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Preparation and properties of fluorinated silicon two‐component polyurethane hydrophobic coatings
Author(s) -
Hu Linqing,
Pu Zejun,
Tian Yuhan,
Zheng Xiaoyi,
Cheng Jie,
Zhong Jiachun
Publication year - 2020
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.5973
Subject(s) - silanol , materials science , contact angle , isophorone diisocyanate , polyurethane , hydrophobic silica , polycarbonate , coating , siloxane , surface energy , chemical engineering , superhydrophobic coating , silane , surface roughness , composite material , epoxy , organic chemistry , polymer , chemistry , catalysis , engineering
A polyurethane (PU) hydrophobic coating was prepared by the two‐component method, polycarbonate diol and isophorone diisocyanate becoming a two‐phase composition. The PU films with hydrophobic surface were prepared by establishing a rough structure on the surface of silica (SiO 2 ) modified with silane coupling agents (γ‐(2,3‐epoxypropoxy)propytrimethoxysilane (KH560) and (heptadecafluoro‐1,1,2,2‐tetradecyl)trimethoxysilane (FAS)). First, the surface of SiO 2 was covered by a layer of hydrophobic methyl and fluorocarbon (C–F) groups. Then, the SiO 2 and modified SiO 2 were obtained by the introduction of KH560 and FAS with the silanol reaction by ultrasonic stirring. The effect of SiO 2 and modified SiO 2 on the structure and hydrophobic properties of PU was investigated by a series of test instruments. The results showed that the introduction of SiO 2 and modified SiO 2 was beneficial for increasing the roughness of the PU coating surface; the roughness of FAS/SiO 2 ‐PU could reach up to 14.790 nm, four times better than pure PU. A hydrophobic modified PU coating with water contact angle 123° was fabricated by using the hydrophobic C–F group FAS as a low surface energy material and establishing a micro rough structure on the surface of PU. Moreover, PU modified with KH560 and FAS can reduce the glass transition temperature ( T g ) of soft segments, resulting in improvement of micro‐phase separation. © 2020 Society of Chemical Industry