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Preparation method of hydrogel for nitrogenous fertilizer

A technology of hydrogel and nitrogen fertilizer, applied in fertilizer forms, organic fertilizers, fertilization devices, etc., can solve problems such as not easy to degrade, and achieve the effect of simple operation process

Active Publication Date: 2015-04-29
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Based on the characteristics of water-retaining agents, combined with chemical fertilizers, it is a new method of water-saving and efficient use of chemical fertilizers in recent years. However, the product type of water-retaining agents is mainly acrylamide---acrylic acid salt copolymerized cross-linked products, which are not easy to degrade, and traditional chemical fertilizers A series of disadvantages have forced researchers to turn to the research and development of degradable materials that are in line with the interests of nature. How to ensure effective fertilizer supply to crops without causing harm to the soil is the key research and breakthrough content of the present invention

Method used

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  • Preparation method of hydrogel for nitrogenous fertilizer

Examples

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Comparison scheme
Effect test

Embodiment １

[0041] Example 1: The preparation method of this nitrogenous fertilizer hydrogel, concrete operation is as follows:

[0042] (1) Bagasse preparation process

[0043] The bagasse raw material is air-dried, and the dryness of the air-dried raw material varies according to the air humidity in different regions and seasons. In this embodiment, the dryness is 75%. The bagasse is ground and then sieved (passing 40 mesh but not 60 mesh), Get qualified raw materials.

[0044] (2) Organic solvent extraction process

[0045] Take 3.8g of absolutely dry qualified bagasse material (because the dryness of the raw material is 75%, the actual air-dried material is 5.0g), wrap it with qualitative filter paper, and put it into 50ml of benzene-ethanol mixture (1:3ml / ml, volume ratio, the volumes of benzene and ethanol are 12.5ml and 37.5ml respectively) in the Soxhlet extractor for 6h. After the extraction is completed, air-dry naturally and set aside.

[0046] (3) Extraction process o...

Embodiment 2

[0058] Example 2: The preparation method of this nitrogenous fertilizer hydrogel, concrete operation is as follows:

[0059] (1) Bagasse preparation process

[0060] The bagasse raw material is air-dried, and the dryness of the air-dried raw material varies according to the air humidity in different regions and seasons. In this embodiment, the dryness is 85%, and the bagasse is ground and then sieved (passing 60 mesh but not 80 mesh). Get qualified raw materials.

[0061] (2) Organic solvent extraction process

[0062] Take 15.0g of absolutely dry qualified bagasse material (because the dryness of the raw material is 85%, the actual air-dried material is 17.6g), wrap it with qualitative filter paper, and put it into 500ml of benzene-ethanol mixture (1:1ml / ml volume ratio , the volumes of benzene and ethanol are both 250ml) in a Soxhlet extractor for 9 hours, after the extraction is completed, air-dry naturally and set aside.

[0063] (3) Extraction process of comprehensiv...

Embodiment 3

[0075] Example 3: The preparation method of environment-friendly nitrogenous fertilizer hydrogel, concrete operation is as follows:

[0076] (1) Bagasse preparation process

[0077] The bagasse raw material is air-dried, and the dryness of the air-dried raw material varies according to the air humidity in different regions and seasons. In this embodiment, the dryness is 95%. The bagasse is ground and then sieved (passing 80 mesh but not 100 mesh), Get qualified raw materials.

[0078] (2) Organic solvent extraction process

[0079] Take 23.8g of absolutely dry qualified bagasse material (because the dryness of the raw material is 95%, the actual air-dried material is 25.0g), wrap it with qualitative filter paper, and put it into 2000ml of benzene-ethanol mixture (3:1ml / ml volume ratio , the volumes of benzene and ethanol are 1500ml and 500ml respectively) in a Soxhlet extractor for 12 hours, after the extraction is completed, air-dry naturally and set aside.

[0080] ...

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Abstract

The invention discloses a preparation method of hydrogel for nitrogenous fertilizer. According to the method, bagasse is taken as the raw material and subjected to grinding, screening, benzene-alcohol extraction and acidic sodium chlorite which is used for removing lignin and preparing holocellulose, then the bagasse is subjected to selective oxidation and low-temperature dissolution treatment, an oxidized holocellulose dissolved solution and bean dregs after grinding and screening are blended homogeneously and formed in a sodium sulfate solution, and environment-friendly hydrogel for the nitrogenous fertilizer is obtained after cold drying. The environment-friendly hydrogel used for the nitrogenous fertilizer and prepared with the method is white granules, has a soil water retaining function, contains more nitrogen, can be degraded completely and does not have side effects on soil.

Description

technical field [0001] The invention relates to a method for preparing an environment-friendly nitrogen fertilizer hydrogel. The solid waste in the bean product manufacturing industry --- bean dregs is used as a nutrient source, and it is carried in a modified cellulose gel to prepare a hydrogel that can be used in soil The invention relates to a hydrogel capable of retaining water and releasing nitrogen fertilizer slowly, and belongs to the technical field of natural polymer modification. Background technique [0002] Cellulose is the most widely sourced, most abundant, and cheap renewable resource on earth. Its polymers have excellent properties such as high degree of polymerization, stable structure, biodegradability, good biocompatibility, and derivatization, and are widely used It is widely used in textile, light industry, chemical industry, national defense, petroleum, medicine, environmental protection and energy sectors. In recent years, oil resources have been dec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G5/00
CPCC05F5/006C05G3/00C05G5/00
Inventor 刘其星高欣张恒
Owner KUNMING UNIV OF SCI & TECH
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