Research Progress of Reinforced Modification of Fast-Growing Wood

Zhang, Zhaohong; Guo, Qiang; Huang, Xuanxuan; Zhang, Qian; Fan, Jinlong; Huang, Jintian

doi:10.3390/coatings14010053

Cited by 7 publications

(6 citation statements)

References 21 publications

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“…The physical and mechanical properties were the best when the compression rate was 33%. Compared with ordinary Chinese fir, the den-sity increased from 0.35 g/cm 3 to 0.58 g/cm 3 , and the surface hardness increased from 37.9 HD to 70.9 HD. The static bending strength increased from 73.4 MPa to 98.7 MPa, the elastic modulus increased from 8640.7 MPa to 11,498 MPa, and the compressive rebound rate was 3.97% after aging for 30 days.…”

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confidence: 90%

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Study on Phenol–Formaldehyde Resin–Montmorillonite Impregnation and Compression Modification of Chinese Fir

He,

Zhang,

Zhang

et al. 2024

Polymers

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In this study, a phenol–formaldehyde resin–montmorillonite intercalation composite solution was used as a modifier to treat Chinese fir via impregnation and compression. The basic characteristics and wettability of the PF (phenol–formaldehyde)–montmorillonite impregnation solution were analyzed. The effects of the solid content of PF, the quantity of montmorillonite, and the impregnation time on the impregnation weight gain of Chinese fir were studied through orthogonal experiments. The results showed that when the amount of montmorillonite was 1%, the wettability of the PF–montmorillonite impregnation solution performed the best, the curing time was short, and the curing strength was high. The optimal impregnation process consists of a PF solid content of 25%, an impregnation time of 120 min, and a montmorillonite ratio of 1%. Under these conditions, the modified Chinese fir was prepared via hot pressing. The effects of the addition of montmorillonite and different levels of compressibility on the physical and mechanical properties of modified wood were studied. The physical and mechanical properties were found to be better when the compression ratio was 33%: the density increased from 0.33 g/cm3 to 0.58 g/cm3; the surface hardness increased from 33.6 HD to 70.9 HD; the static bending strength increased from 60.4 MPa to 98.7 MPa; and the elastic modulus increased from 6 390 MPa to 11 498 MPa. After 30 days of release, the compression rebound rate was 3.97%. Meanwhile, the micromorphology and heat resistance of the impregnated compressed Chinese fir showed that the PF–montmorillonite impregnation solution entered into the cell cavity and intercellular space of the Chinese fir and formed a good composite, thus improving the water resistance, heat resistance, and physical and mechanical properties.

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confidence: 90%

“…Many wood species have long growth cycles, so fast-growing wood is favored by factories. In order to improve the properties of fast-growing wood and make up for its natural deficiencies, wood modification has become a major research focus [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Study on Phenol–Formaldehyde Resin–Montmorillonite Impregnation and Compression Modification of Chinese Fir

He,

Zhang,

Zhang

et al. 2024

Polymers

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“…However, natural wood has some undesirable properties, such as the ammability and hygroscopicity of fast-growing poplar. Flammability leads to potential re hazards when used indoors and outdoors, which also severely limits its application (Sadeghifar et al 2015;Zhang et al 2023;Yun et al 2014). According to 2021 statistics, there were approximately 750,000 res in China, causing a total of 6.8 billion yuan in direct property losses (Xuan 2022).…”

Section: Introductionmentioning

confidence: 99%

Preparation of multifunctional flame retardant composite wood by doping poplar cell walls with metal phytates

Shen,

Liu,

Wang

et al. 2024

Preprint

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Phytic acid as an efficient, green and renewable bio-based flame retardant. However, in view of the large number of toxic fumes generated during combustion and the easy loss of flame retardants, to tackle these issues, the current study employed a straightforward two-step process to generate phytate metal salt wood composites (PAN-M, M = Mg, Cu, Fe, Ai and Ni) in cell walls. Compared with natural wood (Control), PAN-M has good leaching resistance of 15 ~ 50 %, lower hygroscopicity of 15 ~ 30 % and improved mechanical strength. The total heat release and smoke emission of PAN-Cu are reduced by 34.54 % and 83.05 % respectively, the LOI of PAN-Cu is increased by 117 %, the smoke density SDR is only 8.38 and the weight gain is 16.9 %. This is mainly due to the apparent surface coke protection of metal phytates and catalytic graphitisation of solid residues by metal ions. The improved carbon layer plays an effective insulating role, limiting flue gas emissions, flame retardant loss and water contact. In addition, results show that PAN-Cu can significantly enhance the dehydration effect of carbon compared to other metal ions. Therefore, PAN-M is therefore an efficient, green and sustainable flame retardant for wood.

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“…Softening methods are mainly divided into physical and chemical methods. The former mainly includes boiling (Matsuo-Ueda et al, 2023;Zhang et al, 2023), steaming (Cao et al, 2023;Yao et al, 2023), microwave (Norimoto, 1979;Norimoto et al, 1980;Norimoto and Gril, 1989;Ganguly et al, 2021;Mascarenhas FJR. et al, 2023;Mascarenhas F. et al, 2023;Mascarenhas et al, 2024), and high-frequency heating methods (Norimoto and Gril, 1989).…”

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confidence: 99%

Effects of hydrothermal–microwave treatment on bending properties of teak in plantation

Huang,

Shen,

Zhang

et al. 2024

Front. Mater.

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In order to study the bending properties of tropical tree species rich in organic extracts, the effects of temperature and time on the bending performance of hydrothermal treatment were investigated. The effects of power and time on bending performance under microwave heating conditions were investigated. It is found that the chemical composition does not undergo obvious degradation at 80°C–100°C, and the bending performance gradually becomes better with the increase in heating time; when the hydrothermal time exceeds 4 h, the bending performance varies with heating time. The growth is better than the difference, reaching the maximum at 4 h. When the water temperature is 140°C, the bending performance is negatively correlated with the heating time. When the hydrothermal treatment time is the same, the bending property becomes better as the temperature increases. The most reasonable process for microwave softening heating is with a power of 480 W and a heating time of 4 min. A softening treatment method combining water heat and microwave can achieve a better softening effect. When the final moisture content is controlled to 8%, the bending setting effect is the best. The optimum drying time is 6 h, and the optimum drying temperature is 50°C.

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Research Progress of Reinforced Modification of Fast-Growing Wood

Cited by 7 publications

References 21 publications

Study on Phenol–Formaldehyde Resin–Montmorillonite Impregnation and Compression Modification of Chinese Fir

Study on Phenol–Formaldehyde Resin–Montmorillonite Impregnation and Compression Modification of Chinese Fir

Preparation of multifunctional flame retardant composite wood by doping poplar cell walls with metal phytates

Effects of hydrothermal–microwave treatment on bending properties of teak in plantation

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