Preparation process of waterproof and oil-proof epoxy resin coating

Abstract

The invention discloses a preparation process of a waterproof and oil-proof epoxy resin coating, and relates to the technical field of functional coatings, and the preparation process comprises the following steps: S1, adding an epoxy-terminated organosilicon oligomer into epoxy resin E-51; the preparation method has the advantages that an intrinsic lyophobic-damage self-healing integrated protection system is constructed by synergistically compounding an organic silicon component which has low surface energy and can be chemically bonded with a double-component microcapsule in which a fluorine-containing repairing monomer and a latent curing agent are packaged; according to the technology, the defects that a traditional blending modifier is prone to migration and failure and single in function are overcome, long-term stability of coating basic protection performance and intelligent in-situ recovery of special functions after damage are achieved, the reliability of the protective coating is remarkably improved, and the service life of the protective coating is remarkably prolonged; and the method has a wide application prospect in the fields with harsh reliability requirements, such as high-end electronic packaging, marine corrosion prevention, precise instrument protection and the like.

Description

Technical Field

[0001] This invention relates to the field of functional coatings technology, and in particular to a preparation process for a waterproof and oil-resistant epoxy resin coating. Background Technology

[0002] Epoxy resin is a high-molecular prepolymer containing two or more epoxy groups. After cross-linking with a curing agent, it can form a three-dimensional network structure. With its excellent adhesion, mechanical strength, chemical resistance and electrical insulation properties, it is widely used as a protective coating, composite matrix and adhesive. Waterproof and oil-proof epoxy resin coatings are based on this, and through molecular design or composite technology, their cured coatings have extremely high contact angles and significant roll-off effects with liquids such as water and oil, thereby achieving active isolation and protection of the substrate.

[0003] Existing technologies primarily employ physical blending of fluorine- or silicon-containing low surface energy additives to impart waterproof and oil-repellent properties to epoxy resins. While this method is simple, the additives exhibit poor compatibility with the epoxy matrix, easily migrating and precipitating during curing or long-term use, leading to surface performance degradation and even defects. Therefore, a new preparation process for waterproof and oil-repellent epoxy resin coatings needs to be designed. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a preparation process for waterproof and oil-resistant epoxy resin coatings, solving the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A process for preparing a waterproof and oil-resistant epoxy resin coating includes the following steps: Step S1: Add the terminal epoxy group organosilicon oligomer to epoxy resin E-51, add butyl acetate and wetting and dispersing agent, stir at 300-500 rpm for 10-20 min to obtain a premix; Step S2: Add the fluorinated epoxy monomer microcapsules and curing agent microcapsules to the premixed liquid, stir at 200-400 rpm for 15-25 minutes, add the defoamer, stir at 200-400 rpm for 4-8 minutes to obtain a waterproof and oil-proof epoxy resin coating. This process achieves a balance between durable protection and intelligent repair through the synergistic effect of terminal epoxy group organosilicon oligomers and fluorinated epoxy monomer microcapsules. The organosilicon component provides a stable, low surface energy substrate through chemical bonding in the resin network, giving the coating basic hydrophobic and oleophobic properties. When the coating is damaged, the microcapsules rupture, and the released fluorinated monomers react in situ with the curing agent to reconstruct a highly hydrophobic and oleophobic barrier at the damaged site. Thus, the process synergistically ensures the long-lasting protective function and self-healing properties of the coating at both the molecular and macroscopic repair levels.

[0006] Furthermore, in step S1, the mass ratio of epoxy resin E-51, terminal epoxy organosilicon oligomer, butyl acetate, and wetting and dispersing agent is 100:30-35:4-6:0.7-0.9. The mass ratio of the fluorinated epoxy monomer microcapsules, curing agent microcapsules, premixed liquid and defoamer in step S2 is 1:0.2-0.3:20-25:0.01-0.02.

