Rubber roller and preparation method thereof

Abstract

The invention belongs to the technical field of rubber rollers, and particularly provides a rubber roller and a preparation method thereof. The rubber roller comprises an outer coating material and a core shaft, the outer coating material is prepared from the following raw materials: nitrile rubber, reinforcing filler, a vulcanization system, zinc oxide, stearic acid, an L-aspartic acid-metal ion complex and a reinforcing agent; the reinforcing agent is prepared from tannic acid, hydroxyethyl methylacrylate and lauryl methacrylate. The rubber roller prepared by the invention has good rebound resilience and wear resistance.

Description

Technical Field

[0001] This application belongs to the field of rubber roller technology, and in particular relates to a rubber roller and its preparation method. Background Technology

[0002] Rubber rollers are an important functional component in industrial production, widely used in the spinning industry. As the core drafting component of spinning machinery, their performance directly determines yarn quality stability, production efficiency, and overall energy consumption. In the spinning process, these rubber rollers play a crucial role in holding fibers and stabilizing drafting, significantly impacting key indicators such as yarn evenness and strength of the finished yarn. The overall performance of rubber rollers is highly dependent on the characteristics of their coating material. The elasticity, abrasion resistance, deformation adaptability, and resilience of the coating material are paramount, requiring it to maintain good adaptability under the harsh conditions of high-speed, high-pressure, and long-term cyclic operation in the spinning process.

[0003] Nitrile rubber (NBR) has become a traditional mainstream material for coating rollers in the spinning industry due to its moderate oil resistance, excellent elasticity, and basic mechanical strength, and is widely used in the industry. Its excellent elasticity ensures that the roller has adequate gripping force on the fibers, reducing fiber slippage during drafting. It also has a certain degree of deformation recovery, which can cope with changes in dynamic loads and maintain the stability of the drafting process. However, due to the inherent material properties of NBR and the special characteristics of spinning conditions, traditional NBR-coated rollers have gradually revealed performance shortcomings in practical applications. Improvements are needed in properties such as wear resistance and resilience to meet the development needs of high-quality spinning.

[0004] Existing technologies for improving the abrasion resistance of spinning rollers mainly employ two methods, both of which suffer from performance imbalances, making it difficult to achieve a comprehensive and synergistic improvement in performance. One method involves adding rigid fillers such as carbon black and silica to the nitrile rubber formulation to enhance abrasion resistance by increasing the matrix hardness, but this significantly weakens the intrinsic elasticity of the rubber, affecting the roller's rebound stability. The other method involves optimizing the composite vulcanization system or adding multifunctional additives to modify the molecular structure, building a more robust chemical network to strengthen abrasion resistance. However, this easily leads to deterioration of the rubber compound's processability, and an excessively rigid network structure can impair the roller's required deformation adaptability and grip elasticity, creating an inherent contradiction of "abrasion resistance improvement at the expense of elasticity." Therefore, research on how to effectively solve these problems and simultaneously ensure the roller's elasticity, deformation adaptability, and rebound stability is essential. Summary of the Invention

[0005] To address the aforementioned problems and further improve the wear resistance and resilience of rubber rollers, this application provides a rubber roller and its preparation method.

[0006] This application first provides a rubber roller, including an outer coating material and a mandrel; the outer coating material is made from raw materials comprising the following parts by weight: 100-120 parts of nitrile rubber, 30-35 parts of reinforcing filler, 3-4 parts of vulcanization system, 2.5-6 parts of zinc oxide, 1-1.5 parts of stearic acid, 1-3 parts of L-aspartic acid-metal ion complex, and 2-4 parts of reinforcing agent; the reinforcing agent is prepared from tannic acid, hydroxyethyl methacrylate, and lauryl methacrylate.

[0007] Furthermore, the L-aspartic acid-metal ion complex is prepared by mixing L-aspartic acid and ferric chloride in an alcohol solvent.

[0008] Furthermore, the preparation method of the reinforcing agent includes the following steps: mixing tannic acid with 2-bromoisobutyryl bromide and reacting them, then adding a catalyst, hydroxyethyl methacrylate, and lauryl methacrylate to carry out a polymerization reaction to obtain the reinforcing agent.

