Inorganic Chemicals Industry >
In situ modification of superfine magnesium hydroxide with silicon polyether
Received date: 2023-05-18
Online published: 2024-04-18
Ultrafine magnesium hydroxide（MH） was prepared by two-way precipitation method using sodium hydroxide as precipitant and anhydrous magnesium chloride as raw material.In the preparation process，silicon polyether was introduced to organicize the surface of magnesium hydroxide.The effects of the addition method of silicon polyether，the addition amount of silicon polyether，the reaction temperature and the stirring speed on the filtration performance of magnesium hydroxide slurry were investigated.The contact angle，particle size，surface structure and thermal stability of magnesium hydroxide powder were characterized by contact angle tester，nano particle size and Zeta potential analyzer，Fourier transform infrared spectrometer and synchronous thermal analyzer.The results showed that the addition method of silicon polyether was to add silicon polyether in sodium hydroxide solution［Mg（OH）2-Ⅱ］.The addition amount of silicon polyether was 3 g per 100 g MH，the reaction temperature was 60 °C，and the stirring speed was 800 r/min.The filtration performance of magnesium hydroxide slurry was the best，and the fastest filtration speed was 4.79×10-4 m/s.The contact angle results showed that the contact angle of magnesium hydroxide prepared under the optimal conditions was more than 6 times higher than that of unmodified magnesium hydroxide.FT-IR analysis proved that the silicone polyether was successfully adsorbed on the surface of magnesium hydroxide.Thermal analysis showed that the thermal stability of modified magnesium hydroxide was significantly improved.
YANG En , SHEN Hongyan , LIU Youzhi . In situ modification of superfine magnesium hydroxide with silicon polyether[J]. Inorganic Chemicals Industry, 2024 , 56(4) : 42 -49 . DOI: 10.19964/j.issn.1006-4990.2023-0276
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