本文選題：AOS + 水泥漿　； 參考：《陜西科技大學(xué)》2015年碩士論文

【摘要】：水泥混凝土在我國的消耗量在逐年增大,如今已處在世界前幾位。水泥的制備不復(fù)雜,可以鑄成任意形狀,強(qiáng)度高,對(duì)環(huán)境污染小,所以用途十分廣泛。水利、石材、建筑、國防等都離不開水泥混凝土。然而,隨著如今的科學(xué)技術(shù)發(fā)展和環(huán)保體系的不斷完善,水泥混凝土改制改良已經(jīng)迫在眉睫。現(xiàn)代工業(yè)要求的水泥需具備高強(qiáng)、早凝、輕質(zhì)和耐用性等特點(diǎn)。經(jīng)過研究證實(shí),為了提高水泥混凝土的綜合特性,外加水泥添加劑是一種不錯(cuò)的辦法。21世紀(jì)的工業(yè)建筑標(biāo)準(zhǔn)越來越高,使得水泥混凝土的特性必須非常好。在水泥懸浮體系中,水泥外加劑已經(jīng)成為了不可或缺的組分。水泥分散劑作為眾多水泥混凝土外加劑的其中一種,能高效的改善水泥的標(biāo)準(zhǔn)和質(zhì)量。因水泥分散劑易制、價(jià)格低廉且見效快,各個(gè)國家都在建筑工業(yè)中廣泛使用水泥分散劑,如挪威、美國等,水泥分散劑的使用率達(dá)到了60%以上。分散劑的作用有很多,如潤濕、助磨、稀釋和穩(wěn)定。加入水泥漿后,可以定量減少水的外添加量,起到降低成本、降低能源消耗和環(huán)保的作用。同時(shí)水泥分散劑明顯增加了水泥漿的固含量,且黏度低,容易攪拌,降低了人力成本。攪拌均勻后的水泥分散體系穩(wěn)定而均勻。本文以α-烯烴磺酸鈉為單體,過氧化苯甲酰為引發(fā)劑,次亞磷酸鈉為鏈轉(zhuǎn)移劑,采用溶液聚合法,通過自由基共聚制備了聚α-烯烴磺酸鈉,研究了聚合工藝對(duì)聚合物性能的影響。使用紅外光譜對(duì)聚合物進(jìn)行結(jié)構(gòu)表征。通過表面張力儀、接觸角測量儀、水煤漿粘度計(jì)和流變儀研究了產(chǎn)物的表面活性、潤濕性能和分散性能。通過分水法、攪動(dòng)法分別考察了產(chǎn)物的乳化性能和起泡性能。通過熱失重分析考察了產(chǎn)物的熱穩(wěn)定性。完成了單因素實(shí)驗(yàn),考查了不同單因素條件下分散劑對(duì)水泥漿的影響,確定了最佳聚合反應(yīng)工藝,以最佳反應(yīng)條件進(jìn)行制漿,進(jìn)行聚合物的物化性能檢測和應(yīng)用性能研究。研究了不同分散劑摻量、水泥漿pH值、溫度、Zeta電位等條件下水泥漿性能;將聚α-烯烴磺酸鈉與木質(zhì)素磺酸鈉進(jìn)行復(fù)配,得到復(fù)配分散劑,并研究了復(fù)配分散劑對(duì)水泥漿效果的應(yīng)用性能。實(shí)驗(yàn)結(jié)果表明:(1)最佳聚合反應(yīng)工藝:W(BPO)=0.7%(以單體質(zhì)量計(jì)算),W(SHP)=4%(以單體質(zhì)量計(jì)算),緩慢滴加引發(fā)劑,采用梯度升溫,最高反應(yīng)溫度為80℃,總反應(yīng)時(shí)間4h,最后用氫氧化鈉調(diào)節(jié)pH值為7~9,得到黃色透明油狀分散液,即聚α-烯烴磺酸鈉分散劑。(2)紅外光譜結(jié)果證明原料單體已經(jīng)聚合,25℃下產(chǎn)物的CMC為5.9×10-2mol·L-1,表面張力為37.3mN·m-1,在煤塊表面的接觸角為32.30°,表明其具有較高的表面活性和潤濕性能;聚α-烯烴磺酸鈉耐熱溫度為300℃左右,此外聚α-烯烴磺酸鈉還表現(xiàn)出良好的乳化性能和起泡性能。(3)通過考察在不同分散劑添加量、溫度、pH和Zeta電位變量下,分散劑對(duì)水泥漿的分散效果,確定了水泥漿制備的最佳技術(shù)為:常溫、水泥漿pH值約為7~9,聚α-烯烴磺酸鈉摻量為0.5%時(shí),水泥漿的Zeta電位變化趨于穩(wěn)定。(4)使用聚α-烯烴磺酸鈉分散劑與木質(zhì)素磺酸鈉進(jìn)行復(fù)配,考察了不同復(fù)配比例的分散劑對(duì)水泥漿黏度的變化影響,實(shí)驗(yàn)結(jié)果表明,當(dāng)聚α-烯烴磺酸鈉和木質(zhì)素磺酸鈉的質(zhì)量比為1:1時(shí),水泥漿黏度最低。
[Abstract]:The consumption of cement and concrete in our country is increasing year by year, and now it is in the top of the world. The preparation of cement is not complex, it can be cast into arbitrary shape, high strength, low pollution to the environment, so it is very widely used. Water, stone, building, national defense and so on can not be separated from cement coagulating soil. However, with the development of science and technology and environmental protection body today With the continuous improvement of the system, the improvement of cement and concrete is imminent. The requirements of modern industry are characterized by high strength, early setting, light quality and durability. In order to improve the comprehensive characteristics of cement concrete, it is a good way to add cement additive to the.21 century, which makes the industrial building standards higher and higher. Cement concrete must be very good. Cement admixture has become an indispensable component in cement suspension system. As one of the many cement concrete admixtures, cement dispersing agent can improve the standard and quality of cement efficiently. As cement dispersant is easy to be made, the price is low and effective, all countries are building Cement dispersants, such as Norway and the United States, have been widely used in the construction industry, such as Norway and the United States. The use of cement dispersants has reached more than 60%. The dispersant has a lot of effects, such as wetting, grinding, dilution and stability. After adding cement slurry, the addition of water can be reduced and the energy consumption and environmental protection can be reduced. Meanwhile, the cement