A water-based polyurethane drug-loaded slow-release spray with opposite charges and its preparation method and application
A technology of water-based polyurethane and opposite charge, which is applied in the direction of botany equipment and methods, applications, chemicals for biological control, etc., and can solve the problems of low leaf deposition rate, affecting the efficacy of pesticides, and easy bouncing of droplets, etc. Achieve the effect of increasing the deposition rate, improving the slow-release performance of pesticides, and the ability to withstand rain erosion
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Embodiment 1~24
[0072] This embodiment is anionic water-based polyurethane drug-loaded slow-release emulsion A or cationic water-based polyurethane drug-loaded slow-release emulsion B. According to the formula shown in Table 1, respectively mix diisocyanate and macromolecular polyol according to a certain molar ratio and disperse them evenly; After the catalyst reacts for 10-60 minutes (the first stage reaction), then add methyl ethyl ketone to dilute, and continue the reaction for 30-50 minutes (the second stage reaction); cool to room temperature, add a neutralizer (alkaline neutralizer neutralizes anionic water-based Polyurethane, acid neutralizer and cationic water-based polyurethane) neutralize for 10-30 minutes; dissolve the hydrophobic pesticide with a small amount of volatile organic solvent, add 8-20% dosage to the reactant and disperse evenly; under strong stirring (500-1000rpm) add water for emulsification for 30-120min, remove methyl ethyl ketone by rotary evaporation, and obtain ...
Embodiment 25
[0080] This example provides a pesticide spray formulation prepared from an aqueous polyurethane drug-loaded slow-release emulsion with opposite charges, wherein A:B=1:1.
[0081] After the anionic water-based polyurethane drug-loaded slow-release emulsion A prepared in Example 18 and the cationic water-based polyurethane drug-loaded slow-release emulsion B prepared in Example 22 were diluted 15 times with deionized water respectively, according to the volume ratio A:B=1 : 1 mixed spraying, recorded as pesticide spray preparation D&M0.84.
Embodiment 26
[0083] This example provides a pesticide spray formulation prepared from an aqueous polyurethane drug-loaded slow-release emulsion with opposite charges, wherein A:B=1:1.
[0084] After the anionic water-based polyurethane drug-loaded slow-release emulsion A prepared in Example 19 and the cationic water-based polyurethane drug-loaded slow-release emulsion B prepared in Example 23 were diluted 15 times with deionized water respectively, according to the volume ratio A:B=1 :1 mixed spraying, recorded as pesticide spray preparation D&M0.99.
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