Hydrogenated nitrile rubber cutting ribbed belt and preparation method thereof

Abstract

The invention relates to the field of ribbed belts, and particularly discloses a hydrogenated butadiene-acrylonitrile rubber cutting ribbed belt and a preparation method thereof. The hydrogenated nitrile rubber cutting ribbed belt comprises a strong cord and a composite rubber sheet, and the composite rubber sheet comprises the following raw materials in parts by weight: 90-110 parts of hydrogenated nitrile rubber, 5-10 parts of aramid fiber, 30-50 parts of a reinforcing agent, 1-5 parts of a vulcanizing agent, 1-3 parts of an accelerant, 5-10 parts of a softening agent and 1-3 parts of an anti-aging agent; the reinforcing agent comprises polytetrafluoroethylene, an activating agent and reinforcing filler; according to the hydrogenated butadiene-acrylonitrile rubber cutting poly V-belt prepared by the invention, the reinforcing agent is compounded by the polytetrafluoroethylene, the reinforcing filler and the activating agent and can form a tighter network structure with a hydrogenated butadiene-acrylonitrile rubber matrix, so that the strength, wear resistance and tear resistance of the poly V-belt are improved.

Description

Technical Field

[0001] The present application relates to the field of multi-V belts, and in particular to a hydrogenated nitrile rubber cut multi-V belt and a preparation method thereof. Background Art

[0002] Existing traditional multi-V belts are usually made of natural rubber, chloroprene rubber, EPDM rubber and other materials, which can meet certain needs under normal conditions. However, with the continuous advancement of industrial production, the operating environment of equipment is becoming increasingly complex and harsh. In some high-temperature and oil-rich environments, multi-V belts made of traditional materials are prone to swelling and softening, resulting in belt transmission failure.

[0003] As a high-performance synthetic rubber material, hydrogenated nitrile rubber has excellent oil resistance, wear resistance and heat aging resistance, and is widely used in the automotive industry and other high-reliability industries. Existing hydrogenated nitrile rubber multi-V belts are made by compression molding or vulcanization. During use, they have problems with insufficient flexibility and fatigue resistance, especially under long-term operating conditions, they are prone to wear and even breakage, thereby reducing the stability and service life of the transmission system. Summary of the invention

[0004] In order to improve the durability of a hydrogenated nitrile rubber multi-V belt, the present application provides a hydrogenated nitrile rubber cut multi-V belt and a preparation method thereof.

[0005] In a first aspect, the present application provides a hydrogenated nitrile rubber cut multi-V belt, which adopts the following technical solution: A hydrogenated nitrile rubber cut multi-V belt comprises a strong cord and a composite film, wherein the composite film comprises the following raw materials in parts by weight: 90-110 parts of hydrogenated nitrile raw rubber, 5-10 parts of aramid fiber, 30-50 parts of a reinforcing agent, 1-5 parts of a vulcanizing agent, 1-3 parts of an accelerator, 5-10 parts of a softening agent, and 1-3 parts of an antioxidant; the reinforcing agent comprises polytetrafluoroethylene, an activator, and a reinforcing filler.

[0006] By adopting the above technical scheme, the multi-V belt prepared with hydrogenated nitrile rubber as raw material has excellent heat resistance, oil resistance, wear resistance and aging resistance, and can operate stably for a long time in high temperature, high load and oily environment. Aramid fiber can form a mechanical lock with the hydrogenated nitrile rubber matrix, and aramid fiber can transfer stress when subjected to force, reduce stress concentration, and improve the strength, wear resistance and tear resistance of the multi-V belt. Aramid fiber and polytetrafluoroethylene have high toughness and thermal stability, prevent the expansion of cracks, and can still maintain the structural stability of the multi-V belt at high temperature. It is not easy to soften or decompose, and can improve the durability and toughness of the multi-V belt at high temperature.

