Lightweight new energy vehicle tire and preparation method thereof

Abstract

The application discloses a light-weight new energy automobile tire and a preparation method thereof, and belongs to the technical field of vehicle tires. The tire comprises a tread, a buffer layer, a cord layer and a tire bead; the cord layer is obtained by mixing and weaving modified aramid fiber cords, carbon fiber cords and steel wire cords, the content of the modified aramid fiber cords is not less than 70%, and the preparation method is as follows: S10: after aramid fiber is cleaned and dried, the aramid fiber is subjected to plasma treatment to obtain aramid fiber 1; S20: the aramid fiber 1 is quickly placed into a monomer solution, an initiator is added and soaked, and the aramid fiber 2 is obtained after washing and drying; S30: the aramid fiber 2 is added into a sulfur-containing silane coupling agent for soaking, and then washed and dried to obtain modified aramid fiber; and S40: at least two strands of modified aramid fiber monofilaments are twisted into a strand to obtain the modified aramid fiber cord. The tensile strength, tear strength and shape stability of the tire are effectively improved, the tire body is reduced by more than 15%, and the energy consumption of the automobile in operation is reduced.

Description

Technical Field

[0001] This application relates to a lightweight new energy vehicle tire and its manufacturing method, belonging to the field of vehicle tire technology. Background Technology

[0002] Tire carcass cords are the skeleton material in a tire, a primary reinforcing material that supports the load transmitted to the tire and maintains its shape. Key properties required for tire carcass cords include strength, adhesion, modulus, and fatigue resistance; typically, strength, adhesion, and fatigue resistance are related to tire durability.

[0003] In existing technologies, steel cords are mostly used to support the tire in its ply layer to achieve its function. While steel cords effectively improve the tire's resistance to compression and impact, the use of steel cords throughout the ply layer increases the tire's weight, causing the vehicle to consume more energy during operation. To address these issues, existing technologies have attempted to reduce tire weight by weaving aramid fibers with steel cords. However, due to the high brittleness of aramid fibers and difficulties in bonding them to the rubber matrix, the amount of aramid fibers added is relatively low. Although this reduces tire weight to some extent, the tire remains quite heavy. Furthermore, some existing technologies use carbon fiber weaving with steel cords to achieve tire lightweighting. However, the bond between carbon fiber and the rubber matrix is ​​not strong, and carbon fiber has a low elongation at break, which may lead to tearing or damage to the ply structure during use.

[0004] Therefore, there is an urgent need for a new energy vehicle tire that is lightweight, has strong tear resistance, and good stability. Summary of the Invention

[0005] To address the aforementioned issues, a lightweight new energy vehicle tire and its manufacturing method are provided. The cord layer in this lightweight new energy vehicle tire is obtained by weaving together three types of cords: modified aramid fiber cord, carbon fiber cord, and steel wire cord. This effectively improves the tire's tensile strength, tear strength, and tire shape stability, while also effectively reducing the tire's weight, improving product durability, and reducing energy consumption during vehicle operation.

[0006] One aspect of this application provides a lightweight new energy vehicle tire, comprising: a tread, a sidewall, a buffer layer, a cord layer, and a bead; The cord layer is obtained by weaving together modified aramid fiber cord, carbon fiber cord, and steel wire cord; The amount of modified aramid fiber cord added is not less than 70%; The method for preparing the modified aramid fiber cord is as follows: S10: After cleaning and drying the aramid fiber, it is subjected to plasma treatment to obtain aramid fiber 1; S20: Aramid fiber 1 is quickly placed into a monomer solution, an initiator is added, and under the protection of an inert gas, it is soaked at 50-60°C for 1-2 hours, followed by washing and drying to obtain aramid fiber 2. The monomer is selected from at least one of methyl methacrylate, ethyl acrylate, and glycidyl acrylate. S30: Add aramid fiber 2 to an aqueous solution of sulfur-containing silane coupling agent, soak at 30-40℃ for 2-3 hours, then wash and dry to obtain modified aramid fiber; S40: A modified aramid fiber cord is obtained by twisting multiple strands of modified aramid fiber monofilaments together.

