Method for producing reclaimed thermoplastic resin and thermosetting resin multi-layer composite coated controlled-release fertilizer

Abstract

The invention provides a multi-player compounded film-coated controlled release fertilizer which considers recycled thermoplastic resin as an inner coating layer and considers thermosetting resin as an outer coating layer and a production method thereof. The invention is that firstly the recycled thermoplastic resin is mixed with mineral powder and corn powder in certain proportion to be dissolved in the mixed solvent of n-butyl acetate and amyl acetate; the material is sprayed at fertilizer granules by a twin fluid nozzle in a heated boiling fluidized bed to form a thermoplastic resin film with the function of controlling and releasing nutrient which is transferred into a heated rotating drum fluidized bed to be sprayed with the mixed fluid of the thermosetting resin with curing agent and thinner; under the condition of rotating heating, the fast solidification reaction occurs at the outer layer of the thermoplastic resin filer to form a compact and bright thermosetting resin film. The product integrates the advantages of two kinds of resin films to realize the perfect combination of toughness and elasticity and achieve the same controlling and releasing effect while the film material consumption is reduced by 20 percent to 50 percent, which reduces the cost and as well as improves the interior controlling and releasing effect and the appearance quality of the product, and the product is applicable to the large scale industrialized production and popularization.

Description

(1) Technical field

[0001] The invention belongs to the field of slow and controlled-release fertilizer production. The solution of recycled thermoplastics is sprayed on the surface of compound (mixed) fertilizers or urea granules to form an inner coating, and then a thermosetting resin is used to cure the inner coating of the thermoplastic resin to form an extremely thin outer coating. A multi-layer composite coating controlled-release fertilizer with a layer reaction film and a production method thereof. (2) Background technology

[0002] At present, the types of film-coated controlled-release fertilizers at home and abroad mainly include polymer-coated fertilizers and inorganic-coated fertilizers. Inorganic coated fertilizers are represented by sulfur-coated urea (SCU) (US3295950) developed by TVA Corporation of the United States. Although the production cost is not high, it is difficult to strictly control the release rate and time of its nutrients. Since the sulfur mem...

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