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CN-121989596-A - Integrated vulcanization self-repairing safety tire

CN121989596ACN 121989596 ACN121989596 ACN 121989596ACN-121989596-A

Abstract

The invention relates to the technical field of self-repairing tires and discloses an integrally vulcanized self-repairing safety tire which sequentially comprises an isolating film, a self-repairing layer, an airtight layer, a transition layer, cord fabric, a steel wire layer, a nylon belt layer and tread rubber from inside to outside, wherein the self-repairing layer consists of a self-repairing rubber material, and the self-repairing rubber material comprises, by mass, 65-85 parts of a rubber matrix, 5-9 parts of tackifying resin, 7-12 parts of modified polyurethane, 2-6 parts of modified white carbon black, 2-3 parts of an anti-aging agent and 1-2 parts of an auxiliary agent.

Inventors

  • JIANG KAI
  • ZHU YUAN

Assignees

  • 无锡安睿驰科技有限公司

Dates

Publication Date
20260508
Application Date
20260211

Claims (10)

  1. 1. An integrally vulcanized self-repairing safety tire is characterized by sequentially comprising an isolating film, a self-repairing layer, an airtight layer, a transition layer, cord fabrics, a steel wire layer, a nylon belt ply layer and tread rubber from inside to outside; The self-repairing layer consists of self-repairing rubber; The self-repairing rubber comprises, by mass, 65-85 parts of a rubber matrix, 5-9 parts of tackifying resin, 7-12 parts of modified polyurethane, 2-6 parts of modified white carbon black, 2-3 parts of an anti-aging agent and 1-2 parts of an auxiliary agent.
  2. 2. The integrally vulcanized self-repairing safety tire according to claim 1, wherein in the self-repairing rubber material, the rubber matrix consists of natural rubber and butyl rubber in a mass ratio of 3:2, the tackifying resin consists of terpene resin and hydrogenated C5 petroleum resin in a mass ratio of 6:1, the anti-aging agent consists of anti-aging agent 4020 and anti-aging agent RD in a mass ratio of 2:1, and the auxiliary agent consists of vulcanizing agent sulfur, accelerator N-cyclohexyl-2-benzothiazole sulfenamide and active agent zinc stearate in a mass ratio of 2:3:10.
  3. 3. The integrally vulcanized self-repairing safety tire according to claim 1, wherein the preparation method of the modified white carbon black comprises the steps of dispersing white carbon black into deionized water by ultrasonic, adding gamma-mercaptopropyl trimethoxysilane after uniform dispersion, wherein the mass ratio of the white carbon black to the deionized water to the gamma-mercaptopropyl trimethoxysilane is 100 (1200-2000) (1-5), stirring and mixing, heating, adjusting the pH to 9-12 by using ammonia water, reacting for 2-4 hours at 70-80 ℃, filtering after the reaction is finished, washing by using absolute ethyl alcohol and deionized water, and drying for 12 hours at 60 ℃ to obtain the modified white carbon black.
  4. 4. The integrally vulcanized self-repairing safety tire according to claim 1, wherein the preparation method of the modified polyurethane in the self-repairing rubber material comprises the following steps: S1, carrying out vacuum degassing treatment on a halloysite nanotube at 120 ℃ for 6 hours, cooling after the treatment is finished to obtain a pretreated halloysite nanotube, carrying out ultrasonic dispersion on the pretreated halloysite nanotube into toluene, adding gamma-glycidoxypropyl triethoxysilane after uniform dispersion, heating, stirring and mixing in a nitrogen atmosphere, reacting, carrying out suction filtration, washing, and drying at 60 ℃ for 12 hours to obtain an epoxidized halloysite nanotube; S2, adding an epoxidized halloysite nanotube into N, N-dimethylformamide, uniformly dispersing by ultrasonic, adding 4,4' -diaminodiphenyl sulfone, stirring and mixing, heating for