[0007] By first subjecting aramid fibers to plasma treatment, high-energy particles bombard the surface of the aramid fibers, causing the surface molecular chains to break and generating free radicals or unsaturated bonds. Then, the aramid fibers 1 obtained after treatment are quickly placed into a monomer solution, and an initiator is added to trigger the free radicals on the aramid fibers 1 to attack the monomers, thereby achieving a grafting reaction between the monomers and the aramid fibers 1. This introduces alkyl and ester groups, improving the brittleness and flexibility of the aramid fibers 1.

[0008] Aramid fiber 2 is added to an aqueous solution of sulfur-containing silane coupling agent. The sulfur-containing silane coupling agent undergoes hydrolysis in the aqueous solution to generate reactive silanols that can react with some hydroxyl groups remaining on the surface of aramid fiber 2. By adjusting the pH of the aqueous solution of sulfur-containing silane coupling agent, the condensation of silanol bonds can be achieved, thus realizing the combination of sulfur-containing silane coupling agent and aramid fiber 2. This introduces sulfur groups onto aramid fiber 2. During the subsequent tire vulcanization process, the thiol groups (-SH) or disulfide bonds (-SS-) introduced on the surface of the modified aramid fiber can form covalent bonds (-CS-) with sulfur in the rubber, thereby modifying the connection strength between the aramid fiber cord and the rubber substrate.

[0009] Optionally, the specific operation of plasma treatment in step S10 is as follows: Aramid fibers are placed in a plasma generator and treated for 15-20 minutes at a pressure of 20-25 Pa, an output power of 160-180 W, and a temperature of 5-10 °C.

[0010] Plasma treatment under the above conditions can effectively attack the surface of aramid fibers, promote the generation of free radicals and hydroxyl groups on the surface, facilitate subsequent modification, and prevent aramid fibers from being over-treated, which would affect the performance of aramid fibers. It can not only promote subsequent modification but also ensure that the performance of aramid fibers is not affected.

[0011] Optionally, in step S20, the weight ratio of aramid fiber 1 to monomer is 1:(2.5-3).

[0012] When aramid fiber 1 and monomer are in this ratio, the alkyl and ester groups on the monomer can undergo free radical grafting reaction under the action of an initiator, ensuring that the monomer can be effectively grafted onto aramid fiber 1. Methyl, ethyl and ester side groups are introduced into the molecular chain of aramid fiber, and the steric hindrance is used to break the tight packing of molecular chains, reduce crystallinity, and increase the slippage ability between molecular chains. This significantly improves the flexibility of aramid fiber 1, neutralizes the brittleness of aramid fiber itself, and makes it better suited for use in tire manufacturing.

[0013] Optionally, the monomer solution concentration is 10%-15%.

[0014] When the monomer concentration is between 5% and 10%, it is beneficial to form relatively uniform graft polymer chains with a narrow molecular weight distribution. Within this concentration range, the free radical-initiated polymerization rate is relatively mild, and monomer molecules have sufficient space to uniformly graft onto the aramid fiber surface, avoiding excessive chain growth and aggregation caused by excessively high monomer concentrations. Grafting aramid fibers within this concentration range significantly improves their flexibility and effectively enhances their resistance to bending fatigue, thereby increasing the service life of aramid fibers in tires.

[0015] When the concentration is above 10%, the grafting reaction rate accelerates, and the grafting rate increases significantly. However, excessively high monomer concentrations may cause a rapid increase in the viscosity of the reaction system, hindering the diffusion of free radicals generated by initiator decomposition, resulting in excessively rapid local polymerization rates. This leads to a wider molecular weight distribution of the grafted polymer and may even result in uneven grafting. If the concentration is below 10%, the grafting reaction can proceed effectively, but due to the limited monomer content, the number of effective groups grafted onto the aramid fibers will decrease, making the modification effect on the aramid fibers less significant.

