材料期刊网

以Mg/Zn/Al-CO3-LDHs(层间复合金属氢氧化物)为前驱体，通过成核/晶化隔离法将2-(2-羟基-4-氨基苯基)-5-磺酸基氢化苯并三唑(HASB)插入到前驱体层间，得到了一种新型的无机-有机复合超分子紫外屏蔽材料──苯并三唑类插层水滑石Mg/Zn/Al-HASB-LDHs。研究了Mg、Zn、Al不同摩尔比对前躯体紫外吸收性能的影响，确定了较佳的配比：n(Mg)/n(Zn)/n(Al)=1∶2∶1。采用 X 射线粉末衍射(XRD)、扫描电镜(SEM)、红外光谱(IR)、热分析(TG-DTA)等手段对Mg/Zn/Al-HASB-LDHs 进行了表征，并将其作为紫外屏蔽材料加入到丙烯酸涂料中，通过紫外-可见光谱研究了Mg/Zn/Al-HASB-LDHs的用量对涂料紫外吸收性能的影响。结果表明，HASB 成功取代了前驱体层间的23CO -离子，并能与主体形成较强的超分子间相互作用，使插层水滑石的热稳定性明显提高。随着Mg/Zn/Al-HASB-LDHs 摩尔分数的增加，丙烯酸涂料的紫外屏蔽作用增强，紫外吸收范围变宽。

A benzotriazole-intercalated layered double hydroxides (LDHs) Mg/Zn/Al-HASB-LDHs, which is a novel supermolecular UV-shielding inorganic-organic composite, was obtained by separate nucleation and aging steps (SNAS) method by intercalating 2-(2-hydroxy-4-aminophenyl)-5-sulfo-2H-benzotriazole (HASB) into Mg/Zn/Al-CO3-LDHs as precursor. The effect of the molar ratio of Mg:Zn:Al on the ultraviolet absorption of the precursor was studied. The optimal molar ratio of Mg:Zn:Al was determined as 1:2:1. The structure and thermal stability of Mg/Zn/Al-HASB-LDHs were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (IR), and thermogravimetry-differential thermal analysis (TG-DTA). The effect of the dosage of Mg/Zn/Al-HASB-LDHs, as an ultraviolet shielding material, on the ultraviolet absorption property of an acrylic coating was studied by UV-visible spectroscopy. The results indicated that HASB successfully replaces the 23CO - ion in the precursor and forms a stronger super-molecular interaction with the matrix, leading to a greatly improved thermal stability of the intercalated hydrotalcite. The increasing of the molar fraction of Mg/Zn/Al-HASB-LDHs enhances the ultraviolet shielding effect and broadens the range of ultraviolet absorption for the acrylic coating.