Anticorrosive coating, method for preparing the same and use thereof

Abstract

The application discloses an anticorrosive paint and a preparation method and application thereof, and belongs to the field of anticorrosive paint. The anticorrosive paint comprises the following components in parts by weight: 50-70 parts of epoxy resin, 25-45 parts of composite acid, 12-18 parts of nanocomposite, 4-6 parts of isocyanate, 8-12 parts of leveling agent, 8-12 parts of filler, 4-6 parts of antioxidant, 5-20 parts of pigment and 80-120 parts of diluent. The composite acid contains fumaric acid and p-hydroxybenzenesulfonic acid in a weight ratio of 1:(0.5-2.5). The nanocomposite contains nanometer boron nitride, nanometer silicon dioxide and nanometer zinc oxide. The composite acid composed of fumaric acid and p-hydroxybenzenesulfonic acid in a specific weight ratio can not only form a stable and dense network structure with epoxy resin and isocyanate in the system through hydrogen bonds and benzene rings, resist the penetration of corrosive substances and improve the corrosion resistance of the anticorrosive paint, but also improve the volume resistance of the anticorrosive paint, thereby improving the insulation of the anticorrosive paint.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and more specifically, to an anti-corrosion coating, its preparation method, and its application. Background Technology

[0002] As a crucial component of the power system, distribution boxes are widely used in industrial and civil buildings, undertaking the functions of power distribution and control. The outer casing of the distribution box acts as a barrier, isolating it from the external environment and protecting the internal components from external interference. Currently, the materials used for distribution box casings are mainly metals, alloys, plastics, and composite materials. Among these, metal or alloy casings are widely used due to their high mechanical strength and safety; however, their susceptibility to corrosion limits their service life. In particular, the constant exposure of distribution boxes to the outdoor environment makes metal or alloy casings susceptible to erosion from rain, ultraviolet radiation, and other climatic factors, leading to corrosion, rust, and aging. This not only reduces the lifespan of the distribution box but also increases maintenance costs, seriously affecting the reliability and security of power supply. Therefore, corrosion protection for distribution box casings is essential.

[0003] Applying or spraying anti-corrosion coatings to the outer casing of distribution boxes is an important measure for protecting them from corrosion. The anti-corrosion coatings used must not only have corrosion resistance but also insulation properties to prevent leakage, extend the service life of the distribution box, reduce maintenance costs, and ensure the reliability and safety of power supply.

[0004] Therefore, developing an anti-corrosion coating with high corrosion resistance and insulation properties is of significant economic value. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an anti-corrosion coating, its preparation method and application.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] In a first aspect, the present invention provides an anti-corrosion coating comprising the following components in parts by weight:

[0008] 50-70 parts epoxy resin, 25-45 parts composite acid, 12-18 parts nanocomposite, 4-6 parts isocyanate, 8-12 parts leveling agent, 8-12 parts filler, 4-6 parts antioxidant, 5-20 parts pigment, and 80-120 parts diluent.

[0009] The composite acid contains fumaric acid and p-hydroxybenzenesulfonic acid in a weight ratio of 1:(0.5-2.5);

[0010] The nanocomposite contains nano-boron nitride, nano-silica, and nano-zinc oxide.

[0011] In the anti-corrosion coating of the present invention, the composite acid composed of fumaric acid and p-hydroxybenzenesulfonic acid in a specific weight ratio can not only form a stable and dense network structure with epoxy resin, isocyanate and other substances in the system through hydrogen bonds, benzene rings and the like, which can resist the penetration of acidic and alkaline corrosive substances and improve the corrosion resistance of the anti-corrosion coating, but also improve the volume resistivity of the anti-corrosion coating, thereby improving the insulation of the anti-corrosion coating.

[0012] Preferably, the weight ratio of fumaric acid to p-hydroxybenzenesulfonic acid is 1:(1.0-2.0).

[0013] More preferably, the weight ratio of fumaric acid to p-hydroxybenzenesulfonic acid is 1:1.5.

[0014] Preferably, the weight ratio of the nano boron nitride, nano silicon dioxide, and nano zinc oxide is 1:(0.05-0.30):(0.10-0.90).

