Impact fatigue resistant rubber material and preparation method thereof

Abstract

The invention discloses an impact fatigue resistant rubber material and a preparation method thereof, and the impact fatigue resistant rubber material comprises the following components: 20-45 parts of nitrile rubber, 20-30 parts of ethylene propylene rubber, 10-20 parts of POE elastomer, 10-20 parts of butadiene rubber, 10-20 parts of polysulfide rubber, 10-20 parts of white carbon black SODASIL P95, 10-15 parts of an anti-fatigue agent R300, 5-70 parts of carbon black BC10565, 3-5 parts of zinc oxide, 1.0-2.0 parts of stearic acid, 1-2 parts of an anti-aging agent KY-4051, 3-5 parts of homogeneous resin 60NS, and 1.5-2.5 parts of sulfur. 0.2 to 0.5 part of an accelerant TT, 1.0 to 2.0 parts of an accelerant CZ and 3 to 7 parts of an assistant cross-linking agent SR634. The preparation method is three-stage combined smelting. The buffer pad prepared from the rubber material can resist impact fatigue for 300,000 times without cracking, has good heat resistance, and is suitable for being used as an impact fatigue resistant rubber damping material.

Description

Technical Field

[0001] The invention belongs to the field of rubber, and particularly relates to an impact fatigue resistant rubber material and a preparation method thereof. Background Art

[0002] In the operation of mechanical equipment or transportation tools, impacts are inevitable in key parts. If there is no rubber pad for buffering, it may cause irreversible damage to the equipment. After adding rubber buffer pads, impacts and vibrations can be absorbed and mitigated. Due to the unique elasticity, wear resistance and oil resistance of rubber materials, rubber buffer pads can work under many harsh working conditions. Rubber blocks absorb and disperse these impact forces through their own compression and deformation, thereby protecting the equipment from damage. At the same time, rubber blocks can also reduce noise and improve the comfort of equipment. Transportation tools such as cars, trains, airplanes, ships, and various types of engineering machinery all require rubber buffer pads. The fatigue performance of rubber buffer pads is the most critical. After a certain number of impacts, especially impact fatigue, many rubber pads will become hard or soft and sticky, crack, and lose their buffering effect. Therefore, there is an urgent need to develop a rubber material that is resistant to impact fatigue to fill the gap in the industry. Summary of the invention

[0003] The purpose of the present invention is to solve the above problems and provide a cushion made of rubber material which can withstand 300,000 times of impact fatigue without cracking, has good heat resistance and is suitable for use as an impact fatigue resistant rubber shock absorbing material.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: an impact fatigue resistant rubber material, whose components are as follows by mass: 20-45 parts of nitrile rubber, 20-30 parts of ethylene propylene rubber, 10-20 parts of POE elastomer, 10-20 parts of butadiene rubber, 10-20 parts of polysulfide rubber, 10-20 parts of white carbon black SODASIL P95, 10-15 parts of anti-fatigue agent R300, 5-70 parts of carbon black BC10565, 3-5 parts of zinc oxide, 1.0-2.0 parts of stearic acid, 1-2 parts of antioxidant KY-405, 3-5 parts of uniform resin 60NS, 1.5-2.5 parts of sulfur, 0.2-0.5 parts of accelerator TT, 1.0-2.0 parts of accelerator CZ, and 3-7 parts of cross-linking agent SR634.

[0005] Preferably, by mass parts, the composition components of the impact-resistant fatigue rubber material are as follows: 25 parts of nitrile rubber, 25 parts of ethylene-propylene rubber, 10 parts of POE elastomer, 20 parts of cis-butadiene rubber, 20 parts of polysulfide rubber, 15 parts of white carbon black SODASIL P95, 12 parts of anti-fatigue agent R300, 655 parts of carbon black BC105, 3 parts of zinc oxide, 1.0 part of stearic acid, 1 part of anti-aging agent KY-405, 3 parts of uniform resin 60NS, 2.0 parts of sulfur, 0.2 part of accelerator TT, 1.0 part of accelerator CZ, and 4.0 parts of co-crosslinking agent SR634.

