(1. 中南大學(xué) 化學(xué)化工學(xué)院，長沙 410083;
2. 湖南環(huán)境生物職業(yè)技術(shù)學(xué)院，衡陽 421005)
摘 要: 采用共沉淀法制備鎂鋁水滑石和鋅鋁水滑石，采用XRD、FT-IR對其進行表征，同時將其按不同比例進行復(fù)配應(yīng)用到聚氯乙烯(PVC)中。利用靜態(tài)熱老化法研究復(fù)合水滑石穩(wěn)定劑在聚氯乙烯中的熱穩(wěn)定性能。結(jié)果表明：合成的鎂鋁水滑石和鋅鋁水滑石結(jié)晶度高，結(jié)構(gòu)規(guī)整；鎂鋁水滑石和鋅鋁水滑石復(fù)配物的熱穩(wěn)定性能優(yōu)于單一鎂鋁水滑石、鋅鋁水滑石，其最佳復(fù)配摩爾比為x(MgAl-CO3-LDH)׃x(ZnAl-CO3-LDH)=1׃0.7。當該復(fù)配物與同樣金屬含量的ZnMgAl-CO3-LDH(x(Zn)׃x(Mg)׃x(Al)=0.7׃1׃1.7)相比時，前者熱穩(wěn)定性能更好。另外，制備該復(fù)配物的工藝較制備ZnMgAl-CO3-LDH的工藝更簡單。
關(guān)鍵字: 復(fù)合水滑石；熱穩(wěn)定劑；PVC
on thermal stability of PVC
（1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2. Hunan Environment-Biological Polytechnic, Hengyang 421005, China）
Abstract:MgAl-CO3-LDH and ZnAl-CO3-LDH were prepared by co-precipitation method. The synthesized materials were analyzed and characterized by XRD and FT-IR. Then the PVC composites containing MgAl-CO3-LDH and ZnAl-CO3-LDH were prepared with different ratios. The effects of MgAl-CO3-LDH/ZnAl-CO3-LDH composites on the thermal stability of PVC were investigated by static thermal aging test. The results show that MgAl-CO3-LDH and ZnAl-CO3-LDH have high crystallization degree and uniform structure. Compared with single LDH such as MgAl-CO3-LDH, ZnAl-CO3-LDH or ZnMgAl-CO3-LDH, the MgAl-CO3-LDH/ZnAl-CO3-LDH composites have a better long-term stability, and the best adding molar ratio of MgAl-CO3-LDH/ZnAl-CO3-LDH in the composites is 1׃0.7 at which the composites of MgAl-CO3-LDH and ZnAl-CO3-LDH have better thermal stability than ZnMgAl-CO3-LDH(x(Zn)׃x(Mg)׃x(Al)=0.7׃1׃1.7). Furthermore, the preparation process of MgAl-CO3-LDH/ZnAl-CO3- LDH composites is not so difficult as that of ZnMgAl-CO3-LDH.
Key words: MgAl-CO3-LDH/ZnAl-CO3-LDH composites; thermal stabilitizer; polyvinyl chloride(PVC)
