Wear-resistant special rubber for continuous high-rotating-speed motor transmission oil seal and preparation method of wear-resistant special rubber

Abstract

The invention relates to a wear-resistant special rubber for a continuous high-rotating-speed motor transmission oil seal and a preparation method thereof. The wear-resistant special rubber is prepared from the following materials in parts by mass: 100 parts of fluororubber; 15 to 30 parts of diatomite; 15 to 30 parts of calcium silicate; 5-10 parts of iron oxide red; 2-6 parts of carbon black; 1-5 parts of magnesium oxide; 5 to 10 parts of calcium hydroxide; 1-2 parts of a vulcanizing agent; 5-10 parts of molybdenum disulfide; the wear-resistant special rubber has good comprehensive physical properties, meets the oil resistance requirement of the oil seal, reduces the friction loss of the oil seal in the use process, ensures the sealing performance of the product at a high rotating speed, prolongs the service life of the oil seal, and solves the problem of poor wear resistance of the motor transmission oil seal at the high rotating speed.

Description

Technical Field

[0001] The invention relates to the technical field of rubber materials, and in particular to a wear-resistant special rubber for a continuous high-speed motor transmission oil seal and a preparation method thereof. Background Art

[0002] At present, high-speed motor transmissions have become a development trend in the automotive industry. High speed means greater mechanical stress and friction heat, which puts higher requirements on the performance of oil seals. In this case, traditional ordinary oil seals may not meet the needs because they may cause overheating, wear and leakage due to high-speed friction. Therefore, in order to ensure the normal operation and long life of high-speed rotating motors, it is particularly important to develop high-speed wear-resistant oil seals.

[0003] At present, oil seal materials mostly use ordinary nitrile rubber and acrylic rubber, but the working temperature of nitrile rubber is low, the oil resistance of acrylic rubber is poor, and it is easy to leak oil under high-speed operation and has poor wear resistance. Therefore, high-quality fluororubber oil seals and hydrogenated nitrile rubber have begun to be used in large quantities.

[0004] At present, one of the main research directions of wear resistance and friction reduction of rubber materials is to develop from single materials to composite materials, adding reinforcing materials such as particles and fibers to the rubber matrix to improve the wear resistance of the material.

[0005] CN112592550A discloses a fluororubber material for oil seals, the formula of which is as follows: 100 parts of 2462 type fluororubber, 9-13 parts of acid absorption accelerator, 20-25 parts of multi-component friction-reducing heat-conducting material, 10-14 parts of carbon black, 1.5-2.0 parts of composite organic polymer additive, and No. 3 vulcanizing agent. The rubber material has low friction, high thermal conductivity, can be used in a wide temperature range, and has stable performance.

[0006] CN111004460A discloses a fluororubber material for oil seals, which is made of 246 type fluororubber as the base material, and is mixed with anti-friction, heat-conducting materials and special additives to obtain a rubber compound. The material has excellent high strength, low brittle temperature, low friction and high thermal conductivity, as well as good heat-resistant tearing performance and good processing performance. Summary of the invention

[0007] The purpose of the present invention is to solve the problem of large wear of oil seal rubber materials in the prior art, and proposes a wear-resistant special rubber for continuous high-speed motor transmission oil seal and a preparation method thereof, which can meet the oil resistance requirements of the oil seal, have good sealing performance, and at the same time have excellent wear resistance and service life, thereby solving the problem of poor wear resistance of the motor transmission oil seal at continuous high speed.

[0008] A wear-resistant special rubber for continuous high-speed motor transmission oil seal, composed of the following materials by mass:

[0009] Fluororubber: 100 parts;

[0010] Diatomaceous earth: 15-30 parts;

[0011] Calcium silicate: 15-30 parts

[0012] Red iron oxide: 5-10 parts;

[0013] Carbon black: 2-6 parts;

[0014] Magnesium oxide: 1-5 parts;

[0015] Calcium hydroxide: 5-10 parts

[0016] Vulcanizing agent: 1-2 parts;

[0017] Molybdenum disulfide: 5-10 parts.

