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    Novel Lipophilic Surfactant Adjuvants for Spray-Drift Reduction

    Published: 2013

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    There are several types of drift-reduction technology (DRT) adjuvants commercially available. Natural and synthetic water-soluble polymers function by increasing extensional or shear viscosity. These polymers do a very good job reducing fines, but they can significantly increase volume median diameter (VMD) and broaden the particle-size distribution (PSD). Oil-based products produce emulsions that function to keep small spray drops from forming during the atomization process. A novel DRT adjuvant chemistry has been discovered that reduces fines without increasing VMD or broadening PSD significantly. This novel chemistry is lipophilic surfactants. These surfactants were tank mixed with a glyphosate dilution and their spray PSD was measured using a Sympatec HELOS/KF laser diffraction particle-size analyzer. The experimental procedure followed ASTM Standard Test Method E2798-11 [“Characterization of Performance of Spray Drift Reduction Adjuvants for Ground Application,” Annual Book of ASTM Standards, Vol. 11.05, ASTM International, West Conshohocken, PA, 2011]. The standard uses measurements of particle-size distribution generated when the spray-tank mixture includes the pesticide formulation. The lipophilic surfactant used in this study was an alcohol alkoxylate. This surfactant significantly reduced fines by 40 % to 50 %, and it narrowed the particle-size distribution.


    tank mix adjuvant, spray-drift reduction, drift-reduction adjuvant, glyphosate, droplet particle size

    Author Information:

    Elsik, Curtis M.
    Huntsman Corp., The Woodlands, TX

    Schweiner, Tammy M.
    Huntsman Corp., The Woodlands, TX

    Committee/Subcommittee: E35.22

    DOI: 10.1520/STP1558104616