A method and application of using modified polyamide fiber to enhance tire impact resistance
Through the combination of modified polyamide fiber and rubber, the problem of insufficient impact resistance of traditional tires under severe impact is solved, and the impact resistance and tear resistance of the tires are significantly improved, ensuring the integrity and service life of the tires.
Patent Information
- Application Number
- CN202411854474.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-04-04
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Traditional tires have poor impact resistance when facing severe impacts and are prone to damage, which affects driving safety and service life, especially when impacted by uneven roads or curbs.
By selecting polyamide raw materials, melt spinning and pretreatment, modified polyamide fibers are obtained, and chemical treatment and performance detection are used to introduce specific functional groups to enhance the compatibility of the fiber and rubber, mix and make tire rubber containing modified polyamide fibers through a kneading and vulcanization process.
It significantly improves the impact resistance of the tire, optimizes the tear resistance of rubber, resists impact and deformation, avoids damage and breakage of rubber and cords, and ensures the integrity of the tire.
Smart Images
Figure CN119751932A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of tire manufacturing, and specifically relates to a method and application of enhancing the impact resistance of a tire by utilizing modified polyamide fibers. Background Art
[0002] With the continuous development of the automobile industry, higher and higher performance requirements are placed on tires, especially impact resistance. Traditional tires have poor impact resistance and may be damaged when facing severe impacts, affecting driving safety and tire service life. Especially for low-profile tires, when facing impacts such as uneven roads or curbstones, the sidewalls and shoulders of the tires are squeezed by the outer edge of the rim and the impacting object at the moment of impact, resulting in large instantaneous deformation in a short period of time, and even instantaneous shearing at the outer edge of the rim, thereby damaging the rubber and the inner cord of the wheel, resulting in damage to the tire appearance or even air leakage, posing a threat to the life and property safety of the driver and others. Summary of the invention
[0003] The present invention provides a method and application of enhancing the impact resistance of a tire by using modified polyamide fibers, so as to solve at least one of the technical problems mentioned above.
[0004] In order to solve the above technical problems, the present invention discloses a method and application of using modified polyamide fiber to enhance the impact resistance of tires, the method comprising the following steps: S1. Selecting polyamide raw materials based on preset tire reinforcement performance; S2, melt-spinning the polyamide raw material to obtain polyamide fiber, and pre-treating the polyamide fiber to remove surface impurities; S3, chemically treating the polyamide fiber from which surface impurities are removed, and performing performance testing and screening to obtain modified polyamide fiber that meets the requirements; S4. The modified polyamide fiber is mixed with the rubber according to the addition amount, and a specific functional group is introduced to enhance the compatibility of the modified polyamide fiber and the rubber, promote the interface bonding between the two, and through the mixing and vulcanization process steps, a tire rubber containing the modified polyamide fiber is prepared.
[0005] Preferably, the preset tire enhancement performance includes any one or more of strength, wear resistance, impact resistance and high temperature resistance.
[0006] Preferably, the chemical treatment of the polyamide fiber to remove surface impurities comprises: S31, using a preset chemical reagent to perform surface treatment on the polyamide fiber from which surface impurities have been removed, thereby introducing active groups; S32, performing a grafting reaction to graft the molecules having enhanced properties onto the surface of the polyamide fiber; S33, drying the polyamide fiber to remove excess water and chemical reagents.
[0007] Preferably, the modified polyamide fiber is mixed with the rubber according to a preset ratio, and the added amount of the modified polyamide fiber is between 10% and 20%.
