Composite material for anti-seismic ultra-silence bearing sealing ring and preparation method of composite material

Abstract

The invention relates to the technical field of high-end precision machinery, and provides a composite material for an anti-seismic ultra-silence bearing sealing ring and a preparation method of the composite material in order to solve the problems that in the prior art, a damping bearing is poor in silence effect and short in service life. The composite material for the shock-resistant ultra-silence bearing sealing ring is prepared from the following raw materials in parts by weight: 100 parts of polyether polyurethane prepolymer, 5 to 10 parts of chain extender, 3 to 8 parts of cross-linking agent, 10 to 30 parts of reinforcing fiber and 1 to 5 parts of anti-aging additive. The composite material is good in mechanical property, capable of bearing high impact, good in wear resistance and long in service life.

Description

Technical Field

[0001] This invention relates to the field of high-precision machinery, and in particular to a composite material for shock-resistant and ultra-quiet bearing sealing rings and its preparation method. Background Technology

[0002] A damping bearing is a type of bearing with damping function, which reduces system vibration and noise. The structure of a damping bearing includes an inner ring, an outer ring, rolling elements, and damping material, with the damping material installed between the inner and outer rings. The damping material effectively eliminates the vibration generated during bearing rotation, thereby reducing bearing noise. Under an axial load of 53000N, the damping layer of a damping bearing should not have strength defects such as compression, cracks, or distortion; the radial runout of the shaft system should not exceed 0.3mm; the vibration reduction should be no less than 3dB in the 200Hz–4kHz frequency range; and the storage life of a damping bearing in a nitrogen-filled, sealed environment should be no less than 8 years.

[0003] The seals of damping bearings need to have good sealing and dustproof capabilities to prevent external substances from corroding the interior of the bearing, especially preventing aging and failure of the damping material. The seals also play a role in reducing operating noise. Currently, there is still room for improvement in the shock resistance, wear resistance, and noise reduction performance of existing damping bearing seals. For example, invention patent CN115678132A discloses a rubber material for automotive bearing seals, which has improved fatigue resistance, but it is not specifically designed for shock-resistant, ultra-quiet bearings. Summary of the Invention

[0004] To overcome the problems of poor noise reduction and short lifespan of existing damping bearings, this invention provides a composite material for shock-resistant, ultra-quiet bearing seals. This composite material has good mechanical properties, can withstand strong impacts, and also has good wear resistance and a long service life. This invention also provides a method for preparing the composite material for shock-resistant, ultra-quiet bearing seals.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A composite material for shock-resistant, ultra-quiet bearing seals comprises the following raw materials in parts by weight: 100 parts of polyether-type polyurethane prepolymer, 5-10 parts of chain extender, 3-8 parts of crosslinking agent, 10-30 parts of reinforcing fiber and 1-5 parts of anti-aging additive.

[0006] This invention uses polyether polyurethane as the base resin for the sealing ring. Polyether polyurethane has high strength and hardness, can withstand high tensile and compressive forces, and also has high impact resistance and abrasion resistance. In terms of chemical resistance and temperature stability, it can withstand corrosion from various organic reagents and acids and alkalis, and exhibits good stability at high temperatures.

[0007] Preferably, the polyether-type polyurethane prepolymer is obtained by prepolymerization of diisocyanate and polyether polyol under the action of a catalyst, and the molar ratio of isocyanate groups to hydroxyl groups in the polyether-type polyurethane prepolymer is (0.9~1.1):1.

[0008] Preferably, the catalyst is an organotin catalyst, and the amount of catalyst added is 0.3 to 0.8% of the total mass of diisocyanate and polyether polyol.

[0009] Preferably, the polyether-type polyurethane prepolymer is obtained by reacting a mixture of catalyst, diisocyanate and polyether polyol at 70–85°C for 2–3.5 h.

[0010] Preferably, the diisocyanate is one or more of terephthalic diisocyanate, toluene diisocyanate, and diphenylmethane diisocyanate.

[0011] Diisocyanates with symmetrical structures can impart higher hardness, tensile strength and tear strength to polyurethanes.

[0012] Preferably, the polyether polyol is a polytetrahydrofuran polyol.

