CN112759936A - Silicone rubber umbrella skirt for extra-high voltage composite insulator and preparation method thereof - Google Patents
Silicone rubber umbrella skirt for extra-high voltage composite insulator and preparation method thereof Download PDFInfo
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- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
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Abstract
The invention discloses a silicone rubber umbrella skirt for an extra-high voltage composite insulator and a preparation method thereof, and relates to the technical field of silicone rubber materials. The invention discloses a silicone rubber umbrella skirt for an extra-high voltage composite insulator, which is composed of the following raw materials in parts by weight: 100 parts of methyl vinyl phenyl silicone rubber crude rubber, 40-80 parts of Mg-SiC compound, 50-70 parts of modified diatomite, 1.5-4 parts of silane coupling agent, 3-5 parts of hydroxyl silicone oil, 4-7 parts of cyclic trisilazane, 5-8 parts of nano ZnO, 2-5 parts of titanium dioxide, 1.5-3 parts of dispersing agent and 1-3 parts of vulcanizing agent. The silicon rubber shed provided by the invention has excellent electrical insulation, flame retardance, hydrophobic property, high and low temperature resistance and mechanical strength, improves the pollution flashover resistance and aging resistance of the silicon rubber shed, is not easy to damage, and prolongs the service life of the composite insulator.
Description
Technical Field
The invention belongs to the technical field of silicone rubber materials, and particularly relates to a silicone rubber umbrella skirt for an extra-high voltage composite insulator and a preparation method thereof.
Background
Compared with traditional ceramic insulator and glass insulator, the composite insulator has strong hydrophobicity and hydrophobicity mobility, light weight, convenient transportation and installation, high strength, good mechanical property and strong convenience in operation and maintenance, thus being widely applied to the electric field of China. The umbrella sleeve and the core rod of the composite insulator are made of organic materials, the intermolecular bonding force of the material is weaker than that of inorganic materials such as porcelain, glass and the like, and the material can age under the action of factors such as corona discharge, ultraviolet radiation, moisture, temperature change, dirt and the like. After a period of aging, the insulating property, the mechanical property, the hydrophobic property and the anti-pollution flashover property of the composite insulator are gradually reduced, and accidents such as flashover, breakage, abnormal heating and the like begin to occur, thus seriously threatening the safe and stable operation of a power grid.
At present, the widely applied silicone rubber umbrella skirt is generally made of three main components of methyl vinyl silicone rubber crude rubber, aluminum hydroxide and fumed silica, and is matched with a structure control agent, a coloring agent and the like to prepare a special net-shaped organic material through high-temperature vulcanization crosslinking, so that the composite insulator is endowed with excellent electrical insulation, mechanical properties and weather resistance. Under the action of ultraviolet radiation for a long time, silicon-carbon bonds and carbon-hydrogen bonds can be broken to form free radicals, the generated free radicals are combined to generate micromolecule oligomers which are volatilized, macromolecular polymers are mutually crosslinked, the crosslinking density of the silicon rubber is increased, materials are hardened, and the tensile strength is reduced; under a high-humidity or rainwater environment for a long time, an acidic aqueous solution environment is formed on the surface of the insulator, hydrogen ions attack silicon-oxygen bonds of a main chain of the silicon rubber to break bonds, the groups after the bonds are broken cannot be recombined, small molecules at the tail ends of the hydroxyl groups are generated under an acidic condition, and in addition, inorganic filler aluminum hydroxide in the silicon rubber can react with acidic substances to promote the hydrolysis of the silicon rubber; meanwhile, the silicon rubber molecules contain terminal hydroxyl groups, and under the condition that high voltage and large current pass through, the terminal hydroxyl groups initiate a main chain tripping type degradation reaction of the silicon rubber molecules, so that micromolecular polysiloxane can be decomposed, the hydrophobicity of the surface of the insulator is lost, the surface of the insulator is subjected to electric corrosion loss and creepage tracking, and the silicon rubber umbrella skirt is poor in ageing resistance and short in service life.