[0007] Furthermore, the preparation steps of the terminal epoxy group organosilicon oligomer in step S1 are as follows: Step A1: Under a nitrogen atmosphere, add anhydrous toluene to end-hydrogen silicone oil, heat to 80-90℃, stir at 200-300 rpm for 8-12 minutes to obtain silicone oil solution; Step A2: Under a nitrogen atmosphere, allyl glycidyl ether is added to a silicone oil solution, heated to 85-95℃, stirred at 120-180 rpm for 6-8 min, platinum catalyst is added, stirred at 200-400 rpm for 8-12 min until the reaction is complete, and the reaction solution is obtained. The solution is then cooled to 20-30℃ and depressurized to -0.08 MPa to -0.09 MPa, subjected to vacuum distillation, filtered, heated to 100-120℃, stirred at 200-300 rpm for 1-2 h to obtain terminal epoxy organosilicon oligomers. This step achieves precise integration of function and structure through the synergistic reaction of terminal hydrogen-containing silicone oil and allyl glycidyl ether. The terminal hydrogen-containing silicone oil provides a flexible, low surface energy organosilicon backbone, while the allyl glycidyl ether completes hydrosilylation reaction and subsequent epoxy crosslinking through its allyl and epoxy groups, respectively. The combination of the two gives the product excellent hydrophobic and oleophobic properties, and it can also form a stable chemical bond with the host resin through the terminal epoxy groups, thereby avoiding small molecule migration and ensuring the long-lasting and stable modification effect.

[0008] Furthermore, the mass ratio of the hydrogen-containing silicone oil to anhydrous toluene in step A1 is 1:0.3-0.5; The mass ratio of the silicone oil solution to allyl glycidyl ether in step A2 is 1:0.14-0.2.

[0009] Furthermore, the preparation steps of the fluorinated epoxy monomer microcapsules in step S2 are as follows: Perfluorooctyl ethyl glycidyl ether, toluene-2,4-diisocyanate, and lauryl alcohol polyoxyethylene ether were added to cyclohexane and stirred at 2000-3000 rpm for 8-12 min. Then, ethylenediamine was added and stirred at 200-300 rpm for 20-30 min. The mixture was filtered and dried to obtain fluorinated epoxy monomer microcapsules. The mass ratio of perfluorooctyl ethyl glycidyl ether, toluene-2,4-diisocyanate, lauryl polyoxyethylene ether, cyclohexane and ethylenediamine is 1:0.5-0.7:0.06-0.1:8-12:0.5-0.8; This step utilizes the synergistic reaction system of perfluorooctyl ethyl glycidyl ether with toluene-2,4-diisocyanate and ethylenediamine to construct a smart microcapsule of "functional core material-tough wall material," achieving long-term storage and on-demand release of functional active substances, and endowing the coating with intelligent response characteristics of rapid self-repair after damage.

[0010] Furthermore, the preparation steps of the curing agent microcapsules in step S2 are as follows: Step B1: Add gelatin to deionized water, heat to 50-55℃, stir at 100-200 rpm for 20-30 minutes to obtain a gelatin solution. Step B2: Add gum arabic to deionized water, heat to 50-55℃, stir at 100-200 rpm for 20-30 minutes to obtain gum arabic solution; Step B3: Add the gum arabic solution to the gelatin solution, heat to 50-55℃, stir at 100-200 rpm for 10-20 min, add 1 wt% acetic acid solution to adjust the pH to 4.0-4.5, add 2-ethyl-4-methylimidazole, stir at 2000-3000 rpm for 10-12 min, add deionized water, stir at 300-400 rpm for 20-40 min, cool to 20-30℃, add 10 wt% sodium hydroxide aqueous solution to adjust the pH to 9.0-9.5, add the crosslinking agent glutaraldehyde, stir at 600-800 rpm for 10-12 min, filter, and dry to obtain curing agent microcapsules; This step, through the synergy of gelatin and gum arabic composite wall material and glutaraldehyde crosslinking agent, constructs stable and intelligently responsive microcapsules, achieving tight encapsulation and long-term protection of the curing agent, and ensuring that it can rupture and release in time when the coating is damaged, triggering precise repair.

