Integrally-formed oil seal and manufacturing process thereof

Abstract

The invention discloses an integrally formed oil seal and a manufacturing process thereof, and relates to the technical field of oil seals, the integrally formed oil seal comprises the following raw materials by weight: 60-80 parts of hydrogenated nitrile rubber, 5-15 parts of lignin, 8-20 parts of wollastonite, 5-10 parts of aramid fiber, 1-5 parts of siloxane, 10-40 parts of carbon black, 1-5 parts of a vulcanizing agent and 1-3 parts of an auxiliary agent. Through use of hydrogenated nitrile rubber, siloxane and aramid fiber, the oil seal has good corrosion resistance, heat resistance and excellent mechanical properties, can effectively resist corrosion of external chemical substances in equipment application of lithium battery diaphragm processing, can prevent aging and failure of the oil seal, ensures stable sealing performance, and has a good application prospect in lithium battery diaphragm processing. And good chemical resistance can prevent leakage of chemical substances inside and outside the unit, so that the internal environment of the equipment is kept clean, and the processing process is guaranteed to be carried out smoothly.

Description

Technical Field

[0001] The invention relates to the technical field of oil seals, and in particular to an integrally formed oil seal and a manufacturing process thereof. Background Art

[0002] An oil seal is a sealing device used to seal rotating shafts or reciprocating rods in mechanical equipment. Its main function is to prevent the leakage of lubricating oil or other working media, and to prevent external impurities such as dust and moisture from entering the equipment. Lithium battery diaphragm processing uses a variety of complex mechanical equipment, such as extruders, stretching equipment, etc. These devices have many rotating parts and transmission devices, such as motor bearings and gearboxes. In order to ensure that these parts can operate normally and reduce wear and friction, lubrication is required. Oil seals play a key role in this. They can prevent lubricating oil leakage and maintain a good lubrication environment inside the equipment.

[0003] At present, the processing of lithium battery diaphragms involves a variety of chemical substances, especially lithium battery electrolytes. Existing oil seals are difficult to withstand the chemical erosion of electrolytes. The organic solvents in the electrolyte have certain polarity and chemical activity, which will cause the rubber to swell, soften or even rupture, thereby causing oil seal failure, triggering electrolyte leakage, and affecting the normal operation of diaphragm processing equipment. Summary of the invention

[0004] The object of the present invention is to provide an integrally formed oil seal and a manufacturing process thereof, so as to solve the problems raised by the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: an integrally formed oil seal, comprising the following raw materials in parts by weight: 60 to 80 parts by weight of hydrogenated nitrile rubber, 5 to 15 parts by weight of lignin, 8 to 20 parts by weight of wollastonite, 5 to 10 parts by weight of aramid fiber, 1 to 5 parts by weight of siloxane, 10 to 40 parts by weight of carbon black, 1 to 5 parts by weight of a vulcanizing agent and 1 to 3 parts by weight of an additive.

[0006] Hydrogenated nitrile rubber has good oil resistance, heat resistance and excellent mechanical properties, and is suitable for working environments that require high temperature and chemical resistance. Aramid fiber provides excellent strength and heat resistance, and enhances the material's tear resistance and overall mechanical strength. Siloxane has good temperature resistance and flexibility, and improves the material's durability. Carbon black enhances the material's strength, tear resistance, wear resistance and heat resistance. Preferably, the vulcanizing agent is one of sulfur and peroxide.

[0007] Preferably, the auxiliary agent includes an antioxidant, an anti-ultraviolet agent and a lubricant.

[0008] A preparation process of an integrally formed oil seal comprises the following steps: S1. Accurately weigh hydrogenated nitrile rubber and add it into an internal mixer for plasticization. Then, add lignin, wollastonite, aramid fiber, siloxane, carbon black, vulcanizing agent and additives in sequence for mixing. Stir and mix continuously at 60-80° C. for 20-30 minutes. S2, filtering the mixed rubber material to remove impurities and bubbles; S3. Inject the mixed rubber raw materials into the oil seal mold to ensure that the material completely fills the mold cavity, and perform vulcanization molding. The vulcanization temperature is 160-180℃, the pressure is 10-20MPa, and the vulcanization time is 5-10min; S4. After vulcanization is completed, the oil seal is removed from the mold for cooling and trimming; S5. Post-process the vulcanized oil seals, and package and store them after passing the test.

