Controlled release combination of coating film for fertilizer and preparation method thereof

Abstract

The present invention discloses a fertilizer controllable released covering film composition and its preparation method. Said covering film composition contains waste and old-polystyrene, additive and organic solvent. Its preparation method includes the following steps: pulverizing waste and old polystyrene, preparing organic solvent, uniformly mixing polystyrene plastic granules and additive, then mixing then with organic solvent and stirring them at 90-130 deg.C, feeding fertilizer granules into fluid-bed, heating to 40 deg.C and making them be flowed out from fluid-bed, at the same time using nozzle to spray covering film solution on the surface of fertilizer granule so as to obtain the fertilizer with covering film.

Description

technical field

[0001] The invention discloses a composition for gradually spraying coating liquid on the surface of fertilizer granules by fluidized bed equipment to form a film with controlled release function, and is especially suitable for the fertilizer controlled release coating film composition and its preparation method. Background technique

[0002] At present, there are mainly two types of coated controlled-release fertilizers at home and abroad, namely organic polymer coated fertilizers and inorganic coated fertilizers. The organic polymer coated fertilizers are mainly 'osmocote' brand coated fertilizers produced by the American Scotts Company and 'meisfer' and 'NufvicoR' brand coated fertilizers produced by the Japanese Chisso-Asahi Fertilizer Company, wherein the 'osmocote' brand coated fertilizers The coating material used in film fertilizer is alkyd resin or polyurethane polymer. The coated fertilizer produced by using this coating material has a good controll...

Examples

preparation example Construction

[0015] The preparation method of the coating film composition solution is carried out according to the following steps successively:

[0016] a. First, crush the recovered polystyrene plastic, and the diameter of the crushed particles is 3-4mm;

[0017] b. Configure organic solvent: mix xylene and diesel engine oil according to the mass ratio, and stir evenly;

[0018] c. After mixing polystyrene plastic particles and additives evenly, stir and mix with organic solvent again at a temperature of 90°C to 130°C;

[0019] d. Feed the fertilizer granules into the fluidized bed and heat to 40°C;

[0020] e. While the heated fertilizer granules flow out gradually through the vulcanized bed, use a nozzle to spray the coating film composition solution onto the surface of the fertilizer granules. After 40 to 50 minutes, the fertilizer with the coating film can be obtained, packaged and put into storage ,Sale.

Embodiment 1

[0022] Add 200kg of granular compound fertilizer into the fluidized bed, heat to 40°C, mix 5kg of recycled waste polystyrene foam with 1.5kg of polyurethane and 0.5kg of gamma-pullulan and dissolve them in 190kg of bismuth In toluene and 10kg diesel engine oil, its heating temperature is 90 DEG C and under stirring and mixing again continuously, the coating film composition solution is sprayed onto the fertilizer granule surface with a nozzle, and the fertilizer with the coating film is obtained through 40 to 50 minutes. The film weight of the obtained controlled-release fertilizer product accounts for 5% of the total weight of the fertilizer, and its nutrient can be controlled and released for 3 months in soil or water at 25°C.

Embodiment 2

[0024] Add 200kg of large granular urea (diameter 3-4mm) fertilizer into the fluidized bed, heat to 50°C, mix 11.2kg of recovered waste polystyrene foam with 2.1kg of chlorinated paraffin and 0.7kg of γ-pullulan After uniformity, dissolve in 190kg xylene and 10kg diesel engine oil together, and the heating temperature is 100°C, and then continue to stir and mix again, spray the coating film composition solution onto the surface of the fertilizer particles with a nozzle, and obtain a coated fertilizer in 45 minutes. For the fertilizer covered with film, the film weight of the obtained controlled-release fertilizer product accounts for 7% of the total weight of the fertilizer, and its nutrient can be controlled and released for 6 months in soil or water at 25°C.

technical field

[0001] The invention discloses a composition for gradually spraying coating liquid on the surface of fertilizer granules by fluidized bed equipment to form a film with controlled release function, and is especially suitable for the fertilizer controlled release coating film composition and its preparation method. Background technique

[0002] At present, there are mainly two types of coated controlled-release fertilizers at home and abroad, namely organic polymer coated fertilizers and inorganic coated fertilizers. The organic polymer coated fertilizers are mainly 'osmocote' brand coated fertilizers produced by the American Scotts Company and 'meisfer' and 'NufvicoR' brand coated fertilizers produced by the Japanese Chisso-Asahi Fertilizer Company, wherein the 'osmocote' brand coated fertilizers The coating material used in film fertilizer is alkyd resin or polyurethane polymer. The coated fertilizer produced by using this coating material has a good controll...

Examples

preparation example Construction

[0015] The preparation method of the coating film composition solution is carried out according to the following steps successively:

[0016] a. First, crush the recovered polystyrene plastic, and the diameter of the crushed particles is 3-4mm;

[0017] b. Configure organic solvent: mix xylene and diesel engine oil according to the mass ratio, and stir evenly;

[0018] c. After mixing polystyrene plastic particles and additives evenly, stir and mix with organic solvent again at a temperature of 90°C to 130°C;

[0019] d. Feed the fertilizer granules into the fluidized bed and heat to 40°C;

[0020] e. While the heated fertilizer granules flow out gradually through the vulcanized bed, use a nozzle to spray the coating film composition solution onto the surface of the fertilizer granules. After 40 to 50 minutes, the fertilizer with the coating film can be obtained, packaged and put into storage ,Sale.

Embodiment 1

[0022] Add 200kg of granular compound fertilizer into the fluidized bed, heat to 40°C, mix 5kg of recycled waste polystyrene foam with 1.5kg of polyurethane and 0.5kg of gamma-pullulan and dissolve them in 190kg of bismuth In toluene and 10kg diesel engine oil, its heating temperature is 90 DEG C and under stirring and mixing again continuously, the coating film composition solution is sprayed onto the fertilizer granule surface with a nozzle, and the fertilizer with the coating film is obtained through 40 to 50 minutes. The film weight of the obtained controlled-release fertilizer product accounts for 5% of the total weight of the fertilizer, and its nutrient can be controlled and released for 3 months in soil or water at 25°C.

Embodiment 2

[0024] Add 200kg of large granular urea (diameter 3-4mm) fertilizer into the fluidized bed, heat to 50°C, mix 11.2kg of recovered waste polystyrene foam with 2.1kg of chlorinated paraffin and 0.7kg of γ-pullulan After uniformity, dissolve in 190kg xylene and 10kg diesel engine oil together, and the heating temperature is 100°C, and then continue to stir and mix again, spray the coating film composition solution onto the surface of the fertilizer particles with a nozzle, and obtain a coated fertilizer in 45 minutes. For the fertilizer covered with film, the film weight of the obtained controlled-release fertilizer product accounts for 7% of the total weight of the fertilizer, and its nutrient can be controlled and released for 6 months in soil or water at 25°C.