Oil-resistant EPDM (ethylene-propylene-diene monomer) rubber tube material and preparation method thereof

Abstract

The invention relates to the technical field of hose materials, and particularly discloses an oil-resistant EPDM (Ethylene-Propylene-Diene Monomer) rubber hose material and a preparation method thereof. The invention relates to an oil-resistant EPDM (Ethylene-Propylene-Diene Monomer) rubber tube material, which is prepared from the following raw materials in parts by weight: 65-75 parts of EPDM rubber; 25-35 parts of nitrile rubber; 20 to 40 parts of white carbon black; 70 to 100 parts of kaolin; 10-15 parts of a plasticizer; 3-5 parts of zinc oxide; 1-2 parts of stearic acid; 1-3 parts of a silane coupling agent; 4 to 6 parts of EVM; 1-3 parts of titanium dioxide; 3-5 parts of a vulcanizing agent; 1-3 parts of an accelerant; the preparation method comprises the following steps: mixing the EPDM rubber, the nitrile rubber, the EVM, the zinc oxide and the stearic acid, adding the kaolin, the titanium dioxide, the silane coupling agent, the white carbon black and the plasticizer, continuously mixing, and discharging to obtain a rubber material; after the rubber material is subjected to standing treatment, a vulcanizing agent and an accelerant are added for mixing, and open mixing and rubber turning are performed after mixing is completed. According to the oil-resistant EPDM rubber tube material disclosed by the invention, various rubber raw materials can show excellent bonding property and compatibility, so that relatively good oil resistance and thermal aging resistance can be exerted.

Description

Technical Field

[0001] The present application relates to the technical field of hose materials, and more specifically, to an oil-resistant EPDM hose material and a preparation method thereof. Background Art

[0002] EPDM hose, also known as ethylene propylene diene monomer rubber hose, is a pipe made of ethylene propylene diene monomer rubber (EPDM) as raw material. It has the characteristics of light weight, economical cost, excellent temperature resistance and corrosion resistance. It is widely used in construction, transportation and industrial fields.

[0003] In terms of the actual application of EPDM hoses, there are certain defects in oil resistance. This is mainly because the molecular structure of EPDM rubber lacks active groups and has low cohesive energy, which makes it easy to swell and degrade in performance in these solvents. As a result, its stability in aliphatic solvents is poor, especially its resistance to immersion in No. 3 standard oil. In order to improve the oil resistance of EPDM hose, one or more rubbers are usually used to blend with EPDM for modification. For example, the invention patent application document with publication number CN118061599A discloses a rubber hose with long service life and a preparation method thereof, which relates to the technical field of rubber hoses, and includes an inner rubber layer, a skeleton layer and an outer rubber layer. The inner rubber layer is blended by 20 to 40 parts of nitrile rubber, 20 to 40 parts of chloroprene rubber, 10 to 20 parts of ethylene propylene diene rubber, 10 to 20 parts of nylon, 5 to 10 parts of polyolefin, 5 to 10 parts of polycarbonate, 5 to 10 parts of reinforcing filler, 2 to 5 parts of antioxidant, 0.2 to 5 parts of vulcanizer and 1 to 2 parts of promoting plasticizer. The inner rubber layer of the present invention is made of materials such as EPDM rubber, nylon, polyolefin, polycarbonate, etc. The EPDM rubber has good aging resistance, water vapor resistance and hot water resistance, the polyolefin has good oil resistance and aging resistance, and the polycarbonate has excellent water resistance and acid and alkali resistance. It is suitable for the circulation needs of different liquids in the rubber hose, meets the use requirements of the rubber hose in low temperature, high temperature and high humidity environments, and extends the service life of the rubber hose.

[0004] Regarding the above-mentioned related technologies, the inventors believe that although the blending of multiple rubbers can improve the oil resistance of EPDM hoses, it is often difficult to maintain excellent bonding and compatibility between rubbers, resulting in the improvement of oil resistance often failing to achieve the expected effect, and will have an adverse effect on the original excellent heat aging resistance performance of EPDM rubber itself.

[0005] Therefore, it is urgent to propose a solution to solve the above technical problems. Summary of the invention

[0006] In order to improve the bonding and compatibility between various rubbers in EPDM hoses and to demonstrate relatively excellent oil resistance and heat aging resistance, the present application provides an oil-resistant EPDM hose material and a preparation method thereof.

