本文關(guān)鍵詞： 二氧化硅 機(jī)制砂 潤(rùn)滑油添加劑 凈漿 砂漿　出處：《合肥工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：鑒于納米SiO2易于工業(yè)化生產(chǎn),具有較好的耐熱性、耐壓性等特性,更適合應(yīng)用于鐵路、高速公路、橋梁等建筑領(lǐng)域。然而,納米SiO2比表面積大、表面能極高,易于發(fā)生微粒之間的團(tuán)聚,難以與基料很好結(jié)合,導(dǎo)致材料性能下降,影響納米SiO2微粒所具有的功能得到應(yīng)有的發(fā)揮。因此,本文通過納米SiO2表面改性合成復(fù)合材料,提高納米SiO2的分散性,減少團(tuán)聚,有效的解決上述難題。水泥基復(fù)合材料以硅酸鹽水泥為基體構(gòu)成的復(fù)合材料,廣泛應(yīng)用于房屋、鐵路、公路、橋梁等建筑領(lǐng)域。機(jī)制砂是一種理想的細(xì)骨料,但是機(jī)制砂顆粒粗糙,這勢(shì)必減弱水泥基復(fù)合材料的流動(dòng)性,增加需水量。因此,本文通過高親水聚合物改性水泥基復(fù)合材料,減弱機(jī)制砂對(duì)水泥基復(fù)合材料的流動(dòng)性影響,提高機(jī)制砂的分散性、減少團(tuán)聚。主要工作內(nèi)容如下：(1)利用丙烯酸和MPEG(2.甲基丙烯酸聚乙二醇單甲醚酯)高分子化合物修飾機(jī)制砂(AS)制備一種新型復(fù)合材料,合成的復(fù)合材料能有效的改善機(jī)制砂石粉在水泥中的和易性,同時(shí)提供一種以化學(xué)接枝代替?zhèn)鹘y(tǒng)的物理吸附的理論思路。首先利用硅烷偶聯(lián)劑γ-(甲基丙烯酰氧)丙基三甲氧基硅烷(MPS)與機(jī)制砂石粉表面羥基反應(yīng),使機(jī)制砂石粉表面帶有C=C化學(xué)官能團(tuán),然后與丙烯酸(AA)、MPEG高分子化合物共聚,生成的高分子化合物以化學(xué)鍵的方式鏈接在機(jī)制砂的表面。采用傅里葉變換紅外光譜(FI-IR)、場(chǎng)發(fā)射掃描電鏡、熱重、X射線衍射手段表征了機(jī)制砂石粉的改性效果和結(jié)構(gòu)。將合成的復(fù)合材料以不同的比例摻雜于水泥中,在凈漿實(shí)驗(yàn)中研究合成材料與水泥的流動(dòng)適應(yīng)性和保持性。凈漿實(shí)驗(yàn)表明,修飾后的機(jī)制砂石粉相比未修飾的機(jī)制砂石粉的可流動(dòng)性及其保持性有較大改善,高分子化合物改性后的機(jī)制砂石粉于水泥中的流動(dòng)適應(yīng)性和保持性有顯著的提高,該思路合成的新型材料對(duì)水泥基復(fù)合材料的理論研究有一定的現(xiàn)實(shí)意義。(2)超細(xì)二氧化硅由于其優(yōu)良的摩擦學(xué)性能,在潤(rùn)滑油添加劑領(lǐng)域倍受關(guān)注。本文介紹了超細(xì)二氧化硅的表面結(jié)構(gòu)特征、表面改性機(jī)理及常用的改性方法,著重介紹了醇酯法、硅烷偶聯(lián)劑法及表面聚合物接枝改性法,并對(duì)其改性趨勢(shì)作了進(jìn)一步探究。最后概述了超細(xì)二氧化硅在潤(rùn)滑油中的應(yīng)用,并展望了其在潤(rùn)滑油中的應(yīng)用發(fā)展趨勢(shì)。
[Abstract]:Because nanometer SiO2 is easy to industrialize and has good heat resistance, pressure resistance and so on, it is more suitable for application in railway, highway, bridge and other construction fields. However, nanometer SiO2 has a large specific surface area. The surface energy is very high and it is easy to reunite between particles, which makes it difficult to combine well with the base material, which leads to the deterioration of material properties, which affects the function of SiO2 nanoparticles to be played. In order to improve the dispersity and reduce the agglomeration of nano SiO2, the surface modification of nano SiO2 was used to synthesize the composite. Cement matrix composite composed of Portland cement is widely used in building, railway, highway, bridge and other construction fields. The machine-made sand is an ideal fine aggregate. However, the mechanism sand particles are rough, which will weaken the fluidity of cement matrix composites and increase water demand. Therefore, the high hydrophilic polymer is used to modify the cement matrix composites in this paper. The influence of machine-made sand on the fluidity of cement-based composites is weakened, and the dispersion of machine-made sand is improved. Reducing agglomeration. The main work is as follows: 1) A new composite material was prepared by using acrylic acid and MPEGG 2. Methacrylic acid poly (ethylene glycol monomethyl ether ester) modified macromolecule compound (ASA). The composite material can effectively improve the properties of machine-made sand and stone powder in cement. At the same time, it provides a theoretical idea of chemical grafting instead of traditional physical adsorption. Firstly, the silane coupling agent 緯-(methacrylol) propyl trimethoxy silane (MPS) is used. Reaction with hydroxyl group on the surface of machine-made sand and stone powder. The surface of the mechnical sand powder was made with Con C chemical functional group, and then copolymerized with acrylic acid (AA) and MPEG macromolecule compound. The resulting polymer compounds were linked to the surface of the machine-made sand by chemical bonds. Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (SEM) and thermogravimetry (TGA) were used. The modified effect and structure of the machine-made sand powder were characterized by X-ray diffraction. The synthesized composites were doped into cement in different proportions. The fluidity and maintainability of synthetic materials and cement were studied in the slurry experiment. The results showed that the fluidity and retention of modified machine-made sand and stone powder were much better than that of unmodified machine-made sand and stone powder. The flow adaptability and maintainability of the machine-made sand and stone powder modified by polymer compounds in cement were improved significantly. The new material synthesized by this method has a certain practical significance for the theoretical study of cement matrix composites. The ultrafine silicon dioxide has excellent tribological properties due to its excellent tribological properties. In this paper, the surface structure characteristics, surface modification mechanism and common modification methods of ultrafine silica are introduced, with emphasis on alcohol-ester method. The methods of silane coupling agent and surface polymer grafting modification were further explored. Finally, the application of ultrafine silica in lubricating oil was summarized. The development trend of its application in lubricating oil is prospected.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB332;TE624.82

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 王平華,嚴(yán)滿清,唐龍祥;納米粒子表面修飾與改性——SiO_2納米粒子表面接枝聚合[J];高分子材料科學(xué)與工程;2003年05期

2 艾長(zhǎng)發(fā);彭浩;胡超;周永武;屠凌波;;機(jī)制砂級(jí)配對(duì)混凝土性能的影響規(guī)律與作用效應(yīng)[J];混凝土;2013年01期

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本文編號(hào)：1467613