Bird damage prevention method and construction process thereof

Abstract

The invention belongs to the technical field of protection, and particularly relates to a bird damage prevention technical method and a construction process thereof, that is, the surface of a power transmission line tower angle steel at a ground potential is coated with an insulating coating, so that the insulating strength between a high-voltage wire and the power transmission line tower angle steel is improved, and a bird droppings discharge path is blocked. The implementation key points of the technical method and the application process are that the tower (cross arm angle steel) at the ground potential is subjected to insulation isolation measures to prevent bird trouble faults, and the technical method and the application process have the characteristics of high construction operation safety, simplicity in maintenance, long service life, obvious bird trouble prevention effect and the like. The insulating paint is composed of a single component or two components, and the paint comprises film-forming resin and a curing agent; the film-forming resin used by the single-component or double-component coating is aqueous, oily or solvent-free resin, and the curing agent is a curing agent matched with the resin. The insulating coating disclosed by the invention is good in adhesive force on the surface of the transmission line tower angle steel, high in wear resistance and good in insulating effect.

Description

Technical Field

[0001] The invention belongs to the technical field of protection, and in particular relates to a method for preventing bird damage and a construction process thereof. Background Art

[0002] Tripping accidents caused by bird damage account for a large proportion of transmission line failures, seriously affecting the safe and stable operation of power equipment. Existing bird damage prevention measures mainly include installing bird-proof needles (needle plates), bird-proof baffles, insulating umbrellas, and wrapping insulating self-adhesive tapes, insulating wrapping tapes, or using insulating crossarms. No technical methods and construction processes have been found to apply insulating coatings, insulating binding tapes, and insulating sheaths to the surface of pole tower angle steel at ground potential to prevent bird damage.

[0003] Chinese patent CN201310360086 proposes to use wire insulation sheath, hardware insulation protection box and insulating hot-melt tape to insulate the equalizing ring, hardware and wire, so as to isolate various traces of bird activities that endanger the line. Chinese patent CN201320540102 uses an insulating sheath added to the insulator of a 10kV overhead bare wire line. This insulating sheath is composed of a bowl-shaped sheath and a "U"-shaped extension sheath integrally formed of silicone rubber polymer material, which can effectively prevent and control the line tripping caused by the phase-to-phase short circuit and grounding fault of the 10kV overhead bare wire line caused by bird damage. Chinese patent CN110301428A provides a new type of bird-proof nano-modified composite crossarm and a hydrophobic coating coated on the surface. The crossarm is made of polyurethane composite material, has the characteristics of hard surface, strong hydrophobicity and emitting a special smell, and uses the special smell emitted to achieve the bird-proof function.

[0004] Scholars have adopted coating technology to prevent bird damage. For example, Chinese patent CN201710332233 provides a new type of insulator bird damage prevention coating. The coating applied to the insulator has a special smell and color, which effectively disperses birds from the smell and visual sense, prevents birds from landing and pecking, and reduces the occurrence of bird damage accidents. Chinese patent CN112680102B proposes an AC / DC filter bird damage prevention insulating coating, coating and preparation method thereof. By spraying insulating coating on the AC filter tower, all charged capacitor housings, frames, mother tubes, grading rings and other accessories are insulated and covered, forming an insulating barrier between the various 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 to prevent static electricity accumulation.

