A coating for preventing cable surface from icing and a preparation method thereof

Abstract

The present invention relates to the technical field of coating preparation, specifically a coating for preventing cable surface icing and a preparation method thereof, comprising the following components by mass: 1-5 parts of modified fluorinated graphene particles, 1-2 parts of an emulsifier, 1-2 parts of a leveling agent, 80-100 parts of a fluorosilicone-acrylic copolymer resin emulsion, 10-20 parts of a water-based epoxy resin, 80-200 parts of deionized water, and 5-10 parts of a curing agent. The present invention effectively improves its compatibility with the water-based epoxy resin and improves hydrophobicity by adding modified fluorinated graphene particles. At the same time, the copolymerization of polyethylene glycol and the water-based epoxy resin produces polyether, which further improves hydrophobicity. The cross-linked network formed also improves the flexibility and impact resistance of the coating.

Description

Technical Field

[0001] The invention relates to the technical field of coating preparation, in particular to a coating for preventing icing on the surface of a cable and a preparation method thereof. Background Art

[0002] Paint, traditionally known as lacquer in China, is a viscous liquid applied to the surface of an object to be protected or decorated, forming a thin, continuous film that adheres firmly to the surface. It is typically a resin, oil, or emulsion, with or without pigments, fillers, and additives, and is prepared using organic solvents or water.

[0003] Coatings are widely used. For example, to protect cables, coatings are applied to the outer layer of the cable. In winter, to prevent moisture from freezing on the cable surface and causing cable breakage, modern cable coatings are required to have certain hydrophobic properties. Graphene fluoride is a useful additive in cable coatings. Due to its high hydrophobicity, graphene fluoride can effectively improve the hydrophobicity of the coating. However, due to its low surface energy, graphene fluoride easily accumulates in the coating components and has poor compatibility with water-based resins, resulting in a decrease in the overall hydrophobicity of the coating. To this end, in response to the problems raised in the above background technology, those skilled in the art have proposed a coating for preventing cable surface icing and a preparation method thereof. Summary of the Invention

[0004] The object of the present invention is to provide a coating for preventing cable surface from icing and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A coating for preventing cable surface from icing, comprising the following components in parts by mass:

[0007] 1-5 parts of modified fluorinated graphene particles, 1-2 parts of emulsifier, 1-2 parts of leveling agent, 80-100 parts of fluorosilicone acrylic copolymer resin emulsion, 10-20 parts of water-based epoxy resin, 80-200 parts of deionized water, and 5-10 parts of curing agent.

[0008] The modified fluorinated graphene particles are prepared by the following method:

[0009] S101, adding 3-aminopropyltriethoxysilane to a mixed solution of deionized water and ethanol, and then ultrasonically dispersing the fluorinated graphene in the mixed solution, heating the mixed solution in a water bath after the ultrasonication, washing the mixed solution with excess ethanol several times after the water bath is completed, and drying at low temperature to obtain pretreated fluorinated graphene particles;

[0010] S102, ultrasonically dispersing the pretreated fluorinated graphene particles in step S101 into deionized water to obtain solution a, and dissolving polyethylene glycol in deionized water to obtain solution b;

[0011] S103, adding solution b to solution a to obtain a modified solution, heating the modified solution in a water bath, stirring the solution during the water bath heating process, and vacuum drying the solution at 30-50° C. after the water bath heating. The dried product is modified fluorinated graphene.

[0012] Furthermore, in step S101, the ultrasonic time is 60-120 minutes, the power of the ultrasonic instrument is 50-80W, the water bath heating temperature is 70-85° C., and the water bath heating time is 4-7 hours.

[0013] Furthermore, the mass ratio of the fluorinated graphene particles, 3-aminopropyltriethoxysilane, deionized water and ethanol in the mixed solution of step S101 is 1:(2-5):(20-30):(80-120).

[0014] Furthermore, in step S102, the ultrasonic time is 30-50 minutes, and the power of the ultrasonic instrument is 50-80W.

[0015] Furthermore, in step S102, the mass ratio between the pretreated fluorinated graphene particles in solution a and deionized water is 1:(150-300), the mass ratio between the polyethylene glycol in solution b and deionized water is 1:(60-100), and the mass ratio between the pretreated fluorinated graphene particles in solution a and the polyethylene glycol in solution b is 1:(2-6).

