摘要
以碳酸钙和磷酸为原料制备活性磷酸钙悬浮聚合分散剂。用SEM、XRD、BET氮吸附等对产物进行表征。结果表明，制得的活性磷酸钙分散剂具有多孔结构，堆密度小，比表面积大，粒度均匀，微粒间不易团聚。较佳的合成条件为：碳酸钙水悬浮液的固含量90g／L、磷酸浓度1．0mol／L、反应／陈化温度50℃、陈化时间3h，所制得的多孔悬浮聚合分散剂的比表面积为106．8m^2／g，约为日本及市售国产活性磷酸钙分散剂比表面积的1．5～1．8倍。在苯乙烯悬浮聚合中的应用结果表明，多孔结构的磷酸钙分散剂表面活性高，悬浮分散性和稳定性优良，能显著提高聚苯乙烯珠粒的质量。
The porous hydroxyapatite （HAP） used as suspension polymerization dispersant was prepared using calcium carbonate and phosphoric acid as starting materials. The samples were characterized by SEM, XRD and BET Nitrogen Adsorption Instrument. The results showed that the prepared HAP has porous structure, low apparent density, large specific surface area, uniform particle size and is not agglomerate between the particles. The optimal preparation conditions for the HAP were determined as follows： solid content of calcium carbonate aqueous suspension 90 g/L, concentration of phosphor 1.0 mol/L, reaction/aging temperature 50 ℃, aging time 3h. The HAP prepared at optimal preparation conditions has a specific surface area of 106.8 m^2/g, 1.5 - 1.8 times that of Japa- nese HAP and selling HAP. The results of the application in the suspension polymerization of styrene showed that the porous HAP dispersant has high surface activity, excellent suspension dispersibility and stability and can markedly improve the quality of polystyrene beads.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2006年第6期73-78,共6页
Journal of Sichuan University (Engineering Science Edition)
关键词
活性磷酸钙
多孔结构
无机分散剂
悬浮聚合
hydroxyapatite
porous structure
inorganic dispersant
suspension polymerization
