High-performance rubber material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of rubber, and discloses a high-performance rubber material as well as a preparation method and application thereof. The high-performance rubber material comprises the following components in parts by weight: 100 parts of raw rubber; 0.2 to 2 parts of vulcanizing agent; 1-3 parts of an accelerant; 30 to 80 parts of a reinforcing agent; 1-3 parts of an anti-aging agent; 15-20 parts of a plasticizer; 1-3 parts of an auxiliary agent; and 5-10 parts of a filling agent. The raw rubber is formed by mixing NBR (nitrile butadiene rubber) and SBR (styrene butadiene rubber) according to a weight ratio of (70: 30)-(90: 10). In view of respective performance characteristics of the SBR and the NBR, the advantages of the SBR and the NBR are combined, the rubber materials with different performances are obtained by changing the blending proportion, the rubber material with more comprehensive performances and wider application range is developed, and various different application requirements can be met.

Description

Technical Field

[0001] This application relates to the technical field of rubber, and more specifically, it relates to a high-performance rubber material, its preparation method, and its application. Background Art

[0002] In the modern industrial field, rubber materials are widely used in many key fields such as automobile manufacturing, aerospace, wire and cable, and industrial sealing due to their unique elasticity and chemical corrosion resistance. Among them, styrene-butadiene rubber (SBR) and nitrile-butadiene rubber (NBR), as two common industrial synthetic rubbers, each have unique performance advantages.

[0003] SBR has good elasticity, cold resistance, and processing performance. This rubber material can still maintain excellent flexibility at low temperatures, is not easy to crack, and is easy to carry out processing processes such as mixing, calendering, extruding, and vulcanization. Therefore, SBR products are widely used in occasions that require high elasticity and good processing performance, such as tires, conveyor belts, and shoe soles. However, in some specific application occasions, such as seals and shock absorbers involving oils or chemicals, the oil resistance and chemical corrosion resistance of SBR are relatively insufficient. And NBR has good oil resistance, aging resistance, and chemical corrosion resistance, can have excellent swelling resistance and permeability resistance to a variety of oils and chemicals, and has good ozone resistance, ultraviolet resistance, and aging resistance. This makes NBR an ideal choice for manufacturing oil-resistant rubber products and chemically corrosion-resistant rubber products.

[0004] Therefore, in view of the performance characteristics of SBR and NBR respectively, it is necessary to combine the advantages of the two to develop a rubber material with more comprehensive performance and a wider application range to meet various different application requirements. Summary of the Invention

[0005] The purpose of the present invention is to develop a rubber material that combines the advantages of SBR and NBR, and obtains rubber materials with different performances by changing the blending ratio to meet various different application requirements.

[0006] To achieve the above invention purpose, this application selects the following technical solutions:

[0007] In the first aspect, this application provides a high-performance rubber material, which includes the following components by weight parts:

[0008] Raw rubber 100 parts;

[0009] Vulcanizing agent 0.2 - 2 parts;

[0010] Accelerator 1 - 3 parts;

[0011] Reinforcing agent 30 - 80 parts;

[0012] Antioxidant 1 - 3 parts;

[0013] 15 - 20 parts of plasticizer;

[0014] 1 - 3 parts of auxiliary agent;

[0015] 5 - 10 parts of filler.

[0016] The raw rubber is composed of NBR and SBR mixed in a weight ratio of NBR:SBR = 70:30 - 90:10.

[0017] Furthermore, the acrylonitrile content of NBR has a great influence on its properties. For example, NBR with a high acrylonitrile content (such as above 35%) has better oil resistance but relatively poor elasticity. Select NBR with a suitable acrylonitrile content according to the required properties. For SBR, attention should be paid to its styrene content. Generally, SBR with a styrene content of 20 - 30% has better comprehensive properties and can be selected according to the actual situation. Preferably, in the raw rubber, NBR with an acrylonitrile content higher than 35% is selected; SBR with a styrene content of 20 - 30% is selected.

[0018] Furthermore, the vulcanizing agent is selected as sulfur. When the NBR content is high, due to the relatively low double - bond activity, it may be necessary to appropriately increase the amount of vulcanizing agent to ensure the degree of vulcanization.

[0019] Furthermore, the accelerator is selected as CBS (N - cyclohexyl - 2 - benzothiazole sulfenamide). The accelerator can accelerate the vulcanization speed, and its effect will also change under different blending ratios of NBR and SBR. For example, when the SBR ratio is high, the effect of the accelerator may be more obvious because the vulcanization activity of SBR is relatively high.

[0020] Furthermore, the reinforcing agent is selected as carbon black. Carbon black can improve the strength and wear resistance of rubber. In the system with a high NBR content, the interaction between carbon black and NBR is strong, which helps to improve oil resistance and hardness; in the system with a high SBR content, carbon black can improve its elasticity and tear resistance.

