阅读说明：本技术 一种高温耐磨密封圈及其制备方法 (High-temperature wear-resistant sealing ring and preparation method thereof ) 是由 倪立伟 徐健 于 2019-11-27 设计创作，主要内容包括：本发明公开了一种高温耐磨密封圈及其制备方法,涉及密封圈技术领域,解决了因密封圈在高温环境中的耐磨损性能较差,而导致其整体应用效果不佳的问题。一种高温耐磨密封圈,其包括如下重量份数的组分：丁腈橡胶70-90份；三元乙丙橡胶10-30份；硫磺3-8份；硬脂酸1-3份；聚二甲基硅氧烷0.6-1.2份；碳纤维2-5份；增强填料15-20份；增塑剂2-3份；防老剂1-5份；促进剂0.5-1份；聚四氟乙烯3-6份；氟硅树脂10-15份；纳米氧化铝陶瓷短纤维5-9份。本发明中的高温耐磨密封圈不仅具有良好的耐高温性能,还在高温环境中具有良好的耐磨损性能,且整体应用效果好。(The invention discloses a high-temperature wear-resistant sealing ring and a preparation method thereof, relates to the technical field of sealing rings, and solves the problem that the whole application effect of the sealing ring is poor due to poor wear resistance in a high-temperature environment. A high-temperature wear-resistant sealing ring comprises the following components in parts by weight: 70-90 parts of nitrile rubber; 10-30 parts of ethylene propylene diene monomer; 3-8 parts of sulfur; 1-3 parts of stearic acid; 0.6-1.2 parts of polydimethylsiloxane; 2-5 parts of carbon fiber; 15-20 parts of reinforcing filler; 2-3 parts of a plasticizer; 1-5 parts of an anti-aging agent; 0.5-1 part of an accelerator; 3-6 parts of polytetrafluoroethylene; 10-15 parts of fluorosilicone resin; 5-9 parts of nano alumina ceramic short fiber. The high-temperature wear-resistant sealing ring disclosed by the invention not only has good high-temperature resistance, but also has good wear resistance in a high-temperature environment, and the whole application effect is good.)

1. The high-temperature wear-resistant sealing ring is characterized by comprising the following components in parts by weight:

70-90 parts of nitrile rubber;

10-30 parts of ethylene propylene diene monomer;

3-8 parts of sulfur;

1-3 parts of stearic acid;

0.6-1.2 parts of polydimethylsiloxane;

2-5 parts of carbon fiber;

15-20 parts of reinforcing filler;

2-3 parts of a plasticizer;

1-5 parts of an anti-aging agent;

0.5-1 part of an accelerator;

3-6 parts of polytetrafluoroethylene;

10-15 parts of fluorosilicone resin;

5-9 parts of nano alumina ceramic short fiber.

2. The high-temperature wear-resistant sealing ring as claimed in claim 1, wherein 2-4 parts by weight of functional additives are added into the components of the high-temperature wear-resistant sealing ring, the functional additives are a mixture of bi-isopropyl boroxine polycarbonate short fibers and high styrene, and the weight part ratio of the bi-isopropyl boroxine polycarbonate short fibers to the high styrene is 1 (2-3).

3. The high-temperature wear-resistant sealing ring according to claim 1, wherein 3-5 parts by weight of a reinforcing aid is further added to the components of the high-temperature wear-resistant sealing ring, the reinforcing aid is a mixture of silicon nitride and chlorosulfonated polyethylene, and the weight part ratio of the silicon nitride to the chlorosulfonated polyethylene is (1-3): 1.

4. The high-temperature wear-resistant sealing ring according to claim 1, wherein the reinforcing filler is selected from any one of bentonite, white carbon black and carbon black.

5. A high temperature wear resistant seal ring according to claim 1, wherein said plasticizer is selected from any one of paraffin wax, dimethyl phthalate and dioctyl phthalate.

6. The high-temperature wear-resistant sealing ring according to claim 1, wherein the anti-aging agent is any one of N-phenyl- α -aniline, N-phenyl- β -naphthylamine and p-phenylenediamine.

7. The high-temperature wear-resistant sealing ring according to claim 1, wherein the accelerator is any one of triethanolamine, dibutyltin dilaurate and N, N-dimethyl-p-methylaniline.

