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Degradable polymer integument type slow release fertilizer

A technology for degrading polymers and slow-release fertilizers. It is applied in the field of coated slow-release fertilizers and degradable polymer-coated slow-release fertilizers. It can solve the problems of low toughness, short release period, and only tens of days. Achieve the effects of low cost, reduced consumption, and reduced cost

Inactive Publication Date: 2007-03-07
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because tung oil or tung oil-modified phenolic resin, which is also a degradable polymer, has low barrier properties to water and fertilizer, its soaking and sealing of urea-formaldehyde resin-wrapped sheet-shaped urea does not make the coating resistant to water and fertilizer. Therefore, although the volume of its flake urea is dozens of times the volume of ordinary industrial urea (for example, its volume is about 22 times the volume of 3.0mm spherical industrial urea, the specific surface area is 3.0mm spherical industrial About 1 / 2 of that of urea), the total thickness of its envelope is as high as about 120-170 μm, but the calculated release period is only a few tens of days
Moreover, the tung oil or tung oil modified phenolic resin film layer is on the outermost surface of the urea coating, and the dip-coated thin layer is easily damaged during the storage, transportation and fertilization process of the coated slow-release urea, especially in the process of mechanical fertilization. At the same time, their toughness is not high (the elongation at break is low), and the layer is thin and the bearing capacity is small. After the coated slow-release urea fertilizes into the field, the dip-coated thin layer will be broken due to the water absorption of the fertilizer and the water absorption of the urea-formaldehyde resin. Streaks, resulting in a shorter release period in actual use

Method used

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  • Degradable polymer integument type slow release fertilizer
  • Degradable polymer integument type slow release fertilizer
  • Degradable polymer integument type slow release fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 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 70°C. Spray the cyclohexane solution of styrene-butadiene-styrene block copolymer on the surface of granular urea until the quality of the formed styrene-butadiene-styrene block copolymer film reaches the level of degradability of the final product 3% of the total mass of polymer-coated slow-release urea is fully dried to remove cyclohexane in the film layer. Then, spray urea-formaldehyde resin prepolymer aqueous solution on the surface of styrene-butadiene-styrene block copolymer film layer (urea-formaldehyde resin prepolymer is that urea: formaldehyde molar ratio is 1: 1.3 urea and formaldehyde reaction preparation) until the quality of the formed urea-formaldehyde resin film layer reaches 17% of the total mass of the degradable polymer-coated slo...

Embodiment 2

[0060] 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 65°C. The paraffin wax (melting point is 75 DEG C) melt is sprayed on the surface of the urea until the quality of the formed paraffin film layer reaches 3% of the total mass of the final degradable polymer-coated slow-release urea. Then, spray the benzene solution of butadiene rubber raw rubber on the surface of the paraffin film layer until the quality of the butadiene rubber film layer formed reaches 1% of the total mass of the final product degradable polymer coated slow-release urea, and vacuum drying is sufficient Remove the benzene in the film layer. Finally, spray melamine-formaldehyde resin prepolymer aqueous solution (melamine-formaldehyde resin prepolymer is that melamine: formaldehyde molar ratio is 1: 3 melamine and formaldehyde reactio...

Embodiment 3

[0062] 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 80°C. Tung oil (drying agent containing 0.4% of tung oil mass) is sprayed on the surface of urea until the quality of the formed layer of tung oil resin film reaches 18% of the total mass of the final finished degradable polymer-coated slow-release urea. Then, spray polyethylene wax (molecular weight is 1800) benzene solution on the surface of the tung oil resin film layer, until the quality of the polyethylene wax film layer formed reaches 4% of the total mass of the final product degradable polymer coated slow-release urea. Fully dry to remove the benzene in the film layer, and fully solidify the tung oil resin in the film layer to obtain the degradable polymer-coated slow-release urea. The release period of the prepared degradable polymer-coated ...

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Abstract

The invention discloses a decomposable polymer film-typed slow release fertilizer, which consists of fertilizer core 1 and film, wherein the film is composed of (a) high-impedance porous organic film 2, (b) compound film 3 with sulphur and or decomposable polymer layer 4, which is whole film lining or middle layer; the decomposable polymer can be one or more of amino resin, polyvinyl alcohol and acetal resin of polymer, unsaturated oil resin and natural polymer and derivant.

Description

1. Technical field [0001] The invention relates to a film-coated slow-release fertilizer, in particular to a degradable polymer-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 in the world. In particular, the development of coated slow-release fertilizers coated with degradable materials meets the requirements of environmental protection and sustainable social development, and will become the mainstream of slow-release fertilizers in the future. [0003] However, the degradable material is a highly polar material, and its permeation rate to water and fertilizer is very high, so the release period of the degradable coated slow-release fertilizer prepared by using the degradable material is very short. Coated slow-release fertilizers coated with urea-formaldehyde resin generally only last for a few days. Therefore...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/08C05G5/00C05G3/90
Inventor 应宗荣
Owner NANJING UNIV OF SCI & TECH
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