Insulating spray composite material for power transmission and distribution system and preparation method thereof

Abstract

The application relates to the technical field of paint, and discloses an insulating spray composite material for a power transmission and transformation system and a preparation method thereof. The insulating spray composite material for the power transmission and transformation system comprises the following raw materials in parts by mass: 100 parts of epoxy resin, 10 to 20 parts of silane-modified wear-resistant filler, 0 to 3 parts of defoaming agent, 0 to 10 parts of leveling agent, 0 to 5 parts of pigment, 3 to 6 parts of curing agent and 80 to 120 parts of solvent; the wear-resistant filler in the silane-modified wear-resistant filler is alumina composite cubic boron nitride. Through the technical scheme, the problem that the epoxy resin composite material in the related art adopts boron nitride as the wear-resistant filler and has poor wear resistance is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coating technology, in particular, relates to an insulating spray composite material for power transmission and distribution system and a preparation method thereof. BACKGROUND

[0002] The power transmission and distribution system is a component of the power system, including the substation and the transmission line. In the power transmission and distribution system, the external insulation of the electrical equipment of the substation and the insulator of the high-voltage transmission line all need to be protected. The insulating material used not only needs to have good insulating properties, but also needs to have good adhesion, hydrophobicity and aging resistance, so as to ensure the stable operation of the power transmission and distribution equipment.

[0003] At present, the commonly used insulating materials for the power transmission and distribution system are organic silicon resin composite materials or epoxy resin composite materials. Among them, the epoxy resin is more widely used due to its good adhesion and electrical insulation. In order to improve the wear resistance of the coating formed by the epoxy resin composite material, wear-resistant fillers are added. At present, the commonly used wear-resistant fillers are boron nitride, but the effect is very limited. SUMMARY

[0004] The present application provides an insulating spray composite material for power transmission and distribution system and a preparation method thereof, which solves the problem of poor wear resistance of the epoxy resin composite material using boron nitride as the wear-resistant filler in the related art.

[0005] The technical scheme of the present application is as follows:

[0006] An insulating spray composite material for power transmission and distribution system, comprising the following raw materials by mass fraction: epoxy resin 100 parts, silane modified wear-resistant filler 10-20 parts, defoaming agent 0-3 parts, leveling agent 0-10 parts, pigment 0-5 parts, curing agent 3-6 parts, solvent 80-120 parts; the wear-resistant filler in the silane modified wear-resistant filler is alumina composite cubic boron nitride.

[0007] In the present application, the epoxy resin is a bisphenol type epoxy resin, which contains a benzene ring in its structure and can provide certain rigidity to the insulating spray composite material, ensuring the hardness and wear resistance of the material. The grade of the bisphenol type epoxy resin may be one or more of E-51, E-44, E-42, E-20, E-09, E-06, E-03 and E-12, and is preferably E-44.

[0008] In the present application, the curing agent is a latent curing agent, which is stable at room temperature after being mixed with the epoxy resin, and can show its activity when heated to a certain temperature, thereby curing the epoxy resin. The latent curing agent may be one or more of dicyandiamide, butanone imine and boron trifluoride-amine complex, and is preferably dicyandiamide.

[0009] As a further technical solution, the raw material of the alumina composite cubic boron nitride comprises alumina and cubic boron nitride in a mass ratio of 1-5:100.

[0010] As a further technical solution, the particle size of the alumina is 10-200 nm, for example, 10 nm, 20 nm, 30 nm, 60 nm, 100 nm or 200 nm, but is not limited to the listed values, and other values not listed in the range are also applicable.

[0011] As a further technical solution, the particle size of the cubic boron nitride is 1-15 μm, for example, 1 μm, 3 μm, 5 μm, 10 μm, 13 μm or 15 μm, but is not limited to the listed values, and other values not listed in the range are also applicable.

[0012] As a further technical solution, the alumina composite cubic boron nitride is prepared by mixing alumina and cubic boron nitride and then ball milling to obtain the alumina composite cubic boron nitride.

