阅读说明：本技术 一种降低耐候钢杆塔接地电阻防雷涂料及制备方法 (Lightning protection coating for reducing grounding resistance of weathering resistant steel pole tower and preparation method thereof ) 是由 赵玉顺 闫程 卫明浩 王书涛 于 2021-09-23 设计创作，主要内容包括：本发明公开了一种降低耐候钢杆塔接地电阻防雷涂料及制备方法,属于防雷涂料技术领域。所述防雷涂料包括包括如下重量百分比的组分：脂环族环氧树脂40％～60％,炭黑30％～40％,光引发剂1.5％～8％,导电填料1％～5％,流变剂0.1％～1％,流平剂0.2％～0.6％,附着力促进剂0.2％～0.6％,分散剂3％～5％。所述防雷涂料制备方法简单。利用本发明防雷涂料制得的涂层附着性能好、成型快,具有优异的防锈和导电性能,适合各种大小形状的耐候钢杆塔,降低接地电阻,减少雷击闪络事故发生。(The invention discloses a lightning protection coating for reducing the grounding resistance of a weathering steel pole tower and a preparation method thereof, belonging to the technical field of lightning protection coatings. The lightning protection coating comprises the following components in percentage by weight: 40-60% of alicyclic epoxy resin, 30-40% of carbon black, 1.5-8% of photoinitiator, 1-5% of conductive filler, 0.1-1% of rheological agent, 0.2-0.6% of flatting agent, 0.2-0.6% of adhesion promoter and 3-5% of dispersant. The preparation method of the lightning protection paint is simple. The coating prepared by the lightning protection coating has good adhesion performance, quick forming and excellent rust prevention and electric conductivity, is suitable for weather-resistant steel poles and towers in various sizes and shapes, reduces the grounding resistance and reduces the occurrence of lightning flashover accidents.)

1. The lightning protection coating for reducing the grounding resistance of the weathering steel tower is characterized by comprising the following components in percentage by weight:

40-60% of alicyclic epoxy resin;

30% -40% of carbon black;

1.5 to 8 percent of photoinitiator;

1% -5% of conductive filler;

3.5 to 7.2 percent of other auxiliary agents.

2. The lightning protection coating for reducing the ground resistance of the weathering steel tower as claimed in claim 1, wherein the other additives comprise the following components in percentage by weight:

0.1 to 1 percent of rheological agent;

0.2 to 0.6 percent of flatting agent;

0.2 to 0.6 percent of adhesion promoter;

3 to 5 percent of dispersant.

3. The lightning protection coating for reducing the grounding resistance of a weathering steel tower as claimed in claim 1, wherein the alicyclic epoxy resin is at least one of 3, 4-epoxycyclohexylmethyl-3, 4-epoxycyclohexyl formate and 4, 5-epoxyhexane-1, 2-diglycidyl ester.

4. The lightning protection coating for reducing the grounding resistance of the weathering steel tower as claimed in claim 1, wherein the photoinitiator is at least one of triarylsulfonium salt and diaryliodonium salt.

5. The lightning protection coating for reducing the ground resistance of a weathering steel tower as claimed in claim 1, wherein the conductive filler is at least one of graphene and carbon nanotubes.

6. The lightning protection coating for reducing the grounding resistance of the weathering steel pole tower as claimed in claim 2, wherein the rheological agent is a modified urea solution.

7. The lightning protection coating for reducing the grounding resistance of a weathering steel tower as claimed in claim 2, wherein the leveling agent is at least one of acrylates and polyether modified silicones.

8. The lightning protection coating for reducing the ground resistance of the weathering steel pole tower as claimed in claim 2, wherein the adhesion promoter is phosphate acrylate.

9. The lightning protection coating for reducing the grounding resistance of the weathering steel pole tower as claimed in claim 2, wherein the dispersant is at least one of ethylene oxide condensates and block modified polyethers.

10. The preparation method of the lightning protection coating for reducing the grounding resistance of the weathering steel tower according to any one of claims 1 to 9, characterized by comprising the following steps:

at normal temperature, adding the alicyclic epoxy resin, the carbon black and the dispersant into a reaction container for stirring and mixing, wherein the stirring speed is 200-400 rpm, and the stirring time is 1-2 h; then adding the conductive filler into a reaction container to continue stirring and mixing, wherein the stirring speed is 200-400 rpm, and the stirring time is 30 min-1 h; and finally, adding the rheological agent, the leveling agent, the adhesion promoter and the photoinitiator into a reaction container, stirring and mixing at the stirring speed of 200-400 rpm for 10-30 min, and obtaining the lightning protection coating for reducing the grounding resistance of the weathering steel pole tower after stirring and mixing.

