Bird-repellent silicone rubber composite insulator and preparation method and application thereof

Abstract

The invention belongs to the technical field of electric power insulation equipment, and particularly relates to a bird-repellent silicone rubber composite insulator and a preparation method and application thereof. According to the bird-repelling silicone rubber composite insulator, bird-repelling essential oil microcapsules are uniformly distributed in heat vulcanization type silicone rubber serving as an external insulating material of the bird-repelling silicone rubber composite insulator; a core material of the anti-bird essential oil microcapsule is prepared from the following raw materials in parts by weight: phenyl salicylate, a grapefruit peel ethanol extract, a cinnamon bark ethanol extract, civet ketone, quercitrin and butylated hydroxytoluene. According to the present invention, the bird repelling essential oil microcapsule is added during the silicone rubber mixing process by using the existing silicone rubber composite insulator production technology, such that the good endogenous bird repelling function is provided, the repelling broad spectrum is provided, and the repelling timeliness is long and can achieve more than 10 years.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrical insulation equipment, and particularly relates to a bird-repellent silicone rubber composite insulator, a preparation method thereof, and an application thereof. Background Art

[0002] The silicone rubber composite insulator is composed of an outer insulating material silicone rubber, a glass fiber reinforced core rod, and metal end fittings. It has good adaptability during the operation of overhead transmission lines and has gradually become the preferred product to replace porcelain (glass) insulators. It is widely used in high-performance insulation equipment in the power system, especially in fields such as high-voltage transmission lines, substations, and electrified railways. The application ratio of composite insulators in overhead transmission lines reaches more than 80%.

[0003] Along with the wide application of silicone rubber composite insulators, the silicone rubber composite insulators also face serious problems of bird damage. The harm of birds to silicone rubber composite insulators is mainly manifested in behaviors such as pecking, perching, or excreting, resulting in flashover accidents such as phase-to-phase short circuits, becoming the main accident cause seriously endangering the safe operation of the power grid. The annual loss caused by bird damage to power transmission and transformation lines is more than tens of billions.

[0004] Currently, the main methods for preventing bird damage are installing anti-bird spines, bird-repellent reflectors, bird-repellent windmills, voice bird-repellent devices, ultrasonic bird-repellent devices, drug-type bird-repellent devices, etc. These methods for preventing (controlling) birds are all exogenous and it is difficult to fundamentally solve the problem of bird damage.

[0005] Patent CN101864171B discloses a preparation method of an anti-bird silicone rubber composite insulator. Although this solution essentially belongs to an endogenous bird-repellent method and can solve the problem of bird damage to power transmission and transformation lines to a certain extent, the repellent effective substances and repellent mechanisms used are both too single. It only achieves the purpose of repelling birds by releasing odors that birds dislike, so it will only have a repellent effect on certain birds. In addition, the repellent timeliness of the described anti-bird silicone rubber composite insulator is short, only about 3 years. Summary of the Invention

[0006] The purpose of the present invention is to provide a bird-repellent silicone rubber composite insulator, a preparation method thereof, and an application thereof in view of the above-mentioned existing defects. By using the existing production technology of silicone rubber composite insulators, bird-repellent essential oil microcapsules are added during the silicone rubber mixing process, endowing the existing ordinary silicone rubber composite insulators with better endogenous bird-repellent functions, having broad-spectrum repellency, and a long repellent timeliness, which can reach more than 10 years.

[0007] The technical solution of the present invention is as follows: A bird-repellent silicone rubber composite insulator, in which bird-repellent essential oil microcapsules are uniformly distributed in the heat-cured silicone rubber of the outer insulating material.

[0008] The raw materials for preparing the core material of the bird-repellent essential oil microcapsules include, by weight: 60-75 parts of phenyl o-hydroxybenzoate, 25-30 parts of ethanol extract of grapefruit peel, 5-10 parts of ethanol extract of cinnamon bark, 3-5 parts of civetone, 8-15 parts of quercetin, and 1.5-2.5 parts of dibutylhydroxytoluene.

[0009] The ethanol extracts of grapefruit peel and cinnamon bark can be obtained by using the conventional organic solvent extraction method in the prior art.