[0015] More preferably, the weight ratio of the nano boron nitride, nano silicon dioxide and nano zinc oxide is 1:(0.10-0.25):(0.25-0.80).

[0016] In the anti-corrosion coating of the present invention, a nanocomposite composed of nano-boron nitride, nano-silica and nano-zinc oxide in a specific weight ratio is uniformly distributed in a network structure formed by composite acid, epoxy resin, isocyanate, etc., to further improve the stability, density and strength of the network structure, thereby better resisting the penetration of acidic and alkaline corrosive substances, and better improving the volume resistivity of the anti-corrosion coating, thereby further improving the corrosion resistance and insulation of the anti-corrosion coating.

[0017] More preferably, the weight ratio of the nano boron nitride, nano silicon dioxide and nano zinc oxide is 1:0.17:0.5.

[0018] Preferably, the average particle size of the nano-boron nitride is 100-500 nm.

[0019] More preferably, the average particle size of the boron nitride nanoparticles is 200-400 nm.

[0020] Preferably, the average particle size of the nano-silica is 50-200 nm.

[0021] More preferably, the average particle size of the nano-silica is 80-120 nm.

[0022] Preferably, the average particle size of the nano zinc oxide is 40-150 nm.

[0023] More preferably, the average particle size of the nano zinc oxide is 40-60 nm.

[0024] Commonly used epoxy resins, isocyanates, leveling agents, fillers, antioxidants, pigments, and diluents in this field can all be used in this invention.

[0025] Preferably, the isocyanate is at least one of hexamethylene diisocyanate and isoflurane diisocyanate.

[0026] Preferably, the leveling agent is BYK-333.

[0027] Preferably, the filler is at least one of aluminum hydroxide, double-flying powder, mica powder, talc powder, and bentonite.

[0028] More preferably, the filler is aluminum hydroxide and double-flying powder in a weight ratio of 1:(3-6).

[0029] Preferably, the antioxidant is at least one of antioxidant 9614 and antioxidant 1010.

[0030] Preferably, the pigment is at least one of titanium dioxide, chrome yellow, molybdenum chrome red, and chrome green.

[0031] Preferably, the diluent is at least one selected from acetone, ethanol, ethyl acetate, and toluene.

[0032] Secondly, the present invention provides a method for preparing an anti-corrosion coating, comprising the following steps:

[0033] S1. Divide the diluent into 3 portions, namely Diluent I, Diluent II, and Diluent III, for later use;

[0034] S2. Add fumaric acid, epoxy resin, and nanocomposite to diluent I to obtain component I, for later use;

[0035] S3. Add p-hydroxybenzenesulfonic acid and isocyanate to diluent II to obtain component II, for later use;

[0036] S4. Add leveling agent, filler, antioxidant and pigment to diluent III to obtain component III, for later use;

[0037] S5. Heat component I, add component II and mix, cool down, then add component III to obtain the anti-corrosion coating.

[0038] In this invention, the weight parts of diluent I, diluent II, and diluent III may be the same or different.

[0039] Preferably, step S2 specifically involves: adding fumaric acid to diluent I, heating for the first time, adding epoxy resin, heating for the second time, and adding the nanocomposite to obtain component I, which is then ready for use.

[0040] More preferably, the temperature of the first heating is 30-40°C.

[0041] More preferably, the temperature of the second heating is 90-100°C.

[0042] Preferably, in step S5, the heating temperature is 70-80°C.

[0043] Preferably, in step S5, the cooling temperature is 40-50°C.

[0044] Thirdly, the present invention provides an application of an anti-corrosion coating in a distribution box.

[0045] Preferably, the anti-corrosion coating is applied to the surface of the distribution box housing.

[0046] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0047] In the anti-corrosion coating of the present invention, the composite acid composed of fumaric acid and p-hydroxybenzenesulfonic acid in a specific weight ratio can not only form a stable and dense network structure with epoxy resin, isocyanate and other substances in the system through hydrogen bonds, benzene rings and the like, which can resist the penetration of acidic and alkaline corrosive substances and improve the corrosion resistance of the anti-corrosion coating, but also improve the volume resistivity of the anti-corrosion coating, thereby improving the insulation of the anti-corrosion coating.

