Preparation method of wear-resistant damping rubber

Abstract

The invention relates to a preparation method of wear-resistant damping rubber, and belongs to the technical field of composite materials. The wear-resistant damping rubber is prepared from natural rubber, zinc oxide, stearic acid, carbon black, modified carbon nanotubes, silicone rubber, an anti-aging agent, paraffin oil, a heat-resistant agent, sulfur and an accelerant as raw materials. The rubber is filled with the modified carbon nanotube compounded carbon black filler, a multi-scale reinforcing network is formed in the rubber, the stress transmission efficiency is enhanced, the responsiveness of the material under a high-frequency dynamic load is improved, and the damping performance of the rubber is effectively improved. In addition, the carbon nanotubes can delay softening and aging of the rubber under a high-temperature condition and improve the defect of poor heat resistance of the natural rubber, and the finally prepared rubber is uniform in component and good in wear resistance and vibration reduction performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite materials, and specifically relates to a preparation method of wear-resistant and shock-absorbing rubber. Background Art

[0002] With the increasing requirements of modern industry for the operation stability, safety and durability of equipment, the demand for shock-absorbing rubber components in fields such as the automotive industry, rail transit, and construction machinery is gradually expanding. The raw materials used for shock-absorbing rubber are mainly styrene-butadiene rubber and natural rubber. Among them, the shock-absorbing performance of natural rubber is better than that of styrene-butadiene rubber. The internal friction generated by the movement of molecular chain segments is smaller, and the vibration isolation effect is remarkable in low-frequency vibration scenarios (such as the automotive suspension system). The elasticity of styrene-butadiene rubber is slightly inferior to that of natural rubber, but it has better heat resistance.

[0003] Carbon nanotubes, with a high aspect ratio and ultra-high tensile strength (the theoretical strength is 100 times that of steel), can form a dense filling network in the rubber matrix, effectively inhibit crack propagation, and significantly improve the shock-absorbing performance and wear resistance. However, the dispersion of carbon nanotubes in rubber is poor, and there is a large gap between the improvement effect on rubber and the theoretical value. Using plasticizers can improve the fluidity of rubber, reduce the friction between rubber polymer molecules, and improve the dispersion of fillers in rubber polymers. However, small molecule plasticizers are prone to migration inside the rubber, resulting in failure. Plasticizer migration will cause the rubber products to soften, the surface to become sticky or even crack, reducing their mechanical strength and durability. Based on this, the present invention provides a preparation method of wear-resistant and shock-absorbing rubber. Summary of the Invention

[0004] The purpose of the present invention is to provide a preparation method of wear-resistant and shock-absorbing rubber to solve the problems mentioned in the above background art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A preparation method of wear-resistant and shock-absorbing rubber includes the following steps:

[0007] First step: Mix 3,5-dihydroxyacetophenone, 2-ethylhexanoic acid, and N,N-dimethylformamide in a three-necked flask, install a condenser and a thermometer, start magnetic stirring, then add p-toluenesulfonic acid to the three-necked flask, and react at a temperature of 140 - 150 °C for 4 h. After the reaction is completed, add a 10% sodium carbonate solution by mass fraction to the three-necked flask for washing, extract with ethyl acetate, and separate the organic layer with a separating funnel. After that, the organic layer is rotary evaporated to obtain a plasticizing unit;

[0008] Step 2: Mix the plasticizing unit, 3-aminopropyltriethoxysilane, paraformaldehyde, and glacial acetic acid in a three-necked flask. Install a condenser and a thermometer, turn on magnetic stirring, and react at 65 - 75 °C for 6 h. After the reaction is completed, add saturated ammonium chloride solution to the three-necked flask to quench the reaction, extract with dichloromethane, separate the organic layer with a separatory funnel, then rotary evaporate to remove the solvent, and recrystallize the remaining solid to obtain the grafting unit;

