A highly wear-resistant oil seal material and its preparation method

Abstract

The present invention relates to the technical field of oil seal materials, and provides a highly wear-resistant oil seal material and a preparation method thereof. A highly wear-resistant oil seal material comprises the following components in parts by weight: 120 parts of acrylate rubber, 15-25 parts of polyurethane, 8-16 parts of polyphthalamide, 16-35 parts of wear-resistant material, 10-15 parts of carbon black, 1-2 parts of vulcanization accelerator, and 2-4 parts of vulcanizing agent; the wear-resistant material comprises aluminum borate whiskers and acetylacetone metal complex in a weight ratio of 1-9:1. Through the above technical solution, the problem of poor wear resistance of oil seal materials in the related art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil seal materials, and specifically, to a highly wear-resistant oil seal material and a preparation method thereof. Background Art

[0002] An oil seal is usually a sealing element used in mechanical equipment, such as key parts like steering gears and bearings, to prevent the leakage of working media (such as lubricating oil, fuel, etc.) and to prevent the intrusion of external dust, impurities, etc. Parts such as steering gears and bearings are key parts for the safe driving of automobiles. During operation, wear will occur. When the oil seal material in the parts is damaged, it is easy to cause safety problems, which not only affect the safe driving of the vehicle but also threaten the life and property safety of the users. Therefore, the wear resistance of the oil seal material is a key issue to be focused on during the manufacturing and use of the oil seal material.

[0003] Oil seal materials mainly include rubber-based, plastic-based, and composite-based materials. Traditional oil seal materials often use rubber materials, mainly including nitrile rubber, hydrogenated nitrile rubber, fluororubber, etc. Among them, the cost of nitrile rubber material is relatively low, but its sealing performance is limited. The sealing performance of fluororubber is relatively good, but its wear resistance is poor and its service life is relatively short. Currently, to improve the wear resistance of the oil seal material, while selecting a base material with good wear resistance, inorganic fillers such as SiO2 are usually introduced to assist in improving the overall wear resistance and other properties of the oil seal material. However, inorganic fillers usually have problems such as poor interfacial bonding force with other components and uneven dispersion, which have certain limitations on the improvement of the wear resistance of the oil seal material.

[0004] Therefore, it is necessary to develop an oil seal material with good wear resistance, which is of great significance for meeting the oil seal requirements of various parts and extending the service life of the oil seal material. Summary of the Invention

[0005] The present invention provides a highly wear-resistant oil seal material and a preparation method thereof, which solve the problem of poor wear resistance of the oil seal material in the related art.

[0006] The technical solution of the present invention is as follows:

[0007] The present invention provides a highly wear-resistant oil seal material, comprising the following components in parts by weight:

[0008] 120 parts of acrylate rubber, 15 - 25 parts of polyurethane, 8 - 16 parts of polyphthalamide, 16 - 35 parts of wear-resistant material, 10 - 15 parts of reinforcing agent, 1 - 2 parts of vulcanization accelerator, and 2 - 4 parts of vulcanizing agent;

[0009] The wear-resistant material comprises aluminum borate whiskers and metal acetylacetonate complexes in a weight ratio of 1 - 9:1.

[0010] As a further technical solution, the weight ratio of the aluminum borate whiskers to the metal acetylacetonate complex is 2 to 6:1.

[0011] When the weight ratio of the aluminum borate whiskers to the metal acetylacetonate complex is 2 to 6:1, the wear resistance of the oil seal material can be further improved.

[0012] As a further technical solution, the aluminum borate whiskers are aluminum borate whisker composites, and the raw materials of the aluminum borate whisker composites are 4,4'-oxybisphthalic anhydride and aluminum borate whiskers.

[0013] In the present invention, the aluminum borate whiskers are compounded with 4,4'-oxybisphthalic anhydride, which can improve the bonding force and compatibility between the aluminum borate whiskers and the acrylate rubber base material. When the oil seal material is subjected to an external force, the aluminum borate whiskers are not easily pulled out in the matrix, so that the oil seal material is more uniform and dense, thereby improving the tensile strength of the oil seal material.

[0014] As a further technical solution, the weight ratio of the aluminum borate whiskers to the 4,4'-oxybisphthalic anhydride is 20:2 to 3.

[0015] When the weight ratio of the aluminum borate whiskers to the 4,4'-oxybisphthalic anhydride is 20:2 to 3, the tensile strength of the oil seal material can be further improved.

[0016] As a further technical solution, the metal acetylacetonate complex is one or both of aluminum acetylacetonate and titanium acetylacetonate.