Chinese invention patent CN201510125814.2 discloses a high voltage electric erosion resistant silicone rubber composition for a composite insulator and a preparation method thereof, which improves the electric erosion resistance grade of the silicone rubber composition for the composite insulator and keeps good mechanical property by adding heat-conducting metal oxide nano particles, but the insulator has common aging resistance and short service life due to poor hydrophobic property and common pollution flashover resistance. The invention Chinese patent CN201510066190.1 discloses a fluorosilicone rubber for an aging-resistant porcelain composite insulator and an application thereof, wherein the fluorosilicone rubber is prepared from raw fluororubber, silicone rubber compound, aluminum hydroxide powder, fumed silica, a dipenta-sulfur agent, polytetrafluoroethylene powder and other raw materials, and has excellent tear strength and aging resistance, but the composite insulator contains fluorine in the raw materials and has a large influence on the environment, and the insulator has general electrical properties such as high-voltage resistance, corrosion resistance, puncture resistance and the like, and the raw materials contain the aluminum hydroxide, so that after the composite insulator is used for a period of time, the hydrophobicity and the pollution and flash resistance of the composite insulator are poor, and the requirements of the increasingly developed power industry cannot be met.
Disclosure of Invention
The invention aims to provide a silicone rubber shed for an extra-high voltage composite insulator, which has excellent electrical insulation, flame retardance, hydrophobic property, high and low temperature resistance and mechanical strength, improves the pollution flashover resistance and aging resistance of the silicone rubber shed, is not easy to damage and prolongs the service life of the composite insulator.
In order to realize the purpose of the invention, the invention provides a silicon rubber umbrella skirt for an extra-high voltage composite insulator, which is composed of the following raw materials in parts by weight: 100 parts of methyl vinyl phenyl silicone rubber crude rubber, 40-80 parts of Mg-SiC compound, 50-70 parts of modified diatomite, 1.5-4 parts of silane coupling agent, 3-5 parts of hydroxyl silicone oil, 4-7 parts of cyclic trisilazane, 5-8 parts of nano ZnO, 2-5 parts of titanium dioxide, 1.5-3 parts of dispersing agent and 1-3 parts of vulcanizing agent.
Further, the raw methyl vinyl phenyl silicone rubber is composed of low phenyl silicone rubber and high phenyl silicone rubber, and the mass ratio of the low phenyl silicone rubber to the high phenyl silicone rubber is (2.8-3.5): 1.
further, the low-phenyl silicone rubber has a phenyl content of 6-10% and a vinyl content of 0.18-0.26%.
Furthermore, the phenyl content of the high phenyl silicone rubber is 36-45%, and the vinyl content is 0.09-0.18%.
Further, the Mg-SiC compound is formed by Mg (OH)2And SiC.
Further, the preparation method of the Mg-SiC compound specifically comprises the following steps: soaking silicon carbide powder in 2mol/L NaOH solution at 60-80 deg.C for 3-5h, filtering, adding distearoyl isopropyl aluminate (SG-AI821) at the temperature, stirring for 0.5-1h, and drying to obtain surface modified silicon carbide; mixing magnesium hydroxide and surface modified silicon carbide, and reacting at the temperature of 90-110 ℃ for 4-7h to prepare an Mg-SiC compound; the mass of the distearoyl oxygen isopropyl aluminate is 12.5 to 18.6 percent of the silicon nitride powder; the mass ratio of the magnesium hydroxide to the surface-modified silicon carbide is (4.8-8): 1.
Further, the particle size of the modified diatomite is 0.5-80 μm, and the preparation method of the modified diatomite comprises the following steps: uniformly mixing diatomite and absolute ethyl alcohol, adjusting the pH value to 6-7, stirring for 1-2h at 50-70 ℃, cooling, filtering, washing with deionized water for at least 3 times, then putting into a ball mill, adding vinyl trimethoxy silane into the ball mill, wet-grinding, drying, and then putting into the ball mill for ball milling to prepare modified diatomite with the required particle size; the mass ratio of the diatomite to the vinyltrimethoxysilane is 1: (0.05-0.08); the mass ratio of the diatomite to the absolute ethyl alcohol is 1: (2-4).
Further, the dispersing agent is a compound of HPMA and zinc stearate, and the mass ratio of the HPMA to the zinc stearate is 3: 1.
Further, the vulcanizing agent is phenol formaldehyde resin.
