CN118480325A - A high-strength sealing material for vehicle and preparation method thereof - Google Patents

Abstract

The invention discloses a high-strength sealing material for a vehicle and a preparation method thereof, and belongs to the technical field of sealing materials for vehicles. The method comprises the following steps: putting basalt fibers into a sodium hydroxide solution for treatment to obtain basalt fibers subjected to alkali corrosion, and then putting into a zirconate solution for treatment to obtain pretreated basalt fibers; taking polypropylene oxide propylene glycol ether for dehydration, and reacting with 4,4' -diphenylmethane diisocyanate and dibutyl tin dilaurate to obtain a prepolymer; mixing the isocyanatopropyl triethoxysilane, the polyoxypropylene propylene glycol ether, the dibutyl tin dilaurate, the zinc oxide, the active magnesium oxide, the stearic acid, the anti-aging agent, the accelerator, the pretreated basalt fiber, the reinforcing agent, the glycerol laurate and the antioxidant 1010, sealing and stirring at 80-90 ℃, and mixing with the prepolymer, the silane coupling agent A-171 and the stannous octoate to obtain the high-strength vehicle sealing material.

Description

A high-strength sealing material for vehicle and preparation method thereof

Technical Field

The invention belongs to the technical field of vehicle sealing materials, and in particular relates to a high-strength vehicle sealing material and a preparation method thereof.

Background Art

High-strength polyurethane sealants for automobiles play a vital role in the modern automobile industry. Their outstanding performance has made them widely used in the industry. Polyurethane sealants have the characteristics of high strength, good wear resistance, excellent bonding performance and tensile strength, making them an indispensable sealing material in the automobile manufacturing process. However, although polyurethane sealants perform well in many aspects, there is a significant problem in their use, that is, their poor heat aging resistance.

In the automotive industry, there is a huge demand for sealing materials, and the performance requirements are getting higher and higher. Although high-strength polyurethane sealants for automobiles have excellent performance in strength, wear resistance and bonding performance, their aging problems under high-temperature exposure environments limit their application scope. This is because the polyurethane molecular chains in high-strength polyurethane sealants for automobiles will break and deteriorate under high-temperature exposure, causing the bonds between the molecular chains to break, resulting in a decrease in the physical and chemical properties of the material, limiting its long-term stability and service life, and affecting its sealing effect.

Summary of the invention

The object of the present invention is to provide a high-strength sealing material for vehicles and a preparation method thereof. The pretreated basalt fiber is obtained by surface-treating the basalt fiber; then the prepolymer obtained by reacting with polyoxypropylene glycol ether, 4,4'-diphenylmethane diisocyanate and dibutyltin dilaurate, and isocyanatepropyltriethoxysilane, polyoxypropylene glycol ether, dibutyltin dilaurate, zinc oxide, active magnesium oxide, stearic acid, antioxidant, accelerator, pretreated basalt fiber, reinforcing agent, lauric acid glyceryl ester, antioxidant 1010, silane coupling agent A-171 and stannous octoate are mixed to obtain the high-strength sealing material for vehicles.

The technical problem to be solved by the present invention is to improve the heat aging resistance of automotive sealing materials so that they still have excellent tensile strength in complex high-temperature environments and ensure their sealing effect.

The purpose of the present invention can be achieved through the following technical solutions:

A high-strength sealing material for a vehicle and a preparation method thereof, comprising the following steps:

S1. Place basalt fiber in sodium hydroxide solution, stir in a water bath at 50-55°C for 2-3h, filter with deionized water, and dry at 80°C for 6-8h to obtain basalt fiber after alkaline etching;

S2, taking the basalt fiber after alkali etching and placing it in a zirconate solution, stirring it in a water bath at 50-55° C. for 2-3 hours, filtering it with deionized water, and drying it at 60° C. for 6-8 hours to obtain pretreated basalt fiber;

S3, put polyoxypropylene glycol ether into a reaction kettle, heat to 110°C, evacuate, dehydrate for 2-4h, cool to room temperature, add 4,4'-diphenylmethane diisocyanate and dibutyltin dilaurate, stir for 1-2h, let stand for 0.5-1h, heat to 75-85°C and react for 2-3h to obtain a prepolymer;

S4. Take isocyanate propyl triethoxysilane, polyoxypropylene glycol ether, dibutyltin dilaurate, zinc oxide, active magnesium oxide, stearic acid, antioxidant, accelerator, pretreated basalt fiber, reinforcing agent, lauric acid glyceryl, and antioxidant 1010, put them in a reaction kettle and mix them, seal and stir at 80-90°C for 8-10h, cool to room temperature, add the prepolymer, seal and stir at 40-50°C for 2-4h, add silane coupling agent A-171 and stannous octoate, vacuum stir at room temperature for 1-2h, and vacuum fill into a hose to obtain the automotive high-strength sealing material.

