疏水缔合聚合物湍流减阻特性影响因素

Study on the influencing factors of the drag reducing characteristics of hydrophobically associative water-soluble polymer

摘要:

本文采用自行设计的气驱流体阻力测试装置，研究了分子量、疏水单体比例和水解度对疏水缔合聚合物（HAWP）湍流减阻特性的影响；并且与ESEM观测不同浓度范围的HAWP水溶液的微观结构进行比对，讨论了HAWP的减阻机理。实验结果表明：当分子量大于1000×104 g/mol时，其减阻率在浓度为200mg/L处和临界缔合浓度（CAC）处存在双峰值，对应两种不同的减阻机理；当分子量小于1000×104 g/mol时，仅在CAC处存在单一峰值；分子量越大第一峰值越高，分子量越小第二峰值越高。浓度小于CAC时，HAWP疏水单体比例越大，减阻率越小，而随着浓度的增大，疏水单体比例越大的，减阻率上升越快，而当浓度大于CAC时，则出现疏水单体比例越大、减阻率越高的现象。HAWP在实验浓度范围内，减阻率均随着水解度的增大而增大。

Abstract:

In this paper, the effects of molecular weight, hydrophobic monomer proportion and hydrolysis degree on turbulent drag reduction (DR) characteristics of hydrophobically associative water-soluble polymers (HAWP) were investigated using a self-designed air-driven fluid resistance test apparatus. Compared with the microstructure of different concentration observed by ESEM, DR mechanism of HAWP was discussed. The results of experiments show that: when molecular weight is above 1000×104 g/mol, DR ratio has two peak values respectively at the concentration of 200mg/L and the critical association concentration (CAC), otherwise DR ratio only has one peak value at around CAC. The HAWP with higher molecular weight has greater 1st peak value and the HAWP with lower molecular weight has greater 2nd peak value. When concentration below CAC, the HAWP with greater hydrophobic monomer proportion has weaker DR ability, but when concentration goes above CAC，the HAWP with greater hydrophobic monomer proportion has stronger DR ability. The HAWP with greater hydrolysis degree always has stronger DR ability within the test concentration range.