[0048] In the anti-corrosion coating of the present invention, a nanocomposite composed of nano-boron nitride, nano-silica and nano-zinc oxide in a specific weight ratio is uniformly distributed in a network structure formed by composite acid, epoxy resin, isocyanate, etc., to further improve the stability, density and strength of the network structure, thereby better resisting the penetration of acidic and alkaline corrosive substances, and better improving the volume resistivity of the anti-corrosion coating, thereby further improving the corrosion resistance and insulation of the anti-corrosion coating.

[0049] The anti-corrosion coating of this invention not only has corrosion resistance but also insulation properties, thus preventing leakage, extending the service life of the distribution box, reducing the maintenance cost of the distribution box, and ensuring the reliability and safety of power supply. Detailed Implementation

[0050] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0051] The experimental methods in the following examples, unless otherwise specified, are generally performed under conventional conditions in the art or as recommended by the manufacturer; the raw materials and reagents used, unless otherwise specified, are all commercially available from the conventional market.

[0052] The reagents used in the various embodiments and comparative examples of this invention are as follows:

[0053] Epoxy resin, WSR618(E51), Phoenix brand;

[0054] Nano boron nitride-1, average particle size 300nm, Brofos-BN-300, Bohuas Nanotechnology (Ningbo) Co., Ltd.;

[0055] Nano boron nitride-2, average particle size 400nm, Brofos-BN-400, Bohuas Nanotechnology (Ningbo) Co., Ltd.

[0056] Nano boron nitride-3, average particle size 200nm, Brofos-BN-200, Bohuas Nanotechnology (Ningbo) Co., Ltd.

[0057] Nano boron nitride-4, average particle size 100nm, Brofos-BN-100, Bohuas Nanotechnology (Ningbo) Co., Ltd.

[0058] Nano boron nitride-5, average particle size 500nm, Brofos-BN-500, Bohuas Nanotechnology (Ningbo) Co., Ltd.

[0059] Nano silica-1, average particle size 100nm, Brofos-SiO2-100, Bohuas Nanotechnology (Ningbo) Co., Ltd.

[0060] Nano zinc oxide-1, average particle size 50nm, Brofos-ZnO-50, Bohuas Nanotechnology (Ningbo) Co., Ltd.;

[0061] Nano zinc oxide-2, average particle size 150nm, Brofos-ZnO-150, Brofos Nanotechnology (Ningbo) Co., Ltd.

[0062] Leveling agent, BYK-333, BYK (Germany);

[0063] Antioxidant, Antioxidant 9614, CAS No.: 2408518-51-2, Qingdao Jiedejia New Material Technology Co., Ltd.;

[0064] Double-flying powder, 400 mesh, Jiangxi Xuerui Powder New Material Co., Ltd.;

[0065] Aluminum hydroxide, particle size 25μm, A110531, Shanghai Aladdin;

[0066] Titanium dioxide, R-248, Sichuan Panzhihua Iron & Steel Titanium Industry.

[0067] Example 1

[0068] This embodiment provides an anti-corrosion coating, comprising the following components in parts by weight:

[0069] 60 parts epoxy resin, 33 parts composite acid, 15 parts nanocomposite, 5 parts isocyanate (hexamethylene diisocyanate), 10 parts leveling agent, 10 parts filler, 5 parts antioxidant, 7 parts pigment titanium dioxide, and 100 parts diluent acetone.