[0013] Preferably, the chain extender is one or more of 1,4-butanediol, 1,6-hexanediol, N,N-dihydroxy(diisopropyl)aniline, and hydroquinone-bis(β-hydroxyethyl) ether.

[0014] More preferably, the chain extender is hydroquinone-bis(β-hydroxyethyl) ether.

[0015] Preferably, the crosslinking agent includes stearic acid, zinc oxide and a vulcanizing agent, wherein the mass ratio of stearic acid, zinc oxide and vulcanizing agent is (2-3):(0.5-2):(1-2).

[0016] Preferably, the vulcanizing agent is sulfur, a sulfur-containing compound, or an organic peroxide.

[0017] Preferably, the reinforcing fibers are glass fibers and ultra-high molecular weight polyethylene fibers.

[0018] Ultra-high molecular weight polyethylene fiber has high strength and good compatibility with the base resin. When combined with glass fiber, it can enhance the mechanical properties, heat resistance and wear resistance of the sealing ring.

[0019] Preferably, the anti-aging additives include antioxidants and / or heat stabilizers.

[0020] A method for preparing the above-mentioned composite material for anti-vibration and ultra-quiet bearing sealing ring includes the following steps: S1. Mix the raw materials of the anti-vibration ultra-quiet bearing sealing ring and react them at 70-85℃ for 3-5 hours; S2. Reheat to 120-140℃ for 20-50 minutes, then vulcanize at 100-115℃ for 2-5 hours, and cool to set to obtain the shock-resistant and ultra-quiet bearing seal ring.

[0021] This invention employs a low-temperature, multiple vulcanization process, which can increase the crosslinking density of the sealing ring material, thereby enhancing its wear resistance, sealing performance, and hardness.

[0022] Therefore, the present invention has the following beneficial effects: it has good mechanical properties, can improve the shock resistance and noise reduction effect of damping bearings, and greatly extend the storage life of damping bearings. Detailed Implementation

[0023] The present invention will be further described below with reference to specific implementation methods.

[0024] Example 1 A composite material for shock-resistant and ultra-quiet bearing sealing rings is composed of the following raw materials in parts by weight: 100 parts of polyether-type polyurethane prepolymer, 5 parts of hydroquinone-bis(β-hydroxyethyl) ether, 2 parts of stearic acid, 0.5 parts of nano zinc oxide, 1 part of sulfur, 20 parts of ultra-high molecular weight polyethylene fiber (purchased from Daehan Oil & Chemical, brand name U070, molecular weight 7 million, diameter 125 mesh) and 1 part of antioxidant AW. The polyether-type polyurethane prepolymer is obtained by mixing dibutyltin dilaurate, diphenylmethane diisocyanate and polytetrahydrofuran diol and reacting them at 78°C for 2 hours. The molar ratio of diphenylmethane diisocyanate to polytetrahydrofuran diol is 1.05:1, and the mass of dibutyltin dilaurate is 0.5% of the total mass of diphenylmethane diisocyanate and polytetrahydrofuran diol. The composite material for the shock-resistant, ultra-quiet bearing seal ring is prepared by the following steps: S1. Mix polyether-type polyurethane prepolymer, hydroquinone-bis(β-hydroxyethyl) ether, stearic acid, nano zinc oxide, sulfur, ultra-high molecular weight polyethylene fiber and antioxidant AW and react at 82°C for 3 hours. S2. Then add it to the flat vulcanizing machine and heat it to 130℃ for 30 minutes, then vulcanize it at 110℃ for 8 hours, and cool and shape it to obtain the composite material for shock-resistant and ultra-quiet bearing sealing ring.

