An anticorrosive coating containing graphitized carbon-coated zinc powder and a preparation method thereof

Abstract

This invention discloses an anti-corrosion coating containing graphitized carbon-coated zinc powder and its preparation method. The anti-corrosion coating containing graphitized carbon-coated zinc powder comprises the following raw materials in parts by weight: 60-70 parts epoxy resin, 14-18 parts graphitized carbon-coated zinc powder, 6-8 parts functionalized magnesium hydroxide, 5-6 parts phosphorus-silicon flame-retardant curing agent, 3-4 parts diethylenetriamine, 7-9 parts glycidyl butyl ether, and 10-14 parts acetone. The graphitized carbon-coated zinc powder is obtained by coating zinc powder surface with polyvinylpyrrolidone as a carbon source and then carbonizing at high temperature; the functionalized magnesium hydroxide is obtained by reacting magnesium hydroxide surface-treated with KH550 with oxybenzone; the phosphorus-silicon flame-retardant curing agent is obtained by reacting tetramethyldivinyldisiloxane and diethyl phosphite, followed by reaction with 1,3-propanediamine. These improvements endow the coating with excellent anti-corrosion, flame-retardant, and weather-resistant properties.

Description

Technical Field

[0001] This invention relates to the field of anti-corrosion coating technology, specifically to an anti-corrosion coating containing graphitized carbon-coated zinc powder and its preparation method. Background Technology

[0002] Due to their unique physical and chemical properties, metallic materials are widely used in all aspects of people's production and life, playing a crucial role in modern industrial production and daily life. During actual use, corrosive media such as water, oxygen, and chloride ions in the environment can react slowly with the metal through chemical or electrochemical reactions, causing corrosion and resulting in the metal losing its original performance characteristics.

[0003] Coatings are a simple and cost-effective way to protect metal materials from corrosion. Among them, epoxy coatings, in particular, have outstanding advantages such as low cost, good electrical insulation properties, strong adhesion to metal substrates, and excellent application ease, making them widely used protective coatings.

[0004] Zinc powder is a common pigment with excellent rust and corrosion resistance, often combined with epoxy coatings. To achieve better corrosion protection and extend the service life of anti-corrosion coatings, a sufficiently high zinc powder loading is required in the epoxy coating. However, excessive zinc powder loading in the coating can easily lead to porosity defects, causing cracking and poor adhesion. Furthermore, during service, zinc powder generates significant amounts of zinc salts during the cathodic protection stage, weakening the coating's adhesion. Maintaining good anti-corrosion performance while reducing zinc powder usage is a pressing issue. Additionally, epoxy coatings are flammable and prone to yellowing and chalking when exposed to outdoor environments for extended periods. Summary of the Invention

[0005] The purpose of this invention is to provide an anti-corrosion coating containing graphitized carbon-coated zinc powder and its preparation method, so as to solve the problems existing in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] An anti-corrosion coating containing graphitized carbon-coated zinc powder, by weight, mainly comprises: 60-70 parts epoxy resin, 14-18 parts graphitized carbon-coated zinc powder, 6-8 parts functionalized magnesium hydroxide, 5-6 parts phosphorus-silicon flame retardant curing agent, 3-4 parts diethylenetriamine, 7-9 parts glycidyl butyl ether, and 10-14 parts acetone.

[0008] Preferably, the graphitized carbon-coated zinc powder is obtained by coating the zinc powder surface with polyvinylpyrrolidone as a carbon source and then carbonizing it at high temperature.

[0009] Preferably, the functionalized magnesium hydroxide is obtained by reacting surface-treated magnesium hydroxide with oxybenzone;

[0010] The surface-treated magnesium hydroxide is obtained by reacting magnesium hydroxide and KH550 silane coupling agent.

[0011] Preferably, the phosphorus-silicon flame retardant curing agent is prepared by reacting a phosphorus-silicon flame retardant with 1,3-propanediamine;

[0012] The phosphorus-silicon flame retardant is prepared by reacting tetramethyldivinyldisiloxane and diethyl phosphite.

