O-shaped ring rubber compound and preparation method thereof

Abstract

The invention discloses an O-shaped ring rubber compound and a preparation method thereof, the O-shaped ring rubber compound comprises a rubber base material, a filler, a plasticizer and an auxiliary agent, the rubber base material is specifically nitrile rubber, and the auxiliary agent is specifically a vulcanizing agent, an accelerant and an anti-aging agent. The fly ash is used for replacing part of carbon black to serve as the filler of the O-shaped ring rubber compound, the production cost of the O-shaped ring rubber compound is reduced under the condition that the performance of the O-shaped ring rubber compound is not affected, waste recycling can be achieved through the fly ash, landfill of solid waste is reduced, the environmental requirement for sustainable development is met, and the method is suitable for industrial production. The fly ash can improve the processability of a rubber compound and increase the flowability and processability of a rubber material, fine particles of the fly ash can improve the wear resistance and toughness of the O-shaped ring, the fly ash has good thermal stability, and after part of carbon black is replaced by the fly ash, the performance of the O-shaped ring in a high-temperature environment can be improved, and the service life of the O-shaped ring is prolonged. The uniform distribution of the fly ash can promote the compactness of the rubber and indirectly enhance the sealing performance of the O-shaped ring.

Description

Technical Field

[0001] This invention relates to the field of O-ring compound technology, specifically to an O-ring compound and its preparation method. Background Technology

[0002] O-ring compound is a special rubber compound used to manufacture O-rings. Its main characteristics are good elasticity, wear resistance, corrosion resistance and high temperature resistance.

[0003] Chinese invention patent CN116082721A discloses a compound for O-rings used in automotive motors and its preparation method. The compound comprises the following components by weight percentage: 46-56% nitrile butadiene rubber and its alloys, 12-23% reinforcing agent, 9-19% filler, 2-12% plasticizer, 2-10% other compounding agents, and 2-8% vulcanization accelerator. This invention uses a combination of NBR / PVC alloy and NBR, with the addition of special friction-reducing materials, exhibiting good wear resistance and tear resistance, excellent bench fatigue life, and good processability and physical and mechanical properties. The O-ring compound materials mentioned in the above patents typically use carbon black as a filler. However, the production of carbon black is directly related to petroleum, and the production of high-quality carbon black often depends on petroleum products. In the compound formulation, the amount of carbon black used is relatively large, making the cost of preparing O-ring compound too high. Summary of the Invention

[0004] The purpose of this invention is to provide an O-ring compound and its preparation method, which solves the problem that existing O-ring compound materials usually use carbon black as a filler, but the production of carbon black is directly related to petroleum, especially the production of high-quality carbon black often depends on petroleum products. In the compound formulation, the amount of carbon black used is large, and the cost of preparing O-ring compound is too high.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution: an O-ring compound comprising a rubber base material, fillers, plasticizers and additives.

[0006] Preferably, the rubber substrate is nitrile rubber, and the additives are vulcanizing agents, accelerators, and antioxidants.

[0007] Preferably, the filler is carbon black, the nitrile rubber accounts for 60% to 80% by weight, the carbon black accounts for 20% to 40% by weight, the plasticizer accounts for 5% to 15% by weight, the vulcanizing agent accounts for 1% to 3% by weight, the accelerator accounts for 0.5% to 2% by weight, and the antioxidant accounts for 0.5% to 2% by weight.

[0008] Preferably, the filler is fly ash, the nitrile rubber accounts for 60% to 80% by weight, the fly ash accounts for 20% to 40% by weight, the plasticizer accounts for 5% to 15% by weight, the vulcanizing agent accounts for 1% to 3% by weight, the accelerator accounts for 0.5% to 2% by weight, and the antioxidant accounts for 0.5% to 2% by weight.

[0009] Preferably, the filler is a mixture of carbon black and fly ash, wherein the nitrile rubber accounts for 60% to 80% by weight, the carbon black accounts for 10% to 30% by weight, the fly ash accounts for 10% to 30% by weight, the plasticizer accounts for 5% to 15% by weight, the vulcanizing agent accounts for 1% to 3% by weight, the accelerator accounts for 0.5% to 2% by weight, and the antioxidant accounts for 0.5% to 2% by weight.

