A method for preventing bird damage and its construction technology

Abstract

The present invention belongs to the field of protection technology, and particularly relates to an anti-bird damage technology method and its construction process, that is, an insulating coating is applied on the surface of the angle steel of the transmission line tower at ground potential, so as to increase the insulation strength between the high-voltage conductor and the angle steel of the transmission line tower and block the discharge path of bird droppings. The implementation key points of the technical method and its application process are to take insulation isolation measures for the tower (cross-arm angle steel) at ground potential to prevent bird damage faults, and have the characteristics of high construction safety, simple maintenance, long service life and obvious anti-bird damage effect. The insulating coating is composed of a single-component or a two-component, and the coating components include a film-forming resin and a curing agent; the film-forming resin used in the single-component or two-component coating is a water-based, oil-based or solvent-free resin, and the curing agent is a curing agent supporting the used resin. The insulating coating of the present invention has good adhesion, high wear resistance and good insulation effect on the surface of the angle steel of the transmission line tower.

Description

Technical Field

[0001] The present invention belongs to the technical field of protection, and particularly relates to a method for preventing bird damage and its construction technology. Background Art

[0002] Tripping accidents caused by bird damage faults account for a large proportion of transmission line faults, seriously affecting the safe and stable operation of power equipment. Existing measures for preventing bird damage mainly include installing anti-bird needles (needle plates), anti-bird baffles, insulating umbrella covers, winding insulating self-adhesive tapes and insulating tapes, or using insulating cross arms, etc. No technical method and construction technology have been found to apply insulating coatings, insulating binding tapes, insulating sheaths, etc. to the surface of tower angle steels at ground potential to prevent bird damage.

[0003] Chinese Patent CN201310360086 proposes to use a wire insulating sheath, a fitting insulating protection box and an insulating hot-melt tape to insulate and cover the grading ring, fittings and wire, thereby isolating various traces that endanger the line caused by bird activities. Chinese Patent CN201320540102 uses an insulating sheath added to the insulators of a 10kV overhead bare wire line. This insulating sheath is composed of a bowl-shaped sheath and a "U"-shaped extended sheath integrally formed of silicone rubber polymer material, which can effectively prevent phase-to-phase short circuits and grounding faults caused by bird damage in the 10kV overhead bare wire line, resulting in line tripping. Chinese Patent CN110301428A provides a new type of anti-bird damage nano-modified composite cross arm and a hydrophobic coating applied on the surface. The cross arm is made of a polyurethane composite material, which has the characteristics of a hard surface, strong hydrophobicity and emitting a special smell, and uses the special smell emitted to achieve the anti-bird damage function.

[0004] Some scholars have used coating technology for bird damage prevention. For example, Chinese Patent CN201710332233 provides a new type of insulator anti-bird damage coating. The coating applied on the insulator has a special smell and color, which can effectively disperse birds from the smell and vision, prevent birds from perching and pecking, and reduce the occurrence of bird damage accidents. Chinese Patent CN112680102B proposes an insulating coating for preventing bird damage to AC / DC filters, a coating and its preparation method. By spraying the insulating coating on the AC filter tower, all charged capacitor shells, frameworks, busbars, grading rings and other accessories are insulated and covered, forming an insulating barrier between groups of components with voltage differences in the filter. At the same time, the invention adds conductive carbon black to the coating to improve the conductive performance of the coating to a certain extent, ensuring that the coating can still maintain a certain conductivity under specific conditions and preventing electrostatic accumulation.

[0005] However, there are some drawbacks in the above-mentioned anti-bird damage control measures. For example, anti-bird needles and anti-bird needle plates will experience metal fatigue and collapse, thus losing their function. Anti-bird baffles will, under the long-term action of wind force and other factors, show problems such as bolt corrosion and fracture, baffle aging and tearing, and excessive opening and closing gaps of the movable baffle at the cross-arm side of the composite insulator. In special weather conditions, due to the accumulation of dirt on the baffle and the flow along the gap, insulator flashover may occur, and it is also easy for the baffle or track to be damaged and fall, resulting in tripping. Anti-bird measures such as insulating self-adhesive tapes, insulating tapes, and insulating umbrella covers have good anti-bird effects, but there are certain risks in construction safety and the safe operation of equipment. Acousto-optic electronic anti-bird devices and the like are relatively expensive, and their service life is generally short due to the life cycle limitations of solar panels and electronic components. Relying on emitting special odors to drive away birds has little practical effect because birds have strong adaptability and the odor concentration gradually weakens over time. In addition, most insulating cross-arms are made of synthetic polymer materials. As the service time goes by, the mechanical properties will age and decline, which will cause potential safety hazards and hinder their application. In short, although the current transmission lines have taken various anti-bird damage measures and are regularly maintained and replaced, the tripping accidents caused by bird damage are still at a high failure rate.

