New Development of Modified Polytetrachloroethylene Mechanical Seal Materials
2016-12-26
New development of modified polytetrachloroethylene
mechanical seal materials. Polytetrachloroethylene (PTFE) has the advantages of good chemical stability, low friction coefficient, wide temperature range (-240~260T), no stickiness, no pollution, etc., making it another widely used sealing material material. However, as a sealing material, its large creep and poor resilience become the fatal injury of PTFE.
It used to be replaced by sandalwood instead of PTFE. This should be no problem in theory, but in fact, there are still problems such as difficult processing, surface buckling or damage to the coating layer, which causes media erosion. Therefore, it can only be changed The performance of PTFE can be improved by the method of sex or filling. For example, the expanded PTFE sealing tape introduced in the early years is one of the modified products. However, there are still two problems: First, due to process reasons, the filling material is difficult to disperse uniformly, resulting in temperature anisotropy and uneven points, which cannot reduce creep; second, it is difficult to make it due to traditional processing methods (molding and sintering) The large thin plate brings inconvenience to the gasket processing.
In recent years, Gore Company has introduced expanded polytetrachloroethylene sealing plate (丨.22mxl.42n〇, without any adhesive or filling material, and its compression performance (40%), high temperature resistance (315 degrees Celsius), Compared with pure tetrachloride, the creep relaxation rate is lower (32.8%/100°C*22h), and it is easy to cut and install, and the required gasket stress is small. 215.html,
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