A preparation method of a strong and tough epoxy resin, an epoxy resin coating and applications thereof

Abstract

This application belongs to the field of polymer materials, and specifically relates to a preparation method of a strong and tough epoxy resin, an epoxy resin coating and its applications. In the method disclosed in this application, a polyunsaturated acid containing double bonds is epoxidized by ring opening to obtain a compound containing multiple epoxy groups, which is grafted with a 2-(but-3-enoxy)-3-hydroxypropyl acetate polymer after undergoing a polyaddition reaction to obtain a strong and tough epoxy resin. Compared with the existing epoxy resins, the epoxy resin chemically modified in this application has multiple ester-based flexible chains and linear long carbon chains, which improves the hydrophobicity, toughness and plasticity of the epoxy resin, and can be applied to materials such as building exterior wall coatings and high-temperature adhesives, and has better toughness, waterproof performance and weather resistance compared with the existing epoxy resins.

Description

Technical Field

[0001] This application relates to the technical field of polymer materials, and specifically relates to a preparation method of a strong and tough epoxy resin, an epoxy resin coating and its application. Background Art

[0002] Epoxy resin is a kind of polymer, with the molecular formula (C 11 H 12 O3) n . Epoxy resin refers to the general name of a class of polymers containing more than two epoxy groups in the molecule. Epoxy resin is generally used as the matrix in coatings, adhesives and composite materials, and is quite common in various fields of national economic production.

[0003] Among them, the epoxy resin used as a coating accounts for about 35% of the total amount of epoxy resin. At present, the coatings prepared from bisphenol A type epoxy resin are in the majority and have the widest application.

[0004] However, the applicant has found that bisphenol A type epoxy resin has the defects of poor weather resistance and insufficient toughness, which is easy to crack, restricting the application scope of epoxy resin. Summary of the Invention

[0005] In order to improve the weather resistance of epoxy resin, enhance the toughness to reduce the cracking problem, and further expand the application scope of epoxy resin, this application provides a preparation method of a strong and tough epoxy resin, an epoxy resin coating and its application.

[0006] The first aspect of this application discloses a preparation method of a strong and tough epoxy resin, including the following steps:

[0007] Using 2-(but-3-enyloxy)-3-hydroxypropyl acetate as a monomer, through the addition polymerization reaction of the carbon-carbon double bond contained in 2-(but-3-enyloxy)-3-hydroxypropyl acetate, an addition polymer is obtained;

[0008] Epoxidizing a polyunsaturated acid containing double bonds to obtain a long carbon chain epoxide;

[0009] Through a grafting reaction, grafting the addition polymer to the end of the long carbon chain epoxide molecule to obtain a strong and tough epoxy resin.

[0010] Optionally, the addition polymerization reaction adopts the emulsion polymerization method, and the emulsifier used in the emulsion polymerization method includes non-ionic surfactants, and the initiator used includes potassium persulfate or ammonium persulfate.

[0011] Optionally, during the addition polymerization reaction, a colloidal protective agent is added to 2-(but-3-enyloxy)-3-hydroxypropyl acetate.

[0012] Optionally, the polyunsaturated acid containing double bonds includes at least one of linolenic acid, linoleic acid, and arachidonic acid.

[0013] Optionally, the grafting reaction includes an esterification reaction, and the esterification reaction includes continuously stirring the addition polymer and the long carbon chain epoxide for 8 h to 14 h within a temperature range of 100 °C to 140 °C.

[0014] Optionally, the mass ratio of the addition polymer to the long carbon chain epoxide is 1:1.8 to 2.5.

[0015] Optionally, the chemical reaction formula of the addition polymerization reaction is as follows:

[0016]

[0017] Among them, n is an integer multiple of 3 to 12.

[0018] Optionally, the molecular structure of the long carbon chain epoxide includes any one of the following:

[0019]

[0020] The second aspect of the present application discloses a strong and tough epoxy resin coating, which includes the following raw materials in parts by weight:

[0021] 40 - 80 parts of the strong and tough epoxy resin prepared by using any one of the strong and tough epoxy resin preparation methods of the first aspect of the present application, 10 - 25 parts of a film-forming auxiliary agent, 10 - 50 parts of a filler, 10 - 30 parts of a pigment, 0.5 - 2 parts of a glue protecting agent, and 0.5 - 2 parts of a dispersing agent.