[0007] In the first aspect, the present application provides an oil-resistant EPDM hose material, which adopts the following technical solution: An oil-resistant EPDM hose material is made of the following raw materials in parts by weight: EPDM rubber 65-75 parts; 25-35 parts of nitrile rubber; 20-40 parts of white carbon black; Kaolin 70-100 parts; 10-15 parts of plasticizer; 3-5 parts of zinc oxide; 1-2 parts of stearic acid; 1-3 parts of silane coupling agent; EVM 4-6 copies; 1-3 parts of titanium dioxide; 3-5 parts of vulcanizing agent; 1-3 parts of accelerator.

[0008] By adopting the above technical scheme, nitrile rubber has excellent oil resistance, and has a significant effect when blended with EPDM, and can form a network structure with excellent strength and toughness; EVM has excellent heat resistance, ozone resistance and weather resistance, and has certain oil resistance. Blending with EPDM can improve oil resistance and further enhance other properties; at the same time, when nitrile rubber and EVM are compounded on EPDM rubber, the molecular chain of nitrile rubber contains a large amount of acrylonitrile, and the highly branched structure and high vinyl acetate content of EVM can not only bring about a significant improvement in oil resistance, but also can utilize the chemical bonding between vinyl acetate groups and acrylonitrile groups to promote better interface bonding in the cross-linking system of the three, so that EPDM rubber, nitrile rubber and EVM show excellent bonding and compatibility in the oil-resistant EPDM hose material, and the corresponding effects can be more fully exerted, and the obtained oil-resistant EPDM hose material can also show relatively excellent oil resistance and heat aging resistance, and the overall application quality is significantly improved.

[0009] Preferably, the raw material of the oil-resistant EPDM hose material further comprises 4-8 parts by weight of a functional additive, the functional additive is composed of zinc methacrylate and modified carbon nanotubes, and the weight ratio of zinc methacrylate to modified carbon nanotubes is 1:(3-8); The modified carbon nanotubes are prepared by the following method: S1, subjecting the carbon nanotube raw material to acid purification and ball milling to obtain pretreated carbon nanotubes; S2. Prepare a nickel chloride solution with ethanol as solvent, adjust the pH value of the solution with nitric acid, then add the pretreated carbon nanotubes for immersion and ultrasonic treatment, take out and dry, and obtain modified carbon nanotubes.

[0010] By adopting the above technical scheme, the molecular structure of zinc methacrylate has ionic bonds formed by metal cations and carboxylate anions, which can form an interpenetrating network with the rubber cross-linking network and modify the microscopic interface, thereby improving the binding and compatibility between EPDM rubber, nitrile rubber and EVM; the modified carbon nanotubes are obtained by rare earth modification of carbon nanotube raw materials, and the network structure formed by them can limit the movement of molecular chains. The rare earth nickel distributed on their surface can not only improve the high-temperature antioxidant performance, but also show strong binding with rubber molecules, and bring a strong improvement to the interface performance between EPDM rubber, nitrile rubber and EVM; and when zinc methacrylate and modified carbon nanotubes are used in combination as functional additives, the two can play an excellent compounding and synergistic role with each other, which can significantly enhance the binding and compatibility of EPDM rubber, nitrile rubber and EVM in oil-resistant EPDM hose materials, thereby making the obtained oil-resistant EPDM hose materials show more excellent oil resistance and heat aging resistance, and the overall application quality is improved.

[0011] Preferably, the weight ratio of the zinc methacrylate to the modified carbon nanotubes is 1:5.

[0012] By adopting the above technical scheme, when the zinc methacrylate and modified carbon nanotubes in the above weight ratio are used in combination, the corresponding effect brought about by the compounding with each other is relatively excellent, and the bonding and compatibility of EPDM rubber, nitrile rubber and EVM in the oil-resistant EPDM hose material can be better improved, and an oil-resistant EPDM hose material with outstanding oil resistance and heat aging resistance can be obtained.

[0013] Preferably, the concentration of the nickel chloride solution is 2-3 mol / mL, and the mixing ratio of the pretreated carbon nanotubes and the nickel chloride solution is (1500-2000) mL:1 mg.

[0014] By adopting the above technical scheme, the nickel chloride solution of the above concentration is mixed and modified with the pretreated carbon nanotubes in the above proportion, so that the nickel can be more evenly combined with the surface of the carbon nanotubes, and modified carbon nanotubes with a high surface area are obtained, thereby enabling the modified carbon nanotubes to fully exert their corresponding effects in the oil-resistant EPDM hose material.