[0070] The composite acid contains fumaric acid and p-hydroxybenzenesulfonic acid in a weight ratio of 1:1.5;

[0071] The nanocomposite contains nano-boron nitride-1, nano-silica-1 and nano-zinc oxide-1 in a weight ratio of 1:0.17:0.5;

[0072] The filler is aluminum hydroxide and double-flying powder in a weight ratio of 1:4;

[0073] The preparation method of the above-mentioned anti-corrosion coating includes the following steps:

[0074] S1. Divide the diluent acetone into three equal portions: diluent I, diluent II, and diluent III, for later use;

[0075] S2. Add fumaric acid to diluent I, heat to 35°C for the first time, then add epoxy resin, heat to 95°C for the second time, then add nanocomposite to obtain component I, for later use;

[0076] S3. Add p-hydroxybenzenesulfonic acid and isocyanate (hexamethylene diisocyanate) to diluent II to obtain component II, for later use;

[0077] S4. Add leveling agent, filler, antioxidant, and titanium dioxide pigment to diluent III to obtain component III, for later use;

[0078] S5. Heat component I to 75°C, add component II and mix, cool to 45°C, then add component III to obtain the anti-corrosion coating.

[0079] Examples 2-5 and Comparative Examples 1-3

[0080] Examples 2-5 and Comparative Examples 1-3 provide different anti-corrosion coatings. The difference between them and Example 1 lies in the weight ratio of fumaric acid and p-hydroxybenzenesulfonic acid in the composite acid. All other aspects are the same as in Example 1, as shown in the table below:

[0081] Table 1 shows the weight ratio of fumaric acid and p-hydroxybenzenesulfonic acid in Examples 1-5 and Comparative Examples 1-3.

[0082] The weight ratio of fumaric acid to p-hydroxybenzenesulfonic acid Example 1 1:1.5 Example 2 1:2.0 Example 3 1:1.0 Example 4 1:2.5 Example 5 1:0.5 Comparative Example 1 1:5 Comparative Example 2 1:0 Comparative Example 3 0:1

[0083] Comparative Example 4

[0084] This comparative example provides an anti-corrosion coating, which differs from Example 1 in that maleic acid is used instead of p-hydroxybenzenesulfonic acid, while the rest is the same as Example 1.

[0085] Examples 6-13 and Comparative Examples 5-7

[0086] Examples 6-13 and Comparative Examples 5-7 provide different anti-corrosion coatings. The difference between them and Example 1 lies in the weight ratio of nano-boron nitride-1, nano-silica-1, and nano-zinc oxide-1 in the nanocomposite. All other aspects are the same as in Example 1, as shown in the table below:

[0087] Table 2 shows the weight ratios of nano-boron nitride-1, nano-silica-1, and nano-zinc oxide-1 in Examples 1, 6-13, and Comparative Examples 5-7.

[0088]

[0089]

[0090] Examples 14-17

[0091] Examples 14-17 provide different anti-corrosion coatings, which differ from Example 1 in the type of nano boron nitride used; otherwise, they are identical to Example 1, as detailed in the table below:

[0092] Table 3. Types of nano-boron nitride in Examples 1, 14-17

[0093] Types of nano boron nitride Average particle size of boron nitride nanoparticles / nm Example 1 Nano boron nitride-1 300 Example 14 Nano boron nitride-2 400 Example 15 Nano boron nitride-3 200 Example 16 Nano boron nitride-4 100 Example 17 Nano boron nitride-5 500

[0094] Example 18

[0095] This embodiment provides an anti-corrosion coating, which differs from Embodiment 1 in that nano zinc oxide-2 (average particle size 150nm) is used instead of nano zinc oxide-1 (average particle size 50nm), while the rest is the same as Embodiment 1.

[0096] Example 19

[0097] This embodiment provides an anti-corrosion coating, comprising the following components in parts by weight:

[0098] 50 parts epoxy resin, 25 parts composite acid, 12 parts nanocomposite, 4 parts isocyanate (hexamethylene diisocyanate), 8 parts leveling agent, 8 parts filler, 4 parts antioxidant, 5 parts pigment titanium dioxide, and 80 parts diluent acetone.

[0099] The composite acid contains fumaric acid and p-hydroxybenzenesulfonic acid in a weight ratio of 1:0.7;

[0100] The nanocomposite contains nano-boron nitride-1, nano-silica-1 and nano-zinc oxide-1 in a weight ratio of 1:0.10:0.25;

[0101] The filler is aluminum hydroxide and double-flying powder in a weight ratio of 1:3;

[0102] The preparation method of the above-mentioned anti-corrosion coating is the same as that in Example 1.

