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

Abstract

The application 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. The bird-repellent silicone rubber composite insulator is characterized in that bird-repellent essential oil microcapsules are uniformly distributed in the heat vulcanized silicone rubber of the outer insulation material. The raw materials of the core material of the bird-repellent essential oil microcapsules include, by weight, phenyl o-hydroxybenzoate, grapefruit peel ethanol extract, cinnamon bark ethanol extract, civetone, quercitrin and dibutyl hydroxytoluene. The bird-repellent essential oil microcapsules are added in the silicone rubber mixing process of the existing silicone rubber composite insulator, so that the existing ordinary silicone rubber composite insulator is endowed with good endogenous bird-repellent function, has broad-spectrum repellence, and has long repellence timeliness, which can be more than 10 years.

Description

TECHNICAL FIELD

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

[0002] The silicone rubber composite insulator is composed of an outer insulation material silicone rubber, a glass fiber reinforced core rod and a metal end accessory, has good adaptability in the operation of overhead transmission lines, and gradually becomes a preferred product for replacing porcelain (glass) insulators, is widely applied to high-performance insulation equipment of power systems, and particularly in the fields of high-voltage transmission lines, transformer substations and electrified railways, and the application ratio of the composite insulator in overhead transmission lines reaches more than 80%.

[0003] With the wide application of the silicone rubber composite insulator, the silicone rubber composite insulator also faces a serious bird hazard problem. The bird hazard to the silicone rubber composite insulator mainly manifests in behaviors such as pecking, inhabiting or excreting, which leads to inter-phase short circuit and flashover accidents, and becomes a main cause of accidents that seriously endanger the safe operation of power grids. The loss caused by bird hazards of transmission and transformation lines is more than 10 billion yuan per year.

[0004] At present, the methods for preventing bird hazards mainly include installing bird-preventing thorns, bird-repelling mirrors, bird-repelling windmills, voice bird-repelling devices, ultrasonic bird-repelling devices, drug-type bird-repelling devices and the like. These methods for preventing (treating) birds all belong to exogenous methods, and it is difficult to fundamentally solve the bird hazard problem.

[0005] Patent CN101864171B discloses a preparation method of a bird-repellent silicone rubber composite insulator. Although the scheme essentially belongs to an endogenous bird-repelling method, and can solve the bird hazard problem of transmission and transformation lines to a certain extent, the repelling effective substance and repelling mechanism adopted are too single, and only the smell that birds hate is released to achieve the purpose of repelling birds. Thus, only some birds can be repelled. In addition, the repelling time efficiency of the bird-repellent silicone rubber composite insulator is short, only about 3 years. SUMMARY

[0006] The present application aims at the above-mentioned defects, and provides a bird-repellent silicone rubber composite insulator and a preparation method and application thereof. The bird-repellent silicone rubber composite insulator is prepared by adding bird-repellent essential oil microcapsules in the silicone rubber mixing process by using the existing production technology of the silicone rubber composite insulator, so that the existing ordinary silicone rubber composite insulator has good endogenous bird-repelling function, has broad-spectrum repelling, and has long repelling time efficiency, which can reach more than 10 years.

[0007] The technical scheme of the present application is as follows:

[0008] A bird-repellent silicone rubber composite insulator, wherein bird-repellent essential oil microcapsules are uniformly distributed in a heat vulcanized silicone rubber serving as an outer insulation material.

[0009] 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 caracol, 8-15 parts of quercitrin, and 1.5-2.5 parts of dibutyl hydroxytoluene.

[0010] The grapefruit peel ethanol extract and the cinnamon bark ethanol extract can be obtained by using the conventional organic solvent extraction method in the prior art.

[0011] It is found in the research process of the present application that the birds causing bird damage to the silicone rubber composite insulator at present generally include hawks, eagles and other birds of prey, crows, magpies and other corvids, pigeons or woodpeckers, etc. These birds have different ways of causing bird damage to the silicone rubber composite insulator, some of which are perching and scratching, some of which are pecking and eating, and some of which are nesting and perching, all of which can cause mechanical damage, flashover or short circuit, etc. to the silicone rubber composite insulator.

