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Aqueous polymer coated controlled release fertilizer and preparation thereof

A technology of water-based polymers and controlled-release fertilizers, applied in layered/coated fertilizers, fertilizer mixtures, fertilization devices, etc., can solve the problems of not completely eliminating the hazards of organic solvents, and achieve excellent controlled-release performance, non-toxic and pollution-free The effect of production process and excellent mechanical properties

Active Publication Date: 2011-05-11
KINGENTA ECOLOGICAL ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1388169 and CN 1546543 disclose the method for preparing water-based polymer fertilizer coating agent with waste plastics etc. as main raw materials, this method partly overcomes the shortcoming of organic solvent type polymer fertilizer coating agent, but because this method must first use part Organic solvents dissolve polymer materials such as waste plastics, and then high-speed shear emulsification technology can be used to prepare water-based polymer coating agents, so the hazards of organic solvents have not been completely eliminated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Preparation of water-based polymer composite coating agent

[0041] Using the polymerization process (A), 900 grams of water, 13 grams of sodium lauryl sulfate, 6 grams of n- Octanol and 8 g ammonium bicarbonate, stir to dissolve. Dissolve 8 grams of ammonium persulfate in 100 grams of water for use. Put 510 grams of styrene, 470 grams of butyl acrylate and 20 grams of acrylic acid into the dropping funnel and mix evenly, then add 20% of the mixed monomers into the reaction bottle, start stirring and add 60 ml after heating to about 60°C Ammonium persulfate aqueous solution, and at the same time, drop the mixed monomers from the dropping funnel at a constant speed. The rate of monomer addition was controlled to control the reaction temperature at about 85° C., and the monomer addition time was 2 hours. After dropping, the remaining 40 ml of ammonium persulfate aqueous solution was added and reacted at the reaction temperature for 4 hours. Cool to room temperatur...

Embodiment 2

[0046] (1) Preparation of water-based polymer composite coating agent

[0047] Polymerization equipment and polymerization process steps are with embodiment 1. The difference is that 300 grams of styrene, 150 grams of methyl methacrylate, 490 grams of butyl acrylate, 60 grams of acrylic acid, 10 grams of sodium lauryl sulfate, 12 grams of octylphenol polyoxyethylene ether, n-octanol 5 grams, 12 grams of ammonium persulfate, 12 grams of ammonium bicarbonate, 1000 grams of water. The monomer conversion rate of the polymerization reaction is 98.9%, the product viscosity is 58mPa.S, the particle size is 62nm, and the glass transition temperature of the polymer is 25.1°C.

[0048] Disperse 70 grams of potato starch in 300 grams of water, heat to about 75° C. for gelatinization under stirring for 1 hour, add it into the above emulsion under strong stirring and mix evenly to obtain a composite coating agent.

[0049] (2) Fertilizer coating process

[0050] 10kg particle size is th...

Embodiment 3

[0052] (1) Preparation of water-based polymer composite coating agent

[0053] Using the polymerization process (C), add 500 g of water, 2.5 g of sodium dodecylbenzenesulfonate, 2.5 g of sodium dodecyl sulfate and 4 g of polyoxyethylene sorbitan monooleate into a round bottom flask in sequence in, stir to dissolve. Mix 390 grams of styrene, 570 grams of ethyl acrylate and 40 grams of acrylic acid evenly, then add 80% of the mixed monomer into the above-mentioned round bottom flask, emulsify at a rate of 700 rpm for 45 minutes at room temperature, and the monomer The pre-emulsion was transferred to a constant pressure dropping funnel for use. Dissolve 10 grams of potassium persulfate in 100 grams of water for later use.

[0054] Add 400 g of water, 2.5 g of sodium dodecylbenzenesulfonate, and 2.5 g of sodium dodecylsulfate to a 3-liter round-bottom flask equipped with a glass stirrer, reflux condenser, thermometer, and constant pressure dropping funnel. , 4 grams of polyoxye...

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Abstract

The invention relates to an aqueous polymer coating controlled release fertilizer and a preparation method thereof, in particular to a controlled release fertilizer of a polymer film formed by a composite coating agent comprising aqueous polymer emulsion and a biodegradable natural high molecular material and a preparation method thereof.

Description

technical field [0001] The invention relates to a water-based polymer-coated controlled-release fertilizer and a preparation method thereof, more specifically, to a polymer comprising a composite coating agent comprising a water-based polymer emulsion and a biodegradable natural polymer material. The film controlled-release fertilizer and its preparation method belong to the technical field of fertilizer production. Background technique [0002] At present, polymer-coated controlled-release fertilizers are divided into two categories, one is thermosetting resin-coated controlled-release fertilizers represented by Osmocote produced by Sotts Corporation of the United States, and the other is Meister and Nutricote is a thermoplastic resin-coated controlled-release fertilizer represented by Nutricote. Although the former has good controlled release performance, the coating agent is an expensive polymer material such as polyurethane, the manufacturing process is complicated, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00C08L25/08C08L3/02
CPCC08F212/08C08F220/06C08F220/14C05G5/37C08F220/1802C08F220/1804C08F220/1811
Inventor 万连步张庆玲于兵陈宏坤杨力
Owner KINGENTA ECOLOGICAL ENG GRP
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