[0018] Preferably, the wear-resistant special rubber is composed of the following materials by mass:

[0019] Fluororubber: 100 parts;

[0020] Diatomaceous earth: 15-20 parts;

[0021] Calcium silicate: 18-23 parts;

[0022] Red iron oxide: 6-8 parts;

[0023] Carbon black: 3-5 parts;

[0024] Magnesium oxide: 2-4 parts;

[0025] Calcium hydroxide: 5-7 parts;

[0026] Vulcanizing agent: 1.3-1.5 parts;

[0027] Molybdenum disulfide: 5-7 parts.

[0028] Preferably, the fluorine content in the fluororubber is 60-65wt%.

[0029] Preferably, the particle size of the red iron oxide, carbon black, magnesium oxide and calcium hydroxide is 10-500 nm, preferably 50-100 nm.

[0030] Preferably, the vulcanizing agent is bisphenol AF.

[0031] The particle size of the molybdenum disulfide is 0.1-10 μm, more preferably 1-5 μm.

[0032] The present invention provides a method for preparing a wear-resistant special rubber for a continuous high-speed motor transmission oil seal, comprising the following steps:

[0033] S1. First, put the fluororubber into the internal mixer and mix it at a speed of 30 rpm for 60-90 seconds. Then, add diatomaceous earth, calcium silicate, magnesium oxide and calcium hydroxide and continue mixing at the same speed for 180-240 seconds until there is no white powder on the surface.

[0034] S2, adding carbon black, red iron oxide and molybdenum disulfide to the mixed materials in step S1, and then continuing to mix at a speed of 30 rpm for 60-120 seconds until the color is uniform;

[0035] S3, discharge the mixed materials in step S2 to the open mixing mill, thinly pass through 5-10 times, and wait until there is no obvious color difference on the surface of the rubber material, and leave it for 16-24 hours;

[0036] S4, putting the mixture obtained in step S3 into the internal mixer again, adding the vulcanizing agent bisphenol AF thereto, and mixing for 60-90s at a rotation speed of 10-50rpm;

[0037] S5. Discharge the mixed materials in step S4 to an open mixing mill, and thinly pass through 5-10 times before unrolling.

[0038] Molybdenum disulfide is an inorganic rigid particle, and its friction mechanism is the ball bearing effect, forming a spherical rolling between the friction surfaces to play a role in reducing friction. At the same time, during the friction process, molybdenum disulfide will be flattened by shearing, forming a layer of molybdenum disulfide physical film on the friction surface, which plays the role of bearing load and blocking the contact between the two friction surfaces, thereby achieving the effect of anti-wear and wear reduction. In addition, its microcrystalline structure can play an inductive role in fluororubber, forming physical cross-linking points of fluororubber, increasing the cross-linking density of rubber, improving the vulcanization of rubber, and reducing the compression permanent deformation of vulcanized rubber.

[0039] Beneficial effects of the present invention:

[0040] The rubber prepared by the present invention has good comprehensive physical properties, meets the oil resistance requirements during the use of oil seals, and at the same time has excellent wear resistance, which prolongs the service life of the oil seals and solves the problem of poor wear resistance of ordinary oil seal materials under continuous high speeds. The rubber is suitable for continuous high speed motor transmissions and rubber products with high sealing requirements. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0042] Example 1

[0043] A wear-resistant special rubber for continuous high-speed motor transmission oil seal, composed of the following materials by mass:

[0044] Fluororubber: 100 parts;

[0045] Diatomaceous earth: 18 parts;

[0046] Calcium silicate: 20 parts;

[0047] Red iron oxide: 5 parts;

[0048] Carbon black: 4 parts;

[0049] Magnesium oxide: 3 parts;

[0050] Calcium hydroxide: 6 parts;

[0051] Vulcanizing agent: 1.4 parts;

[0052] Molybdenum disulfide: 3 parts.