[0011] Furthermore, the mass ratio of gelatin to deionized water in step B1 is 1:30-36; The mass ratio of gum arabic to deionized water in step B2 is 1:28-34; The mass ratio of the gelatin solution, gum arabic solution, 2-ethyl-4-methylimidazole and deionized water in step B3 is 1:1-1.2:0.02-0.03:68-72.

[0012] A process for preparing a waterproof and oil-resistant coating includes the following steps: Add polyetheramine D-230 and the catalyst dibutyltin dilaurate to the above-mentioned waterproof and oil-proof epoxy resin coating, stir at 400-600 rpm for 6-8 minutes, apply to the substrate, heat to 75-80℃, cure for 20-40 minutes, heat to 115-125℃, and cure for 1.5-2.5 hours to obtain a waterproof and oil-proof coating.

[0013] Furthermore, the mass ratio of the polyetheramine D-230 to the waterproof and oil-resistant epoxy resin coating is 1:3.8-4.2.

[0014] The beneficial effects of this invention are as follows: This invention provides a preparation process for a waterproof and oil-resistant epoxy resin coating. By synergistically compounding a low-surface-energy, chemically bondable organosilicon component with a two-component microcapsule encapsulating a fluorinated repair monomer and a latent curing agent, an integrated protective system of "intrinsically hydrophobic and self-healing damage" is constructed. Compared with existing technologies, this technology overcomes the defects of traditional blending modifiers, such as easy migration failure and single function. It achieves long-term stability of the coating's basic protective performance and intelligent in-situ recovery of special functions after damage, significantly improving the reliability and service life of the protective coating. It has broad application prospects in fields with stringent reliability requirements, such as high-end electronic packaging, marine corrosion protection, and precision instrument protection. Attached Figure Description

[0015] Figure 1 This is a flow chart illustrating the preparation process of a waterproof and oil-resistant epoxy resin coating proposed in this invention. Detailed Implementation

[0016] Reference Figure 1 To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments.

[0017] Example 1: Preparation of epoxy-terminated organosilicon oligomers S1: Under a nitrogen atmosphere, 600g of anhydrous toluene was added to 2000g of hydrogen-terminated silicone oil, heated to 90℃, stirred at 200rpm for 12min to obtain a silicone oil solution. S2: Under a nitrogen atmosphere, 280g of allyl glycidyl ether was added to 2000g of silicone oil solution, heated to 95℃, stirred at 120rpm for 8min, platinum catalyst was added, and the reaction was stirred at 200rpm for 12min until the reaction was complete, and the reaction solution was obtained. The solution was cooled to 20℃, depressurized to -0.09MPa, distilled under reduced pressure, filtered, heated to 100℃, stirred at 300rpm for 1h, and the terminal epoxy organosilicon oligomer was obtained.

[0018] Example 2: Preparation of epoxy-terminated organosilicon oligomers S1: Under a nitrogen atmosphere, 800g of anhydrous toluene was added to 2000g of hydrogen-terminated silicone oil, the temperature was raised to 85℃, the stirring speed was 250rpm, and the mixture was stirred for 10min to obtain a silicone oil solution. S2: Under a nitrogen atmosphere, 340g of allyl glycidyl ether was added to 2000g of silicone oil solution. The mixture was heated to 90℃, stirred at 150rpm for 7min, and then a platinum catalyst was added. The mixture was stirred at 300rpm for 10min until the reaction was complete. The reaction solution was then cooled to 25℃ and depressurized to -0.085MPa. The solution was then distilled under reduced pressure, filtered, heated to 110℃, stirred at 250rpm for 1.5h, and the terminal epoxy organosilicon oligomer was obtained.

