Rubber composition, preparation method thereof and corn husking roller

Abstract

The invention provides a rubber composition, a preparation method thereof and a corn husking roller. The rubber composition comprises 40-100 parts of polystyrene-butadiene rubber. 0-60 parts of nitrile rubber; 0 to 60 parts of polybutadiene rubber; 0 to 60 parts of polyisoprene rubber; 20 to 100 parts of a filler; 1-20 parts of a plasticizer; 0.5 to 11 parts of an anti-aging agent; 0.5 to 10 parts of an activating agent; the content of a styrene unit in the polystyrene-butadiene rubber is 10wt%-50wt%, and the molar content of 1, 2-vinyl in a butadiene unit in the polystyrene-butadiene rubber is 15%-70%. The problems that in the prior art, the rubber roller is short in service life, low in peeling efficiency and prone to damaging corn kernels due to the fact that abrasion resistance and wet friction force of a rubber material in a corn peeling rubber roller are difficult to consider at the same time are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of corn peeling rollers, and in particular to a rubber composition and a preparation method thereof, and a corn peeling roller. Background Art

[0002] Corn harvesters are key equipment in modern mechanized agriculture, and their efficient and stable operation is crucial for improving corn harvest quality and efficiency. The husking mechanism, particularly the husking roller, is a core component of corn harvesters, responsible for husking the corn ears. Traditional corn husking mechanisms mostly use iron rollers. However, while these rollers offer high wear resistance and strength, their relatively low coefficient of friction and insufficient gripping capacity result in low corn husking efficiency and can easily damage the corn kernels, impacting corn quality.

[0003] In recent years, rubber peeling rollers have gained popularity due to their high friction coefficient and elastic cushioning properties, aiming to improve peeling efficiency and minimize kernel damage. Rubber peeling rollers significantly enhance corn husk grip, reduce kernel breakage, and improve peeling efficiency. However, conventional rubber materials have significant shortcomings in wear resistance. This wear, especially under prolonged and intensive operating conditions, severely impacts the roller's service life and overall economic benefits.

[0004] Existing solutions on the market attempt to improve rubber wear resistance by modifying the rubber formula. Patent CN200820134727.9 proposes a vulcanization system based on polyether-based polyurethane, supplemented with silica and peroxide, to enhance rubber wear resistance. However, this rubber formula exhibits low friction when wet or when harvesting fresh corn, resulting in slippage and poor peeling performance.

[0005] Currently, there is a significant market demand for high-efficiency, wear-resistant peeling rubber rollers that can both improve peeling efficiency and ensure kernel integrity. Existing rubber formulations and processes struggle to strike a balance between wear resistance, wet friction, and processability. Maintaining good friction performance and extending the life of rubber peeling rollers, particularly in high-humidity environments, has become a pressing technical challenge for the industry. Summary of the Invention

[0006] The main purpose of the present invention is to provide a rubber composition and a preparation method thereof, and a corn peeling roller, so as to solve the problem that the wear resistance and wet friction of the rubber material in the corn peeling rubber roller in the prior art are difficult to balance, resulting in a short roller life, low peeling efficiency and easy damage to corn kernels.

[0007] To achieve the above-mentioned object, according to one aspect of the present invention, a rubber composition is provided, which comprises, by weight, 40 to 100 parts of polystyrene-butadiene rubber; 0 to 60 parts of nitrile rubber; 0 to 60 parts of polybutadiene rubber; 0 to 60 parts of polyisoprene rubber; 20 to 100 parts of filler; 1 to 20 parts of plasticizer; 0.5 to 11 parts of antioxidant; 0.5 to 10 parts of activator; and 0.2 to 5 parts of vulcanizing agent.

[0008] Furthermore, the composition includes, by weight: 40 to 100 parts of polystyrene-butadiene rubber; 0 to 45 parts of nitrile rubber; 5 to 50 parts of polybutadiene rubber; 5 to 50 parts of polyisoprene rubber; 40 to 90 parts of filler; 2 to 15 parts of plasticizer; 1 to 9 parts of antioxidant; 1 to 7 parts of activator; and 0.5 to 3 parts of vulcanizing agent.

[0009] Furthermore, the content of styrene units in the polystyrene-butadiene rubber is 10 wt% to 50 wt%, and the molar content of 1,2-vinyl groups in the butadiene units in the polystyrene-butadiene rubber is 15% to 70%; and / or,

[0010] The polystyrene-butadiene rubber is a solution polystyrene-butadiene rubber and / or an emulsion polystyrene-butadiene rubber; and / or,

[0011] The acrylonitrile content of the nitrile rubber is 18 wt% to 50 wt%. Preferably, the acrylonitrile content of the nitrile rubber is 30 wt% to 50 wt%.

[0012] Furthermore, the polybutadiene rubber is any one or more of high cis-nickel series and rare earth series butadiene rubber, and the structural content of cis-1,4-butadiene units is greater than 96%; and / or,

[0013] The polybutadiene rubber is selected from any one or more of BR9000, CB22, and CB24; and / or,

[0014] The polyisoprene rubber is any one or more of natural rubber and / or synthetic polyisoprene rubber;

[0015] Wherein, the natural rubber is selected from any one or more of STR20#, STR10#, SMR20#, SMR10#, and RSS3#; and the synthetic polyisoprene rubber is selected from any one or more of IR70, SKI-3, and IR2200.