[0007] Polytetrafluoroethylene has a low friction coefficient and high self-lubricating effect. When added to the composite rubber raw material, it can reduce the friction of the multi-V belt during transmission and improve the fatigue resistance and wear resistance of the multi-V belt. Polytetrafluoroethylene can form a tighter network structure with reinforcing fillers, activators and hydrogenated nitrile rubber matrix, thereby improving the strength and wear resistance of the multi-V belt.

[0008] Preferably, the mass ratio of the polytetrafluoroethylene, the activator and the reinforcing filler is 1:(0.5-0.8):(0.8-1).

[0009] Preferably, the activator raw materials include zinc oxide and magnesium oxide.

[0010] By adopting the above technical solution, zinc oxide and magnesium oxide can activate the vulcanization system, promote the cross-linking between hydrogenated nitrile rubber molecular chains, form a denser cross-linking network, and improve the cross-linking density, strength and heat resistance of hydrogenated nitrile rubber. At the same time, the compound use of zinc oxide and magnesium oxide can use magnesium oxide to appropriately reduce the activity of zinc oxide, play a role in slowing down the vulcanization rate, and reduce the phenomenon of early cross-linking of hydrogenated nitrile rubber.

[0011] Preferably, the activator raw material further includes methacrylic acid, and the mass ratio of zinc oxide, magnesium oxide and methacrylic acid is (1.5-2):(1-1.5):3.

[0012] Preferably, the zinc oxide and magnesium oxide react with methacrylic acid to generate zinc methacrylate and magnesium methacrylate in situ, respectively.

[0013] By adopting the above technical scheme, zinc oxide and magnesium oxide react with methacrylic acid to generate zinc methacrylate and magnesium methacrylate in situ respectively. Zinc methacrylate and magnesium methacrylate can act as cross-linking agents to form chemical bonds with hydrogenated nitrile rubber molecular chains during the vulcanization process, increase cross-linking points, improve the tensile strength and tear strength of the hydrogenated nitrile rubber composite film, and improve the toughness and wear resistance of the multi-V belt.

[0014] Preferably, the reinforcing filler is at least one of carbon black, graphite, silica and carbon nanotubes.

[0015] By adopting the above technical scheme, carbon black, graphite, silica and carbon nanotubes are added to the composite film raw material, which can improve the tensile strength, tear strength and fatigue resistance of the hydrogenated nitrile rubber composite film, reduce the wear of the hydrogenated nitrile rubber multi-V belt in transmission friction, and improve the durability and fatigue resistance of the hydrogenated nitrile rubber multi-V belt.

[0016] Carbon nanotubes can enhance the strength and fatigue resistance of hydrogenated nitrile rubber multi-ribbed belts. When subjected to external loads, the special tubular structure of carbon nanotubes can disperse stress along the tube wall, and one layer of fracture will trigger another layer of fracture, thereby slowing down the cracking of hydrogenated nitrile rubber multi-ribbed belts, inhibiting further crack expansion, and improving the tear and wear resistance of hydrogenated nitrile rubber multi-ribbed belts. At the same time, carbon nanotubes can form a filling network in the hydrogenated nitrile rubber matrix, quickly dissipating the heat in the hydrogenated nitrile rubber sheet system, reducing the thermal fatigue loss of hydrogenated nitrile rubber multi-ribbed belts, and improving the durability and strength of hydrogenated nitrile rubber multi-ribbed belts.

[0017] Preferably, the vulcanizing agent is one of dicumyl peroxide, di-tert-butylcumyl peroxide and sulfur.

[0018] Preferably, the strong cord is one of glass fiber, carbon fiber and polyester fiber.

[0019] In a second aspect, the present application provides a method for preparing a hydrogenated nitrile rubber cut multi-V belt, using the following technical solution: A method for preparing a hydrogenated nitrile rubber cut multi-V belt comprises the following specific steps: The hydrogenated nitrile rubber, aramid fiber, reinforcing agent, vulcanizing agent, accelerator, softener and antioxidant are mixed and extruded, the mixed rubber material is pressed into a composite film, and then the composite film and a strong cord are vulcanized to obtain a hydrogenated nitrile rubber cut multi-V belt.

