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Alginic acid envelope sustained-release urea with urease inhibiting effect and preparation method thereof

A technology of coated slow release and urease inhibition, which is applied in the direction of urea compound fertilizer, application, nitrogen fertilizer, etc., to achieve the effect of reducing loss and improving utilization rate

Active Publication Date: 2013-01-09
SHANDONG ENBAO BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many compounds that have been found to inhibit urease activity, but there are very few compounds with high efficiency, low toxicity, high quality and low price

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: get 30 kilograms of dry sea-tangles, pulverize to 20 orders, add 250 kilograms of 1% potassium carbonate solution, 70-80 ℃ of stirring and extracting 1.5 hours, cooling, filtering, obtain 220 kilograms of filtrates. Add 1 kg of polyvinyl formal to the filtrate, stir and dissolve at 40°C, adjust the pH value to 8.5 with citric acid after complete dissolution, and obtain the coating material. Add 1000 kg of urea into the coating machine, evenly spray 10 kg of coating material, dry it with hot air at 160°C instantly, and cool the fluidized bed to room temperature to obtain alginic acid coated slow-release urea with urease inhibitory effect. Dissolution experiment shows: 10 grams of ordinary urea dissolves completely in water (20 ℃) ​​time is about 5 minutes and 30 seconds, and the complete dissolution time of alginic acid coated slow-release urea of ​​the present invention is about 17 minutes and 40 seconds under the same situation, dissolves 3.2 times slower...

Embodiment 2

[0032] Embodiment 2: Get 50 kilograms of fermented kelp powder, crush to 20 mesh, add 300 kilograms of 5% sodium hydroxide solution, stir and extract at 70-80° C. for 2 hours, cool and filter to obtain 240 kilograms of filtrate, add 12 kilograms to the filtrate The alginate is stirred and dissolved at 60°C, and after complete dissolution, the pH value is adjusted to 8.5 with fulvic acid to obtain the coating material. Add 1,000 kg of urea into the coating machine, spray 50 kg of coating material evenly, dry it with hot air at 180°C instantly, and cool the fluidized bed to room temperature to obtain alginic acid coated slow-release urea with urease inhibitory effect. The dissolution experiment shows that: the complete dissolution time of 10 grams of common urea in water (20° C.) is about 5 minutes and 30 seconds, and the complete dissolution time of the alginic acid-coated slow-release urea of ​​the present invention is about 20 minutes under the same conditions, and the dissolu...

Embodiment 3

[0033] Embodiment 3: get 70 kilograms (20 orders) of fermented kelp powder, add 200 kilograms of 10% sodium hydroxide solution and 150 kilograms of 10% potassium hydroxide solution, 70-80 ℃ of stirring and extracting 2 hours, cooling, filtering, get filtrate 250 Kilogram. Add 10 kg of modified starch and 5 kg of animal glue to the filtrate, stir and dissolve at 100°C, adjust the pH value to 8.5 with sodium humate and humic acid ammonium after complete dissolution, and obtain the coating material. Add 1,000 kg of urea into the coating machine, spray 80 kg of coating material evenly, dry it instantly with hot air at 200°C, and cool the fluidized bed to room temperature to obtain alginic acid coated slow-release urea with urease inhibitory effect. Dissolution experiment shows: 10 grams of common urea dissolves completely in water (20 DEG C) time is about 5 minutes 30 seconds, and the complete dissolution time of alginic acid coated slow-release urea of ​​the present invention is ...

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PUM

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Abstract

The invention discloses alginic acid envelope sustained-release urea with a urease inhibiting effect and a preparation method thereof. The preparation method comprises the following steps of: extracting seaweed or fermented seaweed by using aqueous solution prepared from one or two of sodium hydroxide, potassium hydroxide, sodium carbonate and potassium carbonate; adding water-soluble macromolecules into the extracting solution to dissolve the macromolecules uniformly; adjusting the pH value to be 8.5 by using an organic acid to obtain an envelope material; coating the envelope material on the surfaces of urea particles uniformly; drying instantly with hot wind; and cooling to room temperature by using a fluidized bed to obtain the alginic acid envelope sustained-release urea. The alginic acid envelope sustained-release urea has the advantages of double effects of urease inhibition and sustained release, capacities of effectively improving the utilization ratio of the urea and effectively reducing the loss caused by rain erosion in soil, no toxicity and no harm, stimulation effect on the growth of plants and low price.

Description

Technical field: [0001] The invention relates to alginic acid-coated slow-release urea with urease inhibitory effect and a preparation method thereof, belonging to the technical field of fertilizer preparation. Background technique: [0002] Chemical fertilizers play an extremely important role in agriculture. According to statistics from the Food and Agriculture Organization of the United Nations, about 50% of the increase in agricultural production comes from chemical fertilizers. The utilization rate of chemical fertilizers in actual production is very low, and the utilization rate of nitrogen fertilizer represented by urea is only about 35%. The low utilization rate of chemical fertilizers has brought pollution to the agricultural production and living environment such as soil and groundwater, and also caused the increase of agricultural production costs. Therefore, research on how to improve the utilization rate of chemical fertilizers has become a hot spot. [0003] U...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00C05G3/08C05C9/00C05G3/90
Inventor 高仁升殷军港赵岩
Owner SHANDONG ENBAO BIOTECH
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