[0006] Preferably, by mass parts, the composition components of the impact-resistant fatigue rubber material are as follows: 40 parts of nitrile rubber, 20 parts of ethylene-propylene rubber, 15 parts of POE elastomer, 15 parts of cis-butadiene rubber, 10 parts of polysulfide rubber, 20 parts of white carbon black SODASIL P95, 10 parts of anti-fatigue agent R300, 670 parts of carbon black BC105, 4.5 parts of zinc oxide, 1.5 part of stearic acid, 2 parts of anti-aging agent KY-405, 5 parts of uniform resin 60NS, 1.5 parts of sulfur, 0.5 part of accelerator TT, 1.3 parts of accelerator CZ, and 3.0 parts of co-crosslinking agent SR634.

[0007] Preferably, by mass parts, the composition components of the impact-resistant fatigue rubber material are as follows: 20 parts of nitrile rubber, 30 parts of ethylene-propylene rubber, 20 parts of POE elastomer, 15 parts of cis-butadiene rubber, 15 parts of polysulfide rubber, 15 parts of white carbon black SODASIL P95, 15 parts of anti-fatigue agent R300, 665 parts of carbon black BC105, 4.5 parts of zinc oxide, 2.0 parts of stearic acid, 1.5 parts of anti-aging agent KY-405, 4.5 parts of uniform resin 60NS, 2.5 parts of sulfur, 0.3 part of accelerator TT, 1.8 parts of accelerator CZ, and 6.0 parts of co-crosslinking agent SR634.

[0008] Preferably, by mass parts, the composition components of the impact-resistant fatigue rubber material are as follows: 45 parts of nitrile rubber, 25 parts of ethylene-propylene rubber, 10 parts of POE elastomer, 10 parts of cis-butadiene rubber, 10 parts of polysulfide rubber, 10 parts of white carbon black SODASIL P95, 15 parts of anti-fatigue agent R300, 660 parts of carbon black BC105, 5.0 parts of zinc oxide, 1.5 part of stearic acid, 2.0 parts of anti-aging agent KY-405, 5.0 parts of uniform resin 60NS, 2.0 parts of sulfur, 0.4 part of accelerator TT, 2.0 parts of accelerator CZ, and 7.0 parts of co-crosslinking agent SR634.

[0009] Preferably, the nitrile rubber is KNB1845, the ethylene-propylene rubber is 9950C, the POE is Evolue SP0510, the cis-butadiene rubber is CB-24, and the polysulfide rubber is Thioplast G131.

[0010] A method for preparing the above-mentioned impact fatigue resistant rubber material, the preparation method is as follows:

[0011] Step 1. The first stage of refining:

[0012] Step 1.1: Put nitrile rubber, ethylene propylene rubber, POE elastomer, butadiene rubber and polysulfide rubber into an internal mixer according to the ratio of any one of claims 1 to 5, and mix them at a speed of 30±5 r / min, a mixing time of 360±15 seconds, and a feeding temperature of 150±10° C. to ensure that all components are fully mixed and the various rubbers are initially mixed and uniformly to form a rubber compound with synergistic properties;

[0013] Step 1.2 After the mixing is completed, the mixed material is unloaded and placed in a dark place to stand for no less than 24 hours to ensure that the material is fully matured, improve the uniformity of the rubber compound, and allow the rubber molecular chain enough time to relax and adjust, thereby improving the processing performance of the rubber compound.

