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| 聚磷酸酯抑制AMDAC冻胶失水机制 |
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何绍群1,2,汪庐山2,郑万刚2,于田田2,戴彩丽1,陈立峰3
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(1.中国石油大学(华东)石油工程学院,山东青岛 266580;2.中国石化胜利油田分公司,山东东营 257000;3.长江大学石油工程学院,湖北武汉 430100)
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| 摘要: |
| 考察聚磷酸酯(PAE)对丙烯酰胺/丙烯酰氧乙基三甲基氯化铵共聚物(AMDAC)冻胶失水规律的影响,研究PAE对冻胶微观形貌、AMDAC流体力学直径、重均相对分子质量、黏度的影响,通过红外光谱技术分析PAE抑制冻胶失水的作用机制。结果表明:PAE可有效抑制冻胶失水;基于PAE与AMDAC的水解反应,PAE与AMDAC之间发生交联反应生成C—O—P化学键,该交联反应使得AMDAC分子的流体力学直径、重均相对分子质量、溶液黏度增大,冻胶持水能力获得提高;PAE与AMDAC的交联反应使冻胶由单基团交联(酚醛与胺基交联)变为双基团交联,冻胶初始网格密度增大,冻胶中的水更加牢固地固定在网格中;PAE与AMDAC的交联反应生成了热稳定性优异的高分子氨基磷酸酯,交联后的AMDAC热稳定性获得极大提高,分子链不易发生断裂,从而改善了高温条件下冻胶的稳定性。 |
| 关键词: 聚磷酸酯 收缩失水 冻胶 交联机制 |
| DOI：10.3969/j.issn.1673-5005.2019.03.014 |
| 分类号::TQ 225.261 |
| 文献标识码:A |
| 基金项目:中石化重点攻关项目(217024) |
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| Mechanism of PAE inhibiting syneresis of AMDAC gel |
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HE Shaoqun1,2, WANG Lushan2, ZHENG Wangang2, YU Tiantian2, DAI Caili1, CHEN Lifeng3
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(1.School of Petroleum Engineering in China University of Petroleum(East China), Qingdao 266580, China;2.Shengli Oilfield Company of SINOPEC, Dongying 257000, China;3.College of Petroleum Engineering in Yangtze University, Wuhan 430100, China)
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| Abstract: |
| The effect of sodium tripolyphosphate (PAE)on the syneresis of the hydrogel formulated with acrylamide copolymer of acryloyloxyethyltrimethyl ammonium chloride (AMDAC) was investigated.And the influence of PAE on the microstructure of gel, the hydrodynamic radius, weight-average molecular weight and viscosity of AMDAC were studied as well. Besides, the mechanism of PAE inhibiting the syneresis of gel was characterized by infrared spectroscopy. It is found that PAE can inhibit the gel syneresis effectively. Due to the hydrolysis reaction of PAE and AMDAC, the crosslinking reaction occurs between PAE and AMDAC, which produces the C-O-P bond. In this way, the viscosity, weight-average molecular weight and hydrophilicity of AMDAC are significantly increased by PAE, whereby the water-holding capacity of the gel is improved. Besides, the above crosslinking reaction changes the gel from single group crosslinking (crosslinking between phenolic and amino) to double groups crosslinking, leading to the increase of initial mesh density of the gel.Hence, the water in gel is firmly fixed in the grid. In addition, this crosslinking reaction generates the poly-phosphoramidate with excellent thermal stability, whereby the thermal stability of the crosslinked AMDAC increases and the macromolecular chain is not easy to be destroyed.Therefore the gel stability at high temperature is improved. |
| Key words: sodium tripolyphosphate syneresis gel crosslink mechanism |
