Photocatalytic anti-pollution flashover silicone rubber coating and preparation method thereof

Abstract

The invention discloses a photocatalytic anti-pollution flashover silicone rubber coating and a preparation method thereof, and belongs to the field of coatings. The coating comprises the following components in parts by mass: 80-100 parts of silicone oil, 240-390 parts of a modified filler, 100-300 parts of a solvent, 0.5-2 parts of a coupling agent B and 0.2-0.5 part of a photocatalyst, the modified filler is prepared by modifying an inorganic filler with a structure control agent and a coupling agent A, and the mass ratio of the structure control agent to the coupling agent B to the inorganic filler is 1: 0.01-0.02: 1. The inorganic filler comprises a heat-conducting inorganic filler and a reinforcing inorganic filler. The photocatalyst and the modified filler are added into the anti-pollution flashover silicone rubber coating, so that the prepared coating has relatively high heat-conducting property while keeping relatively high mechanical property, and can be quickly photo-cured under an ultraviolet condition; the coating is low in cost, easy to construct, not easy to age and long in service life.

Description

Technical Field

[0001] The invention relates to the field of coatings, and in particular to a photocatalytic anti-fouling flashover silicone rubber coating and a preparation method thereof. Background Art

[0002] At present, the insulator materials used in the power transmission and transformation equipment of the power system are basically glass or ceramic. Pollutant particles in the atmosphere are very easy to deposit on the surface of ceramic and glass to form a pollution layer. At the same time, humid atmosphere such as fog, rain and snow will form a water film on the surface of glass or ceramic insulators and dissolve the salt substances in the sediment, which will lead to uncontrolled local leakage and discharge, causing transmission losses. When the leakage current amplitude increases, the local arc increases, and the arc length reaches the critical value, flashover will occur on the surface of the insulator. This flashover will cause uninterrupted power transmission interruption, causing great economic losses and bringing certain safety hazards. In order to solve this problem, the commonly used method is to coat a layer of silicone RTV anti-pollution flashover coating on the surface of the substation equipment. This coating can give the surface of the substation equipment great hydrophobicity. Even if the surface is covered with deposited solid particles, it can still maintain hydrophobicity, thereby reducing the surface leakage caused by pollution flashover and increasing the flashover voltage.

[0003] However, existing anti-fouling flashover coatings still have the disadvantages of slow curing speed and difficulty in rapid molding, which makes them particularly inconvenient in emergency situations or where rapid construction is required; and there are also technical problems such as low thermal conductivity and low mechanical strength. Summary of the invention

[0004] Purpose of the invention: The first purpose of the present invention is to provide a photocatalytic anti-fouling flashover silicone rubber coating with excellent thermal conductivity and mechanical properties and fast curing speed. The second purpose of the present invention is to provide a method for preparing the above-mentioned anti-fouling flashover silicone rubber coating.

[0005] Technical solution: The photocatalytic anti-fouling silicone rubber coating of the present invention comprises the following components in parts by mass: 80-100 parts of silicone oil, 240-390 parts of modified filler, 100-300 parts of solvent, 0.5-2 parts of coupling agent A, and 0.2-0.5 parts of photocatalyst, wherein the modified filler is prepared by modifying the inorganic filler with a structure control agent and a coupling agent B, and the mass ratio of the structure control agent, the coupling agent B, and the inorganic filler is 1:0.01-0.02:1.

[0006] Furthermore, the modification treatment conditions are: treatment at 35-45°C for 1-2h.

[0007] Furthermore, the inorganic filler includes thermally conductive inorganic filler, reinforcing inorganic filler and other functional fillers.

[0008] Preferably, the thermally conductive inorganic filler includes silicon carbide, zinc oxide, aluminum nitride, boron nitride, and silicon carbide; the reinforcing inorganic filler includes hydrophobic silica, white carbon black, calcium carbonate, and aluminum oxide; and other functional fillers include nano titanium dioxide, aluminum hydroxide, iron hydroxide, plaster of Paris, clay, silicon micropowder, and asbestos wool.

[0009] Furthermore, the photocatalyst is a platinum catalyst.

[0010] Preferably, the platinum catalyst is selected from at least one of acetylacetonate platinum (II), trimethylmethylcyclopentadiene platinum (IV), cis-dichlorobis(triphenylphosphine)platinum (II), cis-dichlorotri(butylphosphine platinum) (II), and cis-dichlorobis(dimethylphenylphosphine)platinum (II).

[0011] More preferably, the photocatalyst is trimethyl methylcyclopentadienyl platinum (IV).

[0012] Furthermore, the silicone oil is one or more of vinyl-terminated polydimethylsiloxane, vinyl-terminated polymethylvinylsiloxane, and hydrogen-containing silicone oil, preferably a combination of vinyl-terminated polydimethylsiloxane and hydrogen-containing silicone oil.

