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首页> 外文期刊>Journal of Materials Science >Core-shell structure acrylamide copolymer grafted on nano-silica surface as an anti-calcium and anti-temperature fluid loss agent
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Core-shell structure acrylamide copolymer grafted on nano-silica surface as an anti-calcium and anti-temperature fluid loss agent

机译：作为抗钙和抗温液流失剂嫁接在纳米二氧化硅表面上的核 - 壳结构丙烯酰胺共聚物

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摘要

The copolymer (PAAN-SiO2) of acrylamide (AM), 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS), N-vinylpyrrolidone (NVP) and modified nano-silica (M-SiO2) was synthesized by free radical polymerization in a water solution. The composition, micro-morphology and thermal stability properties of PAAN-SiO2 were characterized by Fourier transform infrared spectroscopy, thermal gravity analysis and transmission electron microscopy (TEM). The results showed that AM, AMPS and NVP were successfully grafted onto the surface of M-SiO2 and formed a spherical core-shell structure copolymer. A significant reduction in the filtration volume was achieved after PAAN-SiO2 added, and this phenomenon was even more pronounced after aging at the high temperature. The filtration volume of base slurry containing 2wt% of calcium chloride after aging at 180 degrees C was reduced from 186 to 6ml after adding 2wt% of PAAN-SiO2, which exhibited a special property of anti-calcium contamination at high temperature. The interaction mechanism between PAAN-SiO2 and bentonite and calcium ions was analyzed by particle size analysis, scanning electron microscopy, TEM and X-ray diffraction. Because of the stretching of polymer chain under 180 degrees C that more amide, sulfonic acid groups and cyclic rigid groups were exposed and the strengthening of the connection between PAAN-SiO2 and clay prevents a large amount of ion exchange between Ca2+ and clay layers, reducing the agglomeration of clay. Meantime, the distribution of clay particles was more extensive and some particles with a size of 1-10m plugged the micro-nano-pores on the filter cake, and eventually the thin and compact filter cake was formed.
机译：丙烯酰胺（AM），2-丙基酰胺-2-甲基-1-丙烷磺酸（AMPS），N-乙烯基吡咯烷酮（NVP）和改性纳米二氧化硅（M-SiO 2）的共聚物（Paan-SiO 2）被自由合成水溶液中的自由基聚合。 Paan-SiO2的组成，微观形态和热稳定性特征在于傅里叶变换红外光谱，热重分析和透射电子显微镜（TEM）。结果表明，AM，AMPS和NVP成功接枝到M-SiO 2的表面上，形成球形芯壳结构共聚物。在加入Paan-SiO 2后，实现过滤体积的显着降低，并且在高温下老化后这种现象更加明显。在加入186至6ml后，在加入2wt％的Paan-SiO 2后，在186℃下老化后，含有2wt％的氯化钙的过滤体积从186℃降低，在高温下表现出抗钙污染的特殊性。通过粒度分析，扫描电子显微镜，TEM和X射线衍射分析Paan-SiO2和膨润土和钙离子之间的相互作用机理。由于在180摄氏度下的聚合物链的拉伸，氨化酰胺，磺酸基团和环状刚性基团暴露并强化Paan-SiO 2和粘土之间的连接可防止大量的Ca2 +和粘土层之间的离子交换，减少粘土的凝聚。同时，粘土颗粒的分布更广泛，并且尺寸为1-10m的一些颗粒在滤饼上堵塞微纳米孔，最终形成薄且紧凑的滤饼。

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  • 来源
    《Journal of Materials Science》 |2019年第7期|共15页
  • 作者

    Ma Jingyuan; An Yuxiu; Yu Peizhi;

  • 作者单位

    China Univ Geosci Beijing Sch Engn &

    Technol Beijing 100083 Peoples R China;

    China Univ Geosci Beijing Sch Engn &

    Technol Beijing 100083 Peoples R China;

    China Univ Geosci Beijing Sch Engn &

    Technol Beijing 100083 Peoples R China;

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  • 正文语种 eng
  • 中图分类 工程材料学;
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