| Abstract: | Structural characteristics of modified sodium lignosulfonate GCL4-1 were investigated with infrared spectrum, potentionmetric titration and gel chromatography, Results showed that GCL4-1’s sulfonic group content was obviously increased compared with original sodium lignosulfonate LS, and its sulfonation degree was increased from original 1.33 mmol/g to 1.96 mmol/g; Weight and number average molecular weight of GCL4-1 were 9700 and 2300, respectively. Influence of GCL4-1 on the applied ?properties of pesticide water-dispersible granules (WG) were further studied, when GCL4-1 was used as dispersant, the suspension percentages of WG before and after heated storage were both above 90%; the dispersion had excellent stability, the phase thickness of suspension was only 0.386 mm after two hours and the particle size was 7.22 μm. The value of EC90 of 80% dimethomorph WG’s control of cucumber downy mildew was 58.32 mg/L, and the value of LC50 of 80% fipronil WG samples on diamondback moth was 0.5196 mg /L, which meaned the indoor toxicity of the two WGs reached the level of the best foreign similar products. The comprehensive property of GCL4-1 is better than Kinsperse126 of the Borregaard company, which shows that GCL4-1 is a green pesticide dispersant with good performance price ratio. |