[0020] By adopting the above technical solution, the strong cord is used as a reinforcing skeleton and is vulcanized and combined with the composite film to form a whole. The high tensile strength and stability of the strong cord provide support for the hydrogenated nitrile rubber cutting multi-V belt, thereby improving the strength and fatigue resistance of the hydrogenated nitrile rubber cutting multi-V belt.

[0021] In summary, this application has the following beneficial effects: 1. Since the present application adopts hydrogenated nitrile rubber to compound with aramid fiber, polytetrafluoroethylene, activator and reinforcing filler to form a composite film, the aramid fiber can transfer stress when subjected to force, reduce stress concentration, and improve the strength, wear resistance and tear resistance of the multi-V belt. Polytetrafluoroethylene has a low friction coefficient and high self-lubricating effect, and forms a tighter network structure with the hydrogenated nitrile rubber matrix, thereby improving the strength and wear resistance of the multi-V belt.

[0022] 2. In the present application, zinc oxide and magnesium oxide are used to react with methacrylic acid to generate zinc methacrylate and magnesium methacrylate in situ, respectively, which form chemical bonds with the hydrogenated nitrile rubber molecular chains during the vulcanization process, increase the cross-linking points, improve the tensile strength and tear strength of the hydrogenated nitrile rubber, and improve the toughness and wear resistance of the multi-V belt. DETAILED DESCRIPTION

[0023] The present application is further described in detail below with reference to the embodiments.

[0024] All raw materials in the examples are commercially available. Example

[0025] Example 1 The present embodiment provides a hydrogenated nitrile rubber cut multi-V belt, including a strong cord and a composite film, the composite film including the following raw materials by weight: 100kg of hydrogenated nitrile rubber, 8kg of aramid fiber, 40kg of reinforcing agent, 3kg of vulcanizing agent, 2kg of accelerator, 8kg of softener, and 2kg of antioxidant; the reinforcing agent includes polytetrafluoroethylene, an activator, and a reinforcing filler. The mass ratio of polytetrafluoroethylene, activator, and reinforcing filler is 1:0.7:0.9, wherein the vulcanizing agent is diisopropylbenzene peroxide, the antioxidant is purchased from Haian Petrochemical 4020 type antioxidant, the accelerator is MDB, the softener is paraffin oil, the activator is zinc oxide, the reinforcing filler is carbon black, the strong cord is glass fiber, and the hydrogenated nitrile rubber brand is Therban C4367.

[0026] The method for preparing a hydrogenated nitrile rubber cut multi-V belt comprises the following specific steps: The hydrogenated nitrile rubber, aramid fiber, reinforcing agent, vulcanizing agent, accelerator, softener and antioxidant are mixed, extruded at 90°C to obtain a mixed rubber material, which is then calendered to obtain a composite rubber sheet, and then the composite rubber sheet and a strong cord are vulcanized at 160°C to obtain a hydrogenated nitrile rubber cut multi-V belt.

[0027] Example 2 The difference between Example 2 and Example 1 is that the amount of hydrogenated nitrile rubber used in the composite film raw material is 90 kg, the amount of aramid fiber used is 10 kg, the amount of reinforcing agent used is 50 kg, the amount of vulcanizing agent used is 1 kg, the amount of accelerator used is 1 kg, the amount of softener used is 5 kg, and the amount of antioxidant used is 1 kg.

[0028] Example 3 The difference between Example 3 and Example 1 is that the amount of hydrogenated nitrile rubber used in the composite film raw material is 110 kg, the amount of aramid fiber used is 5 kg, the amount of reinforcing agent used is 30 kg, the amount of vulcanizing agent used is 5 kg, the amount of accelerator used is 3 kg, the amount of softener used is 10 kg, and the amount of antioxidant used is 3 kg.

