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Water soluble alkyd resin-sulphur composite coating release-controlling fertiliser and method for preparing same

A technology of alkyd resin and controlled-release fertilizer, applied in the field of materials and fertilizers, can solve the problems of waste of energy and resources, high cost of resin coating materials, harm to the environment and human health, etc., and achieve non-toxic and excellent controlled release during use performance, anti-wear effect of controlled-release performance

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

AI Technical Summary

Problems solved by technology

However, the disadvantage of this type of controlled-release fertilizer is that the cost of resin coating materials is high, and the use of a large amount of organic solvents will inevitably cause waste of energy and resources, and at the same time endanger the environment and human health.

Method used

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  • Water soluble alkyd resin-sulphur composite coating release-controlling fertiliser and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] In a further preferred preparation method, first add plant-derived fatty acids, polyols, and dibasic acids (and / or their anhydrides) into a reactor equipped with a stirrer, a reflux condenser, a thermometer and a nitrogen protection, and the temperature is increased to React at 160~260℃ for 0.5~6 hours, preferably at 200~240℃ for 2~4 hours, and use a water remover to remove the water generated in the reaction in time, then lower the temperature to 120~200℃, add other polybasic acids (and / or Acid anhydride), heat the reaction for at least 0.5 hours, and use a water remover to remove the water generated in the reaction in time. Optionally, add 2-20% by weight, preferably 3-10% by weight, of the total weight of the resin when the temperature is lowered to 130-160°C, and react at this temperature for 5 minutes to 2 hours, preferably 10 minutes to 0.5 hours . After cooling, an alkyd resin prepolymer with a certain acid value is obtained. (2) Preparation of water-soluble alk...

Embodiment 1

[0051] (1) Preparation of water-soluble alkyd resin coating agent

[0052] Put 480 grams of linseed oil, 236 grams of trimethylolpropane and 166 grams of isophthalic acid into a reactor equipped with a stirrer, a reflux condenser, a thermometer and a nitrogen protection. The temperature is raised to 235°C for 3.5 hours, and then the temperature is lowered. When the temperature reaches 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 temperature of the system to 150°C and add 49 grams of rosin reacted for 20 minutes.

[0053] The temperature of the above reaction system is lowered. When the temperature is lowered to 70°C, 70 grams of a mixed solution consisting of ethylene glycol monobutyl ether and isopropanol (the weight ratio of the two is 1:1.5) is added and mixed uniformly, and the temperat...

Embodiment 2

[0058] Same as Example 1, the difference is that the large granular urea in Example 1 is replaced with a compound fertilizer of 2 to 4 mm (the compound fertilizer comes from Shandong Jinzhengda Ecological Engineering Co., Ltd., with N-P 2 O 5 -K 2 O weight %: 16-16-16).

[0059] Calculated by dry matter weight, the composition of the obtained composite coated controlled-release fertilizer is compound fertilizer accounting for 85.9%, sulfur accounting for 10.3%, polymer accounting for 2.6%, and diatomaceous earth accounting for 1.2%. The nutrient release period of the controlled release fertilizer is 207 days.

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Abstract

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00
Inventor 陈宏坤万连步范玲超徐恒军曹淮圣
Owner KINGENTA ECOLOGICAL ENG GRP
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