8. A method for preparing a high-temperature wear-resistant sealing ring according to claim 1, characterized by comprising the following steps:

step one, rubber mixing treatment: crushing nitrile rubber and ethylene propylene diene monomer rubber in corresponding weight parts, and placing the crushed nitrile rubber and ethylene propylene diene monomer rubber into a rubber mixing mill for mixing rubber for 10-30min at the temperature of 130-;

step two, modification and mixing: continuously adding fluorosilicone resin, nano alumina ceramic short fibers and carbon fibers in corresponding weight parts into a rubber mixing mill, and uniformly mixing for 15-25min while maintaining the original temperature;

step three, preparing premix: then adding corresponding parts by weight of sulfur, stearic acid, polydimethylsiloxane, reinforcing filler, plasticizer, anti-aging agent and accelerator, and continuously mixing uniformly for 20-30min to obtain a premix;

step four, vulcanization molding: adding the premix into a mold of a vulcanizing device for vulcanization to obtain a blank, vulcanizing polytetrafluoroethylene with corresponding parts by weight on the surface of the blank at the vulcanization temperature of 190-.

Technical Field

The invention relates to the technical field of sealing rings, in particular to a high-temperature wear-resistant sealing ring and a preparation method thereof.

Background

The nitrile rubber sealing ring is suitable for being used in media such as petroleum hydraulic oil, glycol hydraulic oil, diester lubricating oil, gasoline, water, silicon lubricating grease, silicon oil and the like. The rubber sealing element has the widest application and the lowest cost at present.

The invention discloses a nitrile rubber/ethylene propylene diene monomer rubber for an ozone-resistant low-temperature-resistant sealing ring in a Chinese patent with the publication number of CN102260380A, wherein the rubber material comprises the following components: nitrile butadiene rubber, ethylene propylene diene monomer rubber, a compatibilizer CPE, an anti-aging agent MB, stearic acid, paraffin, a plasticizer DOP, carbon black N550, pottery clay, a coupling agent KH-550, high styrene, a neutralizer TRA, a crosslinking agent DCP, an auxiliary crosslinking agent TMPTMA and an auxiliary crosslinking agent TAIC. The nitrile rubber (NBR) and the Ethylene Propylene Diene Monomer (EPDM) are used together, so that the nitrile rubber and the EPDM can make up for the shortages, the poor ozone resistance and the poor low temperature resistance of the nitrile rubber can be improved, the heat-resistant temperature range is narrow, and the service temperature range of the product can be increased.

In the above application documents, after a small amount of EPDM is added to nitrile rubber, the ozone resistance and low temperature resistance of the blended rubber product can be improved, and the heat resistance has a wider application temperature range, better process performance, lower raw material and production cost than both nitrile rubber and chloroprene rubber, but the overall wear resistance is poor, and particularly in an environment with a higher temperature, greater wear is likely to occur, and the overall application effect is poor. Therefore, a new solution is needed to solve the above problems.

Disclosure of Invention

Aiming at the problem that the whole application effect of a sealing ring is poor due to poor wear resistance in a high-temperature environment in the prior art, the invention aims to provide the high-temperature wear-resistant sealing ring to solve the technical problem, and the sealing ring not only has good high-temperature resistance, but also has good wear resistance in the high-temperature environment and good whole application effect.

In order to achieve the first purpose, the invention provides the following technical scheme:

a high-temperature wear-resistant sealing ring comprises the following components in parts by weight:

70-90 parts of nitrile rubber;

10-30 parts of ethylene propylene diene monomer;

3-8 parts of sulfur;

1-3 parts of stearic acid;

0.6-1.2 parts of polydimethylsiloxane;

2-5 parts of carbon fiber;

15-20 parts of reinforcing filler;

2-3 parts of a plasticizer;

1-5 parts of an anti-aging agent;

0.5-1 part of an accelerator;

3-6 parts of polytetrafluoroethylene;

10-15 parts of fluorosilicone resin;

5-9 parts of nano alumina ceramic short fiber.

