A method for preparing high-performance waterborne epoxy coating

Abstract

The invention relates to the technical field of coatings, and discloses a method for preparing a high-performance waterborne epoxy coating. The invention uses phosphatidyl triethanol, epichlorohydrin, diethanolamine, etc. as raw materials, and reacts to prepare a phosphorus-containing polyol intermediate. Toluene diisocyanate is used twice to react with amino-modified nano-silica and glycidol respectively to prepare isocyanate-modified nano-silica and epoxy-containing isocyanate intermediates. Under the catalytic reaction of dibutyltin dilaurate, the phosphorus-containing polyol intermediate reacts with isocyanate-modified nano-silica and epoxy-containing isocyanate intermediates to obtain modified polyester. Finally, epoxy resin, modified polyester, etc. are added to deionized water, stirred and dispersed to obtain a high-performance waterborne epoxy coating. The high-performance waterborne epoxy coating prepared by the invention has excellent mechanical properties and flame retardant properties.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a method for preparing a high-performance waterborne epoxy coating. Background Art

[0002] Water-based paint uses water as a dispersion medium and diluent, which can effectively reduce the volatilization of organic compounds. It is an environmentally friendly paint, so it has a high usage rate and is gradually replacing solvent-based paint. Water-based paint is mainly divided into water-based epoxy resin type, water-based polyurethane type, and water-based acrylic resin type according to the base material. As a major category of water-based paint, water-based epoxy paint has the characteristics of high adhesion and excellent anti-corrosion performance. Therefore, it has many applications in many fields.

[0003] Epoxy resin generally refers to a molecule containing two or more epoxy groups, which has excellent bonding properties, wear resistance, electrical insulation properties and other properties. However, after curing, pure epoxy resin has a three-dimensional network structure, high cross-linking density, high cohesion, and is brittle, so its impact resistance is poor. In addition, epoxy resin has poor flame retardant properties, which greatly limits its application in certain harsh environments.

[0004] For example, the patent with authorization announcement number CN 106189716 B uses epoxy resin, nitrogen-phosphorus composite flame retardant and the like as raw materials to prepare a water-based flame-retardant epoxy resin coating having good flame retardant properties, impact resistance and other properties. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies of the prior art, the present invention provides a method for preparing a high-performance waterborne epoxy coating, and the prepared waterborne epoxy coating has excellent flame retardant properties and mechanical properties.

[0007] (II) Technical solution

[0008] A method for preparing a high-performance waterborne epoxy coating, the preparation method comprising:

[0009] (1) Under nitrogen conditions, phosphatidyl triethanol and boron trifluoride ether complex are added to toluene solvent, and etherification is carried out at 60-75° C. for 3-5 hours. After the reaction is completed, epichlorohydrin is added thereto and reacted for 3-5 hours. After the reaction is completed, the temperature is lowered to 20-30° C., and sodium hydroxide is added thereto and the reaction is continued for 2-5 hours. After the reaction is completed, the mixture is filtered, washed with deionized water, and dried to obtain intermediate 1, such as Figure 1 .

[0010] (2) Under nitrogen conditions, the intermediate 1 and diethanolamine are added to a toluene solvent, stirred and dispersed, and the temperature is raised to 70-80° C. for reaction for 6-24 hours. After the reaction is completed, the intermediate is distilled under reduced pressure, washed with deionized water, and dried to obtain a phosphorus-containing polyol intermediate such as Figure 1 .

[0011] (3) Under nitrogen conditions, toluene diisocyanate is added to acetonitrile solvent, stirred and dispersed, and then amino-modified nano-silica is added thereto, and the reaction is carried out at 30-40° C. for 40-72 hours. After the reaction is completed, centrifugation is performed, the mixture is washed with acetone, and dried to obtain isocyanate-modified nano-silica.

[0012] (4) Under nitrogen conditions, toluene diisocyanate is added to an acetone solvent, stirred and dispersed, and then dibutyltin dilaurate and propylene oxide are added thereto. The temperature is controlled at 35-45° C. and the reaction is carried out for 3-6 hours. After the reaction is completed, an epoxy-containing isocyanate intermediate is obtained.

[0013] (5) adding the phosphorus-containing polyol intermediate into an acetone solvent, and then adding isocyanate-modified nano-silica, epoxy-containing isocyanate intermediate, and dibutyltin dilaurate thereto, reacting at 55-70° C. for 4-10 hours. After the reaction is completed, rotary evaporation is performed to obtain a modified polyester.