[0016] Optionally, the monomer is selected from methyl methacrylate and glycidyl acrylate in a weight ratio of 1:(1.2-1.5).

[0017] Modifying aramid fibers with a combination of methyl methacrylate and hydroxyethyl acrylate can introduce alkyl side groups, ester groups, and epoxy groups. When the epoxy groups are subsequently bonded to rubber, they react with the amino groups in the amide bonds on the surface of the aramid fibers under high temperature during vulcanization to form -CO- covalent bonds, which enhances the bonding force with the aramid fibers and improves the shear resistance of the modified aramid fibers.

[0018] Optionally, the initiator is either benzoyl peroxide or azobisisobutyronitrile.

[0019] Optionally, in step S30, the weight ratio of aramid fiber 2 to sulfur-containing silane coupling agent is 1:(2-2.5).

[0020] At this ratio, aramid fiber 2 can be better combined with sulfur-containing silane coupling agent, modifying aramid fiber 2 and introducing mercapto groups. During the vulcanization process in tire manufacturing, at the vulcanization temperature, -SH combines with the active sulfur atoms in the rubber to form stable thioether bonds. Disulfide or tetrasulfide silanes can decompose into active sulfur free radicals at high temperatures, thereby achieving combination with rubber molecular chains, improving the tightness of the connection between aramid fiber cords and rubber substrate, and improving the tear resistance and shear resistance of tires.

[0021] Optionally, the sulfur-containing silane coupling agent is at least one of 3-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, bis-[3-(triethoxysilane)propyl]-disulfide, and bis-[γ-(triethoxysilane)propyl]-tetrasulfide.

[0022] Optionally, the carbon fiber cord is obtained by twisting multiple carbon fiber monofilaments, and the diameter of the carbon fiber cord, modified aramid fiber cord, and steel wire cord is 0.40-0.60 mm.

[0023] Optionally, carbon fiber monofilaments and steel wires are soaked in a mixed solution containing resorcinol, glycerol and water for 2-4 hours, then washed, dried and twisted to obtain carbon fiber cords and steel wire cords.

[0024] Soaking carbon fiber monofilaments and steel wires in a mixed solution of resorcinol, glycerol, and water introduces phenyl and hydroxyl groups onto their surfaces. During the weaving process, carbon fiber cords, steel wire cords, and modified aramid cords are co-woven, connecting the carbon fiber cords and steel wire cords with the modified aramid cords. In subsequent tire manufacturing, the phenyl and hydroxyl groups react with the amide bonds on the aramid fibers, increasing the connection strength between the carbon fiber cords, steel wire cords, and modified aramid cords, thus improving the overall shear resistance of the tire.

[0025] Optionally, the mass ratio of resorcinol, glycerol and water is 1:(0.5-0.8):(5-7).

[0026] Optionally, the weave density of the cord layer is 40-50 EPI.

[0027] At this weave density, it can effectively provide support for the tire while also effectively reducing the tire's weight, achieving tire lightweighting, without affecting the tire's load-bearing capacity and puncture resistance.

[0028] According to another aspect of this application, a method for preparing a lightweight new energy vehicle tire is provided, comprising the following steps: S100: Rubber is mixed to obtain a compound; S200: The compounded rubber is made into the tread and sidewall. The tread, sidewall, cord layer, buffer layer and bead are combined and shaped, and then vulcanized to obtain a lightweight new energy vehicle tire.

[0029] Optionally, the vulcanization temperature is 150-180℃ and the time is 40-60 min.

[0030] The beneficial effects of this application include, but are not limited to: 1. The lightweight new energy vehicle tire according to this application has a cord layer made by mixing three types of cords: modified aramid fiber cord, carbon fiber cord, and steel wire cord. This effectively improves the tensile strength, tear strength, and shape stability of the tire, while also effectively reducing the weight of the tire, improving the durability of the product, and reducing the energy consumption of the vehicle during operation.