[0010] In the research process of the present invention, it is found that the birds that cause bird damage to silicone rubber composite insulators generally include raptors such as eagles and vultures; corvids such as crows and magpies; pigeons or woodpeckers, etc. And the bird damage methods of these birds to silicone rubber composite insulators are also different. Some are perching and scratching, some are pecking, and some are building nests and perching, all of which will cause mechanical damage, flashover or short circuit problems to the silicone rubber composite insulators.

[0011] In order to enable the bird-repellent effect to cover all the above birds and various bird damage behaviors, the present invention has conducted a large number of repeated studies and observations on the living habits of the above birds, and found that the substances volatilized by the bird-repellent essential oil microcapsules obtained by mixing phenyl o-hydroxybenzoate, ethanol extract of grapefruit peel, ethanol extract of cinnamon bark, civetone and quercetin in the above ratios can drive away eagles, vultures and pigeons. After woodpeckers, crows and magpies peck at the bird-repellent silicone rubber composite insulators of the present invention, they immediately show vomiting and anorectic reactions, so that they will not come again during the memory period, realizing effective repulsion.

[0012] The composition analysis of the heat-cured silicone rubber containing bird-repellent essential oil microcapsules was carried out by gas chromatography-mass spectrometry (GC-MS). The specific operation is as follows: (1) Sample pretreatment: The heat-cured silicone rubber containing bird-repellent essential oil microcapsules was cryogenically embrittled by liquid nitrogen and then ground into fine particles to destroy the microcapsule structure and release the essential oil.

[0013] (2) Solvent extraction: The crushed sample was soaked in n-hexane, ultrasonically assisted extraction was carried out for 60 minutes, and the supernatant was centrifuged and concentrated to obtain a test sample.

[0014] (3) Gas chromatography-mass spectrometry (GC-MS) injection analysis was carried out; among them, the chromatographic column: DB-5MS (30m×0.25mm×0.25μm); ion source: EI (70eV); scanning range: 35-500m / z.

[0015] The analysis results show that its components contain methyl o-hydroxybenzoate, methyl anthranilate, D-limonene, linalool, citral, naringin, cinnamaldehyde, cinnamic acid, civetone and quercetin.

[0016] Phenyl salicylate has aromaticity and can stimulate the mucous membranes of birds, prompting them to avoid it. Moreover, the presence of phenyl salicylate can play a photo-stabilizing role, making the essential oil have excellent photo-stability.

[0017] Irritating odors such as D-limonene, linalool, and citral that interfere with the sense of smell of birds, and naringin as a bitter component, make birds feel disgusted after pecking.

[0018] Cinnamaldehyde and cinnamic acid, components with strong stimulating effects on the sense of smell and taste of birds, will cause discomfort, so they will avoid this area, achieving the purpose of bird repelling.

[0019] The special odor emitted by civetone can affect the nervous system or respiratory system of birds, making them feel uncomfortable and stay away from this area.

[0020] Quercitrin has a bitter taste, and birds will avoid this area due to their aversion to bitterness.

[0021] Although each of the above components can individually produce volatile substances with bird-repelling effects, during the research process, it was found that when these volatile substances are mixed together, if the proportion is unbalanced, it will instead weaken the bird-repelling effect. The specific mechanism is still unclear. It is speculated that it may be due to certain mutual influences among the odors of the volatile substances. Therefore, through a large number of bird-repelling experiment tests under simulated actual application environments, the present invention has obtained that the bird-repelling silicone rubber composite insulator obtained according to the above proportion relationship has excellent bird-repelling effects.

[0022] In the present invention, for the bird-repelling silicone rubber composite insulator, the particle size of the bird-repelling essential oil microcapsules it contains is 20 - 30 μm, and the wall material thickness is 3.5 - 5.5 μm. The particle size of the bird-repelling essential oil microcapsules is measured by a laser particle size analyzer.

[0023] After achieving the bird-repelling effect, it is certainly hoped that the repelling timeliness is as long as possible, and it is expected that the bird-repelling essential oil microcapsules can be evenly distributed in the heat-vulcanized silicone rubber to avoid the existence of repelling dead corners in the formed bird-repelling silicone rubber composite insulator.

