Improved sulfur envelope type slow release fertilizer

A slow-release fertilizer and coating technology, which is applied in the field of coated slow-release fertilizers and improved sulfur composite coated slow-release fertilizers, can solve the problem that the release period of sulfur composite coated slow-release fertilizers is not very long, and achieves low cost effect

Inactive Publication Date: 2007-05-16
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both thermosetting polymers and thermoplastic polyurethanes are highly polar polymers, and their film layers have high permeability to water and fertilizers, so the release period of the sulfur compound coated slow-release fertilizers prepared by them is still not very long.

Method used

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  • Improved sulfur envelope type slow release fertilizer
  • Improved sulfur envelope type slow release fertilizer
  • Improved sulfur envelope type slow release fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add granular industrial urea with a particle size of 2.0 to 4.0mm into the fluidized bed coating equipment, and keep the granular urea in a boiling state, and keep the temperature of the granular urea in the fluidized bed at 55°C. Slowly spray molten sulfur at about 150°C on the surface of granular urea until the quality of the formed sulfur film reaches 15% of the total mass of the final product improved sulfur composite coated slow-release urea. Then, spray paraffin melt (paraffin wax melting point is 60 ℃) on the surface of the sulfur film layer, and spray until the quality of the formed paraffin film layer reaches 2% of the total mass of the final product improved sulfur composite coating type slow-release urea. Finally, spray the mixture of 4,4-diphenylmethane diisocyanate, triethanolamine and diethylene glycol on the surface of the paraffin film layer (the molar ratio of triethanolamine: diethylene glycol is 0.2: 1, the molar ratio of -NCO: -OH Ratio is 1.1: 1) me...

Embodiment 2

[0039] Add granular industrial urea with a particle size of 2.0 to 4.0mm into the drum coating equipment with a temperature control of 95°C, and rotate the drum (rotating speed 40r / min) to make the granular urea flow in the drum. Slowly spray molten sulfur at about 150°C on the surface of granular urea until the quality of the formed sulfur film reaches 13% of the total mass of the final product improved sulfur composite coated slow-release urea. Then, the mixed emulsion (styrene-butadiene rubber in the mixed emulsion: the mass ratio of polystyrene is 1: 3) that is formed by styrene-butadiene rubber emulsion and polystyrene emulsion is sprayed on the surface of the sulfur film layer, spray until the styrene-butadiene rubber that forms- The quality of the polystyrene mixture film layer reaches 1.5% of the total mass of the final product improved sulfur composite coating type slow-release urea, and the film layer is fully dried to remove water contained in the film layer. Finall...

Embodiment 3

[0041] Add granular industrial urea with a particle size of 2.0 to 4.0mm into the drum coating equipment with a temperature control of 65°C, and rotate the drum (rotating speed 40r / min) to make the granular urea flow in the drum. Slowly spray molten sulfur at about 150°C on the surface of granular urea until the quality of the formed sulfur film reaches 11% of the total mass of the final product improved sulfur composite coated slow-release urea. Then, spray the solvent gasoline solution of butadiene rubber on the surface of the sulfur film layer, spray until the quality of the butadiene rubber film layer formed reaches 1.5% of the total mass of the final product improved sulfur composite coating type slow-release urea, fully dry and remove the film Layer solvent gasoline. Finally, spray S-739S type unsaturated polyester prepreg containing 10% plasticizer butyl phthalate benzyl ester, 1.5% benzoyl peroxide and a small amount of catalyst on the surface of butadiene rubber raw r...

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Abstract

The invention discloses a modified sulfur composite integument-typed slow release fertilizer, which is composed of fertilizer core 1 and integument on the outer surface of fertilizer core, wherein the integument contains (a) sulfur film layer2, (b) high-permeability resistance organic film layer 3 and (c) high-polarity polymer film 4, wherein the sulfur film layer is the most inner film layer or middle film layer of entire integument; the outer film layer of integument is high-polarity polymer film layer; the high-permeability organic film layer is low-molecular organics and or non-polarity monomer with carbon and hydrogen atom weigh fraction not less than 50% in the total polymer film layer; the high-polarity polymer is heat solidity polymer and or heat plastic polyurethane.

Description

1. Technical field [0001] The invention relates to a film-coated slow-release fertilizer, in particular to an improved sulfur composite film-coated slow-release fertilizer, which belongs to the field of fertilizer industry. 2. Background technology [0002] At present, slow-release fertilizers are the development direction of agricultural fertilizers. Among them, coated slow-release fertilizers are an important type of slow-release fertilizers, and sulfur-coated slow-release fertilizers have become one of the development priorities of coated slow-release fertilizers due to their low cost. [0003] However, the coating performance of sulfur is not very good. There are often some pinholes or cracks in the formed sulfur film layer. At the same time, sulfur is brittle, and the sulfur film layer is also easy to crack and produce cracks during storage and transportation. Therefore, only The slow-release performance of sulfur-coated slow-release fertilizer prepared by coating sulf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G5/00C08L25/06C08L7/00C08L67/06C08L63/00C08L75/04
Inventor 应宗荣应榜元陈辉
Owner NANJING UNIV OF SCI & TECH
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