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Method for preparing plant potassium-containing super absorbent resin by corncob one-pot method

A technology for super absorbent resin and corn cob, which is applied to the field of preparing plant potassium-containing super absorbent resin by a corn cob one-pot method, can solve the problems of increased cost, high reaction temperature, increased consumption of organic solvents, etc., and achieves cost saving and simple synthesis process. , the effect of large market competitiveness

Inactive Publication Date: 2022-01-14
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 corn stalk resources, its reaction temperature is relatively high, and it is treated with ethanol, which will increase the consumption of organic solvents and inevitably increase the cost. Moreover, its function is to absorb heavy metal ions instead of preparing water-absorbent resins. Full use of corn cobs There are no patents or literature reports on the technology related to the preparation of superabsorbent resin, so our technology is innovative and practical

Method used

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  • Method for preparing plant potassium-containing super absorbent resin by corncob one-pot method
  • Method for preparing plant potassium-containing super absorbent resin by corncob one-pot method
  • Method for preparing plant potassium-containing super absorbent resin by corncob one-pot method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] First, add 5g of potassium hydroxide to 200mL of deionized water to form a potassium hydroxide solution with a mass concentration of 2.5%, cool it for use, then add the above potassium hydroxide solution into a 1000mL beaker, add 30g of it under stirring and grind it through 100 mesh Sieved corncob powder, soaked for 5h. In a water bath at 30°C, add 20mL of sodium hydroxide solution with a mass fraction of 20% dropwise under the condition of large stirring, and maintain the alkalinization reaction at 30°C for 90min; dissolve 10.71g of sodium chloroacetate in 35.7mL of deionized water, Prepare a sodium chloroacetate etherification agent solution with a mass fraction of 30%. When the temperature rises to 75°C, slowly add the above sodium chloroacetate etherification agent solution dropwise to the alkalized corncob fiber soaking solution under stirring conditions During the etherification reaction for 120 minutes; the above product was taken out, dried in an oven at 70°C, ...

Embodiment 2

[0076] First, add 6g of potassium hydroxide to 200mL of deionized water to form a potassium hydroxide solution with a mass concentration of 3%, cool it for use, then add the above-mentioned potassium hydroxide solution into a 1000mL beaker, add 30g of it before stirring and grind it through 100 mesh Sieved corn cob powder, soaked for 3.5h. In a water bath at 30°C, add 25mL of potassium hydroxide solution with a mass fraction of 20% dropwise under the condition of large stirring, and maintain the alkalinization reaction at 30°C for 90min; dissolve 11.75g ​​of sodium chloroacetate in 39mL of deionized water, and prepare Prepare a 30% sodium chloroacetate etherification agent solution, and when the temperature rises to 75°C, slowly add the above sodium chloroacetate etherification agent solution dropwise to the alkalized corncob fiber soaking solution under stirring conditions , etherification reaction for 105min; take out the above product, dry it in an oven at 70°C, take it out...

Embodiment 3

[0080] First, add 6g of potassium hydroxide to 200mL of deionized water to make a potassium hydroxide solution with a mass concentration of 3%, cool it for later use, then add the above potassium hydroxide solution into a 1000mL beaker, add 30g of it before stirring and grind it through 100 mesh Sieved corn cob powder, soaked for 3.5h. In a water bath at 30°C, add 25mL of potassium hydroxide solution with a mass fraction of 20% dropwise under the condition of large stirring, and maintain the alkalinization reaction at 30°C for 90min; dissolve 13.49g of sodium chloroacetate in 45mL of deionized water, and prepare Make a 30% sodium chloroacetate etherification agent solution, and when the temperature rises to 75°C, slowly add the above sodium chloroacetate etherification agent solution dropwise to the alkalized corncob fiber soaking solution under stirring conditions , etherification reaction for 105min; take out the above product, dry it in an oven at 70°C, take it out for 48h,...

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Abstract

The invention discloses a method for preparing potassium-containing super absorbent resin from corncobs by a one-pot process. The method comprises the following steps: S1, soaking crushed corncob powder in a low-concentration alkali solution, then adding a high-concentration alkali solution for alkalization reaction, and then adding sodium chloroacetate for etherification reaction to obtain corncob carboxymethyl cellulose; S2, mixing acrylic acid and a neutralizer for a neutralization reaction, and obtaining acrylic acid and a salt solution thereof ; S3, mixing the corncob carboxymethyl cellulose prepared in the step S1 with an oxidizing agent, a cross-linking agent, acrylic acid and a salt solution thereof, introducing nitrogen and stirring, and then adding a reducing agent to carry out polymerization reaction; and S4, after the polymerization reaction is finished, carrying out heating and heat preservation to obtain the product. The water absorption performance and the water retention performance of the super absorbent resin prepared by the method are more than two times of those of similar products in the current market, the potassium content is high, the preparation cost is low, 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 the superabsorbent resin used in the field of agriculture, industry and additive industry, in particular to a method for preparing plant potassium-containing superabsorbent resin by corncob one-pot method, and the corncob after threshing corn widely planted in agriculture As a raw material, carboxymethyl cellulose with a high degree of substitution is prepared after carboxymethylation modification, which is used as a matrix to graft polymerization with monomer acrylic acid and potassium acrylate to prepare a superabsorbent resin with a water absorption rate higher than 1000 times. At the same time, select The low-temperature redox initiator can significantly reduce the cost of raw materials and synthesis, and the prepared superabsorbent resin is not easy to implode. Due to the excellent performance of the product, it has broad application prospects in the above-mentioned fields. Background techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/02C08F220/06C08F222/38C08F4/40
CPCC08F251/02C08F4/40C08F220/06C08F222/385
Inventor 廉萌王鑫李春霞肖珍杜帅许晴晴刘洁刘宏元陈盛维尤作兴
Owner WEIFANG UNIV OF SCI & TECH
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