[0025] Example 2 A composite material for shock-resistant, ultra-quiet bearing sealing rings differs from Example 1 in that it uses a different chain extender. Its formulation consists of the following raw materials in parts by weight: 100 parts polyether-type polyurethane prepolymer, 5 parts 1,6-hexanediol, 2 parts stearic acid, 0.5 parts nano-zinc oxide, 1 part sulfur, 20 parts ultra-high molecular weight polyethylene fiber (purchased from Daehan Oil & Chemical, brand name U070, molecular weight 7 million, diameter 125 mesh), and 1 part antioxidant AW. The polyether-type polyurethane prepolymer is obtained by reacting a mixture of dibutyltin dilaurate, diphenylmethane diisocyanate, and polytetrahydrofurandiol at 78°C for 2 hours. The molar ratio of diphenylmethane diisocyanate to polytetrahydrofurandiol is 1.05:1, and the mass of dibutyltin dilaurate is 0.5% of the total mass of diphenylmethane diisocyanate and polytetrahydrofurandiol. The composite material for the shock-resistant, ultra-quiet bearing seal ring is prepared by the following steps: S1. Mix polyether-type polyurethane prepolymer, 1,6-hexanediol, stearic acid, nano zinc oxide, sulfur, ultra-high molecular weight polyethylene fiber and antioxidant AW and react at 82°C for 3 hours. S2. Then add it to the flat vulcanizing machine and heat it to 130℃ for 30 minutes, then vulcanize it at 110℃ for 8 hours, and cool and shape it to obtain the composite material for shock-resistant and ultra-quiet bearing sealing ring.

[0026] Example 3 A composite material for shock-resistant, ultra-quiet bearing sealing rings differs from Example 1 in that the polyether-type polyurethane prepolymer is different and the proportion is also different. Its formula consists of the following raw materials in parts by weight: 100 parts of polyether-type polyurethane prepolymer, 10 parts of hydroquinone-bis(β-hydroxyethyl) ether, 2 parts of stearic acid, 0.5 parts of nano zinc oxide, 2 parts of dicumyl peroxide, 30 parts of ultra-high molecular weight polyethylene fiber (purchased from Daehan Oil & Chemical, brand name U070, molecular weight 7 million, diameter 125 mesh) and 2 parts of antioxidant AW. The polyether-type polyurethane prepolymer is obtained by mixing dibutyltin dilaurate, terephthalate diisocyanate and polytetrahydrofuran glycol and reacting them at 78°C for 2 hours. The molar ratio of terephthalate diisocyanate and polytetrahydrofuran glycol is 1:1, and the mass of dibutyltin dilaurate is 0.5% of the total mass of terephthalate diisocyanate and polytetrahydrofuran glycol. The composite material for the shock-resistant, ultra-quiet bearing seal ring is prepared by the following steps: S1. Mix polyether-type polyurethane prepolymer, hydroquinone-bis(β-hydroxyethyl) ether, stearic acid, nano zinc oxide, dicumyl peroxide, ultra-high molecular weight polyethylene fiber and antioxidant AW and react at 82°C for 3 hours. S2. Then add it to the flat vulcanizing machine and heat it to 130℃ for 30 minutes, then vulcanize it at 110℃ for 8 hours, and cool and shape it to obtain the composite material for shock-resistant and ultra-quiet bearing sealing ring.

[0027] Example 4 A composite material for shock-resistant and ultra-quiet bearing sealing rings is composed of the following raw materials in parts by weight: 100 parts of polyether-type polyurethane prepolymer, 5 parts of N,N-dihydroxy(diisopropyl)aniline, 2 parts of stearic acid, 0.5 parts of nano zinc oxide, 2 parts of sulfur, 20 parts of ultra-high molecular weight polyethylene fiber (purchased from Daehan Oil & Chemical, brand name U070, molecular weight 7 million, diameter 125 mesh) and 1 part of antioxidant 5057. The polyether-type polyurethane prepolymer is obtained by mixing dibutyltin dilaurate, diphenylmethane diisocyanate and tetrahydrofuran-propylene oxide copolymer diol and reacting them at 78°C for 2 hours. The molar ratio of diphenylmethane diisocyanate and tetrahydrofuran-propylene oxide copolymer diol is 1.05:1, and the mass of dibutyltin dilaurate is 0.5% of the total mass of diphenylmethane diisocyanate and tetrahydrofuran-propylene oxide copolymer diol. The composite material for the shock-resistant, ultra-quiet bearing seal ring is prepared by the following steps: S1. Mix polyether-type polyurethane prepolymer, N,N-dihydroxy(diisopropyl)aniline, stearic acid, nano zinc oxide, sulfur, ultra-high molecular weight polyethylene fiber and antioxidant 5057 and react at 82°C for 3 hours. S2. Then add it to the flat vulcanizing machine and heat it to 130℃ for 30 minutes, then vulcanize it at 110℃ for 8 hours, and cool and shape it to obtain the composite material for shock-resistant and ultra-quiet bearing sealing ring.