[0009] Furthermore, the mass ratio of tannic acid, hydroxyethyl methacrylate and lauryl methacrylate is (2-2.5):1:(1.2-1.5).

[0010] Furthermore, the polymerization reaction is carried out at a temperature of 60-65°C for 8-10 hours.

[0011] Furthermore, the vulcanization system consists of sulfur and an accelerator.

[0012] Furthermore, the reinforcing filler is at least one of carbon black or silica.

[0013] This application also provides a method for preparing a rubber roller, comprising the following steps: 1) Take nitrile rubber and mix it in an intensive manner. Then add zinc oxide, stearic acid, L-aspartic acid-metal ion complex. After the first stage of mixing, add reinforcing filler and reinforcing agent and carry out the second stage of mixing. Discharge the rubber to obtain masterbatch. After mixing the masterbatch with the vulcanization system, continue to mix and sheet to obtain the outer coating material. 2) The outer coating material is wrapped around the outer surface of the mandrel, and after vulcanization, a rubber roller is obtained.

[0014] Furthermore, in step 1), the temperature of the first mixing stage is 70-85℃, and the time is 3-5 minutes; And / or, the temperature of the second stage of mixing is 70-80℃, and the time is 1-2 minutes.

[0015] Furthermore, in step 2), the vulcanization conditions are: vulcanization for 50-70 minutes at a pressure of 0.3-0.5 MPa.

[0016] Compared with the prior art, this application has the following beneficial effects: 1. The carboxyl and amino groups in the L-aspartic acid-metal ion complex can form coordination structures with iron ions and hydrogen bonds with the nitrile rubber molecular chain, effectively improving the interfacial compatibility between components and inhibiting the separation and aggregation of components.

[0017] 2. The long chains of the amphiphilic polymer brush on the surface of the reinforcing agent are entangled with the rubber skeleton, and the supporting network constructed can quickly disperse stress. The elastic deformation of the polymer brush and the rigid support of the tannic acid matrix can prevent molecular chain slippage, block frictional stress damage, reduce molecular chain breakage and surface wear and shedding, and improve the wear resistance and service life of the material.

[0018] 3. The iron ions in the L-aspartic acid-metal ion complex can act as bridging centers, forming a multi-component coordination structure with the residual phenolic hydroxyl groups on the surface of the reinforcing agent and the nitrile rubber. This retains the reversible dissociation characteristics of the dynamic bonds while avoiding excessive dissociation that could lead to structural collapse, thus constructing a stable dynamic cross-linked network. Under external force, the coordination dynamic bonds involving iron ions reversibly dissociate to release stress and avoid stress concentration. After the external force is removed, the network structure is rapidly reorganized and restored, endowing the material with excellent fatigue resistance and deformation recovery capabilities, strengthening the interfacial bonding between the reinforcing agent and the matrix, improving the efficiency of external force transmission, and further enhancing the resilience of the material. Attached Figure Description

[0019] Figure 1 The figures show the stress data of the outer coating material after vulcanization in Examples 1-3 and Comparative Examples 1-2 of this application. Detailed Implementation

[0020] To make the inventive objectives, technical solutions, and beneficial technical effects of this application clearer, the following detailed description is provided in conjunction with embodiments, clearly and completely describing the technical solutions in the embodiments of this application. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] When using “including,” “having,” and “contains” as described herein, the intention is to cover non-exclusive inclusion, unless an explicit qualifying term such as “only,” “consisting of,” etc., is used, in which case another component may be added.

[0023] The terms "preferred," "more preferably," "better," and "even better" used in this application refer to embodiments of this application that provide certain beneficial effects under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this application. That is, in this application, "preferred," "more preferably," "better," and "even better" are merely descriptions of implementations or embodiments with better effects, but do not constitute a limitation on the scope of protection of this application.

[0024] In this application, terms such as "further," "even more," and "particularly" are used for descriptive purposes and indicate differences in content, but should not be construed as limiting the scope of protection of this application.

