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

A technology of alkyd resin emulsion and controlled-release fertilizer, which is applied in fertilizer mixture, fertilization equipment, application, etc. It can solve the problems of incomplete elimination of organic solvent hazards, reduced controlled-release performance of fertilizer products, and difficulty in degrading polymer residual films. Achieve excellent controlled release properties, excellent biodegradable properties, impact and anti-wear controlled release properties

Active Publication Date: 2008-10-22
KINGENTA ECOLOGICAL ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, there have also been reports of using waste plastics as main raw materials to prepare water-based polymer-coated controlled-release fertilizers, but this technology has not completely eliminated the harm of organic solvents; although there are also reports of using water-soluble resins as fertilizer coating agents, but often It is necessary to add some organic solubilizers to improve the water solubility of the resin (for example, see CN 1473806A); in addition, the solid content of the coating agent is also low, and the energy consumption of the coating process is relatively large due to the relatively large heat of vaporization of water
[0006] At present, the water-based polymer coating agent mainly has the following three problems: the dissolution of water to the fertilizer during the production process makes the formed polymer film not dense enough, which leads to the reduction of the controlled release performance of the fertilizer product; there are some organic solvents in the coating agent; Polymer residual film is difficult to degrade in soil

Method used

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

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preparation example Construction

[0027] 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 62KOH mg / g resin, cool down to 150 ° C, add 49 Gram 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] (1) Preparation of alkyd resin prepolymer

[0062] Add 190 grams of linseed oil, 210 grams of dehydrated castor oil, 223 grams of trimethylolpropane and 148 grams of phthalic anhydride into a reactor equipped with a stirrer, reflux condenser, thermometer and nitrogen protection, and raise the temperature to 225 °C for 2.5 hours. Then cool down to 170°C, add 64 grams of trimellitic acid, react at this temperature for about 3.5 hours, and use a water remover to remove the water generated in the reaction in time. When the acid value of the system reaches 55mgKOH / g resin, cool down to 160 ℃, add 60 grams of rosin and react for 15 minutes.

[0063] (2) Preparation of alkyd resin emulsion coating agent

[0064] Cool the alkyd resin prepolymer in step (1) to 75° C., and add 20% by weight of ammonia water under stirring to make the pH of the system 7.5. Then add deionized water, stir and emulsify evenly, then cool to room temperature, then add 1.8 grams of cobalt naphthenate...

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Abstract

The invention relates to an alkyd resin emulsion-wax 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 wax capsule, the exterior of the wax capsule has a polymer film that contains an alkyd resin emulsion coated agent and an inorganic layer that is arbitrarily arranged on 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-wax composite coated controlled-release fertilizer and a preparation method thereof, belonging to the technical field of material and fertilizer production. Background technique [0002] At present, the loss of chemical fertilizers during use is serious, which not only causes a huge waste of resources, but also brings serious pollution to water sources, soil and the atmosphere. How to reduce the amount of fertilization and improve the utilization rate of fertilizer is one of the key problems to be solved urgently in the sustainable development of agriculture. The development of efficient and environmentally friendly slow-release fertilizers is an effective way to solve this problem. [0003] Coated controlled-release fertilizers are the mainstream and development direction of controlled-release fertilizers. At present, coated controlled-relea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 解玉洪万连步范玲超李丽李广涛徐淑班
Owner KINGENTA ECOLOGICAL ENG GRP
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