An anticorrosive sealing and isolating resin for automobile chassis and a preparation method thereof

Abstract

The application discloses a kind of automobile chassis anticorrosive closed isolation resin and preparation method thereof, belong to anticorrosive resin technical field.The resin includes the following mass parts components: epoxy resin 40-60 parts, acrylic resin 20-30 parts, modified silane coupling agent 3-8 parts, talcum powder 10-20 parts, zinc phosphate 5-15 parts, sodium bentonite 1-3 parts, alumina 3-8 parts, fumed silica 1-3 parts, carbon black 1-3 parts, neopentyl glycol diglycidyl ether 10-20 parts, butyl acetate 50-100 parts.The resin of the application introduces long-chain hydrophobic alkyl and fluorine-containing nitrogen heterocyclic structure by modified silane coupling agent, bridges organic resin and inorganic filler, forms dense coating, has the comprehensive performance such as strong adhesion, excellent salt fog resistance, impact resistance and long-acting anticorrosion, effectively improves the protection durability of automobile chassis.

Description

Technical Field

[0001] This invention belongs to the field of anti-corrosion resin technology, and particularly relates to an anti-corrosion sealing and isolation resin for automobile chassis and its preparation method. Background Technology

[0002] As the component of a vehicle closest to the ground, the chassis is constantly exposed to complex corrosive environments such as rainwater, de-icing agents, and mud, making it highly susceptible to electrochemical corrosion and physical impact damage. This severely impacts the vehicle's structural safety and lifespan. Therefore, effective anti-corrosion sealing treatment of the chassis is a crucial aspect of automobile manufacturing and after-sales maintenance.

[0003] The protection of a vehicle chassis typically involves multiple steps: first, pretreatment such as cleaning, degreasing, and rust removal; then, applying a layer of rust-preventive wax or PVC anti-stone chip coating; some processes also involve applying a protective plate on top of the coating. Rust-preventive wax or PVC coating serves as the primary chemical protective barrier. However, existing protective materials have significant drawbacks: traditional rust-preventive waxes have poor durability, are prone to cracking and peeling, and offer weak resistance to stone impacts; while PVC coatings, although possessing some stone chip resistance, have limited adhesion to the metal chassis and may peel off under long-term thermal cycling or mechanical stress. Furthermore, the physical barrier they form is insufficient to prevent the long-term penetration of corrosive media such as moisture and chloride ions, leading to a decline in anti-corrosion effectiveness over time. In addition, existing coatings often struggle to simultaneously achieve flexibility, heat resistance, and chemical resistance, failing to provide a comprehensive solution for modern automotive chassis that combines long-term corrosion protection, excellent adhesion, impact resistance, and ease of application.

[0004] Therefore, there is an urgent need to develop a new type of anti-corrosion sealing material for automotive chassis. This material can not only firmly adhere to the chassis metal substrate to form a dense and tough sealing layer, but also effectively resist environmental erosion and physical damage for a long time, thereby significantly improving the protection level and durability of the entire vehicle. Summary of the Invention

[0005] To address the above issues and overcome the shortcomings of existing technologies, this invention uses an epoxy resin-acrylic resin composite system as a base. Through the bridging effect of a modified silane coupling agent, it achieves efficient compatibility and chemical bonding between organic resin and inorganic filler. Combined with the thixotropic properties of sodium-based bentonite and the reinforcing effect of talc, the final automotive chassis anti-corrosion sealing and isolation resin has comprehensive properties such as strong adhesion, excellent salt spray resistance, impact resistance, and long-term anti-corrosion.