[0013] In the present application, after mixing alumina and cubic boron nitride, the alumina is coated on the surface of the cubic boron nitride through the ball milling process, thereby preparing the alumina composite cubic boron nitride.

[0014] As a further technical solution, the rotation speed of the ball mill is 500-1000 rpm, and the ball milling time is 2-5 h.

[0015] As a further technical solution, the silane-modified wear-resistant filler comprises a phenylsilane-modified wear-resistant filler and an alkylsilane-modified wear-resistant filler, and the mass of the phenylsilane-modified wear-resistant filler is greater than the mass of the alkylsilane-modified wear-resistant filler.

[0016] In the present application, the phenylsilane-modified wear-resistant filler and the alkylsilane-modified wear-resistant filler are used in combination, further improving the wear resistance of the insulating spray composite material. The reason is that the phenyl groups in the phenylsilane-modified wear-resistant filler not only form π-π stacking with the benzene rings in the epoxy resin, but also provide a certain rigidity. At the same time, the alkyl chains in the alkylsilane-modified wear-resistant filler have a certain flexibility, which can play a role in dispersing stress and relieving interfacial stress concentration. Through the use of the phenylsilane-modified wear-resistant filler and the alkylsilane-modified wear-resistant filler in combination, the problem of too strong material rigidity leading to brittle coating and affecting wear resistance is avoided, and the problem of insufficient material rigidity leading to decreased wear resistance is also avoided.

[0017] As a further technical solution, the mass ratio of the phenylsilane-modified wear-resistant filler to the alkylsilane-modified wear-resistant filler is 3:2-7:3.

[0018] In the present application, the mass ratio of the phenyl silane modified wear-resistant filler and the alkyl silane modified wear-resistant filler is 3:2~7:3, which further improves the wear resistance of the insulating spray composite material.

[0019] In the present application, the phenyl silane may be one or more of diphenyl dimethoxysilane, diphenyl diethoxysilane, phenyl trimethoxysilane, phenyl triethoxysilane, methyl phenyl dimethoxysilane, methyl phenyl diethoxysilane, preferably phenyl triethoxysilane.

[0020] In the present application, the alkyl silane may be one or more of octyl trimethoxysilane, hexadecyl trimethoxysilane, n-octyl triethoxysilane, n-hexyl triethoxysilane, isobutyl triethoxysilane, propyl trimethoxysilane, propyl triethoxysilane, preferably n-octyl triethoxysilane.

[0021] As a further technical solution, the raw material of the silane modified wear-resistant filler includes silane and wear-resistant filler in a mass ratio of 1~3:20.

[0022] In the present application, the silane modified wear-resistant filler can be prepared by any conventional silane modification method. Preferably, the preparation method of the silane modified wear-resistant filler includes the following steps: dispersing the wear-resistant filler into a mixed solution of ethanol and water, adding silane dropwise, stirring, filtering, washing, drying, and obtaining the silane modified wear-resistant filler.

[0023] In the present application, the addition of the defoaming agent can effectively inhibit the generation of bubbles, and can promote the rupture and escape of the formed bubbles. Not only the structural integrity and insulation of the coating are ensured, but also the uniform molding of the material during the curing process is ensured, the adhesion between the coating and the substrate is improved, and stable and reliable insulation protection is provided for the power transmission and transformation equipment. The defoaming agent may be one or more of defoaming agent BYK-024, defoaming agent BYK-141, defoaming agent BYK-1765, defoaming agent BYK-1796, defoaming agent BYK-1760, defoaming agent BYK-054, preferably defoaming agent BYK-024.

[0024] In the present application, the addition of the leveling agent can reduce the surface tension of the insulating spray composite material, promote the uniform spreading of the material on the surface of the substrate, and reduce the generation of surface defects. At the same time, the leveling agent can prolong the leveling time of the material, so that the material can flow sufficiently before curing and form a smooth coating. The compactness and uniformity of the coating are enhanced, the uniform distribution of the insulation performance on the surface of the equipment is ensured, and the safe operation of the equipment is ensured. The leveling agent may be one or more of DiGua 410 leveling agent, DiGua TEGO-450 leveling agent, leveling agent BYK-306, leveling agent BYK-333, leveling agent BYK-346, preferably DiGua 410 leveling agent.

