A high-toughness epoxy coating and its preparation method

Abstract

This invention relates to a high-toughness epoxy coating and its preparation method, belonging to the field of epoxy coating technology. The key technical point is that the high-toughness epoxy coating comprises 100 parts of epoxy polymeric elastic resin, 10-20 parts of organic solvent, 1-5 parts of anti-settling agent, and 1-2 parts of soybean lecithin. The method includes: Step S1, weighing each component raw material according to the mass ratio; Step S2, mixing the epoxy polymeric elastic resin and organic solvent and stirring evenly, then adding soybean lecithin, dispersing at 1000-1200 r / min for 20-30 min, and letting it stand for 3-4 hours; then dispersing at 1500-1800 r / min for 20-30 min to form a primary mixture; Step S3, adding the anti-settling agent to the primary mixture and dispersing evenly at 1500-1800 r / min to form the high-toughness epoxy coating. This invention provides a high-toughness epoxy coating with good toughness and weather resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of epoxy coating, in particular to a high-toughness epoxy coating and a preparation method thereof. BACKGROUND

[0002] Epoxy resin is a kind of organic chemical product with wide application and good economic benefit. Epoxy resin coating is a kind of coating with epoxy resin as the main film-forming material. There are many types of epoxy resin coatings, which usually have very good adhesion, chemical stability, corrosion resistance, waterproof performance and insulation performance, and are widely used in the surface of building walls, automobiles and instruments. With the increase of environmental protection pressure and the implementation of volatile organic compound regulations, the proportion of high-solid solvent type coatings is increasing, and users have higher demand for single-pass high-film-thickness coatings. In order to meet these requirements, high-solid low-viscosity epoxy resin has become a new favorite.

[0003] In the epoxy system, in order to meet the requirements of high solid and low viscosity, the main epoxy resin is often selected to be a small molecular weight epoxy resin with low viscosity. However, compared with traditional low solid formulations, small molecular weight epoxy resin has a relatively small molecular weight, and the crosslinked network formed during the curing process is not dense enough, which leads to the fact that the paint film is prone to breakage when subjected to external force, thereby showing brittleness. At the same time, the molecular chain segment of small molecular weight epoxy resin is relatively short, and its mobility will be limited. At low temperature or under external force, the molecular chain segment is difficult to effectively slip and rearrange to absorb energy, and the paint film will also be prone to brittleness. Therefore, the high-solid small-molecular epoxy system is more likely to be damaged due to impact, wear and chiseling during use. In addition, the epoxy group in the epoxy resin is easily broken under the irradiation of ultraviolet light, thereby causing the resin film to powder, and the thermal expansion and contraction of the epoxy resin coating film caused by temperature change leads to cracking of the coating film, high temperature accelerates the chemical reaction in the coating film, making the coating film brittle, thus leading to poor weather resistance of the epoxy coating. SUMMARY

[0004] One of the purposes of the present application is to provide a high-toughness epoxy coating with good toughness and weather resistance.

[0005] The above technical purpose of the present application is achieved by the following technical scheme: a high-toughness epoxy coating, characterized in that it comprises 100 parts of epoxy polymer elastomer, 10-20 parts of organic solvent, 1-5 parts of anti-settling agent and 1-2 parts of soybean phospholipid.

[0006] The epoxy polymer elastomer is prepared by the following method:

[0007] Step 1: Mix the high-polymer elastomer powder with the extracting agent at a mass ratio of 1:3-5, then ultrasonically treat for 10-15 minutes, and then filter and dry the high-polymer elastomer powder in the extracting agent to obtain a soft olefin polymer.

