关键词:

木质素磺酸钠, 烯酰吗啉, 水分散粒剂, 分散剂

Abstract:

Structural characteristics of different sodium lignosulfonates (SLs),Kinsperse126,Ultrazine Na,Borresperse Na, GZMN, and SXMN were investigated with ultraviolet spectrum, gel chromatography and chemical titration.The total hydrophilic groups content of Ultrazine Na was 5.46 mmol•g^-1, which was the highest among these SLs.The sulfonic groups content of Kinsperse126 was 2.05 mmol•g^-1, which was the highest among these SLs.The weight-mean relative molecular weight (M_w) of GZMN was 13000, which was the largest of these SLs.M_w of SXMN was 10000.Each SL was used as dispersant of dimethomorph water-dispersible granules (WG) respectively.The properties of dimethomorph WG were also investigated.The suspending rate of the WG with Kinsperse126 was as high as 95.03%.The suspending rate of the WG with SXMN was 89.70%.The dispersion ability of SL increased with increasing content of sulfonic groups and increasing M_w.Moreover, the sulfonic groups content was more important than M_w.Turbiscan LabExpert was initially used to estimate the stability of dimethomorph WG’s suspension.The suspension with Kinsperse126 had the best stability, in which deposition did not appear until 15 min and the height of sediment was only 0.38 mm.Particle size increase in the WG’s suspension with GZMN was only 0.59 μm which was the lowest.The stability depended on the dispersion ability of SL; furthermore, a larger M_w could weaken particle size increase.

Key words:

木质素磺酸钠, 烯酰吗啉, 水分散粒剂, 分散剂