Study On Preparation And Properties Of Bionic Superhydrophobic PPS-based Composite Coatings

New material is the cornerstone of scientific and technological progress.Research and development of the bionic functional integrated new materials are one of the hotspots of material research in the 21st century.Hydrophobic materials,especially superhydrophobic materials have attracted increasing attention because it is widely practical application value.Due to light weight,easy molding,high temperature resistance,wear resistance and many other advantages,polymer materials have attracted much attention of scientists.The research of preparation low-cost superhydrophobic coatings has rarely been reported through simple process at home and abroad,as well as the research of bionic polyphenylene sulfide(PPS)base composite coatings on friction and wear properties.Because of these limitations and downsides,there is an interest in bionic PPS base composite coatings with good friction and wear properties for process,material,and economical reasons.In this paper,an attempt has been made to prepare porous PPS super-hydrophobic composites by molding-desalting and hydrothermal method.The coatings have used NaCl as pore-forming reagent and PPS as matrix,and the hydrophobic properties are also explored.A simple spray engineering method is used to fabricate superhydrophobic coatings with the good performance,such as high temperature tolerance and wear-resistance.The surface structure and tribological property of PPS base composite coatings are analyzed from many perspectives by using SEM,XRD,FT-IR and the tribological tester.The main contents and conclusions of this work are summarized as follows:(1)It is investigated that preparing biomimetic PPS-based composite material using micro-NaCl as a pore-forming reagent.The bulk materials treated by hydrothermal method show hydrophobic and oleophobic properties.The micro-structure of the materials indicates that the structure grown from the hole by hydrothermal method has a greater impact on the hydrophobic properties of the coatings.(2)Biomimetic PPS-based composite superhydrophic coatings are prepared with a pore-forming reagent of nano/micro NaCl.And the research of the heat-and wear-resistance properties of the pore coatings is studied.Results indicate that the PPS-based composite coatings using NaCl as pore-forming reagent is superhydropho-bic,the contact angle is 157°.And the porous PPS-based composite coating can achieve superhydrophobic when the content of NaCl is 5 wt.%,and the coating still remains superhydrophobic when the content of NaCl increases to 10 wt.%.Porous PPS-based composite coatings have almost no quality loss at 200?,and the quality loss is less than 8%at 500?,demonstrating the heat-resisence.In addition,the porous PPS-based composite coatings also have preferable performance on the friction and wear experiments,the 5 wt.%-10 wt.%NaCl coatings can remain 21 h with slight friction marks under the 1.4MPa.(3)The PPS-based coatings with low surface energy materials and the nano/micro structure design have the excellent superhydrophobic,heat-and wear-resistance properties.Results indicated that CNT and PDMS can effectively affect the superhydrophobic properties.The contact angle of the PPS-based coating with 0.5 wt.%CNT is 161°,and the contact angle of the PPS-based coating with 0.5 wt.%CNT and 5 wt.%NH4HCO3 is 167°.While without the CNT modified,the highest contact angle of the PPS/PTFE surface,with papillae-like randomly distributed double-scale structure,can reach 162°.And when 1wt.%PDMS is added,the highest contact angle can hold on 172°.Even if under the high temperature circumstance,the coatings also keep the superhydrophobicity.And the coatings are not only super-hydrophobic but also oleophobic under the room temperature,such as the crude oil,glycerol or oil-water mixture.The PPS/45%PTFE coating does not show any sign of failure until the experiments is stopped(about 15 h)and the contact angle can still keep 130°.