[0012] In order to enable the bird repellent effect to cover all the above-mentioned birds and various bird damage behaviors, the present application is obtained by a large number of repeated researches and observations on the living habits of the above-mentioned birds, and it is found that the substances volatilized from the bird repellent essential oil microcapsule obtained by the above-mentioned proportioning of phenyl o-hydroxybenzoate, grapefruit peel ethanol extract, cinnamon bark ethanol extract, caracol and quercitrin play a driving role on hawks, eagles and pigeons, and woodpeckers, crows and magpies immediately show vomiting phenomenon and produce anorexia reaction after pecking and eating the bird repellent silicone rubber composite insulator of the present application, so that they will not come again in the memory period, thereby achieving effective driving.

[0013] The hot vulcanized type silicone rubber containing the bird repellent essential oil microcapsule is subjected to component analysis by using gas chromatography-mass spectrometry (GC-MS), and the specific operation is as follows:

[0014] (1) Sample pretreatment: the hot vulcanized type silicone rubber containing the bird repellent essential oil microcapsule is frozen and crumbled by liquid nitrogen, ground into fine particles, and the microcapsule structure is destroyed to release the essential oil.

[0015] (2) Solvent extraction: the broken sample is soaked with n-hexane, ultrasonic assisted extraction is performed for 60 minutes, and the supernatant is obtained by centrifugation and concentrated; the sample is obtained.

[0016] (3) GC-MS is used for sample analysis; the chromatographic column is DB-5MS (30m x 0.25mm x 0.25μm); the ion source is EI (70eV); and the scanning range is 35-500m / z.

[0017] The analysis result shows that the components include methyl o-hydroxybenzoate, methyl o-aminobenzoate, D-limonene, linalool, citral, naringin, cinnamic aldehyde, cinnamic acid, caracol and quercitrin.

[0018] Phenyl o-hydroxybenzoate has aromaticity and can stimulate the mucous membrane of birds, so that the birds avoid it. Moreover, phenyl o-hydroxybenzoate can play a light stabilizing role, so that the essential oil has excellent light stability.

[0019] D-limonene, linalool and citral have stimulating smell that interferes with the sense of smell of birds, and naringin is a bitter component, so that the birds produce aversion after pecking.

[0020] Cinnamyl aldehyde and cinnamic acid are components with strong stimulating effect on the sense of smell and taste of birds, which can produce discomfort and thus avoid the area to achieve the purpose of bird repelling.

[0021] The special smell of genetone can affect the nervous system or respiratory system of birds, so that the birds produce discomfort and avoid the area.

[0022] Quercitrin has a bitter taste, and birds will avoid the area due to aversion to bitter taste.

[0023] Although each component can produce volatile substances with bird repelling effect alone, it is found in the research process that when these volatile substances are mixed together, the bird repelling effect will be weakened if the ratio is unbalanced, and the specific mechanism is not clear. It is speculated that there may be certain mutual influence between the smells of volatile substances. Therefore, through a large number of bird repelling experiments in simulated actual application environment, it is found that the bird repelling silicone rubber composite insulator obtained according to the above ratio has excellent bird repelling effect.

[0024] In the present application, the bird repelling silicone rubber composite insulator contains bird repelling essential oil microcapsules with a particle size of 20-30 μm, and the wall material has a thickness of 3.5-5.5 μm. The particle size of the bird repelling essential oil microcapsules is measured by a laser particle size instrument.

[0025] After achieving the bird repelling effect, it is certainly desirable that the repelling time is as long as possible, and it is also desirable that the bird repelling essential oil microcapsules are uniformly distributed in the heat vulcanized silicone rubber to avoid dead angles in the bird repelling silicone rubber composite insulator after molding.

