期刊论文

中文

中南林业科技大学学报

1673-923X

2017

37

12

153-158

10.14067/j.cnki.1673-923x.2017.12.024

十二五国家科技支撑计划课题“人工林软质木材增强制造关键技术与示范”(2015BAD14B01) 湖南省科技计划专项“重要用材树种高效培育及利用技术研究与示范”(2016NK2160)

本校为第一机构

本研究以脲醛(UF)树脂改性杉木为研究对象,采用高温过热蒸汽对其进行热处理,系统研究了热处理温度和时间对UF树脂改性杉木力学强度的影响规律。结果表明:与杉木对照材相比,UF树脂改性杉木力学强度显著提高;高温热处理使杉木浸渍材的力学强度降低;随着温度升高和时间延长,杉木浸渍材的抗弯弹性模量和强度、顺纹抗压强度和横纹抗压比例极限应力均呈明显下降趋势;经热处理后,UF改性杉木抗弯弹性模量、抗弯强度、顺纹抗压强度最大分别可降低11.4%、65.1%和17.3%,横纹全部弦向和径向抗压比例极限应力最大分别可降低60.9%和59.6%,横纹局部弦向和径向抗压比例极限应力最大分别可降低36.5%和56.5%。

The UF resin modified Chinese fir was treated in the high temperature superheated steam to investigate the effects of temperature and processing time on wood properties.The results show that the mechanical properties of the Chinese fir were improved after UF resin impregnation.The mechanical properties of the UF resin modified Chinese fir decreased after high-temperature heat treatment.With the increase of temperature and the extension of time,the bending MOE,MOR,the compressive strength to the grain and stress at proportional limit perpendicul...