Low-temperature-resistant rubber for loading wheel and preparation method of low-temperature-resistant rubber

Abstract

The invention discloses low-temperature-resistant rubber for a bogie wheel and a preparation method of the low-temperature-resistant rubber, and belongs to the technical field of synthetic rubber. The low-temperature-resistant rubber comprises the following components in parts by weight: 6-8 parts of composite filler, 16-21 parts of a low-temperature-resistant copolymer, 50-60 parts of solution polymerized styrene-butadiene rubber, 3-5 parts of zinc oxide, 1.6-2.5 parts of stearic acid, 1.8-2.2 parts of a rubber anti-aging agent, 1.8-2 parts of a vulcanization accelerator and 1-1.2 parts of sulfur. The heat-conducting property and the low-temperature resistance of the material are improved by preparing the composite filler, and meanwhile, the low-temperature-resistant copolymer is prepared and mixed with the solution polymerized styrene-butadiene rubber, so that the low-temperature resistance of the material is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of synthetic rubber, and specifically refers to a low-temperature resistant rubber for road wheels and a preparation method thereof. Background Art

[0002] The molecular chain of natural rubber has good flexibility, less hysteresis loss and low heat generation, but the rubber layer of the road wheel is generally thicker, and rubber itself is a poor conductor of heat. The mechanical energy lost under the action of external force is easily converted into heat, causing the internal temperature of the material to rise, and the internal heat is difficult to conduct out. During long-term operation, the rubber layer is prone to aging and even block falling, seriously affecting the service life and safety; in winter, the road surface in cold areas is covered with more ice and snow. Replacing winter tires can provide a shorter braking distance for the car. The tread rubber material of winter tires needs to have excellent low temperature resistance and good anti-wet and anti-ice skid performance. At the same time, it must meet the requirements of elasticity, low rolling resistance, wear resistance and other properties. However, in a low temperature environment, the thermal motion of rubber molecules is weakened, and the molecular chains and molecular segments are prone to lose elasticity due to freezing; low temperature causes the rubber hardness to increase and lose its due elasticity, which will reduce the vehicle's handling stability. Therefore, in order to ensure the long-term stable use and driving safety of rubber tires, the rubber material used for road wheels must have excellent mechanical properties, thermal aging properties and flexibility at low temperatures.

[0003] The existing technology currently has the following main problems: synthetic rubber materials have poor thermal aging performance and low temperature resistance. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a low-temperature resistant rubber for road wheels and a preparation method thereof. In order to solve the problems of poor mechanical properties, thermal aging properties and low-temperature resistance, the present invention proposes to improve the thermal conductivity and low-temperature resistance of the material by preparing a composite filler, and at the same time prepare a low-temperature resistant copolymer and mix it with solution-polymerized styrene-butadiene rubber, thereby achieving further improvement in the low-temperature resistance of the material.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: The present invention proposes a low-temperature resistant rubber for road wheels, and the low-temperature resistant rubber for road wheels includes the following components in parts by weight: 6-8 parts of composite filler, 16-21 parts of low-temperature resistant copolymer, 50-60 parts of solution-polymerized styrene-butadiene rubber, 3-5 parts of zinc oxide, 1.6-2.5 parts of stearic acid, 1.8-2.2 parts of rubber antioxidant, 1.8-2 parts of vulcanization accelerator, and 1-1.2 parts of sulfur.

[0006] Preferably, the rubber antioxidant is one of antioxidant 124, antioxidant 4010NA, antioxidant 4020 and antioxidant H;

[0007] Preferably, the vulcanization accelerator is one of accelerator TMTD, accelerator NA-22, accelerator M and accelerator NS.

[0008] Preferably, the composite filler is prepared from the following components in parts by weight: 15-18 parts of poly(4-styrenesulfonic acid-co-maleic acid) sodium salt, 16-20 parts of ferric chloride hexahydrate, 45-50 parts of sodium acetate, 10-13 parts of tetraethyl silicate, and 12-16 parts of methacryloxypropyltrimethoxysilane.

