Environment-friendly slow-release micro-capsule suspension agent and preparation method thereof

Abstract

The invention relates to an environment-friendly slow-release micro-capsule suspension agent and a preparation method thereof. The environment-friendly slow-release micro-capsule suspension agent is prepared from 25-28% of capsule core material (1), 8-12% of floating catalyst (2), 1-2% of dispersing agent (3), 45-50% of thinning agent (4), 5-8% of capsule skin material (5), 0.2-0.4% of thickeningagent (6), 0.05-0.15% of sourness conditioning agent (7), 0.2-0.5% of anti-coagulating agent (8), 0.05-0.15% of regulation additive (9), 0.05-0.15% of defoaming agent (10) and 4-7% of anti-freezing agent (11) according to a proportion. Automatic production is carried out on a special production line under the operation of an intelligent control system. According to the invention, the environment-friendly slow-release micro-capsule suspension agent does not contain organic solvent components, such as dimethylbenzene and the like, so that chemical injury caused by pesticide volatilization can be avoided, and the environmental pollution can be reduced; because the efficacy duration is increased, the dosage is reduced by half, the efficacy is doubled, and weed damage can be controlled for a long time; the concentration of pesticides contacted by crops is reduced, so that the safety is increased; and in addition, the environment-friendly slow-release micro-capsule suspension agent has the advantages of being automatic for production in the preparation process, time-saving, labour-saving, good in quality, low in cost, high in production efficiency and good in economical benefit.

Description

technical field [0001] The invention relates to a herbicide pesticide, in particular to a water-based pre-emergent herbicide and a production process thereof. Background technique [0002] Since the Ministry of Industry and Information Technology announced that it would not accept the production license of pesticide emulsifiable concentrate products, the dosage forms of pesticide products have been diversified, among which microemulsions, water emulsions and microcapsule suspensions can replace emulsifiable concentrate pesticide products, but microemulsions and water emulsions are due to processing To meet the needs of the process, toxic solvents such as toluene and xylene must be used in production, and only microcapsule suspensions can achieve water-based production. Existing microcapsule encapsulation techniques include the following: (1) interfacial polymerization method, which is to dissolve the active substance and suitable macromolecular capsule wall monomer in a wat...

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Problems solved by technology

(3) Agglomeration method, which is the reaction between a cationic polymer solution containing pre-dispersed active substances and another polymer solution with opposite electric harshness. In the coagulation stage, the wrapping material must completely wrap the capsule core material to form a soft-shell capsule. This process is difficult to control

(4) Spray drying of microcapsule suspension to make microcapsule granules is to spray-dry the slurry containing active substances and polymers, so that the polymers form a capsule wall around the solid capsule core particles, and the encapsulated granules are redispersed It can still be restored to its original state in water, but the particle size is larger

(5) The molecular embedding method uses β-cyclodextrin as the coating material to form microcapsules at the molecular level, which has low hygroscopicity, is easy to store, and is biodegradable, but it is costly, difficult, and long-term

The production of microcapsule suspension by the above process method has the following disadvantages: because the active ingredient is wrapped by the encapsulation material, the encapsulation rate cannot be effectively controlled, the drug effect will be reduced, and the expected effect cannot be reached; The physical and chemical selection of the original drug is relatively harsh; the production process will cause pollution to the environment; the long-term storage stability is not good; the particle size distribution is uneven; the release rate is unstable, etc.

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