环氧胶粘剂最佳配方设计3

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    怎样设计出环氧胶粘剂的最佳配方？要设计出环氧胶粘剂的最佳配方，达到所要求的胶接性能，就必须了解环氧胶粘剂的粘附机理和胶接的破坏机理。我国在这方面已做了大量研究，并提出了许多理论，虽然都还存在一些不足之处，但是已阐明和解决了不少实际问题，大大推动了环氧胶粘剂的开发应用。环氧树脂胶粘剂配方设计的基本原则，首先要把握好以下三个方面：一是胶粘剂阶性质与胶接性能的关系；二是所需环氧胶粘剂关键性能的主要依据；三是环氧胶粘剂配方设计的步骤和方法。怎样设计出环氧胶粘剂的最佳配方？要设计出环氧胶粘剂的最佳配方，就必须了解环氧胶粘剂的粘附机理和胶接的破坏机理。这阐明和解决了不少实际问题，推动了环氧胶粘剂的开发应用。

    三、环氧胶粘剂配方设计的步骤和方法
    首先应根据使用性能和允许的固化工艺条件，判断采用环氧胶粘剂是否有可能，在性能价格比上是否有优势。然后大体上按照以下步骤进行配方设计。
    (1)初步判断所需环氧胶粘剂的主要性能是哪些，次要性能是哪些。
    (2)本着确保主要功能，兼顾其他功能的原则，按照组分材料的结构和性能与胶粘剂性能的关系来确定胶粘剂的初步配方(胶粘剂的组配和配比)。还应考虑成本及组分材料的来源。主要包括：①先选配环氧树脂固化体系。按化学当量计算树脂和固化剂的理论用量。对催化剂和促进剂用量则参考经验数据。②再选配其他助剂。参照经验数据或试配法选定初步用量(配比)。组分材料的在选配时还应注意组分材料之间的相互影响。
    (3)按照主功能最优，其他功能适当的原则对初步配方进行优化。如采用正交回归分析法等，并借助计算机辅助设计，经过综合权衡最后定出最佳配方。必须指出按标难方法测出的胶接强度，并不是实际接头的强度。这是因为胶接强度不仅与胶粘剂和被粘物阶性质有关，而且还受接头的形式和几何尺寸、胶接工艺条件、环境温度和湿度、加载方式，和速度等因素的影响。实际接头和标准试样在这些方面并不完全相同。所以对实际结构件还要进行模拟件的强度测试，必要时还必须对实际胶接件直接进行破坏性强度测试。