High-wear-resistance rubber roller and preparation method thereof

Abstract

The rubber roller is prepared by mixing natural rubber, nitrile rubber, modified nano carbon fibers, nano silicon dioxide, graphene oxide, a modified silane coupling agent, a vulcanizing agent, an accelerant, an anti-aging agent and a plasticizer according to a specific proportion and carrying out banburying, mixing, directional stretching, dual vulcanization and surface treatment. By introducing the surface-modified nano filler and the modified silane coupling agent, uniform dispersion and interface chemical bonding of the filler in a rubber matrix are realized, and a synergistically enhanced network structure is constructed. Directional stretching is combined with a two-stage vulcanization process to form an interpenetrating structure of a covalent cross-linked network and an inorganic-organic interface network, so that the wear resistance, the structural stability and the fatigue life of the rubber roller are remarkably improved. The method is controllable in process, suitable for industrial batch preparation and good in application prospect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rubber roll processing, in particular to a high wear-resistant rubber roll and a preparation method thereof. BACKGROUND

[0002] Rubber rolls are widely used in printing, papermaking, textile, conveying and other industrial equipment as key contact and transmission components, and their performance directly affects the working stability of the equipment and the product quality. Under harsh working conditions such as high friction, high temperature and high load, the rubber roll is subject to serious wear, aging and fatigue failure problems, and traditional rubber roll materials are difficult to meet the requirements of long-term stable operation.

[0003] In the prior art, natural rubber or nitrile rubber is often used as the base material, and inorganic fillers such as carbon black and white carbon black are added to improve the mechanical properties and wear resistance. However, the traditional inorganic fillers are mostly dispersed in the rubber in a physical way, and there is a lack of effective interfacial bonding between the rubber chains, which can easily form interfacial debonding or micro-crack propagation at stress concentration sites, leading to performance degradation of the rubber roll and shortening of the service life. In addition, under high temperature environment, the rubber molecular chain is prone to thermal oxidative aging, resulting in a decrease in elastic modulus and a decrease in elongation at break, further increasing the failure risk of the rubber roll.

[0004] In recent years, the introduction of nanomaterials has provided a new way for rubber reinforcement. Nanofillers such as nanocarbon fibers, nanosilica and graphene oxide have excellent mechanical properties, thermal stability and surface activity, and can significantly improve the comprehensive performance of the rubber matrix by constructing a three-dimensional synergistic reinforcement network. However, the related technology still faces two key bottlenecks in practical application: first, the nanofillers are prone to agglomeration and difficult to disperse, and the interfacial bonding ability with the rubber matrix is poor, making it difficult to fully exert its reinforcing effect; second, the nanofillers are mostly physically embedded between the rubber chains, lacking chemical bonding, resulting in low interfacial shear strength and poor stress transfer efficiency.

[0005] Therefore, there is an urgent need for a high wear-resistant rubber roll and a preparation method thereof to solve the above problems. SUMMARY

[0006] The present application aims to solve the technical problems raised in the background art, and provides a high wear-resistant rubber roll and a preparation method thereof. The above-mentioned purpose of the present application is achieved as follows: A high wear-resistant rubber roll is prepared from the following raw materials by weight: Natural rubber: 45-75 parts; Nitrile rubber: 15-35 parts; Modified nanocarbon fiber: 5-10 parts; Graphene oxide: 0.5-3 parts; Modified silane coupling agent: 2-4 parts; Vulcanizing agent: 1.5-2.0 parts; Accelerator: 0.8-1.0 parts; Antioxidant: 1-1.5 parts; Plasticizer: 3-4 parts; Nano-silica: 8-15 parts; The rubber roller has a double vulcanization structure of a covalent crosslinking network and an inorganic-organic interface network interpenetrating, the modified nanocarbon fiber, the nano-silica and the graphene oxide are uniformly dispersed in the rubber matrix and are connected with the rubber chain through the modified silane coupling agent to form a chemical bond, and the interface bonding energy is 50 J / m².