[0024] Therefore, it has been found through research that when the particle size of the bird-repelling essential oil microcapsules is 20 - 30 μm and the wall material thickness is 3.5 - 5.5 μm, it not only has a good slow-release effect but also is beneficial to the distribution of the bird-repelling essential oil microcapsules in the heat-vulcanized silicone rubber.

[0025] If the particle size of the bird-repelling essential oil microcapsules is too small, it is extremely easy to agglomerate, which is not conducive to the distribution of the microcapsules in the heat-vulcanized silicone rubber; if the particle size of the bird-repelling essential oil microcapsules is too large, it will affect the original mechanical properties of the heat-vulcanized silicone rubber. And if the wall material thickness is too thick, it is not conducive to the volatilization of the bird-repelling essential oil, and if the wall material is too thin, the shell structure of the bird-repelling essential oil microcapsules is easily damaged, which is not conducive to the subsequent mixing with the mixed rubber.

[0026] In the present invention, in the anti-bird silicone rubber composite insulator, the addition amount of the anti-bird essential oil microcapsules is 1.5% - 4% of the mass of the raw rubber silicone rubber.

[0027] Research has found that when the addition amount of the anti-bird essential oil microcapsules is 1.5% - 4% of the mass of the raw rubber silicone rubber, it can further ensure the distribution of the anti-bird essential oil microcapsules in the heat-cured silicone rubber, and avoid the occurrence of repellent dead angles in the formed anti-bird silicone rubber composite insulator. More importantly, controlling the addition amount of the anti-bird essential oil microcapsules within 1.5% - 4% of the mass of the raw rubber silicone rubber can not only achieve the anti-bird effect without affecting the original mechanical properties of the heat-cured silicone rubber, but also increase the elongation at break of the external insulation material by 17% - 32%.

[0028] In the present invention, in the anti-bird silicone rubber composite insulator, the anti-bird essential oil microcapsules are prepared through the following steps: (1) Preparation of the core material: Add the raw materials phenyl salicylate, ethanol extract of grapefruit peel, ethanol extract of cinnamon bark, civetone, quercetin, and dibutylhydroxytoluene into an ethanol solution with a concentration of 95wt% in sequence according to the weight parts for dissolution to obtain an anti-bird essential oil with a concentration of 80 - 90wt%.

[0029] (2) Preparation of the essential oil microcapsules: Weigh ethyl cellulose and dissolve it in ethyl acetate to form a homogeneous ethyl cellulose ethyl acetate solution; Under magnetic stirring, weigh the anti-bird essential oil and Span80 according to the weight ratio of 1 - 1.5:1, and add them to the obtained ethyl cellulose ethyl acetate solution to form a primary emulsion. Span 80 (sorbitan monooleate), also known as oleic acid sorbitan, is a non-ionic surfactant.

[0030] Disperse the primary emulsion into an aqueous phase composed of 3.5 - 4wt% gelatin and 2.5 - 3wt% sodium dodecyl sulfate, and stir to form a mixed solution.

[0031] Continue to stir at 80 - 85°C for 6 - 7h to solidify and form microcapsules.

[0032] Perform vacuum filtration to separate the microcapsules and dry them.

[0033] In the present invention, in the anti-bird silicone rubber composite insulator, the mass ratio of ethyl cellulose to anti-bird essential oil in the anti-bird essential oil microcapsules is 8 - 10:1.

[0034] In the present invention, for the bird-repellent silicone rubber composite insulator, the raw materials of the heat-curable silicone rubber include, by weight: 100 parts of silicone rubber, 40-50 parts of white carbon black, 7-9 parts of phenyl silicone oil, 3-5 parts of diphenyl dimethoxysilane, and 1-2 parts of 2,4-dichlorobenzoyl peroxide.

