Flame-retardant high-wear-resistance epoxy powder coating and preparation method thereof

Abstract

The invention relates to a flame-retardant high-wear-resistance epoxy powder coating and a preparation method thereof, and belongs to the technical field of powder coatings, the epoxy powder coating comprises the following raw materials: self-made epoxy resin, a curing agent, a brightener, benzoin, a leveling agent and a pigment filler. Molybdenum disulfide, carbon fiber and fumed silica are added in the process of self-preparing epoxy resin, and can synergistically provide higher hardness for the system; meanwhile, [(4-vinyl phenyl) methyl] diphenyl phosphine oxide is also added to promote the formation of a carbon layer, phenyltrimethoxysilane is added to improve the thermal stability of the epoxy resin, and a flame retardant HF-T1020 is added to promote the formation of a stable and compact carbon layer of a system; therefore, the powder coating prepared from the self-made epoxy resin disclosed by the invention has excellent wear resistance and flame retardance.

Description

Technical Field

[0001] The invention belongs to the technical field of powder coatings, and in particular relates to a flame retardant and highly wear-resistant epoxy powder coating and a preparation method thereof. Background Art

[0002] In today's industry, construction and many other fields, the surface protection of materials is of vital importance. As a widely used type of coating, epoxy powder coatings have occupied a prominent position in metal product coating, pipeline anti-corrosion and other aspects due to their good adhesion, chemical corrosion resistance and electrical insulation. However, with the increasing complexity of the use environment and the continuous improvement of material performance requirements, traditional epoxy powder coatings have gradually exposed defects in flame retardancy and wear resistance. The flame retardancy or wear resistance of existing epoxy powder coatings on the market has gradually been unable to meet the requirements of various industries. Therefore, the development of a highly flame retardant and highly wear-resistant epoxy powder coating to meet the needs of modern industry and social development for high-performance coating materials has important technical significance and broad application prospects. Summary of the invention

[0003] The purpose of the present invention is to provide a flame retardant and highly wear-resistant epoxy powder coating and a preparation method thereof, which solves the problem of poor wear resistance and flame retardancy of the powder coating in the prior art.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A flame retardant and highly wear-resistant epoxy powder coating, the epoxy powder coating specifically comprises the following raw materials in parts by weight:

[0006]

[0007]

[0008] As a preferred technical solution of the present invention, the method for preparing the homemade epoxy resin comprises:

[0009] S1, pre-treating part of the raw materials to obtain dried flame retardant and mixed material B for standby use;

[0010] S2. Add the dried flame retardant, [(4-vinylphenyl)methyl]diphenylphosphine oxide, phenyltrimethoxysilane, dibutyltin dilaurate and accelerator to the bisphenol A epoxy resin in sequence under nitrogen gas, control the temperature and stir once to obtain a mixture C, add the mixture B and perform ultrasound, add 4,4'-diaminodiphenyl sulfone and control the temperature and stir again, perform temperature control and cure once, and then control the temperature and cure again to obtain the homemade epoxy resin.

[0011] As a preferred technical solution of the present invention, step S1 is specifically as follows: drying the flame retardant under temperature control to obtain a dried flame retardant for standby use; mixing anhydrous ethanol, fumed silica, and silane coupling agent KH-570 evenly and dispersing by ultrasonication, filtering, and drying the filter residue to obtain modified fumed silica for standby use; mixing molybdenum disulfide and N,N-dimethylformamide evenly and ultrasonically to obtain a suspension A for standby use; mixing carbon fiber and anhydrous ethanol and dispersing by ultrasonication, adding silane coupling agent KH-560, stirring under temperature control to obtain a suspension B for standby use; mixing suspension A, suspension B, and modified fumed silica, ultrasonically controlling the temperature, washing, and drying to obtain a mixture A; mixing the mixture A and benzyl alcohol and ultrasonically treating for 20-40 minutes to obtain a mixture B for standby use.