[0014] (6) Add epoxy resin and modified polyester into deionized water, stir and disperse, then add curing agent, defoaming agent and dispersant, stir and disperse, and obtain high-performance waterborne epoxy coating.

[0015] Preferably, in step (1), the mass ratio of phosphatidyl triethanolamine, epichlorohydrin and sodium hydroxide is 100:220-260:90-120, and the amount of boron trifluoride ether complex is 0.3-0.6% of the total mass of phosphatidyl triethanolamine and epichlorohydrin.

[0016] Preferably, in step (2), the mass ratio of intermediate 1 to diethanolamine is 100:100-150.

[0017] Preferably, in step (3), the mass ratio of toluene diisocyanate to amino-modified nano-silica is 100:80-120.

[0018] Preferably, in step (4), the mass ratio of toluene diisocyanate, dibutyltin dilaurate and glycidol is 100:0.2-0.4:40-60.

[0019] Preferably, in step (5), the mass ratio of the phosphorus-containing polyol intermediate, the isocyanate-modified nano-silica, the epoxy-containing isocyanate intermediate, and dibutyltin dilaurate is 100:60-400:30-240:0.004-0.008.

[0020] Preferably, in step (6), the mass ratio of epoxy resin, modified polyester, deionized water, curing agent, defoaming agent and dispersant is 100:20-60:40-60:12-20:0.1-0.5:1-4.

[0021] (III) Beneficial technical effects

[0022] The present invention uses phosphatidyl triethanol, epichlorohydrin, diethanolamine and the like as raw materials, and through reaction, a phosphorus-containing polyol intermediate is prepared. Toluene diisocyanate is used twice to react with amino-modified nano-silica and glycidol respectively, to prepare isocyanate-modified nano-silica and epoxy-containing isocyanate intermediates. Under the catalytic reaction of dibutyltin dilaurate, the phosphorus-containing polyol intermediate reacts with isocyanate-modified nano-silica and epoxy-containing isocyanate intermediates to obtain modified polyester. Finally, epoxy resin, modified polyester and the like are added to deionized water, stirred and dispersed, and high-performance water-based epoxy coatings are obtained. The modified polyester prepared by the present invention has a simple preparation method and a novel structure, and the epoxy groups contained therein have good compatibility with the epoxy resin.

[0023] The high-performance waterborne epoxy coating prepared by the present invention contains nano-silicon dioxide particles. After the waterborne epoxy coating is cured, when it is subjected to external impact, the uniformly dispersed nano-silicon dioxide particles therein act as stress concentration points and can absorb more stress, thereby improving the mechanical properties of the material. In addition, the modified polyester prepared by the present invention contains alkyl long chains. When it is subjected to impact, the impact force is dispersed along the alkyl long chains to other long chains, thereby further improving the mechanical properties of the coating.

[0024] In addition, the waterborne epoxy coating prepared by the present invention contains phosphorus and nitrogen, wherein the phosphorus generates strong dehydrating substances such as phosphoric acid and metaphosphoric acid when heated, promotes the dehydration of the material into carbon, forms a carbon layer on the surface of the material, and hinders the transportation of materials and energy transfer. The nitrogen contained therein generates a flame-retardant gas when heated, dilutes the concentration of flammable gas in the air, and further improves the flame retardant properties of the material. The high-performance waterborne epoxy coating prepared by the present invention has excellent mechanical properties and flame retardant properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a preparation route for phosphorus-containing polyol intermediates. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] Preparation method of amino-modified nano-silica: add 10 mL of 25% ammonia water to 200 mL of ethanol solvent, then add 10 mL of ethyl orthosilicate and 1.8 mL of 3-aminopropyltriethoxysilane, heat to 40°C, stir for 6 hours, then heat to 80°C, reflux for 3 hours, after the reaction is completed, centrifuge, wash with ethanol, and dry to obtain amino-modified nano-silica.

[0028] The epoxy resin is epoxy resin 4253, the curing agent is curing agent 3951, the defoaming agent is defoaming agent SN-6791, and the dispersant is dispersing agent SN-1728.

[0029] Example 1

[0030] (1) Under nitrogen conditions, 5 g of phosphatidyl triethanol and 0.1 g of boron trifluoride ether complex were added to 150 mL of toluene solvent and etherified at 65° C. for 4 h. After the reaction, 13 g of epichlorohydrin was added thereto and reacted for 3 h. After the reaction, the temperature was lowered to 30° C., and 5 g of sodium hydroxide was added thereto and the reaction was continued for 2 h. After the reaction, the mixture was filtered, washed with deionized water, and dried to obtain intermediate 1.