[0026] Therefore, it is found that when the particle size of the bird repelling essential oil microcapsules is 20-30 μm and the thickness of the wall material is 3.5-5.5 μm, 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.

[0027] If the particle size of the bird repellent essential oil microcapsule is too small, it is easy to agglomerate, which is not conducive to the distribution of the microcapsule in the heat vulcanized silicone rubber; if the particle size of the bird repellent essential oil microcapsule is too large, it will affect the original mechanical properties of the heat vulcanized silicone rubber. If the wall material is too thick, it is not conducive to the volatilization of the bird repellent essential oil, and if the wall material is too thin, the shell structure of the bird repellent essential oil microcapsule is easily damaged, which is not conducive to the subsequent mixing with the rubber compound.

[0028] In the present application, the bird repellent silicone rubber composite insulator has the bird repellent essential oil microcapsule added in an amount of 1.5%-4% of the mass of the raw rubber silicone rubber.

[0029] Research has found that when the amount of bird repellent essential oil microcapsule added is 1.5%-4% of the mass of raw rubber silicone rubber, the distribution of bird repellent essential oil microcapsule in heat vulcanized silicone rubber can be further ensured, and the bird repellent silicone rubber composite insulator after molding can avoid the occurrence of repellent dead angle. More importantly, by controlling the amount of bird repellent essential oil microcapsule added to be 1.5%-4% of the mass of raw rubber silicone rubber, the bird repellent effect can be achieved, and not only the original mechanical properties of the heat vulcanized silicone rubber are not affected, but also the elongation at break of the external insulation material is improved by 17%-32%.

[0030] In the present application, the bird repellent silicone rubber composite insulator has the bird repellent essential oil microcapsule prepared by the following steps:

[0031] (1) Preparation of core material: raw materials phenyl o-hydroxybenzoate, grapefruit peel ethanol extract, cinnamon bark ethanol extract, civetone, quercetin and dibutyl hydroxytoluene are sequentially added to a 95wt% ethanol solution for dissolution to obtain a bird repellent essential oil with a concentration of 80-90wt%.

[0032] (2) Preparation of essential oil microcapsule:

[0033] Ethyl cellulose is weighed and dissolved in ethyl acetate to form a uniform ethyl cellulose ethyl acetate solution;

[0034] Under magnetic stirring, bird repellent essential oil and Span 80 are weighed in a weight ratio of 1-1.5:1 and added to the obtained ethyl cellulose ethyl acetate solution to form a primary emulsion. Span 80 (Span 80) is sorbitan monoleate, also known as sorbitan monoleate, which is a non-ionic surfactant.

[0035] The primary emulsion is dispersed into an aqueous phase composed of 3.5-4wt% gelatin and 2.5-3wt% sodium dodecyl sulfate, stirred to form a mixed solution.

[0036] Continue to stir at 80-85℃ for 6-7h, solidify to form microcapsules.

[0037] Reduce pressure and filter, separate the microcapsules and dry.

[0038] The bird-repellent silicone rubber composite insulator of the present application has a mass ratio of ethyl cellulose to bird-repellent essential oil in the bird-repellent essential oil microcapsule of 8-10:1.

[0039] The bird-repellent silicone rubber composite insulator of the present application has a heat-vulcanized silicone rubber, the raw materials of which 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.

[0040] The method for preparing the bird-repellent silicone rubber composite insulator includes the following steps:

[0041] The silicone rubber, white carbon black, phenyl silicone oil, and diphenyl dimethoxysilane are mixed and kneaded to obtain a mixed rubber;

[0042] The 2,4-dichlorobenzoyl peroxide and the bird-repellent essential oil microcapsule are added to the mixed rubber, and the mixed rubber is opened and kneaded to obtain the silicone rubber containing the bird-repellent essential oil microcapsule;

[0043] The silicone rubber containing the bird-repellent essential oil microcapsule is vulcanized with a mandrel to form an insulator semi-product;

[0044] The inner end of the insulator semi-product is smeared with a sealing glue, and then a metal fitting is inserted into the insulator semi-product, and the insulator semi-product is pressed by a pressing device to obtain the bird-repellent silicone rubber composite insulator.