[0006] To achieve the above objectives, the following technical solution is adopted: On the one hand, the present invention provides an anti-corrosion and sealing resin for automobile chassis, comprising the following components in parts by weight: 40-60 parts epoxy resin, 20-30 parts acrylic resin, 3-8 parts modified silane coupling agent, 10-20 parts talc, 5-15 parts zinc phosphate, 1-3 parts sodium bentonite, 3-8 parts alumina, 1-3 parts fumed silica, 1-3 parts carbon black, 10-20 parts neopentyl glycol diglycidyl ether, and 50-100 parts butyl acetate; The modified silane coupling agent is prepared through the following steps: S1. KH560 and distearylphosphatidic acid were added to a reaction vessel, toluene was added as a solvent, and a catalytic amount of triethylamine was added. Under nitrogen protection, the temperature was raised to 85-90℃ and the reaction was stirred for 5-10 hours. After the reaction was completed, the system was cooled to room temperature, washed twice with 5% sodium bicarbonate solution, and then washed with water until neutral. The organic layer was dried with anhydrous magnesium sulfate and the solvent was removed by vacuum distillation to obtain the intermediate. S2. The intermediate was mixed with 6-trifluoromethylimidazo[1,2-A]pyridine-2-carboxylic acid, dissolved in DMF, and aluminum trichloride was added. The mixture was stirred at 30-50℃ for 10-30 h. After the reaction was completed, the mixture was filtered to obtain the filtrate. The filtrate was diluted with ethyl acetate and washed successively with dilute hydrochloric acid and saturated brine. The organic phase was dried with anhydrous sodium sulfate and concentrated under reduced pressure to obtain the modified silane coupling agent.

[0007] Furthermore, in step S1, the feeding ratio of KH560, distearate phosphatidylcholine, triethylamine and toluene is 200-250g: 500-600g: 1-1.2g: 400-450mL.

[0008] Further, in step S2, the feeding ratio of the intermediate, 6-trifluoromethylimidazo[1,2-A]pyridine-2-carboxylic acid, aluminum trichloride and DMF is: 420-500g: 230-280g: 5-8g: 700-1000mL.

[0009] Furthermore, the epoxy resin is a bisphenol A type epoxy resin with an epoxy equivalent of 180-250 g / eq.

[0010] Furthermore, the acrylic resin is a hydroxyl acrylic resin with a hydroxyl value of 30-60 mgKOH / g and a solid content of 50%-60%.

[0011] Furthermore, the particle size of the talc powder is 1250-2500 mesh.

[0012] Furthermore, the alumina is α-crystalline alumina with an average particle size of 1-5 μm.

[0013] Furthermore, the specific surface area of ​​the fumed silica is 150-200 m² / g. 2 / g.

[0014] On the other hand, the present invention also provides a method for preparing an anti-corrosion and sealing resin for automotive chassis, comprising the following steps: (1) Add epoxy resin, acrylic resin and neopentyl glycol diglycidyl ether to butyl acetate and stir at 500-800 rpm for 20-40 minutes under stirring conditions until the resin is completely dissolved and a uniform resin mixture is formed. (2) Add modified silane coupling agent, talc, zinc phosphate, sodium bentonite, alumina, fumed silica and carbon black to the resin mixture, and then increase the stirring speed to 1000-1500 rpm and disperse at high speed for 30-60 min to ensure that the filler is fully wetted and dispersed. (3) Transfer the dispersed mixture in step (2) to a sand mill or ball mill for grinding until the fineness of the mixture is ≤25μm. Then filter it through a 200-300 mesh sieve to obtain the automotive chassis anti-corrosion sealing and isolation resin.

[0015] The beneficial effects of this invention are: This invention sequentially modifies silane coupling agents in two steps, introducing long-chain hydrophobic alkyl groups and fluorine-containing nitrogen heterocyclic structures into the molecular structure, and then applies them to an epoxy resin-acrylic resin composite system. The long-chain alkyl groups in the modified silane coupling agent can effectively reduce the surface energy of the coating, endowing the resin with excellent hydrophobic and oleophobic properties, and blocking the penetration paths of water vapor and corrosive media. At the same time, the introduction of the fluorine-containing imidazopyridine structure not only forms a dense electronic protective layer through the strong electronegativity of fluorine atoms, significantly improving chemical corrosion resistance, but its rigid heterocyclic structure can also generate intermolecular interactions with epoxy groups and hydroxyl groups in the resin system, enhancing crosslinking density and interfacial adhesion. Zinc phosphate, alumina, fumed silica and other fillers form a synergistic anti-corrosion and reinforcing network in the resin, further improving the physical shielding effect and impact resistance of the coating.

