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
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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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