A preparation method of the silicon rubber umbrella skirt for the extra-high voltage composite insulator comprises the following steps:
(1) placing methyl vinyl phenyl silicone rubber crude rubber, an Mg-SiC compound and hydroxyl silicone oil in a kneader, mixing for 0.5-1h at 80-120 ℃, then putting the modified diatomite, the annular trisilazane, the nano ZnO, the titanium dioxide, the dispersing agent and the silane coupling agent into the kneader, vacuumizing and kneading for 2-3h, wherein the vacuum degree is 0.05-0.26MPa, the temperature is 120-160 ℃, and the rubber compound is obtained;
(2) wrapping the rubber compound on a roll of an open mill, adding a vulcanizing agent, thinly passing, discharging, then placing the sheet material on a flat vulcanizing machine for vulcanization molding, and vulcanizing at the temperature of 160-180 ℃ and under the pressure of 10-12MPa for 10-12min to obtain a silicon rubber material;
(3) and (3) placing the silicon rubber material and the core rod coated with the binder into a vulcanizing machine mold, and molding at high temperature for 15-20min at the temperature of 180 ℃ and 200 ℃ and under the pressure of 15MPa to obtain the silicon rubber umbrella skirt for the extra-high voltage composite insulator.
The invention achieves the following beneficial effects:
1. according to the invention, raw methyl phenyl vinyl silicone rubber is used as a substrate and is compounded by low phenyl silicone rubber and high phenyl silicone rubber, and a phenyl side group structure in the methyl phenyl vinyl silicone rubber structure inhibits Si-O rearrangement and hinders ring-forming degradation reaction, so that the thermal degradation speed of the silicone rubber umbrella skirt is reduced, and the thermal stability of the silicone rubber umbrella skirt is improved; the existence of the phenyl inhibits the oxidation of the side group, and meanwhile, the phenyl forms steric hindrance on a silicon-oxygen chain, so that the main chain is difficult to degrade, thereby further improving the thermal stability and the aging resistance of the invention; the low-phenyl silicone rubber and the high-phenyl silicone rubber are optimally proportioned, so that the prepared silicone rubber umbrella skirt has excellent molding processability, can be normally used at the temperature of-100-150 ℃, still has good flexibility at the temperature of-100 ℃, and also has excellent mechanical property, radiation resistance, high voltage resistance, corrosion resistance and electric breakdown resistance.
2. The Mg-SiC composite of the invention is prepared from Mg (OH)2Is compounded with SiC to form the composite material,it is characterized by that it uses distearoyl isopropyl aluminate to make surface activity modification of SiC, then makes it react with Mg (OH)2Prepared by reaction, the Mg-SiC compound has Mg (OH)2And the characteristics of both SiC. The addition of the magnesium hydroxide can improve the tracking resistance and the electrical erosion resistance of the silicon rubber shed, the magnesium hydroxide has excellent thermal stability and flame retardant property, and the flame retardant property of the silicon rubber shed is greatly improved, but the magnesium hydroxide has poor compatibility with polymers and is not easy to disperse uniformly, and the mechanical strength and the surface hydrophobicity of the silicon rubber shed are influenced, so that the compatibility with the magnesium hydroxide is improved by carrying out surface modification on SiC, and the compatibility of the magnesium hydroxide with the SiC and other components is improved, so that the magnesium hydroxide is uniformly dispersed in the matrix of the silicon rubber shed, the mechanical strength of the silicon rubber shed is improved, and the excellent hydrophobicity is ensured; compared with aluminum hydroxide, magnesium hydroxide has higher thermal decomposition temperature, has more excellent processing characteristics, and is not easy to release bound water under high-temperature arc ablation, thereby prolonging the service life of the invention. SiC has higher thermal conductivity and excellent insulating property due to stronger covalent bond and crystal structure, and is mixed with Mg (OH)2After being compounded, the composite material is added into the invention, and Mg (OH) is reduced2The silicon rubber umbrella skirt releases the bound water under the action of thermal decomposition, so that the silicon rubber umbrella skirt has excellent heat conducting performance, and the electrical insulation, the mechanical strength, the hydrophobic performance, the flame retardance and the aging resistance of the silicon rubber umbrella skirt are improved.
3. The modified diatomite is added and modified by the vinyltrimethoxysilane, so that the compatibility of the modified diatomite and other components of the invention is increased, and the mechanical strength of the invention is improved, and the modified diatomite with the particle size of 0.5-80 mu m is used, so that the invention has higher reinforcing effect; compared with the currently used fumed silica, the modified diatomite has lower cost and better molding processability, and the reinforcing effect of the modified diatomite is not inferior to that of the fumed silica.
