Coating for preventing cable surface from icing and preparation method thereof

Abstract

The invention relates to the technical field of coating preparation, in particular to a coating for preventing cable surface icing and a preparation method thereof.The coating is prepared from, by mass, 1-5 parts of modified fluorinated graphene particles, 1-2 parts of emulsifier, 1-2 parts of flatting agent, 80-100 parts of fluorosilicone acrylic copolymer resin emulsion, 10-20 parts of water-borne epoxy resin, 80-200 parts of deionized water and 5-10 parts of curing agent. By adding the modified fluorinated graphene particles, the compatibility of the modified fluorinated graphene particles and the waterborne epoxy resin is effectively improved, the hydrophobicity is improved, meanwhile, polyether is generated through copolymerization of polyethylene glycol and the waterborne epoxy resin, the hydrophobicity is further improved, and the flexibility and impact resistance of the coating are further improved through a formed cross-linked network.

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 paint in China, is a viscous liquid coated on the surface of an object to be protected or decorated, and can form a continuous film that is firmly attached to the object. It is usually mainly resin, oil, or emulsion, with or without pigments, fillers, and corresponding additives, and is prepared with organic solvents or water.

[0003] There are many fields of coating application. For example, in order to protect the cable, the outer layer of the cable will be coated with coating. In winter, in order to prevent the moisture from remaining on the cable surface and freezing, causing the cable to break, the coating of modern cable coatings requires certain hydrophobic properties. Graphene fluoride is an additive available in cable coatings. Graphene fluoride can effectively improve the hydrophobicity of the coating due to its high hydrophobicity. However, graphene fluoride is easy to accumulate in the coating component due to its low surface energy, and has poor compatibility with water-based resins, resulting in a decrease in the overall hydrophobicity of the coating. To this end, in view of the problems raised in the above background technology, a coating for preventing the icing of the cable surface and a preparation method thereof are proposed by a person skilled in the art. Summary of the invention

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

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

[0006] A coating for preventing icing on the surface of a cable, comprising the following components 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 for multiple 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 into 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, and the dried product is modified fluorinated graphene.

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

[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 from icing comprises the following steps:

[0018] S1. Mix the modified fluorinated graphene particles, emulsifier, leveling agent and fluorosilicone-acrylic copolymer resin emulsion uniformly according to mass fraction to obtain liquid A, and add water-based epoxy resin into 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. In the present invention, the overall hydrophobicity of the coating is improved 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, and the overall hydrophobicity of the coating is further improved.

[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 from 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 a SEM image of the modified fluorinated graphene particles in Example 1 of the present invention;

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

[0027] Figure 5 This is a graph 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 be combined with the drawings in 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.

[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 icing on a cable surface comprises the following steps:

[0032] 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 were mixed evenly to obtain liquid A; 18 g of water-based epoxy resin and 160 g of deionized water were mixed evenly to obtain liquid B;

[0033] S2. Mix liquid A and liquid B evenly, then add 8g of curing agent and continue to stir 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 ultrasonic instrument 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 several times with excess ethanol 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, the ultrasonic time is 45 min, the power of the ultrasonicator is 70 W, and dissolving 11 g of polyethylene glycol into 700 g of deionized water to obtain solution b;

[0037] S103, adding solution b to solution a to obtain a modified solution, heating the modified solution in a water bath, the water bath heating temperature is 85° C., the water bath heating time is 5 h, the water bath heating process is stirred at a speed of 450 rpm, and after the water bath heating, vacuum drying is performed at 40° C. The dried product is modified fluorinated graphene.

[0038] Example 2

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

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

[0041] S2. Mix liquid A and liquid B evenly, then add 5g of curing agent and continue to stir 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 4g of 3-aminopropyltriethoxysilane to a mixed solution of 40g of deionized water and 160g of ethanol, and then ultrasonically dispersing 2g of fluorinated graphene into the mixed solution, the ultrasonic time is 60min, the power of the ultrasonic instrument is 50W, 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 4h. After the water bath is completed, it is washed with excess ethanol for multiple times, and low-temperature drying is performed 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 into 216 g of deionized water to obtain solution b;

[0045] S103, adding solution b to solution a to obtain a modified solution, heating the modified solution in a water bath, the water bath heating temperature is 70° C., the water bath heating time is 2 h, stirring at a speed of 300 rpm during the water bath heating process, and vacuum drying 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 icing on a cable surface comprises the following steps:

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

[0049] S2. Mix liquid A and liquid B evenly, then add 10g of curing agent and continue to stir 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 ultrasonic instrument 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 several times with excess ethanol 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, the ultrasonic time is 50 min, the power of the ultrasonicator is 80 W, and dissolving 45.6 g of polyethylene glycol into 4560 g of deionized water to obtain solution b;

[0053] S103, adding solution b to solution a to obtain a modified solution, heating the modified solution in a water bath, the water bath heating temperature is 90° C., the water bath heating time is 6 hours, stirring at a speed of 500 rpm during the water bath heating process, and vacuum drying 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 icing on a cable surface comprises the following steps:

[0056] 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 were mixed evenly to obtain liquid A; 16 g of water-based epoxy resin and 120 g of deionized water were mixed evenly to obtain liquid B;

[0057] S2. Mix liquid A and liquid B evenly, then add 8g of curing agent and continue to stir 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 6.2g of 3-aminopropyltriethoxysilane to a mixed solution of 62g of deionized water and 250g of ethanol, and then ultrasonically dispersing 2.6g of fluorinated graphene into the mixed solution, the ultrasonic time is 100min, the power of the ultrasonic instrument is 70W, 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 6.5h. After the water bath is completed, it is washed several times with excess ethanol and dried 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, the ultrasonic time is 36 min, the power of the ultrasonicator is 80 W, and dissolving 4.8 g of polyethylene glycol into 420 g of deionized water to obtain solution b;

[0061] S103, adding solution b to solution a to obtain a modified solution, heating the modified solution in a water bath, the water bath heating temperature is 90° C., the water bath heating time is 3 h, the water bath heating process is stirred at a speed of 350 rpm, and after the water bath heating, vacuum drying is performed at 45° C. 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 further fluorinates the graphene particles 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, put them into the cavity of the hot wire chemical vapor deposition equipment, and introduce a mixed gas of methane and hydrogen at a methane-hydrogen ratio of 1:10. Treat them for 3 hours at a hot wire temperature of 2500℃ and an activated carbon surface temperature of 700℃, and you can get graphene particles that grow upright on the surface of the activated carbon particles. The SEM picture is as follows: Figure 3 As shown;

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

[0065] The leveling agent used in the present invention is N3248 silicone 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 is prepared by the following method:

[0067] 900g of octamethylcyclotetrasiloxane, 300g of trifluoropropylmethylcyclotrisiloxane, 300g of tetramethylammonium hydroxide and 3000g of deionized water are prepared into an emulsion, and after nitrogen is introduced for deoxygenation for 10 minutes, the temperature is raised to 90°C and kept warm for two hours to obtain a fluorine-containing silicone intermediate emulsion; 600g of methyl methacrylate, 600g of acrylic acid and 150g of ammonium persulfate are added to the intermediate emulsion, stirred into a stable emulsion, kept warm in a 60°C water bath for 1 hour, cooled to room temperature and adjusted to a neutral pH value 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 instead, and the remaining steps are exactly the same as those 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 follows GB / T 1731) and impact resistance test (test standard follows GB / T1732-9) were respectively carried out. 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 the dispersion of the fluorinated graphene particles and improve their compatibility with the water-based epoxy resin, but also the introduction of polyethylene glycol also improves the overall flexibility and impact resistance of the coating.

[0079] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coating for preventing icing on the surface of a cable, 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 for multiple 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 into 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, stirring the solution during the water bath heating process, and vacuum drying the solution at 30-50° C. after the water bath heating, and the dried product is modified fluorinated graphene particles.

2. The coating for preventing cable surface from icing according to claim 1, characterized in that: In step S101, the ultrasonic time is 60-120 min, the power of the ultrasonic instrument is 50-80 W, the water bath heating temperature is 70-85° C., and the water bath heating time is 4-7 h.

3. The coating for preventing cable surface from icing according to claim 1, characterized in that: 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).

4. The coating for preventing cable surface from icing 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.

5. The coating for preventing cable surface from icing according to claim 1, characterized in that: 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).

6. The coating for preventing cable surface from icing according to claim 1, characterized in that: In the 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.

7. A method for preparing a coating for preventing cable surface from icing as claimed in any one of claims 1 to 6, characterized in that: The steps include: S1. Mix the modified fluorinated graphene particles, emulsifier, leveling agent and fluorosilicone-acrylic copolymer resin emulsion uniformly according to mass fraction to obtain liquid A, and add water-based epoxy resin into 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.

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