As a preferred technical solution of the present invention, in step S1, the dosage ratio of the basalt fiber to the sodium hydroxide solution is 2-3 g: 20-30 mL; and the concentration of the sodium hydroxide solution is 0.5 mol/L.

As a preferred technical solution of the present invention, in step S2, the dosage ratio of the alkaline-etched basalt fiber to the zirconate solution is 1.2-1.5 g: 20-30 mL; and the mass fraction of zirconate in the zirconate solution is 8-10%.

As a preferred technical solution of the present invention, in step S3, the mass ratio of polyoxypropylene glycol ether, 4,4'-diphenylmethane diisocyanate, and dibutyltin dilaurate is 100-110:16-22:0.11-0.18.

As a preferred technical solution of the present invention, the antioxidant is CUREKIND445, the main component of which is 4,4'-bis(α,α-dimethylbenzyl)diphenylamine, which was purchased from Ningbo Sulfur Polymer Co., Ltd.

As a preferred technical solution of the present invention, the reinforcing agent is any one of silicon aluminum carbon black, carbon black N330 and andalusite, and the reinforcing agent is ultrafinely ground to obtain micron-grade powder, and the particle size of the reinforcing agent is 20-30 μm.

As a preferred technical solution of the present invention, in step S4, the mass ratio of isocyanatepropyl triethoxysilane, polyoxypropylene glycol ether, dibutyltin dilaurate, zinc oxide, active magnesium oxide, stearic acid, antioxidant, accelerator, pretreated basalt fiber, reinforcing agent, lauric acid glyceryl ester, antioxidant 1010, prepolymer, silane coupling agent A-171, and stannous octoate is 3-5:90-100:0.04-0.06:15-20:3-4:2-4:3-4:8-10:15-25:4-6:0.04-0.06:2-3:60-70:2-3:0.5-0.8.

As a preferred technical solution of the present invention, the preparation of the accelerator comprises the following steps:

Selenium dioxide, anhydrous ethanol and diethylamine are mixed, stirred for 15-25 minutes, stirred in a water bath at 5-8°C for 0.5-1 hour, carbon disulfide is added, stirring is continued for 2-3 hours, filtered and dried to obtain the accelerator.

As a preferred technical solution of the present invention, the dosage ratio of selenium dioxide, anhydrous ethanol, diethylamine and carbon disulfide is 5-6g:100mL:10-15mL:6-8mL.

A high-strength sealing material for vehicles prepared by the preparation method.

Beneficial effects of the present invention:

The present invention discloses a high-strength automotive sealing material and a preparation method thereof. The basalt fibers are surface treated so that the basalt fibers are attached to the molecular surfaces of terminal isocyanate polyurethane prepolymers to form crosslinking sites, thereby increasing the degree of crosslinking and improving the tensile strength of the prepared sealing material. A promoter is introduced to react with zinc oxide to generate active selenium atoms attached to the surface of the terminal isocyanate polyurethane prepolymers, thereby increasing the crosslinking sites and enhancing the heat aging resistance of the sealing material to a certain extent, thereby ensuring that the sealing material still has a good sealing effect in a high temperature environment.

DETAILED DESCRIPTION

In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

Example 1

A method for preparing a high-strength sealing material for a vehicle comprises the following steps:

S1. Place basalt fiber in a sodium hydroxide solution, stir in a water bath at 50°C for 2h, filter with deionized water, and dry at 80°C for 6h to obtain basalt fiber after alkali etching; the ratio of basalt fiber to sodium hydroxide solution is 2g:20mL; the concentration of sodium hydroxide solution is 0.5mol/L;

S2, taking the basalt fiber after alkali etching and placing it in a zirconate solution, stirring it in a water bath at 50°C for 2h, filtering it with deionized water, and drying it at 60°C for 6h to obtain pretreated basalt fiber; the dosage ratio of the basalt fiber after alkali etching and the zirconate solution is 1.2g:20mL; the mass fraction of zirconate in the zirconate solution is 8%;