[0045] In the preparation process, the bird-repellent essential oil microcapsule is added to the mixed rubber, and after being extruded and sheared in the opening and kneading machine for a period of time, the bird-repellent essential oil microcapsule is uniformly distributed in the mixed rubber together with the vulcanizing agent. During the vulcanization reaction process, the vulcanizing agent is tightly combined with the silicon-oxygen bond in the silicone rubber to form a grid structure that contains the bird-repellent essential oil microcapsule. The vulcanizing agent is 2,4-dichlorobenzoyl peroxide, which has the characteristics of low-temperature rapid vulcanization. In the vulcanization of the silicone rubber, the vulcanization temperature ranges from 100 to 120℃. The vulcanization temperature is lower than the softening temperature of the wall material of the bird-repellent essential oil microcapsule, and does not affect the bird-repellent essential oil microcapsule.

[0046] The bird-repellent silicone rubber composite insulator is applied to 10-500KV power transmission lines.

[0047] The bird-repellent silicone rubber composite insulator of the present application has the advantages that the bird-repellent silicone rubber composite insulator is prepared on the basis of the preparation of ordinary silicone rubber composite insulators, and bird-repellent essential oil microcapsules are added to the silicone rubber composite insulator, thereby endowing the silicone rubber composite insulator with the function of preventing birds from pecking, nesting, and approaching.

[0048] The essential oil component in the bird repellent essential oil microcapsule described in the present application will produce an allergic reaction to the trigeminal nerve of the bird after the bird smells it; if pecked, it will produce an aversion reaction to the esophageal nerve, so that the bird will not come back in the memory period, effectively driving away and not harming the bird.

[0049] Therefore, the bird repellent silicone rubber composite insulator has two common avoidance modes: one is that the bird repellent essential oil microcapsule slowly releases volatile substances that have a strong stimulating effect on the olfactory and gustatory senses of birds, which will produce an allergic reaction to the trigeminal nerve of the bird, making the bird feel uncomfortable and avoiding the area, thereby achieving the purpose of driving away the bird. The second is that the bird repellent essential oil microcapsule also contains components that produce an aversion reaction after being pecked by birds. If a certain bird does not avoid the smell, it will immediately vomit and produce an aversion reaction if it pecks the silicone rubber, so that it will not come back in the memory period, effectively driving away the bird. The common action of the two avoidance modes fundamentally solves the problem of insulator flashover accidents caused by bird invasion of existing lines.

[0050] Through fitting of the slow-release mathematical model curve and equation, it can be calculated that the time required for 50% cumulative release can be as long as 5-7 years. DETAILED DESCRIPTION

[0051] The technical solutions of the present application will be described in detail below.

[0052] 1. The grapefruit peel ethanol extract described in the detailed description is obtained by the following steps: washing, drying, and crushing the grapefruit peel to 45 mesh; adding ethanol with a concentration of 95wt% at a solid-liquid ratio of 1:10 (w / v), extracting for 30 min under the condition of ultrasonic wave 200W at 45℃, to obtain an extract; centrifuging and filtering the extract, and collecting the filtrate; finally, rotary evaporating the filtrate at 40℃ to obtain a concentrated liquid containing essential oil; mixing the concentrated liquid with distilled water at a ratio of 1:1, and performing water vapor distillation (100℃) to collect the distillate.

[0053] 2. The cinnamon bark ethanol extract described in the detailed description is obtained by the following steps: washing, drying, and crushing the cinnamon bark to 50 mesh; adding ethanol with a concentration of 95wt% at a solid-liquid ratio of 1:20 (w / v), extracting for 60 min under the condition of ultrasonic wave 300W at 55℃, to obtain an extract; centrifuging and filtering the extract, and collecting the filtrate; finally, rotary evaporating the filtrate at 50℃ to obtain a concentrated liquid containing essential oil; mixing the concentrated liquid with distilled water at a ratio of 1:1, and performing water vapor distillation (100℃) to collect the distillate.