[0012] Furthermore, the flame retardant model is HF-T1020, which was purchased from Zhongshan Kangnode New Materials Co., Ltd.; the flame retardant HF-T1020 is a new triazine macromolecular compound with a high decomposition temperature, extremely low water solubility and oil solubility, no migration and precipitation, and a wider range of applications; the fumed silica is 80-120nm, the carbon fiber diameter is 150-200nm, and the molybdenum disulfide item number is: M104967-100g, which was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0013] As a preferred technical solution of the present invention, the mass ratio of the anhydrous ethanol, the fumed silica, and the silane coupling agent KH-570 is 10-12:2:1-1.2; the amount ratio of the molybdenum disulfide and N,N-dimethylformamide is 0.025-0.027g:100mL; the amount ratio of the carbon fiber, anhydrous ethanol, and the silane coupling agent KH-560 is 0.1-0.12g:50-65mL:15-25mL; the mass ratio of the suspension A, the suspension B, and the modified fumed silica is 8-10:2-3:1-2; the mass ratio of the mixture A and benzyl alcohol is 1:1.2-1.5.

[0014] As a preferred technical solution of the present invention, the temperature of the temperature-controlled drying is 100-130°C, and the time is 2-3h; in the process of preparing modified fumed silica, the time of the ultrasonic dispersion is 20-30min; in the process of preparing suspension A, the time of the ultrasound is 0.5-1h; in the process of preparing suspension B, the time of the ultrasonic dispersion is 1-1.5h, and the temperature of the temperature-controlled stirring is 60-65°C, and the time is 5-6h; in the process of preparing mixed material A, the temperature of the temperature-controlled ultrasound is 95-100°C, and the time is 2-3h, and the washing is 3-4 times of washing with deionized water.

[0015] As a preferred technical solution of the present invention, the bisphenol A epoxy resin in step S2 includes E-44 and E-51; the accelerator includes accelerator UR300 purchased from Zhangjiagang Free Trade Zone Meicheng International Trade Co., Ltd.

[0016] As a preferred technical solution of the present invention, the mass ratio of the flame retardant, [(4-vinylphenyl)methyl]diphenylphosphine oxide, phenyltrimethoxysilane, dibutyltin dilaurate, accelerator, bisphenol A type epoxy resin, mixture B and 4,4'-diaminodiphenyl sulfone after drying in step S2 is 40-45:6-8:6-7:0.01-0.02:20-22:100-110:4-6:30-35.

[0017] As a preferred technical solution of the present invention, the temperature of the first temperature-controlled stirring is 115-120°C, and the time is 2-3h; the ultrasonic obtaining time is 0.5-1h; the temperature of the second temperature-controlled stirring is 165-170°C, and the time is 30-40min; the temperature of the first temperature-controlled curing is 120-125°C, and the time is 2-2.5h; the temperature of the second temperature-controlled curing is 175-180°C, and the time is 2-2.5h.

[0018] As a preferred technical solution of the present invention, the curing agent includes any one of 4,4'-diaminodiphenyl sulfone and 4,4'-diaminodiphenylmethane; the brightener includes SYZ-6701B, purchased from Dongguan Siyezi Plastic Co., Ltd.; the leveling agent includes BYK-320, purchased from Green Union (Jining) Chemical Technology Co., Ltd.; the color filler includes but is not limited to at least one of ultramarine, carbon black, molybdenum chrome red and cobalt green.

[0019] A method for preparing a flame retardant and highly wear-resistant epoxy powder coating comprises the following steps:

[0020] Weigh all raw materials according to the formula and mix them evenly, extrude and compress them into sheets in a twin-screw extruder, cool them to room temperature, crush, grind and sieve them to obtain the finished powder coating.

[0021] As a preferred technical solution of the present invention, the temperature of zone I of the twin-screw extruder is 95-105° C., and the temperature of zone II is 105-110° C.; the screening is through a 140-mesh screen.

