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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

Active Publication Date: 2020-06-19
内蒙古中孚明丰农业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, synthetic superabsorbent and slow-release water-retaining fertilizers have problems such as complex preparation process and refractory degradation, and have not been popularized in agriculture in practical applications.

Method used

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  • Degradable double-slow-release water-retaining fertilizer with strong water absorption and preparation method thereof
  • Degradable double-slow-release water-retaining fertilizer with strong water absorption and preparation method thereof
  • Degradable double-slow-release water-retaining fertilizer with strong water absorption and preparation method thereof

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Experimental program
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Effect test

preparation example Construction

[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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Abstract

The invention discloses a degradable double-slow-release water-retaining fertilizer with strong water absorption and a preparation method thereof. The preparation method comprises the following steps:(1) dissolving salicylic acid and a solvent in a three-neck flask, adding adipoyl chloride and an acid-binding agent into the flask by using a constant-pressure dropping funnel, carrying out a chainextension reaction process at 140-160 DEG C, and carrying out reduced pressure distillation and vacuum drying after the reaction is completed, so as to obtain an intermediate I, (2) mixing the intermediate I with acetic anhydride, adding a catalyst, reacting at 105-110 DEG C, and carrying out cooling, crystallizing, suction filtration and washing with cold water to obtain a crude product, and recrystallizing to obtain an intermediate II, (3) making the intermediate II react with guar gum at 140-160 DEG C, and carrying out melt polycondensation to obtain the product, and (4) preparing the product into a solution, adding a borax solution to form gel, and carrying out freeze-drying and crushing. The degradable double-slow-release water-retaining fertilizer with strong water absorption can beused for double slow release of salicylic acid and boric acid, and can be used as a plant fertilizer for reducing salt damage to various plants.

Description

technical field [0001] The invention relates to the technical field of slow-release water-retaining fertilizers, in particular to a degradable and strong water-absorbing double slow-release water-retaining fertilizer and a preparation method thereof. Background technique [0002] Slow-release water-retaining fertilizer is a kind of fertilizer that integrates water-retaining agent and fertilizer, and has the properties of water absorption, water retention and slow release. Because of its advantages of significantly improving the utilization rate of fertilizers and reducing irrigation frequency, it has broad application prospects in arid and water-deficient areas. However, synthetic superabsorbent and slow-release water-retaining fertilizers have problems such as complex preparation process and refractory degradation, and have not been popularized in agriculture in practical applications. Therefore, the development of process simplification and degradability of slow-release w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N37/40A01N25/10A01N55/08A01P21/00C08B37/00C09K17/32C05G3/40C05G3/70C05G3/80C05G3/00C09K101/00
CPCA01N37/40A01N25/10A01N55/08C05G3/00C09K17/32C08B37/0096C09K2101/00
Inventor 王晨邱冠钧
Owner 内蒙古中孚明丰农业科技有限公司
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