The article is devoted to an easy and effective method of giving polypropylene yarns the same extremely high chemical resistance as fluoropolymers yarns has. The method is based on the formation of an ultrathin, continuous and even coating of polytetrafluoroethylene on a surface of each filament forming yarn. The adhesion of a polytetrafluoroethylene coating to polypropylene is provided by applying of a diluted suspension of high-disperse polytetrafluoroethylene on a surface of a semi-hardened polypropylene yarn at the oiling stage. Later, the yarn is subjected to orientational stretching. In the process of stretching the coating becomes uniform and oriented thanks to an ability of polytetrafluoroethylene to pseudo-fluidity and a high coefficient of thermal expansion. The polypropylene yarn with a polytetrafluoroethylene coating gets an extremely high resistance to the influence of nitric acid and sodium hydroxide. Its frictional coefficient is close to the frictional coefficient of polytetrafluoroethylene and the strength is much higher than the strength of a common polypropylene yarn. The applied coating has a high resistance to the intensive abrasive action.

该制品致力于提供一种简单有效的方法，使聚丙烯纱线具有与含氟聚合物纱线相同的极高的耐化学性。该方法基于在每根长丝形成纱线的表面上形成聚四氟乙烯的超薄，连续且均匀的涂层。聚四氟乙烯涂层对聚丙烯的粘附力是通过在上油阶段将稀释的高分散聚四氟乙烯悬浮液施加到半硬化聚丙烯纱线的表面上来提供的。之后，将纱线进行定向拉伸。在拉伸过程中，由于聚四氟乙烯具有伪流动性和高热膨胀系数，涂层变得均匀且定向。带有聚四氟乙烯涂层的聚丙烯纱线对硝酸和氢氧化钠的影响具有极高的抵抗力。它的摩擦系数接近于聚四氟乙烯的摩擦系数，其强度远高于普通聚丙烯纱线的强度。所施加的涂层对强烈的磨蚀作用具有很高的抵抗力。