Insecticide pirimiphos-methyl microcapsule suspension and preparation method
A technology of methyl pyrimidine phosphine microcapsules and methyl pyrimidine phosphine is applied in the directions of microcapsule preparations, insecticides, and microsphere preparation, etc., and can solve the problems of restricting the use of active substances, high toxicity of isocyanates, and long time for wall materials, etc. Achieving the effect that the particle size can be adjusted, the pest resistance can be delayed, and the number of applications can be reduced
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[0026] Example 1:
[0027] (1) Under the protection of nitrogen, disperse 10g chitosan and 50g glycolide into 50ml dimethyl sulfoxide solution, add 5ml triethylamine, and react at 80℃ for 10 hours to obtain chitosan-aliphatic Polyester graft copolymer. After measurement, the molecular weight of the chitosan-polyglycolide copolymer is 20,000 Da;
[0028] (2) Dissolve 15g of chitosan-polyglycolide graft polymer and 30g of pyrimidinhos methyl in 20ml of dichloromethane;
[0029] (3) Under stirring conditions, add the solution in (2) dropwise to the aqueous solution containing polyvinyl alcohol and mix well. Then shear at high speed for 5 minutes to obtain emulsion;
[0030] (4) Remove the dichloromethane solvent of the emulsion in (3);
[0031] (5) Add dispersant, thickener, and antifreeze to obtain a stable microcapsule suspension that can be transported and stored.
Example Embodiment
[0032] Example 2:
[0033] (1) Under the protection of nitrogen, disperse 5g chitosan and 30g caprolactone into 50ml dimethyl sulfoxide solution, add 3ml triethylamine, and react at 80℃ for 10 hours to obtain chitosan-aliphatic Polyester graft copolymer. After measurement, the molecular weight of the chitosan-polycaprolactone copolymer is 30000 Da;
[0034] (2) Dissolve 25g of chitosan-polycaprolactone graft polymer and 10g of pyrimidinhos-methyl in 30ml of chloroform;
[0035] (3) Under stirring conditions, add the solution in (2) dropwise to the aqueous solution containing Tween-80, and mix well. Then shear at high speed for 5 minutes to obtain emulsion;
[0036] (4) Remove the solvent chloroform of the emulsion in (3);
[0037] (5) Add dispersant, thickener, and antifreeze to obtain a stable microcapsule suspension that can be transported and stored.
Example Embodiment
[0038] Example 3:
[0039] (1) Under the protection of nitrogen, disperse 10g chitosan and 30g lactide into 50ml dimethyl sulfoxide solution, add 3ml triethylamine, and react at 80℃ for 10 hours to obtain chitosan-aliphatic Polyester graft copolymer. After measurement, the molecular weight of the chitosan-polylactide copolymer is 6500Da;
[0040] (2) Dissolve 40g of chitosan-polylactide graft polymer and 20g of pyrimidinhos methyl in 30ml of ethyl acetate;
[0041] (3) Under stirring conditions, add the solution in (2) dropwise to the aqueous solution containing EL-20 and mix well. Then shear at high speed for 5 minutes to obtain emulsion;
[0042] (4) Remove (3) the solvent ethyl acetate in the emulsion;
[0043] (5) Add dispersant, thickener, and antifreeze to obtain a stable microcapsule suspension that can be transported and stored.
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