[0005] However, each of the above bird-proofing measures has some drawbacks. For example, bird-proofing needles and bird-proofing needle plates will collapse due to metal fatigue and lose their function. Bird-proofing baffles will rust and break due to long-term wind and other effects, baffles will age and tear, and the gap between the movable baffles on the side of the composite insulator crossarm is too large. Under special meteorological conditions, dirt will accumulate on the baffles and flow down the gaps, causing insulator flashover. It is also easy for the baffles or rails to break and fall, causing tripping. Insulating self-adhesive tapes, insulating tapes, insulating umbrella covers, etc. have good bird-proofing effects, but there are certain risks in terms of construction safety and safe operation of equipment. The price of acoustic, optical and electronic bird-proofing devices is relatively high, and their service life is generally short due to the life cycle of solar panels and electronic components. Relying on the emission of special odors to drive away birds is very limited because birds have strong adaptability and the concentration of odors gradually weakens over time, so the actual application effect is minimal. In addition, most insulating crossarms are synthesized from polymer materials. As the mechanical properties of the insulation crossarms age over time, they will cause safety hazards and hinder their application. In short, although the current transmission lines have adopted a variety of bird damage prevention measures and are regularly maintained and replaced, 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 number of bird damage failures. The main mechanism is that large (migratory) birds roost on the crossarms of towers, and the birds excrete feces to form feces chains that fall along the insulator strings. This feces chain is a solid-liquid mixture with a certain conductivity. When the bird droppings fall, the air gap is short-circuited, causing short-circuit flashover and line tripping failure, or small (staying) birds nest in the empty space of the crossarms of towers. When foreign objects fall from the nests, short-circuiting causes air gap flashover and tripping failure. Chinese patent CN112680102B proposes an AC / DC filter anti-bird damage insulation coating, but the coating insulation strength is not ideal, and the adhesion on the tower angle steel is not ideal, and its anti-bird damage effect is not good.

[0007] Therefore, a more effective bird-prevention method and its application process are urgently needed. Summary of the invention

[0008] The purpose of the present invention is to provide a method for preventing bird damage and its construction process. In view of the above-mentioned problems, on the basis of existing bird damage prevention measures, the present invention discloses a technical method for coating an insulating coating on the surface of the angle steel of the ground potential transmission line pole (iron) tower to prevent bird damage, which is used for bird damage prevention of overhead transmission lines or insulation treatment of the surface of the metal structure of other outdoor substation equipment (ground potential). When used on site, the film-forming resin, curing agent, pigment filler, additive and other substances are fully mixed and evenly coated on the surface of the cross-arm angle steel of the transmission tower to form an insulating cover in the bird tower activity area, and the increased insulation strength between the ground potential angle steel and the high-voltage conductor is used to block the bird droppings flashover channel to achieve the purpose of preventing bird droppings from flashover tripping.

[0009] In order to achieve the above object, the present invention provides the following technical solutions: A method for preventing bird damage includes coating insulating paint on the surface of the angle steel of the transmission line tower at ground potential, thereby increasing the insulation strength between the high-voltage conductor and the angle steel of the transmission line tower and blocking the discharge path of bird droppings.

[0010] Furthermore, the insulating coating comprises a single-component coating or a two-component coating, and the raw materials for preparing the coating comprise a film-forming resin and a curing agent; the film-forming resin is at least one of a water-based resin, an oily resin or a solvent-free resin.

[0011] Furthermore, the insulating coating also includes one or more of an adhesion promoter, an ultraviolet absorber, a film-forming aid, a drying agent, an activator, a thickener, and an anti-settling agent.

[0012] Furthermore, the film-forming resin includes one or more of epoxy resin, polyester resin, polyimide resin, polyurethane resin, silicone resin, polyolefin resin, phenolic resin, and modified derivatives.

[0013] Furthermore, 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 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, and 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 comprises the following steps: uniformly mixing 0.2-0.6 parts by weight of dibenzoyl peroxide, 5-10 parts by weight of phenyl vinyl 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 performing polymerization reaction at 400-500 r / min and 70-80° C. for 4-6 hours to obtain the modified epoxy resin.

[0014] Further, it is composed of component A and component B, the weight ratio of component A to component B is (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 comprises the following steps: uniformly mixing 0.2-0.6 parts by weight of dibenzoyl peroxide, 5-10 parts by weight of phenyl vinyl 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 performing polymerization reaction at 400-500 r / min and 70-80° C. for 4-6 hours to obtain the modified epoxy resin.

