Rare earth synergistic self-repairing sealant for rubber tire and preparation method thereof

Abstract

This invention discloses a rare-earth-enhanced self-healing sealant for rubber tires and its preparation method. The sealant comprises a pretreatment component and a self-healing sealant component. The pretreatment component consists of lanthanum nitrate, ammonia, polyvinyl alcohol, and a mixed solvent, used to form directionally grown rod-shaped rare-earth compounds on the inner surface of the tire, improving surface roughness and physical anchoring points. The self-healing sealant component is composed of polystyrene-butadiene-styrene, petroleum resin, epoxidized soybean oil, naphthenic oil, antioxidant, hollow microspheres, fumed silica, and polyamide wax in a specific ratio. The preparation method includes: preparing a pretreatment solution and spraying it onto the inner wall surface of the tire, drying it, and then blowing it off; mixing the sealant component using a three-roll mill, heating and stirring it to a specified viscosity, then spraying it onto the pretreated rubber tire surface and cooling to cure. This invention is suitable for medium- and low-speed rubber tires, the surface treatment process is simple and easy to operate, and the sealant has high bonding strength and leak-proof performance, enabling immediate sealing after puncture.

Description

Technical Field

[0001] This invention belongs to the field of adhesive materials technology, specifically relating to a rare earth-enhanced self-healing sealant for rubber tires and its preparation method. Background Technology

[0002] Low-speed electric bicycles are a common mode of transportation for urban and rural residents in my country, enjoying extremely high penetration and becoming an important part of daily travel. However, these models typically use tubeless tires, making them prone to punctures from road debris such as nails and glass shards. A rapid drop in tire pressure not only affects vehicle stability but can also lead to loss of control, rollovers, and other serious traffic accidents, further threatening the rider's life. Furthermore, due to the design and weight limitations of electric bicycles, they are usually not equipped with spare tires, making punctures a major pain point for users and placing higher demands on the safety, lifespan, and overall performance of tire products. Against this backdrop, self-sealing tire technology has gradually emerged. This technology integrates a special sealing layer inside the tire, which can quickly seal the puncture wound upon impact, effectively preventing gas leakage and significantly improving driving safety and convenience. It has become an important development direction in the electric bicycle tire industry.

[0003] Currently, the mainstream technology for achieving tire self-healing function involves coating or embedding a layer of polymer sealant material on the inner wall of the tire. When a sharp foreign object punctures the tread, this material can quickly flow and encapsulate the foreign object, blocking the puncture and achieving an immediate seal. While this method is simple and effective in principle, it still faces several key technical challenges in practical applications. Among these, the reliability of adhesion between the sealant and the tire inner wall is the primary difficulty. Under the complex dynamic conditions of vehicle operation, including the effects of centrifugal force, temperature fluctuations, and cyclic deformation stress, the inner wall coating must maintain strong and durable adhesion to the tire carcass. If the adhesion is insufficient, the coating may shift, peel, or even completely detach, not only causing the self-healing function to fail but also potentially disrupting the tire's dynamic balance and increasing driving hazards. Therefore, developing a sealant system that combines excellent cohesive strength and reliable interfacial adhesion is crucial.

[0004] To improve the adhesion performance of sealants, various solutions exist. First, pre-treating the inner surface of the tire rim is a common method, such as laser etching or sandblasting, to increase surface roughness and improve the adhesion of the sealant. This physical modification effectively enhances mechanical bonding, but it introduces additional production steps and costs, and improper control of process parameters may damage the tire structure or lead to uneven adhesion. Second, introducing dynamic covalent bonds, such as disulfide bonds, borate ester bonds, or imine bonds, into the sealant material allows the material to undergo reversible chemical bond breaking and recombination triggered by external stimuli (such as heat or mechanical force) after damage, achieving intrinsic self-healing. This chemical self-healing mechanism improves the material's durability, but the repair process often depends on specific conditions, such as heating; the repair rate at room temperature is limited and cannot meet the need for immediate sealing. Third, by adding nanofillers, such as modified carbon nanotubes or graphene, to construct a three-dimensional synergistic network, it is possible to significantly improve mechanical strength, modulus, and thermal stability while maintaining the material's flexibility. The application of these nanomaterials expands the applicability of sealants, but may increase material costs and processing complexity. Finally, microencapsulation technology encapsulates a repair agent within microcapsules and disperses them inside a matrix. When the material is damaged, causing the capsule to rupture, the repair agent flows out and solidifies to complete the repair. This method is simple to operate, but it is a one-time repair mechanism; once the capsule is consumed, it cannot be used for multiple repairs in the same area, and the uniform dispersion and stability control of the capsules are technical challenges.

