纤维素酯改性后的沉淀碳酸钙用作造纸填料

Modification of precipitated calcium carbonate with cellulose esters and use as filler in paper making

为了获得用于造纸行业的新型改性填料,本研究利用沉淀碳酸钙(PCC)和纤维素酯(乙酸纤维素和乙酸丁酸纤维素)制备新型杂化材料(hybrid material)。采用新颖简单的操作步骤:将PC C的水悬浊液与纤维素衍生物的有机溶液混合,接着将所得的混合物加入至热水中以获得产物,并借助几种分析技术和光谱技术表征杂化材料的特点。通过碳元素分析或热重分析测定杂化材料中有机物的含量,经测定约为10%(重量百分比)。由于有机物的存在,相比于未改性的PCC,改性后PCC颗粒的平均尺寸略微增大。实验结果表明:将改性的PCCs用作造纸填料,纸张的一些强度性能会略有改善,而其结构性能和光学性能并没有受到影响。

New hybrid materials of precipitated calcium carbonate （PCC） and cellulose esters （cellulose acetate and cellulose acetate butyrate） were prepared aiming to obtain new modified fillers for papermaking. A novel simple procedure based on the mixing of an aqueous suspension of PCC with an organic solution of the cellulose derivative, followed by the addition of the resultant mixture to hot water, was followed. The hybrids were characterized by several analytical and spectroscopic techniques. The organics content in the hybrids determined based on the carbon elemental analysis or by thermogravimetry, was found to be of ca. 10wt%. Due to the presence of the organics the average size of the particles increased slightly in comparison to the unmodified PCC. Results of the modified PCCs as fillers in papermaking showed a slight improvement of some paper strength properties, whereas the structural and optical properties were not affected.