氟硅结构对UV涂料疏水疏油性的影响

UV防污助剂主要包括有机氟和有机硅等,前者结构主要是全氟聚醚链段,后者结构主要是聚二甲基硅氧烷链,利用氟硅的低表面张力起到防污作用,所以主要链段结构的细微差异会导致性能的明显变化。本文选取C1607、C1603和KY1203分别代表聚二甲基硅氧烷、K型全氟聚醚链段和Z型全氟聚醚链段,并与UV涂料复配和固化,研究不同氟硅链段对UV涂料的疏水疏油性能的影响规律。结果证明,聚二甲基硅氧烷链段具有较强的迁移性,低添加量就可达到疏水效果,但仅能应用于低端的防水防油需求。全氟聚醚类UV防污助剂的疏水疏油性能要远优于有机硅,在较高添加量时K型全氟聚醚类UV防污助剂具有更强的疏水疏油性能。

Effect of the Fluorine or Silicone Containing Chain on the Hydrophobicity and Oleophobicity of UV Coating

Fluorosilicone has very low surface energy, poor solubility with common hydrocarbon compounds in UV coating. So they can easily move to the surface of coating film during the process of pre-heating and UV photocuring, realizing the hydrophobicity and oleophobicity. The common UV anti-stain additives include organofluoro compound and organosilicone compound, and their structural difference could affect the hydrophobicity and oleophobicity. Three kinds of UV anti-stain additives were studied in this paper, C1607 with polydimethylsiloxane chain, KY1203 with Z-type perfluoropolyether chain, C1603 with the K-type perfluoropolyether chain. And then they were mixed with common UV coating compounds and cured with UV machine. The effects of structure difference on the hydrophobicity and oleophobicity were researched. It was found that polydimethylsiloxane chain had the best flexibility and movability, and had the good hydryophobicity with low concentration, so it can only be used in low-level water-proof and oil-proof coatings. The UV anti-stain additive based on perfluoropolyether has the more better hydrophobicity and oleophobicity than silicone. The UV anti-stain additive based on K-type perfluoropolyether has the much better hydrophobicity and oleophobicity than Z-type perfluoropolyether with high additive content.