BYK流平剂Levelingagents

• paint < substrate 涂料 < 底材
0,1% BYK-333 no additive 不含助剂
2020/3/9
Measuring surface tension of liquids using the Du-Nouy ringmethod (static)
使用提环法测量液体的静态表面 张力
溶剂挥发溶剂挥发
况
WPeWtaPpineaattiinnwpttaitwwihniiottthhuwotsiutsihltiilcisscoiiollniicnceooe=nn=ee239==3m32m09NNmm/m/mNN//mm 涂料不含有基硅 Substrate = 31 mN/m 底材
2020/3/9
Definition of surface tension 表面张力的定义
2020/3/9
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
1800 - 2900
Hammertone 锤纹
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Organic modified siloxane 有机改性硅氧烷
(CH3)3 Si O
CH3 Si O
CH3 Si O Si (CH3)3
• Polyether 聚醚
(EO / PO)
• Aralkyl 芳烷基
• Polyester 聚酯
2020/3/9
Adjusting flow and levelling 调节流动和流平
What improves levelling most: high or low surface tension?
如何改善流平？表面张力高还是低？
Mercury 水银
Smallest surface area = excellent levelling
• The higher these cohesive forces are, the higher the surface tension will be
内聚力越大，表面张力越高
Water
水
hydrocarbons
烃
73 mN/m = strong cohesive forces
强内聚力
23 mN/m = no cohesive forces
没有内聚力
2020/3/9
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。
最小的表面积 ＝ 最好的流平
Surface tension = 484 mN/m 表面张力 ＝ 484 mN/m
higher surface tension = better levelling!
更高的表面张力＝更好的流平！
2020/3/9
Adjustment of Flow and Levelling (continued) 调节流动和流平（续）
- 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 - 202S0/3il/c9 lean for easy to clean surfaces 表面易清洁产品
2020/3/9
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
- Formation and prevention of craters 缩孔的形成和避免 - Definition and improvement of flow and levelling - 流动和流平的定义和流动和流平的定义的改进 - Silicones to adjust surface slip 有机硅调整滑爽
higher surface tension 高表面张力
Surface 表面
lower surface tension 低表面张力
Cross
Section 截面
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Bénard Cells 贝纳德漩涡
2020/3/9
Avoiding Bénard cells by
adding silicones 通过加入有机硅避免贝纳德漩涡
Paint 油漆(30 mN)
Dirt 污垢 (28 mN)
2020/3/9
Substrate 底材 32 mN
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)
2020/3/9
• reactive 反应型
- Acrylic 丙烯酸
- COOH 羧酸
有机改性
- OH 羟基
y
2020/3/9
Organic Modification
Alkyl
芳烷基
x
Alkyl mN/m
CH3 21 CH2CH3 26 (CH2)9CH3 32
Substrate wetting* 底材润湿
• Good substrate wetting: • 良好的底材润湿：
mN/m
底材润湿
2020/3/9
0,05
0,1
Additive dosage
助剂添加量
Volume to Surface Area* 从体积到表面积
A(rea)
50 µm
V(olume)
2020/3/9
10 µm
Reduction of surface tension
with organic modified
Orientation of organic
modified siloxanes CH3
CH3
CH3
CH3
CH3
CH3
CH3
CH3
CH3
(CH3)3Si
O
Si O CH3
改性有机硅定向 Si O Si O Si O Si O Si O Si O Si
CH3
CH3
CH3
O
Si O CH3
Si(CH3)3
Substrate底材 32 mN
2020/3/9
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
Solvents 溶剂
Resins 树脂
Subtrates 底材
80
70
Water 水
60
Melamine resin
氨基树脂
Phosphatized steel
磷化钢材
50
water-borne 水性
40
30
Xylene 二甲苯
Acrylate Alkyd resin 丙烯酸
醇酸树脂
Untreated steel 无处理钢材
Paint 油漆
CH3
CH3
CH3
CH3
CH3
CH3
CH3
(CH3)3Si O Si O Si O Si O Si O Si O Si O Si O Si O Si O Si(CH3)3
CH3
CH3
CH3
CH3
CH3
CH3
CH3
2020/3/9
Substrate 底材
Typical surface tensions* 各物质的表面张力
mN/m
siloxanes
有3改0 性有机硅氧烷降低表面张力
29 BYK-320
28
BYK-331
Flow/Levelling
Substrate wetting/ Anti Cratering
27 BYK-300
26
BYK-310
BYK-333
25
流动 底材润湿
流平
抗缩孔
Dosage
添加量
2020/3/9
SMC-Polyester 聚酯
20
white spirit 白电油
Polypropylene 聚丙烯
mN/m
2020/3/9
Substrate wetting and interfaces during coating
application 涂料施工中的底材润湿和界面状 SolventSEovlvaepnotraEtvioanporation
2020/3/9
Polydimethylsiloxane 聚二甲基硅氧烷
(CH3)3 Si O Compatible 相容
CH3 Si O
Si (CH3)3
CH3 x
Incompatible 不相容
x
2 - 27
45 - 230
Flow 流动
Swenku.baidu.comrface slip 表面滑爽
380 - 1500
Defoaming 消泡
2020/3/9
Fmax - FV
= L * cos
CMC (critical micelle
concentration) in solutions Surfactant:
Hydrophobic 憎水 (tail) 尾
containing surfactants 溶液中 表面活性剂
Hydrophilic 亲水(head) 头
Levelling: definition 流平：定义
After application 施工后
After drying 干燥后
Levelling
(smallest possible interface liquid/air)
流平（尽可能小的气/液界面）
2020/3/9
Flow and Levelling 流动和流平
• What influences flow and levelling? 影响流动和流平的因素？ – Rheology 触变性 – Time 时间 – Surface tension 表面张力 – Bénard cells 贝纳德漩涡
• How to improve flow and levelling? 如何改善流动和流平？ – Deflocculating W+D-additives (rheology in pigmented systems) 解絮凝润湿分散剂（在颜料体系中触变） – Solvents (drying time) 溶剂（干燥时间） – Resins 树脂 – Additives (Surface Tension) 助剂（表面张力）
75
70
Surface tension mN/m
65
含6505 表面活性剂的临界胶束浓度
50
45
40
35
30
25
20
15
表面 10
张力 5
0
Air Surface
Water
0
1
10
100
1000
10000
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Concentration mg/L 含量
Substrate wetting*
Surface EffectsQ • Causes for and表ov面erc效om果ing of surface
defects • 表面缺陷的原因和解决办法
2020/3/9
Crater (contamination from
outside)
缩孔（受外因影响） Particle/粒子 Droplet/液滴
Control 空白
2020/3/9
0,2% BYK-306
Flow and Levelling* 流动和流平
A sphere is the smallest surface area possible perfect flow and leveling 球体拥有最小的表面积 最优异的流动和流平
F
25
mN/m
F
35
mN/m
2020/3/9
Formation of Bénard cells 贝纳德漩涡的形成