铝翅片用有机-无机杂化超亲水涂料的制备

Preparation of organic-inorganic hybrid superhydrophilic coating for aluminum foil conditioner

以溶胶-凝胶法制得改性SiO2溶胶,然后与丙烯酸(AA)共聚得到有机-无机杂化材料,置换溶剂并调节pH后,制得水性有机-无机杂化超亲水涂料。研究了正硅酸乙酯(TEOS)和偶联剂KH-570的用量及pH对有机-无机杂化超亲水涂料的亲水性及水溶解率的影响。结果发现,当w(TEOS)=70%、pH=7和w(KH-570)=3%时,所制备的涂膜初期亲水性达到超亲水,涂层与水的接触角为3°,30次干湿循环后涂层的水接触角为11.7°,泡水100h后的水溶解率为16%,涂层与基材的附着力为0级,铅笔硬度7H,200°C耐热1h后涂层未发生色变。

An organic-inorganic hybrid material was synthesized by copolymerization of acrylic acid （AA） and modified SiO2 sol obtained by sol-gel method, and then used to prepare organic-inorganic hybrid superhydrophilic coatings by replacing solvent and adjusting pH. The effects of the amount of tetraethyl orthosilicate （TEOS） and coupling agent KH-570, and pH on the hydrophilicity and water dissolution rate of the coatings were studied. The results showed that the coating prepared with TEOS 70wt% and KH-570 3wt% at pH 7 has a water contact angle of 3° in early period, which is up to the demand of super- hydrophilicity. The water contact angle of the coating becomes 11.7° after dry and wet cycles for 30 times. The water dissolution rate of the coating is 16% after immersing in water for 100 h. The coating features an adhesion strength of 0 grade and a pencil hardness of 7H, and does not tarnish at 200℃ for 1 h.