[0022] Beneficial effects of the present invention:

[0023] (1) The van der Waals interaction between the molybdenum disulfide flakes added in the process of making the epoxy resin is weak, and they are easily adsorbed on the contact surface to form a friction film, which has a lubricating effect and can improve the wear resistance of the system to a certain extent; the added carbon fiber has strength and modulus along the axial direction, which can effectively increase the wear resistance of the system; at the same time, the present invention also selects fumed silica with a large specific surface area and good adsorption capacity and uses KH-570 for modification, so that a part of the fumed silica is adsorbed on the molybdenum disulfide to form a thin film, avoiding the sedimentation of molybdenum disulfide in the system and increasing the degree of uniform lubrication of molybdenum disulfide, while the other part of the fumed silica can coat the carbon fiber and form a denser protective layer, so that the molybdenum disulfide, carbon fiber and fumed silica can synergistically provide the system with higher hardness, thereby making the powder coating made of the homemade epoxy resin of the present invention have excellent wear resistance.

[0024] (2) In the process of making the epoxy resin, the present invention adds [(4-vinylphenyl)methyl]diphenylphosphine oxide to promote the formation of a carbon layer, thereby hindering the transfer of combustible gas and heat to the interior; phenyltrimethoxysilane is added to improve the thermal stability of the epoxy resin, thereby achieving the synergistic modification of phosphorus and silicon. On this basis, the flame retardant HF-T1020 is also added to further improve the carbonization ability of the powder coating during the combustion process, thereby promoting the formation of a stable and dense carbon layer in the system, thereby isolating the infiltration of external oxygen and heat energy, so that the powder coating made using the homemade epoxy resin of the present invention has outstanding flame retardancy. DETAILED DESCRIPTION

[0025] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Example 1

[0027] A flame retardant and highly wear-resistant epoxy powder coating, the epoxy powder coating specifically comprises the following raw materials in parts by weight:

[0028]

[0029] The preparation method of the homemade epoxy resin comprises:

[0030] S1. Dry the flame retardant HF-T1020 at 100°C for 2.5h to obtain a dried flame retardant for later use;

[0031] Anhydrous ethanol, fumed silica and silane coupling agent KH-570 were mixed uniformly in a mass ratio of 10:2:1.1 and ultrasonically dispersed for 30 minutes, filtered, and the filter residue was dried to obtain modified fumed silica for later use;

[0032] Molybdenum disulfide and N,N-dimethylformamide were mixed uniformly at a ratio of 0.025 g:100 mL, and ultrasonicated for 0.5 h to obtain a suspension A for later use;

[0033] The carbon fiber and anhydrous ethanol were mixed and ultrasonically dispersed for 1 hour, and the silane coupling agent KH-560 was added, and the temperature was controlled at 62.5°C and stirred for 5 hours to obtain a suspension B for standby use;

[0034] The usage ratio of the carbon fiber, anhydrous ethanol and silane coupling agent KH-560 is 0.1g:50mL:15mL;

[0035] The suspension A, suspension B and modified fumed silica were mixed in a mass ratio of 8:2.5:1.5 and ultrasonically treated at 95°C for 2 hours, washed with deionized water for 3 times, and dried to obtain a mixture A. The mixture A and benzyl alcohol were mixed in a mass ratio of 1:1.2 and ultrasonically treated for 30 minutes to obtain a mixture B for standby use;

[0036] S2, nitrogen is passed through, and the dried flame retardant, [(4-vinylphenyl)methyl]diphenylphosphine oxide, phenyltrimethoxysilane, dibutyltin dilaurate, and accelerator UR300 are added to bisphenol A epoxy resin E-44 in sequence, and the mixture is stirred at 115°C for 2 hours to obtain a mixture C, and the mixture B is added and ultrasonicated for 0.5 hours, and 4,4'-diaminodiphenyl sulfone is added and the temperature is controlled at 165°C for 30 minutes, and the mixture is cured at 120°C for 2 hours, and then cured at 177.5°C for 2.5 hours to obtain a homemade epoxy resin;

[0037] The mass ratio of the dried flame retardant, [(4-vinylphenyl)methyl]diphenylphosphine oxide, phenyltrimethoxysilane, dibutyltin dilaurate, accelerator, bisphenol A epoxy resin, mixture B and 4,4'-diaminodiphenyl sulfone is 45:6:6.5:0.01:20:105:4:35.