[0031] (2) Under nitrogen conditions, 10 g of intermediate 1 and 14 g of diethanolamine were added to 150 mL of toluene solvent, stirred and dispersed, heated to 75° C., and reacted for 20 h. After the reaction was completed, the mixture was distilled under reduced pressure, washed with deionized water, and dried to obtain a phosphorus-containing polyol intermediate.

[0032] (3) Under nitrogen conditions, 10 g of toluene diisocyanate was added to 100 mL of acetonitrile solvent, stirred and dispersed, and then 9 g of amino-modified nano-silica was added thereto. The reaction was carried out at 35° C. for 68 h. After the reaction was completed, the mixture was centrifuged, washed with acetone, and dried to obtain isocyanate-modified nano-silica.

[0033] (4) Under nitrogen conditions, 20 g of toluene diisocyanate was added to 100 mL of acetone solvent and stirred for dispersion. Then, 0.005 g of dibutyltin dilaurate and 8 g of propylene oxide were added thereto. The temperature was controlled at 35 ° C. and the reaction was carried out for 5 h. After the reaction was completed, an epoxy-containing isocyanate intermediate was obtained.

[0034] (5) 20 g of the phosphorus-containing polyol intermediate was added to 200 mL of acetone solvent, and then 12 g of isocyanate-modified nano-silica, 48 g of epoxy-containing isocyanate intermediate, and 0.0008 g of dibutyltin dilaurate were added thereto. The mixture was reacted at 70° C. for 10 h. After the reaction was completed, the mixture was rotary evaporated to obtain a modified polyester.

[0035] (6) 40 g of epoxy resin and 8 g of modified polyester were added to 18 g of deionized water, stirred and dispersed, and then 7 g of curing agent, 0.15 g of defoaming agent and 1.5 g of dispersant were added thereto, stirred and dispersed to obtain a high-performance water-based epoxy coating.

[0036] Example 2

[0037] (1) Under nitrogen conditions, 5 g of phosphatidyl triethanol and 0.048 g of boron trifluoride ether complex were added to 150 mL of toluene solvent and etherified at 75° C. for 5 h. After the reaction, 11 g of epichlorohydrin was added thereto and reacted for 5 h. After the reaction, the temperature was lowered to 30° C., and 6 g of sodium hydroxide was added thereto and the reaction was continued for 4 h. After the reaction, the mixture was filtered, washed with deionized water, and dried to obtain intermediate 1.

[0038] (2) Under nitrogen conditions, 10 g of intermediate 1 and 14 g of diethanolamine were added to 150 mL of toluene solvent, stirred and dispersed, heated to 75° C., and reacted for 12 h. After the reaction was completed, the mixture was distilled under reduced pressure, washed with deionized water, and dried to obtain a phosphorus-containing polyol intermediate.

[0039] (3) Under nitrogen conditions, 10 g of toluene diisocyanate was added to 100 mL of acetonitrile solvent, stirred and dispersed, and then 9 g of amino-modified nano-silica was added thereto. The reaction was carried out at 35° C. for 60 h. After the reaction was completed, the mixture was centrifuged, washed with acetone, and dried to obtain isocyanate-modified nano-silica.

[0040] (4) Under nitrogen conditions, 20 g of toluene diisocyanate was added to 100 mL of acetone solvent, and the mixture was dispersed by stirring. Then, 0.08 g of dibutyltin dilaurate and 12 g of propylene oxide were added thereto. The temperature was controlled at 45 ° C. and the reaction was carried out for 3 h. After the reaction was completed, an epoxy-containing isocyanate intermediate was obtained.

[0041] (5) 20 g of the phosphorus-containing polyol intermediate was added to 200 mL of acetone solvent, and then 20 g of isocyanate-modified nano-silica, 40 g of epoxy-containing isocyanate intermediate, and 0.0016 g of dibutyltin dilaurate were added thereto. The mixture was reacted at 60° C. for 5 h. After the reaction was completed, the mixture was rotary evaporated to obtain a modified polyester.

[0042] (6) 40 g of epoxy resin and 12 g of modified polyester were added to 22 g of deionized water, stirred and dispersed, and then 6 g of curing agent, 0.1 g of defoaming agent and 1.2 g of dispersant were added thereto, stirred and dispersed to obtain a high-performance water-based epoxy coating.