[0025] In this application, "at least one" means one or more, such as one, two, or more. "Multiple" or "several" means at least two, such as two, three, etc., and "multi-layered" means at least two layers, such as two layers, three layers, etc., unless otherwise explicitly specified. In the description of this application, "several" means at least one, such as one, two, etc., unless otherwise explicitly specified.

[0026] When a numerical range is disclosed herein, the range is considered continuous and includes the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0027] Unless otherwise specified, all steps in this application may be performed sequentially or randomly. For example, the method comprising steps (a) and (b) indicates that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0028] In this application, "above" or "below" includes the number itself. For example, "below 1" includes 1.

[0029] In this application, room temperature refers to 0-40°C, including but not limited to 10-40°C, or further to 20-30°C.

[0030] The present application will be further illustrated by the following examples, but these examples do not limit the scope of the present application.

[0031] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in this application, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. All reagents or instruments whose manufacturers are not specified are conventional products that can be purchased commercially. In addition to the specific methods, equipment, and materials used in the embodiments, based on the knowledge of the prior art possessed by one of ordinary skill in the art and the description in this application, any prior art methods, equipment, and materials similar to or equivalent to those described, used, or made by the methods, equipment, and materials in the embodiments of this application may be used to implement this application.

[0032] Preparation Example The preparation method of L-aspartic acid-metal ion complex is as follows: Take 30g of L-aspartic acid and 60g of deionized water, mix them, and stir for 30min to obtain solution one; take 20g of ferric chloride hexahydrate and 50g of deionized water, mix them, and stir for 30min to obtain solution two; adjust the temperature of solution one to 5℃, add solution two to solution one at a rate of 1.5mL / min, and add hydrochloric acid at the same time during the addition of solution two to maintain the pH of the system between 2.3 and 2.5. After the addition is completed, continue stirring for 20min, concentrate the resulting mixture under vacuum at room temperature, and freeze dry to obtain L-aspartic acid-metal ion complex.

[0033] Example 1 The rubber roller in this embodiment is made from the following raw materials: 1 kg of nitrile rubber NBR3305E, 1 kg of carboxylated nitrile rubber XNBR3304, 600 g of carbon black, 36 g of sulfur, 24 g of accelerator TS, 20 g of L-aspartic acid-metal ion complex, 40 g of reinforcing agent, 50 g of zinc oxide, 20 g of stearic acid, 100 g of plasticizer dioctyl phthalate, and 10 g of antioxidant RD.

[0034] The preparation method of the reinforcing agent in this embodiment is as follows: Under a nitrogen atmosphere, 100 mL of dimethylformamide was added to a 250 mL flask, followed by 4 g of tannic acid and 5 mL of triethylamine. The mixture was stirred for 30 min. Under an ice-water bath, 1.2 mL of 2-bromoisobutyryl bromide was added at a rate of 0.2 mL / min. After the addition was complete, the mixture was stirred and reacted at room temperature for 10 h. After the reaction was complete, the reaction solution was poured into diethyl ether, allowed to stand, and then centrifuged. The resulting solid component was dried under vacuum and then placed into a 500 mL three-necked flask. 200 mL of dimethylformamide, 2 g of hydroxyethyl methacrylate, and 2.4 g of lauryl methacrylate were added. The mixture was dispersed for 1 h and nitrogen gas was introduced for 20 min. Then, 3 mL of pentamethyldivinyltriamine and 1.2 g of cuprous bromide were added, and nitrogen gas was introduced for another 30 min. The mixture was reacted at 60 °C for 10 h. The resulting reaction solution was poured into a methanol / acetone mixture (methanol to acetone volume ratio of 5:1) to precipitate, and then dried under vacuum at room temperature to obtain the reinforcing agent.

