Application of methylol urea/natural rubber copolymer composite for emulsion paint formulation

This work is a follow up to our quest to develop emulsion paint from amino resin. Both pure urea methylol (MU) and methylol urea/Nature rubber (MU/NR) blend were prepared. Some physico-chemical properties such as viscosity, melting point, moisture uptake, refractive index, density, elongation at break and formaldehyde emission of both MU and MU/NR were evaluated. The result revealed that MU/NR blend possesses better water resistant, hardness, flexibility and low formaldehyde mission while the pure MU gave better refractive index. Emulsion paints were also formulated from both resins and some physico-chemical properties namely pH, viscosity, flexibility, hardness, tackiness, resistance to blistering, dry time, gloss and storage stability were investigated. Emulsion paint derived from MU/NR binder except for gloss passed the entire test conducted while the one from pure MU binder failed flexibility, adhesion, hardness, tackiness and dry time. This work presents MU/NR paint as a high quality one and hence, may introduce a novel emulsion paint derived from MU/NR binder into the coating industry. Key words: Amino resin, methylol urea, natural rubber, binder, emulsion paint

Optimisation of Adhesive Made From Polyurethane and Polystyrene (PU/PS) Waste Plastics

<p>The waste Polyurethane (PU) and Polystyrene (PS) plastics were blended to develop an adhesive. The developed adhesive was characterized and optimized for optimum performance. The scanning electron microscope of the new adhesive was carried out to understand the surface morphology of the new adhesive. The different blend of PU/PS were also optimized for physico-chemical parameters such as density, turbidity, viscosity, gel time, refractive index, melting point, moisture uptake and solubility in water. The physico-chemical parameters were in conformity with the literature. This show that this formulated adhesive can replace conventional adhesives with improved properties. This study also proffers solution to pollution problems arising from polyurethane and polystyrene wastes by converting this environmentally threatening wastes plastic into adhesive for surface application.</p&gt