硬脂酸改性凹土增强聚氨酯革的分析表征

The Methodology and Mechanism Analysis of Stearic Acid-modified Attapulgite Reinforcing Polyurethane Leather

表观性能和力学性能测试表明,经1%硬脂酸表面处理的凹土所制备的革样PU(NO#-e1)的性能显著提高;扫描电镜对革的微观结构和形貌的考察显示,凹土(No#-e1)中的凹土和白云石皆能够均匀的充分分散于聚氨酯中与聚氨酯树脂有效的溶合;傅立叶红外光谱、失重热示分析认为,硬脂酸通过化学反应使凹土、白云石与聚氨酯树脂有效溶合,从而提高凹土的填充性能,进而提高聚氨酯革的力学性能。

The tensile strength of polyurethane leather filled with stearic acid-modified attapulgite can reach radial 153 N, latitudinal 156 N, the tearing strength of it can achieve redial 38 N, latitudinal 57 N. The extension ratio at treak can reach radial 335 %, latitudinal 120 %, which is about 18,6 times and 2,9 times as big as the samply with no filling agent, about 8.5 times and 3.2 times as big as the sample filled with light calcium carbonate, about 14 times and 2,5 times as big as the sample filled with heat treatment attapugite, respectively, All performance data of polyurethane leather exceed QB 1646-92 request after filled 10% attapulgite modified with 1% stearic acid or filled 10% attapulgite dealt with simple heat treatment, and the performance of attapulgite modified with stearic acid is better than that with simple heat treatment. The SEM show that both of attapulgite and its impurity dolomite after modified with stearic acid can uniformly and compatibly disperse in polyurethane leather. Thermogrzavimetric analyzer（TGA）and FT-IR spectrum indicated the interaction between attapulgite and polyurethane leather enhanced by stearic acid is the main factor for thermodynamic and mechanical performance improvement of the polyurethane leather.