S-metolachlor and sulfentrazone-containing microcapsule suspension-suspending agent and preparation method thereof
A technology of metolachlor sperm and sulfentrazone is applied in the field of pesticides, and can solve the problems of short duration of effect of metolachlor sperm and sulfentrazone, reduced pesticide control effect, short duration of effect and the like
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[0031] The first aspect of the present disclosure provides a method for preparing a microcapsule suspension-suspension containing sperm metolachlor and sulfentrazone, the method comprising the following steps:
[0032] (1) Mix the first solution and the second solution evenly to obtain the first material; the weight ratio of the first solution to the second solution is (1-4): 1; the first solution contains amino- Formaldehyde resin prepolymer aqueous solution; The second solution contains refined metolachlor emulsifiable concentrate;
[0033] (2) adding a buffer solution to the first material and mixing evenly, so that the pH value of the mixed material is 4.5-7 to obtain a second material;
[0034] (3) adding an acidic pH regulator to the second material and mixing evenly, so that the pH value of the mixed solution is 3-4 to obtain a third material;
[0035] (4) subjecting the third material to solidification polycondensation to obtain a solidified polycondensation product, ...
Embodiment 1
[0055] Mix melamine and 37% by weight formaldehyde solution evenly, react for 2 hours at pH 8 and temperature 70° C.; add water to dilute to obtain melamine-formaldehyde resin prepolymer aqueous solution. Among them, the molar ratio of formaldehyde to melamine is 1:0.6, and the volume ratio of formaldehyde aqueous solution to water is 1:1.5.
[0056] Mix the purified metolachlor, 150# solvent oil and sorbitan monostearate polyoxyethylene ether evenly to obtain refined metolachlor emulsifiable concentrate. Wherein, the weight ratio of refined metolachlor to 150# solvent oil and sorbitan monostearate polyoxyethylene ether is 1:2.5:0.05.
[0057] The obtained melamine-formaldehyde resin prepolymer aqueous solution and refined metolachlor emulsifiable concentrate are mixed uniformly to obtain the first material, wherein the weight ratio of melamine-formaldehyde resin prepolymer aqueous solution and refined metolachlor emulsifiable concentrate is 4:1 , mixed evenly with a stirring...
Embodiment 2
[0061] Mix melamine and 37% by weight formaldehyde solution evenly, react for 4 hours at pH 10 and temperature 60° C.; add water to dilute to obtain urea-formaldehyde resin prepolymer aqueous solution. Wherein, the molar ratio of formaldehyde to urea is 1:0.1, and the volume ratio of water and formaldehyde aqueous solution is 1:1.
[0062]Mix the refined metolachlor, ethanol and sodium lignosulfonate evenly to obtain the refined metolachlor emulsifiable concentrate. Wherein, the weight ratio of refined metolachlor to ethanol and sodium lignosulfonate is 1:0.1:0.01.
[0063] The obtained urea-formaldehyde resin prepolymer aqueous solution and pure metolachlor emulsifiable concentrate are mixed uniformly to obtain the first material, wherein the weight ratio of urea-formaldehyde resin prepolymer aqueous solution and pure metolachlor emulsifiable concentrate is 1:1 , mixed evenly with a stirring speed of 1300 rev / min, and the stirring time was 20 minutes; under the condition of ...
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