Preparation method for polyacrylic acid water-absorbent resin

A technology of water-absorbing resin and polypropylene, which is applied in the field of changing the pore structure and water-absorbing capacity of polyacrylic acid-based water-absorbing resins. It can solve the problems of waste of resources and incomplete development and utilization of aromatic ring polymers, and achieve the effect of improving water-absorbing capacity.

Active Publication Date: 2017-05-31
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As a natural aromatic polymer, lignin is rich in natural resources and is often burned as waste to be used as energy in the pulping process. Its characteristics as an aromatic ring polymer with a high three-dimensional three-dimensional structure have not been fully developed. and use, resulting in a waste of resources
In recent years, the application research of lignin has been increasing, but there are few reports on the research that can change the structure of lignin according to the application requirements

Method used

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  • Preparation method for polyacrylic acid water-absorbent resin
  • Preparation method for polyacrylic acid water-absorbent resin
  • Preparation method for polyacrylic acid water-absorbent resin

Examples

Experimental program
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Embodiment 1

[0031] Embodiment 1: preparation process of sodium polyacrylate resin

[0032] Accurately weigh 18.75g of acrylic acid in a 100mL beaker, slowly titrate acrylic acid with a 15.25w% aqueous solution prepared by dissolving 6.66g NaOH in 37mL deionized water under an ice-water bath to prepare a 65% sodium acrylate aqueous solution with a neutralization degree of 20mL The sodium acrylate solution configured above was stirred evenly and then transferred to a four-necked flask equipped with a nitrogen interface, a mechanical stirrer, a reflux condenser, and a thermometer, and reacted at 60°C under the protection of a nitrogen environment. After reaching the reaction temperature, add 0.0800g over Potassium sulfate, 0.0060 g of N'N-methylenebisacrylamide was added after 30 minutes, during which time the sodium acrylate solution was added dropwise. After reacting for 60 minutes, the reaction solution had a certain viscosity, poured it into a 200mL beaker filled with 100mL of ethanol, s...

Embodiment 2

[0033] Embodiment 2: the resin preparation process of alkali lignin grafting sodium polyacrylate

[0034]Accurately weigh 18.75g of acrylic acid in a 100mL beaker, slowly titrate acrylic acid with a 15.25w% aqueous solution prepared by dissolving 6.66g NaOH in 37mL deionized water under an ice-water bath to prepare a 65% sodium acrylate aqueous solution with a neutralization degree of 0.50 The alkali lignin in kraft pulping black liquor and 20mL of the above-mentioned sodium acrylate solution were stirred evenly, and then transferred to a four-necked flask equipped with a nitrogen interface, a mechanical stirrer, a reflux condenser, and a thermometer. React at 60°C under protection, add 0.0800g potassium persulfate after reaching the reaction temperature, and add 0.0060g N'N-methylenebisacrylamide after 30 minutes, during which time the sodium acrylate solution is added dropwise. After a total reaction time of 60 minutes, the reaction solution has a certain viscosity, pour it ...

Embodiment 3

[0035] Embodiment 3: Process of preparing resin by grafting lignin p-cresol with sodium polyacrylate

[0036] Accurately weigh 18.75g of acrylic acid in a 100mL beaker, slowly titrate acrylic acid with a 15.25w% aqueous solution prepared by dissolving 6.66g NaOH in 37mL deionized water under an ice-water bath to prepare a 65% sodium acrylate aqueous solution with a neutralization degree of 0.50 g of lignin p-cresol and 20mL of the sodium acrylate solution configured above were stirred evenly, then transferred to a four-necked flask equipped with a nitrogen port, a mechanical stirrer, a reflux condenser, and a thermometer, and reacted at 60°C under nitrogen protection. After reaching the reaction temperature, 0.0800g potassium persulfate was added, and 0.0060g N'N-methylenebisacrylamide was added after 15 minutes, during which the remaining sodium acrylate solution was added dropwise. After a total reaction time of 30 minutes, the reaction solution has a certain viscosity, pour...

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Abstract

The invention discloses a preparation method for polyacrylic acid water-absorbent resin, which comprises the following steps: (1) under the condition of ice-water bath, dripping a NaOH aqueous solution into acrylic acid to prepare a sodium acrylate aqueous solution of which the neutralization degree is 50-70%; (2) taking part of the sodium acrylate aqueous solution acquired in step (1), adding xylogen therein, heating the mixture to 50-70 DEG C in nitrogen atmosphere under the condition of stirring, adding potassium peroxodisulfate, when refluxing reaction time is half of the total time, adding N'N-methylene bisacrylamide and the remaining sodium acrylate aqueous solution, and continuing refluxing reaction in the rest of time, whereinthe total time of the refluxing reaction is 20-80min; (3) pouring a reactant acquired in step (2) into ethyl alcohol, dipping, taking out solid resin, and using ethyl alcohol to wash the solid resin until eluate is colorless; and (4) drying and smashing the washed resin, extracting resin powder with acetone to remove the homopolymer in the resin, refluxing for 18-24h, and then carrying out vacuum drying to obtain the polyacrylic acid water-absorbent resin.

Description

technical field [0001] The invention relates to a preparation method of polyacrylic acid water-absorbing resin, in particular to a method for changing the pore structure and water-absorbing capacity of polyacrylic acid water-absorbing resin by adding lignin. Background technique [0002] In recent years, the environment has deteriorated in a large area of ​​my country, and water resources are scarce. As a class of functional polymers, water-absorbent resins play an important role in various fields such as medicine and health, agriculture, forestry and horticulture, and desert control. With the improvement of human environmental awareness, the renewable and degradable properties of biomass resources have been paid attention to. Therefore, using biomass resources as raw materials to design and synthesize environmentally friendly water-absorbing resins has become a new research direction. [1] . [0003] As a natural aromatic polymer, lignin is rich in natural resources and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F289/00C08F220/06C08F222/38
CPCC08F289/00C08F220/06C08F222/385
Inventor 任浩钱爽张放童国林
Owner NANJING FORESTRY UNIV
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