[0054] 3. The bird repellent essential oil microcapsule described in the detailed description is prepared by the following steps:

[0055] (1) Preparation of core material: raw materials phenyl o-hydroxybenzoate, grapefruit peel ethanol extract, cinnamon bark ethanol extract, geosmin, quercetin and dibutyl hydroxytoluene were added into 95wt% ethanol solution in sequence according to weight parts to dissolve, and a repellent essential oil with a concentration of 90wt% was obtained.

[0056] (2) Preparation of essential oil microcapsule:

[0057] Ethyl cellulose was weighed and dissolved in ethyl acetate to form a uniform ethyl cellulose ethyl acetate solution.

[0058] Under magnetic stirring, the repellent essential oil and Span80 were taken in a proportion of 1.5:1 and added to the obtained ethyl cellulose ethyl acetate solution to form a preliminary emulsion.

[0059] The preliminary emulsion was dispersed into an aqueous phase composed of 4wt% gelatin and 3wt% sodium dodecyl sulfate, and stirred to form a mixed solution.

[0060] The stirring was continued at 85℃ for 7h, and the microcapsules were solidified.

[0061] The microcapsules were separated by vacuum filtration and dried.

[0062] The preparation method of the repellent silicone rubber composite insulator described in the specific embodiment is as follows:

[0063] Silicone rubber, white carbon black, phenyl silicone oil and diphenyl dimethoxy silane were weighed according to weight parts and mixed to prepare a rubber compound;

[0064] 2,4-dichlorobenzoyl peroxide and repellent essential oil microcapsules were added to the rubber compound, and after opening and mixing, a silicone rubber containing repellent essential oil microcapsules was obtained;

[0065] The silicone rubber containing repellent essential oil microcapsules was vulcanized and formed with a mandrel at 120℃ to obtain an insulator semi-finished product;

[0066] The inner end of the insulator semi-finished product was smeared with sealant, and then metal fittings were inserted into the insulator semi-finished product, and pressure bonding device was used for pressure bonding, thereby obtaining the repellent silicone rubber composite insulator. Example 1

[0067] The repellent silicone rubber composite insulator has repellent essential oil microcapsules uniformly distributed in the heat vulcanized silicone rubber of the outer insulating material.

[0068] The raw materials for preparing the core material of the repellent essential oil microcapsule include 60 parts of phenyl o-hydroxybenzoate, 30 parts of grapefruit peel ethanol extract, 10 parts of cinnamon bark ethanol extract, 3 parts of geosmin, 15 parts of quercetin and 1.5 parts of dibutyl hydroxytoluene.

[0069] The raw material of the heat-vulcanized type silicone rubber comprises: 100 parts of silicone rubber, 45 parts of white carbon black, 8 parts of phenyl silicone oil, 5 parts of diphenyl dimethoxysilane, and 1.5 parts of 2,4-dichloro benzoyl peroxide.

[0070] The added amount of the bird repellent essential oil microcapsule is 2% of the mass of the raw rubber silicone rubber.

[0071] The mass ratio of the wall material ethyl cellulose to the core material bird repellent essential oil in the bird repellent essential oil microcapsule is 8:1.

[0072] The particle size of the bird repellent essential oil microcapsule is 25 μm, and the thickness of the wall material is 4 μm.

[0073] 5 mg of the heat-vulcanized type silicone rubber containing the bird repellent essential oil microcapsule obtained in the example is weighed, placed in a dialysis bag, and added to 50 mL of phosphate buffer (pH = 7.4), and oscillated at a constant speed of 150 r / min at 37°C. 3 mL of sample is taken for detection every day, and the phosphate buffer is added in time after sampling. The cumulative release amount (%) at each time point is calculated by high performance liquid chromatography detection. The cumulative release amount F(t) and time t (days) are fitted by selecting the Higuchi kinetic model by using the Origin software, and the following equation is obtained:

[0074] Higuchi equation F(t) = 1.269t 1 / 2 -9.3815, r = 0.9965.

