CN112029290A - High-temperature vulcanized silicone rubber insulating material for composite insulator and preparation thereof - Google Patents
High-temperature vulcanized silicone rubber insulating material for composite insulator and preparation thereof Download PDFInfo
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Abstract
The invention discloses a high-temperature vulcanized silicone rubber insulating material for a composite insulator and a preparation method thereof. The invention repeatedly adjusts and tests the formula of the high-temperature vulcanized silicone rubber, determines the formula which can reduce the electric erosion resistance and the tracking resistance of the high-temperature vulcanized silicone rubber insulating material for the existing composite insulator from the level of not less than TMA4.5kV to the level of not less than TMA3.5kV and not less than TMA2.5kV, and correspondingly improves the raw rubber content of the silicone rubber in the material. The small-range trial operation proves that the operation requirement of the power insulator made of the high-temperature vulcanized silicone rubber can be met when the electric corrosion resistance and the tracking resistance of the material reach not less than TMA2.5kV level, and the service life of the power insulator made of the high-temperature vulcanized silicone rubber can be prolonged by greatly increasing the content of the raw silicone rubber in the material.
Description
Technical Field
The invention relates to the field of high polymer materials, in particular to a high-temperature vulcanized silicone rubber insulating material for a composite insulator and a preparation method thereof.
Background
As the line insulator type with the largest domestic power grid application amount, the service life of the current high-temperature vulcanized silicone rubber composite insulator (hereinafter referred to as HTV composite insulator or composite insulator) is about 10-20 years, which is far shorter than the service life of the traditional porcelain and glass insulator (50-100 years), and is also greatly shorter than the predicted service life of the early composite insulator (30-40 years), so that the high-temperature vulcanized silicone rubber composite insulator is a major hidden danger of safe operation of an overhead transmission line and is concerned. However, the composite insulator is considered to be low in price in the early stage, and has economic advantages compared with porcelain and glass insulators even if replaced once in 10 years, and the idea cannot be established with the great improvement of labor and construction cost in recent years, and the disadvantages are increased day by day.
For the reason of preventing large-area pollution flashover, national grid Jibei company becomes the earliest power grid unit for using composite insulators in large quantities in China, the composite insulators are applied to 500kV large house lines and shachang lines in the early 90 th century, rich operation experience is accumulated, and in recent years, the improvement on the composite insulators (wherein one of the improvement directions is to adjust the formula and the performance of high-temperature vulcanized silicone rubber (HTV) used by the composite insulators), the operation life of the composite insulators is prolonged, the worries about the power grid are relieved, and the scheme of improving the formula of the high-temperature vulcanized silicone rubber used by the composite insulators of the national grid Jibei company in 2019 obtains the approval of national grid equipment department and expands the operation on 500kV lines (including 500kV upper supporting lines) on the basis of small-scale trial operation of existing 110kV and 220kV lines.
The high-temperature vulcanized silicone rubber shed sheath of the composite insulator has the advantages that on one hand, the high-temperature vulcanized silicone rubber shed sheath provides excellent external insulation performance, on the other hand, the high-temperature vulcanized silicone rubber shed sheath has the effect of protecting the core rod and the interface from being corroded by the external environment, so that the aging resistance of the high-temperature vulcanized silicone rubber shed sheath is more important than the aging resistance of the core rod and the interface between the core rod and the sheath in a certain sense, and. In fact, in the composite insulator which is operated for more than 10 years in large amount in recent years, the aging characteristic that the umbrella skirt sheath is hardened and the hydrophobic mobility is reduced is presented, and the aging trend is inevitable, because the hydrophobic mobility inevitably consumes the silicon rubber virgin rubber in the high-temperature vulcanized silicon rubber umbrella skirt sheath, and the service life of the virgin rubber is expired after the large consumption-only the service life of the conventional product is unreasonably short, namely the service life is excessively considered and the anti-corrosion and tracking performance of the high-temperature vulcanized silicon rubber are improved, the 'general technical condition for insulating materials for polymer insulator umbrella skirt and sheath (DL/T376-2019)' which is formally implemented in 5.1.2020 requires that the anti-corrosion and tracking performance is TMA4.5kV, and early unit and industry experts still push the anti-corrosion and tracking performance of TMA6.0kV, thereby forcing the composite insulator manufacturer to greatly improve the content of the flame retardant (such as aluminum hydroxide) in the material formula, the content of the raw silicone rubber in the material is correspondingly severely limited. The most direct and effective measure for delaying the aging of the high-temperature vulcanized silicone rubber umbrella skirt sheath for the composite insulator and prolonging the service life of the composite insulator is to improve the content (or proportion) of the raw silicone rubber in the material.
