer and downwards through a heat dissipation channel at its bottom. This interconnected micro-channel not only facilitates the migration of the antioxidant but also forms a "highway" for heat conduction. On the surface of the thermally conductive filler, heat-absorbing buffer holes are formed to address potential localized overheating points (stress concentration points). The active reactive end of the fatigue-resistant reinforcing agent is inserted into these heat-absorbing buffer holes, temporarily storing heat using the material's pore effect and dissipating energy through the movement of the fatigue-resistant agent's molecular chains. The heat dissipation channel connects to stress-relieving units at points on the material surface prone to cracking, degradation, or excessive cross-linking. These stress-relieving units utilize the physical principle of thermal expansion and contraction, undergoing micro-volume expansion when the local temperature is excessively high, thereby alleviating internal stress caused by localized temperature differences and preventing the initiation and propagation of cracks.

[0027] The operating logic of the crosslinking control system also reflects the characteristics of intelligent regulation. Dispersed synergistic vulcanization centers are distributed within the vulcanization region, each connected to a synergistic accelerator. The synergistic accelerator is connected to an active excitation drive shaft via a precision rotating bearing structure. A vulcanization gain ring structure is fitted onto this drive shaft. This invention pre-embeds a specific amount of zinc salt component within the rubber matrix. When the vulcanization temperature reaches a set value, the vulcanization gain ring structure undergoes a strong chelation and complexation reaction with the zinc salt component, generating high-strength crosslinking points in situ. A crosslinking bridging frame is located at the end of the active excitation drive shaft, its inner wall connected to flexible molecular chains via physical anchoring. A heat-stabilizing regulator is also fixed on the crosslinking bridging frame. The bottom end of the flexible molecular chain extends directly to the stress-absorbing end, while the heat-stabilizing regulator is connected to this end via branched chains.

[0028] The flexible molecular chain and the vulcanized gain ring structure are mechanically entangled through a linkage entanglement element. The linkage entanglement element specifically includes a second chemical bond connecting axis adsorbed on a crosslinking bridging framework. The tail end of this axis has a passive functional inducible group, which achieves a transmission-like molecular interaction with the vulcanized gain ring structure. Both the front end of the second chemical bond connecting axis and the flexible molecular chain have follower induced binding sites. These two binding sites attract and bind to each other through strong hydrogen bonding forces, thus forming a stable, buffered crosslinking node network around the crosslinking point. This design ensures that the slippage of the molecular chain during high-temperature stretching of the rubber is not abrupt, but rather constrained by the flexible long chain and the entanglement element, greatly improving the material's fracture energy.

[0029] The layered structure of the anti-aging components provides external protection for the material. It comprises two sets of physical protective barriers and two sets of chemical trapping units, all of which are fixed to the surface of the rubber matrix. A second structural reinforcement module is mounted on the physical protective barrier; the surface of this module is chemically deposited to form a dense, ceramic-like protective film. This film is not only wear-resistant but, more importantly, effectively prevents external oxygen and ozone from penetrating into the rubber. Simultaneously, the coupling reinforcement component is fixed to the rubber matrix via an active reference plate, which is equipped with an organosilane sensing head and a metal chelating response end.

[0030] On the surface layer of the rubber matrix, a molecularly controlled network composed of conductive polymers such as polyaniline or polypyrrole is arranged. This network connects with the organosilane sensing head and the metal chelating response end for signal and energy conduction. In actual service scenarios, when the bonding strength at the micro-interface begins to decrease due to thermal stress, the molecularly controlled network can sense the change in charge distribution and adjust the chemical bond strength at the interface accordingly. This closed-loop feedback adjustment mechanism ensures the bonding stability between the reinforcing filler and the rubber matrix under long-term high-temperature fluctuations.

[0031] refer to Figure 4The method for preparing the rubber material provided by the present invention includes the following detailed steps.

[0032] Step SS01: Perform the mixing operation. In this stage, the feed inlet of the internal mixer is precisely aligned with the hopper containing the various components of the rubber compound, including EPDM rubber, modified release layer material, and reinforcing fillers. Inside the internal mixer, the rotor sequentially feeds batches of components into the mixing chamber at a set shear rate. During the mixing process, to ensure the consistency of performance across different batches, the total mass of each component is managed in real-time through an online monitoring system. The monitoring system uses a formula... Perform calculations, where For the first The standard mass of the components, and The weighting coefficients are adjusted in real time based on parameters such as the activity purity and moisture content of the raw materials. Through this dynamic adjustment, even if there are slight fluctuations in the raw materials, the final mixed rubber compound can still match the predetermined formula ratio. For intermediate rubber compounds that do not meet the quality standards, the system will automatically trigger the discharge mechanism to perform downgrading and diversion processing. After mixing, the primary rubber compound is discharged through the discharge port and enters the conveying mechanism of the calendering equipment for sheet forming.

