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Coated fertilizer and its preparation method

A technology for coating fertilizers and fertilizers, which is applied in fertilizer forms, fertilizer mixtures, and fertilization devices to achieve the effects of improving fertilizer utilization, urea utilization, and production costs.

Inactive Publication Date: 2003-07-23
方连明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All there are some insurmountable defectives in these prior art aspects processing and production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Take 15 parts by weight of polyvinyl alcohol, wherein n=550, slowly dissolve the polyvinyl alcohol in 40 parts by weight of water under stirring at room temperature, and then add 0.1N sulfuric acid dropwise after all the polyvinyl alcohol has been dissolved. Adjust the acidity of the solution to pH=1.5;

[0046](2) Heat the above-mentioned polyvinyl alcohol solution to 50°C, then add dropwise 1 part of formaldehyde solution by weight of formaldehyde to the solution, and react for 5 minutes to obtain a condensation product of polyvinyl alcohol and aldehyde, which is A homogeneous, transparent solution with good fluidity and stable in air;

[0047] (3) Using 0.1N sodium hydroxide solution to neutralize the condensation product to a pH of 6.2, it is still a transparent liquid;

[0048] (4) Add 1 part of 100-mesh talcum powder to the transparent liquid, and use a mechanical stirrer to mix the talcum powder and the liquid evenly to obtain a spraying liquid;

[0049] (5...

Embodiment 2

[0052] (1) Take 15 parts by weight of polyvinyl alcohol, wherein n=550, slowly dissolve the polyvinyl alcohol in 40 parts by weight of water under stirring at room temperature, after all the polyvinyl alcohol has been dissolved, add 0.1N sulfuric acid dropwise, Adjust the acidity of the solution to pH=1.5;

[0053] (2) The above-mentioned polyvinyl alcohol solution is heated to 50°C, and then 3 parts of formaldehyde solution by weight of formaldehyde are added dropwise to the solution. After 10 minutes of reaction, a condensation product of polyvinyl alcohol and aldehyde is obtained. The solution is a A uniform, transparent solution with good fluidity and stable in air;

[0054] (3) Using 0.1N sodium hydroxide solution to neutralize the condensation product to a pH of 6.2, it is still a transparent liquid;

[0055] (4) Add 1.5 parts of 100-mesh talcum powder to the transparent liquid, and use a mechanical stirrer to mix the talcum powder and the liquid evenly to obtain a spra...

Embodiment 3

[0059] (1) Take 15 parts by weight of polyvinyl alcohol, wherein n=650, slowly dissolve the polyvinyl alcohol in 40 parts by weight of water under stirring at room temperature, after all the polyvinyl alcohol has been dissolved, add 0.1N sulfuric acid dropwise, Adjust the acidity of the solution to pH=1.8;

[0060] (2) Heat the above-mentioned polyvinyl alcohol solution to 55°C, then add dropwise 5 parts of formaldehyde solution by weight of formaldehyde into the solution, and react for 18 minutes to obtain a condensation product of polyvinyl alcohol and aldehyde, which is A homogeneous, transparent solution with good fluidity and stable in air;

[0061] (3) Using 0.1N potassium hydroxide solution to neutralize the condensation product until the pH is 6.5, it is still a transparent liquid;

[0062] (4) Add 1.5 parts of 100-mesh talcum powder to the transparent liquid, and use a mechanical stirrer to mix the talcum powder and the liquid evenly to obtain a spraying liquid;

[...

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Abstract

A coated fertilizer is composed of fertilizer core and coated layer. The said fertilizer core contains chemical fertilizer, nutritive meta-element fertilizer and nutritive trace-element fertilizer. The said coated layer is the mixture of polyvinyl alcohol, aldehyde, water-insulable additive and filler. Its advantages are high utilization rate, high effect on increasing yield, and no pollution.

Description

Technical field: [0001] The present invention relates to the field of slow release fertilizers and methods for their preparation. Background technique: [0002] In recent years, many coated fertilizers have been developed, that is, an organic or inorganic material is used to slowly dissolve granular chemical fertilizers to improve the utilization rate of fertilizers. [0003] One is to coat granular chemical fertilizers with sulfur, wax or low molecular weight polymers, and the other is to coat granular chemical fertilizers with high polymers such as polyolefin resins or polyvinyl dichloride copolymers, but the amount of the former coating material Larger, the adjustment of the dissolution rate is poor. The amount of the latter coating material is small, and it is easier to adjust the dissolution rate. However, these polymer materials are difficult to be decomposed and may cause adverse effects on the environment. [0004] SU1784616 discloses a mixture of coated mineral fer...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G5/00
Inventor 方连明
Owner 方连明
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