Abstract A thin layer of un-cured resin over metal substrates applied by using an acetone-diluted resin solution (without hardener) has been found to be beneficial to strong adhesive bonding. The resin pre-coating (RPC) solution can effectively seal sub-surface micro-cavities and increase the substrate wettability. This study examines possible aftermath effects of the acetone dilution on mechanical properties of epoxy through comparison of samples made from as-received resin and resins diluted once and twice by acetone. RPC can be accepted with confidence in substrate pre-treatments for strong adhesive bonding if no detrimental effect on epoxy properties is observed. Fourier transform infrared spectrum (FTIR) was conducted, showing the spectrogram of the resin previously diluted by acetone was the same as that of as-received resin, i.e. no change in epoxy molecular structures after complete evaporation of acetone. Strength and modulus of elasticity measured by flexural and compressive tests were compared using samples made from as-received resin, and resins diluted once and twice by acetone. Variations among results from the three groups were less than 2%, or negligible, affirming the RPC method can be used for substrate pre-treatments and stronger adhesive bonding.

中文翻译：

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丙酮对粘接前表面处理环氧树脂力学性能的影响

摘要 使用丙酮稀释的树脂溶液（不含固化剂）在金属基材上涂上一层薄薄的未固化树脂已被发现有利于强粘合剂粘合。树脂预涂（RPC）溶液可有效密封次表面微腔，增加基材润湿性。本研究通过比较由原样树脂制成的样品和用丙酮稀释一次和两次的树脂制成的样品，检查了丙酮稀释对环氧树脂机械性能可能产生的后果影响。如果没有观察到对环氧树脂性能的不利影响，则可以放心地接受 RPC 进行基材预处理以实现强粘合剂粘合。进行傅里叶变换红外光谱（FTIR），显示预先用丙酮稀释的树脂的光谱与收到的树脂相同，即 丙酮完全蒸发后环氧分子结构没有变化。使用由原样树脂制成的样品和用丙酮稀释一次和两次的树脂，比较了通过弯曲和压缩测试测量的强度和弹性模量。三组结果之间的差异小于 2%，或可以忽略不计，肯定 RPC 方法可用于基材预处理和更强的粘合剂粘合。