Preparation and Swelling Properties of Coal Fly Ash Composited Sodium Polyacrylate Hydrogel

doi:10.11944/j.issn.1000-0518.2016.04.150196

Chinese Journal of Applied Chemistry ›› 2016, Vol. 33 ›› Issue (4): 419-429.DOI: 10.11944/j.issn.1000-0518.2016.04.150196

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Preparation and Swelling Properties of Coal Fly Ash Composited Sodium Polyacrylate Hydrogel

ZHANG Junqi,JIN Shuping(),HAN Yuqi,YU Xinghai,YUE Guoren

Key Laboratory of Hexi Corridor Resources Utilization of Gansu,College of Chemistry and Chemical Engineering,Hexi University,Zhangye,Gansu 734000,China

Received:2015-06-11 Accepted:2015-12-01 Published:2016-04-01 Online:2016-04-01
Contact: JIN Shuping
Supported by:
Supported by the National Natural Science Foundation of China(No.51263008), the Key(Key grant) Project of Chinese Ministry of Education(No.212181)

Abstract

Abstract:

Coal fly ash composited sodium polyacrylate superabsorbent polymer hydrogel(CFAPAANa) was prepared by free radical solution polymerization of acrylic acid(AA) using potassium persulfate(KPS) as an initiator and N,N'-methylene-bis-acrylamide(NNMBA) as a crosslinker in the presence of coal fly ash(CFA). The CFAPAANa gel has the highest equilibrium swelling degree of 1556 g/g and 168 g/g in distilled water and physiological saline, respectively, when the mass ratio of cross linker to AA is 0.08%, initiator to AA is 0.4%, fly ash to AA is 3%, the neutralization degree of acrylic acid is 70% and polymerization temperature is 70 ℃. The swelling kinetics of gel in different media solution, the water retention properties and degradation behavior in soil were also studied, respectively. Results of the swelling kinetics show that the water absorbent capacity and rate are limited by the expanding polymer segment in distilled water, but the translation and convective diffusion of water play an important role during the swelling process in saline. The results obtained from tests of water retention and degradation show that water retention ratio of hydrogel is 65% after 50 h at 25 ℃, and the degradation percent is about 60% after 50 days in soil. Water retention ratio increases by 8% compared with that of PAANa hydrogel.

Key words: fly ash, poly(acrylic acid), salt resistance, water retention, degradation

ZHANG Junqi, JIN Shuping, HAN Yuqi, YU Xinghai, YUE Guoren. Preparation and Swelling Properties of Coal Fly Ash Composited Sodium Polyacrylate Hydrogel[J]. Chinese Journal of Applied Chemistry, 2016, 33(4): 419-429.

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Preparation and Swelling Properties of Coal Fly Ash Composited Sodium Polyacrylate Hydrogel

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