For the suggestion of greatly improving the content of the silicon rubber raw rubber in the high-temperature silicon sulfide rubber material for the composite insulator to prolong the service life of the composite insulator, a large part of professionals in the industry have objections, because the performance of the existing high-temperature silicon sulfide rubber material such as the resistance to electric corrosion, the leakage tracking and the like is reduced, the worry that the discharge arc appearing on the surface of the insulator can quickly ablate and damage the umbrella skirt sheath of the composite insulator during the operation is concerned, but the strong arc frequently appearing on the surface of the traditional porcelain and glass insulator can effectively inhibit the surface leakage current and the discharge arc by neglecting the hydrophobicity of the high-temperature silicon sulfide rubber material, so that the strong arc frequently appearing on the surface of the traditional porcelain and glass insulator is difficult to frequently appear on the surface of the composite insulator, namely, the high-temperature silicon sulfide rubber material for the composite insulator does not need to. Based on the knowledge, the invention aims to greatly improve the content of the raw silicon rubber in the high-temperature vulcanized silicon rubber material for the composite insulator so as to effectively prolong the service life of the composite insulator, and simultaneously optimize the anti-corrosion performance, the tracking resistance, the flame retardance, the mechanical performance and the like of the high-temperature vulcanized silicon rubber material to the most reasonable range, thereby not only meeting the actual operation requirement of the composite insulator, but also avoiding the negative effect on the service life of the composite insulator caused by excessively raising the performance parameters.
Disclosure of Invention
The invention aims to provide a high-temperature vulcanized silicone rubber insulating material for a composite insulator and a preparation method thereof. The invention breaks through the limitation of the existing standard, realizes the optimization of various performances of the high-temperature vulcanized silicone rubber, and greatly prolongs the service life of the composite insulator.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a high-temperature vulcanized silicone rubber insulating material for a composite insulator, which comprises the following raw materials in parts by weight in a formula I or a formula II:
the formula I is as follows: 100 parts of methyl vinyl silicone rubber, 80-100 parts of aluminum hydroxide, 30-40 parts of fumed silica, 7.5-12.5 parts of a coloring agent, 2.5-4.0 parts of hydroxyl silicone oil, 4.0-7.0 parts of methyl silicone oil and 1.0-1.5 parts of a dipenta vulcanizing agent;
and a second formula: 100 parts of methyl vinyl silicone rubber, 50-70 parts of aluminum hydroxide, 20-30 parts of fumed silica, 5-10 parts of a coloring agent, 0.6-1.2 parts of hydroxyl silicone oil, 4.0-8.0 parts of methyl silicone oil and 0.5-1.0 part of a dipenta vulcanizing agent.
Based on the high-temperature vulcanized silicone rubber insulating material disclosed by the invention, preferably, the high-temperature vulcanized silicone rubber insulating material prepared by the formula I has the tracking resistance and the electric erosion resistance which are not lower than TMA3.5kV level, and are 1 level lower than TMA4.5kV level required by 'general technical conditions of insulating materials for polymer insulator sheds and sheaths' (latest edition of standards), but the tracking resistance and the electric erosion resistance can well resist surface discharge during normal operation of a composite insulator, so that safe operation is realized; compared with the high-temperature vulcanized silicone rubber material required by DL/T376-2019, the high-temperature vulcanized silicone rubber material of the formula I has the advantages that the weight ratio of the raw silicone rubber in the high-temperature vulcanized silicone rubber material can be higher, and the durability of the hydrophobicity of the high-temperature vulcanized silicone rubber material and the service life of the composite insulator can be prolonged.
