衣康酸酯类聚羧酸系减水剂的制备及表征
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摘要
以衣康酸聚乙二醇酯大分子单体(IAPEG)、丙烯酸(AA)、马来酸酐(MA)和甲基丙烯磺酸钠(MAS)为原料,过硫酸铵为引发剂,经水溶液聚合制备了一种聚羧酸系减水剂(PC)。通过红外光谱对共聚物的结构进行了表征,采用凝胶渗透色谱仪对共聚物的相对分子质量及其分布进行了测定,讨论了聚合条件对减水剂性能的影响,得到最佳反应条件为:n(IAPEG)∶n(MA)∶n(AA)∶n(MAS)=1.5∶4.0∶6.0∶3.0,引发剂用量为单体总质量的10%,反应温度80℃,反应时间5 h。在该条件下合成的减水剂可以降低溶液的表面张力,促进水泥颗粒的分散,使水泥浆体具有较好的流动度。添加减水剂混凝土的减水率为39.2%,7 d抗压强度比(添加减水剂混凝土抗压强度/基准混凝土抗压强度)为191.4%,28 d抗压强度比为154.7%。
A polycarboxylate type superplasticizer(PC) was synthesized by water solution polymerization of itaconic acid polyethylene glycol ester(IAPEG), acrylic acid(AA), maleic anhydride(MA) and sodium methylacryl sulfonate(MAS) using ammonium persulfate as initiator. The copolymer was characterized by FTIR. Its molecular weight and molecular weight distribution were characterized by GPC. The influences of reaction conditions on the properties of the polycarboxylate type superplasticizer were discussed. The results showed that the optimal reaction conditions were as follows: n(IAPEG)∶n(MA)∶n(AA)∶n(MAS)=1.5∶4.0∶6.0∶3.0, initiator dosage being 10% of the mass of all monomers, reaction temperature80 ℃, reaction time 5 h. Under the optimum conditions, adding the synthesized polycarboxylate type superplasticizer could reduce the surface tension of the solution, promote the dispersion of cement particles and make the fluidity of cement paste better. The water reducing ratio of PC in concrete was 39.2%. The compressive strength ratio(the compressive strength of concrete with water reducing agent/compressive strength of reference concrete) of the concrete could reach 191.4% at 7 d and 154.7% at 28 d, respectively.
A polycarboxylate type superplasticizer(PC) was synthesized by water solution polymerization of itaconic acid polyethylene glycol ester(IAPEG), acrylic acid(AA), maleic anhydride(MA) and sodium methylacryl sulfonate(MAS) using ammonium persulfate as initiator. The copolymer was characterized by FTIR. Its molecular weight and molecular weight distribution were characterized by GPC. The influences of reaction conditions on the properties of the polycarboxylate type superplasticizer were discussed. The results showed that the optimal reaction conditions were as follows: n(IAPEG)∶n(MA)∶n(AA)∶n(MAS)=1.5∶4.0∶6.0∶3.0, initiator dosage being 10% of the mass of all monomers, reaction temperature80 ℃, reaction time 5 h. Under the optimum conditions, adding the synthesized polycarboxylate type superplasticizer could reduce the surface tension of the solution, promote the dispersion of cement particles and make the fluidity of cement paste better. The water reducing ratio of PC in concrete was 39.2%. The compressive strength ratio(the compressive strength of concrete with water reducing agent/compressive strength of reference concrete) of the concrete could reach 191.4% at 7 d and 154.7% at 28 d, respectively.
引文
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[11]Zhang Jianfeng(张建锋),Wang Jiafeng(王家丰),Song Yongliang(宋永良),et al.A multi-branched chain polycarboxylate type superplasticizer with excellent slump retention performance and a preparation method thereof:CN201010185714.6[P].2010-10-06.
[12]Su Yu(苏瑜),Pang Hao(庞浩),Wang Bin(王斌),et al.A new polycarboxylate type superplasticizers-Preparation and characterization of macromonomer[J].Fine Chemicals(精细化工),2012,29(2):187-191.
