A controlled-release preparation for eliminating Mikania micrantha and its preparation method
A controlled-release preparation, the technology of Mikania micrantha, applied in the fields of botanical equipment and methods, chemicals for biological control, herbicides and algicides, etc. problems, to achieve the effect of environmental and operator safety, significant elimination effect, and low dosage
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Embodiment 1
[0042] (1) Dissolve 1 g of polyvinyl alcohol in 120 g of distilled water, add 1 g of sodium chloride and 1 g of superfine talc, and stir to obtain an aqueous phase; mix 5 g of methyl acrylate, 5 g of ethyl acrylate, 1 g ethylene glycol diacrylate, 0.2 g azobisisobutyronitrile, 12 g sulfuron-methyl, and 20 g butyl acetate were mixed evenly to obtain an oil phase; the water phase was transferred into a reaction flask, and the oil was introduced while stirring phase, then stirred at a speed of 600 r / min for 20 minutes, and at the same time passed nitrogen gas to remove the air in the reaction flask; raised the temperature to 70°C, polymerized for 3 h under nitrogen protection and constant stirring at 400 r / min, and filtered Microspheres with a drug loading of metsulfuron-methyl were obtained at 30%.
[0043] (2) Dissolve 4 g of xanthan gum and 40 g of polyacrylamide in 1000 g of water to make a dilute solution, and then add 20 g of glutaraldehyde to it to obtain a functional medi...
Embodiment 2
[0047] (1) Dissolve 1 g of carboxymethyl cellulose in 120 g of distilled water, add 1 g of sodium chloride and 1 g of superfine calcium carbonate, and stir to obtain an aqueous phase; mix 2 g of methyl acrylate, 6 g of ethyl acrylate , 2 g vinyl acetate, 0.8 g N, N-dimethylacrylamide, 0.15 g dibenzoyl peroxide, 12 g promethazin and 22 g methyl ethyl ketone were mixed evenly to obtain an oil phase; the water phase was transferred into the reaction In the bottle, introduce the oil phase while stirring, then stir at a speed of 650 r / min for 20 minutes, and at the same time pass nitrogen gas to remove the air in the reaction bottle; heat up to 70 ° C, under nitrogen protection and a constant speed of 350 r / min Polymerize under stirring for 3 h, and filter to obtain the microspheres with 30% promethazine drug loading.
[0048] (2) Dissolve 40 g of poly(acrylamide-acrylic acid), 2 g of xanthan gum, and 1 g of polyvinyl alcohol in 1000 g of water to prepare a dilute solution, and the...
Embodiment 3
[0052] (1) Dissolve 1 g of hydroxyethyl cellulose in 120 g of distilled water, add 0.5 g of sodium chloride and 1 g of superfine kaolin, and stir to obtain an aqueous phase; mix 3 g of methyl methacrylate, 3 g of ethyl acrylate ester, 4 g butyl acrylate, 1.2 g polyethylene glycol diacrylate, 0.18 g benzoyl peroxide, 12 g bensulfuron-methyl, and 18 g methyl ethyl ketone were mixed evenly to obtain an oil phase; the water phase was transferred into a reaction flask In the process, introduce the oil phase while stirring, and then stir at a speed of 680 r / min for 25 minutes, and at the same time pass nitrogen gas to remove the air in the reaction flask; heat up to 75 ° C, under nitrogen protection and constant speed stirring at 380 r / min Polymerize for 3.5 h, and filter to obtain microspheres with 30% drug loading.
[0053] (2) Dissolve 3 g of xanthan gum, 20 g of polyacrylamide, and 20 g of polyacrylic acid in 1000 g of water to prepare a dilute solution, and then add 12 g of gly...
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