[0016] Furthermore, the filler is any one or more of carbon black and white carbon black.

[0017] Furthermore, the specific surface area of ​​carbon black is 10 to 500 m 2 / g, preferably 10 to 300 m 2 / g, more preferably 100 to 250 m 2 / g; and / or,

[0018] The compression oil absorption value of carbon black is 60~180×10 -5 m 3 / kg, preferably 80 to 125×10 -5 m 3 / kg; and / or,

[0019] The specific surface area of ​​white carbon black is 10~500m 2 / g, preferably 10 to 300 m 2 / g, more preferably 100 to 300 m 2 / g; and / or,

[0020] The oil absorption value of white carbon black is 20 to 350 mL / 100 g, preferably 25 to 300 mL / 100 g, and more preferably 30 to 290 mL / 100 g.

[0021] Furthermore, the plasticizer is any one or more of oil and resin, wherein the oil is cycloparaffin oil and / or environmentally friendly aromatic oil.

[0022] Furthermore, the resin is any one or more of a tackifying resin and a tear-resistant resin;

[0023] The tackifying resin is selected from any one of tert-butylphenolic resin, C5 and / or C9 petroleum resin, and the tear-resistant resin is selected from rosin / C9 mixed resin.

[0024] Furthermore, the antioxidant is one or more of p-phenylenediamine, quinoline, phenolic antioxidants, and protective wax;

[0025] Preferably, the antioxidant is selected from any one or more of 4020 and RD; and / or,

[0026] The activator is selected from any one or more of zinc oxide and stearic acid; and / or,

[0027] The vulcanizing agent includes any one or more of sulfur, an accelerator, a sulfur donor, and a peroxide; the accelerator includes one or more of a thiazole accelerator, a sulfenamide accelerator, a thiuram accelerator, a dithiocarbamate accelerator, and a diphenylguanidine accelerator;

[0028] Preferably, the accelerator is selected from any one or more of DM, CZ, NS, TMTD, PX, and DPG.

[0029] According to another aspect of the present invention, a method for preparing a rubber composition is provided. The method is used to prepare the above-mentioned rubber composition, and the method comprises:

[0030] S1. Put the set number of polystyrene-butadiene rubber, nitrile rubber, polybutadiene rubber and polyisoprene rubber into an internal mixer for mixing. When the cumulative mixing time reaches the set time, add 2 / 3 of the total amount of filler to the internal mixer and continue mixing. When the cumulative mixing time reaches the set time, add 1 / 3 of the total amount of filler and naphthenic oil. When the rubber temperature reaches 150°C, add the set number of plasticizers, antioxidants and activators to the internal mixer. Continue mixing until the rubber temperature is 150°C to 160°C, perform glue discharge, and put the rubber into the open mixer for 3 times. Park for more than 2 hours to obtain the first stage of rubber mix.

[0031] S2, the first section of the mixed rubber was added to the internal mixer for re-mixing for 3 minutes, and the rubber was discharged, and the mixed rubber was put into the open mixer for 3 times and parked for more than 2 hours to obtain the re-mixed rubber;

[0032] S3. Add the regrind rubber into an internal mixer and mix for 30 seconds, then add a vulcanizing agent, continue mixing for 2 minutes, and perform rubber removal to obtain a rubber composition.

[0033] According to another aspect of the present invention, a corn peeling roller is provided. The corn peeling roller is obtained by the above-mentioned preparation method.

[0034] By applying the technical solution of the present invention, the polystyrene-butadiene rubber in the technical solution provides basic wear resistance due to its molecular structure. By introducing reasonable proportions of nitrile rubber, polybutadiene rubber and polyisoprene rubber, the wear resistance and wet friction performance of the rubber roller can be guaranteed, and the processing performance of the rubber roller is also guaranteed. Nitrile rubber is a polar rubber with good wear resistance and heat resistance. By adjusting the amount of nitrile rubber, the wet friction force of the composition can be adjusted to ensure that when the corn is in a wet state, it can avoid causing major damage to the rubber roller.

[0035] The dispersion degree of the filler is also a key factor affecting the wear resistance of the composition. The use of a reasonable proportion of fillers in this solution can ensure the wear resistance of the composition. In addition, the high dispersion degree of the filler also enhances the friction performance of the rubber composition, thereby improving the peeling effect.

[0036] At the same time, the technical solution can effectively adjust the wet friction of the composition through the ratio of nitrile rubber and filler, ensuring sufficient gripping force and peeling efficiency when processing corn with high water content.

[0037] By adjusting the specific proportions of the above composition and optimizing the proportions of fillers, a composition with high wear resistance and high friction can be obtained. In particular, the composition still has high friction in a wet environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0039] Figure 1 A picture of a corn peeling roller made using the recipe of Example 2 of the present application is shown. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0041] As mentioned in the background technology, the purpose of this application is to provide a rubber composition and its preparation method, and a corn peeling roller to address the problems in the background technology, so as to solve the problem that the wear resistance and wet friction of the rubber material in the corn peeling rubber roller in the existing technology are difficult to balance, resulting in short roller life, low peeling efficiency and easy damage to corn kernels.