[0013] A method for preparing an anti-corrosion coating containing graphitized carbon-coated zinc powder includes the following preparation steps:

[0014] Step 1: Wash the zinc powder sequentially with acetone and 70wt% ethanol aqueous solution 3-5 times, and dry at 70-80℃; mix polyvinylpyrrolidone and anhydrous ethanol at a mass ratio of 1:(26-32), stir at room temperature for 10-20 min to obtain a polyvinylpyrrolidone solution; mix the washed and dried zinc powder with the polyvinylpyrrolidone solution at a mass ratio of 1:(5-6), dry at 70-80℃ to obtain pretreated zinc powder; place the pretreated zinc powder in a tube furnace, calcine at high temperature under argon protection at a temperature of 400-410℃ for 4-5 h, and cool to room temperature to obtain graphitized carbon-coated zinc powder;

[0015] Step 2: Dissolve tetramethyldivinyldisiloxane and diethyl phosphite in a molar ratio of 1:(2.1~2.3) in toluene at 10~12 times the mass of tetramethyldivinyldisiloxane. Add azobisisobutyronitrile at 0.01~0.02 times the mass of tetramethyldivinyldisiloxane. React at 70~80℃ for 8~10h, rotary evaporate under reduced pressure, wash with ethanol, and dry under vacuum at 60~70℃ to obtain the phosphorus-silicon flame retardant; the molar ratio is... 1: (7~8) Weigh out the phosphorus-silicon flame retardant and 1,3-propanediamine; under nitrogen protection, mix 1,3-propanediamine and N,N-dimethylformamide in a mass ratio of 1: (14~18), heat to 100℃, add the phosphorus-silicon flame retardant in 4 portions over 1 hour, and after the addition is complete, heat to 136~140℃ and reflux for 7~8 hours. Then, evaporate under reduced pressure, wash with ethanol, and dry under vacuum at 60~70℃ to obtain the phosphorus-silicon flame retardant curing agent.

[0016] Step 3: Mix surface-treated magnesium hydroxide, oxybenzone, and N,N-dimethylformamide in a mass ratio of 1:(0.3~0.4):(20~30), sonicate for 30~40 min, heat to 90~100℃ and stir for 1~2 h, add 5~6 times the mass of oxybenzone in acetic acid, continue stirring and react for 2~3 h, filter, wash with anhydrous ethanol, and vacuum dry at 50~60℃ to constant weight to obtain functionalized magnesium hydroxide;

[0017] Step 4: Mix epoxy resin, graphitized carbon-coated zinc powder, functionalized magnesium hydroxide, glycidyl butyl ether, and acetone evenly, stir at room temperature for 10-20 minutes, add phosphorus-silicon flame retardant curing agent and diethylenetriamine, continue stirring for 3-5 minutes, and degas under vacuum to obtain an anti-corrosion coating containing graphitized carbon-coated zinc powder.

[0018] Preferably, the zinc powder in step 1 is spherical zinc powder with a mesh size of 500.

[0019] Preferably, the polyvinylpyrrolidone in step 1 is PVPK30, industrial grade, with an active ingredient content of 98%.

[0020] Preferably, the chemical formula for the reaction of the phosphorus-silicon flame retardant in step 2 is as follows:

[0021] .

[0022] Preferably, the preparation process of the surface-treated magnesium hydroxide in step 3 is as follows: magnesium hydroxide, anhydrous ethanol, and deionized water are mixed in a mass ratio of 1:(34~40):(10~14), ultrasonicated for 20~30 min, 0.06~0.08 times the mass of magnesium hydroxide is added as KH550 silane coupling agent, ultrasonically dispersed for 1~2 h, heated to 70~80℃ and stirred for 3~4 h under nitrogen protection, filtered, washed with anhydrous ethanol and deionized water, and vacuum dried at 50~60℃ for 10~14 h to obtain surface-treated magnesium hydroxide.

[0023] Preferably, the magnesium hydroxide is industrial grade, with a content of 99% and a density of 2.36 g / cm³, and is manufactured by Jinan Hengyuan Chemical Co., Ltd.

[0024] Preferably, the amounts of epoxy resin, graphitized carbon-coated zinc powder, functionalized magnesium hydroxide, phosphorus-silicon flame retardant curing agent, diethylenetriamine, glycidyl butyl ether, and acetone used in step 4 are as follows: by weight, epoxy resin 60-70 parts, graphitized carbon-coated zinc powder 14-18 parts, functionalized magnesium hydroxide 6-8 parts, phosphorus-silicon flame retardant curing agent 5-6 parts, diethylenetriamine 3-4 parts, glycidyl butyl ether 7-9 parts, and acetone 10-14 parts.

[0025] Preferably, the epoxy resin is E-51.

