Abstract
Allyl alcohol polyoxyethylene ether (APEG), hydroxyethyl methacrylate (HEMA) and styrene sodium sulfonate (SSS) were used as monomers to obtain a APEG-HEMA-SSS comb-like polymer, which was employed as the polysulfonate dispersant for pendimethalin suspensions in this paper. The comb-like polymer has an anionic polysulfonate backbone, hydrophilic APEG side chains and sulfonic acid groups, which makes the dispersant absorb easily on the surface of pendimethalin particles. The polysulfonate dispersant with good dispersion performance was screened out by orthogonal experiments. The surface tension, zeta potential, particle size and dynamic contact angle of the pendimethalin suspension with APEG-HEMA-SSS as dispersant were investigated. The dispersant improves the dispersibility and wettability of the pendimethalin suspension observably.
Highlights
In practice, during storage, and it is prone to problems such assuspension thickening,has deposition, agglomerait has been found that high-content pendimethalin bad stability during tion, water-separation so on, thereby affecting the efficacy of the pendimethalin storage, and it is prone and to problems such as thickening, deposition, agglomeration, watersuspension, andsothe of highly dispersants are an effective way to and imseparation and on,rational therebyuse affecting the active efficacy of the pendimethalin suspension, the rational use of highly dispersants are an effective way to In improve the stability prove the stability of highactive content pendimethalin suspension this work, pendiof high content pendimethalin
The experimental results showed that the sequence of factors affecting the flow point of pendimethalin particles was: hydroxyethyl methacrylate (HEMA):sodium styrene sulfonate (SSS) molar ratio > temperature > initiator >
The results show that when the amount of dispersant is between 10% and 12%, pendimethalin suspension with a narrow particle size distribution can be obtained
Summary
A dispersant refers to a type of surfactant which can stably disperse solids or liquids A in dispersant an incompatible medium through a certain repulsion principle polyrefers to a type of surfactant whichcharge can stably disperse solids ororliquids mer hindrance effect. Dispersion for lipophilic materialsprinciple in wateror is polymer an important in ansteric incompatible medium a certain charge repulsion steric part of the effect. Production processfor of lipophilic many materials, andinthe dispersant is one of the hindrance. 1) is a widely usedenvironmental aniline selective herbicidePendimethalin with long-lasting efficacy. 1) isina practice, it has been found that high-content pendimethalin suspension has bad stability widely used aniline selective herbicide with long-lasting efficacy. In practice, during storage, and it is prone to problems such assuspension thickening,has deposition, agglomerait has been found that high-content pendimethalin bad stability during tion, water-separation so on, thereby affecting the efficacy of the pendimethalin storage, and it is prone and to problems such as thickening, deposition, agglomeration, watersuspension, andsothe of highly dispersants are an effective way to and imseparation and on,rational therebyuse affecting the active efficacy of the pendimethalin suspension, the rational use of highly dispersants are an effective way to In improve the stability prove the stability of highactive content pendimethalin suspension [1].
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