Preparation and Properties of Hydrophobic Siloxane Modified Polyurethane Based Coating
The synthesis of a bis-silane-modified polyurethane was accomplished using octadecylamine(OA)and γ-glycidoxypropyltrimethoxysilane(KH-560)as chain extenders(OA-560),followed by stepwise addition with isophorone diisocyanate(IPDI)and poly(tetramethylene ether)glycol(PTMG).The synthesis was completed by capping with γ-aminopropyltriethoxysilane(ATS).The structure of the product was characterized using Fourier Transform Infrared Spectroscopy(FTIR),while the distribution of silicon on the coating surface was determined via X-ray Photoelectron Spectroscopy(XPS).Adhesion strength,water resistance,thermal stability,and hydrophobicity of the bis-silane-modified polyurethane were also evaluated.Results showed that after modification,the material could withstand a tensile strength of nearly 9 MPa in the vertical direction,had a water absorption rate of only 0.5％,an initial decomposition temperature increased to 350 ℃,and a contact angle improved to 102°.
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