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《馬來酸雙聚乙二醇單甲醚酯大單體的合成及其在聚羧酸減水劑制備中的應(yīng)用.pdf》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫(kù)。
1、Cementgrindingaidandconcreteadmixture技術(shù)探討I馬來酸雙聚乙二醇單甲醚酯大單體的合成及其在聚羧酸減水劑制備中的應(yīng)用曾小君1,2,陳燕紅1,申靜靜1,王航航1(1.常熟理工學(xué)院化學(xué)與材料工程學(xué)院江蘇常熟215500;2。常熟理工學(xué)院江蘇省新型功能材料重點(diǎn)建設(shè)實(shí)驗(yàn)室江蘇常熟215500)文章編號(hào):2218—9882(2015)02—041—04摘要:在無溶劑存在下,以對(duì)甲苯磺酸為催化劑,4A分子篩作脫水劑,以馬來酸酐(MAH)和聚乙二醇單甲醚(MPEG)為原料合成了馬來酸雙聚乙二醇單甲醚酯(DMP
2、EGMA)??疾炝藛误w摩爾比、催化劑用量、反應(yīng)溫度及反應(yīng)時(shí)間等條件對(duì)酯化率的影響。試驗(yàn)結(jié)果表明,當(dāng)n(MPEG):n(MAH)=2.1:1.0,催化劑用量為聚乙二醇單甲醚和馬來酸酐總質(zhì)量的5%,反應(yīng)溫度為130℃,反應(yīng)時(shí)間為8h時(shí),酯化率可達(dá)到97.2%。以這種大單體合成的聚羧酸系減水劑具有良好的分散性和保塑性,當(dāng)其摻量為0.3%,水灰比為0.29時(shí),水泥凈漿初始流動(dòng)度達(dá)300mm。關(guān)鍵詞:聚羧酸減水劑;馬來酸雙聚乙二醇單甲醚酯;無溶劑;酯化SynthesisofDmpegmaMacrom0nomeranditsAppIicat
3、iontoPreparingPoIycarboxylateSbulperP。Iast。ic。izerZengXiaojunl,2,ChenYanhongI,ShenJingjingl,WangHanghangl(1.SchoolofChemistryandMateria1Engineering,ChangshuInstituteofTechnology,Changshu215500,Jiangsu,China;2.JiangsuLaboratoryofAdvancedFunctionalMateria1s,ChangshuIns
4、tituteofTechnology,Changshu215500,Jiangsu,China)Abstract:Ma1eicaciddipolyethy1eneg1yco1monomethy1etheracetate(DMPEGMA)wassynthesizedbydirectesterificationwithoutsolventwithmaleicanhydride(MAH)andpolyethyleneglycoIsinglemethylether(MPEG)asrawmateria1sinthepresenceofp-
5、toluenesulfenicacidascata1ystand4Amelecularsieveasdehydrator.Theinf1uenceofmo1arratioofmonomer,aMountofcata1yst,reactiontemperatiJreandreactiontimeonesterificationratewereinvestigated.Theresu1tsshowedthattheoptimumreactionconditionisasf0llOWS:theme1arratioofMPEGtoMAH
6、is2.1:1.0,massfractionofcatalystis5%tothetotalMAHandMPEG.reactiontemperatureis130℃andthereactiontimeis8h.Underthiscondition,theesterificationratecouldreach97.2%.Thepolycarboxy1atesuperp1asticizerpreparedunderthisconditionwellldhavegoodplasticizingandfluidity.Thefluid
7、ityofcementpastecanreach300mmwith0.3%percentagemasscontentofthepolycarboxylatesuperplasticizerandwater—cementratio(w/c)of0.29.Keywords:po1yearboxy1atesuperpiasticizer:maIeicaciddipo1yethyleneg1yco1monomethyletheracetate;SO1vent-free;esterification.——41—-水泥助磨劑與混凝土外加劑現(xiàn)
8、代建筑工程的快速發(fā)展對(duì)混凝士減水劑的要求1.1實(shí)驗(yàn)原材料及儀器越來越高,聚羧酸系高效減水劑因具有減水率大、保聚乙二醇單甲醚(MPEG-1200),工業(yè)級(jí);馬來坍性能好、安全環(huán)保等優(yōu)點(diǎn),已經(jīng)成為減水劑發(fā)展酸酐(MAH)、甲基丙烯酸(MAA),分析純;塒苯的主要方向