[0005] Despite significant progress in self-sealing tire technology, several limitations remain. Firstly, the complexity of surface pretreatment processes increases manufacturing barriers, hindering large-scale production. Secondly, self-sealing based on dynamic covalent bonds relies on external stimuli, limiting its response speed in real-world driving scenarios. Furthermore, the irreversibility of microencapsulation technology cannot address the risk of repeated punctures. These shortcomings prevent existing self-sealing sealants from fully meeting market demands in terms of adhesion durability, leak-proof efficiency, and ease of application. To address these issues, a novel technological solution is needed that simplifies the pretreatment process while improving the overall performance of the sealant. Summary of the Invention

[0006] The purpose of this invention is to overcome the defects of the prior art and provide a rare earth-enhanced self-healing sealant for rubber tires.

[0007] Another object of the present invention is to provide a method for preparing the above-mentioned rare earth-enhanced self-healing sealant for rubber tires.

[0008] The technical solution of the present invention is as follows:

[0009] A rare-earth-enhanced self-healing sealant for rubber tires includes a pretreatment component and a self-healing sealing component, wherein...

[0010] The pretreatment components include lanthanum nitrate, ammonia, polyvinyl alcohol, and a mixed solvent consisting of anhydrous ethanol, isobutanol, and petroleum ether 200#.

[0011] The raw materials for the self-healing sealing component include polystyrene-butadiene-styrene, petroleum resin, epoxidized soybean oil, naphthenic oil, antioxidants, hollow microspheres, fumed silica, and polyamide wax.

[0012] In a preferred embodiment of the present invention, the mixed solvent is anhydrous ethanol, isobutanol and petroleum ether 200# mixed in a mass ratio of 50:30:20.

[0013] In a preferred embodiment of the present invention, the degree of hydrolysis of polyvinyl alcohol is 88% and the particle size is 120 mesh.

[0014] In a preferred embodiment of the present invention, the proportions of each component in the self-healing sealing component are as follows: 30-40 wt% polystyrene-butadiene-styrene, 18-27 wt% petroleum resin, 10-16.5 wt% epoxidized soybean oil, 13.5-20 wt% naphthenic oil, 1-4 wt% antioxidant, 4-10 wt% hollow microspheres, 0.5-1.0 wt% polyamide wax, and 0.5-1.5 wt% fumed silica.

[0015] The preparation method of the above-mentioned rare earth-enhanced self-healing sealant for rubber tires includes the following steps:

[0016] (1) Pretreatment of the inner surface of rubber tire: Dissolve lanthanum nitrate in a mixed solvent to prepare a solution with a concentration of 10-22%; dissolve polyvinyl alcohol in deionized water to prepare a solution with a mass percentage of 0.2-0.5%, add ammonia water with a mass percentage of 1-4% and mix evenly; fix the tire and rotate it at a speed of 10-25 r / min, spray the lanthanum nitrate solution 2-3 times, the spray amount is 1-3 g per square centimeter; then spray the polyvinyl alcohol-ammonia water solution once until the inner wall turns white, and let it air dry naturally; blow the inner wall with air at 1-2 MPa before spraying;

[0017] (2) Preparation and spraying of self-healing sealing components: Polystyrene-butadiene-styrene, petroleum resin, antioxidant, hollow microspheres and polyamide wax are mixed on a three-roll mill until transparent and uniform; fumed silica is added and mixing is continued; epoxidized soybean oil and naphthenic oil are added, and the temperature is raised to 100-120 ℃ and stirred until the viscosity is 7000-25000 CPS; the adhesive is sprayed on the pretreated inner wall of the tire at 130 ℃, and the thickness is 1.5-2 cm after rotating twice; cold air is sprayed to cool it to below 100 ℃ and then placed to cool to room temperature.

