Preparation and performance investigation of high-performance lignin-based nanopesticide dispersant
Dispersants containing lignosulfonate were commonly used in pesticides,but they failed to meet the requirements for nanoparticle pesticide dispersion.Lignin samples with varying molecular weights and degrees of sulfonation were prepared through the process of sulfomethylation combined with alkyl bridging.The influence of molecular weight and degree of sulfonation on their dispersion stability in nanopesticide suspensions was explored.The results indicated that,at the same degree of sulfonation,the dispersion stability of lignin dispersants was initially improved and then decreased with increasing molecu-lar weight.To achieve the best dispersion effect,the sulfonation degree and molecular weight of lignin needed to be coordinated.As the sulfonation degree increased,the appropriate molecular weight should also increase accordingly.GCL4-Nano,with a sulfonation degree of 1.58 mmol/g and a molecular weight of 14 897 Da,was found to exhibit excellent dispersion stability for nanopesticides of different varieties.The nanopesticide suspensions prepared had an average particle size ranging from 165 nm to 206 nm,with a suspension rate exceeding 95％.Additionally,they demonstrated excellent wetting properties,re-sistance to rainwater washing,and photostability.
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