本文選題：聚乙二醇 + 精氨酸　； 參考：《江蘇科技大學(xué)》2015年碩士論文

【摘要】：減水劑和阻銹劑是建筑工程中最常用的水泥混凝土添加劑。聚羧酸系減水劑是近幾年研究發(fā)展比較快的新型高效減水劑,能夠有效提高混凝土強(qiáng)度、改善性能、節(jié)約水泥用量及節(jié)省能耗等方面;氨基酸具有可生物降解性、綠色環(huán)保、價(jià)格低廉、種類繁多、來源廣泛等優(yōu)點(diǎn),是一種很有前途的綠色阻銹劑。本論文以對(duì)甲苯磺酸法使精氨酸羧基游離出來,繼而與過量聚乙二醇發(fā)生酯化反應(yīng),成功地合成了精氨酸對(duì)甲苯磺酸鹽(AT)封端的聚乙二醇單酯(AP)。分別以聚乙二醇(400、1000、1500)和AT為原料制得單酯AP(I、Ⅱ、Ⅲ),以此類單酯作為醇與甲基丙烯酸(MAA)進(jìn)行酯化反應(yīng)合成了大單體APM(I、Ⅱ、Ⅲ),大單體經(jīng)聚合反應(yīng)合成功能型聚羧酸減水劑APC(I、Ⅱ、Ⅲ),測(cè)試結(jié)果表明APC(Ⅱ)在水泥混凝土性能和阻銹緩蝕性能方面效果較為突出,比較適用于工業(yè)生產(chǎn)。合成APC(Ⅱ)的反應(yīng)分為三個(gè)階段:PEG1000與AT的摩爾比為1.3:1,催化劑對(duì)甲苯磺酸用量2%(按PEG1000和AT總質(zhì)量計(jì)),115℃反應(yīng)9h合成的AP(Ⅱ)酯化率達(dá)到95%左右;AP(Ⅱ)與MAA的摩爾比為1:3,阻聚劑對(duì)苯二酚用量為1%(按MAA質(zhì)量計(jì)),催化劑對(duì)甲苯磺酸用量2%(按AP(Ⅱ)與MAA總質(zhì)量計(jì)),100℃下反應(yīng)6 h合成的APM(Ⅱ)酯化率達(dá)到95%;單體聚合反應(yīng)中引發(fā)劑用量10%,APM(Ⅱ):MAA:SMAS的摩爾比為1:4.0:1.25,90℃下反應(yīng)1.5h合成APC(Ⅱ),性能測(cè)試表明APC(Ⅱ)凈漿流動(dòng)度為317mm,減水率達(dá)到30%,28天抗壓強(qiáng)度達(dá)到50.6MPa。同時(shí),作為APC對(duì)照試驗(yàn),本論文以自制聚羧酸減水劑大單體(PM)合成聚羧酸減水劑(PC),合成工藝流程和參數(shù)參照APC。PEG1000:MAA摩爾比為1:3.0,催化劑用量為2%(按PEG1000和MAA總質(zhì)量計(jì)),阻聚劑對(duì)苯二酚用量為1%(按MAA質(zhì)量計(jì)),95℃下反應(yīng)3.5 h,合成的PM(Ⅱ)酯化率高達(dá)97%;以此單酯合成聚羧酸減水劑PC(Ⅱ):引發(fā)劑用量10%(按單體總質(zhì)量計(jì)),PM(Ⅱ):MAA:SMAS摩爾比為1:4.0:1.25,90℃下聚合反應(yīng)1.5h合成減水劑PC(Ⅱ),性能測(cè)試結(jié)果表明PC(Ⅱ)凈漿流動(dòng)度為330mm,減水率達(dá)到32%,28天抗壓強(qiáng)度達(dá)到51.2MPa。精氨酸接枝的APC作為減水劑與PC的性能指標(biāo)相近,在凈漿流動(dòng)性、減水率以及抗壓強(qiáng)度等性能方面效果優(yōu)越,符合國家標(biāo)準(zhǔn)GB 8076-2008規(guī)定的高性能減水劑標(biāo)準(zhǔn)。經(jīng)過紅外表征證明了單酯、大單體以及減水劑的分子結(jié)構(gòu)。因精氨酸中較多的胺基團(tuán)與金屬進(jìn)行配位等作用,增強(qiáng)了減水劑在鋼筋表面的吸附性,有效減少了有害物質(zhì)與鋼筋的接觸,通過阻銹緩蝕性能測(cè)試表明,APC(Ⅱ)在鋼筋緩蝕方面優(yōu)于PC(Ⅱ),能夠同時(shí)抑制陰極和陽極反應(yīng),以抑制陽極腐蝕為主的混合型阻銹劑。
[Abstract]:Water reducing agent and rust inhibitor are the most commonly used cement concrete additives in construction engineering. Polycarboxylic acid superplasticizer is a new type of high efficiency water reducing agent which has been researched and developed rapidly in recent years. It can effectively improve concrete strength, improve performance, save cement consumption and save energy consumption, etc. Amino acids are biodegradable, green and environmentally friendly. It is a promising green rust inhibitor due to its advantages of low price, wide variety and wide source. In this paper, arginine carboxyl group was dissociated by p-toluenesulfonic acid method, and then esterified with excessive polyethylene glycol. The arginine p-toluenesulfonic acid salt AT-capped poly (ethylene glycol) monoester APN was successfully synthesized. APMN I, 鈪，

本文編號(hào)：1910643