[0015] In order to improve the adhesion of 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 level 1. Dibenzoyl peroxide is used as an initiator to initiate free radical polymerization of phenyl vinyl silicone resin, fluorine-containing monomers and vinyl mixed monomers. These monomers may undergo cross-linking reactions with the epoxy groups in the epoxy resin to form a more complex three-dimensional network structure. This structure can provide more active sites for chemical bonding with the metal surface, such as forming hydrogen bonds or covalent bonds with the oxide layer on the surface of iron (the main component of angle steel) through hydroxyl, carboxyl or other polar functional groups. During the curing process, the modified epoxy resin will shrink and penetrate into the tiny pores on the surface of the angle steel, forming a so-called "mechanical interlocking" effect. This physical embedding also increases the bonding strength between the coating and the substrate.

[0016] Furthermore, the phenyl content in the phenyl vinyl silicone resin is 30wt%, and the vinyl content is 0.4wt%.

[0017] Furthermore, the fluorine-containing monomer comprises a mixture of dodecafluoroheptyl methacrylate, dodecafluoroheptyl acrylate and hexafluorobutyl acrylate in a weight ratio of 1: (1.2-1.5): (0.4-0.7).

[0018] Furthermore, the vinyl mixed monomer comprises styrene, n-butyl acrylate and methacrylamide in a weight ratio of (1.3-1.5):1:(0.5-0.8).

[0019] Furthermore, 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).

[0020] Transmission lines are usually located in open areas and are easily affected by extreme weather such as strong winds, storms, and hail. Hail or other solid objects may also directly damage the coating. In order to improve the impact resistance of the coating, the present invention adds specific components of polyimide resin and phenolic resin to the system, which can form a synergistic effect with the modified epoxy resin, thereby improving the impact resistance of the coating.

[0021] And when modified with epoxy resin in a specific ratio, the wear resistance of the coating can also be improved. Under this condition, the coating can form a more complex network structure, thereby improving the wear resistance of the coating and resisting the wear of the coating by solid debris in the environment, large bird claws, etc.

[0022] Furthermore, the defoaming agent includes any one or more of BYK-022, BYK-024 or BYK-028.

[0023] Furthermore, the curing agent is any one or more of aliphatic amine, polyamide, polyether amine or alicyclic amine.

[0024] Furthermore, the antioxidant is one or more of antioxidant 1010 , antioxidant 168 or antioxidant 1076 .

[0025] Furthermore, the preparation method of the modified non-conductive filler comprises the following steps: (1) mixing 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) Mixing a mixed filler, γ-aminopropyltriethoxysilane, ethanol and water in a weight ratio of 3: (0.1-0.3): 50: 100, reacting at 60-65° C. for 6-8 hours, filtering, and washing with water to obtain a silane-modified filler; (3) A silane-modified filler and N,N-dimethylformamide, N-(4-anilinophenyl)maleimide (CAS No.: 32099-65-3) and triethylamine in a weight ratio of 3: (12-16): (70-75): (0.5-1.5) are heated to 55-60° C. for reaction for 30-35 hours, filtered, washed with water and dried to obtain a modified non-conductive filler.

[0026] 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 100nm and the specific surface area is 19 m 2 / g; the average particle size of zinc oxide is 20nm and the specific surface area is 100m 2 / g.

[0027] The present invention can improve the insulation and flame retardancy of the coating by adding modified non-conductive fillers. The modified filler has higher compatibility in the system, and boron nitride not only has excellent electrical insulation performance, but also has high thermal conductivity, which can effectively dissipate heat and prevent local overheating, thereby maintaining 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 preventing the passage of current. Zinc oxide behaves as an insulator at room temperature. It can also absorb ultraviolet rays and convert them into heat energy, reduce the aging effect of ultraviolet rays on the coating, and indirectly improve the long-term insulation performance of the coating. The three play a synergistic role, and the modified mixed filler and the matrix are more closely combined to form a dense and uniform coating structure. This structure not only reduces the migration path of charge carriers and improves insulation, but also enhances the physical barrier effect of the coating, prevents the spread of flames and heat, and improves flame resistance.

[0028] The second aspect of the present invention provides a construction process for the bird damage prevention method. After the components of the coating are evenly mixed, the coating is applied to the surface of the cross arm angle steel of the transmission tower. The spraying thickness is ≥1mm, and the coating is naturally cured to form an insulating cover in the bird tower activity area.

