A kind of preparation method of multifunctional composite water-retaining slow-release fertilizer
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A slow-release fertilizer and multi-functional technology, applied in the direction of urea compound fertilizer, organic fertilizer, ammonium salt fertilizer, etc., can solve the problems of refractory degradation, high fertilizer cost, inconsistent fertilizer release speed and crop growth needs
Active Publication Date: 2021-03-12
HENAN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
[0004] However, there are still many problems in the research field of water-retaining slow-release and controlled-release fertilizers that need to be solved urgently. For example, the cost of obtained fertilizers is high, the release rate of fertilizers is inconsistent with the growth needs of crops, and it is difficult to degrade.
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Embodiment 1
[0026] Add 5.0mL of 1% carboxymethylcellulose solution to the beaker, then add urea 2.000g, acrylamide 1.792g, maleic anhydride modified cyclodextrin 0.208g, N,N-methylenebisacrylamide 0.043 g, 1.0mL of ammonium persulfate solution, 1.0mL of vitamin C solution, after fully mixing, raise the temperature to 60°C, and react for 0.1 hour to obtain a water-retaining slow-release fertilizer, whose swelling and slow-release curves are as follows figure 1 shown.
Embodiment 2
[0028] Add 5.0 mL of 1% carboxymethylcellulose solution to the beaker, then add 2.000 g of urea, 1.792 g of acrylamide, 0.208 g of modified cyclodextrin, and 1.200 g of halloysite loaded with urea (12.7% urea loading), N,N-methylenebisacrylamide 0.043g, ammonium persulfate solution 1.0mL, vitamin C solution 1mL, mix well, raise the temperature to 60°C, and react for 0.2 hours. Water-retaining slow-release fertilizer is obtained, and its swelling and slow-release curves are as follows: figure 2 shown.
Embodiment 3
[0030] 5.0mL of 1% carboxymethylcellulose solution in a beaker, then add 2.50g of urea, 0.896g of acrylamide, 1.000g of acrylic acid, 0.104g of modified cyclodextrin, 0.570g of halloysite loaded with urea (urea loading capacity 12.7 %), N, N-methylenebisacrylamide 0.0273g, ammonium persulfate solution 1.0mL, vitamin C solution 1.0mL, mix well, raise the temperature to 60°C, and react for 0.2 hours. Water-retaining slow-release fertilizer is obtained, and its swelling and slow-release curves are as follows: image 3 shown.
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Abstract
The invention belongs to the field of water-retaining slow-release and controlled-release fertilizers, and specifically discloses a preparation method of water-retaining slow- and controlled-release fertilizers based on cellulose, halloysite and cyclodextrin: adding cellulose derivatives, polymerizable Cyclodextrin, water-soluble monomer, halloysite loaded with urea, cross-linking agent, initiator, and then heated to a certain temperature, free radical polymerization occurs, and a new type of water-retaining slow-release fertilizer is obtained. This water-retaining slow-release fertilizer utilizes the inclusion property of cyclodextrin on urea and the special tubular structure of halloysite, so that there are multiple interactions between urea and the carrier, thus showing a special release performance, and at the same time, has a certain water retention The preparation method is simple and the application prospect is wide.
Description
technical field [0001] The invention belongs to the technical field of water-retaining slow-release and controlled-release fertilizers, and in particular relates to the preparation of multifunctional water-retaining and slow-release fertilizers containing halloysite and cyclodextrin through radical polymerization. Background technique [0002] Chemical fertilizers have made an important contribution to increasing agricultural production. At the same time, fertilization also pollutes the environment and crops, and increases the cost of agricultural production. Therefore, how to improve the utilization rate of fertilizers and reduce the frequency of fertilization has become an important subject of research, which promotes the development and application of various slow-release fertilizers. On the other hand, water is also an important factor restricting agricultural development. Moisture not only directly affects crop growth, but also plays an important role in fertilizer eff...
Claims
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