[0031] 2. According to the lightweight new energy vehicle tire of this application, aramid fiber is modified to introduce methyl, ethyl and ester side groups into the aramid molecular chain. The steric hindrance is used to break the tight packing of the molecular chain, reduce the crystallinity, and increase the slippage ability between molecular chains, so as to significantly improve the flexibility of the modified aramid fiber.

[0032] 3. According to the lightweight new energy vehicle tire of this application, mercapto groups are introduced on aramid fibers. During the vulcanization process in tire manufacturing, at the vulcanization temperature, -SH combines with active sulfur atoms in the rubber to form stable thioether bonds; disulfide or tetrasulfide silanes can decompose into active sulfur free radicals at high temperatures, thereby achieving combination with rubber molecular chains, improving the tightness of the connection between aramid fiber cords and rubber substrate, and improving the tire's tear resistance and shear resistance. Detailed Implementation

[0033] The present application is described in detail below with reference to the embodiments, but the present application is not limited to these embodiments.

[0034] Unless otherwise specified, the raw materials used in the embodiments and comparative examples of this application were all purchased commercially.

[0035] Unless otherwise specified, the methods used in the embodiments and comparative examples of this application are conventional methods in the prior art.

[0036] CAS No.: 80-62-6; CAS No.: 140-88-5; CAS No.: 106-90-1; CAS No.: 3-mercaptopropyltrimethoxysilane; CAS No.: 13399-93-4; CAS No.: 14814-09-6; CAS No.: bis-[3-(triethoxysilyl)propyl]-disulfide; CAS No.: 56706-10-6; CAS No.: bis-[γ-(triethoxysilyl)propyl]-tetrasulfide; CAS No.: 40372-72-3.

[0037] The solvents for methyl methacrylate, ethyl acrylate, and glycidyl acrylate solutions can be hexane, heptane, acetone, or acetonitrile. Those skilled in the art can select the appropriate solvent according to their needs.

[0038] Example 1 This embodiment relates to a lightweight new energy vehicle tire, including: tread, sidewall, buffer layer, cord layer and bead; The cord layer is made by blending modified aramid fiber cord, carbon fiber cord and steel wire cord; the carbon fiber cord is made by twisting multiple carbon fiber monofilaments. The diameter of the carbon fiber cord, modified aramid fiber cord and steel wire cord is 0.40mm and the weaving density is 40EPI.

[0039] The modified aramid fiber cord was added at a rate of 70%, the carbon fiber cord at a rate of 10%, and the steel wire cord at a rate of 20%. Carbon fiber monofilaments and steel wires are soaked in a mixed solution of resorcinol, glycerol and water in a mass ratio of 1:0.5:5 for 2 hours, then washed, dried and twisted to obtain carbon fiber cords and steel wire cords.

[0040] The preparation method of modified aramid fiber cord is as follows: S10: After cleaning and drying the aramid fiber, the aramid fiber is placed in a plasma generator and treated with argon gas at a pressure of 20 Pa and an output power of 160 W at 5 °C for 15 min to obtain aramid fiber 1. S20: Aramid fiber 1 is quickly placed into a 5% methyl methacrylate solution with a weight ratio of 1:2.5 to methyl methacrylate solution. Azobisisobutyronitrile is added at a concentration of 0.1% of the methyl methacrylate solution. The mixture is soaked at 50°C for 1 hour under nitrogen protection, followed by washing and drying to obtain aramid fiber 2. S30: Aramid fiber 2 is added to 3-mercaptopropyltrimethoxysilane at a weight ratio of 1:2. The mixture is soaked at 30°C for 2 hours, then washed and dried to obtain modified aramid fiber. S40: A modified aramid fiber cord is obtained by twisting multiple strands of modified aramid fiber monofilaments together.

[0041] This embodiment relates to a method for preparing a lightweight new energy vehicle tire, which includes the following steps: S100: 40 parts natural rubber, 50 parts chloroprene rubber, 60 parts carbon black, 1 part zinc stearate, 1 part accelerator M, 1 part antioxidant, and 1 part sulfur are mixed at 110°C to obtain a compound. S200: The compounded rubber is made into the tread and sidewall, and the tread, sidewall, cord layer, buffer layer and bead are combined and shaped, and then vulcanized at a temperature of 150℃ for 40 minutes.

