硫醇改性丙烯酸制备自清洁涂层  

Preparation of Self-cleaning Acrylic Acid Coatings by Thiol Modified

作　　者：杨志 杨槟桦 向薪宇 吴桐 许正洪 卢建红 YANG Zhi;YANG Bin-hua;XIANG Xin-yu;WU Tong;XU Zheng-hong;LU Jian-hong(School of Materials Science and Engineering,Sichuan University of Science&Engineering,Zigong 643000,Sichuan,China;Material Corrosion and Protection Key Laboratory of Sichuan Province,Zigong 643000,Sichuan,China)

机构地区：[1]四川轻化工大学材料科学与工程学院,四川自贡643000 [2]材料腐蚀与防护四川省重点实验室,四川自贡643000

出　　处：《现代涂料与涂装》2023年第4期8-13,59,共7页Modern Paint & Finishing

基　　金：大学生创新创业训练计划项目S202010622041;材料腐蚀与防护四川省重点实验室基金项目2021CL02;高校人才引进项目2021RC01。

摘　　要：采用无氟的十八烷基硫醇对丙烯酸树脂进行改性,制备出具有自清洁性的疏水涂层.对改性前后涂膜的自清洁性、接触角、吸水率、缓蚀率、分子结构和动态机械热力学进行分析.结果表明:硫醇改性丙烯酸树脂后,在表面构造出低表面能-微观粗糙结构,"气垫效应"使表面呈现良好的自清洁性;涂层表面接触角随树脂中加入硫醇浓度的增加而变大,并由亲水性转变为疏水性,以加入量5%时疏水性最强,接触角增长38.52°,表面出现明显的乳突结构;改性涂膜吸水率下降,硫醇含量为5%时最低,仅为0.31%;硫醇的加入可使丙烯酸耐蚀能力提升,加入量为5%时缓蚀率最高;傅里叶变换红外光谱分析反映了硫醇在丙烯酸树脂中的致密和准结晶的特定排列取向;硫醇与丙烯酸有良好相容性,使改性材料的玻璃化温度降低,其储能模量和热稳定性也降低,柔韧性增加,扩展了丙烯酸树脂的有效阻尼温域.Self-cleaning hydrophobic acrylic coatings were prepared by fluorine-free octadecyl mercaptan(ODT).The self-cleaning,contact angle,water absorption,inhibition efficiency,molecular architecture and dynamic mechanical analysis(DMA)of acrylic coating before and after modification were analyzed.The results showed that the substrate surface with thiol modification had micro rough structure with low surface energy,and the"air cushion effect"made the surface good self-cleaning.The contact angle increases as ODT was added,along with the change from hydrophilicity to hydrophobicity.Adding 5%ODT,the hydrophobicity reached the highest,and also there was an obvious"marginal papillae"structure on the surface,and the contact angle was increased by 38.52°.The water absorption of modified film was reduced,and was only 0.31%when adding 5%ODT,showing the lowest absorption.The addition of ODT could improve the corrosion resistance of acrylic resin.When the addition amount was 5%,the inhibition efficiency was the highest.The compact structure and special orientation ar-rangement of quasi crystalline with mercaptans modification was confirmed by FT-IR testing.Mercaptan had good compatibility with acrylic resin,adding thiol reduced the glass transition temperature of film,also reduced its storage modulus and thermal stability,but expanded its flexibility and the effective damping temperature range.

关 键 词：自清洁性 疏水性 耐腐蚀性 气垫效应 硫醇 

分 类 号：TQ637[化学工程—精细化工]