变性淀粉在不同工艺下对树脂甲醛释放量的影响

doi:10.11707/j.1001-7488.20140720

林业科学 ›› 2014, Vol. 50 ›› Issue (7): 143-148.doi: 10.11707/j.1001-7488.20140720

变性淀粉在不同工艺下对树脂甲醛释放量的影响

孙瑾¹, 朱晓枫¹, 高振忠¹, 徐恩光¹, 王晓波¹, 林锐航²

1. 华南农业大学林学院广州 510642;
2. 广州市质量监督检测研究院广州 510750

收稿日期:2013-12-02 修回日期:2013-12-16 出版日期:2014-07-25 发布日期:2014-07-04
基金资助:
“双打”中游离苯乙烯测定与木材鉴定术语研究（2012104006-8）。

Effect of Oxidized Starch on Free Formaldehyde under Different Processes

Sun Jin¹, Zhu Xiaofeng¹, Gao Zhenzhong¹, Xu Enguang¹, Wang Xiaobo¹, Lin Ruihang²

1. College of Forestry, South China Agricultural University Guangzhou 510642;
2. Guangzhou Institute of Quality Supervision and Testing Guangzhou 510750

Received:2013-12-02 Revised:2013-12-16 Online:2014-07-25 Published:2014-07-04
Contact: 高振忠

摘要/Abstract

摘要：

以玉米淀粉为原料，利用α-淀粉酶及糖化酶对玉米淀粉进行酶解处理，再用过氧化氢对其进行氧化并通过强酸工艺于不同合成的阶段加入变性淀粉对脲醛树脂进行改性。结果表明：与未改性脲醛树脂中的游离甲醛含量（0.3%）相比，改性后的脲醛树脂游离甲醛含量降到0.12%~0.179%之间，甲醛释放量从未改性前的4.3 mg·L^-1降低到2.5~1.0 mg·L^-1不等。对改性前后的脲醛树脂固化后进行结构上的比较分析，结果表明：改性脲醛树脂游离甲醛含量和甲醛释放量的减少及胶合强度的变化，可能是由于变性淀粉的羧基与脲醛树脂结构中的氨基、亚氨基发生反应，导致葡萄糖五元环被引入到脲醛树脂结构中，同时羧基与羟甲基反应可生成酯键，羟基与甲醛反应在一定程度上也减少了甲醛释放量。

关键词: 变性淀粉, 酶解, 树脂, 游离甲醛, 甲醛释放量, 胶合强度

Abstract:

In this paper, starch was modified by α-amylase, saccharifying enzyme,and hydrogen peroxide. Strongly acid process was used in this paper, the effect of modified starch (MS) addition during the synthesis of UF resins at different pH environments were investigated in detail. The addition of MS had good performance (0.12%-0.179%) in reducing free formaldehyde compared with the unmodified UF (0.3%), formaldehyde emission can reduce from (2.5-1.0 mg·L^-1) to the unmodified UF 4.3 mg·L^-1. Compared the structures of modified UF and the unmodified UF, the carboxyl in modified starch can react with amino group and imino group, which will introduce the glucose five-membered ring into the UF chain. And at the same time, the formation of ester group which was formed by the reaction between carboxyl and hydroxymethyl, the reaction between formaldehyde and hydroxyl in the glucose ring, in some way, also could introduce the glucose five-membered ring into the UF chain, which would play a role in the enhance of the bonding strength and reducing the formaldehyde emission.

Key words: modified starch, enzymolysis, resin, free formaldehyde, formaldehyde emission, bonding strength

中图分类号:

TQ433.4⁺31

孙瑾, 朱晓枫, 高振忠, 徐恩光, 王晓波, 林锐航. 变性淀粉在不同工艺下对树脂甲醛释放量的影响[J]. 林业科学, 2014, 50(7): 143-148.

Sun Jin, Zhu Xiaofeng, Gao Zhenzhong, Xu Enguang, Wang Xiaobo, Lin Ruihang. Effect of Oxidized Starch on Free Formaldehyde under Different Processes[J]. Scientia Silvae Sinicae, 2014, 50(7): 143-148.

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变性淀粉在不同工艺下对树脂甲醛释放量的影响

Effect of Oxidized Starch on Free Formaldehyde under Different Processes

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