聚酰胺湿法涂层浆的制备机制及其成膜性能

Preparation mechanism and membrane properties of polyamide wet coating

为了制备性能优异的聚酰胺湿法涂层商标布,通过对聚酰胺凝固膜进行FT-IR、XRD、DSC的表征以及3-D显微镜和SEM分析,研究其制备机制及成膜性能。结果表明:Ca2+破坏了聚酰胺中的氢键,使其在氯化钙/甲醇溶剂中溶解,且当氯化钙与聚酰胺的质量比为2∶1时,聚酰胺与氯化钙的络合性能最好;聚酰胺涂层膜的表面光滑,内层是"蜂窝状"结构,断截面是海绵状不对称的孔型结构,当涂层浆中添加炭黑和染料后,薄膜为黑色,表面分布小孔,光滑度降低。

Abstract For the sake of obtaining superior coating process, the preparation mechanism performance on the trademark fabrics by polyamide wet and membrane properties were studied by infrared spectroscopy （ FT-IR）, X-ray diffraction （ XRD）, differential scanning calorimetry （ DSC）, the 3-D microscope and scanning electron microscopey （SEM）. The results showed that Ca2＋ breaks the hydrogen bonds in the polyamide, so that the solubility of the polyamide in the CaC12/ methanol mixed solvent rapidly increases, and the high solubility shows up as excellent complexing when the mass ratio of polyamide to CaC12 reaches 2： 1. The polyamide membrane has excellent physical characteristics, such as smooth surface, cellular cored structure and spongy asymmetric groove structure in the cross section. When adding carbon black and dye in the coating slurry, the polyamide coating will be black. Meanwhile many holes will be distributed on the membrane surface and the membrane get rougher. This meaningful phenomenon lays foundation for exploring new trademark fabrics by black wet coating process as powerful theoretical basis.