PDF《彩色铝粉 Fe2O3/SiO2/Al 的液相沉积制备与表征》

第?21?卷第 12?期 中国有色金属学报? 2011?年?12?月? Vol.

21?No.12? The Chinese?Journal?of?Nonferrous?Metals? Dec.?2011? 文章编号:1004?0609(2011)12?3169?06? 彩色铝粉?Fe2O3/SiO2/Al?的液相沉积制备与表征 韩凯,张赢超,叶红齐? (中南大学 化学化工学院,长沙? 410083)? 摘要:采用分步液相沉积法在片状铝粉表面包覆 SiO2?与Fe2O3?双层薄膜制备了具有金属光泽的彩色铝粉,以彩 度与光泽度为主要评价指标,探讨 Fe2O3?用量与 pH 值对铝粉包覆效果的影响,利用原子力显微镜(AFM)、扫描电 子显微镜(SEM)和?X?射线衍射(XRD)等手段对包覆前后的铝粉进行表征.结果表明:当?SiO2?包覆量为?20%(质量 分数)时,随着 Fe2O3?膜厚的增加,铝粉颜色由浅黄→金黄→红黄过渡,光泽度下降;

当m(Fe2O3):m(SiO2):m(Al)=? 0.75:0.2:1 时, 铝粉具有良好的彩度与光泽度, 铝粉表面粗糙度由 5.05?nm 增大到 20.6 nm;

反应过程 pH 值对 Fe2O3? 包覆效果有重要影响,pH?值宜控制在?3.9~4.0;

表面活性剂?PVP?的加入有利于提高?Fe2O3?膜层与?SiO2?和?Al?基体 的结合力,从而提高颜色稳定性. 关键词:片状铝粉;

表面包覆;

氧化铁;

彩度;

光泽度 中图分类号:TQ050.4,TQ624? 文献标志码:A? Preparation?and characterization?of?colored aluminum?powder? Fe2O3/SiO2/Al?by liquid?deposition? HAN?Kai,?ZHANG?Ying?chao,?YE?Hong?qi? (School?of?Chemistry?and?Chemical?Engineering,?Central?South?University,?Changsha?410083,?China)? Abstract:? The? colored? aluminum? flake? powder? with? metallic? luster? was? prepared? by? encapsulating? SiO2? and? Fe2O3? double?layer? film? via? step? liquid?phase? deposition? method.? Using? the? chromaticity? and? gloss? as? the? main?targets,?the? influence? of? Fe2O3? amount? and? pH? value? on? the? coating? effect? was? studied.? The? unencapsulated? and? encapsulated? aluminum?powders?were?characterized?by?AFM,?SEM?and?XRD.?The?results?show?that?when?the?amount?of?SiO2?is?20%? (mass? fraction),? with? the? increase? of? Fe2O3? amount,? the? aluminum? powder? changed? colors? from? pale?yellow? to? golden?yellow,? and? then? to? red?yellow,? and? the? gloss? is? reduced.? Under? the? condition? of? m(Fe2O3):m(SiO2):m(Al)=? 0.75:0.2:1,?the?encapsulated?sample?has?good?chromaticity?and?gloss?synchronously,?and?the?surface?roughness? of?the? aluminum?powder?increases?from?5.05?nm?to?20.6?nm.?Furthermore,?pH?value?should?be?controlled?between?3.9?to?4.0.? The?addition?of?PVP?is?helpful?to?improve?the?color?stability?property?of?the?aluminum?powder,?the?Fe2O3? film?is?firmly? combined with?SiO2?and Al.? Key?words:?flake?aluminum?powder? surface?coating? ferric?oxide? chromaticity? gloss? 片状铝粉由于具有特殊的二维鳞片状结构与良好 的金属效应被广泛用于建筑、涂料、印刷印染等工业 领域,是众多金属颜料中发展最快、应用最广的一 类? [1?3]? . 但铝粉颜料色泽单一, 无法满足高档面漆或装 饰性油墨领域的要求,使其进一步发展受到限制? [4]? . 近年来, 多彩铝粉颜料的研制逐渐成为热点? [5?6]? . 多彩 铝粉颜料是一种经过表面改性处理的片状铝粉颜 料,既具有铝粉的金属光泽,又有鲜艳的颜色? [7?8]? .传 统的包覆方法往往对铝粉光滑的表面有一定的破坏作 用,使其金属光泽下降,因此,如何在不大幅降低铝 粉光泽度的同时对其颜色进行改善是多彩铝粉的研究 重点? [9]? .吴垠等? [10]? 在铝粉粒子表面包覆有机聚合物 基金项目:教育部高等学校博士学科点基金(200805330032)? 收稿日期:2010?12?20;