[0021] Furthermore, the antioxidant is selected as RD (2,2,4 - trimethyl - 1,2 - dihydroquinoline polymer). The antioxidant can prevent the rubber from aging during use. Under different blending ratios, its protective effect on rubber is very important, especially in harsh environments such as high temperature and high humidity.

[0022] Second, the present application provides a preparation method of the high - performance rubber material described in the first aspect, including the following steps:

[0023] S1, add NBR and SBR into a mixer according to a predetermined ratio, add the reinforcing agent and the filler, and knead for 3 - 5 minutes to fully mix the rubber with the reinforcing agent and the filler;

[0024] S2, add anti-aging agent, plasticizer and additives, and continue mixing for 1 - 2 minutes until the temperature reaches 110 - 120 °C to ensure that each additive is evenly dispersed in the rubber.

[0025] S3, add vulcanizing agent and accelerator, and continue mixing for 1 - 2 minutes with the temperature controlled within 80 °C.

[0026] During the mixing process, it is necessary to pay attention to controlling the mixing temperature, generally controlled at 80 - 120 °C. If the temperature is too high, it may cause premature vulcanization (scorching) of the rubber; if the temperature is too low, it will affect the mixing effect and prevent the compounding agents from being fully dispersed.

[0027] Furthermore, for some cases with higher requirements for mixing quality or further processing, the kneaded rubber compound can be transferred to an open mill for supplementary mixing.

[0028] The method for preparing the high-performance rubber material described above further includes:

[0029] S4, transfer the kneaded rubber compound to an open mill for supplementary mixing. The temperature of the rolls of the open mill is controlled at 40 - 60 °C. By adjusting the roll gap, the rubber compound is passed thinly to make the rubber compound more uniform and further improve the dispersion of the compounding agents in the rubber.

[0030] In a third aspect, the present application provides the use of the high-performance rubber material described in the first aspect in the preparation of shock-absorbing and sealing parts.

[0031] In summary, the present application has the following beneficial effects:

[0032] In view of the respective performance characteristics of SBR and NBR, the present invention combines the advantages of both, obtains rubber materials with different performances by changing the blending ratio, and develops rubber materials with more comprehensive performances and wider application ranges, which can meet various different application requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 : Results of oil resistance test;

[0034] Figure 2 : Results of hardness and strength test;

[0035] Figure 3 : Results of elasticity and cold resistance test. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The technical solutions and effects of the present application will be further described in detail below in conjunction with embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention.

[0037] Example 1

[0038] A high-performance rubber material comprises, by weight, 100 parts of raw rubber; 0.2 parts of vulcanizer; 1 part of accelerator; 30 parts of reinforcing agent; 1 part of antioxidant; 15 parts of plasticizer; 1 part of auxiliary agent; and 5 parts of filler.

[0039] The raw rubber is composed of a mixture of NBR and SBR in a weight ratio of NBR:SBR=70:30.

[0040] NBR uses NBR with an acrylonitrile content higher than 35%; SBR uses SBR with a styrene content between 20% and 30%; sulfur is used as a vulcanizing agent; N-cyclohexyl-2-benzothiazole sulfonamide is used as an accelerator; carbon black is used as a reinforcing agent; 2,2,4-trimethyl-1,2-dihydroquinoline polymer is used as an antioxidant; dibutyl diglyceride is used as a plasticizer; polyvinyl alcohol is used as an auxiliary agent; and clay powder is used as a filler.

[0041] The high-performance rubber material is prepared by the following method:

[0042] S1, adding NBR and SBR into an internal mixer according to a predetermined ratio, adding a reinforcing agent and a filler, and mixing for 3 to 5 minutes to fully mix the rubber, the reinforcing agent and the filler;

[0043] S2, adding antioxidant, plasticizer and additives, and continuing to mix for 1 to 2 minutes until the temperature reaches 110 to 120°C to ensure that the additives are evenly dispersed in the rubber;

[0044] S3, adding vulcanizing agent and accelerator, continuing mixing for 1 to 2 minutes, and controlling the temperature within 80°C.

[0045] Example 2

[0046] A high-performance rubber material, which is different from Example 1 only in that, by weight, it includes 100 parts of raw rubber; 1 part of vulcanizer; 2 parts of accelerator; 50 parts of reinforcing agent; 2 parts of antioxidant; 17.5 parts of plasticizer; 2 parts of auxiliary agent; and 7.5 parts of filler.

[0047] Example 3

[0048] A high-performance rubber material, which is different from Example 1 only in that, by weight, it includes 100 parts of raw rubber; 2 parts of vulcanizer; 3 parts of accelerator; 80 parts of reinforcing agent; 3 parts of antioxidant; 20 parts of plasticizer; 3 parts of auxiliary agent; and 10 parts of filler.

[0049] Example 4

[0050] A high-performance rubber material, which is different from that of Example 2 only in that the raw rubber is composed of NBR and SBR mixed at a weight ratio of NBR:SBR = 90:10.