[0008] The extraction agent includes acetone, chloroform, ethylene glycol butyl ether, and the mass ratio of the acetone, chloroform, and ethylene glycol butyl ether is 1:1-2:0.2-0.5;

[0009] Step 2, the epichlorohydrin and trimethylolpropane triglycidyl ether are mixed according to a mass ratio of 1:0.1-0.3 to prepare a treatment liquid, and then the soft olefin polymer is soaked in the treatment liquid for 48-60 hours, and the mass ratio of the soft olefin polymer to the treatment liquid is 1:3-5;

[0010] Then, the bisphenol A is added to the treatment liquid, and the mass ratio of the soft olefin polymer to the bisphenol A is 1:2-4; the temperature is raised to 60-70 degrees, and then the 30%-40% mass concentration potassium hydroxide solution is gradually added, and the mass ratio of the potassium hydroxide solution to the soft olefin polymer is 3-5:1; after the reaction for 4-5 hours, excess distilled water is added to the mixed reactants, and then the upper clear liquid is removed after stirring and standing, and the remaining lower mixture is reserved;

[0011] Step 3, the lower mixture is heated at 70-80 degrees for 4-5 hours to obtain the epoxy polymer elastic resin.

[0012] Through the above technical solution, the extraction agent is used to first swell the high polymer elastic body powder, so that the organic macromolecular network chain in the high polymer elastic body powder is in a chain relaxation state, and the extraction agent can remove small molecule organic matter and impurities in the high polymer elastic body powder that do not participate in the reaction, and reserve space for the next step of interpenetration with the epoxy resin. The filter body after purification treatment is dried to obtain a soft olefin polymer. The soft olefin polymer is soaked in the treatment liquid prepared by premixing the epichlorohydrin and trimethylolpropane triglycidyl ether, so that the volume of the soft olefin polymer is swollen by 4-5 times. Due to the similarity of polarity, the treatment liquid can infiltrate into the interior of the soft olefin polymer while swelling the soft olefin polymer, and the short chain structure of the treatment liquid can be inserted into the network rubber structure of the swollen soft olefin polymer. Continue to add bisphenol A and heat to 60-70 degrees to form bisphenol A di(3-chloro-2-hydroxypropyl) ether interpenetrated with the soft olefin polymer. The 30%-40% mass concentration potassium hydroxide solution is gradually added to generate a bisepoxide interpenetrated with the soft olefin polymer, and the reaction with bisphenol A is continued. After the alkaline removal treatment, the temperature is further increased for reaction to generate an epoxy polymer elastic body. The epoxy polymer elastic body makes the epoxy resin have the flexibility of the high polymer elastic body, which can greatly improve the flexibility of the epoxy resin. The high polymer elastic body powder has better weather resistance and stability than ordinary epoxy resin. Through modification and synthesis, the high polymer elastic body powder is added to the resin base chain, and then the formed paint film has better stability.

[0013] Preferably, the high polymer elastomer powder is sub-micron rubber powder with a particle size ranging from 100 nm to 1 μm.

[0014] Through the above technical solution, the sub-micron rubber powder has fine particles and is easy to disperse, and has a large number of carbon-sulfur bonds and sulfur-sulfur bonds, the bond energy is higher than that of carbon-carbon bonds, the stability is much higher than that of epoxy resin, and the soft olefin polymer has a large amount of reinforcing carbon black, and the carbon black has the function of ultraviolet absorber, can absorb ultraviolet light in the paint film, and has the function of light shielding, which can effectively improve the weather resistance of the paint film as a whole.

[0015] Preferably, the organic solvent includes xylene, n-butanol and acetyl citric acid tributyl ester, and the mass ratio of the xylene, n-butanol and acetyl citric acid tributyl ester is 10-15:5-8:1.

[0016] Through the above technical solution, the addition of acetyl citric acid tributyl ester can slow down the volatilization speed of xylene and n-butanol, and at the same time, the mixed solvent mixed according to the above ratio has similar polarity with the epoxy polymer elastomer, and can better infiltrate the epoxy polymer elastomer.

[0017] Preferably, the anti-settling agent is any one or several of bentonite, fumed silica and polyamide wax.

[0018] Another object of the present application is to provide a high-toughness epoxy coating preparation method for preparing the high-toughness epoxy coating.