[0016] Furthermore, in step S103, the water bath heating temperature of the modified liquid is 70-90° C., the water bath heating time is 2-6 hours, and the stirring speed is 300-500 rpm.

[0017] A method for preparing the above-mentioned coating for preventing cable surface icing comprises the following steps:

[0018] S1. Mixing the modified fluorinated graphene particles, emulsifier, leveling agent and fluorosilicone acrylic copolymer resin emulsion in parts by mass to obtain liquid A, and adding water-based epoxy resin to deionized water to obtain liquid B;

[0019] S2. Mix liquid A and liquid B evenly, add curing agent and continue to stir evenly to obtain a coating that prevents the cable surface from icing.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention improves the overall hydrophobicity of the coating by adding fluorinated graphene particles to the coating. The fluorinated graphene particles are modified with polyethylene glycol to form hydrogen bonds with the polyethylene glycol. Combined with the strong hydrophilicity of polyethylene glycol, the compatibility of the fluorinated graphene particles with the water-based epoxy resin is effectively improved, further improving the overall hydrophobicity of the coating.

[0022] 2. Polyethylene glycol not only acts as a carrier to make the fluorinated graphene particles more compatible with the water-based epoxy resin, but its alcoholic hydroxyl groups can open the epoxy ring and continue to react until a highly cross-linked polyether structure is formed. The formation of the polyether cross-linked structure not only improves the overall flexibility and impact resistance of the coating, but also consumes the highly hydrophilic alcoholic hydroxyl groups in the polyether structure, which also improves the hydrophobic properties of the coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A process flow chart for preparing a coating for preventing cable surface icing according to the present invention;

[0024] Figure 2 The process flow chart of preparing modified fluorinated graphene particles of the present invention;

[0025] Figure 3 This is an SEM image of the modified fluorinated graphene particles in Example 1 of the present invention;

[0026] Figure 4 This is a graph showing the hydrophobic performance of the coating for preventing cable surface icing prepared in Example 1 of the present invention (contact angle of about 140°);

[0027] Figure 5 This is a diagram showing the hydrophobic performance of the coating for preventing cable surface icing prepared in Comparative Example 3 of the present invention (contact angle of about 100°). DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0029] See also Figures 1 to 5 , the present invention provides a technical solution:

[0030] Example 1

[0031] A method for preparing a coating for preventing cable surface from icing comprises the following steps:

[0032] Mix 3 g of modified fluorinated graphene particles, 1 g of emulsifier, 1.5 g of leveling agent, and 92 g of fluorosilicone-acrylic copolymer resin emulsion to obtain liquid A; mix 18 g of water-based epoxy resin and 160 g of deionized water to obtain liquid B;

[0033] S2. Mix liquid A and liquid B evenly, then add 8g of curing agent and continue stirring evenly to obtain a coating that prevents the cable surface from icing.

[0034] The modified fluorinated graphene particles are prepared by the following method:

[0035] S101, adding 12.4g of 3-aminopropyltriethoxysilane to a mixed solution of 112g of deionized water and 440g of ethanol, and then ultrasonically dispersing 4.5g of fluorinated graphene into the mixed solution, the ultrasonic time is 85min, the power of the ultrasonicator is 75W, and after the ultrasonication, the mixed solution is heated in a water bath at a temperature of 80°C and a water bath heating time of 6h. After the water bath is completed, it is washed with excess ethanol several times and dried at low temperature to obtain pretreated fluorinated graphene particles;

[0036] S102, ultrasonically dispersing 4.2 g of the pretreated fluorinated graphene particles in step S101 into 800 g of deionized water to obtain solution a, with the ultrasonic time being 45 min and the power of the ultrasonicator being 70 W, and dissolving 11 g of polyethylene glycol in 700 g of deionized water to obtain solution b;

[0037] S103. Add solution b to solution a to obtain a modified solution, heat the modified solution in a water bath at a temperature of 85° C. for 5 h, stir at a speed of 450 rpm during the water bath heating process, and vacuum dry the solution at 40° C. After the water bath heating, the dried solution is modified fluorinated graphene.

