Insulating covering paint as well as preparation method and application thereof

Abstract

The invention relates to an insulating covering coating as well as a preparation method and application thereof. The insulating covering paint comprises the following components in percentage by weight: 60%-65% of a water-based single-component epoxy resin emulsion, 0.05%-0.1% of a neutralizing agent, 0.5%-1.0% of a dispersing agent, 0.1%-0.2% of a defoaming agent, 8%-16.7% of deionized water, 0.8%-1.0% of a thickening agent, 1.0%-1.5% of a flash rust inhibitor, 8%-10% of pigment and 4%-6% of an anti-rust material, 0.2%-0.5% of a base material wetting agent, 2.0%-3.0% of a water repellent agent and 2.5%-3% of a coalescing agent. The water-based single-component epoxy resin emulsion and the water repellent agent used in the insulating covering paint can effectively enhance the electrical performance of a paint film in the product. The water-based single-component epoxy resin emulsion can enhance the surface dryness of a paint film. The addition of the antirust material can prevent the reduction of the heat resistance grade of the system.

Description

Technical Field

[0001] The present application belongs to the field of coatings, and specifically relates to an insulating covering coating, a preparation method thereof, and an application thereof. Background Art

[0002] Insulation coating paint is used to coat coils and insulating parts that have been impregnated to form an insulating protective layer of uniform thickness on their surface to prevent mechanical damage to the equipment insulation and erosion by the atmosphere and chemicals, and to improve the surface insulation strength. It is mainly used in generator manufacturing plants, thermal power plants or power stations. Therefore, the insulation coating paint is required to have the characteristics of fast drying, strong adhesion, hard paint film, high mechanical strength, heat resistance, insulation, and corrosion resistance. The construction methods include using a brush or a brush roller, and spraying with compressed air and a spray gun. The existing paint is mainly solvent-based, and it is necessary to solve the problem of high VOC content in paint, serious pollution, and fire hazards caused by coating in power stations. The existing water-based paint film is generally inferior to the solvent-based one in harsh environments; a paint must meet multiple construction methods; the hydrophilicity of the water-based paint needs to solve the electrical properties of the insulating paint after immersion in water; the heat resistance of the water-based paint. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present application provides an insulating covering coating, a preparation method thereof and its application. The water-based single-component epoxy resin emulsion and hydrophobic agent used in the insulating covering coating of the present application can effectively enhance the electrical properties of the paint film in the product. The water-based single-component epoxy resin emulsion can enhance the surface drying of the paint film. The addition of rust-proof materials will prevent the reduction of the heat resistance level of the system. The hydrophobic agent is used in the present application to make the coating have a binary micro-nano composite rough structure, so that the actual movement path of the electrons that generate surface conductive current on the coating surface increases, and in the same environment, the hydrophobic surface has low wettability, and the moisture content adsorbed is much lower than the moisture adsorbed by the ordinary surface. Most of the coating is still in a dry state, which is conducive to the improvement of the surface resistivity and the insulation of the coating.

[0004] In one aspect, the present application provides an insulating covering coating, comprising the following components by weight percentage: 60%-65% of an aqueous one-component epoxy resin emulsion, 0.05%-0.1% of a neutralizer, 0.5%-1.0% of a dispersant, 0.1%-0.2% of a defoaming agent, 8%-16.7% of deionized water, 0.8%-1.0% of a thickener, 1.0%-1.5% of an anti-flash rust agent, 8%-10% of a pigment, 4%-6% of an anti-rust material, 0.2%-0.5% of a substrate wetting agent, 2.0%-3.0% of a hydrophobic agent, and 2.5%-3% of a film-forming aid.

[0005] In the embodiment of the present application, the water-based one-component epoxy resin emulsion is an epoxy resin dispersion, optionally selected from any one of DIC 502-42W and DIC water-based one-component epoxy emulsion WE 511.

[0006] In an embodiment of the present application, the neutralizing agent is a multifunctional amine auxiliary, optionally selected from any one of AMP-95 and dimethylethanolamine; and / or

[0007] The dispersant is a high molecular weight block copolymer emulsion containing pigment affinity groups and does not contain VOCs, and is optionally selected from any one of BYK-190, TEGO755W and TEGO760W; and / or

[0008] The defoaming agent is modified silicone or polyglycol, and is optionally selected from any one of Hemmings DF696, BYK028 and BYK024.

