Effect of Melamine-Urea-Formaldehyde Resin Impregnation on Compressive Energy Absorption Properties of Chinese Fir Wood

XU Shiyu; HU Jihang; KONG Jing; YANG Zhiyi; LYU Wenhua

doi:10.12326/j.2096-9694.2023178

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Effect of Melamine-Urea-Formaldehyde Resin Impregnation on Compressive Energy Absorption Properties of Chinese Fir Wood
Research Institute of Wood Industry，Chinese Academy of Forestry，Beijing 100091，China
Vol. 38, Issue 3, Pages: 33-39(2024)
DOI： 10.12326/j.2096-9694.2023178
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徐诗雨,胡极航,孔静等.三聚氰胺-尿素-甲醛树脂浸渍改性对杉木压缩吸能特性的影响[J].木材科学与技术,2024,38(03):33-39. DOI： 10.12326/j.2096-9694.2023178.

XU Shiyu,HU Jihang,KONG Jing,et al.Effect of Melamine-Urea-Formaldehyde Resin Impregnation on Compressive Energy Absorption Properties of Chinese Fir Wood[J].Chinese Journal of Wood Science and Technology,2024,38(03):33-39. DOI： 10.12326/j.2096-9694.2023178.

摘要

采用质量分数为8%的三聚氰胺-尿素-甲醛（melamine-urea-formaldehyde resin，MUF）树脂溶液浸渍处理杉木（

Cunninghamia lanceolata

），通过准静态大变形压缩测试，考察杉木改性前后的压缩破坏模式、力学性能和压缩吸能特性等。结果表明：在改性材增重率为33.22%时，抗湿胀率达64.44%，尺寸稳定性得到改善；改性处理未影响杉木的压缩破坏形态，纵向主要为纤维屈曲和撕裂，径向主要为早晚材逐层压溃破坏，弦向主要呈火柴棍状破坏；改性材弹性模量和破坏强度提高，横纹平台应力显著增大，顺纹平台应力略有降低，致密化应变减小，纵向和横向之间的差异减小；改性材径向和弦向的单位体积吸能值分别增加了30%和17%，顺纹压缩吸能值及最大吸能效率则显著降低。低质量分数的MUF树脂浸渍处理可改善杉木的尺寸稳定性，缩小其纵向和横向之间的能量吸收差异。

Abstract

In this study

Chinese fir wood was impregnated with melamine-urea-formaldehyde (MUF) resin solution with an 8% ratio

and then the quasi-static large deformation compression tests were conducted to investigate its compressive failure modes

mechanical properties

and energy absorption performance. The results were as follows: The weight percent gain of the modified wood reached 33.22%

and its anti-swelling efficiency attained 64.44%

indicating improved dimensional stability. The modification had no significant effect on the wood compression failure modes. The longitudinal failure mainly involved fiber buckling and tearing

the radial failure mainly involved layer-by-layer crushing of earlywood and latewood

while the tangential compressed wood was mostly matchstick damage. The compressive modulus of elasticity and crushing strength in modified specimen increased. Their plane stresses risen greatly in the transverse compression but decreased slightly in the longitudinal compression

and their densification strains decreased. The difference in compressive mechanical properties between longitudinal and transverse directions was reduced. The energy absorption per unit volume in the radial and tangential directions of the modified wood increased by 30% and 17% respectively

owever

both the longitudinal compression energy absorption and the maximum energy absorption efficiency decreased significantly. Low mass fraction MUF resin modification can significantly improve the dimensional stability of Chinese fir wood and reduce its energy absorption differences between longitudinal and transverse compression.

关键词

Keywords

references

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