[0016] This invention uses an epoxy resin-acrylic resin composite system as a base. Through the bridging effect of a modified silane coupling agent, it achieves efficient compatibility and chemical bonding between organic resin and inorganic filler. Combined with the thixotropic properties of sodium-based bentonite and the reinforcing effect of talc, the final automotive chassis anti-corrosion sealing and isolation resin has comprehensive properties such as strong adhesion, excellent salt spray resistance, impact resistance, and long-term anti-corrosion. Attached Figure Description

[0017] Figure 1 The graph shows the adhesion test results of the resins prepared in various embodiments and comparative examples of the present invention; Figure 2The graph shows the salt spray resistance test results of the resins prepared in various embodiments and comparative examples of the present invention. Figure 3 The graph shows the impact resistance test results of the resins prepared in various embodiments and comparative examples of the present invention. Figure 4 The graph shows the chemical resistance test results of the resins prepared in various embodiments and comparative examples of the present invention.

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those familiar to those skilled in the art. Furthermore, any methods and materials similar to or equivalent to those described herein may be applied to this invention. The preferred embodiments and materials described herein are for illustrative purposes only and do not limit the scope of this application.

[0021] Unless otherwise specified, the experimental methods used in the following examples are conventional methods, and the experimental materials used in the following examples are all purchased from commercial channels.

[0022] Example 1

[0023] A corrosion-resistant and sealing resin for automotive chassis comprises the following components in parts by weight: 40 parts epoxy resin, 20 parts acrylic resin, 3 parts modified silane coupling agent, 10 parts talc, 5 parts zinc phosphate, 1 part sodium bentonite, 3 parts alumina, 1 part fumed silica, 1 part carbon black, 10 parts neopentyl glycol diglycidyl ether, and 50 parts butyl acetate. The modified silane coupling agent is prepared through the following steps: S1. KH560 and distearylphosphatidic acid were added to a reaction vessel, toluene was added as a solvent, and a catalytic amount of triethylamine was added. Under nitrogen protection, the temperature was raised to 85°C and the reaction was stirred for 5 hours. After the reaction was completed, the system was cooled to room temperature, washed twice with 5% sodium bicarbonate solution, and then washed with water until neutral. The organic layer was dried with anhydrous magnesium sulfate and the solvent was removed by vacuum distillation to obtain the intermediate. S2. The intermediate was mixed with 6-trifluoromethylimidazo[1,2-A]pyridine-2-carboxylic acid, dissolved in DMF, and aluminum trichloride was added. The mixture was stirred at 30°C for 10 h. After the reaction was completed, the mixture was filtered to obtain the filtrate. The filtrate was diluted with ethyl acetate and washed successively with dilute hydrochloric acid and saturated brine. The organic phase was dried with anhydrous sodium sulfate and concentrated under reduced pressure to obtain the modified silane coupling agent.

[0024] In step S1, the feeding ratio of KH560, distearate phosphatidylcholine, triethylamine and toluene is 200g:500g:1g:400mL.

[0025] In step S2, the feeding ratio of the intermediate, 6-trifluoromethylimidazo[1,2-A]pyridine-2-carboxylic acid, aluminum trichloride and DMF is 420g: 230g: 5g: 700mL.

[0026] The epoxy resin is a bisphenol A type epoxy resin with an epoxy equivalent of 180 g / eq; the acrylic resin is a hydroxyl acrylic resin with a hydroxyl value of 30 mg KOH / g and a solid content of 50%; the talc powder has a particle size of 1250 mesh; the alumina is α-crystalline alumina with an average particle size of 1 μm; and the fumed silica has a specific surface area of ​​150 m². 2 / g.