[0042] First, the present application provides a rubber composition, which includes, by weight, 40 to 100 parts of polystyrene-butadiene rubber; 0 to 60 parts of nitrile rubber; 0 to 60 parts of polybutadiene rubber; 0 to 60 parts of polyisoprene rubber; 20 to 100 parts of filler; 1 to 20 parts of plasticizer; 0.5 to 11 parts of antioxidant; 0.5 to 10 parts of activator; and 0.2 to 5 parts of vulcanizing agent.

[0043] In the rubber composition of this application, polystyrene-butadiene rubber is used as the primary rubber base. It contains a specific proportion of styrene-based structures, which can increase the rigidity of the molecular chain and the interaction between molecules, effectively resisting mechanical wear. At the same time, the addition of polybutadiene rubber and polyisoprene rubber enhances the rubber's cold resistance and elasticity, further improving its wear resistance, especially in low temperatures and complex operating environments. This composite formula achieves superior wear resistance compared to a single rubber base by carefully controlling the dosage of each rubber component.

[0044] The addition of nitrile rubber, due to its polarity and high acrylonitrile content, maintains a high coefficient of friction in both dry and wet conditions. By adjusting the amount of nitrile rubber, the friction of the rubber roller can be flexibly adjusted according to the actual working environment (such as humidity changes during corn harvest). This ensures efficient peeling performance while avoiding kernel damage caused by excessive friction, achieving a perfect balance between friction performance and peeling efficiency.

[0045] By rationally combining the advantages of different rubbers, this composition can simultaneously possess high hardness, high tensile strength and moderate elasticity, which can ensure the structural integrity and durability of the rubber roller under high-intensity operation, while the moderate elasticity helps to reduce the pressure on the grain and prevent excessive damage.

[0046] Furthermore, the use of plasticizers reduces the Mooney viscosity of the rubber compound, improving its processing properties and making the rubber composition easier to mix and form during the manufacturing process. The amount of filler used can affect the hardness of the composition. By setting the filler dosage between 20 and 100 parts per million, this technical solution improves the hardness of the composition while also ensuring its wear resistance.

[0047] Furthermore, the composition includes, by weight: 40 to 100 parts of polystyrene-butadiene rubber; 0 to 45 parts of nitrile rubber; 5 to 50 parts of polybutadiene rubber; 5 to 50 parts of polyisoprene rubber; 30 to 90 parts of filler; 2 to 15 parts of plasticizer; 1 to 9 parts of antioxidant; 1 to 7 parts of activator; and 0.5 to 3 parts of vulcanizing agent.

[0048] Polystyrene-butadiene rubber is used as the main rubber, and its ratio of 40 to 70 parts ensures the basic wear resistance of the rubber composition. 0 to 45 parts of nitrile rubber can improve the wet friction of the composition to ensure that when the corn is in a wet state, it can avoid causing significant damage to the rubber roller. The addition of polystyrene-butadiene rubber can improve the wear resistance of the rubber composition. Because the styrene-based structure in polystyrene-butadiene rubber has greater rigidity, it can improve the wear resistance of the composition, thereby extending the service life of the corn peeling roller. The addition of polybutadiene rubber (5 to 50 parts), especially its high cis content, gives the composition excellent resilience and low-temperature stability, which supplements the performance defects of polystyrene-butadiene rubber in low temperatures and complex environments, achieving a higher level of wear resistance, ensuring that the corn peeling roller is not easily damaged during operation and can effectively grasp the corn husk.

[0049] By carefully controlling the amount of polybutadiene rubber and polyisoprene rubber used, the formula can achieve both high hardness and high elasticity, ensuring the durability of the rubber roller while taking into account flexibility during the peeling process, thus avoiding grain breakage caused by excessive rigidity.

[0050] The proper use of fillers (30-90%) in this formulation increases the hardness of the composition, helping to maintain the stability of the rubber's shape during peeling. The addition of plasticizers, antioxidants, and activators not only improves the processing properties of the rubber mixture but also enhances the versatility of the rubber roller across different crop types and harvesting environments.

[0051] Furthermore, the content of styrene units in the polystyrene-butadiene rubber is 10 wt% to 50 wt%, and the molar content of 1,2-vinyl groups in the butadiene units in the polystyrene-butadiene rubber is 15% to 70%; and / or,

[0052] The polystyrene-butadiene rubber is a solution polystyrene-butadiene rubber and / or an emulsion polystyrene-butadiene rubber; and / or,

[0053] The acrylonitrile content of the nitrile rubber is 18 wt% to 50 wt%. Preferably, the acrylonitrile content of the nitrile rubber is 30 wt% to 50 wt%.

[0054] The addition of styrene units improves the rigidity of the polystyrene-butadiene rubber molecular chain, giving the final product better wear resistance and moderate hardness, which not only ensures the durability of the corn peeling roller during operation, but also avoids kernel damage and decreased gripping efficiency caused by excessive hardness.