[0025] In the present application, the addition of pigments can impart specific colors to the coating, facilitating the identification and differentiation of different parts or different types of power transmission and transformation equipment. At the same time, the uniform dispersion of pigments can reduce the penetration of light on the coating, reduce the damage of ultraviolet light on the substrate, further protect the insulation performance and service life of the coating, and ensure the long-term stable operation of the power transmission and transformation equipment. The pigments may, for example, be one or more of red pigments, green pigments, yellow pigments, and blue pigments.

[0026] The present application also provides a preparation method of the insulating spray composite material for power transmission and transformation system, which is used for preparing the insulating spray composite material for power transmission and transformation system.

[0027] The working principle and beneficial effects of the present application are as follows:

[0028] 1. In the present application, the second superhard material, cubic boron nitride, which has a hardness only next to diamond, is used. The cubic boron nitride is first compounded with aluminum oxide and then modified with silane, which improves the wear resistance of the epoxy resin composite material when using boron nitride as wear-resistant filler, and also improves the hardness of the epoxy resin composite material. The reason is that cubic boron nitride has high hardness and wear resistance. After the cubic boron nitride is compounded with aluminum oxide and then modified with silane, a part of the groups in the silane molecules are first hydrolyzed to form silanol, which then reacts with the hydroxyl groups on the surface of the cubic boron nitride particles to form covalent bonds. At the same time, the silanols of each molecule of silane associate and oligomerize to form a network structure film covering the surface of the cubic boron nitride particles, which organicizes the surface of the cubic boron nitride particles. The other part of the hydrophobic groups in the silane molecules interact with or physically entangle with the epoxy resin, thereby combining the epoxy resin and the cubic boron nitride together and enhancing the compatibility between the epoxy resin and the cubic boron nitride, achieving the effect of improving the wear resistance and hardness of the insulating spray composite material.

[0029] 2. The insulating spray composite material provided by the present application has good insulation, hydrophobicity and adhesion, and good coagulation without dripping. It has a self-cleaning function. It can be applied in multiple scenarios, such as 220kV substation 35kV outgoing line 2km range insulation spraying, main transformer low voltage side insulation spraying, insulator anti-pollution flashover spraying, 35kV line insulation spraying where channel cleaning is difficult, switch cabinet anti-condensation spraying, etc. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0031] The parameters of each raw material in the following examples and comparative examples are as follows:

[0032] Epoxy resin: bisphenol A type epoxy resin with a brand of E-44, epoxy equivalent weight (g / eq): 184~194, viscosity (25℃, mpa.s): 11000~14000, color (Gardner method): ≤0.5, hydrolyzable chlorine (mass fraction, %): ≤0.1, volatile matter (mass fraction, %): ≤0.2, density (25℃, g / cm³): 1.16~1.18, acid value (mgKOH / g) ≤0.5.

[0033] Example 1

[0034] S1, 10 nm particle size of alumina and 5 μm particle size of cubic boron nitride were mixed according to a mass ratio of 1:100, and then ball-milled at 500 rpm for 5 h to obtain alumina composite cubic boron nitride;

[0035] S2, 20 parts of the alumina composite cubic boron nitride were dispersed in a mixed solution of 200 parts of ethanol and water (the mass ratio of ethanol to water in the mixed solution was 3:1), 1 part of phenyl triethoxysilane was added dropwise, and stirring was carried out at 70℃ for 12 h, followed by filtration, washing, and drying to obtain a silane-modified wear-resistant filler;

[0036] S3, 100 parts of epoxy resin, 10 parts of silane-modified wear-resistant filler, 1 part of defoaming agent BYK-024, 3 parts of DiGao 410 leveling agent, 3 parts of dicyandiamide, and 80 parts of anhydrous ethanol were uniformly mixed to obtain an insulating spray composite material for power transmission and transformation systems.