[0075] When the cumulative release amount F(t) = 50, the required time is 6 years calculated by the equation.

[0076] The bird repellent experiment of example 1 is carried out as follows

[0077] I. Experimental purpose: the bird repellent silicone rubber composite insulator obtained in example 1 is subjected to bird repellent experiment.

[0078] II. Experimental method: combined with the actual environment of the power transmission line, two areas are divided, and the interval between the areas is 10 meters. The bird repellent silicone rubber composite insulator described in example 1 is used in one area as an experimental group, and the ordinary silicone rubber composite insulator is used in the other area as a control group.

[0079] Before the experiment monitoring, the same number and same species 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. The bird activities are observed and recorded.

[0080] III. Experimental results:

[0081] Table 1 selected part of the experimental group results

[0082]

[0083] Table 2 results of the control group

[0084] Example 2

[0085] The difference from Example 1 is that the raw materials for preparing the core material of the bird repellent essential oil microcapsule include, by weight fraction: 75 parts of phenyl o-hydroxybenzoate, 25 parts of grapefruit peel ethanol extract, 5 parts of cinnamon bark ethanol extract, 5 parts of civetone, 8 parts of quercitrin, and 2.5 parts of dibutyl hydroxytoluene.

[0086] The added amount of the bird repellent essential oil microcapsule is 3% of the mass of raw rubber silicone rubber.

[0087] The rest is the same as Example 1.

[0088] Bird repellent experiments are performed on Example 2 below

[0089] I. Experimental purpose: bird repellent experiments are performed on the bird repellent silicone rubber composite insulator obtained in Example 2.

[0090] II. Experimental method: in combination with the actual environment of the power transmission line, two areas are divided, with a distance of 10 meters between the areas. In one area, the bird repellent silicone rubber composite insulator described in Example 2 is used, as the experimental group. In the other area, a common silicone rubber composite insulator is used, as the control group.

[0091] Before the experiment, the same number and species 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. The birds are observed and recorded.

[0092] III. Experimental results:

[0093] Table 3 selected results of the experimental group

[0094]

[0095] Table 4 results of the control group

[0096]

[0097] Example 3

[0098] The difference from Example 1 is that the mass ratio of the wall material ethyl cellulose to the core material bird repellent essential oil in the bird repellent essential oil microcapsule is 10:1.

[0099] The added amount of the bird repellent essential oil microcapsule is 4% of the mass of raw rubber silicone rubber.

[0100] The particle size of the bird repellent essential oil microcapsule is 30 μm, and the thickness of the wall material is 5.5 μm.

[0101] Other than Example 1.

[0102] The Higuchi equation F(t)=1.073t was obtained by the method described in Example 1. 1 / 2 -6.1394, r=0.9986.

[0103] When the cumulative release amount F(t)=50, the time required was 7.5 years calculated by the equation. Example 4

[0104] The raw materials for preparing the core material of the bird repellent essential oil microcapsule include, by weight fraction: 65 parts of phenyl salicylate, 25 parts of grapefruit peel ethanol extract, 8 parts of cinnamon bark ethanol extract, 4 parts of eugenol, 10 parts of quercitrin, and 2 parts of dibutyl hydroxytoluene.

[0105] The raw materials of the heat vulcanized type silicone rubber include, by weight fraction: 100 parts of silicone rubber, 50 parts of white carbon black, 7 parts of phenyl silicone oil, 3 parts of diphenyl dimethoxysilane, and 1.2 parts of 2,4-dichlorobenzoyl peroxide.

[0106] The added amount of the bird repellent essential oil microcapsule is 1.5% of the mass of the raw rubber silicone rubber.

