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Citation: WANG Li, LI Li-Fang, JIA Meng-Meng, WANG Jian-Wei, WANG Dong-Qing. Selection of Wetting Dispersant in Pesticide Suspension Concentrate with Zeta Potential Method[J]. Chinese Journal of Applied Chemistry, ;2010, 27(6): 727-731. doi: 10.3724/SP.J.1095.2010.90562 shu

Selection of Wetting Dispersant in Pesticide Suspension Concentrate with Zeta Potential Method

College of Chemistry and Material Science, Shandong Agricultural University, Tai'an 271018

Received Date: 27 August 2009
Revised Date: 4 November 2009

Zeta potential method was used to select wetting dispersant in preparing 20% diflufenican suspension concentrate,the average particle diameter(D_av) of test system was determined using a laser particle distribution instrument. The results show that all test anionic wetting dispersants, beside sodium lignosulfonate,could make the suspension particle to reach the absolute value of Zeta potential (|ζ|) in excess of 40 mV, and the suspension concentrate was comparatively stable. When mixed anionic wetting dispersants (NNO and Morwet D425) were used instead of single NNO or Morwet D425,|ζ|of the suspension system was higher than that of single system at the same usage amount. When m(NNO):m(Morwet D425)=1:4, and mass fraction of the mixture was 1%,|ζ|could reach the maximum and the average particle diameter of the system was the smallest. The changes of|ζ|and D_av were very small after heat storage treatment, and the corresponding system achieved the best dispersion effect. Thus zeta potential value of the suspension concentrate has a good correlation to the average particle diameter. Therefore the dispersing effect of wetting dispersant in suspension concentrate could be well represented by the zeta potential value.
- Zeta potential,
- suspension concentrate,
- wetting dispersant,
- diflufenican
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