Preparation and properties of walnut cake-based wood adhesive with oxidation modification

IF 2.2 4区农林科学 Q2 MATERIALS SCIENCE, PAPER & WOOD

Bioresources Pub Date : 2024-06-27 DOI:10.15376/biores.19.3.5497-5510

Wen Gu, Yuan Qiang Tu, Shuangshuang Yuan, Danyun Yu, Guifen Yang, Feiyan Gong, Shuang Yin, Zhigang Wu, Hongyan Wang

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引用次数: 1

Abstract

Walnut cake has the potential for use in preparing wood adhesives because of its richness in protein and carbohydrate. In this work, walnut cakes were treated with sodium periodate or potassium permanganate and then were directly used as wood adhesives. Their bonding properties, curing performances, thermal properties, and chemical structures were compared. The results showed that: (1) The oxidation by KMnO4was non-selective. The reaction was very intense, accompanied by the great variability of oxidation degree and degradation degree, enormous viscosity of oxidation products, high coating difficulty, and low content of active aldehyde groups. (2) The oxidation by NaIO4 was selective; the reaction was mild and easy to control. More active aldehydes could be produced and the treatment was beneficial for constructing a spatial net structure of the adhesive. (3) Compared with oxidation of KMnO4, the walnut cake adhesive prepared by NaIO4 oxidation exhibited a more compact structure, a higher crosslinking degree, low curing temperature, and high thermal stability after curing; its bonding performances met the requirements for Class II plywood specified in GB/T 17657(2013).

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氧化改性核桃饼基木材胶粘剂的制备及性能研究

核桃饼由于其丰富的蛋白质和碳水化合物，有潜力用于制备木材胶粘剂。采用高碘酸钠或高锰酸钾对核桃饼进行处理后，直接用作木材胶粘剂。比较了它们的结合性能、固化性能、热性能和化学结构。结果表明：(1)kmno4的氧化是非选择性的。反应剧烈，氧化程度和降解程度变化大，氧化产物粘度大，涂覆难度大，活性醛含量低。(2) NaIO4氧化具有选择性；反应温和，易于控制。该处理可以产生更多的活性醛，有利于构建胶粘剂的空间网状结构。(3)与KMnO4氧化制得的核桃饼胶粘剂相比，NaIO4氧化制得的核桃饼胶粘剂具有结构更致密、交联度更高、固化温度低、固化后热稳定性高等特点；粘接性能达到GB/T 17657（2013）对II类胶合板的要求。

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来源期刊

Bioresources 工程技术-材料科学：纸与木材

CiteScore

2.90

自引率

13.30%

发文量

397

审稿时长

2.3 months

期刊介绍： The purpose of BioResources is to promote scientific discourse and to foster scientific developments related to sustainable manufacture involving lignocellulosic or woody biomass resources, including wood and agricultural residues. BioResources will focus on advances in science and technology. Emphasis will be placed on bioproducts, bioenergy, papermaking technology, wood products, new manufacturing materials, composite structures, and chemicals derived from lignocellulosic biomass.