[0009] Preferably, in step S3, the vulcanization molding includes the following steps: S31, presetting the parameters of the vulcanization temperature, pressure and time of the plate vulcanizing agent; S32, weighing the mixed rubber material according to the required oil seal shape and size, and placing it into a pre-designed mold; S33, start vulcanization, and perform temperature control, pressure control and time control; S34, when the vulcanization time reaches the set value, the vulcanization process is stopped.

[0010] Preferably, in step S4, the cooling is performed at room temperature, and the finishing includes flash cleaning, dimensional accuracy adjustment, and appearance inspection and modification.

[0011] Preferably, in step S5, the post-processing of the vulcanized oil seal is used to trim and polish the edges of the oil seal, remove excess materials and burrs, and perform quality inspection.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention uses hydrogenated nitrile rubber, silicone and aramid fiber, so that the present invention has good corrosion resistance, heat resistance and excellent mechanical properties. It can effectively resist the erosion of external chemicals in the equipment application of lithium battery diaphragm processing, prevent the aging and failure of the oil seal, and ensure the robustness of the sealing performance. The good chemical resistance can prevent the leakage of chemicals inside and outside the unit, keep the internal environment of the equipment clean, and ensure the smooth progress of the processing process.

[0013] 2. The oil seal of the present invention has excellent wear resistance and can reduce wear, thereby extending the service life of the oil seal, indirectly reducing equipment maintenance costs while improving production efficiency. The manufacture of lithium batteries and their diaphragm processing are often carried out in a high temperature environment, so the oil seal needs to have excellent high-temperature stability. Materials such as hydrogenated nitrile rubber will not lose elasticity at high temperatures and can continue to maintain their sealing properties.

[0014] 3. The oil seal of the present invention has an excellent heat-resistant tensile strength retention rate and can still maintain a high strength under high temperature conditions, thereby effectively resisting internal pressure and friction and preventing seal failure. In the high-temperature lithium battery diaphragm processing environment, a high heat-resistant tensile strength retention rate means that the oil seal can maintain its structural integrity at high temperatures, avoiding problems such as deformation and tearing of the sealing lip due to reduced material strength, thereby ensuring the sealing and reliability of the equipment under high temperature conditions. DETAILED DESCRIPTION

[0015] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0016] The present invention will be further described below in conjunction with the embodiments. Embodiment 1

[0017] The present embodiment provides an integrally formed oil seal, comprising the following raw materials in parts by weight: 60 parts by weight of hydrogenated nitrile rubber, 5 parts by weight of lignin, 8 parts by weight of wollastonite, 5 parts by weight of aramid fiber, 1 part by weight of siloxane, 10 parts by weight of carbon black, 1 part by weight of a vulcanizing agent, and 1 part by weight of an auxiliary agent.

[0018] Among them, sulfur is selected as the vulcanizing agent, and the auxiliary agents include antioxidants, anti-ultraviolet agents and lubricants.

[0019] A preparation process of an integrally formed oil seal comprises the following steps: Ⅰ. Accurately weigh hydrogenated nitrile rubber and add it into an internal mixer for plasticization. Then add lignin, wollastonite, aramid fiber, siloxane, carbon black, vulcanizing agent and additives in sequence for mixing. Continue stirring and mixing at 60-80°C for 20-30 minutes. Ⅱ. Filter the mixed rubber to remove impurities and bubbles; III. Inject the mixed rubber raw materials into the oil seal mold to ensure that the material completely fills the mold cavity, and then vulcanize and mold. The vulcanization temperature is 160-180℃, the pressure is 10-20MPa, and the vulcanization time is 5-10min; Specifically, vulcanization molding includes the following steps: 31) Pre-set the vulcanization temperature, pressure and time parameters of the plate vulcanizer; 32) Weigh the mixed rubber according to the required oil seal shape and size and put it into the pre-designed mold; 33) Start vulcanization and perform temperature control, pressure control and time control; 34) When the vulcanization time reaches the set value, stop the vulcanization process; IV. After vulcanization is completed, the oil seal is removed from the mold for cooling and trimming; The cooling is carried out at room temperature, and the finishing includes flash cleaning, dimensional accuracy adjustment, and appearance inspection and modification; Ⅴ. Carry out post-processing on the vulcanized oil seals, and package and store the oil seals after they pass the test; Among them, the post-processing of the vulcanized oil seal is used to trim and polish the edges of the oil seal, remove excess materials and burrs, and perform quality inspection. Embodiment 2