[0014] Step 2. First stage mixing:

[0015] Step 2.1 The mixed rubber material is put back into the internal mixer, the starting temperature of the material is 40±5℃, the first stage of mixing is carried out, the speed is 30±5r / min, and the mixing time is 60±10 seconds;

[0016] Step 2.2: Add zinc oxide, stearic acid, antioxidant and uniform resin in sequence, with a rotation speed of 30±5r / min, and continue mixing for 60±10 seconds to ensure that the additives are evenly dispersed in the rubber;

[0017] Step 2.3: Add white carbon black, anti-fatigue agent and carbon black, rotate at 35±5r / min, mix for 90±10 seconds, lift the top bolt and use a broom to clean the powder accumulated on the top bolt to ensure that the materials on the inner wall of the internal mixer and the top bolt are evenly mixed;

[0018] Step 2.4: Continue mixing for 120±10 seconds, with a rotation speed of 30±5r / min and a material temperature of 150±15°C to ensure that all components are fully mixed, and then produce a film on the open mill for use;

[0019] Step 3. Second stage mixing:

[0020] Step 3.1: the material after the first stage of mixing is put back into the internal mixer at a speed of 25±5r / min, and the vulcanization system components of sulfur, accelerator and co-crosslinking agent are added to carry out the second stage of mixing;

[0021] Step 3.2: Mix for 60±10 seconds. During the mixing process, ensure that the vulcanization system components and the rubber are fully mixed;

[0022] Step 3.3 After the mixing is completed, clean the powder accumulated on the top bolt;

[0023] Step 3.4: Continue mixing until the material temperature reaches 90±15°C, the material is fully dispersed, and the sheet is discharged from the mixing mill to obtain an impact fatigue resistant rubber material.

[0024] The working principle of the present invention is:

[0025] Nitrile rubber has good wear resistance and is suitable for use in impact and friction environments. Ethylene propylene rubber has excellent heat resistance and weather resistance, which can improve the elasticity and durability of the material. POE elastomer provides excellent low-temperature toughness and impact performance, and improves the material's fatigue resistance and shock absorption effect. Butadiene rubber has good elasticity, increases the material's flexibility and overall fatigue resistance. Polysulfide rubber has excellent chemical resistance and aging resistance, and can improve the material's stability in high temperature and harsh environments. White carbon black SODASIL P95 has excellent elasticity. Anti-fatigue machine R300 is specially designed to reduce the impact damage to the material. Carbon black BC1056 is the main filler with very low impurity content, which improves the material's strength and wear resistance. Zinc oxide and stearic acid activate the vulcanization reaction, making the reaction faster. Anti-aging agent KY-405 protects the material surface from oxidation and thermal degradation, extending the service life. Uniform resin 60NS has a wider solubility parameter, which can improve the uniformity of the overall material. Sulfur is a vulcanizing agent, which promotes cross-linking reaction with TT and CZ to provide a suitable cross-linking density. The cross-linking agent SR634 can produce metal ion bonds. After breaking due to impact, it can reorganize to generate new bonds, making the molecular chain more evenly stressed.

[0026] Nitrile rubber, EPDM rubber, POE elastomer, butadiene rubber, and polysulfide rubber are used together. The molecular chains, polarities, and glass transition temperatures of various rubbers are different. After mixing, an interpenetrating network structure or an island structure will be formed. During the dynamic fatigue process, the external force is transmitted through the interface of different phases, making the stress distribution more uniform and avoiding stress concentration. When the crack propagates and encounters different phase interfaces, the path may deflect or fork, consuming more energy and slowing down the crack propagation rate. Molecular chain friction and interphase slip at the multiphase interface can improve the energy dissipation efficiency and reduce heat accumulation during the fatigue process.

[0027] Alkaline silica, with a high specific surface area and surface hydroxyl groups, can form hydrogen bonds and physical adsorption with rubber, improve the tensile strength, tear strength and wear resistance of rubber, form the "Payne effect" to dissipate energy during dynamic deformation, and reduce crack propagation. Alkalinity can neutralize acidic byproducts and reduce adverse effects on rubber. Carbon black and silica form a complementary filler network. Carbon black provides high modulus and wear resistance, and silica optimizes dynamic properties. Carbon black can also export static electricity to avoid local heating and aging caused by local charge accumulation. The difference in particle size between carbon black and silica can form a tighter stacking structure, reduce the gaps between fillers, and inhibit crack initiation. Anti-fatigue agents can lubricate rubber molecular chains, promote local stress relaxation, and avoid microcracks caused by stress concentration. Uniform resin promotes uniform dispersion of fillers and rubber compounds, avoids local weaknesses, enhances the interfacial bonding between fillers and substrates, improves load transfer efficiency, and avoids the formation of pores or weak interfaces caused by uneven dispersion.

