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1、2014年第2期(總第292期)混凝土原材料及輔助物料Number2in2014(TotalNo.292)ConcreteMATERIALANDADMINICLEdoi:10.3969/j.issn.1002-3550.2014.02.017酰胺型聚羧酸系減水劑的合成研究1,211,21,21馮中軍,孔凡桃,鄧最亮,傅樂峰,俞明輝(1.上海三瑞高分子材料有限公司,上海200237;2.上海建筑外加劑工程技術研究中心,上海200237)摘要:制備了一種酰胺型聚羧酸系減水劑,研究了主鏈分子量、主鏈組成以及側鏈接枝密度對其減水保坍性能的影響,通過FTIR、GPC對其結構進行了表征
2、,最后與聚羧酸醚(AA/HPEG共聚物)、聚羧酸酯(MAA/MPEGMA共聚物)等兩類聚羧酸系減水劑進行了性能對比。結果表明:主鏈分子量約4000、主鏈組成是摩爾比AA/MAA=3∶1的共聚物、側鏈接枝密度為20%的酰胺型聚羧酸系減水劑綜合性能最好,其混凝土減水率、坍落度保持和抗壓強度等性能均優(yōu)于聚羧酸醚和聚羧酸酯兩類減水劑。關鍵詞:酰胺型;聚羧酸;減水劑;高減水率;坍落度保持;外加劑中圖分類號:TU528.042.2文獻標志碼:A文章編號:1002-3550(2014)02-0064-04Studyonthepreparationofamidetypepolycarbox
3、ylatesuperplasticizerFENGZhongjun1,2,KONGFantao1,2,DENGZuiliang1,2,F(xiàn)ULefeng1,2,YUMinghui1(1.ShanghaiSunrisePolymerMaterialCompanyLimited,Shanghai200237,China;2.ShanghaiEngineeringResearchCenterofBuildingAdmixture,Shanghai200237,China)Abstract:Anamidetypepolycarboxylatesuperplasticizerwassy
4、nthesized.Theeffectofmain-chainmoleculeweight,thecomponentsofbackboneandthegraftingdensityofsidechainontheabilityofwaterreductionandslumplossresistantpropertywereinvestigated.Thestructureofamidetypepolycarboxylatesuperplasticizerwascharacterizedbyfouriertransforminfraredspectroscopy(FTIR)a
5、ndgelper-meationchromatography(GPC).Finally,thecomparisonwasmadeontheperformanceofthesyntheticamidetypepolycarboxylatesu-perplasticizer,polyethertypepolycarboxylatesuperplasticizer(AA/HPEGcopolymer)andpolyestetypepolycarboxylatesuperplasticizer(MAA/MPEGMAcopolymer).Theresultshowedthatthesy
6、ntheticamidetypepolycarboxylatesuperplasticizerhadthebestcomprehen-siveperformancewhenthemain-chainmoleculeweightwasabout4000,themolarratioofacrylicacid(AA)tomethacrylicacid(MAA)ofbackbonewas3∶1andthegraftedsidechaindensitywas20%.Meanwhile,thisamidetypepolycarboxylatesuperplasticizerhadabe
7、tterper-formanceonwater-reducingrate,slump-retainingabilityandcompressivestrengthforconcretecomparewiththepolyethertypeandpolyestertypepolycarboxylatewaterreducer.Keywords:amidetype;polycarboxylicacid;waterreducer;highwater-reducingrate;slump-retaining;admixtu