[0042] Example 2 This embodiment relates to a lightweight new energy vehicle tire, comprising: a tread, a sidewall, a buffer layer, a cord layer, and a bead; The cord layer is made by blending modified aramid fiber cord, carbon fiber cord and steel wire cord; the carbon fiber cord is made by twisting multiple carbon fiber monofilaments. The diameter of the carbon fiber cord, modified aramid fiber cord and steel wire cord is 0.60mm and the weaving density is 50EPI.

[0043] The modified aramid fiber cord was added at a rate of 80%, the carbon fiber cord at a rate of 5%, and the steel wire cord at a rate of 15%. Carbon fiber monofilaments and steel wires are soaked in a mixed solution of resorcinol, glycerol and water in a mass ratio of 1:0.8:7 for 4 hours, then washed, dried and twisted to obtain carbon fiber cords and steel wire cords.

[0044] The preparation method of modified aramid fiber cord is as follows: S10: After cleaning and drying the aramid fiber, the aramid fiber is placed in a plasma generator and treated with argon gas at a pressure of 25 Pa and an output power of 180 W at 10 °C for 20 min to obtain aramid fiber 1. S20: Aramid fiber 1 is quickly placed into a 10% ethyl acrylate solution with a weight ratio of 1:3. Benzoyl peroxide is added at a concentration of 0.2% of the ethyl acrylate solution. Under nitrogen protection, the mixture is soaked at 60°C for 2 hours, then washed and dried to obtain aramid fiber 2. S30: Aramid fiber 2 is added to bis-[3-(triethoxysilane)propyl]-disulfide, the weight ratio of aramid fiber 2 to bis-[3-(triethoxysilane)propyl]-disulfide is 1:2.5, and it is soaked at 40°C for 3 hours. After washing and drying, modified aramid fiber is obtained. S40: A modified aramid fiber cord is obtained by twisting multiple strands of modified aramid fiber monofilaments together.

[0045] This embodiment relates to a method for preparing a lightweight new energy vehicle tire, which includes the following steps: S100: 40 parts natural rubber, 50 parts chloroprene rubber, 60 parts carbon black, 1 part zinc stearate, 1 part accelerator M, 1 part antioxidant, and 1 part sulfur are mixed at 110°C to obtain a compound. S200: The compounded rubber is made into the tread and sidewall, and the tread, sidewall, cord layer, buffer layer and bead are combined and shaped, and then vulcanized at a temperature of 180℃ for 60 minutes.

[0046] Example 3 This embodiment relates to a lightweight new energy vehicle tire, comprising: a tread, a sidewall, a buffer layer, a cord layer, and a bead; The cord layer is made by blending modified aramid fiber cord, carbon fiber cord and steel wire cord; the carbon fiber cord is made by twisting multiple carbon fiber monofilaments. The diameter of the carbon fiber cord, modified aramid fiber cord and steel wire cord is 0.50mm and the weaving density is 45EPI.

[0047] The modified aramid fiber cord was added at a rate of 75%, the carbon fiber cord at a rate of 10%, and the steel wire cord at a rate of 15%. Carbon fiber monofilaments and steel wires are soaked in a mixed solution of resorcinol, glycerol and water in a mass ratio of 1:0.6:6 for 3 hours, then washed, dried and twisted to obtain carbon fiber cords and steel wire cords.