[0029] The insulating coating is applied to the surface of the cross-arm angle steel at ground potential to increase the insulation strength between the high-voltage conductor and the cross-arm angle steel of the tower and block the discharge path of bird droppings, 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.

[0030] The present invention is applicable to the operation stage, infrastructure stage and production (renovation) stage of angle steel of towers of 10 kV and above transmission lines, and can also be applied to bird-damage prevention and control in bird activity areas in substations. At the same time, the technical method can also be applied to the manufacturing stage of power transmission and transformation equipment.

[0031] The insulating coating can also be used for surface insulation treatment of power transformation equipment or other equipment.

[0032] The coating of the present invention forms a firm coating on the surface of the cross arm angle steel of the transmission tower through chemical reaction or physical change between the film-forming resin and the active groups in the curing agent, and has both insulation and corrosion resistance. This coating is different from the bird-proof insulating coating for AC and DC filters proposed in patent CN112680102B. The coating described in the present invention does not contain any conductive substances in its components, and the higher the insulation strength of the coating, the better the bird-proof effect.

[0033] Compared with the prior art, the advantages and beneficial effects of the present invention are: 1. The present invention provides a method for preventing bird damage and its construction process. By increasing the theoretical mechanism of the insulation strength between the cross-arm angle steel of the tower at ground potential and the operating conductor, the technical method of applying an insulating coating on the surface of the cross-arm angle steel is used to prevent bird damage. After the cross-arm angle steel surface is coated with the insulating coating, 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 bird damage prevention. The technical method proposed by the present invention is simple, practical, and effective for a long time. It reduces the impact of traditional bird prevention measures such as bird-proofing needles on transmission towers on other high-altitude construction operations, and avoids the potential risks of operations on high-voltage conductors.

[0034] 2. The present invention modifies the epoxy resin, and the adhesion of the modified coating on the surface of the tower angle steel reaches level 1.

[0035] 3. The present invention adds specific components of polyimide resin and phenolic resin into the system, which can form a synergistic effect with the modified epoxy resin, thereby improving the impact resistance of the coating.

[0036] 4. When modified with epoxy resin in a specific ratio, the wear resistance of the coating can also be improved.

[0037] 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

[0038] Figure 1 Schematic diagram of the mechanism of applying insulating coating to the cross arm angle steel of the tower to prevent bird damage. Figure 1 In (a), after the insulating coating is applied on the surface of the cross-arm angle steel of the tower, the flashover path of the guano chain is (1)-(2)-(3), where RF is the insulating coating resistance, Rk is the air gap resistance, and RJ is the insulator resistance (RJ=RF+RJ). The applied insulating coating enhances the withstand voltage level between the high potential of the overhead conductor and the cross-arm angle steel, thereby reducing the probability of the air gap being broken down and playing a role in preventing bird damage. Figure 1 In (b), assume that the guano flashover current in the corresponding electrical circuit is IS. Because the cross-arm angle steel of the tower is coated with an insulating coating, the insulation resistance with the high-voltage overhead wire increases, the guano flashover current IS decreases, and the guano flashover probability decreases.

[0039] Figure 2 This is a schematic diagram of on-site coating construction. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Example 1 This embodiment provides 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, wherein the insulating coating is composed of component A and component B, wherein the weight ratio of component A to component B is 4:1; component A comprises: 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 comprises 22 parts by weight of curing agent; The preparation method of the modified epoxy resin comprises the following steps: 0.4 parts by weight of dibenzoyl peroxide, 7 parts by weight of phenyl vinyl 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 are uniformly mixed, and polymerization reaction is carried out at 450 r / min and 75° C. for 5 hours to obtain the modified epoxy resin.

[0042] The phenyl vinyl silicone resin has a phenyl content of 30 wt % and a vinyl content of 0.4 wt %, and was purchased from Wuhan Kemik Biopharmaceutical Technology Co., Ltd.

[0043] The fluorine-containing monomer comprises a mixture of dodecafluoroheptyl methacrylate, dodecafluoroheptyl acrylate and hexafluorobutyl acrylate in a weight ratio of 1:1.4:0.6.

