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Dressed slow-releasing fertilizer and its production

A slow-release fertilizer and coating technology, which is applied in the field of coated slow-release fertilizer and its preparation, can solve the problems of insufficient slow-release performance, short dissolution time in the whole process, low dissolution rate, etc., so as to reduce the amount of coating and reduce fertilizer Dissolution rate, effect of reducing film thickness

Inactive Publication Date: 2006-11-01
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention aims to improve the barrier ability of the polar coating, prepare a polar coated slow-release fertilizer with a low fertilizer dissolution rate, and solve the problem of polar coated slow-release fertilizers, especially polar polymer coated slow-release fertilizers. Insufficient slow-release performance of fertilizers and short dissolution time in the whole process, and at the same time reduce the cost of coated slow-release fertilizers, which is conducive to popularization and application

Method used

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  • Dressed slow-releasing fertilizer and its production

Examples

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preparation example Construction

[0042] In the preparation method of the film-coated slow-release fertilizer of the present invention, the adhesive composition used when coating the film can be an adhesive, or an adhesive precursor, or an adhesive or an adhesive precursor Compounds with barrier inorganic fillers, which can also be mixed with adjustment aids, solvents or dispersion media, etc. When coating to form a film, the adhesive composition should be made into a liquid form (such as by heating) so as to be coated and formed into a film. The impermeable inorganic filler can be coated once on the surface of the granular fertilizer after coating the liquid binder composition for several times. In order to implement multiple coatings smoothly, the adhesive composition of the inner layer can be properly cured during the coating process or between two coatings, but it should be ensured that there is a sticky coating on the surface of the granular fertilizer when the barrier inorganic filler is adhered. layer ...

Embodiment 1

[0059] Using unsaturated polyester resin as binder, nano CaCO 3 (The average particle diameter is 80nm, the same below) is a barrier inorganic filler to prepare coated slow-release urea. Nano-CaCO 3 Surface treatment with surfactants to prepare nano-active CaCO 3 use.

[0060] Mix the unsaturated polyester resin prepolymer (brand A400-972, produced by Nanjing Jinling DSM Co., Ltd., the same below), the initiator dibenzoyl peroxide and the catalyst dimethylaniline, and make a binder combination and defoaming for later use. In the adhesive composition, the mass dosages of dibenzoyl peroxide and dimethylaniline are respectively 1.5% and 0.8% of the unsaturated polyester resin prepolymer.

[0061] Add the granular urea into the fluidized bed coating equipment, and keep the granular urea in a boiling state, so that the temperature of the granular urea in the fluidized bed is kept at 70°C. The adhesive composition is continuously sprayed on the surface of urea, and at the same ...

Embodiment 2

[0063] Using unsaturated polyester resin as binder, nano CaCO 3 As a barrier inorganic filler, a coated slow-release urea was prepared. Nano-CaCO 3 Surface treatment with surfactants to prepare nano-active CaCO 3 use.

[0064] Unsaturated polyester resin prepolymer, initiator dibenzoyl peroxide, catalyst dimethylaniline and nano-active CaCO 3 Mix evenly, prepare the adhesive composition and defoam for use. In the adhesive composition, the mass consumption of dibenzoyl peroxide and dimethylaniline is respectively 1.5% and 0.8% of the unsaturated polyester resin prepolymer, unsaturated polyester resin prepolymer: nanometer CaCO 3 The mass ratio is 95:5.

[0065] Add the granular urea into the drum coating equipment with a temperature control of 70°C, and rotate the drum (rotating speed: 50r / min) to make the granular urea flow in the drum. After evacuating until the residual pressure in the drum is about 10kPa, feed styrene gas into the drum coating machine until the pressu...

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Abstract

A coated slow-releasing fertilizer and its production are disclosed. The volume fraction of nanometer resistant inorganic filler with average particle size<1 mum is 0.5-80%, volume fraction of polar bonding material is 99.5-20%. It has long total-distance stripping time and excellent slow-releasing performance.

Description

A technical field [0001] The invention relates to a film-coated slow-release fertilizer and a preparation method thereof, belonging to the field of fertilizers and their manufacture. Two background technology [0002] At present, agricultural chemical fertilizers are basically instant fertilizers, which dissolve quickly in water, which may cause the problem of "burning out" the root system of plants in the early stage of fertilization. The effective utilization rate of instant fertilizer is low, and it must be applied in excess to ensure the demand of crops. The excessive application of fertilizer is not absorbed by crops, but it causes serious pollution to the environment. For example, eutrophication of surface water and groundwater occurs in some areas. In particular, the excessive application of fertilizers not only increases the cost of agricultural products, but also causes the residual chemical fertilizer content in crops such as grains, wheat, vegetables, etc. to seri...

Claims

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Application Information

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IPC IPC(8): C05G5/00
Inventor 应宗荣应榜元王滨胡媛
Owner NANJING UNIV OF SCI & TECH
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