High-quality, low-chloride zinc borate is a low-smoke, non-toxic and environmentally friendly flame retardant with improved electrical properties for printed circuit board (PCB), so it can be used as a new type of flame retardant to replace brominated flame retardants. However, the chlorine content of zinc borate itself is high, and long-term use of zinc borate circuit boards will cause leakage and may cause a fire. To solve this problem, commercially available zinc borate (analytically pure) with a high chlorine content was used for the study. The presence of chloride ions in zinc borate was determined by X-ray photoelectron spectroscopy (XPS) and point of zero charge (PZC) and found to be mainly in the form of soluble salts and electrostatic adsorption. Based on the existing form of chloride ions, the synergistic technology of electrodialysis and washing with NaCO solutions was used to remove most of the chloride ions from zinc borate, and the removal effect was up to 94.03%. The optimal process was optimized by the reaction surface curve method, the separation kinetics and electrical properties were investigated, and the membrane lifetime was evaluated. Zinc borate can be used as a flame retardant in printed circuit boards after contrast treatment. This study provides an important reference and guide for the removal of impurity ions from other inorganic flame retardants. In addition, it provides technical support for the production of high-quality zinc borate flame retardants.

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高品质硼酸锌阻燃剂的制备：硼酸锌中氯离子的存在机理及协同偶联分离

高品质、低氯化物硼酸锌是一种低烟、无毒、环保型阻燃剂，可改善印刷电路板（PCB）的电性能，因此可作为替代溴化物的新型阻燃剂阻燃剂。但硼酸锌本身的氯含量较高，长期使用硼酸锌电路板会导致漏电，并可能引发火灾。为了解决这个问题，研究中使用了市售的高氯含量硼酸锌（分析纯）。通过X射线光电子能谱（XPS）和零电荷点（PZC）测定硼酸锌中氯离子的存在，发现氯离子主要以可溶盐和静电吸附的形式存在。基于氯离子的存在形态，采用电渗析与NaCO溶液洗涤协同技术，去除硼酸锌中的大部分氯离子，去除效果高达94.03%。采用反应面曲线法优化最佳工艺，考察分离动力学和电学性能，并对膜寿命进行评价。硼酸锌经对比处理后可作为印刷电路板的阻燃剂。该研究为其他无机阻燃剂中杂质离子的去除提供了重要的参考和指导。此外，还为高品质硼酸锌阻燃剂的生产提供技术支持。