聚丙烯酸酯/纳米TiO2复合皮革涂饰剂的研究

以钛酸丁酯为纳米TiO2的前驱体,丙烯酰胺、醋酸乙烯酯、甲基丙烯酸甲酯、丙烯酸丁酯为单体,乙烯基三乙氧基硅烷(A-151)为偶联剂,采用双原位乳液聚合法制备聚丙烯酸酯/纳米TiO2复合涂饰剂。考察引发剂用量、反应时间及钛酸丁酯用量对乳液及其涂膜性能的影响,并采用红外光谱和透射电镜对复合涂饰剂的结构进行表征。结果表明,随着引发剂和钛酸丁酯用量的增加,涂膜的抗张强度先减小后增大,断裂伸长率先增大后减小,耐水性先增加后减弱;而随着反应时间的延长,涂膜的抗张强度及断裂伸长率呈现与引发剂和钛酸丁酯用量相反的趋势,耐水性基本呈现减弱趋势。红外光谱及透射电镜结果表明纳米TiO2存在于聚丙烯酸酯中,且主要存在于聚丙烯酸酯乳胶粒的表面。

Study on polyacrylate/nano-TiO2 composite for leather finishing agent

Polyacrylate/nano-TiO2 composite was prepared via in situ polymerization,in which butyl titanate was used as precursor of TiO2,AM,VAc,BA,MA were chosen as monomers and A-151 was chosen as silane coupling agent.The effects of initiator and butyl titanate contents,reaction time on properties of polyacrylate/nano-TiO2 composite emulsion and films were investigated.The structure of composite was characterized by FT-IR and TEM.The results show that with the dosage of initiator and butyl titanate increasing,the tensile strength of films decreases first and then increases,but the elongation at break increases first and then decreases.The water resistance of films increases first and then declines.With the prolonging of reaction time,the tensile strength and elongation at break of films show an opposite trend,compared with the dosage of initiator and butyl titanate.The water resistance of films presents downtrend basically.The FT-IR and TEM show that nano-TiO2 exists in polyacrylate,and mainly exists in surface of the polyacrylate latex particles.