High-toughness epoxy coating and preparation method thereof

Abstract

The invention relates to a high-toughness epoxy coating and a preparation method thereof, and belongs to the technical field of epoxy coatings, and the key point of the technical scheme is that the high-toughness epoxy coating comprises 100 parts of epoxy polymerized elastic resin, 10-20 parts of an organic solvent, 1-5 parts of an anti-settling agent and 1-2 parts of soybean lecithin; the method comprises the following steps: S1, weighing the raw materials according to the mass ratio; s2, mixing the epoxy polymerized elastic resin with an organic solvent, uniformly stirring, then adding soybean lecithin, dispersing for 20-30 minutes under the condition of 1000-1200 r / min, and standing for 3-4 hours; then dispersing for 20 to 30 minutes under the condition of 1500 to 1800r / min, so as to form a primary mixed material; and S3, adding an anti-settling agent into the primary mixed material, and uniformly dispersing under the condition of 1500-1800r / min to form the high-toughness epoxy coating, the high-toughness epoxy coating provided by the invention has good toughness and weather resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of epoxy coatings, and particularly relates to a high-toughness epoxy coating and a preparation method thereof. Background Art

[0002] Epoxy resins are a type of organic chemical product with very wide applications and relatively good economic benefits. Epoxy resin coatings are coatings with epoxy resins as the main film-forming substances, with a large variety, and usually have excellent properties such as very good adhesion, chemical stability, anti-corrosion, waterproof performance, and insulation. Therefore, they are widely used on the surfaces of building walls, automobiles, instruments, etc. With the increasing environmental protection pressure and the implementation of volatile organic compound regulations, the proportion of high-solids solvent-based coatings shows an increasing trend, and at the same time, users have higher requirements for single-pass high-film-thickness coatings. To meet these requirements, high-solid low-viscosity epoxy resins have become the new favorites.

[0003] In the epoxy system, in order to meet the requirements of high-solid low-viscosity, the main epoxy resin often selects small-molecular-weight epoxy resins with lower viscosities. However, compared with traditional low-solid formulations, due to the smaller molecular weights of small-molecular-weight epoxy resins, the crosslinked network formed during the curing process is not dense enough, resulting in the paint film being prone to fracture when subjected to external forces, thus showing brittleness. At the same time, the molecular chain segments of small-molecular-weight epoxy resins are relatively short, and their mobility is restricted. At low temperatures or when subjected to external forces, the molecular chain segments are difficult to effectively slip and rearrange to absorb energy, and the paint film is also prone to becoming brittle. Therefore, when using high-solid small-molecule epoxy systems, they are more likely to be damaged due to impact, abrasion, and chiseling. In addition, the epoxy groups in epoxy resins are extremely prone to breakage under ultraviolet irradiation, resulting in resin film powdering. Moreover, temperature changes cause thermal expansion and contraction of epoxy resin coatings, leading to coating cracking. High temperatures accelerate the chemical reactions in the coatings, making the coatings brittle. Therefore, epoxy coatings have poor weather resistance. Summary of the Invention

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

[0005] The above technical purpose of the present invention is achieved through the following technical solutions: A high-toughness epoxy coating, characterized by comprising 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;

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

[0007] Step 1, mix the high-polymer elastic body powder and the extractant in a mass ratio of 1:3 - 5, then perform ultrasonic treatment for 10 - 15 minutes, and then filter and dry the high-polymer elastic body powder in the extractant to obtain a soft olefin polymer;

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

[0009] Step 2: Epichlorohydrin and trimethylolpropane triglycidyl ether are compounded according to a mass ratio of 1:0.1-0.3 to prepare a treatment solution. Then, the soft olefin polymer is added to the treatment solution and soaked for 48-60 hours. The mass ratio of the soft olefin polymer to the treatment solution is 1:3-5;

[0010] Then, bisphenol A is added to the treatment solution. The mass ratio of the soft olefin polymer to bisphenol A is 1:2-4; the temperature is raised to 60-70 °C, and then a potassium hydroxide solution with a mass concentration of 30%-40% is gradually added. The mass ratio of the potassium hydroxide solution to the soft olefin polymer is 3-5:1; after reacting for 4-5 hours, an excessive amount of distilled water is added to the mixed reactants, and then it is stirred and left to stand. The upper clear liquid is removed, and the remaining lower-layer mixture is retained;

[0011] Step 3: The lower-layer mixture is heated at 70-80 °C for 4-5 hours to obtain the epoxy polymer elastic resin.