[0015] Preferably, the plasticizer is one or a combination of phthalates, fatty dibasic acid esters, fatty acids, phosphates, polyesters and epoxies.

[0016] By adopting the above technical scheme, the plasticizer can reduce the interaction force between rubber molecules, improve the processing performance of rubber, and promote the dispersion and combination between rubber and other raw materials. The above types of plasticizers are suitable for the preparation of oil-resistant EPDM hose materials, and can obtain oil-resistant EPDM hose materials with excellent and stable quality.

[0017] Preferably, the vulcanizing agent is one or a combination of peroxides, sulfur-containing compounds, quinone oximes, sulfur and their derivatives.

[0018] By adopting the above technical scheme, the vulcanizing agent can cause cross-linking reaction of the rubber molecular chain, transforming the linear molecular structure into a three-dimensional network structure, so that the rubber has both elasticity and strength, and the above types of vulcanizing agents are suitable for the preparation of oil-resistant EPDM hose materials, and can obtain oil-resistant EPDM hose materials with excellent and stable quality.

[0019] Preferably, the accelerator is one or a combination of thiazoles, sulfenamides, thiurams, dithiocarbamates and guanidines.

[0020] By adopting the above technical scheme, the above types of vulcanizing agents can fully act on the cross-linking reaction between the vulcanizing agent and the rubber molecules, which can not only shorten the vulcanization time and improve the production efficiency, but also reduce the temperature required for the vulcanization reaction, reduce energy consumption, and reduce production costs; at the same time, the above vulcanizing agents can also enable EPDM rubber, nitrile rubber and EVM to fully and stably interact with each other during the process of mixing to prepare oil-resistant EPDM hose materials, thereby obtaining oil-resistant EPDM hose materials with excellent and stable quality.

[0021] In a second aspect, the present application provides a method for preparing an oil-resistant EPDM hose material, using the following technical solution: A method for preparing an oil-resistant EPDM hose material comprises the following steps: (1) Prepare raw materials including EPDM rubber, nitrile rubber, white carbon black, kaolin, plasticizer, zinc oxide, stearic acid, silane coupling agent, EVM, titanium dioxide, vulcanizer and accelerator according to the proportion; (2) mixing the EPDM rubber, nitrile rubber, EVM, zinc oxide and stearic acid in step (1), and then adding kaolin, titanium dioxide, silane coupling agent, white carbon black and plasticizer to continue mixing, and discharging to obtain a rubber material; (3) After the rubber material obtained in step (2) is allowed to stand for a while, a vulcanizing agent and an accelerator are added for mixing. After the mixing is completed, the rubber material is turned over and finally sheeted to obtain an oil-resistant EPDM hose material.

[0022] By adopting the above technical scheme, the above preparation method is simple to operate, and each raw material is added and used in steps during the process, which is not only easy to control the quality during the process, but also enables each component raw material to fully play its role, thereby obtaining an oil-resistant EPDM hose material with excellent quality and stability, and can also be suitable for large-scale industrial production.

[0023] Preferably, the preparation method of the oil-resistant EPDM hose material comprises the following steps: (1) Prepare raw materials including EPDM rubber, nitrile rubber, white carbon black, kaolin, plasticizer, zinc oxide, stearic acid, silane coupling agent, EVM, titanium dioxide, vulcanizer and accelerator according to the proportion; (2) The EPDM rubber, nitrile rubber, EVM, zinc oxide and stearic acid in step (1) are mixed at 110-120° C. for 1-2 min, and kaolin, titanium dioxide, silane coupling agent, white carbon black and plasticizer are added and mixed at 110-120° C. for 5-8 min, and the rubber material is discharged; (3) The rubber material obtained in step (2) is allowed to stand at 25-30°C for 20-28h, after which a vulcanizing agent and an accelerator are added for mixing, and mixing is performed at 110-120°C for 2-3min. After the mixing is completed, the rubber material is further mixed and turned over at 25-30°C for 4-6min at a mixing speed of 30-40r / min, and finally the oil-resistant EPDM hose material is obtained by sheeting.

[0024] By adopting the above technical scheme, in each step of the preparation of the oil-resistant EPDM hose material, the operation control of the above parameters can make the various component raw materials fully combined and play a role, especially for the cross-linking system of EPDM rubber, nitrile rubber and EVM, which can make them show better bonding and compatibility with each other, and the obtained oil-resistant EPDM hose material is also relatively stable and excellent in oil resistance and heat aging resistance.