4. By adding nano ZnO, the heat-conducting property of the silicone rubber umbrella skirt is further improved, and the heat-resisting aging resistance and oil resistance of the silicone rubber umbrella skirt are improved; the titanium dioxide is added, so that the ultraviolet resistance and the light stability of the paint are improved; after the nano ZnO and the titanium dioxide are added, under the action of a dispersing agent and a silane coupling agent, the dispersibility and the binding force of the nano ZnO and the titanium dioxide in raw materials are improved, the nano ZnO and the titanium dioxide are prevented from being separated out in the use process of the composite insulator, the phenomena of whitening and pulverization on the surface of the silicon rubber shed are eliminated, the ageing resistance of the silicon rubber shed is improved, and the mechanical strength and the flame retardance of the silicon rubber shed are further improved.
5. The invention adopts methyl phenyl vinyl silicone rubber crude rubber as a matrix, and is modified by adding additives such as Mg-SiC compound, modified diatomite, nano ZnO, titanium dioxide, silane coupling agent and the like, so as to prepare the silicone rubber umbrella skirt for the ultra-high voltage resistant composite insulator. The silicon rubber umbrella skirt has excellent electrical insulation, flame retardance, hydrophobic property, high and low temperature resistance and mechanical strength, has excellent pollution flashover resistance and aging resistance in natural environment, is not easy to damage, and prolongs the service life of the composite insulator.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The silicone rubber shed for the extra-high voltage composite insulator of the invention is described below with reference to specific embodiments.
Example 1
The preparation method of the silicon rubber umbrella skirt for the extra-high voltage composite insulator specifically comprises the following steps:
(1) 100 parts of methyl vinyl phenyl silicone rubber crude rubber, 40 parts of Mg-SiC compound and 3 parts of hydroxyl silicone oil are placed in a kneader and mixed for 1 hour at the temperature of 80 ℃, then 70 parts of modified diatomite, 7 parts of cyclic trisilazane, 5 parts of nano ZnO, 2 parts of titanium dioxide, 1.5 parts of dispersing agent and 1.5 parts of silane coupling agent are put into the kneader and vacuumized for vacuum kneading, the vacuum degree is 0.05MPa, the temperature is 160 ℃, and the mixing is carried out for 3 hours, thus obtaining the rubber compound.
(2) And (3) coating the rubber compound on a roll mill, adding 3 parts of vulcanizing agent phenol-formaldehyde resin, thinly passing, discharging, then placing the sheet material on a flat plate vulcanizing machine for vulcanization molding, and vulcanizing at 160 ℃ and under the pressure of 12MPa for 10min to obtain the silicon rubber material A1.
(3) And (3) placing the silicon rubber material A1 and the core rod coated with the adhesive into a vulcanizing machine mold, and molding at high temperature for 15-20min at the temperature of 180-200 ℃ and under the pressure of 15MPa to obtain the required silicon rubber umbrella skirt for the extra-high voltage composite insulator.
The raw methyl vinyl phenyl silicone rubber consists of low phenyl silicone rubber and high phenyl silicone rubber, wherein the mass ratio of the low phenyl silicone rubber to the high phenyl silicone rubber is 2.8: 1. wherein, the phenyl content of the low-phenyl silicone rubber is 6 percent, and the vinyl content is 0.26 percent; the phenyl content of the high phenyl silicone rubber was 45% and the vinyl content was 0.09%. The phenyl group content in the present invention means a molar ratio of phenyl groups to silicon atoms, and the vinyl group content means a molar ratio of vinyl groups to silicon atoms.
The Mg-SiC compound is prepared from Mg (OH)2And SiC, and the preparation method specifically comprises the following steps: soaking 10 parts of silicon carbide powder in 2mol/L NaOH solution at 60-80 ℃ for 3-5h, filtering, adding 1.25 parts of distearoyl isopropyl aluminate (SG-AI821) at the temperature, stirring for 0.5-1h, and drying to obtain surface-modified silicon carbide; mixing 48 parts of magnesium hydroxide and 10 parts of surface modified silicon carbide, and reacting at the temperature of 90-110 ℃ for 4-7h to obtain the Mg-SiC compound.
