Starch coating material and application thereof in coated sustained/controlled release fertilizers

A technology of coating material and controlled-release fertilizer, applied in application, fertilizer form, fertilizer mixture, etc., can solve the problem of not really achieving coated slow-release fertilizer, polymer shell is not easy to degrade, and slow-release effect is poor, etc. problem, to achieve the effect of easy popularization and application, simple method and safe production

Active Publication Date: 2011-02-16
HUBEI FORBON TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of inorganic powder as coating material is that the source of material is wide and the price is low. After the fertilizer nutrients are released, the empty shells left in the soil can be broken by themselves, which not only does not pollute the soil environment but also improves the soil structure and provides some micronutrients. The effect of elements; its disadvantage is that the slow and controlled release effect is poor, the nutrient content is low, and it cannot really meet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Preparation of starch coating material dispersion

[0038] Add 90ml of distilled water, 9.0g of wheat starch, 0.3g of methyl cellulose, and 0.2g of humic acid into a reaction kettle equipped with a stirrer, thermometer, condenser and heating device, stir at room temperature for 1 hour, and then heat to 60-90 After gelatinization at ℃, add 0.3g of cross-linking agent N,N / -methylenebisacrylamide and 0.2g of glycerin, reflux at 90-100℃ for 2-3 hours, cool and discharge.

[0039] (2) Preparation of coated slow-release fertilizer

[0040] Put 5 kg of granular urea with a particle size of 3 to 4 mm into the fluidized fluidized bed, preheat to 95 ° C, and spray 5 kg of the above coating material dispersion onto the surface of granular urea from a double-flow nozzle at a spraying speed of about 30 g / min ..

[0041] The nutrient release period of the prepared coated slow and controlled release fertilizer is 65 days.

Embodiment 2

[0043] With embodiment 1, but wheat starch is replaced with cornstarch.

[0044] The nutrient release period of the prepared coated slow and controlled release fertilizer is 38 days.

Embodiment 3

[0046] With embodiment 1, but methyl cellulose is replaced with hydroxyethyl cellulose.

[0047] The nutrient release period of the prepared coated slow and controlled release fertilizer is 52 days.

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PUM

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Abstract

The invention provides a starch coating material and application thereof in coated sustained/controlled release fertilizers. The coating material comprises starch, cellulose, humic acid and a crosslinking agent, wherein the starch accounts for 90.0-95.0% of the coating material by mass; the cellulose accounts for 0-10.0% (except 0) of the coating material by mass; the humic acid accounts for 0-10.0% (except 0) of the coating material by mass; and the crosslinking agent accounts for 0.2-5.0% of the coating material by mass. The starch coating material is used as the coating of the coated sustained/controlled release fertilizers and the coating accounts for 2-30% of the coated sustained/controlled release fertilizers by mass. The coating material has good coating forming property and water resistance and is degradable. Production and application of the material are environment-friendly. The sustained/controlled release fertilizers in different release periods can be prepared by adjusting the proportion of the components of the coating material to the coating material to the granular fertilizers. When the sustained/controlled release fertilizers are prepared by the invention, the used raw materials have wide sources and are cheap and easy to obtain. The preparation method is simple and prone to industrial production.

Description

technical field [0001] The invention relates to a starch-coated material and its application in coated slow-controlled release fertilizers, belonging to the technical field of materials and fertilizers. Background technique [0002] At present, due to the irrational use of chemical fertilizers and the leaching, transformation, and volatilization of chemical fertilizers, a huge waste of resources and serious environmental pollution have been caused. Therefore, how to organically combine fertilizer application with crop yield, quality and environmental protection has become the focus of special attention in the field of fertilizer research. [0003] Since the 1980s, the United States, Japan, Canada and other developed countries have shifted their research focus from scientific fertilization technology to the development of new slow-release fertilizers, and strive to greatly improve the utilization rate of fertilizers by changing the characteristics of chemical fertilizers them...

Claims

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Application Information

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IPC IPC(8): C05G5/00C05G3/00
Inventor 徐祖顺王仁宗邓敏孙振华陈文求
Owner HUBEI FORBON TECH
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