[0038] Example 2

[0039] A method for preparing a coating for preventing cable surface from icing comprises the following steps:

[0040] Mix 1g of modified fluorinated graphene particles, 1g of emulsifier, 1g of leveling agent and 80g of fluorosilicone-acrylic copolymer resin emulsion to obtain liquid A; mix 10g of water-based epoxy resin and 80g of deionized water to obtain liquid B;

[0041] S2. Mix liquid A and liquid B evenly, then add 5g of curing agent and continue stirring evenly to obtain a coating that prevents the cable surface from icing.

[0042] The modified fluorinated graphene particles are prepared by the following method:

[0043] S101, adding 4 g of 3-aminopropyltriethoxysilane to a mixed solution of 40 g of deionized water and 160 g of ethanol, and then ultrasonically dispersing 2 g of fluorinated graphene into the mixed solution, the ultrasonic time is 60 min, the power of the ultrasonicator is 50 W, and after the ultrasonication, the mixed solution is heated in a water bath at a temperature of 70° C. and a water bath heating time of 4 h. After the water bath is completed, it is washed with excess ethanol several times and dried at low temperature to obtain pretreated fluorinated graphene particles;

[0044] S102, ultrasonically dispersing 1.8 g of the pretreated fluorinated graphene particles in step S101 into 270 g of deionized water to obtain solution a, the ultrasonic time is 30 min, the power of the ultrasonicator is 50 W, and dissolving 3.6 g of polyethylene glycol in 216 g of deionized water to obtain solution b;

[0045] S103. Add solution b to solution a to obtain a modified solution, heat the modified solution in a water bath at a temperature of 70° C. for 2 h, stir at a speed of 300 rpm during the water bath heating process, and vacuum dry at 30° C. after the water bath heating. The dried product is modified fluorinated graphene.

[0046] Example 3

[0047] A method for preparing a coating for preventing cable surface from icing comprises the following steps:

[0048] Mix 5g of modified fluorinated graphene particles, 2g of emulsifier, 2g of leveling agent and 100g of fluorosilicone-acrylic copolymer resin emulsion to obtain liquid A; mix 20g of water-based epoxy resin and 200g of deionized water to obtain liquid B;

[0049] S2. Mix liquid A and liquid B evenly, then add 10g of curing agent and continue stirring evenly to obtain a coating that prevents the cable surface from icing.

[0050] The modified fluorinated graphene particles are prepared by the following method:

[0051] S101, adding 41g of 3-aminopropyltriethoxysilane to a mixed solution of 246g of deionized water and 984g of ethanol, and then ultrasonically dispersing 8.2g of fluorinated graphene into the mixed solution, the ultrasonic time is 120min, the power of the ultrasonicator is 80W, and after the ultrasonication, the mixed solution is heated in a water bath at a temperature of 85°C and a water bath heating time of 7h. After the water bath is completed, it is washed with excess ethanol several times and dried at low temperature to obtain pretreated fluorinated graphene particles;

[0052] S102, ultrasonically dispersing 7.6 g of the pretreated fluorinated graphene particles in step S101 into 2280 g of deionized water to obtain solution a, with the ultrasonic time being 50 min and the power of the ultrasonicator being 80 W, and dissolving 45.6 g of polyethylene glycol in 4560 g of deionized water to obtain solution b;

[0053] S103. Add solution b to solution a to obtain a modified solution, heat the modified solution in a water bath at a temperature of 90° C. for 6 hours, stir at a speed of 500 rpm during the water bath heating process, and vacuum dry at 50° C. after the water bath heating. The dried product is modified fluorinated graphene.

[0054] Example 4

[0055] A method for preparing a coating for preventing cable surface from icing comprises the following steps:

[0056] Mix 2 g of modified fluorinated graphene particles, 1.4 g of emulsifier, 1.2 g of leveling agent, and 90 g of fluorosilicone-acrylic copolymer resin emulsion to obtain liquid A; mix 16 g of water-based epoxy resin and 120 g of deionized water to obtain liquid B;

[0057] S2. Mix liquid A and liquid B evenly, then add 8g of curing agent and continue stirring evenly to obtain a coating that prevents the cable surface from icing.