[0009] Step 3: Mix the grafting unit, ethanol solution, and carbon nanotubes in a three-necked flask. Install a condenser and a thermometer, turn on magnetic stirring, and react at 70 - 80 °C for 2 h. After the reaction is completed, filter out the carbon nanotubes, and place the carbon nanotubes in an oven at 50 °C to dry to a constant weight to obtain modified carbon nanotubes;

[0010] Step 4: Add natural rubber to an open mill, thin-film plasticize it 8 - 10 times with a roll gap of 0.5 mm, then adjust the roll gap to 1 mm, and sequentially add zinc oxide, stearic acid, carbon black, modified carbon nanotubes, silicone rubber, antioxidant, paraffin oil, and heat-resistant agent to the open mill. Knead for 4 - 5 min, and finally add sulfur and accelerator to the open mill. After kneading for 2 - 3 min, thin-film plasticize with a roll gap of 0.2 mm and make 6 - 8 triangular bales to obtain a kneaded rubber for standby;

[0011] Step 5: Let the kneaded rubber stand for 24 h and then add it to an internal mixer for vulcanization. After the vulcanization is completed, a wear-resistant and shock-absorbing rubber is obtained.

[0012] Further, the carbon black is carbon black N330.

[0013] Further, the carbon nanotubes have a diameter specification of 20 - 30 nm and a length specification of 1 - 2 nm.

[0014] Further, the antioxidant is antioxidant 4010NA.

[0015] Further, the accelerator is accelerator DM.

[0016] Further, the heat-resistant agent is N-phenylmaleimide.

[0017] Further, the dosage ratio of 3,5-dihydroxyacetophenone, 2-ethylhexanoic acid, N,N-dimethylformamide, and p-toluenesulfonic acid used in Step 1 is 0.05 mol : (0.11 - 0.12) mol : 50 - 60 mL : (0.005 - 0.006) mol.

[0018] Further, the effective formaldehyde content of the paraformaldehyde used in Step 2 is 96%.

[0019] Furthermore, the amount ratio of the plasticizing unit, 3-aminopropyltriethoxysilane, polyformaldehyde and glacial acetic acid used in step 2 is 0.03 mol: 0.03 mol: (1-1.2) g: 20-30 mL.

[0020] Furthermore, the ethanol solution used in step 3 is an ethanol aqueous solution with a volume fraction of 90%.

[0021] Furthermore, the amount ratio of the grafting unit, the ethanol solution, and the carbon nanotubes used in step 3 is 6-10 g: 100 mL: 5 g.

[0022] Furthermore, in terms of mass fractions, the usage ratios of natural rubber, zinc oxide, stearic acid, carbon black, modified carbon nanotubes, silicone rubber, antioxidant, paraffin oil, heat-resistant agent, sulfur and accelerator used in the fourth step are (70-80) parts: (4-5) parts: (2-2.8) parts: (24-30) parts: (6-10) parts: (20-30) parts: (1.6-2.4) parts: (1.8-2.6) parts: (3-4) parts: (1.5-2) parts: (1-1.4) parts.

[0023] Furthermore, in the fifth step, the vulcanization temperature condition is 140-150° C., and the vulcanization time condition is 50-60 min.

[0024] Beneficial effects of the present invention:

