附着力增强型EG-BPSQ/SiO_(2)防雾减反射涂层的设计及制备

Design and preparation of adhesion-enhanced EG-BPSQ/SiO_(2) antifogging and antireflective coatings

在N2氛围下,以二甲基丙烯酸乙二醇酯(EGD)和3-巯基丙基三甲氧基硅烷(MPTMS)为单体[n(EGD)∶n(MPTMS)=1.0∶2.4],以1,8-二氮杂环[5,4,0]十一碳-7-烯(DBU)为催化剂,经巯-烯点击反应制备了巯醚-酯基桥连倍半硅氧烷(EG-BSQ)前驱体,再与乙酸和NaOH反应得到了EG预聚物(EG-BPSQ);然后,EG预聚物和SiO_(2)溶胶原位水解缩聚制备了EG-BPSQ/SiO_(2)(简称S-EG)复合溶胶;最后,采用浸渍提拉法制备了S-EG复合涂层。采用FTIR、SEM对S-EG复合涂层进行了表征,考察了V(EG预聚物)∶V(SiO_(2)溶胶)及处理温度对制备的S-EG复合涂层的静态水接触角、透过率、附着力、防雾性能和减反射性能的影响。结果表明,在SiO_(2)溶胶中引入EG-BPSQ,可以增强SiO_(2)纳米颗粒彼此之间、涂层与基底之间的黏结性能,EG-BPSQ同时具有着“黏结”与“造孔”的作用。当V(EG预聚物)∶V(SiO_(2)溶胶)=1∶3、处理温度为150℃时,复合涂层(HT-S-EG-3C)光透过率高达98.5%,比空白基底提高约8%,附着力均达到0级;静态水接触角为15°,较高的亲水性使其具有防雾效果和减反射性能。

Thioether-ester-bridged sesquioxane(EG-BSQ)precursor was prepared from mercaptoene click reaction of ethylene dimethacrylate(EGD)and 3-mercaptopropyl trimethoxysilane(MPTMS)[n(EGD)∶n(MPTMS)=1.0∶2.4]at the catalysis of 1,8-diazecyclic[5,4,0]undeca-7-ene(DBU)under N2 atmosphere,and then reacted with acetic acid and NaOH to obtain EG prepolymer(EG-BPSQ),which was further reacted with SiO_(2)sol through in situ hydrolytic polycondensation to synthesize S-EG composite sols.Finally,EG-BPSQ/SiO_(2)(S-EG for short)composite coatings were obtained via impregnation pulling method,and characterized by FTIR and SEM.The effects of V(EG prepolymer)∶V(SiO_(2)sol)and treatment temperature on static water contact angle,transmittance,adhesion,anti-fog and anti-reflection performance of S-EG composite coatings were investigated.The results showed that the introduction of EG-BPSQ into SiO_(2)sol enhanced the bonding between SiO_(2)nanoparticles as well as coating and substrate,EG-BPSQ displayed the effect of"bonding"and"pore formation"at the same time.When V(EG prepolymer)∶V(SiO_(2)sol)=1∶3 and treatment temperature 150℃,the transmittability of the composite coating(HT-S-EG-3C)reached up to 98.5%,~8%higher than that of the blank substrate,while the adhesion reached grade 0.Static water contact angle of 15°indicated high hydrophilicity,which led to anti-fog and anti-reflection performance.