[0009] In an embodiment of the present application, the thickener is a liquid associative rheological additive, optionally selected from any one of Hemmings R-299, OMG 0620 and Dow Chemical RM-8W; and / or

[0010] The flash rust preventer is a mixed solution of inorganic acid and amine and does not contain VOC substances, and is optionally selected from any one of Ascotec H14, Beijing Zhitu Chemical ZT-708 and ZT707; and / or

[0011] The pigment is any one or more of rutile titanium dioxide, phthalocyanine blue, phthalocyanine green and red iron oxide.

[0012] In an embodiment of the present application, the rust-proof material is a zinc phosphate / molybdate composite pigment, optionally selected from any one of Nubilai 106 and Nubilai 302.

[0013] In an embodiment of the present application, the substrate wetting agent is an organosiloxane copolymer, optionally selected from any one of Hangzhou Chongyao SL-5100 and TEGO4100; and / or

[0014] The film-forming aid is any one of industrial grade alcohol ester dodecanedione, dipropylene glycol butyl ether and dipropylene glycol methyl ether.

[0015] In an embodiment of the present application, the hydrophobic agent is a fluorine hydrophobic agent, optionally selected from any one of Junchengmei HF320, Dow Corning 6683 and Dow hydrophobic agent DOWSIL 54 Additive.

[0016] In an embodiment of the present application, the particle size of the rust-proof material is 50-100 μm.

[0017] In another aspect, the present application provides a method for preparing the above-mentioned insulating covering coating, comprising the following steps:

[0018] (1) First, 8%-16.7% of deionized water is stirred, and at 400-600 r / min, 0.05%-0.1% of a neutralizer, 0.5%-1.0% of a dispersant, and 0.1%-0.2% of a defoamer are gradually added, and stirred for 5-8 minutes. At 500-700 r / min, 8%-10% of a pigment and 4%-6% of a rust preventive are added, and stirred at 700-800 r / min for 5-8 minutes. Finally, 2%-3% of a hydrophobic agent is added, and stirred at 800-1000 r / min for 10-15 minutes, and ground to a fineness of ≤15 μm to obtain the first part;

[0019] (2) adding 60%-65% of the aqueous one-component epoxy resin emulsion into another preparation pot, stirring evenly at 500-600 r / min, gradually adding 2.5%-3% of the film-forming aid, 1%-1.5% of the flash rust inhibitor, and 0.2%-0.5% of the substrate wetting agent, stirring for 10-15 minutes, and obtaining the second part;

[0020] (3) Slowly add the first part into the second part, stir at 1000-1200 r / min for 5-8 min, and then add 0.8%-1.0% of thickener to adjust the viscosity to 70-75 KU (25±1° C.).

[0021] In yet another aspect, the present application provides use of the above-mentioned insulating covering coating or the insulating covering coating prepared according to the above-mentioned method as a protective coating for coils and insulating parts that have been impregnated.

[0022] Beneficial technical effects of this application:

[0023] 1. The water-based one-component epoxy resin emulsion used in this application is a modified polymer type with fast drying speed, high mechanical strength and a hardness of up to H.

[0024] 2. A hydrophobic agent is used in this application to give the coating a binary micro-nano composite rough structure, which increases the actual movement path of electrons that generate surface conductivity current on the coating surface. In addition, in the same environment, the hydrophobic surface has low wettability, and the moisture content adsorbed is much lower than that adsorbed by an ordinary surface. Most of the coating is still in a dry state, which is conducive to improving the surface resistivity and improving the insulation of the coating.

[0025] 3. The rust-proof material used in this application is a zinc phosphate / molybdate composite pigment with a small particle size, which is surface treated to increase compatibility with red iron oxide and enhance the anti-corrosion ability in a thin layer of anti-corrosion coating. In addition, the addition of rust-proof material will prevent the system from reducing its heat resistance level.

[0026] 4. The water-based one-component epoxy resin emulsion, pigment, and rust-proof material used in this application can have a heat resistance grade of up to Class C.

[0027] 5. The water-based system used in this application is non-flammable and non-explosive, VOC≤50g / L, has very low odor, reduces environmental pollution, and is easy to construct.