[0019] The above technical object of the present application is achieved by the following technical solution:

[0020] A high-toughness epoxy coating preparation method includes the following method steps:

[0021] Step S1, the components are weighed according to the mass ratio;

[0022] Step S2, the epoxy polymer elastomer is mixed with the organic solvent and stirred uniformly, then the soybean phospholipid is added, and dispersed at 1000-1200 r / min for 20-30 min, and then placed for 3-4 hours; then dispersed at 1500-1800 r / min for 20-30 min to form a primary mixture;

[0023] Step S3, the anti-settling agent is added to the primary mixture and dispersed uniformly at 1500-1800 r / min to form the high-toughness epoxy coating. DETAILED DESCRIPTION

[0024] Preparation Example

[0025] Preparation Example 1

[0026] A preparation method of an epoxy polymerized elastic resin comprises:

[0027] Step 1, mixing the sub-micron rubber powder and the extraction agent according to the mass ratio of 1:3, then ultrasonic treatment for 15 minutes, then filtering and drying the sub-micron rubber powder in the extraction agent to obtain the soft olefin polymer;

[0028] The extraction agent comprises acetone, chloroform and ethylene glycol butyl ether, and the mass ratio of the acetone, chloroform and ethylene glycol butyl ether is 1:1:0.2;

[0029] Step 2, compounding the epichlorohydrin and the trimethylolpropane triglycidyl ether according to the mass ratio of 1:0.1 to prepare a treatment liquid, then soaking the soft olefin polymer in the treatment liquid for 48 hours, and the mass ratio of the soft olefin polymer to the treatment liquid is 1:3;

[0030] Then adding the bisphenol A into the treatment liquid, and the mass ratio of the soft olefin polymer to the bisphenol A is 1:2; heating to 60-70 degrees, then gradually adding the 30% mass concentration potassium hydroxide solution, and the mass ratio of the potassium hydroxide solution to the soft olefin polymer is 3:1; after reacting for 4-5 hours, adding excess distilled water into the mixed reactant, then stirring and standing, removing the supernatant, and retaining the remaining bottom mixture;

[0031] Step 3, heating the bottom mixture at 70-80 degrees for 4-5 hours to obtain the epoxy polymerized elastic resin.

[0032] Preparation example 2

[0033] A preparation method of an epoxy polymerized elastic resin comprises:

[0034] Step 1, mixing the sub-micron rubber powder and the extraction agent according to the mass ratio of 1:5, then ultrasonic treatment for 10 minutes, then filtering and drying the sub-micron rubber powder in the extraction agent to obtain the soft olefin polymer;

[0035] The extraction agent comprises acetone, chloroform and ethylene glycol butyl ether, and the mass ratio of the acetone, chloroform and ethylene glycol butyl ether is 1:2:0.5;

[0036] Step 2, compounding the epichlorohydrin and the trimethylolpropane triglycidyl ether according to the mass ratio of 1:0.1 to prepare a treatment liquid, then soaking the soft olefin polymer in the treatment liquid for 48 hours, and the mass ratio of the soft olefin polymer to the treatment liquid is 1:3;

[0037] Then add bisphenol A to the treatment liquid, the mass ratio of soft olefin polymer to bisphenol A is 1:2; heat to 60-70 degrees, then gradually add 30% mass concentration of potassium hydroxide solution, the mass ratio of potassium hydroxide solution to soft olefin polymer is 3:1; after 4-5 hours of reaction, add excess distilled water to the mixed reaction, then stir and stand, remove the supernatant, and retain the remaining lower layer mixture;

[0038] Step 3, heat the lower layer mixture at 70-80℃ for 4-5 hours to obtain the epoxy polymer elastic resin.

