思索固化剂的种类与性能:固化剂的种类对固化物的力学性能、耐热性、耐水性、耐腐蚀性等都有很大影响,例如芳香多胺、咪唑、酸酐等固化剂固化环氧树脂的耐热性高于脂肪族多胺、低分子聚酰胺固化剂;芳香族酸酐固化环氧树脂的耐水性优于芳香二胺和脂肪族多胺固化剂;三亚乙基四胺固化剂耐碱性好,但耐酸性和耐甲醛溶液性较差。脂环族多胺(如异佛尔酮二胺)固化环氧树脂的耐药品性优秀。酸酐固化剂固化环氧树脂的耐碱性优于耐酸性。应依据不同的用处和性能请求选择恰当的固化剂。
Compound application of several curing agents: Several curing agents can achieve complementary effects. For example, low molecular weight polyamide curing agent combined with a small amount of m-phenylenediamine curing agent can not only cure at room temperature, but also increase the toughness of cured products while properly improving heat resistance. When TMA and methyl tetrahydrophthalic anhydride are combined, the eutectic mixture has low viscosity (25 C, 200-250 mPa. s). It is easy to mix with epoxy resin and improves the technological properties. The curing agent for injection is environmentally friendly. The selected curing agent should be harmless to human body and no pollution to the environment. Ethylenediamine can never be used as a curing agent alone. Modified amine curing agent should be used as far as possible.
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