[0025] In summary, this application has the following beneficial effects: 1. Since the present application adopts nitrile rubber and EVM compound to act on EPDM rubber, it can not only bring about a significant improvement in oil resistance, but also enable EPDM rubber, nitrile rubber and EVM to show excellent bonding and compatibility in the oil-resistant EPDM hose material, and thus can play a far closer to expected effect, so that the final oil-resistant EPDM hose material can show relatively excellent oil resistance and heat aging resistance, and the overall application quality is significantly improved; 2. The functional additives composed of zinc methacrylate and modified carbon nanotubes added in this application can not only improve the oil resistance and heat aging resistance through the characteristics of the raw materials themselves, but also act on the interface between EPDM rubber, nitrile rubber and EVM, and bring about an excellent improvement in the bonding and compatibility of the three, so that the obtained oil-resistant EPDM hose material exhibits more excellent oil resistance and heat aging resistance, and the overall application quality is further improved. DETAILED DESCRIPTION

[0026] The present application is further described in detail below in combination with preparation examples, embodiments and comparative examples.

[0027] Unless otherwise specified, the raw materials used in the preparation examples, embodiments and comparative examples of the present application are commercially available: EPDM rubber was purchased from Dow NORDEL™ EPDM IP 4640 L in the United States; The nitrile rubber purchased from LANXESS was NBR 3340F; EVM was purchased from Sheng Wanjia SWJ-99; The carbon nanotube raw material was purchased from Zhongke Leiming (Beijing) Technology Co., Ltd., with a diameter of 10 nm and a length of 10 μm.

[0028] Preparation examples of raw materials and / or intermediates Preparation Example 1, A modified carbon nanotube is prepared by the following method: S1, purifying the carbon nanotube raw material with nitric acid and ball milling it with a stainless steel ball mill for 2 hours to obtain pretreated carbon nanotubes; S2. Prepare a nickel chloride solution with ethanol as solvent, adjust the pH value of the solution to 6 with nitric acid, then add the pretreated carbon nanotubes for immersion and ultrasonic treatment, ultrasonic treatment at 300W for 15h, take out and dry, and obtain modified carbon nanotubes.

[0029] Note: The concentration of nickel chloride solution is 2.5 mol / mL, and the mixing ratio of pretreated carbon nanotubes and nickel chloride solution is 1750 mL:1 mg.

[0030] Preparation Example 2 A modified carbon nanotube, which is different from Preparation Example 1 in that the concentration of the nickel chloride solution is 2 mol / mL, and the mixing ratio of the pretreated carbon nanotube and the nickel chloride solution is 1500 mL:1 mg.

[0031] Preparation Example 3 A modified carbon nanotube, which is different from Preparation Example 1 in that the concentration of the nickel chloride solution is 3 mol / mL, and the mixing ratio of the pretreated carbon nanotube and the nickel chloride solution is 2000 mL:1 mg.

[0032] Example 1 An oil-resistant EPDM hose material, the raw materials used for preparation and their corresponding weights are shown in Table 1, and the material is prepared by the following steps: (1) Prepare raw materials including EPDM rubber, nitrile rubber, white carbon black, kaolin, plasticizer, zinc oxide, stearic acid, silane coupling agent, EVM, titanium dioxide, vulcanizer and accelerator according to the proportion; (2) The EPDM rubber, nitrile rubber, EVM, zinc oxide and stearic acid in step (1) are mixed at 115° C. for 1.5 min, and kaolin, titanium dioxide, silane coupling agent, white carbon black and plasticizer are added and mixed at 115° C. for 6.5 min, and the rubber compound is obtained; (3) After the rubber obtained in step (2) is allowed to stand at 25°C for 24 hours, a vulcanizing agent and an accelerator are added for mixing, and mixing is performed at 115°C for 2.5 minutes. After the mixing is completed, the rubber is further mixed and turned over at 25°C for 5 minutes at a mixing speed of 35 r / min. Finally, the oil-resistant EPDM hose material is obtained by sheeting.

[0033] Note: In the above operation, the plasticizer is phthalate; the vulcanizing agent is sulfur; the accelerator is tetramethylthiuram disulfide; and during the process of adding and mixing the raw materials, the mixing speed is 50r / min.

