Degradable double-slow-release water-retaining fertilizer with strong water absorption and preparation method thereof
A slow-release and fertilizer technology, applied in the field of double slow-release water-retaining fertilizers and their preparation, can solve the problems of refractory degradation, complicated preparation process, and lack of agricultural promotion, etc., to achieve controlled slow release, solve refractory degradation, and reduce the number of plants The effect of salt damage
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[0029] Concrete preparation process realizes by following reaction:
[0030]
[0031] Specifically, such as figure 1 with figure 2 Shown, the preparation method of a kind of degradable strong water-absorbing double slow-release water-retaining fertilizer of the present invention comprises the following steps:
[0032] (1) Salicylic acid and solvent are dissolved in the three-necked flask, and adipoyl chloride and acid-binding agent are added to the flask by using a constant pressure dropping funnel, wherein the solvent is tetrahydrofuran, and the mass ratio of salicylic acid and tetrahydrofuran is 1:1, the molar ratio of salicylic acid to adipoyl chloride is 2:1, the acid binding agent is pyridine, the molar ratio of pyridine to adipoyl chloride is (2~4):1, and the expansion is carried out at 140~160°C Chain reaction, react for 1 to 2 hours, after the reaction is completed, distill under reduced pressure and dry in vacuo to obtain intermediate I.
[0033] (2) Mix interm...
Embodiment 1
[0039] Dissolve 0.1mol salicylic acid and 13.8g tetrahydrofuran in a three-necked flask, add 0.05mol adipoyl chloride and 0.1mol pyridine using a constant pressure dropping funnel, and react at 160°C for 1 hour under the protection of nitrogen, distill under reduced pressure, vacuum Drying yields Intermediate I. Take intermediate I and acetic anhydride with a molar ratio of 1:2.3, add 0.5wt% concentrated sulfuric acid as a catalyst, heat and reflux at 110°C for 4 hours, cool and crystallize after the reaction is completed, extract, wash with cold water, and recrystallize to obtain intermediate II . Subsequently, the intermediate II and guar gum were reacted at 150°C for 6 hours at a mass ratio of 1:10 for melt polycondensation to obtain the product. The product is configured into a solution with a concentration of 0.3 wt%, and then cross-linked with 2 wt% borax solution at a volume ratio of 100:1 to form a gel, freeze-dried and pulverized to obtain a degradable strong water-a...
Embodiment 2
[0041] Dissolve 0.1mol salicylic acid and 13.8g tetrahydrofuran in a three-necked flask, add 0.05mol adipoyl chloride and 0.15mol pyridine using a constant pressure dropping funnel, and react at 150°C for 1 hour under the protection of nitrogen, distill under reduced pressure, vacuum Drying yields Intermediate I. Take intermediate I and acetic anhydride with a molar ratio of 1:2.4, add 0.5wt% concentrated sulfuric acid as a catalyst, heat and reflux at 105°C for 5 hours, cool and crystallize after the reaction is completed, extract, wash with cold water, and recrystallize to obtain intermediate II . Subsequently, the intermediate II and guar gum were reacted at 150°C for 6 hours at a mass ratio of 1:10 for melt polycondensation to obtain the product. The product is configured into a solution with a concentration of 0.3 wt%, and then cross-linked with 2 wt% borax solution at a volume ratio of 100:1 to form a gel, freeze-dried and pulverized to obtain a degradable strong water-...
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