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Polymer emulsion coating agent, coating release-controlling fertiliser and method for preparing same polymer emulsion

A polymer emulsion and controlled-release fertilizer technology, applied in the field of materials and fertilizers, can solve the problems that have not been well resolved, human health and environmental hazards, and high cost, and achieve controllable nutrient release time, low dependence, and low cost. cheap effect

Active Publication Date: 2008-10-22
河南豫邮金大地科技服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, this type of controlled-release fertilizer has the following disadvantages: the price of polymer coating materials and high production costs; the use of a large amount of organic solvents not only seriously wastes energy and resources, but also causes harm to human health and the environment. Reduce the above-mentioned consumption and harm, but in addition to high one-time equipment investment and complicated process, a small amount of organic solvents remaining in the product will still gradually volatilize during storage and use and pollute the environment
The above-mentioned technology partially overcomes the shortcomings of solvent-based polymer-coated controlled-release fertilizers, but because the raw materials for synthesizing this type of coating agent depend on petroleum, the cost is high, and the polymer in the coating agent is thermoplastic synthetic resin in addition. The released polymer film is difficult to degrade in the soil, and the problem of soil pollution has not been well resolved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] 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

[0055] (1) Preparation of alkyd resin prepolymer

[0056] 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.

[0057] (2) Preparation of polymer emulsion coating agent

[0058] 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 naphthenat...

Embodiment 2

[0063] Same as Example 1, the difference is that diatomaceous earth is not sprayed.

[0064] Calculated by weight of dry matter, the obtained coated controlled-release fertilizer consists of 85.1% of urea and 14.9% of polymer. The nutrient release period of this controlled release fertilizer is 95 days.

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Abstract

The invention relates to a polymer emulsion coated agent, a coated controlled release fertilizer that contains a coated agent and a preparation method thereof. The polymer emulsion coated agent of the invention is characterized in that the coated agent contains alkyd resin prepolymer in a way of neutralization. The invention also relates to the coated controlled release fertilizer, and the fertilizer consists of a fertilizer core and a capsule which is outside the fertilizer core; wherein, the capsule contains a polymer film that contains the polymer emulsion coated 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 polymer emulsion coating agent, a coated controlled-release fertilizer containing the coating agent and a preparation method thereof, belonging to the technical field of materials and fertilizers. Background technique [0002] Controlled-release fertilizers are the main development direction in the field of fertilizers because their nutrient release rules can match the nutritional needs of plants. Polymer-coated controlled-release fertilizers have attracted worldwide attention due to their excellent nutrient-controlled release properties, and have become the main type of controlled-release fertilizers. [0003] Related preparation technologies of polymer-coated controlled-release fertilizers have been described in patents, for example, see US3,223,518, US 3,475,154, US 4,019,890, US 6,391,454, ZL 00122658.4, CN1569773, CN 1603288, etc. Some technologies have been industrialized, among which the thermosetting resin-coated con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 万连步范玲超张庆玲陈德清高义武陈宏坤
Owner 河南豫邮金大地科技服务有限公司
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