[0009] Preferably, the low-temperature resistant copolymer is prepared from the following components in parts by weight: 20-30 parts of 2-methyl-1,3-butadiene, 8-10 parts of 1,3-butadiene, and 12-16 parts of β-farnesene.

[0010] Preferably, the method for preparing the composite filler specifically comprises the following steps:

[0011] (1) Dissolve poly(4-styrenesulfonic acid-co-maleic acid) sodium salt in ethylene glycol, add ferric chloride hexahydrate and sodium acetate, stir evenly, transfer to an autoclave and react at 200-300°C for 10 hours, cool, wash, dry, and magnetically separate to obtain nano-iron tetroxide;

[0012] Magnetic separation is to remove non-magnetic components by magnetic separation technology to obtain nano-iron tetroxide;

[0013] (2) Add the nano-iron tetroxide obtained in step (1) to anhydrous ethanol, disperse it by ultrasonication, then add 0.1 mol / L sodium hydroxide to adjust the pH of the solution to 11, add tetraethyl silicate, react at 50°C for 12 hours, then add methacryloxypropyltrimethoxysilane and stir in a water bath at 40°C for 3-4 hours to obtain a composite filler.

[0014] Preferably, the method for preparing the low-temperature resistant copolymer specifically comprises the following steps:

[0015] S1. Add 2-methyl-1,3-butadiene to a n-hexane solution, add 1,3-butadiene and β-farnesene, add 0.16 mol% CuBr / Bpy as a catalyst, stir evenly, and obtain a mixed solution;

[0016] S2. The mixed solution obtained in S1 is transferred to a reactor, and the mixture is stirred at a constant temperature under nitrogen protection, and anhydrous ethanol in an amount 3 times the volume of the mixed solution is added to terminate the reaction, and the mixture is cooled, filtered, washed, and dried to obtain a low-temperature resistant copolymer.

[0017] Preferably, in S1, the amount of 2-methyl-1,3-butadiene added to the n-hexane solution is 0.08-0.12 g / mL.

[0018] Preferably, in S2, the reaction is stirred at a constant temperature of 50-60°C, a speed of 60-80 rpm, and a time of 4-5 h.

[0019] Preferably, in step (1), the amount of poly(4-styrenesulfonic acid-co-maleic acid) sodium salt added to ethylene glycol is 20-30 mg / mL.

[0020] Preferably, in step (2), the amount of the nano-ferroferric oxide obtained in step (1) added to anhydrous ethanol is 10-15 mg / mL.

[0021] The present invention also provides a method for preparing low-temperature resistant rubber for road wheels, which specifically comprises the following steps:

[0022] Add the low-temperature resistant copolymer and solution-polymerized styrene-butadiene rubber into a mixer, mix at 130-140°C for 3 min, then add zinc oxide and rubber antioxidant, mix at 150-160°C for 2 min, finally add composite filler, stearic acid, vulcanization accelerator and sulfur, mix at 140-150°C for 3 min to obtain the low-temperature resistant rubber for road wheels.

[0023] The beneficial effects achieved by the present invention are as follows: the present invention prepares ferroferric oxide and coats it with silicon dioxide as a composite filler to improve the thermal conductivity of the material, thereby reducing the internal temperature increase caused by poor heat dissipation performance and improving the anti-aging performance of the material. At the same time, methacryloxypropyltrimethoxysilane is used for surface modification to reduce the agglomeration of the composite filler and improve the compatibility of the composite filler with the rubber material, thereby enhancing the dispersibility of ferroferric oxide in the rubber, making the heat conduction more uniform, further improving the thermal aging performance of the material, and at the same time increasing the compatibility, thereby improving the cold resistance of the rubber; 2-methyl-1,3-butadiene, 1,3-butadiene, and β-farnesene are selected as polymerization monomers, among which the use of 1,3-butadiene makes the copolymer contain a large number of isolated double bonds, reducing the internal rotation barrier and movement activation energy of the chain segment, and the use of β-farnesene can reduce the regularity of the molecular chain, improve the movement ability of the molecular chain segment at low temperature, and improve the cold resistance, thereby obtaining a low-temperature resistant copolymer with good low-temperature resistance, and the low-temperature resistant copolymer is mixed with solution-polymerized styrene-butadiene rubber to further improve the low-temperature resistance of the rubber. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The results of tensile strength of Example 1-3 and Comparative Example 1-2 are shown in FIG.