[0053] The method for preparing rubber comprises the following steps:

[0054] S1. First, put the fluororubber into the internal mixer and mix it at a speed of 30 rpm for 90 seconds. Then, add diatomaceous earth, calcium silicate, magnesium oxide and calcium hydroxide and continue mixing for 180 seconds at the same speed until there is no white powder on the surface.

[0055] S2, adding carbon black N990, red iron oxide S-130 and molybdenum disulfide to the mixed materials in step S1 and continuing to mix at a speed of 30 rpm for 60 seconds until the color is uniform;

[0056] S3, discharge the mixed materials in step S2 to the open mixing mill, thinly pass through 6 times, and wait until there is no obvious color difference on the surface of the rubber material, and leave it for 16 hours;

[0057] S4, the mixture obtained in step S3 is put into the internal mixer again, and the vulcanizing agent bisphenol AF is added thereto, and the mixture is mixed at a speed of 25 rpm for 90 seconds;

[0058] S5. The mixed materials in step S4 are discharged to an open mixing mill and thinly passed 8 times before being unrolled.

[0059] Example 2

[0060] A wear-resistant special rubber for continuous high-speed motor transmission oil seal, composed of the following materials by mass:

[0061] Fluororubber: 100 parts;

[0062] Diatomaceous earth: 18 parts;

[0063] Calcium silicate: 20 parts;

[0064] Red iron oxide: 5 parts;

[0065] Carbon black: 4 parts;

[0066] Magnesium oxide: 3 parts;

[0067] Calcium hydroxide: 6 parts;

[0068] Vulcanizing agent: 1.4 parts;

[0069] Molybdenum disulfide: 5 parts.

[0070] A method for preparing wear-resistant special rubber for continuous high-speed motor transmission oil seal comprises the following steps:

[0071] S1. First, put the fluororubber into the internal mixer and mix it at a speed of 30 rpm for 90 seconds. Then, add diatomaceous earth, calcium silicate, magnesium oxide and calcium hydroxide and continue mixing at the same speed for 240 seconds until there is no white powder on the surface.

[0072] S2, adding carbon black N990, red iron oxide S-130 and molybdenum disulfide to the mixed materials in step S1 and continuing to mix at a speed of 30 rpm for 60 seconds until the color is uniform;

[0073] S3, discharge the mixed materials in step S2 to the open mixing mill, thinly pass through 6 times, and wait until there is no obvious color difference on the surface of the rubber material, and leave it for 16 hours;

[0074] S4, putting the mixture obtained in step S3 into the internal mixer again, adding bisphenol AF thereto, and mixing at a rotation speed of 25 rpm for 90 s;

[0075] S5. The mixed materials in step S4 are discharged to an open mixing mill and thinly passed 8 times before being unrolled.

[0076] Example 3

[0077] A wear-resistant special rubber for continuous high-speed motor transmission oil seal, composed of the following materials by mass:

[0078] Fluororubber: 100 parts;

[0079] Diatomaceous earth: 18 parts;

[0080] Calcium silicate: 20 parts;

[0081] Red iron oxide: 5 parts;

[0082] Carbon black: 4 parts;

[0083] Magnesium oxide: 3 parts;

[0084] Calcium hydroxide: 6 parts;

[0085] Vulcanizing agent: 1.4 parts;

[0086] Molybdenum disulfide: 10 parts.

[0087] The method for preparing rubber comprises the following steps:

[0088] S1. First, put the fluororubber into the internal mixer and mix it at a speed of 30 rpm for 60-90 seconds. Then, add diatomaceous earth, calcium silicate, magnesium oxide and calcium hydroxide and continue mixing at the same speed for 180-240 seconds until there is no white powder on the surface.

[0089] S2, adding carbon black N990, red iron oxide S-130 and molybdenum disulfide to the mixed materials in step S1 and continuing to mix at a speed of 30 rpm for 60-120 seconds until the color is uniform;

[0090] S3, discharge the mixed materials in step S2 to the open mixing mill, thinly pass through 6 times, and wait until there is no obvious color difference on the surface of the rubber material, and leave it for 16 hours;

[0091] S4, putting the mixture obtained in step S3 into the internal mixer again, adding the vulcanizing agent bisphenol AF thereto, and mixing at a rotation speed of 25 rpm for 60-90 seconds;

[0092] S5. The mixed materials in step S4 are discharged to an open mixing mill and thinly passed 8 times before being unrolled.

