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Anti-powdering and anti-caking agent for urea

An anti-caking agent, urea technology, applied in the direction of urea compound fertilizer, nitrogen fertilizer, fertilizer mixture, etc., can solve the problems of insufficient urea strength, large dosage, dust, etc., and achieve the effect of simple preparation process and increased strength

Inactive Publication Date: 2005-08-03
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pulverization phenomenon of urea when it is stacked and cooled in the bulk warehouse may be caused by the insufficient strength of urea at higher temperatures. At present, there are domestic reports on the addition of inorganic anti-caking agents. The inorganic fillers used include diatomaceous earth and bentonite. Sodium, bentonite calcium, kaolin, zeolite, etc., inorganic fillers are adsorbed on the surface of urea particles, and prevent caking by isolation. Although there is a certain effect, the amount of excessive inorganic fillers will also cause dust.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 63.5% deionized water into the reaction kettle, slowly add 6% polyvinyl alcohol 17-88 under low-speed (100 rpm) stirring, stop stirring after adding, soak (30-60) minutes; heat with steam , Stir and gradually raise the temperature to 60°C to completely dissolve the polyvinyl alcohol 17-88. After cooling to below 40°C, add 15% sodium lauryl sulfate, 15% acetone, 0.2% salicylic acid preservative and 0.3% tributyl phosphate in turn, stir evenly and filter to obtain urea anti-powdering and anti-caking agent.

Embodiment 2

[0021] Urea anti-powdering and anti-caking agent is composed of polyvinyl alcohol 17-99, sodium lauryl triethanolamine sulfate, isopropanol, salicylic acid, silicone emulsion and water, and their weight percentage is polyvinyl alcohol 17 -99 5.5%, Sodium Lauryl Triethanolamine Sulfate 15%, Isopropanol 10%, Salicylic Acid 0.3%, Silicone Emulsion 0.2%, Water 69%. Its preparation method is basically the same as that of Example 1, except that the components and proportioning ratio are different.

Embodiment 3

[0023] Urea anti-powdering and anti-caking agent is composed of polyvinyl alcohol 10-88, sodium lauryl sulfate, ethanol, octanol, benzoic acid and water, and their percentages by weight are polyvinyl alcohol 10-88 1%, ten Dialkyl sodium sulfate 22%, ethanol 25%, octanol 1%, benzoic acid 1%, water 50%. Its preparation method is basically the same as that of Example 1, except that the components and proportioning ratio are different.

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PUM

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Abstract

The present invention relates to powdering and caking resisting agent for urea. The powdering and caking resisting agent for urea consists of polymer 1-20 wt%, surfactant 2-25 wt%, viscosity regulator 2-25 wt%, defoaming agent 0.05-1 wt%, preservative 0.05-1 wt% and water 50-90 wt%. The powdering and caking resisting agent for urea can prevent urea from caking and powdering effectively, has small use amount, and has no harm to soil, plant, animal and environment.

Description

technical field [0001] The invention belongs to the field of chemical fertilizer additives, and in particular relates to an anti-pulverization and anti-caking agent for urea. Background technique [0002] At present, domestic urea generally has agglomeration problems in the process of transportation and storage, which seriously affects the appearance of the product, brings difficulties to market sales, and brings inconvenience to users. The amount of material is large, and it is of great significance to solve the above problems. [0003] The agglomeration of urea is considered to be caused by the recrystallization process on the surface of urea particles. First, the moisture inside the urea particles migrates to the surface of the particles or the urea absorbs moisture in the air, forming a thin water layer on the surface of the particles. When the temperature changes , the water absorbed on the surface will evaporate again, and the "liquid bridge" of the saturated solution...

Claims

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Application Information

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IPC IPC(8): C05C9/00C05G3/10C05G3/90
Inventor 柯汉中皮振邦田熙科
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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