S3, put polyoxypropylene glycol ether into a reaction kettle, heat to 110°C, evacuate, dehydrate for 2h, cool to room temperature, add 4,4'-diphenylmethane diisocyanate and dibutyltin dilaurate, stir for 1h, let stand for 0.5h, heat to 75°C and react for 2h to obtain a prepolymer; the mass ratio of polyoxypropylene glycol ether, 4,4'-diphenylmethane diisocyanate and dibutyltin dilaurate is 100:16:0.11;

S4, take isocyanate propyl triethoxysilane, polyoxypropylene glycol ether, dibutyltin dilaurate, zinc oxide, active magnesium oxide, stearic acid, antioxidant, accelerator, pretreated basalt fiber, reinforcing agent, lauric acid glyceryl ester, antioxidant 1010, put them in a reaction kettle and mix them, seal and stir at 80°C for 8h, cool to room temperature, add the prepolymer, seal and stir at 40°C for 2h, add silane coupling agent A-171 and stannous octoate, vacuum stir at room temperature for 1h, and vacuum fill into a hose to obtain The high-strength sealing material for vehicles; the mass ratio of propyl triethoxysilane, polyoxypropylene glycol ether, dibutyltin dilaurate, zinc oxide, active magnesium oxide, stearic acid, CUREKIND445, accelerator, pretreated basalt fiber, reinforcing agent, lauric acid glyceryl ester, antioxidant 1010, prepolymer, silane coupling agent A-171, and stannous octoate is 3:90:0.04:15:3:2:3:8:15:4:0.04:2:60:2:0.5;

The reinforcing agent is silicon aluminum carbon black, and the particle size of the silicon aluminum carbon black is 20 μm;

The preparation of the accelerator comprises the following steps:

Selenium dioxide, anhydrous ethanol and diethylamine are mixed, stirred for 15 minutes, stirred in a 5°C water bath for 0.5 hours, carbon disulfide is added, stirring is continued for 2 hours, filtered and dried to obtain the accelerator; the dosage ratio of selenium dioxide, anhydrous ethanol, diethylamine and carbon disulfide is 5g:100mL:10mL:6mL.

Example 2

A method for preparing a high-strength sealing material for a vehicle comprises the following steps:

S1. Place basalt fiber in a sodium hydroxide solution, stir in a water bath at 52°C for 2.5 hours, filter with deionized water, and dry at 80°C for 7 hours to obtain basalt fiber after alkali etching; the ratio of basalt fiber to sodium hydroxide solution is 2.5g:25mL; the concentration of sodium hydroxide solution is 0.5mol/L;

S2. Place the alkaline-etched basalt fiber in a zirconate solution, stir in a water bath at 52° C. for 2.5 h, filter with deionized water, and dry at 60° C. for 7 h to obtain pretreated basalt fiber; the ratio of the alkaline-etched basalt fiber to the zirconate solution is 1.4 g: 25 mL; the mass fraction of zirconate in the zirconate solution is 9%;

S3, put polyoxypropylene glycol ether into a reaction kettle, heat to 110°C, evacuate, dehydrate for 3 hours, cool to room temperature, add 4,4'-diphenylmethane diisocyanate and dibutyltin dilaurate, stir for 1.5 hours, let stand for 0.8 hours, heat to 80°C and react for 2.5 hours to obtain a prepolymer; the mass ratio of the polyoxypropylene glycol ether, 4,4'-diphenylmethane diisocyanate and dibutyltin dilaurate is 105:19:0.14;

S4. Put isocyanatepropyl triethoxysilane, polyoxypropylene glycol ether, dibutyltin dilaurate, zinc oxide, active magnesium oxide, stearic acid, CUREKIND445, accelerator, pretreated basalt fiber, reinforcing agent, lauric acid glyceryl, and antioxidant 1010 into a reaction kettle and mix them. Stir them in a sealed state at 85° C. for 9 hours, cool to room temperature, add the prepolymer, stir them in a sealed state at 45° C. for 3 hours, add silane coupling agent A-171 and stannous octoate, stir them in a vacuum state at room temperature for 1.5 hours, and vacuum fill them into a hose. The high-strength automotive sealing material is obtained; the mass ratio of the isocyanate propyl triethoxysilane, polyoxypropylene glycol ether, dibutyltin dilaurate, zinc oxide, active magnesium oxide, stearic acid, antioxidant, accelerator, pretreated basalt fiber, reinforcing agent, lauric acid glyceryl ester, antioxidant 1010, prepolymer, silane coupling agent A-171, and stannous octoate is 4:95:0.05:18:3.5:3:3.5:9:20:5:0.05:2.5:65:2.5:0.65;