[0027] A method for preparing an anti-corrosion and sealing resin for automotive chassis includes the following steps: (1) Add epoxy resin, acrylic resin and neopentyl glycol diglycidyl ether to butyl acetate and stir at 500 rpm for 20 min under stirring conditions until the resin is completely dissolved and a uniform resin mixture is formed. (2) Add modified silane coupling agent, talc, zinc phosphate, sodium bentonite, alumina, fumed silica and carbon black to the resin mixture, and then increase the stirring speed to 1000 rpm and disperse at high speed for 30 min to ensure that the filler is fully wetted and dispersed. (3) Transfer the dispersed mixture in step (2) to a sand mill or ball mill for grinding until the fineness of the mixture is ≤25μm, and then filter it through a 200-mesh sieve to obtain the automotive chassis anti-corrosion sealing and isolation resin.

[0028] Example 2

[0029] A corrosion-resistant and sealing resin for automotive chassis comprises the following components in parts by weight: 60 parts epoxy resin, 30 parts acrylic resin, 8 parts modified silane coupling agent, 20 parts talc, 15 parts zinc phosphate, 3 parts sodium bentonite, 8 parts alumina, 3 parts fumed silica, 3 parts carbon black, 20 parts neopentyl glycol diglycidyl ether, and 100 parts butyl acetate. The modified silane coupling agent is prepared through the following steps: S1. KH560 and distearylphosphatidic acid were added to a reaction vessel, toluene was added as a solvent, and a catalytic amount of triethylamine was added. Under nitrogen protection, the temperature was raised to 90°C and the reaction was stirred for 10 h. After the reaction was completed, the system was cooled to room temperature, washed twice with 5% sodium bicarbonate solution, and then washed with water until neutral. The organic layer was dried with anhydrous magnesium sulfate and the solvent was removed by vacuum distillation to obtain the intermediate. S2. The intermediate was mixed with 6-trifluoromethylimidazo[1,2-A]pyridine-2-carboxylic acid, dissolved in DMF, and aluminum trichloride was added. The mixture was stirred at 50°C for 30 h. After the reaction was completed, the mixture was filtered to obtain the filtrate. The filtrate was diluted with ethyl acetate and washed successively with dilute hydrochloric acid and saturated brine. The organic phase was dried with anhydrous sodium sulfate and concentrated under reduced pressure to obtain the modified silane coupling agent.

[0030] In step S1, the feeding ratio of KH560, distearate, triethylamine and toluene is 250g:600g:1.2g:450mL.

[0031] In step S2, the feeding ratio of the intermediate, 6-trifluoromethylimidazo[1,2-A]pyridine-2-carboxylic acid, aluminum trichloride and DMF is 500g: 280g: 8g: 1000mL.

[0032] The epoxy resin is a bisphenol A type epoxy resin with an epoxy equivalent of 250 g / eq; the acrylic resin is a hydroxyl acrylic resin with a hydroxyl value of 60 mg KOH / g and a solid content of 60%; the talc powder has a particle size of 2500 mesh; the alumina is α-crystalline alumina with an average particle size of 5 μm; and the fumed silica has a specific surface area of ​​200 m². 2 / g.

[0033] A method for preparing an anti-corrosion and sealing resin for automotive chassis includes the following steps: (1) Add epoxy resin, acrylic resin and neopentyl glycol diglycidyl ether to butyl acetate and stir at 800 rpm for 40 min under stirring conditions until the resin is completely dissolved and a uniform resin mixture is formed. (2) Add modified silane coupling agent, talc, zinc phosphate, sodium bentonite, alumina, fumed silica and carbon black to the resin mixture, and then increase the stirring speed to 1500 rpm and disperse at high speed for 60 min to ensure that the filler is fully wetted and dispersed. (3) Transfer the dispersed mixture in step (2) to a sand mill or ball mill for grinding until the fineness of the mixture is ≤25μm, and then filter it through a 300-mesh sieve to obtain the automotive chassis anti-corrosion sealing and isolation resin.