[0051] Comparative Example 1

[0052] A rubber material, which is different from that of Example 2 only in that the raw rubber is 100 parts of NBR.

[0053] Comparative Example 2

[0054] A rubber material, which is different from that of Example 2 only in that the raw rubber is 100 parts of SBR.

[0055] Performance testing

[0056] (1) Oil resistance

[0057] The oil resistance of the rubber materials prepared in Example 2, Example 4, Comparative Example 1 and Comparative Example 2 was tested, and the results are as follows:

[0058] As Figure 1 shown, with the increase of the NBR ratio, the oil resistance of the rubber products is significantly improved. This is because the acrylonitrile groups in the NBR molecular chain have good tolerance to oils. For example, in the standard oil IRM903 oil immersion test, for the blended rubber with different NBR / SBR ratios, after being immersed at 100°C for 72 hours, the volume swelling rate of NBR may be only 10 - 20%, while the volume swelling rate of pure SBR rubber may reach more than 100%.

[0059] (2) Hardness and strength

[0060] The hardness and strength of the rubber materials prepared in Example 2, Example 4, Comparative Example 1 and Comparative Example 2 were tested, and the results are as follows:

[0061] As Figure 2 shown, the hardness and strength of rubbers with different NBR / SBR ratios basically maintain the same level without significant fluctuations, indicating that carbon black has good interaction with both NBR and SBR and can achieve the same strengthening effect. For example, its Shore hardness can reach 60 - 70 (Shore A), and the tensile strength can reach 15 - 20 MPa, which makes this blended rubber suitable for manufacturing products such as seals and industrial rubber rollers that require relatively high hardness and strength.

[0062] (3) Elasticity and cold resistance

[0063] The elasticity and cold resistance of the rubber materials prepared in Example 2, Example 4, Comparative Example 1 and Comparative Example 2 were tested, and the results are as follows:

[0064] As Figure 3As shown, pure NBR has relatively poor elasticity and cold resistance. Since the elasticity of NBR itself is not as good as that of SBR, at a high NBR ratio, the elastic modulus of the rubber is relatively high. At low temperatures (below -30°C), the rubber becomes harder and more brittle. For example, in the cold resistance test, its brittle temperature may be around -35°C. In contrast, the brittle temperature of the blend with a high SBR ratio can reach below -60°C.

[0065] In summary, according to the actual working conditions requirements such as oil resistance, elasticity, and cold resistance of rubber products, a better price-performance balance is achieved under different NBR / SBR ratios.

[0066] This specific embodiment is only an interpretation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A high-performance rubber material, characterized in that, By weight parts, it includes the following components: Raw rubber: 100 parts; Vulcanizing agent: 0.2 - 2 parts; Accelerator: 1 - 3 parts; Reinforcing agent: 30 - 80 parts; Antioxidant: 1 - 3 parts; Plasticizer: 15 - 20 parts; Auxiliary agent: 1 - 3 parts; Filler: 5 - 10 parts. The raw rubber is composed of NBR and SBR mixed in a weight ratio of NBR:SBR = 70:30 - 90:

10.

2. The high-performance rubber material according to claim 1, characterized in that In the raw rubber, the NBR selected is the NBR with acrylonitrile content higher than 35%; the SBR selected is the SBR with styrene content of 20 - 30%.

3. The high-performance rubber material according to claim 1, characterized in that, The vulcanizing agent selected is sulfur.

4. The high-performance rubber material according to claim 1, characterized in that The accelerator selected is N-cyclohexyl-2-benzothiazole sulfenamide.

5. The high-performance rubber material according to claim 1, characterized in that, The reinforcing agent selected is carbon black.

6. The high-performance rubber material according to claim 1, wherein The antioxidant selected is 2,2,4-trimethyl-1,2-dihydroquinoline polymer.

7. The preparation method of the high-performance rubber material according to any one of claims 1-6, characterized in that, It includes the following steps: S1, Add NBR and SBR into the internal mixer according to a predetermined ratio, add the reinforcing agent and the filler, and knead for 3 - 5 minutes to fully mix the rubber with the reinforcing agent and the filler; S2, Add the antioxidant, the plasticizer and the auxiliary agent, and continue to knead for 1 - 2 minutes until the temperature reaches 110 - 120 °C to ensure that each auxiliary agent is evenly dispersed in the rubber; S3, Add the vulcanizing agent and the accelerator, and continue to knead for 1 - 2 minutes, with the temperature controlled within 80 °C.

8. The preparation method of the high-performance rubber material according to claim 7, characterized in that, It also includes: S4, Transfer the kneaded rubber compound to the open mill for supplementary kneading. The roll temperature of the open mill is controlled at 40 - 60 °C. By adjusting the roll gap, the rubber compound is passed thinly to make the rubber compound more uniform and further improve the dispersion of the compounding agents in the rubber.

9. Application of the high-performance rubber material according to any one of claims 1 - 6 in preparing shock-absorbing and sealing parts.

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