不同醇類製備聚丙烯酸酯應用於水泥基材的行為研究; The research on poly acrylic esters made from different alcohols applied to the cement matrix.

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题名:	不同醇類製備聚丙烯酸酯應用於水泥基材的行為研究;The research on poly acrylic esters made from different alcohols applied to the cement matrix.
作者:	王年福;Nian-Fu WANG
贡献者:	土木工程研究所
关键词:	水泥基材;酯化反應;聚丙烯酸酯;Poly Acrylic Ester;esterification reaction;cement matrix
日期:	2011-07-25
上传时间:	2012-01-05 11:09:08 (UTC+8)
摘要:	聚合物應用於水泥基材以改善其性能，是有機與無機複合材料的發展趨勢，也取得了一定的成效，但如何對聚合物在產生與應用上的關聯性進行整合，讓有機聚合物領域的研究者更瞭解應用使用者的需求；也相對讓無機領域的水泥基材使用者，能從使用成效的觀點，對原本陌生的聚合物提供一些建議，達成不斷轉動P(Plan-計劃)-D(Do-實施)-C(Check-查驗)-(Action-改善行動)的良性改善循環，有效提高研究互動與提昇產品成效，其重要性高於個別領域的單打獨鬥，本研究以聚丙烯酸酯為介質，從系列的規劃，透過基本的反應取得，到試驗室分析測試評估，再進行改善，完成了良好的研究循環，除獲致了初步的成效外，也提供了良好的模版。在以乙醇、乙二醇、二乙二醇等三種醇類製成聚丙烯酸酯(Poly Acrylic Ester , PAE)，透過粉體特性及進一步的新拌及硬固漿體篩選程序，顯示聚丙烯酸乙二酯粉體與促進劑的組合摻用具有30?60分鐘緩凝效果，同時增加新拌水泥漿體流動性，尤其長時間（90~120分鐘）的流動性增加5~10%；吸水率與吸水膨脹率亦有效減少；但在強度上則成效不佳，此說明在應用上，粉體聚合物受到一定的限制。在以乙醇、乙二醇、二乙二醇、月桂醇及硬脂醇等五種醇類與聚丙烯酸進行酯化反應而得的液態聚丙烯酸酯。試驗結果綜合評估顯示，酸-醇莫爾比為0.2的聚丙烯酸乙二酯，最具改質成效，同時以0.1%為最佳添加量，改質後，相對於控制組，水泥漿、水泥砂漿與水泥混凝土28天抗壓強度分別提升12.7%、8.6%與9.9%，水泥砂漿的28天抗彎與粘結強度分別提升10.0%與73.9%；同時水泥砂漿在流動性有效增加9.8%、吸水率減少10.8%、各齡期乾燥收縮(長度變化)有效減少7.1%~14.5%、健性試驗的最終重量損失率則減少23.4%﹔此外，改質混凝土超音波波速試驗的波速增加6.9%、動彈性模數增加33.3%、快速氯離子穿透試驗(RCPT)56天齡期試體6小時累積通電量降低19.8%，顯示了耐久性與緻密性的提昇。SEM觀測也印證實聚丙烯酸酯薄膜在改質水泥基材中的形成。在以乙醇、乙二醇、二乙二醇等三種醇類，透過酸-醇比、溫度、時間、催化劑等參數探討及純化處理的優化研究中，綜合試驗結果顯示，較高的反應溫度(90 oC)、適度的反應時間(60分鐘)、適量的催化劑濃度(酸醇總重量1 %)，可獲致改質成效最佳的聚丙烯酸乙二酯和聚丙烯酸二乙二酯，同時其最佳酯化率分為17.87 %(乙二醇莫耳比為0.271時)及19.66 %(二乙二醇莫耳比為0.291時)；純化則以1.0 %雙氧水劑量為佳，同時以聚丙烯酸二乙二酯的改質成效最佳，並以0.1%為最佳添加量，改質後，相對於控制組，水泥漿、水泥砂漿與水泥混凝土28天抗壓強度分別提升14.8%、15.1%與14.1%，水泥砂漿的28天抗彎與粘結強度分別提升12.1%與116.7%；同時流動性有效增加，減水效果達6.2%；各齡期乾燥收縮(長度變化)有效減少36.2%~52.7%、健性試驗的最終重量損失率則減少15.4%﹔此外，改質混凝土各齡期超音波波速試驗的波速增加0.9%~5.6%﹔快速氯離子穿透試驗(RCPT)28天齡期試體6小時累積通電量降低2.82%，顯示了耐久性與緻密性的提昇。混凝土模擬火害窯燒試驗的試體強度折減改善39.3%，也證實了其可延長混凝土受高溫環境下的抵抗能力。最終，以性價比評估結果顯示，優化後的液體聚合物改質水泥砂漿，其性價比明顯高於普通水泥砂漿，最高者甚至可達3倍以上。 The polymer used in the cement matrix to improve its performance is seen as the development trends of organic and inorganic compound materials, and it also achieves some success. However, it is more important to integrate the connection between the generation and application of polymers than to research individually in the respective field. It can make the researchers in the organic polymer field understand better the needs of the users; relatively, it also makes the users in the inorganic cement matrix, who are originally strange to polymers, from the viewpoint of using effectiveness, offer some suggestions to achieve continuous rotation P (Plan) - D (Do) - C (Check) - (Action). It is a benign improving cycle that effectively improves the research interaction and enhances the products. In this study, acrylic ester is used for the medium, from series of planning, acquisition of the ester through basic reaction, to the analysis test assessment in the laboratory, and further improvement. In this way, we complete a good research cycle. In addition to the preliminary effectiveness, we also provide a good template. The test results of powder-polymer mortar showed that the powder-polymer mixed with the accelerator had a 30-60 minute retarding effect, which could increase the flowability of modified mortar, especially for a long time (90 ~120 minutes) with the increasing flowability of 5 to 10%; in part experimental conditions, the polymer modified cement mortar had increasing effects on Flexural and compressive strength; the water-absorptivity and the water-absorbing expansion rate also effectively reduced. Besides, it was found, with different types and dosages of the superplasticizers which were mixed to control the equally initial fluidity, the powder- polymer would affect the effectiveness of the cement mortar. From the esterification of acrylic acid and three different kinds of alcohols,ethanol, ethylene glycol and diethylene glycol, we got Poly Acrylic Ester (PAE). Through the powdered characteristics and the screening process of fresh mixed and hardened paste, the test results showed that glycol acrylate