Method for sintering polytetrafluoroethylene

A polytetrafluoroethylene and sintering furnace technology, which is applied in the chemical and chemical industry, can solve the problems of highly toxic, non-wear-resistant polytetrafluoroethylene, affecting product performance, appearance, etc., to achieve good sealing effect, strengthen the sealing effect, The effect of suppressing the evolution of hydrogen fluoride
CN102205651AActive Publication Date: 2011-10-05广东新志密封技术有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
广东新志密封技术有限公司
Publication Date
2011-10-05

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Abstract

The invention provides a method for sintering a polytetrafluoroethylene sealing ring. The invention employs a sintering furnace which comprises a sintering furnace body, a nitrogen conveying device and a program control device. The sintering furnace body comprises four zones such as a drying zone (2), a preheating zone (3), a sintering zone (4) and a cooling zone (5). The method comprises the following steps: (1) preparing polytetrafluoroethylene stock;(2)drying polytetrafluoroethylene stock in the drying zone; (3) preheating stock in the preheating zone; (4) sintering stock in sintering zone; (5)cooling. According to the invention, the sintering sealing effect and automatic control can be enhanced for effectively inhibiting the escape of hydrogen fluoride during the sintering process, metal powder modified materials filled in polytetrafluoroethylene is avoided an oxidation generated by contacting with air in a high temperature through a heat nitrogen cycle, thereby the usage performance and the appearance of the products can be improved.
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Description

technical field

[0001] The invention relates to the technical field of chemistry and chemical engineering, in particular to a method for sintering polytetrafluoroethylene. Background technique

[0002] Polytetrafluoroethylene (PTFE) has excellent chemical stability, corrosion resistance, sealing, high lubrication and non-stickiness, electrical insulation and good aging resistance, and excellent temperature resistance (can be used at +250°C to -180°C Long-term work at high temperature), but its fluidity is poor, it is easy to decompose, and it is a polymer material that generates corrosive gas when decomposed. In the molding process, the temperature must be strictly controlled. If the temperature is not properly controlled, hydrogen fluoride will decompose and escape, causing poisoning of animals and humans within 2 square kilometers. At present, the recycling technology of polytetrafluoroethylene is not yet mature, and it is generally formed at one time, so there is no room...

Claims

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