[0017] As a further technical solution, the length of the aluminum borate whiskers is 15 to 60 μm, and the diameter is 0.3 to 2.0 μm.

[0018] As a further technical solution, the vulcanization accelerator is one or more of accelerator TMTD, accelerator CBS, and accelerator TETD;

[0019] The vulcanizing agent is one or more of sulfur, benzoyl peroxide, and dicumyl peroxide;

[0020] The reinforcing agent is one or both of carbon black and silica.

[0021] As a further technical solution, it further includes at least one of the following features: antioxidant, lubricant.

[0022] In the present invention, when the high wear-resistant oil seal material further includes an antioxidant, the addition amount of the antioxidant can be 1 to 3 parts by weight. The addition of the antioxidant can ensure the antioxidant ability of the oil seal material to ensure the stability of the oil seal material. The antioxidant can be antioxidant 1010, antioxidant 1076, antioxidant 168, or antioxidant 264.

[0023] In the present invention, when the high wear-resistant oil seal material further includes a lubricant, based on parts by weight, the addition amount of the lubricant can be 1 to 3 parts. The lubricant can form a lubricating film on the contact surface between the oil seal and the shaft. While reducing the frictional energy loss, it can also keep the oil seal in a good sealing state. The lubricant can be molybdenum disulfide or graphite.

[0024] The present invention also provides a preparation method of the above-mentioned high wear-resistant oil seal material, which includes the following steps:

[0025] S1. Mix the aluminum borate whiskers and the metal acetylacetonate complex, and grind them to obtain a wear-resistant material;

[0026] S2. Plasticate the acrylate rubber, then add the remaining components except the vulcanizing agent for mixing, add the vulcanizing agent and continue mixing, and then vulcanize to obtain the oil seal material.

[0027] As a further technical solution, in step S2, after the mixing, it further includes passing through thin sheets and taking off the sheets to obtain a rubber sheet.

[0028] As a further technical solution, in step S1, when mixing, first mix at a stirring speed of 100 to 300 r / min for 1 to 1.5 h, and then mix at a stirring speed of 700 to 900 r / min for 0.5 to 1 h.

[0029] As a further technical solution, in step S1, when grinding, the grinding speed is 200 to 400 r / min, and the grinding time is 40 to 60 min.

[0030] As a further technical solution, during the vulcanization, it is divided into primary vulcanization and secondary vulcanization. During the primary vulcanization, the vulcanization temperature is 163 to 168 °C, and the time is 15 to 25 min; during the secondary vulcanization, the vulcanization temperature is 170 to 175 °C, and the time is 45 to 65 min.

[0031] As a further technical solution, the preparation method of the aluminum borate whisker complex includes the following steps: Add the aluminum borate whiskers into water, adjust the pH to 8.5 to 9.5, stir for the first time, and separate to obtain pretreated aluminum borate whiskers. Disperse the pretreated aluminum borate whiskers and the 4,4'-oxybisphthalic anhydride in ethanol, stir for the second time, separate, and dry to obtain the aluminum borate whisker complex.

[0032] As a further technical solution, when adjusting the pH to 8.5 to 9.5, sodium hydroxide solution or potassium hydroxide solution is used.

[0033] As a further technical solution, during the first stirring, the stirring temperature is 60-70°C and the stirring time is 0.5-1.5 h; during the second stirring, the stirring temperature is 30-38°C and the stirring time is 2.5-3.5 h.

[0034] The working principle and beneficial effects of the present invention are as follows:

[0035] 1. In the present invention, the oil seal material uses acrylate rubber as the base material. The acrylate rubber base material can endow the oil seal material with basic heat-resistant oil performance, enabling the oil seal material to maintain basic stability when contacting lubricating oil and fuel oil with relatively high temperatures, and making it not prone to problems such as deformation. By combining polyurethane, polyphthalamide, composite wear-resistant material, carbon black, vulcanization accelerator, and vulcanizing agent raw materials, through the reasonable proportioning and synergistic effect of each component, while ensuring the sealing performance of the oil seal material, the wear-resistant performance of the oil seal material can also be improved, thereby extending the service life of the oil seal material.

[0036] 2. The composite wear-resistant material includes aluminum borate whiskers and acetylacetone metal complexes. The acetylacetone metal complexes can make the rubber base material interact more closely with other components, and at the same time can also improve the interfacial bonding force between the aluminum borate whiskers and the base material. By using the aluminum borate whiskers and acetylacetone metal complexes together, it can play a supporting role for the oil seal material, disperse the friction stress of the oil seal material to a certain extent, and reduce the wear of the oil seal material. Specific Embodiments

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the scope of the present invention.

