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| The Application of Chitosan Modified Gypsum Whisker in Papermaking |
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| DOI：10.11980/j.issn.0254-508X.2016.07.005 |
| Key Words:gypsum whiskers chitosan modification solubility paper |
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| Abstract:To improve the performance of gypsum whiskers in papermaking, chitosan coated gypsum whiskers aiming to reduce its solubility in aqueous solution effectively were prepared. The influences of the content of chitosan, reaction pH were explored. The chitosan-gypsum whiskers were characterized by SEM, XRD, XPS. The mechanism of the modification was studied. The results showed that the best modification conditions were: 0.5% chitosan, sol pH 5.5, gel pH 7.5, the solubility of chitosan-gypsum whiskers reduced from 14.0% to 5.6% under the conditions. SEM, XRD and XPS results showed that, chitosan covered the furface of gypsum whiskers effectively, and the cover thickness of chitosan is 9.8 nm. Cobber number, filler retention and tensile strength of handsheet with modified gypsum whiskers increased by 15.3%, 15.1% and 5.6% compared to that of unmodified gypsum whisker. |
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