The invention relates to a preparation method for
methoprene microcapsules. The preparation method comprises the following steps: firstly, carrier preparation is carried out, namely, a
polymerization reaction with a mol ratio of
succinic acid, butylene glycol and
lactic acid being 1:1:0.2-0.3 is carried out, and a carrier PBS-co-PLA is obtained; secondly,
oil phase preparation is carried out, namely, PBS-co-PLA,
methoprene and
dichloromethane are weighed with a
mass ratio of PBS-co-PLA,
methoprene and
dichloromethane being 3.5-4.5:1:10, the PBS-co-PLA carrier is dissolved in
dichloromethane, after the PBS-co-PLA is dissolved in dichloromethane fully, the methoprene
active compound is added and dissolved and an
oil phase is obtained; thirdly, water phase preparation is carried out, deionized water is measured and taken with a
mass ratio of the
oil phase to the water phase being 1:5-7, an emulsifier dispersant is added in water and dissolved and a water phase is obtained; fourthly, microcapsule preparation is carried out, namely, the oil phase is added in the water phase, an oil and water mixed
emulsion is obtained, an antifoaming agent is added, microcapsule suspension is prepared after curing,
water washing is carried out, the supernatant is removed, and a finished product is obtained after
drying. The method is simple in technology and is
environmentally friendly. The obtained methoprene microcapsules have a good form, the encapsulation efficiency is 78%, the
drug loading capacity is 50%, the effective release period is 30 days, the
drug release amount is 94%, and the methoprene microcapsule is an ideal
pesticide sustained
release agent.