摘要
以杉木为改性基材、硅酸钠为浸渍改性剂,通过对木材交替施加“负压-正压”使其内部产生“呼液-吸液”的作用,从而改善木材的渗透性,并提高改性剂在木材中的浸注量以及浸渍效率。以硅酸钠的模数、浓度和浸渍时间作为试验因素,采用正交实验法优选出硅酸钠浸渍杉木的最佳工艺条件。研究结果表明,在硅酸钠改性剂的模数为3.4、浓度为30%、浸渍时间为1 h时,杉木木材的浸渍效果最佳。对最优条件的改性材进行FTIR、XRD、TGA分析表征。结果发现,杉木改性材的游离羟基数量减少,缔合羟基数量增加,出现Si-O-Si的特征吸收峰,说明硅酸钠对杉木的改性不只是物理填充,还存在化学键的结合;由于硅酸钠的润胀作用和化学键的形成,改性杉木的结晶度降低;杉木改性材的热稳定性提高,起始分解温度降低,在炭化阶段的质量损失显著减少,最终的残留质量增加。
Using the 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.
作者
周亚
李萍
张源
袁光明
王向军
吴义强
左迎峰
ZHOU Ya;LI Ping;ZHANG Yuan;YUAN Guangming;WANG Xiangjun;WU Yiqiang;ZUO Yingfeng(College of Materials Science and Engineering,Central South University of Forestry and Technology,Changsha 410004,China;Tianying(Guangdong)Wood Industry Technology Limited Company,Jiangmen 529700,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第18期18171-18176,共6页
Materials Reports
基金
湖南省科技重大专项(2017NK1010)
湖湘青年英才计划(2019RS2040)
生物质材料科学与技术教育部重点实验室(东北林业大学)开放基金(SWZ-MS201917)
湖南省研究生科研创新项目(CX20190600)
中南林业科技大学研究生科研创新项目(CX20191010
CX20192003)。
关键词
杉木
硅酸钠
呼吸浸渍法
工艺优化
强化
尺寸稳定化
Chinese fir wood
sodium silicate
respiratory impregnation method
process optimization
strengthen
dimensional stability
作者简介
左迎峰,中南林业科技大学,副教授。2014年毕业于东北林业大学,获工学博士学位。同年加入中南林业科技大学材料科学与工程学院工作,主要从事生物质复合材料及胶黏剂改性研究,zuoyf1986@163.com;周亚,中南林业科技大学,硕士研究生。2018年毕业于中南林业科技大学,获得工学学士学位。主要从事木材功能性改良。