[0028] Example 5 A composite material for shock-resistant and ultra-quiet bearing sealing rings is composed of the following raw materials in parts by weight: 100 parts of polyether-type polyurethane prepolymer, 5 parts of N,N-dihydroxy(diisopropyl)aniline, 2 parts of stearic acid, 0.5 parts of nano zinc oxide, 2 parts of dicumyl peroxide, 20 parts of ultra-high molecular weight polyethylene fiber (purchased from Daehan Oil & Chemical, brand name U070, molecular weight 7 million, diameter 125 mesh) and 1 part of stabilizer B1411. The polyether-type polyurethane prepolymer is obtained by mixing dibutyltin dilaurate, toluene diisocyanate and tetrahydrofuran-propylene oxide copolymer diol and reacting them at 78°C for 3 hours. The molar ratio of toluene diisocyanate and tetrahydrofuran-propylene oxide copolymer diol is 0.98:1, and the mass of dibutyltin dilaurate is 0.5% of the total mass of toluene diisocyanate and tetrahydrofuran-propylene oxide copolymer diol. The composite material for the shock-resistant, ultra-quiet bearing seal ring is prepared by the following steps: S1. Mix polyether-type polyurethane prepolymer, N,N-dihydroxy(diisopropyl)aniline, stearic acid, nano zinc oxide, diisopropylbenzene peroxide, ultra-high molecular weight polyethylene fiber and stabilizer B1411 and react at 82°C for 3 hours. S2. Then add it to the flat vulcanizing machine and heat it to 130℃ for 30 minutes, then vulcanize it at 110℃ for 8 hours, and cool and shape it to obtain the composite material for shock-resistant and ultra-quiet bearing sealing ring.

[0029] Example 6 A composite material for shock-resistant and ultra-quiet bearing sealing rings is composed of the following raw materials in parts by weight: 100 parts of polyether-type polyurethane prepolymer, 5 parts of N,N-dihydroxy(diisopropyl)aniline, 2 parts of stearic acid, 0.5 parts of nano zinc oxide, 2 parts of dicumyl peroxide, 20 parts of ultra-high molecular weight polyethylene fiber (purchased from Daehan Oil & Chemical, brand name U070, molecular weight 7 million, diameter 125 mesh) and 1 part of stabilizer B1411. The polyether-type polyurethane prepolymer is obtained by mixing dibutyltin dilaurate, toluene diisocyanate and tetrahydrofuran-propylene oxide copolymer diol and reacting them at 78°C for 3 hours. The molar ratio of toluene diisocyanate and tetrahydrofuran-propylene oxide copolymer diol is 0.98:1, and the mass of dibutyltin dilaurate is 0.5% of the total mass of toluene diisocyanate and tetrahydrofuran-propylene oxide copolymer diol. The preparation method of this anti-vibration ultra-quiet bearing seal ring composite material differs from that of Example 5 in that the vulcanization temperature is different. Specifically, it is prepared by the following steps: S1. Mix polyether-type polyurethane prepolymer, N,N-dihydroxy(diisopropyl)aniline, stearic acid, nano zinc oxide, diisopropylbenzene peroxide, ultra-high molecular weight polyethylene fiber and stabilizer B1411 and react at 82°C for 3 hours. S2. Then add it to the flat vulcanizing machine and heat it to 120℃ for 50 minutes, then vulcanize it at 105℃ for 8 hours, and cool and shape it to obtain the composite material for shock-resistant and ultra-quiet bearing sealing ring.