[0028] 6. Electrical properties (thin layer): Normal state ≥80MV / m, after immersion in water ≥10MV / m, the paint film does not separate, bubble or soften after immersion in water.

[0029] 7. The surface drying time can reach 0.3h according to GB / T1981.2-2009 sequence 6.4.1, and the paint film is non-sticky.

[0030] 8. The coating of this application has excellent coverage and meets the spraying, brushing and roller coating processes, without dew points, bubbles, sagging and other defects that affect the appearance.

[0031] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by implementing the present application. Other advantages of the present application can be realized and obtained by the schemes described in the description. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present application more clear, the embodiments of the present application will be described in detail below. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0033] An embodiment of the present application provides an insulating covering coating, comprising the following components in weight percentage: 60%-65% of an aqueous one-component epoxy resin emulsion, 0.05%-0.1% of a neutralizer, 0.5%-1.0% of a dispersant, 0.1%-0.2% of a defoaming agent, 8%-16.7% of deionized water, 0.8%-1.0% of a thickener, 1.0%-1.5% of an anti-flash rust agent, 8%-10% of a pigment, 4%-6% of an anti-rust material, 0.2%-0.5% of a substrate wetting agent, 2.0%-3.0% of a hydrophobic agent, and 2.5%-3% of a film-forming aid.

[0034] In the embodiments of the present application, the water-based one-component epoxy resin emulsion is an epoxy resin dispersion, and is optionally selected from any one of DIC 502-42W and DIC water-based one-component epoxy emulsion WE 511.

[0035] In an embodiment of the present application, the neutralizing agent is a multifunctional amine auxiliary, optionally selected from any one of AMP-95 and dimethylethanolamine; and / or

[0036] The dispersant is a high molecular weight block copolymer emulsion containing pigment affinity groups and does not contain VOCs, and is optionally selected from any one of BYK-190, TEGO755W and TEGO760W; and / or

[0037] The defoaming agent is modified silicone or polyglycol, and is optionally selected from any one of Hemmings DF696, BYK028 and BYK024.

[0038] In an embodiment of the present application, the thickener is a liquid associative rheological additive, optionally selected from any one of Hemmings R-299, OMG 0620 and Dow Chemical RM-8W; and / or

[0039] The flash rust preventer is a mixed solution of inorganic acid and amine and does not contain VOC substances, and is optionally selected from any one of Ascotec H14, Beijing Zhitu Chemical ZT-708 and ZT707; and / or

[0040] The pigment is any one or more of rutile titanium dioxide, phthalocyanine blue, phthalocyanine green and red iron oxide.

[0041] In an embodiment of the present application, the rust-proof material is a zinc phosphate / molybdate composite pigment, optionally selected from any one of Nubilai 106 and Nubilai 302.

[0042] In an embodiment of the present application, the substrate wetting agent is an organic siloxane copolymer, optionally selected from any one of Hangzhou Chongyao SL-5100 and TEGO4100; and / or

[0043] The film-forming aid is any one of industrial grade alcohol ester dodecanedione, dipropylene glycol butyl ether and dipropylene glycol methyl ether.

[0044] In an embodiment of the present application, the hydrophobic agent is a fluorine hydrophobic agent, optionally selected from any one of Junchengmei HF320, Dow Corning 6683 and DOW hydrophobic agent DOWSIL 54 Additive.

[0045] In an embodiment of the present application, the particle size of the rust-proof material is 50-100 μm.

[0046] The present invention provides a method for preparing the above-mentioned insulating coating, comprising the following steps:

[0047] (1) First, 8%-16.7% of deionized water is stirred, and at 400-600 r / min, 0.05%-0.1% of a neutralizer, 0.5%-1.0% of a dispersant, and 0.1%-0.2% of a defoamer are gradually added, and stirred for 5-8 minutes. At 500-700 r / min, 8%-10% of a pigment and 4%-6% of a rust preventive are added, and stirred at 700-800 r / min for 5-8 minutes. Finally, 2%-3% of a hydrophobic agent is added, and stirred at 800-1000 r / min for 10-15 minutes, and ground to a fineness of ≤15 μm to obtain the first part;

[0048] (2) adding 60%-65% of the aqueous one-component epoxy resin emulsion into another preparation pot, stirring evenly at 500-600 r / min, gradually adding 2.5%-3% of the film-forming aid, 1%-1.5% of the flash rust inhibitor, and 0.2%-0.5% of the substrate wetting agent, stirring for 10-15 minutes, and obtaining the second part;

[0049] (3) Slowly add the first part into the second part, stir at 1000-1200 r / min for 5-8 min, and then add 0.8%-1.0% of thickener to adjust the viscosity to 70-75 KU (25±1° C.).