[0025] 1) The present invention uses 3,5-dihydroxyacetophenone and 2-ethylhexanoic acid as raw materials, and obtains a plasticizing unit by an esterification reaction between the hydroxyl group of 3,5-dihydroxyacetophenone and the carboxyl group of 2-ethylhexanoic acid under the catalytic condition of p-toluenesulfonic acid. Then, the plasticizing unit, 3-aminopropyltriethoxysilane and polyformaldehyde are used as raw materials, and the active hydrogen component of the plasticizing unit is reacted with the amino group of 3-aminopropyltriethoxysilane and the aldehyde group of formaldehyde obtained by decomposing the polyformaldehyde under the condition of glacial acetic acid as a solvent to obtain a grafting unit by a Mannich reaction, and finally the grafting unit is grafted onto the carbon nanotube by using the silicon-oxygen bond structure of the grafting unit. A modified carbon nanotube is obtained on the surface. The modified carbon nanotube of the present invention has a long-chain ester group on the surface, which can be inserted into the rubber molecular chain, reduce the stress concentration inside the rubber, increase the molecular distance, and promote the relative slip between the molecular chains, thereby absorbing the energy of the external dynamic load and improving the elastic shock absorption performance. The active components on the surface are combined with the surface of the carbon nanotube by chemical bond grafting, so it is not easy to migrate and fail. In addition, the modified carbon nanotube of the present invention has a reduced number of surface active hydrogen bonds after modification, which can prevent the modified carbon nanotube from agglomerating and effectively improve the dispersibility of the modified carbon nanotube in rubber.

[0026] 2) The present invention uses natural rubber, zinc oxide, stearic acid, carbon black, modified carbon nanotubes, silicone rubber, anti-aging agent, paraffin oil, heat-resistant agent, sulfur, and accelerator as raw materials to prepare a wear-resistant and shock-absorbing rubber. The present invention first thinly passes and plasticizes natural rubber, then sequentially adds the remaining raw materials and thinly passes and makes a triangular package operation. After standing to eliminate internal mechanical stress, it is vulcanized to obtain a wear-resistant and shock-absorbing rubber. The present invention uses modified carbon nanotubes compounded with carbon black filler to fill the rubber, forming a multi-scale reinforcement network inside the rubber, enhancing the stress transfer efficiency, improving the response ability of the material under high-frequency dynamic loads, and effectively improving the shock-absorbing performance of the rubber. In addition, carbon nanotubes can also delay the softening and aging of rubber under high-temperature conditions, improving the disadvantage of poor heat resistance of natural rubber. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an infrared spectrum test chart of the modified carbon nanotubes of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0029] Example 1

[0030] A modified carbon nanotube is prepared by the following steps:

[0031] First step: Mix 0.05 mol of 3,5-dihydroxyacetophenone, 0.11 mol of 2-ethylhexanoic acid, and 50 mL of N,N-dimethylformamide in a three-necked flask, install a condenser and a thermometer, turn on magnetic stirring, then add 0.005 mol of p-toluenesulfonic acid to the three-necked flask, and react at a temperature of 140 °C for 4 h. After the reaction is completed, add a 10% sodium carbonate solution by mass fraction to the three-necked flask for washing, extract with ethyl acetate, separate the organic layer with a separating funnel, and then rotary evaporate the organic layer to obtain a plasticizing unit;

[0032] Second step: Mix 0.03 mol of the plasticizing unit, 0.03 mol of 3-aminopropyltriethoxysilane, 1 g of paraformaldehyde with an effective formaldehyde content of 96%, and 20 mL of glacial acetic acid in a three-necked flask, install a condenser and a thermometer, turn on magnetic stirring, and react at a temperature of 65 °C for 6 h. After the reaction is completed, add a saturated ammonium chloride solution to the three-necked flask to quench the reaction, extract with dichloromethane, separate the organic layer with a separating funnel, then rotary evaporate to remove the solvent, and recrystallize the remaining solid to obtain a grafting unit;

[0033] Step 3: Mix 6 g of grafting unit, 100 mL of ethanol solution with a volume fraction of 90%, and 5 g of carbon nanotubes in a three-necked flask. Install a condenser and a thermometer, turn on magnetic stirring, and react for 2 h at a temperature of 70 °C. After the reaction is completed, filter out the carbon nanotubes, and place the carbon nanotubes in an oven at 50 °C to dry to constant weight to obtain modified carbon nanotubes.

[0034] Among them, the diameter specification of the carbon nanotubes used in this example is 20 - 30 nm, and the length specification is 1 - 2 nm.