[0034] Example 3

[0035] A corrosion-resistant and sealing resin for automotive chassis comprises the following components in parts by weight: 50 parts epoxy resin, 25 parts acrylic resin, 5 parts modified silane coupling agent, 15 parts talc, 10 parts zinc phosphate, 2 parts sodium bentonite, 5 parts alumina, 2 parts fumed silica, 2 parts carbon black, 15 parts neopentyl glycol diglycidyl ether, and 75 parts butyl acetate. The modified silane coupling agent is prepared through the following steps: S1. KH560 and distearylphosphatidic acid were added to a reaction vessel, toluene was added as a solvent, and a catalytic amount of triethylamine was added. Under nitrogen protection, the temperature was raised to 88°C and the reaction was stirred for 7 hours. After the reaction was completed, the system was cooled to room temperature, washed twice with 5% sodium bicarbonate solution, and then washed with water until neutral. The organic layer was dried with anhydrous magnesium sulfate and the solvent was removed by vacuum distillation to obtain the intermediate. S2. The intermediate was mixed with 6-trifluoromethylimidazo[1,2-A]pyridine-2-carboxylic acid, dissolved in DMF, and aluminum trichloride was added. The mixture was stirred at 40°C for 20 h. After the reaction was completed, the mixture was filtered to obtain the filtrate. The filtrate was diluted with ethyl acetate and washed successively with dilute hydrochloric acid and saturated brine. The organic phase was dried with anhydrous sodium sulfate and concentrated under reduced pressure to obtain the modified silane coupling agent.

[0036] In step S1, the feeding ratio of KH560, distearate phosphatidic acid, triethylamine, and toluene is 225g:550g:1.1g:425mL; in step S2, the feeding ratio of the intermediate, 6-trifluoromethylimidazo[1,2-A]pyridine-2-carboxylic acid, aluminum trichloride, and DMF is 460g:255g:6.5g:850mL; the epoxy resin is bisphenol A type epoxy resin with an epoxy equivalent of 215g / eq; the acrylic resin is hydroxyl acrylic resin with a hydroxyl value of 45mgKOH / g and a solid content of 55%; the talc powder has a particle size of 1800 mesh; the alumina is α-crystalline alumina with an average particle size of 3μm; and the fumed silica has a specific surface area of ​​180m². 2 / g.

[0037] A method for preparing an anti-corrosion and sealing resin for automotive chassis includes the following steps: (1) Add epoxy resin, acrylic resin and neopentyl glycol diglycidyl ether to butyl acetate and stir at 600 rpm for 30 min under stirring conditions until the resin is completely dissolved and a uniform resin mixture is formed. (2) Add modified silane coupling agent, talc, zinc phosphate, sodium bentonite, alumina, fumed silica and carbon black to the resin mixture, and then increase the stirring speed to 1200 rpm and disperse at high speed for 45 min to ensure that the filler is fully wetted and dispersed. (3) Transfer the dispersed mixture in step (2) to a sand mill or ball mill for grinding until the fineness of the mixture is ≤25μm, and then filter it through a 250-mesh sieve to obtain the automotive chassis anti-corrosion sealing and isolation resin.

[0038] Comparative Example 1: Except for the absence of modified silane coupling agent, the components and preparation method in this comparative example are exactly the same as in Example 3.

[0039] Comparative Example 2: In this comparative example, an equal amount of KH560 was used to replace the modified silane coupling agent prepared in this invention, and the remaining components and preparation methods were exactly the same as in Example 1.

[0040] Results Analysis The performance differences between the embodiments of the present invention and the comparative examples are evaluated through the following standardized tests.