[0019] Example 3: Preparation of epoxy-terminated organosilicon oligomers S1: Under a nitrogen atmosphere, 1000g of anhydrous toluene was added to 2000g of hydrogen-terminated silicone oil, heated to 80℃, stirred at 300rpm for 8min to obtain a silicone oil solution. S2: Under a nitrogen atmosphere, 400g of allyl glycidyl ether was added to 2000g of silicone oil solution, heated to 85℃, stirred at 180rpm for 6min, platinum catalyst was added, and the reaction was stirred at 400rpm for 8min. After the reaction was completed, the reaction solution was obtained, cooled to 30℃, depressurized to -0.08MPa, distilled under reduced pressure, filtered, heated to 120℃, stirred at 200rpm for 2h to obtain terminal epoxy organosilicon oligomer.

[0020] Example 4: Preparation of Fluorinated Epoxy Monomer Microcapsules 100g of perfluorooctyl ethyl glycidyl ether, 50g of toluene-2,4-diisocyanate, and 10g of lauryl polyoxyethylene ether were added to 800g of cyclohexane and stirred at 3000rpm for 8min. Then, 80g of ethylenediamine was added and stirred at 200rpm for 30min. The mixture was filtered and dried to obtain fluorinated epoxy monomer microcapsules.

[0021] Example 5: Preparation of Fluorinated Epoxy Monomer Microcapsules 100g of perfluorooctyl ethyl glycidyl ether, 60g of toluene-2,4-diisocyanate, and 8g of lauryl polyoxyethylene ether were added to 1000g of cyclohexane and stirred at 2500rpm for 10min. Then, 65g of ethylenediamine was added and stirred at 250rpm for 25min. The mixture was filtered and dried to obtain fluorinated epoxy monomer microcapsules.

[0022] Example 6: Preparation of Fluorinated Epoxy Monomer Microcapsules 100g of perfluorooctyl ethyl glycidyl ether, 70g of toluene-2,4-diisocyanate, and 6g of lauryl polyoxyethylene ether were added to 1200g of cyclohexane and stirred at 2000rpm for 12min. Then, 50g of ethylenediamine was added and stirred at 300rpm for 20min. The mixture was filtered and dried to obtain fluorinated epoxy monomer microcapsules.

[0023] Example 7: Preparation of curing agent microcapsules S1: Add 100g of gelatin to 3000g of deionized water, heat to 55℃, stir at 100rpm for 30min to obtain a gelatin solution. S2: Add 100g of gum arabic to 2800g of deionized water, heat to 55℃, stir at 100rpm for 30min to obtain gum arabic solution. S3: Add 1000g of gum arabic solution to 1000g of gelatin solution, heat to 55℃, stir at 100rpm for 20min, add 1wt% acetic acid solution to adjust pH to 4.0-4.5, add 2g of 2-ethyl-4-methylimidazole, stir at 3000rpm for 10min, add 7200g of deionized water, stir at 300rpm for 40min, cool to 20℃, add 10wt% sodium hydroxide aqueous solution to adjust pH to 9.0-9.5, add crosslinking agent glutaraldehyde, stir at 800rpm for 10min, filter, and dry to obtain curing agent microcapsules.

[0024] Example 8: Preparation of curing agent microcapsules S1: Add 100g of gelatin to 3300g of deionized water, heat to 53℃, stir at 150rpm for 25min to obtain a gelatin solution. S2: Add 100g of gum arabic to 3100g of deionized water, heat to 53℃, stir at 150rpm for 25min to obtain gum arabic solution. S3: Add 1100g of gum arabic solution to 1000g of gelatin solution, heat to 53℃, stir at 150rpm for 15min, add 1wt% acetic acid solution to adjust pH to 4.0-4.5, add 2.5g of 2-ethyl-4-methylimidazole, stir at 2500rpm for 11min, add 7000g of deionized water, stir at 350rpm for 30min, cool to 25℃, add 10wt% sodium hydroxide aqueous solution to adjust pH to 9.0-9.5, add crosslinking agent glutaraldehyde, stir at 700rpm for 11min, filter, and dry to obtain curing agent microcapsules.