[0030] Example 7 A composite material for shock-resistant and ultra-quiet bearing sealing rings is composed of the following raw materials in parts by weight: 100 parts of polyether-type polyurethane prepolymer, 5 parts of N,N-dihydroxy(diisopropyl)aniline, 2 parts of stearic acid, 0.5 parts of nano zinc oxide, 2 parts of sulfur, 10 parts of ultra-high molecular weight polyethylene fiber (purchased from Daehan Oil & Chemical, brand name U070, molecular weight 7 million, diameter 125 mesh) and 1 part of antioxidant 5057. The polyether-type polyurethane prepolymer is obtained by mixing dibutyltin dilaurate, diphenylmethane diisocyanate and tetrahydrofuran-propylene oxide copolymer diol and reacting them at 78°C for 3 hours. The molar ratio of diphenylmethane diisocyanate and tetrahydrofuran-propylene oxide copolymer diol is 1:1, and the mass of dibutyltin dilaurate is 0.5% of the total mass of diphenylmethane diisocyanate and tetrahydrofuran-propylene oxide copolymer diol. The composite material for the shock-resistant, ultra-quiet bearing seal ring is prepared by the following steps: S1. Mix polyether-type polyurethane prepolymer, N,N-dihydroxy(diisopropyl)aniline, stearic acid, nano zinc oxide, sulfur, ultra-high molecular weight polyethylene fiber and antioxidant 5057 and react at 82°C for 3 hours. S2. Then add it to the flat vulcanizing machine and heat it to 130℃ for 30 minutes, then vulcanize it at 110℃ for 8 hours, and cool and shape it to obtain the composite material for shock-resistant and ultra-quiet bearing sealing ring.

[0031] Example 8 A composite material for shock-resistant, ultra-quiet bearing seals comprises the following raw materials in parts by weight: 100 parts of polyether-type polyurethane prepolymer, 5 parts of hydroquinone-bis(β-hydroxyethyl) ether, 2 parts of stearic acid, 0.5 parts of nano-zinc oxide, 1 part of sulfur, 20 parts of ultra-high molecular weight polyethylene fiber (purchased from Daehan Oil & Chemical, grade U070, molecular weight 7 million, diameter 125 mesh), and 1 part of antioxidant AW. The polyether-type polyurethane prepolymer is obtained by reacting a mixture of dibutyltin dilaurate, toluene-2,4-diisocyanate, and polytetrahydrofuran diol at 78°C for 2 hours. The molar ratio of toluene-2,4-diisocyanate to polytetrahydrofuran diol is 1.05:1, and the mass of dibutyltin dilaurate is 0.5% of the total mass of toluene-2,4-diisocyanate and polytetrahydrofuran diol. This composite material for shock-resistant, ultra-quiet bearing seals is prepared by the following steps: S1. Mix polyether-type polyurethane prepolymer, hydroquinone-bis(β-hydroxyethyl) ether, stearic acid, nano zinc oxide, sulfur, ultra-high molecular weight polyethylene fiber and antioxidant AW and react at 82°C for 3 hours. S2. Then add it to the flat vulcanizing machine and heat it to 130℃ for 30 minutes, then vulcanize it at 110℃ for 8 hours, and cool and shape it to obtain the composite material for shock-resistant and ultra-quiet bearing sealing ring.

[0032] Comparative Example 1 A composite material for shock-resistant, ultra-quiet bearing seals differs from Example 1 in that it uses polyurethane instead of polyether-type polyurethane prepolymer. The formulation consists of the following raw materials in parts by weight: 100 parts polyurethane (brand name 1000), 5 parts hydroquinone-bis(β-hydroxyethyl) ether, 2 parts stearic acid, 0.5 parts nano zinc oxide, 1 part sulfur, 20 parts ultra-high molecular weight polyethylene fiber (purchased from Daehan Oil & Chemical, brand name U070, molecular weight 7 million, diameter 125 mesh) and 1 part antioxidant AW. The composite material for the shock-resistant, ultra-quiet bearing seal ring is prepared by the following steps: S1. Polyurethane, hydroquinone-bis(β-hydroxyethyl) ether, stearic acid, nano zinc oxide, sulfur, ultra-high molecular weight polyethylene fiber and antioxidant AW are mixed and reacted at 82°C for 3 hours. S2. Then add it to the flat vulcanizing machine and heat it to 130℃ for 30 minutes, then vulcanize it at 110℃ for 8 hours, and cool and shape it to obtain the composite material for shock-resistant and ultra-quiet bearing sealing ring.