[0038] In the following embodiments and comparative examples, the acrylate rubber has the model AR-140; the polyurethane has the model TPUS98A; the polyphthalamide has the model GVS-5H; the average length of the aluminum borate whiskers is 20 μm and the diameter is 1.0 μm.

[0039] Example 1

[0040] A highly wear-resistant oil seal material, comprising the following components in parts by weight:

[0041] 120 parts of acrylate rubber, 15 parts of polyurethane, 8 parts of polyphthalamide, 2 parts of molybdenum disulfide, 2 parts of antioxidant 1010, 16 parts of wear-resistant material, 10 parts of carbon black, 1 part of accelerator TMTD, 2 parts of dicumyl peroxide;

[0042] The composite wear-resistant material comprises 8 parts of aluminum borate whiskers and 8 parts of titanium acetylacetonate;

[0043] A preparation method of a highly wear-resistant oil seal material comprises the following steps:

[0044] S1. After mixing aluminum borate whiskers and titanium acetylacetonate at a stirring speed of 100 r / min for 1.5 h, then mixing at a stirring speed of 700 r / min for 1 h, and grinding at 200 r / min for 60 min, a wear-resistant material is obtained;

[0045] S2. After plasticizing the acrylate rubber, adding the remaining components except dicumyl peroxide for mixing, adding dicumyl peroxide and continuing to mix, passing through the mill 5 times, and taking off the sheet to obtain a rubber sheet;

[0046] S3. After storing the rubber sheet for 24 h, vulcanizing at 163 °C for 25 min and then vulcanizing at 170 °C for 65 min to obtain the oil seal material.

[0047] Example 2

[0048] A highly wear-resistant oil seal material comprises the following components in parts by weight:

[0049] 120 parts of acrylate rubber, 20 parts of polyurethane, 12 parts of polyphthalamide, 21 parts of wear-resistant material, 12 parts of white carbon black, 1.5 parts of accelerator CBS, 3 parts of benzoyl peroxide;

[0050] The composite wear-resistant material comprises 12 parts of aluminum borate whiskers and 9 parts of aluminum acetylacetonate;

[0051] A preparation method of a highly wear-resistant oil seal material comprises the following steps:

[0052] S1. After mixing aluminum borate whiskers and aluminum acetylacetonate at a stirring speed of 200 r / min for 1 h, then mixing at a stirring speed of 800 r / min for 0.5 h, and grinding at 300 r / min for 50 min, a wear-resistant material is obtained;

[0053] S2. After plasticizing the acrylate rubber, adding the remaining components except benzoyl peroxide for mixing, adding benzoyl peroxide and continuing to mix, passing through the mill 5 times, and taking off the sheet to obtain a rubber sheet;

[0054] S3. After storing the rubber sheet for 24 h, vulcanizing at 166 °C for 20 min and then vulcanizing at 175 °C for 55 min to obtain the oil seal material.

[0055] Example 3

[0056] A highly wear-resistant oil seal material comprises the following components in parts by weight:

[0057] 120 parts of acrylate rubber, 25 parts of polyurethane, 16 parts of polyphthalamide, 2 parts of molybdenum disulfide, 35 parts of wear-resistant material, 15 parts of carbon black, 2 parts of accelerator TETD, 4 parts of sulfur;

[0058] The composite wear-resistant material comprises 31.5 parts of aluminum borate whiskers and 3.5 parts of aluminum acetylacetonate;

[0059] A preparation method of a high wear-resistant oil seal material, comprising the following steps:

[0060] S1. Mix aluminum borate whiskers and aluminum acetylacetonate at a stirring speed of 300 r / min for 1 h, then mix at a stirring speed of 900 r / min for 0.5 h, and grind at 400 r / min for 40 min to obtain a wear-resistant material;

[0061] S2. Plasticate the acrylate rubber, then add the remaining components except sulfur for mixing, add sulfur and continue mixing, pass through the mill 5 times, and take off the sheet to obtain a rubber sheet;

[0062] S3. After the rubber sheet is parked for 24 h, vulcanize it at 168 °C for 15 min and then at 175 °C for 45 min to obtain the oil seal material.

[0063] Example 4

[0064] The difference between this example and Example 2 is only that in this example, the wear-resistant material comprises 20 parts of aluminum borate whiskers and 1 part of aluminum acetylacetonate.

