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Preparation method of slow-release fertilizer coating liquid using alkyl ketene dimers

A technology using alkyl ketene dimers and slow-release fertilizers, which is applied in the direction of solid/semi-solid fertilizers, fertilizer mixtures, layered/coated fertilizers, etc., and can solve complex production processes, long coating time, and reaction temperature Advanced problems, to achieve the effect of simple coating process, not easy to release the film, and good reactivity

Inactive Publication Date: 2020-08-04
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] These methods generally have problems such as complex production process, high reaction temperature, long coating time, high production cost, and slow coating speed.

Method used

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  • Preparation method of slow-release fertilizer coating liquid using alkyl ketene dimers
  • Preparation method of slow-release fertilizer coating liquid using alkyl ketene dimers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Evenly disperse 30kg of isocyanate and 15kg of ethylene-vinyl acetate copolymer in 150kg of ethanol, adjust the pH to 7 with ammonia water, add 1kg of sodium fatty acid, 0.5kg of polyoxyethylene octylphenol ether-10 and 10kg of alkylketene Dimer (AKD), stir 1min under 3000r / min rotating speed with high-speed shear dispersing emulsifier, make microparticle suspension, add the alkyl ketene dimer (AKD) of 20kg again, use high-speed shear under room temperature The emulsifier was stirred at 1000r / min for 5 minutes to obtain the alkyl ketene dimer (AKD) slow-release fertilizer coating solution.

[0030] Put the granular fertilizer into the fluidized bed coating machine, spray the coating agent on the rolling fertilizer particles, and ventilate and dry at the same time, until a uniform separation film is formed outside the particles, the coated fertilizer is obtained.

Embodiment 2

[0032] Disperse 25kg of ethylene-vinyl acetate copolymer evenly in 100kg of ethanol, adjust PH=6 with ammonia water, add 1kg of sodium fatty acid, 1.5kg of polyoxyethylene octylphenol ether-10 and 10kg of alkyl ketene dimer (AKD), stir 1min under the rotating speed of 3000r / min with a high-speed shearing emulsifier to obtain a microparticle suspension, then add 30kg of alkyl ketene dimer (AKD), and use a high-speed shearing emulsifier at room temperature Stir at 2000r / min for 20min to obtain an alkyl ketene dimer (AKD) slow-release fertilizer coating solution.

[0033] Put the granular fertilizer into the fluidized bed coating machine, spray the coating agent on the rolling fertilizer particles, and ventilate and dry at the same time, until a uniform separation film is formed outside the particles, the coated fertilizer is obtained.

Embodiment 3

[0035] 15kg of isocyanate is uniformly dispersed in 130kg of ethanol, and after using ammonia water to adjust PH=6.5, add 1kg of sodium fatty acid, 0.5kg of polyoxyethylene octylphenol ether-5 and 10kg of alkyl ketene dimer (AKD), and use A high-speed shearing emulsifier was stirred at a speed of 3000r / min for 2min to obtain a suspension of solid particles, and then 40kg of alkyl ketene dimer (AKD) was added, and the high-speed shearing emulsifier was used at room temperature at a speed of 1000r / min. Stir at low temperature for 20 minutes to obtain the coating liquid of alkyl ketene dimer (AKD) slow-release fertilizer.

[0036] Put the granular fertilizer into the fluidized bed coating machine, spray the coating agent on the rolling fertilizer particles, and ventilate and dry at the same time, until a uniform separation film is formed outside the particles, the coated fertilizer is obtained.

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Abstract

The invention relates to a preparation method of slow-release fertilizer coating liquid using alkyl ketene dimers. The method comprises the following steps: selecting a component A and a component D,fully mixing, adjusting the pH value to 6-7 by using ammonia water, and adding a component C and a part of a component B; stirring for 1-2 minutes at a rotating speed of 3000r / min by using a high-speed shearing dispersion emulsifying machine to prepare a particle suspension; adding the rest of the component B, and stirring for 5-20 minutes by using a high-speed shearing emulsifying machine at a rotating speed of 1000-3000r / min at room temperature to obtain an alkyl ketene dimer slow-release fertilizer coating solution; by adopting a high-speed phase inversion preparation method of adding the component B twice, an oil-in-water emulsion is formed and then converted into a water-in-oil emulsion, and the prepared slow-release fertilizer coating liquid has good toughness and combinability, canbe well coated on a fertilizer, is not easy to demould and crack, and can play a role in efficient slow release.

Description

technical field [0001] The invention provides a method for preparing a slow-release fertilizer coating material by using an alkyl ketene dimer (AKD), which belongs to the technical field of fertilizers and also belongs to the field of material science. Background technique [0002] Coated fertilizers are also called physical controlled-release fertilizers. Generally, the film-forming material is coated on the surface of fertilizer particles by spraying to form a dense film layer, which inhibits and blocks the passage of water, makes the fertilizer slowly dissolve, and delays the fertilizer nutrients from flowing out. release rate, so as to improve the slow-release performance of fertilizers. In the process, water-soluble fertilizer particles are coated with substances with low water permeability to control the entry of water. After the nutrient solution inside the fertilizer reaches saturation, the internal pressure and Under the effect of concentration gradient, it will be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/40C05G5/30C05G5/12
Inventor 翁景峥彭黎波卢合欢童庆松
Owner FUJIAN NORMAL UNIV
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