[0025] Figure 2 The results of elongation at break of Example 1-3 and Comparative Example 1-2 are shown in FIG.

[0026] Figure 3The result diagram of the recovery rate of Example 1-3 and Comparative Example 1-2;

[0027] Figure 4 The result diagram of heat aging resistance of Example 1-3 and Comparative Example 1-2;

[0028] Figure 5 This is a flow chart of the synthesis of the low temperature resistant copolymer of Example 1.

[0029] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] Unless otherwise defined, all professional and scientific terms used herein have the same meanings as those familiar to those skilled in the art. In addition, any methods and materials similar or equivalent to those described herein may be applied to the present invention. The preferred implementation methods and materials described herein are for demonstration purposes only and are not intended to limit the content of this application.

[0032] The experimental methods in the following examples are conventional methods unless otherwise specified; the experimental materials used in the following examples are purchased from commercial channels unless otherwise specified.

[0033] Solution polymerized styrene butadiene rubber, Shanghai Gaoqiao Petrochemical Company, model: SSBRT2003.

[0034] Example 1

[0035] A low-temperature resistant rubber for a road wheel comprises the following components in parts by weight: 6 parts of a composite filler, 16 parts of a low-temperature resistant copolymer, 50 parts of solution-polymerized styrene-butadiene rubber, 3 parts of zinc oxide, 1.6 parts of stearic acid, 1.8 parts of an antioxidant 124, 1.8 parts of an accelerator TMTD, and 1 part of sulfur.

[0036] The composite filler is prepared from the following components in parts by weight: 15 parts of poly(4-styrenesulfonic acid-co-maleic acid) sodium salt, 16 parts of ferric chloride hexahydrate, 45 parts of sodium acetate, 10 parts of tetraethyl silicate, and 12 parts of methacryloxypropyltrimethoxysilane.

[0037] The low-temperature resistant copolymer is prepared from the following components in parts by weight: 20 parts of 2-methyl-1,3-butadiene, 8 parts of 1,3-butadiene, and 12 parts of β-farnesene.

[0038] The preparation method of the composite filler specifically comprises the following steps:

[0039] (1) Dissolve poly(4-styrenesulfonic acid-co-maleic acid) sodium salt in ethylene glycol at an addition amount of 20 mg / mL, add ferric chloride hexahydrate and sodium acetate, stir evenly, transfer to an autoclave and react at 200°C for 10 h, cool, wash, dry, and magnetically separate to obtain nano-iron tetroxide;

[0040] (2) The nano-iron tetroxide obtained in step (1) was added to anhydrous ethanol in an amount of 10 mg / mL, and ultrasonically dispersed. Subsequently, 0.1 mol / L of sodium hydroxide was added dropwise to adjust the pH of the solution to 11, tetraethyl silicate was added, and the reaction was carried out at 50°C for 12 hours. Subsequently, methacryloxypropyltrimethoxysilane was added and stirred in a water bath at 40°C for 3 hours to obtain a composite filler.

[0041] The preparation method of the low temperature resistant copolymer specifically comprises the following steps:

[0042] S1. Add 2-methyl-1,3-butadiene in an amount of 0.08 g / mL to a n-hexane solution, add 1,3-butadiene and β-farnesene, add 0.16 mol% CuBr / Bpy as a catalyst, stir evenly, and obtain a mixed solution;

[0043] S2. The mixed solution obtained in S1 was transferred to a reactor, and the mixture was stirred at 50°C and 60 rpm for 4-5 hours under nitrogen protection. Anhydrous ethanol with a volume 3 times that of the mixed solution was added to terminate the reaction. The mixture was cooled, filtered, washed and dried to obtain a low-temperature resistant copolymer.

