Ultramarine is a nontoxic and cheap inorganic pigment, which has been rarely used in blue pearlescent pigments. This work reports the synthesis of nano-ultramarine with LTA structure by calcining the polysulfide impregnated zeolite at 600^∘C for 1h. Then the ultramarine colored mica composite was prepared by using γ-(2,3-epoxypropoxy) propytrimethoxysilane (KH-560) to attach ultramarine to the mica substrate through a covalent bond. Scanning electron microscope with energy dispersive spectrometer (SEM-EDS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and Ultraviolet and Visible Spectrophotometry (UV-Vis) were employed to characterize the structure and properties of the ultramarine, composites as well as the intermediates. The results showed that LTA framework was retained in ultramarine during the calcination at the temperature below 700^∘C. The FTIR spectra demonstrated that ultramarine was successfully modified by KH-560. The SEM, UV-Vis and L*a*b* values revealed the increasing the amount of KH-560-modified ultramarine contributing to the formation of the dense coating layer on mica and changed the color of the ultramarine-coated mica composite. The optimum mass ratio of mica to ultramarine was 1:2 and the composite demonstrated an ideal blue pearlescent effect.

中文翻译：

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云母基材包覆LTA型群青蓝色珠光颜料的制备及特性

群青是一种无毒廉价的无机颜料，在蓝色珠光颜料中已很少使用。^{本工作报道了通过在 600 ∘} C下煅烧多硫化物浸渍沸石 1 来合成具有 LTA 结构的纳米群青。H。进而制备了群青色云母复合材料。γ-(2,3-epoxypropoxy) propytrimethoxysilane (KH-560) 通过共价键将群青附着在云母基材上。采用扫描电子显微镜结合能量色散光谱仪（SEM-EDS）、X射线衍射仪（XRD）、傅里叶变换红外光谱仪（FTIR）和紫外可见分光光度法（UV-Vis）对群青的结构和性能进行表征，复合材料以及中间体。结果表明，在700℃以下的煅烧过程中，LTA骨架保留在群青中^。FTIR光谱表明，群青被KH-560成功改性。SEM、UV-Vis 和大号*一种*b* 值表明 KH-560 改性群青的量增加有助于在云母上形成致密的涂层，并改变了群青包覆的云母复合材料的颜色。云母与群青的最佳质量比为1:2，复合材料表现出理想的蓝色珠光效果。