Overview of Bayer Waterborne Technology - PUD/2K H2O 水性聚氨酯体系Waterborne PU Systems 聚氨酯分散体PUD（Bayhydrol?）  多应用于单组分体系 特殊情况下也应用于类双组分体系 可与丙稀酸乳液拼用 水性聚氨酯多羟基化合物（Bayhydrol?）  -OH Functional 羟基 应用于双组分体系 水溶性聚异氰酸酯（Bayhydur?）  含-NCO端基 改性后可在水中分散 应用于双组分体系    聚氨酯分散体PUD 聚氨酯分散体PUD - Polyurethane Dispersion 完全反应的聚氨酯聚合物分散在水相中； 不含活性的-OH基和-NCO基； 成膜机理不是由于-OH基和-NCO基的反应固化，而是由于水和助溶剂的挥发，聚合物微粒聚结成膜。  Coalescence 聚合物微粒聚结成膜 Dispersion Concentration Coalescence Maturation 聚氨酯分散体化学中重要的反应         Components of a PUD  成份 Isocyanates 异氰酸脂 Polyols and glycols 多醇 Amine chain extenders 氨基链增长剂 Hydrophilic groups 亲水基团 Neutralizers 中和剂 Diisocyanates Commonly Used in PUDsPUD中常用的异氰酸脂 预聚物混合法 Advantages 优点 Easiest process to perform 容易操作的程序 Broad range of chemistries accessible 可容广范围的化学反应 Disadvantages 缺点 High viscosity of prepolymer requires co-solvent 高粘的预聚物需用溶剂 Use of aromatic di-isocyanates 不可用芳香族的异氰酸脂 Limit on neutralizing amines 中和用的氨基试剂有限 Reproducibility 重复性差  Acetone Process 丙酮工艺 Use acetone as a solvent for polymerization 利用丙酮为聚合反应溶剂来 Buildup prepolymer 生成预聚物 Chain extend 增链 Add in neutralizing agent 加入中和剂 Disperse in water 分散于水中 Distill off acetone 将丙酮蒸出 Allows for development of products with controlled architecture 允许开发预定分子结构的产品 Products can be made with no solvent 产品内无溶剂 Synthetic Variables Soft segment polyols Polyethers - flexibility Polyesters - weatherability, hardness Polycarbonates - hydrolytic stability Hard segment polyols Glycols Diols Amine chain extenders Dispersing agents Internal External Choice of Diisocyanate异氰酸脂的选择 aliphatics yield light and weather stability  脂肪族耐光, 具耐候性 Aromatic too reactive 芳香族的反应性过高 Hexamethylene diisocyanate (HDI) Elasticity 弹性 low temperature flexibility 低温下柔软性 Isophorone diisocyanate (IPDI) Hardness 硬度 High Tg 高Tg Hydrogenated MDI (H12MDI) mechanical properties-toughness 韧性 water / solvent resistance 耐水, 耐溶剂 Polyether Polyols 聚醚型共反应物 Advantages 优点 excellent stability against hydrolysis 优秀的抗水解性 good mechanical properties 良好的机椷性能 low Tg 低Tg low cost 价廉 Disadvantages 缺点 poor oxidative stability 抗氧化性差 high monool content 单体含量高 Polyester Polyols聚酯型共反应物 Advantages 优点 good weather stability 耐候性好 excellent mechanical properties (hardness, elasticity) 机椷性能 (硬度, 弹性等)好 excellent compatibility with other raw materials (additives, pigments, other binders) 与其他原材料互容性好 Disadvantages 缺点 strong influence of polyester monomers on hydrolytic stability 聚酯单体影响水解稳定性 Polycarbonate Polyols聚碳酸脂共反应物 Advantages 优点 excellent stability against hydrolysis 优秀的抗水解性 excellent stability against light and heat优秀的耐热,耐光 excellent weathering resistance优秀的耐候性 good mechanical properties 良好的机椷性能 Disadvantages 缺点 higher cost 价高 Advantages of Urethanes/Ureas聚脲/聚氨脂的优点 Hydrogen bonding (氢键) Acts as a crosslink  Will release under strain Allows for thermoplastic flow to relieve stress andallow self healing of defects. Typical Film Properties常见的薄膜性能 Solvent Resistance 耐溶剂性 Linear solvent swell after 24 hour immersion Hydrolytic Stability % Retention of tensile properties *films exposed at 70 C and 95% R.H. 聚氨酯分散体的技术特性Technical Aspects of PUD’s 
拜耳水性分散体资料.ppt