[0044] The present invention also provides a method for preparing low-temperature resistant rubber for road wheels, which specifically comprises the following steps:

[0045] The low-temperature resistant copolymer and solution-polymerized styrene-butadiene rubber were added into a mixer and mixed at 130°C for 3 min. Subsequently, zinc oxide and rubber antioxidant were added and mixed at 150°C for 2 min. Finally, composite filler, stearic acid, vulcanization accelerator and sulfur were added and mixed at 140°C for 3 min to obtain the low-temperature resistant rubber for road wheels.

[0046] Example 2

[0047] A low-temperature resistant rubber for a road wheel comprises the following components in parts by weight: 8 parts of a composite filler, 21 parts of a low-temperature resistant copolymer, 60 parts of solution-polymerized styrene-butadiene rubber, 5 parts of zinc oxide, 2.5 parts of stearic acid, 2.2 parts of an antioxidant 124, 2 parts of an accelerator TMTD, and 1.2 parts of sulfur.

[0048] The composite filler is prepared from the following components in parts by weight: 18 parts of poly(4-styrenesulfonic acid-co-maleic acid) sodium salt, 20 parts of ferric chloride hexahydrate, 50 parts of sodium acetate, 13 parts of tetraethyl silicate, and 16 parts of methacryloxypropyltrimethoxysilane.

[0049] The low-temperature resistant copolymer is prepared from the following components in parts by weight: 30 parts of 2-methyl-1,3-butadiene, 10 parts of 1,3-butadiene, and 16 parts of β-farnesene.

[0050] The preparation method of the composite filler specifically comprises the following steps:

[0051] (1) Dissolve poly(4-styrenesulfonic acid-co-maleic acid) sodium salt in ethylene glycol at an addition amount of 30 mg / mL, add ferric chloride hexahydrate and sodium acetate, stir evenly, transfer to an autoclave and react at 300°C for 10 hours, cool, wash, dry, and magnetically separate to obtain nano-iron tetroxide;

[0052] (2) The nano-iron tetroxide obtained in step (1) was added to anhydrous ethanol in an amount of 15 mg / mL, and ultrasonically dispersed. Subsequently, 0.1 mol / L of sodium hydroxide was added dropwise to adjust the pH of the solution to 11, tetraethyl silicate was added, and the reaction was carried out at 50°C for 12 hours. Subsequently, methacryloxypropyltrimethoxysilane was added and stirred in a water bath at 40°C for 4 hours to obtain a composite filler.

[0053] The preparation method of the low temperature resistant copolymer specifically comprises the following steps:

[0054] S1. Add 2-methyl-1,3-butadiene in an amount of 0.12 g / mL to a n-hexane solution, add 1,3-butadiene and β-farnesene, add 0.16 mol% CuBr / Bpy as a catalyst, stir evenly, and obtain a mixed solution;

[0055] S2. The mixed solution obtained in S1 was transferred to a reactor, and the mixture was stirred at 60°C and 80 rpm for 5 h under nitrogen protection. Anhydrous ethanol with a volume 3 times that of the mixed solution was added to terminate the reaction. The mixture was cooled, filtered, washed and dried to obtain a low-temperature resistant copolymer.

[0056] The present invention also provides a method for preparing low-temperature resistant rubber for road wheels, which specifically comprises the following steps:

[0057] The low-temperature resistant copolymer and solution-polymerized styrene-butadiene rubber were added into a mixer and mixed at 140°C for 3 min. Subsequently, zinc oxide and rubber antioxidant were added and mixed at 160°C for 2 min. Finally, composite filler, stearic acid, vulcanization accelerator and sulfur were added and mixed at 150°C for 3 min to obtain the low-temperature resistant rubber for road wheels.

