煅烧硅藻土消光助剂制备与应用研究

Synthesis and Application Research on Extinction Effect of Calcined Diatomite

首次采用煅烧硅藻土制备出用于苯丙乳液、纯丙乳液涂料的消光助剂。煅烧温度与煅烧助剂影响产物白度和晶体结构,颗粒形貌影响产品消光性能,粒度级配影响涂层高入射角区域的消光效果。当添加4wt%NaCl、7.5wt%淀粉,900℃煅烧2h时,可获时白度为90%、晶态产物;物料粒度主要为8μm～25μm时,60o、85o的光泽度接近,消光率分别可达51%、65%。

Calcined diatomite matting agent was f irstly prepared. This matting agent applies in styrene-acrylic emulsion and acrylic emulsion. The whiteness and crystal structure are in？ uenced by calcined temperature and additive. And the granule appearance and granularity distribution can work on extinction capability and extinction effect of high angle, respectively. Crystal product with the whiteness of 90% was synthesized by adding 4wt% NaCl and 7.5wt% amylum. The reaction temperature is 900℃ and the reaction time is 2h. When the granularity distribution mainly focuses on 8μm-25μm, the glossiness of the coating is adjacent with the angles of incidence are 60° and 85°. And the extinction efficiency can reach 51% and 65%, respectively.