有机硅改性聚氨酯/环氧树脂胶粘剂的性能研究

Properties of Polyurethane/Epoxy Resin Adhesives Modified by Organosilicon

摘要:

为改善聚氨酯/环氧树脂胶粘剂的耐水性、耐热性及力学性能，以γ-氨丙基三乙氧基硅烷作为有机硅组分对聚氨酯/环氧树脂胶粘剂进行改性，形成有机硅与聚氨酯/环氧树脂的互穿网络结构，最终制成性能优异的有机硅改性聚氨酯/环氧树脂胶粘剂。采用单一变量法，探讨不同含量的有机硅对改性聚氨酯/环氧树脂胶粘剂的性能影响。结果表明，有机硅的加入使得聚氨酯/环氧树脂胶粘剂的接触角增大，吸水率减小，力学强度增加，总体热质量损失率下降，其耐水性、耐热性以及力学性能均有所增强。当有机硅添加量达到10%时，改性胶粘剂的综合性能优异，接触角达83±1.0°，吸水率达0.32%，断裂伸长率达11.25%，拉伸强度达26.99 MPa，冲击强度达34.50 kJ·m^-2，拉伸剪切强度达22.28 MPa。因此，制得的有机硅改性聚氨酯/环氧树脂胶粘剂具有重要的工业应用价值。

Abstract:

In order to improve the water resistance， heat resistance and mechanical properties of polyurethane/epoxy resin （PU/EP） adhesives， γ-Aminopropyl triethoxysilane was used as silicone component to modify PU/EP adhesives to form the interpenetrating network structure of silicone and PU/EP. Finally， organosilicon modified PU/EP adhesives with excellent performance were prepared in this study. The influence of different contents of silicone on the properties of modified PU/EP adhesive was discussed. The results showed that the addition of silicone increased the contact angle of PU/EP adhesive and reduced the water absorption. Besides， the mechanical strength of PU/EP adhesive increased and the overall thermal mass loss rate decreased. At the same time， its water resistance， heat resistance and mechanical properties were enhanced. Further analysis showed that when the addition of silicone reached 10%， the comprehensive properties of the modified adhesive were most excellent， with contact angle of 83±1.0 °， water absorption of 0.32%， elongation at break of 11.25%， tensile strength of 26.99 MPa， impact strength of 34.50 kJ·m^-2 and tensile shear strength of 22.28 MPa. Thus， organosilicon modified PU/EP adhesives prepared in this study have great potentials for industrial applications.