[0058] Example 3

[0059] A low-temperature resistant rubber for a road wheel comprises the following components in parts by weight: 7 parts of a composite filler, 19 parts of a low-temperature resistant copolymer, 55 parts of solution-polymerized styrene-butadiene rubber, 4 parts of zinc oxide, 2 parts of stearic acid, 2 parts of an antioxidant 124, 1.9 parts of an accelerator TMTD, and 1.05 parts of sulfur.

[0060] The composite filler is prepared from the following components in parts by weight: 16 parts of poly(4-styrenesulfonic acid-co-maleic acid) sodium salt, 18 parts of ferric chloride hexahydrate, 48 parts of sodium acetate, 12 parts of tetraethyl silicate, and 14 parts of methacryloxypropyltrimethoxysilane.

[0061] The low-temperature resistant copolymer is prepared from the following components in parts by weight: 25 parts of 2-methyl-1,3-butadiene, 9 parts of 1,3-butadiene, and 14 parts of β-farnesene.

[0062] The preparation method of the composite filler specifically comprises the following steps:

[0063] (1) Dissolve poly(4-styrenesulfonic acid-co-maleic acid) sodium salt in ethylene glycol at an addition amount of 25 mg / mL, add ferric chloride hexahydrate and sodium acetate, stir evenly, transfer to an autoclave and react at 250°C for 10 h, cool, wash, dry, and magnetically separate to obtain nano-iron tetroxide;

[0064] (2) The nano-iron tetroxide obtained in step (1) was added to anhydrous ethanol in an amount of 12.5 mg / mL, and ultrasonically dispersed. Subsequently, 0.1 mol / L of sodium hydroxide was added dropwise to adjust the pH of the solution to 11, tetraethyl silicate was added, and the reaction was carried out at 50°C for 12 hours. Subsequently, methacryloxypropyltrimethoxysilane was added and stirred in a water bath at 40°C for 3.5 hours to obtain a composite filler.

[0065] The preparation method of the low temperature resistant copolymer specifically comprises the following steps:

[0066] S1. Add 2-methyl-1,3-butadiene in an amount of 0.1 g / mL to a n-hexane solution, add 1,3-butadiene and β-farnesene, add 0.16 mol% CuBr / Bpy as a catalyst, stir evenly, and obtain a mixed solution;

[0067] S2. The mixed solution obtained in S1 was transferred to a reactor, and the mixture was stirred at 55°C and 70 rpm for 4-5 hours under nitrogen protection. Anhydrous ethanol with a volume 3 times that of the mixed solution was added to terminate the reaction. The mixture was cooled, filtered, washed and dried to obtain a low-temperature resistant copolymer.

[0068] The present invention also provides a method for preparing low-temperature resistant rubber for road wheels, which specifically comprises the following steps:

[0069] The low-temperature resistant copolymer and solution-polymerized styrene-butadiene rubber were added into a mixer and mixed at 135°C for 3 min. Subsequently, zinc oxide and rubber antioxidant were added and mixed at 155°C for 2 min. Finally, composite filler, stearic acid, vulcanization accelerator and sulfur were added and mixed at 145°C for 3 min to obtain the low-temperature resistant rubber for road wheels.

[0070] Comparative Example 1

[0071] This comparative example provides a rubber, which is different from Example 1 only in that the composite filler is replaced by ferrosoferric oxide, and the other components and component contents are the same as those in Example 1.

[0072] Comparative Example 2

[0073] This comparative example provides a rubber, which is different from Example 1 only in that the β-farnesene monomer in the low-temperature resistant copolymer is replaced by 1,3-butadiene, and the other components and component contents are the same as those in Example 1.

[0074] Experimental example

[0075] 1. Mechanical properties test

[0076] The tensile properties of Examples 1-3 and Comparative Examples 1-2 were tested using a single-filament strength meter to evaluate their mechanical properties. Ten samples of each type were taken, the tensile speed was 10 mm / min, the gauge length was 10 mm, the tensile strength and elongation at break were recorded each time, and the average was taken as the tensile strength and elongation at break of the sample.