[0035] Example 2

[0036] Step 1: Mix 0.05 mol of 3,5-dihydroxyacetophenone, 0.115 mol of 2-ethylhexanoic acid, and 55 mL of N,N-dimethylformamide in a three-necked flask. Install a condenser and a thermometer, turn on magnetic stirring, then add 0.0055 mol of p-toluenesulfonic acid to the three-necked flask, and react for 4 h at a temperature of 145 °C. After the reaction is completed, add a 10% sodium carbonate solution by mass to wash the three-necked flask, extract with ethyl acetate, separate the organic layer with a separating funnel, and then rotary evaporate the organic layer to obtain a plasticizing unit;

[0037] Step 2: Mix 0.03 mol of plasticizing unit, 0.03 mol of 3-aminopropyltriethoxysilane, 1.1 g of paraformaldehyde with an effective formaldehyde content of 96%, and 25 mL of glacial acetic acid in a three-necked flask. Install a condenser and a thermometer, turn on magnetic stirring, and react for 6 h at a temperature of 70 °C. After the reaction is completed, add a saturated ammonium chloride solution to quench the reaction, extract with dichloromethane, separate the organic layer with a separating funnel, then rotary evaporate to remove the solvent, and recrystallize the remaining solid to obtain a grafting unit;

[0038] Step 3: Mix 8 g of grafting unit, 100 mL of ethanol solution with a volume fraction of 90%, and 5 g of carbon nanotubes in a three-necked flask. Install a condenser and a thermometer, turn on magnetic stirring, and react for 2 h at a temperature of 75 °C. After the reaction is completed, filter out the carbon nanotubes, and place the carbon nanotubes in an oven at 50 °C to dry to constant weight to obtain modified carbon nanotubes.

[0039] Among them, the diameter specification of the carbon nanotubes used in this example is 20 - 30 nm, and the length specification is 1 - 2 nm.

[0040] Example 3

[0041] Step 1: Mix 0.05 mol of 3,5-dihydroxyacetophenone, 0.12 mol of 2-ethylhexanoic acid, and 60 mL of N,N-dimethylformamide in a three-necked flask. Install a condenser and a thermometer, start magnetic stirring, then add 0.006 mol of p-toluenesulfonic acid to the three-necked flask, and react at 150 °C for 4 h. After the reaction is completed, add a 10% sodium carbonate solution by mass to the three-necked flask for washing, extract with ethyl acetate, separate the organic layer with a separatory funnel, and then rotary evaporate the organic layer to obtain a plasticizing unit;

[0042] Step 2: Mix 0.03 mol of the plasticizing unit, 0.03 mol of 3-aminopropyltriethoxysilane, 1.2 g of paraformaldehyde with an effective formaldehyde content of 96%, and 30 mL of glacial acetic acid in a three-necked flask. Install a condenser and a thermometer, start magnetic stirring, and react at 75 °C for 6 h. After the reaction is completed, add a saturated ammonium chloride solution to the three-necked flask to quench the reaction, extract with dichloromethane, separate the organic layer with a separatory funnel, then rotary evaporate to remove the solvent, and recrystallize the remaining solid to obtain a grafting unit;

[0043] Step 3: Mix 10 g of the grafting unit, 100 mL of an ethanol solution with a volume fraction of 90%, and 5 g of carbon nanotubes in a three-necked flask. Install a condenser and a thermometer, start magnetic stirring, and react at 80 °C for 2 h. After the reaction is completed, filter out the carbon nanotubes, and place the carbon nanotubes in an oven at 50 °C to dry to a constant weight to obtain modified carbon nanotubes.

[0044] Among them, the diameter specification of the carbon nanotubes used in this example is 20 - 30 nm, and the length specification is 1 - 2 nm.