By adopting the technical scheme, the nitrile rubber is synthetic rubber with better oil resistance, wear resistance and aging resistance, has good processing performance and is a main component of the high-temperature wear-resistant sealing ring. And the relative density of the acrylonitrile butadiene rubber is increased along with the content of the acrylonitrile butadiene in the nitrile butadiene rubber structure, the vulcanization speed is accelerated, the tensile strength performance is improved, but the resilience performance is reduced, and the cold resistance is poor. The ethylene propylene diene monomer rubber has excellent ozone resistance, heat resistance, weather resistance and other aging resistance, and can play a good complementary role with the nitrile rubber, so that the high-temperature wear-resistant sealing ring has good and stable quality. The sulfur is a good vulcanizer and can ensure that the high-temperature wear-resistant sealing ring has good mechanical property. Stearic acid is a good active agent, which can reduce the dosage of the accelerant and balance various performances of the high-temperature wear-resistant sealing ring. The carbon fiber has good high-temperature resistance, is a good reinforcing material, and can keep the high-temperature wear-resistant sealing ring in good and stable high-temperature resistance.

In production or in-service use process, because the stirring makes the inside of high temperature wear-resisting sealing washer form the microbubble, and in the forming process, the inside microbubble takes place to migrate easily and gathers and form great bubble together, and the foam can be fine got rid of to polydimethylsiloxane, and then can guarantee the whole quality of high temperature wear-resisting sealing washer. The fluorine-silicon resin has excellent temperature resistance, anti-adhesion property and chemical resistance, the nano alumina ceramic short fiber has good structural strength and wear resistance, the temperature of the wear surface of the high-temperature wear-resistant sealing ring can be reduced, the continuous wear can be effectively prevented, and the nano alumina ceramic short fiber and the fluorine-silicon resin can play a good combined compounding effect.

More preferably, the high-temperature wear-resistant sealing ring is further added with 2-4 parts by weight of functional auxiliary agent, the functional auxiliary agent is a mixture of double isopropyl boron oxygen alkane polycarbonate short fiber and high styrene, and the weight part ratio of the double isopropyl boron oxygen alkane polycarbonate short fiber to the high styrene is 1 (2-3).

By adopting the technical scheme, the double isopropyl boron oxygen alkane polycarbonate short fibers can greatly improve the wear resistance of the high-temperature wear-resistant sealing ring, and the whole stability of the high-temperature wear-resistant sealing ring is poor, so that high styrene is added to form the functional assistant, the excellent heat resistance and compatibility of the high styrene are utilized, the double isopropyl boron oxygen alkane polycarbonate short fibers can completely and effectively act on the high-temperature wear-resistant sealing ring, the high-temperature wear-resistant sealing ring can also have higher structural strength, and the whole quality of the high-temperature wear-resistant sealing ring is greatly improved.

More preferably, 3-5 parts by weight of a reinforcing aid is added into the components of the high-temperature wear-resistant sealing ring, the reinforcing aid is a mixture of silicon nitride and chlorosulfonated polyethylene, and the weight part ratio of the silicon nitride to the chlorosulfonated polyethylene is (1-3): 1.

Through adopting above-mentioned technical scheme, silicon nitride is a good structural ceramic material, and itself has good wear resistance, has good resistance to cold and hot impact, and in high temperature environment, takes place physical bonding easily between the chlorosulfonyl in the chlorosulfonated polyethylene and the active group on silicon nitride surface, not only makes difficult the emergence reunion between the silicon nitride, can also improve high temperature wear-resisting sealing washer stability in high temperature environment greatly, and whole wear resistance improves greatly.

More preferably, the reinforcing filler is any one of bentonite, white carbon black and carbon black.

By adopting the technical scheme, the bentonite, the white carbon black and the carbon black are good reinforcing fillers, the high-temperature wear-resistant sealing ring has good dispersibility and filling property, the bonding strength among all components in the high-temperature wear-resistant sealing ring can be greatly improved, the high-temperature wear-resistant sealing ring can have good and stable structural strength and wear resistance, and the overall quality is greatly improved.

More preferably, the plasticizer is any one of paraffin, dimethyl phthalate and dioctyl phthalate.

By adopting the technical scheme, the plasticizer has good compatibility with raw materials of all components, the secondary bond between resin molecules can be weakened, the mobility of the resin molecular bond is increased, the crystallinity of the resin molecules is reduced, the plasticity of the resin molecules is increased, the flexibility and the ductility of the resin molecules are enhanced, the processing is easy, and the high-temperature wear-resistant sealing ring has good plastic strength.