[0103] Example 20

[0104] This embodiment provides an anti-corrosion coating, comprising the following components in parts by weight:

[0105] 70 parts epoxy resin, 45 parts composite acid, 18 parts nanocomposite, 6 parts isocyanate (hexamethylene diisocyanate), 14 parts leveling agent, 12 parts filler, 6 parts antioxidant, 20 parts pigment titanium dioxide, and 120 parts diluent acetone.

[0106] The composite acid contains fumaric acid and p-hydroxybenzenesulfonic acid in a weight ratio of 1:2.5;

[0107] The nanocomposite contains nano-boron nitride-1, nano-silica-1 and nano-zinc oxide-1 in a weight ratio of 1:0.25:0.80;

[0108] The filler is aluminum hydroxide and double-flying powder in a weight ratio of 1:6;

[0109] The preparation method of the above-mentioned anti-corrosion coating is the same as that in Example 1.

[0110] Performance testing

[0111] The performance of the anti-corrosion coatings in each embodiment and comparative example was tested, as follows:

[0112] (1) Sample preparation

[0113] The anti-corrosion coatings of each embodiment or comparative example were coated on a stainless steel plate and baked at 200°C for 10 min to obtain a coating sample with a length of 10 mm, a width of 30 mm, and a thickness of 100 μm.

[0114] (2) Tensile strength test

[0115] The coating sample prepared in (1) was subjected to stress-strain test using a CMT5305 universal testing machine. The strain rate was 10 mm / min. Tensile strength refers to the load per unit cross-sectional area when the coating sample is broken on the CMT5305 universal testing machine.

[0116] (3) Corrosion resistance test

[0117] In this invention, the corrosion resistance of the anti-corrosion coating is reflected by its resistance to acid corrosion and its resistance to alkali corrosion.

[0118] A. Acid resistance test

[0119] The coating sample prepared in (1) was immersed in 20L of 10% hydrochloric acid aqueous solution for 45 days. After taking it out, the surface condition of the coating sample was observed and recorded and rated. Among them, "0 grade" means that the surface of the coating sample has no wrinkles, no bubbles, and no peeling; "1 grade" means that the area of ​​wrinkles, bubbles, and peeling on the surface of the coating sample is ≤15% and >0%; "2 grade" means that the area of ​​wrinkles, bubbles, and peeling on the surface of the coating sample is ≤50% and >15%; "3 grade" means that the area of ​​wrinkles, bubbles, and peeling on the surface of the coating sample is ≤100% and >50%.

[0120] B. Alkali resistance test

[0121] The coating sample prepared in (1) was immersed in 20L of 10% sodium hydroxide aqueous solution for 45 days. After taking it out, the surface condition of the coating sample was observed and recorded and rated. Among them, "0 grade" means that the surface of the coating sample has no wrinkles, no bubbles, and no peeling; "1 grade" means that the area of ​​wrinkles, bubbles, and peeling on the surface of the coating sample is ≤15% and >0%; "2 grade" means that the area of ​​wrinkles, bubbles, and peeling on the surface of the coating sample is ≤50% and >15%; "3 grade" means that the area of ​​wrinkles, bubbles, and peeling on the surface of the coating sample is ≤100% and >50%.

[0122] (4) Insulation test

[0123] Referring to the QJ2220.2-92 standard, at a voltage of 250V, using 0.01mm annealed aluminum foil as the electrode material, the volume resistivity of the coating sample prepared in (1) was measured; the larger the volume resistivity, the stronger the insulation of the anti-corrosion coating.

[0124] The experimental results are shown in the table below:

[0125] Table 4. Performance test results of the anti-corrosion coatings in each example and comparative example.

[0126]

[0127]

[0128] As shown in Table 4, the anti-corrosion coating of the present invention not only has corrosion resistance but also insulation properties.

[0129] By comparing Examples 1-5 and Comparative Examples 1-4, it can be seen that in the anti-corrosion coating of the present invention, the composite acid composed of fumaric acid and p-hydroxybenzenesulfonic acid in a specific weight ratio can not only form a stable and dense network structure with epoxy resin, isocyanate and other substances in the system through hydrogen bonds, benzene rings and the like, which can resist the penetration of acidic and alkaline corrosive substances and improve the corrosion resistance of the anti-corrosion coating, but also improve the volume resistivity of the anti-corrosion coating, thereby improving the insulation of the anti-corrosion coating.