[0007] As a preferred technical solution of the application, the modified nanocarbon fiber is treated by oxygen plasma or chemical carboxylation / ammoniation, and the surface is provided with hydroxyl, carboxyl or amino functional groups; the modified silane coupling agent is N-(β-aminoethyl)-γ-aminopropyl trimethoxysilane; the vulcanizing agent is sulfur, the accelerator is N-cyclohexyl-2-benzothiazole sulfenamide, the antioxidant is 2,2,4-trimethyl-1,2-dihydroquinoline polymer, and the plasticizer is dioctyl phthalate.

[0008] As a preferred technical solution of the application, in the microstructure of the rubber roller, the modified nanocarbon fiber, the nano-silica and the graphene oxide are intertwined in a grid shape, form a gradient transition layer with the modified silane coupling agent, and prevent the microcracks from expanding to the main rubber.

[0009] As a preferred technical solution of the application, the rubber roller has a dense network structure formed by synergistic enhancement of the modified nanocarbon fiber, the nano-silica and the graphene oxide.

[0010] As a preferred technical solution of the application, when the rubber roller operates under high friction and high temperature conditions, the interface layer reduces local stress concentration through the multi-scale sliding and stress dissipation mechanism of the nano-filler, thereby delaying material fatigue damage.

[0011] The application further provides a method for preparing a high-wear-resistance rubber roller. S1: natural rubber and nitrile rubber are added into a mixer in a weight ratio of 45-75 parts to 15-35 parts, and are mixed at 75-105°C for 4-10 minutes to obtain a preliminary mixed rubber; S2: the nanocarbon fiber is treated by plasma surface treatment or chemical modification, and is ultrasonically dispersed with the nano-silica and the graphene oxide in a modified silane coupling agent solution for 10-30 minutes to obtain a surface-activated nano-filler mixture, and the mixture is added into the preliminary mixed rubber under the condition of 75-115°C, and is continuously mixed for 8-15 minutes to make the filler The nanofillers form three-dimensional network structure in the rubber matrix and realize interface chemical bonding; S3: adding vulcanizing agent, accelerator, antioxidant and plasticizer to the rubber compound obtained in step S2 on an open mill, and increasing the length of the rubber compound by 1.0-1.8 times relative to the original length by applying a controlled tensile force along the processing direction, and repeatedly mixing for 5-8 minutes, so that the rubber molecular chain and the nanofillers are oriented along the stress direction; S4: extruding or calendering the rubber compound obtained in step S3 at 110-150°C, and then sequentially performing first-stage hot press vulcanization and second-stage dynamic hot air vulcanization, the first-stage vulcanization temperature being 150-170°C, the time being 15-30 minutes, the second-stage vulcanization temperature being 90-130°C, and the time being 1-4 hours, so as to form a double vulcanization structure in which a covalent crosslinking network induced by a vulcanizing agent and an inorganic-organic interface network induced by a silane coupling agent are interpenetrated; S5: performing nitrogen plasma surface treatment on the vulcanized rubber roller for 2-5 minutes, and then performing surface grinding and ultrasonic cleaning, to obtain a high-wear-resistance rubber roller.

[0012] As a preferred technical solution of the present application, the nanocarbon fibers in S2 are treated by oxygen plasma for 5-10 minutes or chemically carboxylated / amidated, so that hydroxyl, carboxyl or amino functional groups are introduced onto the surface, and covalent bonding is formed between the rubber segments and the modified silane coupling agent under the action of the modified silane coupling agent, so that the interface bonding strength is increased to more than 50 J / m².

[0013] As a preferred technical solution of the present application, the nanosilica and graphene oxide in S2 are dispersed by mechanical shearing and ultrasonic wave, so that the particle size of the nanosilica is maintained at 10-30 nm, the single-layer rate of the graphene oxide is not less than 90%, the overall dispersion index is controlled to be less than 1.5, and the weight ratio of the nanocarbon fibers to the nanosilica is 0.3-0.8.

[0014] As a preferred technical solution of the present application, the stretching force for the directional stretching mixing in step S3 is 1.2-1.5 times the original length, so that a multi-scale stress transfer network is formed between the rubber segments and the nanofillers, and the stress transfer efficiency is increased by more than 20%.

[0015] As a preferred technical solution of the present application, the double vulcanization network in step S4 comprises a mixed crosslinking structure of silicon-oxygen bonds and carbon-silicon bonds, and the crosslinking density is 0.1-0.3 mol / cm³; and the nitrogen plasma treatment time in step S5 is 3-4 minutes, so as to improve the surface hardness and corrosion resistance.

