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发明公开
CN104945794A 一种填充改性PTFE密封板材及其制备方法 有权

一种填充改性PTFE密封板材及其制备方法
摘要：
本发明涉及一种填充改性PTFE密封板材，原料组分包括：30-70wt%的聚四氟乙烯、10-60wt%的含硅物质和2-25wt%的滑石粉；制备过程为：（1）将各原料混合搅拌，搅拌过程加入加工助剂，形成均匀混合物；（2）利用挤出机将上述混合物挤出成形，形成预成形体；（3）使上述形成的预成形体通过轧辊轧制成片材；（4）干燥去除加工助剂；（5）烧结即制得所述的填充改性PTFE密封板材；本发明制备的填充改性PTFE密封板材具有聚四氟乙烯用量低的特点，且同时具有低蠕变松弛和高密封性能。
摘要（英）：

The invention relates to a filling-modified PTFE (polytetrafluoroethylene) sealing plate comprising the following raw material components: 30-70wt% of PTFE, 10-60wt% of silicon-containing substances and 2-25wt% of talcum powder. The preparation process of the filling-modified PTFE sealing plate comprises the steps of (1) mixing and stirring all raw materials, and adding a processing aid in the stirring process to form a uniform mixture; (2) extruding and forming the mixture by using an extruder to form a pre-formed body; (3) rolling the formed pre-formed body by using a roller to form a sheet; (4) drying and removing the processing aid; and (5) sintering to obtain the filling-modified PTFE sealing plate. The filling-modified PTFE sealing plate prepared by the invention has the characteristics of low PTFE dosage and also has low creep relaxation and high sealing performance.

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