The particle size of the modified diatomite is 0.5-80 μm, and the preparation method of the modified diatomite comprises the following steps: uniformly mixing 10 parts of diatomite and 40 parts of absolute ethyl alcohol, adjusting the pH value to 6-7, stirring for 1-2h at 50-70 ℃, cooling, filtering, washing with deionized water for at least 3 times, then placing into a ball mill, adding 0.5 part of vinyltrimethoxysilane into the ball mill, wet-milling, drying, and then placing into the ball mill for ball milling to obtain the modified diatomite with the required particle size.
The dispersing agent is a compound of HPMA (hydrolyzed polymaleic anhydride) and zinc stearate, and the mass ratio of the HPMA to the zinc stearate is 3: 1.
Example 2
The preparation method of the silicon rubber umbrella skirt for the extra-high voltage composite insulator specifically comprises the following steps:
(1) 100 parts of methyl vinyl phenyl silicone rubber crude rubber, 80 parts of Mg-SiC compound and 5 parts of hydroxyl silicone oil are placed in a kneader and mixed for 0.5h at 120 ℃, then 50 parts of modified diatomite, 4 parts of cyclic trisilazane, 8 parts of nano ZnO, 5 parts of titanium dioxide, 3 parts of dispersant and 4 parts of silane coupling agent are put into the kneader and vacuumized for vacuum kneading, the vacuum degree is 0.26MPa, the temperature is 120 ℃, and the mixing is carried out for 2h, thus obtaining the rubber compound.
(2) And (3) coating the rubber compound on a roll of an open mill, adding 1 part of vulcanizing agent phenol-formaldehyde resin, thinly passing, discharging sheets, then placing the sheets on a flat vulcanizing machine for vulcanization molding, and vulcanizing at 180 ℃ and under the pressure of 10MPa for 12min to obtain the silicon rubber material A2.
(3) And (3) placing the silicon rubber material A2 and the core rod coated with the adhesive into a vulcanizing machine mold, and molding at high temperature for 15-20min at the temperature of 180-200 ℃ and under the pressure of 15MPa to obtain the required silicon rubber umbrella skirt for the extra-high voltage composite insulator.
The raw rubber of the methyl vinyl phenyl silicone rubber is prepared from the following raw materials in a mass ratio of 3.5: 1 of low phenyl silicone rubber and high phenyl silicone rubber. Wherein, the phenyl content of the low-phenyl silicone rubber is 10 percent, and the vinyl content is 0.18 percent; the phenyl content of the high phenyl silicone rubber is 36%, and the vinyl content is 0.18%.
The composition and preparation method of the Mg — SiC composite described above were the same as in example 1, except that in this example, the mass of SG-AI821 was 18.6% of the silicon carbide powder, and the mass ratio of magnesium hydroxide to surface-modified silicon carbide was 8: :1.
The particle size range, components and preparation method of the modified diatomite are the same as those in example 1, except that the mass ratio of the diatomite to the vinyltrimethoxysilane is 1: 0.08; the mass ratio of the diatomite to the absolute ethyl alcohol is 1: 2.
the components of the dispersant described above are the same as in example 1, with specific reference to example 1.
Example 3
The preparation method of the silicon rubber umbrella skirt for the extra-high voltage composite insulator specifically comprises the following steps:
(1) 100 parts of methyl vinyl phenyl silicone rubber crude rubber, 65 parts of Mg-SiC compound and 4.3 parts of hydroxyl silicone oil are placed in a kneader and mixed for 1 hour at 100 ℃, then 58 parts of modified diatomite, 5.7 parts of cyclic trisilazane, 6 parts of nano ZnO, 3.8 parts of titanium dioxide, 2.2 parts of dispersant and 2.9 parts of silane coupling agent are put into the kneader and vacuumized for vacuum kneading, the vacuum degree is 0.18MPa, the temperature is 140 ℃, and the mixed rubber is mixed for 3 hours to obtain the mixed rubber.
(2) And (3) wrapping the mixed rubber on a roller of an open mill, adding 2 parts of phenol-formaldehyde resin, thinly passing, discharging sheets, then placing the sheets on a flat vulcanizing machine for vulcanization molding, and vulcanizing at 170 ℃ and under the pressure of 12MPa for 11min to obtain the silicon rubber material A3.