[0025] Example 9: Preparation of curing agent microcapsules S1: Add 100g of gelatin to 3600g of deionized water, heat to 50℃, stir at 200rpm for 20min to obtain a gelatin solution. S2: Add 100g of gum arabic to 3400g of deionized water, heat to 50℃, stir at 200rpm for 20min to obtain gum arabic solution. S3: Add 1200g of gum arabic solution to 1000g of gelatin solution, heat to 50℃, stir at 200rpm for 10min, add 1wt% acetic acid solution to adjust pH to 4.0-4.5, add 3g of 2-ethyl-4-methylimidazole, stir at 2000rpm for 12min, add 6800g of deionized water, stir at 400rpm for 20min, cool to 30℃, add 10wt% sodium hydroxide aqueous solution to adjust pH to 9.0-9.5, add crosslinking agent glutaraldehyde, stir at 600rpm for 12min, filter, and dry to obtain curing agent microcapsules.

[0026] Example 10: Preparation of Waterproof and Oil-Repellent Epoxy Resin Coating S1: Add 600g of terminal epoxy organosilicon oligomer to 2000g of epoxy resin E-51, add 120g of butyl acetate and 14g of wetting and dispersing agent, stir at 500rpm for 10min to obtain a premix. S2: Add 100g of fluorinated epoxy monomer microcapsules and 20g of curing agent microcapsules to 2500g of premixed liquid, stir at 200rpm for 25min, add 1g of defoamer, stir at 400rpm for 4min to obtain waterproof and oil-proof epoxy resin coating. S3: Add 500g of polyetheramine D-230 and the catalyst dibutyltin dilaurate to 1900g of waterproof and oil-proof epoxy resin coating, stir at 600rpm for 6min, apply to the substrate, heat to 80℃, cure for 20min, heat to 125℃, and cure for 1.5min to obtain a waterproof and oil-proof coating.

[0027] Example 11: Preparation of Waterproof and Oil-Repellent Epoxy Resin Coating S1: Add 650g of terminal epoxy organosilicon oligomer to 2000g of epoxy resin E-51, add 100g of butyl acetate and 16g of wetting and dispersing agent, stir at 400rpm for 15min to obtain a premix. S2: Add 100g of fluorinated epoxy monomer microcapsules and 25g of curing agent microcapsules to 2250g of premixed liquid, stir at 300rpm for 20min, add 1.5g of defoamer, stir at 300rpm for 6min to obtain waterproof and oil-proof epoxy resin coating. S3: Add 500g of polyetheramine D-230 and the catalyst dibutyltin dilaurate to 2000g of waterproof and oil-proof epoxy resin coating, stir at 500rpm for 7min, apply to the substrate, heat to 78℃ and cure for 30min, then heat to 120℃ and cure for 2h to obtain a waterproof and oil-proof coating.

[0028] Example 12: Preparation of Waterproof and Oil-Repellent Epoxy Resin Coating S1: Add 700g of terminal epoxy organosilicon oligomer to 2000g of epoxy resin E-51, add 80g of butyl acetate and 18g of wetting and dispersing agent, stir at 300rpm for 20min to obtain a premix. S2: Add 100g of fluorinated epoxy monomer microcapsules and 30g of curing agent microcapsules to 2000g of premixed liquid, stir at 400rpm for 15min, add 2g of defoamer, stir at 200rpm for 8min to obtain waterproof and oil-proof epoxy resin coating. S3: Add 500g of polyetheramine D-230 and the catalyst dibutyltin dilaurate to 2100g of waterproof and oil-proof epoxy resin coating, stir at 400rpm for 8min, apply to the substrate, heat to 75℃ and cure for 40min, then heat to 115℃ and cure for 2.5h to obtain a waterproof and oil-proof coating.

[0029] Comparative Example 1: Compared with Example 10, this comparative example only omits the wetting and dispersing agent in process S1. All other steps and parameters are the same, and will not be repeated here. The final result is a waterproof and oil-proof coating.

[0030] Comparative Example 2: Compared with Example 10, this comparative example only replaces the terminal epoxy organosilicon oligomer in process S1 with dimethyl hydroxy silicone oil. All other steps and parameters are the same, and will not be repeated here. The final result is a waterproof and oil-proof coating.