Technical Field

The invention belongs to the technical field of lightning protection coatings, and particularly relates to a lightning protection coating for reducing the grounding resistance of a weather-resistant steel pole tower and a preparation method thereof.

Background

With the development of the power industry and the enhancement of the environmental awareness of human beings, the use of weather-resistant steel materials in towers has become a trend. However, other problems also occur when the weather-resistant steel material is used as the main material of the transmission tower: because the oxidation protective layer generated on the surface of the material has higher resistance, and meanwhile, the protective layer gathering positions are arranged among tower nodes, higher lapping resistance is formed at the connecting position of the tower angle steel material. When the tower falls down from the mine, the potential of the tower body of the tower rises, and a higher risk of flashover caused by insulation breakdown of the tower is possibly generated. In addition, the weathering steel pole tower is in strict environment, and the weathering steel pole tower can appear the corrosion phenomenon in the time of the day, further increases junction tower resistance, increases the insulating flashover risk of pole tower.

The ultraviolet curing coating is widely valued for the advantages of fast curing, no need of high temperature, no generation of bubbles, good film surface gloss and the like, and the ultraviolet curing coating prepared by taking the alicyclic epoxy resin as a substrate has strong weather resistance, high hardness, wear resistance, impact resistance, corrosion resistance, good caking property and the like. The arrangement mode of the carbon atoms in the graphene is a honeycomb type layered structure with sp hybridized orbitals forming bonds, pz orbitals of each carbon atom, which are perpendicular to the plane of the layer, can form large pi bonds of multiple atoms penetrating through the whole layer, and the graphene has excellent conductivity and optical performance. The graphene has the characteristics of large specific surface area, high strength and the like, and can optimize the corrosion resistance, mechanical properties and the like of a coating product. In addition, the carbon nano tube has the same lamellar structure as the graphene, and also has excellent conductivity, and researches show that the conductivity of the conductive filler compounded by the graphene and the carbon nano tube is superior to the performance of the conductive filler independently used as the filler, so that the conductive filler compounded by the graphene and other nano particles has good application significance in reducing the grounding resistance of the weathering steel pole tower.

At present, the conductive coating and the preparation method thereof have become hot research problems in the fields of electricity, electronics and the like, which have been deeply theoretically analyzed by academic papers and have engineering methods for practical application, such as the invention patent application specification "a preparation method of nano anticorrosive conductive coating" (CN113122112A) and "a water-based graphene conductive coating and its preparation method" (CN 110564233 a). Wherein the content of the first and second substances,

in the invention, the invention discloses a water-based graphene conductive coating and a preparation method thereof, which are disclosed in 2019, 12 and 13, and the specification CN110564233A of the Chinese invention patent application only completes the stripping and dispersion of the expanded graphite and the preparation of the water-based conductive coating through a process link of high-pressure homogenization. The existing defects mainly comprise: the coating is a water-based conductive coating obtained by adopting water-soluble resin emulsion, the water-based coating has the problems of low adhesive force, easy shedding and the like, and the water-soluble resin has poor weather resistance and is not suitable for outdoor environment.

The preparation method of the nano anticorrosive conductive coating disclosed in the patent application publication specification CN113122112A of china at 7/16/2021 is to perform ultrasonic treatment, cutting and high-pressure homogenization on carbon nanotubes and carbon nanofibers in advance to ensure the density of the coating, and further to mix the carbon nanotubes and carbon nanofibers with metal particles and perform corona treatment to improve the conductivity of the coating. However, this method has the following disadvantages:

1) the method of the coating needs to cut the carbon nanotubes and the carbon nanofibers, and the operation process of the method is complicated as the nano materials are cut.

2) The method of the coating involves plasma corona treatment to improve the conductivity of the coating, but studies show that there is timeliness in improving the conductivity by corona, and the timeliness determines that the method is not environmentally friendly.

In addition, the conductive coating in the prior art is mainly applied to a steady-state low-current environment, and the weather-resistant steel pole tower lightning protection coating faces transient lightning current, so that the conductive coating in the prior art is not suitable for lightning protection of the weather-resistant steel pole tower.