[0055] The acrylonitrile content of nitrile rubber directly affects the compound's friction in wet conditions. A high acrylonitrile content, particularly within the preferred range of 30% to 50% by weight, significantly increases the rubber's wet coefficient of friction, ensuring sufficient friction when peeling corn in wet conditions, reducing the chances of incomplete peeling and kernel damage caused by insufficient friction.

[0056] The synergistic effect of polystyrene-butadiene rubber and nitrile rubber ensures that the rubber composition not only ensures wear resistance and friction, but also has good resilience and aging resistance, so that the corn peeling rubber roller can still maintain stable performance after operating for a long time and in complex environments.

[0057] Furthermore, the polybutadiene rubber is any one or more of high cis-nickel series and rare earth series butadiene rubber, and the structural content of cis-1,4-butadiene units is greater than 96%; and / or,

[0058] The polybutadiene rubber is selected from any one or more of BR9000, CB22, and CB24; and / or

[0059] The polyisoprene rubber is any one or more of natural rubber and / or synthetic polyisoprene rubber;

[0060] Among them, the natural rubber is selected from any one or more of STR20#, STR10#, SMR20#, SMR10#, and RSS3#; and the synthetic polyisoprene rubber is selected from any one or more of IR70, SKI-3, and IR2200.

[0061] A high cis content in polybutadiene rubber significantly improves the low-temperature toughness and wear resistance of the rubber composition. High-cis polybutadiene rubber typically has a lower glass transition temperature, allowing it to remain soft and elastic at lower temperatures. This helps corn husking rollers avoid brittle fracture caused by excessive hardening, especially in cold weather.

[0062] Due to the high cis structure of polybutadiene rubber, polybutadiene rubber maintains good resilience and energy absorption capacity when the load changes. For corn peeling rollers, it can reduce energy loss and improve peeling efficiency during continuous operation and frequent grabbing actions, while reducing additional wear caused by mechanical vibration.

[0063] The use of high-cis polybutadiene rubbers, such as BR9000, CB22, and CB24, along with the selection of polyisoprene rubber, not only optimizes the physical properties of the rubber composition but also improves its processing. High-cis polybutadiene rubber, due to its uniform molecular structure, is easier to mix and facilitates the uniform dispersion of fillers and other additives.

[0064] The synergistic effect of high-cis polybutadiene rubber and natural or synthetic polyisoprene rubber ensures that the corn peeling roller can maintain consistent working efficiency in various environments, even in extreme weather conditions, without affecting its peeling efficiency and kernel protection ability.

[0065] Furthermore, the filler is any one or more of carbon black and white carbon black.

[0066] The high specific surface area of ​​carbon black can enhance the wear resistance of the composition. By adjusting the amount of carbon black, the hardness of the rubber composition can be adjusted. Since silica has hydrophilic properties, the addition of silica can significantly increase the friction of rubber in a wet environment. By using carbon black or silica as a filler, the service life of the composition can be extended. At the same time, a reasonable ratio of silica to carbon black can further enhance the wet friction of the composition while ensuring the wear resistance of the composition.

[0067] In addition, the rigid reinforcement of carbon black combined with the elasticity imparted by white carbon black enables the rubber composition to withstand high-intensity mechanical wear while having sufficient elastic recovery to reduce grain damage.

[0068] Furthermore, the specific surface area of ​​carbon black is 10 to 500 m 2 / g, preferably 10 to 300 m2 / g, more preferably 100 to 250 m 2 / g; and / or,

[0069] The compression oil absorption value of carbon black is 60~180×10 -5 m 3 / kg, preferably 80 to 125×10 -5 m 3 / kg; and / or,

[0070] Silica includes 1165MP, 1200MP, Premium, HCSIL-900MP, or any one or more thereof; and / or

[0071] The specific surface area of ​​white carbon black is 10~500m 2 / g, preferably 10 to 300 m 2 / g, more preferably 100 to 300 m 2 / g; and / or,

[0072] The oil absorption value of white carbon black is 20 to 350 mL / 100 g, preferably 25 to 300 mL / 100 g, and more preferably 30 to 290 mL / 100 g.

[0073] The specific surface area and compression oil absorption value of carbon black largely determine its reinforcement in rubber. The more preferred specific surface area of ​​carbon black (100 to 250 m 2 / g) and CDBP value (80~125×10 -5 m 3 / kg), which means more effective molecular reinforcement, significantly improving the wear resistance of the rubber composition. The use of high-surface-area, high-structure carbon black in this solution with high filler loadings helps improve the wear resistance of the composition. To achieve good carbon black dispersion, a rational mixing process can significantly enhance filler dispersion, thereby improving the wear resistance of the composition.

[0074] The selection of white carbon black, especially Series and HCSIL-900MP and other brands, due to their high specific surface area (preferably 100 to 300m 2 / g) and oil absorption value (preferably 30 to 290 mL / 100 g), which can better adapt to wet environments and improve the friction of the rubber composition in the presence of water. The hydrophilicity of silica enables it to form a more stable interface layer in a wet state, thereby improving the grip under wet conditions.

[0075] The synergistic effect of carbon black and silica not only improves wear resistance and friction, but also ensures that the rubber composition can maintain high strength while also having good toughness, reducing damage to corn kernels and improving the precision and efficiency of peeling operations.

