以丙烯酸为单体,叔丁基过氧化氢（TBHP）为引发剂,二甲苯为溶剂,对聚乙烯蜡进行接枝改性。结果表明,当m（引发剂）∶m（聚乙烯蜡）=0.5∶100,m（丙烯酸）∶m（聚乙烯蜡）=15∶100,m（二甲苯）∶m（聚乙烯蜡）=300∶100,反应温度为120℃,反应时间6 h的条件下,可制得酸值为14 mg KOH/g蜡的接枝改性蜡。红外光谱分析表明,在聚乙烯蜡分子中引入了羧基。对接枝蜡用复合乳化剂、相转化法进行剪切乳化,结果表明,改性后的聚乙烯蜡易乳化分散,m（OS15）∶m（改性蜡）=10∶100,乳化温度为90℃~95℃,连续剪切分散30 min~40min,可制得均一、稳定的接枝改性蜡乳液,乳液平均粒径为5.8μm。
Modified polyethylene wax（PE） was prepared with grafted reaction,monomer is acrylic acid,initiator is tert-butyl hydroperoxide（TBHP）,and solvent is xylene.The result shows the modified PE（MPE） with acid value is 14 mg KOH/g wax could be prepared,the conditions are： m（initiator）∶m（PE）=0.5∶100,m（monomer）∶m（PE）=15∶100,m（xylene）∶m（PE）=300∶100;reaction temperature,120 ℃;Reaction time,6 hours.IR spectrum shows that carboxyl group has been imported into the molecular of PE.Phase inversion and shearing were used in the emulsifying.Emulsifying experiment shows the grafted PE is easy to emulsify compare to the PE.Using combination emulsifiers of fatty alcohol polyoxyethylene ether（OS15）and sodium lauryl sulfate,m（OS15）∶m（MPE）=10∶100,and m（lauryl sulfate）∶m（MPE）=5∶100,90 ℃～95 ℃ of emulsifying temperature,continuously stirring for 30 min～40 min,steady modified PE emulsion can be prepared,average particle diameter of which is 5.8 μm.
参考文献
| [1] | Singh SK;Tambe SP;Samui AB;Raja VS;Kumar D .Maleic acid grafted low density polyethylene for thermally sprayable anticorrosive coatings[J].Progress in Organic Coatings: An International Review Journal,2006(1):20-26. |
| [2] | 李华阳 .聚乙烯蜡化学改性及乳化和双单体非均相接枝改性聚乙烯的研究[D].中国科学院成都有机化学研究所,2001. |
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