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    Home > Coatings News > Paints and Coatings Market > Outer coating process of anticorrosive fusion bonded epoxy powder steel pipe

    Outer coating process of anticorrosive fusion bonded epoxy powder steel pipe

    • Last Update: 2020-03-04
    • Source: Internet
    • Author: User
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    In this process, the coating melts and flows fully, covers the whole steel pipe surface, and there is no gap between the coating and the substrate, and forms a chemical bond to some extent, with the bonding force up to 433kg / cm2 The resin itself is heated, solidified and crosslinked to form a continuous thermosetting polymer At present, the domestic commonly used assembly line coating process The production process is highly efficient and reliable, with high degree of automation, minimizing human factors Each process is standardized and tested by mature international and domestic standards Depending on the size of pipe diameter, the maximum speed can reach 6-7 meters per minute There is no volatiles and three wastes pollution The polluted steel pipe surface has adverse effect on the performance of any coating, and the fusion bonded epoxy anticorrosive coating is no exception Surface treatment generally refers to sand blasting, and chemical treatment can be added in special cases, but it is not widely used Before sand blasting, if there is oil on the steel pipe, the oil shall be washed away first The so-called sand blasting is to use centrifugal shot blasting machine to spray steel sand to the steel pipe surface at high speed, clean the rust layer, form anchor lines, and remove the surface dust Generally, it reaches grade Sa2.5 and the depth of anchor pattern is 40-100um The high-level surface treatment, as well as the depth and shape of the anchor lines in the production process of anticorrosive fusion bonded epoxy powder coating ensure the excellent performance of the anticorrosive coating on the other hand - heating of steel pipe After surface treatment, the steel pipe is uniformly heated by a non polluting heat source At present, electric induction heating or flame heating are generally used The heating temperature can be adjusted according to the production speed, the thickness of the pipe wall, as well as the desired coating gelation and curing time, generally around 230 ℃ Electric induction heating: the steel pipe is heated by eddy current through the alternating magnetic field formed by the coil with alternating large current - powder coating Coating equipment generally includes fluidized bed, powder room with electrostatic spray gun, and recovery system Firstly, the epoxy powder is fully fluidized in the fluidized bed, and then the powder particles are negatively charged through the electrostatic spray gun, and uniformly adhere to the surface of the grounded and preheated steel pipe For a small amount of diffused powder, it can be recovered through the recovery system, which will not cause dust pollution and no volatiles It is an environmental protection product The thickness of the coating is regulated by the amount of coating and production speed, generally 350um -- powder melting, flowing, bonding and curing The epoxy powder adhered to the surface of the preheating steel pipe is heated and melted, and flows, further leveling covers the whole steel pipe surface, especially in the depression of the steel pipe surface, as well as on both sides of the weld bead, the molten coating flows into the filling, so that the coating and the steel pipe are closely combined, minimizing the gap After leveling, the coating is further gelled and solidified According to different production speed, as well as the requirements of gelation, curing temperature and time, there are different types of powder corresponding to it.
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