| 摘要: |
| 【目的】分析木纤维用量对木纤维/气相SiO2复合真空绝热板（vacuum insulation panel，VIP）性能的影响，为复合VIP的制备提供支持。【方法】采用中密度纤维板生产过程中所使用的木纤维与气相SiO2进行复合，通过模压成型法制成木纤维/气相SiO2多尺度结构复合芯材，并将其真空封装制备木纤维/气相SiO2复合真空绝热板 (VIP)。通过场发射扫描电子显微镜（SEM）、压汞仪和傅里叶红外光谱分析仪（FTIR），研究不同木纤维用量对复合VIP芯材的微观形貌、孔隙结构和辐射导热的影响，并利用热流法导热仪测试了复合VIP在不同环境温度下的导热系数。【结果】大部分的木纤维空隙、纹孔内都填充满了气相SiO2纳米级粉末，并且搭建起由木纤维和SiO2构建的三维空间结构网络；当木纤维质量分数为40%时，VIP的总孔体积为4.61 cm3/g，孔隙率为60.6%，平均孔径为0.13 μm；当环境温度为25 ℃时，VIP辐射导热系数为0.60 mW/(m·K)，总导热系数为6.58 mW/(m·K)，而当环境温度升至55 ℃时，总导热系数为7.21 mW/(m·K)，相比于未添加木纤维的气相SiO2芯材，综合性能成本降低了28.7%。【结论】利用木纤维替代部分气相SiO2制备复合VIP能够大大降低芯材成本，并且还能保持良好的隔热性能，具有十分广泛的应用前景。 |
| 关键词: 木纤维 气相SiO2 真空绝热板 孔隙结构 导热系数 |
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| 基金项目:福建省产业技术联合创新项目“纳米重组木纤维真空绝热板的研发与产业化”（119k-6015001A）；福建省科技计划（区域发展）项目“高强度轻质纤维板产业化开发”（2017N3009）；福建农林大学科技创新专项基金项目“木纤维基保温材料的制备及其性能研究”（KFA17554A） |
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| Preparation and characterization of wood fiber/fumed silica vacuum insulation panel |
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WANG Baowen,LI Zhihui,QI Xinglai,et al
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| Abstract: |
| 【Objective】The effect of wood fiber content on properties of wood fiber/fumed silica composite vacuum insulation panel (VIP) was analyzed to provide support for the preparation of composite VIP.【Method】The effects of different wood fiber content on microstructure,pore structure and radiative conductivity of composite VIP core were investigated by SEM,mercury porosimetry and FTIR.The thermal conductivity of composite VIP at different ambient temperatures was tested by the heat flow meter.【Result】 Most of the wood fiber voids and pits were filled with fumed silica nanoscale powder,and the three dimensional spatial structure network constructed by wood fiber and fumed silica was built.When the mass fraction of wood fiber was 40%,the total pore volume,porosity and average pore size of the VIP were 4.61 cm3/g,60.6% and 0.13 μm,respectively.When the ambient temperature was 25 ℃ the radiative thermal conductivity of vacuum insulation panel was 0.60 mW/(m·K) and the total thermal conductivity was 6.58 mW/(m·K).When the environment temperature was 55 ℃,the total thermal conductivity was 7.21 mW/(m·K).Compared with the fumed silica core material without wood fiber,the comprehensive performance cost was reduced by 28.7%.【Conclusion】The use of wood fiber instead of partial fumed silica to prepare composite VIP can greatly reduce the cost of core material while maintain good insulation performance,which has very wide application prospect. |
| Key words: wood fiber fumed silica vacuum insulation panel pore structure thermal conductivity |