[0028] Good network interpenetration is achieved at the molecular level. Through the reasonable ratio of materials, energy is evenly dispersed under impact load, local stress concentration is reduced, the risk of cracking is reduced, the overall toughness and strength of the material are improved, and 300,000 impact fatigue tests can be achieved without cracking.

[0029] The present invention selects nitrile rubber, ethylene propylene rubber, POE elastomer, butadiene rubber and polysulfide rubber for use, so that the rubber material has excellent basic physical and mechanical properties. When used together with white carbon black P95, anti-fatigue agent R300 and carbon black BC1056, the impact fatigue resistance can reach 300,000 times without cracking.

[0030] The prepared impact fatigue resistant rubber material has excellent impact resistance and fatigue resistance, and is suitable for rubber products with high strength and long-term use.

[0031] The beneficial effects of the present invention are:

[0032] The performance achieved by the present invention is as follows:

[0033] 1.Hardness 75±5Shore A;

[0034] 2. Tensile strength ≥10MPa;

[0035] 3. Elongation at break ≥ 250%;

[0036] 4. Impact fatigue times ≥ 300,000 times;

[0037] 5. Hot air aging 100℃×72h;

[0038] Hardness change: ±10 Shore A;

[0039] Tensile strength change rate: -30%~30%;

[0040] Change rate of elongation at break: -50%~50%.

[0041] The above performance characteristics indicate that the present invention has excellent basic physical properties, can withstand impact fatigue of up to 300,000 times without cracking, has good heat resistance, and is suitable for use as an impact fatigue resistant rubber material. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] The preparation method of the impact fatigue resistant rubber material of the present invention is as follows:

[0044] Step 1. The first stage of refining:

[0045] Step 1.1: Put nitrile rubber, ethylene propylene rubber, POE elastomer, butadiene rubber and polysulfide rubber into an internal mixer according to the required proportions, and mix them at a speed of 30 r / min, a mixing time of 360 seconds and a feeding temperature of 150° C., ensuring that all components are fully mixed and that the various rubbers are initially mixed and uniformly formed into a rubber compound with synergistic properties;

[0046] Step 1.2 After the mixing is completed, the mixed material is unloaded and placed in a dark place to stand for no less than 24 hours to ensure that the material is fully matured, improve the uniformity of the rubber compound, and allow the rubber molecular chain enough time to relax and adjust, thereby improving the processing performance of the rubber compound.

[0047] Step 2. First stage mixing:

[0048] Step 2.1 The mixed rubber material is put back into the internal mixer, the starting temperature of the material is 40°C, the first stage of mixing is carried out, the speed is 30r / min, and the mixing time is 60 seconds;

[0049] Step 2.2: Add zinc oxide, stearic acid, antioxidant and uniform resin in sequence, at a speed of 30 r / min, and continue mixing for 60 seconds to ensure that the additives are evenly dispersed in the rubber;

[0050] Step 2.3 Add white carbon black, anti-fatigue agent and carbon black, rotate at 35r / min, mix for 90 seconds, lift the top bolt and use a broom to clean the powder accumulated on the top bolt to ensure that the materials on the inner wall of the internal mixer and the top bolt are evenly mixed;

[0051] Step 2.4: Continue mixing for 120 seconds at a speed of 30 r / min and a material temperature of 150°C to ensure that all components are fully mixed and uniformly mixed, and then produce a film on the open mill for use;

[0052] Step 3. Second stage mixing:

[0053] Step 3.1 The materials after the first stage of mixing are put back into the internal mixer at a speed of 25 r / min, and the vulcanization system components of sulfur, accelerator and co-crosslinking agent are added to carry out the second stage of mixing;

[0054] Step 3.2: Mix for 60 seconds. During the mixing process, ensure that the vulcanization system components and the rubber are fully mixed.