[0010] A method for preparing an O-ring compound includes the following steps: Step S1: Raw material preparation: Prepare the required nitrile rubber, carbon black, plasticizer, vulcanizing agent, accelerator and antioxidant according to the weight ratio; Step S2, Mixing: In a mixing mill, nitrile rubber, carbon black, plasticizer, vulcanizing agent, accelerator and antioxidant are mixed in proportion to ensure that each component is evenly dispersed; Step S3, Molding and Vulcanization: The compounded rubber is pre-formed into the shape of an O-ring, heated and pressurized in a vulcanizing machine to cross-link the rubber and form the final product; Step S4, Post-processing: Remove the vulcanized O-rings from the vulcanizing machine, let them cool to room temperature, and then trim, inspect, and package them.

[0011] Preferably, a method for preparing an O-ring compound includes the following steps: Step V1, Raw material preparation: Prepare the required nitrile rubber, fly ash, plasticizer, vulcanizing agent, accelerator and antioxidant according to the weight ratio; Step V2, Mixing: In a mixing mill, nitrile rubber, fly ash, plasticizer, vulcanizing agent, accelerator and antioxidant are mixed in proportion to ensure that each component is evenly dispersed; Step V3, Molding and Vulcanization: The compounded rubber is pre-formed into the shape of an O-ring, heated and pressurized in a vulcanizing machine to cross-link the rubber and form the final product; Step V4, Post-processing: Remove the vulcanized O-rings from the vulcanizing machine, allow them to cool to room temperature, and then trim, inspect, and package them.

[0012] Preferably, a method for preparing an O-ring compound includes the following steps: Step N1, Raw material preparation: Prepare the required nitrile rubber, carbon black, fly ash, plasticizer, vulcanizing agent, accelerator and antioxidant according to the weight ratio; Step N2, Mixing: In a mixing mill, nitrile rubber, carbon black, fly ash, plasticizer, vulcanizing agent, accelerator and antioxidant are mixed in proportion to ensure that each component is evenly dispersed; Step N3, Molding and Vulcanization: The compounded rubber is pre-formed into the shape of an O-ring, heated and pressurized in a vulcanizing machine to cross-link the rubber and form the final product; Step N4, Post-processing: Remove the vulcanized O-rings from the vulcanizing machine, allow them to cool to room temperature, and then trim, inspect, and package them.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention uses fly ash to replace part of the carbon black as a filler in O-ring compound, reducing the production cost of O-ring compound without affecting its performance. Simultaneously, the use of fly ash enables waste recycling, reducing solid waste landfill and meeting the environmental requirements of sustainable development. Fly ash improves the processing performance of the compound, increasing its flowability and processability. The fine particles of fly ash improve the wear resistance and toughness of the O-ring. Fly ash has good thermal stability; replacing part of the carbon black may improve the performance of the O-ring at high temperatures. The uniform distribution of fly ash promotes the compactness of the rubber, indirectly enhancing the sealing performance of the O-ring. Detailed Implementation

[0014] The above-mentioned and other technical features and advantages of the present invention will be described in more detail.

[0015] An O-ring compound includes a rubber base material, fillers, plasticizers, and additives. The rubber base material is specifically nitrile rubber, and the additives are specifically vulcanizing agents, accelerators, and antioxidants.

[0016] Furthermore, the filler is specifically carbon black, with nitrile rubber accounting for 60%~80% by weight, carbon black accounting for 20%~40% by weight, plasticizer accounting for 5%~15% by weight, vulcanizing agent accounting for 1%~3% by weight, accelerator accounting for 0.5%~2% by weight, and antioxidant accounting for 0.5%~2% by weight.

[0017] Furthermore, the filler is specifically fly ash, with nitrile rubber accounting for 60%~80% by weight, fly ash accounting for 20%~40% by weight, plasticizer accounting for 5%~15% by weight, vulcanizing agent accounting for 1%~3% by weight, accelerator accounting for 0.5%~2% by weight, and antioxidant accounting for 0.5%~2% by weight.

