Preparation method of botanical herbicide water aqua
A technology of botanical herbicides, applied in the field of botanical pesticides, can solve the problems of no botanical herbicides, affecting field operation efficiency, slow powder dissolution, etc., to achieve good promotion and application prospects, good interface wettability, No pesticide residue effect
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Embodiment 1
[0024] Example 1: Preparation of 20% Herbicidal Active Fraction Water of Sapindus Sapindus Extract
[0025] The seed coat of Soappindus vulgaris is air-dried or dried at 40-60℃, pulverized, and the extraction solvent is added according to the ratio of material to liquid (the specific extraction solvent is 95% ethanol), and the extraction is immersed for 4 hours. Repeated 3 times, and the extracts are combined. Concentrate to remove the organic solvent, and then use a macroporous resin column for further separation. Use ethanol aqueous solution (the volume ratio of ethanol: water is 0:100~95:5) (specifically, use pure water, 30% ethanol aqueous solution, 50% ethanol in sequence) Aqueous solution, 70% ethanol aqueous solution and 95% ethanol aqueous solution) for gradient elution. The eluted fractions eluted with 70% ethanol aqueous solution are concentrated and freeze-dried, which is the chromatographic fraction of Sapindus extract with herbicidal activity. Weigh 20g of the chroma...
Embodiment 2
[0034] Example 2 Screening and comparison of different surfactants
[0035] Purchase different surfactants from the market for comparison, including lignin (Sunamd106), sodium dodecylbenzene sulfonate, cocoamidopropyl betaine (CAB), alkyl glycoside (APG), fatty alcohol ethylene Ether (AEO), polycarboxylate (TERSPERSE 2700), etc. are the test materials, and 20% soapberry extract water is prepared respectively. By observing the appearance, surface tension and other indicators of the preparation, optimize the screening of surfactants. The results are shown in Table 2.
[0036] Table 2 Screening comparison of surfactants
[0037]
[0038] It can be seen from Table 2 that without surfactant, the formulation will appear flocculent and the solution will become turbid. After comparing the effects of different surfactants, it was found that adding 2% sodium dodecylbenzene sulfonate, the solution looks uniform, transparent, and has good fluidity and dilution stability, which is better than o...
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