[0058] The modified fluorinated graphene particles are prepared by the following method:

[0059] S101, adding 6.2 g of 3-aminopropyltriethoxysilane to a mixed solution of 62 g of deionized water and 250 g of ethanol, and then ultrasonically dispersing 2.6 g of fluorinated graphene into the mixed solution, the ultrasonic time being 100 min, the power of the ultrasonicator being 70 W, and after the ultrasonication, heating the mixed solution in a water bath at a temperature of 85° C. for 6.5 h. After the water bath is completed, washing with excess ethanol several times and drying at low temperature to obtain pretreated fluorinated graphene particles;

[0060] S102, ultrasonically dispersing 2.2 g of the pretreated fluorinated graphene particles in step S101 into 400 g of deionized water to obtain solution a, with the ultrasonic time being 36 min and the power of the ultrasonicator being 80 W, and dissolving 4.8 g of polyethylene glycol in 420 g of deionized water to obtain solution b;

[0061] S103. Add solution b to solution a to obtain a modified solution, heat the modified solution in a water bath at a temperature of 90° C. for 3 h, stir at a speed of 350 rpm during the water bath heating process, and vacuum dry at 45° C. after the water bath heating. The dried product is modified fluorinated graphene.

[0062] The fluorinated graphene in the above embodiment uses activated carbon as a raw material and copper as a catalyst to obtain graphene particles under methane and hydrogen conditions, and the graphene particles are further fluorinated to obtain fluorinated graphene particles. The specific preparation steps are as follows:

[0063] Take activated carbon particles with a particle size of 1-10 microns, soak them in a 2mol / L copper sulfate solution, take them out after soaking for 4 hours, drain the water, and put them into the cavity of the hot wire chemical vapor deposition equipment. According to the methane-hydrogen ratio of 1:10, a mixed gas of methane and hydrogen is introduced. The process is carried out for 3 hours at a hot wire temperature of 2500℃ and an activated carbon surface temperature of 700℃. Graphene particles that grow upright on the surface of the activated carbon particles can be obtained. The SEM image is shown as follows: Figure 3 As shown;

[0064] Then, hydrogen fluoride and hydrogen were introduced into the chamber to fluorinate the graphene. The ratio of hydrogen fluoride to hydrogen was 1:20. The temperature of the hot wire and the temperature of the activated carbon were consistent with the conditions during graphene growth. The fluorination time was 30 minutes, thus obtaining fluorinated graphene particles.

[0065] The leveling agent used in the present invention is N3248 organosilicon polyether modified polysiloxane wetting and leveling agent, the emulsifier is OP-10 emulsifier, the model of waterborne epoxy resin is EPICLON H-505-42W, and the curing agent is triethylamine;

[0066] Fluorosilicone-acrylic copolymer resin emulsion was prepared as follows:

[0067] 900 g of octamethylcyclotetrasiloxane, 300 g of trifluoropropylmethylcyclotrisiloxane, 300 g of tetramethylammonium hydroxide and 3000 g of deionized water were prepared into an emulsion, and after nitrogen was introduced for deoxygenation for 10 minutes, the temperature was raised to 90° C. and kept warm for two hours to obtain a fluorine-containing silicone intermediate emulsion; 600 g of methyl methacrylate, 600 g of acrylic acid and 150 g of ammonium persulfate were added to the intermediate emulsion, stirred into a stable emulsion, and kept warm in a 60° C. water bath for 1 hour. After cooling to room temperature, the pH value was adjusted to neutral to obtain a fluorosilicone-acrylic copolymer resin emulsion.

[0068] Comparative Example 1

[0069] The difference between Comparative Example 1 and Example 1 is that step S101 is omitted, and fluorinated graphene particles are directly added in step S102. The remaining steps are exactly the same as in Example 1.

[0070] Comparative Example 2

[0071] The difference between Comparative Example 2 and Example 1 is that steps S102 and S103 are omitted, and pretreated fluorinated graphene particles are directly added to step S1 instead.

[0072] Comparative Example 3

[0073] The difference between Comparative Example 3 and Example 1 is that the modified fluorinated graphene particles in Example 1 are replaced with ordinary fluorinated graphene particles, and the remaining steps are exactly the same as those in Example 1.

