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Environment friendly sulfur coating type sustained-release chemical fertilizer

A technology of coating and chemical fertilizers, applied in fertilization devices, fertilizer mixtures, agriculture, etc., can solve the problems of unstable release period, poor impact resistance, high cost, etc., and achieve long release period, low cost and long release period stable effect

Inactive Publication Date: 2009-01-14
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the impact resistance of this environmentally friendly sulfur-coated slow-release chemical fertilizer is not very good, and the release period is not very stable, or to achieve good release period stability, epoxy resin, polyurethane, and unsaturated polyester are used. The amount of polymers such as polyolefins or degradable polymers is still relatively large, and the cost is relatively high

Method used

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  • Environment friendly sulfur coating type sustained-release chemical fertilizer
  • Environment friendly sulfur coating type sustained-release chemical fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add spherical urea with a particle size of 2.9 to 3.1mm into the fluidized bed coating equipment, and keep the spherical urea in a boiling state, and keep the temperature of the spherical urea in the fluidized bed at 90°C. Slowly spray molten sulfur at about 150°C on the surface of urea until the quality of the sulfur film reaches 11% of the total mass of the final product, environmentally friendly sulfur-coated slow-release urea (thickness is about 40 μm). Then, spray the urea-formaldehyde resin prepolymer aqueous solution (the urea-formaldehyde resin prepolymer is that urea: formaldehyde molar ratio is 1: 1.5 is prepared by the reaction of urea and formaldehyde containing poplar wood powder (150 μ m) on the surface of the sulfur film layer, Poplar wood powder: urea-formaldehyde resin prepolymer mass ratio is 3: 2), spray until urea-formaldehyde resin / poplar wood powder composite film quality reaches 5% of the final finished product environmental protection sulfur coati...

Embodiment 2

[0040] Add spherical urea with a particle size of 2.9 to 3.1mm into the fluidized bed coating equipment, and keep the spherical urea in a boiling state, and keep the temperature of the spherical urea in the fluidized bed at 90°C. Slowly spray molten sulfur at about 150°C on the surface of urea until the quality of the sulfur film reaches 11% of the total mass of the final product, environmentally friendly sulfur-coated slow-release urea. Then, spray the melamine-formaldehyde resin prepolymer aqueous solution (melamine-formaldehyde resin prepolymer is melamine: formaldehyde mol ratio is 1: 3 melamine and formaldehyde that contain bagasse powder (average particle diameter 150 μm)) Prepared by reaction, bagasse powder: the mass ratio of melamine-formaldehyde resin prepolymer is 7: 3), spray until the quality of melamine-formaldehyde resin / bagasse powder composite film layer reaches the final product environmental protection sulfur coated slow-release urea 6% of the total mass (re...

Embodiment 3

[0042] Add spherical urea with a particle size of 2.9 to 3.1mm into the fluidized bed coating equipment, and keep the spherical urea in a boiling state, and keep the temperature of the spherical urea in the fluidized bed at 90°C. Slowly spray molten sulfur at about 150°C on the surface of urea until the quality of the sulfur film reaches 11% of the total mass of the final product, environmentally friendly sulfur-coated slow-release urea. Then, spray melamine-formaldehyde resin prepolymer aqueous solution (melamine-formaldehyde resin prepolymer is that melamine: formaldehyde mol ratio is 1: 3 is prepared by the reaction of melamine and formaldehyde) at the surface of sulfur film layer again, spray until melamine-formaldehyde resin The quality of the film layer reaches 1% of the total mass of the final product, environmentally friendly sulfur-coated slow-release urea. Subsequently, spray the melamine-formaldehyde resin prepolymer aqueous solution (melamine-formaldehyde resin pre...

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Abstract

The invention discloses an environment-friendly sulfur-coated slow release fertilizer. The environment-friendly sulfur-coated slow release fertilizer is composed of a fertilizer core 1 and an outer envelope of the fertilizer core, the envelope comprises (a) a sulfur film layer 2, (b) a degradable polymer-organic polymer powder compound film layer 3, with or without (c) a degradable polymer film layer 4; wherein, the sulfur film layer is an inner layer or an intermediate layer of the whole envelope, the outer layer of the envelope is the degradable polymer-organic polymer powder compound film layer, and the external surface of the envelope is a rugged surface with raised organic polymer powder. The degradable polymer can be one or more of amido resin, polyvinyl alcohol and acetal resin of copolymer, unsaturated oil resin, biodegradation type polyester and natural polymer as well as derivates. The organic polymer powder is one or more of plant powder, animal powder and synthetic polymer powder. The sulfur-coated slow release fertilizer has advantages of stable release period and non pollution or low pollution to the environment of the enveloped body.

Description

1. Technical field [0001] The invention relates to a coated slow-release chemical fertilizer, in particular to an environment-friendly sulfur coated slow-release chemical fertilizer, which belongs to the field of chemical fertilizer industry. 2. Background technology [0002] Slow-release fertilizer is the development direction of the world's fertilizer industry. Environmentally friendly sulfur-coated slow-release fertilizers are an important type of slow-release fertilizers, and are currently the most widely used coated slow-release fertilizers. [0003] Because sulfur is brittle and has poor impact resistance and poor film-forming properties, it is easy to have holes. The slow-release fertilizer made by simply using sulfur coating has a short release period and poor stability. Therefore, environmentally friendly sulfur-coated slow-release fertilizers are usually used in sulfur The film layer is covered with an organic polymer film layer. The organic polymers used include ...

Claims

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Application Information

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IPC IPC(8): C05G3/00
Inventor 应宗荣应榜元
Owner NANJING UNIV OF SCI & TECH
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