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以层状镁铝双金属氢氧化物(MgAlLayeredDoubleHydroxides,Mg-AlLDHs)为主体,以有机紫外光稳定剂2-羟基-4-甲氧基二苯甲酮-5-磺酸(BP)为客体,结合焙烧复原法和阴离子交换法合成了具有超分子结构有机-无机插层复合物(MgAl-BPLDHs),研究了层间阴离子、反应介质、pH值、反应时间等因素对于插层材料超分子结构的影响。用FTIR、XRD、TG-DTA、UV-Vis和粒度分析对其不同尺度的结构、热稳定性和紫外光稳定性等进行表征。结果表明,采用阴离子交换法难以进行插层反应;通过焙烧复原法可显著降低MgAl-LDHs层间CO2-离子,从而有利于BP阴离子交换进入MgAl-LDHs层间,在去离子水中,水温100℃,pH=7,反应时间为48h,BP过饱和的条件下合成得到最高插层率的MgAl-BP-LDHs;主体水滑石层板与客体以静电力和氢键相互作用,得到的超分子结构材料具有良好的热稳定及兼具优异的紫外屏蔽、吸收性能,是一种新型的有机-无机复合光热稳定剂。
With MgAlLayered Double Hydroxides (Mg-AlLDHs) as the main body and organic UV light stabilizer 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid (BP) The superlattice structure organic-inorganic intercalation complexes (MgAl-BPLDHs) were synthesized by calcination and anion exchange method. The effects of interlaminar anion, reaction medium, pH and reaction time on the supramolecular structure Impact. The structure, thermal stability and UV stability of the samples were characterized by FTIR, XRD, TG-DTA, UV-Vis and particle size analysis. The results showed that it was difficult to carry out the intercalation reaction by anion exchange method. The calcination-reduction method could significantly reduce the inter-layer CO2-ions of MgAl-LDHs, which facilitated the exchange of BP anions into MgAl-LDHs layers. The deionized water had a water temperature of 100 ℃ , pH = 7, the reaction time was 48h, BP supersaturated conditions were synthesized under the highest intercalation rate of MgAl-BP-LDHs; host hydrotalcite laminate and guest electrostatic and hydrogen bonding interactions, the resulting supramolecular structure The material has good thermal stability and excellent UV shielding and absorption properties, and is a novel organic-inorganic composite light and heat stabilizer.