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林产化学与工业 ›› 2020, Vol. 40 ›› Issue (2): 93-98.doi: 10.3969/j.issn.0253-2417.2020.02.012

• 研究报告 • 上一篇    下一篇

疏水性木粉-SiO2气凝胶复合材料的制备及其性能研究

宋伟杉(),刘士瑞,赵雪,陈瑶*(),高建民   

  1. 木质材料科学与应用教育部重点实验室; 木材科学与工程北京市重点实验室; 北京林业大学, 北京 100083
  • 收稿日期:2019-10-21 出版日期:2020-04-28 发布日期:2020-04-27
  • 通讯作者: 陈瑶 E-mail:ssigot77@163.com;ychen@bjfu.edu.cn
  • 作者简介:宋伟杉(1996—),女,河南濮阳人,硕士生,主要从事复合材料研究; E-mail:ssigot77@163.com
  • 基金资助:
    北京市自然科学基金面上项目(6192020)

Preparation and Properties of Hydrophobic Wood Flour-silica Aerogel Composites

Weishan SONG(),Shirui LIU,Xue ZHAO,Yao CHEN*(),Jianmin GAO   

  1. MOE Key Laboratory of Wooden Materials Science and Application; Key Laboratory of Beijing for Wood Science and Engineering; Beijing Forestry University, Beijing 100083, China
  • Received:2019-10-21 Online:2020-04-28 Published:2020-04-27
  • Contact: Yao CHEN E-mail:ssigot77@163.com;ychen@bjfu.edu.cn

摘要:

以正硅酸乙酯(TEOS)和甲基三甲氧基硅烷(MTMS)为共前驱体,利用溶胶-凝胶法和常压干燥工艺制备疏水性木粉-SiO2气凝胶复合材料。探讨了不同粒径(0.42~0.84 mm、0.25~0.42 mm、0.18~0.25 mm)巴尔杉木木粉对木粉-SiO2气凝胶复合材料性能的影响,结果表明:木粉-SiO2气凝胶复合材料的密度、导热系数、抗压强度、接触角均随木粉粒径尺寸的减小而增大。木粉粒径为0.25~0.42 mm可获得性能较好的材料,复合材料密度为0.168 g/cm3,导热系数为0.033 7 W/(m·K),抗压强度为0.15 MPa,接触角为155.72°。制备的木粉-SiO2气凝胶复合材料具有保温性能优异、轻质高疏水的特性。

关键词: 木粉, SiO2气凝胶, 保温材料, 常压干燥, 轻质疏水

Abstract:

Hydrophobic wood flour-silica aerogel composites were prepared by sol-gel method and ambient pressure drying with tetraethyl orthosilicate (TEOS) and methyltrimethoxysilane (MTMS) as co-precursors. The effects of different particle sizes (0.42-0.84 mm, 0.25-0.42 mm, 0.18-0.25 mm) of balsa woodflour on the properties of wood flour-silica aerogel composites were studied. Through the analysis of thermal conductivity, contact angle, infrared spectrum, thermogravimetric and compressive strength of composite materials, it was observed that the density, thermal conductivity, compressive strength and contact angle of the composites decreased with the increase of particle size of the wood flour. Wood flour with the particle size of 0.25-0.42 mm could endow aerogel composite with better material properties. Namely, the composite density was 0.168 g/cm3, the thermal conductivity was 0.033 7 W/(m·K), the compressive strength was 0.15 MPa, and the contact angle was 155.72°. The prepared composite material has the characteristics of excellent heat preservation performance, light weight and high hydrophobicity.

Key words: wood flour, silica aerogel, insulation materials, ambient pressure drying, light hydrophobic

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