Insulating paint for overhead equipment of distribution network and preparation method of insulating paint

Abstract

The invention provides an insulating coating for overhead equipment of a distribution network and a preparation method of the insulating coating. The insulating paint for the distribution network overhead equipment comprises a component A and a component B, wherein the component A comprises the following components in parts by mass: 80-120 parts of matrix resin, 10-20 parts of pigment, 0.5-1 part of polydimethylsiloxane, 2-10 parts of an anti-settling agent, 0.1-0.5 part of an ultraviolet absorbent and 15-40 parts of an organic solvent; the component B is a curing agent; the ultraviolet absorbent is prepared from diethanol amine, 2, 4-dihydroxy benzophenone, 3-mercaptopropionic acid and polyethylene glycol diacrylate through a reaction. The insulating paint for the distribution network overhead equipment, prepared by the invention, still has better salt fog resistance, heat resistance and adhesive force even after being irradiated by a xenon lamp, has higher impact strength and volume resistivity, and has good ageing resistance, and the service life is remarkably prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to an insulating coating for overhead distribution network equipment and a preparation method thereof. Background Art

[0002] As an important part of the power system, overhead distribution equipment undertakes the key task of transmitting and distributing electric energy. The safety and reliability of these equipment directly affect the stability and efficiency of power supply. Insulating coatings are widely used to improve the performance of these equipment. Insulating coatings can not only effectively isolate current and prevent short circuits and other electrical faults, but also withstand harsh environmental conditions such as ultraviolet rays, humidity and temperature changes. By using high-quality insulating coatings, the service life and operational safety of overhead distribution equipment can be significantly improved, thereby ensuring the stable operation of the power system.

[0003] However, the existing insulating coatings for overhead distribution network equipment generally have problems such as insufficient weather resistance and poor mechanical properties. When the existing insulating coatings are exposed to outdoor environments for a long time, such as ultraviolet radiation, wind and rain erosion, temperature changes and other extreme weather conditions, their adhesion, salt spray resistance and heat resistance will gradually decrease, causing the coating to age, crack or even fall off, thus affecting the normal operation and service life of the equipment. In addition, the mechanical strength of existing insulating coatings, such as impact strength, is often difficult to meet the actual application requirements, and is easily physically damaged or worn during use, thereby reducing the insulation effect and the performance of the insulating coating, and increasing safety hazards.

[0004] Therefore, in view of the problems existing in the insulating coatings of the prior art, how to develop a new insulating coating with good adhesion, salt spray resistance and heat resistance, high impact strength and other mechanical properties, and at the same time good insulation performance to ensure the safe and stable operation of distribution network overhead equipment is a problem to be solved urgently in the present invention. Summary of the invention

[0005] The object of the present invention is to provide an insulating coating for overhead distribution network equipment and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: On the one hand, the present invention provides an insulating coating for overhead distribution network equipment, the insulating coating for overhead distribution network equipment comprises component A and component B, wherein component A comprises the following components in parts by mass: 80-120 parts of base resin, 10-20 parts of pigment, 0.5-1 part of polydimethylsiloxane, 2-10 parts of anti-settling agent, 0.1-0.5 part of ultraviolet absorber, and 15-40 parts of organic solvent;

[0007] The component B is a curing agent;

[0008] The ultraviolet absorber is prepared by reacting diethanolamine, 2,4-dihydroxybenzophenone, 3-mercaptopropionic acid and polyethylene glycol diacrylate.

[0009] Furthermore, the matrix resin is a mixture of polytetrafluoroethylene resin and modified waterborne polyurethane.