[0035] The method for preparing the rubber roller in this embodiment is as follows: 1) Weigh 1 kg of nitrile rubber NBR3305E and 1 kg of carboxylated nitrile rubber XNBR3304 and put them into an internal mixer for internal mixing at 90℃. After mixing for 3 minutes, add 50 g of zinc oxide, 20 g of stearic acid, 20 g of L-aspartic acid-metal ion complex, and 10 g of antioxidant RD for the first stage of mixing at 70℃ for 5 minutes. Then add 600 g of carbon black, 100 g of plasticizer dioctyl phthalate, and 40 g of reinforcing agent for the second stage of mixing at 70℃ for 2 minutes. After mixing, discharge the rubber at 110℃ to obtain the masterbatch. Then put the masterbatch into an open mill and add 36 g of sulfur and 24 g of accelerator TS. Mix for another 2 minutes, cut the rubber from left to right three times, reduce the roller gap to 2 mm, pass through the thin mill three times, and cut the sheet to obtain the outer coating material. After the outer coating material is left to stand for 4 hours, proceed to the next step. 2) The outer covering material is wrapped around the steel core, and after wrapping with cloth, it is vulcanized for 50 minutes under a pressure of 0.4MPa and a temperature of 140℃. After surface grinding and balance correction, the rubber roller is obtained.

[0036] The L-aspartic acid-metal ion complex in this embodiment was prepared by the preparation example.

[0037] Example 2 The rubber roller in this embodiment is made from the following raw materials: 1 kg of nitrile rubber NBR3305E, 1.4 kg of carboxylated nitrile rubber XNBR3304, 700 g of silica, 40 g of sulfur, 40 g of accelerator TS, 60 g of L-aspartic acid-metal ion complex, 80 g of reinforcing agent, 120 g of zinc oxide, 30 g of stearic acid, 150 g of plasticizer dioctyl phthalate, and 15 g of antioxidant RD.

[0038] The preparation method of the reinforcing agent in this embodiment is as follows: Under a nitrogen atmosphere, 100 mL of dimethylformamide was added to a 250 mL flask, followed by 5 g of tannic acid and 5 mL of triethylamine. The mixture was stirred for 30 min. Under an ice-water bath, 1.4 mL of 2-bromoisobutyryl bromide was added at a rate of 0.2 mL / min. After the addition was complete, the mixture was stirred and reacted at room temperature for 10 h. After the reaction was complete, the reaction solution was poured into diethyl ether, allowed to stand, and centrifuged. The resulting solid component was then vacuum dried and subsequently placed into a 500 mL three-necked flask. Then, 220 mL of dimethylformamide, 2 g of hydroxyethyl methacrylate, and 3 g of lauryl methacrylate were added and dispersed for 1 h. Nitrogen gas was then purged for 20 min. Subsequently, 3 mL of pentamethyldivinyltriamine and 1.3 g of cuprous bromide were added, and nitrogen gas was purged for another 30 min. The mixture was reacted at 65 °C for 8 h. The resulting reaction solution was poured into a methanol / acetone mixture (methanol to acetone volume ratio of 5:1) to precipitate the precipitate. The precipitate was then vacuum dried at room temperature to obtain the reinforcing agent.

[0039] The method for preparing the rubber roller in this embodiment is as follows: 1) Weigh 1 kg of nitrile rubber NBR3305E and 1.4 kg of carboxylated nitrile rubber XNBR3304 and put them into an internal mixer for mixing at 90℃. After mixing for 3 minutes, add 120 g of zinc oxide, 30 g of stearic acid, and 60 g of... L-aspartic acid-metal ion complex, 15g antioxidant RD, were mixed in the first stage at 85℃ for 3 minutes. Then, 700g silica, 150g plasticizer dioctyl phthalate, and 80g reinforcing agent were added for the second stage of mixing at 75℃ for 1.5 minutes. After mixing, the rubber was discharged at 110℃ to obtain the masterbatch. The masterbatch was then fed into a two-roll mill, followed by the addition of 40g sulfur and 40g accelerator TS. The mixture was then mixed for 2 minutes, cut three times from left to right, and the roll gap was reduced to 2mm. The mixture was then passed through a thin sheet three times to obtain the outer coating material. The outer coating material was left to stand for 4 hours before proceeding to the next step. 2) The outer covering material is wrapped around the steel core, and after wrapping with cloth, it is vulcanized for 70 minutes under a pressure of 0.5MPa and a temperature of 130℃. After surface grinding and balance correction, the rubber roller is obtained.