[0012] Through the above technical solution, by using the extractant, the high-polymer elastic body powder is first swollen, so that the organic macromolecular network chains in the high-polymer elastic body powder are in a chain-relaxed state, enabling the extractant to remove unreacted small-molecule organic substances and impurities in the high-polymer elastic body powder, and reserving space for the next interpenetration with epoxy resin. The purified filter body is dried to obtain a soft olefin polymer. The soft olefin polymer is soaked in the treatment solution prepared by premixing epichlorohydrin and trimethylolpropane triglycidyl ether, causing the volume of the soft olefin polymer to swell by 4-5 times. Due to similar polarities, while swelling the soft olefin polymer, the treatment solution can infiltrate into the interior of the soft olefin polymer, and the short-chain structure of the treatment solution can interpenetrate into the network rubber structure of the swollen soft olefin polymer. Bisphenol A is continuously added and heated to 60-70 °C to form bisphenol A bis(3-chloro-2-hydroxypropyl) ether that interpenetrates with the soft olefin polymer. A potassium hydroxide solution with a mass concentration of 30%-40% is gradually added to generate a bicyclic epoxide that interpenetrates with the soft olefin polymer, continues to react with bisphenol A, and after further dealkalization treatment and heating, an epoxy polymer elastomer is generated. This epoxy polymer elastomer endows epoxy resin with the flexibility of the high-polymer elastic body, which can greatly improve the flexibility of epoxy resin; and the high-polymer elastic body powder has better weather resistance and stability compared with ordinary epoxy resin. Through modification and synthesis, it is added to the resin-based chain, thereby making the formed paint film have better stability.

[0013] Preferably, the high polymeric elastomer powder is submicron rubber powder with a particle size range of 100 nm - 1 μm.

[0014] Through the above technical solution, the submicron rubber powder particles are small and easy to disperse, and it itself has a large number of carbon-sulfur bonds and sulfur-sulfur bonds. The bond energy is higher than that of carbon-carbon bonds, and its own stability is much higher than that of epoxy resin. At the same time, there is a large amount of carbon black with a reinforcing effect in the soft olefin polymer, and the carbon black has the function of an ultraviolet absorber and can absorb ultraviolet light in the paint film to play a light shielding role, which can effectively improve the overall weather resistance of the paint film.

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

[0016] Through the above technical solution, adding tributyl acetylcitrate can slow down the volatilization rate of xylene and n-butanol. At the same time, the mixed solvent mixed in this proportion has a similar polarity to 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, polyamide wax.

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

[0019] The above technical object of the present invention is achieved through the following technical solutions:

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

[0021] Step S1, weighing each component raw material according to the mass ratio;

[0022] Step S2, mixing the epoxy polymer elastomer with the organic solvent and stirring evenly, then adding soy lecithin, and dispersing for 20 - 30 min at 1000 - 1200 r / min, and standing for 3 - 4 hours; then dispersing for 20 - 30 min at 1500 - 1800 r / min to form a primary mixture;

[0023] 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. Specific Embodiments

[0024] Preparation Examples

[0025] Preparation Example 1

[0026] Preparation of an epoxy polymer elastic resin, comprising:

[0027] Step 1: Mix submicron rubber powder and an extractant in a mass ratio of 1:3, then perform ultrasonic treatment for 15 minutes, and then filter and dry the submicron rubber powder in the extractant to obtain a soft olefin polymer;

[0028] The extractant includes acetone, chloroform, and ethylene glycol monobutyl ether, and the mass ratio of acetone, chloroform, and ethylene glycol monobutyl ether is 1:1:0.2;

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

[0030] Then add bisphenol A to the treatment solution, and the mass ratio of the soft olefin polymer to bisphenol A is 1:2; heat to 60 - 70 °C, and then gradually add a 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, add excessive distilled water to the mixed reactants, then stir and let stand, remove the upper clear liquid, and retain the remaining lower mixture;

[0031] Step 3: Heat the lower mixture at 70 - 80 °C for 4 - 5 hours to obtain the epoxy polymer elastic resin.

