Inorganic Chemicals Industry >
Preparation of modified granular-like CaSO4 and its application in polyvinyl chloride
Received date: 2022-06-13
Online published: 2023-03-17
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.
XU Li , FANG Keneng , BI Yongxiang , YANG Min , CHEN Qianlin . Preparation of modified granular-like CaSO4 and its application in polyvinyl chloride[J]. Inorganic Chemicals Industry, 2023 , 55(3) : 104 -112 . DOI: 10.19964/j.issn.1006-4990.2022-0267
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