powdered polymer mixed with the accelerator had a 30-60 minute retarding effect, which could increase the flowability of fresh mixed mortar, especially for a long time (90 ~120 minutes) with the increasing flowability of 5 ~10%; the water-absorptivity and the water-absorbing expansion rate also effectively reduced. But it was not so good in strength, showing that the powdered polymer had certain restrictions when it was applied. From the esterification of acrylic acid and five different kinds of alcohols,ethanol,ethylene glycol,diethylene glycol,lauryl alcohol and stearyl alcohol, we got Poly Acrylic Ester polymer in liquid. Compressive assessment test results showed that at the acid-alcohol mole ratio of 0.2, glycol acrylate polymer had the most effective modification,and the hardened properties were the best with the additive of 0.1%. Compared with the control group,after modification,the 28-day compressive strength of the modified cement paste,mortar and concret improved separately by 12.7%, 8.6% and 9.9%; the 28-day flexural strength and adhensive strength of the modified mortar improved separately by 10.0% and 73.9%；besides,the flowability of the modified mortar effectively increased by 9.8%, and 10.8% less water absorption; the dry shrinkages of different ages (length change) effectively decreased by 7.1%-14.5%, and the perventage of final weight loss of the soundness test decreased by 23.4%. In addition,in the supersonic velocity test, the velocity of the modified mortar improved by 6.9%, the dynamic elastic modulus by 33.3%, and in the rapid chloride ion penetration test (RCPT), 6-hour cumulative passing electricity of the 56-day-age specimen decreased by 19.8%, showing its promotion of durability and compactness. The SEM observation also confirmed that the PAE’s membrane formed in the modified cement matrix. Purified by the three alcohols,ethanol,ethylene glycol and diethylene glycol,and through acid-alcohol ratio,temperature,time,catalyst and other parameters,we probed into the optimized study of purification. The comprehensive test results showed that we could get the best modified Glycol Acrylate and Diethylate glycol Acrylate with higher reaction temperature (90 ℃), moderate reaction time (60 minutes) and the right amount of concentration of catalyst (1% of the total weight of acid and alcohol). The best esterification rate is respectively 17.87% (at the ethylene glycol mole ratio of 0.271) and 19.66% (at the diethylene glycol mole ratio of 0.291 ). We got the best purification by adding 1.0% dose of hydrogen peroxide and Diethylate glycol Acrylate polymer had the most remarkable effect of modification by the additive of 0.1%. Compared with the control group,after modification,the 28-day compressive strength of the modified cement paste,mortar and concret improved separately by 14.8%, 15.1% and 14.1%; the 28-day flexural strength and adhensive strength of the modified mortar improved separately by 12.1% and 116.7%.Besides,the flowability of the modified mortar effectively increased by 6.3% less water absorption; the dry shrinkages of different ages (length change) effectively decreased by 36.2%~52.7%, and the perventage of final weight loss of the soundness test decreased by 15.4%. In addition,in the supersonic velocity test, the velocity of the modified mortar improved by 0.2%~5.9%, the dynamic elastic modulus by 33.3%, and in the rapid chloride ion penetration test (RCPT), 6-hour cumulative passing electricity of the 28-day-age specimen decreased by 2.82%, showing its promotion of durability and compactness. In the concrete fire damage kiln simulation experiments,the strength reduction of the specimen improved by 39.3%, also confirming that it could prolong the concrete resistant strength under high temperature. Ultimately, the performance-cost assement results show that the optimized liquid polymer modified cement mortar, its performance-cost value is higher than that of ordinary Portland cement mortar, the highest or even up to 3 times.
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