[0006] According to statistical analysis, bird droppings flashover on transmission lines accounts for more than 90% of the total bird damage fault statistics. The main mechanism is that large (migratory) birds perch on the cross-arms of the tower poles, and the bird droppings form a dung chain that falls along the insulator string. This dung chain is a solid-liquid mixture with certain conductivity. When the bird droppings fall, it causes the air gap to be short-circuited, resulting in short-circuit flashover and causing line tripping faults. Or small (resident) birds nest in the empty spaces of the tower cross-arms. When foreign objects fall into the nest grooves, it causes short-circuiting, resulting in air gap flashover and tripping faults. Chinese Patent CN112680102B proposes an anti-bird damage insulating coating for AC / DC filters, but the insulating strength of the coating is not ideal, and the adhesion on the tower angle steel is not ideal, so its anti-bird damage effect is not good.

[0007] Therefore, there is an urgent need for a more effective anti-bird damage method and its application process. Summary of the Invention

[0008] The purpose of the present invention is to provide an anti-bird damage method and its construction process. In view of the above problems, on the basis of the existing anti-bird damage control measures, the present invention discloses a technical method for preventing bird damage by coating an insulating coating on the surface of the angle steel of the ground potential transmission line pole (iron) tower, which is used for anti-bird damage control of overhead transmission lines or surface insulation treatment of the metal framework of other outdoor substation equipment (at ground potential). During on-site application, substances such as film-forming resin, curing agent, pigment filler, and additives are fully mixed and then coated on the surface of the cross-arm angle steel of the transmission tower to form an insulating cover in the area where birds move on the tower. By increasing the insulation strength between the ground potential angle steel and the high-voltage wire, the flashover channel of bird droppings is blocked to achieve the purpose of preventing bird droppings flashover and tripping.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A method for preventing bird damage, wherein an insulating coating is applied to the surface of the angle steel of a transmission line tower at ground potential to increase the insulation strength between the high-voltage conductor and the angle steel of the transmission line tower and block the discharge path of bird droppings.

[0011] Further, the insulating coating includes a one-component coating or a two-component coating, and the raw materials for preparing the coating include a film-forming resin and a curing agent; the film-forming resin is at least one of a water-based resin, an oil-based resin, and a solvent-free resin.

[0012] Further, the insulating coating further includes one or more of an adhesion promoter, an ultraviolet absorber, a film-forming aid, a drier, an activator, a thickener, and an anti-settling agent.

[0013] Further, the film-forming resin includes one or more of an epoxy resin, a polyester resin, a polyimide resin, a polyurethane resin, a silicone resin, a polyolefin resin, a phenolic resin, and a modified derivative.

[0014] Further, the coating is composed of component A and component B, and the weight ratio of component A to component B is (3-5):1; component A includes: 60-65 parts by weight of a modified epoxy resin, 18-24 parts by weight of a polyimide resin, 10-15 parts by weight of a phenolic resin, 10-15 parts by weight of a modified non-conductive filler, 0.5-2 parts by weight of an antifoaming agent, and 3-5 parts by weight of an antioxidant; component B includes 20-25 parts by weight of a curing agent.

[0015] The preparation method of the modified epoxy resin includes the following steps: mixing 0.2-0.6 parts by weight of dibenzoyl peroxide, 5-10 parts by weight of phenylvinyl silicone resin, 5-10 parts by weight of a fluorine-containing monomer, 10 parts by weight of an epoxy resin, 18-23 parts by weight of a vinyl mixed monomer, and 50-60 parts by weight of butyl acetate evenly, and carrying out a polymerization reaction at 400-500 r / min and 70-80 °C for 4-6 h to obtain the modified epoxy resin.

[0016] Further, it is composed of component A and component B, and the weight ratio of component A to component B is (3-5):1; component A includes: 60-65 parts by weight of a modified epoxy resin, 18-24 parts by weight of a polyimide resin, 10-15 parts by weight of a phenolic resin, 10-15 parts by weight of a modified non-conductive filler, 0.5-2 parts by weight of an antifoaming agent, and 3-5 parts by weight of an antioxidant; component B includes 20-25 parts by weight of a curing agent.

