当前位置: X-MOL 学术Wood Sci. Technol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Fabrication and performance of in-depth hydrophobic wood modified by a silica/wax complex emulsion combined with thermal treatment
Wood Science and Technology ( IF 3.1 ) Pub Date : 2020-08-17 , DOI: 10.1007/s00226-020-01214-0
Zhangheng Wang , Weihua Zou , Delin Sun , Xiaoqin Ji , Minggong Yu

To improve the hydrophobicity of wood, utilizing a silica/wax composite emulsion (PPW@SiO2), which was prepared by maleic anhydride-grafted polypropylene wax (PPW) and nanosilica, served as a hydrophobic agent. The hydrophobicity modifying process of fast-growing poplar was carried out by heating permeation and hot pressing to prepare in-depth hydrophobic wood. The results show that the hydrophobic agent can fill the pores of poplar partly and form a two-dimensional, “petal-like”, rough hydrophobic structure in the pores. The water contact angle (WCA) on the surface of modified poplar can reach 140.3° when the amount of SiO2 is 1%. Even after surface grinding of 3 mm, the WCA is still higher than 130°, indicating the hydrophobic wood has a good performance of in-depth hydrophobicity. Furthermore, the surface of hydrophobic wood presents an exceptional self-cleaning function, and the physical and mechanical properties are also improved. Compared with a reference sample, the density, surface hardness, modulus of elasticity, compressive strength, and modulus of rupture of hydrophobic wood are increased by 66.67%, 53.16%, 55.60%, 49.50%, and 40.87%, respectively, and the water absorption in hydrophobic wood is also significantly decreased.

中文翻译:

二氧化硅/蜡复合乳液结合热处理改性深度疏水木材的制备与性能

为了提高木材的疏水性,利用由马来酸酐接枝聚丙烯蜡(PPW)和纳米二氧化硅制备的二氧化硅/蜡复合乳液(PPW@SiO2)作为疏水剂。速生杨树疏水改性工艺通过加热渗透和热压制备深疏水木材。结果表明,疏水剂可以部分填充杨树的孔隙,并在孔隙中形成二维、“花瓣状”的粗糙疏水结构。当SiO2含量为1%时,改性杨树表面的水接触角(WCA)可达140.3°。即使表面研磨3mm后,WCA仍高于130°,说明疏水木材具有良好的深度疏水性能。此外,疏水性木材表面呈现出超凡的自洁功能,物理机械性能也得到改善。与参比样品相比,疏水木材的密度、表面硬度、弹性模量、抗压强度和断裂模量分别增加了66.67%、53.16%、55.60%、49.50%和40.87%,水在疏水性木材中的吸收也显着降低。
更新日期:2020-08-17
down
wechat
bug