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Water-soluble polymers coating agent, coating release-controlling fertiliser and method for preparing same

A water-soluble polymer, controlled-release fertilizer technology, applied in the field of materials and fertilizers, can solve problems such as soil pollution, human health and environmental hazards, and refractory polymer film residues, meet the release requirements, low cost, and environmental friendliness Effect

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

However, 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; The residual film is not easy to degrade in the soil, and long-term use will cause certain pollution to the soil
These technologies partially overcome 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 solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] 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

[0048] (1) Preparation of water-soluble polymer coating agent

[0049] 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 62mgKOH / g resin, reduce the system temperature to 150°C, add 49 grams of rosin were reacted for 20 minutes.

[0050] Lower the temperature of the above reaction system, when the temperature drops to 70°C, add 70 grams of a mixed solution composed of ethylene glycol monobutyl ether and isopropanol (the weight ratio of the two is 1:1.5) and mix evenly, drop to 50°C Hereinafter, first use 15% by weight of ammonia water to adjust the syst...

Embodiment 2

[0055] The water-soluble polymer coating agent in Example 1 was used.

[0056] 5 kg of large-grained urea (from Shandong Mingshui Chemical Co., Ltd., 46.4 in N wt%) with a particle size of 3-4 mm was charged into the fluidized fluidized bed and heated to about 90°C. 4 kilograms of above-mentioned coating agents that have been preheated to about 75 ℃ are sprayed onto the fertilizer surface from a double-flow nozzle at a rate of 80 grams per minute to obtain polymer-coated controlled-release urea. Calculated by weight of dry matter, the composition of the coated controlled-release fertilizer is 83.3% of urea and 16.7% of polymer. The nutrient release period of the controlled release fertilizer is 105 days.

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Abstract

The invention relates to a water-soluble polymer coated agent, a coated controlled release fertilizer that contains a coated agent and a preparation method thereof. The water-soluble polymer coated agent of the invention is characterized in that the coated agent contains alkyd resin prepolymer in a way of neutralization. The coated controlled release fertilizer of the invention consists of a fertilizer core and a capsule which is outside the fertilizer core; wherein, the capsule contains a polymer film that contains the water-soluble polymer coated agent of the invention, 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 water-soluble polymer 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] The use of slow / controlled release fertilizers can significantly increase the utilization rate of chemical fertilizers and labor productivity. It is an important way to reduce the production cost of agricultural products, an important means to protect the ecological environment, and an important guarantee for the sustainable development of agriculture. [0003] Among the reported slow / controlled release fertilizers, coated controlled release fertilizers are the mainstream and main development direction. Sulfur-coated urea is a typical representative of controlled-release fertilizers with inorganic substances as the coating agent, and its preparation technology has been disclosed in a number of pate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 万连步范玲超郑启亮陈宏坤高义武
Owner KINGENTA ECOLOGICAL ENG GRP
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