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Citation: GUO Li-Ping, LIU Ming, LEI Jia-Heng, DU Xiao-Di, SHI Heng-Xin. Influences of Fe²⁺/H₂O₂ on ζ Potential and Stability of Colloidal Urea-Formaldehyde Resins[J]. Chinese Journal of Applied Chemistry, ;2010, 27(2): 227-230. doi: 10.3724/SP.J.1095.2010.90142 shu

Influences of Fe²⁺/H₂O₂ on ζ Potential and Stability of Colloidal Urea-Formaldehyde Resins

Department of Chemistry, Wuhan University of Technology, Wuhan 430070

Received Date: 27 February 2009
Revised Date: 16 May 2009

The influences of Fe²⁺/H₂O₂ on the ζ potential and stability of colloidal urea-formaldehyde(UF) resins were studied by means of a colloidal chemistry method. The results show that the average ζ potential of urea-formaldehyde colloidal particles is about -32.5 mV 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,which causes a decrease of expulsion potential,the aggregation of colloidal particles,an increase of viscosity and eventually the formation of stable UF resin gels. However,the influences of hydrogen peroxide on ζ potential and the viscosity η of UF colloidal particles are much less than those of the ferrous ions. pH value plays an important role in keeping the stability of the colloidal particles. The system has the highest ζ potential at pH≈9. When pH >9,the absolute value of ζ potential decreases more significantly. The mechanism of Fe²⁺/H₂O₂ affecting the stability of UF adhesive was discussed based on colloidal electric double layers theory.
- urea-formaldehyde resin,
- colloidal stability,
- ferrous ion,
- hydrogen peroxide,
- ζ potential
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Influences of Fe2+/H2O2 on ζ Potential and Stability of Colloidal Urea-Formaldehyde Resins

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通讯作者: 陈斌, bchen63@163.com

Influences of Fe²⁺/H₂O₂ on ζ Potential and Stability of Colloidal Urea-Formaldehyde Resins