[0093] Comparative Example 1

[0094] A wear-resistant special rubber for motor transmission oil seal, composed of the following materials by mass:

[0095] Fluororubber: 100 parts;

[0096] Diatomaceous earth: 18 parts;

[0097] Calcium silicate: 20 parts;

[0098] Red iron oxide: 5 parts;

[0099] Carbon black: 4 parts;

[0100] Magnesium oxide: 3 parts;

[0101] Calcium hydroxide: 6 parts;

[0102] Vulcanizing agent: 1.4 parts;

[0103] Graphite: 5 parts.

[0104] A method for preparing wear-resistant special rubber for motor transmission oil seal comprises the following steps:

[0105] S1. First, put ordinary fluororubber into an internal mixer and mix it at a speed of 30 rpm for 60-90 seconds. Then, add diatomaceous earth, calcium silicate, magnesium oxide and calcium hydroxide and continue mixing for 180-240 seconds at the same speed until there is no white powder on the surface.

[0106] S2, adding carbon black N990, iron oxide red S-130 and graphite to the mixed materials in step S1, and continuing to mix at a speed of 30 rpm for 60-120 seconds until the color is uniform;

[0107] S3, discharge the mixed materials in step S2 to the open mixing mill, thinly pass through 6 times, and wait until there is no obvious color difference on the surface of the rubber material, and leave it for 16 hours;

[0108] S4, putting the mixture obtained in step S3 into the internal mixer again, adding the vulcanizing agent bisphenol AF thereto, and mixing at a rotation speed of 25 rpm for 60-90 seconds;

[0109] S5. The mixed materials in step S4 are discharged to an open mixing mill and thinly passed 8 times before being unrolled.

[0110] Comparative Example 2

[0111] A wear-resistant special rubber for motor transmission oil seal, composed of the following materials by mass:

[0112] Fluororubber: 100 parts;

[0113] Diatomaceous earth: 18 parts;

[0114] Calcium silicate: 20 parts;

[0115] Red iron oxide: 5 parts;

[0116] Carbon black: 4 parts;

[0117] Magnesium oxide: 3 parts;

[0118] Calcium hydroxide: 6 parts;

[0119] Vulcanizing agent: 1.4 parts;

[0120] Graphite: 10 parts.

[0121] A method for preparing wear-resistant special rubber for motor transmission oil seal comprises the following steps:

[0122] S1. First, put ordinary fluororubber into an internal mixer and mix it at a speed of 30 rpm for 60-90 seconds. Then, add diatomaceous earth, calcium silicate, magnesium oxide and calcium hydroxide and continue mixing for 180-240 seconds at the same speed until there is no white powder on the surface.

[0123] S2, adding carbon black N990, iron oxide red S-130 and graphite to the mixed materials in step S1, and continuing to mix at a speed of 30 rpm for 60-120 seconds until the color is uniform;

[0124] S3, discharge the mixed materials in step S2 to the open mixing mill, thinly pass through 6 times, and wait until there is no obvious color difference on the surface of the rubber material, and leave it for 16 hours;

[0125] S4, putting the mixture obtained in step S3 into the internal mixer again, adding the vulcanizing agent bisphenol AF thereto, and mixing at a rotation speed of 25 rpm for 60-90 seconds;

[0126] S5. The mixed materials in step S4 are discharged to an open mixing mill and thinly passed 8 times before being unrolled.

[0127] Comparative Example 3

[0128] A wear-resistant special rubber for motor transmission oil seal, composed of the following materials by mass:

[0129] Fluororubber: 100 parts;

[0130] Diatomaceous earth: 18 parts;

[0131] Calcium silicate: 20 parts;

[0132] Red iron oxide: 5 parts;

[0133] Carbon black: 4 parts;

[0134] Magnesium oxide: 3 parts;

[0135] Calcium hydroxide: 6 parts;

[0136] Vulcanizing agent: 1.4 parts;

[0137] Polytetrafluoroethylene: 5 parts.