[0017] The preparation method of the modified epoxy resin comprises the following steps: uniformly mixing 0.2 - 0.6 parts by weight of benzoyl peroxide, 5 - 10 parts by weight of phenylvinyl silicone resin, 5 - 10 parts by weight of fluorine-containing monomer, 10 parts by weight of epoxy resin, 18 - 23 parts by weight of vinyl mixed monomer and 50 - 60 parts by weight of butyl acetate, and carrying out a polymerization reaction at 400 - 500 r / min and 70 - 80 °C for 4 - 6 h to obtain the modified epoxy resin.

[0018] In order to improve the adhesion of the epoxy resin on the surface of tower angle steel, the present invention modifies the epoxy resin, and the adhesion of the modified coating on the surface of tower angle steel reaches grade 1. Benzoyl peroxide, as an initiator, can initiate the free radical polymerization reaction of phenylvinyl silicone resin, fluorine-containing monomer and vinyl mixed monomer. These monomers may undergo a crosslinking reaction with the epoxy groups in the epoxy resin to form a more complex three-dimensional network structure. This structure can provide more active sites to form chemical bonds with the metal surface. For example, hydrogen bonds or covalent bonds can be formed with the oxide layer on the surface of iron (the main component of angle steel) through hydroxyl groups, carboxyl groups or other polar functional groups. During the curing process, the modified epoxy resin will shrink and penetrate into the fine pores on the surface of the angle steel, forming a so-called "mechanical interlocking" effect, and this physical embedding also increases the bonding strength between the coating and the substrate.

[0019] Further, the phenyl content in the phenylvinyl silicone resin is 30 wt%, and the vinyl content is 0.4 wt%.

[0020] Further, the fluorine-containing monomer comprises a mixture of dodecafluorooctyl methacrylate, dodecafluorooctyl acrylate and hexafluorobutyl acrylate in a weight ratio of 1:(1.2 - 1.5):(0.4 - 0.7).

[0021] Further, the vinyl mixed monomer comprises a mixture of styrene, n-butyl acrylate and methacrylamide in a weight ratio of (1.3 - 1.5):1:(0.5 - 0.8).

[0022] Further, the epoxy resin comprises epoxy resin A with an epoxy equivalent of 190 - 210 g / eq and a viscosity of 600 - 1200 cps / 25 °C, epoxy resin B with an epoxy equivalent of 188 - 199 g / eq and a viscosity of 2100 - 2500 cps / 25 °C, and epoxy resin C with an epoxy equivalent of 170 - 180 g / eq and a viscosity of 600 - 800 cps / 25 °C in a weight ratio of (1.2 - 1.5):1:(0.4 - 0.6).

[0023] Transmission lines are usually located in open areas and are vulnerable to extreme weather such as strong winds, storms, and hailstones. The impact of hailstones or other solid objects may also directly damage the coating. To improve the impact resistance of the coating, the present invention adds polyimide resin and phenolic resin with specific components to the system, which can form a synergistic effect with the modified epoxy resin, thereby improving the impact resistance of the coating.

[0024] Moreover, when using epoxy resin with a specific ratio for modification, the wear resistance of the coating can also be improved. Under such conditions, the coating can form a more complex network structure, thereby enhancing the wear resistance of the coating and resisting the wear of solid debris and large bird claws in the environment.

[0025] Furthermore, the defoamer includes any one or more of BYK-022, BYK-024, or BYK-028.

[0026] Furthermore, the curing agent is any one or more of aliphatic amine, polyamide, polyether amine, or alicyclic amine.

[0027] Furthermore, the antioxidant is one or more of antioxidant 1010, antioxidant 168, or antioxidant 1076.

[0028] Furthermore, the preparation method of the modified non-conductive filler includes the following steps:

[0029] (1) Mix silicon dioxide, boron nitride, and zinc oxide with a weight ratio of 1:(1.5 - 1.7):(0.5 - 0.8) to obtain a mixed filler;

[0030] (2) Mix the mixed filler, γ-aminopropyltriethoxysilane, ethanol, and water with a weight ratio of 3:(0.1 - 0.3):50:100, react at 60 - 65 °C for 6 - 8 h, filter, and wash with water to obtain a silane-modified filler;

[0031] (3) Mix the silane-modified filler with N,N-dimethylformamide, N-(4-anilinophenyl)maleimide (CAS No.: 32099-65-3), and triethylamine with a weight ratio of 3:(12 - 16):(70 - 75):(0.5 - 1.5), heat to 55 - 60 °C and react for 30 - 35 h, filter, wash with water, and dry to obtain the modified non-conductive filler.

