目的 制备椰油酰胺丙基甜菜碱（CAB）改性蒙脱土（OMMT）和改性六方氮化硼（M-h-BN）与聚乙烯醇（PVA）混合后的涂布液,研究二维纳米填料种类和比例对复合涂布液性能的影响规律。方法 利用X射线衍射仪、傅里叶红外分光光度计、扫描电子显微镜等现代分析手段对二维填料、复合涂布液及涂布纸进行表征与性能测试。结果 MMT和h-BN改性后,其层间距增大,得到的OMMT和M-h-BN在PVA溶液中分散性良好。涂布纸的拉伸强度和断裂伸长率随填料含量的增加,呈现先上升后下降的趋势。当OMMT/M-h-BN复合填料质量分数为4%时,涂布纸的拉伸强度和断裂伸长率最大为35.35 MPa、108.03%。质量分数为4% OMMT/M-h-BN/PVA涂布纸的24 h水蒸气透过率仅为22 g/（m2·d）,较纯PVA降低63%。OMMT/M-h-BN/PVA涂布纸的吸湿和放湿率分别稳定在3.77%和2.71%,较纯PVA分别降低48%和54.5%。结论 适当的OMMT和M-h-BN添加量可以显著提升涂布纸的拉伸强度、断裂伸长率和阻湿性能,同时复合填料由于OMMT与M-h-BN的协同作用,相比单一填料能更有效地提升涂布纸的综合性能。
Abstract
The work aims to prepare a coating solution of modified montmorillonite (OMMT) and modified hexagonal boron nitride (M-h-BN) mixed with polyvinyl alcohol (PVA) using cocoamidopropyl betaine (CAB), and to investigate the influence of two-dimensional nanofiller types and ratios on properties of the composite coating solution. Modern analytical techniques such as X-ray diffractometer, Fourier transform infrared spectrophotometer, and scanning electron microscope were used to characterize and test the properties of two-dimensional filler, composite coating solution, and coated paper. After modification with MMT and h-BN, the interlayer spacing increased, and the resulting OMMT and M-h-BN exhibited good dispersibility in PVA solution. The tensile strength and elongation at break of coated paper showed a trend of first increasing and then decreasing with the increase of filler content. When the content of OMMT/M-h-BN composite filler was 4 wt.%, the maximum tensile strength and elongation at break of the coated paper were 35.35 MPa and 108.03%. The 24 h moisture permeability of 4 wt.% OMMT/M-h-BN/PVA coated paper was only 22 g/(m2·d), which was 63% lower than that of pure PVA. The moisture absorption and release rates of OMMT/ M-h-BN/PVA coated paper remained stable at 3.77% and 2.71%, respectively, while they were 48% and 54.5% lower than those of pure PVA. In conclusion, the appropriate addition of OMMT and M-h-BN can significantly improve the tensile strength, elongation at break, and moisture resistance of coated paper. At the same time, composite filler, due to the synergistic effect of OMMT and M-h-BN, can more effectively enhance the comprehensive performance of coated paper compared with single filler.
关键词
椰油酰胺丙基甜菜碱 /
有机蒙脱土 /
六方氮化硼 /
复合填料
Key words
cocoamide propyl betaine /
organic montmorillonite /
hexagonal boron nitride /
composite filler
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基金
陕西中烟工业有限责任公司委托项目（2023610000340444）
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