[0038] A method for preparing a flame retardant and highly wear-resistant epoxy powder coating comprises the following steps:

[0039] Weigh the above raw materials according to the formula and mix them evenly, extrude and compress them into tablets in a twin-screw extruder, cool them to room temperature, crush and grind them, and pass them through a 140-mesh sieve to obtain a powder coating product;

[0040] The temperature of zone I of the twin-screw extruder was 95°C, and the temperature of zone II was 110°C.

[0041] Example 2

[0042] A flame retardant and highly wear-resistant epoxy powder coating, the epoxy powder coating specifically comprises the following raw materials in parts by weight:

[0043]

[0044] The preparation method of the homemade epoxy resin comprises:

[0045] S1. Dry the flame retardant HF-T1020 at 130°C for 2h to obtain a dried flame retardant for later use;

[0046] Anhydrous ethanol, fumed silica and silane coupling agent KH-570 were mixed uniformly in a mass ratio of 11:2:1 and ultrasonically dispersed for 20 minutes, filtered, and the filter residue was dried to obtain modified fumed silica for later use;

[0047] Molybdenum disulfide and N,N-dimethylformamide were mixed evenly at a ratio of 0.026 g:100 mL, and ultrasonicated for 1 h to obtain a suspension A for later use;

[0048] The carbon fiber and anhydrous ethanol were mixed and ultrasonically dispersed for 1 hour, and the silane coupling agent KH-560 was added, and the temperature was controlled at 60°C and stirred for 6 hours to obtain a suspension B for standby use;

[0049] The usage ratio of the carbon fiber, anhydrous ethanol and silane coupling agent KH-560 is 0.11 g: 65 mL: 20 mL;

[0050] The suspension A, suspension B and modified fumed silica were mixed in a mass ratio of 9:3:1 and subjected to ultrasonic treatment at 97.5°C for 2.5 hours, washed with deionized water for 4 times, and dried to obtain a mixture A. The mixture A and benzyl alcohol were mixed in a mass ratio of 1:1.5 and subjected to ultrasonic treatment for 20 minutes to obtain a mixture B for later use;

[0051] S2, nitrogen is passed through, and the dried flame retardant, [(4-vinylphenyl)methyl]diphenylphosphine oxide, phenyltrimethoxysilane, dibutyltin dilaurate, and accelerator UR300 are added to bisphenol A epoxy resin E-51 in sequence, and the mixture is stirred at 118°C for 2.5 hours to obtain a mixture C, and the mixture B is added and ultrasonicated for 1 hour, and 4,4'-diaminodiphenyl sulfone is added and the mixture is stirred at 170°C for 35 minutes, and the mixture is cured at 125°C for 2 hours, and then cured at 175°C for 2 hours to obtain a homemade epoxy resin;

[0052] The mass ratio of the dried flame retardant, [(4-vinylphenyl)methyl]diphenylphosphine oxide, phenyltrimethoxysilane, dibutyltin dilaurate, accelerator, bisphenol A epoxy resin, mixture B and 4,4'-diaminodiphenyl sulfone is 42.5:7:7:0.02:21:110:5:32.5.

[0053] A method for preparing a flame retardant and highly wear-resistant epoxy powder coating comprises the following steps:

[0054] Weigh the above raw materials according to the formula and mix them evenly, extrude and compress them into tablets in a twin-screw extruder, cool them to room temperature, crush and grind them, and pass them through a 140-mesh sieve to obtain a powder coating product;

[0055] The temperature of zone I of the twin-screw extruder is 100°C, and the temperature of zone II is 105°C.