[0032] Preparation Example 2

[0033] Preparation of an epoxy polymer elastic resin, comprising:

[0034] Step 1: Mix submicron rubber powder and an extractant in a mass ratio of 1:5, then perform ultrasonic treatment for 10 minutes, and then filter and dry the submicron rubber powder in the extractant to obtain a soft olefin polymer;

[0035] The extractant includes acetone, chloroform, and ethylene glycol monobutyl ether, and the mass ratio of acetone, chloroform, and ethylene glycol monobutyl ether is 1:2:0.5;

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

[0037] Then, bisphenol A was added to the treatment liquid, and the mass ratio of the soft olefin polymer to bisphenol A was 1:2; the temperature was raised to 60-70 °C, and then a 30% potassium hydroxide solution by mass concentration was gradually added. The mass ratio of the potassium hydroxide solution to the soft olefin polymer was 3:1; after reacting for 4-5 hours, an excessive amount of distilled water was added to the mixed reactants, and then after stirring and standing, the upper clear liquid was removed, and the remaining lower-layer mixture was retained;

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

[0039] Preparation Example 3

[0040] The preparation of an epoxy polymer elastic resin includes:

[0041] Step 1, mixing the submicron rubber powder with the extractant in a mass ratio of 1:5, then performing ultrasonic treatment for 10 minutes, and then filtering and drying the submicron rubber powder in the extractant to obtain a soft olefin polymer;

[0042] The extractant includes acetone, chloroform, and ethylene glycol monobutyl ether, and the mass ratio of acetone, chloroform, and ethylene glycol monobutyl ether is 1:2:0.5;

[0043] Step 2, compounding epichlorohydrin and trimethylolpropane triglycidyl ether in a mass ratio of 1:0.3 to make a treatment liquid, and then adding the soft olefin polymer to the treatment liquid and soaking for 60 hours. The mass ratio of the soft olefin polymer to the treatment liquid is 1:5;

[0044] Then, bisphenol A was added to the treatment liquid, and the mass ratio of the soft olefin polymer to bisphenol A was 1:2; the temperature was raised to 60-70 °C, and then a 30% potassium hydroxide solution by mass concentration was gradually added. The mass ratio of the potassium hydroxide solution to the soft olefin polymer was 3:1; after reacting for 4-5 hours, an excessive amount of distilled water was added to the mixed reactants, and then after stirring and standing, the upper clear liquid was removed, and the remaining lower-layer mixture was retained;

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

[0046] Preparation Example 4

[0047] The preparation of an epoxy polymer elastic resin includes:

[0048] Step 1, mixing the submicron rubber powder with the extractant in a mass ratio of 1:3, then performing ultrasonic treatment for 15 minutes, and then filtering and drying the submicron rubber powder in the extractant to obtain a soft olefin polymer;

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

[0050] Step 2: Mix epichlorohydrin and trimethylolpropane triglycidyl ether in a mass ratio of 1:0.1 to prepare a treatment liquid, then add the soft olefin polymer to the treatment liquid and soak for 48 hours. The mass ratio of the soft olefin polymer to the treatment liquid is 1:3;

[0051] Then add bisphenol A to the treatment liquid. The mass ratio of the soft olefin polymer to bisphenol A is 1:4; heat to 60 - 70 °C, and then gradually add a potassium hydroxide solution with a mass concentration of 30%. The mass ratio of the potassium hydroxide solution to the soft olefin polymer is 3:1; after reacting for 4 - 5 hours, add excessive distilled water to the mixed reactants, then stir and let stand, remove the upper clear liquid, and retain the remaining lower-layer mixture;

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

[0053] Preparation Example 5

[0054] A preparation method of an epoxy polymer elastic resin includes:

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

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

[0057] Step 2: Mix epichlorohydrin and trimethylolpropane triglycidyl ether in a mass ratio of 1:0.1 to prepare a treatment liquid, then add the soft olefin polymer to the treatment liquid and soak for 48 hours. The mass ratio of the soft olefin polymer to the treatment liquid is 1:3;

