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Thermal analysis method for measuring contents of polydimethylsiloxane (PDMS), SiO2 and aluminum hydroxide (ATH) in silicone rubber composite insulator

A composite insulator and silicone rubber insulation technology, which is applied in the thermal development of materials, instruments, calculations, etc., can solve the problem of the lack of systematic and effective components of silicone rubber insulators

Active Publication Date: 2014-12-24
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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Problems solved by technology

[0004] At present, the power industry still lacks systematic and effective characterization methods for the detection of the content of silicone rubber insulator components

Method used

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  • Thermal analysis method for measuring contents of polydimethylsiloxane (PDMS), SiO2 and aluminum hydroxide (ATH) in silicone rubber composite insulator
  • Thermal analysis method for measuring contents of polydimethylsiloxane (PDMS), SiO2 and aluminum hydroxide (ATH) in silicone rubber composite insulator
  • Thermal analysis method for measuring contents of polydimethylsiloxane (PDMS), SiO2 and aluminum hydroxide (ATH) in silicone rubber composite insulator

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Embodiment 1 A silicone rubber insulator with a certain component (PDMS is 120 parts, ATH is 80 parts, and white carbon black is 25 parts), the calculation method of its component content comprises the following steps:

[0055] (1) The thermal weight loss rate of silicone rubber at 20-360° C. is 12.63%, and the thermal weight loss rate of silicone rubber at 360-700° C. is 43.65% as measured by analysis software.

[0056] (2) Using analysis software to measure PDMS, ATH, SiO at 20-360°C 2 The thermal weight loss rates are 2.85%, 30.49%, and 1.81%, respectively, and the equation ① can be obtained: 12.63%=(m ATH ×30.49%+100×2.85%+m SiO2 ×1.81%) / (m ATH +100+m SiO2 ).

[0057] (3) Use analysis software to measure PDMS, ATH, SiO at 360-700°C 2 The thermal weight loss rates are 77.22%, 5.17%, and 0.67%, respectively, and the equation ② can be obtained: 43.65%=(m ATH ×5.17%+100×77.22%+m SiO2 ×0.67%) / (m ATH +100+m SiO2 ).

[0058] (4), solve equations ①② to get: m ATH...

Embodiment 2

[0062] Embodiment 2 A silicone rubber insulator with a certain component (PDMS is 120 parts, ATH is 110 parts, and white carbon black is 25 parts), the calculation method of its component content comprises the following steps:

[0063] (1) The thermal weight loss rate of silicone rubber is 15% at 20-360°C and 38.68% at 360-700°C by analysis software.

[0064] (2) Using analysis software to measure PDMS, ATH, SiO at 20-360°C 2 The thermal weight loss rates are 2.85%, 30.49%, and 1.81%, respectively, and the equation ① can be obtained: 12.63%=(m ATH ×30.49%+100×2.85%+m SiO2 ×1.81%) / (m ATH +100+m SiO2 ).

[0065] (3) Use analysis software to measure PDMS, ATH, SiO at 360-700°C 2 The thermal weight loss rates are 77.22%, 5.17%, and 0.67%, respectively, and the equation ② can be obtained: 43.65%=(m ATH ×5.17%+100×77.22%+m SiO2 ×0.67%) / (m ATH +100+m SiO2 ).

[0066] (4), solve equations ①② to get: m ATH =94.11,m SiO2 =18.43.

[0067] (5), calculate the mass fraction of ...

Embodiment 3

[0069] Embodiment 3 A certain component (120 parts of PDMS, 160 parts of ATH, and 25 parts of white carbon black) of a silicone rubber insulator, the calculation method of its composition comprises the following steps:

[0070] (1) The thermal weight loss rate of silicone rubber is 17.35% at 20-360°C and 32.81% at 360-700°C by analysis software.

[0071] (2) Using analysis software to measure PDMS, ATH, SiO at 20-360°C 2 The thermal weight loss rates are 2.85%, 30.49%, and 1.81%, respectively, and the equation ① can be obtained: 17.35%=(m ATH ×30.49%+100×2.85%+m SiO2 ×1.81%) / (m ATH +100+m SiO2 ).

[0072] (3) Use analysis software to measure PDMS, ATH, SiO at 360-700°C 2 The thermal weight loss rates are 77.22%, 5.17%, and 0.67%, respectively, and the equation ② can be obtained: 32.81%=(m ATH ×5.17%+100×77.22%+m SiO2 ×0.67%) / (m ATH +100+m SiO2 ).

[0073] (4), solve equations ①② to get: m ATH =135.71,m SiO2 =21.47.

[0074] (5), calculate the mass fraction of each...

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Abstract

The invention relates to a thermal analysis method for measuring the contents of polydimethylsiloxane (PDMS), SiO2 and aluminum hydroxide (ATH) in a silicone rubber composite insulator. The method comprises the steps of S1, respectively measuring the thermal gravity loss (TG) curves of the PDMS, the ATH and the SiO2 for three times by a thermal gravity loss-differential thermal analysis combination comprehensive thermal analyzer, and averaging; S2, cutting three parts from the silicone rubber insulator randomly, wherein the cut parts have the sizes of 1cm*1cm and the masses within the range of 5-50mg; pretreating, then measuring the TG curves of the silicone rubber insulator for three times, and averaging; S3, calculating the thermal weight loss rates of the PDMS, the ATH, the SiO2 and the silicone rubber insulator in the ranges of 20-360 DEG C and 360-700 DEG C according to the TG curves; S4, substituting the obtained numerical values into the formula delta M=(m(ATH)*deltam(ATH)+m(PDMS)*delta m(PDMS)+m(SiO2)*delta m(SiO2)) / (m(ATH)+m(PDMS)+m(SiO2)); and S5, working out the equation in the S4, and calculating the contents of the ATH and the SiO2 relative to the PDMS. According to the method, the contents of the three components of the silicone rubber composite insulator can be worked out by utilizing the thermal weight loss rates of the three components in the respective specific thermal decomposition temperature ranges, and a concrete calculation method is provided.

Description

technical field [0001] The invention relates to a method for determining polydimethylsiloxane, white carbon black powder and aluminum hydroxide powder (PDMS, SiO2) in silicone rubber composite insulators. 2 , ATH) content thermal analysis method. Background technique [0002] In high-voltage transmission lines, the service life of composite insulator strings determines the operating life of the entire transmission line. Therefore, how to screen out composite insulators with excellent quality and good performance and put them into use is very important. [0003] However, for the relevant departments of the power industry, there are certain technical difficulties in the detection of the content of each component in composite insulators, especially the detection of the content of white carbon black and aluminum powder. Composite insulators with a slightly higher content of white carbon black and aluminum powder have a great advantage in price compared with other types of insul...

Claims

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Application Information

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IPC IPC(8): G01N25/20G06F19/00
Inventor 许志海余欣王锐彭向阳方鹏飞王建国汪政
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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