[0043] Example 3

[0044] (1) Under nitrogen conditions, 5 g of phosphatidyl triethanol and 0.05 g of boron trifluoride ether complex were added to 150 mL of toluene solvent and etherified at 60° C. for 3 h. After the reaction was completed, 12 g of epichlorohydrin was added thereto and reacted for 5 h. After the reaction was completed, the temperature was lowered to 20° C., and 4.5 g of sodium hydroxide was added thereto and the reaction was continued for 5 h. After the reaction was completed, the mixture was filtered, washed with deionized water, and dried to obtain intermediate 1.

[0045] (2) Under nitrogen conditions, 10 g of intermediate 1 and 10 g of diethanolamine were added to 150 mL of toluene solvent, stirred and dispersed, heated to 75° C., and reacted for 12 h. After the reaction was completed, the mixture was distilled under reduced pressure, washed with deionized water, and dried to obtain a phosphorus-containing polyol intermediate.

[0046] (3) Under nitrogen conditions, 10 g of toluene diisocyanate was added to 100 mL of acetonitrile solvent, stirred and dispersed, and then 10 g of amino-modified nano-silica was added thereto. The reaction was carried out at 35° C. for 72 h. After the reaction was completed, the mixture was centrifuged, washed with acetone, and dried to obtain isocyanate-modified nano-silica.

[0047] (4) Under nitrogen conditions, 20 g of toluene diisocyanate was added to 100 mL of acetone solvent, and the mixture was dispersed by stirring. Then, 0.004 g of dibutyltin dilaurate and 10 g of propylene oxide were added thereto. The temperature was controlled at 40° C. and the reaction was carried out for 6 h. After the reaction was completed, an epoxy-containing isocyanate intermediate was obtained.

[0048] (5) 20 g of the phosphorus-containing polyol intermediate was added to 200 mL of acetone solvent, and then 40 g of isocyanate-modified nano-silica, 30 g of epoxy-containing isocyanate intermediate, and 0.001 g of dibutyltin dilaurate were added thereto. The mixture was reacted at 55° C. for 4 h. After the reaction was completed, the mixture was rotary evaporated to obtain a modified polyester.

[0049] (6) 40 g of epoxy resin and 16 g of modified polyester were added to 24 g of deionized water, stirred and dispersed, and then 8 g of curing agent, 0.2 g of defoaming agent, and 0.5 g of dispersant were added thereto, stirred and dispersed to obtain a high-performance water-based epoxy coating.

[0050] Example 4

[0051] (1) Under nitrogen conditions, 5 g of phosphatidyl triethanol and 0.06 g of boron trifluoride ether complex were added to 150 mL of toluene solvent and etherified at 65° C. for 4 h. After the reaction, 12 g of epichlorohydrin was added thereto and reacted for 4 h. After the reaction, the temperature was lowered to 25° C., and 5 g of sodium hydroxide was added thereto and the reaction was continued for 4 h. After the reaction, the mixture was filtered, washed with deionized water, and dried to obtain intermediate 1.

[0052] (2) Under nitrogen conditions, 10 g of intermediate 1 and 15 g of diethanolamine were added to 150 mL of toluene solvent, stirred and dispersed, heated to 80° C., and reacted for 24 h. After the reaction was completed, the mixture was distilled under reduced pressure, washed with deionized water, and dried to obtain a phosphorus-containing polyol intermediate.

[0053] (3) Under nitrogen conditions, 10 g of toluene diisocyanate was added to 100 mL of acetonitrile solvent, stirred and dispersed, and then 8 g of amino-modified nano-silica was added thereto. The reaction was carried out at 30° C. for 40 h. After the reaction was completed, the mixture was centrifuged, washed with acetone, and dried to obtain isocyanate-modified nano-silica.

[0054] (4) Under nitrogen conditions, 20 g of toluene diisocyanate was added to 100 mL of acetone solvent, and the mixture was dispersed by stirring. Then, 0.05 g of dibutyltin dilaurate and 9 g of propylene oxide were added thereto. The temperature was controlled at 40° C. and the reaction was carried out for 6 h. After the reaction was completed, an epoxy-containing isocyanate intermediate was obtained.

[0055] (5) 20 g of the phosphorus-containing polyol intermediate was added to 200 mL of acetone solvent, and then 60 g of isocyanate-modified nano-silica, 15 g of epoxy-containing isocyanate intermediate, and 0.0012 g of dibutyltin dilaurate were added thereto. The mixture was reacted at 60 ° C. for 8 h. After the reaction was completed, the mixture was rotary evaporated to obtain a modified polyester.