[0018] In a preferred embodiment of the present invention, the preheating temperature of the three-roll mill is 140~190 ℃, the rotation speed is 35 r / min, and the roller gap is 3~5 mm.

[0019] In a preferred embodiment of the present invention, the stirring in step (2) is performed at a low speed of 20-50 r / min.

[0020] In a preferred embodiment of the present invention, the spraying in step (2) is performed using a flat-nozzle glue gun device with heating function, by means of air extrusion.

[0021] The beneficial effects of this invention are:

[0022] 1. This invention utilizes the synergistic effect of rare earth compounds on the surface of rubber tires to increase surface roughness and form physical anchoring points, thereby promoting the wetting and spreading effect of self-healing sealant, providing more microscopic contact points and hydrogen bonding, while enhancing interfacial interaction forces, realizing a combined bonding mechanism, improving overall adhesion reliability and durability, and making it suitable for complex dynamic driving environments.

[0023] 2. The addition of hollow microspheres in this invention can reduce the density of the colloid, increase the coverage volume under the same mass, and improve the porous structure inside the colloid layer. This solves the problem of the colloid layer not being solid, reduces the probability of external gas entering, effectively prevents air leakage, ensures that the tire maintains airtightness after puncture, and improves driving safety and service life.

[0024] 3. This invention adopts a simple rare earth functionalization process, which eliminates the need for traditional roughening, blowing or cleaning operations on the inner surface of the tire. It is compatible with various release materials and rubber types, is simple to operate, low in cost, provides an efficient and economical solution, and is convenient for industrial production and promotion.

[0025] 4. The sealant system of the present invention maintains excellent bonding strength and sealing performance under alternating high and low temperature environments, has good anti-sagging and construction adaptability, meets market demands under different climatic conditions, and enhances the overall competitiveness of the product. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the self-healing sealant in Embodiment 3 of the present invention, showing the overall appearance and structural features of the sealant.

[0027] Figure 2 This is a schematic diagram illustrating the puncture resistance and air leakage prevention effect of the self-healing sealant applied to rubber tires in Embodiment 3 of the present invention, showing the process by which the sealant quickly seals the wound and prevents gas leakage after puncture.

[0028] Figure 3This is a schematic diagram of the effect of driving 5000 km after a rubber tire is punctured in Embodiment 3 of the present invention, which shows the sealing performance and tire integrity of the sealant after medium mileage.

[0029] Figure 4 This is a schematic diagram of the effect of a rubber tire driven for 15,000 km after being punctured in Embodiment 3 of the present invention, demonstrating the long-lasting sealing performance of the sealant and the tire durability after long-distance use.

[0030] Figure 5 This is a schematic diagram of rare earth pretreatment on the inner wall surface of a rubber tire in Embodiment 1 of the present invention, showing the rod-shaped micro / nano structure formed by the directional growth of rare earth compounds on the inner wall of the tire during the pretreatment process. Detailed Implementation

[0031] The technical solution of the present invention will be further explained and described below with reference to specific embodiments and accompanying drawings.

[0032] The anhydrous lanthanum nitrate in the following examples is an anhydrous white powder with a purity of 5N and a particle size D. 90 The thickness is 25μm, and it was purchased from Jinshilan (Xiamen) New Materials Co., Ltd.

[0033] Example 1: Pretreatment of the inner surface of a rubber tire:

[0034] (1) Under normal temperature conditions, anhydrous lanthanum nitrate was dissolved in a mixed solvent (anhydrous ethanol, isobutanol and petroleum ether 200# were prepared in a mass ratio of 50:30:20) to prepare a lanthanum nitrate solution with a concentration of 15wt%.

[0035] (2) Using deionized water as a diluent, polyvinyl alcohol with a degree of hydrolysis of 88% and a particle size of 120 mesh was dissolved into a solution with a mass percentage of 0.4%. After complete dissolution, 2% ammonia water was added and stirred evenly to obtain a polyvinyl alcohol-ammonia water mixed solution for later use. Polyvinyl alcohol is used to promote the directional growth of rare earth compounds, and ammonia water is used to adjust the pH value of the reaction.

[0036] (3) Use special equipment to fix the tire, adjust the speed to 15 r / min, and spray lanthanum nitrate solution while the tire is rotating. Spray 2-3 times, with a spray amount of about 2 g per square centimeter.