Based on the high-temperature vulcanized silicone rubber insulating material disclosed by the invention, preferably, the tracking resistance and the electric erosion resistance of the high-temperature vulcanized silicone rubber insulating material prepared by the formula II are not lower than TMA2.5kV level, 2 levels lower than TMA4.5kV level required by 'general technical conditions of insulating materials for polymer insulator sheds and sheaths' DL/T376-2019 (latest edition standard), and 1 level lower than TMA3.5kV level tracking resistance and electric erosion resistance of the high-temperature vulcanized silicone rubber insulating material prepared by the formula I, but the tracking resistance and the electric erosion resistance can still well resist surface discharge during normal operation of a composite insulator, so that safe operation is realized; compared with the high-temperature vulcanized silicone rubber material required by DL/T376-2019, the weight ratio of the raw silicone rubber in the high-temperature vulcanized silicone rubber material of the second formula can be higher than that of the raw silicone rubber of the high-temperature vulcanized silicone rubber material prepared by the first formula, and the durability of the hydrophobicity of the high-temperature vulcanized silicone rubber material and the service life of the composite insulator can be further prolonged. Wherein the weight ratio of the silicone rubber raw rubber of the high-temperature vulcanized silicone rubber material required by DL/T376-2019 is about 30-35%, the weight ratio of the silicone rubber raw rubber of the high-temperature vulcanized silicone rubber material required by the formula I is about 40%, and the weight ratio of the silicone rubber raw rubber of the high-temperature vulcanized silicone rubber material required by the formula II is about 50%.
Based on the high temperature vulcanized silicone rubber insulation material of the present invention, it is preferred that the colorant include, but not limited to, iron sesquioxide, wherein iron sesquioxide as the colorant can give the high temperature vulcanized silicone rubber insulation material a red appearance.
Based on the high-temperature vulcanized silicone rubber insulating material, preferably, the first formula comprises:
100 parts of methyl vinyl silicone rubber, 90 parts of aluminum hydroxide, 35 parts of fumed silica, 10 parts of a coloring agent, 3.5 parts of hydroxyl silicone oil, 5.5 parts of methyl silicone oil and 1.0 part of a bis-dipenta vulcanizing agent.
More preferably, the colorant in the formula I is ferric oxide, and the high-temperature vulcanized silicone rubber insulating material is red; and the prepared high-temperature vulcanized silicone rubber insulating material has tracking resistance and electric corrosion resistance of TMA3.5kV level.
Preferably, the second formula of the high-temperature vulcanized silicone rubber insulating material comprises:
100 parts of methyl vinyl silicone rubber, 58 parts of aluminum hydroxide, 25 parts of fumed silica, 7.5 parts of a coloring agent, 1 part of hydroxyl silicone oil, 6 parts of methyl silicone oil and 0.8 part of a bis-penta vulcanizing agent.
More preferably, the colorant in the formula II is ferric oxide, and the high-temperature vulcanized silicone rubber insulating material is red; and the prepared high-temperature vulcanized silicone rubber insulating material has tracking resistance and electric corrosion resistance of TMA2.5kV level.
In a second aspect, the invention provides a preparation method of more than one high-temperature vulcanized silicone rubber insulating material, which comprises the following steps:
1) mixing the raw materials according to a formula to obtain a mixed rubber material;
2) mixing the mixed rubber material to obtain mixed rubber;
3) and placing the rubber compound into a mold for molding and carrying out high-temperature vulcanization to obtain the high-temperature vulcanized silicone rubber insulating material.
Based on the preparation method of the present invention, preferably, the preparation method comprises the following steps:
1) pouring the metered methyl vinyl silicone rubber in parts by weight into a kneader for stirring, then pouring the metered fumed silica and aluminum hydroxide in parts by weight into the kneader for stirring successively, adding the metered methyl silicone oil, hydroxyl silicone oil, bis-penta vulcanizing agent and coloring agent in parts by weight in the middle process, stirring and mixing to obtain a mixed sizing material, wherein the whole process lasts for 30-40 min;
2) taking out the mixed rubber material, mixing the mixed rubber material by using an open mill for 10-15 min to obtain mixed rubber, and storing the mixed rubber for later use;
3) and placing the mixed rubber into a mold for molding, and placing the mixed rubber into a high-temperature vulcanizing machine for high-temperature vulcanization, wherein the vulcanization temperature is 170-185 ℃, and the duration is 11-17 min, so as to obtain the high-temperature vulcanized silicone rubber insulating material.