reaction, and performing rotary evaporation after the reaction is finished to obtain an aminated halloysite nanotube; S3, reacting the aminated halloysite nanotube and isophorone diisocyanate at 80-90 ℃ for 1h, cooling to 75 ℃, adding polypropylene glycol 2000, reacting for 2h, adding 2, 2-bis (hydroxymethyl) propionic acid, stirring and mixing, reacting for 2h at 80-90 ℃, adding 1, 4-butanediol and trimethylolpropane, reacting for 2h, cooling, adding triethylamine, reacting for 30-40min at 30-40 ℃, dropwise adding deionized water, shearing and emulsifying at high speed, standing, and vacuum drying at 50 ℃ for 24h to obtain the modified polyurethane.
  5. 5. The integrally vulcanized self-repairing safety tire according to claim 4, wherein the mass ratio of N, N-dimethylformamide, epoxidized halloysite nanotubes and 4,4' -diaminodiphenyl sulfone in S2 is (1000-1200): 100 (90-112), the reaction temperature is 90-105 ℃, and the reaction time is 5-8h.
  6. 6. The integrally vulcanized self-repairing safety tire according to claim 4, wherein the mass ratio of the aminated halloysite nanotube, isophorone diisocyanate, polypropylene glycol 2000, 2-bis (hydroxymethyl) propionic acid, 1, 4-butanediol, trimethylolpropane and triethylamine in the S3 is 100 (65-82): (280-350): (12-18): (8-12): (2.5-3.5): (10-16).
  7. 7. The integrally cured self-repairing tire according to any one of claims 1 to 6, wherein the process for preparing the integrally cured self-repairing tire comprises the steps of: Step one, uniformly mixing the self-repairing rubber on an internal mixer and an open mill to obtain a self-repairing layer; Cleaning a tire forming drum, removing dust and greasy dirt on the surface, attaching an isolation film to the inner side of the release surface on the tire forming drum, sequentially attaching a self-repairing layer, an airtight layer, a transition layer, cord fabric, a steel wire layer, a nylon belt layer and tread rubber to the outer side of the isolation film from inside to outside, compacting by using a compression roller, pressing according to the outline of the crown of the tire, trimming excessive rubber, preparing a green tire of the tire, and standing the green tire of the tire for 1-2h; And thirdly, placing the green tire of the tire in a dual-mold tire vulcanizing machine, vulcanizing, demolding, trimming and cooling after the vulcanizing is finished, and obtaining the integrally vulcanized self-repairing safety tire.
  8. 8. The integrally vulcanized self-repairing safety tire according to claim 7, wherein the preparation method of the self-repairing layer in the first step comprises the steps of adding a rubber matrix, an anti-aging agent, zinc stearate and modified white carbon black into an internal mixer, mixing for 2-4min at 70-90 ℃, adding tackifying resin and modified polyurethane, continuously mixing for 2-3min at 100-120 ℃, discharging rubber to obtain a master batch, wrapping a roll on an open mill at a roll temperature of 50-60 ℃, sequentially adding an accelerator N-cyclohexyl-2-benzothiazole sulfenamide and a vulcanizing agent sulfur, carrying out open mill at a temperature of 60-70 ℃ and a rotating speed of 25-35r/min, repeatedly turning over in the open mill process, and discharging sheets after uniform dispersion to obtain the self-repairing layer.
  9. 9. The integrally cured self-repairing safety tire according to claim 7, wherein the bonding temperature in the second step is 50-60 ℃, the pressure of the pressing roller is 0.5-0.8MPa, the bonding pressure is 1.0-1.2MPa, and the bonding time is 5-8min.
  10. 10. The integrally vulcanized self-repairing safety tire according to claim 7, wherein the vulcanizing process in the step three is carried out in a nitrogen atmosphere, the vulcanizing pressure is 1.8-2.2MPa, the vulcanizing temperature is 155-165 ℃, and the vulcanizing time is 20-30min.