[0058] Then add bisphenol A to the treatment liquid. The mass ratio of the soft olefin polymer to bisphenol A is 1:4; heat to 60 - 70 °C, and then gradually add a potassium hydroxide solution with a mass concentration of 40%. The mass ratio of the potassium hydroxide solution to the soft olefin polymer is 5:1; after reacting for 4 - 5 hours, add excessive distilled water to the mixed reactants, then stir and let stand, remove the upper clear liquid, and retain the remaining lower-layer mixture;

[0059] Step 3: Heat the lower-layer mixture in an environment of 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, comprising 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 phospholipid;

[0063] The organic solvent includes xylene, n-butanol, and tributyl acetylcitrate, and the mass ratio of xylene, n-butanol, and tributyl acetylcitrate is 10:5:1; the anti-settling agent is bentonite.

[0064] Example 2

[0065] A high-toughness epoxy coating, comprising 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 phospholipid;

[0066] The organic solvent includes xylene, n-butanol, and tributyl acetylcitrate, and the mass ratio of xylene, n-butanol, and tributyl acetylcitrate is 10:5:1; the anti-settling agent is bentonite.

[0067] Example 3

[0068] A high-toughness epoxy coating, comprising 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 phospholipid;

[0069] The organic solvent includes xylene, n-butanol, and tributyl acetylcitrate, and the mass ratio of xylene, n-butanol, and tributyl acetylcitrate is 10:5:1; the anti-settling agent is bentonite.

[0070] Example 4

[0071] A high-toughness epoxy coating, comprising 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 phospholipid;

[0072] The organic solvent includes xylene, n-butanol, and tributyl acetylcitrate, and the mass ratio of xylene, n-butanol, and tributyl acetylcitrate is 10:5:1; the anti-settling agent is bentonite.

[0073] Example 5

[0074] A high-toughness epoxy coating, comprising 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 phospholipid;

[0075] The organic solvent includes xylene, n-butanol, and tributyl acetylcitrate, and the mass ratio of xylene, n-butanol, and tributyl acetylcitrate is 10:5:1; the anti-settling agent is bentonite.

[0076] Example 6

[0077] A high-toughness epoxy coating, comprising 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 phospholipid;

[0078] The organic solvent includes xylene, n-butanol and tributyl acetylcitrate, and the mass ratio of xylene, n-butanol and tributyl acetylcitrate is 10:5:1; the anti-settling agent is bentonite.

[0079] Example 7

[0080] A high-toughness epoxy coating, comprising 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 phospholipid;

[0081] The organic solvent includes xylene, n-butanol and tributyl acetylcitrate, and the mass ratio of xylene, n-butanol and tributyl acetylcitrate is 10:5:1; the anti-settling agent is bentonite.

[0082] Example 8

[0083] A high-toughness epoxy coating, comprising 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 phospholipid;

[0084] The organic solvent includes xylene, n-butanol and tributyl acetylcitrate, and the mass ratio of xylene, n-butanol and tributyl acetylcitrate is 10:5:1; the anti-settling agent is bentonite.

[0085] Example 9

[0086] A high-toughness epoxy coating, comprising 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 phospholipid;

[0087] The organic solvent includes xylene, n-butanol and tributyl acetylcitrate, and the mass ratio of xylene, n-butanol and tributyl acetylcitrate is 10:8:1; the anti-settling agent is bentonite.

[0088] Example 10

[0089] A high-toughness epoxy coating, comprising 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 phospholipid;

[0090] The organic solvent includes xylene, n-butanol and tributyl acetylcitrate, and the mass ratio of xylene, n-butanol and tributyl acetylcitrate is 10:5:1; the anti-settling agent is fumed silica.

[0091] Example 11

[0092] A high-toughness epoxy coating, comprising 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 soy lecithin;

[0093] The organic solvent includes xylene, n-butanol, and tributyl acetylcitrate, and the mass ratio of xylene, n-butanol, and tributyl acetylcitrate is 10:5:1; the anti-settling agent is polyamide wax.

[0094] Comparative Example

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

[0096] The organic solvent includes xylene, n-butanol, and tributyl acetylcitrate, and the mass ratio of xylene, n-butanol, and tributyl acetylcitrate is 10:5:1; the anti-settling agent is bentonite.

