This SBIR project will demonstrate the feasibility of using natural guar gum (glactomannan) bio- polymers to manage spray droplet size. Glactomannan amendments in spray mix solutions predictably affect droplet size reducing errant drift. Phase I research will evaluate glactomannan type and concentration necessary to manage droplet size at high shear. Different chemical treatments are optimized by different droplet sizes. Chemical sprays drift. Drift from target areas is the primary concern of commercial applicators and others. Spray amendments made of expensive synthetic polymers provide some drift control. However, synthetic polymers are burdened by environmental and health concerns due to the type of materials used and lengthy biological degradation pathways. Glactomannan (Guar Gum) bio-polymers exhibit rheology (viscosity with shear) characteristics ideally suited for use as an amendment without environmental or health concerns. Research investigation rheology in high shear conditions is proposed. The bio-polymer based amendments is called Spray- Guard. Spray-Guard use depends on predictable droplet size distribution and shear response. Phase I will determine the response of a range of Spray-Guard solutions (<0.1 to 0.7%) on droplet size, spray distribution and evaporation using atomization studies, dynamic surface tension and shear testing.
Anticipated Results/Potential Commercial Applications of Research: Successful demonstration of Spray-Guard as an amendment for spray mixes will result in a bio- degradable, cost effective, polymer with superior engineering features to control drift. Spray-Guard will have an eager market due to the global application potential and reduced cost for spraying. A 5% reduction of drifted agricultural chemicals corresponds to $346-$350 million. The product will provide a practical solution to spray applications used in plant production, protection (herbicides, pesticides, fungicides) and fertilization. There are other applications for fire protection and in industry where spray control is required.