[0034] Example 2 An oil-resistant EPDM hose material, which is different from Example 1 in that it is prepared by the following steps: (1) Prepare raw materials including EPDM rubber, nitrile rubber, white carbon black, kaolin, plasticizer, zinc oxide, stearic acid, silane coupling agent, EVM, titanium dioxide, vulcanizer and accelerator according to the proportion; (2) The EPDM rubber, nitrile rubber, EVM, zinc oxide and stearic acid in step (1) are mixed at 110° C. for 2 min, and kaolin, titanium dioxide, silane coupling agent, white carbon black and plasticizer are added and mixed at 110° C. for 8 min, and the rubber material is discharged; (3) After the rubber obtained in step (2) is allowed to stand at 30°C for 20 hours, a vulcanizing agent and an accelerator are added for mixing, and mixing is performed at 110°C for 3 minutes. After the mixing is completed, the rubber is further mixed and turned over, and the mixing and turning is performed at 30°C for 4 minutes at a mixing speed of 30 r / min. Finally, the oil-resistant EPDM hose material is obtained by sheeting.

[0035] Example 3 An oil-resistant EPDM hose material, which is different from Example 1 in that it is prepared by the following steps: (1) Prepare raw materials including EPDM rubber, nitrile rubber, white carbon black, kaolin, plasticizer, zinc oxide, stearic acid, silane coupling agent, EVM, titanium dioxide, vulcanizer and accelerator according to the proportion; (2) The EPDM rubber, nitrile rubber, EVM, zinc oxide and stearic acid in step (1) are mixed at 120° C. for 1 min, and kaolin, titanium dioxide, silane coupling agent, white carbon black and plasticizer are added and mixed at 120° C. for 5 min, and the rubber material is discharged; (3) The rubber obtained in step (2) is allowed to stand at 27.5°C for 28 hours, and then a vulcanizer and an accelerator are added for mixing. The mixing is performed at 120°C for 2 minutes. After the mixing is completed, the rubber is further mixed and turned over. The mixing is performed at 27.5°C for 6 minutes at a mixing speed of 40 r / min. Finally, the oil-resistant EPDM hose material is obtained by sheeting.

[0036] Embodiment 4-5 An oil-resistant EPDM hose material, which is different from Example 1 in that the raw materials used for preparation and their corresponding weights are shown in Table 1.

[0037] Table 1 Raw materials used in the preparation of Examples 1-5 and their weight portions (kg / portion) raw material Example 1 Example 2 Example 3 Example 4 Example 5 EPDM Rubber 70 70 70 65 75 Nitrile rubber 30 30 30 35 25 White Carbon Black 30 30 30 20 40 Kaolin 85 85 85 100 70 Plasticizers 12.5 12.5 12.5 10 15 Zinc Oxide 4 4 4 3 5 Stearic acid 1.5 1.5 1.5 1 2 Silane coupling agent 2 2 2 1 3 EVM 5 5 5 4 6 Titanium dioxide 2 2 2 3 1 Vulcanizing agent 4 4 4 3 5 Accelerator 2 2 2 1 3

[0038] Example 6 An oil-resistant EPDM hose material is different from Example 1 in that 6 parts by weight of a functional additive are further added to the raw material of the oil-resistant EPDM hose material, the functional additive is composed of zinc methacrylate and modified carbon nanotubes in a weight ratio of 1:5.5, and the functional additive and the modified carbon nanotubes are obtained in Preparation Example 1, and are specifically added and used in step (2). The operation of step (2) is: The EPDM rubber, nitrile rubber, EVM, zinc oxide and stearic acid in step (1) are mixed at 115° C. for 1.5 min, and kaolin, titanium dioxide, silane coupling agent, white carbon black, plasticizer and functional additive are added and mixed for 6.5 min at 115° C. to obtain a rubber compound.

[0039] Example 7 An oil-resistant EPDM hose material, which is different from Example 6 in that the weight parts of the functional additive added is 4 parts.

[0040] Example 8 An oil-resistant EPDM hose material, which is different from Example 6 in that the weight parts of the functional additive added is 8 parts.

[0041] Example 9 An oil-resistant EPDM hose material, which is different from Example 6 in that the functional additive is composed of zinc methacrylate and modified carbon nanotubes in a weight ratio of 1:5.5.

[0042] Example 10 An oil-resistant EPDM hose material, which is different from Example 6 in that the functional additive consists of zinc methacrylate and modified carbon nanotubes in a weight ratio of 1:3.