[0040] The L-aspartic acid-metal ion complex in this embodiment was prepared by the preparation example.

[0041] Example 3 The rubber roller in this embodiment is made from the following raw materials: 1 kg of nitrile rubber NBR3305E, 1.1 kg of carboxylated nitrile rubber XNBR3304, 400 g of silica, 250 g of carbon black, 36 g of sulfur, 26 g of accelerator TS, 30 g of L-aspartic acid-metal ion complex, 50 g of reinforcing agent, 70 g of zinc oxide, 28 g of stearic acid, 130 g of plasticizer dioctyl phthalate, and 12 g of antioxidant RD.

[0042] The preparation method of the reinforcing agent in this embodiment is as follows: Under a nitrogen atmosphere, 100 mL of dimethylformamide was added to a 250 mL flask, followed by 4.5 g of tannic acid and 4 mL of triethylamine. The mixture was stirred for 30 min. Under an ice-water bath, 1.2 mL of 2-bromoisobutyryl bromide was added at a rate of 0.2 mL / min. After the addition was complete, the mixture was stirred and reacted at room temperature for 10 h. After the reaction was complete, the reaction solution was poured into diethyl ether, allowed to stand, and then centrifuged. The resulting solid component was dried under vacuum and then placed into a 500 mL three-necked flask. 200 mL of dimethylformamide, 2 g of hydroxyethyl methacrylate, and 2.5 g of lauryl methacrylate were added. The mixture was dispersed for 1 h and nitrogen gas was introduced for 20 min. Then, 3 mL of pentamethyldivinyltriamine and 1.2 g of cuprous bromide were added, and nitrogen gas was introduced for another 30 min. The mixture was reacted at 62 °C for 9 h. The resulting reaction solution was poured into a methanol / acetone mixture (methanol to acetone volume ratio of 5:1) to precipitate, and then dried under vacuum at room temperature to obtain the reinforcing agent.

[0043] The method for preparing the rubber roller in this embodiment is as follows: 1) Weigh 1 kg of nitrile butadiene rubber NBR3305E and 1.1 kg of carboxylated nitrile butadiene rubber XNBR3304 and put them into an internal mixer for mixing at 90℃. After mixing for 3 minutes, add 70 g of zinc oxide, 28 g of stearic acid, and 30 g of... The L-aspartic acid-metal ion complex was first mixed at 80°C for 4 minutes. Then, 400g of silica, 250g of carbon black, 130g of plasticizer dioctyl phthalate, and 50g of reinforcing agent were added for the second mixing stage at 80°C for 1 minute. After mixing, the glue was discharged at 110°C to obtain the masterbatch. The masterbatch was then fed into a two-roll mill, followed by the addition of 36g of sulfur and 26g of accelerator TS. The mixture was then mixed for another 2 minutes, cut three times from left to right, and the roll gap was reduced to 2mm. The mixture was then thinned three times and sheeted to obtain the outer coating material. The outer coating material was left to stand for 4 hours before proceeding to the next step. 2) The outer covering material is wrapped around the steel core, and after wrapping with cloth, it is vulcanized for 1 hour under a pressure of 0.3MPa and a temperature of 140℃. After surface grinding and balance correction, the rubber roller is obtained.

[0044] The L-aspartic acid-metal ion complex in this embodiment was prepared by the preparation example.

[0045] Comparative Example 1 The rubber rollers in this comparative example are made from the following raw materials: 1 kg of nitrile rubber NBR3305E, 1 kg of carboxylated nitrile rubber XNBR3304, 600 g of carbon black, 36 g of sulfur, 24 g of accelerator TS, 20 g of ferric chloride hexahydrate, 40 g of reinforcing agent, 50 g of zinc oxide, 20 g of stearic acid, 100 g of plasticizer dioctyl phthalate, and 10 g of antioxidant RD.