[0032] Furthermore, the average particle size of silicon dioxide is 15 nm, and the specific surface area is 250 m 2 / g; the particle size of boron nitride is 100 nm, and the specific surface area is 19 m 2 / g; the average particle size of zinc oxide is 20 nm, and the specific surface area is 100 m 2 / g.

[0033] The present invention can improve the insulation and flame retardancy of coatings by adding modified non-conductive fillers. The compatibility of the modified fillers in the system is higher. Boron nitride not only has excellent electrical insulation performance but also has high thermal conductivity, which can effectively dissipate heat, prevent local overheating, and thus maintain the insulation performance of the material. Silicon dioxide itself has high resistivity and good thermal stability and is an excellent electrical insulation material. It can form a uniformly distributed network in the composite material, effectively blocking the passage of current. Zinc oxide behaves as an insulator at room temperature. It can also absorb ultraviolet light and convert it into heat energy, reducing the aging effect of ultraviolet light on the coating and indirectly improving the long-term insulation performance of the coating. The three play a synergistic role, making the combination between the modified mixed fillers and the matrix closer, forming a dense and uniform coating structure. This structure not only reduces the migration path of charge carriers, improves insulation, but also enhances the physical barrier effect of the coating, blocks the propagation of flames and heat, and improves the flame retardancy resistance.

[0034] In the second aspect of the present invention, a construction process for the bird damage prevention method is provided. After the components of the coating are mixed evenly, they are applied to the surface of the cross-arm angle steel of the transmission tower, with a spraying thickness ≥ 1 mm, and naturally cured to form an insulating covering in the area where birds are active on the tower.

[0035] By applying the insulating coating on the surface of the cross-arm angle steel at ground potential, the insulation strength between the high-voltage wire and the tower cross-arm angle steel is increased and the discharge path of bird droppings is blocked, thereby achieving the purpose of bird damage prevention. This technical method has the characteristics of high safety, simple maintenance, long service life, and obvious bird damage prevention effect.

[0036] The present invention is applicable to the operation stage, infrastructure stage, and production (transformation) tower angle steel stage of transmission lines of 10 kV and above, and can also be applied to the prevention of bird damage in the areas where birds are active in substations. At the same time, this technical method can also be applied to the manufacturing stage of power transmission and transformation equipment.

[0037] The insulating coating can also be used for the surface insulation treatment of substation equipment or other equipment.

[0038] The coating of the present invention forms a firm coating film on the surface of the cross-arm angle steel of the transmission tower through chemical reactions or physical changes between the film-forming resin and the active groups in the curing agent, and has both insulation performance and anti-corrosion performance. This coating is different from a kind of insulating coating for preventing bird damage of AC / DC filters proposed in Patent CN112680102B. None of the components of the coating described in the present invention contain any conductive substances, and the higher the insulation strength of the coating, the better the bird damage prevention effect.

[0039] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0040] 1. The present invention provides a method for preventing bird damage and its construction technology. Through the theoretical mechanism of increasing the insulation strength between the cross-arm angle steel at ground potential and the operating conductor, a technical method of applying an insulating coating on the surface of the cross-arm angle steel is used for preventing bird damage. After the insulating coating is applied on the surface of the cross-arm angle steel, the insulation strength (air + insulating coating) between the cross-arm angle steel and the operating conductor is much higher than the air insulation strength between the original cross-arm angle steel and the operating conductor, thereby achieving the purpose of preventing bird damage. The technical method proposed by the present invention is simple, practical, and effective for a long time, and reduces the impact of traditional anti-bird measures such as anti-bird needles on transmission towers on other high-altitude construction operations, and avoids potential risks in operations on high-voltage conductors and the like.

[0041] 2. The present invention modifies epoxy resin, and the adhesion of the modified coating on the tower angle steel reaches Grade 1.

[0042] 3. The present invention adds polyimide resin and phenolic resin with specific components to the system, which can form a synergistic effect with the modified epoxy resin, thereby improving the impact resistance of the coating.

[0043] 4. When using epoxy resin with a specific ratio for modification, the wear resistance of the coating can also be improved.

