改性玉米粉木质素乙二醛绿色木材胶粘剂的制备与性能

IF 1.3 Q2 MATERIALS SCIENCE, PAPER & WOOD
H. Younesi-Kordkheili, A. Pizzi
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引用次数: 0

摘要

以玉米粉为原料,通过酯化反应和多异氰酸酯预聚物交联,制备了玉米粉-木质素乙二醛(CLG)绿色木材胶粘剂。首先用马来酸酐对玉米粉进行酯化反应,加入10%多异氰酸酯,然后将改性后的玉米粉以不同含量(树脂固体含量为2%、4%和6%)加入酚化木质素和乙二醛溶液中,得到CLG树脂。根据FTIR光谱,1730cm-1处的酯基(-C=O)由于玉米粉与马来酸酐的酯化而增加。改性玉米粉的加入显著提高了CLG树脂的粘度和固含量,加快了树脂的凝胶化时间。DSC分析表明,改性玉米粉用量的增加使树脂的凝胶起始温度和固化温度不断降低。对玉米粉进行改性,可以获得CLG树脂粘接板材更大的机械强度和更高的尺寸稳定性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Preparation and properties of a modified corn flour-lignin-glyoxal as a Green wood adhesive
ABSTRACT A corn flour- lignin-glyoxal (CLG) green wood adhesive was prepared by esterification and polyisocyanate prepolymer crosslinking of corn flour. At first corn flour was esterified by maleic anhydride and 10% polyisocyanate was added to it. The modified corn flour was then added at various contents (2, 4 and 6% on resin solids) to phenolated lignin and glyoxal solution to obtain the CLG resin. According to the FTIR spectra, the ester groups (-C=O) at 1730 cm-1 increased due to the esterification of corn flour by maleic anhydride. The addition of the modified corn flour significantly increased the viscosity and solid content and accelerated the gelation time of CLG resins. DSC analysis indicated that increasing the modified corn flour continuously decreases the gel onset and curing temperatures of the resin. Greater mechanical strength and higher dimensional stability of panels bonded with CLG resins can be obtained by modification of corn flour.
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来源期刊
International Wood Products Journal
International Wood Products Journal MATERIALS SCIENCE, PAPER & WOOD-
CiteScore
2.40
自引率
0.00%
发文量
27
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