Sustained-release adhesive, preparation method and application thereof

A binder and slow-release technology, applied in the application, nitrogen fertilizer, fertilizer mixture, etc., can solve the problems of unsatisfactory product hardness and appearance, and the nutrient release of ordinary compound fertilizer is too fast, so as to achieve convenient and fast production, improve nutrient content, granule good looking effect

Active Publication Date: 2009-02-11
KINGENTA ECOLOGICAL ENG GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is also to provide the purposes of this slow-release binder, and it is used for the production of slow-release compound (mixed) fertilizer, solves the problem such as common compound fertilizer nutrient release is too fast, product hardness appearance is not ideal etc.

Method used

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  • Sustained-release adhesive, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] According to the reaction of urea and 37% formaldehyde molar ratio U / F=1.2, 1.3, 1.4, 1.5, 1.6, the specific operation steps are as follows:

[0027] Step 1: Add water and weighed urea to the reaction kettle, stir to dissolve, adjust pH with borax and potassium hydroxide: 9, add 37% formaldehyde solution in molar ratio, stir and react at 80°C, after 0.5 hours ;

[0028] The second step: add oxidized starch whose weight is 10% of the amount of urea, stir for 15 minutes, adjust the pH of the reaction kettle solution with phosphoric acid: 4.5, continue to stir and react at 90°C with a speed of 50r / min, and after 0.5 hours, use CaO to adjust the pH to Neutral, made slow-release binder.

Embodiment 2

[0030] According to the reaction of urea and 37% formaldehyde molar ratio U / F=1.2, 1.3, 1.4, 1.5, 1.6, the specific operation steps are as follows:

[0031] The first step: add water and weighed urea to the reaction kettle, stir and dissolve, adjust the pH to 9 with borax and potassium hydroxide, add 37% formaldehyde solution in molar ratio, stir and react at 80°C, after 1 hour;

[0032] Step 2: Add oxidized starch whose weight is 10% of the amount of urea, stir for 15 minutes, adjust the pH of the reaction kettle solution to 4 with phosphoric acid, continue to stir and react at 90°C at a speed of 45r / min, and after 1 hour, adjust the pH to neutral with CaO , to prepare slow-release binders.

[0033] Table 1: Comparison of yield and activity of sustained-release agents with different U / F ratios

[0034] Numbering U / F Yield(%) Sustained release agent active AI(%) 1 1.2 92 56 2 1.3 90 68 3 1.4 86 72 4 1.5 78 65 5 1.6 69 53 ...

experiment example

[0036] The comparative test of the slow-release compound fertilizer made with the slow-release binder and the common compound fertilizer: the test crop is corn, and the variety T 3 -1, the fertilizer nutrient used N—P 2 o 5 —K 2 O is all 22-8-15, and the slow-release compound fertilizer is made of three kinds of slow-release agents with U / F=1.3, 1.4, 1.5; 4 treatments are set in the test, and each treatment is based on 1020kg / hm 2 Fertilization, repeated 3 times, the area of ​​each plot is 25m 2 (Length 6m, width 5m).

[0037] Table 2: Comparative test of fertilizer efficiency of several slow-release compound fertilizers and common compound fertilizers

[0038]

[0039] The results prove that the slow-release compound fertilizer made with the slow-release binder increases the nutrient content of the slow / controlled release compound (mixed) fertilizer, and can meet the needs of crops for medium and trace elements. The method has high pelleting rate, high fertilize...

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Abstract

The invention discloses a sustained release binder and a preparation method thereof. The sustained release binder is obtained by stirring reaction of urea, 37 percent of formaldehyde and oxidized starch at the temperature of 75 DEG C to 80 DEG C, wherein, the molar ratio of the urea and the formaldehyde is 1.2-1.6:1, and the amount of the oxidized starch is 8 to 10 percent of weight of the urea. The sustained release binder of the invention can solve the problems that common compound fertilizer nutrient releases too fast, the hardness and appearance of the product are not ideal, etc. The sustained release compound fertilizer made from the sustained release binder improves the nutrient content of sustained / controlled releases (mixed) fertilizer. In addition, the processing of the invention has the advantages of high granulation rate, high hardness of fertilizer and good granular appearance.

Description

technical field [0001] The invention belongs to the field of slow / controlled release fertilizers, in particular to a slow release binder and a preparation method thereof. Background technique [0002] Chemical fertilizers are widely used in agriculture, but the loss rate of conventional quick-acting fertilizers is as high as 30-65%, which not only increases the cost, but also brings adverse effects on the ecological environment. Slow / controlled release fertilizer can basically synchronize with crop nutrient absorption through the regulation of nutrient release rate, which can greatly increase the utilization rate of fertilizer nutrients, improve the quality of agricultural products, and reduce environmental pollution. Therefore, slow and controlled release fertilizer has become the development of fertilizer industry in the 21st century. one of the main directions. [0003] Controlled-release fertilizers are effective, but the price is high; slow-release fertilizers such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/08C05C9/00C05G3/90
Inventor 张民杨艳杨越超
Owner KINGENTA ECOLOGICAL ENG GRP
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