[0029] Example 4 The difference between Example 4 and Example 1 is that the reinforcing filler in the composite film raw material is a mixture of silicon dioxide and carbon nanotubes, and the mass ratio of silicon dioxide to carbon nanotubes is 1:1.

[0030] The method for preparing a hydrogenated nitrile rubber cut multi-V belt comprises the following specific steps: Silica and carbon nanotubes are mixed evenly to form a reinforcing filler, and then the reinforcing filler, activator and polytetrafluoroethylene are mixed and stirred evenly to form a reinforcing agent; hydrogenated nitrile rubber, aramid fiber, reinforcing agent, vulcanizing agent, accelerator, softener and antioxidant are mixed, extruded at 90°C to obtain a mixed rubber material, which is then calendered to obtain a composite film, and then the composite film and a strong cord are vulcanized at 160°C to obtain a hydrogenated nitrile rubber cut multi-V belt.

[0031] Example 5 The difference between Example 5 and Example 4 is that the activator raw material in the composite film raw material is a mixture of zinc oxide and magnesium oxide, and the mass ratio of zinc oxide to magnesium oxide is 1:1.

[0032] The method for preparing a hydrogenated nitrile rubber cut multi-V belt comprises the following specific steps: Silica and carbon nanotubes are mixed evenly to form a reinforcing filler, zinc oxide and magnesium oxide are mixed evenly to form an activator, and then the reinforcing filler, the activator and polytetrafluoroethylene are mixed and stirred evenly to form a reinforcing agent; hydrogenated nitrile rubber, aramid fiber, reinforcing agent, vulcanizing agent, accelerator, softener and antioxidant are mixed, extruded at 90°C to obtain a mixed rubber material, which is then calendered to obtain a composite film, and then the composite film and a strong cord are vulcanized at 160°C to obtain a hydrogenated nitrile rubber cut multi-V belt.

[0033] Example 6 The difference between Example 6 and Example 5 is that the activator raw materials in the composite film raw material are zinc oxide, magnesium oxide and methacrylic acid, wherein the mass ratio of zinc oxide, magnesium oxide and methacrylic acid is 1.8:1.3:3.

[0034] The method for preparing a hydrogenated nitrile rubber cut multi-V belt comprises the following specific steps: Silica and carbon nanotubes are mixed evenly to form a reinforcing filler, hydrogenated nitrile rubber is mixed with zinc oxide and magnesium oxide at 60°C, and then methyl acrylic acid is added and kneaded for 10 minutes, and then aramid fiber, reinforcing filler, polytetrafluoroethylene, vulcanizer, accelerator, softener and antioxidant are added and mixed, and extruded at 90°C to obtain a mixed rubber material, which is then calendered to obtain a composite film, and then the composite film and a strong cord are vulcanized at 160°C to obtain a hydrogenated nitrile rubber cut multi-V belt.

[0035] Example 7 The difference between Example 7 and Example 6 is that the activator raw materials in the composite film raw material are zinc oxide, magnesium oxide and methacrylic acid in a mass ratio of 1.5:1.5:3.

[0036] Example 8 The difference between Example 8 and Example 6 is that the activator raw materials in the composite film raw material are zinc oxide, magnesium oxide and methacrylic acid in a mass ratio of 2:1:3.

[0037] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the reinforcing agent in the composite film raw material is polytetrafluoroethylene.

[0038] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that no reinforcing agent is used in the composite film raw material.

[0039] Performance testing The following performance tests were conducted on the hydrogenated nitrile rubber cut multi-V belts provided in Examples 1-8 and Comparative Examples 1-2 of the present application. The specific test results are shown in Table 1.

[0040] Detection Methods 1. Tensile strength and elongation at break With reference to GB / T528-1998 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber", the tensile strength and elongation at break of the hydrogenated nitrile rubber cut multi-V belt prepared in this application were tested, and the tensile strength of the hydrogenated nitrile rubber cut multi-V belt was tested under the fatigue test conditions of 130°C × 24h.