[0016] Beneficial effects: The nano-carbon fiber, nano-silica and graphene oxide modified by plasma or chemical method form a dense network structure in the rubber matrix through ultrasonic dispersion and coupling agent guidance. This network not only improves the uniformity of filler distribution, but also realizes chemical bonding with the rubber chain segment, significantly improving the overall synergistic reinforcing ability of the composite system, avoiding the interface peeling and performance degradation problems caused by traditional physical mixing of fillers.

[0017] During the mixing process, a controlled tensile force is applied to make the nano-filler and the rubber chain form an oriented structure in the stress direction, building an efficient stress transfer path; at the same time, a two-stage process of hot pressing and dynamic hot air vulcanization is adopted to introduce a covalent crosslinking network and inorganic-organic interface network interpenetrating structure in the rubber matrix, enhancing the thermal stability and fatigue durability of the rubber.

[0018] The addition sequence of each raw material is clear, the process parameters are controllable, the surface treatment method is efficient and reliable, and it is easy to implement on the conventional rubber product production line. At the same time, this method does not depend on special equipment or rare additives, and is suitable for the manufacturing needs of multiple types of rubber rollers, and can be widely applied in printing, papermaking, conveying and other fields, and has good application prospect. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below. It should be understood that the specific examples described herein are only used to explain the present application and not to limit the present application.

[0020] The present application provides a high wear-resistant rubber roller and a preparation method thereof. By optimizing the rubber matrix formula, nano-filler modification and double vulcanization network structure design, the wear resistance, high temperature resistance and fatigue resistance of the rubber roller are significantly improved. The technical scheme of the present application is further described below through specific examples and comparative examples, but the protection scope of the present application is not limited thereto.

[0021] Example 1: Prepare a high wear-resistant rubber roller according to the following steps: S1: Prepare the initial rubber mixture: Add 60 parts of natural rubber and 25 parts of nitrile rubber into the internal mixer, and mix at 90°C for 6 minutes to obtain a uniform initial rubber mixture.

[0022] S2: Nanofiller modification and mixing: Take 7 parts of carbon nanofiber, treat it with oxygen plasma for 8 minutes to introduce hydroxyl and carboxyl functional groups on the surface; add the modified carbon nanofiber, 10 parts of nano-silica (particle size 15 nm) and 1.5 parts of graphene oxide (single layer rate 92%) into an ethanol solution containing 3 parts of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane (modified silane coupling agent), ultrasonic dispersion for 20 minutes to obtain a surface-activated nanofiller mixture. The weight ratio of carbon nanofiber to nano-silica is 0.7. Add the mixture to the initial rubber at 95°C and continue mixing for 10 minutes to uniformly disperse the fillers and form chemical bonds between the silane coupling agent and the rubber chains, with an interfacial bonding energy of 52 J / m².

[0023] S3: Additives and directional stretching: Transfer the mixing rubber obtained in step S2 to an open mill, and add 1.8 parts of sulfur (vulcanizing agent), 0.9 parts of N-cyclohexyl-2-benzothiazole sulfenamide (accelerator), 1.2 parts of 2,2,4-trimethyl-1,2-dihydroquinoline polymer (antioxidant), and 3.5 parts of dioctyl phthalate (plasticizer) in sequence. Increase the length of the rubber by 1.4 times by applying a tensile force along the processing direction, and repeat the mixing for 6 minutes to orient the rubber molecular chains and nanofillers along the stress direction.

[0024] S4: Molding and double vulcanization: The mixing rubber obtained in step S3 is calendered at 130°C, and then subjected to two-stage vulcanization: the first stage is hot press vulcanization at 160°C for 20 minutes; the second stage is dynamic hot air vulcanization at 110°C for 2 hours, forming a double-vulcanized structure of covalently cross-linked network (cross-linking density 0.2 mol / cm³) and inorganic-organic interfacial network induced by silane coupling agent.

[0025] S5: Surface treatment: Nitrogen plasma treatment of the vulcanized rubber roller for 3.5 minutes, followed by surface grinding and ultrasonic cleaning to obtain a high wear-resistant rubber roller.

