摘要
超疏水性赋予各种基材惊人的多功能特性,然而,涂层和基材之间的脆弱连接限制了超疏水涂层的应用领域和使用寿命。采用2-(全氟己基)乙基甲基丙烯酸酯和三甲氧基氢硅烷反应生成含氟硅烷偶联剂,与有机聚硅氮烷(OPSZ)经过机械混合得到了含氟改性的OPSZ涂层材料,最后将其与微纳米SiO_(2)颗粒掺杂后,使用普遍适用于各种基材的喷涂法制备了一种耐久性超疏水涂层。所制备的超疏水涂层在经历360 cm(载荷50 g)的砂纸摩擦或者12次胶带剥离测试(附着力1.75 N/cm)后,水接触角仍在150°以上,水滴可如荷叶表面般自由滚动。该工作为制备具有优异耐久性的疏水/超疏水涂层提供了一种简便的方法,在防污、防腐等方面具有潜在的应用前景。
Introduction Fluorinated silane coupling agent was generated by reacting 2-(perfluorohexyl)ethyl methacrylate with trimethoxysilane,and then mechanically mixed with organic polysilazane(OPSZ)to obtain fluorinated modified OPSZ coating material.Finally,it was doped with micro nano SiO_(2)particles and a durable superhydrophobic coating was prepared using a spray coating method that is widely applicable to various substrates.The prepared superhydrophobic coating still has a water contact angle of over 150°after undergoing 360 cm(load of 50 g)sandpaper friction or 12 tape peeling tests(adhesion of 1.75 N/cm),and water droplets can roll freely like lotus leaf surfaces.This work provides a simple method for preparing hydrophobic/superhydrophobic coatings with excellent durability,and has potential applications in anti fouling,anti-corrosion,and other aspects.Methods According to the National Standard of China GB/T 9286—1998“Cross cut test for film of paint and varnish”,the adhesion of the coating to the substrate was determined by cross-cutting the film.According to the National Standard of China GB/T 6739—2006“Determination of film hardness by pencil method for paint and varnish”,the pencil hardness of the prepared coating was determined using a QHQ-A pencil hardness meter.According to the National Standard of China GB/T 23989—2009“Determination of solvent resistance wiping resistance of coatings”,the resistance to MEK wiping off the prepared coating was determined.Tape peeling and sandpaper abrasion were used to test the mechanical stability of the coating.The 3M tape(adhesive,1.75 N/m)was pressed onto the coated surface for 30 s with a 100 g loading before being entirely peeled off.In this experiment,we designated the press-peeling procedure as one testing cycle.Every two press-peeling cycles,the WCAs and SAs of the coating were monitored to evaluate the coating/substrate interfacial adhesive strength between the coating and the substrate.A 25 mm×25 mm coating loaded with 50 g weights was placed face-to-face with sandpaper(1500 grit)and pulled horizontally at a uniform speed for the sandpaper abrasion test.The WCAs and SAs of the coatings were measured to demonstrate mechanical stability after each 40 cm abrasion distance.Aqueous solutions of pH=1,4,7,10,13 were configured using H_(2)SO_(4) and NaOH,in which the coatings were placed for 24 h and 3.5%NaCl solution for 72 h to measure the WCA and SA values and to assess their resistance to acid and alkali corrosion and salt.The samples were exposed to UV light for 48 hours to assess weathering resistance.The self-cleaning properties of the coatings were tested by contaminant removal experiments on the coated surfaces using carbon black nanoparticles as contaminants.In addition,it was evaluated how well the coatings cleaned themselves after exposure to red wine,cola,fruit juice,tea,milk,and coffee.Results and discussion A durable high-hydrophobic coating based on Fluorinated silane coupling agent-modified OPSZ was designed and realized through a one-step synthesis method and spraying process,with a water contact angle of up to 115°and the coating hardness of up to 4H and excellent adhesion By adding micro-nano SiO_(2)particles,a superhydrophobic coating with a water contact angle of 156.3°and a rolling angle of 5.6°was successfully prepared.The superhydrophobic coating still had excellent hydrophobic properties after undergoing 12 cycles of tape stripping or 360 cm sandpaper rubbing test.This was due to the excellent anchoring characteristics of polysilazane and the excellent low surface energy of modified OPSZ,which resulted in good coating durability.After being doped with micro-nano SiO_(2)particles,a durable superhydrophobic coating was prepared using a spraying method commonly applicable to various substrates Conclusions This coating has the advantages of low process cost and convenient operation and can be used to develop large-scale,durable superhydrophobic coatings with broad application prospects and practical value.In conclusion,this study provides a new solution for developing new superhydrophobic coatings.
作者
王琦
彭梦圆
汪小鹏
沙敏
张丁
姜标
WANG Qi;PENG Mengyuan;WANG Xiaopeng;SHA Min;ZHANG Ding;JIANG Biao(School of Chemistry and Chemical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;Xi'an Aerospace Chemical Propulsion Co.,Ltd.,Xi'an 710025,China;Key Laboratory of Fluorine and Nitrogen Chemistry and Advanced Materials,Chinese Academy of Sciences,Shanghai 200032,China)
出处
《硅酸盐学报》
北大核心
2025年第8期2248-2263,共16页
Journal of The Chinese Ceramic Society
基金
国家重点研发计划(2022YFC3004901-3)
国家自然科学基金(21908109)
应急管理部消防应急救援装备重点实验室开放项目(2020XFZB05)。
