高品质BiOCl珠光颜料的制备及其在水性珠光印花涂料中的应用

Preparation of high-quality BiOCl pearlescent pigments and their application in waterborne pearlescent printing coatings

摘要:

为突破合成高固含量氯氧化铋 (BiOCl) 晶体时易产生晶体碎片和团聚的瓶颈，本文以聚乙二醇单甲醚-b-聚甲基丙烯酸N,N-二甲基氨基乙酯 (mPEG-b-PDMAEMA) 作分散剂，可控制备了高固含量（高达10 %）、分散性优异的正方形氯氧化铋 (BiOCl) 晶体，以其为珠光颜料，自制的水性聚氨酯 (WPU) 乳液作粘合剂，获得具有不同层次珠光效果的织物珠光印花涂层。分别用光学显微镜、激光粒度仪和 XRD 考察 BiOCl 晶体的形貌、粒径分布和结晶度。并考察珠光印花涂层的透气性、透湿性、水接触角及色牢度等性能。结果表明：BiOCl 晶体的尺寸可控、无碎片和团聚且结晶度高；珠光印花涂层透湿率高于 5500 g/m2?d，透气率在 15～24 mm/s 之间，水接触角高于130 °，耐洗和耐摩擦色牢度达到4级及以上。

Abstract:

In order to breach the bottlenecks of high solid content BiOCl crystals induced crystal fragmentation and agglomeration, square bismuth oxychloride (BiOCl) crystals with high solid content, excellent dispersisty and controllable size were prepared by using polyethylene glycol monomethyl ether-b-polymethyl methacrylate N,N-dimethylaminoethyl ester (mPEG-b-PDMAEMA) as dispersant. Pearlescent printing coatings with different pearlescent effects were obtained by using the as-prepared BiOCl crystals of varied size as pearlescent pigment and self-made waterborne polyurethane (WPU) emulsion as binder. The morphology, size distribution and crystallinity of BiOCl crystals were investigated by optical microscope, particle size distribution analyzer and XRD, respectively. The air permeability, moisture permeability, water contact angle and fastness of the pearlescent printing coatings were tested. The results showed that fragment-free BiOCl crystals of regular square exhibited high crystallinity with solid content of 10 %. The pearlescent printing coating demonstrated air permeability of > 5500 g/m2?d and moisture permeability of 15～25 mm/s-1 with the water contact angle of above 130 ° and color fastness to rubbing and washing reaching 4 or above.