[0050] The embodiments of the present application provide the use of the above-mentioned insulating covering coating or the insulating covering coating prepared according to the above-mentioned method as a protective coating for coils and insulating parts that have been impregnated.

[0051] Sources of materials for embodiments and comparative examples:

[0052] The water-based one-component epoxy resin emulsion is DIC 502-42W;

[0053] The neutralizing agent is AMP-95;

[0054] The dispersant is BYK-190 from BYK Chemicals;

[0055] The defoamer is Hemmings DF696;

[0056] The thickener is Hemmings R-299;

[0057] The anti-flash rust agent is Ascotec H14;

[0058] The pigment is rutile titanium dioxide;

[0059] The anti-rust material is Nubilai 106;

[0060] The substrate wetting agent is Hangzhou Chongyao SL-5100;

[0061] The hydrophobic agent is Junchengmei HF320;

[0062] The film-forming aid is dipropylene glycol butyl ether.

[0063] Example 1

[0064] The present embodiment provides an insulating covering coating, comprising the following components in weight percentage: 60% of an aqueous one-component epoxy resin emulsion, 0.05% of a neutralizer, 0.5% of a dispersant, 0.1% of a defoaming agent, 16.35% of deionized water, 0.8% of a thickener, 1.5% of an anti-flash rust agent, 10% of a pigment, 6% of an anti-rust material, 0.2% of a substrate wetting agent, 2% of a hydrophobic agent, and 2.5% of a film-forming aid.

[0065] This embodiment provides a method for preparing the above-mentioned insulating covering coating, comprising the following steps:

[0066] (1) First, 16.35% of deionized water was stirred, and 0.05% of a neutralizer, 0.5% of a dispersant, and 0.1% of a defoamer were gradually added at 400 r / min, and stirred for 5 min. Then, 10% of a pigment and 6% of a rust preventive were added at 500 r / min, and stirred at 700 r / min for 8 min. Finally, 2% of a hydrophobic agent was added, and stirred at 800 r / min for 10 min. The mixture was ground to a fineness of ≤15 μm to obtain the first part;

[0067] (2) Add 60% of the aqueous one-component epoxy resin emulsion to another preparation pot, stir evenly at 500 r / min, gradually add 2.5% of the film-forming aid, 1.5% of the flash rust inhibitor, and 0.2% of the substrate wetting agent, stir for 10 minutes, and obtain the second part;

[0068] (3) The first part was slowly added to the second part, stirred at 1000 r / min for 5 min, and then 0.8% of thickener was added to adjust the viscosity to 70-75 KU (25±1° C.) (KU viscometer).

[0069] Embodiment 2-4

[0070] Example 2-4 provides an insulating covering coating, the components of which are shown in Table 1. In addition, the insulating covering coatings of Example 2-4 were prepared according to the method of Example 1.

[0071] Comparative Examples 1-4

[0072] Comparative Examples 1-4 provide a coating, the components of which are shown in Table 1. In addition, the coatings of Comparative Examples 1-4 were prepared according to the method of Example 1.

[0073] Table 1

[0074]

[0075] Performance Testing

[0076] The coatings prepared in Examples 1-4 and Comparative Examples 1-4 were applied to the coils of the motors and the performance tests were performed. The results are shown in Table 2 below.

[0077] Table 2

[0078]

[0079] The results in Table 2 show that the use of water-based one-component epoxy resin emulsion and hydrophobic agent in the coating can effectively enhance the electrical properties of the paint film. The use of solvent-based resin emulsion in the coating causes the VOC in the system to exceed the standard seriously and the surface dryness decreases. The use of rust-proof material in the coating can prevent the heat resistance level of the system from decreasing.

[0080] Although the embodiments disclosed in this application are as above, the contents described are only embodiments adopted to facilitate understanding of this application and are not intended to limit this application. Any technician in the field to which this application belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in this application, but the scope of patent protection of this application shall still be based on the scope defined in the attached claims.