[0044] 5. The present invention can improve the insulation and flame retardancy of the coating by adding modified non-conductive fillers. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of the mechanism for preventing bird damage by coating an insulating coating on the cross-arm angle steel of a steel tower. Figure 1 In (a), after the insulating coating is applied on the surface of the cross-arm angle steel of the steel tower, the flashover path of the bird droppings chain is (1)-(2)-(3), RF is the resistance of the insulating coating, Rk is the resistance of the air gap, RJ is the resistance of the insulator (RJ = RF + RJ), and the applied insulating coating enhances the withstand voltage level between the high potential of the overhead conductor and the cross-arm angle steel, so the probability of breakdown of the air gap is reduced, playing a role in preventing bird damage. Figure 1 In (b), assuming the flashover current of the bird droppings in the corresponding electrical circuit is IS, due to the application of the insulating coating on the cross-arm angle steel of the steel tower, the insulation resistance between the steel tower and the high-voltage overhead conductor increases, and the flashover current IS of the bird droppings decreases, and the flashover probability of the bird droppings decreases.

[0046] Figure 2 It is a schematic diagram of on-site coating construction. DETAILED DESCRIPTION OF THE INVENTION

[0047] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0048] Embodiment 1

[0049] This embodiment provides a method for preventing bird damage. An insulating coating is applied to the surface of the angle steel of the transmission line tower at ground potential. The insulating coating consists of component A and component B, and the weight ratio of component A to component B is 4:1. Component A includes: 62 parts by weight of modified epoxy resin, 20 parts by weight of polyimide resin, 13 parts by weight of phenolic resin, 12 parts by weight of modified non-conductive filler, 1.2 parts by weight of defoaming agent, and 4 parts by weight of antioxidant. Component B includes 22 parts by weight of curing agent.

[0050] The preparation method of the modified epoxy resin includes the following steps: Mix 0.4 part by weight of dibenzoyl peroxide, 7 parts by weight of phenylvinyl silicone resin, 8 parts by weight of fluorine-containing monomer, 10 parts by weight of epoxy resin, 20 parts by weight of vinyl mixed monomer, and 55 parts by weight of butyl acetate evenly, and carry out a polymerization reaction at 450 r / min and 75 °C for 5 h to obtain the modified epoxy resin.

[0051] The phenyl content in the phenylvinyl silicone resin is 30 wt%, and the vinyl content is 0.4 wt%. It is purchased from Wuhan Kemike Biopharmaceutical Technology Co., Ltd.

[0052] The fluorine-containing monomer contains a mixture of dodecafluorooctyl methacrylate, dodecafluorooctyl acrylate, and hexafluorobutyl acrylate with a weight ratio of 1:1.4:0.6.

[0053] The vinyl mixed monomer includes a mixture of styrene, n-butyl acrylate, and methacrylamide with a weight ratio of 1.4:1:0.7.

[0054] The epoxy resin includes epoxy resin A with an epoxy equivalent of 190 - 210 g / eq and a viscosity of 600 - 1200 cps / 25 °C, epoxy resin B with an epoxy equivalent of 188 - 199 g / eq and a viscosity of 2100 - 2500 cps / 25 °C, and epoxy resin C with an epoxy equivalent of 170 - 180 g / eq and a viscosity of 600 - 800 cps / 25 °C in a weight ratio of 1.4:1:0.5. It is purchased from Shanghai Qunsheng Chemical Co., Ltd., NPEK series.

[0055] The phenolic resin is purchased from Shanghai Qunsheng Chemical Co., Ltd., model NPEH-720XA65.

[0056] The polyimide resin is purchased from Changzhou Ya'an New Materials Co., Ltd., with the model PAA-4005.

[0057] The defoaming agent is BYK-022.

[0058] The curing agent is aliphatic amine.

[0059] The antioxidant is antioxidant 1010.

[0060] The preparation method of the modified non-conductive filler comprises the following steps:

[0061] (1) Mix silicon dioxide, boron nitride and zinc oxide with a weight ratio of 1:1.6:0.7 to obtain a mixed filler;

[0062] (2) Mix the mixed filler, γ-aminopropyltriethoxysilane, ethanol and water with a weight ratio of 3:0.2:50:100, react at 62 °C for 7 h, filter, and wash with water to obtain a silane-modified filler;

[0063] (3) Heat the silane-modified filler, N,N-dimethylformamide, N-(4-anilinophenyl) maleimide (CAS No.: 32099-65-3) and triethylamine with a weight ratio of 3:14:73:1 to 57 °C and react for 32 h, filter, wash with water and dry to obtain the modified non-conductive filler.

[0064] The average particle size of silicon dioxide is 15 nm, and the specific surface area is 250 m 2 / g (Beijing Decode Island Gold Technology Co., Ltd.); the particle size of boron nitride is 100 nm, and the specific surface area is 19 m 2 / g (Jinlei Technology); the average particle size of zinc oxide is 20 nm, and the specific surface area is 100 m 2 / g (Jinlei Technology).