[0138] A method for preparing wear-resistant special rubber for motor transmission oil seal comprises the following steps:

[0139] S1. First, put ordinary fluororubber into an internal mixer and mix it at a speed of 30 rpm for 60-90 seconds. Then, add diatomaceous earth, calcium silicate, magnesium oxide and calcium hydroxide and continue mixing for 180-240 seconds at the same speed until there is no white powder on the surface.

[0140] S2, adding carbon black N990, iron oxide red S-130 and polytetrafluoroethylene to the mixed materials in step S1, and continuing to mix at a speed of 30 rpm for 60-120 seconds until the color is uniform;

[0141] S3, discharge the mixed materials in step S2 to the open mixing mill, thinly pass through 6 times, and wait until there is no obvious color difference on the surface of the rubber material, and leave it for 16 hours;

[0142] S4, putting the mixture obtained in step S3 into the internal mixer again, adding the vulcanizing agent bisphenol AF thereto, and mixing at a rotation speed of 25 rpm for 60-90 seconds;

[0143] S5. The mixed materials in step S4 are discharged to an open mixing mill and thinly passed 8 times before being unrolled.

[0144] Comparative Example 4

[0145] A wear-resistant special rubber for motor transmission oil seal, composed of the following materials by mass:

[0146] Fluororubber: 100 parts;

[0147] Diatomaceous earth: 18 parts;

[0148] Calcium silicate: 20 parts;

[0149] Red iron oxide: 5 parts;

[0150] Carbon black: 4 parts;

[0151] Magnesium oxide: 3 parts;

[0152] Calcium hydroxide: 6 parts;

[0153] Vulcanizing agent: 1.4 parts;

[0154] Polytetrafluoroethylene: 10 parts.

[0155] A method for preparing wear-resistant special rubber for motor transmission oil seal comprises the following steps:

[0156] S1. First, put ordinary fluororubber into an internal mixer and mix it at a speed of 30 rpm for 60-90 seconds. Then, add diatomaceous earth, calcium silicate, magnesium oxide and calcium hydroxide and continue mixing for 180-240 seconds at the same speed until there is no white powder on the surface.

[0157] S2, adding carbon black N990, iron oxide red S-130 and polytetrafluoroethylene to the mixed materials in step S1, and continuing to mix at a speed of 30 rpm for 60-120 seconds until the color is uniform;

[0158] S3, discharge the mixed materials in step S2 to the open mixing mill, thinly pass through 6 times, and wait until there is no obvious color difference on the surface of the rubber material, and leave it for 16 hours;

[0159] S4, putting the mixture obtained in step S3 into the internal mixer again, adding the vulcanizing agent bisphenol AF thereto, and mixing at a rotation speed of 25 rpm for 60-90 seconds;

[0160] S5. The mixed materials in step S4 are discharged to an open mixing mill and thinly passed 8 times before being unrolled.

[0161] The experimental data obtained according to the above 7 implementation schemes are listed in a table, as shown in the following table:

[0162] Test items unit Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 hardness Shao A 73 74 74 72 72 71 72 Tensile Strength Mpa 12.43 13.57 13.79 14.88 15.64 14.62 9.43 Elongation at break ％ 278 269 271 257 244 256 303 Akron Wear cm3 0.54 0.32 0.29 0.48 0.58 0.24 0.66 Tear strength <![CDATA[KN·m -1 ]]> 26.71 26.37 26.13 24.81 22.74 22.32 18.98 Compression set ％ 18.64 21.23 23.75 25.74 25.90 31.17 29.63

