Preparation method of salicylic acid nano-microcapsule slow-release agent for resisting tobacco fungal diseases
A technology of nano-microcapsules and fungal diseases, applied in botany equipment and methods, fungicides, biocides, etc., can solve the problems of large dosage, frequent application of pesticides, and environmental pollution of organic solvents
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Embodiment 1
[0022] A preparation method of a salicylic acid nano-microcapsule slow-release agent for resisting tobacco fungal diseases, comprising the following steps:
[0023] 1) Dissolve 4 g of sodium dodecylbenzene sulfonate and 3 g of polyvinyl alcohol in 80 mL of deionized water to obtain solution A. Add 50mL of triethanolamine into 100mL of ethanol solution, stir continuously to accelerate dissolution, and obtain solution B. Solution A and solution B were mixed and stirred for 30 min. After completely dissolving, add 30g of tetraethyl orthosilicate, under the condition of magnetic stirring, hydrolyze in a water bath at 80°C for 12h;
[0024] 2) After the reaction, let stand for 2 days, centrifuge at 10,000r for 20 minutes to separate the precipitate, add 5 mL of 80% hydrochloric acid aqueous solution to the precipitate, react for 2 hours, remove concentrated hydrochloric acid, wash with deionized water for 3 times, and then use ethanol to sonicate twice ; The precipitate after eth...
Embodiment 2
[0029] A preparation method of a salicylic acid nano-microcapsule slow-release agent for resisting tobacco fungal diseases, comprising the following steps:
[0030] 1) Dissolve 4 g of sodium dodecylbenzenesulfonate and 3 g of polyvinyl alcohol in 60 mL of deionized water to obtain solution A. Add 50mL of triethanolamine into 100mL of ethanol solution, stir continuously to accelerate dissolution, and obtain solution B. Solution A and solution B were mixed and stirred for 30 min. After completely dissolving, add 25g of tetraethyl orthosilicate, under the condition of magnetic stirring, hydrolyze in water bath at 80°C for 12h;
[0031] 2) After the reaction, add ethanol solution, centrifuge and separate the precipitate, wash the precipitate with ethanol solution for 3 times, and put it into a drying oven to dry at 80°C for 24 hours;
[0032] 3) Cool to room temperature, wash the solid obtained in step 2 with deionized water 3 times, and dry it in vacuum overnight to obtain nano...
Embodiment 3
[0036] A preparation method of a salicylic acid nano-microcapsule slow-release agent for resisting tobacco fungal diseases, comprising the following steps:
[0037] 1) Add 2.5g of surfactant sodium dodecylbenzenesulfonate and 3.6g of cetyltrimethylammonium bromide into 25mL of triethanolamine, add 30g of sodium silicate after completely dissolving, and stir in magnetic Under conditions, hydrolysis reaction 15h;
[0038] 2) After the reaction, add ethanol solution, centrifuge and separate the precipitate, wash the precipitate 3 times, and put it into a drying oven to dry at 80°C for 24 hours;
[0039] 3) Cool to room temperature, wash the solid obtained in step 2 with deionized water 3 times, and dry it in vacuum overnight to obtain nano-SiO 2 particle;
[0040] 4) Dissolve 2 mL of dispersant Tween-40 and 3 mL of emulsifier OP-10 in 40 mL of sterile water, mix and stir evenly, add 40 mL of 10% salicylic acid solution, and add nano-SiO 2 20g of particles, stirred at 80°C for ...
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