[0044] The vinyl mixed monomer comprises styrene, n-butyl acrylate and methacrylamide in a weight ratio of 1.4:1:0.7.

[0045] The epoxy resins include 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.

[0046] The phenolic resin was purchased from Shanghai Qunsheng Chemical Co., Ltd., model NPEH-720XA65.

[0047] The polyimide resin was purchased from Changzhou Yaan New Materials Co., Ltd., model PAA-4005.

[0048] The defoamer is BYK-022.

[0049] The curing agent is a fatty amine.

[0050] The antioxidant is antioxidant 1010.

[0051] The preparation method of the modified non-conductive filler comprises the following steps: (1) mixing silicon dioxide, boron nitride and zinc oxide in a weight ratio of 1:1.6:0.7 to obtain a mixed filler; (2) Mixing a mixed filler, γ-aminopropyltriethoxysilane, ethanol and water in a weight ratio of 3:0.2:50:100, reacting at 62°C for 7 hours, filtering, and washing with water to obtain a silane-modified filler; (3) A silane-modified filler and N,N-dimethylformamide, N-(4-anilinophenyl)maleimide (CAS No.: 32099-65-3) and triethylamine in a weight ratio of 3:14:73:1 were heated to 57°C for reaction for 32 hours, filtered, washed with water and dried to obtain a modified non-conductive filler.

[0052] The average particle size of silica is 15 nm and the specific surface area is 250 m 2 / g (Beijing Dekedaojin Technology Co., Ltd.); the particle size of boron nitride is 100nm and the specific surface area is 19 m 2 / g (Jinlei Technology); the average particle size of zinc oxide is 20nm and the specific surface area is 100m 2 / g (Jinlei Technology).

[0053] Example 2 This embodiment provides 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, wherein the insulating coating is composed of component A and component B, wherein the weight ratio of component A to component B is 5:1; component A comprises: 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, and 5 parts by weight of antioxidant; component B comprises 20 parts by weight of curing agent; The preparation method of the modified epoxy resin comprises the following steps: 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 are uniformly mixed, and polymerization reaction is carried out at 500 r / min, 70° C. for 6 hours to obtain the modified epoxy resin.

[0054] The phenyl vinyl silicone resin has a phenyl content of 30 wt % and a vinyl content of 0.4 wt %, and was purchased from Wuhan Kemik Biopharmaceutical Technology Co., Ltd.

[0055] The fluorine-containing monomer comprises a mixture of dodecafluoroheptyl methacrylate, dodecafluoroheptyl acrylate and hexafluorobutyl acrylate in a weight ratio of 1:1.2:0.7.

[0056] The vinyl mixed monomer comprises styrene, n-butyl acrylate and methacrylamide in a weight ratio of 1.3:1:0.8.

[0057] The epoxy resins include 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. Purchased from Shanghai Qunsheng Chemical Co., Ltd., NPEK series.

[0058] The phenolic resin was purchased from Shanghai Qunsheng Chemical Co., Ltd., model NPEH-720XA65.

[0059] The polyimide resin was purchased from Changzhou Yaan New Materials Co., Ltd., model PAA-4005.

[0060] The defoamer is BYK-024.

[0061] The curing agent is a fatty amine.

[0062] The antioxidant is antioxidant 168.

[0063] The preparation method of the modified non-conductive filler comprises the following steps: (1) mixing silicon dioxide, boron nitride and zinc oxide in a weight ratio of 1:1.5:0.8 to obtain a mixed filler; (2) Mixing a mixed filler, γ-aminopropyltriethoxysilane, ethanol and water in a weight ratio of 3:0.3:50:100, reacting at 60°C for 8 hours, filtering, and washing with water to obtain a silane-modified filler; (3) A silane-modified filler and N,N-dimethylformamide, N-(4-anilinophenyl)maleimide (CAS No.: 32099-65-3) and triethylamine in a weight ratio of 3:12:75:1.5 were heated to 55°C for reaction for 35 hours, filtered, washed with water and dried to obtain a modified non-conductive filler.