[0018] Furthermore, the filler is specifically a mixture of carbon black and fly ash, with nitrile rubber accounting for 60%~80% by weight, carbon black accounting for 10%~30% by weight, fly ash accounting for 10%~30% by weight, plasticizer accounting for 5%~15% by weight, vulcanizing agent accounting for 1%~3% by weight, accelerator accounting for 0.5%~2% by weight, and antioxidant accounting for 0.5%~2% by weight. Example 1

[0019] This embodiment provides a technical solution: an O-ring compound, comprising nitrile rubber, carbon black, plasticizer, vulcanizing agent, accelerator and antioxidant, wherein 600g of nitrile rubber, 300g of carbon black, 50g of plasticizer, 20g of vulcanizing agent, 10g of accelerator and 10g of antioxidant; The preparation is carried out through the following steps: Step S1: Raw material preparation: Prepare the required nitrile rubber, carbon black, plasticizer, vulcanizing agent, accelerator and antioxidant according to the weight ratio; Step S2, Mixing: In a mixing machine, mix 600g of nitrile rubber, 300g of carbon black, 50g of plasticizer, 20g of vulcanizing agent, 10g of accelerator and 10g of antioxidant in proportion to ensure that each component is evenly dispersed. Step S3, Molding and Vulcanization: The compounded rubber is pre-formed into the shape of an O-ring, heated and pressurized in a vulcanizing machine to cross-link the rubber and form the final product; Step S4, Post-processing: Remove the vulcanized O-rings from the vulcanizing machine, let them cool to room temperature, and then trim, inspect, and package them. Example 2

[0020] This embodiment provides a technical solution: an O-ring compound, comprising nitrile rubber, fly ash, plasticizer, vulcanizing agent, accelerator and antioxidant, wherein 600g of nitrile rubber, 300g of fly ash, 50g of plasticizer, 20g of vulcanizing agent, 10g of accelerator and 10g of antioxidant; The preparation is carried out through the following steps: Step V1, Raw material preparation: Prepare the required nitrile rubber, fly ash, plasticizer, vulcanizing agent, accelerator and antioxidant according to the weight ratio; Step V2, Mixing: In a mixing mill, mix 600g of nitrile rubber, 300g of fly ash, 50g of plasticizer, 20g of vulcanizing agent, 10g of accelerator and 10g of antioxidant in proportion to ensure that each component is evenly dispersed. Step V3, Molding and Vulcanization: The compounded rubber is pre-formed into the shape of an O-ring, heated and pressurized in a vulcanizing machine to cross-link the rubber and form the final product; Step V4, Post-processing: Remove the vulcanized O-rings from the vulcanizing machine, allow them to cool to room temperature, and then trim, inspect, and package them. Example 3

[0021] This embodiment provides a technical solution: an O-ring compound, comprising nitrile rubber, carbon black, fly ash, plasticizer, vulcanizing agent, accelerator and antioxidant, wherein 600g of nitrile rubber, 200g of carbon black, 100g of fly ash, 50g of plasticizer, 20g of vulcanizing agent, 10g of accelerator and 10g of antioxidant; The preparation is carried out through the following steps: Step N1, Raw material preparation: Prepare the required nitrile rubber, carbon black, fly ash, plasticizer, vulcanizing agent, accelerator and antioxidant according to the weight ratio; Step N2, Mixing: In a mixing mill, mix 600g of nitrile rubber, 200g of carbon black, 100g of fly ash, 50g of plasticizer, 20g of vulcanizing agent, 10g of accelerator and 10g of antioxidant in proportion to ensure that each component is evenly dispersed. Step N3, Molding and Vulcanization: The compounded rubber is pre-formed into the shape of an O-ring, heated and pressurized in a vulcanizing machine to cross-link the rubber and form the final product; Step N4, Post-processing: Remove the vulcanized O-rings from the vulcanizing machine, allow them to cool to room temperature, and then trim, inspect, and package them. Example 4

[0022] This embodiment provides a technical solution: an O-ring compound, comprising nitrile rubber, carbon black, fly ash, plasticizer, vulcanizing agent, accelerator and antioxidant, wherein 600g of nitrile rubber, 150g of carbon black, 150g of fly ash, 50g of plasticizer, 20g of vulcanizing agent, 10g of accelerator and 10g of antioxidant; The preparation is carried out through the following steps: Step N1, Raw material preparation: Prepare the required nitrile rubber, carbon black, fly ash, plasticizer, vulcanizing agent, accelerator and antioxidant according to the weight ratio; Step N2, Mixing: In a mixing machine, mix 600g of nitrile rubber, 150g of carbon black, 150g of fly ash, 50g of plasticizer, 20g of vulcanizing agent, 10g of accelerator and 10g of antioxidant in proportion to ensure that each component is evenly dispersed. Step N3, Molding and Vulcanization: The compounded rubber is pre-formed into the shape of an O-ring, heated and pressurized in a vulcanizing machine to cross-link the rubber and form the final product; Step N4, Post-processing: Remove the vulcanized O-rings from the vulcanizing machine, allow them to cool to room temperature, and then trim, inspect, and package them. Example 5

