Processing technology of high-temperature-resistant and long-life chromatographic gasket

A processing technology and long-life technology, applied in engine sealing, manufacturing tools, ceramic molding machines, etc., can solve problems such as high loss rate, air leakage, and low temperature resistance, so as to improve efficiency, reduce costs, and increase wear resistance The effect of consumption rate

Active Publication Date: 2014-12-10
SHANGHAI ANPEL SCI INSTR
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The pure graphite gasket used for the chromatographic column and the interface of the instrument on the gas chromatograph is the consumable with the largest loss rate in the use of the instrument. The service life of similar products is very short, no more than 50 times at most, and air leakage begins to be found at the seal, and there are also some People have used improved materials such as PTFE, although the service life can be extended to 80-100 times, but the temperature resistance is low, and the maximum temperature resistance does not exceed 250 degrees

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0006] This specific embodiment adopts the following technical scheme: the preparation of mixed raw materials: use a 1L glass stirred tank, add 10g of high-purity graphite powder and 0.5-2 grams of high-purity Vespel raw materials into the feeding port, and feed high-purity graphite powder at one end at 30ml / min. Nitrogen protection, adding a 5A molecular sieve dry filter to the nitrogen gas path to remove trace moisture in the gas path to ensure that the moisture content of the nitrogen gas is less than 10PPB. Because moisture has a great impact on the raw material, heat it to 400 degrees and stir it at a high speed , kept for 3-6 hours, then took samples to check the homogeneity of raw materials, stopped heating after meeting the specified indicators, stirred until room temperature, vented, and discharged; pressing and high-temperature purification of graphite pads: accurately weigh 0.5-1g of raw materials, and remove them from the mold Add slowly from the top, press molding,...

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Abstract

The invention relates to a processing technology of a high-temperature-resistant and long-life chromatographic gasket, and relates to the technical filed of gasket processing. A 1L glass stirring kettle is used, 10 g of high-purity graphite powder and 0.5-2g of high-purity Vespel raw material are respectively added through a charging port, high pure nitrogen is introduced at 30ml / min for protection, a 5A molecular sieve drying filter is added at a nitrogen gas path part, and the trace moisture in the gas path is removed to ensure that the moisture content of nitrogen is less than 10 PPB; because the moisture has a greater impact on the raw material, the raw material is heated to 400 degrees and stirred at a high speed for 3-6 hours; and then a sample is taken, the uniformity of the raw material is detected; after the specified index is reached, the heating is stopped, and the raw material is stirred until the temperature is room temperature; and the emptying and discharging are carried out. The high-temperature-resistant and long-life chromatographic gasket is prepared by a novel material formed by mixing a special material with pure graphite, and the service life of the chromatographic gasket is greatly prolonged.

Description

Technical field: [0001] The invention relates to the technical field of gasket processing, in particular to a processing technology for high-temperature-resistant and long-life chromatographic gaskets. Background technique: [0002] The pure graphite gasket used for the chromatographic column and the interface of the instrument on the gas chromatograph is the consumable with the largest loss rate in the use of the instrument. The service life of similar products is very short, no more than 50 times at most, and air leakage begins to be found at the seal, and there are also some People have used improved materials such as PTFE, although the service life can be extended to 80-100 times, but the temperature resistance is low, and the maximum temperature resistance does not exceed 250 degrees. Invention content: [0003] The purpose of the present invention is to provide a high-temperature-resistant and long-life chromatographic gasket processing technology, which uses special...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B3/02F16J15/00C04B26/20
Inventor 盛剑玉王冰张佳
Owner SHANGHAI ANPEL SCI INSTR
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