The reinforcing agent is carbon black N330, and the particle size of the carbon black N330 is 25 μm;

The preparation of the accelerator comprises the following steps:

Selenium dioxide, anhydrous ethanol and diethylamine are mixed, stirred for 20 minutes, stirred in a water bath at 7°C for 0.8 hours, carbon disulfide is added, stirring is continued for 2.5 hours, filtered and dried to obtain the accelerator; the dosage ratio of selenium dioxide, anhydrous ethanol, diethylamine and carbon disulfide is 5.5g:100mL:12mL:7mL.

Example 3

A method for preparing a high-strength sealing material for a vehicle comprises the following steps:

S1. Place basalt fiber in a sodium hydroxide solution, stir in a water bath at 55°C for 3h, filter with deionized water, and dry at 80°C for 8h to obtain basalt fiber after alkali etching; the ratio of basalt fiber to sodium hydroxide solution is 3g:30mL; the concentration of sodium hydroxide solution is 0.5mol/L;

S2, taking the basalt fiber after alkali etching and placing it in a zirconate solution, stirring it in a water bath at 55°C for 3h, filtering it with deionized water, and drying it at 60°C for 8h to obtain pretreated basalt fiber; the dosage ratio of the basalt fiber after alkali etching and the zirconate solution is 1.5g:30mL; the mass fraction of zirconate in the zirconate solution is 10%;

S3, put polyoxypropylene glycol ether into a reaction kettle, heat to 110°C, evacuate, dehydrate for 4 hours, cool to room temperature, add 4,4'-diphenylmethane diisocyanate and dibutyltin dilaurate, stir for 2 hours, let stand for 1 hour, heat to 85°C and react for 3 hours to obtain a prepolymer; the mass ratio of the polyoxypropylene glycol ether, 4,4'-diphenylmethane diisocyanate and dibutyltin dilaurate is 110:22:0.18;

S4, take isocyanate propyl triethoxysilane, polyoxypropylene glycol ether, dibutyltin dilaurate, zinc oxide, active magnesium oxide, stearic acid, antioxidant, accelerator, pretreated basalt fiber, reinforcing agent, lauric acid glyceryl ester, antioxidant 1010, put them in a reaction kettle and mix them, seal and stir at 90°C for 10 hours, cool to room temperature, add the prepolymer, seal and stir at 50°C for 4 hours, add silane coupling agent A-171 and stannous octoate, vacuum stir at room temperature for 2 hours, vacuum fill into a hose, and obtain the obtained product. The high-strength sealing material for automobiles; the mass ratio of propyl triethoxysilane, polyoxypropylene glycol ether, dibutyltin dilaurate, zinc oxide, active magnesium oxide, stearic acid, CUREKIND445, accelerator, pretreated basalt fiber, reinforcing agent, lauric acid glyceryl ester, antioxidant 1010, prepolymer, silane coupling agent A-171, and stannous octoate is 5:100:0.06:20:4:4:4:10:25:6:0.06:3:70:3:0.8;

The reinforcing agent is andalusite, and the particle size of the andalusite is 30 μm;

The preparation of the accelerator comprises the following steps:

Selenium dioxide, anhydrous ethanol and diethylamine are mixed, stirred for 25 minutes, stirred in a water bath at 8°C for 1 hour, carbon disulfide is added, stirring is continued for 3 hours, filtered and dried to obtain the accelerator; the dosage ratio of selenium dioxide, anhydrous ethanol, diethylamine and carbon disulfide is 6g:100mL:15mL:8mL.

Comparative Example 1

The difference from Example 2 is that the surface treatment of the basalt fiber in step S1 is as follows:

The basalt fiber was placed in a zirconate solution, stirred in a water bath at 52° C. for 2.5 h, filtered with deionized water, and dried at 60° C. for 7 h to obtain pretreated basalt fiber; the dosage ratio of the basalt fiber to the zirconate solution was 1.4 g: 25 mL; the mass fraction of zirconate in the zirconate solution was 9%.

