2,4-D polyamidine as well as preparation method and application thereof
A 4-D, reaction technology, applied in the field of weeding, can solve the problems of strong volatility, easy diffusion and drift, poor product quality, etc., and achieve the effect of simple preparation method and environmental friendliness
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Embodiment 1
[0029] The synthesis of embodiment 1 polyamidine
[0030]
[0031] In a four-neck flask, add 42 mL of N-ethylene formamide, 40 mL of acrylonitrile and 420 mL of deionized water. Bubble nitrogen into the mixture and stir for 30 minutes. The temperature was raised to 60°C, and the AAPH aqueous solution was injected. The temperature was lowered to 45°C for 4 hours, and then raised to 60°C for 3 hours. Aqueous hydrochloric acid solution (102 mL concentrated hydrochloric acid + 240 mL deionized water) was added, and the temperature was raised to 100° C. for more than 4 h. When the measured solid content of the reaction solution was 8.7%, the reaction was stopped to obtain a polyamidine solution. An appropriate amount of NaOH aqueous solution is fully settled to obtain a white precipitate, and deionized water is dialyzed to remove salt, and a white solid is obtained to obtain a polyamidine.
Embodiment 2
[0033]
[0034] Table 1 Preparation of 2,4-D polyamidine preparations by dissolution method
[0035]
[0036] The polyamidine hydrochloride aqueous solution is neutralized with NaOH solution, and the 2,4-D solution is added, both steps are prone to white sedimentation. Ethanol-water as solvent: the amount of incompatibility is related to the dispersion of stirring and the amount of solvent. It is easy to form a uniform solution by changing the order of addition. DMF-water is the solvent: a small amount of DMF will appear turbid, and a large amount will be clear. The solution has a high viscosity. Acetone-water is the solvent: the solution is clear with a large amount of acetone, and the solution viscosity is low.
[0037] The 2,4-D polyamidine solution prepared above is spin-dried to obtain a solid preparation, which is then ground and sieved to prepare powder preparations with different meshes.
Embodiment 3
[0039]
[0040] The sediment is dried to obtain a solid preparation, which is then ground and sieved to prepare powder preparations of different meshes.
[0041] Table 2 Preparation of 2,4-D preparations by sedimentation method
[0042]
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