[0045] Experimental Example 1

[0046] The modified carbon nanotubes obtained in Example 1 were characterized by infrared spectroscopy. After pressing with potassium bromide tablets, infrared spectroscopy tests were carried out on a Nicolet 6700 Fourier transform infrared spectrometer produced by Thermo Company in the United States. As Figure 1 shown, an absorption peak of N—H stretching vibration appears at 3500 - 3300 cm -1 , an absorption peak of hydrogen atoms on the benzene ring appears at 3100 - 3000 cm -1 , an absorption peak of C=O stretching vibration of the ester group appears at 1760 - 1730 cm -1 , an absorption peak of C=O stretching vibration of the carbonyl group appears at 1710 - 1680 cm -1 , and a characteristic peak of Si—O—Si appears at 1100 - 1000 cm -1 , indicating that the reaction occurred successfully.

[0047] Example 4

[0048] A preparation method of wear-resistant and shock-absorbing rubber, comprising the following steps:

[0049] First step: By mass, add 70 parts of natural rubber into an open mill, conduct thin-pass plasticization 8 times with a roll gap of 0.5 mm, then adjust the roll gap to 1 mm, and sequentially add 4 parts of zinc oxide, 2 parts of stearic acid, 24 parts of carbon black N330, 6 parts of the modified carbon nanotubes obtained in Example 1, 20 parts of silicone rubber, 1.6 parts of antioxidant 4010NA, 1.8 parts of paraffin oil, 3 parts of N-phenylmaleimide into the open mill, knead for 4 min, and finally add 1.5 parts of sulfur and 1 part of accelerator DM into the open mill, conduct thin-pass with a roll gap of 0.2 mm and make triangular packages 6 times after kneading for 2 min to obtain a mixed rubber for standby;

[0050] Second step: Let the mixed rubber stand for 24 h, then add it into a closed mill for vulcanization, vulcanize at a temperature of 140 °C for 50 min, and a wear-resistant and shock-absorbing rubber is obtained after the vulcanization ends.

[0051] Example 5

[0052] A preparation method of wear-resistant and shock-absorbing rubber, comprising the following steps:

[0053] First step: By mass, add 75 parts of natural rubber into an open mill, conduct thin-pass plasticization 9 times with a roll gap of 0.5 mm, then adjust the roll gap to 1 mm, and sequentially add 4.5 parts of zinc oxide, 2.4 parts of stearic acid, 27 parts of carbon black N330, 8 parts of the modified carbon nanotubes obtained in Example 2, 25 parts of silicone rubber, 2 parts of antioxidant 4010NA, 2.2 parts of paraffin oil, 3.5 parts of N-phenylmaleimide into the open mill, knead for 4.5 min, and finally add 1.75 parts of sulfur and 1.2 parts of accelerator DM into the open mill, conduct thin-pass with a roll gap of 0.2 mm and make triangular packages 7 times after kneading for 2.5 min to obtain a mixed rubber for standby;

[0054] Second step: Let the mixed rubber stand for 24 h, then add it into a closed mill for vulcanization, vulcanize at a temperature of 145 °C for 55 min, and a wear-resistant and shock-absorbing rubber is obtained after the vulcanization ends.

[0055] Example 6

[0056] A preparation method of wear-resistant and shock-absorbing rubber, comprising the following steps:

[0057] Step 1: By mass fraction, add 80 parts of natural rubber into an open mill, conduct thin-pass plasticization 10 times with a roll gap of 0.5 mm, then adjust the roll gap to 1 mm, and sequentially add 5 parts of zinc oxide, 2.8 parts of stearic acid, 30 parts of carbon black N330, 10 parts of the modified carbon nanotubes obtained in Example 3, 30 parts of silicone rubber, 2.4 parts of antioxidant 4010NA, 2.6 parts of paraffin oil, and 4 parts of N-phenylmaleimide into the open mill, knead for 5 min, and finally add 2 parts of sulfur and 1.4 parts of accelerator DM into the open mill, conduct thin-pass with a roll gap of 0.2 mm and make 8 triangular bales after kneading for 3 min to obtain a kneaded rubber for standby;

[0058] Step 2: Let the kneaded rubber stand for 24 h, then add it into an internal mixer for vulcanization, vulcanize for 60 min at a temperature of 150 °C, and a wear-resistant and shock-absorbing rubber is obtained after the vulcanization ends.