[0039] Preparation Example 3

[0040] An epoxy polymer elastic resin preparation comprises:

[0041] Step 1, mix sub-micron rubber powder with extraction agent according to a mass ratio of 1:5, then ultrasonic treatment for 10 minutes, then filter and dry the sub-micron rubber powder in the extraction agent to obtain soft olefin polymer;

[0042] The extraction agent comprises acetone, chloroform, and ethylene glycol butyl ether, and the mass ratio of the acetone, chloroform, and ethylene glycol butyl ether is 1:2:0.5;

[0043] Step 2, compound epoxy chloropropane with trimethylolpropane triglycidyl ether according to a mass ratio of 1:0.3 to make a treatment liquid, then add the soft olefin polymer to the treatment liquid for soaking for 60 hours, and the mass ratio of the soft olefin polymer to the treatment liquid is 1:5;

[0044] Then add bisphenol A to the treatment liquid, the mass ratio of soft olefin polymer to bisphenol A is 1:2; heat to 60-70 degrees, then gradually add 30% mass concentration of potassium hydroxide solution, the mass ratio of potassium hydroxide solution to soft olefin polymer is 3:1; after 4-5 hours of reaction, add excess distilled water to the mixed reaction, then stir and stand, remove the supernatant, and retain the remaining lower layer mixture;

[0045] Step 3, heat the lower layer mixture at 70-80℃ for 4-5 hours to obtain the epoxy polymer elastic resin.

[0046] Preparation Example 4

[0047] An epoxy polymer elastic resin preparation comprises:

[0048] Step 1, mix sub-micron rubber powder with extraction agent according to a mass ratio of 1:3, then ultrasonic treatment for 15 minutes, then filter and dry the sub-micron rubber powder in the extraction agent to obtain soft olefin polymer;

[0049] The extractant includes acetone, chloroform, and ethylene glycol butyl ether, wherein the mass ratio of acetone, chloroform, and ethylene glycol butyl ether is 1:1:0.2.

[0050] Step 2: Epichlorohydrin and trimethylolpropane triglycidyl ether are compounded at a mass ratio of 1:0.1 to prepare a treatment solution. Then, the soft olefin polymer is added to the treatment solution and soaked for 48 hours. The mass ratio of the soft olefin polymer to the treatment solution is 1:3.

[0051] Then, add bisphenol A to the treatment solution, with a mass ratio of soft olefin polymer to bisphenol A of 1:4; heat to 60-70 degrees Celsius, and then gradually add 30% potassium hydroxide solution, with a mass ratio of potassium hydroxide solution to soft olefin polymer of 3:1; after reacting for 4-5 hours, add excess distilled water to the mixed reaction mixture, then stir and let stand, remove the supernatant, and retain the remaining lower mixture;

[0052] Step 3: Heat the lower layer mixture at 70-80°C for 4-5 hours to obtain the epoxy polymer elastic resin.

[0053] Preparation Example 5

[0054] An epoxy polymer elastic resin preparation includes:

[0055] Step 1: Mix submicron rubber powder and extractant at a mass ratio of 1:3, then sonicate for 15 minutes, then filter and dry the submicron rubber powder in the extractant to obtain soft olefin polymer.

[0056] The extractant includes acetone, chloroform, and ethylene glycol butyl ether, wherein the mass ratio of acetone, chloroform, and ethylene glycol butyl ether is 1:1:0.2.

[0057] Step 2: Epichlorohydrin and trimethylolpropane triglycidyl ether are compounded at a mass ratio of 1:0.1 to prepare a treatment solution. Then, the soft olefin polymer is added to the treatment solution and soaked for 48 hours. The mass ratio of the soft olefin polymer to the treatment solution is 1:3.

[0058] Then, add bisphenol A to the treatment solution, with a mass ratio of soft olefin polymer to bisphenol A of 1:4; heat to 60-70 degrees Celsius, and then gradually add 40% potassium hydroxide solution, with a mass ratio of potassium hydroxide solution to soft olefin polymer of 5:1; after reacting for 4-5 hours, add excess distilled water to the mixed reaction mixture, then stir and let stand, remove the supernatant, and retain the remaining lower mixture;

[0059] Step 3: Heat the lower layer mixture at 70-80°C for 4-5 hours to obtain the epoxy polymer elastic resin.