[0023] This embodiment provides a technical solution: an O-ring compound, comprising nitrile rubber, carbon black, fly ash, plasticizer, vulcanizing agent, accelerator and antioxidant, wherein 600g of nitrile rubber, 100g of carbon black, 200g of fly ash, 50g of plasticizer, 20g of vulcanizing agent, 10g of accelerator and 10g of antioxidant; The preparation is carried out through the following steps: Step N1, Raw material preparation: Prepare the required nitrile rubber, carbon black, fly ash, plasticizer, vulcanizing agent, accelerator and antioxidant according to the weight ratio; Step N2, Mixing: In a mixing machine, mix 600g of nitrile rubber, 100g of carbon black, 200g of fly ash, 50g of plasticizer, 20g of vulcanizing agent, 10g of accelerator and 10g of antioxidant in proportion to ensure that each component is evenly dispersed. Step N3, Molding and Vulcanization: The compounded rubber is pre-formed into the shape of an O-ring, heated and pressurized in a vulcanizing machine to cross-link the rubber and form the final product; Step N4, Post-processing: Remove the vulcanized O-rings from the vulcanizing machine, allow them to cool to room temperature, and then trim, inspect, and package them.

[0024] Equal amounts of the O-ring compound obtained in Example 1, Example 2, Example 3, Example 4, and Example 5 were used in operation, and their tensile strength, elongation at break, hardness, abrasion resistance, oil resistance, and temperature stability were tested, and the results are shown in the table below: Tensile strength: Tested according to GB / T 528-2009 standard.

[0025] Elongation at break: Tested according to GB / T 528-2009 standard.

[0026] Hardness: Tested according to GB / T 531.1-2008 standard.

[0027] Abrasion resistance: Tested according to GB / T 1689-2014 standard (Akron abrasion method).

[0028] Oil resistance: The sample was immersed in IRM 903 oil (70℃×24h) and the volume change rate was tested.

[0029] Temperature stability: Compression set was tested according to GB / T 7759-2015 standard (70℃×24h).

[0030] Table 1 Properties of O-ring Compound

[0031] By comparing the properties of the O-ring compound in Example 1, Example 2, Example 3, Example 4, and Example 5 in Table 1, it can be seen that... The O-ring compound in Example 1 exhibits the best performance, with good tensile strength, elongation at break, abrasion resistance, and oil resistance, making it suitable for high-performance O-rings. The O-ring compound of Example 2 showed a significant decrease in performance, especially in tensile strength and abrasion resistance. It had the lowest cost and was suitable for applications with low performance requirements. The O-ring compound of Example 3 has properties similar to those of Example 1, but at a lower cost, achieving a good balance between performance and cost. The O-ring compound of Example 4 has slightly lower performance than that of Example 3, but the cost is further reduced, making it suitable for O-rings with medium performance requirements. The O-ring compound of Example 5 has similar performance to that of Example 2. Because it uses more fly ash to replace carbon black, it is suitable for low-cost, medium-performance applications. It can be concluded that fly ash can replace part of the carbon black. The ratio in Example 3 is the best, achieving the best balance between performance and cost, and is suitable for most application scenarios. Other examples can be selected according to the application scenario. If there is too little data, more sets can be made.

[0032] By using fly ash to replace part of the carbon black as a filler in O-ring compound, the production cost of O-ring compound can be reduced without affecting its performance. Simultaneously, the use of fly ash enables waste recycling, reducing solid waste landfill and meeting the environmental requirements of sustainable development. Fly ash can improve the processing performance of the compound, increasing its flowability and processability. The fine particles of fly ash can improve the wear resistance and toughness of the O-ring. Fly ash has good thermal stability; after replacing part of the carbon black, the performance of the O-ring may be improved under high-temperature conditions. The uniform distribution of fly ash can promote the compactness of the rubber, indirectly enhancing the sealing performance of the O-ring.

[0033] A preferred technical solution is to add silica as a filler to improve the performance of O-ring compound.

[0034] A preferred technical solution is to replace silica with cement industry waste. For example, gypsum powder or cement precipitates, after proper treatment, can be used as fillers, saving costs and achieving recycling.

