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涂料、油墨中为什么添加分散剂?

作者:admin 发布日期: 2019-05-14 二维码分享

       TULIAO、YOUMOZHONGWEISHENMETIANJIAFENSANJI?

FENSANJIDEZUOYONGSHIZUZHILIZIZAIJIEZHIZHONGTUANJU,BUSHIZUZHILIZICHENJIANG。

在液相中,粒子是否沉降与粒子粒径有很大关系。粒径小于1微米的粒子,布朗运动显著,单位时间内10纳米的粒子布朗运动的距离是十微米级,比重力引起的下降距离大得多;粒径大于5微米的粒子,布朗运动不显著可忽略。也就是说,在水或溶剂中,粒子是否沉降的决定因素是粒子的粒径,粒径小于1微米的粒子不沉降;粒径大于5微米的粒子必然沉降,形成沉淀。


    颜料聚集体的尺寸通常在200纳米左右,高色素碳黑的原生粒径12纳米、酞菁蓝粒径大约200纳米。在液相中,高色素碳黑、酞菁蓝理论上是能形成稳定悬浮液的,足够强的剪切力将附聚体打开成聚集体,分散剂吸附在聚集体表面,如果分散剂和粒子结合力足够大、稳定作用足够强,则粒子不形成尺寸大的微米级团聚体、絮凝体,粒子也就不沉降;液相中碳黑、酞菁蓝粒子沉淀,是因为团聚体的尺寸大。填料的粒径通常大于5微米,在分散、储存时必然沉降,分散时,吸附在填料粒子表面的分散剂阻止粒子团聚形成大的絮凝体,从而减缓沉降速度;配方中加入的增稠剂、触变剂提高了体系的粘度,也能减缓沉降速度。


在色漆生产中,.重要的步骤之一是颜料粒子在液相分散介质中的均匀稳定分布。颜料粒子聚集体以完全解絮凝状态分散在液相基料中,是颜料充分展示性能(遮盖力、着色力、透明度)的必要条件。假使颜料研磨分散不是.佳,那么就会发生许多缺陷,比如颜料粒子絮凝、沉淀、漆膜光泽降低、颜色色相偏移液相分散介质包括水、有机溶剂、水/醇醚、树脂溶液。

ZAISEQICHUCUNSHI,FENSANZAIYEXIANGJIEZHIZHONGYANLIAOLIZIBUNENGXUNING、CHENDIAN;TUZHUANGSHIGONG(SHUATU、PENTU)SHI,YANLIAOLIZIBUNENGYINWEIGAOJIANQIESHIQUWENDINGXING。

TUZHUANGSHIGONGHOU,SHIMOZHONGSHUI、RONGJIHUIFAXINGCHENGGANMO,ZHIYOUYANLIAOLIZIYIDANGEJUJITIZHUANGTAIJUNYUNFENBUZAIGANMOJUHEWUJITIZHONG,YANLIAOXINGNENGCAINENGCHONGFENZHANXIAN。JISHIYANLIAOLIZIZAIYEXIANGJILIAOZHONGSHIJIEXUNINGDEJUJITIZHUANGTAI,YEBUNENGQUEBAOZAIGANMOJUHEWUZHONGLIZIBUFASHENGTUANJU。YANLIAOLIZIZAIYEXIANGZHONGFENSANDEHAOBUDENGYUZAIGANMOJUHEWUZHONGFENSANDEHAO,YINWEILIZIDEFENSANJIEZHIFASHENGLEBIANHUA。RONGJIXINGTULIAOYOUMOZHONG,YANLIAOYANMOSHISEJIANGPEIFANGZHONGTONGCHANGHANYOUCHENGMOSHUZHI,YANMOHOUXIFULEFENSANJIDELIZIFENSANZAIRONGJIZHONG、SHUZHIRONGJIEZAIRONGJIZHONG,YANLIAOLIZI、FENSANJI、SHUZHIJUHEWU、RONGJIXIANGHUZUOYONGXINGCHENGWENDINGPINGHENGTIXI;DIAOQISHI,RUGUOSHUZHIZHONGDEZUFENBUYINQIFENSANJIZHUANGTAIDEBIANHUA,NEIMEZHIBEIDEQISHIWENDINGDE;CHENGMOSHI,FENSANJIDEWENDINGNENGLIDUILIZISHIFOUTUANJUDEYINGXIANGGENGXIANZHU,WENDINGDUANHESHUZHIXIANGRONGHAO、WENDINGDUANCHICUNDA,LIZIYUEBUTUANJU。SHUIXINGTULIAOYOUMOZHONGZUFENJIANDEXIANGHUZUOYONGGENGFUZA,SHUIZHONG,FENSANJI、BIAOMIANHUOXINGJI、ZENGCHOUJI、CHUNMIRONGJIZAIYANLIAOLIZIBIAOMIANJINGZHENGXIFU,RUGUOFENSANJIHELIZIJIEHELIBUGOUDA,CHUNMIRONGJIFENZI、ZENGCHOUJIHUITIDAIFENSANJI,ZHISHILIZIBUWENDING;PENTUSHI,RUGUOFENSANJIHELIZIJIEHELIBUGOUDA,FENSANJIHUICONGLIZIBIAOMIANTUOLUO,LIZIJIANFASHENGXUNING;CHENGMOSHI,SHUIFENHUIFA,BULUNSHILIZIXINGFENSANJIHAISHIFEILIZIXINGFENSANJI,FENSANJIDUILIZIWENDINGZUOYONGDOUJIANRUO,LIZITUANJUQUSHIDA。

       WEIMIJIDELIZI,BIBIAOMIANJIXIAO,ZAIYEXIANGJIMOXINGCHENGGUOCHENGZHONG,TONGCHANGBUTUANJU。