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Alkyd resin emulsion-sulphur composite coating release-controlling fertiliser and method for preparing same

A technology of alkyd resin emulsion and controlled release fertilizer, applied in fertilizer mixture, fertilization device, application and other directions, to achieve the effects of low dependence, low cost and excellent controlled release performance

Active Publication Date: 2012-10-24
KINGENTA ECOLOGICAL ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide an environmentally friendly polymer-sulfur compound coated controlled-release fertilizer to overcome the existing problems of controlled-release fertilizers

Method used

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  • Alkyd resin emulsion-sulphur composite coating release-controlling fertiliser and method for preparing same

Examples

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preparation example Construction

[0025] In a further preferred preparation method, at first fatty acids, polyhydric alcohols and dibasic acids (and / or anhydrides thereof) derived from plants are added to a reactor equipped with a stirrer, a reflux condenser, a thermometer and nitrogen protection, and the temperature is raised to React at 160-260°C for 0.5-6 hours, preferably at 200-240°C for 2-4 hours, and use a water eliminator to remove the water generated in the reaction in time, then cool down to 120-200°C, add other polyacids (and / or their acid anhydride), heat the reaction for at least 0.5 hours, and use a water eliminator to remove the water generated in the reaction in time. Optionally, when the temperature is lowered to 130-160°C, add 2-20% by weight of rosin based on the total weight of the resin, preferably 3-10% by weight, and react at this temperature for 5 minutes to 2 hours, preferably 10 minutes to 0.5 hours . After cooling down, an alkyd resin prepolymer with a certain acid value is obtained...

Embodiment 1

[0053] (1) Preparation of alkyd resin prepolymer

[0054] Add 480 grams of linseed oil, 236 grams of trimethylolpropane and 166 grams of isophthalic acid into a reaction kettle equipped with a stirrer, reflux condenser, thermometer and nitrogen protection, raise the temperature to 235 ° C for 3.5 hours, and then cool down To 175°C, add 73 grams of trimellitic anhydride, react at this temperature for about 3 hours, and use a water remover to remove the water generated in the reaction in time, when the acid value of the system reaches 62KOHmg / g resin, cool down to 150°C, add 49 grams The rosin was reacted for 20 minutes.

[0055] (2) Preparation of alkyd resin emulsion coating agent

[0056] Cool the alkyd resin prepolymer in step (1) to 65° C., and add 20% by weight of ammonia water under stirring to make the pH of the system 7. Then add deionized water, stir and emulsify evenly, then cool to room temperature, then add 2 grams of cobalt naphthenate, 1 gram of zirconium naphth...

Embodiment 2

[0061] With embodiment 1, difference is that the urea in embodiment 1 is replaced with the compound fertilizer of 2~4 millimeters (compound fertilizer comes from Shandong Kingenta Ecological Engineering Co., Ltd., with N-P 2 o 5 -K 2 O% by weight: 16-16-16).

[0062] Calculated by weight of dry matter, the composition of the obtained alkyd resin emulsion-sulfur composite coated controlled-release fertilizer is 85.4% for compound fertilizer, 10.2% for sulfur, 3% for polymer and 1.4% for diatomite. The nutrient release period of this controlled release fertilizer is 266 days.

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Abstract

The invention relates to an alkyd resin emulsion-sulfur compound coated controlled release fertilizer and a preparation method thereof. The coated controlled release fertilizer consists of a fertilizer core and a capsule which is outside the fertilizer core, wherein, the capsule comprises a sulfur capsule, the exterior of the sulfur capsule has a polymer film that contains an alkyd resin emulsioncoated agent and an inorganic layer that is arbitrarily arranged outside the polymer film and contains inorganic powders.

Description

technical field [0001] The invention relates to a coated controlled-release fertilizer, more specifically to an alkyd resin emulsion-sulfur composite coated controlled-release fertilizer and a preparation method thereof, belonging to the technical field of material and fertilizer production. Background technique [0002] Slow / controlled release fertilizers are the development direction of the fertilizer industry, especially the controlled release fertilizers with excellent performance have attracted widespread attention. Sulfur-coated urea (SCU) with sulfur as a coating agent is an earlier industrialized slow-release fertilizer, and its preparation technology has been described in some patents such as US 3,295,950, US 3,342,577; US 3,877,415. Usually, the preparation of sulfur-coated fertilizers is carried out in a fluidized bed. The process is to preheat the fertilizer particles to a certain temperature in the fluidized bed, and then spray the molten liquid sulfur on the fe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00
Inventor 万连步于兵范玲超解玉洪
Owner KINGENTA ECOLOGICAL ENG GRP
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