[0055] Step 3.3 After the mixing is completed, clean the powder accumulated on the top bolt;

[0056] Step 3.4: Continue mixing until the material temperature reaches 90°C, the material is fully dispersed, and the sheet is discharged from the mixing mill to obtain an impact fatigue resistant rubber material.

[0057] The following four embodiments are used to illustrate the specific application of the method of the present invention:

[0058] The names and proportions of the rubber raw materials in the four embodiments (referred to as Embodiments 1-4, respectively) are shown in Table 1.

[0059] Table 1

[0060]

[0061] Table 2 Performance parameters of the rubber materials prepared in Examples 1-4

[0062]

[0063] From Table 2, it can be seen that the hardness of the rubber material of the present invention is between 75±5Shore A, the tensile strength is ≥10MPa, the elongation at break is ≥250%, and the basic physical and mechanical properties are excellent; at the same time, the impact fatigue resistance is greater than 300,000 times, the hardness changes by -10 to 10 after hot air aging (100℃×72h), the tensile strength change rate is within -30% to 30%, and the elongation change rate is within -50% to 50%. It can be seen that the present invention has excellent basic physical properties, good impact fatigue resistance life, and is suitable for application as impact fatigue resistant rubber material.

[0064] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An impact fatigue resistant rubber material, characterized in that: The components are as follows in parts by mass: 20-45 parts of nitrile rubber, 20-30 parts of EPDM rubber, 10-20 parts of POE elastomer, 10-20 parts of butadiene rubber, 10-20 parts of polysulfide rubber, 10-20 parts of white carbon black SODASIL P95, 10-15 parts of anti-fatigue agent R300, 5-70 parts of carbon black BC10565, 3-5 parts of zinc oxide, 1.0-2.0 parts of stearic acid, 1-2 parts of antioxidant KY-405, 3-5 parts of uniform resin 60NS, 1.5-2.5 parts of sulfur, 0.2-0.5 parts of accelerator TT, 1.0-2.0 parts of accelerator CZ, and 3-7 parts of cross-linking agent SR634.

2. The impact fatigue resistant rubber material according to claim 1, characterized in that: The composition of the rubber compound is as follows by mass: 25 parts of nitrile rubber, 25 parts of ethylene propylene rubber, 10 parts of POE elastomer, 20 parts of butadiene rubber, 20 parts of polysulfide rubber, 15 parts of white carbon black SODASIL P95, 12 parts of anti-fatigue agent R300, 55 parts of carbon black BC1056, 3 parts of zinc oxide, 1.0 parts of stearic acid, 1 part of antioxidant KY-405, 3 parts of uniform resin 60NS, 2.0 parts of sulfur, 0.2 parts of accelerator TT, 1.0 parts of accelerator CZ, and 4.0 parts of cross-linking agent SR634.

3. The impact fatigue resistant rubber material according to claim 1, characterized in that: Its components are as follows: 40 parts of nitrile rubber, 20 parts of ethylene propylene rubber, 15 parts of POE elastomer, 15 parts of butadiene rubber, 10 parts of polysulfide rubber, 20 parts of white carbon black SODASILP95, 10 parts of anti-fatigue agent R300, 70 parts of carbon black BC1056, 4.5 parts of zinc oxide, 1.5 parts of stearic acid, 2 parts of antioxidant KY-405, 5 parts of uniform resin 60NS, 1.5 parts of sulfur, 0.5 parts of accelerator TT, 1.3 parts of accelerator CZ, and 3.0 parts of cross-linking agent SR634.

