三聚氰胺-尿素-乙二醛树脂浸渍改性对人工林红锥木材物理力学性能的影响

doi:10.11707/j.1001-7488.LYKX20230582

Abstract

Abstract:

Objective: In this paper, impregnation modification utilizing melamine-urea-glyoxal (MUG) resin is proposed to improve the cracking defect of plantation grown Castanopsis hystrix wood and increase its value. Method: MUG resin with different mass fractions (10%, 15%, 20%, and 25%) was used to modify plantation C. hystrix wood (denoted as MUG10, MUG15, MUG20, MUG25). The changes in wood's physical and mechanical properties before and after modification were analyzed. The changes in pore structures were also investigated through nitrogen adsorption, mercury intrusion, and scanning electron microscopy methods. Result: The results showed that the dimensional stability and mechanical properties of resin-impregnated wood were significantly improved with the increasing mass fraction of MUG resin. When the mass fraction of MUG was 25%, the WPG (weight percent gain) of resin-impregnated wood was 21.1%, oven-dried density was 762 kg·m^?3, and the difference between the oven-dried density of earlywood and latewood was 42.0%, which was lower than that of untreated wood. The ASE (anti swelling efficiency) of tangential, radial, and volume of the resin-impregnated wood (MUG25) were 52.06%, 39.96%, and 44.30%, respectively. And the ratio of radial and tangential wet swelling was 0.70 indicating the anisotropy of modified wood decreased. Compared with the untreated wood, the modulus of elasticity (MOE), modulus of rupture (MOR), and compressive strength (CS) of resin-impregnated wood (MUG25) were increased by 35.59%, 30.01%, and 32.78%, respectively, and the hardness of radial section, tangential section, and cross section were increased by 37.13%, 13.46%, and 27.94%, respectively. Furthermore, the porosity of the resin-impregnated wood decreased and the pores such as wood vessels, fibers, and pits in wood cell were filled with resins. Conclusion: MUG resin-impregnated modification can effectively improve the dimensional stability of C. hystrix wood and expand its application scope.

Key words: Castanopsis hystrix wood, melamine-urea-glyoxal (MUG) resin, dimensional stability, mechanical properties, porosity

CLC Number:

S781.7

Yan Chen,Surong Meng,Anmin Huang,Yingying Su,Bailing Sun. The Influence of Melamine-Urea-Glyoxal (MUG) Resin Impregnation Modification on the Physical and Mechanical Properties of Castanopsis hystrix Wood[J]. Scientia Silvae Sinicae, 2025, 61(1): 166-175.

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测试项目Test item	试件尺寸Sample size	样本数Sample number per group
增重率Weight percent gain (WPG)	20 mm (R)×20 mm (T)×20 mm (L)	20
增容率Bulking effect (BE)	20 mm (R)×20 mm (T)×20 mm (L)	20
绝干密度Oven-dried density	20 mm (R)×20 mm (T)×20 mm (L)	20
尺寸稳定性Dimensional stability	20 mm (R)×20 mm (T)×20 mm (L)	20
剖面密度Profile density	20 mm (R)×50 mm (T)×50 mm (L)	9
抗弯弹性模量Modulus of elasticity (MOE)	20 mm (R)×20 mm (T)×300 mm (L)	20
抗弯强度Modulus of rupture (MOR)	20 mm (R)×20 mm (T)×300 mm (L)	20
顺纹抗压强度Compressive strength parallel to grain (CS)	20 mm (R)×20 mm (T)×30 mm (L)	20
硬度Static hardness (SH)	50 mm (R)×50 mm (T)×70 mm (L)	6
氮气吸附测试Nitrogen adsorption	1 mm (R)×1 mm (T)×5 mm (L)	3
压汞测试Mercury intrusion	10 mm (R)×10 mm (T)×12 mm (L)	3
扫描电镜Scanning electron microscope (SEM)	5 mm (R)×5 mm (T)×5 mm (L)	3

处理 Treatment	增重率Weight percent gain (WPG)			增容率Bulking effect (BE)
处理 Treatment	平均值 Mean (%)	标准差 Standard deviation (%)	变异系数 Coefficient of variation (%)	平均值 Mean (%)	标准差 Standard deviation (%)	变异系数 Coefficient of variation (%)
MUG10	9.3	1.0	10.2	2.24	0.84	37.72
MUG15	14.1	0.6	4.5	3.15	0.78	24.83
MUG20	19.6	1.5	7.7	4.10	0.77	18.67
MUG25	21.1	0.9	4.2	4.85	0.81	16.76

处理 Treatment	绝干密度Oven-dried density			剖面密度平均值Average value of the profile density
处理 Treatment	平均值 Mean/(kg·m^?3)	标准差 Standard deviation(kg·m^?3)	变异系数 Coefficient of variation (%)	平均值 Mean/(kg·m^?3)	标准差 Standard deviation/(kg·m^?3)	变异系数 Coefficient of variation (%)
UW	654	29	4.6	672	20	2.9
MUG10	701	26	3.7	712	11	1.6
MUG15	726	21	2.8	720	21	3.0
MUG20	750	24	3.2	733	8	1.2
MUG25	762	22	2.8	755	6	0.8

处理 Treatment	压入汞的总体积 Total intrusion volume/(mL·g^?1)	平均孔径 Average pore diameter/nm	孔隙率 Porosity (%)
UW	0.755 7	69.74	51.797 3
MUG25	0.574 1	31.81	45.071 7

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The Influence of Melamine-Urea-Glyoxal (MUG) Resin Impregnation Modification on the Physical and Mechanical Properties of Castanopsis hystrix Wood

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