Modified polylactic acid biomatrix capsule wall material and method for preparing bimolecular structure slow-release algae-killing microcapsules
A technology of biological matrix and capsule wall material, which is applied in the fields of botanical equipment and methods, chemicals for biological control, microcapsule preparations, etc., can solve the problems of polluted environment, low utilization rate of torreya green algae disease, and short validity period. , to achieve the effect of reducing the dosage, promoting healthy development and prolonging the validity period
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Embodiment 1
[0045] Example 1: Preparation of Biomass-based Molecular Capsule Wall Material
[0046]First, weigh 15g of polylactic acid, add it into a three-necked flask with a stirrer, add 100mL of toluene to dissolve it, put it into a constant temperature water bath, add 5g of maleic anhydride and 0.15g of initiator after heating to 95°C (2, 5 -Dimethyl-2,5-di-tert-butyl-peroxy-hexane), reacted at 95°C for 2.5h under constant temperature stirring, precipitated with methanol, washed repeatedly with methanol to remove remaining maleic anhydride, and dried A maleic anhydride graft-modified polylactic acid (MPLA) was obtained. Then add 5 mL of THF solution containing 9 g of ethylenediamine to a three-necked flask equipped with a stirrer and a thermometer; completely dissolve 4.5 g of MPLA in 50 mL of THF solution, drop into the three-necked flask under stirring, and control the temperature of the reaction system for 19 ℃. After the dropwise addition is completed, keep warm for ten minutes,...
preparation example 1
[0047] Preparation Example 1: Preparation of microcapsule slow-release algicide
[0048] (1) Preparation of cinnamaldehyde-based algicidal compound
[0049] (1.1) Preparation of p-methoxycinnamaldehyde: Using 50 mL of tetrahydrofuran as a solvent, add 1 mL of p-methoxybenzaldehyde and 0.5 mL of vinyl acetate, then add 0.2 g of barium hydroxide, stir at 40 °C for 2.0 h, and filter the mixture. The organic layer in the filtrate was separated by extraction with organic solvent chloroform, and the organic solvent was removed by a rotary evaporator to obtain a solid, which was dried at 40° C. for 10 h to obtain yellow p-methoxycinnamaldehyde.
[0050] (1.2) Preparation of 2-aminobenzimidazole: Add 1moL o-phenylenediamine and 1.2moL hydrochloric acid with a mass concentration of 20% at 90°C to the reaction vessel (the reaction vessel is heated with an oil bath), and then 7 drops / min Add 1.1 mol of cyanamide solution with mass concentration of 45% dropwise into the reaction system, ...
Embodiment 2
[0054] Embodiment 2: Preparation of biomass-based molecular capsule capsule wall material
[0055] First, weigh 20g of polylactic acid, put it into a three-necked flask with a stirrer, add 120mL of toluene to dissolve it, put it into a constant temperature water bath, add 8g of maleic anhydride and 0.2g of initiator after heating to 100°C (2, 5 -Dimethyl-2,5-di-tert-butyl-peroxy-hexane), reacted under stirring at 100°C for 2h, precipitated with methanol, washed repeatedly with methanol to remove remaining maleic anhydride, and dried to obtain maleic acid Polylactic acid (MPLA) grafted with anhydride. Then add 5mL THF solution containing 10g ethylenediamine to a three-necked flask equipped with a stirrer and a thermometer; completely dissolve 4g MPLA in 70mL THF solution, drop into the three-necked flask under stirring, and control the temperature of the reaction system at 18°C . After the dropwise addition is completed, keep warm for 15 minutes, then raise the temperature to...
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