4. The impact fatigue resistant rubber material according to claim 1, characterized in that: Its components are as follows: 20 parts of nitrile rubber, 30 parts of ethylene propylene rubber, 20 parts of POE elastomer, 15 parts of butadiene rubber, 15 parts of polysulfide rubber, 15 parts of white carbon black SODASILP95, 15 parts of anti-fatigue agent R300, 665 parts of carbon black BC105, 4.5 parts of zinc oxide, 2.0 parts of stearic acid, 1.5 parts of antioxidant KY-405, 4.5 parts of uniform resin 60NS, 2.5 parts of sulfur, 0.3 parts of accelerator TT, 1.8 parts of accelerator CZ, and 6.0 parts of cross-linking agent SR634.

5. The impact fatigue resistant rubber material according to claim 1, characterized in that: Its components are as follows: 45 parts of nitrile rubber, 25 parts of ethylene propylene rubber, 10 parts of POE elastomer, 10 parts of butadiene rubber, 10 parts of polysulfide rubber, 10 parts of white carbon black SODASILP95, 15 parts of anti-fatigue agent R300, 660 parts of carbon black BC105, 5.0 parts of zinc oxide, 1.5 parts of stearic acid, 2.0 parts of antioxidant KY-405, 5.0 parts of uniform resin 60NS, 2.0 parts of sulfur, 0.4 parts of accelerator TT, 2.0 parts of accelerator CZ, and 7.0 parts of cross-linking agent SR634.

6. The impact fatigue resistant rubber material according to any one of claims 1 to 5, characterized in that: The nitrile rubber is KNB1845, the ethylene-propylene rubber is 9950C, the POE is Evolue SP0510, the butadiene rubber is CB-24, and the polysulfide rubber is Thioplast G131.

7. A method for preparing the impact fatigue resistant rubber material according to any one of claims 1 to 5, characterized in that: The preparation method is as follows: Step 1. The first stage of refining: Step 1.1: Put nitrile rubber, ethylene propylene rubber, POE elastomer, butadiene rubber and polysulfide rubber into an internal mixer according to the ratio of any one of claims 1 to 5, and mix them at a speed of 30±5 r / min, a mixing time of 360±15 seconds, and a feeding temperature of 150±10° C. to ensure that all components are fully mixed and the various rubbers are initially mixed and uniformly to form a rubber compound with synergistic properties; Step 1.2 After the mixing is completed, the mixed material is unloaded and placed in a dark place to stand for no less than 24 hours to ensure that the material is fully matured, improve the uniformity of the rubber compound, and allow the rubber molecular chain enough time to relax and adjust, thereby improving the processing performance of the rubber compound. Step 2. First stage mixing: Step 2.1 The mixed rubber material is put back into the internal mixer, the starting temperature of the material is 40±5℃, the first stage of mixing is carried out, the speed is 30±5r / min, and the mixing time is 60±10 seconds; Step 2.2: Add zinc oxide, stearic acid, antioxidant and uniform resin in sequence, with a rotation speed of 30±5r / min, and continue mixing for 60±10 seconds to ensure that the additives are evenly dispersed in the rubber; Step 2.3: Add white carbon black, anti-fatigue agent and carbon black, rotate at 35±5r / min, mix for 90±10 seconds, lift the top bolt and use a broom to clean the powder accumulated on the top bolt to ensure that the materials on the inner wall of the internal mixer and the top bolt are evenly mixed; Step 2.4: Continue mixing for 120±10 seconds, with a rotation speed of 30±5r / min and a material temperature of 150±15°C to ensure that all components are fully mixed, and then produce a film on the open mill for use; Step 3. Second stage mixing: Step 3.1: the material after the first stage of mixing is put back into the internal mixer at a speed of 25±5r / min, and the vulcanization system components of sulfur, accelerator and co-crosslinking agent are added to carry out the second stage of mixing; Step 3.2: Mix for 60±10 seconds. During the mixing process, ensure that the vulcanization system components and the rubber are fully mixed; Step 3.3 After the mixing is completed, clean the powder accumulated on the top bolt; Step 3.4: Continue mixing until the material temperature reaches 90±15°C, the material is fully dispersed, and the sheet is discharged from the mixing mill to obtain an impact fatigue resistant rubber material.

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