改性粒状硫酸钙制备及其在聚氯乙烯中的应用

doi:10.19964/j.issn.1006-4990.2022-0267

Abstract

Abstract:

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-CaSO₄on 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.

Key words: phosphogypsum, atmospheric acidification method, modified granular-like CaSO₄, polyvinyl chloride, mechanical properties

CLC Number:

X705

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.

Figures/Tables 12

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原料	化学成分质量分数/%
原料	CaO	SO₃	SiO₂	Al₂O₃	Fe₂O₃	P₂O₅
磷石膏	32.05	42.83	3.45	0.32	0.29	1.82

反应温度/ ℃	FWHM/（º）
反应温度/ ℃	（020）	（012）	（202）	（212）
90	0.164	0.176	0.219	0.238
100	0.162	0.173	0.205	0.228
110	0.153	0.158	0.191	0.201

反应时间/h	FWHM/（º）
反应时间/h	（020）	（012）	（202）	（212）
1	0.191	0.217	0.261	0.328
2	0.180	0.209	0.236	0.298
3	0.179	0.202	0.223	0.271
4	0.162	0.173	0.205	0.228
5	0.179	0.194	0.216	0.255

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Preparation of modified granular-like CaSO4 and its application in polyvinyl chloride

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