[0048] The preparation method of modified aramid fiber cord is as follows: S10: After cleaning and drying the aramid fiber, the aramid fiber is placed in a plasma generator and treated with argon gas at a pressure of 23 Pa and an output power of 170 W at 8 °C for 17 min to obtain aramid fiber 1. S20: Aramid fiber 1 was quickly placed in a 10% solution of methyl methacrylate and glycidyl acrylate, with a weight ratio of methyl methacrylate to glycidyl acrylate of 1:1.2 and a weight ratio of aramid fiber 1 to methyl methacrylate and glycidyl acrylate of 1:2.8. Benzoyl peroxide was added, with the amount of benzoyl peroxide added being 0.2% of the ethyl acrylate solution. The mixture was soaked at 55°C for 2.5 hours under nitrogen protection, followed by washing and drying to obtain aramid fiber 2. S30: Aramid fiber 2 is added to bis-[3-(triethoxysilane)propyl]-disulfide, the weight ratio of aramid fiber 2 to bis-[γ-(triethoxysilane)propyl]-tetrasulfide is 1:2.3, and it is soaked at 35°C for 2.5 h. After washing and drying, modified aramid fiber is obtained. S40: A strand of modified aramid fiber monofilaments twisted together to obtain modified aramid fiber cord.

[0049] This embodiment relates to a method for preparing a lightweight new energy vehicle tire, which includes the following steps: S100: 40 parts natural rubber, 50 parts chloroprene rubber, 60 parts carbon black, 1 part zinc stearate, 1 part accelerator M, 1 part antioxidant, and 1 part sulfur are mixed at 110°C to obtain a compound. S200: The compounded rubber is made into the tread and sidewall, and the tread, sidewall, cord layer, buffer layer and bead are combined and shaped, and then vulcanized at a temperature of 170℃ for 50 minutes.

[0050] Example 4 The difference between this embodiment and embodiment 3 is that the plasma treatment in step S10 is specifically performed as follows: The aramid fiber was placed in a plasma generator and treated for 40 minutes at a pressure of 25 Pa, an output power of 180 W, and a temperature of 10 °C. The rest of the treatment was the same as in Example 3.

[0051] Example 5 The difference between this embodiment and embodiment 3 is that the concentration of the methyl methacrylate and glycidyl acrylate solution in step S20 is 20%, and the weight ratio of methyl methacrylate and glycidyl acrylate is 1:1.5. The rest is the same as in embodiment 3.

[0052] Example 6 The difference between this embodiment and embodiment 3 is that the weight ratio of the concentrations of aramid fiber 1 to the methyl methacrylate and glycidyl acrylate solutions in step S20 is 1:1.5, while the rest is the same as in embodiment 3.

[0053] Example 7 The difference between this embodiment and embodiment 3 is that the weight ratio of aramid fiber 2 to γ-mercaptopropyltriethoxysilane in step S30 is 1:1.5, while the rest is the same as in embodiment 3.

[0054] Comparative Example 1 The difference between this comparative example and Example 3 is that the modified aramid fiber accounts for 90% of the total modified aramid fiber cord, carbon fiber cord, and steel wire cord, while the rest is the same as in Example 3.

[0055] Comparative Example 2 The difference between this comparative example and Example 3 is that the cord layer is obtained by mixing single steel wire cords, while the rest is the same as Example 3.

[0056] Comparative Example 3 The difference between this comparative example and Example 3 is that the cord layer is made by weaving 50% carbon fiber and 50% steel wire cord together, while the rest is the same as in Example 3.

[0057] Comparative Example 4 The difference between this comparative example and Example 3 is that step S20 is not modified, while the rest is the same as Example 3.

[0058] Comparative Example 5 The difference between this embodiment and embodiment 3 is that step S30 is not modified, while the rest is the same as embodiment 3.

[0059] Test Example 1 For the tires obtained in the examples and comparative examples, the tensile strength and elongation were tested according to GB / T528-2008, and the tear strength was tested according to GB / T529-2008. The weight reduction ratio was tested using the following method: the weight of the tire obtained in comparative example 2 was recorded as W1, and the weight of the tires prepared in the examples and comparative examples prepared in this application was recorded as W2. The weight reduction ratio was calculated using the formula: weight reduction ratio (%) = (W1 – W2) / W1×100%. The test results are shown in the table below.

[0060] Table 1

[0061] The weight reduction rate in Comparative Example 2 in Table 1 is - because the reference tire used for calculating the weight reduction rate in this application is the tire prepared in Comparative Example 2. Therefore, the weight reduction rate of Comparative Example 2 in Table 1 is -.

