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Preparation method of urea-wrapped cellulose-based super absorbent resin

A technology of water-absorbent resin and cellulose, which is applied in the field of material engineering, can solve the problems of low fertilizer adsorption and slow-release effect, and achieve the effects of improving the slow-release effect, increasing the adsorption amount, and low production cost

Inactive Publication Date: 2017-04-19
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problem of burst release of slow-release fertilizers in superabsorbent resin carriers, and at the same time improve the problems of low absorption of superabsorbent resins on fertilizers and poor slow-release effects, a urea package with quick and easy operation, low production cost and high application value was prepared. Type cellulose-based superabsorbent resin, the purpose of the present invention is to provide a preparation method of urea-wrapped cellulose-based superabsorbent resin

Method used

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  • Preparation method of urea-wrapped cellulose-based super absorbent resin
  • Preparation method of urea-wrapped cellulose-based super absorbent resin
  • Preparation method of urea-wrapped cellulose-based super absorbent resin

Examples

Experimental program
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Effect test

Embodiment 1

[0021] 1) After crushing and sieving, the plant cellulose powder of pine wood with a particle size of ≤0.2mm is added to the deionized water to fully dissolve according to the reaction mass ratio of plant cellulose powder and deionized water of 1:35, and then the solution is transferred Put it into a three-necked flask with a condenser and a nitrogen device, heat and stir in a water bath at 75°C, and feed nitrogen at the same time; after 35 minutes, add ammonium persulfate according to the reaction mass ratio of plant cellulose powder and ammonium persulfate 1:0.4 The solution triggers free radicals. After 4 minutes, the reaction mass ratio of acrylamide to acrylic acid solution is 1:7, the reaction mass ratio of plant cellulose powder to the sum of acrylamide and acrylic acid is 1:12, and the reaction mass ratio of plant cellulose powder to N,N- The reaction mass ratio of methylbisacrylamide 1:0.07 is added in turn to the acrylic acid solution, acrylamide solution, and N,N-met...

Embodiment 2

[0024] 1) Add the plant cellulose powder of cypress with a particle size of ≤0.2mm after crushing and sieving to fully dissolve in deionized water according to the reaction mass ratio of plant cellulose powder and deionized water of 1:40, and then transfer the solution Put it into a three-necked flask with a condenser tube and a nitrogen device, heat and stir in a water bath at 85°C, and feed nitrogen at the same time; after 30 minutes, add ammonium persulfate according to the reaction mass ratio of plant cellulose powder and ammonium persulfate 1:0.25 The solution triggers free radicals. After 3 minutes, the reaction mass ratio of acrylamide to acrylic acid solution is 1:6, the reaction mass ratio of plant cellulose powder to the sum of acrylamide and acrylic acid is 1:12, and the reaction mass ratio of plant cellulose powder to N,N- The reaction mass ratio of methylbisacrylamide 1:0.06 was added in turn to the acrylic acid solution, acrylamide solution, and N,N-methylenebisac...

Embodiment 3

[0027] 1) After pulverization and sieving, the plant cellulose powder of Chinese fir with a particle size of ≤0.2mm is added to the deionized water to fully dissolve according to the reaction mass ratio of plant cellulose powder and deionized water of 1:35, and then the solution is transferred Put it into a three-necked flask with a condenser tube and a nitrogen device, heat and stir in a water bath at 80°C, and feed nitrogen at the same time; after 25 minutes, add ammonium persulfate according to the reaction mass ratio of plant cellulose powder and ammonium persulfate 1:0.35 The solution triggers free radicals. After 4 minutes, the reaction mass ratio of acrylamide to acrylic acid solution is 1:5, the reaction mass ratio of plant cellulose powder to the sum of acrylamide and acrylic acid is 1:11, and the reaction mass ratio of plant cellulose powder to N,N- The reaction mass ratio of methylbisacrylamide 1:0.07 is added in turn to the acrylic acid solution, acrylamide solution...

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Abstract

The invention discloses a preparation method of urea-wrapped cellulose-based super absorbent resin. The method is characterized in that polysaccharide main chains of plant cellulose trigger graft copolymerization acrylic acid and acrylamide monomers through free radicals, and cellulose-based super absorbent resin is prepared; then cellulose-based super absorbent resin powder, a sodium alginate aqueous solution and urea are mixed, a mixture of cellulose-based super absorbent resin powder, the sodium alginate aqueous solution and urea is directly dripped into a calcium chloride aqueous solution for crosslinking, and a cellulose-based super absorbent resin / calcium alginate / urea composite is prepared; a calcium alginate gel layer wraps cellulose-based super absorbent resin and urea, and urea needs to be released through a cellulose-based super absorbent resin layer and the calcium alginate layer, so that the function of slowly releasing urea is achieved. The method is easy to operate, the synthesis cost of the resin is reduced, the super absorbent resin has biodegradability, the controlled and slow fertilizer release function is developed based on the water absorbing and retaining function, soil moisture is maintained, utilization rate of fertilizers is increased, and sustainable and efficient agricultural development is facilitated.

Description

technical field [0001] The invention relates to a preparation method of a superabsorbent resin, in particular to a preparation method of a urea-wrapped cellulose-based superabsorbent resin, and belongs to the technical field of material engineering. Background technique [0002] Sodium alginate, also known as sodium alginate, is a by-product extracted from kelp or sargassum of brown algae. It exists in the cell walls of all marine brown algae and some specific bacteria. It belongs to the linear polyuronic acid polymer electrolyte. The alginic acid molecule is composed of β-D-mannuronic acid (M unit) and α-L-guluronic acid (G unit). Sodium alginate is the product of alginic acid neutralized by sodium hydroxide. Toxicity, good bioadhesion, biocompatibility, biodegradability and gelling properties, so it is widely used in food, medicine, water treatment, agriculture and other fields. [0003] The stretched cross-linked network structure of the superabsorbent resin after absorb...

Claims

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Application Information

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IPC IPC(8): C08F289/00C08F220/06C08F220/58C08F222/38C05G3/00
CPCC05C9/00C05G3/00C08F289/00C05G5/30C08F220/06C08F220/56C08F222/385C05D3/00
Inventor 姚菊明张勇梁熙英
Owner ZHEJIANG SCI-TECH UNIV
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