[0077] Figure 1 The tensile strength results of Examples 1-3 and Comparative Examples 1-2 are shown in the figure. As shown in the figure, the tensile strengths of Examples 1-3 are 55.1 MPa, 55.5 MPa, and 55.3 MPa, respectively, and the tensile strengths of Comparative Examples 1-2 are 30.2 MPa and 37.6 MPa, respectively; the tensile strengths of Examples 1-3 are significantly higher than that of Comparative Example 1, indicating that the use of composite fillers improves the tensile strength of the material, and the tensile strengths of Examples 1-3 are significantly higher than that of Comparative Example 2, indicating that the use of β-farnesene improves the tensile strength of the material.

[0078] Figure 2 It is a result graph of the elongation at break of Examples 1-3 and Comparative Example 1-2. As shown in the figure, the elongations at break of Examples 1-3 are 563.2%, 566.9% and 563.5%, respectively, and the elongations at break of Comparative Example 1-2 are 432.3% and 394.6%, respectively; the elongations at break of Examples 1-3 are significantly higher than that of Comparative Example 1, indicating that the use of the composite filler improves the elongation at break of the material, and the tensile strength of Examples 1-3 is significantly higher than the elongation at break of Comparative Example 2, indicating that the use of β-farnesene improves the elongation at break of the material.

[0079] 2. Low temperature resistance test

[0080] The samples of Examples 1-3 and Comparative Examples 1-2 were compressed to 80% of the initial height, and then placed in a low temperature environment of -30°C for 12 hours, and then the load was removed. The height of the sample was measured 2 hours after the load was removed and recorded as the final height. The recovery rate was calculated using the following formula:

[0081] Response rate = final height / initial height × 100%;

[0082] Figure 3 It is a result graph of the recovery rates of Examples 1-3 and Comparative Examples 1-2. As shown in the figure, the recovery rates of Examples 1-3 are 98.3%, 98.6% and 98.8%, respectively, and the recovery rates of Comparative Examples 1-2 are 90.2% and 88.3%, respectively. The recovery rates of Examples 1-3 are significantly higher than those of Comparative Example 1, indicating that the use of composite fillers improves the recovery rate of the material. The recovery rates of Examples 1-3 are significantly higher than those of Comparative Example 2, indicating that the use of β-farnesene improves the recovery rate of the material.

[0083] 3. Heat aging resistance test

[0084] The rubber prepared in Examples 1-3 of the present invention and Comparative Examples 1-2 was cut into samples with a length of 15 cm, a width of 0.5 cm and a height, and placed on a heating table for heat aging at 180° C.×6 h. After the aging, the tensile strength was tested and its change rate was calculated.

[0085] Figure 4 The graph is a result of the heat aging resistance test of Examples 1-3 of the present invention and Comparative Examples 1-2. The change rates of the tensile strength of Examples 1-3 are -3.9%, -3.6%, and -3.5%, respectively, and the change rates of the tensile strength of Comparative Examples 1 and 2 are -13.1% and -12.6%, respectively.

[0086] Figure 5 This is a flow chart of the synthesis of the low-temperature resistant copolymer of Example 1. As shown in the figure, the low-temperature resistant copolymer is obtained by polymerizing three monomers: 2-methyl-1,3-butadiene, 1,3-butadiene and β-farnesene, and contains a large number of isolated double bonds.

