High solid content preparation of size controllable BiOCl crystals as pearlescent pigment in solvent-free polyurethane coating
High solid content preparation of size controllable BiOCl crystals as pearlescent pigment in solvent-free polyurethane coating
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DOI：
10.1016/j.colsurfa.2022.130129
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发表时间：
2022-12
期刊：
影响因子：
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通讯作者：
Meng Zhang;Pengfei Wang;Mingyuan Wu;Q. Wu;Jianjun Yang;Jiuyi Liu;Jianan Zhang
中科院分区：
文献类型：
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作者：
Meng Zhang;Pengfei Wang;Mingyuan Wu;Q. Wu;Jianjun Yang;Jiuyi Liu;Jianan Zhang
在当前的研究中，我们致力于解决BiOCl晶体制备中的破碎、团聚、尺寸可控性差和高固含量之间不可调和的矛盾。合成了水溶性嵌段聚合物聚乙二醇单甲醚-b-聚甲基丙烯酸二甲氨基乙酯（mPEG-b-PDMAEMA）作为分散剂，通过降低晶体碰撞频率来避免晶体碎片和团聚，从而获得高固含量。在反应温度为80 °C、尿素用量为40 g、铋盐溶液加入速率为0.45 ml/min、反应容器中预加入HCl的量可变的条件下，成功地获得了无碎片的宽尺寸范围的BiOCl晶体，其固含量超过10 wt%。以合成的BiOCl晶体为珠光颜料，以聚甘油四硬脂酸酯和多苯基多亚甲基多异氰酸酯（PAPI）为双组分无溶剂聚氨酯，制备了生物基珠光涂料。该装饰性聚氨酯涂料表现出优异的物理性能和耐腐蚀性，其分别在20、50和70 µm的尺寸变化下表现出从珍珠光泽、闪烁珍珠光泽到闪烁光泽的引人注目的光泽效果。大规模生产高固含量、宽尺寸范围的BiOCl晶体，有望在装饰涂料、化妆品、服装辅料、汽车内饰等领域得到实际应用。
In the current research, we are committed to solving the irreconcilable contradiction between fragmentation, agglomeration, poor size controllability, and high solid content in the preparation of BiOCl crystals. Water soluble block polymer polyethylene glycol monomethyl ether-b-polydimethylaminoethyl methacrylate (mPEG-b-PDMAEMA) was synthesized as dispersant to achieve high solid content by reducing the frequency of crystal collisions to avoid crystal fragments and agglomerates. With the reaction temperature of 80 °C, urea dosage of 40 g, bismuth salt solution addition rate of 0.45 ml/min, and variable amount of pre-added HCl in the reaction vessel, fragment-free BiOCl crystals of wide size ranges were successfully obtained with record-high solid content of above 10 wt%. Furthermore, bio-based pearlescent coatings were prepared by using as-synthesized BiOCl crystals as pearlescent pigments and polyglyceryl tetrastearate and polyphenyl polymethylene polyisocyanate (PAPI) as the formulations of two-component solvent free polyurethane. The decorative polyurethane coatings demonstrated excellent physical properties and corrosion resistance, which exhibited eye-catching gloss effects from pearl luster, glitter pearl luster, to shimmering luster derived from the size variation of 20, 50, and 70 µm, respectively. The large-scaled production of size controllable BiOCl crystals with high solid content in wide size range promises the practical applications in decorative coatings, cosmetics, clothing accessories, and car interior accessories.