Method for preparing nitrogen and potassium-containing super absorbent resin from carboxymethyl sorghum cellulose

A technology of superabsorbent resin and cellulose, which is applied in the field of high water absorption of nitrogen-containing potassium, can solve the problems of high reaction temperature and low water absorption, and achieve the effects of simple synthesis process, increased water permeability and high yield

Inactive Publication Date: 2022-01-11
WEIFANG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this patented technology makes full use of carboxymethyl cellulose, its reaction temperature is high and its water absorption rate is not high

Method used

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  • Method for preparing nitrogen and potassium-containing super absorbent resin from carboxymethyl sorghum cellulose
  • Method for preparing nitrogen and potassium-containing super absorbent resin from carboxymethyl sorghum cellulose
  • Method for preparing nitrogen and potassium-containing super absorbent resin from carboxymethyl sorghum cellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Weigh 12.43g of potassium hydroxide, measure 32.0mL of deionized water, prepare potassium hydroxide solution, and neutralize 20g (18.87mL) of acrylic acid under the conditions of cooling and stirring in an ice-water bath to prepare acrylic acid and its potassium salt solution , where the degree of neutralization of acrylic acid is 80%. Weigh 5.0g carboxymethyl sorghum cellulose, 5.0g acrylamide, 100mg ammonium persulfate, 75mg sodium bisulfite, 50.0mg N,N'-methylene bisacrylamide, measure 70.0mL deionized water, all Add it into the reactor, and pour the prepared acrylic acid and its potassium salt solution into the reactor, and stir at room temperature for 2 hours to make it evenly mixed. Stir and heat under the protection of nitrogen, and control the heating rate at the same time to increase the temperature of the water bath slowly. When the temperature rises to 25-35°C, stop stirring, and then gradually increase the temperature. It reacted in this temperature range f...

Embodiment 2

[0053] Weigh 10.88g of potassium hydroxide, measure 22.0mL of deionized water, prepare potassium hydroxide solution, and neutralize 20g (18.87mL) of acrylic acid under the conditions of cooling and stirring in an ice-water bath to prepare acrylic acid and its potassium salt solution , where the degree of neutralization of acrylic acid is 70%. Weigh 2.7g carboxymethyl sorghum cellulose, 4.0g acrylamide, 250mg ammonium persulfate, 187.5mg sodium bisulfite, 100.0mg N,N'-methylenebisacrylamide, measure 70.0mL deionized water, All were added into the reactor, and the prepared acrylic acid and its potassium salt solution were poured into the reactor, and stirred at room temperature for 2 hours to make it evenly mixed. Stir and heat under the protection of nitrogen, and control the heating rate at the same time to increase the temperature of the water bath slowly. When the temperature rises to 25-35°C, stop stirring, and then gradually increase the temperature. It reacted in this te...

Embodiment 3

[0056] Weigh 9.33g of potassium hydroxide, measure 26.0mL of deionized water, prepare potassium hydroxide solution, and neutralize 20g (18.87mL) of acrylic acid under the conditions of cooling and stirring in an ice-water bath to prepare acrylic acid and its potassium salt solution , where the degree of neutralization of acrylic acid is 60%. Weigh 3.9g carboxymethyl sorghum cellulose, 3.3g acrylamide, 200mg ammonium persulfate, 150mg sodium bisulfite, 60.0mg N,N'-methylene bisacrylamide, measure 70.0mL deionized water, all Add it into the reactor, and pour the prepared acrylic acid and its potassium salt solution into the reactor, and stir at room temperature for 2 hours to make it evenly mixed. Stir and heat under the protection of nitrogen, and control the heating rate at the same time to increase the temperature of the water bath slowly. When the temperature rises to 25-35°C, stop stirring, and then gradually increase the temperature. It reacted in this temperature range f...

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Abstract

The invention discloses a method for preparing nitrogen and potassium-containing super absorbent resin from carboxymethyl sorghum cellulose, which comprises the following steps: S1, mixing acrylic acid and potassium persulfate for neutralization reaction to obtain an acrylic acid and acrylic acid potassium salt solution; S2, mixing the carboxymethyl sorghum cellulose with acrylamide, an oxidizing agent, a cross-linking agent, the acrylic acid and acrylic acid salt solution and a reducing agent, introducing nitrogen, carrying out a stirring reaction, and stopping stirring when the temperature is raised to 25-35 DEG C; and S3, conducting heating to 95-100 DEG C, carrying out heat preservation for 1.5-2.5 h, stopping introducing nitrogen, and conducting cooling to obtain the nitrogen and potassium-containing super absorbent resin. The water absorption performance and the water retention performance of the super absorbent resin prepared by the method are 2-3 times of those of similar products in the current market, the process is low in preparation cost, and the super absorbent resin has huge application prospects in the industries of soil moisture retention, desert control, agriculture and forestry, flower transportation and the like.

Description

technical field [0001] The present invention relates to the preparation method of nitrogen-containing potassium superabsorbent resin used in the fields of agriculture, forestry and industry, and in particular to a method for preparing nitrogen-containing potassium superabsorbent resin from carboxymethyl sorghum cellulose. The nitrogen-containing potassium superabsorbent resin with a water absorption rate of more than 800 times is prepared after grafting and copolymerizing with monomer acrylic acid, potassium acrylate and acrylamide. Background technique [0002] Carboxymethyl cellulose, a kind of cellulose etherification technology, belongs to anionic cellulose ethers. The glucose residue unit that constitutes cellulose has three hydroxyl groups that can be replaced, so products with different degrees of replacement can be obtained. On average, 1mmol of carboxymethyl group per 1g of dry weight is insoluble in water and dilute acid, but it can swell and increase its dispersi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/02C08F220/56C08F220/06C08B15/04
CPCC08F251/02C08F4/40C08B15/04C08F220/56C08F220/06
Inventor 闫友军张荣坤高洪燕冯丽娟陈星竹冯国乾单硕王学珺耿嘉斌姜荣杰
Owner WEIFANG UNIV OF SCI & TECH
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