[0033] Step SS02: Vulcanization. This is a crucial step in imparting the final properties of the rubber material. The calendered mixed rubber block is fed into a vulcanization mold with multi-temperature zone control. The hydraulic system of the vulcanizing machine provides a strong clamping force, driving the mold holder to completely fill the mold cavity of the forming frame with the rubber compound, ensuring the geometric accuracy of the conveyor belt. After the heating system is activated, it outputs controlled heat energy to drive the rubber molecules to undergo a complex cross-linking reaction. (Degree of vulcanization) Control no longer relies solely on experience and time, but rather on formulas. Dynamic fitting and real-time monitoring are performed. Among these... This is the reaction rate constant, which is corrected by the real-time in-mold temperature; This refers to the vulcanization time; An index reflecting the complexity of the sulfidation reaction.

[0034] Once the first stage of vulcanization reaches the preset crosslinking density threshold, the rotation mechanism inside the vulcanizing machine drives the entire mold to rotate 90 degrees. This rotation aims to eliminate component segregation caused by gravity, resulting in a more uniform filler distribution. The material is then transferred to the second stage vulcanization zone. In this zone, an infrared heating module replaces the traditional plate heating, providing non-contact, deep heating of the rubber material, rapidly raising the internal temperature to the secondary reaction temperature. During this temperature rise, the rubber molecular chains undergo intense thermal motion and spatial reorganization due to the energy injection. This process is specifically designed to rotate the molecular chains 180 degrees upwards in microscopic orientation to eliminate residual internal stress generated during the first stage of vulcanization.

[0035] After vulcanization, online monitoring equipment uses ultrasonic or infrared spectroscopy to perform non-destructive sampling and analysis of properties such as vulcanization uniformity and tensile strength of the finished product. Based on the monitoring feedback, the central control unit pushes the finished product to the finished product collection area through a precise pushing mechanism. If the detected performance indicators exceed the tolerance range, the pushing mechanism pushes the defective product into the substandard product processing area for recycling.

[0036] In specific embodiments, the rubber material of the present invention exhibits superior performance. In a typical heat resistance test scenario, a conveyor belt made of the material of the present invention was exposed to continuous hot air at 250 degrees Celsius. Due to the presence of the modified insulating layer, the degradation initiation temperature of the internal EPDM rubber was increased by approximately 45 degrees Celsius compared to ordinary EPDM rubber. The reinforcing carrier frame, through its centripetal structure, provides additional restraint when the conveyor belt elongates due to heat, enabling the material to maintain a high-temperature tensile strength retention rate of over 85% after 100 hours of continuous use.

[0037] Meanwhile, due to the controlled-release function of the antioxidant coating layer on the core surface of the nano-silica, the material's ozone aging resistance remains stable throughout its service life, without the problem of excessive antioxidant blooming in the early stage followed by insufficient blooming later. Under high-temperature pulse impact (such as when transporting incandescent sintered ore), the chemical shielding response generated by the heat-resistant carrier and auxiliary stabilizing side chains rapidly absorbs the impact energy. Actual measurement data shows that the local instantaneous temperature rise of 280 degrees Celsius is rapidly dissipated through the heat dissipation guide pipe, with a heat dissipation rate 35% higher than that of traditional rubber materials.

[0038] Furthermore, the mechanical entanglement between the flexible molecular chains and the vulcanized gain ring structure in the crosslinking control system significantly extends the fatigue life of the material during reciprocating bending motion. In simulated conveyor belt roller winding tests, the onset of surface cracks was delayed by more than 5000 working cycles. The stress relief unit activates when the local temperature difference reaches 50 degrees Celsius, successfully preventing interlayer delamination caused by excessive local stress.

[0039] This multi-level, multi-functional structural design, combined with a precise manufacturing process, systematically solves a series of technical defects in high-temperature conveyor belts under extreme and complex working conditions, such as poor thermo-oxidative stability, easy degradation, easy cracking, and short service life, by addressing multiple dimensions including molecular chain protection, directional distribution of fillers, active heat dissipation, intelligent adjustment of cross-linking networks, and dynamic optimization of the manufacturing process. This invention is not only applicable to high-temperature material conveying in industries such as metallurgy and building materials, but its structural design concept can also be extended to other special rubber product fields with stringent requirements for heat resistance and mechanical strength. In practical applications, by fine-tuning the ratio of EPDM rubber to the modified isolation layer and optimizing the weights of each component in the reinforcing filler system, high-temperature conveyor belt products that meet different specific temperature requirements can be further customized for production.