[0022] Optionally, the film-forming auxiliary agent includes at least one of propylene glycol monobutyl ether, propylene glycol methyl ether acetate, alcohol ester - 12, and hexylene glycol;

[0023] The filler includes any one of talc powder, calcium carbonate, and silica powder;

[0024] The pigment includes any one of titanium dioxide, chrome yellow, and iron oxide red;

[0025] The glue protecting agent includes polyvinylpyrrolidone;

[0026] The dispersing agent includes any one of guar gum, methyl amyl alcohol, sodium dodecyl sulfate, and sodium tripolyphosphate.

[0027] The third aspect of the present application discloses an application of a strong and tough epoxy resin coating, including the application of the strong and tough epoxy resin coating disclosed in the second aspect in the fields of coatings, electronic packaging, and adhesives.

[0028] Advantages of the present application:

[0029] In this application, 2-(but-3-enyloxy)-3-hydroxypropyl acetate is first used as a monomer for a polyaddition reaction to obtain a polyaddition polymer; then, a polyunsaturated acid containing double bonds is subjected to ring-opening epoxidation to obtain a long carbon chain epoxide; the polyaddition polymer is grafted onto the long carbon chain epoxide to obtain a tough epoxy resin. By chemically modifying the original epoxy resin, the obtained tough epoxy resin has multiple ester-based flexible chains and linear long carbon chains, which helps to improve the weather resistance and toughness of the epoxy resin, reduce the problem of cracking, and expand the application range of the epoxy resin. Description of the Drawings

[0030] Figure 1 It is the nuclear magnetic resonance hydrogen spectrum diagram provided by the embodiment of this application. Detailed Embodiments

[0031] In order to make the objectives, technical solutions, and advantages of this application clearer, the following further details this application in conjunction with embodiments. It should be understood that the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0032] Conventional instrument equipment in the art is used in the technical solutions of this application. For the experimental methods without specific conditions noted in the following embodiments, they are usually carried out under conventional conditions or in accordance with the usage specifications recommended by the manufacturer. Various raw materials used in the following embodiments are all commercially available products unless otherwise stated, and their specifications are conventional specifications in the art. In the specification of this application and the following embodiments, unless otherwise specified, "%" represents weight percentage, "parts" represents weight parts, and the ratio represents weight ratio.

[0033] The first aspect of this application discloses a preparation method of a tough epoxy resin, including the following steps:

[0034] Using 2-(but-3-enyloxy)-3-hydroxypropyl acetate as a monomer, through a polyaddition reaction on the carbon-carbon double bond contained in 2-(but-3-enyloxy)-3-hydroxypropyl acetate, a polyaddition polymer is obtained;

[0035] Performing epoxidation treatment on the polyunsaturated acid containing double bonds to obtain a long carbon chain epoxide;

[0036] Through a grafting reaction, grafting the polyaddition polymer onto the end of the long carbon chain epoxide molecule to obtain a tough epoxy resin.

[0037] In this application, 2-(but-3-enyloxy)-3-hydroxypropyl acetate is used as a monomer for a polyaddition reaction to obtain a polyaddition polymer; then a polyunsaturated acid containing double bonds is subjected to ring-opening epoxidation to obtain a long carbon chain epoxide; the polyaddition polymer is grafted onto the long carbon chain epoxide to obtain a tough epoxy resin. This is a chemical modification of the original epoxy resin, and the obtained toughened epoxy resin has multiple ester-based flexible chains and linear long carbon chains, which helps to improve the weather resistance and toughness of the epoxy resin, reduce the problem of cracking, and expand the application range of the epoxy resin.

[0038] Further, the polyaddition reaction adopts emulsion polymerization, and the emulsifier used in the emulsion polymerization includes non-ionic surfactants, and the initiator used includes potassium persulfate or ammonium persulfate.

[0039] In this application, the non-ionic surfactants include at least one of OP-10, OP-20, fatty alcohol polyoxyethylene ether AEO-9, and fatty acid methyl ester ethoxylate FMEE.

[0040] Further, during the polyaddition reaction, a colloidal protective agent is added to 2-(but-3-enyloxy)-3-hydroxypropyl acetate.

[0041] Further, the polyunsaturated acid containing double bonds includes at least one of linolenic acid, linoleic acid, and arachidonic acid.

[0042] Further, the grafting reaction includes an esterification reaction, and the esterification reaction includes continuously stirring the polyaddition polymer and the long carbon chain epoxide for 8 h to 14 h within the temperature range of 100 °C to 140 °C.

