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Method for grafting humic acid into high water absorption resin and high water absorption resin obtained by same

A technology of humic acid and humate, applied in the direction of chemical instruments and methods, applications, organic fertilizers, etc., can solve the problem of low humic acid grafting amount, and achieve the effect of high water absorption and high salt tolerance

Inactive Publication Date: 2010-12-15
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this invention is to propose a new method for grafting humic acid in water-absorbent resins, so as to overcome the defect of low grafting amount of humic acid in existing products

Method used

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  • Method for grafting humic acid into high water absorption resin and high water absorption resin obtained by same

Examples

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Embodiment 1

[0029] Add 15 parts by weight of acrylic acid into the beaker, and then add a certain amount of NaOH solution, so that the neutralization degree of acrylic acid and acrylate reaches 85%. After the reaction is completed, add 9 parts by weight of acrylamide solution, add 42 parts by weight of water, and stir to dissolve After uniformity, add 0.04% of the weight of the acrylic acid crosslinker N, N'-methylenebisacrylamide and 0.05% of the initiator K 2 S 2 o 8 , stirred at 80°C for 45 minutes, cooled to 25°C, added 7.2 parts by weight of NaClO and 7.8 parts by weight of NaOH (the ratio of the amount of substances was about 1:2), stirred at this temperature for 1 hour, and then heated to 70 Continue to polymerize at about ℃, control the degree of polymerization, so that 4.5 parts by weight of sodium humate can be mixed evenly by stirring smoothly. After adding sodium humate, continue to polymerize at a temperature of 70° C. until a jelly-like polymer is obtained. After the poly...

Embodiment 2

[0031] Add 15 parts by weight of acrylic acid into the beaker, and then add a certain amount of NaOH solution, so that the neutralization degree of acrylic acid and acrylate reaches 85%. After the reaction is completed, add 9 parts by weight of acrylamide solution, add 42 parts by weight of water, and stir to dissolve After uniformity, add 0.04% crosslinking agent N, N'-methylenebisacrylamide and 0.05% initiator K relative to the amount of acrylic acid 2 S 2 o 8 , stir well. Stir at 60°C for 2 hours, cool down to 25°C, add 9 parts by weight of NaClO and 9.7 parts by weight of NaOH (the ratio of the amount of substances is 1:2), stir for 1 hour, heat up to about 80°C to continue polymerization, and control polymerization To such an extent that 4.5 parts by weight of sodium humate can be smoothly mixed by stirring. After adding sodium humate, continue to polymerize at a temperature of 70° C. until a jelly-like polymer is obtained. After the polymer is cooled, take it out, cu...

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Abstract

The invention relates to a new method for grafting humic acid into high water absorption resin. Amide groups in the water absorption resin containing the amide groups are degraded into amino groups by Hofmann degradation so as to improve the grafting rate of the resin and the humic acid salt and improve the water absorption of the water absorption resin. The invention also relates to the high water absorption resin obtained by the method.

Description

technical field [0001] The invention relates to a preparation method of a superabsorbent resin, more particularly to a method for grafting humic acid into an acrylic acid-acrylamide superabsorbent resin to increase water absorption. Background technique [0002] Super Absorbent Polymer (SAP), also known as super absorbent resin, water retaining agent, and water-absorbent gel, is a polymer containing strong hydrophilic groups such as hydroxyl and carboxyl, and has a certain cross-linked network structure. things. It can quickly absorb dozens, hundreds or even thousands of times its own weight of deionized water through hydration, and can also absorb dozens to hundreds of times of normal saline, urine, blood and other liquids. Unique properties, but also has a strong ability to retain moisture. [0003] Water-absorbent resins are also used as water-retaining agents for crops and forest trees. However, in arid and less rainy areas, the water-retaining agent is not enough jus...

Claims

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Application Information

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IPC IPC(8): C08G81/02C08F220/06C08F8/04C09K17/32
Inventor 刘红缨杨玉立王彩红朱书全赵银荣
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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