[0026] Example 2: Prepare a high wear-resistant rubber roller according to the following steps: S1: Preparation of initial rubber: Add 70 parts of natural rubber and 20 parts of nitrile rubber to a mixing mill and mix at 100°C for 8 minutes to obtain an initial rubber.

[0027] S2: Nanofiller modification and mixing: Take 8 parts of nanocarbon fibers and introduce carboxyl functional groups on the surface through chemical carboxylation treatment; add the modified nanocarbon fibers, 12 parts of nanosilica (particle size 20nm) and 2 parts of graphene oxide (monolayer rate 95%) to an ethanol solution containing 3.5 parts of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane and ultrasonically disperse for 25 minutes to obtain a surface-activated nanofiller mixture. The weight ratio of nanocarbon fibers to nanosilica is 0.67. The mixture is added to the primary rubber mix at 100°C and continued to be mixed for 12 minutes. The interfacial bonding energy reaches 55J / m².

[0028] S3: Adding additives and directional stretching: The rubber mix from step S2 was transferred to an open mill and 1.9 parts of sulfur, 0.95 parts of N-cyclohexyl-2-benzothiazolesulfenamide, 1.3 parts of 2,2,4-trimethyl-1,2-dihydroquinoline polymer, and 3.8 parts of dioctyl phthalate were added in sequence. A stretching force was applied to increase the length of the rubber mix by 1.5 times, and the mixing was repeated for 7 minutes.

[0029] S4: Molding and dual vulcanization: The rubber mixture obtained in step S3 was extruded at 140°C and then vulcanized in two stages: the first stage was hot press vulcanization at 165°C for 25 minutes; the second stage was dynamic hot air vulcanization at 120°C for 3 hours, with a crosslink density of 0.25 mol / cm³.

[0030] S5: Surface treatment: The vulcanized rubber roller is subjected to nitrogen plasma treatment for 4 minutes, followed by surface grinding and ultrasonic cleaning to obtain a highly wear-resistant rubber roller.

[0031] Example 3: Prepare a high wear-resistant rubber roller according to the following steps: S1: Preparation of primary rubber mix: 50 parts of natural rubber and 30 parts of nitrile rubber were mixed at 85°C for 7 minutes to obtain primary rubber mix.

[0032] S2: Nanofiller modification and mixing: 6 parts of nanofiber were chemically aminated to introduce amino groups onto the surface. The modified nanofiber, 12 parts of nanosilica (10 nm particle size), and 1 part of graphene oxide (90% monolayer ratio) were added to an ethanol solution containing 2.5 parts of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane. Ultrasonic dispersion was performed for 15 minutes (300 W power) to achieve a dispersion index of 1.3 and a nanofiber to nanosilica weight ratio of 0.5. The mixture was added to the primary rubber mix at 90°C and banburyed for 10 minutes. The interfacial binding energy was 50 J / m².

[0033] S3: Additives and directional stretching: Add 1.7 parts of dicumyl peroxide (DCP), 0.8 parts of TMTD (accelerator), 1.1 parts of 2,2,4-trimethyl-1,2-dihydroquinoline polymer, and 3.2 parts of dioctyl phthalate, and stretch the rubber compound to 1.3 times its original length. Mix for 6 minutes.

[0034] S4: Molding and double vulcanization: Extrusion molding at 135°C, first stage 165°C hot press vulcanization for 18 minutes, second stage 115°C dynamic hot air vulcanization for 2.5 hours, crosslinking density 0.22 mol / cm³.

[0035] S5: Surface treatment: Nitrogen plasma treatment for 3 minutes (vacuum degree 0.3 Pa, power 120 W), followed by sanding and ultrasonic cleaning.

[0036] Comparative Example 1: To compare the performance of the invention, a rubber roller was prepared using a traditional formula without adding modified nanocarbon fibers and graphene oxide. The specific steps are as follows: S1: Preparation of initial rubber compound: Mix 80 parts of natural rubber and 20 parts of nitrile rubber at 90°C for 6 minutes to obtain the initial rubber compound.

[0037] S2: Mixing: Directly add 15 parts of unmodified nanosilica to the initial rubber compound and mix at 95°C for 10 minutes.

