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

Abstract

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

CLC Number:

TQ433.4⁺31

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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Effect of Oxidized Starch on Free Formaldehyde under Different Processes

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