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Citation: ZHUANG Zhan-Xinga, LU Fu-Suia, CHEN Tian-Tiana, LI Weia, GUO Wen-Tinga, LUO Wan-Chun. Effect of Polymer Dispersant on Rheological Properties of Hexaflumuron in the Form of Aqueous Suspension Concentrate[J]. Chinese Journal of Applied Chemistry, ;2010, 27(4): 470-473. doi: 10.3724/SP.J.1095.2010.90515 shu

Effect of Polymer Dispersant on Rheological Properties of Hexaflumuron in the Form of Aqueous Suspension Concentrate

a. College of Chemistry and Materials Science, Shandong Agricultural University, Tai'an 271018;
b. Shandong Province Pesticides Research Institute, Ji'nan

Received Date: 31 July 2009
Revised Date: 14 October 2009

The rheology of hexaflumuron in the form of aqueous suspension concentrate(SC) was studied by means of controlled stress rheometer,with the particular emphasis on the effects of polymer dispersant MOTAS (Styrene-acrylic acid random copolymer) mass concentrations,molecular mass and hexaflumuron mass concentrations.It was found that the rheological behavior of hexaflumuron SC,which contained MOTAS,coincided with the Herschel-Bulkley rheological model.For a hexaflumuron mass concentration of 20%,the SC was pseudoplastic fluid and the flow behavior index n ≤ 1.0 when the MOTAS mass fraction was less than 3.0%; the SC was bulging plastic fluid and the flow behavior index n ≥ 1.0 while the MOTAS mass fraction was more than 3.0%.The yield value τ_H of hexaflumuron SC was correlated with the relative mass fractions of MOTAS and hexaflumuron.Little MOTAS was adsorbed on the hexaflumuron granule surface in its concentration ≤ 2.5%,and the uncoverd granules were connected with each other in some structures,which resulted in the biggist τ_H.When MOTAS mass fraction was 3.0%,saturated adsorption was achieved on the granule surfaces.The excessive MOTAS connected with each other in some structures,which produced the biggist τ_H likewise.Between dispersant MOTAS molecular mass 10 000 and 30 000,with the increase of MOTAS molecular mass,the viscidity and yield value τ_H of hexaflumuron SC decreased,while the flow behavior index n increased slightly.The n values were all less than 1,and the property of "shear thinning" of the pseudo-plasticity was not changed.
- Hexaflumuron,
- MOTAS dispersant,
- rheology,
- yield value,
- rheological behavior index
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