[0035] The preparation method of the above-mentioned bird-repellent silicone rubber composite insulator includes the following steps: Take silicone rubber, white carbon black, phenyl silicone oil and diphenyl dimethoxysilane, and knead to obtain a kneaded rubber. Add 2,4-dichlorobenzoyl peroxide and bird-repellent essential oil microcapsules to the kneaded rubber, and open mill to obtain silicone rubber containing bird-repellent essential oil microcapsules. Vulcanize and mold the silicone rubber containing bird-repellent essential oil microcapsules with the core rod to obtain a semi-finished insulator. Apply sealant to the inner end of the semi-finished insulator, then insert the metal fitting into the semi-finished insulator, and use a crimping device for crimping to obtain the bird-repellent silicone rubber composite insulator.

[0036] During the preparation process, bird-repellent essential oil microcapsules are added to the kneaded rubber. After being extruded and sheared in an open mill for a period of time, they will be evenly distributed in the kneaded rubber together with the vulcanizing agent. Then, through the vulcanization reaction process, the vulcanizing agent tightly combines with the silicon-oxygen bonds in the silicone rubber to form a network structure that encloses the bird-repellent essential oil microcapsules. Among them, 2,4-dichlorobenzoyl peroxide is selected as the vulcanizing agent, which has the characteristics of low-temperature and rapid vulcanization. In the vulcanization of silicone rubber, the vulcanization temperature range is 100-120°C. The vulcanization temperature is lower than the softening temperature of the wall material of the bird-repellent essential oil microcapsules, and will not affect the bird-repellent essential oil microcapsules.

[0037] The application of the above-mentioned bird-repellent silicone rubber composite insulator in a 10-500 KV transmission line.

[0038] The beneficial effects of the present invention are as follows: On the basis of the preparation of ordinary silicone rubber composite insulators, the bird-repellent (anti-bird pecking, anti-nesting, anti-bird approaching) silicone rubber composite insulator of the present invention adds bird-repellent essential oil microcapsules, thereby endowing it with a bird-pecking prevention function different from that of ordinary insulators.

[0039] The essential oil component in the bird-repellent essential oil microcapsules of the present invention will cause an allergic reaction to the trigeminal nerve of the bird's brain when smelled by the bird; if pecked, it will cause an anorexic reaction to the esophageal nerve of the bird, so that it will not come again within the memory period, effectively driving away the bird without harming it.

[0040] Therefore, the bird-repellent method of the bird-repellent silicone rubber composite insulator is the combined action of two methods: First, the bird-repellent essential oil microcapsules slowly release volatile substances that have a strong stimulating effect on the smell and taste of birds, which will cause an allergic reaction to their trigeminal nerves, making the birds feel uncomfortable, so as to avoid this area and achieve the purpose of bird repellent. Second, the bird-repellent essential oil microcapsules also contain components that cause disgust after being pecked by birds. If a certain type of bird is not avoidant of the smell, it will immediately vomit when it pecks the silicone rubber, resulting in an anorexic reaction, so that it will not come again during the memory period, effectively driving it away. The combined action of the two bird-repellent methods fundamentally solves the insulator flashover accident caused by bird attacks on existing lines.

[0041] Through the slow-release mathematical model curve and equation fitting, it can be calculated that the time required for cumulative release of 50% can be as long as 5 - 7 years. Specific embodiments

[0042] The technical solutions of the present invention will be described in detail below.

[0043] 1. The ethanol extract of grapefruit peel described in the specific embodiment is obtained through the following steps: Wash, dry, and crush the grapefruit peel to 45 mesh; add ethanol with a concentration of 95wt% according to a material-liquid ratio of 1:10 (w / v), and extract for 30 minutes at 45°C under ultrasonic conditions of 200W to obtain an extract; centrifuge and filter the extract, and collect the filtrate; finally, rotary evaporate the filtrate at 40°C to obtain a concentrated liquid containing essential oil; mix the concentrated liquid with distilled water at a ratio of 1:1, and perform steam distillation (100°C), and collect the distillate.