[0013] Furthermore, the solvent is one or more of tetrachloroethylene, toluene, gasoline, turpentine, acetone, and ethyl acetate, preferably 120 gasoline.

[0014] Furthermore, the coupling agent A and the coupling agent B are one or more of γ-aminopropyltriethoxysilane, γ-glycidyloxypropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, and N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, and the coupling agent B is preferably a combination of γ-glycidyloxypropyltrimethoxysilane and γ-aminopropyltriethoxysilane, with a mass ratio of 1:1.

[0015] Furthermore, the structure control agent is one or more of hexamethyldisilazane, hydroxy silicone oil, diphenylsilanediol, and cyclic trisilazane, preferably hexamethyldisilazane.

[0016] The preparation method of the above-mentioned photocatalytic anti-fouling flash silicone rubber coating includes the following steps: stirring and mixing silicone oil and modified filler, adding solvent, stirring, adding coupling agent A, adding photocatalyst after mixing, continuing to stir to obtain composite glue, and filtering to obtain photocatalytic anti-fouling flash silicone rubber coating.

[0017] Principle of the invention: In the present invention, the molecules of the coupling agent and the structure control agent contain two groups with different chemical properties, one is an inorganic-philic group that is easy to react chemically with the surface of inorganic substances (inorganic powder); the other is an organic-philic group (polymer matrix) that can react chemically with synthetic resins or other polymers or generate hydrogen bonds and dissolve in them. Therefore, the coupling agent is called a "molecular bridge" to improve the interface between inorganic and organic substances and improve performance.

[0018] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: By adding photocatalysts and modified fillers to the anti-fouling silicone rubber coating, the coating prepared by the present invention has high thermal conductivity while maintaining high mechanical properties, and can be quickly photocured under ultraviolet conditions; it is low in cost, easy to construct, not prone to aging, and has a long service life. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with specific embodiments.

[0020] Example 1: The components of the photocatalytic anti-fouling silicone rubber coating provided in this example are shown in Table 1 below.

[0021] Table 1 Component contents of the photocatalytic anti-pollution flashover silicone rubber coating in Example 1

[0022]

[0023]

[0024] The preparation steps of the above-mentioned photocatalytic anti-fouling silicone rubber coating are as follows:

[0025] (1) Taking 50 parts by mass of hydrogenated silicone oil, adding 50 parts of vinyl-terminated polydimethylsiloxane, and stirring to obtain silicone oil;

[0026] (2) 120 parts of a structure control agent, 1.2 parts of a coupling agent and 120 parts of an inorganic filler were mixed and stirred, and placed in an oven at 40° C. for 2 hours to fully modify the inorganic filler, thereby obtaining a modified filler;

[0027] (3) Mix and stir the silicone oil obtained in step (1) and the modified filler obtained in step (2), then add 220 parts of solvent, stir, then add 1.2 parts of coupling agent A, and finally add 0.2 parts of photocatalyst, stir for 3-5 minutes to obtain a composite glue, and finally filter to obtain a photocatalytic anti-fouling silicone rubber coating.

[0028] Example 2: The components of the photocatalytic anti-fouling silicone rubber coating provided in this example are shown in Table 2 below.

[0029] Table 2 Component contents of the photocatalytic anti-pollution flashover silicone rubber coating in Example 2

[0030]

[0031] The preparation method of the above-mentioned photocatalyst anti-fouling silicone rubber coating is the same as that of Example 1.

[0032] Example 3: The components of the photocatalytic anti-fouling silicone rubber coating provided in this example are shown in Table 3 below.

[0033] Table 3 Component contents of the photocatalytic anti-pollution flashover silicone rubber coating in Example 3

[0034]

[0035] The preparation method of the above-mentioned photocatalyst anti-fouling silicone rubber coating is the same as that of Example 1.

[0036] Example 4: The components of the photocatalytic anti-fouling silicone rubber coating provided in this example are shown in Table 4 below.

[0037] Table 4 Component contents of the photocatalytic anti-fouling flashover silicone rubber coating in Example 4

[0038]

[0039] The preparation method of the above-mentioned photocatalyst anti-fouling silicone rubber coating is the same as that of Example 1.

[0040] Example 5: The components of the photocatalytic anti-fouling silicone rubber coating provided in this example are shown in Table 5 below.

[0041] Table 5 Component contents of the photocatalytic anti-fouling flashover silicone rubber coating in Example 5

[0042]

[0043] The preparation method of the above-mentioned photocatalyst anti-fouling silicone rubber coating is the same as that of Example 1.

[0044] Comparative Example 1: The components of the coating provided in this comparative example are shown in Table 6 below.

