颜料的分散Pigment_Dispersion

Dispersibility Testing, cont’d. 分散性能测试 (续)
Press pigment pellet, measure break strength
压成颜料薄饼,抗裂强度的测量
Disperse in paint, measure low angle gloss of applied coating 分散于涂料中，测量涂层光泽度(小 (
Organic Addition Method 有机助剂的添加方法
Insure accurate control of amount on pigment 精确控制颜料 中的添加量 Distribute well on pigment surface 助剂均匀分布在颜料表面
Organic Additive Criteria 有机包膜助剂标准
Treat only well-dispersed slurry 只处理分散良好的 料浆 Complete surface coverage 表面的完全覆盖 Proper choice of dispersion aids选择合适的分散助 剂
Factors Affecting Dispersion 影响分散的因素
Pigment Dispersion 颜料的分散
Dr. John Brand 上海钰通化工科技有限责任公司
Pigment Dispersibility颜料的分 散性
Subject of most customer complaints, frequently in error与大多数客户抱怨相关的、 常搞错的课题 Property most tested主要测试的性能 More tests for dispersion than any other property大多数的测试是为分散性而做 Most pigment producers are not happy with their tests!大部分厂家对现有的分析手段不满 意
BWG8215 and TME
Either provides excellent dispersibility in all media 两者均可提供在所有介质中的优质分散性
能
Superior results occur when they are used together, since BWG8215 protects against dispersibility loss while aging in warehouse and during shipment. 两者一
Proper Handling after Surface Treatment 确措施 表面处理后的正
Repulp and washing 重新制浆和水洗 Dry completely before final milling最后的细磨前将物料完全干燥 Correct addition of organic additives添加合适的有机助剂 Separate pigment and steam before dew point蒸汽凝结前分离 颜料和蒸汽
角度)
Disperse in paint, measure量色彩度
Measure oil absorption of dry pigment 检测
干颜料的吸油量
Why is Dispersion so Important? 为什么分散性如此重要？
Poor Dispersion affects:受不良分散影响的方面:
BWG Dispersant BWG8215分 散剂
Proprietary mixture in water at pH 7 to 8 专有的水溶混合物PH值7- 8 Can be added to pigment accurately 能 精确地控制加入量
To spray dryer feed slurry, or 在喷雾干燥 机进料浆时加入，或 To tunnel dryer discharge as a spray 在管 道 干燥机出料时喷入
起使用时效果最佳,因为BWG8215能使分散性能在长期 的仓储和运输中保持良好状态.
Summary 总结
Superior dispersibility depends on: 好的分 散性依赖于: Proper production equipment and process 合适的生产设备和工艺过程 Proper lab equipment and testing methods合适的实验室设备和检测方法 Proper additives合适的添加剂
Choice of Organic Additives 有机助剂的选择
Provide easy wetting in broad paints/plastics 在广泛应用的 涂料/塑料中可提供易润湿性 Protect pigment from flocculating during use 在颜料使用中 具有防絮凝性 No yellowing during normal processing在一般工艺处理时有 免黄变性 Protect pigment from aging in warehouse 防止颜料储存时老 化
What is Poor Dispersibility? 什么是不良分散性?
Particles of pigment in the final paint or plastic 存在 于最终涂料或塑料中的颜料颗粒 Particle sources 颗粒来源
Large particles not removed during processing 在生产中残余的大颗粒 Poor surface treatment causes clumps of unwet pigment 不良表面处理造成未润湿的颜料聚块 Large particles formed in bagged pigment by moisture adsorption and drying装袋后的颜料由于对湿气的吸附和 干燥形成的大颗粒
Cost of paint and plastics production 增加涂料、塑 料的生产成本
Slow-downs 减缓工作速度 Re-working 返工
All pigment properties:所有颜料的性能
Opacity不透明性 Tinting strength着色力 Gloss光泽度 Tint and Mass Tone 色调和底色
Factors Affecting Dispersion 影响分散的因素
Particle Size Distribution粒径分布
Minimal aggregates or agglomerates将聚集和团聚 降到最低 Minimal fines将过细的颗粒降到最低
Pigment Surface Treatment 表面处理
Good wetting and dispersion in most coating systems, both water and solvent based 使颜料在大多数涂料 体系,包括水性和油性涂料中有良好的润湿和分散 Stays with the pigment after dispersion 颜料分散后助 剂能继续附着/吸附在颜料粒子上 / Works for both paint and plastics同时适用于涂料和塑 料 Non-toxic to humans and animals对人和动物无毒性 Minimal effect on pigment volatile content 减小对颜 料的挥发成分的影响
Pigment Dispersant Types 分散剂类型
Hydroxy functional含羟基型
Glycols乙二醇 Polyols多元醇
Alkanolamines链烷醇胺 Carboxylic acids羧酸 Silanes and siloxanes硅烷和硅氧烷 Proprietary blends专用型混合物
TRIMET
Trimethylolethane is a polyol 三羟甲基乙烷是一种多 元醇 Provides excellent wetting and dispersion in all media 使颜料能在所有介质中具良好的润湿性和分散性 Can add to pigment as either solid or solution in water 可以以固态或液态形式加入 Distributes easily on pigment.容易均匀分布在颜料粒 子表面 Approved as direct food additive on pigment in USA
Win by Quality! 以质量取胜!
Superior Dispersibility 优异的分散性: Allows the producer to sell his product based on superior performance, not on price.使厂家 price. 在销售产品时以卓越的颜料性能而非价格取胜. Competition on price defeats market progress and profitability for all producers靠价格来竞 争会导致市场混乱,使所有厂家的收益都降低
Recommendations 建议
Two dispersants are recommended for general use 建议一般采用下面两种分散剂
BWG8215 TRIMET or TME
BWG8215 Dispersant BWG8215分散剂
Based on US Patent , expired 基于美国专利 Bonds to –OH groups on pigment surface通过羟基基 团吸附在颜料表面 Gives excellent dispersion in water- and solventbased media颜料能在水性/油性基料中良好分散 Protects against loss of dispersibility in warehouse by hindering water adsorption from air.防止颜料在储存 时从空气中吸潮,从而保持颜料分散性 Easy to distribute on pigment surface容易分布并吸附 到颜料表面
Dispersibility Testing 分散性能 测试
Disperse in paint and measure Hegman分散于涂料中, 测量Hegman细度 Disperse in paint, filter and count particles分散于涂料 中,过滤及颗粒计数 Disperse in paint, dilute, measure particle size分散于 涂料中, 稀释，颗粒大小测量 Disperse in plastic, weigh screen residue after injection molding分散于塑料中, 在注入模子后筛余物 的称量 Disperse in plastic, measure break strength分散于塑 料中，抗裂强度的测量
Proper Packaging and Storage妥善的包装和储存
Use bags with inner plastic wall 使用有塑料内膜的包装袋 Allow moisture to escape during cooling 冷却时让湿气充分散逸
Factors Affecting Dispersion 影响分散的因素