The formula of the high-temperature vulcanized silicone rubber material is repeatedly adjusted and tested, and the formula which can adjust the electric corrosion resistance and the tracking resistance from TMA4.5kV to TMA3.5kV and TMA2.5kV and correspondingly improve the crude rubber content of the silicone rubber is determined. And small-range trial operation proves that the electric power insulator operation requirement of the high-temperature vulcanized silicone rubber material can be met when the electric power insulator has the electric corrosion resistance and the tracking resistance which are greatly lower than TMA4.5kV and only reach TMA2.5kV, and the service life of the electric power insulator of the high-temperature vulcanized silicone rubber material can be prolonged by greatly increasing the raw rubber content of the silicone rubber in the material.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
Example 1
This example provides a high-temperature vulcanized silicone rubber insulating material for composite insulators, which has tracking resistance and galvanic corrosion resistance of tma3.5kv class.
The high-temperature vulcanized silicone rubber insulating material comprises the following components in parts by weight: 100 parts of methyl vinyl silicone rubber, 90 parts of aluminum hydroxide, 35 parts of fumed silica, 10 parts of ferric oxide, 3.5 parts of hydroxyl silicone oil, 5.5 parts of methyl silicone oil and 1.0 part of bis-dipenta vulcanizing agent.
The preparation process comprises the following steps:
1) pouring the metered methyl vinyl silicone rubber in parts by weight into a kneader for stirring, then pouring the metered white carbon black and aluminum hydroxide in parts by weight into the kneader for stirring successively, adding the metered methyl silicone oil, hydroxyl silicone oil, bis-penta vulcanizing agent and ferric oxide in parts by weight in the middle process, and stirring and mixing fully, wherein the whole process lasts for 30-40 min;
2) taking out the mixed rubber material after being fully stirred, mixing the mixed rubber material by using an open mill for 15min, and storing the mixed rubber material for later use;
3) and (3) placing the mixed rubber into a mold for molding, and placing the mixed rubber into a high-temperature vulcanizing machine for high-temperature vulcanization, wherein the vulcanization temperature is 180 ℃, the duration time is 15min, and the preparation of the high-temperature vulcanized silicone rubber is finished.
And (3) performance testing:
the weight ratio of the silicon rubber raw rubber is as follows: 40.8 percent
Resistance to electrical erosion and tracking: TMA3.5kV
Flammability: FV-0 grade
Volume resistivity: 2.26 to 4.49 x 1013Omega m (standard requirement: ≥ 1.0X 1012 omega m)
Breakdown strength: 22.7 to 27.9kV/mm (standard requirement: ≥ 20.0kV/mm)
Tear strength: 16.9 to 19.8kN/m (standard requirement:. gtoreq.10.0 kN/m)
Mechanical tensile strength: 5.21 to 5.64MPa (standard requirement: ≥ 4.0MPa)
Elongation at break: 364-381% (standard requirement ≥ 150%)
Hardness change rate: 5.55-6.85% (standard requirement: ≤ 20%)
Hydrophobicity: HC1 (Standard requirement: HC 1-HC 2)
Loss of hydrophobicity: HC2 (Standard requirement: HC 3-HC 4)
And (3) hydrophobic property recovery: HC1 (Standard requirement: HC 2-HC 3 +)
Migration of hydrophobicity: HC3 (Standard requirement: HC 2-HC 3)
The high-temperature vulcanized silicone rubber insulating material for the composite insulator has tracking resistance and electric erosion resistance of TMA3.5kV level, the weight ratio of the silicone rubber raw rubber is more than or equal to 40%, and other properties meet the requirements of general technical conditions of insulating materials for polymer insulator sheds and sheaths DL/T376-2019.
Example 2
This example provides a high-temperature vulcanized silicone rubber insulating material for composite insulators, which has tracking resistance and galvanic corrosion resistance of tma2.5kv class.
The high-temperature vulcanized silicone rubber insulating material comprises the following components in parts by weight: 100 parts of methyl vinyl silicone rubber, 58 parts of aluminum hydroxide, 25 parts of fumed silica, 7.5 parts of ferric oxide, 1 part of hydroxyl silicone oil, 6 parts of methyl silicone oil and 0.8 part of bis-dipenta vulcanizing agent.
