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| KH560改性聚乙烯醇的制备及其表面施胶性能研究 |
| Preparation and Surface Sizing Properties of KH560 Modified Polyvinyl Alcohol |
| 收稿日期：2022-05-22 |
| DOI：DOI：10.11980/j.issn.0254-508X.2022.12.008 |
| 关键词: 交联 KH560 聚乙烯醇 表面施胶 |
| Key Words:cross-linking KH560 polyvinyl alcohol surface sizing |
| 基金项目: |
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| 摘要:本研究利用硅烷偶联剂γ-缩水甘油醚丙基三甲氧基硅烷（KH560）分别对不同聚合度和醇解度的聚乙烯醇（PVA）进行接枝改性，探讨了其物理化学性能，以及利用其进行表面施胶对纸张物理性能的增强作用。结果表明，得益于存在的高活性硅羟基，其与纸张纤维羟基脱水缩合形成Si—O—C键，与羟基间氢键共同作用，形成三维交联网络，KH560-PVA1799具有优异的表面施胶性能。KH560-PVA1799施胶后纸张耐折度为232次，挺度为71.7 mN，撕裂指数为14.9 mN∙m2/g，接触角为63°，施胶度26 s，与未改性PVA施胶后的纸张相比，分别提高了112.8%、39.0%、90.2%、23.5%、136.3%。 |
| Abstract:The silane coupling agent γ-glycidyl ether propyl trimethoxysilane （KH560） was used to graft-modify polyvinyl alcohol （PVA） with different polymerization degrees and alcoholysis degrees， respectively. The physicochemical properties of PVA modified by KH560 and their enhancement effect on the physical properties of paper after surface sizing were discussed. The results showed that owing to the high activity of silanol groups， the Si—O—C bonds were linked with hydroxyl groups of paper fiber by dehydration and condensation， which were synergistic reacted with hydrogen bonds between hydroxyl groups and formed three-dimensional cross-linked network in KH560-PVA1799， so that it showed excellent surface sizing performance. The paper after surface sizing had folding endurance of 232 times， stiffness of 71.7 mN， tear index of 14.9 mN∙m2/g， contact angle of 63° and sizing degree of 26 s. Compared with the paper sizing with unmodified PVA， they were increased by 112.8%， 39.0%， 90.2%， 23.5% and 136.3%，respectively. |
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