Hydrophilic hydrogel coated pesticide product as well as preparation method and application thereof
A hydrophilic gel and coating technology, applied in the field of pesticide pollution reduction and control, can solve the problems of high cost and long development time, and achieve the effects of controlling diffusion, promoting reduction and improving pesticide utilization efficiency.
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Embodiment 1
[0026] Add 20ml of deionized water to 1g of starch and gelatinize at 85°C for 30min under nitrogen flow. After cooling down to room temperature, neutralize about 1.07ml of acrylic acid to 70% with 5mol / L sodium hydroxide solution, and add gelatinization dropwise. In starch; dissolve about 1.10g of acrylamide into a 20% aqueous solution, and dissolve about 0.03g of N,N-methylenebisacrylamide and about 0.13g of potassium persulfate in it, and add it dropwise to the above mixed solution; then Mix about 200 μL of xylene, about 200 μL of isopropanol, about 100-300 μL of Tw-80 and 10 mg of the active ingredient acetofen in deionized water to form a stable emulsion, and add it dropwise to the above mixed solution. Raise the temperature to 70°C and react for 3 hours. After the product was freeze-dried, it was pulverized and sieved to obtain a starch-grafted hydrophilic gel-coated acetofen product. The scanning electron micrograph (SEM) of the product is as follows: figure 1 shown. As...
Embodiment 2
[0029] 5g of tapioca starch was placed in a 250mL three-necked flask, and 100mL of deionized water was added to gelatinize for 30min. Cool down to room temperature after gelatinization is complete. A certain amount of acrylic acid monomer was neutralized with an aqueous NaOH solution with a mass fraction of 5 mol / L in an ice-water bath, and the neutralization degree was 80%. Dissolve 50 mg of acetochlor in 0.2 mol / L NaOH solution, then dissolve a certain amount of acrylamide and N,N-methylenebisacrylamide in the alkaline solution of acetochlor, vortex until mixed evenly, Add the solution dropwise to the gelatinized starch and stir. A certain amount of K 2 S 2 o 8 Dissolve in deionized water, add dropwise to gelatinized starch, heat up to 70±2°C while stirring, keep warm for 3 hours, and the reaction process is carried out under the protection of nitrogen. Cool down to room temperature after the reaction. The product gel is taken out and then dried by a vacuum freeze drye...
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