Preparation of intercalated hydrotalcite materials and its effect on thermal stability properties of polyvinyl chloride

In this study, ZnAlLa-maleate-LDHs was synthesized using the co-precipitation-hydrothermal method. The effects of aluminum-lanthanum ratio, co-precipitation time, hydrothermal time, and hydrothermal temperature on the crystal structure were investigated. As indicated by the result, the optimal condi...

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Bibliographic Details
Published in:Progress in rubber, plastics and recycling technology plastics and recycling technology, 2024-11, Vol.40 (4), p.357-377
Main Authors: Du, Guifang, Duan, Jinsheng, Jia, Peijie, Liu, Zhaogang, Feng, Fushan, Hu, Yanhong, Wu, Jinxiu, Zhang, Xiaowei, Li, Jianfei
Format: Article
Language:English
Subjects:
Acids
Aluminum
Caustic soda
Coprecipitation
Crystal structure
Electron microscopes
Heat
Heat stabilizers
Heat treatment
Hydrochloric acid
Hydrothermal crystal growth
Interlayers
Lanthanum
Maleic acid
Mechanical properties
Microscopy
Morphology
Nitrates
Polyvinyl chloride
Reagents
Sodium
Temperature
Thermal stability
Toxicity
Water
Zinc
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Summary:In this study, ZnAlLa-maleate-LDHs was synthesized using the co-precipitation-hydrothermal method. The effects of aluminum-lanthanum ratio, co-precipitation time, hydrothermal time, and hydrothermal temperature on the crystal structure were investigated. As indicated by the result, the optimal condition was n (Al3+): n (La3+) = 10:1, the co-precipitation time reached 24 h, the hydrothermal time was 8 h, and the hydrothermal temperature reached 180°C. The effect of hydrotalcite on the thermal stability properties and plasticizing properties of PVC was analyzed. The result suggested that ZnAlLa-maleate-LDHs enhanced the thermal stability, plasticizing properties, and mechanical properties of PVC compared with ZnAlLa-CO3-LDHs. The layer spacing of hydrotalcite was increased with the introduction of maleic acid, such that the entry of Cl− into the interlayer guest was facilitated, and the decomposition of PVC was inhibited. Moreover, the long-term thermal stability mechanism was analyzed using FTIR before and after hydrochloric acid treatment. As revealed by the above result, the thermal stabilizer ZnAlLa-maleate-LDHs are capable of hindering the breakage of C-Cl bonds in PVC, inhibiting the formation of HCl, and playing a certain role in thermal stabilization.
ISSN:1477-7606
1478-2413
DOI:10.1177/14777606241229205