[0008] Preferably, step S4 further comprises determining the addition amount of the modified polyamide fiber: S41, preparing tire rubber samples containing modified polyamide fibers with different polyamide fiber addition amounts; S42, non-uniformly cutting the tire rubber samples for each polyamide fiber addition amount to form a plurality of tire rubber performance test samples for each polyamide fiber addition amount; S43, respectively, performing performance tests and cost analysis on a number of tire rubber performance test samples for each polyamide fiber addition amount, and obtaining impact resistance performance values, wear resistance performance values, grip performance values and manufacturing costs corresponding to the number of tire rubber performance test samples; S44, inputting the data of several tire rubber performance test samples with each polyamide fiber addition amount into the trained impact resistance performance evaluation model, wear resistance performance evaluation model, grip performance evaluation model and manufacturing cost prediction model, and obtaining the impact resistance performance evaluation value, wear resistance performance evaluation value, grip performance evaluation value and manufacturing cost prediction value corresponding to the several tire rubber performance test samples; Among them, the data of several tire rubber performance test samples with polyamide fiber addition amount, including polyamide fiber addition amount, tire rubber performance test sample weight, tire rubber performance test sample volume, tire rubber performance test sample composition and composition ratio; S45. Based on the impact resistance values, wear resistance values, grip performance values and manufacturing costs of several tire rubber performance test samples with each polyamide fiber addition amount, and the impact resistance performance evaluation values, wear resistance performance evaluation values, grip performance evaluation values and manufacturing cost prediction values, a comprehensive performance evaluation matrix of the tire rubber samples with each polyamide fiber addition amount is constructed, and the addition amount of the modified polyamide fiber is determined based on the comprehensive performance evaluation matrix of the tire rubber samples with each polyamide fiber addition amount.
[0009] Preferably, step S45 includes: S451. Construct a comprehensive performance evaluation matrix for tire rubber samples at each polyamide fiber addition amount; S452, based on the tire rubber sample comprehensive performance evaluation matrix for each polyamide fiber addition amount, obtaining a tire rubber sample comprehensive performance evaluation value for each polyamide fiber addition amount; S453. Filter out the polyamide fiber addition amounts corresponding to the tire rubber samples whose comprehensive performance evaluation values of each polyamide fiber addition amount are greater than the preset tire rubber sample comprehensive performance evaluation value, and filter out the polyamide fiber addition amounts corresponding to the tire rubber samples with the lowest manufacturing cost as the addition amounts of the modified polyamide fibers.
[0010] Preferably, a comprehensive performance evaluation matrix of tire rubber samples with each polyamide fiber addition amount is constructed: (1); among which, is the comprehensive performance evaluation matrix of tire rubber samples with the i-th polyamide fiber addition amount, is the impact resistance value corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the impact resistance value corresponding to the second tire rubber performance test sample with the i-th polyamide fiber addition amount, is the impact resistance value corresponding to the nth tire rubber performance test sample with the i-th polyamide fiber addition amount, is the wear resistance value corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the wear resistance value corresponding to the second tire rubber performance test sample with the i-th polyamide fiber addition amount, is the wear resistance value corresponding to the nth tire rubber performance test sample with the i-th polyamide fiber addition amount, is the grip performance value corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the grip performance value corresponding to the second tire rubber performance test sample with the i-th polyamide fiber addition amount, is the grip performance value corresponding to the nth tire rubber performance test sample with the i-th polyamide fiber addition amount, is the manufacturing cost corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the manufacturing cost of the second tire rubber performance test sample with the i-th amount of polyamide fiber added, is the manufacturing cost of the nth tire rubber performance test sample with the i-th polyamide fiber addition amount, is the impact resistance evaluation value corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the impact resistance evaluation value corresponding to the second tire rubber performance test sample with the i-th polyamide fiber addition amount, is the impact resistance evaluation value corresponding to the nth tire rubber performance test sample with the i-th polyamide fiber addition amount, is the wear resistance evaluation value corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the wear resistance evaluation value corresponding to the second tire rubber performance test sample with the i-th polyamide fiber addition amount, is the wear resistance evaluation value corresponding to the nth tire rubber performance test sample with the i-th polyamide fiber addition amount, is the grip performance evaluation value corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the grip performance evaluation value corresponding to the second tire rubber performance test sample with the i-th polyamide fiber addition amount, is the grip performance evaluation value corresponding to the nth tire rubber performance test sample with the i-th polyamide fiber addition amount, is the manufacturing cost prediction value corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the manufacturing cost prediction value corresponding to the second tire rubber performance test sample with the i-th polyamide fiber addition amount, It is the predicted value of manufacturing cost corresponding to the nth tire rubber performance test sample with the i-th polyamide fiber addition amount.
[0011] Preferably, the modified polyamide fiber exists in the rubber in the form of short fiber monofilaments visible to the naked eye, with a length of 0-10 mm.
