發(fā)布時間：2018-03-14 10:44

  本文選題：聚羧酸減水劑　切入點：改性合成　出處：《西南科技大學》2017年碩士論文　論文類型：學位論文

【摘要】：本文在二元聚羧酸減水劑合成的基礎上,分別采用2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、馬來酸單甲酯(MMM)進行進一步地改性合成,探討改性官能團對減水劑性能的影響。同時針對快流砂漿體系倆個主要性能,流動性與抗離析性,通過凈漿流動度、砂漿減水率、Marsh筒流空時間以及漿體流變-觸變性等一系列測試,定量地對比研究了不同減水劑的流動性及保水性,最終得到一種在快流砂漿體系中適應性較好的聚羧酸減水劑。首先選用氧化-還原引發(fā)體系,丙烯酸(AA)和異戊烯醇聚氧乙烯醚(TPEG)為原料,通過單因素試驗優(yōu)化基礎型聚羧酸減水劑(P1)制備條件。并在此條件下分別加入第三改性單體AMPS、MMM進行正交合成,制備三元型聚羧酸減水劑,并通過紅外及高效液相色譜進行表征分析了合成產(chǎn)物結構及反應率:(1)P1(二元基礎型聚羧酸減水劑)最佳合成條件:n(AA):n(TPEG)=4、n(TBHP):n(吊白塊)=3、吊白塊(還原劑)、TGA(鏈轉移劑)分別占單體總質量的0.3%、0.5%,反應溫度25℃。(2)P2(AMPS型聚羧酸減水劑)最佳合成條件:n(AA):n(TPEG)=4、n(TBHP):n(吊白塊)=3、n(AMPS):n(TPEG)=1:2,吊白塊(還原劑)、TGA(鏈轉移劑)分別占單體總質量的0.3%、0.5%,反應溫度25℃。通過紅外及高效液相色譜進行表征分析知P2的反應率達到98%。(3)P3(MMM型聚羧酸減水劑)最佳合成條件:n(AA):n(TPEG)=4、n(TBHP):n(吊白塊)=3、n(MMM):n(TPEG)=2:1,吊白塊(還原劑)、TGA(鏈轉移劑)分別占單體總質量的0.3%、0.7%,反應溫度25℃。通過紅外及高效液相色譜進行表征分析知P3的反應率達到96%。接下來將上述合成的三種減水劑(P1、P2、P3)與市售的三三減水劑P4、柯帥減水劑P5進行了性能對比。通過流動度、保水性及Marsh筒流空時間三種測試手段相結合,引入流動性指數(shù)α*,用公式定量評價了砂漿體系與不同聚羧酸減水劑的流動性問題,其先后順序為:P2P4P5P3P1。最后對比了不同水灰比下減水劑對砂漿流變-觸變性的影響,得到摻不同聚羧酸減水劑的漿體平均觸變面積關系為:P2P4P1P5P3。摻P2減水劑砂漿觸變面積最大,這可能是由于P2的加入后,上升階段漿體絮凝結構較多,阻力較大,在相同轉速時轉矩較大。下降階段,部分絮凝結構被破壞,漿體中存在自由顆粒,阻力較小。下降階段達到與上升階段相同的轉矩所需要的轉速更大,從而漿體觸變性最大而分散性最好。最終綜合上述一系列測試的結果知AMPS型聚羧酸減水劑P2是這五種減水劑中適于快流砂漿體系最優(yōu)的。
[Abstract]:In this paper, based on the synthesis of binary polycarboxylic acid superplasticizer, 2-acrylamido-2-methylpropanesulfonic acid (AMPSX) and monomethyl maleate (MMM) were further modified and synthesized. The effect of modified functional groups on the properties of superplasticizer was discussed. A series of tests, such as water reducing rate of mortar and Marsh cylinder flow empty time and rheology and thixotropy of mortar, were used to study quantitatively the fluidity and water retention of different water reducers. Finally, a polycarboxylic acid water reducer with good adaptability in the rapid flow mortar system was obtained. Firstly, the redox initiator system, acrylic acid (AA) and isopentenol polyoxyethylene ether (TPEG) were used as raw materials. The preparation conditions of basic polycarboxylic acid superplasticizer (P1) were optimized by single factor experiment. The ternary polycarboxylic acid superplasticizer was prepared by orthogonal synthesis with the addition of the third modified monomer AMPS- MMM under these conditions. The structure and reaction rate of the synthesized product were characterized by IR and high performance liquid chromatography (HPLC). The optimum conditions for the synthesis of the synthesized product were as follows: 1: 1: 1 (binary basic polycarboxylic acid superplasticizer). The optimum conditions for the synthesis of the product were as follows: (1: 1). The optimum conditions for the synthesis of the product were as follows: (1) the ratio of TBHP1 to TBHP1 (TBHP0. 3) and the proportion of TGA (chain transfer agent) to 1% (TGA), respectively. The optimum conditions for synthesis of 0.33% of total body mass, reaction temperature 25 鈩，

本文編號：1610861