[0044] 2. The ethanol extract of cinnamon bark described in the specific embodiment is obtained through the following steps: Wash, dry, and crush the cinnamon bark to 50 mesh; add ethanol with a concentration of 95wt% according to a material-liquid ratio of 1:20 (w / v), and extract for 60 minutes at 55°C under ultrasonic conditions of 300W to obtain an extract; centrifuge and filter the extract, and collect the filtrate; finally, rotary evaporate the filtrate at 50°C to obtain a concentrated liquid containing essential oil; mix the concentrated liquid with distilled water at a ratio of 1:1, and perform steam distillation (100°C), and collect the distillate.

[0045] 3. The bird-repellent essential oil microcapsules described in the specific embodiment are prepared through the following steps: (1) Prepare the core material: Add the raw materials phenyl salicylate, ethanol extract of grapefruit peel, ethanol extract of cinnamon bark, civetone, quercetin, and dibutylhydroxytoluene to an ethanol solution with a concentration of 95wt% in sequence according to the weight parts for dissolution to obtain a bird-repellent essential oil with a concentration of 90wt%.

[0046] (2) Prepare the essential oil microcapsules: Weigh ethyl cellulose and dissolve it in ethyl acetate to form a homogeneous ethyl acetate solution of ethyl cellulose.

[0047] Under magnetic stirring, take bird-repellent essential oil and Span80 in a ratio of 1.5:1 and add them to the obtained ethyl acetate solution of ethyl cellulose to form a primary emulsion.

[0048] Disperse the primary emulsion into an aqueous phase composed of 4 wt% gelatin and 3 wt% sodium dodecyl sulfate, and stir to form a mixed solution.

[0049] At 85 °C, continue stirring for 7 h to solidify and form microcapsules.

[0050] Perform vacuum filtration to separate the microcapsules and dry them.

[0051] The preparation method of the bird-repellent silicone rubber composite insulator described in the specific implementation manner is as follows: Weigh silicone rubber, fumed silica, phenyl silicone oil, and diphenyldimethoxysilane by weight, and knead to obtain a kneaded rubber. Add benzoyl peroxide dichloride and bird-repellent essential oil microcapsules to the kneaded rubber, and open mill to obtain silicone rubber containing bird-repellent essential oil microcapsules. Vulcanize and mold the silicone rubber containing bird-repellent essential oil microcapsules and the core rod at 120 °C to obtain a semi-finished insulator. Apply a sealant to the inner end of the semi-finished insulator, then insert the metal fitting into the semi-finished insulator, and use a crimping device for crimping to obtain the described bird-repellent silicone rubber composite insulator. Example 1

[0052] In the described bird-repellent silicone rubber composite insulator, bird-repellent essential oil microcapsules are uniformly distributed in the heat-vulcanized silicone rubber as the outer insulation material.

[0053] The raw materials for preparing the core material of the bird-repellent essential oil microcapsules include, by weight: 60 parts of phenyl salicylate, 30 parts of ethanol extract of grapefruit peel, 10 parts of ethanol extract of cinnamon bark, 3 parts of civetone, 15 parts of quercetin, and 1.5 parts of dibutylhydroxytoluene.

[0054] The raw materials of the heat-vulcanized silicone rubber include, by weight: 100 parts of silicone rubber, 45 parts of fumed silica, 8 parts of phenyl silicone oil, 5 parts of diphenyldimethoxysilane, and 1.5 parts of benzoyl peroxide dichloride.

[0055] The addition amount of the bird-repellent essential oil microcapsules is 2% of the mass of the raw rubber silicone rubber.

[0056] In the described bird-repellent essential oil microcapsules, the mass ratio of the wall material ethyl cellulose to the core material bird-repellent essential oil is 8:1.

[0057] The particle size of the bird-repellent essential oil microcapsules is 25 μm, and the wall material thickness is 4 μm.

[0058] Weigh 5 mg of the heat-vulcanized silicone rubber containing bird-repellent essential oil microcapsules obtained in this example, place it in a dialysis bag, add it to 50 mL of phosphate buffer solution (pH = 7.4), and oscillate it at a constant temperature and constant speed of 150 r / min at 37°C. Take 3 mL of samples regularly every day for detection, and add phosphate buffer solution in time after sampling. The cumulative release amount (%) at each time point was calculated by high performance liquid chromatography. The Higuchi kinetic model was selected using Origin software, and the cumulative release amount F(t) and time t (days) were fitted to obtain: Higuchi equation F(t) = 1.269t 1 / 2 -9.3815, r = 0.9965.