[0010] Furthermore, the preparation method of the ultraviolet absorber comprises the following steps:

[0011] (1) placing diethanolamine in a first reaction kettle, heating it to 60-75° C., adding an aldehyde reaction aid, and keeping the temperature at 80-90° C. for a period of time, then adding 2,4-dihydroxybenzophenone and an alcohol organic solvent, heating the temperature to 85-100° C., and then keeping the temperature for reaction, and post-treating to obtain an intermediate 1;

[0012] (2) placing the intermediate 1, 3-mercaptopropionic acid, and a ketone organic solvent into a second reaction kettle, stirring until dissolved, adding a promoter, reacting sufficiently, and post-treating to obtain the intermediate 2;

[0013] (3) placing the intermediate II, polyethylene glycol diacrylate and a volatile organic solvent into a third reaction kettle for reflux reaction, and after the reaction is completed, post-processing is performed to obtain a UV absorber.

[0014] Furthermore, the modified waterborne polyurethane is prepared by reacting polytetrafluoroethylene resin, waterborne polyurethane and a silane coupling agent.

[0015] Furthermore, the component B is 5-10% of the mass of the base resin.

[0016] Furthermore, the mass ratio of the polytetrafluoroethylene resin to the modified waterborne polyurethane is 1:0.4-0.6.

[0017] Furthermore, the component A also contains 0.5-1 part of a defoaming agent.

[0018] Furthermore, the defoaming agent is a silicone defoaming agent.

[0019] Furthermore, the silane coupling agent is at least one of 3-aminopropyltriethoxysilane, isobutyltriethoxysilane, and γ-aminoethylaminopropyltrimethoxysilane.

[0020] Furthermore, the curing agent is an isocyanate curing agent; preferably, the isocyanate curing agent is at least one of isophorone diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, and polymethylene polyphenyl polyisocyanate.

[0021] On the other hand, the present invention also provides a method for preparing an insulating coating for overhead distribution network equipment, comprising the following steps:

[0022] Add base resin, pigment, polydimethylsiloxane, anti-settling agent, ultraviolet absorber and organic solvent into a high-speed disperser and disperse them evenly to obtain component A. When using, mix component A and component B evenly.

[0023] Compared with the prior art, the beneficial effects of the present invention are: the insulating coating for distribution network overhead equipment prepared by the present invention still has better salt spray resistance, heat resistance and adhesion even after irradiation by a hernia lamp, and has higher impact strength and volume resistivity, and has good aging resistance, and its service life is significantly improved. DETAILED DESCRIPTION

[0024] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following embodiments are examples of the present invention and are only used to illustrate the present invention, but not to limit the present invention. Other combinations and various modifications within the concept of the present invention may be performed without departing from the spirit or scope of the present invention.

[0025] In the following examples, except for UV absorber A and modified waterborne polyurethane A, the other compound monomers and related reagents used can be purchased from the market, among which polytetrafluoroethylene resin was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd. with the item number P434340; polytetrafluoroethylene resin emulsion was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd. with the item number P111312; waterborne polyurethane was purchased from Jining Huakai Resin Co., Ltd. with the brand name XN8810; paraformaldehyde was purchased from Shandong Xuchen Chemical Technology Co., Ltd. with the CAS number 30525-89-4; polyethylene glycol diacrylate was purchased from from Shandong Baositai Medical Materials Co., Ltd., CAS number is 26570-48-9; polydimethylsiloxane was purchased from Shanghai Jizhi Biochemical Technology Co., Ltd., CAS number is 9006-65-9; conventional UV absorber was purchased from Dongguan Dinghai Plastic Chemical Co., Ltd., CAS number is 1843-05-6; mica powder was purchased from Guangzhou Taizhu Fine Chemical Co., Ltd., model number is 429.439; silicone defoamer was purchased from Foshan Corning New Materials Co., Ltd., model number is KMT-2023; anti-settling agent was purchased from Suzhou Huiwangcheng Chemical Co., Ltd., model number is BENTONE27.