[0043] Further, the mass ratio of the polyaddition polymer to the long carbon chain epoxide is 1:1.8 to 2.5.

[0044] Further, the chemical reaction formula of the polyaddition reaction is as follows:

[0045]

[0046] Among them, n is an integer multiple of 3 to 12.

[0047] Further, the molecular structure of the long carbon chain epoxide includes any one of the following:

[0048]

[0049] This application is described in detail through the following specific examples:

[0050] Add 40 g of deionized water, 0.5 g of emulsifier OP-10 and 3 g of polyethylene glycol to a three-necked flask equipped with a reflux condenser, heat in a water bath at 60 °C, and dissolve with magnetic stirring.

[0051] Weigh 2-(but-3-enyloxy)-3-hydroxypropyl acetate and an initiator in a mass ratio of (6 - 7):1, and prepare for addition polymerization reaction.

[0052] First, add 1 / 5 of the total amount of 2-(but-3-enyloxy)-3-hydroxypropyl acetate, and slowly dropwise add 1 / 5 of the total amount of 10 wt% initiator solution;

[0053] After the reaction of 2-(but-3-enyloxy)-3-hydroxypropyl acetate and the initiator solution for 0.5 h, raise the temperature to 75 °C, dropwise add the remaining 2-(but-3-enyloxy)-3-hydroxypropyl acetate, and at the same time dropwise add the remaining initiator solution, and finish the dropwise addition evenly in about 1 h;

[0054] Continue the reaction for 2 h, after the reaction, cool down to 40 °C, dropwise add a small amount of 50 wt% sodium bicarbonate solution to adjust the pH to weakly alkaline, and obtain the addition polymer.

[0055] Weigh an unsaturated fatty acid containing double bonds and m-chloroperoxybenzoic acid in a mass ratio of 1:(1 - 2.5), and add the two to a three-necked flask equipped with a thermometer;

[0056] Add 50 wt% sodium bicarbonate solution to adjust the pH to weakly alkaline;

[0057] Subsequently, place it in an ice-water bath at 5 °C - 15 °C and stir for 6 h - 12 h to obtain a long carbon chain epoxide.

[0058] Taking α-linolenic acid as an example for the unsaturated fatty acid containing double bonds, the chemical reaction formula is as follows:

[0059]

[0060] Weigh the addition polymer and the long carbon chain epoxide in a mass ratio of (1.8 - 2.5):1, and put them into a three-necked flask equipped with a reflux device;

[0061] Add a small amount of concentrated sulfuric acid to the three-necked flask equipped with a reflux device, then heat in an oil bath at 100 °C - 140 °C, continuously stir and react for 8 h - 14 h, cool down the system to 40 °C, wait for the reflux to end, and then carry out vacuum distillation to remove the excess concentrated sulfuric acid to obtain a tough epoxy resin.

[0062] Taking α-linolenic acid as an example for the unsaturated fatty acid containing double bonds, the chemical reaction formula of the esterification reaction is as follows:

[0063]

[0064] The present invention will be further described below in conjunction with specific preparation examples:

[0065] Preparation Example 1

[0066] Add 40 g of deionized water, 0.5 g of emulsifier OP-10, and 3 g of polyethylene glycol to a three-necked flask equipped with a reflux condenser, and then heat in a water bath at 60 °C and stir magnetically to dissolve;

[0067] Add 3 g of 2-(but-3-enyloxy)-3-hydroxypropyl acetate, slowly dropwise add 0.5 g of 10 wt% ammonium persulfate solution. After the two react for 0.5 h, raise the temperature to 75 °C, dropwise add 12 g of 2-(but-3-enyloxy)-3-hydroxypropyl acetate, and at the same time dropwise add 2 g of ammonium persulfate solution. Finish dropping in about 1 h;

[0068] Continue to react for 2 h. After completion, cool down to 40 °C, dropwise add 4 g of 50 wt% sodium bicarbonate solution to adjust the pH to weakly alkaline to obtain a polyaddition polymer.

[0069] Weigh 20 g of α-linolenic acid and 25 g of m-chloroperoxybenzoic acid, add the two to a three-necked flask equipped with a thermometer, then add 8 g of 50 wt% sodium bicarbonate solution, and then stir and react in an ice-water bath at 5 °C - 15 °C for 8 h to obtain a long-chain epoxide.