More preferably, the anti-aging agent is any one of N-phenyl- α -aniline, N-phenyl- β -naphthylamine and p-phenylenediamine.

By adopting the technical scheme, the aging inhibitor can delay the aging of the high-temperature wear-resistant sealing ring, and the N-phenyl- α -aniline, the N-phenyl- β -naphthylamine and the p-phenylenediamine are all good in anti-aging effect, so that the resistance of the high-temperature wear-resistant sealing ring to the external damage can be weakened or reduced, the aging process can be delayed or inhibited, and the storage period and the service life of the high-temperature wear-resistant sealing ring can be prolonged.

More preferably, the accelerator is any one of triethanolamine, dibutyltin dilaurate and N, N-dimethyl-p-methylaniline.

By adopting the technical scheme, the accelerator can accelerate the vulcanization speed of rubber, reduce the vulcanization temperature, shorten the vulcanization time and reduce the consumption of sulfur, so that the high-temperature wear-resistant sealing ring can keep good structural strength and wear resistance, the production cost is reduced, and the environment-friendly production is realized.

The second purpose of the invention is to provide a preparation method of the high-temperature wear-resistant sealing ring, and the high-temperature wear-resistant sealing ring prepared by the method has good high-temperature resistance, good wear resistance in a high-temperature environment and good overall application effect.

In order to achieve the second purpose, the invention provides the following technical scheme, which comprises the following steps:

step one, rubber mixing treatment: crushing nitrile rubber and ethylene propylene diene monomer rubber in corresponding weight parts, and placing the crushed nitrile rubber and ethylene propylene diene monomer rubber into a rubber mixing mill for mixing rubber for 10-30min at the temperature of 130-;

step two, modification and mixing: continuously adding fluorosilicone resin, nano alumina ceramic short fibers and carbon fibers in corresponding weight parts into a rubber mixing mill, and uniformly mixing for 15-25min while maintaining the original temperature;

step three, preparing premix: then adding corresponding parts by weight of sulfur, stearic acid, polydimethylsiloxane, reinforcing filler, plasticizer, anti-aging agent and accelerator, and continuously mixing uniformly for 20-30min to obtain a premix;

step four, vulcanization molding: adding the premix into a mold of a vulcanizing device for vulcanization to obtain a blank, vulcanizing polytetrafluoroethylene with corresponding parts by weight on the surface of the blank at the vulcanization temperature of 190-.

By adopting the technical scheme, after the nitrile rubber and the ethylene propylene diene monomer are mixed, the fluorosilicone resin, the nano alumina ceramic short fibers and the carbon fibers are added firstly, so that the fluorosilicone resin, the nano alumina ceramic short fibers and the carbon fibers can fully interact with each other to form a stable base material, then other raw materials are added, a premix is obtained after uniform mixing, and the high-temperature wear-resistant sealing ring with good and stable quality is obtained after vulcanization molding. Meanwhile, the process is simple to operate, high in production efficiency, free of great pollution to the environment and good in applicability in the actual use process.

In summary, compared with the prior art, the invention has the following beneficial effects:

(1) the fluorine-silicon resin has excellent temperature resistance, anti-adhesion property and chemical resistance, the nano alumina ceramic short fiber has good structural strength and wear resistance, and the nano alumina ceramic short fiber is easy to bond with fluorine in the fluorine-silicon resin due to the fact that the nano alumina ceramic short fiber has the defects of the pair of surface atomic numbers and serious coordination, and forms a mutually penetrated network structure in the high-temperature wear-resistant sealing ring while exerting the good characteristics of the nano alumina ceramic short fiber, so that the wear resistance of the high-temperature wear-resistant sealing ring can be greatly improved;

(2) the functional assistant which is formed by mixing the double isopropyl boron oxygen alkane polycarbonate short fiber and the high styrene is added, so that the wear resistance of the high-temperature wear-resistant sealing ring is greatly improved, the stability of the whole high-temperature wear-resistant sealing ring is greatly improved, the structural strength is higher, and the whole quality is greatly improved;

(3) the reinforcing additive formed by mixing silicon nitride and chlorosulfonated polyethylene is added, so that the high-temperature wear-resistant sealing ring has good resistance to cold and hot impact, and the overall wear resistance of the high-temperature wear-resistant sealing ring is greatly improved in a high-temperature environment.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

The invention is described in detail below with reference to the figures and examples.