[0076] Furthermore, the plasticizer is any one or more of oil and resin, wherein the oil is cycloparaffin oil and / or environmentally friendly aromatic oil.

[0077] The addition of plasticizers, especially oil plasticizers, such as naphthenic oil and environmentally friendly aromatic oil, can significantly reduce the viscosity of the rubber compound, improve its fluidity and plasticity, which can reduce the shear stress during mixing.

[0078] During processing, the rubber compound needs to flow and deform in the equipment. However, excessive viscosity will increase the equipment load, cause uneven mixing, and affect product quality. Therefore, reducing viscosity through plasticizers can ensure a smooth processing flow.

[0079] Oil plasticizers such as naphthenic oil and environmentally friendly aromatic oil can improve the flexibility and resilience of rubber compositions under low temperature conditions due to their special low-temperature fluidity, which enables the rubber composition to work normally even in cold environments.

[0080] Rubber materials tend to harden and lose their elasticity at low temperatures, but the addition of plasticizers can lower the glass transition temperature of rubber, allowing it to remain flexible at lower temperatures.

[0081] Furthermore, the resin is any one or more of a tackifying resin and a tear-resistant resin;

[0082] The tackifying resin is selected from any one of tert-butylphenolic resin, C5 and / or C9 petroleum resin, and the tear-resistant resin is selected from rosin / C9 mixed resin.

[0083] Tear-resistant resins, such as rosin / C9 blends, enhance the material's resistance to shear and tearing by improving the layout of the rubber's molecular chains.

[0084] The addition of resin plasticizer not only optimizes the physical properties of the rubber composition, but also improves its processing performance.

[0085] The selection of tackifying resin and anti-tear resin can also enhance the environmental adaptability of the rubber composition.

[0086] Furthermore, the antioxidant is one or more of p-phenylenediamine, quinoline, phenolic antioxidants, and protective wax;

[0087] Preferably, the antioxidant is selected from any one or more of 4020 and RD; and / or,

[0088] The activator is selected from any one or more of zinc oxide, stearic acid, and / or

[0089] The vulcanizing agent includes any one or more of sulfur, an accelerator, a sulfur donor, and a peroxide; the accelerator includes one or more of a thiazole accelerator, a sulfenamide accelerator, a thiuram accelerator, a dithiocarbamate accelerator, and a diphenylguanidine accelerator;

[0090] Preferably, the accelerator is selected from any one or more of DM, CZ, NS, TMTD, PX, and DPG.

[0091] Antioxidants, particularly amine-based antioxidants, can effectively inhibit the oxidation and aging of rubber during use due to environmental factors such as ultraviolet rays, oxygen, and ozone. Antioxidants 4020 and RD are preferred because they have a wide range of applications and excellent stability, significantly extending the service life of rubber products. The addition of antioxidants enhances the antioxidant capacity of rubber molecules and reduces molecular chain breakage, thereby maintaining the stability of the physical properties of the rubber composition and making it less susceptible to performance degradation due to environmental factors.

[0092] Preferred vulcanizing agents and accelerators (such as sulfur, DM, CZ, NS, TMTD, PX, and DPG) can promote rapid vulcanization while ensuring optimal vulcanizate performance. Suitable accelerators can accelerate the vulcanization reaction, shorten the vulcanization time, and improve production efficiency. Sulfur, as a vulcanizing agent, can form a stable vulcanization network, enhancing the rubber's heat resistance, oil resistance, and wear resistance.

[0093] By adding activators such as zinc oxide and stearic acid, the reaction between rubber and vulcanizer can be accelerated, the vulcanization efficiency can be improved, and the consistency and high quality of the final product can be ensured.

[0094] The present application also provides a method for preparing a rubber composition, which is used to prepare the above-mentioned rubber composition, and the preparation method comprises:

[0095] S1. Put the set number of polystyrene-butadiene rubber, nitrile rubber, polybutadiene rubber and polyisoprene rubber into an internal mixer for mixing. When the cumulative mixing time reaches the set time, add 2 / 3 of the total amount of filler to the internal mixer and continue mixing. When the cumulative mixing time reaches the set time, add 1 / 3 of the total amount of filler and naphthenic oil. When the rubber temperature reaches 150°C, add the set number of plasticizers, antioxidants and activators to the internal mixer. Continue mixing until the rubber temperature is 150°C to 160°C, perform glue discharge, and put the rubber into the open mixer for 3 times. Park for more than 2 hours to obtain the first stage of rubber mix.

[0096] S2, the first section of the mixed rubber was added to the internal mixer for re-mixing for 3 minutes, and the rubber was discharged, and the mixed rubber was put into the open mixer for 3 times and parked for more than 2 hours to obtain the re-mixed rubber;

[0097] S3. Add the regrind rubber into an internal mixer and mix for 30 seconds, then add a vulcanizing agent, continue mixing for 2 minutes, and perform rubber removal to obtain a rubber composition.