[0059] When the cumulative release amount F(t) = 50, by calculating through the equation, the required time is 6 years.

[0060] Next, a bird-repellent experiment was carried out on Example 1 I. Experimental purpose: Conduct a bird-repellent experiment on the bird-repellent silicone rubber composite insulator obtained in Example 1.

[0061] II. Experimental method: Combining with the actual environment of the transmission line, it was divided into 2 areas with an interval of 10 meters between the areas. In one area, the bird-repellent silicone rubber composite insulator described in Example 1 was used as the experimental group; in the other area, an ordinary silicone rubber composite insulator was used as the control group.

[0062] Before the experimental monitoring, the same number and same species of birds were released in each area: 5 crows, 5 magpies, 5 pigeons, and 5 woodpeckers. The birds were not fed one day in advance. Observe the activities of the birds and record them.

[0063] III. Experimental results: Table 1 Select part of the experimental group results

[0064] Table 2 Control group results Example 2

[0065] The difference from Example 1 is that the raw materials for preparing the core material of the bird-repellent essential oil microcapsules include, by weight: 75 parts of phenyl salicylate, 25 parts of ethanol extract of grapefruit peel, 5 parts of ethanol extract of cinnamon bark, 5 parts of civetone, 8 parts of quercetin, and 2.5 parts of dibutylhydroxytoluene.

[0066] The addition amount of the bird-repellent essential oil microcapsules is 3% of the mass of the raw rubber silicone rubber.

[0067] The others are the same as in Example 1.

[0068] The bird repelling experiment on Example 2 is carried out as follows. I. Experiment purpose: Conduct a bird repelling experiment on the bird repelling silicone rubber composite insulator obtained in Example 2.

[0069] II. Experiment method: Combining with the actual environment of the transmission line, it is divided into 2 areas with an interval of 10 meters between the areas. In one area, the bird repelling silicone rubber composite insulator described in Example 2 is used as the experimental group; in the other area, an ordinary silicone rubber composite insulator is used as the control group.

[0070] Before the experiment monitoring, the same number and same variety of birds are released in each area: 5 crows, 5 magpies, 5 pigeons and 5 woodpeckers. The birds are not fed one day in advance. Observe the activities of the birds and record.

[0071] III. Experiment results: Table 3 Select partial results of the experimental group

[0072] Table 4 Results of the control group

[0073] Example 3 The difference from Example 1 is that the mass ratio of the wall material ethyl cellulose to the core material bird repelling essential oil in the bird repelling essential oil microcapsule is 10:1.

[0074] The addition amount of the bird repelling essential oil microcapsule is 4% of the mass of the raw rubber silicone rubber.

[0075] The particle size of the bird repelling essential oil microcapsule is 30 μm, and the wall thickness is 5.5 μm.

[0076] The others are the same as in Example 1.

[0077] Refer to the method described in Example 1 to obtain the Higuchi equation F(t) = 1.073t 1 / 2 - 6.1394, r = 0.9986.

[0078] When the cumulative release amount F(t) = 50, through equation calculation, the required time is 7.5 years. Example 4

[0079] The raw material for preparing the core material of the bird repelling essential oil microcapsule includes by weight: 65 parts of phenyl salicylate, 25 parts of ethanol extract of grapefruit peel, 8 parts of ethanol extract of cinnamon bark, 4 parts of civetone, 10 parts of quercetin and 2 parts of dibutylhydroxytoluene.

[0080] The raw materials of the thermosulfurized silicone rubber include, by weight: 100 parts of silicone rubber, 50 parts of fumed silica, 7 parts of phenyl silicone oil, 3 parts of diphenyldimethoxysilane, and 1.2 parts of benzoyl peroxide.

[0081] The addition amount of the bird-repellent essential oil microcapsules is 1.5% of the mass of the raw rubber silicone rubber.

[0082] In the bird-repellent essential oil microcapsules, the mass ratio of the wall material ethyl cellulose to the core material bird-repellent essential oil is 8:1.