[0056] (6) 40 g of epoxy resin and 20 g of modified polyester were added to 16 g of deionized water, stirred and dispersed, and then 4.8 g of curing agent, 0.04 g of defoaming agent and 0.4 g of dispersant were added thereto, stirred and dispersed to obtain a high-performance water-based epoxy coating.

[0057] Example 5

[0058] (1) Under nitrogen conditions, 5 g of phosphatidyl triethanol and 0.06 g of boron trifluoride ether complex were added to 150 mL of toluene solvent and etherified at 65° C. for 4 h. After the reaction, 12 g of epichlorohydrin was added thereto and reacted for 4 h. After the reaction, the temperature was lowered to 25° C., and 5.5 g of sodium hydroxide was added thereto and the reaction was continued for 3 h. After the reaction, the mixture was filtered, washed with deionized water, and dried to obtain intermediate 1.

[0059] (2) Under nitrogen conditions, 10 g of intermediate 1 and 13 g of diethanolamine were added to 150 mL of toluene solvent, stirred and dispersed, heated to 70° C., and reacted for 6 h. After the reaction was completed, the mixture was distilled under reduced pressure, washed with deionized water, and dried to obtain a phosphorus-containing polyol intermediate.

[0060] (3) Under nitrogen conditions, 10 g of toluene diisocyanate was added to 100 mL of acetonitrile solvent, stirred and dispersed, and then 12 g of amino-modified nano-silica was added thereto. The reaction was carried out at 40° C. for 48 h. After the reaction was completed, the mixture was centrifuged, washed with acetone, and dried to obtain isocyanate-modified nano-silica.

[0061] (4) Under nitrogen conditions, 20 g of toluene diisocyanate was added to 100 mL of acetone solvent, and the mixture was dispersed by stirring. Then, 0.05 g of dibutyltin dilaurate and 10 g of propylene oxide were added thereto. The temperature was controlled at 40° C. and the reaction was carried out for 5 h. After the reaction was completed, an epoxy-containing isocyanate intermediate was obtained.

[0062] (5) 20 g of the phosphorus-containing polyol intermediate was added to 200 mL of acetone solvent, and then 80 g of isocyanate-modified nano-silica, 6 g of epoxy-containing isocyanate intermediate, and 0.00012 g of dibutyltin dilaurate were added thereto. The mixture was reacted at 60 ° C. for 8 h. After the reaction was completed, the mixture was rotary evaporated to obtain a modified polyester.

[0063] (6) 40 g of epoxy resin and 24 g of modified polyester were added to 20 g of deionized water, stirred and dispersed, and then 7 g of curing agent, 0.1 g of defoaming agent and 1.6 g of dispersant were added thereto, stirred and dispersed to obtain a high-performance water-based epoxy coating.

[0064] Comparative Example 1

[0065] The difference between this comparative example and Example 1 is that in step (6), no modified polyester is contained.

[0066] The 120mm×50mm×0.28mm tinplate was polished with sandpaper, washed with acetone and deionized water in turn, and dried. The mixed epoxy coating was coated on the treated tinplate using a wire rod coater, and the coating thickness was controlled to be 120μm. It was cured in a vacuum oven for 3h and left at room temperature for 2 days to prepare a water-based epoxy coating.

[0067] Use the paint film impact tester to test the impact resistance of the coating.

[0068] Use a pencil hardness tester to test the pencil hardness of the coating.

[0069] Use an adhesion tester to test the adhesion of the coating.

[0070] Table 1: Mechanical properties test results of various embodiments and comparative examples

[0071] Impact resistance / cm Hardness / H Adhesion / MPa Example 1 45 2 8.49 Example 2 48 2 9.16 Example 3 50 3 11.07 Example 4 60 3 12.10 Example 5 50 3 10.98 Comparative Example 1 40 1 6.65

[0072] It can be seen from the table that the mechanical properties of Examples 1-5 are better than those of Comparative Example 1. Therefore, the waterborne epoxy coating prepared by the present invention has better mechanical properties.

[0073] Use horizontal and vertical combustion tester and oxygen index meter to measure the flame retardant properties of materials.