[0060] Example

[0061] Example 1

[0062] A high-toughness epoxy coating comprises 100 parts of epoxy polymer elastic resin (preparation example 1), 10 parts of organic solvent, 1 part of anti-settling agent, and 1 part of soybean lecithin.

[0063] The organic solvents include xylene, n-butanol, and acetylated tributyl citrate, with a mass ratio of xylene, n-butanol, and acetylated tributyl citrate of 10:5:1; the anti-settling agent is bentonite.

[0064] Example 2

[0065] A high-toughness epoxy coating comprises 100 parts of epoxy polymer elastic resin (preparation example 2), 10 parts of organic solvent, 1 part of anti-settling agent, and 1 part of soybean lecithin.

[0066] The organic solvents include xylene, n-butanol, and acetylated tributyl citrate, with a mass ratio of xylene, n-butanol, and acetylated tributyl citrate of 10:5:1; the anti-settling agent is bentonite.

[0067] Example 3

[0068] A high-toughness epoxy coating comprises 100 parts of epoxy polymer elastic resin (preparation example 3), 10 parts of organic solvent, 1 part of anti-settling agent, and 1 part of soybean lecithin.

[0069] The organic solvents include xylene, n-butanol, and acetylated tributyl citrate, with a mass ratio of xylene, n-butanol, and acetylated tributyl citrate of 10:5:1; the anti-settling agent is bentonite.

[0070] Example 4

[0071] A high-toughness epoxy coating comprises 100 parts of epoxy polymer elastic resin (preparation example 3), 10 parts of organic solvent, 1 part of anti-settling agent, and 1 part of soybean lecithin.

[0072] The organic solvents include xylene, n-butanol, and acetylated tributyl citrate, with a mass ratio of xylene, n-butanol, and acetylated tributyl citrate of 10:5:1; the anti-settling agent is bentonite.

[0073] Example 5

[0074] A high-toughness epoxy coating comprises 100 parts of epoxy polymer elastic resin (preparation example 5), 10 parts of organic solvent, 1 part of anti-settling agent, and 1 part of soybean lecithin.

[0075] The organic solvents include xylene, n-butanol, and acetylated tributyl citrate, with a mass ratio of xylene, n-butanol, and acetylated tributyl citrate of 10:5:1; the anti-settling agent is bentonite.

[0076] Example 6

[0077] A high-toughness epoxy coating comprises 100 parts of epoxy polymer elastic resin (preparation example 1), 20 parts of organic solvent, 1 part of anti-settling agent, and 1 part of soybean lecithin.

[0078] The organic solvents include xylene, n-butanol, and acetylated tributyl citrate, with a mass ratio of xylene, n-butanol, and acetylated tributyl citrate of 10:5:1; the anti-settling agent is bentonite.

[0079] Example 7

[0080] A high-toughness epoxy coating comprises 100 parts of epoxy polymer elastic resin (preparation example 1), 10 parts of organic solvent, 5 parts of anti-settling agent, and 1 part of soybean lecithin.

[0081] The organic solvents include xylene, n-butanol, and acetylated tributyl citrate, with a mass ratio of xylene, n-butanol, and acetylated tributyl citrate of 10:5:1; the anti-settling agent is bentonite.

[0082] Example 8

[0083] A high-toughness epoxy coating comprises 100 parts of epoxy polymer elastic resin (preparation example 1), 10 parts of organic solvent, 1 part of anti-settling agent, and 2 parts of soybean lecithin.

[0084] The organic solvents include xylene, n-butanol, and acetylated tributyl citrate, with a mass ratio of xylene, n-butanol, and acetylated tributyl citrate of 10:5:1; the anti-settling agent is bentonite.

[0085] Example 9

[0086] A high-toughness epoxy coating comprises 100 parts of epoxy polymer elastic resin (preparation example 1), 10 parts of organic solvent, 1 part of anti-settling agent, and 1 part of soybean lecithin.

