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Hydrophobic modified bio-based coated controlled-release fertilizer and preparation method thereof

A technology of controlled-release fertilizers and hydrophobic modifiers, applied in layered/coated fertilizers, fertilizer mixtures, solid/semi-solid fertilizers, etc. To solve the problems of easy hydrophilicity of the material, to achieve the degradability of the residual film, reduce the water penetration rate, and improve the hydrophobic performance

Active Publication Date: 2022-01-04
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

[0004] The purpose of the present invention is to provide hydrophobically modified bio-based coated controlled-release fertilizer and its preparation method, which overcomes the problems in the prior art that the coating material is not easy to degrade, the membrane material is easy to be hydrophilic, and the nutrient release period of the coated fertilizer is relatively short.

Method used

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  • Hydrophobic modified bio-based coated controlled-release fertilizer and preparation method thereof
  • Hydrophobic modified bio-based coated controlled-release fertilizer and preparation method thereof
  • Hydrophobic modified bio-based coated controlled-release fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Step 1, mixing 20g bagasse liquefied polyol and 40g isophorone diisocyanate evenly to obtain coating solution A;

[0042] Step 2: Mix 10 g of coating solution A prepared in step 1 with 1 g of γ-aminopropyltriethoxysilane, stir evenly at room temperature, and react for 1 hour to obtain coating solution B;

[0043] Step 3: Preheat 1 kg of urea granules at 50°C for 10 minutes, spray 30 g of coating solution B (accounting for 3% of the mass of urea granules) onto the surface of urea granules, coat at 50°C for 20 minutes, and cure at 70°C 8min to obtain coated controlled-release fertilizer.

[0044] The coated controlled-release fertilizer was characterized by SEM, and its SEM picture is shown in figure 1 , it can be seen from the figure that after the coating material is hydrophobically modified, the surface of the prepared coated controlled-release fertilizer is smooth and dense, and the surface has no pores.

[0045] The coating material obtained from coating solution B...

Embodiment 2

[0048] Step 1, mix 20g bagasse liquefied polyol and 40g PM-200 evenly to obtain coating solution A;

[0049]Step 2: Mix 10 g of the coating solution A prepared in step 1 with 2 g of 3-aminopropyltrimethoxysilane, stir evenly at room temperature, and react for 1 hour to obtain the coating solution B;

[0050] Step 3: preheat 1 kg of urea granules at 70°C for 8 minutes, take 50 g of coating solution B (accounting for 5% of the mass of urea granules) and spray on the surface of urea granules, coat at 75°C for 10 minutes, and cure at 60°C 10min to obtain coated controlled-release fertilizer.

[0051] The coating material obtained from coating solution B was tested for hydrophobicity, and the contact angle is shown in image 3 , when water contacts the hydrophobically modified membrane material, the membrane material can increase the contact angle between water and the membrane layer, the contact angle is 136.76°, showing excellent hydrophobic effect.

Embodiment 3

[0053] Step 1, mixing 20g bagasse liquefied polyol and 30g diphenylmethane diisocyanate evenly to obtain coating solution A;

[0054] Step 2: Mix 10 g of the coating solution A prepared in step 1 with 1.5 g of 3-(2,3-glycidoxy)propyltrimethoxysilane, stir evenly at room temperature, and react for 1 hour to obtain the coating solution B;

[0055] Step 3: Preheat 1 kg of urea granules at 60°C for 9 minutes, spray 80 g of coating solution B (accounting for 8% of the mass of urea granules) onto the surface of urea granules, coat at 60°C for 15 minutes, and cure at 65°C 5min to obtain coated controlled-release fertilizer.

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Abstract

The invention discloses a hydrophobic modified bio-based coated controlled-release fertilizer and a preparation method thereof, and belongs to the technical field of fertilizer preparation. According to the coated controlled-release fertilizer, fertilizer particles serve as a core material, bagasse liquefied matter serves as a raw material, bagasse-based polyurethane with hydrophobic performance is prepared through modification of a silane coupling agent and reaction with isocyanate, and then the fertilizer particles are coated to prepare the hydrophobic bio-based coated fertilizer. The coated controlled-release fertilizer prepared by the method has surface hydrophobicity, and can reduce the rate of dissolving the core fertilizer by moisture through a membrane layer material, so that the nutrient release period is controlled, and the improvement of the controlled-release performance of the bio-based coated fertilizer is realized.

Description

technical field [0001] The invention relates to the technical field of fertilizer preparation, in particular to a hydrophobically modified bio-based coated controlled-release fertilizer and a preparation method. Background technique [0002] During the planting of crops, excessive and unreasonable application of chemical fertilizers can easily cause most of the fertilizers to not be absorbed by crops, resulting in serious environmental pollution. The advent of coated controlled-release fertilizers provides a new way to improve fertilizer utilization. However, the complex process and high-cost raw materials of the coating material of the coated controlled-release fertilizer cause its price to be expensive. At present, it can only be used on lawns and flowers with economic value, and it cannot be widely promoted; there is also a most important The reason is that the residual film of the coated controlled-release fertilizer cannot be degraded, which will cause secondary pollut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05C9/00C05G3/40C05G3/90C05G5/12C05G5/30
CPCC05C9/00C05G3/40C05G3/90C05G5/12C05G5/37C05G5/38C05C9/005
Inventor 王超宋书会杨子明李普旺杜丽清刘运浩何祖宇周闯
Owner SOUTH SUBTROPICAL CROPS RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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