화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.35, No.4, 363-369, July, 2011
Export Citation
시멘트 수용액에서 흡수 지연을 위한 Crosslinked Poly(sodium acrylate)의 표면 가교
Synthesis of Surface Crosslinked Poly(sodium acrylate) for Delayed Absorption in Cement Solution
황기섭, 장석수1, 정용욱1, 이승한1, 하기룡†
  • 계명대학교 화학공학과
  • 1계명대학교 토목공학과
KiSeob Hwang, SeokSoo Jang1, YongWook Jung1, SeungHan Lee1, and KiRyong Ha†
  • Department of Chemical Engineering, Keimyung University, Dalseo, Deagu 704-701, Korea
  • 1Department of Civil Engineering, Keimyung University, Dalseo, Deagu 704-701, Korea
E-mail:
초록
콘크리트 제조 시 사용되는 잉여수를 지연 흡수시키기 위하여 역유화중합법으로 중합된 가교 poly(sodium acrylate)(cPSA)를 ethylene glycol dimethacrylate(EGDMA)로 표면 가교시켰다. cPSA의 제조에서 연속상은 paraffin liquid, 단량체는 8 M 농도의 NaOH 수용액으로 90% 중화된 acrylic acid(AA), 가교제는 N,N-methylene bisacrylamide(MBA), redox 개시제는 ammonium persulfate(APS)와 sodium metabisulfite(SMBS)를 사용하여 역유화중합법으로 제조하였다. 제조된 cPSA는 EGDMA를 사용하여 표면 가교 반응을 수행하였다. 시멘트 수용액에서 Ca2+ 이온과 cPSA의 상호 작용을 관찰하기 위하여 FTIR spectroscopy 분석법을 사용하였다. 제조된 흡수제들을 탈이온수, Ca(OH)2 수용액(pH 12) 및 시멘트 포화 수용액에서의 팽윤비를 측정하였으며, cPSA는 2시간만에 팽윤이 완료되었지만, 표면이 가교된 cPSA-EGDMA는 3시간 후 팽윤이 거의 완료되는 것을 관찰하였다. 또한 합성한 cPSA-EGDMA를 첨가함으로써 시멘트의 응결시간과 모르타르의 압축강도 증가를 관찰하였다.
To study the effect of incorporation of a surface crosslinking layer on a crosslinked poly(sodium acrylate)(cPSA) absorbent with ethylene glycol dimethacrylate (EGDMA), we synthesized several surface crosslinked cPSAs with EGDMA by an inverse emulsion polymerization method to delay the absorption of excess water in concrete. Liquid paraffin was used as a continuous phase. cPSA was synthesized with acrylic acid (AA) neutralized with aqueous 8 M sodium hydroxide solution as a monomer, N,N-methylene bisacrylamide (MBA) as crosslinking agent and ammonium persulfate (APS) and sodium metabisulfite (SMBS) as a redox initiator system by inverse emulsion polymerization. FTIR spectroscopy was used to characterize Ca2+ion interaction with cPSA and cPSA-EGDMAs. The swelling ratios of synthesized absorbents were evaluated from the absorption in deionized water, cement saturated aqueous solution and aqueous solution of calcium hydroxide (pH 12). Equilibrium swelling times for cPSA and surface crosslinked cPSA with EGDMA were 2 and 3 hrs, respectively. We also observed an increase in setting time of the cement and an increase in the compressive strength of mortar by addition of the synthesized cPSA-EGDMA.
Keywords:absorbent;delayed absorption;redox initiator;inverse emulsion polymerization;swelling ratio.
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