[0064] The average particle size of silica is 15 nm and the specific surface area is 250 m 2 / g (Beijing Dekedaojin Technology Co., Ltd.); the particle size of boron nitride is 100nm and the specific surface area is 19 m 2 / g (Jinlei Technology); the average particle size of zinc oxide is 20nm and the specific surface area is 100m2 / g (Jinlei Technology).

[0065] Comparative Example 1 The difference between this comparative example and Example 1 is that the modified epoxy resin is replaced by an epoxy resin, and 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, purchased from Shanghai Qunsheng Chemical Co., Ltd., NPEK series.

[0066] Comparative Example 2 The difference between this comparative example and Example 1 is that the added amounts of the modified epoxy resin, the polyimide resin and the phenolic resin are different.

[0067] A special coating for transmission line tower angle steel, consisting of component A and component B, wherein the weight ratio of component A to component B is 4:1; component A comprises: 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 comprises 22 parts by weight of curing agent.

[0068] Comparative Example 3 The difference between this comparative example and Example 1 is that the epoxy resin includes epoxy resin A with epoxy equivalent of 190-210 g / eq and viscosity of 600-1200 cps / 25°C, epoxy resin B with epoxy equivalent of 188-199 g / eq and viscosity of 2100-2500 cps / 25°C, and epoxy resin C with epoxy equivalent of 170-180 g / eq and viscosity of 600-800 cps / 25°C in a weight ratio of 1:1:1. Purchased from Shanghai Qunsheng Chemical Co., Ltd., NPEK series.

[0069] Comparative Example 4 The difference between this comparative example and Example 1 is that the fluorine-containing monomer comprises a mixture of dodecafluoroheptyl methacrylate, dodecafluoroheptyl acrylate and hexafluorobutyl acrylate in a weight ratio of 1:1:1. The vinyl mixed monomer comprises a mixture of styrene, n-butyl acrylate and methacrylamide in a weight ratio of 1:1:1.

[0070] Comparative Example 5 The difference between this comparative example and Example 1 is that silicon dioxide, boron nitride and zinc oxide are mixed in a weight ratio of 1:1:1 to obtain a mixed filler.

[0071] Comparative Example 6 The difference between this comparative example and Example 1 is that the average particle size of silicon dioxide is 60nm and the specific surface area is 150-200m 2 / g (Beijing Dekedaojin 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 1μm and the specific surface area is 40m 2 / g (Jinlei Technology).

[0072] Performance Testing According to the requirements of the Technical Guidelines for the Prevention and Control of Bird-Involved Faults on Overhead Transmission (Distribution) Lines, a grinder or a manual wire brush and sandpaper are used to grind and clean the slag inclusions, floating dust, and laitance on the surface of the cross-arm angle steel of the tower in the bird-damage activity area of ​​the 110 kV transmission line. After cleaning, there is no dust, no laitance, no oil stains, no mildew spots, no salt precipitates, no moss and other pollutants and loose attachments on the surface. After the components of the insulating coatings prepared in Examples 1-2 and Comparative Examples 1-6 are stirred evenly, they are sprayed on the surface of the cross-arm angle steel in the bird-damage activity area on the transmission tower, and the spraying thickness is controlled to 2 mm. After complete curing, performance testing is carried out.

[0073] Table 1 Performance test results

[0074] like Figure 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, especially the comprehensive performance of Example 1 is the most outstanding, which is mainly due to the synergistic effect between the components. Figure 1 Schematic diagram of the mechanism of applying insulating coating to the cross arm angle steel of the tower to prevent bird damage. Figure 1 In (a), after the insulating coating is applied on the surface of the cross-arm angle steel of the tower, the flashover path of the guano chain is (1)-(2)-(3), where RF is the insulating coating resistance, Rk is the air gap resistance, and RJ is the insulator resistance (RJ=RF+RJ). The applied insulating coating enhances the withstand voltage level between the high potential of the overhead conductor and the cross-arm angle steel, thereby reducing the probability of the air gap being broken down and playing a role in preventing bird damage. Figure 1 In (b), assume that the guano flashover current in the corresponding electrical circuit is IS. Because the cross-arm angle steel of the tower is coated with an insulating coating, the insulation resistance with the high-voltage overhead wire increases, the guano flashover current IS decreases, and the guano flashover probability decreases.

