Film-coated slow-released fertilizer and preparation process thereof

A coated slow-release, fertilizer technology, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve problems such as high price, difficulty in meeting the needs of sustainable environmental development, and environmental stress

Inactive Publication Date: 2004-01-07
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] ① Expensive price: Due to its complex manufacturing process and relatively fine requirements, the amount of polymer materials added is relatively high, which is 10-15%, making its price 3-9 times that of ordinary fertilizers. Even in economically developed countries, it is difficult to bear;
[0016] ②Environmental stress: Taking Nutricote as an example again, the polymer material used in it will take 30 years to degrade, and the components of the coating material account for 10-15% of the total amount of the coating fert...

Method used

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  • Film-coated slow-released fertilizer and preparation process thereof
  • Film-coated slow-released fertilizer and preparation process thereof
  • Film-coated slow-released fertilizer and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Dissolve nitrocellulose in a mixed solvent of ethanol / ether (ethanol:ether=1:1) and prepare a 5% (weight) solution as a coating solution; apply repeatedly on the surface of the urea granular fertilizer and add it during the application process Tung oil is used as an additive; the solvent is recovered, and the nitrocellulose and tung oil form a film on the surface of the fertilizer particles to obtain a coated slow-release fertilizer. The coating accounts for 25% of the total weight, and tung oil accounts for 15% of the coating weight. Measure its release in water by high performance liquid chromatography. Such as figure 1 As shown, it is the release curve of nitrocellulose composite coated urea in pure water at 20°C, where c / c 0 It is the urea concentration at time t / the urea concentration at the time of complete release. It is found that it takes about 120 hours to release the coated urea in pure water at 20°C.

Embodiment 2

[0039] Dissolve nitrocellulose in a mixed solvent of ethanol / ether (ethanol:ether=1:4) to prepare a 2% (weight) solution as a coating solution; apply repeated coating on the surface of the urea granular fertilizer and add it during the coating process Fir oil is used as an additive; the solvent is recovered, and the nitrocellulose and cedar oil form a film on the surface of the fertilizer particles to obtain a coated slow-release fertilizer. The coating accounted for 10% of the total weight, and the cedar oil accounted for 20% of the coating weight.

Embodiment 3

[0041] Dissolve nitrocellulose in a mixed solvent of ethanol / ether (ethanol:ether=4:1) and prepare a 10% solution as a coating solution; apply repeated coating on the surface of the urea granular fertilizer; recover the solvent, and the nitrocellulose is used in the fertilizer A film is formed on the surface of the particles to obtain a coated slow-release fertilizer. The envelope accounts for 30% of the total weight.

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Abstract

The present invention relates to a coated granular slowly-releasing fertilizer and its preparation method. It is characterized by that the surface of the nitrogen granular fertilizer is covered witha layer of coated film, and said coated film is formed from nitro-cotton and tung oil as dry oil additive, and the coated film is 5%-30% of total weight and added quantity of tung oil is 0-20% of coated film weight. Its preparation method includes the following steps: dissolving the cellulose compound and its derivative for example nitro-cotton in solvent to obtain covering solution, said solventis ethyl alcohol and ethyl ether mixed solution, then coating surface of granular fertilizer with said covering solution, finally recovering solvent so as to obtain the invented coated granjlar slowly-releasing fertilizer.

Description

Technical field [0001] The invention relates to a slow-release fertilizer and a preparation method thereof, in particular to a novel environmentally-friendly coated slow-release fertilizer and a preparation method thereof. Background technique [0002] The dependence of crop growth on nutrients is a spontaneous natural process. Fertilizers are one of the most important means of production for agricultural production and the material basis for crops to exert their greatest genetic potential. The rise of the fertilizer industry has a profound impact on human survival. The replacement of farmyard manure by chemical fertilizers has played an immeasurable role in the rapid development of agriculture, agronomy, animal husbandry, and aquaculture. In recent years, with the rapid increase in population and the reduction of arable land, the contradiction between food supply and demand has intensified, making agricultural production increasingly dependent on fertilizers. All this highlights...

Claims

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Application Information

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IPC IPC(8): C05G3/00C08L1/08
Inventor 杨琥王治流程镕时周健民彭光浩
Owner NANJING UNIV
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