BYK流平剂(Leveling agents)

Paint 油漆
CH3 (CH3)3Si O Si CH3 O
CH3 Si O
CH3 Si CH3 O Si CH3 O
CH3 Si CH3 O
CH3 Si O
CH3 Si CH3 O Si CH3 O
CH3 Si CH3 O Si(CH3)3
Substrate 底材
, Page 14, Peter van Dam, BYK-Chemie, PGM Surface Additives
内聚力越大，表面张力越高
Water
水
73 mN/m =
23 mN/m =
strong cohesive forces
强内聚力
hydrocarbons
烃
no cohesive forces
没有内聚力
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10 µm
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Reduction of surface tension with organic modified siloxanes 有改性有机硅氧烷降低表面张力
mN/m 30 29 28 27 BYK-320
Crater (contamination from outside) 缩孔（受外因影响）
Paint 油漆(30 mN)
Particle/粒子 Droplet/液滴 Dirt 污垢 (28 mN)
Substrate 底材 32 mN
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Crater (contamination of the substrate) 缩孔（底材被污染）
Paint 油漆(30 mN)
Droplet/Dirt 液滴/污垢 (28 mN)
Substrate底材 32 mN
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Surface EffectsQ 表面效果 Causes for and overcoming of surface defects 表面缺陷的原因和解决办法
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Typical surface tensions* 各物质的表面张力
Solvents 溶剂
Resins 树脂
Subtrates 底材
80
70 mN/m 60 50 water-borne 水性 40 30 20 Xylene 二甲苯 white spirit 白电油 Alkyd resin 醇酸树脂 Acrylate 丙烯酸 Untreated steel 无处理钢材 SMC-Polyester 聚酯 Polypropylene 聚丙烯 Water 水
CH3 Si O Si (CH3)3
Si O
Organic Modification
Alkyl
Alkyl CH3 CH2CH3 (CH2)9CH3
mN/m 21 26 32
芳烷基
有机改性
y
, Page 7, Peter van Dam, BYK-Chemie, PGM Surface Additives
Surface Additives 表面助剂
Silicones and Acrylates 有机硅和丙烯酸 Peter van Dam
Topics 主题
- Surface tension theory 表面张力理论 - Silicones to improve substrate wetting 有机硅促进底材润湿
SolventSolvent Evaporation Evaporation 溶剂挥发 溶剂挥发
Wet paint with silicone = 30 mN/m Wet Paint with silicone = 29 mN/m paint without silicone = 29 mN/m Paint without silicone = 33 mN/m 涂料不含有基硅 Substrate = 31 mN/m 底材
表面活性剂
70
65
Surface tension mN/m
60 55 50 45 40 35
30
25 20 15 10 5 0 0 1 10 100 1000 10000 Water Air Surface
表面 张力
Concentration mg/L
含量
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Objectives when formulating coatings* 涂料配方的目标 - excellent flow and levelling 优异的流动性和流平性 - sufficient substrate wetting 充分的底材润湿 - no crater 没有缩孔
- are directly related to the surface tension of this coating 直接关系到该涂料的表面张力 - organic modified silicones and acrylates influence the surface tension in such a way to improve these properties 改性有机硅和丙烯酸酯通过改变表面张力改善以上特性。
Crater formation 缩孔的形成
Paintdroplet into wet paint 涂料滴进湿膜中
left: same surface tension 左：相同表面张力 right: droplet with lower surface tension 右：液滴表面张力更低
, Page 20, Peter van Dam, BYK-Chemie, PGM Surface Additives
Surface tension 表面张力
• Molecules in liquids have a relatively high mobility 分子在液体中能相对的高速移动 • Inbetween the molecules there are cohesive forces 分子间存在着内聚力 • The higher these cohesive forces are, the higher the surface tension will be
Melamine resin 氨基树脂
Phosphatized steel 磷化钢材
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Substrate wetting and interfaces during coating application 涂料施工中的底材润湿和界面状况
Orientation of organic modified siloxanes 改性有机硅定向
CH3 (CH3)3Si O Si CH3 O CH3 Si O CH3 Si CH3 O CH3 Si O CH3 Si CH3 O CH3 Si O CH3 Si CH3 O CH3 Si O CH3 Si CH3 O Si(CH3)3
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Definition of surface tension 表面张力的定义
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Organic modified siloxane 有机改性硅氧烷
CH3 (CH3)3 Si O
• Polyether 聚醚 (EO / PO) • Aralkyl 芳烷基 • Polyester 聚酯 • reactive 反应型 - Acrylic 丙烯酸 - COOH 羧酸 - OH 羟基
- Acrylic levelling additives 丙烯酸酯流平剂 - Silicone surfactants 有机硅表面活性剂 - Dynamic surface tension reduction 降低动态表面张力 - Acrylated and OH-functional products 丙烯酸酯和羟基改性产品 - Silclean for easy to clean surfaces 表面易清洁产品
CMC (critical micelle concentration) in solutions containing surfactants 溶液中含表面活性剂的临界胶束浓 度
Surfactant:
75
Hydrophobic 憎水 (tail) 尾 Hydrophilic 亲水(head) 头
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Polydimethylsiloxane 聚二甲基硅氧烷
CH3 (CH3)3 Si O Si O Si (CH3)3
CH3 x Compatible 相容 x 2 - 27 Flow 流动 45 - 230 Surface slip 表面滑爽 Incompatible 不相容 380 - 1500 Defoaming 消泡 1800 - 2900 Hammertone 锤纹