[0074] After coating the coatings prepared in Examples 1-4 and Comparative Examples 1-3 (in order to accelerate the curing speed, infrared lamp irradiation can be used to make the coating surface temperature reach about 80°C), hydrophobicity test, flexibility test (test standard complies with GB / T 1731) and impact resistance test (test standard complies with GB / T1732-9) were respectively performed. The test results are shown in Table 1 below:

[0075] Table 1: Performance test table of coatings prepared in Examples 1-4 and Comparative Examples 1-3

[0076]

[0077]

[0078] It can be seen from the data of Example 1 and Comparative Example 2 in Table 1 above that after the fluorinated graphene is modified by polyethylene glycol in the present invention, the compatibility of the fluorinated graphene with the water-based epoxy resin is greatly improved, thereby further improving the hydrophobicity of the coating. The pretreatment of the fluorinated graphene particles in step S101 enhances the dispersion and contact effect of the fluorinated graphene particles in the polyethylene glycol, and also improves the overall hydrophobicity of the coating. In addition, it can be seen from the data of Example 1 and Comparative Examples 2-3 that the polyethylene glycol of the present invention can not only be used for dispersing the fluorinated graphene particles and improving their compatibility with the water-based epoxy resin, but the introduction of polyethylene glycol also improves the overall flexibility and impact resistance of the coating.

[0079] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A coating for preventing cable surface from icing, characterized in that: The components by mass are as follows: 1-5 parts of modified fluorinated graphene particles, 1-2 parts of emulsifier, 1-2 parts of leveling agent, 80-100 parts of fluorosilicone acrylic copolymer resin emulsion, 10-20 parts of water-based epoxy resin, 80-200 parts of deionized water, and 5-10 parts of curing agent; The modified fluorinated graphene particles are prepared by the following method: S101, adding 3-aminopropyltriethoxysilane to a mixed solution of deionized water and ethanol, and then ultrasonically dispersing the fluorinated graphene in the mixed solution, heating the mixed solution in a water bath after the ultrasonication, washing the mixed solution with excess ethanol several times after the water bath is completed, and drying at low temperature to obtain pretreated fluorinated graphene particles; S102, ultrasonically dispersing the pretreated fluorinated graphene particles in step S101 into deionized water to obtain solution a, and dissolving polyethylene glycol in deionized water to obtain solution b; S103, adding solution b to solution a to obtain a modified solution, heating the modified solution in a water bath while stirring during the water bath heating process, and vacuum drying at 30-50° C. after the water bath heating, to obtain a dried product as modified fluorinated graphene particles; In step S101, the ultrasonic time is 60-120 minutes, the power of the ultrasonic instrument is 50-80W, the water bath heating temperature is 70-85°C, and the water bath heating time is 4-7 hours; The mass ratio of the fluorinated graphene particles, 3-aminopropyltriethoxysilane, deionized water and ethanol in the mixed solution of step S101 is 1:(2-5):(20-30):(80-120); In step S102, the mass ratio between the pretreated fluorinated graphene particles in solution a and deionized water is 1:(150-300), the mass ratio between the polyethylene glycol in solution b and deionized water is 1:(60-100), and the mass ratio between the pretreated fluorinated graphene particles in solution a and the polyethylene glycol in solution b is 1:(2-6).

2. The anti-icing coating for cable surface according to claim 1, characterized in that: In step S102, the ultrasonic time is 30-50 minutes, and the power of the ultrasonic instrument is 50-80W.

3. The coating for preventing cable surface from icing according to claim 1, characterized in that: In step S103, the water bath heating temperature of the modified liquid is 70-90° C., the water bath heating time is 2-6 hours, and the stirring speed is 300-500 rpm.

4. A method for preparing a coating for preventing cable surface icing according to any one of claims 1 to 3, characterized in that: The steps include: S1. Mixing the modified fluorinated graphene particles, emulsifier, leveling agent and fluorosilicone acrylic copolymer resin emulsion in parts by mass to obtain liquid A, and adding water-based epoxy resin to deionized water to obtain liquid B; S2. Mix liquid A and liquid B evenly, add curing agent and continue to stir evenly to obtain a coating that prevents the cable surface from icing.

Images