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
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[0029] Example 1
[0030] 1) Cellulose extraction: the wheat straw is washed and dried to remove impurities, crushed through 20 meshes to obtain straw powder, and then 10% nitric acid solution is added to the straw powder with a solid-liquid ratio of 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 extract the cellulose powder;
[0031] 2) Preparation of cellulose-based super absorbent resin: add the cellulose powder prepared in step 1) to deionized water, stir and disperse in a water bath at 75°C for 30 minutes, and then add potassium persulfate and sodium sulfite to stir under nitrogen protection 15min, the total mass ratio of cellulose powder to potassium persulfate and sodium sulfite mixed powder is 1:0.25, and then add acrylic acid, urea and N,N-methylenebisacrylamide with a degree of neutralization of 70%, cellulose powder, The mass ratio of acrylic acid, urea and N,N-methylenebisacrylam
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[0034] Example 2
[0035] 1) Extraction of cellulose: the corn stalks are washed and dried to remove impurities, pulverized through 20 meshes to obtain straw powder, and then 10% nitric acid solution is added to the straw powder with a solid-liquid ratio of 1:50. Then heat and stir at 110°C for 5 hours. After the extraction, cool to room temperature, filter, dry and grind to extract the cellulose powder;
[0036] 2) Preparation of cellulose-based super absorbent resin: add the cellulose powder prepared in step 1) to deionized water, stir and disperse in a water bath at 80°C for 50 minutes, and then add potassium persulfate and sodium sulfite under nitrogen protection. 20min, the total mass ratio of cellulose powder mixed with 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-methylene bisacrylamide, make the mass ratio of cellulos
Example Embodiment
[0039] Example 3
[0040] 1) Cellulose extraction: the rape straw is washed and dried to remove impurities, pulverized through 20 meshes to obtain straw powder, and then 10% nitric acid solution is added to the straw powder, the solid-liquid ratio is 1:50, Then heat and stir at 100°C for 4 hours. After the extraction, cool to room temperature, filter, dry and grind to obtain the cellulose powder;
[0041] 2) Preparation of cellulose-based super absorbent resin: Add the cellulose powder prepared in step 1) to deionized water, stir and disperse in a water bath at 70°C for 30 minutes, and then add potassium persulfate and sodium sulfite under nitrogen protection. 30min, the total mass ratio of the mixed powder of cellulose powder, 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 with a neutralization degree of 80%. ,N-methylene bisacrylamide, make the mass ratio of cellulose powder,
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