ポリ塩化ビニル被覆鋼板の耐久性に及ぼす皮膜に添加した無機粉末の影響

抄録

The effects of the addition of inorganic powders (tin, lead, zinc, copper, aluminum, stainless steel, titanium dioxide, iron oxide and mica) in PVC coatings on the durability of PVC coated steel sheet were studied. The durability of the PVC coatings was estimated by meaurement of photo-oxidative degradation, stress shrinkage and the invasion of corrosive materials. It was found that: 1) the addition of flaked powders to coatings reduced heat shrinkage and the rate of water vapor transmission to 50-80% of that standard specimens, while the addition of copper, zinc and iron oxide powders had adverse effects on resistance to heat and light; 2) the addition of flaked powders to coatings provided better adhesive strength after aging tests and superior corrosion resistance during cycle tests, which was relative to the results of heat shrinkage and water vapor transmission rate; 3) the addition of more than 10phr of aluminum flaked powder to the coatings gave excellent durability.