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Citation: SUN Tingting, ZHANG Shuqin, LU Fusui, CHEN Tiantian. Effect of Styrene-Maleic Anhydride Copolymer on the Dispersibility of 20% Diflubenzuron Suspension Concentrate[J]. Chinese Journal of Applied Chemistry, ;2012, 29(9): 1046-1052. doi: 10.3724/SP.J.1095.2012.00429 shu

Effect of Styrene-Maleic Anhydride Copolymer on the Dispersibility of 20% Diflubenzuron Suspension Concentrate

1.
College of Chemistry and Materials Science of Shandong Agricultural University, Taian 271018, China

Corresponding author: ZHANG Shuqin,
Received Date: 25 September 2011
Available Online: 9 November 2011
Fund Project: 山东省自然科学基金(ZR2009DM032) (ZR2009DM032)山东省博士基金(2008BS07016) (2008BS07016)山东农业大学青年创新基金(23621)资助项目 (23621)

With benzoyl peroxide as initiator,a series of styrene-maleic anhydride copolymer was prepared by solution copolymerization under different temperatures.Polystyrene-maleic anhydride sulfonic acid sodium(SSMA) with different relative molecular mass was obtained by sulfonated the polystyrene-maleic anhdride.The dispersibility of 20% diflubenzuron suspension concentrate was identified by assaying and analyzing the diameter of particles,Zeta potentials and viscosities.The results showed that the optimal dispersant was SSMA,which was prepared at 75℃,and the most suitable concentration was 3%.At pH=9,the dispersion stability of suspension concentrate was the best due to the strong steric hindrance provided by completely ionizing of the molecules.Na⁺ or Ca²⁺ was able to decrease the absolute value of Zeta potential by compressing the electronic double layer thickness of particles surface,which could lead to particles aggregation due to the reduction of electric quantity and ultimately deteriorate the dispersive effect of suspension concentrate.If the ions concentration were the same,the coagulation capacity by Ca²⁺ was stronger than that of Na⁺,and the dispersion stability of suspension was worse after adding Ca²⁺.
- styrene-maleic anhydride copolymer,
- diflubenzuron,
- suspension concentrate,
- dispersibility
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