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Preparation method of porous-super-absorbent resin

A superabsorbent resin and porous technology, applied in the field of superabsorbent resin, can solve the problems of complex synthesis process, unfavorable industrial production, and increased production cost, and achieve the effects of simple process, shortened polymerization reaction time, and low production cost

Inactive Publication Date: 2013-07-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many ways to improve the performance of water-absorbent resin, such as designing the interpenetrating network structure of superabsorbent resin (Lim D W, Yoon K J, Ko S W.Synthesis of AA-based superabsorbent interpenetrated with sodium PVA sulfate[J].Journal of Applied Polymer Science.2000, 78(14):2525-2532) and selection of new crosslinking agents (Zhang J, Sun M, Zhang L, et al.Water absorbency of poly(sodium acrylate) superabsorbents crosslinked with modified poly(ethylene glycol )s[J].Journal of Applied Polymer Science.2003,90(7):1851-1856.), although the above methods can improve the performance of water-absorbent resins, but due to the introduction of substances (sodium polyvinyl alcohol sulfonate and polyethylene The synthetic technique of diol diacrylate) is extremely complicated, thereby production cost increases substantially, and this just makes these methods be unfavorable for suitability for suitability for industrialized production

Method used

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  • Preparation method of porous-super-absorbent resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) 100g of acrylic acid was added to 100g of deionized water, neutralized with 30wt% sodium hydroxide aqueous solution, and the neutralization temperature was controlled to be 80°C to obtain a mixed solution with a monomer concentration of 40% and a neutralization degree of 80%.

[0028] (2) Add 0.03g crosslinking agent N, N'-methylenebisacrylamide and stir until completely dissolved, then add 1g oxidant ammonium persulfate and 10g foaming agent sodium bicarbonate, and pour the mixture into the reactor , Then add 0.1g reducing agent sodium bisulfite to carry out polymerization reaction.

[0029] (3) The obtained porous gel is granulated by a meat grinder, then put into an oven, and dried for 18 hours at a temperature of 80°C to obtain gel particles, which are pulverized and sieved to obtain 60 ~100 mesh white powdery solid granular superabsorbent resin products. After testing, its performance test results are shown in Table 1.

Embodiment 2

[0031] (1) 100g of acrylic acid was added to 100g of deionized water, neutralized with 20wt% sodium hydroxide aqueous solution, and the neutralization temperature was controlled to be 80°C to obtain a mixed solution with a monomer concentration of 40% and a neutralization degree of 80%.

[0032] (2) Add 0.03g crosslinking agent N, N'-methylenebisacrylamide and stir until completely dissolved, then add 1g oxidant ammonium persulfate and 15g foaming agent potassium bicarbonate, and pour the mixture into the reactor , Then add 0.1g reducing agent sodium bisulfite to carry out polymerization reaction.

[0033] (3) The obtained porous gel is granulated by a meat grinder, then put into an oven, and dried for 18 hours at a temperature of 80°C to obtain gel particles, which are pulverized and sieved to obtain 60 ~100 mesh super absorbent resin products. The performance test results are shown in Table 1.

Embodiment 3

[0035] (1) 100g of acrylic acid was added to 100g of deionized water, neutralized with 40wt% sodium hydroxide aqueous solution, and the neutralization temperature was controlled to be 80°C to obtain a mixed solution with a monomer concentration of 40% and a neutralization degree of 80%.

[0036] (2) Add 0.5g of cross-linking agent polyvinyl alcohol and stir until completely dissolved, then add 0.5g of oxidant sodium persulfate and 20g of foaming agent sodium bicarbonate, pour the mixture into the reactor, and then add 0.1g of reducing agent Sodium bisulfite for polymerization.

[0037] (3) The obtained porous gel is granulated by a meat grinder, then put into an oven, and dried for 18 hours at a temperature of 80°C to obtain gel particles, which are pulverized and sieved to obtain 60 ~100 mesh super absorbent resin products. The performance test results are shown in Table 1.

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Abstract

The invention discloses a preparation method of porous-super-absorbent resin. The preparation method comprises the following steps of: adding acyclic acid to deionized water, neutralizing with a sodium hydroxide aqueous solution, and controlling neutralization temperature at 50 DEG C to 80 DEG C and neutralization degree at 60-80%; mixing the solution; adding a cross-linking agent and stirring till completely dissolving, then adding an oxidant and a foaming agent, afterwards, adding a reducing agent, carrying out polymerization reaction by heat of neutralization, and generating porous-super-absorbent resin gel; and pelleting, drying, crushing and screening to obtain the porous-super-absorbent resin. Additional heating equipment is not needed in the porous-super-absorbent resin preparation method; heat released in neutralization process is directly used for enabling a polymerization reaction system to reach the temperature needed by the reaction; and an oxidation reduction initiating agent is added at high temperature, so that the whole polymerization reaction time is shortened, and the production efficiency is improved; and the added foaming agent can be used for preparing porous gel, so that the water retaining capacity and the water-absorption capability of the water-absorbent resin are improved.

Description

technical field [0001] The invention relates to a superabsorbent resin, in particular to a preparation method of a porous superabsorbent resin. Background technique [0002] Superabsorbent resin is a functional polymer material containing strong hydrophilic groups and moderately cross-linked. It can absorb water hundreds or even thousands of times its own weight. Therefore, it is widely used in sanitary and medical materials, agricultural and horticultural, Soil modification, environmental protection and civil engineering and other industries. Among them, because the raw materials are abundant and easy to obtain, the preparation is simple, and the water absorption performance is good, the superabsorbent resin synthesized with acrylic acid and its salt as the main raw material is most used in industry. [0003] At present, the industrial production of superabsorbent resin generally adopts aqueous solution polymerization (such as patent documents CN102516443A, CN102633944A, U...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F222/38C08F120/06C08F4/40C08F2/44C08J9/08
Inventor 沈慧芳张小磊严小妹黄洪
Owner SOUTH CHINA UNIV OF TECH
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