[0012] An application of using modified polyamide fiber to enhance the impact resistance of a tire, wherein the modified polyamide fiber is mixed with rubber in a preset ratio to prepare a tire rubber containing the modified polyamide fiber, and the tire rubber material containing the modified polyamide fiber is applied to the sidewall of the tire.
[0013] Preferably, the modified polyamide fiber is mixed with rubber according to a preset ratio, and the mixing process includes the following steps: S5, one-stage mixing: add raw rubber, activator, plasticizer, carbon black, white carbon black and coupling agent into the internal mixer, press the top plug for 30-60 seconds, lift the weight for 10-20 seconds, press the top plug to 155℃±3℃ to discharge the rubber; S6, second stage mixing: add the first stage mixed rubber, antioxidant, carbon black, white carbon black and coupling agent into the internal mixer, press the top plug for 30 to 60 seconds, lift the weight for 10 to 20 seconds, press the top plug to 155℃±3℃ to discharge the rubber; S7, three-stage mixing: add vulcanizing agent, vulcanization accelerator and vulcanization regulator into the internal mixer, press the top bolt for 30 to 40 seconds, lift the weight for 10 to 20 seconds, press the top bolt to 100℃±3℃ to discharge the glue.
[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a method for applying modified polyamide fiber to tire rubber. Through specific modification treatment, the polyamide fiber and rubber can be better combined, the impact resistance of the tire is significantly improved, the combination of the modified material and the rubber material optimizes the tear resistance of the rubber, resists impact and deformation, avoids damage and breakage of the rubber and the cord, and ensures the integrity of the tire. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 The present invention is a schematic diagram of an application structure of utilizing modified polyamide fiber to enhance the impact resistance of a tire.
[0016] In the figure: 1, tire; 100, sidewall part. DETAILED DESCRIPTION
[0017] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.
[0018] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.
[0019] The present invention provides the following embodiments Example 1 The embodiment of the present invention provides a method and application of using modified polyamide fiber to enhance the impact resistance of tires, such as Figure 1 As shown, the method for enhancing the impact resistance of a tire by using modified polyamide fiber comprises the following steps: S1. Selecting polyamide raw materials based on preset tire reinforcement performance; S2, melt-spinning the polyamide raw material to obtain polyamide fiber, and pre-treating the polyamide fiber to remove surface impurities; S3, chemically treating the polyamide fiber from which surface impurities are removed, and performing performance testing and screening to obtain modified polyamide fiber that meets the requirements; S4. The modified polyamide fiber is mixed with the rubber according to the addition amount, and a specific functional group is introduced to enhance the compatibility of the modified polyamide fiber and the rubber, promote the interface bonding between the two, and through the mixing and vulcanization process steps, a tire rubber containing the modified polyamide fiber is prepared.
[0020] Preferably, the preset tire enhancement performance includes any one or more of strength, wear resistance, impact resistance and high temperature resistance.
[0021] Preferably, the modified polyamide fiber is mixed with the rubber according to a preset ratio, and the added amount of the modified polyamide fiber is between 10% and 20%.
[0022] Preferably, the modified polyamide fiber exists in the rubber in the form of short fiber monofilaments visible to the naked eye, with a length of 0-10 mm.
[0023] The working principle and beneficial effects of the above technical solution are as follows: the present invention provides a method for applying modified polyamide fiber to tire rubber, through specific modification treatment, the polyamide fiber and rubber can be better combined, the impact resistance of the tire is significantly improved, the combination of the modified material and the rubber material optimizes the tear resistance of the rubber, resists impact and deformation, avoids damage and breakage of the rubber and the cord, and ensures the integrity of the tire; Specifically include: Improved tire impact resistance: Modified polyamide fiber has high strength and toughness, and can effectively absorb and disperse impact force, thereby improving the tire's impact resistance and reducing tire damage and failure during driving; Improve tire wear resistance: Modified polyamide fiber has good wear resistance, which can reduce tire wear during use and extend the service life of the tire; Reduce tire weight: The density of modified polyamide fiber is low. Using modified polyamide fiber can reduce the weight of tires, thereby reducing vehicle fuel consumption and exhaust emissions; Improve tire handling performance while reducing rolling resistance: After modified polyamide fiber is added to rubber, it can increase the modulus of rubber and reduce heat generation, thereby improving vehicle handling and reducing rolling resistance.
