Synthesis and characterization of high-temperature self-crosslinking polymer latexes and their application in water-based drilling fluid
Synthesis and characterization of high-temperature self-crosslinking polymer latexes and their application in water-based drilling fluid
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DOI：
10.1016/j.powtec.2021.05.045
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发表时间：
2021-05-26
影响因子：
5.2
通讯作者：
Chen, Weiqing
中科院分区：
文献类型：
--
作者：
Lei, Ming;Huang, Weian;Chen, Weiqing
以N-羟甲基丙烯酰胺(NAM)为高温自交联剂，2-丙烯酰胺-2-甲基-1-丙磺酸为反应乳化剂，以甲基丙烯酸甲酯和苯乙烯为原料，采用半连续聚合法合成了自交联型无皂乳液(PMS)。所有不同NAM含量(0-7wt%)的PMS胶乳都具有较高的固含量(接近30%)和单分散的纳米-微米粒子尺寸(180-600 nm)。随着NAM含量的增加，单体转化率略有下降，粒径先减小后逐渐增大，凝固物含量增加。自交联行为与NAM含量和温度有很强的相关性，并用FT-IR、XPS、DSC和SEM对自交联结构进行了表征。自交联胶乳有效地改善了膨润土基钻井液的流变性和微孔滤失性能。由于粒子间相互作用较强，热处理后的胶乳表现出较好的增粘效果和较强的高温降滤失能力。微孔封堵机理除物理桥联和填充外，还表现为热变形和自交联膜形成的共同作用。(C)2021年爱思唯尔B.V.保留所有权利。
Self-crosslinking soap-free latexes (PMS) were synthesized by semi-continuous polymerization from methyl methacrylate and styrene with N-(hydroxymethyl)acrylamide (NAM) as high-temperature self-crosslinker and 2-acrylamido-2-methyl-1-propanesulfonic acid as reactive emulsifier. All PMS latexes with varying NAM contents (0-7 wt%) processed high solid contents (similar to 30%) and monodispersed nano-micro particle sizes (180-600 nm). With augment of NAM content, monomer conversion slightly decreased while particle size decreased and then gradually increased, accompanied with increase of coagulum content. The self-crosslinking behavior showed highly dependence on NAM content and temperature, and the self-crosslinked structures were confirmed by FT-IR, XPS, DSC and SEM. The self-crosslinking latexes effectively improved rheological and microporous filtration properties of bentonite-based drilling fluid. Owing to stronger interparticle interactions, the latexes exhibited better viscosity-increasing effect after thermal treatment and stronger fluid-loss-reducing ability at high temperature. The microporous plugging mechanism was revealed to be the combination of heat deforming and self-crosslinking film forming besides physical bridging and filling. (C) 2021 Elsevier B.V. All rights reserved.