樹脂フィルムの剥離試験による接着界面の耐水性評価

Evaluation of water durability at adhesion interfaces by peeling test of resin film.

抄録

金属表面に4-META樹脂を接着した樹脂薄膜に液体窒素で熱応力を与えた後，剥離面積を測定することにより，接着界面の耐水性を検討した．接着界面の熱応力はコンピュータ支援有限要素法により計算した．4-META樹脂と強く接着する18-8ステンレス鋼試験片では，乾燥状態で樹脂が0.55 mmより厚い試験片で全界面破壊が生じた．水による接着界面の劣化を調べるために0.25mmの樹脂層を選んだ。せん断応力は0.25mm厚の樹脂層で16MPaと計算された。水分子によって急速に劣化する4-META樹脂を用いた軟鋼の接着界面について、接着界面に浸透した水分量とともに、水浸漬時間と接着界面の劣化との関係を検討した。本研究で提案した方法は、接着界面の耐水性を短時間で評価する方法として有効である。

The water durability at adhesion interfaces was investigated by measurement of the peeled area of thin resin films bonded with 4-META resin on metal surfaces after imposing thermal stress using liquid nitrogen. Thermal stress at the adhesion interface was calculated by a computer-aided finite element method. On 18-8 stainless-steel specimens which bond strongly with 4-META resin, total interface failure occurs on specimens with resin thicker than 0.55 mm in dry condition. A resin layer of 0.25 mm was chosen to study degradation of the adhesion interface by water. The shearing stress was calculated as 16 MPa for a 0.25 mm thick resin layer. On mild-steel adherent interface with 4-META resin which degrades rapidly by water molecule, the relationship between water immersion time and degradation at the adhesion interface was discussed together with the amount of water penetrated at the interface. The method proposed in the present study is effective as a quick evaluation method for water durability at the adhesion interface.