[0020] The present embodiment provides an integrally formed oil seal, comprising the following raw materials in parts by weight: 70 parts by weight of hydrogenated nitrile rubber, 10 parts by weight of lignin, 13 parts by weight of wollastonite, 7 parts by weight of aramid fiber, 3 parts by weight of siloxane, 20 parts by weight of carbon black, 3 parts by weight of vulcanizing agent and 2 parts by weight of auxiliary agent.

[0021] Among them, sulfur is selected as the vulcanizing agent, and the auxiliary agents include antioxidants, anti-ultraviolet agents and lubricants.

[0022] A preparation process of an integrally formed oil seal comprises the following steps: Ⅰ. Accurately weigh hydrogenated nitrile rubber and add it into an internal mixer for plasticization. Then add lignin, wollastonite, aramid fiber, siloxane, carbon black, vulcanizing agent and additives in sequence for mixing. Continue stirring and mixing at 60-80°C for 20-30 minutes. Ⅱ. Filter the mixed rubber to remove impurities and bubbles; III. Inject the mixed rubber raw materials into the oil seal mold to ensure that the material completely fills the mold cavity, and then vulcanize and mold. The vulcanization temperature is 160-180℃, the pressure is 10-20MPa, and the vulcanization time is 5-10min; Specifically, vulcanization molding includes the following steps: 31) Pre-set the vulcanization temperature, pressure and time parameters of the plate vulcanizer; 32) Weigh the mixed rubber according to the required oil seal shape and size and put it into the pre-designed mold; 33) Start vulcanization and perform temperature control, pressure control and time control; 34) When the vulcanization time reaches the set value, stop the vulcanization process; IV. After vulcanization is completed, the oil seal is removed from the mold for cooling and trimming; The cooling is carried out at room temperature, and the finishing includes flash cleaning, dimensional accuracy adjustment, and appearance inspection and modification; Ⅴ. Carry out post-processing on the vulcanized oil seals, and package and store the oil seals after they pass the test; Among them, the post-processing of the vulcanized oil seal is used to trim and polish the edges of the oil seal, remove excess materials and burrs, and perform quality inspection. Embodiment 3

[0023] The present embodiment provides an integrally formed oil seal, comprising the following raw materials in parts by weight: 75 parts by weight of hydrogenated nitrile rubber, 12 parts by weight of lignin, 16 parts by weight of wollastonite, 8 parts by weight of aramid fiber, 3 parts by weight of siloxane, 30 parts by weight of carbon black, 3 parts by weight of vulcanizing agent and 2 parts by weight of auxiliary agent.

[0024] Among them, sulfur is selected as the vulcanizing agent, and the auxiliary agents include antioxidants, anti-ultraviolet agents and lubricants.

[0025] A preparation process of an integrally formed oil seal comprises the following steps: Ⅰ. Accurately weigh hydrogenated nitrile rubber and add it into an internal mixer for plasticization. Then add lignin, wollastonite, aramid fiber, siloxane, carbon black, vulcanizing agent and additives in sequence for mixing. Continue stirring and mixing at 60-80°C for 20-30 minutes. Ⅱ. Filter the mixed rubber to remove impurities and bubbles; III. Inject the mixed rubber raw materials into the oil seal mold to ensure that the material completely fills the mold cavity, and then vulcanize and mold. The vulcanization temperature is 160-180℃, the pressure is 10-20MPa, and the vulcanization time is 5-10min; Specifically, vulcanization molding includes the following steps: 31) Pre-set the vulcanization temperature, pressure and time parameters of the plate vulcanizer; 32) Weigh the mixed rubber according to the required oil seal shape and size and put it into the pre-designed mold; 33) Start vulcanization and perform temperature control, pressure control and time control; 34) When the vulcanization time reaches the set value, stop the vulcanization process; IV. After vulcanization is completed, the oil seal is removed from the mold for cooling and trimming; The cooling is carried out at room temperature, and the finishing includes flash cleaning, dimensional accuracy adjustment, and appearance inspection and modification; Ⅴ. Carry out post-processing on the vulcanized oil seals, and package and store the oil seals after they pass the test; Among them, the post-processing of the vulcanized oil seal is used to trim and polish the edges of the oil seal, remove excess materials and burrs, and perform quality inspection. Embodiment 4

