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Bio-based slow/controlled-release coated nano cemented granulated fertilizer and preparation method thereof

A nano-cementation and bio-based technology, applied in the direction of layered/coated fertilizers, inorganic fertilizers, fertilizer mixtures, etc., can solve the problems of restricting wide application, high price, and difficult to achieve green food products, so as to solve the problem of raw material sources and reduce The effect of raw material costs

Inactive Publication Date: 2021-02-26
SOUTH SUBTROPICAL CROPS RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the long-term application of chemical fertilizers in most areas of my country, the soil ecological environment, soil physical and chemical properties, and soil microbial flora have been damaged to varying degrees. Fertility supply capacity has declined, soil compaction has intensified, and the dominant population of rhizosphere soil microorganisms has decreased significantly, which has polluted the quality of agricultural products to a certain extent, making it difficult for products to meet the requirements of green food
[0003] According to statistics, the role of chemical fertilizers in increasing crop yields accounts for 40%-60%. my country is a country with a large production capacity of chemical fertilizers and a large consumption of chemical fertilizers, but the average utilization rate of chemical fertilizers in the current season is less than 40%.
However, the complex process and high-cost raw materials of the coating material make it expensive. At present, it can only be used on lawns and flowers with economic value, and it cannot be widely promoted; another main reason is the controlled release of the coating. The residual film of fertilizer cannot be degraded and will cause secondary pollution to the environment, thus limiting its wide application in the agricultural field
At the same time, many coated fertilizers are now coated directly on the surface of traditional fertilizer particles, and the controlled release is only achieved through the film, which makes the controlled release effect unsatisfactory and cannot achieve the effect of precise regulation of crop nutrients.

Method used

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  • Bio-based slow/controlled-release coated nano cemented granulated fertilizer and preparation method thereof
  • Bio-based slow/controlled-release coated nano cemented granulated fertilizer and preparation method thereof
  • Bio-based slow/controlled-release coated nano cemented granulated fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Preparation of nano fertilizer

[0040] Put 100g of halloysite nanotubes and 7g of urea into a ball milling reactor with a capacity of 1L, put 10 ceramic balls with a particle size of 1.8cm in the reactor, close the ball mill for 5 hours, and wash with isopropanol after the ball milling , until the unintercalated urea is washed away, and then dried to obtain the urea-intercalated nano-fertilizer;

[0041] figure 1 It is the SEM figure of the halloysite nanotube before the present embodiment intercalation; figure 2 It is the SEM figure of the halloysite nanotube after the intercalation of the present embodiment.

[0042] (2) Preparation of granular fertilizer

[0043] Get 200g of nano-fertilizer, put it into a disc granulator, rotate continuously, and spray a polyvinyl alcohol solution (bonding agent) with a mass concentration of 0.1% on the surface of the nano-fertilizer, thereby rotating to form fertilizer particles, and put it drying in a blast drying at 70°C...

Embodiment 2

[0052] (1) Preparation of nano fertilizer

[0053] Put 100g of montmorillonite and 10g of potassium dihydrogen phosphate into a ball milling reactor with a capacity of 1L, put 10 ceramic balls with a particle size of 1.8cm in the reactor, and seal the ball mill for 5 hours. Wash until the unintercalated potassium dihydrogen phosphate is washed away, and then dry to obtain the intercalated nano-fertilizer of potassium dihydrogen phosphate;

[0054] (2) Preparation of granular fertilizer

[0055] Get 200g nano-fertilizer, put into disc granulator, rotate continuously, spray mass concentration is 2% chitosan (bonding agent) on the surface of nano-fertilizer, thereby rotate and form fertilizer granule, it is placed on drying in blast drying at 70°C to obtain fertilizer granules, wherein the amount of binder added is 10% of the weight of the natural nano-clay material;

[0056] (3) Preparation of coating agent

[0057] Grind 80g of wheat straw, pass through a 30-mesh sieve, mix ...

Embodiment 3

[0063] (1) Preparation of nano fertilizer

[0064] Put 100g of mesoporous silica and 20g of potassium chloride into a ball milling reactor with a capacity of 1L, put 10 ceramic balls with a particle size of 1.8cm in the reactor, and seal the ball mill for 5 hours. After the ball milling, use isopropanol Wash until the unintercalated potassium chloride is washed away, and then dry to obtain the nano-fertilizer of potassium chloride intercalation;

[0065] (2) Preparation of granular fertilizer

[0066] Get 200g nano-fertilizer, put into disc granulator, rotate continuously, spray mass concentration is 1% xanthan gum (binder) on the surface of nano-fertilizer, thereby rotate to form fertilizer granule, put it on drying in blast drying at 70°C to obtain fertilizer granules, wherein the amount of binder added is 35% of the weight of the natural nano-clay material;

[0067] (3) Preparation of coating agent

[0068] Grind 100g of corn stalks, pass through a 30-mesh sieve, mix it ...

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Abstract

The invention discloses a bio-based slow / controlled-release coated nano cemented granulated fertilizer and a preparation method thereof, and belongs to the technical field of fertilizer preparation. The preparation method comprises the following steps: (1) grinding and mixing a natural nano-clay material and a chemical fertilizer to form a nano-fertilizer; (2) uniformly mixing an agricultural straw liquefied product with an isocyanate compound according to a molar ratio of 1: (0.5-0.8) to prepare a coating agent; and (3) granulating the nano-fertilizer by using a binder to form fertilizer particles, spraying the coating agent prepared in the step (2) onto the surfaces of the fertilizer particles, and carrying out coating and curing to prepare the bio-based slow / controlled-release coated nano cemented granulated fertilizer. The bio-based slow / controlled-release coated nano cemented granulated fertilizer prepared by the method is good in biodegradability, rich in raw material source, lowin cost and good in slow-release effect.

Description

technical field [0001] The invention relates to the field of fertilizer preparation, in particular to a bio-based slow-release coated nano-cemented granulated fertilizer and a preparation method thereof. Background technique [0002] Fertilizer is the grain of crops and an indispensable basic means of production in agricultural production. However, due to the long-term application of chemical fertilizers in most areas of my country, the soil ecological environment, soil physical and chemical properties, and soil microbial flora have been damaged to varying degrees. Fertility supply capacity has declined, soil compaction has intensified, and the dominant population of rhizosphere soil microorganisms has decreased significantly, which has polluted the quality of agricultural products to a certain extent, making it difficult for products to meet the requirements of green food. [0003] According to statistics, the role of chemical fertilizers in increasing crop yields accounts ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/40C05G5/12C05G5/30
CPCC05B7/00C05C9/00C05D1/02C05G3/00C05G3/40C05G5/12C05G5/30C05G5/37C05D9/00
Inventor 王超李普旺杜丽清谢江辉杨子明宋书会刘运浩何祖宇周闯
Owner SOUTH SUBTROPICAL CROPS RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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