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A kind of starch and lotus leaf powder blend coating material and its preparation method and application

A coating material, lotus leaf powder technology, applied in the application, fertilizer mixture, agriculture and other directions, can solve the problems of high cost, low proportion, limited wide application, etc., to achieve the effects of convenient operation, excellent performance, and easy availability of raw materials

Active Publication Date: 2018-09-21
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high cost, such as the cost of one strand of sulfur-coated and organic polymer-coated urea is 3 to 8 times that of urea, which limits its wide application on field crops, and is mostly used in non-agricultural markets (golf courses, Nursery, professional lawn, landscape gardening), only 10% is used in agriculture, and it is mainly used in vegetables with high economic value, strawberries, citrus, etc., and the proportion used in field crops is even less

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A film-coated slow-release and controlled-release fertilizer, specifically prepared through the following process:

[0028] (1) Preparation of starch / lotus leaf powder coating material dispersion

[0029] Add 80ml of distilled water, 8.0g of wheat starch, 1.0g of lotus leaf powder, 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°C After gelatinization, add 0.2 g of cross-linking agent N,N'-methylenebisacrylamide and 0.2 g of glycerol, reflux at 90-100°C for 2-3 hours, cool and discharge.

[0030] (2) Preparation of coated slow-release fertilizer

[0031] 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 .

[0032]Slow and controll...

Embodiment 2

[0034] A coated slow-release fertilizer, the preparation process of which is the same as in Example 1, except that corn starch is used instead of wheat starch.

[0035] Under the condition of 25°C, the nutrient release period of the coated slow-release fertilizer was tested by the water soaking method, expressed as the number of days required for the cumulative nutrient release rate to reach 80%. Put a certain amount of coated slow-controlled release fertilizer into water, and the nutrients in the coated slow-controlled release fertilizer will dissolve into the water through the coating material. After a certain number of days, test the total content of nitrogen, phosphorus and potassium respectively, that is, according to GB / T8572-2001 standard to test the total content of nitrogen, according to GB / T8573-1999 standard to test the total content of phosphorus, according to GB / T8574-1988 standard to test the total content of potassium, the result is the nutrient release of the p...

Embodiment 3

[0037] A film-coated slow-release and controlled-release fertilizer, specifically prepared through the following process:

[0038] (1) Preparation of coating material dispersion

[0039] Add 82ml of distilled water, 9.0g of wheat starch, 2.0g of lotus leaf powder, and 0.2g of humic acid into a reaction kettle equipped with a stirrer, a thermometer, a condenser and a heating device, stir at room temperature for 1 to 2 hours, and then heat to 80~ Gelatinize at 90°C, then add 0.2g of cross-linking agent N,N'-methylenebisacrylamide and 0.2g of glycerol, reflux at 90-100°C for 2-3 hours, cool and discharge.

[0040] (2) Preparation of coated slow-release fertilizer

[0041] With embodiment 1.

[0042] Under the condition of 25°C, the nutrient release period of the coated slow-release fertilizer was tested by the water soaking method, expressed as the number of days required for the cumulative nutrient release rate to reach 80%. Put a certain amount of coated slow-controlled rele...

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Abstract

The invention discloses a starch and lotus leaf powder blended coating material as well as a preparation method and an application thereof. The coating material comprises starch, lotus leaf powder, humic acid and a crosslinking agent, wherein the starch accounts for 75%-85% of the total mass of the coating material, the lotus leaf powder accounts for 10%-20% of the total mass of the coating material, the humic acid accounts for 0%-10% of the total mass of the coating material and the content is not zero, and the crosslinking agent accounts for 0.2%-5.0% of the total mass of the coating material. The formulated amount of the starch, the lotus leaf powder and the humic acid is put in a reaction kettle, water is added, the mixture is stirred and mixed uniformly, heated to 60-90 DEG C and gelatinized, then the formulated amount of the crosslinking agent is added, back flow is performed at 90-100 DEG C, and the mixture has a crosslinking reaction; then stirring and cooling discharging are performed, and a starch and lotus leaf powder blended coating material contained aqueous dispersion is prepared. Controlled release fertilizer for different release stages can be prepared through adjustment of component composition of the coating material and the ratio of the coating material to granulated fertilizer. The controlled release fertilizer prepared from the coating material has the advantages that raw materials are widely sourced, low in cost and easy to obtain, and a preparation method is simple and facilitates easiness in industrial production.

Description

technical field [0001] The invention belongs to the technical field of materials and fertilizers, and in particular relates to a starch and lotus leaf powder blend coating material and its preparation method and application. Background technique [0002] Fertilizer is one of the most important means of production in agricultural production and the material basis for the sustainable development of agriculture. In recent years, due to the loss and inefficient use of fertilizers, serious resource waste and huge economic losses have been caused, and more importantly, serious pollution has been caused to the human body, the atmosphere, soil and food. Therefore, how to improve the utilization rate of fertilizers and organically combine the application of fertilizers with the yield, quality and environmental protection of crops has become the focus of special attention in the field of fertilizer research. [0003] Before the 1980s, developed countries such as Europe, America, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00
Inventor 徐祖顺李庆李全涛庞龙栗静
Owner HUBEI UNIV
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