[0065] Example 2

[0066] This example provides a method for preventing bird damage. An insulating coating is applied to the surface of the angle steel of the transmission line tower at ground potential. The insulating coating consists of component A and component B, and the weight ratio of component A to component B is 5:1; Component A includes: 65 parts by weight of modified epoxy resin, 18 parts by weight of polyimide resin, 15 parts by weight of phenolic resin, 15 parts by weight of modified non-conductive filler, 0.5 parts by weight of defoaming agent, 5 parts by weight of antioxidant; Component B includes 20 parts by weight of curing agent;

[0067] The preparation method of the modified epoxy resin comprises the following steps: Mix 0.6 parts by weight of dibenzoyl peroxide, 5 parts by weight of phenyl vinyl silicone resin, 10 parts by weight of fluorine-containing monomer, 10 parts by weight of epoxy resin, 23 parts by weight of vinyl mixed monomer and 50 parts by weight of butyl acetate evenly, and carry out polymerization reaction at 500 r / min and 70 °C for 6 h to obtain the modified epoxy resin.

[0068] The phenyl content in the phenyl vinyl silicone resin is 30 wt%, and the vinyl content is 0.4 wt%. It is purchased from Wuhan Kemike Biopharmaceutical Technology Co., Ltd.

[0069] The fluorine-containing monomer comprises a mixture of dodecafluorooctyl methacrylate, dodecafluorooctyl acrylate and hexafluorobutyl acrylate with a weight ratio of 1:1.2:0.7.

[0070] The vinyl mixed monomer includes a mixture of styrene, n-butyl acrylate and methacrylamide with a weight ratio of 1.3:1:0.8.

[0071] The epoxy resin includes epoxy resin A with an epoxy equivalent of 190 - 210 g / eq and a viscosity of 600 - 1200 cps / 25 °C, epoxy resin B with an epoxy equivalent of 188 - 199 g / eq and a viscosity of 2100 - 2500 cps / 25 °C, and epoxy resin C with an epoxy equivalent of 170 - 180 g / eq and a viscosity of 600 - 800 cps / 25 °C in a weight ratio of 1.2:1:0.4. It is purchased from Shanghai Qunsheng Chemical Co., Ltd., NPEK series.

[0072] The phenolic resin is purchased from Shanghai Qunsheng Chemical Co., Ltd., model NPEH - 720XA65.

[0073] The polyimide resin is purchased from Changzhou Ya'an New Materials Co., Ltd., model PAA - 4005.

[0074] The defoaming agent is BYK - 024.

[0075] The curing agent is aliphatic amine.

[0076] The antioxidant is antioxidant 168.

[0077] The preparation method of the modified non-conductive filler comprises the following steps:

[0078] (1) Mix silica, boron nitride and zinc oxide with a weight ratio of 1:1.5:0.8 to obtain a mixed filler;

[0079] (2) Mix the mixed filler, γ-aminopropyltriethoxysilane, ethanol and water with a weight ratio of 3:0.3:50:100, react at 60 °C for 8 h, filter, and wash with water to obtain the silane-modified filler;

[0080] (3) Heat the silane-modified filler with a weight ratio of 3:12:75:1.5, N,N-dimethylformamide, N-(4-aminophenyl) maleimide (CAS No.: 32099-65-3), and triethylamine to 55 °C and react for 35 h. Then filter, wash with water, and dry to obtain the modified non-conductive filler.

[0081] The average particle size of the silica is 15 nm, and the specific surface area is 250 m 2 / g (Beijing Decodaojin Technology Co., Ltd.); the particle size of the boron nitride is 100 nm, and the specific surface area is 19 m 2 / g (Jinlei Technology); the average particle size of the zinc oxide is 20 nm, and the specific surface area is 100 m 2 / g (Jinlei Technology).

[0082] Comparative Example 1

[0083] The difference between this comparative example and Example 1 is that the modified epoxy resin is replaced with an epoxy resin. The epoxy resin includes epoxy resin A with an epoxy equivalent of 190 - 210 g / eq and a viscosity of 600 - 1200 cps / 25 °C, epoxy resin B with an epoxy equivalent of 188 - 199 g / eq and a viscosity of 2100 - 2500 cps / 25 °C, and epoxy resin C with an epoxy equivalent of 170 - 180 g / eq and a viscosity of 600 - 800 cps / 25 °C in a weight ratio of 1.4:1:0.5. Purchased from Shanghai Qunsheng Chemical Co., Ltd., NPEK series.