[0098] The preparation method of the rubber composition provided in the present application is used to prepare the above-mentioned rubber composition, and the preparation method comprises: mixing 40 to 100 parts of polystyrene-butadiene rubber, 0 to 60 parts of nitrile rubber, 0 to 60 parts of polybutadiene rubber, and 0 to 60 parts of polyisoprene rubber in an internal mixer; when the cumulative mixing time reaches a set time, first adding 2 / 3 of the total amount of filler to the internal mixer, and continuing to mix; when the cumulative mixing time also reaches the set time, adding 1 / 3 of the total amount of filler and naphthenic oil; when the temperature of the rubber reaches 150° C., adding 1 to 20 parts of a plasticizer and 0.5 to 10 parts of an activator to the internal mixer, and continuing to mix until the temperature of the rubber in the internal mixer is between 150° C. and 160° C.; then discharging the rubber, and placing it in an open mixer for three times, and leaving it for more than 2 hours to obtain a first-stage mixed rubber;

[0099] The first section of the mixed rubber is added to an internal mixer for remixing for 3 minutes. The remixing can be repeated multiple times. After remixing, the rubber is drained and then placed in an open mixer for 3 rolls. The remixed rubber is left for more than 2 hours to obtain the remixed rubber. The remixed rubber is added to an internal mixer and mixed for 30 seconds. Then, a vulcanizing agent is added and mixed for another 2 minutes before draining. This mixing process can greatly improve the dispersion of the filler and the wear resistance of the rubber compound.

[0100] The present application also provides a corn peeling roller, which is obtained by the preparation method of the rubber composition.

[0101] The relevant information of the instruments and equipment used in the examples of this application is as follows in Table 1:

[0102] Table 1

[0103] Serial number Device Name Specifications Manufacturer 1 Internal mixer XSM-1 / 10-120 Shanghai Kechuang Rubber and Plastic Machinery Equipment Co., Ltd. 2 Open mixing mill 152.5*320 Guangdong Zhanjiang Machinery Factory 3 Flat vulcanizing press XLB-D600*600 Zhejiang Huzhou Dongfang Machinery Co., Ltd.

[0104] The relevant information of the testing instruments used in the test of the properties of the rubber composition in the embodiment of the present application is shown in Table 2 below:

[0105] Table 2

[0106]

[0107] The sources or technical parameters of the raw materials or reagents used in the examples and comparative examples of the present application are as follows:

[0108] Styrene-butadiene rubber, ESBR1502, a product of Qilu Branch of Sinopec;

[0109] Nitrile rubber, NBR 4450, produced by Lanxess Chemical (China) Co., Ltd., with an acrylonitrile content of 43.5%;

[0110] Natural rubber, STR 20#, standard rubber;

[0111] Butadiene rubber, BR9000, a product of Sinopec Qilu Branch;

[0112] Carbon black: N134, Shanghai Cabot Co., Ltd.; specific surface area 143m 2 / g, oil absorption value 127mL / 100g;

[0113] Stearic acid, a product of Tyco Brown Chemical (Zhangjiagang) Co., Ltd.

[0114] Zinc oxide, a product of Shijiazhuang Hetong Zinc Industry Co., Ltd.;

[0115] Protective wax 672S, a product of Qingdao Jinxian Chemical Co., Ltd.

[0116] Antioxidant RD, a product of Sinopec Nanjing Chemical Industry Co., Ltd.

[0117] Antioxidant 4020, a product of Jiangsu Shengao Chemical Technology Co., Ltd.

[0118] Naphthenic oil, a product of Shandong Tianyuan Chemical Co., Ltd.;

[0119] Accelerator CZ, a product of Shandong Shangshun Chemical Co., Ltd.

[0120] Sulfur, a product of Liaoning Chaoyang Tianming Industry and Trade Co., Ltd.

[0121] The parts in the following examples and comparative examples are all parts by mass. The formulas used in the comparative examples and Examples 1 to 4 are as follows:

[0122] Table 3: Formula ratio of comparative example and examples 1 to 4

[0123] Comparative Example Example 1 Example 2 Example 3 Example 4 ESBR1502 100 70 40 55 40 NBR 4450 0 0 0 15 30 BR9000 0 15 40 15 15 STR 20# 0 15 20 15 15 N134 65 65 65 65 65 stearic acid 2.0 2.0 2.0 2.0 2.0 zinc oxide 3.5 3.5 3.5 3.5 3.5 Protective wax 1.0 1.0 1.0 1.0 1.0 Antioxidant RD 1.5 1.5 1.5 1.5 1.5 Antioxidant 4020 2.0 2.0 2.0 2.0 2.0 Naphthenic oil 10 10 10 10 10 Accelerator CZ 1.7 1.7 1.7 1.7 1.7 sulfur 1.6 1.6 1.6 1.6 1.6 total 188.3 188.3 188.3 188.3 188.3

[0124] Comparative Example

[0125] After mixing 100 parts of styrene-butadiene rubber in an internal mixer for 1 minute, filler is added to the internal mixer in two batches. The first batch is 2 / 3 of the total filler. After mixing in the internal mixer for 1 minute, the remaining 1 / 3 of the filler is added, and naphthenic oil is added at the same time. Mixing in the internal mixer is continued until the rubber temperature reaches 150°C. Stearic acid, zinc oxide, protective wax, antioxidant and naphthenic oil are added to the internal mixer. Mixing is continued until the rubber temperature reaches between 150°C and 160°C. The rubber is discharged to obtain a first-stage mixed masterbatch. The obtained first-stage mixed masterbatch is placed in an open mixer and rolled three times and left to stand for more than 2 hours. A section of masterbatch was added into an internal mixer and mixed for 30 seconds, and then a vulcanizing agent was added. After continuing to mix for 2 minutes, the rubber was discharged to obtain the final rubber mix of the comparative example. After the final rubber mix was left for 8 hours, a certain mass of the final rubber mix was weighed and put into a rubber roller mold, and vulcanized on a flat vulcanizer to obtain a corn husk rubber roller. The vulcanization temperature in the flat vulcanizer was 140°C and the vulcanization time was 30 minutes.

