硅烷偶联剂对不锈钢表面膜基结合强度的影响

运用拉伸法研究了硅烷偶联剂对316L不锈钢高分子涂层的结合强度的影响。并对硅烷偶联剂的含量、预处理时间及pH值等工艺条件进行了优化。采用ATRIR,XPS等技术表征了偶联剂提高膜基结合强度的机理。结果表明:硅烷偶联剂能够显著提高不锈钢与高分子涂层之间的结合强度,最佳的工艺条件为:偶联剂含量w=0.05,处理时间为10s,溶液的pH值为6。作用机理是:偶联剂一端与金属生成了Si-O-Me键,另一端与高分子相互缠绕形成了复杂的互穿网络结构。

Behaviour of Silicate Melts in Respect of Volume

The volumes per oxygen of some silicate melts have been calculated and then compared with those of silicate glasses.It is suggested that the volume of a silicate melt can be divided into two parts.One is contri buted by the silicon-oxygen network and the other by the “oxides”.Variation patterns of VPOs suggest that the volume of the Si-O network generally remains unchanged and the expansion of the melt is caused mainly by the locat expansion of the “oxides”.It is further proposed that the radius of O^2- shows little variation,in striking contrast to the radius of cations.The mechanism governing the expansion is discussed in detail.

无机富锌涂料在410℃以下作为耐高温底涂料的应用

有机硅树脂结构中含硅-氧键，涂膜具有良好的耐高温性能，因其化学组分与含量的不同，涂膜耐热性能自150-600℃不等，因价格昂贵，一般仅涂装两道底涂料和两道面涂料，每道干膜厚度为30um，涂膜厚度仅120um。