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Studies on the Selection of Chlorfluazuron Sc Wetting Dispersant and Mechanism of Stability

Author: WuBuHua
Tutor: LuFuSui
School: Shandong Agricultural University
Course: Applied Chemistry
Keywords: Chlorfluazuron SC Wetting and dispersing agent Zeta potential Rheological properties Physical adsorption
CLC: TQ450.45
Type: Master's thesis
Year: 2010
Downloads: 151
Quote: 1
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Abstract


The the pesticide aqueous suspension multiphase coarse dispersion system, thermodynamic stability and kinetic stability are poor, become a bottleneck restricting the the pesticide aqueous suspension of research and development. Thermodynamic stability of their processing of the aqueous suspensions of pesticides used in the wetting and dispersing additive, to study the principle role of wetting and dispersing additive in the aqueous suspensions of pesticides and processing, and the development and selection of the wetting and dispersing additive, and solutions of pesticides The aqueous suspensions of the thermodynamic stability is important. Suspending the wetting dispersant chlorfluazuron screening, pH, salt ions and other factors on the physical stability of suspending further study on this basis, while the of chlorfluazuron SC's stable mechanism study of the system. Flow point of this thesis was the study of the following aspects: 1 10% chlorfluazuron suspending wetting and dispersing agent, the initial screening, the in flow point Screening results based on the use of laser particle size analyzer measurement grain diameter of the dispersant further screening. The results showed that farmers milk 602 dispersant NNO MOTAS able processed into a good mobility chlorfluazuron water suspending the optimal combination method and viscosity law ultimately determine the wetting and dispersing agent for aqueous suspension of 10% chlorfluazuron : the AGRICULTURE AND milk 602 and MOTAS of the ratio is 4:1, and the amount is 0.8%. Wetting and dispersing agent screening based on the determination by the determination of zeta potential and rheological systematic study of pH, salt ions and other factors that impact on the of chlorfluazuron suspension stability. The results show that: (1) chlorfluazuron the Zeta potential of the suspension in the experimental pH range are negative, with the increase in the absolute value of the pH value first increases and then decreases slightly, and the greatest absolute value in the vicinity of pH 8.5. pH influence the dissociation of the ionic polymeric dispersant in the aqueous solution, thereby affecting its dispersion stabilizing effect of the play in the suspensions. (2) the addition of different salt ions are suspending Zeta potential impact. The Zeta potential of the suspensions with the NaCl concentration is increased first increase has been reduced, has been increasing with the increasing concentration of MgCl 2 , and at the same salt concentration, mM MgCl 2 < / sub> effects are more significant; NaCl, MgCl 2 the two salts solution was added, can increase the viscosity of the suspension of the chlorfluazuron, but the degree of influence is different. MM MgCl in 2 concentration range, suspending the non-Newtonian index n is less than 1, and slightly decreased with the increase of the concentration. The above results indicate that the pH and the salt concentration of an impact on the physical stability of the chlorfluazuron suspensions. 3 we dispersion agent MOTAS of polycarboxylate salts as the research object, the determination by infrared spectroscopy and UV spectroscopy, adsorption isotherms, study the forces between the molecules of the dispersant chlorfluazuron particle surface and its adsorption properties. Chlorfluazuron the adsorption particles on MOTAS affected by many factors, in addition to the material itself, but also by the impact of temperature, pH, salt ions. Infrared spectra, ultraviolet spectra described Motas dispersant in chlorfluazuron particle interface adsorption is physical adsorption, hydrogen bonding and π-π conjugate action is a the dispersant molecule chlorfluazuron surface binding force; Motas dispersant in chlorfluazuron surface adsorption monolayer adsorption, available Langmuir adsorption isotherm linear fit its saturation adsorption capacity decreases with temperature increase first; pH value and salt ions on the adsorption of the dispersant impact, decrease the amount of adsorption increased with increasing pH value, with a higher concentration of salt ions adsorbed amount decreases first, and finally stabilized; the desorption experiment results Description the dispersant and Chlorfluazuron between the particle surface the existence of strong intermolecular forces, further demonstrates the role of hydrogen bonds and π-π conjugated is the dispersant molecules Chlorfluazuron surface binding important force.

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CLC: > Industrial Technology > Chemical Industry > Pesticide Industry > General issues > Raw materials and additives > Additives
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