加熱水処理したアルミニウム表面のポリエチレンとの接着性について

抄録

When pure aluminum is immersed in hot water, hydrated oxide films are formed. The effect of these films on the adhesion of polyethylene to aluminum surfaces was investigated. The results obtained are as follows:
(1) As the treating temperature rose, the growth rate of the hydrated oxide film increased gradually and the amount of weight gain reached a constant value in shorter immersion time. Also the weight gain of hydrated oxide films varied depending upon the type of treating solutions; smallest in underground water, medium in deionized water and largest in a solution of triethanolamine in deionized water.
(2) The constituent change of hydrated oxide films during the hydration treatment was examined by the OH bending band of reflection infrared spectra. At the initial period of growth of films, the absorption spectrum of OH bending band was observed at nearby 1070cm^-1, but was shifted to nearby 1090cm^-1 as the treatment proceeded, suggesting that the change of the hydration state occurred to hydrated oxide films.
(3) For a high treating temperature and a long treating time, high peeling strength was obtained for the adhesion of polyethylene to the hydrated oxide film on aluminum. When treated in the solution of triethanolamine in deionized water, the peeling strength increased remarkably. But when treated in underground water, its increase was rather small.
(4) In the initial period of hydration, the peeling strength temporarily decreased. This was inferred that at this stage hydrated oxide films showed week cohesion and cohesive failure occurred at these films. This conclusion was justified by the characteristic X-ray images of Al Kα observed for hydrated aluminum oxide films attached to polyethylene surfaces after peeling off.