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| Discussion on the Mechanism of Improving Waterproof Property of Paper by Surface Sizing of Sodium Silicate |
| Received:April 17, 2019 |
| DOI：10.11981/j.issn.1000-6842.2020.02.36 |
| Key Words:surface sizing;porosity;aperture;contact angle |
| Author Name | Affiliation | E-mail | | PENG Pengjie* | Pingxiang Product Quality Supervision and Inspection Institute, Pingxiang, Jiangxi Province, 337000 | 624130898@qq.com | | ZHOU Xiaofan | Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing, Jiangsu Province, 210037 | | | OUYANG Kaitong | Pingxiang Product Quality Supervision and Inspection Institute, Pingxiang, Jiangxi Province, 337000 | | | LI Hao | Pingxiang Product Quality Supervision and Inspection Institute, Pingxiang, Jiangxi Province, 337000 | |
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| Abstract: |
| Sodium silicate,sodium silicate and starch mixture were respectively used for paper surface sizing in this study. The paper porosity, aperture, surface smoothness,Cobb30, and contact angle were used to characterize the paper’s porous structure and surface wettability after surface sizing, and according to the capillary phenomenon formula, the paper waterproof mechanism was discussed and analyzed. The structure and morphology of paper surface after surface sizing were also analyzed by SEM. The results showed that the optimal dosage of starch in sodium silicate-starch compound was 33%. With the increment of surface sizing, the porosity and average aperture of surface-sized paper decreased, and the contact angles of surface-sized papers were greater compared with the base paper, and the sodium silicate-starch performed better than the sodium silicate in improving water resistance of paper. In addition, the study also found that reduction of average aperture, increase of the surface contact angle, and the glue film produced by surface sizing in/on the paper are main reasons for water resistance of paper sized with sodium silicate and sodium silicate-starch compound. |
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