Abstract
The most important functional property of polyester paint is the flexibility. In this study paints were formulated from local raw material and factors influencing their flexibility were investigated, these factors include the amount and percentage of urea- formaldehyde in the paints. The quantity of the urea-form-altitude was varied from 100- 300g/litre in the paint. Flexibility drying time, o-T and I-T bend test were carried out. It was observed that the formulation that had 100 - 180g/litres passed both 0-T and I-T test with a drying time of 120 and 98 minutes respectively, the other paint of 250 - 300g/litres failed the above test but has a fast drying time of 50,30 and 10 minutes.
Highlights
Polyester Paints are basically paints that are formulated from oil-free unsaturated polyester resin
High molecular weight linear polyesters may be used as physically drying binder components in paints, the majority of uses are in baking enamels for highly flexible coatings, such as coil and can coatings in combination with amino resins or other suitable hydroxyl–reactive cross-linkers
The paint produced passed O-T and l-T test but it was characterized by a slow dry time of about 120 minutes
Summary
Polyester Paints are basically paints that are formulated from oil-free unsaturated polyester resin. They are based on condensation polymerization of diacids such as ophthalmic anhydride, aliphatic diacids and atipic acids which promote extensibility, flexibility and polyhydric alcohols such as trimethyl propane. The high molecular weight left behind after curing or drying provides the film properties in polyester coating. High molecular weight linear polyesters may be used as physically drying binder components in paints, the majority of uses are in baking enamels for highly flexible coatings, such as coil and can coatings in combination with amino resins or other suitable hydroxyl–reactive cross-linkers. The binding medium or binder which in most cases is organic is the most important components in the majority of paint, determine the physical and chemical properties of the paint. Wetting agents are used to facilitate the dispersion of the pigment to keep the pigment in suspension during storage of paint and to pressure the homogeneity of pigment mixture while the paint is drying
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