Thermoplastic membrane wrapping control-releasing fertilizer with soil improvement action

A technology of coated controlled-release fertilizer and soil improvement, which is applied in the field of thermoplastic resin-coated controlled-release fertilizer products, can solve the problems of high production cost, achieve low cost, reduce cost and improve performance

Active Publication Date: 2012-04-18
KINGENTA ECOLOGICAL ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the research on film-coated controlled-release fertilizers at home and abroad has developed to a relatively high level, the technology has become more and more mature, the performance of nutrient controlled release is good, and the problem of high production cost has been preliminarily solved. Field crops have been initially promoted and phased results have been achieved, but the selection of solvents, the optimization of process parameters and the selection of additives have always been the bottleneck restricting the industrial production of controlled-release fertilizers

Method used

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  • Thermoplastic membrane wrapping control-releasing fertilizer with soil improvement action
  • Thermoplastic membrane wrapping control-releasing fertilizer with soil improvement action
  • Thermoplastic membrane wrapping control-releasing fertilizer with soil improvement action

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: Polyethylene is used as the membrane material to produce coated urea with a total coating rate of 13.8%wt.

[0026] Proceed as follows:

[0027] 1) Add 1500kg of tetrachlorethylene to the dissolution kettle, add 100kg of polyethylene, 33kg of attapulgite and 5kg of chlorinated paraffin into the dissolution kettle, stir and dissolve at a temperature of 110°C to make a coating suspension;

[0028] 2) Air is introduced into the fluidized bed, and 1000kg of granular fertilizer is added to make it in a fluidized state and preheated to 40°C;

[0029] 3) Pressurize the coating suspension to 0.3MPa, spray it on the surface of fertilizer particles through the nozzle in the fluidized bed, the organic solvent will evaporate quickly, and the thermoplastic will remain on the surface of the particles to form a smooth and dense film, and the finished thermoplastic coating will be obtained Controlled release fertilizer. The gas containing tetrachlorethylene can be recyc...

Embodiment 2

[0030] Example 2: Using tetrachlorethylene as a solvent, a mixture of polyethylene and polypropylene is used to produce a coated compound fertilizer with a total coating rate of 6%wt.

[0031] 1) 2500kg tetrachlorethylene is added to the dissolution kettle;

[0032] 2) Add 100kg of polyethylene and polystyrene mixture (70kg of polyethylene and 30kg of polypropylene), 40kg of attapulgite and 10kg of chlorinated paraffin into the dissolution kettle, stir and dissolve at 125°C to make a coating suspension;

[0033] 3) Pass air into the fluidized bed, add 2500kg granular fertilizer to make it in a fluidized state and preheat to 50°C;

[0034] 4) Pressurize the coating suspension to 0.5Mpa, spray it on the surface of fertilizer particles through the nozzle in the fluidized bed, the organic solvent will evaporate quickly, and the thermoplastic will remain on the surface of the particles to form a smooth and dense film, and the finished thermoplastic coating will be obtained Control...

Embodiment 3

[0035] Embodiment 3: use polyethylene to produce a compound fertilizer with a total coating rate of 8.35%wt.

[0036] 1) 2000kg tetrachlorethylene is added to the dissolution kettle;

[0037] 2) Add 100kg of polyvinyl chloride, 50kg of attapulgite and 17kg of paraffin into the dissolution kettle, stir and dissolve at 120°C to make a coating suspension;

[0038]3) Air is introduced into the fluidized bed, and 2000kg of granular fertilizer is added to make it in a fluidized state and preheated to 45°C;

[0039] 4) Pressurize the coating suspension to 0.8Mpa, spray it on the surface of fertilizer particles through the nozzle in the fluidized bed, the organic solvent will evaporate quickly, and the thermoplastic will remain on the surface of the particles to form a smooth and dense film, and the finished thermoplastic coating will be obtained Controlled release fertilizer.

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Abstract

The invention discloses a thermoplastic resin coating controlled release fertilizer with the function of soil improvement, which is prepared by the following processes: 1) tetrachloroethylene is added into a dissolved kettle according to the weight ratio of 1: 15 to 20 between the thermoplastic and tetrachloroethylene; the thermoplastic, attapulgite and polyethylene glycol are added into the dissolved kettle, and are dissolved by stirring so as to prepare coating mixed suspension; 2) gas is pumped into a fluidized bed, and granulated fertilizer is added into the fluidized bed in the fluidizedstate and preheated; 3) the coating mixed suspension in the dissolved kettle is pressurized, and is sprayed onto the surface of fertilizer particles by a nozzle in the fluidized bed, organic solvent volatiles quickly while the thermoplastic is left on the surface of the particles to form a smooth and compact film and the product of the thermoplastic resin coating controlled release fertilizer is obtained. The controlled release duration of the controlled release fertilizer can be long or short and the fertilizer has good function of soil improvement.

Description

technical field [0001] The invention belongs to the field of chemical products, and in particular relates to a thermoplastic resin-coated controlled-release fertilizer product with soil improvement effect. Background technique [0002] my country's fertilizer consumption accounts for about 20-30% of the world's total fertilizer consumption, ranking first in the world. The average seasonal utilization rate of chemical fertilizers in developed countries is 50-60%, and the average seasonal utilization rate of chemical fertilizers in my country is only 30-35%. . The loss and waste of a large number of nutrients not only bring huge economic losses to the society, but also cause serious environmental pollution. At present, with the continuous increase in the amount of chemical fertilizers, the modification of fertilizers is even more important under the multiple goals of pursuing both yield and quality of agricultural products and environmental friendliness. Developing slow-relea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/04C05G3/80
Inventor 万连步解玉洪李广涛
Owner KINGENTA ECOLOGICAL ENG GRP
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