[0070] Weigh 10 g of the polyaddition polymer and 18 g of the long-chain epoxide, put them into a three-necked flask equipped with a reflux device, add 2 g of concentrated sulfuric acid, then heat in an oil bath at 110 °C and stir and react for 10 h. Cool down the system to 40 °C. After waiting for the reflux to end, carry out vacuum distillation to remove the excess concentrated sulfuric acid to obtain a tough epoxy resin.

[0071] Preparation Example 2

[0072] Add 40 g of deionized water, 0.5 g of emulsifier OP-10, and 3 g of polyethylene glycol to a three-necked flask equipped with a reflux condenser, and then heat in a water bath at 60 °C and stir magnetically to dissolve;

[0073] Add 3 g of 2-(but-3-enyloxy)-3-hydroxypropyl acetate, slowly dropwise add 0.5 g of 10 wt% ammonium persulfate solution. After the two react for 0.5 h, raise the temperature to 75 °C, dropwise add 12 g of 2-(but-3-enyloxy)-3-hydroxypropyl acetate, and at the same time dropwise add 2 g of ammonium persulfate solution. Finish dropping in about 1 h;

[0074] Continue to react for 2 h. After completion, cool down to 40 °C, dropwise add 4 g of 50 wt% sodium bicarbonate solution to adjust the pH to weakly alkaline to obtain a polyaddition polymer.

[0075] Weigh 20 g of linoleic acid and 20 g of m-chloroperbenzoic acid, add the two into a three-necked flask equipped with a thermometer, then add 8 g of 50 wt% sodium bicarbonate solution, and then stir and react in an ice-water bath at 5 °C to 15 °C for 8 h to obtain a long-chain epoxide.

[0076] Weigh 10 g of the addition polymer and 18 g of the long-chain epoxide, put them into a three-necked flask equipped with a reflux device, add 2 g of concentrated sulfuric acid, then carry out an oil bath heating at 110 °C, stir and react for 10 h, cool the system to 40 °C, and after waiting for the reflux to end, carry out vacuum distillation to remove the excess concentrated sulfuric acid to obtain a tough epoxy resin.

[0077] Preparation Example 3

[0078] Add 40 g of deionized water, 0.5 g of emulsifier OP-10 and 3 g of polyethylene glycol into a three-necked flask equipped with a reflux condenser, then carry out a water bath heating at 60 °C and stir to dissolve magnetically;

[0079] Add 3 g of 2-(but-3-enyloxy)-3-hydroxypropyl acetate, slowly dropwise add 0.5 g of 10 wt% ammonium persulfate solution, after the two react for 0.5 h, raise the temperature to 75 °C, dropwise add 12 g of 2-(but-3-enyloxy)-3-hydroxypropyl acetate, and at the same time dropwise add 2 g of ammonium persulfate solution, and finish dropping in about 1 h;

[0080] Continue to react for 2 h, after completion, cool to 40 °C, dropwise add 4 g of 50 wt% sodium bicarbonate solution to adjust the pH to weakly alkaline to obtain the addition polymer.

[0081] Weigh 20 g of arachidonic acid and 40 g of m-chloroperbenzoic acid, add the two into a three-necked flask equipped with a thermometer, then add 15 g of 50 wt% sodium bicarbonate solution, and then stir and react in an ice-water bath at 5 °C to 15 °C for 8 h to obtain a long-chain epoxide.

[0082] Weigh 10 g of the addition polymer and 18 g of the long-chain epoxide, put them into a three-necked flask equipped with a reflux device, add 2 g of concentrated sulfuric acid, then carry out an oil bath heating at 110 °C, stir and react for 10 h, cool the system to 40 °C, and after waiting for the reflux to end, carry out vacuum distillation to remove the excess concentrated sulfuric acid to obtain a tough epoxy resin.

[0083] Preparation Example 4

[0084] Add 40 g of deionized water, 0.5 g of emulsifier OP-10 and 3 g of polyethylene glycol into a three-necked flask equipped with a reflux condenser, then carry out a water bath heating at 60 °C and stir to dissolve magnetically;

[0085] Add 3 g of 2-(but-3-enyloxy)-3-hydroxypropyl acetate, slowly dropwise add 0.5 g of 10 wt% ammonium persulfate solution. After the two react for 0.5 h, raise the temperature to 75 °C, dropwise add 12 g of 2-(but-3-enyloxy)-3-hydroxypropyl acetate, and at the same time dropwise add 2.2 g of ammonium persulfate solution. Finish the dropwise addition in about 1 h.