[0043] Embodiment 11 An oil-resistant EPDM hose material, which is different from Example 6 in that the functional additive consists of zinc methacrylate and modified carbon nanotubes in a weight ratio of 1:8.

[0044] Example 12 An oil-resistant EPDM hose material, which is different from Example 6 in that the modified carbon nanotubes are obtained from Preparation Example 2.

[0045] Embodiment 13 An oil-resistant EPDM hose material, which is different from Example 6 in that the modified carbon nanotubes are obtained from Preparation Example 3.

[0046] Embodiment 14 An oil-resistant EPDM hose material, which is different from Example 6 in that zinc methacrylate is not used in the functional additive.

[0047] Embodiment 15 An oil-resistant EPDM hose material, which is different from Example 6 in that modified carbon nanotubes are not used in the functional additive.

[0048] Example 16 An oil-resistant EPDM hose material, which is different from Example 6 in that the modified carbon nanotubes are replaced with carbon nanotube raw materials.

[0049] Embodiment 17 An oil-resistant EPDM hose material, which is different from Example 16 in that zinc methacrylate is not used in the functional additive.

[0050] Comparative Example 1 An oil-resistant EPDM hose material, which is different from Example 1 in that nitrile rubber and EVM are replaced with EPDM rubber.

[0051] Comparative Example 2 An oil-resistant EPDM hose material, which is different from Example 1 in that the nitrile rubber is replaced with EPDM rubber.

[0052] Comparative Example 3 An oil-resistant EPDM hose material, which is different from Example 1 in that EVM is replaced with EPDM rubber.

[0053] Performance testing Test samples: The oil-resistant EPDM hose material obtained in Example 1-17 was used as test sample 1-17, and the oil-resistant EPDM hose material obtained in Comparative Example 1-3 was used as control sample 1-3.

[0054] Test method: Test samples 1-17 and control samples 1-3 were tested as follows: 3# standard oil resistance (100℃x72h) test, UV fatigue resistance test (220V / 254mm) test, hose low temperature resistance (-40℃*72h bending) test, ozone (40℃*70h*100pphm*20%) test, thermal aging performance (125℃x70h) test. In the thermal aging performance test, the standards are GB / T3512-2014 and ISO 188:2011, and the test items are hardness change (ShoreA), tensile strength change rate (%), and elongation at break change rate (%). After completing the above tests, the test results are recorded in Table 2 accordingly.

[0055] Table 2 Test results of test samples 1-17 and control samples 1-3

[0056] Combining Examples 1-5 and Comparative Examples 1-3 and Table 2, it can be seen that the use of nitrile rubber and EVM compounded to act on EPDM rubber can make the final oil-resistant EPDM hose material exhibit relatively excellent oil resistance and heat aging resistance; and if any one of nitrile rubber and EVM is acted on EPDM rubber, although it can bring about the improvement of oil resistance and heat aging resistance, the improvement effect is limited, which is far less than the excellent effect brought by the compound of nitrile rubber and EVM on EPDM rubber. It can be judged that EPDM rubber, nitrile rubber and EVM can show excellent bonding and compatibility in the oil-resistant EPDM hose material, and thus the improvement of oil resistance and heat aging resistance is more significant.

[0057] Combining Example 1 and Example 6-13 with Table 2, it can be seen that the addition of a functional additive composed of zinc methacrylate and modified carbon nanotubes can further improve the oil resistance and heat aging resistance of the oil-resistant EPDM hose material. When the weight ratio of zinc methacrylate to modified carbon nanotubes is 1:5, the improvement effect brought by the functional additive is better. Combining Example 14-15 with Table 2, it can be seen that if any one of zinc methacrylate and modified carbon nanotubes is used alone as a functional additive, the oil resistance and heat aging resistance of the obtained oil-resistant EPDM hose material are not good after the above test, but the sum of the improvement effects of zinc methacrylate and modified carbon nanotubes applied separately is far less than the excellent combination of the two. It can be seen that the combination of zinc methacrylate and modified carbon nanotubes can bring a significant improvement effect of 1+1>2. Combined with Examples 16-17 and Table 2, it can be seen that if carbon nanotube raw materials are used to replace modified carbon nanotubes, not only is the performance in improving oil resistance and heat aging resistance poor, but also after being used in combination with zinc methacrylate, it can only bring about a simple superposition of effects, and cannot play an excellent compounding role. It can be seen that the combination of modified carbon nanotube group and zinc methacrylate has a significant effect on improving the oil resistance and heat aging resistance of oil-resistant EPDM hose materials.