[0056] Example 3

[0057] A flame retardant and highly wear-resistant epoxy powder coating, the epoxy powder coating specifically comprises the following raw materials in parts by weight:

[0058]

[0059]

[0060] The preparation method of the homemade epoxy resin comprises:

[0061] S1. Dry the flame retardant HF-T1020 at 115°C for 3 hours to obtain a dried flame retardant for later use;

[0062] Anhydrous ethanol, fumed silica and silane coupling agent KH-570 were mixed uniformly in a mass ratio of 12:2:1.2 and ultrasonically dispersed for 25 minutes, filtered, and the filter residue was dried to obtain modified fumed silica for later use;

[0063] Molybdenum disulfide and N,N-dimethylformamide were mixed evenly at a ratio of 0.027 g:100 mL, and ultrasonicated for 1 h to obtain a suspension A for later use;

[0064] The carbon fiber and anhydrous ethanol were mixed and ultrasonically dispersed for 1.5 hours, and the silane coupling agent KH-560 was added, and the temperature was controlled at 65°C and stirred for 5.5 hours to obtain a suspension B for standby use;

[0065] The usage ratio of the carbon fiber, anhydrous ethanol and silane coupling agent KH-560 is 0.12g:57.5mL:25mL;

[0066] The suspension A, the suspension B and the modified fumed silica were mixed in a mass ratio of 10:2:2 and subjected to ultrasonic treatment at 100°C for 3 h, washed with deionized water for 3 times, and dried to obtain a mixture A. The mixture A and benzyl alcohol were mixed in a mass ratio of 1:1.3 and subjected to ultrasonic treatment for 40 min to obtain a mixture B for later use;

[0067] S2, nitrogen is passed through, and the dried flame retardant, [(4-vinylphenyl)methyl]diphenylphosphine oxide, phenyltrimethoxysilane, dibutyltin dilaurate, and accelerator UR300 are added to bisphenol A epoxy resin E-44 in sequence, and the mixture is stirred at 120°C for 3 hours to obtain a mixture C, and the mixture B is added and ultrasonicated for 1 hour, and 4,4'-diaminodiphenyl sulfone is added and the temperature is controlled at 167.5°C for 40 minutes, and the mixture is cured at 123°C for 2.5 hours, and then cured at 180°C for 2 hours to obtain a homemade epoxy resin;

[0068] The mass ratio of the dried flame retardant, [(4-vinylphenyl)methyl]diphenylphosphine oxide, phenyltrimethoxysilane, dibutyltin dilaurate, accelerator, bisphenol A epoxy resin, mixture B and 4,4'-diaminodiphenyl sulfone is 40:8:6:0.015:22:100:6:3.

[0069] A method for preparing a flame retardant and highly wear-resistant epoxy powder coating comprises the following steps:

[0070] Weigh the above raw materials according to the formula and mix them evenly, extrude and compress them into tablets in a twin-screw extruder, cool them to room temperature, crush and grind them, and pass them through a 140-mesh sieve to obtain a powder coating product;

[0071] The temperature of zone I of the twin-screw extruder is 105°C, and the temperature of zone II is 110°C.

[0072] Comparative Example 1

[0073] Compared with Example 3, the difference is that in the step S1 of preparing the homemade epoxy resin in Comparative Example 1, modified fumed silica is not added, and is replaced by suspension A with half the mass of modified fumed silica and suspension B with half the mass of modified fumed silica, and the remaining operating steps and parameters are the same.

[0074] Comparative Example 2

[0075] Compared with Example 3, the difference is that in the step S1 of preparing the homemade epoxy resin in Comparative Example 2, suspension A is not added, and is replaced by modified fumed silica with half the mass of suspension A and suspension B with half the mass of suspension A, and the other operating steps and parameters are the same.