[0107] The mass ratio of the wall material ethyl cellulose to the core material bird repellent essential oil in the bird repellent essential oil microcapsule is 8:1.

[0108] The particle size of the bird repellent essential oil microcapsule is 20 μm, and the thickness of the wall material is 3.5 μm.

[0109] The Higuchi equation F(t)=1.366t was obtained by the method described in Example 1. 1 / 2 -8.3374, r=0.9937.

[0110] When the cumulative release amount F(t)=50, the time required was 5 years calculated by the equation.

[0111] The bird repellent experiment of Example 4 is described below

[0112] I. Experimental purpose: the bird repellent silicone rubber composite insulator obtained in Example 4 was subjected to a bird repellent experiment.

[0113] II. Experimental method: in combination with the actual environment of the power transmission line, two areas were divided, with a distance of 10 meters between the areas, the bird repellent silicone rubber composite insulator described in Example 4 was used in one area as the experimental group, and the ordinary silicone rubber composite insulator was used in the other area as the control group.

[0114] Before the experiment, the same number of the same species of birds were released in each area: 5 crows, 5 magpies, 5 pigeons and 5 woodpeckers. The birds were not fed a day in advance. The activities of the birds were observed and recorded.

[0115] III. Experimental results:

[0116] Table 5 Selected experimental group results

[0117]

[0118] Table 6 Control group results

[0119]

[0120] Comparative Example 1

[0121] The difference between Example 1 and the present comparative example is that the raw materials for preparing the core material of the bird repellent essential oil microcapsules of the present comparative example include, by weight: 40 parts of phenyl o-hydroxybenzoate, 45 parts of grapefruit peel ethanol extract, 15 parts of cinnamon bark ethanol extract, 3 parts of civetone, 15 parts of quercitrin and 1.5 parts of dibutyl hydroxytoluene.

[0122] The bird repelling experiment of Comparative Example 1 is carried out as follows

[0123] I. Experimental purpose: bird repelling experiment of the bird repellent silicone rubber composite insulator obtained in Comparative Example 1.

[0124] II. Experimental method: in combination with the actual environment of the power transmission line, two areas are divided, with a distance of 10 meters between the areas. The bird repellent silicone rubber composite insulator of Comparative Example 1 is used in one area as the experimental group, and the ordinary silicone rubber composite insulator is used in the other area as the control group.

[0125] Before the experiment, the same number of the same species of birds were released in each area: 5 crows, 5 magpies, 5 pigeons and 5 woodpeckers. The birds were not fed a day in advance. The activities of the birds were observed and recorded.

[0126] III. Experimental results:

[0127] Table 7 Selected experimental group results

[0128]

[0129] Table 8 Control group results

[0130]

[0131] Comparative Example 2

[0132] The raw materials for preparing the core material of the bird repellent essential oil microcapsules of the present comparative example include, by weight parts, 50 parts of phenyl o-hydroxybenzoate, 25 parts of grapefruit peel ethanol extract, 3 parts of cinnamon bark ethanol extract, 15 parts of geosmin, 25 parts of quercitrin, and 1.5 parts of dibutylhydroxytoluene.

[0133] Bird repellency experiment was conducted on Comparative Example 2

[0134] I. Experimental purpose: bird repellency experiment was conducted on the bird repellent silicone rubber composite insulator obtained in Comparative Example 2.

[0135] II. Experimental method: in combination with the actual environment of the power transmission line, two areas were divided with a distance of 10 meters between the areas. The bird repellent silicone rubber composite insulator described in Comparative Example 2 was used in one area as the experimental group, and the ordinary silicone rubber composite insulator was used in the other area as the control group.

[0136] Before the experiment, the same number and 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. The bird activities were observed and recorded.

[0137] III. Experimental results:

[0138] Table 9: Selected experimental group results

[0139]

[0140] Table 10: Control group results

[0141]

[0142] Comparative Example 3

[0143] The difference between the present comparative example and Example 1 is that the particle size of the bird repellent essential oil microcapsules of the present comparative example is 50 μm.