[0074] Table 2: Flame retardant performance test results of various embodiments and comparative examples

[0075] UL-94 LOI / % Example 1 25.4 V-1 Example 2 27.9 V-1 Example 3 29.1 V-0 Example 4 31.4 V-0 Example 5 31.9 V-0 Comparative Example 1 19.8 No rating

[0076] It can be seen from the table that the flame retardant properties of Examples 1-5 are better than that of Comparative Example 1. Therefore, the waterborne epoxy coating prepared by the present invention has good flame retardant properties.

[0077] The above description of the embodiments is to facilitate the understanding and application of the present invention by those skilled in the art. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the embodiments herein, and modifications made to the present invention by those skilled in the art based on the disclosure of the present invention should be within the scope of protection of the present invention.

Claims

1. A method for preparing a high-performance waterborne epoxy coating, characterized in that: The preparation method is: (1) Under nitrogen conditions, tri(hydroxymethyl)phosphine and boron trifluoride ether complex are added to a toluene solvent, and etherification is carried out at 60-75° C. for 3-5 hours. After the reaction is completed, epichlorohydrin is added thereto and reacted for 3-5 hours. After the reaction is completed, the temperature is lowered to 20-30° C., and sodium hydroxide is added thereto and the reaction is continued for 2-5 hours. After the reaction is completed, the mixture is filtered, washed with deionized water, and dried to obtain an intermediate 1; (2) Under nitrogen conditions, the intermediate 1 and diethanolamine are added to a toluene solvent, stirred and dispersed, heated to 70-80° C., reacted for 6-24 hours, and after the reaction is completed, vacuum distilled, washed with deionized water, and dried to obtain a phosphorus-containing polyol intermediate; (3) under nitrogen conditions, toluene diisocyanate is added to acetonitrile solvent, stirred and dispersed, and then amino-modified nano-silica is added thereto, reacted at 30-40° C. for 40-72 hours, and after the reaction is completed, centrifuged, washed with acetone, and dried to obtain isocyanate-modified nano-silica; (4) under nitrogen conditions, toluene diisocyanate is added to an acetone solvent, stirred and dispersed, and then dibutyltin dilaurate and glycidol are added thereto, the temperature is controlled at 35-45° C., and the reaction is carried out for 3-6 hours. After the reaction is completed, an epoxy-containing isocyanate intermediate is obtained; (5) adding the phosphorus-containing polyol intermediate to an acetone solvent, and then adding isocyanate-modified nano-silica, epoxy-containing isocyanate intermediate, and dibutyltin dilaurate thereto, reacting at 55-70° C. for 4-10 hours, and after the reaction is completed, rotary evaporation to obtain a modified polyurethane; (6) Add epoxy resin and modified polyurethane to deionized water, stir and disperse, then add curing agent, defoaming agent and dispersant, stir and disperse, and obtain high-performance water-based epoxy coating.

2. The method for preparing a high performance waterborne epoxy coating according to claim 1, characterized in that: In the step (1), the mass ratio of tri(hydroxymethyl)phosphine, epichlorohydrin and sodium hydroxide is 100:220-260:90-120.

3. The method for preparing a high performance waterborne epoxy coating according to claim 1, characterized in that: In the step (1), the amount of boron trifluoride ether complex used is 0.3-0.6% of the total mass of tri(hydroxymethyl)phosphine and epichlorohydrin.

4. The method for preparing a high-performance waterborne epoxy coating according to claim 1, characterized in that: In the step (2), the mass ratio of the intermediate 1 to diethanolamine is 100:100-150.

5. The method for preparing a high performance waterborne epoxy coating according to claim 1, characterized in that: In the step (3), the mass ratio of toluene diisocyanate to amino-modified nano-silica is 100:80-120.

6. The method for preparing a high performance waterborne epoxy coating according to claim 1, characterized in that: In the step (4), the mass ratio of toluene diisocyanate, dibutyltin dilaurate and glycidol is 100:0.2-0.4:40-60.

7. The method for preparing a high performance waterborne epoxy coating according to claim 1, characterized in that: In the step (5), the mass ratio of the phosphorus-containing polyol intermediate, the isocyanate-modified nano-silica, the epoxy-containing isocyanate intermediate, and the dibutyltin dilaurate is 100:60-400:30-240:0.004-0.

008.

8. The method for preparing a high performance waterborne epoxy coating according to claim 1, characterized in that: In the step (6), the mass ratio of epoxy resin, modified polyurethane, deionized water, curing agent, defoaming agent and dispersant is 100:20-60:40-60:12-20:0.1-0.5:1-4.

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