[0163] According to the comparison of the performance of the rubber obtained from the above examples 1-3 and comparative examples 1-4, it can be seen that the overall performance of the product obtained in Example 2 is the most excellent; by changing the amount of molybdenum disulfide, the tensile properties of the vulcanized rubber are slightly changed, but the tearing properties do not change much. However, as the amount of molybdenum disulfide increases, the compression permanent deformation of the vulcanized rubber increases. This is because although the microcrystalline structure of molybdenum disulfide in fluororubber acts as a physical crosslinking point during the vulcanization process, which increases the crosslinking density of the rubber and improves the vulcanization of the fluororubber, as the amount of molybdenum disulfide increases, the rubber content decreases, which increases the compression permanent deformation. Therefore, the amount of molybdenum disulfide is preferably 5 parts; graphite and polytetrafluoroethylene have effective improvements on the friction reduction properties of fluororubber, but due to the large amount of graphite, a small amount of graphite particle aggregates are likely to appear in the rubber, which increases its wear, and the addition of polytetrafluoroethylene has a certain plasticizing effect on the rubber, reducing the crosslinking density of the vulcanized rubber, thereby reducing its tensile strength and tear strength.

[0164] The present invention has been described above with reference to the preferred embodiments, but the protection scope of the present invention is not limited thereto, and all technical solutions falling within the scope of the claims are within the protection scope of the present invention. Various improvements may be made to the present invention and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A wear-resistant special rubber for continuous high-speed motor transmission oil seal, characterized in that: The following materials are used in proportion by mass composition: Fluororubber: 100 parts; Diatomaceous earth: 15-30 parts; Calcium silicate: 15-30 parts Red iron oxide: 5-10 parts; Carbon black: 2-6 parts; Magnesium oxide: 1-5 parts; Calcium hydroxide: 5-10 parts Vulcanizing agent: 1-2 parts; Molybdenum disulfide: 5-10 parts.

2. The wear-resistant special rubber for continuous high-speed motor transmission oil seal according to claim 1, characterized in that: The materials are as follows: Fluororubber: 100 parts; Diatomaceous earth: 15-20 parts; Calcium silicate: 18-23 parts; Red iron oxide: 6-8 parts; Carbon black: 3-5 parts; Magnesium oxide: 2-4 parts; Calcium hydroxide: 5-7 parts; Vulcanizing agent: 1.3-1.5 parts; Molybdenum disulfide: 5-7 parts.

3. The wear-resistant special rubber for continuous high-speed motor transmission oil seal according to claim 1, characterized in that: The fluorine content in the fluorine rubber is 60-65wt%.

4. The wear-resistant special rubber for continuous high-speed motor transmission oil seal according to claim 1, characterized in that: The particle sizes of the red iron oxide, carbon black, magnesium oxide and calcium hydroxide are 10-500 nm, preferably 50-100 nm.

5. The wear-resistant special rubber for continuous high-speed motor transmission oil seal according to claim 1, characterized in that: The vulcanizing agent is bisphenol AF.

6. The wear-resistant special rubber for continuous high-speed motor transmission oil seal according to claim 1, characterized in that: The particle size of the molybdenum disulfide is 0.1-10 μm, more preferably 1-5 μm.

7. A method for preparing a wear-resistant special rubber for continuous high-speed motor transmission oil seal according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. First, put the fluororubber into the internal mixer and mix it at a speed of 30 rpm for 60-90 seconds. Then, add diatomaceous earth, calcium silicate, magnesium oxide and calcium hydroxide and continue mixing at the same speed for 180-240 seconds until there is no white powder on the surface. S2, adding carbon black, red iron oxide and molybdenum disulfide to the mixed materials in step S1, and then continuing to mix at a speed of 30 rpm for 60-120 seconds until the color is uniform; S3, discharge the mixed materials in step S2 to the open mixing mill, thinly pass through 5-10 times, and wait until there is no obvious color difference on the surface of the rubber material, and leave it for 16-24 hours; S4, putting the mixture obtained in step S3 into the internal mixer again, adding the vulcanizing agent bisphenol AF thereto, and mixing for 60-90s at a rotation speed of 10-50rpm; S5. Discharge the mixed materials in step S4 to an open mixing mill, and thinly pass through 5-10 times before unrolling.