Disclosure of Invention

The invention aims to solve the technical problems of poor environmental adaptability, high volume resistivity, complex preparation process and the like in the prior art, and provides a lightning protection coating for reducing the grounding resistance of a weathering steel pole tower and a preparation method thereof. Specifically, the lightning protection coating for reducing the grounding resistance of the weathering steel tower is prepared by adopting epoxy resin with large binding power and strong weather resistance as a matrix, graphene with good conductivity and carbon nano tubes as conductive fillers and various auxiliaries and adopting a photocuring method.

In order to achieve the aim, the invention provides a lightning protection coating for reducing the grounding resistance of a weathering steel tower, which comprises the following components in percentage by weight:

40-60% of alicyclic epoxy resin;

30% -40% of carbon black;

1.5 to 8 percent of photoinitiator;

1% -5% of conductive filler;

3.5 to 7.2 percent of other auxiliary agents.

Preferably, the other auxiliary agents comprise the following components in percentage by weight:

0.1 to 1 percent of rheological agent;

0.2 to 0.6 percent of flatting agent;

0.2 to 0.6 percent of adhesion promoter;

3 to 5 percent of dispersant.

Preferably, the alicyclic epoxy resin is at least one of 3, 4-epoxycyclohexylmethyl-3, 4-epoxycyclohexyl formate and 4, 5-epoxyhexane-1, 2-diglycidyl ester.

Preferably, the photoinitiator is at least one of triarylsulfonium salt and diaryliodonium salt.

Preferably, the conductive filler is at least one of graphene and carbon nanotubes.

Preferably, the rheological agent is a modified urea solution.

Preferably, the leveling agent is at least one of acrylates and polyether modified organic silicon.

Preferably, the adhesion promoter is a phosphate acrylate.

Preferably, the dispersant is at least one of ethylene oxide condensates and block-modified polyethers.

The invention also provides a preparation method of the lightning protection coating for reducing the grounding resistance of the weathering steel pole tower, which comprises the following steps:

at normal temperature, adding the alicyclic epoxy resin, the carbon black and the dispersant into a reaction container for stirring and mixing, wherein the stirring speed is 200-400 rpm, and the stirring time is 1-2 h; then adding the conductive filler into a reaction container to continue stirring and mixing, wherein the stirring speed is 200-400 rpm, and the stirring time is 30 min-1 h; and finally, adding the rheological agent, the leveling agent, the adhesion promoter and the photoinitiator into a reaction container, stirring and mixing at the stirring speed of 200-400 rpm for 10-30 min, and obtaining the lightning protection coating for reducing the grounding resistance of the weathering steel pole tower after stirring and mixing.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention adopts the alicyclic epoxy resin with good weather resistance, low viscosity and good high-temperature insulation as the coating substrate, so that the lightning protection coating has excellent performances of good weather resistance, ultraviolet resistance and the like, and the environmental adaptability of the lightning protection coating is obviously improved.

2. The invention mixes the alicyclic resin with the carbon black with a specific proportion, adds the conductive filler with a specific proportion, and combines various auxiliary agents, so that the lightning protection coating has extremely small volume resistivity, and the effect of reducing the grounding resistance of the weathering steel pole tower is very obvious.

3. The preparation method of the lightning protection coating is simple to operate and convenient for large-scale production.

Detailed Description

The technical solution of the present invention is further illustrated below with reference to specific examples and comparative examples.

The cycloaliphatic epoxy resins used in the following examples and comparative examples were 4, 5-epoxyhexane-1, 2-diglycidyl ester, available from Tiangao New technology Co., Ltd, TDE-85. The photoinitiator was a triarylsulfonium salt available from JZG-2102 of Nanjing Jia chemical Co. The rheological agent is a modified urea solution, and is purchased from JZ-456 of Nanjing Jia chemical industry Co. The leveling agent is acrylate, and is purchased from JZ-533 of Nanjing Jia chemical industry Co. The adhesion promoter is phosphate acrylate, and is purchased from JZ-402 of Nanjing Jia chemical industry Co. The dispersant is block modified polyether, and is KMT-3003 available from New Kening materials Co., Ltd, Fushan. Carbon black, graphene and carbon nanotubes are common products in the market.

Example 1

The lightning protection coating for reducing the grounding resistance of the weathering steel tower in the embodiment comprises the following components in percentage by weight:

the conductive filler comprises graphene and carbon nanotubes, and the mass ratio of the graphene to the carbon nanotubes is 1: 1.