[0024] Example 2 Based on Example 1, the chemical treatment of the polyamide fiber to remove surface impurities includes: S31, using a preset chemical reagent to perform surface treatment on the polyamide fiber from which surface impurities have been removed, thereby introducing active groups; S32, performing a grafting reaction to graft the molecules having enhanced properties onto the surface of the polyamide fiber; S33, drying the polyamide fiber to remove excess water and chemical reagents.
[0025] The working principle and beneficial effects of the above technical solution are as follows: chemically treating the polyamide fiber, introducing active groups and reinforcing molecules, effectively improving the surface properties of the fiber, and the fiber after the reinforcement treatment can better combine with the rubber matrix, thereby improving the structural stability and durability of the composite material.
[0026] Example 3 Based on Example 1, step S4 further includes determining the addition amount of the modified polyamide fiber: S41, preparing tire rubber samples containing modified polyamide fibers with different polyamide fiber addition amounts; S42, non-uniformly cutting the tire rubber samples for each polyamide fiber addition amount to form a plurality of tire rubber performance test samples for each polyamide fiber addition amount; S43, respectively, performing performance tests and cost analysis on a number of tire rubber performance test samples for each polyamide fiber addition amount, and obtaining impact resistance performance values, wear resistance performance values, grip performance values and manufacturing costs corresponding to the number of tire rubber performance test samples; S44, inputting the data of several tire rubber performance test samples with each polyamide fiber addition amount into the trained impact resistance performance evaluation model, wear resistance performance evaluation model, grip performance evaluation model and manufacturing cost prediction model, and obtaining the impact resistance performance evaluation value, wear resistance performance evaluation value, grip performance evaluation value and manufacturing cost prediction value corresponding to the several tire rubber performance test samples; Among them, the data of several tire rubber performance test samples with polyamide fiber addition amount, including polyamide fiber addition amount, tire rubber performance test sample weight, tire rubber performance test sample volume, tire rubber performance test sample composition and composition ratio; S45. Based on the impact resistance values, wear resistance values, grip performance values and manufacturing costs of several tire rubber performance test samples with each polyamide fiber addition amount, and the impact resistance performance evaluation values, wear resistance performance evaluation values, grip performance evaluation values and manufacturing cost prediction values, a comprehensive performance evaluation matrix of the tire rubber samples with each polyamide fiber addition amount is constructed, and the addition amount of the modified polyamide fiber is determined based on the comprehensive performance evaluation matrix of the tire rubber samples with each polyamide fiber addition amount.
[0027] The working principle and beneficial effects of the above technical solution are as follows: through a series of experiments and performance tests, the optimal addition amount of modified polyamide fiber is determined, and combined with performance data and cost analysis, the utilization efficiency of the material is optimized to ensure the best overall performance of the tire.
[0028] Example 4 Based on Example 3, step S45 includes: S451. Construct a comprehensive performance evaluation matrix for tire rubber samples at each polyamide fiber addition amount; S452, based on the tire rubber sample comprehensive performance evaluation matrix for each polyamide fiber addition amount, obtaining a tire rubber sample comprehensive performance evaluation value for each polyamide fiber addition amount; S453. Filter out the polyamide fiber addition amounts corresponding to the tire rubber samples whose comprehensive performance evaluation values of each polyamide fiber addition amount are greater than the preset tire rubber sample comprehensive performance evaluation value, and filter out the polyamide fiber addition amounts corresponding to the tire rubber samples with the lowest manufacturing cost as the addition amounts of the modified polyamide fibers.
[0029] The working principle and beneficial effects of the above technical solution: By constructing and evaluating a performance evaluation matrix, the effects of different polyamide fiber addition amounts on tire rubber performance can be systematically analyzed, which helps to quantify tire performance and accurately determine the amount of modified polyamide fiber added. At the same time, the polyamide fiber addition amount corresponding to the tire rubber sample with the lowest manufacturing cost can be screened out. As the amount of modified polyamide fiber added, the tire manufacturing cost can be controlled to the maximum extent while ensuring tire performance.
