EVA-g-MAH聚合物降凝剂的制备及性能  

Preparation and Properties of EVA-g-MAH Polymer Pour Point Depressant

作　　者：张丽娜 孙征楠 荆国林[1] 刘晓燕 刘洋 杨依海 Lina Zhang;Zhengnan Sun;Guolin Jing;Xiaoyan Liu;Yang Liu;Yihai Yang(Provincial Key Laboratory of Oil&Gas Chemical Technology,College of Chemistry&Chemical Engineering,Northeast Petroleum University,Daqing 163318,China)

机构地区：[1]东北石油大学化学化工学院石油与天然气化工省高校重点实验室,黑龙江大庆163318

出　　处：《高分子材料科学与工程》2023年第3期71-78,共8页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(52076036)。

摘　　要：为减少原油运输的能耗,结合大庆高蜡原油的特点,以偶氮二异丁腈(AIBN)为引发剂,采用溶液接枝方法将马来酸酐(MAH)接枝到乙烯-醋酸乙烯酯共聚物(EVA)上,制备出EVA-g-MAH(EVAM)聚合物降凝剂,探究了不同条件下合成的EVAM聚合物降凝剂对模拟油凝点和黏度的影响。研究结果表明,选用VA质量分数为33%的EVA,AIBN含量为单体质量的0.3%,m_(EVA):m_(MAH)=1:5,反应温度在60℃,反应时间为5.5 h时,模拟油凝点可以从34℃降至17℃,32℃时黏度由2399 mPa·s降至4.8 m Pa·s;20℃时,添加600 mg/kg EVAM的模拟油黏度仅为837.4 mPa·s,相较于添加相同剂量EVA(w_(VA)=33%)的模拟油黏度进一步降低了67.86%。结合偏光显微镜分析表明,EVAM降凝剂的添加干扰了模拟油中蜡晶的生长方向,进一步提高了蜡晶之间的分散性,使其不易形成三维网状结构,改善了模拟油在低温的时流动性。In order to reduce the energy consumption of crude oil transportation,combined with the characteristics of Daqing high-wax crude oil,azobisisobutyronitrile(AIBN)was used as initiator,maleic anhydride(MAH)was grafted onto ethylene-vinyl acetate copolymer(EVA)by chemical grafting method to prepare EVA-g-MAH(EVAM)polymer pour point depressants(PPDs).The effects of EVAM polymer PPDs synthesized under different conditions on the pour point and viscosity of the model oil were investigated.And by optimizing the reaction conditions,the changes of the model oil wax crystal morphology before and after the addition of additives were explored.The research results show that when EVA with the VA mass fraction of 33%is selected,the AIBN content is 0.3%of monomer mass,mEVA:mMAH=1:5,the reaction temperature is 60℃,and the reaction time is 5.5 h,the pour point of the model oil can be reduced from 34°C to 17°C,and the viscosity at 32°C can be reduced from 2399 mPa·s to 4.8 mPa·s,when doped with 600 mg/kg of EVAM at 21℃,the viscosity of the model oil was only 837.4 mPa·s,which is further reduced by 67.86%compared with the model oil with the same dose of EVA(wVA=33%).Combined with polarized light microscope analysis,it is shown that the addition of EVAM PPDs interferes with the growth direction of wax crystals in the model oil,further improves the dispersion between wax crystals,makes it difficult to form a three-dimensional network structure,and improves the flow of the model oil at low temperatures.

关 键 词：降凝剂 模拟油 接枝聚合 蜡晶形态 

分 类 号：TE832[石油与天然气工程—油气储运工程]