Any two solids, whether or not their chemical composition is the same, as long as their physical state is different, the internal structure of the charge carrier energy distribution is also different. When these two solid contact, charge redistribution occurs in a solid surface will, after their separation, each with a solid contact before an excess of positive (or negative) charge, this phenomenon is called static.
In the PVDF tube industry, contact of the same or different materials is very common. At this time, if an electron is transferred in the hundreds of atoms of the PVDF pipe, the polymer will have a considerable amount of charge and become a charged body. For example, polypropylene fiber due to friction generated by static electricity can reach more than 1500V. In the non-polar polymer material with high resistance and poor water absorption, the static electricity stored in the process of production often reaches the degree of hindering the smooth progress of production, and the quality of the product is also affected.
It is generally believed that when the PVDF tube is rubbed, the polymer with a large dielectric constant is positively charged and the dielectric constant is small and negatively charged. The charged sequence of some polymers is listed below:
When the two substances in the above sequence are rubbed, the surface of the material which is always placed in front of the sequence is positively charged and negatively charged on the surface of the material thereafter.
In general, electrostatic action is a disadvantage in the processing and use of PVDF pipes. First of all, the surface charge can cause the material to repel or attract other individual parts of electrostatic interaction, bring difficulties to some process; secondly, the electrostatic interaction often damage the quality of products, the common situation is caused by the surface adsorption of PVDF pipe.
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