改性粒状硫酸钙制备及其在聚氯乙烯中的应用
收稿日期: 2022-06-13
网络出版日期: 2023-03-17
基金资助
国家重点研发计划项目(2018YFC1903500);贵州省重大科技专项(黔科合平台人才[2019]5410);贵州省重大科技专项([2016]3021);贵州省科技厅科技支撑计划项目(黔科合成果[2021]103)
Preparation of modified granular-like CaSO4 and its application in polyvinyl chloride
Received date: 2022-06-13
Online published: 2023-03-17
使用常压酸化法以磷石膏为原料制备粒状硫酸钙（G-CaSO4），利用X射线衍射（XRD）、扫描电镜（SEM）探究了反应温度和反应时间对粒状硫酸钙物相和形貌的影响，对最佳条件下制备的粒状硫酸钙进行了红外光谱（FT-IR）、透射电镜（TEM、HR-TEM）分析。然后，使用硬脂酸对粒状硫酸钙进行改性得到改性粒状硫酸钙（MG-CaSO4），将改性粒状硫酸钙作为填料应用于聚氯乙烯（PVC）中，研究了改性粒状硫酸钙对聚氯乙烯复合材料微观形貌和力学性能的影响。结果表明:粒状硫酸钙最佳制备条件为反应温度为100 ℃、反应时间为4 h，在此条件下成功制备得到平均粒径为0.27 μm的粒状硫酸钙；使用5%（质量分数）的硬脂酸改性粒状硫酸钙，得到改性粒状硫酸钙；将改性粒状硫酸钙作为填料应用到聚氯乙烯中，当其添加量为2%（质量分数）时，聚氯乙烯复合材料的拉伸强度、断裂伸长率和弯曲强度分别提高了11.39%、41.73%和14.02%。研究结果可为磷石膏的高值化利用提供参考。
徐丽 , 房可能 , 毕永香 , 杨敏 , 陈前林 . 改性粒状硫酸钙制备及其在聚氯乙烯中的应用[J]. 无机盐工业, 2023 , 55(3) : 104 -112 . DOI: 10.19964/j.issn.1006-4990.2022-0267
Granular-like CaSO4（G-CaSO4） was prepared from phosphogypsum by atmospheric acidification.The effect of the reaction temperature and time on the phase and morphology of G-CaSO4 were investigated by X-ray diffraction（XRD） and scanning electron microscopy（SEM）.Fourier transform infrared spectroscopy（FT-IR） and transmission electron microscopy（TEM，HR-TEM） analyses were performed on G-CaSO4 of optimal conditions.Then，G-CaSO4 was modified with stearic acid to obtain modified granular-like CaSO4 （MG-CaSO4），which was used as filler in PVC.The effect of MG-CaSO4 on the micromorphology and mechanical properties of PVC composites were also studied.The results showed that the optimal conditions for the preparation of MG-CaSO4 were as follows:the reaction temperature was 100 ℃ and the reaction time was 4 h.Under these conditions，G-CaSO4 with an average particle size of 0.27 μm was successfully prepared，and then modified with 5%（mass fraction） stearic acid to MG-CaSO4.MG-CaSO4 was applied to PVC as filler，when the addition amount was 2%，the tensile strength，elongation at break and flexural strength of PVC composites were increased by 11.39%，41.73% and 14.02%，respectively.The research results ccould provide reference for the high-value utilization of phosphogypsum.
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