Polymer sulfur coated controlled release fertilizer and preparing method thereof

Abstract

The invention discloses a polymer sulfur coated slow-release fertilizer and a manufacturing method thereof, first of all, implement granulated fertilizer coating through melting urea, next, reaction of two or above polymer precursors on the surface of granulated fertilizer coated with urine will be achieved to form polymer wrapper, after that, coat the polymer wrapper with modified molten sulfur, and the outermost layer coating is with naturally modified polymer wax combination, which greatly reduces coating materials dosage, improves controlled release properties and nutrient content, the product toughness, abrasive resistance and impact resistance is favorable, low comprehensive cost, membrane materials can be degraded, and of eco-environment protection.

Description

technical field [0001] The invention relates to a polymer sulfur-coated slow-release fertilizer and a manufacturing method thereof, belonging to the field of fertilizer manufacturing, and more specifically relates to granular fertilizers according to molten urine treatment layer, polymer coating, sulfur coating, natural modification polymerization Slow-release fertilizers coated sequentially with wax composition coatings, less coating materials, good controlled release, good toughness, wear resistance and impact resistance, high nutrient content, high fertilizer utilization rate, low overall cost, Suitable for all kinds of granular fertilizers, not limited by fertilizer type and particle size, the membrane material can be degraded in the soil, and is environmentally friendly. Background technique [0002] Fertilizer is the food of food and an important means of agricultural production, which plays a vital role in increasing food production. my country is the country with th...

AI Technical Summary

Problems solved by technology

[0004] Existing sulfur-coated slow-release fertilizers have too thick a sulfur coating, resulting in low nutrient content in the coating and low economic efficiency, and the sulfur-coated material is relatively brittle, has poor toughness, low impact resistance and wear resistance, and slow-release performance Unstable, blasting release in the early stage, nutrient locking in the later stage cannot be released, and nutrients cannot be supplied according to the nutrient demand in the growth process of crops, and the use of sealing materials cannot be completely improved, and it is not easy to degrade, expensive, complex production process, high equipment requirements , large investment and other issues

[0005] And some patents are published to coat a layer of polymer on the sulfur layer again. Although the release and impact strength have been improved to a certain extent, such as US5599374, because the polymer material is expensive and the production process is complicated, the membrane material cannot be degraded, and the The clothing rate is still relatively high, and the cost performance is low, which is difficult to be generally accepted by the market

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