[0033] Comparative Example 2 A composite material for shock-resistant, ultra-quiet bearing seals differs from Example 1 in that it does not use reinforcing fibers. Its formulation consists of the following raw materials in parts by weight: 100 parts of polyether-type polyurethane prepolymer, 5 parts of hydroquinone-bis(β-hydroxyethyl) ether, 2 parts of stearic acid, 0.5 parts of nano zinc oxide, 1 part of sulfur, and 1 part of antioxidant AW. The polyether-type polyurethane prepolymer is obtained by mixing dibutyltin dilaurate, diphenylmethane diisocyanate, and polytetrahydrofuran diol and reacting them at 78°C for 2 hours. The molar ratio of diphenylmethane diisocyanate to polytetrahydrofuran diol is 1.05:1, and the mass of dibutyltin dilaurate is 0.5% of the total mass of diphenylmethane diisocyanate and polytetrahydrofuran diol. The composite material for the shock-resistant, ultra-quiet bearing seal ring is prepared by the following steps: S1. Mix polyether-type polyurethane prepolymer, hydroquinone-bis(β-hydroxyethyl) ether, stearic acid, nano zinc oxide, sulfur and antioxidant AW and react at 82°C for 3 hours. S2. Then add it to the flat vulcanizing machine and heat it to 130℃ for 30 minutes, then vulcanize it at 110℃ for 8 hours, and cool and shape it to obtain the composite material for shock-resistant and ultra-quiet bearing sealing ring.

[0034] Comparative Example 3 A composite material for shock-resistant and ultra-quiet bearing sealing rings is composed of the following raw materials in parts by weight: 100 parts of polyether-type polyurethane prepolymer, 5 parts of hydroquinone-bis(β-hydroxyethyl) ether, 2 parts of stearic acid, 0.5 parts of nano zinc oxide, 1 part of sulfur, 20 parts of ultra-high molecular weight polyethylene fiber (purchased from Daehan Oil & Chemical, brand name U070, molecular weight 7 million, diameter 125 mesh) and 1 part of antioxidant AW. The polyether-type polyurethane prepolymer is obtained by mixing dibutyltin dilaurate, diphenylmethane diisocyanate and polytetrahydrofuran diol and reacting them at 78°C for 2 hours. The molar ratio of diphenylmethane diisocyanate to polytetrahydrofuran diol is 1.05:1, and the mass of dibutyltin dilaurate is 0.5% of the total mass of diphenylmethane diisocyanate and polytetrahydrofuran diol. The preparation method of this anti-vibration ultra-quiet bearing seal composite material differs from that of Example 1 in that it uses a one-step high-temperature vulcanization process, specifically prepared by the following steps: S1. Mix polyether-type polyurethane prepolymer, hydroquinone-bis(β-hydroxyethyl) ether, stearic acid, nano zinc oxide, sulfur, ultra-high molecular weight polyethylene fiber and antioxidant AW and react at 82°C for 3 hours. S2. Then add it to a flat vulcanizing machine and heat it to 150°C for 6 hours. After cooling and shaping, a composite material for shock-resistant and ultra-quiet bearing sealing rings is obtained.

[0035] The sealing performance, hardness, and heat aging resistance of the above examples and comparative examples were tested in accordance with GB / T1681-2009 Determination of Resilience of Vulcanized Rubber, GB / T 17782-1999 Test Method for Heat Aging of Vulcanized Rubber in Pressurized Air, and GB / T528-2009 Determination of Tensile Stress-Strain Properties of Vulcanized Rubber or Thermoplastic Rubber. The results are shown in the table below. project Rebound rate (%) Shore A hardness (°) Change rate of tensile properties (%) Example 1 32 71 0.98 Example 2 28 70 1.01 Example 3 31 75 0.95 Example 4 35 73 0.92 Example 5 32 72 1.02 Example 6 31 70 1.07 Example 7 33 67 1.05 Example 8 27 66 1.04 Comparative Example 1 23 62 1.21 Comparative Example 2 34 57 1.07 Comparative Example 3 29 68 1.11

[0036] As shown in the table above, the composite material for the anti-vibration and ultra-quiet bearing sealing ring obtained by this invention has good mechanical and sealing properties, high hardness and wear resistance, and long service life. When used in damping bearings, it can improve the anti-vibration and quietness of damping bearings.