[0037] (4) Then, under the same rotation speed, continue to spray the polyvinyl alcohol-ammonia water mixture solution once until a white precipitate appears on the inner wall of the tire. Stop rotating and place the tire in a room temperature environment of 27 ℃ to air dry naturally for 24 h.

[0038] (5) Before spraying the self-healing sealant, use air at a pressure of 1 MPa to blow the inner wall of the tire to remove residual solvent and lanthanum hydroxide powder that is easy to fall off the surface.

[0039] like Figure 5 As shown in the diagram, the surface pretreatment process forms rare earth compounds on the inner wall surface of a rubber tire, demonstrating a directionally grown rod-like structure.

[0040] Example 2

[0041] (1) Preheat the three-roll mill to 190 °C, start the rotation speed at 35 r / min, and set the roller gap to 4 mm; then, add 30 g of polystyrene-butadiene-styrene, 27 g of petroleum resin C5 (H5-1001, purchased from Henghe Materials Technology Co., Ltd.), 1 g of antioxidant (Irganox® 1010, purchased from BASF), and 8 g of D 90 70 μm hollow microspheres (purchased from Zhengzhou Shenglait) and 0.5 g polyamide wax (AC316A, purchased from Honeywell) were repeatedly mixed until the mixture was transparent and homogeneous.

[0042] (2) Slowly add 1.5 g of fumed silica (A200, purchased from Evonik) to the above mixture, continue to mix until the mixture is transparent and uniform again, discharge and transfer to the heating cylinder.

[0043] (3) Add 12 g of epoxidized soybean oil (purchased from Kuanfang Chemical) and 20 g of naphthenic oil (KN4006, purchased from Karamay, Xinjiang) to the heating cylinder, heat to 100 ℃, and stir at a low speed of 35 r / min until the viscosity of the adhesive solution is measured to be 8900 CPS using the flow cup method, indicating that the adhesive solution is mixed evenly.

[0044] (4) The above-mentioned adhesive is injected into a flat-nozzle glue gun device with heating function. At a temperature of 130 °C, the adhesive is uniformly sprayed onto the inner wall of the tire after surface pretreatment in Example 1 by air extrusion. The glue injection rate is matched with the tire rotation speed. After the tire rotates two times, the adhesive layer thickness is 1.5 cm.

[0045] (5) After the adhesive is applied, immediately spray cold air onto the adhesive surface until the temperature of the adhesive surface drops below 100 ℃ to complete the spraying process. Move the tire into a constant temperature room and place it for 24 hours to cool to room temperature, thus completing the entire construction process.

[0046] Example 3

[0047] (1) Preheat the three-roll mill to 160 ℃, start the rotation speed at 50 r / min, and set the roller gap to 3 mm; then, add 35 g of polystyrene-butadiene-styrene, 18 g of petroleum resin C9 hydrogenated (Guang Shen 4522, purchased from Shandong Guang Shen Electronic Technology Co., Ltd.), 2 g of antioxidant (Irganox® 1010, purchased from BASF), and 10 g of D 90 100 μm hollow microspheres (purchased from Zhengzhou Shenglait) and 0.7 g polyamide wax (AC316A, purchased from Honeywell) were repeatedly mixed until the mixture was transparent and homogeneous.

[0048] (2) In the above mixture, slowly add 1 g of fumed silica (A200, purchased from Evonik), continue to mix until the mixture is transparent and uniform again, discharge and transfer to the heating cylinder.

[0049] (3) Add 16.3 g of epoxidized soybean oil (purchased from Kuanfang Chemical) and 17 g of naphthenic oil (KN4006, purchased from Karamay, Xinjiang) to the heating cylinder, heat to 120 ℃, and stir at a low speed of 50 r / min until the viscosity of the adhesive solution is measured to be 15500 CPS using the flow cup method, indicating that the adhesive solution is evenly mixed.

[0050] (4) The above-mentioned adhesive is injected into a flat-nozzle glue gun device with heating function. At a temperature of 130 °C, the adhesive is uniformly sprayed onto the inner wall of the tire after surface pretreatment in Example 1 by air extrusion. The glue injection rate is matched with the tire rotation speed. After the tire rotates two revolutions, the adhesive layer thickness is 1.8 cm.

