摘要
本文通过添加硅微粉来部分替代钛白粉,制得的复合粉体以应用于粉末涂料中,从而提高了漆膜的硬度,耐热等性能。主要考察了喷涂电压、固化温度和固化时间施工工艺,测试了不同配比的复合粉体(硅微粉:钛白粉为0∶1、1∶1、2∶1、3∶1、1∶0)粉末涂料漆膜的白度、光泽度、硬度、耐冲击力以及耐热性等性能。结果表明,研究中粉末涂料最佳施工工艺条件为:喷涂电压70 k V、固化温度180℃、固化时间20 min。硅微粉的添加提高了漆膜的硬度,铅笔硬度由3 H达到5 H;漆膜的抗冲击力高于50 kg·cm;同时也提高了漆膜的耐热性,涂膜的Tp由433.19℃上升到440.76℃;漆膜的光泽度有所降低,由78%降到66%;白度由88.5%降到39%。当硅微粉与钛白粉的配比为1∶1时,漆膜综合性能最好,铅笔硬度为4 H、耐冲击力高于50 kg·cm、光泽度达到75%、白度达到82%。复合微粉的粉末涂料,基本性能保持不变,降低了涂料的生产成本,为制备高硬度和耐冲击涂料提供了依据。
In order to enhance the hardness, heat resistance of the powder coatings films, the composite powder is fabricated by adding silicon powder to partly replace titanium dioxide and utilized in powder coating. The construction technology including spray voltage, curing temperature and curing time were investigated as well as comparing the properties of hardness, anti-impact force and heat resistance of the powder coatings at different ratio of silicon powder and titanium dioxide （0： 1,1： 1, 2： 1, 3： 1, 1：0）. The obtained results showed that the optimum construction technology of the powder coatings like spraying voltage, curing temperature and curing time were 70 kV, 180 ℃, 20 vain, respectively. With the ratio of silicon powder and titanium dioxide increasing, the pencil hardness of the films was increased from 3 H to 5 H,the anti-impact force of the films appeared higher than 50 kg · cm, the heat resistance of the films was improved for the Tp of the film increased from 440.76℃ to 433.19 ℃, the gloss and the whiteness of the film were decreased from 78% to 66% and from 88.5% to 39%, respectively. When the ratio of silicon powder and titanium dioxide is 1 ： 1, the overall properties of films are the best. The pencil hardness and anti-impact force of the films were 4 H, higher than 50 kg · cm. The gloss and whiteness of the films are as high as 75% and 82%, respectively. After adding the composite powder, the production cost of the powder coatings has been reduced and the basic performance maintained. It provided the basic theory for the preparation of films with high hardness and anti-impact force.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2016年第1期254-260,共7页
Bulletin of the Chinese Ceramic Society
关键词
硅微粉
粉末涂料
性能
silicon powder
powder coating
property
