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Effect of urea formaldehyde viscosity on urea formaldehyde and urea proparaldehyde copolymer composite
Abstract
This work investigates the effect of urea formaldehyde (UF) viscosity on a composite derived from copolymerization reaction between urea formaldehyde (UF) and urea proparaldehyde (UP). Some physical properties of the urea formaldehyde/urea proparaldehyde (UF/UP) copolymer obtained at different UF viscosities (3.91-207.08 mPa.s) were evaluated. The melting point, refractive index, density and formaldehyde emission were found to increase with increase in UF viscosity while the dry time, moisture uptake and
elongation at break were found to decrease with increase in viscosity. UF viscosity below 10.82 mPa.s was found to produce UF/UP copolymer composite which is ductile and soluble in water. Beyond this value, the composite became insoluble in water. Thus processing of UF/PU copolymer resin for emulsion paint formulation should be carried out below 10.82 mPa.s viscosity level. The results obtained from this experiment will offer formulators different options and will help to control formulation processes towards developing
UF/UP copolymer composite as a paint binder for emulsion paint formulation.
Keywords: Copolymerization, viscosity, Paint binder.
International Journal of Biological and Chemical Sciences Vol. 2 (4) 2008: pp. 425-433