[0051] (5) After the adhesive is applied, immediately spray cold air onto the adhesive surface until the temperature of the adhesive surface drops below 100 ℃ to complete the spraying process. Move the tire into a constant temperature room and place it for 24 hours to cool to room temperature, thus completing the entire construction process.

[0052] like Figure 1 The image shown is the appearance of the self-healing sealant in this embodiment; as shown... Figure 2 As shown, this embodiment demonstrates the puncture resistance and leak-proof effect of the self-healing sealant applied to rubber tires; as Figure 3 The image shows the effect of driving 5000km after the rubber tire in this embodiment was punctured; as shown... Figure 4 The image shows the effect of driving 15,000 km after the rubber tire in this embodiment was punctured.

[0053] Example 4

[0054] (1) Preheat the three-roll mill to 140 ℃, start the rotation speed at 20 r / min, and set the roller gap to 5 mm; then, add 40 g of polystyrene-butadiene-styrene, 22 g of terpene resin (CAS: 9003-74-1, purchased from Jinan Shanhai Chemical Technology Co., Ltd.), 4 g of antioxidant (Irganox® 1010, purchased from BASF), and 4 g of D 90 60 μm hollow microspheres (purchased from Zhengzhou Shenglait) and 1 g polyamide wax (AC316A, purchased from Honeywell) were repeatedly mixed until the mixture was transparent and homogeneous.

[0055] (2) Slowly add 0.5 g of fumed silica (A200, purchased from Evonik) to the above mixture, continue to mix until the mixture is transparent and uniform again, discharge and transfer to the heating cylinder.

[0056] (3) Add 15 g of epoxidized soybean oil (purchased from Kuanfang Chemical) and 13.5 g of naphthenic oil (KN4006, purchased from Karamay, Xinjiang) to the heating cylinder, heat to 110 ℃, and stir at a low speed of 20 r / min until the viscosity of the adhesive solution is measured to be 7000-25000 CPS using the flow cup method, indicating that the adhesive solution is mixed evenly.

[0057] (4) The above-mentioned adhesive is injected into a flat-nozzle glue gun device with heating function. At a temperature of 130 °C, the adhesive is sprayed evenly onto the inner wall of the tire after surface pretreatment in Example 1 by air extrusion. The glue injection rate is matched with the tire rotation speed. After the tire rotates two times, the adhesive layer thickness is 2 cm.

[0058] (5) After the adhesive is applied, immediately spray cold air onto the adhesive surface until the temperature of the adhesive surface drops below 100 ℃ to complete the spraying process. Move the tire into a constant temperature room and place it for 24 hours to cool to room temperature, thus completing the entire construction process.

[0059] Comparative Example 1

[0060] The self-healing sealant was sprayed directly onto the inner surface of the rubber tire without performing the surface pretreatment described in Example 1.

[0061] (1) Preheat the three-roll mill to 160 ℃, start the rotation speed at 50 r / min, and set the roller gap to 3 mm; then, add 35 g of polystyrene-butadiene-styrene, 18 g of petroleum resin C9 hydrogenated (4522, purchased from Shandong Guangshen Electronic Technology Co., Ltd.), 2 g of antioxidant (Irganox® 1010, purchased from BASF), and 10 g of D 90 100 μm hollow microspheres (purchased from Zhengzhou Shenglait) and 0.7 g polyamide wax (AC316A, purchased from Honeywell) were repeatedly mixed until the mixture was transparent and homogeneous.

[0062] (2) In the above mixture, slowly add 1 g of fumed silica (A200, purchased from Evonik), continue to mix until the mixture is transparent and uniform again, discharge and transfer to the heating cylinder.

[0063] (3) Add 16.3 g of epoxidized soybean oil (purchased from Kuanfang Chemical) and 17 g of naphthenic oil (KN4006, purchased from Karamay, Xinjiang) to the heating cylinder, heat to 120 ℃, and stir at a low speed of 50 r / min until the viscosity of the adhesive solution is measured to be 15500 CPS using the flow cup method, indicating that the adhesive solution is evenly mixed.

