Preparation, Characterization and Stability of Avermectin Nano Aqueous Dispersion†

doi:10.7503/cjcu20150095

Abstract

Abstract:

Two reactive hydroxyl groups made avermectin a component to prepare anionic polyurethane dispersant containing avermectin structure units. The structure of the resulting dispersant was characterized by ¹H nuclear magnetic resonance spectrometer and infrared spectrometer. Based on the structural similarity between the dispersant and avermectin, avermectin nano aqueous dispersion was fabricated via addition the solution of dispersant and avermectin into water. The influences of carboxyl content and the molecular weight of the dispersant on the particle size of the dispersion were investigated. The results indicated that smaller particles were obtained at higher carboxyl content and the dispersing ability was affected by the molecular weight of the dispersant. The transmission electron microscopic image of the dispersion revealed that almost spherical particles with most of the size in the range of 20—40 nm were formed. Moreover, the dispersion displayed high centrifugal stability and dilution stability.

Key words: Avermectin, Dispersant, Nano size, Aqueous dispersion, Pesticide

CLC Number:

O633.2

TrendMD:

ZHANG Wenxiang, MEI Hao, GUAN Wenxun, TANG Liming. Preparation, Characterization and Stability of Avermectin Nano Aqueous Dispersion^†[J]. Chem. J. Chinese Universities, 2015, 36(6): 1208.

Figures/Tables 7

References 21

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No.	n(Avm)∶n(TDI)∶n(DMPA)	Mass fraction of DMPA(%)	Z-average size of dispersant/nm	Z-average size of dispersion/nm
1	4∶10∶6	13.2	464.1	Precipitation
2	4∶11∶7	14.6	53.9	95.8
3	4∶12∶8	15.9	31.0	33.8
4	4∶13∶9	17.1	29.9	30.3
5	4∶14∶10	18.2	21.2	28.3
6	0∶1∶1	43.5	Dissolved	Precipitation

No.	n(Avm)∶n(TDI)∶n(DMPA)	Mass fraction of DMPA(%)	Z-average size of dispersant/nm	Z-average size of dispersion/nm
1	4∶10∶6	13.2	464.1	Precipitation
2	4∶11∶7	14.6	53.9	95.8
3	4∶12∶8	15.9	31.0	33.8
4	4∶13∶9	17.1	29.9	30.3
5	4∶14∶10	18.2	21.2	28.3
6	0∶1∶1	43.5	Dissolved	Precipitation

No.	n(Avm)∶n(TDI)∶n(DMPA)	n(NCO)∶n(OH)	M_w	M_n	M_w/M_n	Z-average size of dispersion/nm
3	4∶12∶8	1∶1	11654	8937	1.30	33.8
7	4∶13∶8	1.08∶1	9485	7353	1.29	22.7
8	4∶14∶8	1.17∶1	7525	6266	1.20	31.6
9	4∶15∶8	1.25∶1	5928	4804	1.23	Precipitation

No.	n(Avm)∶n(TDI)∶n(DMPA)	n(NCO)∶n(OH)	M_w	M_n	M_w/M_n	Z-average size of dispersion/nm
3	4∶12∶8	1∶1	11654	8937	1.30	33.8
7	4∶13∶8	1.08∶1	9485	7353	1.29	22.7
8	4∶14∶8	1.17∶1	7525	6266	1.20	31.6
9	4∶15∶8	1.25∶1	5928	4804	1.23	Precipitation