[0059] Comparative Example 1

[0060] Replace the raw material "modified carbon nanotubes obtained in Example 2" used in Example 5 with unmodified conventional carbon nanotubes, and keep the other conditions and preparation steps unchanged.

[0061] A preparation method of a wear-resistant and shock-absorbing rubber, comprising the following steps:

[0062] Step 1: By mass fraction, add 75 parts of natural rubber into an open mill, conduct thin-pass plasticization 9 times with a roll gap of 0.5 mm, then adjust the roll gap to 1 mm, and sequentially add 4.5 parts of zinc oxide, 2.4 parts of stearic acid, 27 parts of carbon black N330, 8 parts of carbon nanotubes, 25 parts of silicone rubber, 2 parts of antioxidant 4010NA, 2.2 parts of paraffin oil, and 3.5 parts of N-phenylmaleimide into the open mill, knead for 4.5 min, and finally add 1.75 parts of sulfur and 1.2 parts of accelerator DM into the open mill, conduct thin-pass with a roll gap of 0.2 mm and make 7 triangular bales after kneading for 2.5 min to obtain a kneaded rubber for standby;

[0063] Step 2: Let the kneaded rubber stand for 24 h, then add it into an internal mixer for vulcanization, vulcanize for 55 min at a temperature of 145 °C, and a wear-resistant and shock-absorbing rubber is obtained after the vulcanization ends

[0064] Comparative Example 2

[0065] This comparative example is a commercially available automotive shock-absorbing rubber.

[0066] Experimental Example 2

[0067] The damping performance test and wear resistance performance test were respectively carried out on a wear-resistant shock-absorbing rubber obtained in Examples 4-6 and Comparative Example 1 and the automotive shock-absorbing rubber in Comparative Example 2. The damping performance test conditions were: frequency 1 Hz, temperature 25 °C, strain range 50-100%. The wear resistance performance test was carried out with reference to the national standard GB / T9867-2008 "Determination of Abrasion Resistance of Vulcanized Rubber or Thermoplastic Rubber". The test results are shown in Table 1:

[0068] Table 1

[0069] Project Loss factor tanδ <![CDATA[Loss (mm 3 )]]> Example 4 0.421 86 Example 5 0.436 82 Example 6 0.432 84 Comparative Example 1 0.379 93 Comparative Example 2 0.318 126

[0070] As can be seen from Table 1, the loss factor tanδ of the wear-resistant shock-absorbing rubber in Examples 4-6 and Comparative Example 1 is higher than that of the vehicle shock-absorbing rubber in Comparative Example 2, and the loss is less than that of Comparative Example 2, indicating that the wear-resistant shock-absorbing rubber of the present invention has better shock-absorbing performance and wear resistance performance. Although the wear-resistant shock-absorbing rubber in Comparative Example 1 also has better performance than the commercially available vehicle shock-absorbing rubber in Comparative Example 2, there are differences from Examples 4-6. The reason is that the carbon nanotubes were not modified according to the preparation method of the present invention, and the carbon nanotubes were not evenly dispersed.