[0026] The present embodiment provides an integrally formed oil seal, comprising the following raw materials in parts by weight: 80 parts by weight of hydrogenated nitrile rubber, 15 parts by weight of lignin, 20 parts by weight of wollastonite, 10 parts by weight of aramid fiber, 5 parts by weight of siloxane, 40 parts by weight of carbon black, 5 parts by weight of a vulcanizing agent, and 3 parts by weight of an auxiliary agent.

[0027] Among them, sulfur is selected as the vulcanizing agent, and the auxiliary agents include antioxidants, anti-ultraviolet agents and lubricants.

[0028] A preparation process of an integrally formed oil seal comprises the following steps: Ⅰ. Accurately weigh hydrogenated nitrile rubber and add it into an internal mixer for plasticization. Then add lignin, wollastonite, aramid fiber, siloxane, carbon black, vulcanizing agent and additives in sequence for mixing. Continue stirring and mixing at 60-80°C for 20-30 minutes. Ⅱ. Filter the mixed rubber to remove impurities and bubbles; III. Inject the mixed rubber raw materials into the oil seal mold to ensure that the material completely fills the mold cavity, and then vulcanize and mold. The vulcanization temperature is 160-180℃, the pressure is 10-20MPa, and the vulcanization time is 5-10min; Specifically, vulcanization molding includes the following steps: 31) Pre-set the vulcanization temperature, pressure and time parameters of the plate vulcanizer; 32) Weigh the mixed rubber according to the required oil seal shape and size and put it into the pre-designed mold; 33) Start vulcanization and perform temperature control, pressure control and time control; 34) When the vulcanization time reaches the set value, stop the vulcanization process; IV. After vulcanization is completed, the oil seal is removed from the mold for cooling and trimming; The cooling is carried out at room temperature, and the finishing includes flash cleaning, dimensional accuracy adjustment, and appearance inspection and modification; Ⅴ. Carry out post-processing on the vulcanized oil seals, and package and store the oil seals after they pass the test; Among them, the post-processing of the vulcanized oil seal is used to trim and polish the edges of the oil seal, remove excess materials and burrs, and perform quality inspection.

[0029] Comparative Example 1

[0030] The one-piece oil seal and its preparation process provided in this embodiment are substantially the same as those in Embodiment 1, with the main difference being that wollastonite is not added to the raw materials.

[0031] Comparative Example 2

[0032] The one-piece oil seal and its preparation process provided in this embodiment are substantially the same as those in Embodiment 1, with the main difference being that siloxane is not added to the raw materials.

[0033] Comparative Example 3

[0034] The one-piece molded oil seal and its preparation process provided in this embodiment are substantially the same as those in Embodiment 1, with the main difference being that the hydrogenated nitrile rubber in the raw material is replaced by fluororubber.

[0035] The oil seals prepared in Examples 1-4 and Comparative Examples 1-3 were subjected to performance tests, including mechanical property tests, vulcanization property tests, friction and wear property tests, chemical resistance tests, and high temperature resistance tests, according to the testing standards: GB / T528-2009, GB / T531.1-2008, GB / T9896-2014, GB / T3960-2016, HG / T2869-2011, and GB / T3512-2014, and the relevant data are recorded in Table 1; Table 1: Test data record table