[0076] Comparative Example 3

[0077] Compared with Example 3, the difference is that in the step S1 of preparing the homemade epoxy resin in Comparative Example 3, suspension B is not added, and is replaced by modified fumed silica with half the mass of suspension B and suspension A with half the mass of suspension B, and the other operating steps and parameters are the same.

[0078] Comparative Example 4

[0079] Compared with Example 3, the difference is that in Comparative Example 4, in step S2 of preparing the homemade epoxy resin, no [(4-vinylphenyl)methyl]diphenylphosphine oxide is added, and [(4-vinylphenyl)methyl]diphenylphosphine oxide is replaced by phenyltrimethoxysilane with half the mass of [(4-vinylphenyl)methyl]diphenylphosphine oxide and a flame retardant with half the mass of [(4-vinylphenyl)methyl]diphenylphosphine oxide, and the remaining operating steps and parameters are the same.

[0080] Comparative Example 5

[0081] Compared with Example 3, the difference is that in the step S2 of preparing the homemade epoxy resin in Comparative Example 5, phenyltrimethoxysilane is not added, and [(4-vinylphenyl)methyl]diphenylphosphine oxide with half the mass of phenyltrimethoxysilane and a flame retardant with half the mass of phenyltrimethoxysilane are used instead, and the remaining operating steps and parameters are the same.

[0082] Comparative Example 6

[0083] Compared with Example 3, the difference is that in Comparative Example 6, no flame retardant is added in step S2 of preparing the homemade epoxy resin, and [(4-vinylphenyl)methyl]diphenylphosphine oxide with half the mass of the flame retardant and phenyltrimethoxysilane with half the mass of the flame retardant are used instead, and the remaining operating steps and parameters are the same.

[0084] Test Example 1

[0085] Preparation of test samples: Under the same spraying pressure, the powder coating products prepared in Examples 1-3 and Comparative Examples 1-3 were sprayed on standard test plates preheated in an oven at 1800°C by high-voltage electrostatic spraying, with a spray coating thickness of about 100 μm, a curing temperature of 200°C, and a curing time of 5 minutes to prepare test samples. Among them, the standard test plate used for the test was a steel plate, and was pretreated according to "GB / T9271-2008 Standard Test Plate for Paint and Varnish".

[0086] Wear resistance test: Fix the test sample on a rotating platform with the outer surface of the sample facing upwards, lower two grinding wheels with a certain load so that they just touch the surface of the sample, set the speed to 60r / min, use CS-10 grinding wheel, test time 1h, and record the weight loss (mg) of each test sample after wear. The lower the weight loss, the better the wear resistance of the paint film; the results are shown in Table 1.

[0087] Table 1

[0088] Friction weight loss (mg) Example 1 38 Example 2 39 Example 3 36 Comparative Example 1 68 Comparative Example 2 55 Comparative Example 3 64

[0089] It can be seen from Table 1 that the powder coating prepared by the present invention has excellent wear resistance.

[0090] Test Example 2

[0091] The flame retardant properties of the powder coating products prepared in Examples 1-3 and Comparative Examples 4-6 were tested according to UL 94 test standard. The results are shown in Table 2.

[0092] Table 2

[0093] Flame retardant grade Example 1 V-0 Example 2 V-0 Example 3 V-0 Comparative Example 4 V-2 Comparative Example 5 V-2 Comparative Example 6 V-1

[0094] It can be seen from Table 2 that the powder coating prepared by the present invention has outstanding flame retardancy.

