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| A Study of the Adsorption Property of Dispersant of Polycarboxylate onto Pyraclostrobin Particle Surfaces by Using FT-IR, XPS and SEM |
| WANG Li-ying1,2，XU Yan3，JIANG Zhen-dong2，XU Yong2，XIANG Sheng2，GUO Xin-yu2，WU Xue-min2* |
1. Shenyang University of Chemical Technology, Shenyang 110142, China
2. College of Science，China Agricultural University，Beijing 100193，China
3. Beijing Mindleader Agroscience Co., Ltd., Beijing 102206, China |
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Abstract The main methods in performing the study of the adsorption properties of polycarboxylate onto pyraclostrobin particle surfaces were FTIR, XPS and SEM from the microscopic view, and the study results provided the theory basis for the application of dispersant polycarboxylate in pyraclostrobin suspension concentrate. The results showed: Infrared spectra is not a new adsorption peak after pyraclostrobin adsorbed polycarboxylate dispersant; the results suggested that physical adsorption is mainly between pyraclostrobin and polycarboxylate dispersant; van der Waals force is the main force. After adsorption of polycarboxylate dispersant by pyraclostrobin particles, the peak intensity of N and Cl of the interface of pyraclostrobin particle decreased sharply, while the adsorption of C and O of the interface of pyraclostrobin particle increased, the Na peak appeared also after pyraclostrobin adsorbed the dispersant. This is mainly the polycarboxylate dispersant C, O and Na contribution, which indicates that polycarboxylate dispersant was adsorbed on the surface of pyraclostrobin. The calculating thickness of the adsorption was 1.22 nm by the characterized element Cl. The morphology of the sample was investigated by scanning electron microscopy. After the polycarboxylate dispersant was adsorbed, many fine particles were adsorbed on the surface of the original smooth pyraclostrobin particles, which were distributed in an orderly manner. This was attributed to the fact that dispersant hydrophobic group formed a coating for pyraclostrobin particles, then hydrophilic groups were fully exposed, thus effectively blocking the pyraclostrobin agglomeration between particles and thereby enhancing the physical stability of pyraclostrobin suspension.
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Received: 2017-11-13
Accepted: 2018-02-25
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Corresponding Authors:
WU Xue-min
E-mail: wuxuemin@cau.edu.cn
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