[0065] Example 5

[0066] The difference between this example and Example 2 is only that in this example, the wear-resistant material comprises 14 parts of aluminum borate whiskers and 7 parts of aluminum acetylacetonate.

[0067] Example 6

[0068] The difference between this example and Example 2 is only that in this example, the wear-resistant material comprises 18 parts of aluminum borate whiskers and 3 parts of aluminum acetylacetonate.

[0069] Example 7

[0070] The difference between this example and Example 6 is only that in this example, the aluminum borate whiskers are aluminum borate whisker composites;

[0071] A preparation method of a high wear-resistant oil seal material, comprising the following steps:

[0072] S0. Add 20 parts of aluminum borate whiskers to 100 parts of water, adjust the pH to 9 with a 10% sodium hydroxide solution by weight, stir at 65 °C for 1 h, separate to obtain pretreated aluminum borate whiskers. Disperse the pretreated aluminum borate whiskers and 1 part of 4,4'-oxybisphthalic anhydride in 100 parts of ethanol, stir at 35 °C for 3 h, separate and dry to obtain aluminum borate whisker composites;

[0073] S1. Mix 18 parts of the above-mentioned aluminum borate whisker composites and 3 parts of aluminum acetylacetonate at a stirring speed of 200 r / min for 1 h, then mix at a stirring speed of 800 r / min for 0.5 h, and grind at 300 r / min for 50 min to obtain wear-resistant materials;

[0074] S2. Plasticate acrylate rubber, add the remaining components except benzoyl peroxide for mixing, add benzoyl peroxide and continue mixing, pass through the mill 5 times, and take off the sheet to obtain a rubber sheet;

[0075] S3. After parking the rubber sheet for 24 h, vulcanize at 166 °C for 20 min and then vulcanize at 175 °C for 55 min to obtain oil seal materials.

[0076] Example 8

[0077] The difference between this example and Example 7 is only that in the preparation process of the aluminum borate whisker composites in this example, 4 parts of 4,4'-oxybisphthalic anhydride are added.

[0078] Example 9

[0079] The difference between this example and Example 7 is only that in the preparation process of the aluminum borate whisker composites in this example, 2 parts of 4,4'-oxybisphthalic anhydride are added.

[0080] Example 10

[0081] The difference between this example and Example 7 is only that in the preparation process of the aluminum borate whisker composites in this example, 3 parts of 4,4'-oxybisphthalic anhydride are added.

[0082] Comparative Example 1

[0083] The difference between this comparative example and Example 1 is only that in this comparative example, titanium acetylacetonate is not added, and 16 parts of aluminum borate whiskers are added.

[0084] Comparative Example 2

[0085] The difference between this comparative example and Example 1 is only that in this comparative example, the aluminum borate whiskers are replaced with an equal amount of acicular wollastonite.

[0086] Comparative Example 3

[0087] The difference between this comparative example and Example 1 is only that in this comparative example, no wear-resistant material was added.

[0088] Comparative Example 4

[0089] The difference between this comparative example and Example 1 is only that in this comparative example, aluminum borate whiskers were not added, and 16 parts of titanium acetylacetonate were added.

[0090] Experimental Example Wear Resistance Test

[0091] The oil seal materials prepared in Examples 1 to 6 and Comparative Examples 1 to 4 were subjected to volume wear test according to the method specified in GB / T 9867-2008 "Determination of abrasion resistance of vulcanized rubber or thermoplastic rubber (rotating roller abrasion testing machine method)", and the test results were the average values of 3 specimens;

[0092] The test results are shown in Table 1 below:

[0093] Table 1 Wear Resistance Test Results of Examples 1 to 6 and Comparative Examples 1 to 4

[0094]

[0095] As can be seen from Table 1, the volume wear of the oil seal material prepared by this solution < 0.320 cm 3 , indicating that the oil seal material prepared by this solution has good wear resistance. Among them, compared with Comparative Examples 1 to 4, the volume wear of Examples 1 to 3 was significantly reduced, indicating that the wear resistance of the oil seal material can be improved by the compounding of aluminum borate whiskers and metal acetylacetonate complexes. In addition, compared with Examples 2 and 4, the volume wear of Examples 5 to 6 was significantly reduced, indicating that when the weight ratio of aluminum borate whiskers to metal acetylacetonate complexes is 2 to 6:1, the wear resistance of the oil seal material can be further improved.