Comparative Example 2

The difference from Example 2 is that the surface treatment of the basalt fiber in step S1 is as follows:

The basalt fiber was placed in a sodium hydroxide solution, stirred in a water bath at 52° C. for 2.5 h, filtered with deionized water, and dried at 80° C. for 7 h to obtain alkali-etched basalt fiber; the ratio of the basalt fiber to the sodium hydroxide solution was 2.5 g: 25 mL; and the concentration of the sodium hydroxide solution was 0.5 mol/L.

Comparative Example 3

The difference from Example 2 is that no pretreated basalt fiber is added.

Comparative Example 4

The difference from Example 2 is that no zinc oxide is added.

Comparative Example 5

The difference from Example 2 is that no accelerator is added.

Comparative Example 6

The difference from Example 2 is that the particle size of the reinforcing agent is 100 μm.

Comparative Example 7

The difference from Example 2 is that the particle size of the reinforcing agent is 1000 μm.

Comparative Example 8

The difference from Example 2 is that the particle size of the reinforcing agent is 5000 μm.

Comparative Example 9

The difference from Example 2 is that the particle size of the reinforcing agent is 10 μm.

Comparative Example 10

The difference from Example 2 is that the particle size of the reinforcing agent is 0.1 μm.

Performance Testing

Test Example 1

The sealing materials obtained in Examples 1-3 and Comparative Examples 1-10 were subjected to mechanical property tests. Samples were prepared under standard laboratory conditions in accordance with GB/T2941-2006. The samples were placed under standard conditions for 168 hours before testing. The samples were compared with imported similar high-strength modified sealants TerostatMS-935 and polyurethane (PU) adhesive sealants (purchased from Zibo Haitman New Material Technology Co., Ltd.). The test results are shown in Table 1 below.

Table 1

As shown in Table 1, the automotive sealing materials prepared in Examples 1-3 have good tensile strength and elongation at break, and excellent mechanical strength performance;

Comparative Example 1-2 was prepared on the basis of Example 2. Since only a part of the surface treatment was performed on the basalt fiber, the degree of bonding between the basalt fiber and the terminal isocyanate polyurethane prepolymer was poor, and the basalt fiber was easy to fall off during the preparation process, resulting in poor tensile strength and elongation at break of the prepared automotive sealing material;

Comparative Example 3 did not add pretreated basalt fiber, resulting in poor tensile strength and elongation at break of the obtained automotive sealing material

It can be seen from Comparative Examples 4-5 that the co-addition of the accelerator and zinc oxide can improve the tensile strength and elongation at break of the obtained automotive sealing material. This is because the accelerator reacts with zinc oxide during the heating and mixing process to generate active selenium atoms that attach to the surface of the terminal isocyanate polyurethane prepolymer, increasing the cross-linking sites, thereby improving the tensile strength and elongation at break of the obtained automotive sealing material.

It can be seen from Comparative Examples 6-10 that by adjusting the particle size range of the reinforcing agent, it is possible to avoid the situation where the particle size of the reinforcing agent is too large, which results in the inability to fill the internal voids of the terminal isocyanate polyurethane prepolymer molecules, and the particle size of the reinforcing agent is too small, which results in serious agglomeration between particles and the inability to be evenly dispersed in the internal voids of the terminal isocyanate polyurethane prepolymer molecules, thereby improving the tensile strength and elongation at break of the obtained automotive sealing material.

Test Example 2

Heat aging performance test

The sealing materials prepared in Examples 1-3 and Comparative Examples 4-5 were prepared according to the requirements of standard GB/T528-2009 to obtain dumbbell-shaped test pieces. After curing at 90°C for 300 h, 120°C for 3 h and 150°C for 3 h, their mechanical properties were tested. The test results are shown in Table 2 below.

Table 2

It can be seen from Table 2 that, compared with Comparative Examples 4-5, the sealing materials prepared in Examples 1-3 have good heat aging resistance, and still have good tensile strength and elongation at break in a high temperature environment. This is because the accelerator reacts with zinc oxide during the heating and mixing process to generate active selenium atoms that attach to the surface of the terminal isocyanate polyurethane prepolymer, reducing the impact of heat aging on the sealing material and enhancing the heat aging resistance of the sealing material to a certain extent.