The preparation process comprises the following steps:
1) pouring the metered methyl vinyl silicone rubber in parts by weight into a kneader for stirring, then pouring the metered white carbon black and aluminum hydroxide in parts by weight into the kneader for stirring successively, adding the metered methyl silicone oil, hydroxyl silicone oil, bis-penta vulcanizing agent and ferric oxide in parts by weight in the middle process, and stirring and mixing fully, wherein the whole process lasts for 30-40 min;
2) taking out the mixed rubber material after being fully stirred, mixing the mixed rubber material by using an open mill for 15min, and storing the mixed rubber material for later use;
3) and (3) placing the mixed rubber into a mold for molding, and placing the mixed rubber into a high-temperature vulcanizing machine for high-temperature vulcanization, wherein the vulcanization temperature is 180 ℃, the duration time is 15min, and the preparation of the high-temperature vulcanized silicone rubber is finished.
And (3) performance testing:
the weight ratio of the silicon rubber raw rubber is as follows: 50.4 percent
Resistance to electrical erosion and tracking: TMA2.5kV
Flammability: grade FV-1
Volume resistivity: 2.97 to 17.4 x 1013Omega.m (standard requirement: ≥ 1.0 × 10)12Ω·m)
Breakdown strength: 20.7 to 23.2kV/mm (standard requirement: ≥ 20.0kV/mm)
Tear strength: 18.1 to 20.9kN/m (standard requirement:. gtoreq.10.0 kN/m)
Mechanical tensile strength: 4.47 to 5.70MPa (standard requirement: ≥ 4.0MPa)
Elongation at break: 262-376% (standard requirement: > 150%)
Hardness change rate: 6.45-9.67% (standard requirement: ≤ 20%)
Hydrophobicity: HC1 (Standard requirement: HC 1-HC 2)
Loss of hydrophobicity: HC2 (Standard requirement: HC 3-HC 4)
And (3) hydrophobic property recovery: HC1 (Standard requirement: HC 2-HC 3)
Migration of hydrophobicity: HC 2-HC 3 (standard requirements: HC 2-HC 3)
The high-temperature vulcanized silicone rubber insulating material for the composite insulator has the tracking resistance and the electrical erosion resistance of TMA2.5kV level, the flame retardance of FV-1 level, the weight ratio of the silicone rubber crude rubber is more than or equal to 50 percent, and other properties all meet the requirements of 'general technical conditions of insulating materials for polymer insulator sheds and sheaths' DL/T376-2019.
Comparative example 1
The comparative example provides a high-temperature vulcanized silicone rubber insulating material for a composite insulator, and the tracking resistance and the electrical erosion resistance of the insulating material are TMA4.5 kV.
The high-temperature vulcanized silicone rubber insulating material comprises the following components in parts by weight: 100 parts of methyl vinyl silicone rubber, 123 parts of aluminum hydroxide, 39 parts of fumed silica, 11 parts of ferric oxide, 5.0 parts of hydroxyl silicone oil, 6.0 parts of methyl silicone oil and 1.2 parts of bis-penta vulcanizing agent.
The preparation process comprises the following steps:
1) pouring the metered methyl vinyl silicone rubber in parts by weight into a kneader for stirring, then pouring the metered white carbon black and aluminum hydroxide in parts by weight into the kneader for stirring successively, adding the metered methyl silicone oil, hydroxyl silicone oil, bis-penta vulcanizing agent and ferric oxide in parts by weight in the middle process, and stirring and mixing fully, wherein the whole process lasts for 30-40 min;
2) taking out the mixed rubber material after being fully stirred, mixing the mixed rubber material by using an open mill for 15min, and storing the mixed rubber material for later use;
3) and (3) placing the mixed rubber into a mold for molding, and placing the mixed rubber into a high-temperature vulcanizing machine for high-temperature vulcanization, wherein the vulcanization temperature is 180 ℃, the duration time is 15min, and the preparation of the high-temperature vulcanized silicone rubber is finished.
