乳液压力共附聚法制备纳米碳酸钙/天然橡胶复合材料的研究

Study on Nano-calcium Carbonate/NR Composite Prepared by Latex Co-agglomeration under Pressure

采用高压均质机制备纳米碳酸钙分散体,用乳液压力共附聚法制备纳米碳酸钙/天然橡胶(NR)复合材料,并对共附聚前后混合乳液微观结构,胶膜物理性能,胶料门尼粘度、动态弹性模量(G′)和损耗因子(tanδ)等进行研究。结果表明:经高压均质机处理的纳米碳酸钙分散体粒径小,分布窄,分散性好,沉降量小,贮存稳定;高压处理后纳米碳酸钙粒子与天然胶乳粒子发生了共附聚,纳米碳酸钙粒子分散良好,混合乳液胶膜物理性能明显提高;压力共附聚法制备的纳米碳酸钙/NR复合材料门尼粘度高,低应变下G′高,tanδ低,纳米碳酸钙粒子与NR之间相互作用强。

The dispersion of nano-calcium carbonate was prepared by high pressure homogenizer,and the nano-calcium carbonate/NR composite was prepared by latex co-agglomeration under pressure.The microstructure of blended latex filled with nano-calcium carbonate,the physical properties of the resulted films,and the Mooney viscosity,dynamic modulus（G＇） and loss factor（tanδ） of the composites were investigated.The results showed that,the dispersion of nano-calcium carbonate treated with high pressure homogenizer was good：low settlement,small particle size,narrow particle distribution and good storage stability.After co-agglomeration under pressure,the dispersion of nano-calcium carbonate in the compound was good.It was found that by using pressure during co-agglomeration,the physical properties of the composite latex film were improved significantly,the Mooney viscosity and G＇ at low strain amplitude of the compound increased,the tanδ of the compound was reduced,and the interaction between rubber and nano-calcium carbonate was improved.