[0026] The preparation method of ultraviolet absorber A comprises the following steps:

[0027] (1) 4.46 g of diethanolamine was placed in a first reaction kettle, heated to 70° C., and then paraformaldehyde was added in 5 portions, each adding 0.26 g, with an interval of 20 min between two additions. After the addition of paraformaldehyde was completed, the mixture was kept at 80° C. for 3 h, and then 4.55 g of 2,4-dihydroxybenzophenone and 25 mL of methanol were added. The mixture was heated to 85° C. and kept for reaction for 3 h. The mixture was distilled under reduced pressure, washed with water, and freeze-dried to obtain an intermediate 1.

[0028] (2) 13.2 g of intermediate 1, 10 g of 3-mercaptopropionic acid, and 120 mL of acetone were placed in a second reaction kettle, stirred until dissolved, and then 19.5 g of N,N'-dicyclohexylcarbodiimide was added. The mixture was stirred and reacted at room temperature for 40 h. After the reaction was completed, the generated N,N-dicyclohexylurea was filtered out, and the obtained product was placed in ice water, washed 4 times, and dried to obtain intermediate 2;

[0029] (3) 1 g of intermediate II, 1.2 g of polyethylene glycol diacrylate, and 30 mL of chloroform were placed in a third reaction kettle and refluxed at 60° C. After reacting for 30 hours, the solvent was removed and the mixture was dried in vacuum to obtain UV absorber A.

[0030] The preparation method of modified waterborne polyurethane A comprises the following steps:

[0031] After adding 0.5 g of 3-aminopropyltriethoxysilane to 50 g of polytetrafluoroethylene resin emulsion, the mixture was stirred for 20 min, and then 75 g of waterborne polyurethane was added. The mixture was stirred for 20 min to obtain modified waterborne polyurethane A, wherein the stirring speed was 120 r / min.

[0032] The preparation method of the insulating coating for overhead distribution network equipment of Examples 1-5 and Comparative Examples 1-2 comprises the following steps:

[0033] Add base resin, pigment, polydimethylsiloxane, UV absorber, defoamer, anti-settling agent and organic solvent into a high-speed disperser at a speed of 600 r / min. After uniform dispersion, component A is obtained. When in use, mix component A and component B evenly at a mixing speed of 120 r / min.

[0034] The required components and the contents of each component in Examples 1-5 and Comparative Examples 1-2 are shown in Table 1-2:

[0035] Table 1

[0036]

[0037] Table 2

[0038]

[0039]

[0040] After mixing the insulating coatings for overhead distribution network equipment prepared in Examples 1-5 and Comparative Examples 1-2, they were respectively applied on stainless steel sheets with surface grinding (the size of the stainless steel sheets was 5 cm × 12 cm × 0.1 cm, and the coating thickness was 30 μm) and cured, and then placed at a temperature of (23 ± 2) ° C, relative air humidity of (50 ± 5)%, and irradiated by a 6kW xenon lamp for 24 hours for adhesion, salt spray resistance, volume resistivity, impact strength, and heat resistance tests. The test methods are as follows:

[0041] Adhesion test: Tested according to GB / T 9286-1998 standard;

[0042] Salt spray resistance test: Tested in accordance with GB / T 1771-2007 standard;

[0043] Volume resistivity test: Tested in accordance with GB / T1410-2006 standard;

[0044] Impact strength test: Tested in accordance with GB / T2571-1995 standard;

[0045] Heat resistance test: Refer to GB / T1735-2009 to test how long the coating can remain intact at 550°C without peeling, wrinkling, cracking or blistering.

[0046] The test results are shown in Table 3, as follows:

[0047] Table 3

[0048]

[0049]

[0050] From the comparison between Example 1 and Comparative 1, it can be seen that the use of ultraviolet absorber A enables the insulating coating for overhead distribution network equipment to still have excellent salt spray resistance, heat resistance, adhesion, high impact strength and volume resistivity after being irradiated by a xenon lamp;

[0051] From the comparison between Example 1 and Comparative Example 2, it can be seen that the combination of ultraviolet absorber A, modified waterborne polyurethane and polytetrafluoroethylene resin enables the prepared insulating coating for overhead distribution network equipment to have better salt spray resistance, heat resistance, higher impact strength and volume resistivity after being irradiated by a hernia lamp, and the adhesion is significantly improved;