[0126] Examples 1 to 4

[0127] Polystyrene-butadiene rubber, nitrile rubber, polybutadiene rubber and polyisoprene rubber are mixed in an internal mixer according to the formula ratios in Table 3. When the cumulative mixing time reaches the set time, 2 / 3 of the total amount of filler is added to the internal mixer and mixing is continued. When the cumulative mixing time reaches the set time, 1 / 3 of the remaining total amount of filler and naphthenic oil are added. When the temperature of the rubber reaches 150°C, the plasticizer, antioxidant and activator weighed according to the formula ratio in Table 3 are added to the internal mixer, and mixing is continued until the temperature of the rubber is between 150°C and 160°C. The rubber is then discharged and placed in an open mixer for 3 times and left to stand for more than 2 hours to obtain the first stage of mixed rubber.

[0128] The first section of the mixed rubber was added to the internal mixer for re-mixing for 3 minutes, and the rubber was discharged. The mixed rubber was then put into the open mixer for 3 times and parked for more than 2 hours to obtain the re-mixed rubber.

[0129] After adding the re-mixed rubber to the internal mixer and mixing for 30 seconds, the vulcanizing agent was added, and mixing was continued for 2 minutes. The rubber was discharged to obtain the rubber composition. According to the above process and the formula in Table 3, the final rubber mixes corresponding to Examples 1 to 4 were obtained. After the final rubber mix was parked for 8 hours, a certain mass of the final rubber mix was weighed and placed in a rubber roller mold. After vulcanization on a flat vulcanizing press, a corn husk rubber roller was obtained. The vulcanization temperature when vulcanizing the final rubber mix was 140° C. and the vulcanization time was 30 minutes. Rubber rollers corresponding to Examples 1, 2, 3 and 4 were obtained.

[0130] Performance Testing

[0131] The test results of the rubber compositions prepared in Examples 1 to 4 and the comparative example are shown in Table 4 below:

[0132] Table 4: Performance test of rubber compositions prepared by dry process and continuous process

[0133]

[0134]

[0135] As can be seen from Table 4, compared with the comparative example, the filler dispersion of the rubber composition in Examples 1 to 4 is improved, and the maximum can reach 9.2. The tensile strength is greatly improved compared with the comparative example, and the Akron wear index and wet friction index are improved. The rubber composition prepared in Example 2 of the present application and the rubber composition prepared in the comparative example were respectively made into corn peeling rollers and tested. The test target was to peel 5000 mu of corn respectively. The test results are as follows: Figure 1 The corn peeling roller prepared by Example 2 of the present application still has a good product appearance after peeling 5,000 mu of corn, and the damage to the kernels on the ears is low, and there is no abnormal wear. However, the corn peeling roller prepared by the comparative example has a large wear on the appearance after peeling 5,000 mu of corn, and the kernels on the ears are greatly damaged after being peeled by the corn peeling roller prepared by the comparative example; wherein, Figure 1 This is a photo of the corn peeling roller made with the recipe of Example 2 after peeling corn.

[0136] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0137] This technical solution ensures the wear resistance and wet friction performance of the composition by rationally optimizing the ratio of polystyrene-butadiene rubber, nitrile rubber, polybutadiene rubber and polyisoprene rubber. It further uses high-specific surface area and high-structure carbon black with a high filler content. In order to achieve good carbon black dispersion, the mixing preparation method is optimized, which can greatly improve the dispersion of the filler and the wear resistance of the rubber. By adjusting the ratio of the above-mentioned rubber types and optimizing the number of fillers, a rubber composition with high wear resistance and high friction can be obtained, especially in a wet environment, which still has corresponding wear resistance. The corn peeling rubber roller prepared by the above-mentioned composition has the advantages of long service life, high peeling net rate and no damage to the kernels in the ears.

[0138] The rubber composition prepared using this technical solution has been verified in actual vehicle testing to have superior wear resistance, wet friction, and kernel protection properties to existing technologies. This demonstrates that the corn peeling rubber roller prepared using this solution not only has a longer service life and higher peeling efficiency, but also better protects the corn kernels and reduces losses during production.

[0139] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0140] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0141] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0142] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0143] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0144] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A rubber composition, characterized in that In parts by weight, the composition comprises: 40 to 100 parts of polystyrene-butadiene rubber; 0-60 parts of nitrile rubber; 0-60 parts of polybutadiene rubber; 0-60 parts of polyisoprene rubber; 20 to 100 parts of filler; 1 to 20 parts of plasticizer; 0.5 to 11 parts of antioxidant; 0.5-10 parts of activator; 0.2 to 5 parts of vulcanizing agent; The content of styrene units in the polystyrene-butadiene rubber is 10 wt% to 50 wt%, and the molar content of 1,2-vinyl groups in the butadiene units in the polystyrene-butadiene rubber is 15% to 70%.