[0083] The particle size of the bird-repellent essential oil microcapsules is 20 μm, and the thickness of the wall material is 3.5 μm.

[0084] Referring to the method described in Example 1, the Higuchi equation F(t) = 1.366t 1 / 2 -8.3374, r = 0.9937.

[0085] When the cumulative release amount F(t) = 50, the required time is calculated by the equation to be 5 years.

[0086] The bird-repellent experiment on Example 4 is carried out below I. Experiment purpose: Conduct a bird-repellent experiment on the bird-repellent silicone rubber composite insulator obtained in Example 4.

[0087] II. Experiment method: Combining the actual environment of the transmission line, it is divided into 2 areas with an interval of 10 meters. In one area, the bird-repellent silicone rubber composite insulator described in Example 4 is used as the experimental group; in the other area, an ordinary silicone rubber composite insulator is used as the control group.

[0088] Before the experimental monitoring, the same number and the same variety of birds are released in each area: 5 crows, 5 magpies, 5 pigeons, and 5 woodpeckers. The birds are not fed one day in advance. Observe the activities of the birds and record.

[0089] III. Experiment results: Table 5 selects partial results of the experimental group

[0090] Table 6 control group results

[0091] Comparative Example 1 The difference from Example 1 is that the raw material of the core material of the bird-repellent essential oil microcapsules in this comparative example includes, by weight: 40 parts of phenyl salicylate, 45 parts of ethanol extract of grapefruit peel, 15 parts of ethanol extract of cinnamon bark, 3 parts of civetone, 15 parts of quercetin, and 1.5 parts of dibutylhydroxytoluene.

[0092] The anti-bird experiment on Comparative Example 1 will be carried out below. I. Experimental purpose: Conduct an anti-bird experiment on the anti-bird silicone rubber composite insulator obtained in Comparative Example 1.

[0093] II. Experimental method: Combining with the actual environment of the transmission line, it is divided into 2 areas with an interval of 10 meters between the areas. In one area, the anti-bird silicone rubber composite insulator described in Comparative Example 1 is used as the experimental group; in the other area, an ordinary silicone rubber composite insulator is used as the control group.

[0094] Before the experimental monitoring, the same number and the same variety of birds are released in each area: 5 crows, 5 magpies, 5 pigeons and 5 woodpeckers. The birds are not fed one day in advance. Observe the activities of the birds and record them.

[0095] III. Experimental results: Table 7 Select part of the experimental group results

[0096] Table 8 Control group results

[0097] Comparative Example 2 The difference from Example 1 is that the raw materials for preparing the core material of the anti-bird essential oil microcapsule in this comparative example include, by weight: 50 parts of phenyl salicylate, 25 parts of ethanol extract of grapefruit peel, 3 parts of ethanol extract of cinnamon bark, 15 parts of civetone, 25 parts of quercetin and 1.5 parts of dibutylhydroxytoluene.

[0098] The anti-bird experiment on Comparative Example 2 will be carried out below. I. Experimental purpose: Conduct an anti-bird experiment on the anti-bird silicone rubber composite insulator obtained in Comparative Example 2.

[0099] II. Experimental method: Combining with the actual environment of the transmission line, it is divided into 2 areas with an interval of 10 meters between the areas. In one area, the anti-bird silicone rubber composite insulator described in Comparative Example 2 is used as the experimental group; in the other area, an ordinary silicone rubber composite insulator is used as the control group.

[0100] Before the experimental monitoring, the same number and the same variety of birds are released in each area: 5 crows, 5 magpies, 5 pigeons and 5 woodpeckers. The birds are not fed one day in advance. Observe the activities of the birds and record them.

[0101] III. Experimental results: Table 9 Select part of the experimental group results

[0102] Table 10 Control group results

[0103] Comparative Example 3 The difference from Example 1 is that the particle size of the bird-repellent essential oil microcapsules in this comparative example is 50 μm.

[0104] Comparative Example 4

[0105] The difference from Example 1 is that the addition amount of the bird-repellent essential oil microcapsules in this comparative example is 8% of the mass of the raw rubber silicone rubber.