[0087] The organic solvents include xylene, n-butanol, and acetylated tributyl citrate, with a mass ratio of xylene, n-butanol, and acetylated tributyl citrate of 10:8:1; the anti-settling agent is bentonite.

[0088] Example 10

[0089] A high-toughness epoxy coating comprises 100 parts of epoxy polymer elastic resin (preparation example 1), 10 parts of organic solvent, 1 part of anti-settling agent, and 1 part of soybean lecithin.

[0090] The organic solvents include xylene, n-butanol, and acetylated tributyl citrate, with a mass ratio of xylene, n-butanol, and acetylated tributyl citrate of 10:5:1; the anti-settling agent is fumed silica.

[0091] Example 11

[0092] A high-toughness epoxy coating comprises 100 parts of epoxy polymer elastic resin (preparation example 1), 10 parts of organic solvent, 1 part of anti-settling agent, and 1 part of soybean lecithin.

[0093] The organic solvents include xylene, n-butanol, and acetylated tributyl citrate, with a mass ratio of xylene, n-butanol, and acetylated tributyl citrate of 10:5:1; the anti-settling agent is polyamide wax.

[0094] Comparative Example

[0095] A high-toughness epoxy coating comprises 100 parts epoxy resin, 10 parts organic solvent, 1 part anti-settling agent, and 1 part soybean lecithin;

[0096] The organic solvents include xylene, n-butanol, and acetylated tributyl citrate, with a mass ratio of xylene, n-butanol, and acetylated tributyl citrate of 10:5:1; the anti-settling agent is bentonite.

[0097] Experimental methods

[0098] The anti-corrosion coatings prepared in Experimental Examples 1-14 were sprayed onto iron sheets measuring 0.1cm x 0.1cm x 0.1cm. Before spraying, the surface was cleaned with acetone. The coating thickness was 100μm ± 5μm. The coating was cured at 25 ± 2℃. Then, the following performance tests were performed on the samples from Experimental Examples 1-14.

[0099] The adhesion test was conducted in accordance with GB / T5210-2006 "Paints and Varnishes - Pull-off Adhesion Test".

[0100] Salt spray resistance test was conducted in accordance with GB / T1771-2007 "Determination of resistance to neutral salt spray in paints and varnishes";

[0101] Impact strength testing shall be conducted in accordance with GB / T1732-2020 "Test Method for Impact Resistance of Coating Films";

[0102] Artificial aging resistance test shall be conducted in accordance with GB / T9276-1996 "Test Method for Natural Climate Exposure of Coatings";

[0103] The abrasion resistance test was conducted in accordance with GB / T1768-2006 "Determination of abrasion resistance of paints and varnishes - Rotating rubber grinding wheel method".

[0104] The test results are shown in the table below.

[0105] Test item Adhesion force / MPa Salt spray resistance / h Impact strength / kg.cm Artificial weather resistance / h Wear resistance / g Experimental Example 1 18.3 1980 86 1460 0.16 Experimental Example 2 18.2 1960 85 1480 0.18 Experimental Example 3 18.3 1960 85 1460 0.14 Experimental Example 4 18.1 2000 87 1460 0.14 Experimental Example 5 18.3 1940 84 1420 0.13 Experimental Example 6 17.9 1980 85 1480 0.16 Experimental Example 7 18.2 1980 85 1420 0.15 Experimental Example 8 18.2 1940 84 1420 0.15 Experimental Example 9 18.2 1940 86 1460 0.17 Experimental Example 10 17.7 1960 83 1460 0.17 Experimental Example 11 18.1 1960 86 1420 0.15 Comparative Example 16.8 950 54 680 0.35

[0106] Table 1 Experimental performance test results

[0107] As shown in Table 1, this invention significantly improves the impact strength and weather resistance of the film coating by using a modified epoxy polymer elastomer to replace conventional epoxy resin in the formulation. This is because this epoxy polymer elastomer gives epoxy resin the flexibility of rubber, greatly enhancing its flexibility. Furthermore, the soft olefin polymer itself contains a large number of carbon-sulfur bonds and sulfur-sulfur bonds, with bond energies higher than carbon-carbon bonds, resulting in much higher stability than epoxy resin. Simultaneously, the soft olefin polymer contains a large amount of reinforcing carbon black, which is both a black pigment and a UV absorber. In the paint film, it can absorb ultraviolet light, acting as a light shield and improving the overall weather resistance of the paint film.

