Rare earth element-rich coating material and preparation method and application thereof

A coating material and rare earth-rich technology, applied in application, fertilizer mixture, fertilization device, etc., can solve problems such as unreasonable application, adverse impact on ecological environment, waste of resources, etc., achieve long fertilizer retention time, promote photosynthesis, improve Yield and Quality Effects

Inactive Publication Date: 2016-01-13
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chemical fertilizer itself has some defects and unreasonable application. In my country, the utilization rate of chemical fertilizer is only about 30%. In order to increase the yield of crops, farmers often apply fertilizer twice or more times, which not only causes a lot of waste of resources, but also It has a negative impact on the ecological environment and has an adverse impact on the economic strategy of sustainable development.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A film-coated slow-release and controlled-release fertilizer, specifically prepared through the following process:

[0030] (1) Preparation of rare earth element-rich coating material:

[0031] Add 75ml of distilled water, 9g of wheat starch, 2g of methylcellulose, 6g of polyvinyl alcohol, and 3g of lanthanide rare earths into a reaction kettle equipped with a stirrer, thermometer, condenser and heating device, stir at room temperature for 1 hour, and heat to 60 gelatinization at ℃, then add 2g of cross-linking agent N,N'-methylenebisacrylamide, 1g of glycerol, reflux at 90℃ for 3 hours, cool and discharge; then take 60g of the emulsion prepared above, add benzene 16g of acrylic emulsion, the solid content of styrene-acrylic emulsion is 46% (wt), then add 3g of light calcium carbonate, and then stir evenly to obtain the coating material rich in rare earth elements.

[0032] (2) Preparation of coated slow-release fertilizer

[0033] Put 5 kg of granular urea with a par...

Embodiment 2

[0036] 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.

[0037] 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 and controlled release fertilizer developed into water, and the nutrients in the coated slow and 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 test the total content of nitrogen, test the total content of phosphorus according to GB / T8573-1999 standard, test the total content of potassium according to GB / T8574-1988 standard. Results The nutrient release peri...

Embodiment 3

[0039] A coated slow-release fertilizer, the preparation process of which is the same as in Example 1, except that methyl cellulose is replaced by hydroxymethyl cellulose.

[0040] 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 and controlled release fertilizer developed into water, and the nutrients in the coated slow and 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 test the total content of nitrogen, test the total content of phosphorus according to GB / T8573-1999 standard, test the total content of potassium according to GB / T8574-1988 standard. Results The nutrient ...

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PUM

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Abstract

The invention discloses a rare earth element-rich coating material and its preparation method and application. The rare earth element-rich coating material comprises 100 parts of starch, cellulose, polyvinyl alcohol, a cross-linking agent, lanthanide rare earth and water, 20-30 parts of a compound modifier and 5-15 parts of a powder filler. The preparation method comprises the following steps: adding starch, cellulose, polyvinyl alcohol, lanthanide rare earth and water into a reaction vessel and stirring and mixing, heating to 60-80 DEG C for gelatinization, adding the cross-linking agent, keeping the temperature at 85-95 DEG C and reacting for 2-3 h to obtain an emulsion, adding the compound modifier and the powder filler in a corresponding proportion into the removed emulsion at room temperature, stirring and mixing uniformly to obtain the rare earth element-rich coating material. By adjusting composition of the coating material and ratio of the coating material and a granulated fertilizer, a slow and controlled release fertilizer with different release periods can be prepared. The slow and controlled release fertilizer is prepared according to the invention. Raw materials have a wide source and are cheap and easily available; and the preparation method is simple and is easy for industrial production.

Description

technical field [0001] The invention belongs to the technical field of materials and fertilizers, and in particular relates to a coating material rich in rare earth elements and its preparation method and application. Background technique [0002] The production and application of chemical fertilizers in my country rank first in the world, making great contributions to the grain production and security of the country and the world. However, there are some defects in chemical fertilizer itself and unreasonable application. The utilization rate of chemical fertilizer in our country is only about 30%. In order to increase the yield of crops, farmers often apply fertilizer twice or multiple times, which not only causes a lot of waste of resources, but also It has a negative impact on the ecological environment and has an adverse impact on the economic strategy of sustainable development. Therefore, the development of long-acting slow- and controlled-release fertilizers has beco...

Claims

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Application Information

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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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