[0095] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0096] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A flame retardant and highly wear-resistant epoxy powder coating, characterized in that: The epoxy powder coating specifically comprises the following raw materials in parts by weight:

2. The flame retardant and highly wear-resistant epoxy powder coating according to claim 1, characterized in that: The preparation method of the homemade epoxy resin comprises: S1, pre-treating part of the raw materials to obtain dried flame retardant and mixed material B for standby use; S2. Add the dried flame retardant, [(4-vinylphenyl)methyl]diphenylphosphine oxide, phenyltrimethoxysilane, dibutyltin dilaurate and accelerator to the bisphenol A epoxy resin in sequence under nitrogen gas, control the temperature and stir once to obtain a mixture C, add the mixture B and perform ultrasound, add 4,4'-diaminodiphenyl sulfone and control the temperature and stir again, perform temperature control and cure once, and then control the temperature and cure again to obtain the homemade epoxy resin.

3. The flame retardant and highly wear-resistant epoxy powder coating according to claim 2, characterized in that: Step S1 is specifically as follows: drying the flame retardant under temperature control to obtain a dried flame retardant for standby use; mixing anhydrous ethanol, fumed silica, and silane coupling agent KH-570 evenly and dispersing by ultrasonication, filtering, and drying the filter residue to obtain modified fumed silica for standby use; mixing molybdenum disulfide and N,N-dimethylformamide evenly and ultrasonically to obtain a suspension A for standby use; mixing carbon fiber and anhydrous ethanol and dispersing by ultrasonication, adding silane coupling agent KH-560, stirring under temperature control to obtain a suspension B for standby use; mixing suspension A, suspension B, and modified fumed silica, ultrasonically controlling temperature, washing, and drying to obtain a mixture A; mixing the mixture A and benzyl alcohol and ultrasonically treating for 20-40 minutes to obtain a mixture B for standby use.

4. The flame retardant and highly wear-resistant epoxy powder coating according to claim 3, characterized in that: The mass ratio of the anhydrous ethanol, the fumed silica, and the silane coupling agent KH-570 is 10-12:2:1-1.2; the amount ratio of the molybdenum disulfide and N,N-dimethylformamide is 0.025-0.027g:100mL; the amount ratio of the carbon fiber, anhydrous ethanol, and the silane coupling agent KH-560 is 0.1-0.12g:50-65mL:15-25mL; the mass ratio of the suspension A, the suspension B, and the modified fumed silica is 8-10:2-3:1-2; the mass ratio of the mixture A and benzyl alcohol is 1:1.2-1.

5.

5. The flame retardant and highly wear-resistant epoxy powder coating according to claim 2, characterized in that: In step S2, the bisphenol A type epoxy resin includes E-44 type and E-51 type; the accelerator includes accelerator UR300.

6. The flame retardant and highly wear-resistant epoxy powder coating according to claim 2, characterized in that: After drying in step S2, the mass ratio of the flame retardant, [(4-vinylphenyl)methyl]diphenylphosphine oxide, phenyltrimethoxysilane, dibutyltin dilaurate, accelerator, bisphenol A epoxy resin, mixture B and 4,4'-diaminodiphenyl sulfone is 40-45:6-8:6-7:0.01-0.02:20-22:100-110:4-6:30-35.

7. The flame retardant and highly wear-resistant epoxy powder coating according to claim 1, characterized in that: The curing agent includes any one of 4,4'-diaminodiphenyl sulfone and 4,4'-diaminodiphenylmethane; the brightener includes SYZ-6701B; the leveling agent includes BYK-320; and the pigment filler includes at least one of ultramarine, carbon black, molybdenum chrome red and cobalt green.

8. A method for preparing a flame retardant and highly wear-resistant epoxy powder coating according to any one of claims 1 to 7, characterized in that: The steps include: Weigh all raw materials according to the formula and mix them evenly, extrude and compress them into sheets in a twin-screw extruder, cool them to room temperature, crush, grind and sieve them to obtain the finished powder coating.

9. The method for preparing the flame retardant and highly wear-resistant epoxy powder coating according to claim 8, characterized in that: The temperature of zone I of the twin-screw extruder is 95-105° C., and the temperature of zone II is 105-110° C.; the screening is through a 140-mesh screen.

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