Claims

1. An insulating covering coating, comprising the following components by weight percentage: 60%-65% of an aqueous one-component epoxy resin emulsion, 0.05%-0.1% of a neutralizer, 0.5%-1.0% of a dispersant, 0.1%-0.2% of a defoamer, 8%-16.7% of deionized water, 0.8%-1.0% of a thickener, 1.0%-1.5% of an anti-flash rust agent, 8%-10% of a pigment, 4%-6% of an anti-rust material, 0.2%-0.5% of a substrate wetting agent, 2.0%-3.0% of a hydrophobic agent, and 2.5%-3% of a film-forming aid.

2. The insulating coating material according to claim 1, wherein: The water-based one-component epoxy resin emulsion is an epoxy resin dispersion, and is optionally selected from any one of DIC 502-42W and DIC water-based one-component epoxy emulsion WE 511.

3. The insulating covering coating according to claim 1, wherein: The neutralizing agent is a multifunctional amine auxiliary, optionally selected from any one of AMP-95 and dimethylethanolamine; and / or The dispersant is a high molecular weight block copolymer emulsion containing pigment affinity groups and does not contain VOCs, and is optionally selected from any one of BYK-190, TEGO755W and TEGO760W; and / or The defoaming agent is modified silicone or polyglycol, and is optionally selected from any one of Hemmings DF696, BYK028 and BYK024.

4. The insulating covering coating according to claim 1, wherein: The thickener is a liquid associative rheological additive, optionally selected from any one of Hemmings R-299, OMG 0620 and Dow Chemical RM-8W; and / or The flash rust preventer is a mixed solution of inorganic acid and amine and does not contain VOC substances, and is optionally selected from any one of Ascotec H14, Beijing Zhitu Chemical ZT-708 and ZT707; and / or The pigment is any one or more of rutile titanium dioxide, phthalocyanine blue, phthalocyanine green and red iron oxide.

5. The insulating covering coating according to claim 1, wherein: The rust-proof material is a zinc phosphate / molybdate composite pigment, optionally selected from any one of Nubilai 106 and Nubilai 302.

6. The insulating covering coating according to claim 1, wherein: The substrate wetting agent is an organosiloxane copolymer, optionally selected from any one of Hangzhou Chongyao SL-5100 and TEGO4100; and / or The film-forming aid is any one of industrial grade alcohol ester dodecanedione, dipropylene glycol butyl ether and dipropylene glycol methyl ether.

7. The insulating covering coating according to claim 1, wherein: The hydrophobic agent is a fluorine hydrophobic agent, optionally selected from any one of Junchengmei HF320, Dow Corning 6683 and DOW hydrophobic agent DOWSIL 54 Additive.

8. The insulating covering coating according to claim 1 or 5, wherein: The particle size of the rust-proof material is 50-100 μm.

9. A method for preparing the insulating covering coating according to any one of claims 1 to 8, comprising the following steps: (1) First, 8%-16.7% of deionized water is stirred, and at 400-600 r / min, 0.05%-0.1% of a neutralizer, 0.5%-1.0% of a dispersant, and 0.1%-0.2% of a defoamer are gradually added, and stirred for 5-8 minutes. At 500-700 r / min, 8%-10% of a pigment and 4%-6% of a rust preventive are added, and stirred at 700-800 r / min for 5-8 minutes. Finally, 2%-3% of a hydrophobic agent is added, and stirred at 800-1000 r / min for 10-15 minutes, and ground to a fineness of ≤15 μm to obtain the first part; (2) adding 60%-65% of the aqueous one-component epoxy resin emulsion into another preparation pot, stirring evenly at 500-600 r / min, gradually adding 2.5%-3% of the film-forming aid, 1%-1.5% of the flash rust inhibitor, and 0.2%-0.5% of the substrate wetting agent, stirring for 10-15 minutes, and obtaining the second part; (3) Slowly add the first part into the second part, stir at 1000-1200 r / min for 5-8 min, and then add 0.8%-1.0% of thickener to adjust the viscosity to 70-75 KU (25±1° C.).

10. Use of the insulating covering coating according to any one of claims 1 to 8 or the insulating covering coating prepared by the method according to claim 9 as a protective coating for dip-treated coils and insulating parts.

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