[0040] To further verify the technical advantages of this invention, a set of comparative experiments were conducted. The experimental group adopted the structure and formulation described in the above embodiments, while the control group was prepared using equal amounts of EPDM rubber, carbon black, and common antioxidants according to a conventional mixing and vulcanization process. In the same 300°C high-temperature thermo-oxidative aging test, the control group showed obvious hardening and deep cracks on the surface after 24 hours, with a 60% decrease in tensile strength; while the experimental group maintained good elasticity on the surface after 72 hours, with no visible cracks, and a tensile strength decrease of only 12%. This data intuitively demonstrates the synergistic protective effect of the molecularly controlled network, cross-linking bridging framework, and heat-resistant load-bearing structure components in this invention under extreme environments. This perfect combination of microstructure and macroscopic process establishes the technological leadership of this invention in the field of high-temperature resistant rubber materials.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rubber material for a high-temperature resistant conveyor belt, comprising a rubber matrix, characterized in that: It also includes a reinforcing filler system, which uniformly disperses active reinforcing particles in the rubber matrix to improve the mechanical strength of the material skeleton. The system comprises a heat-resistant modified structure, in which surface-modified heat-resistant additives are implanted between the molecular chains of the rubber matrix, sequentially passing through a free radical capture stage, a thermo-oxidative degradation inhibition stage, a crosslinking network stabilization stage, and a surface crack protection stage; a coupling reinforcement component disposed on the micro-interface of the rubber matrix, which chemically bonds the reinforcing filler system to the rubber matrix; a crosslinking control system disposed during the vulcanization reaction process, which synergistically induces vulcanization and regulates the thermal stability of the rubber material; and an anti-aging component disposed on the surface of the material, used to adjust the surface of the rubber material from a thermo-oxidative active state to a thermo-oxidative passivated state after heating.

2. The rubber material for a high-temperature resistant conveyor belt according to claim 1, characterized in that: The rubber matrix includes EPDM rubber, and a modified isolation layer is coated on the EPDM rubber. The modified isolation layer provides thermal insulation protection for the matrix. The mass ratio of the EPDM rubber to the modified isolation layer is 80:1.5-2.

5. A first activity index additive is added to the rubber matrix at the position corresponding to the reinforcing filler system. The first activity index additive is blended and connected with a reinforcing carrier frame. The reinforcing carrier frame pulls the functional components in the reinforcing filler system towards the center of the rubber matrix one by one.

3. The rubber material for a high-temperature resistant conveyor belt according to claim 2, characterized in that: The reinforcing filler system includes activated carbon black and a nano-silica core rotatably connected between rubber molecular chains and driven by surface functional groups. The nano-silica core is modified with four active grafting sites, and each active grafting site has a silane coupling link fixedly adsorbed at its bottom. The silane coupling link is reacted in a controlled manner at the mixing station through a heat-resistant modified structure. Metal oxide particles are fixedly adsorbed on the nano-silica core. Three symmetrically arranged anchoring adsorption groups are installed on the metal oxide particles. Antioxidant coating layers are fixedly installed on two of the anchoring adsorption groups. The antioxidant coating layers encapsulate the micro-interfaces of the reinforcing filler system at the mixing station.

4. The rubber material for a high-temperature resistant conveyor belt according to claim 3, characterized in that: The heat-resistant modified architecture includes a heat-resistant carrier dispersed on a rubber matrix and driven by a vulcanization reaction. A main antioxidant functional ring is fixedly installed on the heat-resistant carrier. A first anti-aging connecting shaft is chemically bonded to the rubber matrix at a position corresponding to the main antioxidant functional ring. An auxiliary stabilizing side chain is fixedly installed on the first anti-aging connecting shaft. The auxiliary stabilizing side chain works synergistically with the main antioxidant functional ring. The heat-resistant carrier can undergo a chemical shielding response with the auxiliary stabilizing side chain at a high-temperature pulse station.