[0041] Test Example 1: Adhesion Test According to GB / T 5210 standard, the adhesion of the coating is tested by the pull-off method using an adhesion tester. The specific steps are as follows: The resin to be tested is evenly coated on a clean and dry tinplate. After curing, the test piece is bonded to the coating surface with an adhesive. After complete curing, the test piece is pulled off vertically at a constant rate using an adhesion tester. The maximum tensile force when the coating is pulled off is recorded, and the adhesion strength is calculated.

[0042] Test results are as follows Figure 1 As shown, Figure 1 All embodiments of the present invention exhibited excellent adhesion, with Example 3 showing the highest adhesion strength. This was due to the modified silane coupling agent forming a strong chemical bond between the resin matrix and the metal substrate, enhancing interfacial bonding. Comparative Example 1, lacking the modified silane coupling agent, had the worst adhesion, while Comparative Example 2, using unmodified KH560, showed improved adhesion but still fell short of the examples.

[0043] Test Example 2: Salt Spray Resistance Test According to GB / T 10125 standard, a neutral salt spray test is conducted using a salt spray test chamber. The specific steps are as follows: Place the coated sample with intersecting lines to the substrate in a salt spray chamber at a constant temperature of 35±2℃, continuously spray with 5% sodium chloride solution, and remove the sample after 720 hours of testing. Observe the blistering and corrosion spread width (scratch extension, mm) of the coating on both sides of the scratch, as well as the corrosion status of the unscratched areas of the sample.

[0044] Test results are as follows Figure 2 As shown, Figure 2 All embodiments of the present invention exhibit excellent corrosion resistance, with Example 3 showing the smallest scratch propagation width, indicating its superior corrosion resistance. The fluorinated groups introduced by the modified silane coupling agent synergistically construct a highly efficient anti-permeability barrier with the flake fillers (such as talc and alumina), blocking water vapor and corrosive media. In contrast, Comparative Examples 1 and 2 show significantly poorer salt spray resistance.

[0045] Test Example 3: Impact Resistance Test According to GB / T 1732 standard, impact resistance testing is conducted using a paint film impactor. The specific steps are as follows: Place the coated test panel on the impactor base and allow a 1kg hammer to fall freely from different heights, impacting the coating on the test panel surface. Observe whether the coating cracks or peels off. The impact resistance of the coating is determined by changing the height.

[0046] Test results are as follows Figure 3 As shown, Figure 3 The embodiments of the present invention demonstrate excellent impact resistance, which is attributed to the enhanced interfacial bonding force provided by the modified silane coupling agent and the good flexibility of the resin system. Comparative Examples 1 and 2, however, exhibit weaker impact resistance.

[0047] Test Example 4: Chemical Resistance Test According to GB / T 11547 standard, the resistance to liquid chemicals was tested in a constant temperature immersion bath. The specific steps are as follows: the coated test piece was partially immersed in a 5% sulfuric acid solution and a 5% sodium chloride solution at a temperature of 25°C for 72 hours, and then removed and its mass change was measured.