[0084] Comparative Example 2

[0085] The difference between this comparative example and Example 1 is that the addition amounts of the modified epoxy resin, polyimide resin, and phenolic resin are different.

[0086] A special coating for transmission line tower angle steel is composed of component A and component B, and the weight ratio of component A to component B is 4:1. Component A includes: 70 parts by weight of modified epoxy resin, 7 parts by weight of polyimide resin, 18 parts by weight of phenolic resin, 12 parts by weight of modified non-conductive filler, 1.2 parts by weight of defoamer, and 4 parts by weight of antioxidant; component B includes 22 parts by weight of curing agent.

[0087] Comparative Example 3

[0088] The difference between this comparative example and Example 1 is that: the epoxy resin includes epoxy resin A with an epoxy equivalent of 190 - 210 g / eq and a viscosity of 600 - 1200 cps / 25°C, epoxy resin B with an epoxy equivalent of 188 - 199 g / eq and a viscosity of 2100 - 2500 cps / 25°C, and epoxy resin C with an epoxy equivalent of 170 - 180 g / eq and a viscosity of 600 - 800 cps / 25°C, with a weight ratio of 1:1:1. Purchased from Shanghai Qunsheng Chemical Co., Ltd., NPEK series.

[0089] Comparative Example 4

[0090] The difference between this comparative example and Example 1 is that: the fluorinated monomer contains a mixture of dodecafluorooctyl methacrylate, dodecafluorooctyl acrylate, and hexafluorobutyl acrylate with a weight ratio of 1:1:1. The vinyl mixed monomer includes a mixture of styrene, n-butyl acrylate, and methacrylamide with a weight ratio of 1:1:1.

[0091] Comparative Example 5

[0092] The difference between this comparative example and Example 1 is that: silica, boron nitride, and zinc oxide are mixed in a weight ratio of 1:1:1 to obtain a mixed filler.

[0093] Comparative Example 6

[0094] The difference between this comparative example and Example 1 is that: the average particle size of silica is 60 nm, and the specific surface area is 150 - 200 m 2 / g (Beijing Decode Island Gold Technology Co., Ltd.); the particle size of boron nitride is 1 μm, and the specific surface area is 1.6 m 2 / g; the average particle size of zinc oxide is 1 μm, and the specific surface area is 40 m 2 / g (Jinlei Technology).

[0095] Performance Test

[0096] According to the requirements of the "Technical Guide for the Prevention and Control of Bird-Related Faults in Overhead Transmission (Distribution) Lines", in the bird damage activity area of the 110 kV transmission line, use a grinding wheel or manual wire brush and sandpaper to polish and clean the slag, floating ash, and floating slurry parts on the surface of the cross-arm angle steel of the pole tower. After cleaning, the surface should be free of dust, floating slurry, oil stains, mildew spots, salt deposits, moss, and other pollutants and loose attachments. After uniformly stirring the components of the insulating coatings prepared in Examples 1 - 2 and Comparative Examples 1 - 6, spray them on the surface of the cross-arm angle steel in the bird damage activity area of the transmission pole tower respectively, and control the spraying thickness to 2 mm. Conduct performance tests after complete curing.

[0097] Table 1 Performance Test Results

[0098]

[0099] AsFigure 1-2 As shown, from the above performance test results, it can be seen that the coatings of Examples 1-2 have excellent comprehensive performance on the surface of tower angle steel. In particular, the comprehensive performance of Example 1 is the most prominent, which is mainly due to the synergistic effect between components. Figure 1 It is a schematic diagram of the anti-bird damage mechanism of insulating coating applied to the cross-arm angle steel of the iron tower. Figure 1 In (a), after applying the insulating coating on the surface of the cross-arm angle steel of the iron tower, the flashover path of the bird droppings manure chain is (1)-(2)-(3). RF is the resistance of the insulating coating, Rk is the resistance of the air gap, and RJ is the resistance of the insulator (RJ = RF + RJ). The applied insulating coating enhances the withstand voltage level between the high potential of the overhead wire and the cross-arm angle steel, so the probability of the air gap being broken down is reduced, playing an anti-bird damage role. Figure 1 In (b), assuming that the bird droppings flashover current in the corresponding electrical circuit is IS, due to the application of the insulating coating on the cross-arm angle steel of the iron tower, the insulation resistance between it and the high-voltage overhead wire increases, and the bird droppings flashover current IS decreases, and the bird droppings flashover probability decreases.