[0037] Example 2

[0038] S1, 30 nm particle size of alumina and 10 μm particle size of cubic boron nitride were mixed according to a mass ratio of 5:100, and then ball-milled at 1000 rpm for 2 h to obtain alumina composite cubic boron nitride;

[0039] S2, 20 parts of the alumina composite cubic boron nitride were dispersed in a mixed solution of 200 parts of ethanol and water (the mass ratio of ethanol to water in the mixed solution was 3:1), 3 parts of n-octyl triethoxysilane was added dropwise, and stirring was carried out at 70℃ for 12 h, followed by filtration, washing, and drying to obtain a silane-modified wear-resistant filler;

[0040] S3, 100 parts of epoxy resin, 20 parts of silane-modified wear-resistant filler, 3 parts of defoaming agent BYK-024, 5 parts of DiGao 410 leveling agent, 6 parts of dicyandiamide, and 120 parts of anhydrous ethanol were uniformly mixed to obtain an insulating spray composite material for power transmission and transformation systems.

[0041] Example 3

[0042] S1, 20 parts of cubic boron nitride were dispersed in 200 parts of a mixed solution of ethanol and water (the mass ratio of ethanol to water in the mixed solution was 3:1), 1 part of phenyl triethoxysilane was added dropwise, and stirring was performed at 70°C for 12h, followed by filtration, washing, and drying to obtain a silane-modified wear-resistant filler;

[0043] S2, 20 parts of the alumina composite cubic boron nitride were dispersed in 200 parts of a mixed solution of ethanol and water (the mass ratio of ethanol to water in the mixed solution was 3:1), 1 part of phenyl triethoxysilane was added dropwise, and stirring was performed at 70°C for 12h, followed by filtration, washing, and drying to obtain a phenylsilane-modified wear-resistant filler;

[0044] S3, 20 parts of the alumina composite cubic boron nitride were dispersed in 200 parts of a mixed solution of ethanol and water (the mass ratio of ethanol to water in the mixed solution was 3:1), 1 part of n-octyl triethoxysilane was added dropwise, and stirring was performed at 70°C for 12h, followed by filtration, washing, and drying to obtain an alkylsilane-modified wear-resistant filler;

[0045] S4, 100 parts of epoxy resin, 3 parts of the phenylsilane-modified wear-resistant filler, 7 parts of the alkylsilane-modified wear-resistant filler, 1 part of defoamer BYK-024, 3 parts of DiGao 410 leveling agent, 3 parts of dicyandiamide, and 80 parts of anhydrous ethanol were uniformly mixed to obtain an insulating spray composite material for power transmission and transformation systems.

[0046] Example 4

[0047] The difference from Example 3 is that 5 parts of the phenylsilane-modified wear-resistant filler and 5 parts of the alkylsilane-modified wear-resistant filler were used.

[0048] Example 5

[0049] The difference from Example 3 is that 6 parts of the phenylsilane-modified wear-resistant filler and 4 parts of the alkylsilane-modified wear-resistant filler were used.

[0050] Example 6

[0051] The difference from Example 3 is that 7 parts of the phenylsilane-modified wear-resistant filler and 3 parts of the alkylsilane-modified wear-resistant filler were used.

[0052] Example 7

[0053] The difference from Example 3 is that 9 parts of the phenylsilane-modified wear-resistant filler and 1 part of the alkylsilane-modified wear-resistant filler were used.

[0054] Comparative Example 1

[0055] S1, 20 parts of cubic boron nitride were dispersed in 200 parts of a mixed solution of ethanol and water (the mass ratio of ethanol to water in the mixed solution was 3:1), 1 part of phenyl triethoxysilane was added dropwise, and stirring was performed at 70°C for 12h, followed by filtration, washing, and drying to obtain a silane-modified wear-resistant filler;

[0056] S2, uniformly mix 100 parts of epoxy resin, 10 parts of silane-modified wear-resistant filler, 1 part of defoamer BYK-024, 3 parts of Digo 410 leveling agent, 3 parts of dicyandiamide, and 80 parts of anhydrous ethanol to obtain an insulating spray composite material for power transmission and transformation system.

