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利用异氰酸酯与多元醇在不同的反应条件下制取三种性能不同的聚氨酯(PU)预聚体(PUⅠ、PUⅡ和PUⅢ),然后分别与还原纳米石墨(RNG)、三羟甲基丙烷(TMP)混合制备三种RNG/PU导电胶(RNG/PUⅠ、RNG/PUⅡ和RNG/PUⅢ)。运用多种检测手段对导电胶的导电性能、力学性能和热稳定性能进行了分析。结果表明:随着RNG质量分数的增加,三种导电胶的导电性能均增强,其导电逾渗阀值分别为10.0%、16.7%和20.0%;导电胶的拉伸剪切强度随RNG质量分数的增加呈先升后降的趋势,当w(RNG)=20%时导电胶的拉伸剪切强度为1.37～4.40MPa;RNG的加入使导电胶的热稳定性能明显提高。
Three kinds of PU prepolymers (PU Ⅰ, PU Ⅱ and PU Ⅲ) with different properties were prepared under different reaction conditions by using isocyanates and polyols. Then, three different polyurethanes (PUIs, PUⅡ and PUⅢ) ) To prepare three types of RNG / PU conductive pastes (RNG / PUI, RNG / PUII and RNG / PUIII). The conductivity, mechanical properties and thermal stability of the conductive adhesive were analyzed by a variety of testing methods. The results show that with the increase of RNG mass fraction, the conductivity of the three conductive pastes increases with the conductive percolation threshold of 10.0%, 16.7% and 20.0%, respectively. The tensile shear strength of the conductive pastes increases with the mass fraction of RNG The tensile shear strength of conductive adhesive is 1.37 ~ 4.40MPa when w (RNG) = 20%. The addition of RNG makes the thermal stability of conductive adhesive increase obviously.