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Dispersion property of low-solubility phenol-formaldehyde resin in water
Author(s): 
Pages: 54-57
Year: Issue:  2
Journal: China Synthetic Resin and Plastics

Keyword:  low-solubility phenol-formaldehyde resindispersion propertymolecule aggregatesZeta potential;
Abstract: The hydrodynamic diameter and Zeta potential of low-solubility phenol-formaldehyde resin (LPFR) molecule aggregates and the turbidity of LPFR dispersion were measured to study the dispersion property and stability of LPFR in water. The results show that LPFR molecules are in the form of mono-molecules or small molecule aggregates in deionized water. The Zeta potential of mono-molecules or small molecule aggregates is high and the turbidity of the LPFR dispersion is low. The LPFR dispersion is stable. When adding NaCl to the LPFR dispersion, large molecule aggregates of LPFR molecules with low Zeta potential are formed. The turbidity of the LPFR dispersion increases and the stability of the LPFR dispersion decreases. When adding HCl to the LPFR dispersion, the negative charge density and the Zeta potential of LPFR molecules or aggregates are decreased, and the stability of the LPFR dispersion is reduced. When adding NaOH to the LPFR dispersion, the negative charge density of LPFR molecules or aggregates rises, electrostatic repel force between molecules is enhanced and the stability of the LPFR dispersion is improved.
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