[0026] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0027] First, polyvinylpyrrolidone is used as a carbon source to coat the surface of zinc powder, and high-temperature carbonization is used to obtain graphitized carbon-coated zinc powder. The zinc powder mainly achieves its anti-corrosion performance through the dual mechanisms of cathodic protection and shielding protection of sacrificial anode. By coating the surface of zinc powder with a layer of graphitized carbon, graphitized carbon, as a conductive material, can better build a conductive circuit between zinc powder particles to form a protective layer, reducing the amount of zinc powder used. At the same time, the graphitized carbon layer forms a dense coating structure on the surface of zinc powder, which can effectively reduce the direct contact of corrosive media (such as water, oxygen, and chloride ions) with zinc powder, delay its premature oxidation, and thus extend the duration of cathodic protection.

[0028] Second, a phosphorus-silicon flame retardant is prepared by reacting tetramethyldivinyldisiloxane and diethyl phosphite with phosphorus hydroaddition. Then, the phosphate ester bond on the phosphorus-silicon flame retardant undergoes an amino-ester exchange reaction with excess 1,3-propanediamine to introduce an amino group and prepare a phosphorus-silicon flame retardant curing agent. The amino group on the phosphorus-silicon flame retardant curing agent can participate in the curing and crosslinking of epoxy coatings as a curing agent. The phosphorus-silicon flame retardant curing agent contains phosphorus, silicon, and nitrogen elements, which can synergistically retard flame and improve the flame retardant ability of anti-corrosion coatings.

[0029] Third, the inorganic flame retardant magnesium hydroxide is surface modified with KH550 silane coupling agent. Amino groups are introduced on the surface of magnesium hydroxide and then reacted with oxybenzone to load benzophenone-based ultraviolet absorbers onto magnesium hydroxide in the form of chemical bonds. This not only improves the weather resistance and flame retardancy of the anti-corrosion coating, but also prevents the loss of small-molecule ultraviolet absorbers, thus achieving the purpose of long-term protection. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1

[0032] A method for preparing an anti-corrosion coating containing graphitized carbon-coated zinc powder, the method comprising the following preparation steps:

[0033] Step 1: Zinc powder was washed three times with acetone and 70wt% ethanol aqueous solution, and dried at 70℃. Polyvinylpyrrolidone and anhydrous ethanol were mixed at a mass ratio of 1:26 and stirred at room temperature for 10 min to obtain a polyvinylpyrrolidone solution. The washed and dried zinc powder was mixed with the polyvinylpyrrolidone solution at a mass ratio of 1:5 and dried at 70℃ to obtain pretreated zinc powder. The pretreated zinc powder was placed in a tube furnace and calcined at high temperature under argon protection at 400℃ for 5 h. After cooling to room temperature, graphitized carbon-coated zinc powder was obtained.

[0034] Step 2: Tetramethyldivinyldisiloxane and diethyl phosphite were dissolved in toluene at a molar ratio of 1:2.1 in 10 times the mass of tetramethyldivinyldisiloxane. Azobisisobutyronitrile was added at a molar ratio of 0.01 times the mass of tetramethyldivinyldisiloxane. The mixture was reacted at 70°C for 10 hours, then evaporated under reduced pressure, washed with ethanol, and dried under vacuum at 60°C to obtain a phosphorus-silicon flame retardant. The phosphorus-silicon flame retardant and 1,3-propanediamine were weighed at a molar ratio of 1:7. Under nitrogen protection, 1,3-propanediamine and N,N-dimethylformamide were mixed at a mass ratio of 1:14. The mixture was heated to 100°C, and the phosphorus-silicon flame retardant was added in 4 portions over 1 hour. After the addition was complete, the mixture was heated to 136°C and refluxed for 8 hours. The mixture was then evaporated under reduced pressure, washed with ethanol, and dried under vacuum at 60°C to obtain a phosphorus-silicon flame retardant curing agent.