Description

Integrated vulcanization self-repairing safety tire Technical Field The invention relates to the technical field of self-repairing tires, in particular to an integrally vulcanized self-repairing safety tire. Background With the rapid development of social economy, automobiles become mainstream travel tools, and requirements of people on safety and reliability of the automobiles are continuously upgraded, and particularly, higher standards are put forward for the performance of a tire, namely a core safety component. The traditional pneumatic tire is easy to be punctured by sharp objects such as nails, glass fragments and the like in the driving process, so that the vehicle is anchored halfway, the travel efficiency is influenced, malignant traffic safety accidents such as tire burst and the like can be possibly caused, and the life and property safety of drivers and passengers is directly threatened. The self-repairing tire has the advantages that the self-repairing tire can automatically repair tiny damages on the surface of the tire after being punctured by virtue of the self-repairing material and the self-repairing mechanism, is sealed independently, can continue to run without additional repair, provides a new solution for solving the problem, becomes an important direction for upgrading the tire technology, can effectively prolong the service life of the tire, improves the safety performance of road running, and has wide application prospect. The vulcanization process is a core link of tire production, and directly affects the structural strength, wear resistance and service life of the tire. The existing self-repairing tire is produced by adopting a step-by-step process of vulcanizing the tire body and compounding the tire body with the self-repairing layer, and the technology has the characteristic of simple technology, but the self-repairing layer and the tire matrix are combined only through secondary bonding, so that the interface strength is low, layering and stripping are easy to occur under the long-term dynamic load, temperature change and fatigue action, the self-repairing function is invalid, and the technology has low production efficiency. In order to realize the tight combination of the self-repairing layer and the tire matrix and avoid later falling off failure, the production process adopts an integrated vulcanization mode, the self-repairing layer is placed in the tire in advance, and the self-repairing layer and other parts of the tire are synchronously subjected to a high-temperature high-pressure vulcanization process. However, the self-repairing layer is in direct contact with the tire matrix in the vulcanization process, adhesion is very easy to occur due to molecular diffusion, so that defects such as adhesive shortage and scratches appear on the inner surface of the tire, and meanwhile, the structural integrity of the self-repairing layer is damaged, so that the self-healing function is attenuated, and the air tightness and the service life are influenced. Therefore, there is a need to develop a self-repairing safety tire that adapts to an integrated vulcanization process, and provides a self-repairing safety tire with excellent comprehensive performance by optimizing material properties and treatment processes. Disclosure of Invention In order to solve the technical problems, the invention provides an integrally vulcanized self-repairing safety tire, which improves the safety and service life of the tire and solves the problem that a self-repairing layer and a tire matrix in the self-repairing tire are easy to delaminate. In order to achieve the aim, the invention discloses an integrally vulcanized self-repairing safety tire which sequentially comprises an isolating film, a self-repairing layer, an airtight layer, a transition layer, cord fabric, a steel wire layer, a nylon belt ply and tread rubber from inside to outside; The self-repairing layer consists of self-repairing rubber; The self-repairing rubber comprises, by mass, 65-85 parts of a rubber matrix, 5-9 parts of tackifying resin, 7-12 parts of modified polyurethane, 2-6 parts of modified white carbon black, 2-3 parts of an anti-aging agent and 1-2 parts of an auxiliary agent. Preferably, the inner liner, the cord fabric, the steel wire layer, the nylon belt layer and the tread rubber are prepared by adopting a conventional radial tire matrix structure according to the existing tire matrix forming process. Preferably, the isolating film is a PET film coated with silicone oil on the surface. Preferably, the transition layer is made of styrene-butadiene rubber material and maleic anhydride grafted styrene-butadiene rubber with the mass ratio of 100:3, and the transition layer has the functions of relieving performance difference among the self-repairing layer, the inner liner and the cord fabric, enhancing the bonding strength among all layers and preventing layering and debonding in the vulcanization process. The self-r