The preparation method of the lightning protection coating for reducing the grounding resistance of the weathering steel pole tower in the embodiment comprises the following steps: at normal temperature, adding the alicyclic epoxy resin, the carbon black and the dispersant into a reaction vessel for stirring and mixing, wherein the stirring speed is 300rpm, and the stirring time is 1 h; then adding the conductive filler into the reaction vessel, and continuously stirring and mixing at the stirring speed of 300rpm for 30 min; and finally, adding the rheological agent, the leveling agent, the adhesion promoter, the dispersant and the photoinitiator into a reaction container, stirring and mixing at the stirring speed of 300rpm for 10min to obtain the lightning protection coating for reducing the grounding resistance of the weathering steel tower after stirring and mixing.

The lightning protection coating for reducing the grounding resistance of the weathering steel pole tower in the embodiment is coated on the surface of the weathering steel, and the 20-watt LED lamp irradiates for 30s to obtain a lightning protection coating with the thickness of 20 microns.

Example 2

The lightning protection coating for reducing the grounding resistance of the weathering steel tower in the embodiment comprises the following components in percentage by weight:

the conductive filler comprises graphene and carbon nano tubes, and the mass ratio of the graphene to the carbon nano tubes is 1: 2.

The preparation method of the lightning protection coating in this example is the same as that of example 1.

Example 3

The lightning protection coating for reducing the grounding resistance of the weathering steel tower in the embodiment comprises the following components in percentage by weight:

the conductive filler comprises graphene and carbon nano tubes, and the mass ratio of the graphene to the carbon nano tubes is 1: 3.

The preparation method in this example is the same as example 1.

Comparative example 1

The lightning protection coating for reducing the grounding resistance of the weathering steel pole tower is different from that in the embodiment 1 in that: no conductive filler is added. Specifically, the paint comprises the following components in percentage by weight:

the preparation method of the lightning protection coating in the comparative example is as follows:

at normal temperature, adding the alicyclic epoxy resin, the carbon black and the dispersant into a reaction vessel for stirring and mixing, wherein the stirring speed is 300rpm, and the stirring time is 1 h; and then adding the rheological agent, the leveling agent, the adhesion promoter, the dispersant and the photoinitiator into a reaction container for stirring and mixing, wherein the stirring speed is 300rpm, the stirring time is 10min, and the lightning protection coating for reducing the grounding resistance of the weathering steel tower is obtained after stirring and mixing are completed.

The lightning protection coating for reducing the grounding resistance of the weathering steel pole tower in the comparative example is coated on the surface of the weathering steel, and the 20-watt LED lamp irradiates for 30s to obtain the lightning protection coating with the thickness of 20 microns.

Comparative example 2

The lightning protection coating for reducing the grounding resistance of the weathering steel pole tower is different from that in the embodiment 1 in that: no carbon black and no conductive filler were added. Specifically, the paint comprises the following components in percentage by weight:

the preparation method of the lightning protection coating in the comparative example is as follows:

at normal temperature, adding the alicyclic epoxy resin, the rheological agent, the leveling agent, the adhesion promoter, the dispersant and the photoinitiator into a reaction vessel, stirring and mixing at the stirring speed of 300rpm for 10min to obtain the lightning protection coating for reducing the grounding resistance of the weathering steel pole tower after stirring and mixing.

The lightning protection coating for reducing the grounding resistance of the weathering steel pole tower in the comparative example is coated on the surface of the weathering steel, and the 20W LED lamp irradiates for 30s to obtain the lightning protection coating with the thickness of 20 microns.

The lightning protection coatings prepared in examples 1-3 and comparative examples 1-2 were respectively subjected to performance tests, and the test results are shown in table 1.

TABLE 1 Properties of coatings obtained in examples 1-3 and comparative examples 1-2

As can be seen from the results of table 1, first, the coating obtained by photocuring with the cycloaliphatic epoxy resin exhibited excellent salt water resistance after soaking in a salt water solution for 168 hours. Second, the coatings obtained in examples 1-3 exhibit very low resistivity. Comparative example 1, in which no conductive filler was added, had a volume resistivity significantly lower than that of examples 1-3, and comparative example 2, in which no carbon black and no conductive filler were added, had a volume resistivity that was not an order of magnitude at all as compared to that of examples 1-3. The result fully shows that the coating prepared by the lightning protection coating for reducing the grounding resistance of the weathering steel pole tower has excellent environmental adaptability and conductivity, and can ensure the occurrence of lightning flashover accidents of the weathering steel pole tower.