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DCS controlling and paper strengthening effects of highly cationic starches with different branching degrees and molecular weights

机译：不同支化度和分子量的高阳离子淀粉的DCS控制和纸张增强效果

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摘要

Normal starch, fully linear starch (amylase) and fully branched starch (amylopectin) were used in preparing highly cationic starches (HCSs) and the products were degraded by acid hydrolysis so that HCSs with different branching degrees and molecular weights were obtained. The dissolved and colloidal substances (DCS) controlling effects of these HCSs were investigated after adding them into a deinked pulp. Results showed that compared with the un-degraded HCSs, the degraded ones can neutralize pulp fibres more easily with less adsorbed amounts, leaving more degraded HCSs to remove the anionic dissolved and colloidal substances better in the pulp. With respect to the strengthening effects, it was discovered that tensile index can be maintained by the degraded normal and linear HCSs, and increased by the degraded branched HCSs; burst index was changed very little; folding number was decreased very slightly and tearing index was decreased to some extent by the degraded normal and linear HCSs, but these two properties can be maintained by the un-degraded branched HCSs. The study indicated that the degraded linear HCS had better performance in controlling microstick-ies, while the degraded branched HCS had better performance in paper strengthening.
机译：用普通淀粉，全线性淀粉（淀粉酶）和全支链淀粉（支链淀粉）制备高阳离子淀粉（HCSs），产物经酸水解降解，得到支化度和分子量不同的HCS。在将这些HCS加入脱墨纸浆后，对它们的溶解和胶体物质（DCS）控制效果进行了研究。结果表明，与未降解的HCS相比，降解的HCS可以更容易地中和纸浆纤维，吸附量更少，而残留的HCS则更多，可以更好地去除纸浆中的阴离子溶解和胶体物质。关于增强效果，发现拉伸指数可以通过降解的普通和线性HCS来保持，而可以通过降解的支链HCS来增加；爆发指数变化很小；正常和线性HCS的降解会使折叠数略有降低，并且撕裂指数有所降低，但是这两种性质可以通过未降解的支链HCS保持。研究表明，降解的线性HCS在控制微胶粘方面具有更好的性能，而降解的支链HCS在纸张增强方面具有更好的性能。

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