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Preparation method of sustained and controlled release coated material from polymer micro-nano particles employing embedding method

A coating material and polymer technology, which is applied in the field of polymer micro-nanoparticle embedding method to prepare slow and controlled release coating materials, can solve the problems of inaccurate control, uneven particle size of inorganic minerals, etc., and achieve good film-forming properties Effect

Active Publication Date: 2014-01-01
邢长民
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particle size of inorganic minerals is not uniform, and the process of dissociation in the soil to form microporous channels is random and cannot be precisely controlled.
So far, there is no report on the precise control of the porosity and slow-release performance of the coating by adding various micro-nano particles with uniform particle size

Method used

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  • Preparation method of sustained and controlled release coated material from polymer micro-nano particles employing embedding method
  • Preparation method of sustained and controlled release coated material from polymer micro-nano particles employing embedding method
  • Preparation method of sustained and controlled release coated material from polymer micro-nano particles employing embedding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] (1) Preparation of reaction solution: 10% maleic anhydride, 12% vinyl acetate, 0.5% benzoyl peroxide, 3.5% hydroxypropyl cellulose, and butyl acetate as solvent; Nitrogen deoxygenation for 20min; Water bath Polymerization was initiated by heating at a temperature of 75°C for 150 minutes; the reaction product was separated with a centrifuge at 3000 rpm, washed three times with butyl acetate, and redispersed in butyl acetate by ultrasonic vibration to obtain a dispersion system of polymer micro-nano particles;

[0061] (2) Preparation of polymer solution: 8% ethylene-vinyl acetate copolymer, 2% polyvinyl acetate, dissolved in butyl acetate, temperature 95°C, stirring speed 800rpm, time 150min;

[0062] (3) Preparation of complex solution: polyvinylpyrrolidone (number average molecular weight 45000) 15%, dissolved in butyl acetate, temperature 80°C, stirring speed 850rpm, time 120min; complex manganese, iron, zinc, α-naphthalene Acetic acid, auxin, Avermectin;

[0063] (4...

Embodiment 2

[0066] (1) Preparation of reaction solution: 25% maleic anhydride, 25% methyl acrylate, 1% azobisisobutyronitrile, 4% dextrin, and isoamyl acetate as solvent; Nitrogen deoxygenation for 60 minutes; Water bath heating Initiate the polymerization reaction at a temperature of 45°C and a time of 240 minutes; the reaction product is separated by a centrifuge at 1000 rpm, washed 5 times with isoamyl acetate, and redispersed in isoamyl acetate by ultrasonic vibration to obtain a dispersion system of polymer micro-nano particles ;

[0067] (2) Preparation of polymer solution: ethylene-vinyl acetate copolymer 12%, polymethyl methacrylate 4%, dissolved in isoamyl acetate, temperature 150°C, stirring speed 1000rpm, time 60min;

[0068] (3) Preparation of complex solution: polyvinylpyrrolidone (number average molecular weight 58000) 10%, dissolved in isoamyl acetate, temperature 100°C, stirring speed 400rpm, time 60min; complex boron, selenium, auxin, Jinggang Mycin, Wuyiencin;

[0069]...

Embodiment 3

[0072] (1) Preparation of reaction solution: maleic anhydride 0.5%, styrene 0.5%, cumene hydroperoxide 0.05%, polyethylene glycol 0.5%, methyl benzoate as solvent; Nitrogen deoxygenation 10min; Water bath Polymerization reaction is initiated by heating at a temperature of 120°C for 30 minutes; the reaction product is separated at 2500 rpm by a centrifuge, washed 4 times with methyl benzoate, and redispersed in methyl benzoate by ultrasonic vibration to obtain a dispersion of polymer micro-nano particles system;

[0073] (2) Preparation of polymer solution: ethylene-vinyl acetate copolymer 15%, polystyrene 5%, dissolved in methyl benzoate, temperature 120 ° C, stirring speed 1000 rpm, time 240 min;

[0074] (3) Prepare complex solution: polyvinylpyrrolidone (number average molecular weight 36000) 15%, be dissolved in methyl benzoate, temperature 75 ℃, stirring speed 1000rpm, time 180min; Complex calcium, iron, copper, zinc, Gibberellin, abscisic acid, Jinggangmycin, artesunate...

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Abstract

The invention relates to a preparation method of a sustained and controlled release coated material, and particularly relates to a method for preparing a sustained and controlled release coated material from polymer micro-nano particle employing an embedding method. The method comprises the following steps: preparing the polymer micro-nano particles; dissolving environment-friendly biodegradable polymers and blending polymer alloy thereof; dissolving polyvinylpyrrolidone and microelements complexed by polyvinylpyrrolidone and drugs; mixing disperse systems obtained in the previous steps; atomizing, spraying and drying the surface of a granulated fertilizer. The method for preparing the sustained and controlled release coated material is simple and convenient in technology; the used solvent is low in toxicity and can be recycled; regulation and control of the porosity and the slow controlled release performance of a capsule are achieved by adding the polymer micro-nano particles with even grain sizes.

Description

technical field [0001] The invention relates to a preparation method of a sustained and controlled release coating material, in particular to a method for preparing a slow and controlled release coating material by embedding polymer micro-nano particles. Background technique [0002] Slow / controlled release fertilizer changes the release characteristics of fertilizer nutrients through a layer of coating material on the surface of granular fertilizer, prolongs or controls the release of fertilizer nutrients, and coordinates the release of nutrients with the law of crop fertilizer requirements. [0003] The slow-release mechanism of slow / controlled-release fertilizers to nutrients is a rupture mechanism and a diffusion mechanism. Inorganic coated fertilizers, taking sulfur-coated urea as an example, the slow-release process of nutrients in the soil is as follows: the gradual conversion of polymeric sulfur and amorphous sulfur into crystalline sulfur leads to cracks in the sulf...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/08C05G3/90
Inventor 邢长民王辉
Owner 邢长民
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