[0031] Performance testing: Adhesion test: According to the GB / T 9286-2021 testing standard, the following tests were conducted using a cross-cut tester, transparent pressure-sensitive tape, and a magnifying glass: 1. Take a cold-rolled steel plate of 150mm×70mm×1.0mm, and evenly apply the coatings obtained from each embodiment and comparative example onto it, controlling the dry film thickness to be (60±5)μm, and make an adhesion test sample. 2. Use a grid cutter to draw 6 horizontal and 6 vertical cutting lines on the coating surface to form 25 squares. Ensure that all cutting lines penetrate the coating to the metal substrate. Use a soft brush to sweep along the diagonal direction 5 times to remove debris. Place the tape in the center of the grid and rub it firmly with your fingertips to make it completely adhered. 3. After applying the tape for (90±30) seconds, hold one end of the tape and peel it off smoothly at an angle of approximately 60° within 0.5-1.0 seconds. Immediately check the grid area with a magnifying glass and compare it with the standard grading chart. Count the number of squares where the paint film has peeled off, calculate the percentage of peeling off, and record the adhesion grade (0 is the best, 5 is the worst).

[0032] Table 1 Adhesion test results

[0033] Data Analysis: As can be seen from Table 1, the waterproof and oil-resistant epoxy resin coating prepared in the embodiments of the present invention exhibits excellent adhesion. This proves that the present invention has successfully constructed a uniform and robust coating system through the synergistic effect of the chemical bonding of terminal epoxy group organosilicon oligomers and the interfacial stabilizing effect of wetting and dispersing agents, laying a solid mechanical foundation for achieving long-term protective function.

[0034] In contrast, Comparative Example 1 showed a significant decrease in adhesion because no wetting and dispersing agent was added during the preparation process. This was because the lack of a wetting and dispersing agent resulted in poor compatibility between the terminal epoxy group organosilicon oligomer and the epoxy resin E-51, leading to severe phase separation and the formation of a large number of weak boundary layers and defects inside the coating and at the interface between the coating and the substrate. In contrast, Comparative Example 2, where the terminal epoxy group organosilicon oligomer was replaced with dimethyl hydroxy silicone oil, completely failed in adhesion. This is because the terminal hydroxyl groups of dimethyl hydroxy silicone oil have low activity and cannot undergo copolymerization with epoxy resin and amine curing agents to form chemical bonds. It exists in the system only in the form of physical blending. During the curing process, the silicone oil tends to migrate and accumulate at the interface between the coating and the substrate, forming a weak interface layer. This layer not only fails to provide effective adhesion but also severely hinders the formation of strong chemical bonds and mechanical interlocks between the epoxy resin and the metal substrate, ultimately resulting in the coating being almost unable to adhere to the substrate.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A preparation process for a waterproof and oil-resistant epoxy resin coating, characterized in that, Includes the following steps: Step S1: Add the terminal epoxy group organosilicon oligomer to epoxy resin E-51, add butyl acetate and wetting and dispersing agent, stir for 10-20 min to obtain a premix; Step S2: Add the fluorinated epoxy monomer microcapsules and curing agent microcapsules to the premixed liquid, stir for 15-25 minutes, add the defoamer, stir for 4-8 minutes, and obtain a waterproof and oil-proof epoxy resin coating.

2. The preparation process of a waterproof and oil-resistant epoxy resin coating according to claim 1, characterized in that, In step S1, the mass ratio of epoxy resin E-51, terminal epoxy organosilicon oligomer, butyl acetate, and wetting and dispersing agent is 100:30-35:4-6:0.7-0.

9. The mass ratio of the fluorinated epoxy monomer microcapsules, curing agent microcapsules, premixed liquid and defoamer in step S2 is 1:0.2-0.3:20-25:0.01-0.

02.

