Effect of Microwave-Urea Synergistic Treatment on the Dimensional Stability and Bending Properties of Compresseion-Densified Wood

LI Siyi; WANG Zhichuang; WANG Tinghuan; YU Hui; WANG Zi; HE Zhengbin; WANG Zhenyu; YI Songlin

doi:10.12326/j.2096-9694.2025138

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Effect of Microwave-Urea Synergistic Treatment on the Dimensional Stability and Bending Properties of Compresseion-Densified Wood
State Key Laboratory of Efficient Production of Forest Resources，Beijing Key Laboratory of Wood Science and Engineering， Key Laboratory of Wooden Material Science and Application of Ministry of Education，School of Material Science and Technology， Beijing Forestry University，Beijing 100083，China
Vol. 40, Issue 2, Pages: 49-57(2026)
DOI： 10.12326/j.2096-9694.2025138
稿件说明：

移动端阅览

李思仪,王志闯,王婷欢等.微波-尿素协同处理对压缩密实化木材尺寸稳定性及抗弯性能的影响[J].木材科学与技术,2026,40(02):49-57. DOI： 10.12326/j.2096-9694.2025138.

LI Siyi,WANG Zhichuang,WANG Tinghuan,et al.Effect of Microwave-Urea Synergistic Treatment on the Dimensional Stability and Bending Properties of Compresseion-Densified Wood[J].Chinese Journal of Wood Science and Technology,2026,40(02):49-57. DOI： 10.12326/j.2096-9694.2025138.

摘要

以毛泡桐（

Paulownia tomentosa

）木材

为研究对象，首先采用微波预处理，然后经尿素溶液（质量分数为30%）软化后热压制备压缩密实化木材（简称为压缩木材），主要探究不同微波预处理时间对压缩木材尺寸稳定性及抗弯性能的影响。结果表明，当热压温度为170 ℃时，随着微波预处理时间的延长，木材增重率和密度均显著增加（

0.01），与未处理材相比，分别提高了7.42%~136.13%和10.71%~39.29%，剖面密度分布趋于均匀。微波-尿素协同处理对压缩木材的尺寸稳定性具有显著作用（

0.01），当微波预处理时间为10~50 s时，压缩木材的吸水回复率、湿胀率较对照组（仅热压处理的木材）分别降低44.95%~60.81%、31.08%~50.00%。压缩木材的抗弯强度和弹性模量均随微波预处理时间的延长呈先增加后降低的趋势，在微波预处理时间为40 s（临界时间）时达到最大，较未处理材分别提升了45.45%和37.62%（

0.05）。微波-尿素协同处理发挥了二者的作用：微波处理引发木材内部膨化，使尿素溶液充分渗透到木材细胞壁中，在热压过程中尿素发挥软化作用，并与细胞壁发生交联反应，从而有效降低压缩木材的变形回复率并提升其抗弯性能。研究结果为高稳定性压缩木材的制备与应用提供理论基础。

Abstract

This study investigated the effect of microwave pretreatment time on the dimensional stability and bending properties of compression-densified wood (referred as densified wood).

Paulownia tomentosa

was pretreatment by microwave

then softened by urea solution (mass fraction of 30%)

and followed by hot-pressing to produce densified wood. The results showed that when the hot pressing temperature was 170 ℃

the weight percent gain and density of densified wood significantly increased (

0.01) with the extension of microwave pretreatment time. Compared with untreated wood

these two indexes were increased by 7.42%~136.13% and 10.71%~39.29%

respectively

with the density profile becoming relatively uniform. Microwave urea synergistic treatment significantly improved the dimensional stability of densified wood (

0.01). When the microwave pretreatment time was 10~50 s

the set recovery rate and swelling efficiency were decreased by 44.95%~60.81% and 31.08%~50.00%

respectively

compared with control group (treated only by hot-pressing). Both bending strength and modulus of elasticity of densified wood were initially increased and then decreased with the extension of microwave pretreatment time

reaching their maximum at a microwave pretreatment time of 40 seconds (critical time)

which increased by 45.45% and 37

.62%

respectively

compared with untreated wood (

0.05). The combined effect of microwave-urea was demonstrated

i.e.

microwave treatment induced puffing within the wood

allowing the urea solution to fully penetrate the wood cell walls. During hot-pressing

urea softened and crosslinked with the cell walls

effectively reducing the set recovery rate of densified wood and improving its bending performance. The research results could provide a theoretical basis for the preparation and application of high-performance densified wood.

关键词

Keywords

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