dispersion is reduced. The cement slurry has obviously increased the solid content, and the viscosity is low, it is easy to stir and reduce the cost of manpower. The cement dispersion system after mixing is stable and uniform. In this paper, we use sodium alkenes sulfonate as monomer, benzoyl peroxide as initiator, sodium hypophosphite as chain transfer agent, solution polymerization method to prepare poly alpha by free radical copolymerization. The effect of polymerization process on the properties of polymer was studied. The structure of the polymer was characterized by infrared spectroscopy. The surface activity, wettability and dispersion of the products were studied by surface tension meter, contact angle measuring instrument, coal water slurry viscometer and rheometer. The emulsification of the products was examined through the method of over water and agitation. The thermal stability of the products was investigated by thermal weight loss analysis. A single factor experiment was completed. The effect of dispersant on cement slurry under different single factor conditions was examined. The optimum polymerization process was determined. The optimum reaction conditions were made. The physical and chemical properties of the polymer were tested and the application performance was studied. The mixing amount of different dispersant, pH value of cement slurry, temperature, Zeta potential and so on, the compound dispersant of poly alpha alkenosulfonate and sodium lignosulfonate was obtained, and the application performance of the compound dispersant to cement slurry was studied. The experimental results showed that (1) the optimum polymerization process: W (BPO) =0.7% (with monomer mass) Calculation), W (SHP) =4% (in single mass calculation), slowly adding initiator, gradient heating, the maximum reaction temperature 80 C, the total reaction time 4h, the final use of sodium hydroxide to adjust pH value of 7~9, the yellow transparent oil dispersions, namely poly alpha alkenes sodium sulfonate dispersions. (2) infrared spectrum results show that the monomer has been polymerized and produced at 25. The CMC is 5.9 * 10-2mol. L-1 with a surface tension of 37.3mN. M-1 and a contact angle of 32.30 degrees on the surface of coal. It shows that it has high surface activity and wetting property. The heat resistance of poly alpha olefin sodium sulfonate is about 300 degrees C. In addition, poly alpha olefin sodium sulfonate also exhibits good emulsifying properties and foaming properties. (3) through investigation in different points. The dispersion effect of dispersant, temperature, pH and Zeta potential, and the dispersion effect of dispersant on cement slurry, determine the best technology for cement slurry preparation: at normal temperature, the pH value of cement slurry is about 7~9, when the content of poly alpha alkene sulfonate is 0.5%, the change of Zeta potential of cement slurry tends to be stable. (4) the use of poly alpha olefin sodium sulfonate dispersant and sodium lignosulfonate. The effect of different proportions of dispersants on the viscosity of cement slurry was investigated. The experimental results showed that when the mass ratio of sodium alkenes sulfonic acid sodium and sodium lignosulfonate was 1:1, the viscosity of cement slurry was the lowest.

【學(xué)位授予單位】：陜西科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：O631;TQ172.46

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相關(guān)期刊論文 前2條

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本文編號(hào)：1881344