3. The preparation process of a waterproof and oil-resistant epoxy resin coating according to claim 1, characterized in that, The preparation steps of the terminal epoxy group organosilicon oligomer in step S1 are as follows: Step A1: Under a nitrogen atmosphere, add anhydrous toluene to end-hydrogen silicone oil, heat to 80-90℃, and stir for 8-12 minutes to obtain silicone oil solution; Step A2: Under a nitrogen atmosphere, add allyl glycidyl ether to the silicone oil solution, heat to 85-95℃, stir for 6-8 min, add platinum catalyst, stir for 8-12 min until the reaction is complete, obtain the reaction solution, cool to 20-30℃, reduce the pressure to -0.08MPa to -0.09MPa, distill under reduced pressure, filter, heat to 100-120℃, stir for 1-2 h to obtain the terminal epoxy organosilicon oligomer.

4. The preparation process of a waterproof and oil-resistant epoxy resin coating according to claim 3, characterized in that, The mass ratio of the hydrogen-containing silicone oil to anhydrous toluene mentioned in step A1 is 1:0.3-0.5; The mass ratio of the silicone oil solution to allyl glycidyl ether in step A2 is 1:0.14-0.

2.

5. The preparation process of a waterproof and oil-resistant epoxy resin coating according to claim 1, characterized in that, The preparation steps of the fluorinated epoxy monomer microcapsules in step S2 are as follows: Perfluorooctyl ethyl glycidyl ether, toluene-2,4-diisocyanate, and lauryl alcohol polyoxyethylene ether were added to cyclohexane and stirred for 8-12 min. Ethylenediamine was then added and stirred for 20-30 min. The mixture was filtered and dried to obtain fluorinated epoxy monomer microcapsules. The mass ratio of perfluorooctyl ethyl glycidyl ether, toluene-2,4-diisocyanate, lauryl polyoxyethylene ether, cyclohexane and ethylenediamine is 1:0.5-0.7:0.06-0.1:8-12:0.5-0.

8.

6. The preparation process of a waterproof and oil-resistant epoxy resin coating according to claim 1, characterized in that, The preparation steps of the curing agent microcapsules in step S2 are as follows: Step B1: Add gelatin to deionized water, heat to 50-55℃, and stir for 20-30 minutes to obtain a gelatin solution. Step B2: Add gum arabic to deionized water, heat to 50-55℃, stir for 20-30 minutes to obtain gum arabic solution; Step B3: Add the gum arabic solution to the gelatin solution, heat to 50-55℃, stir for 10-20 min, add 1 wt% acetic acid solution to adjust the pH to 4.0-4.5, add 2-ethyl-4-methylimidazole, stir for 10-12 min, add deionized water, stir for 20-40 min, cool to 20-30℃, add 10 wt% sodium hydroxide aqueous solution, adjust the pH to 9.0-9.5, add the crosslinking agent glutaraldehyde, stir for 10-12 min, filter, and dry to obtain curing agent microcapsules.

7. The preparation process of a waterproof and oil-resistant epoxy resin coating according to claim 6, characterized in that, The mass ratio of gelatin to deionized water in step B1 is 1:30-36; The mass ratio of gum arabic to deionized water in step B2 is 1:28-34; The mass ratio of the gelatin solution, gum arabic solution, 2-ethyl-4-methylimidazole and deionized water in step B3 is 1:1-1.2:0.02-0.03:68-72.

8. A process for preparing a waterproof and oil-resistant coating, using the waterproof and oil-resistant epoxy resin coating as described in any one of claims 1-7, characterized in that, Includes the following steps: Add polyetheramine D-230 and the catalyst dibutyltin dilaurate to the waterproof and oil-proof epoxy resin coating, stir for 6-8 minutes, apply to the substrate, heat to 75-80℃, cure for 20-40 minutes, heat to 115-125℃, and cure for 1.5-2.5 hours to obtain a waterproof and oil-proof coating.

9. The preparation process of a waterproof and oil-resistant coating according to claim 8, characterized in that, The mass ratio of the polyetheramine D-230 to the waterproof and oil-resistant epoxy resin coating is 1:3.8-4.2.

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