[0038] S3: Additives: Transfer the mixed rubber obtained in step S2 to an open mill, add 1.8 parts of sulfur, 0.9 parts of N-cyclohexyl-2-benzothiazole sulfenamide, 1.2 parts of 2,2,4-trimethyl-1,2-dihydroquinoline polymer, and 3.5 parts of dioctyl phthalate, and mix repeatedly for 6 minutes (without directional stretching).

[0039] S4: Molding and vulcanization: The mixed rubber obtained in step S3 is calendered at 130°C and hot press vulcanized at 160°C for 20 minutes.

[0040] S5: Surface treatment: Perform conventional sanding and cleaning on the vulcanized rubber roller.

[0041] Comparative Example 2: Compared with Example 1, omit the graphene oxide and directional stretching steps: S1-S2: Same as Example 1, but without adding graphene oxide.

[0042] S3: Add 1.8 parts of sulfur, 0.9 parts of N-cyclohexyl-2-benzothiazole sulfenamide, 1.2 parts of antioxidant, and 3.5 parts of plasticizer, and mix conventionally for 6 minutes (without stretching).

[0043] S4-S5: Same as Example 1.

[0044] The rubber rolls prepared in the above examples and comparative examples were tested, and the test items included: Wear resistance: DIN abrasion test (GB / T9867-2008), test the wear amount (mm³).

[0045] Tensile strength: GB / T528-2009 standard.

[0046] Fatigue life: record the crack appearance time (hours) under high temperature (100°C) and high friction (10N, 5Hz, 10^5 cycles).

[0047] Interfacial bonding energy: interfacial peeling test (J / m²).

[0048] Heat aging resistance: 100°C aging for 72 hours (GB / T3512-2014), test the tensile strength retention rate.

[0049] Dynamic friction coefficient: test under the condition of 10N and 5Hz.

[0050] Based on the performance data of examples 1-3 and comparative examples 1-2, the high wear-resistant rubber roll of the application is significantly superior to the traditional rubber roll in wear resistance, mechanical properties, fatigue resistance and heat aging resistance. The following is a detailed analysis from the perspective of structure-property relationship: Wear resistance: the wear amount of examples 1-3 (40-48mm³) is reduced by 60-66.7% and 46.7-55.6% respectively compared with comparative example 1 (120mm³) and comparative example 2 (90mm³). This is due to the synergistic reinforcing effect of modified nanocarbon fiber, nanosilica and graphene oxide, forming a dense network structure and effectively dispersing frictional stress.

[0051] The wear amount of example 2 is the lowest (40mm³), which is attributed to the higher content of graphene oxide (2 parts) and the optimized dispersion index (1.1), which makes the nanofiller form a more uniform grid-like winding structure.

[0052] Comparative example 1 lacks modified nanofiller and graphene oxide, resulting in the highest wear amount; comparative example 2 has modified nanocarbon fiber, but lacks graphene oxide and directional stretching, so the wear resistance is still poor.

[0053] Tensile strength: the tensile strength of examples 1-3 (24.8-26.8MPa) is increased by 36.3-47.3% and 21-30.7% respectively compared with comparative example 1 (18.2MPa) and comparative example 2 (20.5MPa). The modified silane coupling agent (N-(β-aminoethyl)-γ-aminopropyl trimethoxysilane) enhances the interfacial bonding energy between the nanofiller and the rubber matrix (50-55J / m² vs 30-40J / m²) through chemical bonding.

[0054] The tensile strength of Example 2 is the highest, possibly due to the higher crosslinking density (0.25 mol / cm3) and stronger interfacial bonding energy (55 J / m2). Example 3 uses peroxide vulcanizing agent (DCP), which slightly reduces the tensile strength (24.8 MPa), but still outperforms the comparative examples, indicating that the type of vulcanizing agent has limited impact on the performance.

[0055] Fatigue life: The fatigue life of Examples 1-3 (1400-1600 h) is extended by 75-100% and 40-60% compared to Comparative Example 1 (800 h) and Comparative Example 2 (1000 h), respectively. The multi-scale slip and stress dissipation mechanism mentioned in Claim 5 effectively prevents micro-crack propagation through the gradient transition layer of the nano-filler.

[0056] Example 2 has the longest fatigue life (1600 h), benefiting from the higher nano-filler content and directional stretching (1.5 times the original length), which forms an efficient stress transfer network between the rubber segments and the filler, improving the stress transfer efficiency by about 25%.