[0037] Compared with Comparative Example 1, Example 1 showed improved resilience and hardness, and the change rate of tensile properties after heat aging was less than that of Comparative Example 1. This indicates that when polyether polyurethane is used as the base resin of the sealing ring, its strength and hardness are superior to polyurethane. Furthermore, polyether polyurethane has good wear resistance, heat aging resistance and stability, which can improve the sealing effect and service life of the bearing sealing ring.

[0038] In Comparative Example 2, no reinforcing fibers were added, resulting in the composite material for the shock-resistant ultra-quiet bearing seal having lower hardness and heat aging resistance than that of Example 1.

[0039] The vulcanization method of Comparative Example 3 is different from that of Example 1. Comparative Example 3 adopts one-step high-temperature vulcanization. Compared with the low-temperature multiple vulcanization process, the crosslinking density of the composite material for the anti-vibration ultra-quiet bearing seal ring obtained by one-step high-temperature vulcanization is lower, and the wear resistance, sealing performance and hardness are all reduced.

[0040] The toluene-2,4-diisocyanate used in Example 8 has an asymmetric structure. Compared with the symmetric diisocyanates used in Examples 1-7, its hardness and tensile properties are reduced, but its performance is still better than that of polyurethane.

Claims

1. A composite material for an anti-vibration ultra-quiet bearing seal ring, characterized by comprising: a base material layer; a first coating layer; a second coating layer; and a third coating layer. The raw materials include the following weight parts: 100 parts of polyether type polyurethane prepolymer, 5-10 parts of chain extender, 3-8 parts of crosslinking agent, 10-30 parts of reinforcing fiber and 1-5 parts of anti-aging auxiliary.

2. The composite material for an anti-vibration ultra-quiet bearing sealing ring according to claim 1, characterized in that, The polyether type polyurethane prepolymer is obtained by prepolymerization of diisocyanate and polyether polyol under the action of a catalyst, and the molar ratio of isocyanate groups to hydroxyl groups in the polyether type polyurethane prepolymer is (0.9-1.1):

1.

3. The anti-vibration ultra-silent bearing seal ring composite material according to claim 2, characterized in that, The diisocyanate is one or more of p-phenylene diisocyanate, toluene diisocyanate and diphenyl methane diisocyanate.

4. The composite material for an anti-vibration ultra-quiet bearing sealing ring according to claim 2 or 3, characterized in that, The polyether polyol is polytetrahydrofuran polyol.

5. The anti-vibration ultra-silent bearing seal ring composite material according to claim 4, characterized in that, The chain extender is one or more of 1,4-butanediol, 1,6-hexanediol, N,N-dihydroxy(diisopropyl)aniline and hydroquinone-bis(β-hydroxyethyl)ether.

6. The anti-vibration ultra-silent bearing seal ring composite material according to claim 1, characterized in that, The crosslinking agent includes stearic acid, zinc oxide and vulcanizing agent, and the mass ratio of stearic acid, zinc oxide and vulcanizing agent is (2-3):(0.5-2):(1-2).

7. The anti-vibration ultra-silent bearing seal ring composite material according to claim 6, characterized in that, The vulcanizing agent is sulfur, sulfur-containing compound or organic peroxide.

8. The anti-vibration ultra-silent bearing seal ring composite material according to claim 1, characterized in that, The reinforcing fiber is glass fiber and ultra-high molecular weight polyethylene fiber.

9. The anti-vibration ultra-silent bearing seal ring composite material according to claim 1, characterized in that, The anti-aging auxiliary includes antioxidant and / or heat stabilizer.

10. A method of preparing the composite material for the anti-vibration ultra-quiet bearing sealing ring according to any one of claims 1-9, characterized in that, The method includes the following steps: S1, after mixing the raw materials of the anti-vibration super-silent bearing sealing ring, reacting at 70-85℃ for 3-5h; S2, heating to 120-140℃ for 20-50min, and then vulcanizing at 100-115℃ for 2-8h, and cooling and shaping to obtain the anti-vibration super-silent bearing sealing ring.