[0064] (4) The above-mentioned adhesive is injected into a flat-nozzle glue gun device with heating function. At a temperature of 130 ℃, the adhesive is evenly sprayed onto the inner wall of the tire by air extrusion. The glue injection rate is matched with the tire rotation speed. After the tire rotates two times, the adhesive layer thickness is 1.8 cm.

[0065] (5) After the adhesive is applied, immediately spray cold air onto the adhesive surface until the temperature of the adhesive surface drops below 100 ℃ to complete the spraying process. Move the tire into a constant temperature room and place it for 24 hours to cool to room temperature, thus completing the entire construction process.

[0066] Comparative Example 2

[0067] The surface treatment is as described in Example 1.

[0068] (1) Preheat the three-roll mill to 160 ℃, start the rotation speed at 50 r / min, and set the roller gap to 3 mm; then, add 50 g of polystyrene-butadiene-styrene, 3 g of petroleum resin C9 hydrogenated (4522, purchased from Shandong Guangshen Electronic Technology Co., Ltd.), 2 g of antioxidant (Irganox® 1010, purchased from BASF), and 10 g of D 90 100 μm hollow microspheres (purchased from Zhengzhou Shenglait) and 0.7 g polyamide wax (AC316A, purchased from Honeywell) were repeatedly mixed until the mixture was transparent and homogeneous.

[0069] (2) In the above mixture, slowly add 1 g of fumed silica (A200, purchased from Evonik), continue to mix until the mixture is transparent and uniform again, discharge and transfer to the heating cylinder.

[0070] (3) Add 16.3 g of epoxidized soybean oil (purchased from Kuanfang Chemical) and 17 g of naphthenic oil (KN4006, purchased from Karamay, Xinjiang) to the heating cylinder, heat to 120 ℃, and stir at a low speed of 50 r / min until the viscosity of the adhesive solution measured by the flow cup method is 35500 CPS, indicating that the adhesive solution is evenly mixed.

[0071] (4) The above-mentioned adhesive is injected into a flat-nozzle glue gun device with heating function. At a temperature of 130 ℃, the adhesive is evenly sprayed onto the inner wall of the tire by air extrusion. The glue injection rate is matched with the tire rotation speed. After the tire rotates two times, the adhesive layer thickness is 1.7 cm.

[0072] (5) After the adhesive is applied, immediately spray cold air onto the adhesive surface until the temperature of the adhesive surface drops below 100 ℃ to complete the spraying process. Move the tire into a constant temperature room and place it for 24 hours to cool to room temperature, thus completing the entire construction process.

[0073] Comparative Example 3

[0074] The surface treatment is as described in Example 1.

[0075] (1) Preheat the three-roll mill to 160 ℃, start the rotation speed at 50 r / min, and set the roller gap to 3 mm; then, add 20 g of polystyrene-butadiene-styrene, 18 g of petroleum resin C9 hydrogenated (4522, purchased from Shandong Guangshen Electronic Technology Co., Ltd.), 2 g of antioxidant (Irganox® 1010, purchased from BASF), and 10 g of D 90 100 μm hollow microspheres (purchased from Zhengzhou Shenglait) and 0.7 g polyamide wax (AC316A, purchased from Honeywell) were repeatedly mixed until the mixture was transparent and homogeneous.

[0076] (2) In the above mixture, slowly add 1 g of fumed silica (A200, purchased from Evonik), continue to mix until the mixture is transparent and uniform again, discharge and transfer to the heating cylinder.

[0077] (3) Add 16.3 g of epoxidized soybean oil (purchased from Kuanfang Chemical) and 32 g of naphthenic oil (KN4006, purchased from Karamay, Xinjiang) to the heating cylinder, heat to 120 ℃, and stir at a low speed of 50 r / min until the viscosity of the adhesive solution is measured to be 5500 CPS using the flow cup method, indicating that the adhesive solution is mixed evenly.

[0078] (4) Inject the above-mentioned adhesive into a flat-nozzle glue gun device with heating function, and spray the adhesive evenly onto the inner wall of the tire by air extrusion at a temperature of 130 ℃. Match the glue injection rate with the tire rotation speed, and achieve an adhesive layer thickness of 1.6 cm after the tire rotates two times.

[0079] (5) After the adhesive is applied, immediately spray cold air onto the adhesive surface until the temperature of the adhesive surface drops below 100 ℃ to complete the spraying process. Move the tire into a constant temperature room and place it for 24 hours to cool to room temperature, thus completing the entire construction process.