[0030] Example 5 Based on Example 4, a comprehensive performance evaluation matrix of tire rubber samples with each polyamide fiber addition amount was constructed: (1); among which, is the comprehensive performance evaluation matrix of tire rubber samples with the i-th polyamide fiber addition amount, is the impact resistance value corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the impact resistance value corresponding to the second tire rubber performance test sample with the i-th polyamide fiber addition amount, is the impact resistance value corresponding to the nth tire rubber performance test sample with the i-th polyamide fiber addition amount, is the wear resistance value corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the wear resistance value corresponding to the second tire rubber performance test sample with the i-th polyamide fiber addition amount, is the wear resistance value corresponding to the nth tire rubber performance test sample with the i-th polyamide fiber addition amount, is the grip performance value corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the grip performance value corresponding to the second tire rubber performance test sample with the i-th polyamide fiber addition amount, is the grip performance value corresponding to the nth tire rubber performance test sample with the i-th polyamide fiber addition amount, is the manufacturing cost corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the manufacturing cost of the second tire rubber performance test sample with the i-th amount of polyamide fiber added, is the manufacturing cost of the nth tire rubber performance test sample with the i-th polyamide fiber addition amount, is the impact resistance evaluation value corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the impact resistance evaluation value corresponding to the second tire rubber performance test sample with the i-th polyamide fiber addition amount, is the impact resistance evaluation value corresponding to the nth tire rubber performance test sample with the i-th polyamide fiber addition amount, is the wear resistance evaluation value corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the wear resistance evaluation value corresponding to the second tire rubber performance test sample with the i-th polyamide fiber addition amount, is the wear resistance evaluation value corresponding to the nth tire rubber performance test sample with the i-th polyamide fiber addition amount, is the grip performance evaluation value corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the grip performance evaluation value corresponding to the second tire rubber performance test sample with the i-th polyamide fiber addition amount, is the grip performance evaluation value corresponding to the nth tire rubber performance test sample with the i-th polyamide fiber addition amount, is the manufacturing cost prediction value corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the manufacturing cost prediction value corresponding to the second tire rubber performance test sample with the i-th polyamide fiber addition amount, It is the predicted value of manufacturing cost corresponding to the nth tire rubber performance test sample with the i-th polyamide fiber addition amount.
[0031] The working principle and beneficial effects of the above technical solution are: to construct a comprehensive performance evaluation matrix under each fiber addition amount in detail to ensure accurate evaluation of all relevant performance indicators, which is helpful to optimize material formulation and improve product quality and production efficiency.
[0032] Example 6 Based on Example 1, an application of using modified polyamide fiber to enhance the impact resistance of a tire includes mixing the modified polyamide fiber with rubber in a preset ratio to make a tire rubber containing the modified polyamide fiber, and applying the tire rubber material containing the modified polyamide fiber to the sidewall portion 100 of the tire 1.
[0033] Preferably, the modified polyamide fiber is mixed with rubber according to a preset ratio, and the mixing process includes the following steps: S5, one-stage mixing: add raw rubber, activator, plasticizer, carbon black, white carbon black and coupling agent into the internal mixer, press the top plug for 30-60 seconds, lift the weight for 10-20 seconds, press the top plug to 155℃±3℃ to discharge the rubber; S6, second stage mixing: add the first stage mixed rubber, antioxidant, carbon black, white carbon black and coupling agent into the internal mixer, press the top plug for 30 to 60 seconds, lift the weight for 10 to 20 seconds, press the top plug to 155℃±3℃ to discharge the rubber; S7, three-stage mixing: add vulcanizing agent, vulcanization accelerator and vulcanization regulator into the internal mixer, press the top bolt for 30 to 40 seconds, lift the weight for 10 to 20 seconds, press the top bolt to 100℃±3℃ to discharge the glue.
[0034] The working principle and beneficial effects of the above technical solution are as follows: the modified polyamide fiber is applied to the sidewall of the tire to improve the impact resistance of this key area, and a multi-stage mixing process is adopted to ensure that the material achieves the best physical and chemical properties during the processing, which can be well used to resist deformation or tearing caused by squeezing between the rim and the road surface at the moment of impact.
