Medium trace element compound fertilizer containing vitamin B and preparation method thereof
A technology of medium and trace elements, compound fertilizer, applied in the direction of organic fertilizer, fertilizer mixture, fertilization device, etc.
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[0111] Another aspect of the present invention provides a method for preparing a trace element compound fertilizer containing vitamin B, the method comprising the following steps:
[0112] (1) Immerse oligochitosan with a weight-average molecular weight of 3000 to 50000 parts by weight in 2V2vt% acetic acid solution and 2V5wt% hydrogen peroxide solution;
[0113] (2) Dissolving piperazine diketo acid in 10V methanol in parts by weight and adding it to the oligochitosan solution obtained in step (1) to obtain a reaction liquid;
[0114] (3) The reaction solution obtained in the step (2) is adjusted to neutral pH with 10wt% NaOH aqueous solution and then filtered, and the retentate is soaked, washed, filtered and dried;
[0115] (4) Disperse the oligomeric chitosan piperazine diketoamide synthesized in the step (3) in acetone, add 20wt% NaOH aqueous solution for alkalization, and then add abscisic acid and salicylic acid in parts by weight , Carry out the grafting reaction, and finally ...
Embodiment 1
[0124] (1) Grafting piperazine diketo acid onto oligomeric chitosan
[0125] In a 1000ml three-necked flask, add 50g of oligochitosan with a weight average molecular weight of 20000, 100ml of 2vt% acetic acid solution, 100ml of 5wt% hydrogen peroxide solution, stir, completely dissolve and keep it at 55℃ for 5h; after the reaction is complete , Add piperazine diketo acid (1g) dissolved in 10ml methanol, stir and react for 12h at room temperature to obtain the reaction liquid; adjust the pH of the reaction liquid to neutral with 10wt% NaOH aqueous solution, filter, and soak in 200ml acetone for 10h , Wash with 50ml acetone, filter, and dry under reduced pressure at 40°C for 12h.
[0126] (2) Graft abscisic acid and salicylic acid on the oligomeric chitosan modified with piperazinone diacid
[0127] In a 1000ml three-necked flask, add synthetic oligomeric chitosan piperazine diketoamide, 300ml acetone, 100ml 20wt% NaOH aqueous solution, basify at 50℃ for 3h, then add 1.5g abscisic aci...
Embodiment 2~6
[0132] The preparation method is the same as in Example 1, except that the type of vitamin B is different;
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