[0035] Step 3: Mix magnesium hydroxide, anhydrous ethanol, and deionized water in a mass ratio of 1:34:10, sonicate for 20 min, add 0.06 times the mass of magnesium hydroxide in KH550 silane coupling agent, sonicate for 1 h, heat to 70℃ and stir for 4 h under nitrogen protection, filter, wash with anhydrous ethanol and deionized water, and vacuum dry at 50℃ for 14 h to obtain surface-treated magnesium hydroxide; Mix surface-treated magnesium hydroxide, oxybenzone, and N,N-dimethylformamide in a mass ratio of 1:0.3:20, sonicate for 30 min, heat to 90℃ and stir for 2 h, add 5 times the mass of oxybenzone in acetic acid, continue stirring for 3 h, filter, wash with anhydrous ethanol, and vacuum dry at 50℃ to constant weight to obtain functionalized magnesium hydroxide;

[0036] Step 4: By weight, 60 parts epoxy resin, 14 parts graphitized carbon-coated zinc powder, 6 parts functionalized magnesium hydroxide, 5 parts phosphorus-silicon flame retardant curing agent, 3 parts diethylenetriamine, 7 parts glycidyl butyl ether, and 10 parts acetone; mix the epoxy resin, graphitized carbon-coated zinc powder, functionalized magnesium hydroxide, glycidyl butyl ether, and acetone evenly, stir at room temperature for 10 minutes, add the phosphorus-silicon flame retardant curing agent and diethylenetriamine, continue stirring for 3 minutes, and degas under vacuum to obtain an anti-corrosion coating containing graphitized carbon-coated zinc powder.

[0037] Example 2

[0038] A method for preparing an anti-corrosion coating containing graphitized carbon-coated zinc powder, the method comprising the following preparation steps:

[0039] Step 1: Zinc powder was washed four times sequentially with acetone and 70wt% ethanol aqueous solution, and dried at 75℃. Polyvinylpyrrolidone and anhydrous ethanol were mixed at a mass ratio of 1:29 and stirred at room temperature for 15 min to obtain a polyvinylpyrrolidone solution. The washed and dried zinc powder was mixed with the polyvinylpyrrolidone solution at a mass ratio of 1:5.5 and dried at 75℃ to obtain pretreated zinc powder. The pretreated zinc powder was placed in a tube furnace and calcined at high temperature under argon protection at 405℃ for 4.5 h. After cooling to room temperature, graphitized carbon-coated zinc powder was obtained.

[0040] Step 2: Tetramethyldivinyldisiloxane and diethyl phosphite were dissolved in toluene at a molar ratio of 1:2.2 in 11 times the mass of tetramethyldivinyldisiloxane. Azobisisobutyronitrile was added at a molar ratio of 0.015 times the mass of tetramethyldivinyldisiloxane. The mixture was reacted at 75°C for 9 hours, then evaporated under reduced pressure, washed with ethanol, and dried under vacuum at 65°C to obtain a phosphorus-silicon flame retardant. Phosphorus-silicon flame retardant and 1,3-propanediamine were weighed at a molar ratio of 1:7.5. Under nitrogen protection, 1,3-propanediamine and N,N-dimethylformamide were mixed at a mass ratio of 1:16. The mixture was heated to 100°C, and the phosphorus-silicon flame retardant was added in 4 portions over 1 hour. After the addition was complete, the mixture was heated to 138°C and refluxed for 7.5 hours. The mixture was then evaporated under reduced pressure, washed with ethanol, and dried under vacuum at 65°C to obtain a phosphorus-silicon flame retardant curing agent.

[0041] Step 3: Mix magnesium hydroxide, anhydrous ethanol, and deionized water in a mass ratio of 1:37:12, sonicate for 25 min, add 0.07 times the mass of magnesium hydroxide in KH550 silane coupling agent, sonicate for 1.5 h, heat to 75 °C and stir for 3.5 h under nitrogen protection, filter, wash with anhydrous ethanol and deionized water, and vacuum dry at 55 °C for 12 h to obtain surface-treated magnesium hydroxide; Mix surface-treated magnesium hydroxide, oxybenzone, and N,N-dimethylformamide in a mass ratio of 1:0.35:25, sonicate for 35 min, heat to 95 °C and stir for 1.5 h, add 5.5 times the mass of oxybenzone in acetic acid, continue stirring for 2.5 h, filter, wash with anhydrous ethanol, and vacuum dry at 55 °C to constant weight to obtain functionalized magnesium hydroxide;

[0042] Step 4: By weight, 65 parts epoxy resin, 16 parts graphitized carbon-coated zinc powder, 7 parts functionalized magnesium hydroxide, 5.5 parts phosphorus-silicon flame retardant curing agent, 3.5 parts diethylenetriamine, 8 parts glycidyl butyl ether, and 12 parts acetone; mix the epoxy resin, graphitized carbon-coated zinc powder, functionalized magnesium hydroxide, glycidyl butyl ether, and acetone evenly, stir at room temperature for 15 minutes, add the phosphorus-silicon flame retardant curing agent and diethylenetriamine, continue stirring for 4 minutes, and degas under vacuum to obtain an anti-corrosion coating containing graphitized carbon-coated zinc powder.

