三聚氰胺-甲醛与木材的交联作用

Abstract

Abstract:

To study the mechanism of reaction between wood and crosslinking agent in compressed wood, lignin, holocellulose, cellulose, α-cellulose and hemicellulose were isolated from populus ussuriensis and reacted with melamine-formaldehyde.The distribution and reactivity of reacted chemicals in wood cell wall components were determined. The order of reactivity was found to be lignin > hemicellulose > holocellulose > α-cellulose > cellulose.The chemical construction of holocellulose, cellulose and lignin before and after crosslinking reaction were analysed.Using infrared(IR) spectra, thus the changes of main chemical groups of modificated wood were qualitatively determined.

Key words: Crosslinking reaction, Melamine-formaldehyde, Holocelluiose, Cellulose, Lignin

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Guizhen Fang,Jian Li,Yixing Liu,Jianwei Liu. CROSS—LINKING EFFECT BETWEEN WOOD AND MELAMINE-FORMALDEHYDE[J]. Scientia Silvae Sinicae, 1997, 33(3): 252-258.

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Figures/Tables 6

Fig.1

The Variation of N-content in the reaction between wood powder, the component of cell wall and melamine-formaldehyde"

Fig.1

Table 1

The comparis on between theoretical and experimental values in the reaction of Populus ussriensis wood and the component of cel wall and melanine-fomaldehyde"

Table 1

Fig.2

The Variation of weight increment in the reaction of wood powder, the component of cell wall and melamine-formaldehyde"

Fig.2

Fig.3

The time of deligninfication and the variation of lignin content of specimen treated with different periods of melamine-formaldehyde"

Fig.3

Fig.4

The relationship between the residual of Lignin and N-content of specimen treated by melamine-formaldehyde with different periods after deligninfication"

Fig.4

Table 2

The distribution of melamine-formaldehyde in the wood of Populus ussuriensis"

Table 2

References 4

1	Roger M. Rowell . Distribution of Reacted Chemicals in Southem Pine Modified with Methyl Isocyanate. Wood Science, 1980, 13 (2)
2	Inoue M , Morooka T , Norimoto M , Roger M. Rowell . Goro Egawa, Permanent fixation of Compressed Wood Ⅱ Mechanisms of Permanent Fixation. FRI Rulletin No. 176, 1992,
3	Yasuda R. , Minato K. . Chemical modification of wood by non-fomaldehyde. Cross-linking reagents. Wood Sci.Technol, 1994, 28 (3): 101- 110.
4	方桂珍, 刘一星. 木材横纹压密化处理的定型技术Ⅰ使用低分子三聚氰胺一甲醛树脂固定压密化木材的变形. 木材工业, 1996,

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