[0045] Table 6 Component content of the coating in Comparative Example 1

[0046]

[0047] The preparation method of the above coating is the same as that of Example 1.

[0048] Comparative Example 2: The components of the coating provided in this comparative example are shown in Table 7 below.

[0049] Table 7 Component content of the coating in Comparative Example 2

[0050]

[0051]

[0052] The preparation method of the above coating is the same as that of Example 1.

[0053] Comparative Example 3: The formula is the same as that of Example 1, and the preparation steps are as follows:

[0054] The silicone oil, inorganic filler, structure control agent, coupling agent A, coupling agent B, photocatalyst and solvent are directly mixed and stirred to obtain a composite glue, and finally filtered to obtain the anti-fouling flashover coating.

[0055] Comparative Example 4: The difference from Example 5 is that no photocatalyst is added.

[0056] The coatings prepared in Examples 1 to 5 and Comparative Examples 1 to 2 were subjected to performance tests. The results are shown in Table 8 below.

[0057] Table 8 Experimental data of coatings in Example 1-Example 5 and Comparative Example 1-Comparative Example 2

[0058]

[0059] It can be seen from Table 8 that compared with Examples 1 to 5, Comparative Example 1 uses conventional reinforcing fillers and does not improve thermal conductivity; the inorganic filler in Comparative Example 2 has not been modified, resulting in its mechanical properties being often weak and unable to meet the requirements of power materials. In Comparative Example 3, all raw materials are directly mixed, resulting in the coating thermal conductivity not reaching the ideal effect. In Comparative Example 4, no photocatalyst is used, resulting in a very slow curing reaction, which does not meet the requirements for increasing the curing rate at room temperature. The anti-fouling flashover silicone rubber coating prepared in Examples 1 to 5 adds a photocatalyst and modified fillers to make the coating have a curing time between 18-22s, a tensile strength of 2.45-3.14Mpa, an elongation at break of 198-215%, and a thermal conductivity of 0.73-1.11W / m·K. Compared with the comparative example, it has a fast curing speed, strong mechanical properties, and good thermal conductivity.

Claims

1. A photocatalytic anti-fouling silicone rubber coating, characterized in that: The invention comprises the following components in parts by mass: 80-100 parts of silicone oil, 240-390 parts of modified filler, 100-300 parts of solvent, 0.5-2 parts of coupling agent A and 0.2-0.5 parts of photocatalyst, wherein the modified filler is prepared by modifying the inorganic filler with a structure control agent and a coupling agent B, and the mass ratio of the structure control agent, the coupling agent B and the inorganic filler is 1:0.01-0.02:

1.

2. The anti-fouling flashover silicone rubber coating according to claim 1, characterized in that: The modification treatment conditions are: treatment at 35-45°C for 1-2h.

3. The anti-fouling flashover silicone rubber coating according to claim 1, characterized in that: The inorganic filler includes thermal conductive inorganic filler, reinforcing inorganic filler and other functional fillers.

4. The anti-fouling flashover silicone rubber coating according to claim 1, characterized in that: The photocatalyst is a platinum catalyst.

5. The anti-fouling flashover silicone rubber coating according to claim 4, characterized in that: The platinum catalyst is selected from at least one of acetylacetonate platinum (II), trimethylmethylcyclopentadiene platinum (IV), cis-dichlorobis(triphenylphosphine)platinum (II), cis-dichlorotri(butylphosphine platinum) (II), and cis-dichlorobis(dimethylphenylphosphine)platinum (II).

6. The anti-fouling flashover silicone rubber coating according to claim 1, characterized in that: The silicone oil is one or more of vinyl-terminated polydimethylsiloxane, vinyl-terminated polymethylvinylsiloxane, and hydrogen-containing silicone oil.

7. The anti-fouling flashover silicone rubber coating according to claim 1, characterized in that: The solvent is one or more of tetrachloroethylene, toluene, gasoline, turpentine, acetone and ethyl acetate.

8. The anti-fouling flashover silicone rubber coating according to claim 1, characterized in that: The coupling agent A and the coupling agent B are one or more of γ-aminopropyltriethoxysilane, γ-glycidyloxypropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, and N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane.

9. The anti-fouling flashover silicone rubber coating according to claim 1, characterized in that: The structure control agent is one or more of hexamethyldisilazane, hydroxy silicone oil, diphenylsilanediol, and cyclic trisilazane.

10. A method for preparing the photocatalytic anti-fouling silicone rubber coating according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: mixing silicone oil and modified filler, adding solvent, stirring, adding coupling agent A, adding photocatalyst after mixing, continuing stirring to obtain composite glue, and filtering to obtain photocatalytic anti-fouling silicone rubber coating.

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