[0046] The preparation method of the rubber roller in this comparative example is as follows: 1) Weigh 20g of ferric chloride hexahydrate, place it in an oven, and dry it at 70℃ for 4 hours. After drying, mix it with 1kg of nitrile rubber NBR3305E and 1kg of carboxylated nitrile rubber XNBR3304, and put it into a mixer for internal mixing at 90℃ for 3 minutes. Then add 50g of zinc oxide, 20g of stearic acid, and 10g of antioxidant RD for the first stage of mixing at 70℃ for 5 minutes. Subsequently, add 600g of carbon black and 100g of... The plasticizer dioctyl phthalate and 40g of reinforcing agent are mixed in the second stage at 70℃ for 2 minutes. After mixing, the rubber is discharged at 110℃ to obtain the masterbatch. The masterbatch is then put into the open mill, followed by the addition of 36g of sulfur and 24g of accelerator TS. The mixture is then mixed for another 2 minutes, cut three times from left to right, and the roller gap is adjusted to 2mm. The mixture is then passed through the thin mill three times to obtain the outer coating material. The outer coating material is left to stand for 4 hours before proceeding to the next step. 2) The outer covering material is wrapped around the steel core, and after wrapping with cloth, it is vulcanized for 50 minutes under a pressure of 0.4MPa and a temperature of 140℃. After surface grinding and balance correction, the rubber roller is obtained.

[0047] The remaining steps are the same as in Example 1.

[0048] Comparative Example 2 The rubber rollers in this comparative example are made from the following raw materials: 1 kg of nitrile rubber NBR3305E, 1 kg of carboxylated nitrile rubber XNBR3304, 600 g of carbon black, 36 g of sulfur, 24 g of accelerator TS, 20 g of L-aspartic acid-metal ion complex, 40 g of tannic acid, 50 g of zinc oxide, 20 g of stearic acid, 100 g of plasticizer dioctyl phthalate, and 10 g of antioxidant RD.

[0049] The preparation method of the rubber roller in this comparative example is as follows: 1) Weigh 1 kg of nitrile rubber NBR3305E and 1 kg of carboxylated nitrile rubber XNBR3304 and put them into an internal mixer for internal mixing at 90℃. After mixing for 3 minutes, add 50 g of zinc oxide, 20 g of stearic acid, 20 g of L-aspartic acid-metal ion complex, and 10 g of antioxidant RD for the first stage of mixing at 70℃ for 5 minutes. Then add 40 g of tannic acid, 600 g of carbon black, and 100 g of plasticizer dioctyl phthalate for the second stage of mixing at 70℃ for 2 minutes. After mixing, discharge the rubber at 110℃ to obtain the masterbatch. Then put the masterbatch into an open mill and add 36 g of sulfur and 24 g of accelerator TS. Mix for another 2 minutes, cut the rubber three times from left to right, reduce the roller gap to 2 mm, pass through the thin mill three times, and cut the sheet to obtain the outer coating material. After the outer coating material is left to stand for 4 hours, proceed to the next step. 2) The outer covering material is wrapped around the steel core, and after wrapping with cloth, it is vulcanized for 50 minutes under a pressure of 0.4MPa and a temperature of 140℃. After surface grinding and balance correction, the rubber roller is obtained.

[0050] The L-aspartic acid-metal ion complex in this comparative example was prepared by the preparation example.

[0051] Performance testing 1. Preparation of specimens: Using a flat vulcanizing machine, the vulcanization temperature is set to 145℃ and the vulcanization time is 60min. The mold is placed on the hot plate of the flat vulcanizing machine. The mold is preheated to the set temperature. Then the outer covering material is placed into the preheated mold for vulcanization to obtain the specimen.

[0052] 2. Hardness test According to standard GB / T531.1-2008, the hardness of the specimens prepared by Examples 1-3 and Comparative Examples 1-2 was tested. Specimens with a thickness greater than 6 mm were placed under a Shore A hardness tester, and the lever next to the hardness tester was activated to bring the indenter into contact with the sample. The hardness of the specimens was then tested, and the test results are shown in Table 1.