The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims (10)

1. The preparation method of the high-strength sealing material for the vehicle is characterized by comprising the following steps of:

S1, placing basalt fibers in a sodium hydroxide solution, stirring for 2-3 hours in a water bath at 50-55 ℃, carrying out suction filtration by using deionized water, and drying for 6-8 hours at 80 ℃ to obtain basalt fibers after alkali corrosion;

s2, placing the basalt fiber subjected to alkali corrosion in a zirconate solution, stirring in a water bath at 50-55 ℃ for 2-3 hours, filtering with deionized water, and drying at 60 ℃ for 6-8 hours to obtain pretreated basalt fiber;

S3, placing polyoxypropylene propylene glycol ether into a reaction kettle, heating to 110 ℃, vacuumizing, dehydrating for 2-4 hours, cooling to room temperature, adding 4,4' -diphenylmethane diisocyanate and dibutyl tin dilaurate, stirring for 1-2 hours, standing for 0.5-1 hour, and heating to 75-85 ℃ for reacting for 2-3 hours to obtain a prepolymer;

S4, taking isocyanatopropyl triethoxysilane, polyoxypropylene propylene glycol ether, dibutyl tin dilaurate, zinc oxide, active magnesium oxide, stearic acid, an anti-aging agent, an accelerator, pretreated basalt fiber, a reinforcing agent, lauric acid glyceride and an antioxidant 1010, placing the materials in a reaction kettle, mixing, sealing and stirring for 8-10 hours at 80-90 ℃, cooling to room temperature, adding the prepolymer, sealing and stirring for 2-4 hours at 40-50 ℃, adding a silane coupling agent A-171 and stannous octoate, vacuum-stirring for 1-2 hours at room temperature, and vacuum-filling the materials into a rubber tube to obtain the high-strength sealing material for the vehicle.

2. The method for preparing a high-strength sealing material for vehicles according to claim 1, wherein in the step S1, the ratio of the basalt fiber to the sodium hydroxide solution is 2-3g:20-30mL.

3. The method for preparing a high-strength sealing material for vehicles according to claim 1, wherein in the step S2, the proportioning ratio of the basalt fiber and the zirconate solution after alkaline etching is 1.2-1.5g:20-30mL.

4. The method for preparing a high-strength sealing material for vehicles according to claim 1, wherein in the step S3, the mass ratio of the polyoxypropylene propylene glycol ether, the 4,4' -diphenylmethane diisocyanate and the dibutyl tin dilaurate is 100-110:16-22:0.11-0.18.

5. The method for producing a high-strength sealing material for vehicles according to claim 1, wherein the antioxidant is CUREKIND 445,445 and the main component is 4,4' -bis (α, α -dimethylbenzyl) diphenylamine.

6. The method for producing a high-strength sealing material for vehicles according to claim 1, wherein the reinforcing agent is any one of silica-alumina carbon black, carbon black N330 and andalusite.

7. The method for preparing the high-strength sealing material for the vehicle according to claim 1, wherein in the step S4, the mass ratio of the isocyanatopropyl triethoxysilane, the polyoxypropylene propylene glycol ether, the dibutyl tin dilaurate, the zinc oxide, the active magnesium oxide, the stearic acid, the anti-aging agent, the accelerator, the pretreated basalt fiber, the reinforcing agent, the glycerol laurate, the antioxidant 1010, the prepolymer, the silane coupling agent A-171 and the stannous octoate is 3-5:90-100:0.04-0.06:15-20:3-4:2-4:3-4:8-10:15-25:4-6:0.04-0.06:2-3:60-70:2-3:0.5-0.8.

8. The method for preparing a high-strength sealing material for vehicles according to claim 1, wherein the preparation of the accelerator comprises the steps of:

Mixing selenium dioxide, absolute ethyl alcohol and diethylamine, stirring for 15-25min, stirring in water bath at 5-8deg.C for 0.5-1h, adding carbon disulfide, stirring for 2-3h, filtering, and drying to obtain the final product.

9. The method for preparing the high-strength sealing material for the vehicle, according to claim 8, wherein the proportioning ratio of selenium dioxide, absolute ethyl alcohol, diethylamine and carbon disulfide is 5-6g:100mL:10-15mL:6-8mL.

10. A high-strength sealing material for vehicles, which is produced by the production method of the high-strength sealing material for vehicles according to any one of claims 1 to 9.