[0096] Experimental Example 2 Tensile Strength Test

[0097] The oil seal materials prepared in Examples 6 to 10 were subjected to tensile strength test according to GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber". Among them, the specimen type was type 1, the moving speed was 500 mm / min, and the test results were the average values of 3 specimens;

[0098] The test results are shown in Table 2 below:

[0099] Table 2 Tensile Strength Test Results of Examples 6 to 10

[0100]

[0101] Compared with Example 6, the tensile strength of the oil seal materials prepared in Examples 7 to 10 is increased, indicating that the use of 4,4'-oxybisphthalic anhydride to compound aluminum borate whiskers can improve the tensile strength of the oil seal materials. Among them, compared with Examples 7 to 8, the tensile strength of the oil seal materials prepared in Examples 9 to 10 is increased, indicating that when the weight ratio of aluminum borate whiskers to 4,4'-oxybisphthalic anhydride is 20:2 to 3, the tensile strength of the oil seal materials can be further improved.

[0102] Experimental Example 3

[0103] The following performance tests were respectively carried out on the oil seal materials prepared in Example 1:

[0104] ① Hardness: The hardness test was carried out according to the method in GB / T 531.1-2008 "Vulcanized Rubber or Thermoplastic Rubber - Determination of Indentation Hardness - Part 1: Shore Hardness".

[0105] ② Aging resistance test: The specimen was placed in a high-temperature oven at 150°C for 84 h for heat aging experiment. After taking it out and cooling, the tensile strength test after heat aging was carried out according to GB / T 528-2009 "Vulcanized Rubber or Thermoplastic Rubber - Determination of Tensile Stress-Strain Properties". Among them, the specimen type was type 1, the moving speed was 500 mm / min, and the test result was the average value of 3 specimens.

[0106] The test results are shown in Table 3:

[0107] Table 3 Performance Test Results of Example 1

[0108]

[0109] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A highly wear-resistant oil seal material, characterized in that: The composition comprises the following components in parts by weight: 120 parts of acrylic rubber, 15-25 parts of polyurethane, 8-16 parts of polyphthalamide, 16-35 parts of wear-resistant material, 10-15 parts of reinforcing agent, 1-2 parts of vulcanization accelerator, 2-4 parts of vulcanizing agent; The wear-resistant material comprises aluminum borate whiskers and acetylacetone metal complex in a weight ratio of 1 to 9:1; The aluminum borate whisker is an aluminum borate whisker composite, and the raw materials of the aluminum borate whisker composite are 4,4'-oxydiphthalic anhydride and aluminum borate whisker.

2. A highly wear-resistant oil seal material according to claim 1, characterized in that: The weight ratio of the aluminum borate whisker to the acetylacetone metal complex is 2-6:

1.

3. A highly wear-resistant oil seal material according to claim 1, characterized in that: The weight ratio of the aluminum borate whisker to the 4,4'-oxydiphthalic anhydride is 20:2-3.

4. A highly wear-resistant oil seal material according to claim 1, characterized in that: The acetylacetonate metal complex is one or both of acetylacetonate aluminum and acetylacetonate titanium.

5. A highly wear-resistant oil seal material according to claim 1, characterized in that: The vulcanization accelerator is one or more of accelerator TMTD, accelerator CBS, and accelerator TETD; The vulcanizing agent is one or more of sulfur, benzoyl peroxide, and dicumyl peroxide; The reinforcing agent is one or both of carbon black and white carbon black.

6. A highly wear-resistant oil seal material according to claim 1, characterized in that: It also includes at least one of the following features: antioxidant, lubricant.

7. The method for preparing a highly wear-resistant oil seal material according to claim 1, characterized in that: The following steps are involved: S1, mixing the aluminum borate whiskers and the acetylacetone metal complex, grinding, and obtaining a wear-resistant material; S2, after the acrylic rubber is plasticized, the remaining components except the vulcanizing agent are added and kneaded, the vulcanizing agent is added and the kneading is continued, and the vulcanization is performed to obtain the oil seal material.

8. The method for preparing a highly wear-resistant oil seal material according to claim 7, characterized in that: In step S1, during the mixing, the mixture is first mixed at a stirring speed of 100 to 300 r / min for 1 to 1.5 h, and then mixed at a stirring speed of 700 to 900 r / min for 0.5 to 1 h.

9. The method for preparing a highly wear-resistant oil seal material according to claim 7, characterized in that: The vulcanization is divided into primary vulcanization and secondary vulcanization. During the primary vulcanization, the vulcanization temperature is 163-168° C. and the time is 15-25 minutes; during the secondary vulcanization, the vulcanization temperature is 170-175° C. and the time is 45-65 minutes.

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