Coated slow-release organic fertilizer and preparation method thereof

An organic fertilizer, slow-release technology, applied in layered/coated fertilizers, fertilizer mixtures, nitrogen fertilizers, etc., can solve the problems of easy peeling, poor slow-release performance, adverse effects of slow-release performance, etc., to avoid wear consumption, The effect of good protection and isolation performance

Inactive Publication Date: 2020-04-10
NANJING HANERSI BIOLOGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the outer coating of the existing coated slow-release fertilizer is easy to peel off due to mutual friction during transpo

Method used

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  • Coated slow-release organic fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0032] Example 1:

[0033] A coated slow-release organic fertilizer, which is composed of urea nuclei with a particle size of 1-5 mm and a coating. The coating is composed of an inner slow-release layer and an outer isolation layer;

[0034] The sustained-release layer includes the following components by weight percentage:

[0035] Carbon-based support 62% lamellar double metal hydroxide, 30% chitosan, 8% tung oil.

[0036] The isolation layer is made of styrene-acrylic emulsion-paraffin-phosphogypsum material.

[0037] The preparation method of carbon-based supported layered double metal hydroxide is as follows:

[0038] (1) The peanut shells are washed, dried, crushed, sieved, and then added to concentrated phosphoric acid, immersed in concentrated phosphoric acid for 10 hours, and then filtered out. The solid-liquid mass ratio of peanut shells to concentrated phosphoric acid is 1:8. Stir it in dilute hydrochloric acid for 35 minutes, then dry it, place it in a muffle furnace and hea...

Example Embodiment

[0044] Example 2:

[0045] A coated slow-release organic fertilizer, which is composed of urea nuclei with a particle size of 1-5 mm and a coating. The coating is composed of an inner slow-release layer and an outer isolation layer;

[0046] The sustained-release layer includes the following components by weight percentage:

[0047] Carbon-based support 60% layered double metal hydroxide, 35% chitosan, and 5% tung oil.

[0048] The isolation layer is made of styrene-acrylic emulsion-paraffin-phosphogypsum material.

[0049] The preparation method of carbon-based supported layered double metal hydroxide is as follows:

[0050] (1) The peanut shells are washed, dried, crushed, sieved, and then added to concentrated phosphoric acid, soaked in concentrated phosphoric acid at 60°C for 5 hours, and filtered out. The solid-liquid mass ratio of peanut shells to concentrated phosphoric acid is 1:8, add to 1% Stir it in dilute hydrochloric acid for 30 minutes, then dry it, place it in a muffle fu...

Example Embodiment

[0056] Example 3:

[0057] A coated slow-release organic fertilizer, which is composed of urea nuclei with a particle size of 1-5 mm and a coating. The coating is composed of an inner slow-release layer and an outer isolation layer;

[0058] The sustained-release layer includes the following components by weight percentage:

[0059] The carbon-based support layered double metal hydroxide 65%, chitosan 30%, tung oil 5%.

[0060] The isolation layer is made of styrene-acrylic emulsion-paraffin-phosphogypsum material.

[0061] The preparation method of carbon-based supported layered double metal hydroxide is as follows:

[0062] (1) The peanut shells are washed, dried, crushed, sieved, and then added to concentrated phosphoric acid, soaked in concentrated phosphoric acid at 60°C for 5 hours, and then filtered out. The solid-liquid mass ratio of peanut shells to concentrated phosphoric acid is 1:6, adding to 1% Stir it in dilute hydrochloric acid for 30 minutes, then dry it, place it in a m...

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Abstract

The invention provides a coated slow-release organic fertilizer and a preparation method thereof, and relates to the field of fertilizers. The organic fertilizer is composed of a urea core body with the particle size of 1-5 mm and a coating film. The coating film is composed of a slow-release layer on the inner side and an isolation layer on the outer side. The slow release layer comprises 60-90%of carbon-based loaded layered double hydroxides according to the total mass; the isolation layer is made of a styrene-acrylic emulsion-paraffin-phosphogypsum material; tests show that the slow-release performance of a fertilizer without the isolation layer is greatly reduced after stirring and mixing and the fertilizer efficiency is completely released after 16 days, while the slow-release performance of the fertilizer containing the isolation layer is not influenced by stirring and mixing, so that the isolation layer can well protect the fertilizer, and the influence of collision and abrasion on the slow-release performance of the fertilizer is avoided.

Description

technical field [0001] The invention relates to the field of fertilizers, in particular to a coated slow-release organic fertilizer and a preparation method thereof. Background technique [0002] N, P, and K in fertilizers are the three main nutrient elements necessary for crop growth and development. However, due to the soluble characteristics of today's commercial fertilizers, the release rate of N, P, and K nutrients per unit time is much greater than the absorption rate of crops. It has caused problems such as low crop nutrient utilization rate, crop quality and yield decline, waste of resources, and environmental pollution. For example, proper supply of N nutrients can promote plant growth and increase yield, but excessive and inappropriate N supply can cause nitrate accumulation in crops, which is harmful to human health. Generally, cereals and vegetable crops can only absorb about 33% of the total amount of N in fertilizers. Even the more common urea N fertilizers ha...

Claims

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Application Information

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IPC IPC(8): C05G3/40C05G5/30C05G3/00
CPCC05C9/00C05G3/00
Inventor 谢四川曹军智
Owner NANJING HANERSI BIOLOGY TECHNOLOGY CO LTD
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