[0043] Example 3

[0044] A method for preparing an anti-corrosion coating containing graphitized carbon-coated zinc powder, the method comprising the following preparation steps:

[0045] Step 1: Zinc powder was washed five times with acetone and 70wt% ethanol aqueous solution, and dried at 80℃. Polyvinylpyrrolidone and anhydrous ethanol were mixed at a mass ratio of 1:32 and stirred at room temperature for 20 min to obtain a polyvinylpyrrolidone solution. The washed and dried zinc powder was mixed with the polyvinylpyrrolidone solution at a mass ratio of 1:6 and dried at 80℃ to obtain pretreated zinc powder. The pretreated zinc powder was placed in a tube furnace and calcined at high temperature under argon protection at 410℃ for 4 h. After cooling to room temperature, graphitized carbon-coated zinc powder was obtained.

[0046] Step 2: Tetramethyldivinyldisiloxane and diethyl phosphite were dissolved in toluene at a molar ratio of 1:2.3 in 12 times the mass of tetramethyldivinyldisiloxane. Azobisisobutyronitrile was added at a molar ratio of 0.02 times the mass of tetramethyldivinyldisiloxane. The mixture was reacted at 80°C for 8 hours, then evaporated under reduced pressure, washed with ethanol, and dried under vacuum at 70°C to obtain a phosphorus-silicon flame retardant. The phosphorus-silicon flame retardant and 1,3-propanediamine were weighed at a molar ratio of 1:8. Under nitrogen protection, 1,3-propanediamine and N,N-dimethylformamide were mixed at a mass ratio of 1:18. The mixture was heated to 100°C, and the phosphorus-silicon flame retardant was added in 4 portions over 1 hour. After the addition was complete, the mixture was heated to 140°C and refluxed for 7 hours. The mixture was then evaporated under reduced pressure, washed with ethanol, and dried under vacuum at 70°C to obtain a phosphorus-silicon flame retardant curing agent.

[0047] Step 3: Mix magnesium hydroxide, anhydrous ethanol, and deionized water at a mass ratio of 1:40:14, sonicate for 30 min, add 0.08 times the mass of magnesium hydroxide in KH550 silane coupling agent, sonicate for 2 h, heat to 80℃ and stir for 3 h under nitrogen protection, filter, wash with anhydrous ethanol and deionized water, and vacuum dry at 60℃ for 10 h to obtain surface-treated magnesium hydroxide; Mix surface-treated magnesium hydroxide, oxybenzone, and N,N-dimethylformamide at a mass ratio of 1:0.4:30, sonicate for 40 min, heat to 100℃ and stir for 1 h, add 6 times the mass of oxybenzone in acetic acid, continue stirring for 2 h, filter, wash with anhydrous ethanol, and vacuum dry at 60℃ to constant weight to obtain functionalized magnesium hydroxide;

[0048] Step 4: By weight, 70 parts epoxy resin, 18 parts graphitized carbon-coated zinc powder, 8 parts functionalized magnesium hydroxide, 6 parts phosphorus-silicon flame retardant curing agent, 4 parts diethylenetriamine, 9 parts glycidyl butyl ether, and 14 parts acetone; mix the epoxy resin, graphitized carbon-coated zinc powder, functionalized magnesium hydroxide, glycidyl butyl ether, and acetone evenly, stir at room temperature for 20 minutes, add the phosphorus-silicon flame retardant curing agent and diethylenetriamine, continue stirring for 5 minutes, and degas under vacuum to obtain an anti-corrosion coating containing graphitized carbon-coated zinc powder.

[0049] Comparative Example 1

[0050] The preparation method of the anti-corrosion coating containing graphitized carbon-coated zinc powder in Comparative Example 1 differs from that in Example 2 in that step 1 is omitted, and in step 4, "graphitized carbon-coated zinc powder" is replaced with "zinc powder". The remaining steps are the same as in Example 2.