[0144] Comparative Example 4

[0145] The difference between the present comparative example and Example 1 is that the addition amount of the bird repellent essential oil microcapsules of the present comparative example is 8% of the mass of the raw rubber silicone rubber.

[0146] Comparative Example 5

[0147] The difference between the present comparative example and Example 1 is that the present comparative example is a heat vulcanized type silicone rubber without bird repellent essential oil microcapsules.

[0148] Mechanical property tests were conducted on the heat vulcanized type silicone rubbers containing bird repellent essential oil microcapsules obtained in Examples 1-4 and Comparative Examples 1-5, and the test results are shown in Table 11.

[0149] Table 11

[0150]

Claims

1. A bird- resistant silicone rubber composite insulator, characterized by, The bird repellent oil microcapsule is uniformly distributed in the hot vulcanized type silicone rubber of the outer insulating material; The raw materials for preparing the core material of the bird repellent oil microcapsule include, by weight fraction, 60-75 parts of phenyl benzoate, 25-30 parts of grapefruit peel ethanol extract, 5-10 parts of cinnamon bark ethanol extract, 3-5 parts of carnosiflorum ketone, 8-15 parts of quercitrin, and 1.5-2.5 parts of dibutyl hydroxytoluene; the bird repellent oil microcapsule is added in an amount of 1.5%-4% of the mass of raw rubber silicone; the particle size of the bird repellent oil microcapsule is 20-30 μm, wherein the wall material thickness is 3.5-5.5 μm; the bird repellent oil microcapsule is prepared by the following steps: (1) preparing the core material: the raw materials of phenyl benzoate, grapefruit peel ethanol extract, cinnamon bark ethanol extract, carnosiflorum ketone, quercitrin, and dibutyl hydroxytoluene are sequentially added into a 95wt% ethanol solution to be dissolved, to obtain a bird repellent oil with a concentration of 80-90wt%; (2) preparing the oil microcapsule: Ethyl cellulose is weighed and dissolved in ethyl acetate to form a uniform ethyl cellulose ethyl acetate solution; Under magnetic stirring, the bird repellent oil and Span80 are weighed in a weight ratio of 1-1.5:1 and added to the obtained ethyl cellulose ethyl acetate solution to form a primary emulsion; The primary emulsion is dispersed into an aqueous phase composed of 3.5-4wt% gelatin and 2.5-3wt% sodium dodecyl sulfate, and stirred to form a mixed solution; The stirring is continued at 80-85℃ for 6-7h, and the microcapsule is solidified; The microcapsule is separated by reduced pressure suction filtration and dried.

2. The bird- resistant silicone rubber composite insulator according to claim 1, characterized in that, The mass ratio of ethyl cellulose to bird repellent oil in the bird repellent oil microcapsule is 8-10:

1.

3. The bird- resistant silicone rubber composite insulator according to claim 1, characterized in that, The raw materials of the hot vulcanized type silicone rubber include, by weight fraction, 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.

4. A process for the production of a bird- resistant silicone rubber composite insulator as claimed in any one of claims 1 to 3, characterised in that, The method comprises the following steps: The silicone rubber, white carbon black, phenyl silicone oil, and diphenyl dimethoxysilane are mixed to prepare a mixed rubber; The 2,4-dichlorobenzoyl peroxide and the bird repellent oil microcapsule are added to the mixed rubber, and the mixed rubber is opened to obtain silicone rubber containing the bird repellent oil microcapsule; The silicone rubber containing the bird repellent oil microcapsule is vulcanized with a core rod to form an insulator semi-product; The inner end of the insulator semi-product is smeared with sealant, and then a metal fitting is inserted into the insulator semi-product, and the press joint device is used for press joint, to obtain the bird repellent silicone rubber composite insulator.

5. The bird repellent silicone rubber composite insulator according to any one of claims 1-3 is applied to a 10-500KV power transmission line.

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