[0108] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A high-toughness epoxy coating, characterized in that The epoxy polymer elastic resin comprises 100 parts of epoxy polymer elastic resin, 10-20 parts of organic solvent, 1-5 parts of anti-settling agent, and 1-2 parts of soybean phospholipid. The epoxy polymer elastic resin is prepared by the following method: Step 1, the high polymer elastic body powder is mixed with the extraction agent at a mass ratio of 1:3-5, and then ultrasonic treatment is performed for 10-15 minutes, and then the high polymer elastic body powder in the extraction agent is filtered and dried to obtain a soft olefin polymer; The high polymer elastic body powder is submicron rubber powder with a particle size range of 100 nm-1 μm; the submicron rubber powder is fine and easy to disperse, and has a large number of carbon-sulfur bonds and sulfur-sulfur bonds, the bond energy is higher than that of carbon-carbon bonds, the stability is much higher than that of epoxy resin, and the soft olefin polymer has a large amount of reinforcing carbon black, and the carbon black has the function of ultraviolet absorber, can absorb ultraviolet light in the paint film, and has the function of light shielding, which can effectively improve the weather resistance of the paint film as a whole; The extraction agent comprises acetone, chloroform and ethylene glycol butyl ether, and the mass ratio of the acetone, chloroform and ethylene glycol butyl ether is 1:1-2:0.2-0.5; Step 2, the epoxy chloropropane and trimethylolpropane triglycidyl ether are compounded at a mass ratio of 1:0.1-0.3 to prepare a treatment liquid, and then the soft olefin polymer is soaked in the treatment liquid for 48-60 hours, and the mass ratio of the soft olefin polymer to the treatment liquid is 1:3-5; Then, bisphenol A is added to the treatment liquid, and the mass ratio of the soft olefin polymer to the bisphenol A is 1:2-4; the temperature is raised to 60-70 degrees, and then a 30%-40% mass concentration potassium hydroxide solution is gradually added, and the mass ratio of the potassium hydroxide solution to the soft olefin polymer is 3-5:1; after reacting for 4-5 hours, excess distilled water is added to the mixed reaction product, and then stirring and standing are performed, the supernatant is removed, and the remaining lower layer mixture is reserved; Step 3, the lower layer mixture is heated at 70-80℃ for 4-5 hours to obtain the epoxy polymer elastic resin.

2. The high-toughness epoxy coating of claim 1, wherein: The organic solvent comprises xylene, n-butanol and acetyl citric acid tributyl ester, and the mass ratio of the xylene, n-butanol and acetyl citric acid tributyl ester is 10-15:5-8:

1.

3. The high-toughness epoxy coating of claim 1, wherein: The anti-settling agent is any one or several of bentonite, fumed silica and polyamide wax.

4. A method for preparing high-toughness epoxy coating, applied to the preparation of the high-toughness epoxy coating according to any one of claims 1 to 3, characterized in that The method comprises the following steps: Step S1, the raw materials are weighed according to the mass ratio; Step S2, the epoxy polymer elastic resin and the organic solvent are mixed and stirred uniformly, then the soybean phospholipid is added, and the mixture is dispersed at 1000-1200 r / min for 20-30 min and then stands for 3-4 hours; then the mixture is dispersed at 1500-1800 r / min for 20-30 min to form a primary mixture; Step S3, the anti-settling agent is added to the primary mixture and dispersed uniformly at 1500-1800 r / min to form the high-toughness epoxy coating.