High-performance tracking-resistant silicone rubber and preparation method thereof

A technology of electric leakage tracking and silicone rubber, applied in the fields of silicone rubber insulation materials and polymer insulation materials, can solve the problems of deteriorating processing performance and mechanical properties, damaging the processing performance and mechanical properties of silicone rubber, and complicated processes, so as to improve the resistance to Leakage tracking performance, overcoming poor mechanical properties, easy industrial production effect

Active Publication Date: 2015-10-14
SOUTH CHINA UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Chinese invention patent application CN104130580A uses various inorganic fillers such as aluminum hydroxide, zinc borate, and aluminum oxide to compound and fill a silicone rubber that is resistant to tracking. However, due to the large amount of filler added and poor compatibility, Deteriorated processability and mechanical properties
Lars E. Schmidt reported that the compound filling of melamine cyanurate and white carbon black can also significantly improve the tracking resistance and flame retardancy of silicone rubber, but there are also problems of poor compatibility and deterioration of mechanical properties (Tracking and erosion resistance of high temperature vulcanizing ATH-free silicone rubber, IEEE Transactions on Dielectric and Electrical Insulation, 2010,17(2):533-540)
Chinese invention patent application CN103642247A uses polymetallic organosiloxane, silane-treated aluminum hydroxide, nano-tin dioxide, etc. to improve the compatibility and tracking resistance of silicone rubber systems, and prepares a high-temperature resistant insulating silicone rubber. However, there are disadvantages such as large amount of filler added and complicated process.
[0004] To sum up, some progress has been made in the current anti-tracking silicone rubber, but the existing preparation methods still have shortcomings: the addition of anti-tracking additives often requires a large amount (>50wt%) to achieve a satisfactory The tracking resistance effect seriously damages the processing performance and mechanical properties of silicone rubber
This not only greatly limits the application range of silicone rubber insulating materials, but also affects the protective performance of silicone rubber products in long-term operation, and there are certain safety hazards

Method used

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  • High-performance tracking-resistant silicone rubber and preparation method thereof
  • High-performance tracking-resistant silicone rubber and preparation method thereof
  • High-performance tracking-resistant silicone rubber and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] 90 parts by mass of methyl vinyl silicone rubber (molecular weight 560,000) with 0.05 mol% vinyl content, 10 parts by mass of methyl vinyl silicone rubber (molecular weight 600,000) with 3 mol% vinyl content, 40 parts by mass of gas-phase method white carbon Black (specific surface area 260m 3 / g), 8 parts by mass of hydroxyl silicone oil (hydroxyl content 6wt%) and 0.6 parts by mass hydrogen-containing silicone oil (hydrogen content 1.2wt%) were mixed in a kneader, and kneaded at room temperature for 4h. Then heat to 150°C and continue kneading for 2h, then vacuum knead for 1h, and cool to room temperature to obtain a silicone rubber base rubber.

[0034] Add 2.5 parts by mass of ureapropyltrimethoxysilane (molecular formula: H 2 NCONHCH 2 CH 2 CH 2 Si(OCH 3 ) 3 ), 0.3 parts by mass of divinyltetramethyldisiloxane complex of chloroplatinic acid and 2 parts by mass of 2,5-dimethyl-2,5-di-tert-butylperoxyhexane, mixed evenly Film out later. Vulcanize at 165°C for...

Embodiment 2

[0037] The difference between this example and Example 1 is that 90 parts by mass of methyl vinyl silicone rubber with a vinyl content of 0.05 mol% and 10 parts by mass of a vinyl content of 3 mol% are converted into 50 parts by mass of 0.07 mol% vinyl content ( Molecular weight 600,000) and 50 parts by mass of methyl vinyl silicone rubber with 0.25 mol% vinyl content (molecular weight 600,000), 2.5 parts by mass of ureapropyltrimethoxysilane is converted into 1 part by mass of aminopropyltriethoxysilane (molecular formula: H 2 NCH 2 CH 2 CH 2 Si(OCH 2 CH 3 ) 3 ), the divinyltetramethyldisiloxane complex of 0.3 parts by mass of chloroplatinic acid was converted into 0.3 parts by mass of chloroplatinic acid tetrahydrofuran solution. The properties of the samples are shown in Table 1.

[0038] It can be seen from Table 1 that the silicone rubber of this embodiment can also pass the 1A4.5 level tracking resistance test. It shows that aminopropyltriethoxysilane and chlorop...

Embodiment 3

[0040] The difference between this example and Example 1 is that 90 parts by mass of methyl vinyl silicone rubber with a vinyl content of 0.05 mol% and 10 parts by mass of a vinyl content of 3 mol% are respectively converted into 80 parts by mass of a vinyl content of 0.05 mol% (molecular weight 560,000) and 20 parts by mass of 0.3mol% vinyl content (molecular weight 590,000) of methyl vinyl silicone rubber, 2.5 parts by mass of ureapropyltrimethoxysilane is converted into 2 parts by mass of guanidinepropyltriethoxysilane ( Molecular formula: H 2 NC(=NH)NHCH 2 CH 2 CH 2 Si(OCH 2 CH 3 ) 3 ). The properties of the samples are shown in Table 1.

[0041] It can be seen from Table 1 that the silicone rubber of this embodiment can pass the 1A4.5 level tracking resistance test, indicating that the complexation of guanidinyl triethoxysilane and chloroplatinic acid with divinyltetramethyldisiloxane At the same time, two kinds of silicone rubbers with different vinyl content can...

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Abstract

The invention discloses a high-performance tracking-resistant silicone rubber and a preparation method thereof. The tracking-resistant silicone rubber is prepared from the following raw materials in parts by mass: 100 parts of methylvinyl silicone rubber, 20-45 parts of fumed silica, 4-15 parts of hydroxy silicone oil, 0.3-1 part of hydrogen-containing silicone oil, 0.5-5 parts of nitrogenous silane, 0.1-2 parts of platinum compound and 0.5-4 parts of hexane 2,5-dimethyl-2,5-di-tert-butyl peroxide. The preparation method comprises the following steps: uniformly compounding the methylvinyl silicone rubber, fumed silica, hydroxy silicone oil and hydrogen-containing silicone oil in a kneader at room temperature, and carrying out heat treatment to obtain the silicone rubber basic rubber; and uniformly compounding the basic rubber and the other components in an open mill, and carrying out sectional vulcanization. The silicone rubber has excellent tracking resistance and mechanical properties, and can be used in the field of high-voltage insulation. The method has the advantages of accessible raw materials and simple processing technique, and is convenient for large-scale production.

Description

technical field [0001] The invention relates to the field of polymer insulating materials, in particular to the field of silicone rubber insulating materials, in particular to a high-performance tracking-resistant silicone rubber and a preparation method thereof. technical background [0002] The development of industry and society promotes the continuous updating of insulating materials. In the early days, the insulating materials used in high-voltage environments were almost all inorganic materials such as ceramics and glass. Although ceramic and glass insulating materials have good electrical properties and long-term operating experience, they have disadvantages such as fragility, non-pollution resistance, high production costs, and complicated processes. The emergence of organic polymer insulating materials has solved the above problems well. Compared with ceramics and glass, the unique performance characteristics of polymer materials, such as small mass, low cost, hyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/06C08L83/05C08K13/02C08K3/36C08K5/544C08K5/14C08K5/541
Inventor 曾幸荣陈宛涓赖学军李红强方伟镇张亚军
Owner SOUTH CHINA UNIV OF TECH
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