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采用冷压和自由烧结工艺制备硫酸钡填充改性聚四氟乙烯(PTFE)密封材料。实验研究了硫酸钡表面处理方法、颗粒粒径及其体积含量对材料性能的影响,并对改性机理进行了分析。研究结果表明,采用钛酸酯偶联剂NDZ-401可以较好地改善填料颗粒和PTFE基体间的界面结合度,有利于提高材料性能;采用小粒径硫酸钡填充PTFE材料可有效降低材料的应力松弛率,但拉伸强度下降明显;大粒径硫酸钡的填充改性效果优于小粒径,且当其体积含量约为26%时,可获得综合性能较好的PTFE密封复合材料。
Preparation of Barium Sulfate Modified Polytetrafluoroethylene (PTFE) Sealing Material by Cold Pressing and Free Sintering Process. The effects of surface treatment method, particle size and volume fraction of barium sulfate on the properties of the materials were experimentally studied. The modification mechanism was also analyzed. The results show that the titanate coupling agent NDZ-401 can improve the interfacial bonding between the filler particles and the PTFE matrix, which is beneficial to improve the properties of the material. Filler with small particle size barium sulfate can effectively reduce the material’s Stress relaxation rate, but the tensile strength decreased obviously. The effect of filling and modification of large particle size barium sulphate is better than that of small particle size. When the volume content is about 26%, PTFE composite with good overall performance can be obtained.