[0051] Comparative Example 2

[0052] The preparation method of the anti-corrosion coating containing graphitized carbon-coated zinc powder in Comparative Example 2 differs from that in Example 2 in that step 2 is omitted, and in step 4, the "phosphorus-silicon flame retardant curing agent" is replaced with "diethylenetriamine". The remaining steps are the same as in Example 2.

[0053] Comparative Example 3

[0054] The preparation method of the anti-corrosion coating containing graphitized carbon-coated zinc powder in Comparative Example 3 differs from that in Example 2 in that step 3 is omitted, and "functionalized magnesium hydroxide" in step 4 is replaced with "magnesium hydroxide". The remaining steps are the same as in Example 2.

[0055] Effect detection

[0056] First, corrosion resistance test: The coatings prepared in the examples and comparative examples were applied to 150 mm × 70 mm × 0.28 mm tinplate sheets with a dry film thickness of 300 μm. The coatings were cured at room temperature for seven days. A neutral salt spray test was conducted in accordance with GB / T10125—2021 for 480 hours. After the test, the coatings were removed, cleaned, and the appearance of the coated sample surface was observed. The corrosion, rusting, and damage were recorded.

[0057] Second, flame retardancy test: The coatings prepared in the examples and comparative examples were poured into molds and cured at room temperature for 7 days. Samples with a length of 100 mm × 6.5 mm × 3 mm were prepared according to ASTM D2863-97, and the limiting oxygen index was tested using an HC-2C oxygen index tester.

[0058] Third, weather resistance test: The coatings prepared in the examples and comparative examples were applied to a cold-rolled steel plate of 70×150×0.8 mm with a dry film thickness of 100μm. The coatings were cured at room temperature for 7 days. An aging test was conducted using a xenon lamp in accordance with GB / T 1766-2008 for 400 hours. After the test, the yellowing and chalking of the paint surface were observed.

[0059] The results of the above tests are recorded in Table 1.

[0060] Table 1

[0061] 480h neutral salt spray LOI (%) 400h weather resistance Example 1 The paint film is intact. 30.91 Slight yellowing Example 2 The paint film is intact. 31.37 Slight yellowing Example 3 The paint film is intact. 31.42 Slight yellowing Comparative Example 1 Minor bubbling and cracking 30.14 Slight yellowing Comparative Example 2 The paint film is intact. 25.06 Slight yellowing Comparative Example 3 The paint film is intact. 29.53 Yellowing, powdering

[0062] Based on the above test results, it can be concluded that the anti-corrosion coating containing graphitized carbon-coated zinc powder provided in this application has excellent anti-corrosion, flame retardant and weather-resistant properties.

[0063] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended technical solutions rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the technical solutions are intended to be included within the present invention.

Claims

1. A corrosion-resistant coating containing graphitized carbon-coated zinc powder, characterized in that, By weight, it mainly includes: 60-70 parts epoxy resin, 14-18 parts graphitized carbon-coated zinc powder, 6-8 parts functionalized magnesium hydroxide, 5-6 parts phosphorus-silicon flame retardant curing agent, 3-4 parts diethylenetriamine, 7-9 parts glycidyl butyl ether, and 10-14 parts acetone.

2. The anti-corrosion coating containing graphitized carbon-coated zinc powder according to claim 1, characterized in that, The graphitized carbon-coated zinc powder is obtained by coating the surface of zinc powder with polyvinylpyrrolidone as a carbon source and then carbonizing it at high temperature.

3. The anti-corrosion coating containing graphitized carbon-coated zinc powder according to claim 1, characterized in that, The functionalized magnesium hydroxide is obtained by reacting surface-treated magnesium hydroxide with oxybenzone. The surface-treated magnesium hydroxide is obtained by reacting magnesium hydroxide and KH550 silane coupling agent.

4. The anti-corrosion coating containing graphitized carbon-coated zinc powder according to claim 1, characterized in that, The phosphorus-silicon flame retardant curing agent is prepared by reacting a phosphorus-silicon flame retardant with 1,3-propanediamine. The phosphorus-silicon flame retardant is prepared by reacting tetramethyldivinyldisiloxane and diethyl phosphite.