(3) And (3) placing the silicon rubber material A3 and the core rod coated with the adhesive into a vulcanizing machine mold, and molding at high temperature for 15-20min at the temperature of 180-200 ℃ and under the pressure of 15MPa to obtain the required silicon rubber umbrella skirt for the extra-high voltage composite insulator.
The raw rubber of the methyl vinyl phenyl silicone rubber is prepared from the following raw materials in a mass ratio of 3.1: 1 of low phenyl silicone rubber and high phenyl silicone rubber. Wherein, the phenyl content of the low-phenyl silicone rubber is 8.4 percent, and the vinyl content is 0.22 percent; the phenyl content of the high phenyl silicone rubber was 41% and the vinyl content was 0.12%.
The composition and preparation method of the Mg — SiC composite described above were the same as in example 1, except that in this example, the mass of SG-AI821 was 15.3% of the silicon carbide powder, and the mass ratio of magnesium hydroxide to surface-modified silicon carbide was 6.5: :1.
The particle size range, components and preparation method of the modified diatomite are the same as those in example 1, except that the mass ratio of the diatomite to the vinyltrimethoxysilane is 1: 0.06; the mass ratio of the diatomite to the absolute ethyl alcohol is 1: 3.2.
the components of the dispersant described above are the same as in example 1, with specific reference to example 1.
Comparative example 1
A silicone rubber material B1, whose composition, starting material and preparation were the same as in example 3, except that no Mg-SiC composite was added in this comparative example.
Comparative example 2
A silicone rubber material B2 was prepared in the same manner as in example 3 except that modified diatomaceous earth was not added in this comparative example.
Comparative example 3
A silicone rubber material B3 whose composition, starting material, and preparation method were the same as in example 3, except that the Mg-SiC composite in this comparative example was replaced with aluminum hydroxide.
The silicone rubber materials A1-A3 and B1-B3 prepared in examples 1-3 and comparative examples 1-3 above were tested for their properties according to the following test items and standards:
breakdown strength: the test is carried out according to 5.1 in GB/T1410-2006;
dielectric loss: testing according to GB/T1409-2006;
arc resistance time: testing according to GB/T1411-2002;
tensile strength and elongation at break: testing according to GB/T528-2009;
tear strength: testing according to GB/T529 and 2008;
tracking resistance: testing according to GB/T6553-2014;
shore hardness: testing according to GB/T531.1-2008;
surface resistivity: testing according to GB/T1692-;
flame retardance: testing according to GB/T10707-2008;
static contact angle: testing according to DLT 376-;
and (3) photo-aging treatment: carrying out artificial photoaging by adopting GB/T16422.3-1997, putting a treated sample into an ultraviolet ray weathering resistance test box, using UV-A340 fluorescent ultraviolet ray as a light source, keeping the distance between the sample and the light source at 50mm, circularly irradiating and exposing for 8h at the black standard temperature of 60 +/-3 ℃, then carrying out non-irradiation condensation and exposure for 4h at the black standard temperature of 50 +/-3 ℃ until the exposure time reaches 5000h, wherein the irradiation intensity is 2000-2600 mu W/cm2 s, and then measuring the hydrophobic performance of the treated sample by adopting the DLT 376-.
TABLE 1 detection results of properties of Silicone rubber materials
As can be seen from the results in table 1, the silicone rubber sheds for composite insulators made of the silicone rubber materials a1, a2 and A3 have excellent electrical insulation, high voltage resistance, excellent water repellency and aging resistance, and greatly improved mechanical strength and flame retardancy. The addition of the Mg-SiC compound greatly improves the electrical insulation property, the mechanical strength, the hydrophobic property, the flame retardance and the aging resistance of the invention, and improves the tracking resistance and the electrical erosion resistance of the invention.
The technical features of the embodiments described above can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (10)
1. The silicon rubber umbrella skirt for the extra-high voltage composite insulator is characterized by comprising the following raw materials in parts by weight: 100 parts of methyl vinyl phenyl silicone rubber crude rubber, 40-80 parts of Mg-SiC compound, 50-70 parts of modified diatomite, 1.5-4 parts of silane coupling agent, 3-5 parts of hydroxyl silicone oil, 4-7 parts of cyclic trisilazane, 5-8 parts of nano ZnO, 2-5 parts of titanium dioxide, 1.5-3 parts of dispersing agent and 1-3 parts of vulcanizing agent.