[0035] A preferred technical solution is to use recycled rubber to replace nitrile rubber, such as waste tires or waste rubber products, to process and reconstitute a mixture of nitrile rubber. The recycled rubber needs to be cleaned, crushed and processed, which can effectively reduce the cost of raw materials.

[0036] The above are merely preferred embodiments of the present invention and are illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. An O-ring compound, characterized in that, It includes rubber base material, fillers, plasticizers, and additives.

2. The O-ring compound as described in claim 1, characterized in that, The rubber substrate is specifically nitrile rubber, and the additives are specifically vulcanizing agents, accelerators, and antioxidants.

3. The O-ring compound as described in claim 2, characterized in that, The filler is specifically carbon black, the nitrile rubber accounts for 60% to 80% by weight, the carbon black accounts for 20% to 40% by weight, the plasticizer accounts for 5% to 15% by weight, the vulcanizing agent accounts for 1% to 3% by weight, the accelerator accounts for 0.5% to 2% by weight, and the antioxidant accounts for 0.5% to 2% by weight.

4. The O-ring compound as described in claim 2, characterized in that, The filler is specifically fly ash, the nitrile rubber accounts for 60% to 80% by weight, the fly ash accounts for 20% to 40% by weight, the plasticizer accounts for 5% to 15% by weight, the vulcanizing agent accounts for 1% to 3% by weight, the accelerator accounts for 0.5% to 2% by weight, and the antioxidant accounts for 0.5% to 2% by weight.

5. The O-ring compound as described in claim 2, characterized in that, The filler is specifically a mixture of carbon black and fly ash, wherein the nitrile rubber accounts for 60% to 80% by weight, the carbon black accounts for 10% to 30% by weight, the fly ash accounts for 10% to 30% by weight, the plasticizer accounts for 5% to 15% by weight, the vulcanizing agent accounts for 1% to 3% by weight, the accelerator accounts for 0.5% to 2% by weight, and the antioxidant accounts for 0.5% to 2% by weight.

6. A method for preparing an O-ring compound, characterized in that, The preparation method, when applied to the O-ring compound as described in claim 3, includes the following steps: Step S1: Raw material preparation: Prepare the required nitrile rubber, carbon black, plasticizer, vulcanizing agent, accelerator and antioxidant according to the weight ratio; Step S2, Mixing: In a mixing mill, nitrile rubber, carbon black, plasticizer, vulcanizing agent, accelerator and antioxidant are mixed in proportion to ensure that each component is evenly dispersed; Step S3, Molding and Vulcanization: The compounded rubber is pre-formed into the shape of an O-ring, heated and pressurized in a vulcanizing machine to cross-link the rubber and form the final product; Step S4, Post-processing: Remove the vulcanized O-rings from the vulcanizing machine, let them cool to room temperature, and then trim, inspect, and package them.

7. A method for preparing an O-ring compound, characterized in that, The preparation method, when applied to the O-ring compound as described in claim 4, includes the following steps: Step V1, Raw material preparation: Prepare the required nitrile rubber, fly ash, plasticizer, vulcanizing agent, accelerator and antioxidant according to the weight ratio; Step V2, Mixing: In a mixing mill, nitrile rubber, fly ash, plasticizer, vulcanizing agent, accelerator and antioxidant are mixed in proportion to ensure that each component is evenly dispersed; Step V3, Molding and Vulcanization: The compounded rubber is pre-formed into the shape of an O-ring, heated and pressurized in a vulcanizing machine to cross-link the rubber and form the final product; Step V4, Post-processing: Remove the vulcanized O-rings from the vulcanizing machine, allow them to cool to room temperature, and then trim, inspect, and package them.

8. A method for preparing an O-ring compound, characterized in that, The preparation method, applied to the O-ring compound as described in claim 5, includes the following steps: Step N1, Raw material preparation: Prepare the required nitrile rubber, carbon black, fly ash, plasticizer, vulcanizing agent, accelerator and antioxidant according to the weight ratio; Step N2, Mixing: In a mixing mill, nitrile rubber, carbon black, fly ash, plasticizer, vulcanizing agent, accelerator and antioxidant are mixed in proportion to ensure that each component is evenly dispersed; Step N3, Molding and Vulcanization: The compounded rubber is pre-formed into the shape of an O-ring, heated and pressurized in a vulcanizing machine to cross-link the rubber and form the final product; Step N4, Post-processing: Remove the vulcanized O-rings from the vulcanizing machine, allow them to cool to room temperature, and then trim, inspect, and package them.

Images