[0057] The insulating spray composite material for power transmission and transformation system is sprayed on a metal sample plate, and cured at 150℃ for 30min to obtain a coating with a thickness of 1mm, and the performance test is as follows:

[0058] (1) Hardness: refer to the method in GB / T 6739-2022 to test the hardness;

[0059] (2) Wear resistance: refer to the method in GB / T 1768-2006 to test the mass loss;

[0060] (3) Hydrophobicity: the water contact angle analyzer is used to measure the water contact angle of water droplets on the surface of the coating, three points of each sample are tested, and the average value is taken as the final result;

[0061] (4) Insulation: refer to the method in GB / T 1408.1-2016 to test the electrical strength;

[0062] (5) Adhesion: refer to the method in GB / T 1720-2020 to test the adhesion;

[0063] The test results are recorded in Table 1 and Table 2.

[0064] Table 1 Test results of hardness and wear resistance of insulating spray composite material for power transmission and transformation system

[0065]

[0066] From Table 1, it can be seen that the hardness of the insulating spray composite material for power transmission and transformation system obtained by Examples 1-7 is higher than that of Comparative Example 1, and the mass loss is lower than that of Comparative Example 1, which shows that the cubic boron nitride is first compounded with alumina and then modified by silane, which can improve the wear resistance and hardness of the epoxy resin composite material using boron nitride as wear-resistant filler.

[0067] Table 2 Test results of hydrophobicity, insulation and adhesion of insulating spray composite material for power transmission and transformation system

[0068]

[0069] From Table 2, it can be seen that the water contact angle of the insulating spray composite material for power transmission and transformation system obtained by Examples 1-2 is above 138°, the electrical strength is above 25kV / mm, and the adhesion reaches level 1, which shows that the insulating spray composite material for power transmission and transformation system provided by the application has good hydrophobicity, insulation and adhesion.

[0070] The above merely provides the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall fall into the protection scope of the present application.

Claims

1. An insulating spray composite material for power transmission and distribution systems, characterized by, The raw materials include the following quality parts: epoxy resin 100 parts, silane modified wear-resistant filler 10-20 parts, defoaming agent 0-3 parts, leveling agent 0-10 parts, pigment 0-5 parts, curing agent 3-6 parts, solvent 80-120 parts; the wear-resistant filler in the silane modified wear-resistant filler is alumina composite cubic boron nitride; the raw materials of the alumina composite cubic boron nitride include alumina and cubic boron nitride with a mass ratio of 1-5:100; the particle size of the alumina is 10-200 nm; the particle size of the cubic boron nitride is 1-15 mu m; the silane modified wear-resistant filler includes phenylsilane modified wear-resistant filler and alkylsilane modified wear-resistant filler, and the mass of the phenylsilane modified wear-resistant filler is greater than that of the alkylsilane modified wear-resistant filler.

2. An insulating spray composite material for a power transmission and distribution system according to claim 1, characterized in that, The alumina composite cubic boron nitride is prepared by the following method: mixing alumina and cubic boron nitride and then ball milling to obtain the alumina composite cubic boron nitride.

3. An insulating spray composite material for power transmission and distribution systems according to claim 2, characterized in that, The rotation speed of the ball milling is 500-1000 rpm, and the ball milling time is 2-5 h.

4. The insulating spray composite material for power transmission and distribution system according to claim 1, wherein The mass ratio of the phenylsilane modified wear-resistant filler and the alkylsilane modified wear-resistant filler is 3:2-7:

3.

5. The insulating spray composite material for power transmission and distribution system according to claim 1, wherein The raw materials of the silane modified wear-resistant filler include silane and wear-resistant filler with a mass ratio of 1-3:

20.

6. A method for producing an insulating spray composite material for a power transmission and distribution system, for producing the insulating spray composite material for a power transmission and distribution system according to any one of claims 1 to 5, characterized by, The raw materials are mixed uniformly to obtain an insulating spray composite material for power transmission and transformation systems.

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