[0130] By comparing Examples 1, 6-13 and Comparative Examples 5-7, it can be seen that in the anti-corrosion coating of the present invention, the nanocomposite composed of nano boron nitride, nano silica and nano zinc oxide in a specific weight ratio is uniformly distributed in the network structure formed by composite acid, epoxy resin, isocyanate and the like, thereby further improving the stability, density and strength of the network structure, thus better resisting the penetration of acid and alkaline corrosive substances, and better improving the volume resistivity of the anti-corrosion coating, thereby further improving the corrosion resistance and insulation of the anti-corrosion coating.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. An anti-corrosion coating, characterized in that, The components include the following parts by weight: 50-70 parts epoxy resin, 25-45 parts composite acid, 12-18 parts nanocomposite, 4-6 parts isocyanate, 8-12 parts leveling agent, 8-12 parts filler, 4-6 parts antioxidant, 5-20 parts pigment, and 80-120 parts diluent. The composite acid contains fumaric acid and p-hydroxybenzenesulfonic acid in a weight ratio of 1:(0.5-2.5); The nanocomposite contains nano-boron nitride, nano-silica, and nano-zinc oxide.

2. The anti-corrosion coating as described in claim 1, characterized in that, The weight ratio of fumaric acid to p-hydroxybenzenesulfonic acid is 1:(1.0-2.0).

3. The anti-corrosion coating as described in claim 1, characterized in that, The weight ratio of the nano boron nitride, nano silicon dioxide, and nano zinc oxide is 1:(0.05-0.30):(0.10-0.90).

4. The anti-corrosion coating as described in claim 3, characterized in that, The weight ratio of the nano boron nitride, nano silicon dioxide, and nano zinc oxide is 1:(0.10-0.25):(0.25-0.80).

5. The anti-corrosion coating as described in claim 1, characterized in that, Includes at least one of the following (1)-(3): (1) The average particle size of the boron nitride nanoparticles is 100-500 nm; (2) The average particle size of the nano-silica is 50-200 nm; (3) The average particle size of the nano zinc oxide is 40-150 nm.

6. The anti-corrosion coating as described in claim 5, characterized in that, Includes at least one of the following (1)-(3): (1) The average particle size of the nano-boron nitride is 200-400 nm; (2) The average particle size of the nano-silica is 80-120 nm; (3) The average particle size of the nano zinc oxide is 40-60 nm.

7. The anti-corrosion coating as described in claim 1, characterized in that, Includes at least one of the following (1)-(6): (1) The isocyanate is at least one of hexamethylene diisocyanate and isoflurone diisocyanate; (2) The leveling agent is BYK-333; (3) The filler is at least one of aluminum hydroxide, double-fly powder, mica powder, talc powder, and bentonite; (4) The antioxidant is at least one of antioxidant 9614 and antioxidant 1010; (5) The pigment is at least one of titanium dioxide, chrome yellow, molybdenum chrome red, and chrome green; (6) The diluent is at least one of acetone, ethanol, ethyl acetate and toluene.

8. The anti-corrosion coating as described in claim 7, characterized in that, The filler is aluminum hydroxide and double-flying powder in a weight ratio of 1:(3-6).

9. A method for preparing the anti-corrosion coating according to any one of claims 1-8, characterized in that, Includes the following steps: S1. Divide the diluent into 3 portions, namely Diluent I, Diluent II, and Diluent III, for later use; S2. Add fumaric acid, epoxy resin, and nanocomposite to diluent I to obtain component I, for later use; S3. Add p-hydroxybenzenesulfonic acid and isocyanate to diluent II to obtain component II, for later use; S4. Add leveling agent, filler, antioxidant and pigment to diluent III to obtain component III, for later use; S5. Heat component I, add component II and mix, cool down, then add component III to obtain the anti-corrosion coating.

10. The application of the anti-corrosion coating according to any one of claims 1-8 in a distribution box.

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