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Modification of PCC with agar and its application in papermaking

机译：用琼脂改性PCC及其在造纸中的应用

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Modification of filler with polysaccharides such as starch, cellulose and their derivatives by preflocculation is an effective means to overcome the main drawback of mechanical strength decline resulting from filler addition. Agar is a mucilaginous polysaccharide extracted from red algaes and was used to modify precipitated calcium carbonate (PCC) for papermaking in our studies. Results showed that when 0.03% cationic polyacrylamide (CPAM) was used as retention aid, tensile index of handsheets using agar (3%, based on PCC) modified PCC as filler was 29.5% higher than native PCC, whereas filler retention did not change obviously. Optical microscope observation and laser diffraction particle size analysis confirmed that PCC was flocculated and coated by agar after modification. Characterizations of mechanical strength and filler retention of handsheets at different filler content indicated the handsheets can be filled with about 10% more agar modified PCC but to maintain the same strength level.
机译：通过预偏移的多糖改性诸如淀粉，纤维素及其衍生物的多糖是克服填料加入引起的机械强度下降的主要缺点的有效方法。琼脂是一种从红藻类中提取的粘膜多糖，用于改性我们研究中造纸的沉淀的碳酸钙（PCC）。结果表明，当0.03％阳离子聚丙烯酰胺（CPAM）用作保留助剂时，使用琼脂的手抄贴的拉伸指数（基于PCC）改性PCC为填料高于天然PCC 29.5％，而填充潴留没有明显改变。光学显微镜观测和激光衍射粒度分析证实，在修饰后通过琼脂絮凝并涂覆PCC。机械强度和填料在不同填料含量的填料保留的特征表明手抄纸可以填充约10％的琼脂改性PCC，但保持相同的强度水平。

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