2. The rubber composition according to claim 1, characterized in that In parts by weight, the composition comprises: 40 to 100 parts of the polystyrene-butadiene rubber; 0 to 45 parts of the nitrile rubber; 5 to 50 parts of the polybutadiene rubber; 5 to 50 parts of the polyisoprene rubber; 30 to 90 parts of the filler; 2 to 15 parts of the plasticizer; 1 to 9 parts of the antioxidant; 1 to 7 parts of the activator; 0.5 to 3 parts of the vulcanizing agent.

3. The rubber composition according to claim 1 or 2, characterized in that The polystyrene-butadiene rubber is a solution polystyrene-butadiene rubber and / or an emulsion polystyrene-butadiene rubber; and / or, The acrylonitrile content of the nitrile rubber is 18 wt% to 50 wt%. Preferably, the acrylonitrile content of the nitrile rubber is 30 wt% to 50 wt%.

4. The rubber composition according to claim 1 or 2, characterized in that The polybutadiene rubber is any one or more of high cis-nickel series and rare earth series butadiene rubber, and the structural content of cis-1,4-butadiene units is greater than 96%; and / or, The polybutadiene rubber is selected from any one or more of BR9000, CB22, and CB24; and / or, The polyisoprene rubber is any one or more of natural rubber and / or synthetic polyisoprene rubber; Wherein, the natural rubber is selected from any one or more of STR20#, STR10#, SMR20#, SMR10#, and RSS3#; and the synthetic polyisoprene rubber is selected from any one or more of IR70, SKI-3, and IR2200.

5. The rubber composition according to claim 1 or 2, characterized in that The filler is any one or more of carbon black and white carbon black.

6. The rubber composition according to claim 5, characterized in that The specific surface area of ​​the carbon black is 10 to 500 m 2 / g, preferably 10 to 300 m 2 / g, more preferably 100 to 250 m 2 / g; and / or, The compression oil absorption value of the carbon black is 60 to 180×10 -5 m 3 / kg, preferably 80 to 125 × 10 -5 m 3 / kg; and / or, The specific surface area of ​​the white carbon black is 10 to 500 m 2 / g, preferably 10 to 300 m 2 / g, more preferably 100 to 300 m 2 / g; and / or, The oil absorption value of the white carbon black is 20 to 350 mL / 100 g, preferably 25 to 300 mL / 100 g, and more preferably 30 to 290 mL / 100 g.

7. The rubber composition according to claim 1 or 2, characterized in that The plasticizer is any one or more of oil and resin, wherein the oil is cycloparaffin oil and / or environmentally friendly aromatic oil.

8. The rubber composition according to claim 7, characterized in that The resin is any one or more of a tackifying resin and a tear-resistant resin; The tackifying resin is selected from any one of tert-butylphenolic resin, C5 and / or C9 petroleum resin, and the anti-tear resin is selected from rosin / C9 mixed resin.

9. The rubber composition according to claim 1 or 2, characterized in that The antioxidant is one or more of p-phenylenediamine, quinoline, phenolic antioxidants, and protective wax; Preferably, the antioxidant is selected from any one or more of 4020 and RD; and / or, The activator is selected from any one or more of zinc oxide and stearic acid; and / or, The vulcanizing agent includes any one or more of sulfur, an accelerator, a sulfur donor, and a peroxide, and the accelerator includes one or more of a thiazole accelerator, a sulfenamide accelerator, a thiuram accelerator, a dithiocarbamate accelerator, and a diphenylguanidine accelerator; Preferably, the accelerator is selected from any one or more of DM, CZ, NS, TMTD, PX, and DPG.

10. A method for preparing a rubber composition, characterized in that: The preparation method is used to prepare the rubber composition according to any one of claims 1 to 9, and the preparation method comprises: S1. Put set amounts of polystyrene-butadiene rubber, nitrile rubber, polybutadiene rubber, and polyisoprene rubber into an internal mixer for mixing. When the cumulative mixing time reaches the set time, add 2 / 3 of the total amount of filler to the internal mixer and continue mixing. When the cumulative mixing time reaches the set time, add 1 / 3 of the total amount of filler and naphthenic oil. When the temperature of the rubber compound reaches 150° C., add the set amounts of plasticizer, antioxidant, and activator to the internal mixer. Continue mixing until the temperature of the rubber compound is 150° C. to 160° C., perform binder discharge, and put the rubber compound into an open mixer for 3 times. Let it sit for more than 2 hours to obtain a first-stage rubber mix. S2, adding the first section of the mixed rubber to the internal mixer for re-mixing for 3 minutes, performing glue removal, and placing it in the open mixer for 3 times, and parking it for more than 2 hours to obtain the re-mixed rubber; S3, adding the re-mixed rubber into an internal mixer and mixing for 30 seconds, adding a vulcanizing agent, continuing mixing for 2 minutes, and performing rubber removal to obtain the rubber composition.

11. A corn peeling roller, characterized in that: It is prepared by the preparation method according to claim 10.

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