[0086] Continue the reaction for 2 h. After the reaction is completed, cool down to 40 °C, dropwise add 2 g of 50 wt% sodium bicarbonate solution to adjust the pH to weakly alkaline to obtain a polyaddition polymer.

[0087] Weigh 40 g of α-linolenic acid and 45 g of m-chloroperbenzoic acid, add the two into a three-necked flask equipped with a thermometer, then add 15 g of 50 wt% sodium bicarbonate solution, and then stir and react in an ice-water bath at 5 °C - 15 °C for 10 h to obtain a long carbon chain epoxide.

[0088] Weigh 10 g of the polyaddition polymer and 18 g of the long carbon chain epoxide, put them into a three-necked flask equipped with a reflux device, add 2 g of concentrated sulfuric acid, then carry out an oil bath heating at 110 °C, stir and react for 10 h. Cool down the system to 40 °C. After waiting for the reflux to end, carry out reduced pressure distillation to remove the excess concentrated sulfuric acid to obtain a strong and tough epoxy resin.

[0089] The second aspect of this application discloses a strong and tough epoxy resin coating, which comprises the following raw materials in parts by weight: 40 - 80 parts of the strong and tough epoxy resin prepared by the preparation method of the strong and tough epoxy resin in the first aspect of this application, 10 - 25 parts of a film-forming aid, 10 - 50 parts of a filler, 10 - 30 parts of a pigment, 0.5 - 2 parts of a glue preservative, and 0.5 - 2 parts of a dispersant.

[0090] Further, the film-forming aid includes at least one of propylene glycol dibutyl ether, propylene glycol methyl ether acetate, alcohol ester - 12, and hexanediol;

[0091] The filler includes any one of talcum powder, calcium carbonate, and silica powder;

[0092] The pigment includes any one of titanium dioxide, chrome yellow, and iron red;

[0093] The glue preservative includes polyvinylpyrrolidone;

[0094] The dispersant includes any one of guar gum, methyl amyl alcohol, sodium dodecyl sulfate, and sodium tripolyphosphate.

[0095] The following further illustrates the present invention in combination with specific examples and tables:

[0096] Example

[0097] Preparation Examples 1 to 4 were obtained by a preparation method of a tough epoxy resin, and were respectively formulated into an emulsion-type coating according to the following composition to prepare Examples 1 to 6, obtaining 24 groups of tough epoxy resin coatings and 2 groups of comparative examples. The specific situation is shown in Table 1:

[0098] Table 1 Composition ratio table of each component of Examples 1 to 6 and Comparative Examples 1 to 2

[0099]

[0100]

[0101] (1) Examples 1 to 6 and Comparative Examples 1 to 2 were cured into films and naturally dried for 24 h, and then their properties were tested. Three samples were taken from 24 groups of tough epoxy resin coatings and 2 groups of comparative examples for testing, and the results were averaged. The obtained results are shown in Table 2:

[0102] Table 2 Test result table of each item of Examples 1 to 6 and Comparative Examples 1 to 2

[0103] Product Tensile strength / Mpa Feeling of paint film High temperature test (110°C * 1h) Example 1 68.33 Soft No cracking, no peeling Example 2 65.53 Soft No cracking, no peeling Example 3 67.91 Soft No cracking, no peeling Example 4 77.75 Soft No cracking, no peeling Example 5 77.85 Soft No cracking, no peeling Example 6 76.33 Soft No cracking, no peeling Comparative example 1 40.02 Medium hard Mostly cracked and peeled Comparative example 2 30.33 Hard All cracked and peeled

[0104] (2) The remaining samples of Preparation Examples 1 to 4 were stored in different conditions in a sealed manner and their properties were tested. The test results are shown in Table 3:

[0105] Table 3 Stability test result table of Preparation Examples 1 to 4 under different conditions

[0106]

[0107] From the test results in Table 3 above, it can be seen that the comprehensive performance of the tough epoxy resin provided by the preparation examples of the present application is higher than that of the bisphenol A epoxy resin coating sold on the market. The tough epoxy resin plays a role in increasing toughness and weather resistance, has the advantage of high-temperature stability, and the emulsion-type epoxy resin has good stability. The products produced in actual production can be stored and used for a long time when stored in a cool and ventilated place.