[0075] However, the comparative examples are significantly worse than the embodiments in the corresponding performance tests because they do not adopt the necessary technical solutions. In comparative example 1, the epoxy resin is not modified, and the adhesion is reduced. In comparative example 2, the addition amounts of modified epoxy resin, polyimide resin and phenolic resin are different, and the impact resistance is reduced. In comparative example 3, the epoxy resin ratio is different, and the wear resistance is reduced. In comparative example 4, the fluorine-containing monomer and the vinyl mixed monomer used to prepare the modified epoxy resin are different, and the adhesion is reduced. In comparative example 5, the filler has different grey cloth. In comparative example 6, the filler parameters are different, and the insulation and flame retardancy are reduced. The above experimental results further prove the importance of the technical solution defined in the present invention for its technical effect.

[0076] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preventing bird damage, characterized in that: Insulating paint is applied to 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.

2. The bird damage prevention method according to claim 1, characterized in that: The insulating coating includes a single-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 oily resin or a solvent-free resin.

3. The bird damage prevention method according to claim 2, characterized in that: The insulating coating may further include one or more of an adhesion promoter, an ultraviolet absorber, a film-forming aid, a drying agent, an activator, a thickener, and an anti-settling agent.

4. The bird damage prevention method according to claim 3, characterized in that: The film-forming resin includes one or more of epoxy resin, polyester resin, polyimide resin, polyurethane resin, silicone resin, polyolefin resin, phenolic resin, and modified derivatives.

5. The bird damage prevention method according to claim 3, characterized in that: The insulating coating is composed of component A and component B, wherein the weight ratio of component A to component B is (3-5):1; component A comprises: 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, and 3-5 parts by weight of antioxidant; component B comprises 20-25 parts by weight of curing agent; The preparation method of the modified epoxy resin comprises the following steps: uniformly mixing 0.2-0.6 parts by weight of dibenzoyl peroxide, 5-10 parts by weight of phenyl vinyl 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 performing polymerization reaction at 400-500 r / min and 70-80° C. for 4-6 hours to obtain the modified epoxy resin.

6. The bird damage prevention method according to claim 3, characterized in that: The fluorine-containing monomer comprises a mixture of dodecafluoroheptyl methacrylate, dodecafluoroheptyl acrylate and hexafluorobutyl acrylate in a weight ratio of 1: (1.2-1.5): (0.4-0.7).

7. The bird damage prevention method according to claim 3, characterized in that: The vinyl mixed monomer comprises styrene, n-butyl acrylate and methacrylamide in a weight ratio of (1.3-1.5):1:(0.5-0.8).

8. The bird damage prevention method according to claim 3, characterized in that: The preparation method of the modified non-conductive filler comprises the following steps: (1) mixing 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) Mixing a mixed filler, γ-aminopropyltriethoxysilane, ethanol and water in a weight ratio of 3: (0.1-0.3): 50: 100, reacting at 60-65° C. for 6-8 hours, filtering, and washing with water to obtain a silane-modified filler; (3) A silane-modified filler and N,N-dimethylformamide, N-(4-anilinophenyl)maleimide and triethylamine in a weight ratio of 3: (12-16): (70-75): (0.5-1.5) are heated to 55-60° C. for reaction for 30-35 hours, filtered, washed with water and dried to obtain a modified non-conductive filler.

9. A construction process for the method for preventing bird damage according to any one of claims 1 to 8, characterized in that: After mixing the components of the coating evenly, apply it to the surface of the cross arm angle steel in the bird activity area of ​​the transmission tower, with a spray thickness of ≥1mm, and allow to cure naturally.

10. The application process of the method for preventing bird damage according to claim 9, characterized in that: The insulating coating is replaced by an insulating binding tape and an insulating sheath and is coated on the surface of the angle steel of the pole tower at the ground potential.

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