[0057] Comparative Example 2 has a lower fatigue life than the examples due to the lack of graphene oxide and directional stretching, indicating that graphene oxide is crucial for stress dissipation in the interfacial layer.

[0058] Heat aging resistance: The tensile strength retention rate of Examples 1-3 (90-94%) is significantly higher than that of Comparative Example 1 (75%) and Comparative Example 2 (82%). The anti-aging agent (2,2,4-trimethyl-1,2-dihydroquinoline polymer) and the dual vulcanization network (siloxane and carbon-silicon bond crosslinking) enhance the stability of molecular chains at high temperatures.

[0059] Example 2 has the highest retention rate (94%), possibly related to the higher content and uniform dispersion of graphene oxide (single-layer rate 95%), reducing the chain segment breakage caused by thermal oxidative aging.

[0060] Dynamic friction coefficient: The dynamic friction coefficient of Examples 1-3 (0.43-0.47) is lower than that of Comparative Example 1 (0.60) and Comparative Example 2 (0.55), indicating that surface modification and uniform dispersion of nano-filler reduce surface stickiness and enhance anti-slippage ability.

[0061] Example 2 has the lowest friction coefficient (0.43), attributed to the optimization of surface roughness and chemical activity by nitrogen plasma treatment.

[0062] Microstructure and performance relationship: SEM and TEM analysis shows that modified nano-carbon fiber, nano-silicon dioxide and graphene oxide in Examples 1-3 form a grid-like entangled structure, with a gradient transition layer formed by modified silane coupling agent, and the interfacial layer thickness is about 10-20 nm. This structure effectively prevents micro-cracks from expanding to the main rubber.

[0063] Comparative Example 1 only contains unmodified nano-silica, lacks chemical bonding and network structure, and the interfacial bonding energy is only 30 J / m², resulting in poor performance. Comparative Example 2 has modified nano-carbon fibers, but no graphene oxide and directional stretching, and the interfacial bonding energy (40 J / m²) and network density are insufficient.

[0064] The present application significantly improves the wear resistance (wear amount reduced by 60-66.7%), tensile strength (increased by 36.3-47.3%), fatigue life (extended by 75-100%) and heat aging resistance (retention rate of 90-94%) of the rubber roll by synergistic reinforcement of modified nano-carbon fibers, nano-silica and graphene oxide, combined with chemical bonding of modified silane coupling agent and double vulcanization network (claim 10, crosslinking density of 0.1-0.3 mol / cm³). The directional stretching process and nitrogen plasma surface treatment further optimize the stress transfer efficiency and surface performance. Compared with traditional rubber rolls (Comparative Example 1), the rubber roll of the present application has a 1.5-2 times longer wear life in high friction and high temperature scenarios such as printing, papermaking and conveying, showing significant industrial application value.

[0065] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A highly wear-resistant rubber roller, characterized in that: The rubber roller is prepared from the following raw materials in parts by weight: Natural rubber: 45-75 parts; Nitrile rubber: 15-35 parts; Modified carbon nanofiber: 5-10 parts; Graphene oxide: 0.5-3 parts; Modified silane coupling agent: 2-4 parts; Vulcanizing agent: 1.5-2.0 parts; Accelerator: 0.8-1.0 parts; Antiaging agent: 1-1.5 parts; Plasticizer: 3-4 parts; Nano silicon dioxide: 8-15 parts; The rubber roller has a dual vulcanization structure in which a covalent cross-linked network and an inorganic-organic interface network interpenetrate each other. Modified nano-carbon fibers, nano-silica and graphene oxide are uniformly dispersed in the rubber matrix and chemically bonded to the rubber chains through a modified silane coupling agent. The interface binding energy is 50 J / m².

2. The high wear-resistant rubber roller according to claim 1, characterized in that: The modified nano-carbon fibers are treated with oxygen plasma or chemically carboxylated / aminated, and have hydroxyl, carboxyl or amino functional groups on their surfaces; the modified silane coupling agent is N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane; the vulcanizing agent is sulfur, the accelerator is N-cyclohexyl-2-benzothiazolesulfonamide, the antioxidant is 2,2,4-trimethyl-1,2-dihydroquinoline polymer, and the plasticizer is dioctyl phthalate.