[0087] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

[0088] The present invention and its implementation methods are described above, which is not restrictive. The drawings are only one of the implementation methods of the present invention, and the actual application is not limited thereto. In short, if ordinary technicians in the field are inspired by it and design methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A low temperature resistant rubber for road wheels, characterized in that: The invention comprises the following components in parts by weight: 6-8 parts of composite filler, 16-21 parts of low temperature resistant copolymer, 50-60 parts of solution polymerized styrene-butadiene rubber, 3-5 parts of zinc oxide, 1.6-2.5 parts of stearic acid, 1.8-2.2 parts of rubber antioxidant, 1.8-2 parts of vulcanization accelerator and 1-1.2 parts of sulfur; The composite filler is prepared from the following components in parts by weight: 15-18 parts of poly(4-styrenesulfonic acid-co-maleic acid) sodium salt, 16-20 parts of ferric chloride hexahydrate, 45-50 parts of sodium acetate, 10-13 parts of tetraethyl silicate, and 12-16 parts of methacryloxypropyltrimethoxysilane; The low-temperature resistant copolymer is prepared from the following components in parts by weight: 20-30 parts of 2-methyl-1,3-butadiene, 8-10 parts of 1,3-butadiene, and 12-16 parts of β-farnesene.

2. The low temperature resistant rubber for road wheels according to claim 1, characterized in that: The rubber antioxidant is one of antioxidant 124, antioxidant 4010NA, antioxidant 4020, and antioxidant H; the vulcanization accelerator is one of accelerator TMTD, accelerator NA-22, accelerator M, and accelerator NS.

3. A method for preparing low temperature resistant rubber for road wheels according to claim 2, characterized in that: The specific steps include: Add the low-temperature resistant copolymer and solution-polymerized styrene-butadiene rubber into a mixer, mix at 130-140°C for 3 min, then add zinc oxide and rubber antioxidant, mix at 150-160°C for 2 min, finally add composite filler, stearic acid, vulcanization accelerator and sulfur, mix at 140-150°C for 3 min to obtain the low-temperature resistant rubber for road wheels.

4. The method for preparing low temperature resistant rubber for road wheels according to claim 3, characterized in that: The preparation method of the low temperature resistant copolymer specifically comprises the following steps: S1. Add 2-methyl-1,3-butadiene to a n-hexane solution, add 1,3-butadiene and β-farnesene, add 0.16 mol% CuBr / Bpy as a catalyst, stir evenly, and obtain a mixed solution; S2. The mixed solution obtained in S1 is transferred to a reactor, and the mixture is stirred at a constant temperature under nitrogen protection, and anhydrous ethanol in an amount 3 times the volume of the mixed solution is added to terminate the reaction, and the mixture is cooled, filtered, washed, and dried to obtain a low-temperature resistant copolymer.

5. The method for preparing low temperature resistant rubber for road wheels according to claim 4, characterized in that: The preparation method of the composite filler specifically comprises the following steps: (1) Dissolve poly(4-styrenesulfonic acid-co-maleic acid) sodium salt in ethylene glycol, add ferric chloride hexahydrate and sodium acetate, stir evenly, transfer to an autoclave and react at 200-300°C for 10 hours, cool, wash, dry, and magnetically separate to obtain nano-iron tetroxide; (2) Add the nano-iron tetroxide obtained in step (1) to anhydrous ethanol, disperse it by ultrasonication, then add 0.1 mol / L sodium hydroxide to adjust the pH of the solution to 11, add tetraethyl silicate, react at 50°C for 12 hours, then add methacryloxypropyltrimethoxysilane and stir in a water bath at 40°C for 3-4 hours to obtain a composite filler.

6. The method for preparing low temperature resistant rubber for road wheels according to claim 5, characterized in that: In S1, the amount of 2-methyl-1,3-butadiene added to the n-hexane solution is 0.08-0.12 g / mL.

7. The method for preparing low temperature resistant rubber for road wheels according to claim 6, characterized in that: In S2, the reaction is stirred at a constant temperature of 50-60°C, a speed of 60-80 rpm, and a time of 4-5 h.

8. The method for preparing low temperature resistant rubber for road wheels according to claim 7, characterized in that: In step (1), the amount of poly(4-styrenesulfonic acid-co-maleic acid) sodium salt added to ethylene glycol is 20-30 mg / mL.

9. The method for preparing low temperature resistant rubber for road wheels according to claim 8, characterized in that: In step (2), the amount of the nano-ferroferric oxide obtained in step (1) added to anhydrous ethanol is 10-15 mg / mL.

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