Abstract To make the conductive anticorrosive coating containing low conductive filler content meet the requirements for antistatic applications, and improve the bond strength and anticorrosive ability of the coating, a series of eco-friendly waterborne polyurethane (WPU) graded conductive nanocomposites with low contents of multiwalled carbon nanotubes (MWCNTs) were prepared by two special multilayer coating processes on the basis of the gradient distribution of MWCNTs. Effects of the gradient distribution and the content of the MWCNT on the electrical conductivity, bond strength, and corrosion resistance of the nanocomposites were investigated. The graded conductive nanocomposites prepared by casting the upperlayer coating on the uncured underlayer coating can conduct electricity when the MWCNT content in the underlayer coating was only 0.4 wt%. The coating resistance of the obtained graded conductive nanocomposites exhibiting good properties of adhesion and anticorrosion met the requirements for antistatic. SEM tests showed that the high MWCNT content in the upperlayer coating could penetrate into the underlayer coating, leading to that the MWCNTs formed a gradient distribution of “low content–high content–low content–high content” in the whole coating. As the MWCNT content in the upperlayer coating increased, the dispersion of the MWCNTs in the whole coating became uniform.

中文翻译：

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多壁碳纳米管梯度分布对水性聚氨酯导电纳米复合材料结合强度和耐腐蚀性能的影响

摘要 为使低导电填料含量的导电防腐涂料满足抗静电应用的要求，提高涂层的粘结强度和防腐能力，研制了一系列环保型水性聚氨酯（WPU）级配多壁复合导电纳米复合材料。基于MWCNTs的梯度分布，通过两种特殊的多层涂层工艺制备了碳纳米管（MWCNTs）。研究了梯度分布和多壁碳纳米管含量对纳米复合材料电导率、结合强度和耐腐蚀性的影响。在未固化的下层涂层上浇铸上层涂层制备的梯度导电纳米复合材料，当下层涂层中的MWCNT含量仅为0.4wt%时，可以导电。所得分级导电纳米复合材料的涂层电阻具有良好的附着力和防腐性能，满足抗静电要求。SEM测试表明，上层涂层中高含量的MWCNTs可以渗透到下层涂层中，导致MWCNTs在整个涂层中形成“低含量-高含量-低含量-高含量”的梯度分布。随着上层涂层中多壁碳纳米管含量的增加，多壁碳纳米管在整个涂层中的分散变得均匀。导致MWCNTs在整个涂层中形成“低含量-高含量-低含量-高含量”的梯度分布。随着上层涂层中多壁碳纳米管含量的增加，多壁碳纳米管在整个涂层中的分散变得均匀。导致MWCNTs在整个涂层中形成“低含量-高含量-低含量-高含量”的梯度分布。随着上层涂层中多壁碳纳米管含量的增加，多壁碳纳米管在整个涂层中的分散变得均匀。