[13]Yamada,Takahashi,Hanehara,et al.Effect of the chemical structure on the properties of polycarboxylate-type superplasticizer[J].Cement and Concrete Research,2000,30:197-207.
[14]Plank J,Winter Ch.Competitive adsorption between superplasticizer and retarder molecules on mineral binder surface[J].Cement and Concrete Research,2008,38:599-605.
[15]Jiang Yu(姜玉),Pang Hao(庞浩),Liao Bing(廖兵).Study of polycarboxylate-type superplasticizer with poly(ethylene oxide)graft chains[J].Chemical Industry and Engineering Progress(化工进展),2008,27(5):733-735.
[2]Yan Handong(严捍东),Zhong Guocai(钟国才).Research status and development direction of polycarboxylate superplasticizer[J].Journal of Guizhou University(Natural Sciences)(贵州大学学报:自然科学版),2017,34(1):23-28.
[3]Uchikawa,Hanehara,Sawaki.The role of steric repulsive force in the dispersion of cement particles in fresh paste prepared with organic admixture[J].Cement and Concrete Research,1997,27(1):37-50.
[4]Yuan Jingzhe(袁靖喆),Du Zhiguang(杜治光),Pan Lisha(潘莉莎),et al.Present study on structural effects of properties of high efficiency polycarboxylate superplasticizer[J].Concrete(混凝土),2014,12:105-110.
[5]Li Chongzhi(李崇智),Feng Naiqian(冯乃谦),Niu Quanlin(牛全林).Model for molecular structure of polycarboxylic scid type water-reducer and its high performance designing[J].Journal of Building Materials(建筑材料学报),2004,7(2):194-201.
[6]He Yan(何燕),Zhang Xiong(张雄),Zhang Yongjuan(张永娟),et al.Adsorption and dispersing capability of polycarboxylate superplasticizers with various functional groups[J].Journal of Tongji University(Natural Science)(同济大学学报:自然科学版),2017,45(2):244-248.
[7]Wang X,Ran Q,Shu X.Impact of molecular weight of block polycarboxylate superplasticisers on the dispersion of cement paste[J].Advances in Cement Research,2016,28(6):1-7.
[8]Yang Chunhui(杨春晖),Li Piwu(李丕武).The pressure of development and research on the application of itaconic acid[J].Shandong Food Fermentation(山东食品发酵),2009,153(2):18-20.
[9]He Minchao(何敏超),Zhang Yu(张宇),Xu Jingliang(许敬亮),et al.Current situation and future development of itaconic acid production[J].China Brewing(中国酿造),2012.31(11):8-11.
[10]Plank J,P?llmann K,Zouaoui N,et al.Synthesis and performance of methacrylic ester based polycarboxylate superplasticizers possessing hydroxy terminated poly(ethylene glycol)side chains[J].Cement and Concrete Research,2008,38:1210-1216.
[11]Zhang Jianfeng(张建锋),Wang Jiafeng(王家丰),Song Yongliang(宋永良),et al.A multi-branched chain polycarboxylate type superplasticizer with excellent slump retention performance and a preparation method thereof:CN201010185714.6[P].2010-10-06.
[12]Su Yu(苏瑜),Pang Hao(庞浩),Wang Bin(王斌),et al.A new polycarboxylate type superplasticizers-Preparation and characterization of macromonomer[J].Fine Chemicals(精细化工),2012,29(2):187-191.
[13]Yamada,Takahashi,Hanehara,et al.Effect of the chemical structure on the properties of polycarboxylate-type superplasticizer[J].Cement and Concrete Research,2000,30:197-207.
[14]Plank J,Winter Ch.Competitive adsorption between superplasticizer and retarder molecules on mineral binder surface[J].Cement and Concrete Research,2008,38:599-605.
[15]Jiang Yu(姜玉),Pang Hao(庞浩),Liao Bing(廖兵).Study of polycarboxylate-type superplasticizer with poly(ethylene oxide)graft chains[J].Chemical Industry and Engineering Progress(化工进展),2008,27(5):733-735.