[0106] Comparative Example 5

[0107] The difference from Example 1 is that this comparative example is a heat-vulcanized silicone rubber without bird-repellent essential oil microcapsules.

[0108] The mechanical properties of the heat-vulcanized silicone rubbers containing bird-repellent essential oil microcapsules obtained in Examples 1-4 and Comparative Examples 1-5 were tested, and the test results are shown in Table 11 below.

[0109] Table 11

Claims

1. A bird-repellent silicone rubber composite insulator, characterized in that, The outer insulating material, heat-vulcanized silicone rubber, has bird-repellent essential oil microcapsules evenly distributed in it; The raw materials for preparing the core material of the bird-repellent essential oil microcapsule include, by weight: 60-75 parts of phenyl o-hydroxybenzoate, 25-30 parts of grapefruit peel ethanol extract, 5-10 parts of cinnamon bark ethanol extract, 3-5 parts of civetone, 8-15 parts of quercetin and 1.5-2.5 parts of butylated hydroxytoluene.

2. The anti-bird silicon rubber composite insulator according to claim 1, wherein The particle size of the bird-repellent essential oil microcapsules is 20-30 μm, wherein the thickness of the wall material is 3.5-5.5 μm.

3. The anti-bird silicon rubber composite insulator according to claim 1, wherein The added amount of the bird-repellent essential oil microcapsules is 1.5%-4% of the mass of the raw silicone rubber.

4. The anti-bird silicon rubber composite insulator according to claim 1, characterized in that, The bird-repellent essential oil microcapsules are prepared by the following steps: (1) Preparing a core material: adding the raw materials phenyl o-hydroxybenzoate, grapefruit peel ethanol extract, cinnamon bark ethanol extract, civetone, quercetin and butylated hydroxytoluene in parts by weight in sequence to a 95 wt % ethanol solution for dissolution to obtain a bird repellent essential oil with a concentration of 80-90 wt %; (2) Preparation of essential oil microcapsules: Weigh ethyl cellulose and dissolve it in ethyl acetate to form a uniform ethyl cellulose ethyl acetate solution; Under magnetic stirring, weigh bird-repellent essential oil and Span80 in a weight ratio of 1-1.5:1, and add them to the obtained ethyl cellulose ethyl acetate solution to form colostrum; Dispersing colostrum into an aqueous phase consisting of 3.5-4wt% gelatin and 2.5-3wt% sodium lauryl sulfate, stirring to form a mixed solution; Continue stirring at 80-85°C for 6-7 hours to solidify and form microcapsules; The microcapsules were separated by filtration under reduced pressure and dried.

5. The anti-bird silicon rubber composite insulator according to claim 1, characterized in that, The mass ratio of ethyl cellulose to bird-repellent essential oil in the bird-repellent essential oil microcapsules is 8-10:

1.

6. The anti-bird silicon rubber composite insulator according to claim 1, characterized in that, The raw materials of the heat-vulcanized silicone rubber include, by weight: 100 parts of silicone rubber, 40-50 parts of white carbon black, 7-9 parts of phenyl silicone oil, 3-5 parts of diphenyldimethoxysilane, and 1-2 parts of 2,4-dichlorobenzoyl peroxide.

7. A method for preparing a bird-repellent silicone rubber composite insulator according to any one of claims 1-6, characterized in that, The following steps are involved: Silicone rubber, white carbon black, phenyl silicone oil and diphenyl dimethoxy silane are mixed to prepare a rubber compound; 2,4-dichlorobenzoyl peroxide and bird-repellent essential oil microcapsules are added into the mixed rubber, and the silicone rubber containing bird-repellent essential oil microcapsules is obtained after refining. vulcanizing the silicone rubber containing the bird-repellent essential oil microcapsules and the core rod to obtain a semi-finished insulator; The inner end of the semi-finished insulator is coated with sealant, and then a metal fitting is inserted into the semi-finished insulator, and a pressing device is used for crimping to obtain the bird-repelling silicone rubber composite insulator.

8. Use of the bird-repellent silicone rubber composite insulator according to any one of claims 1 to 6 in a 10-500KV transmission line.

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