[0100] For the comparative examples, because the necessary technical solutions were not adopted, their performance in the corresponding performance tests is significantly worse than that of the examples. In Comparative Example 1, the epoxy resin was not modified, resulting in a decrease in adhesion. In Comparative Example 2, the addition amounts of the modified epoxy resin, polyimide resin, and phenolic resin were different, resulting in a decrease in impact resistance. In Comparative Example 3, the ratio of the epoxy resin was different, resulting in a decrease in wear resistance. In Comparative Example 4, the fluorine-containing monomer and vinyl mixed monomer for preparing the modified epoxy resin were different, resulting in a decrease in adhesion. In Comparative Example 5, the base cloth of the filler was different. In Comparative Example 6, the parameters of the filler were different, resulting in a decrease in insulation and flame retardancy. The above experimental results further prove the importance of the technical solutions defined in the present invention for its technical effects.

[0101] The above is the preferred implementation mode of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle described in the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A bird damage prevention method, characterized in that, Apply an insulating coating on the surface of the angle steel of the transmission line tower at ground potential to increase the insulation strength between the high-voltage conductor and the angle steel of the transmission line tower and block the discharge path of bird droppings; The insulating coating is composed of component A and component B in a weight ratio of (3-5):1; Component A includes: 60-65 parts by weight of modified epoxy resin, 18-24 parts by weight of polyimide resin, 10-15 parts by weight of phenolic resin, 10-15 parts by weight of modified non-conductive filler, 0.5-2 parts by weight of defoamer, 3-5 parts by weight of antioxidant; Component B includes 20-25 parts by weight of curing agent; The preparation method of the modified epoxy resin includes: mixing 0.2-0.6 parts by weight of dibenzoyl peroxide, 5-10 parts by weight of phenylvinyl silicone resin, 5-10 parts by weight of fluorine-containing monomer, 10 parts by weight of epoxy resin, 18-23 parts by weight of vinyl mixed monomer and 50-60 parts by weight of butyl acetate evenly, and carrying out polymerization reaction at 400-500 r / min and 70-80 °C for 4-6 h to obtain the modified epoxy resin; The fluorine-containing monomer contains a mixture of dodecafluoroheptyl methacrylate, dodecafluoroheptyl acrylate and hexafluorobutyl acrylate in a weight ratio of 1:(1.2-1.5):(0.4-0.7); The vinyl mixed monomer includes a mixture of styrene, n-butyl acrylate and methacrylamide in a weight ratio of (1.3-1.5):1:(0.5-0.8); The epoxy resin includes epoxy resin A with an epoxy equivalent of 190-210 g / eq and a viscosity of 600-1200 cps / 25 °C, epoxy resin B with an epoxy equivalent of 188-199 g / eq and a viscosity of 2100-2500 cps / 25 °C, and epoxy resin C with an epoxy equivalent of 170-180 g / eq and a viscosity of 600-800 cps / 25 °C in a weight ratio of (1.2-1.5):1:(0.4-0.6); The preparation method of the modified non-conductive filler includes: (1) Mix silicon dioxide, boron nitride and zinc oxide in a weight ratio of 1:(1.5-1.7):(0.5-0.8) to obtain a mixed filler; (2) Mix the mixed filler, γ-aminopropyltriethoxysilane, ethanol and water in a weight ratio of 3:(0.1-0.3):50:100, react at 60-65 °C for 6-8 h, filter, and wash with water to obtain a silane-modified filler; (3) Heat the silane-modified filler, N,N-dimethylformamide, N-(4-anilinophenyl)maleimide and triethylamine in a weight ratio of 3:(12-16):(70-75):(0.5-1.5) to 55-60 °C and react for 30-35 h, filter, wash with water and dry to obtain the modified non-conductive filler; The average particle size of silicon dioxide is 15 nm, and its specific surface area is 250 m 2 / g; the particle size of boron nitride is 100 nm, and its specific surface area is 19 m 2 / g; the average particle size of zinc oxide is 20 nm, and its specific surface area is 100 m 2 / g.

2. The anti-bird damage method according to claim 1, wherein The insulating coating further includes one or more of an adhesion promoter, an ultraviolet absorber, a film-forming aid, a dryer, an activator, a thickener, and an anti-settling agent.

3. The construction process of the bird damage prevention method according to claim 2, characterized in that, After mixing the components of the coating evenly, apply it to the surface of the cross-arm angle steel in the area where birds are active on the transmission tower, and the spraying thickness is ≥1 mm, and cure naturally.

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