[0058] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. An oil-resistant EPDM hose material, characterized in that: Made from the following raw materials in parts by weight: EPDM rubber 65-75 parts; 25-35 parts of nitrile rubber; 20-40 parts of white carbon black; Kaolin 70-100 parts; 10-15 parts of plasticizer; 3-5 parts of zinc oxide; 1-2 parts of stearic acid; 1-3 parts of silane coupling agent; EVM 4-6 copies; 1-3 parts of titanium dioxide; 3-5 parts of vulcanizing agent; 1-3 parts of accelerator; The raw materials of the oil-resistant EPDM hose material are further added with 4-8 parts by weight of a functional additive, the functional additive is composed of zinc methacrylate and modified carbon nanotubes, and the weight ratio of zinc methacrylate to modified carbon nanotubes is 1:(3-8); The modified carbon nanotubes are prepared by the following method: S1, subjecting the carbon nanotube raw material to acid purification and ball milling to obtain pretreated carbon nanotubes; S2. Prepare a nickel chloride solution with ethanol as solvent, adjust the pH value of the solution with nitric acid, then add the pretreated carbon nanotubes for immersion and ultrasonic treatment, take out and dry, and obtain modified carbon nanotubes.

2. The oil-resistant EPDM hose material according to claim 1, characterized in that: The weight ratio of the zinc methacrylate to the modified carbon nanotubes is 1:

5.

3. The oil-resistant EPDM hose material according to claim 1, characterized in that: The concentration of the nickel chloride solution is 2-3 mol / mL, and the mixing ratio of the pretreated carbon nanotubes and the nickel chloride solution is (1500-2000) mL:1 mg.

4. The oil-resistant EPDM hose material according to claim 1, characterized in that: The plasticizer is one or a combination of phthalates, fatty dibasic acid esters, fatty acids, phosphates, polyesters and epoxies.

5. The oil-resistant EPDM hose material according to claim 1, characterized in that: The vulcanizing agent is one or a combination of peroxides, sulfur-containing compounds, quinone oximes, sulfur and their derivatives.

6. The oil-resistant EPDM hose material according to claim 1, characterized in that: The accelerator is one or a combination of thiazoles, sulfenamides, thiurams, dithiocarbamates and guanidines.

7. The method for preparing the oil-resistant EPDM hose material according to claim 1, characterized in that: The following steps are involved: (1) Prepare raw materials including EPDM rubber, nitrile rubber, white carbon black, kaolin, plasticizer, zinc oxide, stearic acid, silane coupling agent, EVM, titanium dioxide, vulcanizer, accelerator and functional additives according to the proportion; (2) mixing the EPDM rubber, nitrile rubber, EVM, zinc oxide and stearic acid in step (1), and then adding kaolin, titanium dioxide, silane coupling agent, white carbon black, plasticizer and functional additives to continue mixing, and discharging to obtain a rubber material; (3) After the rubber material obtained in step (2) is allowed to stand for a period of time, a vulcanizing agent and an accelerator are added for mixing. After the mixing is completed, the rubber material is turned over and finally sheeted to obtain an oil-resistant EPDM hose material.

8. The method for preparing the oil-resistant EPDM hose material according to claim 7, characterized in that: The following steps are involved: (1) Prepare raw materials including EPDM rubber, nitrile rubber, white carbon black, kaolin, plasticizer, zinc oxide, stearic acid, silane coupling agent, EVM, titanium dioxide, vulcanizer, accelerator and functional additives according to the proportion; (2) The EPDM rubber, nitrile rubber, EVM, zinc oxide and stearic acid in step (1) are mixed at 110-120° C. for 1-2 min, and kaolin, titanium dioxide, silane coupling agent, white carbon black, plasticizer and functional additive are added and mixed at 110-120° C. for 5-8 min, and the rubber material is discharged; (3) The rubber material obtained in step (2) is allowed to stand at 25-30°C for 20-28h, after which a vulcanizing agent and an accelerator are added for mixing, and mixing is performed at 110-120°C for 2-3min. After the mixing is completed, the rubber material is further mixed and turned over at 25-30°C for 4-6min at a mixing speed of 30-40r / min, and finally the oil-resistant EPDM hose material is obtained by sheeting.

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