[0036] Group Corrosion resistance tensile strength change rate (%) Elongation at break (%) Shore A hardness Tensile strength retention rate (%) Example 1 1.2 180 75 95 Example 2 1.5 168 73 92 Example 3 2.3 172 72 86 Example 4 1.8 154 71 82 Comparative Example 1 6.2 120 63 57 Comparative Example 2 7.4 115 61 62 Comparative Example 3 6.7 121 60 68 It can be seen from Table 1 that, compared with the comparative example, the oil seals prepared in Examples 1-4 have excellent performance in chemical resistance, wear resistance and temperature stability. The low corrosion resistance tensile strength change rate can ensure that the oil seal can still maintain structural integrity in a complex chemical environment, avoid cracks or damage, thereby ensuring its sealing function. The good elongation at break can ensure that the oil seal can withstand these external forces without being torn, thereby maintaining its sealing function. The oil seal has good hardness and can have certain elasticity and wear resistance while ensuring good sealing performance. The oil seal can still maintain a high strength under high temperature conditions, thereby effectively resisting internal pressure and friction and preventing seal failure.

[0037] The invention effectively resists the erosion of external chemicals in the application of equipment for lithium battery diaphragm processing, prevents aging and failure of oil seals, ensures robust sealing performance, and good chemical resistance can prevent leakage of chemicals inside and outside the unit, keep the internal environment of the equipment clean, and ensure the smooth progress of the processing process. During material transmission and equipment operation, the oil seal parts are constantly rubbing against other moving parts. Excellent wear resistance can reduce wear, thereby extending the service life of the oil seal, indirectly reducing equipment maintenance costs while improving production efficiency. The manufacture of lithium batteries and their diaphragm processing are often carried out in a high temperature environment, so the oil seal needs to have excellent high-temperature stability. Materials such as hydrogenated nitrile rubber will not lose elasticity at high temperatures and can continue to maintain their sealing properties.

[0038] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An integrally formed oil seal, characterized in that: The invention comprises the following raw materials in parts by weight: 60 to 80 parts by weight of hydrogenated nitrile rubber, 5 to 15 parts by weight of lignin, 8 to 20 parts by weight of wollastonite, 5 to 10 parts by weight of aramid fiber, 1 to 5 parts by weight of siloxane, 10 to 40 parts by weight of carbon black, 1 to 5 parts by weight of vulcanizing agent and 1 to 3 parts by weight of auxiliary agent.

2. The integrally formed oil seal according to claim 1, characterized in that: The vulcanizing agent is selected from one of sulfur and peroxide.

3. The integrally formed oil seal according to claim 1, characterized in that: The auxiliary agents include antioxidants, anti-ultraviolet agents and lubricants.

4. A process for preparing an integrally formed oil seal, characterized in that: Using the integrally formed oil seal according to any one of claims 1 to 3 comprises the following steps: S1. Accurately weigh hydrogenated nitrile rubber and add it into an internal mixer for plasticization. Then, add lignin, wollastonite, aramid fiber, siloxane, carbon black, vulcanizing agent and additives in sequence for mixing. Stir and mix continuously at 60-80° C. for 20-30 minutes. S2, filtering the mixed rubber material to remove impurities and bubbles; S3. Inject the mixed rubber raw materials into the oil seal mold to ensure that the material completely fills the mold cavity, and perform vulcanization molding. The vulcanization temperature is 160-180℃, the pressure is 10-20MPa, and the vulcanization time is 5-10min; S4. After vulcanization is completed, the oil seal is taken out of the mold for cooling and trimming; S5. Post-process the vulcanized oil seals, and package and store them after passing the test.

5. The process for preparing an integrally formed oil seal according to claim 4, characterized in that: In step S3, the vulcanization molding includes the following steps: S31, presetting the parameters of the vulcanization temperature, pressure and time of the plate vulcanizing agent; S32, weighing the mixed rubber material according to the required oil seal shape and size, and placing it into a pre-designed mold; S33, start vulcanization, and perform temperature control, pressure control and time control; S34, when the vulcanization time reaches the set value, the vulcanization process is stopped.

6. The process for preparing an integrally formed oil seal according to claim 4, characterized in that: In step S4, the cooling is performed at room temperature, and the finishing includes flash cleaning, dimensional accuracy adjustment, and appearance inspection and modification.

7. The process for preparing an integrally formed oil seal according to claim 4, characterized in that: In step S5, the post-processing of the vulcanized oil seal is used to trim and polish the edges of the oil seal, remove excess materials and burrs, and perform quality inspection.