[0097] Experimental Method

[0098] The anticorrosive coatings prepared in Experimental Examples 1-14 were sprayed on iron sheets with dimensions of 0.1 cm * 0.1 cm * 0.1 cm. Before spraying, the surface was cleaned with acetone. The spraying thickness was 100 μm ± 5 μm, and the coating film was cured at 25 ± 2 °C. Then, the following performance tests were carried out on the specimens of Experimental Examples 1-14 respectively.

[0099] Among them, the adhesion test was carried out with reference to GB / T5210-2006 "Paints and varnishes - Pull-off test for adhesion";

[0100] The salt spray resistance test was carried out with reference to GB / T1771-2007 "Paints and varnishes - Determination of resistance to neutral salt spray";

[0101] The impact strength test was carried out with reference to GB / T1732-2020 "Determination of impact resistance of films";

[0102] The artificial aging resistance test was carried out with reference to GB / T9276-1996 "Test methods for natural weathering of coatings";

[0103] The wear resistance test was carried out with reference to GB / T1768-2006 "Determination of abrasion resistance of paints and varnishes - Rotating rubber wheel method".

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

[0105] Test items Adhesion / MPa Salt spray resistance / h Impact strength / kg.cm Artificial aging 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 can be seen from Table 1, in the present invention, by using the epoxy polymer elastic resin prepared by modification in the formulation to replace the conventional epoxy resin, the impact strength and weather resistance of the film coating are greatly improved. This is because this epoxy polymer elastomer endows the epoxy resin with the flexibility of rubber, which can greatly improve the flexibility of the epoxy resin. At the same time, the soft olefin polymer itself contains a large number of carbon-sulfur bonds and sulfur-sulfur bonds, and the bond energy is higher than that of carbon-carbon bonds, and its own stability is much higher than that of epoxy resin. In addition, the soft olefin polymer contains a large amount of carbon black with a reinforcing effect, and carbon black is both a black pigment and an ultraviolet absorber, which can absorb ultraviolet light in the paint film, play a role of light shielding, and improve the overall weather resistance of the paint film.

[0108] Although some specific embodiments of the present 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 not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A high-toughness epoxy coating, characterized in that Including: 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 lecithin; The epoxy polymerized elastic resin is prepared by the following method: Step 1, mixing a high polymer elastomer powder and an extracting agent in a mass ratio of 1:3-5, then ultrasonically treating for 10-15 minutes, and then filtering and drying the high polymer elastomer powder in the extracting agent to obtain a soft olefin polymer; The extraction agent includes 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, epichlorohydrin and trimethylolpropane triglycidyl ether are compounded in a mass ratio of 1:0.1-0.3 to prepare a treatment liquid, and then the soft olefin polymer is added to the treatment liquid and soaked 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 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 reactant, and then stirred and allowed to stand, the upper clear liquid is removed, and the remaining lower mixture is retained; Step 3, heating the lower layer mixture at 70-80° C. for 4-5 hours to obtain the epoxy polymerized elastic resin.

2. A high-toughness epoxy coating according to claim 1, characterized in that: The high polymer elastomer powder is submicron rubber powder, and its particle size ranges from 100nm to 1μm.

3. A high-toughness epoxy coating according to claim 1, characterized in that: The organic solvent comprises xylene, n-butanol and acetyl tributyl citrate, and the mass ratio of the xylene, n-butanol and acetyl tributyl citrate is 10-15:5-8:

1.

4. A high-toughness epoxy coating according to claim 1, characterized in that: The anti-settling agent is any one or more of bentonite, fumed silica and polyamide wax.

5. A method for preparing a high-toughness epoxy coating, applied to the preparation of the high-toughness epoxy coating according to any one of claims 1 to 4, characterized in that , including the following method steps: Step S1, weighing the raw materials of each component according to the mass ratio; Step S2, mixing the epoxy polymerized elastic resin and the organic solvent and stirring them evenly, then adding soybean lecithin, dispersing them at 1000-1200 r / min for 20-30 min, and standing them for 3-4 hours; Then disperse at 1500-1800r / min for 20-30min to form a primary mixture; Step S3, adding an anti-settling agent to the primary mixture, and dispersing it evenly at 1500-1800 r / min to form the high-toughness epoxy coating.