3. The high wear-resistant rubber roller according to claim 1, characterized in that: In the microstructure of the rubber roller, modified nano-carbon fibers, nano-silicon dioxide and graphene oxide are intertwined in a grid shape, forming a gradient transition layer with the modified silane coupling agent to prevent micro-cracks from extending to the main rubber.

4. The high wear-resistant rubber roller according to claim 1, characterized in that: The rubber roller has a dense network structure formed by synergistic reinforcement of modified nano-carbon fibers, nano-silicon dioxide and graphene oxide.

5. The high wear-resistant rubber roller according to claim 1, characterized in that: When the rubber roller operates under high friction and high temperature conditions, its interface layer reduces local stress concentration through the multi-scale slip and stress dissipation mechanism of nano-fillers, thereby delaying material fatigue damage.

6. A method for preparing the highly wear-resistant rubber roller according to any one of claims 1 to 5, characterized in that: It includes the following consecutive steps: S1: adding natural rubber and nitrile rubber in a weight ratio of 45-75 parts and 15-35 parts respectively into an internal mixer, and mixing at 75-105° C. for 4-10 minutes to obtain a primary rubber mix; S2: After the nano-carbon fiber is surface treated with plasma or chemically modified, it is ultrasonically dispersed in a modified silane coupling agent solution for 10-30 minutes to obtain a surface-activated nano-filler mixture, which is then added to the primary rubber at 75-115°C and continuously mixed for 8-15 minutes to make the filler The material forms a three-dimensional network structure in the rubber matrix and realizes interfacial chemical bonding; S3: adding a vulcanizing agent, an accelerator, an antioxidant, and a plasticizer to the rubber mix obtained in step S2 on an open mill, applying a controlled tensile force along the processing direction to increase the length of the rubber compound by 1.0-1.8 times relative to the original length, and repeatedly mixing for 5-8 minutes to orient the rubber molecular chains and the nanofiller along the stress direction; S4: The rubber mixture obtained in S3 is extruded or calendered at 110-150°C, and then subjected to a first-stage hot press vulcanization and a second-stage dynamic hot air vulcanization, wherein the first-stage vulcanization temperature is 150-170°C and the time is 15-30 minutes, and the second-stage vulcanization temperature is 90-130°C and the time is 1-4 hours, to form a dual vulcanization structure in which a covalent cross-linking network induced by a vulcanizing agent and an inorganic-organic interface network induced by a silane coupling agent interpenetrate; S5: The vulcanized rubber roller is subjected to nitrogen plasma surface treatment for 2-5 minutes, followed by surface grinding and ultrasonic cleaning to obtain a highly wear-resistant rubber roller.

7. The method for preparing a highly wear-resistant rubber roller according to claim 6, characterized in that: The nano-carbon fibers in S2 are treated with oxygen plasma for 5-10 minutes or chemically carboxylated / aminated to introduce hydroxyl, carboxyl or amino functional groups on the surface, and form covalent bonds with the rubber segments under the action of a modified silane coupling agent, thereby increasing the interfacial bonding strength to above 50 J / m².

8. The method for preparing a highly wear-resistant rubber roller according to claim 6, characterized in that: The nano-silica and graphene oxide in S2 are dispersed by mechanical shearing and ultrasonic wave combination, so that the particle size of the nano-silica is maintained at 10-30 nm, the monolayer rate of the graphene oxide is not less than 90%, the overall dispersion index is controlled below 1.5, and the weight ratio of the nano-carbon fiber to the nano-silica is 0.3-0.

8.

9. The method for preparing a highly wear-resistant rubber roller according to claim 6, characterized in that: The stretching force of the directional stretching mixing in step S3 is 1.2-1.5 times the original length, so that the rubber segments and the nanofillers form a multi-scale stress transfer network, improving the stress transfer efficiency by more than 20%.

10. The method for preparing a highly wear-resistant rubber roller according to claim 6, characterized in that: In step S4, the double-sulfurized network includes a mixed cross-linked structure of silicon-oxygen bonds and carbon-silicon bonds, with a cross-linking density of 0.1-0.3 mol / cm³; and in step S5, the nitrogen plasma treatment time is 3-4 minutes.

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