壳聚糖改性疏水缔合聚丙烯酰胺的制备及表征

doi:10.16085/j.issn.1000-6613.2018-2325

摘要/Abstract

摘要：

为了改善疏水缔合聚丙烯酰胺的溶解性以及溶液稳定性，本文采用巯基壳聚糖对疏水缔合聚丙烯酰胺进行改性，红外表征结果说明巯基壳聚糖连接到了聚丙烯酰胺分子链上。对影响壳聚糖改性实验的因素进行分析，实验结果说明，壳聚糖中巯基含量增大、壳聚糖加入量增大以及改性反应温度升高都会造成聚合物分子量降低，当改性反应的反应温度不高于35℃、添加壳聚糖质量不高于单体质量的3%时，得到的改性聚合物分子量满足现场使用要求。对改性聚合物的溶解性及溶液稳定性进行了评价，结果表明，壳聚糖中巯基含量增大及壳聚糖加入量增大对聚合物溶解性及溶液稳定性有明显的改善，聚合物的溶解时间由改性前的150min最多缩短至20min，聚合物溶液黏度保留率由改性前的60%最多提高到90%以上，壳聚糖改性有望弥补疏水缔合聚合物现场使用中的一些不足。

关键词: 壳聚糖, 聚丙烯酰胺, 疏水缔合, 巯基

Abstract:

In order to improve the solubility and solution stability of hydrophobic associated polyacrylamide, the hydrophobic associated polyacrylamide was modified by the thiolated chitosan. The FTIR spectra showed that thiolated chitosan has connected to the molecular of the hydrophobic associated polyacryamide. The factors affecting the modification of chitosan were analyzed. The result showed that the modified polymers` molecular weight decreased with the increase of the concentration of thiol group in chitosan, the quality of adding chitosan and the modified reaction temperature, and the modified polymers` molecular weight met the requirement of oilfield, when the modified reaction temperature is not higher than 35℃ and the quality of adding chitosan is not higher than 3% of the quality of monomer. The solubility and solution stability of modified polymers were evaluated. The result showed that the increase of the concentration of thiol group in chitosan and the quality of adding chitosan effectively improved the performance of the hydrophobic associated polyacrylamide. The dissolution time of the polymer was shortened from 150 minutes before modification to 20 minutes, and the retention rate of the viscosity of the polymer solution was increased from 60% to more than 90%. The chitosan modification is expected to make up for some deficiencies in the hydrophobic associated polyacrylamide.

Key words: chitosan, polyacrylamide, hydrophobic associated, thiol group

中图分类号:

滕大勇, 滕厚开, 靳晓霞, 徐俊英, 方健, 周立山. 壳聚糖改性疏水缔合聚丙烯酰胺的制备及表征[J]. 化工进展, 2019, 38(07): 3384-3389.

Dayong TENG, Houkai TENG, Xiaoxia JIN, Junying XU, Jian FANG, Lishan ZHOU. Synthesis and characterization of chitosan modified hydrophobic associated polyacrylamide[J]. Chemical Industry and Engineering Progress, 2019, 38(07): 3384-3389.

图/表 9

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组成	含量/mg·L^-1
NaCl	6623
NaHCO₃	131
Na₂SO₄	204
CaCl₂	1734
MgCl₂.6H₂O	2077
总矿化度	9180

组成	含量/mg·L^-1
NaCl	6623
NaHCO₃	131
Na₂SO₄	204
CaCl₂	1734
MgCl₂.6H₂O	2077
总矿化度	9180

序号	CS∶NAC∶HOBT∶EDAC/(摩尔比)	巯基含量/μmol·g^-1
1	1∶1∶0∶2	19.1±1.4
2	1∶1∶1∶2	155.8±11.1
3	1∶1∶1∶4	168.8±11.0
4	1∶1∶1∶8	119.01±1.2
5	1∶1∶2∶2	130.2±11.5
6	1∶2∶1∶4	370.4±27.3
7	1∶2∶1∶8	421.5±35.4
8	1∶2∶1∶16	242.2±22.5
9	1∶3∶1∶8	429.3±29.6
10	1∶4∶1∶8	589.3±38.6

序号	CS∶NAC∶HOBT∶EDAC/(摩尔比)	巯基含量/μmol·g^-1
1	1∶1∶0∶2	19.1±1.4
2	1∶1∶1∶2	155.8±11.1
3	1∶1∶1∶4	168.8±11.0
4	1∶1∶1∶8	119.01±1.2
5	1∶1∶2∶2	130.2±11.5
6	1∶2∶1∶4	370.4±27.3
7	1∶2∶1∶8	421.5±35.4
8	1∶2∶1∶16	242.2±22.5
9	1∶3∶1∶8	429.3±29.6
10	1∶4∶1∶8	589.3±38.6

时间/d	PAM黏度/mPa·s	PAM-C1黏度/mPa·s			PAM-C2黏度/mPa·s			PAM-C3黏度/mPa·s
时间/d	PAM黏度/mPa·s	1%	2%	3%	1%	2%	3%	1%	2%	3%
0	500	500	500	500	500	490	480	500	470	450
60	300	335	370	420	340	380	430	350	400	460