And (3) performance testing:
the weight ratio of the silicon rubber raw rubber is as follows: 35.1 percent of
Resistance to electrical erosion and tracking: TMA4.5kV class (Standard requirement: TMA4.5kV class)
Flammability: FV-0 level (Standard requirement: FV-0 level)
Volume resistivity: 2.99 to 3.29 x 1013Omega.m (standard requirement: ≥ 1.0 × 10)12Ω·m)
Breakdown strength: 21.7 to 22.1kV/mm (standard requirement: ≥ 20.0kV/mm)
Tear strength: 16.4 to 19.7kN/m (standard requirement:. gtoreq.10.0 kN/m)
Mechanical tensile strength: 4.46 to 4.74MPa (standard requirement: ≥ 4.0MPa)
Elongation at break: 258 to 297 percent (standard requirement ≥ 150 percent)
Hardness change rate: 2.04-2.66% (standard requirement:nomore than 20%)
Hydrophobicity: HC1 (Standard requirement: HC 1-HC 2)
Loss of hydrophobicity: HC2 (Standard requirement: HC 3-HC 4)
And (3) hydrophobic property recovery: HC1 (Standard requirement: HC 2-HC 3)
Migration of hydrophobicity: HC2 (Standard requirement: HC 2-HC 3)
The high-temperature vulcanized silicone rubber insulating material for the composite insulator of the comparative example meets the requirements of 'general technical conditions of polymer insulator sheds and insulating materials for sheaths' DL/T376-2019, but the content (weight part) of the raw silicone rubber is only 35.1%, 86% and 69.6% of the raw silicone rubber of example 1 and example 2, namely compared with the comparative example, the raw silicone rubber of example 1 and example 2 can maintain longer consumption time in the operation of the composite insulator and has longer operation life.
Application example:
the high-temperature vulcanized silicone rubber insulating materials for composite insulators obtained in examples 1 and 2 were subjected to a small-scale trial operation, wherein the composite insulator of the high-temperature vulcanized silicone rubber material having tma2.5kV resistance to corrosion and tracking had been subjected to an online operation at underwriters 110kV for 1 year and 7 months (12/6/2018-2020 and 6/28 days), and the composite insulator of the high-temperature vulcanized silicone rubber material having tma3.5kV resistance to corrosion and tracking had been subjected to an operation for more than 1 year (4/23/2019-so far).
A trial run sample of the composite insulator with the electric erosion resistance and the tracking resistance of TMA2.5kV is taken back to a laboratory, and detection according to a sampling test item shows that all properties of the trial run insulator are qualified and can be run for a long time. The following focuses on the performance indicators associated with this patent.
(1) The hydrophobicity is a key index for reflecting the excellent anti-pollution flashover performance and the operation life of the composite insulator, and the insulator sample with the silicon rubber crude rubber content of more than 50 percent still has excellent hydrophobicity after 1 year and 7 months of operation, which is in the hope.
Hydrophobicity: HC2 (Standard requirement: hydrophobicity grading is not lower than HC 3-HC 4)
Loss of hydrophobicity: HC4 (Standard requirement: hydrophobicity grading is not lower than HC 4-HC 5)
And (3) hydrophobic property recovery: HC2 (Standard requirement: hydrophobicity grading is not lower than HC 3-HC 4)
Migration of hydrophobicity: HC 2-HC 3 (standard requirement: hydrophobicity grading is not lower than HC 4-HC 5)
(2) The anti-electric erosion and tracking performance is a performance index which is very important in the early development stage of the composite insulator until the present time, and in order to accelerate the verification of the discharge corrosion resistance of a test article during operation, an upper equalizing ring and a lower equalizing ring of the insulator are not installed according to the normal design, namely, an umbrella skirt sheath on the high-voltage side of the insulator can bear the corrosion of the discharge forms of corona and the like during the operation. In fact, after the insulator test sample without the grading ring is taken down, a circle of obvious black ring appears on the high-voltage side jackets of 6 test samples (2 of B phase are particularly serious), and the phenomenon that the dirt deposit layer on the surface of the insulator is blackened by the discharge ablation of corona and the like at the high-voltage end during the long-term operation is proved; however, after the dirt deposit layer is wiped off, no galvanic corrosion sign appears on the surface of the silicone rubber sheath, which shows that the galvanic corrosion resistance and the tracking resistance of TMA2.5kV can meet the actual operation requirements of the composite insulator.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (10)
1. A high-temperature vulcanized silicone rubber insulating material for a composite insulator is characterized by comprising the following raw materials in parts by weight in a formula I or a formula II:
the formula I is as follows: 100 parts of methyl vinyl silicone rubber, 80-100 parts of aluminum hydroxide, 30-40 parts of fumed silica, 7.5-12.5 parts of a coloring agent, 2.5-4.0 parts of hydroxyl silicone oil, 4.0-7.0 parts of methyl silicone oil and 1.0-1.5 parts of a dipenta vulcanizing agent;
and a second formula: 100 parts of methyl vinyl silicone rubber, 50-70 parts of aluminum hydroxide, 20-30 parts of fumed silica, 5-10 parts of a coloring agent, 0.6-1.2 parts of hydroxyl silicone oil, 4.0-8.0 parts of methyl silicone oil and 0.5-1.0 part of a dipenta vulcanizing agent.