[0035] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
Claims
1. A method for enhancing the impact resistance of a tire by using modified polyamide fiber, characterized in that: The following steps are involved: S1. Selecting polyamide raw materials based on preset tire reinforcement performance; S2, melt-spinning the polyamide raw material to obtain polyamide fiber, and pre-treating the polyamide fiber to remove surface impurities; S3, chemically treating the polyamide fiber from which surface impurities are removed, and performing performance testing and screening to obtain modified polyamide fiber that meets the requirements; S4. The modified polyamide fiber is mixed with the rubber according to the addition amount, and a specific functional group is introduced to enhance the compatibility of the modified polyamide fiber and the rubber, promote the interface bonding between the two, and through the mixing and vulcanization process steps, a tire rubber containing the modified polyamide fiber is prepared.
2. The method for enhancing the impact resistance of tires by using modified polyamide fibers according to claim 1, characterized in that: The preset tire enhancement performance includes any one or more of strength, wear resistance, impact resistance and high temperature resistance.
3. The method for enhancing the impact resistance of tires by using modified polyamide fibers according to claim 1, characterized in that: Chemical treatment of polyamide fibers to remove impurities from their surface includes: S31, using a preset chemical reagent to perform surface treatment on the polyamide fiber from which surface impurities have been removed, thereby introducing active groups; S32, performing a grafting reaction to graft the molecules having enhanced properties onto the surface of the polyamide fiber; S33, drying the polyamide fiber to remove excess water and chemical reagents.
4. The method for enhancing the impact resistance of tires by using modified polyamide fibers according to claim 1, characterized in that: The modified polyamide fiber is mixed with the rubber in a preset ratio, and the added amount of the modified polyamide fiber is between 10% and 20%.
5. The method for enhancing the impact resistance of tires by using modified polyamide fibers according to claim 1, characterized in that: Step S4 also includes determining the amount of modified polyamide fiber added: S41, preparing tire rubber samples containing modified polyamide fibers with different polyamide fiber addition amounts; S42, non-uniformly cutting the tire rubber samples for each polyamide fiber addition amount to form a plurality of tire rubber performance test samples for each polyamide fiber addition amount; S43, respectively, performing performance tests and cost analysis on a number of tire rubber performance test samples for each polyamide fiber addition amount, and obtaining impact resistance performance values, wear resistance performance values, grip performance values and manufacturing costs corresponding to the number of tire rubber performance test samples; S44, inputting the data of several tire rubber performance test samples with each polyamide fiber addition amount into the trained impact resistance performance evaluation model, wear resistance performance evaluation model, grip performance evaluation model and manufacturing cost prediction model, and obtaining the impact resistance performance evaluation value, wear resistance performance evaluation value, grip performance evaluation value and manufacturing cost prediction value corresponding to the several tire rubber performance test samples; Among them, the data of several tire rubber performance test samples with polyamide fiber addition amount, including polyamide fiber addition amount, tire rubber performance test sample weight, tire rubber performance test sample volume, tire rubber performance test sample composition and composition ratio; S45. Based on the impact resistance values, wear resistance values, grip performance values and manufacturing costs of several tire rubber performance test samples with each polyamide fiber addition amount, and the impact resistance performance evaluation values, wear resistance performance evaluation values, grip performance evaluation values and manufacturing cost prediction values, a comprehensive performance evaluation matrix of the tire rubber samples with each polyamide fiber addition amount is constructed, and the addition amount of the modified polyamide fiber is determined based on the comprehensive performance evaluation matrix of the tire rubber samples with each polyamide fiber addition amount.
6. The method for enhancing the impact resistance of tires by using modified polyamide fibers according to claim 5, characterized in that: Step S45 includes: S451. Construct a comprehensive performance evaluation matrix for tire rubber samples at each polyamide fiber addition amount; S452, based on the tire rubber sample comprehensive performance evaluation matrix for each polyamide fiber addition amount, obtaining a tire rubber sample comprehensive performance evaluation value for each polyamide fiber addition amount; S453. Filter out the polyamide fiber addition amounts corresponding to the tire rubber samples whose comprehensive performance evaluation values of each polyamide fiber addition amount are greater than the preset tire rubber sample comprehensive performance evaluation value, and filter out the polyamide fiber addition amounts corresponding to the tire rubber samples with the lowest manufacturing cost as the addition amounts of the modified polyamide fibers.