[0108] Characterization and testing

[0109] In order to characterize the structural characteristics of a tough epoxy resin prepared by the above preparation examples of the present application, a nuclear magnetic resonance hydrogen spectrum test was carried out on the tough epoxy resin synthesized in Preparation Example 4. The nuclear magnetic resonance hydrogen spectrum is as Figure 1 shown, and the test results are as follows:

[0110] 11H NMR (300 MHz, DMSO): δ 4.48 (q, H), 4.32 (q, H), 4.07 (q, H), 3.35 (t, H), 2.34 (m, H), 2.04 (s, H), 1.66 (t, H), 1.55 (m, H), 1.51 (m, H), 1.44 (m, H), 1.40 - 1.38 (s, H), 1.33 (m, H), 1.25 (d, H), 0.99 (t, H), 0.89 - 0.86 (m, H) ppm.

[0111] From the test results of the 1H NMR, it can be seen that the present invention has successfully prepared a tough epoxy resin with the target structure. This tough epoxy resin has high weather resistance and toughness.

[0112] The third aspect of this application discloses the application of a tough epoxy resin coating, including the application of the tough epoxy resin coating disclosed in the second aspect in the fields of coatings, electronic packaging, and adhesives.

[0113] In a feasible application, the tough epoxy resin coating can be applied to the exterior walls of buildings.

[0114] The above has described this application in detail in combination with specific embodiments and exemplary examples, but these descriptions should not be construed as limiting this application. Those skilled in the art understand that without departing from the spirit and scope of this application, various equivalent replacements, modifications, or improvements can be made to the technical solutions and their implementation manners of this application, and all of these fall within the scope of this application. The protection scope of this application is subject to the appended claims.

Claims

1. A preparation method of a strong and tough epoxy resin, characterized in that, It includes the following steps: Using 2-(but-3-enyloxy)-3-hydroxypropyl acetate as a monomer, a polyaddition polymer is obtained by performing a polyaddition reaction on the carbon-carbon double bond contained in 2-(but-3-enyloxy)-3-hydroxypropyl acetate; Performing epoxidation treatment on at least one of linolenic acid, linoleic acid, and arachidonic acid to obtain a long carbon chain epoxide; Through a grafting reaction, grafting the polyaddition polymer to the end of the long carbon chain epoxide molecule to obtain a tough epoxy resin.

2. The preparation method of the tough epoxy resin according to claim 1, wherein, The polyaddition reaction adopts emulsion polymerization. The emulsifier used in emulsion polymerization includes non-ionic surfactants, and the initiator used includes potassium persulfate or ammonium persulfate.

3. The method for preparing a tough epoxy resin according to claim 1, wherein, It also includes: During the polyaddition reaction, a colloidal protective agent is added to 2-(but-3-enyloxy)-3-hydroxypropyl acetate.

4. The method for preparing a tough epoxy resin according to claim 1, characterized in that, The grafting reaction includes an esterification reaction. The esterification reaction includes continuously stirring the polyaddition polymer and the long carbon chain epoxide for 8 h to 14 h within the temperature range of 100 °C to 140 °C.

5. The method for preparing a strong and tough epoxy resin according to claim 1, characterized in that, The mass ratio of the polyaddition polymer to the long carbon chain epoxide is 1:1.8 to 2.

5.

6. The method for preparing a strong and tough epoxy resin according to claim 1, characterized in that, The chemical reaction formula of the polyaddition reaction is as follows: Wherein, n is an integer multiple of 3 to 12; The molecular structure of the long carbon chain epoxide includes any one of the following:

7. A tough epoxy resin coating, characterized in that, It includes the following raw materials in parts by weight: 40 - 80 parts of the tough epoxy resin prepared by using the preparation method of the tough epoxy resin described in any one of claims 1 - 6, 10 - 25 parts of a film-forming aid, 10 - 50 parts of a filler, 10 - 30 parts of a pigment, 0.5 - 2 parts of a colloid protection agent, and 0.5 - 2 parts of a dispersant.

8. The tough epoxy resin coating according to claim 7, characterized in that The film-forming aid includes at least one of propylene glycol monobutyl ether, propylene glycol methyl ether acetate, alcohol ester - 12, and hexylene glycol; The filler includes any one of talc powder, calcium carbonate, and silica powder; The pigment includes any one of titanium dioxide, chrome yellow, and iron oxide red; The colloid protection agent includes polyvinylpyrrolidone; The dispersant includes any one of guar gum, sodium dodecyl sulfate, and sodium tripolyphosphate.

9. Application of a strong and tough epoxy resin coating, characterized in that, It includes the application of the tough epoxy resin coating described in claim 7 or 8 in the fields of coatings, electronic packaging, and adhesives.

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