[0048] Test results are as follows Figure 4 As shown, Figure 4 It can be seen that the mass change rate of each embodiment is low in 5% sulfuric acid and 5% sodium chloride solutions, indicating that their chemical stability is better. The fluorinated imidazopyridine structure in the modified silane coupling agent forms a dense electron protective layer through the strong electronegativity of fluorine atoms, which improves the chemical corrosion resistance. The chemical resistance of comparative examples 1 and 2 is poor.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0050] The present invention and its embodiments have been described above. This description is not restrictive, and the embodiments shown are only one of the embodiments of the present invention. The actual application is not limited to this. In conclusion, if those skilled in the art are inspired by this description and design similar methods and embodiments without departing from the spirit of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A corrosion-resistant and sealing resin for automotive chassis, characterized in that: The product comprises the following components in parts by weight: 40-60 parts epoxy resin, 20-30 parts acrylic resin, 3-8 parts modified silane coupling agent, 10-20 parts talc, 5-15 parts zinc phosphate, 1-3 parts sodium bentonite, 3-8 parts alumina, 1-3 parts fumed silica, 1-3 parts carbon black, 10-20 parts neopentyl glycol diglycidyl ether, and 50-100 parts butyl acetate. The modified silane coupling agent is prepared through the following steps: S1. KH560 and distearylphosphatidic acid were added to a reaction vessel, toluene was added as a solvent, and a catalytic amount of triethylamine was added. Under nitrogen protection, the temperature was raised to 85-90℃ and the reaction was stirred for 5-10 hours. After the reaction was completed, the system was cooled to room temperature, washed twice with 5% sodium bicarbonate solution, and then washed with water until neutral. The organic layer was dried with anhydrous magnesium sulfate and the solvent was removed by vacuum distillation to obtain the intermediate. S2. The intermediate was mixed with 6-trifluoromethylimidazo[1,2-A]pyridine-2-carboxylic acid, dissolved in DMF, and aluminum trichloride was added. The mixture was stirred at 30-50℃ for 10-30 h. After the reaction was completed, the mixture was filtered to obtain the filtrate. The filtrate was diluted with ethyl acetate and washed successively with dilute hydrochloric acid and saturated brine. The organic phase was dried with anhydrous sodium sulfate and concentrated under reduced pressure to obtain the modified silane coupling agent.

2. The automotive chassis anti-corrosion sealing and isolation resin according to claim 1, characterized in that: In step S1, the feeding ratio of KH560, distearate phosphatidylcholine, triethylamine and toluene is 200-250g: 500-600g: 1-1.2g: 400-450mL.

3. The automotive chassis anti-corrosion sealing and isolation resin according to claim 2, characterized in that: In step S2, the feeding ratio of the intermediate, 6-trifluoromethylimidazo[1,2-A]pyridine-2-carboxylic acid, aluminum trichloride and DMF is 420-500g: 230-280g: 5-8g: 700-1000mL.

4. The automotive chassis anti-corrosion sealing and isolation resin according to claim 3, characterized in that: The epoxy resin is a bisphenol A type epoxy resin with an epoxy equivalent of 180-250 g / eq.

5. The automotive chassis anti-corrosion sealing and isolation resin according to claim 4, characterized in that: The acrylic resin is a hydroxyl acrylic resin with a hydroxyl value of 30-60 mgKOH / g and a solid content of 50%-60%.

6. The automotive chassis anti-corrosion sealing and isolation resin according to claim 5, characterized in that: The talc powder has a particle size of 1250-2500 mesh.

7. The automotive chassis anti-corrosion sealing and isolation resin according to claim 6, characterized in that: The alumina is α-crystalline alumina with an average particle size of 1-5 μm.

8. The automotive chassis anti-corrosion sealing and isolation resin according to claim 7, characterized in that: The specific surface area of ​​the fumed silica is 150-200 m². 2 / g.

9. A method for preparing an automotive chassis anti-corrosion sealing and isolating resin according to any one of claims 1-8, characterized in that: Includes the following steps: (1) Add epoxy resin, acrylic resin and neopentyl glycol diglycidyl ether to butyl acetate and stir at 500-800 rpm for 20-40 minutes under stirring conditions until the resin is completely dissolved and a uniform resin mixture is formed. (2) Add modified silane coupling agent, talc, zinc phosphate, sodium bentonite, alumina, fumed silica and carbon black to the resin mixture, and then increase the stirring speed to 1000-1500 rpm and disperse at high speed for 30-60 min to ensure that the filler is fully wetted and dispersed. (3) Transfer the dispersed mixture in step (2) to a sand mill or ball mill for grinding until the fineness of the mixture is ≤25μm. Then filter it through a 200-300 mesh sieve to obtain the automotive chassis anti-corrosion sealing and isolation resin.

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