7. The method for enhancing the impact resistance of tires by using modified polyamide fibers according to claim 6, characterized in that: Construct a comprehensive performance evaluation matrix for tire rubber samples with each polyamide fiber addition amount: (1); among which, is the comprehensive performance evaluation matrix of tire rubber samples with the i-th polyamide fiber addition amount, is the impact resistance value corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the impact resistance value corresponding to the second tire rubber performance test sample with the i-th polyamide fiber addition amount, is the impact resistance value corresponding to the nth tire rubber performance test sample with the i-th polyamide fiber addition amount, is the wear resistance value corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the wear resistance value corresponding to the second tire rubber performance test sample with the i-th polyamide fiber addition amount, is the wear resistance value corresponding to the nth tire rubber performance test sample with the i-th polyamide fiber addition amount, is the grip performance value corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the grip performance value corresponding to the second tire rubber performance test sample with the i-th polyamide fiber addition amount, is the grip performance value corresponding to the nth tire rubber performance test sample with the i-th polyamide fiber addition amount, is the manufacturing cost corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the manufacturing cost of the second tire rubber performance test sample with the i-th amount of polyamide fiber added, is the manufacturing cost of the nth tire rubber performance test sample with the i-th polyamide fiber addition amount, is the impact resistance evaluation value corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the impact resistance evaluation value corresponding to the second tire rubber performance test sample with the i-th polyamide fiber addition amount, is the impact resistance evaluation value corresponding to the nth tire rubber performance test sample with the i-th polyamide fiber addition amount, is the wear resistance evaluation value corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the wear resistance evaluation value corresponding to the second tire rubber performance test sample with the i-th polyamide fiber addition amount, is the wear resistance evaluation value corresponding to the nth tire rubber performance test sample with the i-th polyamide fiber addition amount, is the grip performance evaluation value corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the grip performance evaluation value corresponding to the second tire rubber performance test sample with the i-th polyamide fiber addition amount, is the grip performance evaluation value corresponding to the nth tire rubber performance test sample with the i-th polyamide fiber addition amount, is the manufacturing cost prediction value corresponding to the first tire rubber performance test sample with the i-th polyamide fiber addition amount, is the manufacturing cost prediction value corresponding to the second tire rubber performance test sample with the i-th polyamide fiber addition amount, It is the predicted value of manufacturing cost corresponding to the nth tire rubber performance test sample with the i-th polyamide fiber addition amount.
8. The method for enhancing the impact resistance of tires by using modified polyamide fibers according to claim 1, characterized in that: The modified polyamide fiber exists in the rubber in the form of short fiber monofilaments visible to the naked eye, with a length between 0 and 10 mm.
9. An application of using modified polyamide fiber to enhance the impact resistance of tires, applied to the method of using modified polyamide fiber to enhance the impact resistance of tires as claimed in any one of claims 1 to 8, characterized in that: The modified polyamide fiber is mixed with rubber in a preset ratio to prepare a tire rubber containing the modified polyamide fiber, and the tire rubber material containing the modified polyamide fiber is applied to the sidewall portion (100) of the tire (1).
10. The use of modified polyamide fiber to enhance the impact resistance of tires according to claim 9, characterized in that: The modified polyamide fiber is mixed with rubber according to a preset ratio, and the mixing process includes the following steps: S5, one-stage mixing: add raw rubber, activator, plasticizer, carbon black, white carbon black and coupling agent into the internal mixer, press the top plug for 30-60 seconds, lift the weight for 10-20 seconds, press the top plug to 155℃±3℃ to discharge the rubber; S6, second stage mixing: add the first stage mixed rubber, antioxidant, carbon black, white carbon black and coupling agent into the internal mixer, press the top plug for 30 to 60 seconds, lift the weight for 10 to 20 seconds, press the top plug to 155℃±3℃ to discharge the rubber; S7, three-stage mixing: add vulcanizing agent, vulcanization accelerator and vulcanization regulator into the internal mixer, press the top bolt for 30 to 40 seconds, lift the weight for 10 to 20 seconds, press the top bolt to 100℃±3℃ to discharge the glue.