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Method for preparing coated straw fiber-based water-retaining slow-release fertilizer

A straw fiber and coated technology, which is applied in the field of preparing coated straw fiber-based water-retaining slow-release fertilizer, can solve the problems of poor water-retaining performance and slow-release effect, waste of straw waste resources, and poor mechanical strength, etc., to achieve It is beneficial to the load capacity and retention, enhances the slow-release effect, and increases the effect of diffusion resistance

Inactive Publication Date: 2019-09-24
INST OF ENVIRONMENT & SUSTAINABLE DEV IN AGRI CHINESE ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a method for preparing coated straw fiber-based water-retaining slow-release fertilizer, which solves the problem of high preparation cost, poor mechanical strength and easy occurrence of fertilizer slow-release fertilizer in the existing carrier slow-release fertilizer. It also solves the problems of waste of resources and environmental pollution caused by straw waste.

Method used

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  • Method for preparing coated straw fiber-based water-retaining slow-release fertilizer

Examples

Experimental program
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Effect test

Embodiment 1

[0030] 1) Extraction of cellulose: Wash and dry the wheat straw to remove impurities, crush it through 20 meshes to obtain straw powder, then add 10% nitric acid solution to the straw powder, the solid-to-liquid ratio is 1:30, Then heat and stir at 85°C for 3 hours. After the extraction is completed, cool to room temperature, and then filter, dry and grind to obtain cellulose powder;

[0031]2) Preparation of cellulose-based superabsorbent resin: add the cellulose powder prepared in step 1) into deionized water, fully stir and disperse in a water bath at 75°C for 30 minutes, then add potassium persulfate and sodium sulfite under nitrogen protection and stir 15min, the total mass ratio of cellulose powder to potassium persulfate and sodium sulfite mixed powder is 1:0.25, then add acrylic acid, urea and N,N-methylenebisacrylamide with a neutralization degree of 70% in sequence, cellulose powder, The mass ratio of acrylic acid, urea and N,N-methylenebisacrylamide is 1:1:0.2:0.05....

Embodiment 2

[0035] 1) Extraction of cellulose: the corn stalks were washed and dried to remove impurities, crushed to 20 meshes to obtain straw powder, and then 10% nitric acid solution was added to the straw powder with a solid-to-liquid ratio of 1:50. Then heat and stir at 110°C for 5 hours. After the extraction, cool to room temperature, and then filter, dry and grind to obtain cellulose powder;

[0036] 2) Preparation of cellulose-based superabsorbent resin: add the cellulose powder prepared in step 1) into deionized water, fully stir and disperse in a water bath at 80°C for 50 minutes, then add potassium persulfate and sodium sulfite under nitrogen protection and stir 20min, the total mass ratio of cellulose powder and potassium persulfate and sodium sulfite (the mass ratio of potassium persulfate and sodium sulfite is 1:1) is 1:0.4, and then add acrylic acid, urea and N with a neutralization degree of 70% in sequence. , N-methylenebisacrylamide, make the mass ratio of cellulose powd...

Embodiment 3

[0040] 1) Extraction of cellulose: wash and dry rapeseed stalks to remove impurities, crush them through 20 meshes to obtain straw powder, then add 10% nitric acid solution to the straw powder, the solid-to-liquid ratio is 1:50, Then heat and stir at 100°C for 4 hours. After the extraction, cool to room temperature, and then filter, dry and grind to obtain cellulose powder;

[0041] 2) Preparation of cellulose-based superabsorbent resin: Add the cellulose powder prepared in step 1) into deionized water, fully stir and disperse in a water bath at 70°C for 30 minutes, then add potassium persulfate and sodium sulfite under nitrogen protection and stir 30min, the total mass ratio of cellulose powder and potassium persulfate and sodium sulfite (the mass ratio of potassium persulfate and sodium sulfite is 1:1) is 1:0.3, and then add acrylic acid, urea and N , N-methylenebisacrylamide, the mass ratio of cellulose powder, acrylic acid, urea and N,N-methylenebisacrylamide is 1:1:0.3:0....

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Abstract

The invention discloses a method for preparing a coated straw fiber-based water-retaining slow-release fertilizer. According to the method, a straw cellulose polysaccharide chain is used as a framework; acrylic acid and acrylamide substances generated by a reaction of acrylic acid and urea are grafted to a cellulose main chain; then crosslinking is carried out by a cross-linking agent to form a polymer with a three-dimensional network structure; meanwhile, the polymer with the three-dimensional network structure and polyvinyl alcohol interpenetrate through each other to form high-water-absorbing resin with a semi-interpenetrating network structure; then the high-water-absorbing resin with the semi-interpenetrating network structure coats fertilizer particles; and a mixed solution of polyvinyl alcohol, sodium alginate and carboxymethyl cellulose forms a membrane by crosslinking to coat the outermost layer of the fertilizer particles to obtain the coated straw fiber-based water-retaining slow-release fertilizer. The fertilizer disclosed by the invention has good mechanical properties and water absorption performance, has excellent slow release effects on the fertilizer, reduces nutrient loss, improves the utilization rate of the fertilizer, reduces maintenance cost of farmland in the later period, and improves the yield and quality of crops. The method provided by the invention has the advantages that the operation method is simple and convenient, cost is low, the additional value of straw application is improved, and the new idea of straw resourceful utilization is further expanded.

Description

technical field [0001] The invention relates to the technical field of material engineering, in particular to a method for preparing a coated straw fiber-based water-retaining slow-release fertilizer. Background technique [0002] Crop straw is a huge amount of natural polymer resources accompanied by uninterrupted agricultural production. my country is a large agricultural country with a huge amount of straw, with an annual output of more than 900 million tons, but the comprehensive utilization rate of straw resources is still low. How to rationally utilize renewable straw cellulose resources is an important content of current environmental green technology, and it is also One of the key points of current research work in the field of resource development and ecological environment protection. On the other hand, in the process of agricultural production in our country, a large amount of nitrogen and phosphate fertilizers are used and the utilization rate is too low, resulti...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/04C08F251/02C08F261/04C08F220/06C08F222/38C05G3/80
CPCC05C9/00C05B7/00C05G3/00C08F251/02C08F261/04C05G5/30C05G3/80C08F220/06
Inventor 王惟帅杨世琦邢磊
Owner INST OF ENVIRONMENT & SUSTAINABLE DEV IN AGRI CHINESE ACADEMY OF AGRI SCI
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