[0062] Test Example 1 For the tires obtained in the examples and comparative examples, the following tests were performed: Wet skid performance: Each test tire was mounted on an all-wheel-drive vehicle, and the braking distance was measured at a first speed of 50 km / h on a wet cement road surface from the starting position. The smaller the braking distance, the better the wet skid resistance and grip of the tread compound. Rolling resistance coefficient: Tire rolling resistance is the energy loss per unit distance traveled. The tire rolling resistance coefficient is the ratio of rolling resistance expressed in Newtons to tire load expressed in Newtons. The smaller the rolling resistance coefficient, the smaller the tire rolling resistance. Hot air aging tensile aging coefficient: Tested according to GB / T3512-2014 standard. The larger the tensile aging coefficient, the better its resistance to heat and oxygen aging.

[0063] Table 2

[0064] The above description is merely an embodiment of this application, and the scope of protection of this application is not limited to these specific embodiments, but is determined by the claims of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the technical concept and principles of this application should be included within the scope of protection of this application.

Claims

1. A lightweight new energy vehicle tire, characterized in that, include: Tread, sidewall, buffer layer, cord layer, and bead; The cord layer is obtained by weaving together modified aramid fiber cord, carbon fiber cord, and steel wire cord; The modified aramid fiber cord accounts for 70%-80% of the total modified aramid fiber cord, carbon fiber cord, and steel wire cord. The method for preparing the modified aramid fiber cord is as follows: S10: After cleaning and drying the aramid fiber, it is subjected to plasma treatment to obtain aramid fiber one; S20: Aramid fiber one is rapidly placed into a monomer solution, an initiator is added, and under the protection of an inert gas, it is soaked at 50-60°C for 1-2 hours, followed by washing and drying to obtain aramid fiber two; the monomer is selected from methyl methacrylate and glycidyl acrylate in a weight ratio of 1:(1.2-1.5). The weight ratio of aramid fiber to monomer is 1:(2.5-3); the monomer solution concentration is 10%-15%. S30: Add aramid fiber II to sulfur-containing silane coupling agent, soak at 30-40℃ for 2-3 hours, then wash and dry to obtain modified aramid fiber. The weight ratio of aramid fiber II to sulfur-containing silane coupling agent is 1:(2-2.5). S40: A modified aramid fiber cord is obtained by twisting at least two strands of modified aramid fiber monofilaments together.

2. The lightweight new energy vehicle tire according to claim 1, characterized in that, The specific operations of plasma treatment in step S10 are as follows: Aramid fibers are placed in a plasma generator and treated for 15-20 minutes at a pressure of 20-25 Pa, an output power of 160-180 W, and a temperature of 5-10 °C.

3. The lightweight new energy vehicle tire according to claim 1, characterized in that, The sulfur-containing silane coupling agent is at least one of 3-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, bis-[3-(triethoxysilane)propyl]-disulfide, and bis-[γ-(triethoxysilane)propyl]-tetrasulfide.

4. The lightweight new energy vehicle tire according to claim 1, characterized in that, The carbon fiber cord is obtained by twisting at least two carbon fiber monofilaments, and the steel wire cord is obtained by twisting at least two steel wires. The diameters of the carbon fiber cord, modified aramid fiber cord, and steel wire cord are all 0.40-0.60 mm.

5. The lightweight new energy vehicle tire according to claim 4, characterized in that, The weave density of the cord layer is 40-50 EPI.

6. A method for preparing a lightweight new energy vehicle tire according to any one of claims 1-5, characterized in that, Includes the following steps: S100: Rubber is mixed to obtain a compound; S200: The compounded rubber is made into the tread and sidewall. The tread, sidewall, cord layer, buffer layer and bead are combined and shaped, and then vulcanized to obtain a lightweight new energy vehicle tire.

7. The preparation method according to claim 6, characterized in that, The vulcanization temperature is 150-180℃, and the time is 40-60 minutes.

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