2. A high temperature vulcanized silicone rubber insulation material as recited in claim 1, wherein the high temperature vulcanized silicone rubber insulation material produced in formulation one has tracking resistance and galvanic corrosion resistance of not less than TMA3.5kV level.
3. A high temperature vulcanized silicone rubber insulation material as recited in claim 1, wherein the high temperature vulcanized silicone rubber insulation material produced by formulation two has tracking resistance and galvanic corrosion resistance of not less than TMA2.5 kV.
4. A high temperature vulcanized silicone rubber insulation material as set forth in any one of claims 1-3 wherein said colorant comprises iron sesquioxide.
5. A high temperature vulcanized silicone rubber insulation as recited in claim 1, wherein formulation one comprises:
100 parts of methyl vinyl silicone rubber, 90 parts of aluminum hydroxide, 35 parts of fumed silica, 10 parts of a coloring agent, 3.5 parts of hydroxyl silicone oil, 5.5 parts of methyl silicone oil and 1.0 part of a bis-dipenta vulcanizing agent.
6. A high temperature vulcanized silicone rubber insulation material as set forth in claim 1 or 5 wherein said coloring agent is iron trioxide;
the high-temperature vulcanized silicone rubber insulating material prepared by the first formula has the tracking resistance and the electric corrosion resistance of TMA3.5kV level.
7. A high temperature vulcanized silicone rubber insulation material as recited in claim 1, wherein formulation two comprises:
100 parts of methyl vinyl silicone rubber, 58 parts of aluminum hydroxide, 25 parts of fumed silica, 7.5 parts of a coloring agent, 1 part of hydroxyl silicone oil, 6 parts of methyl silicone oil and 0.8 part of a bis-penta vulcanizing agent.
8. A high temperature vulcanized silicone rubber insulation material as set forth in claim 1 or 7 wherein said coloring agent is iron trioxide;
the high-temperature vulcanized silicone rubber insulating material prepared by the formula II has the tracking resistance and the electric corrosion resistance of TMA2.5kV level.
9. A method of preparing a high temperature vulcanized silicone rubber insulation material according to any one of claims 1 to 8, comprising the steps of:
1) mixing the raw materials according to a formula to obtain a mixed rubber material;
2) mixing the mixed rubber material to obtain mixed rubber;
3) and placing the rubber compound into a mold for molding and carrying out high-temperature vulcanization to obtain the high-temperature vulcanized silicone rubber insulating material.
10. The method of manufacturing according to claim 9, comprising the steps of:
1) pouring the metered methyl vinyl silicone rubber in parts by weight into a kneader for stirring, then pouring the metered fumed silica and aluminum hydroxide in parts by weight into the kneader for stirring successively, adding the metered methyl silicone oil, hydroxyl silicone oil, bis-penta vulcanizing agent and coloring agent in parts by weight in the middle process, stirring and mixing to obtain a mixed sizing material, wherein the whole process lasts for 30-40 min;
2) taking out the mixed rubber material, mixing the mixed rubber material by using an open mill for 10-15 min to obtain mixed rubber, and storing the mixed rubber for later use;
3) and placing the mixed rubber into a mold for molding, and placing the mixed rubber into a high-temperature vulcanizing machine for high-temperature vulcanization, wherein the vulcanization temperature is 170-185 ℃, and the duration is 11-17 min, so as to obtain the high-temperature vulcanized silicone rubber insulating material.
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| CN116082846A (en) * | 2023-01-05 | 2023-05-09 | 湖南防灾科技有限公司 | Composition for composite silicone rubber material, preparation method and application thereof |
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