采用溶液聚合法,选用Ziegler-Natta催化剂,将1-戊烯作为单体之一,合成了1-戊烯/1-辛烯/1-十二烯三元共聚物减阻剂,通过核磁共振仪(13C NMR)、傅里叶变换红外光谱计(FT-IR)、X射线衍射(XRD)对聚合物的结构与性质进行了表征,并采用室内环道装置评价了聚合物的减阻性能.采用响应面分析法通过建立减阻率与各因素之间的Box-Behnken数学模型,对三元共聚工艺进行优化,最优聚合条件为:戊烯量0.07 ml,十二烯:辛烯=4,主催化剂量0.07 g,助催化剂量0.4 ml,在此条件下得到的三元共聚物在添加量10×10-6时减阻率为59.79%.在实验选取的添加量范围内,各因素对减阻率影响显著性顺序为:戊烯添加量>助催化剂用量>主催化剂用量>十二烯:辛烯;各因素之间的交互作用也显著存在.引入戊烯制备所得的减阻剂结晶度下降,溶解效果明显优于1-辛烯/1-十二烯二元共聚物,减阻率得到了提高.%Using 1-pentene as one of the monomers, Ziegler-Natta catalyst as catalyst, 1-pentene/1-octene/ 1-dodecene terpolymer was synthesized by solvent polymerzation. The terpolymer was characterized by13C NMR, FT-IR and XRD. The drag reduction efficiency of the terpolymer was evaluated by an indoor loop pipeline experimental apparatus. The Box-Behnken mathematical relational model between drag reduction rate and affecting factors was established, and the technology of preparing terpolymer was optimized. The optimum preparation conditions were: 0.07 ml 1-pentene, dodecene:octene=4, 0.07 g main catalyst, 0.4 ml cocatalyst, when the dosage of the terpolymer is 10×10-6, the drag reduction rate is 59.79%. The order of main factors affecting thedrag reduction rate was: 1-pentene>cocatalyst>catalyst>dodecene:octene in the range of the experiment selected. The combined influence of the factors was also outstanding. The crystallinity of synthetic terpolymer was significantly decreased due to the introduction of 1-pentene, the solubleness was much better than 1-octene/1-dodecene bipolymer, and the drag reduction rate was improved.
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