2. The silicone rubber shed for the extra-high voltage composite insulator, according to claim 1, is characterized in that the raw methyl vinyl phenyl silicone rubber is composed of low phenyl silicone rubber and high phenyl silicone rubber, and the mass ratio of the low phenyl silicone rubber to the high phenyl silicone rubber is (2.8-3.5): 1.
3. the silicone rubber shed for the extra-high voltage composite insulator as recited in claim 2, wherein the low phenyl silicone rubber has a phenyl content of 6-10% and a vinyl content of 0.18-0.26%.
4. The silicone rubber shed for the extra-high voltage composite insulator according to claim 2, wherein the phenyl content of the high phenyl silicone rubber is 36-45%, and the vinyl content is 0.09-0.18%.
5. The silicone rubber shed for extra-high voltage composite insulators of claim 1, wherein the Mg-SiC compound is made of Mg (OH)2And SiC.
6. The silicone rubber shed for the extra-high voltage composite insulator according to claim 5, wherein the preparation method of the Mg-SiC composite specifically comprises the following steps: soaking silicon carbide powder in 2mol/L NaOH solution at 60-80 deg.C for 3-5h, filtering, adding distearoyl isopropyl aluminate, stirring at the temperature for 0.5-1h, and drying to obtain surface-modified silicon carbide; mixing magnesium hydroxide and surface modified silicon carbide, and reacting at the temperature of 90-110 ℃ for 4-7h to prepare an Mg-SiC compound; the mass of the distearoyl oxygen isopropyl aluminate is 12.5 to 18.6 percent of the silicon nitride powder; the mass ratio of the magnesium hydroxide to the surface-modified silicon carbide is (4.8-8): 1.
7. The silicone rubber shed for the extra-high voltage composite insulator according to claim 1, wherein the particle size of the modified diatomite is 0.5-80 μm, and the preparation method of the modified diatomite comprises the following steps: uniformly mixing diatomite and absolute ethyl alcohol, adjusting the pH value to 6-7, stirring for 1-2h at 50-70 ℃, cooling, filtering, washing with deionized water for at least 3 times, then putting into a ball mill, adding vinyl trimethoxy silane into the ball mill, wet-grinding, drying, and then putting into the ball mill for ball milling to prepare modified diatomite with the required particle size; the mass ratio of the diatomite to the vinyltrimethoxysilane is 1: (0.05-0.08); the mass ratio of the diatomite to the absolute ethyl alcohol is 1: (2-4).
8. The silicone rubber shed for the extra-high voltage composite insulator according to claim 1, characterized in that the dispersant is a compound of HPMA and zinc stearate, and the mass ratio of the HPMA to the zinc stearate is 3: 1.
9. The silicone rubber shed for extra-high voltage composite insulators according to claim 1, wherein the vulcanizing agent is phenol formaldehyde resin.
10. The preparation method of the silicone rubber shed for the extra-high voltage composite insulator, which is defined by claims 1-9, is characterized by comprising the following steps:
(1) placing methyl vinyl phenyl silicone rubber crude rubber, an Mg-SiC compound and hydroxyl silicone oil in a kneader, mixing for 0.5-1h at 80-120 ℃, then putting the modified diatomite, the annular trisilazane, the nano ZnO, the titanium dioxide, the dispersing agent and the silane coupling agent into the kneader, vacuumizing and kneading for 2-3h, wherein the vacuum degree is 0.05-0.26MPa, the temperature is 120-160 ℃, and the rubber compound is obtained;
(2) wrapping the rubber compound on a roll of an open mill, adding a vulcanizing agent, thinly passing, discharging, then placing the sheet material on a flat vulcanizing machine for vulcanization molding, and vulcanizing at the temperature of 160-180 ℃ and under the pressure of 10-12MPa for 10-12min to obtain a silicon rubber material;
(3) and (3) placing the silicon rubber material and the core rod coated with the binder into a vulcanizing machine mold, and molding at high temperature for 15-20min at the temperature of 180 ℃ and 200 ℃ and under the pressure of 15MPa to obtain the silicon rubber umbrella skirt for the extra-high voltage composite insulator.
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