基于呼吸浸渍法硅酸钠强化杉木木材工艺优化

doi:10.11896/cldb.19090068

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Abstract Usingthe Chinese fir wood as the modified base material and sodium silicate as the impregnation modifier, alternately applying “negative pressure-positive pressure” to the wood to produce the form of “outlet-liquid inlet”, thereby improving the permeability of the wood as well as increasing the amount and efficiency of the modifier in the wood. Taking the modulus, concentration and immersion time of sodium silicate as test factors, the optimum conditions for soaking Chinese fir wood with sodium silicate were optimized by orthogonal experiment. The results showed that when the modulus of sodium silicate modifier was 3.4, the concentration was 30%, and the immersion time was 1 h, the wood impregnation effect was the best, the modified materials were characterized by FTIR, XRD and TGA analysis. The results showed that the number of free hydroxyl groups in the modified material of Chinese fir decreased, the number of associated hydroxyl groups increased, and the characteristic absorption peak of Si-O-Si appeared. The modification of Chinese fir by sodium silicate was not only physical filling, but also chemical bond combination. Because of the swelling effect of sodium silicate and the formation of chemical bonds, the crystallinity of modified Chinese fir decreased. The thermal stability of the modified fir material increased, the initial decomposition temperature became lower, the mass loss in the carbonization stage was significantly reduced, and the final residual mass increased.

Key words： Chinese fir wood sodium silicate respiratory impregnation method process optimization strengthen dimensional stability

Published: 12 September 2020

CLC number:

S781.7

Fund:This work was financially supported by the Major Science and Technology Program of Hunan Province (2017NK1010), Hunan Provincial Technical Innovation Platform and Talent Program in Science and Technology, PR China (2019RS2040), Key Laboratory of Bio-based Material Science & Technology (Northeast Fore-stry University) (SWZ-MS201917), Hunan Province Innovation Foundation for Postgraduate, PR China (CX20190600) and Science and Technology Innovation Project for Postgraduates of Central South Forestry University of Science and Technology, PR China (CX20191010, CX20192003).

About author:: Ya Zhoureceived her bachelor's degree in engineering from Central South University of Forestry and Technology in 2018. Her research interest is functional improvement of wood.
Yingfeng Zuoreceived his Ph.D. degree in enginee-ring from Northeast Forestry University in 2014. He is currently an associate professor in Central South University of Forestry and Technology. His research interests are modification of biomass composites and adhesives.

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	ZHOU Ya
	LI Ping
	ZHANG Yuan
	YUAN Guangming
	WANG Xiangjun
	WU Yiqiang
	ZUO Yingfeng

Cite this article:

ZHOU Ya,LI Ping,ZHANG Yuan, et al. Process Optimization of Sodium Silicate Reinforced Chinese Fir Wood Based on Respiratory Impregnation[J]. Materials Reports, 2020, 34(18): 18171-18176.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.19090068 OR http://www.mater-rep.com/EN/Y2020/V34/I18/18171

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