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Method for preparing super absorbent resin from sorghum straws

A technology of superabsorbent resin and sorghum straw, which is applied in the field of preparation of superabsorbent resin from sorghum straw, which can solve the problems of high reaction temperature and low water absorption rate, and achieve the effects of simple synthesis process, large market competitiveness and cost reduction

Inactive Publication Date: 2022-02-25
WEIFANG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this patented technology makes full use of straw resources, its reaction temperature is high and its water absorption rate is not high, so it is mainly used in the agricultural field

Method used

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  • Method for preparing super absorbent resin from sorghum straws
  • Method for preparing super absorbent resin from sorghum straws
  • Method for preparing super absorbent resin from sorghum straws

Examples

Experimental program
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Effect test

Embodiment 1

[0076] Weigh 10.0g of sodium hydroxide, measure 400mL of deionized water, prepare 2.5% sodium hydroxide solution, weigh 50.0g of sorghum straw powder that has passed through a 100 mesh sieve, and mix the sorghum straw powder with 2.5% hydroxide under stirring The sodium solution was mixed evenly in a three-necked bottle, and soaked for 12 hours. Then weigh 50.0g sodium hydroxide, measure 150mL deionized water, prepare a 33.3% sodium hydroxide solution, add two-thirds of the 33.3% sodium hydroxide solution dropwise to the above-mentioned three-necked bottle after soaking, at 30°C Heat in a water bath for alkalization for 1.5 hours. Weigh 34.8g sodium chloroacetate, measure 100mL deionized water, prepare sodium chloroacetate solution, add dropwise to the solution after alkalization reaction, adjust the temperature of the water bath to 75°C, and pour the solution into In a stainless steel pan, heat in an oven at 70°C for 2 hours, dry, pulverize, and wash to obtain carboxymethyl ...

Embodiment 2

[0079] Weigh 12.0g of sodium hydroxide, measure 400mL of deionized water, prepare 3% sodium hydroxide solution, weigh 50.0 g of sorghum straw powder that has passed through a 100 mesh sieve, and mix the sorghum straw powder with 3% hydroxide under stirring The sodium solution was mixed evenly in a three-necked bottle, and soaked for 12 hours. Then weigh 50.0g sodium hydroxide, measure 150mL deionized water, prepare a 33.3% sodium hydroxide solution, add two-thirds of the 33.3% sodium hydroxide solution dropwise to the above-mentioned three-necked bottle after soaking, at 30°C Heat in a water bath for alkalization for 1.5 hours. Weigh 36.5g sodium chloroacetate, measure 100mL deionized water, prepare sodium chloroacetate solution, add dropwise to the solution after alkalization reaction, adjust the temperature of the water bath to 75°C, and pour the solution into In a stainless steel pan, heat in an oven at 70°C for 2 hours, dry, pulverize, and wash to obtain carboxymethyl sor...

Embodiment 3

[0082] Weigh 14.0g of sodium hydroxide, measure 400mL of deionized water, prepare 3.5% sodium hydroxide solution, weigh 50.0g of sorghum straw powder that has passed through a 100 mesh sieve, and mix the sorghum straw powder with 3.5% hydroxide The sodium solution was mixed evenly in a three-necked bottle, and soaked for 12 hours. Then weigh 50.0g sodium hydroxide, measure 150mL deionized water, prepare a 33.3% sodium hydroxide solution, add two-thirds of the 33.3% sodium hydroxide solution dropwise to the above-mentioned three-necked bottle after soaking, at 30°C Heat in a water bath for alkalization for 1.5 hours. Weigh 42.6g sodium chloroacetate, measure 100mL deionized water, prepare sodium chloroacetate solution, add dropwise to the solution after alkalization reaction, adjust the temperature of water bath to 35°C, and pour the solution into In a stainless steel pan, heat in an oven at 70°C for 2 hours, dry, pulverize, and wash to obtain carboxymethyl sorghum cellulose w...

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Abstract

The invention discloses a method for preparing super absorbent resin from sorghum straws, the method comprises the following steps: S1, soaking crushed sorghum straw powder in a low-concentration alkali solution, then adding a high-concentration alkali solution for alkalization reaction, and then adding sodium chloroacetate and the high-concentration alkali solution for etherification reaction to obtain carboxymethyl sorghum cellulose; s2, mixing acrylic acid and a neutralizer for a neutralization reaction, and obtaining acrylic acid and a salt solution thereof; s3, mixing the carboxymethyl sorghum cellulose with an oxidizing agent, a cross-linking agent, acrylic acid, a salt solution of the acrylic acid and a reducing agent, introducing nitrogen, and carrying out a stirring reaction; and S4, after the reaction is finished, heating and carrying out heat preservation. 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, and the water absorption is up to 1250-1550g / g. The method is simple in process and low in preparation cost, and 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 a method for preparing a superabsorbent resin used in the fields of agriculture, forestry, and industry, and in particular to a method for preparing a superabsorbent resin by the sorghum straw method, which is prepared by using sorghum straw as a raw material and modified by carboxymethylation Carboxymethyl sorghum cellulose with a high degree of substitution is used as a matrix to graft and polymerize monomer acrylic acid to prepare a superabsorbent resin with a water absorption rate higher than 1200 times. Background technique [0002] Sorghum, one of the most important miscellaneous grain crops in China, has multiple stress resistances such as drought tolerance, waterlogging tolerance, and salt-alkali tolerance. Domestic provinces and cities with large sorghum planting areas are mainly distributed in Inner Mongolia, Jilin, Guizhou, Heilongjiang, Liaoning, Shanxi and other provinces and cities. In recent years, with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/02C08F220/06C08F222/38C08B11/12
CPCC08F251/02C08B11/12C08F220/06C08F222/385
Inventor 廉萌李海洋李春霞张荣坤赵云龙任泽凯相兴振单硕解豪清
Owner WEIFANG UNIV OF SCI & TECH
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