[0052] From the comparison between Example 1 and Example 4-5, it can be seen that the use of modified waterborne polyurethane and polytetrafluoroethylene resin can improve the salt spray resistance, heat resistance, impact strength and volume resistivity of the insulating coating for overhead distribution network equipment to a certain extent after being irradiated by a hernia lamp, and the adhesion is also improved;

[0053] From the comparison of Examples 1-3, it can be seen that the insulating coating for distribution network overhead equipment prepared using the components and contents provided by the present invention still has better salt spray resistance, heat resistance and adhesion even after irradiation with a hernia lamp, and has higher impact strength and volume resistivity, and has good aging resistance, and its service life is significantly improved.

[0054] The above implementation modes are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An insulating coating for overhead distribution network equipment, characterized in that: The insulating coating for overhead distribution network equipment comprises component A and component B, wherein component A comprises the following components in parts by mass: 80-120 parts of base resin, 10-20 parts of pigment, 0.5-1 part of polydimethylsiloxane, 2-10 parts of anti-settling agent, 0.1-0.5 part of ultraviolet absorber, and 15-40 parts of organic solvent; The component B is a curing agent; The ultraviolet absorber is prepared by reacting diethanolamine, 2,4-dihydroxybenzophenone, 3-mercaptopropionic acid and polyethylene glycol diacrylate.

2. The insulating coating for overhead distribution network equipment according to claim 1, characterized in that: The matrix resin is a mixture of polytetrafluoroethylene resin and modified waterborne polyurethane.

3. The insulating coating for overhead distribution network equipment according to claim 1, characterized in that: The preparation method of the ultraviolet absorber comprises the following steps: (1) Diethanolamine is placed in a first reaction kettle, heated to 60-75°C, an aldehyde reaction aid is added, and the temperature is kept at 80-90°C for a period of time. 2,4-dihydroxybenzophenone and an alcohol organic solvent are then added, and the temperature is raised to 85-100°C for a reaction, followed by post-treatment to obtain an intermediate 1; (2) placing intermediate 1, 3-mercaptopropionic acid, and a ketone organic solvent into a second reaction kettle, stirring until dissolved, adding a promoter, reacting sufficiently, and post-treating to obtain intermediate 2; (3) placing the intermediate II, polyethylene glycol diacrylate and a volatile organic solvent into a third reaction kettle for reflux reaction, and after the reaction is completed, post-treatment is performed to obtain a UV absorber.

4. The insulating coating for overhead distribution network equipment according to claim 2, characterized in that: The modified waterborne polyurethane is prepared by reacting polytetrafluoroethylene resin, waterborne polyurethane and a silane coupling agent.

5. The insulating coating for overhead distribution network equipment according to claim 1, characterized in that: The component B accounts for 5-10% of the mass of the base resin.

6. The insulating coating for overhead distribution network equipment according to claim 1, characterized in that: The mass ratio of the polytetrafluoroethylene resin to the modified waterborne polyurethane is 1:0.4-0.

6.

7. The insulating coating for overhead distribution network equipment according to claim 6, characterized in that: The component A further comprises 0.5-1 part of a defoaming agent.

8. The insulating coating for overhead distribution network equipment according to claim 7, characterized in that: The defoamer is an organosilicon defoamer.

9. The insulating coating for overhead distribution network equipment according to claim 4, characterized in that: The silane coupling agent is at least one of 3-aminopropyltriethoxysilane, isobutyltriethoxysilane and γ-aminoethylaminopropyltrimethoxysilane.

10. A method for preparing an insulating coating for overhead distribution network equipment according to any one of claims 1 to 9, characterized in that: The following steps are involved: Add base resin, pigment, polydimethylsiloxane, anti-settling agent, ultraviolet absorber and organic solvent into a high-speed disperser and disperse them evenly to obtain component A. When using, mix component A and component B evenly.

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