5. The rubber material for a high-temperature resistant conveyor belt according to claim 4, characterized in that: The reinforcing filler system also includes a thermally conductive filler and a fatigue-resistant reinforcing agent that are blended and connected with the rubber matrix, and a heat dissipation guiding pipe that is physically connected to the thermally conductive filler. A diffusion microporous structure that communicates with the inner cavity of the antioxidant coating layer is fixedly opened on the nano-silica core. The bottom end of the diffusion microporous structure is fixedly connected to the heat dissipation guiding pipe. The thermally conductive filler has heat-absorbing buffer holes at the positions corresponding to the high-temperature impact points. The active end of the fatigue-resistant reinforcing agent is connected to the heat-absorbing buffer holes. The heat dissipation guiding pipe is connected to stress relief units at the positions corresponding to surface crack points, thermal degradation points, and excessive cross-linking points.

6. The rubber material for a high-temperature resistant conveyor belt according to claim 5, characterized in that: The crosslinking control system includes co-curing centers disposed during the vulcanization stage. The co-curing centers are diffusely distributed and chemically bonded with a co-accelerator. An active excitation drive shaft is rotatably connected to the co-accelerator. A vulcanization gain ring structure is fixedly mounted on the active excitation drive shaft. A certain amount of zinc salt is mounted on the rubber matrix. The vulcanization gain ring structure can undergo a complexation reaction with the certain amount of zinc salt after vulcanization to a set temperature. A crosslinking bridge is mounted at the end of the active excitation drive shaft. Flexible molecular chains are physically connected to the inner wall of the crosslinking bridge. A thermal stabilizer is fixedly mounted on the crosslinking bridge. A stress-absorbing end is fixedly connected to the bottom end of the flexible molecular chain. The thermal stabilizer is connected to the stress-absorbing end through the molecular chain. The flexible molecular chain is physically entangled with the vulcanization gain ring structure through a linkage entanglement element.

7. The rubber material for a high-temperature resistant conveyor belt according to claim 6, characterized in that: The linkage entanglement component includes a second chemical bond connecting shaft adsorbed and connected to the cross-linking bridging frame. A passive functional inducing group that is driven and connected to the sulfurized gain ring structure is fixedly installed at the tail end of the second chemical bond connecting shaft. Follower induced binding sites are fixedly installed at the front end of the second chemical bond connecting shaft and on the flexible molecular long chain. The two follower induced binding sites are hydrogen bonded to each other.

8. The rubber material for a high-temperature resistant conveyor belt according to claim 7, characterized in that: The anti-aging component includes two physical protective barriers and two chemical trapping units. The two physical protective barriers and the two chemical trapping units are fixedly connected to the surface of the rubber matrix. The positions of the two physical protective barriers and the two chemical trapping units correspond to the surface cracking sites and the thermo-oxidative aging sites, respectively. A second structural reinforcement module is installed on the physical protective barrier, and a dense protective film layer is chemically connected to the second structural reinforcement module.

9. The rubber material for a high-temperature resistant conveyor belt according to claim 8, characterized in that: The coupling enhancement component includes an active reference plate fixedly connected to a rubber matrix. An organosilane sensing head and a metal chelation response end are respectively installed on the active reference plate. A molecular central control network electrically connected to the organosilane sensing head and the metal chelation response end is fixedly installed on the surface of the rubber matrix.

10. A method for preparing a rubber material for a high-temperature resistant conveyor belt according to any one of claims 1-9, characterized in that, Includes the following steps: SS01. Mixing: Before the preparation operation, the internal mixer is connected to the hopper containing the batch of material components. The internal mixer feeds the rubber compound containing the batch of components one by one to the mixing station. The discharge port of the primary rubber compound is connected to the conveying mechanism of the next stage calendering equipment for rubber materials. During the mixing process, the amount of each component added satisfies the formula... And downgrade non-standard rubber compounds; SS02, vulcanization: After the mixture containing batches of rubber components is fed into the vulcanization station, the vulcanization pressure, in conjunction with the mold press, forces the rubber material in the mold cavity one by one against the molding frame at the vulcanization station. A heating source drives the rubber material to react, and the degree of vulcanization... Follow the formula After the rubber material is vulcanized in the first stage, the indexing mechanism rotates 90° and sends the vulcanized rubber material into the second stage vulcanization stage. After the rubber material is sent into the second stage vulcanization stage, the infrared heating module drives the rubber material to rise to the set temperature. During the process of the rubber material rising to the set temperature, the rubber molecular chains automatically arrange and recombine 180°. After the detection is completed, the central control host uses the positive and negative performance monitoring results of the rubber material to push the vulcanized rubber material out of the finished product collection area or the defective product processing area.

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