Fe2+/H2O2对脲醛树脂胶ζ电位及其稳定性的影响

doi:10.3724/SP.J.1095.2010.90142

摘要/Abstract

摘要：

采用胶体化学的方法对Fe²⁺ /H₂O₂影响脲醛树脂（UF）胶ζ 电位及其稳定性的因素进行了研究。结果表明，在pH＝8.0时，脲醛树脂胶粒的ζ 电位平均值约－32.5mV，粒子带负电，并以单分散形式存在。随着Fe²⁺离子或H₂O₂加入量的增加，脲醛树脂胶ζ 电位的绝对值迅速减小，从而使胶粒间排斥势垒降低，胶粒发生聚集，体系粘度随之增大并最终产生凝胶。其中，Fe²⁺离子对脲醛树脂胶粒的ζ 电位和粘度η 变化的影响幅度比H₂O₂更为明显。pH值对胶体稳定性的影响主要表现在，pH值约为9时，体系具有最大的ζ 电位，除此之外，pH值增大或减小ζ电位的绝对值均迅速减小，其中pH＞9时ζ电位的绝对值下降幅度更为明显。采用胶体的双电层理论对Fe²⁺ /H₂O₂影响脲醛树脂胶稳定性的机理进行了探讨。

关键词: 脲醛树脂, 胶体稳定性, Fe2 离子, H2O2, ζ 电位

Abstract:

The influence of Fe²⁺ /H₂O₂ on colloidal ζ potential and stability of Urea-Formaldehyde (UF) resins were studied by means of colloidal chemistry method. The results show that the average ζ potential of urea-formaldehyde colloidal particles is about -32.5mV at a pH value of 8.0 and they exist in monodisperse state. The ζ potential is decreased rapidly with the addition of ferrous ions or hydrogen peroxide. As the exclusion barrier decreases, colloidal particles begin to aggregate, viscosity also increases and UF resin eventually gels. However, the influence of hydrogen peroxide on ζ potential and the viscosity η of UF colloidal particles are much less than the ferrous ions. pH value plays an important role in keeping the stability of the colloidal particles, When pH≈9, the system has the biggest ζ potential, besides , the absolute values of ζ potential reduce rapidly by either increase or decrease of pH value, when pH>9 the absolute value of ζ potential declines even more significantly. The mechanism of Fe²⁺ /H₂O₂ affecting the stability of UF adhesive was discussed based on colloidal electric double layers theory.

Key words: urea-formaldehyde resin, colloidal stability, ferrous ion, hydrogen peroxide, ζ potential

中图分类号:

O631

郭丽萍,刘明,雷家珩,杜小弟,史恒鑫. Fe2+/H2O2对脲醛树脂胶ζ电位及其稳定性的影响[J]. 应用化学, 2010, 27(02): 227-230.

GUO Li-Ping, LIU Ming, LEI Jia-Heng*, DU Xiao-Di, SHI Heng-Xin. Influences of Fe2+/H2O2 on Colloidal ζ Potential and Stability of Urea-Formaldehyde Resins[J]. Chinese Journal of Applied Chemistry, 2010, 27(02): 227-230.

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