The Study of Optimized Thermal Treatment Condition of Polyvinylidene Fluoride (PVDF) on Galvanized Steel as Pre-Coated Metal (PCM)

摘要

There are many kinds of coating materials and methods for industrial use. Among of these, coil coating process using applicator roll is the most effective one for mass production. The speed of manufacture is over 120 meter per minute and the coated surface have uniform quality than spray, dipping, casting coating method, and etc. Many types of coating materials are using for roll coating, and most of these are organic or organic/inorganic hybrid materials. In the case of these organic or hybrid coating materials, it composed of various row materials. Typically, resins or paints for coil-coating are composed of various organic polymer binders, additives and pigments. These coating materials are classified by the type of polymer. There are many kinds of polymer binders and polyester(PE), silicon-polyester(SiPE), polyurethane(PU), polyvinylidene fiuoride(PVDF) are mainly used because of their proper cost and characteristics. Among these, PVDF paints have so good formability and weatherability that usually warranted over 20 years. Due to this reason, this kind of product is more expensive than others, so we should pay a lot of compensation for the customer claims. Sometimes delamination of PVDF from substrate is occurred in using fields, but immediate occasion have not identified yet. Therefore, we have tried to know the factors of this problem, and finally confirmed that thermal treatment condition can affect to physical properties of PVDF. In this study, we researched affection of temperature when PVDF is curing and cooling as coil, and when it is forming as panel. To investigate change of properties, some kind of analysis equipment were used such as scanning electron microscope(SEM), fourier transform infrared spectroscopy(FT-IR), optical microscope etc.