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INORGANIC PARTICLE COATING WITH POLY(DIMETHYLSILOXANE)

机译:聚(二甲基硅氧烷)的无机颗粒涂层

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摘要

Stable, thick poly(dimethylsiloxane) (PDMS) coatings are formed on iron(III) and aluminum oxide and calcium carbonate particles by impregnating the particles with dimethylsilicone oil and heating at 250-280 degrees C. These coatings are strongly resistant to solvent extraction and to exposure in a water-saturated atmosphere. Coated particles are strongly hydrophobic, as evidenced by their greater stability in apolar solvents. Silicone coating formation on oxide particles is interpreted as a result of two reactions: siloxane chain opening at higher temperatures, followed by the reaction of active chain end-groups with hydroxo groups at the metal oxide or carbonate surfaces and silicone cross-linking by methylene or siloxane bridges. The procedures described in this paper differ from usual silanization or siliconization procedures because it uses stable PDMS and yields thicker coatings. (C) 1996 John Wiley & Sons, Inc. [References: 28]
机译:通过用二甲基硅油浸渍颗粒并在250-280℃下加热,在铁(III),氧化铝和碳酸钙颗粒上形成稳定,厚实的聚(二甲基硅氧烷)(PDMS)涂层。这些涂层具有很强的耐溶剂萃取和暴露在水饱和的气氛中。涂层颗粒具有很强的疏水性,这在非极性溶剂中具有更高的稳定性。氧化物颗粒上形成有机硅涂层的解释是以下两个反应的结果:在较高温度下硅氧烷链开环,然后是活性链端基与金属氧化物或碳酸盐表面上的羟基的反应,以及有机硅通过亚甲基或亚乙基交联。硅氧烷桥。本文描述的过程与常规的硅烷化或硅化过程不同,因为它使用稳定的PDMS并产生较厚的涂层。 (C)1996 John Wiley&Sons,Inc. [参考:28]

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