[0080] Table 1 Performance results of the examples and comparative examples

[0081] Adhesion strength to rubber at room temperature (N / m) Elongation at break / % Air tightness after tack / % Air tightness after 5000km of driving with tacks / % Air tightness after 15,000 km of driving following nailing / % Example 2 782 785 99.1 98.7 97.8 Example 3 812 779 99.5 99.1 98.3 Example 4 775 768 98.7 98.0 97.1 Comparative Example 1 520 779 98.9 89.5 76.2 Comparative Example 2 602 831 97.5 90.1 87.1 Comparative Example 3 535 635 98.2 92.3 90.5

[0082] The above description is merely a preferred embodiment of the present invention, and therefore should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A rare earth-enhanced self-healing sealant for rubber tires, characterized in that: Includes pretreatment components and self-healing sealing components, among which, The pretreatment components include lanthanum nitrate, ammonia, polyvinyl alcohol, and a mixed solvent consisting of anhydrous ethanol, isobutanol, and petroleum ether 200#. The raw materials for the self-healing sealing component include polystyrene-butadiene-styrene, petroleum resin, epoxidized soybean oil, naphthenic oil, antioxidants, hollow microspheres, fumed silica, and polyamide wax.

2. The rare earth-enhanced self-healing sealant for rubber tires as described in claim 1, characterized in that: The mixed solvent is anhydrous ethanol, isobutanol and petroleum ether 200# mixed in a mass ratio of 50:30:

20.

3. The rare earth-enhanced self-healing sealant for rubber tires as described in claim 1, characterized in that: The degree of alcoholysis of polyvinyl alcohol is 88%, and the particle size is 120 mesh.

4. A rare earth-enhanced self-healing sealant for rubber tires as described in any one of claims 1 to 3, characterized in that: The proportions of each component in the self-healing sealing composition are as follows: 30-40 wt% polystyrene-butadiene-styrene, 18-27 wt% petroleum resin, 10-16.5 wt% epoxidized soybean oil, 13.5-20 wt% naphthenic oil, 1-4 wt% antioxidant, 4-10 wt% hollow microspheres, 0.5-1.0 wt% polyamide wax, and 0.5-1.5 wt% fumed silica.

5. The preparation method of the rare earth-enhanced self-healing sealant for rubber tires according to any one of claims 1 to 4, characterized in that: Includes the following steps: (1) Pretreatment of the inner surface of rubber tires: Dissolve lanthanum nitrate in a mixed solvent to prepare a solution with a concentration of 10-22%; dissolve polyvinyl alcohol in deionized water to prepare a solution with a mass percentage of 0.2-0.5%, add ammonia water with a mass percentage of 1-4% and mix evenly; fix the tire and rotate it at a speed of 10-25 r / min, spray the lanthanum nitrate solution 2-3 times, the spray amount is 1-3 g per square centimeter; then spray the polyvinyl alcohol-ammonia water solution once until the inner wall turns white, and let it air dry naturally; Before spraying, blow the inner wall with air at 1-2 MPa; (2) Preparation and spraying of self-healing sealing components: Polystyrene-butadiene-styrene, petroleum resin, antioxidant, hollow microspheres and polyamide wax are mixed on a three-roll mill until transparent and uniform; fumed silica is added and mixing is continued; epoxidized soybean oil and naphthenic oil are added, and the temperature is raised to 100-120 ℃ and stirred until the viscosity is 7000-25000 CPS; the adhesive is sprayed on the pretreated inner wall of the tire at 130 ℃, and the thickness is 1.5-2 cm after rotating twice; cold air is sprayed to cool it to below 100 ℃ and then placed to cool to room temperature.

6. The preparation method according to claim 5, characterized in that: The preheating temperature of the three-roll mill is 140~190 ℃, the rotation speed is 35 r / min, and the roller gap is 3~5 mm.

7. The preparation method according to claim 5, characterized in that: The stirring in step (2) is performed at a low speed of 20~50 r / min.

8. The preparation method according to claim 5, characterized in that: The spraying in step (2) is performed using a flat-nozzle glue gun with heating function, which is carried out by air extrusion.

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