[0071] The preparation method of a wear-resistant shock-absorbing rubber provided by the present invention has been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above examples is only used to help understand the method and its core idea of the present invention, including the best mode, and also enables any person skilled in the art to practice the present invention, including manufacturing and using any device or system, and implementing any combination method. It should be noted that for those of ordinary skill in the art in this technical field, several improvements and modifications can be made to the present invention without departing from the principle of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention can be combined with each other in any way. The exhaustive description of these combinations is omitted in this specification only for the sake of saving space and resources. Therefore, the present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A preparation method of wear-resistant shock-absorbing rubber, characterized in that, It includes the following steps: Carbon nanotube modification: Mix 3,5-dihydroxyacetophenone, 2-ethylhexanoic acid, and N,N-dimethylformamide evenly, then add p-toluenesulfonic acid to the system, control the temperature at 140 - 150 °C for reaction to obtain a plasticizing unit. The obtained plasticizing unit further reacts with 3-aminopropyltriethoxysilane, paraformaldehyde, and glacial acetic acid, control the temperature at 65 - 75 °C for reaction to obtain a grafting unit. Finally, use an ethanol solution as a solvent to graft the grafting unit onto the surface of carbon nanotubes to obtain modified carbon nanotubes; Preparation of wear-resistant and shock-absorbing rubber: After the natural rubber is thin-sliced and plasticized, add zinc oxide, stearic acid, carbon black, modified carbon nanotubes, silicone rubber, antioxidant, paraffin oil, heat-resistant agent, sulfur, and accelerator to the open mill in sequence, carry out open milling, thin-slicing, and making a triangular package, and vulcanization process to obtain a wear-resistant and shock-absorbing rubber.

2. The preparation method of a wear-resistant and shock-absorbing rubber according to claim 1, characterized in that, The carbon black is carbon black N330.

3. The preparation method of a wear-resistant and shock-absorbing rubber according to claim 1, characterized in that, The diameter specification of the carbon nanotubes is 20 - 30 nm, and the length specification is 1 - 2 nm.

4. The preparation method of a wear-resistant and shock-absorbing rubber according to claim 1, characterized in that, The accelerator is accelerator DM, and the antioxidant is antioxidant 4010NA.

5. The preparation method of a wear-resistant and shock-absorbing rubber according to claim 1, characterized in that, The heat-resistant agent is N-phenylmaleimide.

6. The preparation method of a wear-resistant and shock-absorbing rubber according to claim 1, characterized in that, In the carbon nanotube modification step, the dosage ratio of 3,5-dihydroxyacetophenone, 2-ethylhexanoic acid, N,N-dimethylformamide, and p-toluenesulfonic acid used is 0.05 mol : (0.11 - 0.12) mol : 50 - 60 mL : (0.005 - 0.006) mol.

7. The preparation method of a wear-resistant and shock-absorbing rubber according to claim 1, characterized in that, In the carbon nanotube modification step, the effective formaldehyde content of the paraformaldehyde used is 96%, and the dosage ratio of the plasticizing unit, 3-aminopropyltriethoxysilane, paraformaldehyde, and glacial acetic acid used is 0.03 mol : 0.03 mol : (1 - 1.2) g : 20 - 30 mL.

8. The preparation method of a wear-resistant and shock-absorbing rubber according to claim 1, characterized in that In the carbon nanotube modification step, the ethanol solution used is an ethanol aqueous solution with a volume fraction of 90%, and the dosage ratio of the grafting unit, ethanol solution, and carbon nanotubes used is 6 - 10 g : 100 mL : 5 g.

9. The preparation method of a wear-resistant and shock-absorbing rubber according to claim 1, wherein, In the preparation step of the wear-resistant and shock-absorbing rubber, the temperature condition for vulcanization is 140 - 150 °C, and the time condition for vulcanization is 50 - 60 min.

10. The preparation method of a wear-resistant and shock-absorbing rubber according to claim 1, wherein, By mass fraction, the dosage ratio of natural rubber, zinc oxide, stearic acid, carbon black, modified carbon nanotubes, silicone rubber, antioxidant, paraffin oil, heat-resistant agent, sulfur, and accelerator used in the preparation step of the wear-resistant and shock-absorbing rubber is (70 - 80) parts : (4 - 5) parts : (2 - 2.8) parts : (24 - 30) parts : (6 - 10) parts : (20 - 30) parts : (1.6 - 2.4) parts : (1.8 - 2.6) parts : (3 - 4) parts : (1.5 - 2) parts : (1 - 1.4) parts.

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