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Citation: DU You-Chen, LIU Yue-Qun, ZHU Bing-Yu, LIU Feng. Effect of Sodium Lignosulphonate on the Performance of Pendimethalin Microcapsules[J]. Chinese Journal of Applied Chemistry, ;2009, 26(1): 112-115. shu

Effect of Sodium Lignosulphonate on the Performance of Pendimethalin Microcapsules

1.
College of Plant Protection, Shandong Agricultural University, Taian 271018

Corresponding author: LIU Feng,
Received Date: 20 December 2007
Available Online: 12 April 2008

The microcapsules of pendimethalin were prepared with 9 different sodium lignosulphonates as dispersant by in-situ polymerization.The factors affecting the morphology and the encapsulation efficiency and the particle-size were investigated,and the stability was also determined.The results show that the viscosities of the microcapsule suspensions prepared with the four sodium lignosulphonates whose sulfonation degrees were about 0.8 were higher than 12 mPa·s,while the viscosities of the microcapsules prepared with other five dispersants whose sulfonation degrees were about 3.0 and 3.5 were lower than 10 mPa·s.The particle-size of the microcapsule prepared with the ligninsulfonate of the same degree of sulfonation decreased with the molecular mass increasing.The microcapsules prepared with sodium lignosulphonates of higher molecular mass and higher degree of sulfonation had higher stability and were suited to the requirements of microcapsules.When the molecular mass of the sodium lignosulphonate was under 5 000,the microcapsules were easy to crack.The molecular mass and degree of sulfonation had little effect on the encapsulation ratio.All the encapsulation ratios of the microcapsulates prepared with different sodium lignosulphonates were above 94%.
- sodium lignosulphonate,
- pendimethalin,
- microcapsules,
- molecular mass,
- degree of sulfonation
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