[0041] 2. Wear resistance With reference to the standard GB / T 9867-2008 "Determination of wear resistance of vulcanized rubber or thermoplastic rubber", the wear volume of the hydrogenated nitrile rubber cut multi-V belt prepared in the present application was tested.

[0042] Table 1: Performance test results data table It can be seen from the performance test results that the hydrogenated nitrile rubber cutting multi-V belt prepared in the present application has good strength, wear resistance and tear resistance under the synergistic effect of each component. By comparing Comparative Examples 1-2 with Example 1, it can be seen that the present application uses polytetrafluoroethylene, reinforcing fillers and activators to synergistically enhance the strength of the hydrogenated nitrile rubber cutting multi-V belt as a reinforcing agent, on the one hand, it can improve the strength of the hydrogenated nitrile rubber cutting multi-V belt, on the other hand, it can reduce the friction during the transmission of the multi-V belt, enhance the thermal stability of the multi-V belt, and improve the fatigue resistance and wear resistance of the multi-V belt. Comparative Example 1 does not use reinforcing fillers and activators, and Comparative Example 2 does not use reinforcing agents. It can be seen from the performance test results that the strength and durability of the hydrogenated nitrile rubber cutting multi-V belt will decrease, cracks cannot be effectively suppressed, and the service life is seriously shortened.

[0043] 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. A hydrogenated nitrile rubber cut multi-V belt, characterized in that: The invention comprises a strong cord and a composite film, wherein the composite film comprises the following raw materials in parts by weight: 90-110 parts of hydrogenated nitrile rubber, 5-10 parts of aramid fiber, 30-50 parts of reinforcing agent, 1-5 parts of vulcanizing agent, 1-3 parts of accelerator, 5-10 parts of softening agent and 1-3 parts of antioxidant; the reinforcing agent comprises polytetrafluoroethylene, an activator and a reinforcing filler.

2. The hydrogenated nitrile rubber cut multi-V belt according to claim 1, characterized in that: The mass ratio of the polytetrafluoroethylene, the activator and the reinforcing filler is 1: (0.5-0.8): (0.8-1).

3. The hydrogenated nitrile rubber cut multi-V belt according to claim 2, characterized in that: The activator raw materials include zinc oxide and magnesium oxide.

4. The hydrogenated nitrile rubber cut multi-V belt according to claim 3, characterized in that: The activator raw material also includes methacrylic acid, and the mass ratio of zinc oxide, magnesium oxide and methacrylic acid is (1.5-2): (1-1.5):

3.

5. The hydrogenated nitrile rubber cut multi-V belt according to claim 3, characterized in that: The zinc oxide and magnesium oxide react with methacrylic acid to generate zinc methacrylate and magnesium methacrylate in situ, respectively.

6. The hydrogenated nitrile rubber cut multi-V belt according to claim 2, characterized in that: The reinforcing filler is at least one of carbon black, graphite, silicon dioxide and carbon nanotubes.

7. The hydrogenated nitrile rubber cut multi-V belt according to claim 1, characterized in that: The vulcanizing agent is one of dicumyl peroxide, di-tert-butylcumyl peroxide and sulfur.

8. The hydrogenated nitrile rubber cut multi-V belt according to claim 1, characterized in that: The strong cord is one of glass fiber, carbon fiber and polyester fiber.

9. A method for preparing a hydrogenated nitrile rubber cut multi-V belt according to any one of claims 1 to 8, characterized in that: The specific steps include: The hydrogenated nitrile rubber, aramid fiber, reinforcing agent, vulcanizing agent, accelerator, softener and antioxidant are mixed and extruded, the mixed rubber material is pressed into a composite film, and then the composite film and a strong cord are vulcanized to obtain a hydrogenated nitrile rubber cut multi-V belt.

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