5. A method for preparing an anti-corrosion coating containing graphitized carbon-coated zinc powder, characterized in that, The preparation steps include the following: Step 1: Wash the zinc powder with acetone and 70wt% ethanol aqueous solution 3-5 times in sequence, and dry it at 70-80℃; mix polyvinylpyrrolidone and anhydrous ethanol at a mass ratio of 1:(26-32), stir at room temperature for 10-20 minutes to obtain a polyvinylpyrrolidone solution; mix the washed and dried zinc powder with the polyvinylpyrrolidone solution at a mass ratio of 1:(5-6), and dry it at 70-80℃ to obtain pretreated zinc powder; Pretreated zinc powder was placed in a tube furnace and calcined at high temperature under argon protection. The calcination temperature was 400~410℃ and the time was 4~5h. After cooling to room temperature, graphitized carbon-coated zinc powder was obtained. Step 2: Dissolve tetramethyldivinyldisiloxane and diethyl phosphite in a molar ratio of 1:(2.1~2.3) in toluene at 10~12 times the mass of tetramethyldivinyldisiloxane. Add azobisisobutyronitrile at 0.01~0.02 times the mass of tetramethyldivinyldisiloxane. React at 70~80℃ for 8~10h, rotary evaporate under reduced pressure, wash with ethanol, and dry under vacuum at 60~70℃ to obtain the phosphorus-silicon flame retardant; the molar ratio is... 1: (7~8) Weigh out the phosphorus-silicon flame retardant and 1,3-propanediamine; under nitrogen protection, mix 1,3-propanediamine and N,N-dimethylformamide in a mass ratio of 1: (14~18), heat to 100℃, add the phosphorus-silicon flame retardant in 4 portions over 1 hour, and after the addition is complete, heat to 136~140℃ and reflux for 7~8 hours. Then, evaporate under reduced pressure, wash with ethanol, and dry under vacuum at 60~70℃ to obtain the phosphorus-silicon flame retardant curing agent. Step 3: Mix surface-treated magnesium hydroxide, oxybenzone, and N,N-dimethylformamide in a mass ratio of 1:(0.3~0.4):(20~30), sonicate for 30~40 min, heat to 90~100℃ and stir for 1~2 h, add 5~6 times the mass of oxybenzone in acetic acid, continue stirring and react for 2~3 h, filter, wash with anhydrous ethanol, and vacuum dry at 50~60℃ to constant weight to obtain functionalized magnesium hydroxide; Step 4: Mix epoxy resin, graphitized carbon-coated zinc powder, functionalized magnesium hydroxide, glycidyl butyl ether, and acetone evenly, stir at room temperature for 10-20 minutes, add phosphorus-silicon flame retardant curing agent and diethylenetriamine, continue stirring for 3-5 minutes, and degas under vacuum to obtain an anti-corrosion coating containing graphitized carbon-coated zinc powder.

6. The method for preparing an anti-corrosion coating containing graphitized carbon-coated zinc powder according to claim 5, characterized in that, The zinc powder mentioned in step 1 is spherical zinc powder with a mesh size of 500.

7. The method for preparing an anti-corrosion coating containing graphitized carbon-coated zinc powder according to claim 5, characterized in that, The chemical formula for the reaction of the phosphorus-silicon flame retardant described in step 2 is as follows: 。 8. The method for preparing an anti-corrosion coating containing graphitized carbon-coated zinc powder according to claim 5, characterized in that, The preparation process of surface-treated magnesium hydroxide in step 3 is as follows: magnesium hydroxide, anhydrous ethanol, and deionized water are mixed in a mass ratio of 1:(34~40):(10~14), ultrasonicated for 20~30 min, and 0.06~0.08 times the mass of magnesium hydroxide is added as KH550 silane coupling agent. The mixture is ultrasonically dispersed for 1~2 h, and under nitrogen protection, the temperature is raised to 70~80℃ and stirred for 3~4 h. The mixture is then filtered, washed with anhydrous ethanol and deionized water, and vacuum dried at 50~60℃ for 10~14 h to obtain surface-treated magnesium hydroxide.

9. The method for preparing an anti-corrosion coating containing graphitized carbon-coated zinc powder according to claim 5, characterized in that, The amounts of epoxy resin, graphitized carbon-coated zinc powder, functionalized magnesium hydroxide, phosphorus-silicon flame retardant curing agent, diethylenetriamine, glycidyl butyl ether, and acetone used in step 4 are as follows: by weight, epoxy resin 60-70 parts, graphitized carbon-coated zinc powder 14-18 parts, functionalized magnesium hydroxide 6-8 parts, phosphorus-silicon flame retardant curing agent 5-6 parts, diethylenetriamine 3-4 parts, glycidyl butyl ether 7-9 parts, and acetone 10-14 parts.

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