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目前可用于水下粘接的EP(环氧树脂)胶粘剂用水下固化剂种类不多,主要是一些憎水类改性胺固化剂(如810和301P等)。以不同种类的水下固化剂作为试验对象,着重探讨了水下固化剂的本体黏度、相应水下EP胶粘剂的某些性能(如水下凝胶时间、水下拉伸剪切强度及水下压缩强度等)。研究结果表明:水下EP胶粘剂的适宜凝胶时间为1h左右;水膜隔离胶粘剂/被粘物的界面问题只影响拉伸剪切强度,而不影响压缩剪切强度,故水下固化剂的憎水性良好时,相应EP胶粘剂的压缩强度相对较高,但其钢/钢拉伸剪切强度会受到一定的影响;810和301P具有一定的憎水性,并且相应EP胶粘剂的水下凝胶时间均为1h左右,故不同黏度的810和301P复配可制得综合性能更好的水下EP胶粘剂。
Currently available for underwater bonding EP (epoxy) adhesive with a small variety of underwater curing agent, mainly some hydrophobic modified amine curing agent (such as 810 and 301P, etc.). Taking different types of underwater curing agents as test objects, the bulk viscosity of underwater curing agents, the corresponding properties of underwater EP adhesives (such as underwater gel time, underwater tensile shear strength and underwater compression) Strength, etc.). The results show that the suitable gelling time of underwater EP adhesive is about 1h; the interface problem of water-based insulation adhesive / adherend only affects the tensile shear strength without affecting the compressive shear strength, Good hydrophobicity, the corresponding EP adhesive compressive strength is relatively high, but the steel / steel tensile shear strength will be affected to some extent; 810 and 301P has a certain degree of hydrophobicity, and the corresponding EP adhesive underwater gel time Are about 1h, so the different viscosity of 810 and 301P compound can be prepared better overall performance underwater EP adhesive.