[0053] 3. Tensile strength, elongation at break, and stress at a given elongation. Referring to standard GB / T528-2009, the tensile strength, elongation at break, and stress at a given elongation of the specimens prepared in Examples 1-3 and Comparative Examples 1-2 were determined using a universal tensile testing machine. The specimens were dumbbell-shaped standard strips with a thickness of 2 mm, and the tensile speed was 500 mm / min. The test results are shown in Table 1 and... Figure 1 As shown.

[0054] 4. Rebound performance According to standard GB / T1681-2009, the resilience of the specimens prepared by Examples 1-3 and Comparative Examples 1-2 was tested at a test temperature of 25℃ and a specimen thickness of 13mm. The test results are shown in Table 1.

[0055] 5. Abrasion resistance According to the national standard GB / T9867-2008, the wear resistance of the specimens prepared by Examples 1-3 and Comparative Examples 1-2 was tested using a roller abrasion tester. The specimens were cylindrical with a diameter of 16 mm and a height of 6.5 mm. The test results are shown in Table 1.

[0056] Table 1 Performance Test Data Analyze Examples 1-3 and Comparative Examples 1-2, and refer to Table 1 and... Figure 1 It can be seen that by using L-aspartic acid to pre-composite with metal ions, the aggregation of metal ions is reduced, their dispersibility is increased, and they work synergistically with the phenolic hydroxyl groups and flexible segments in tannic acid, hydroxyethyl methacrylate, and lauryl methacrylate, which has a significant effect on improving the wear resistance and resilience of rubber rollers.

[0057] Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A rubber roller, characterized in that: The product includes an outer coating material and a mandrel. The outer coating material is made from the following raw materials in parts by weight: 100-120 parts of nitrile rubber, 30-35 parts of reinforcing filler, 3-4 parts of vulcanization system, 2.5-6 parts of zinc oxide, 1-1.5 parts of stearic acid, 1-3 parts of L-aspartic acid-metal ion complex, and 2-4 parts of reinforcing agent. The reinforcing agent is prepared from tannic acid, hydroxyethyl methacrylate, and lauryl methacrylate.

2. The rubber roller according to claim 1, characterized in that: The L-aspartic acid-metal ion complex is prepared by mixing L-aspartic acid and ferric chloride in a solvent.

3. A rubber roller according to claim 1, characterized in that: The preparation method of the reinforcing agent includes the following steps: mixing tannic acid with 2-bromoisobutyryl bromide and reacting them, then adding a catalyst, hydroxyethyl methacrylate, and lauryl methacrylate to carry out a polymerization reaction to obtain the reinforcing agent.

4. A rubber roller according to claim 1, characterized in that: The mass ratio of tannic acid, hydroxyethyl methacrylate and lauryl methacrylate is (2-2.5):1:(1.2-1.5).

5. A rubber roller according to claim 3, characterized in that: The polymerization reaction is carried out at a temperature of 60-65℃ for 8-10 hours.

6. A rubber roller according to claim 1, characterized in that: The vulcanization system consists of sulfur and an accelerator.

7. A rubber roller according to claim 1, characterized in that: The reinforcing filler is at least one of carbon black or silica.

8. A method for preparing a rubber roller, characterized in that: Includes the following steps: 1) Take nitrile rubber and mix it in an intensive manner. Then add zinc oxide, stearic acid, L-aspartic acid-metal ion complex. After the first stage of mixing, add reinforcing filler and reinforcing agent and carry out the second stage of mixing. Discharge the rubber to obtain masterbatch. After mixing the masterbatch with the vulcanization system, continue to mix and sheet to obtain the outer coating material. 2) The outer coating material is wrapped around the outer surface of the mandrel, and after vulcanization, a rubber roller is obtained.

9. A method for preparing a rubber roller according to claim 8, characterized in that: In step 1), the temperature of the first mixing stage is 70-85℃, and the time is 3-5 minutes. And / or, the temperature of the second stage of mixing is 70-80℃, and the time is 1-2 minutes.

10. A method for preparing a rubber roller according to claim 8, characterized in that: In step 2), the vulcanization conditions are: vulcanization for 50-70 minutes at a pressure of 0.3-0.5 MPa.

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