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Unsaturated polyester resin coated controlled-release fertilizer with sulfur as base coating and preparation method thereof

A polyester resin and controlled-release fertilizer technology, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of high price of coated fertilizers, low sulfur content, and wide application, and achieve good nutrient control Release performance, fast curing and low production cost

Active Publication Date: 2014-05-28
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are mainly two methods: one is to mix the polymer and sulfur to coat fertilizer particles to improve the toughness, impact resistance, wear resistance and other properties of sulfur, such as patent CN101100405B and USA 6,617,412, but the quality of sulfur in these patented technologies The score is not high, so its release period is not long, and the price of the whole coated fertilizer is still high due to the high content of the polymer; another technology is mainly to apply a layer of sealant on the outside of the sulfur film, Such as patent CN1072196C, CN1072195C and USA4,342,577
Although these methods can overcome the above shortcomings to a certain extent, there are still problems such as poor toughness, wear resistance, and high price, which affect its wide application in agriculture.

Method used

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  • Unsaturated polyester resin coated controlled-release fertilizer with sulfur as base coating and preparation method thereof
  • Unsaturated polyester resin coated controlled-release fertilizer with sulfur as base coating and preparation method thereof
  • Unsaturated polyester resin coated controlled-release fertilizer with sulfur as base coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Put 85kg of large-grain urea with a diameter of 2-5mm into the drum, heat it to 60-90°C, and spray the liquid sulfur heated to the molten state (150-160°C) with compressed air (two-fluid nozzle) On the surface of the urea granule fertilizer, the air atomizing nozzle sprays 15kg of liquid sulfur onto the granule, and the sulfur in the obtained sulfur-coated urea accounts for 15% of the total weight of the fertilizer. Then unsaturated polyester 191#0.288kg, accelerator cobalt octoate 0.006kg and initiator methyl ethyl ketone peroxide 0.01kg are mixed and stirred evenly, then gradually added to the urea granules coated with sulfur, along with the continuous rotation of the drum, that is The unsaturated polyester resin coating solution can be evenly coated on the surface of the particles, and it can be cured into a film in about 5 minutes. The obtained product is an unsaturated polyester resin-coated controlled-release fertilizer with sulfur as the base coat. This fertiliz...

Embodiment 2

[0027] Put 82kg of large-grain urea with a diameter of 2-5mm into the drum, heat it to 60-90°C, and then spray the liquid sulfur heated to the molten state (150-160°C) with compressed air (two-fluid nozzle) On the surface of urea granule fertilizer, this air atomizing nozzle can spray at a rate of 50-80g per minute, and directly spray all 18kg of liquid sulfur on the granule, and the sulfur in the obtained sulfur-coated urea accounts for 18% of the total weight of the fertilizer . Then unsaturated polyester 3301#0.336kg, accelerator cobalt naphthenate 0.007kg and initiator methyl ethyl ketone peroxide 0.009kg are mixed and stirred evenly, and then gradually added to the sulfur-coated urea particles, with the continuous rotation of the drum , that is, the unsaturated polyester resin coating solution can be evenly coated on the particle surface, and it can be cured into a film in about 5 minutes. This process is repeated twice, and the obtained product is an unsaturated polyest...

Embodiment 3

[0031]Put 80kg of large-grain urea with a diameter of 2-5mm into the drum, heat it to 60-90°C, and spray the liquid sulfur heated to the molten state (150-160°C) with compressed air (two-fluid nozzle) On the surface of urea granule fertilizer, the air atomizing nozzle can spray at a rate of 50-80g per minute, spray 20kg of liquid sulfur onto the granule, and the sulfur in the obtained sulfur-coated urea accounts for 20% of the total weight of the fertilizer. Then unsaturated polyester 3301#0.32kg, accelerator cobalt octoate 0.006kg and initiator cyclohexanone peroxide 0.008kg are mixed and stirred evenly, and then gradually added to the sulfur-coated urea particles, with the continuous rotation of the drum , that is, the unsaturated polyester resin coating solution can be evenly coated on the surface of the particles, and it can be cured into a film in about 5 minutes. This process is repeated three times, and the obtained product is an unsaturated polyester resin-coated contr...

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Abstract

The invention relates to an unsaturated polyester resin coated controlled-release fertilizer with sulfur as a base coating and a preparation method thereof. The preparation method comprises the steps of: firstly, preheating a granular fertilizer in a rotating drum to be at a certain temperature; then, spraying molten liquid sulfur on the granular fertilizer uniformly to form a layer of smooth and compact sulfur film to obtain a sulfur coated fertilizer; and finally, spraying a prepared unsaturated polyester resin coated solution to the surface of the moving sulfur coated granular fertilizer and curing quickly to form a film, so as to obtain the sulfur coated fertilizer externally coated with unsaturated polyester resin. The controlled-release fertilizer has the capacity of relatively well preventing sulfur film from antioxidation, resisting the shock and the like, as well as has the property of enabling nutrients in the film to be released in a controllable manner according to a preset mode; and the release duration of the nutrients is controlled within 1-12 months. In addition, the unsaturated polyester resin coated controlled-release fertilizer is low in cost, simple in process, and perfectly suitable for the large-scale production and the wide generalization on field crops.

Description

(1) Technical field [0001] The invention relates to an unsaturated polyester resin-coated controlled-release fertilizer with sulfur as an undercoat layer and a preparation method thereof, belonging to the field of controlled-release fertilizer production. (2) Background technology [0002] my country is a large agricultural country, and a large amount of chemical fertilizers are used every year, but the current utilization rate of chemical fertilizers is too low, resulting in economic and energy waste and various environmental pollution problems. Therefore, how to greatly increase the utilization rate of chemical fertilizers, improve the quality of agricultural products, and achieve environmentally friendly development is an important problem that needs to be solved urgently in the development of sustainable and efficient agriculture. The invention and production of coated controlled-release fertilizers and their application in agriculture have opened up new ideas and more e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00
Inventor 张民陆盘芳
Owner SHANDONG AGRICULTURAL UNIVERSITY
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