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Jul 23, 2021
Background technique:
Agricultural aviation plant protection is the use of planes to spray pesticides or fertilizers to prevent and control diseases, pests, and weeds in farmland, forests, and grasslands or to manage field growth. During the aerial plant protection spraying process, since the spray volume per mu is 0.5-1.5L, the dilution concentration of pesticides is about 15 times higher than that of artificial or mechanical spraying on the ground. The demand for pesticide formulations and the quality of pesticides is correspondingly increased, and special pesticides are required. The current shortage of special pesticides for agricultural aviation spraying in my country has become an important factor restricting the development of my country's agricultural aviation plant protection industry. Existing aerial plant protection operations still use pesticide emulsifiable concentrates, suspension concentrates, wettable powders, etc. for ground spraying. Among them, emulsifiable concentrates contain volatile organic compounds, which pollute the atmosphere more severely than conventional sprays during aerial spraying; particle size of wettable powders Larger, low suspension rate, it is easy to cause uneven spraying in aerial spray, high surface tension, poor wettability, and it is not easy to wet and spread on crops in aerial spray.
Technical realization elements:
In order to solve the current market lack of special aviation chemicals and conventional pesticides not suitable for aviation spraying, the present invention provides a pesticide suspension used in agricultural aviation low-volume sprays and a preparation method thereof; the suspension does not contain volatile organic compounds The compound (VOC) reduces the pollution of volatile substances to the atmosphere during the pesticide spraying process; the particle size is smaller than the conventional pesticide suspension agent, which improves the uniformity and absorption rate of the pesticide on the target surface.
In order to solve the above technical problems, the present invention provides technical solutions as follows:
On the one hand, the present invention provides an aviation low-volume spray herbicide suspension, which is composed of the following components by weight:The evaporation drift inhibitor is a mixture of polysaccharides and oils;The dispersant is a mixture of nonionic surfactants and anionic surfactants;
The non-ionic surfactant includes hydroxyl-terminated hyperbranched polyester;
The grinding aid is one or more of triethanolamine, diethanol monoisopropanolamine, and polyisopropanolamine.
Preferably, the above-mentioned aviation low-volume spray herbicide suspension is composed of the following parts by weight:
Further, the pesticide technical is a solid, the melting point is above 60°C, the solubility in water is less than 200 mg/L, and it is stable and does not decompose.
Further, the original pesticides include cyhalofop-butyl, penoxsulam, atrazine, mesotrione, nicosulfuron, flufenacet, thidiazuron, diuron, and carfentrazone One or more of ketone, quinclorac, bensulfuron-methyl, quizalofop-p-ethyl, carfentrazone, diflufenazone, and flufentrazone.
Further, the polysaccharide is one or more of cellulose, starch, glycogen, and polyfructose;
The oils are one or more of vegetable oils, methylated vegetable oils, and ethylated vegetable oils.
Further, the nonionic surfactant also includes one of stearyl alcohol polyoxyethylene ether, propylene glycol block polyether, allyl alcohol polyether, polyoxyethylene oleate, and polyoxyethylene laurate. Or multiple
The anionic surfactant is one or more of sodium polycarboxylate, sodium lignosulfonate, fatty alcohol polyoxyethylene ether sodium sulfate, sodium isooctyl sulfate, and sodium n-decyl sulfate.
In the present invention, the surfactant adopts a hydroxyl-terminated hyperbranched polyester nonionic surfactant, and one of the remaining nonionic surfactants is mixed with an anionic surfactant, so that the prepared pesticide composition has better wetting Effect.
Preferably, the wetting agent is tridecyl alcohol ether, sodium ditridecyl sulfosuccinate, sodium dibutyl naphthalene sulfonate, alkyl naphthalene sulfonate condensate, trisiloxane One or more.
Preferably, the defoamer is a silicone defoamer and/or a polyether defoamer;
The binder is one or more of gum arabic, acrylate, acrylic modified alkyd resin, and vinyl acetate/acrylate copolymer. It should be noted that all defoamers commonly used by those skilled in the art can be used in the present invention.
In order to verify that the present invention has a synergistic effect on pesticide drone spraying in the field, the above-mentioned Example 3, 10% cyhalofop-butyl EC and comparative examples 1-4 were used to conduct field efficacy tests for the prevention and treatment of sardines. Dilute 10 times with water. Using DJI MG-1 plant protection drone as spraying equipment, mixing and mixing uniformly for spraying, spraying rate: 0.30L/min, operating flight speed: 5m/s, flying height 2 meters above the top of the ground rice field, and the wind speed is The pesticides were applied under breeze conditions of 3.6～5.2m/s, and the field efficacy test was carried out according to the "Criteria for Field Efficacy Tests". The control effects are shown in Table 3.
It can be seen from the above table that the suspending agent prepared by the present invention has a higher control effect than that of the suspending agent prepared in Comparative Examples 1-4 at 3 days, 7 days and 14 days after administration, and compared with 10% cyanofluoride. The grass ester emulsifiable concentrate, the aviation low-volume spray herbicide suspension prepared by the invention has a better effect of preventing and controlling diseases and insect pests.
In summary, the aviation low-volume spray herbicidal suspension of the present invention has simple preparation and use methods. Under the combined action of multiple additives, the suspension has no volatile organic solvents, has a smaller particle size than conventional suspensions, and has a surface It has the advantages of low tension, and it is easy to wet, adhere and deposit on the surface of the crop, thereby increasing the number of droplets reaching the target and improving the efficacy of the medicine.
The above are the preferred embodiments of the present invention. For those of ordinary skill in the art, without departing from the principle of the present invention, making several improvements and modifications should also be regarded as the protection scope of the present invention.