AOS-AA表面活性剂的制备及在浮选法脱墨中的应用

Preparation of Anionic Copolymer Surfactant AOS-AA and Its Application in Flotation Deinking

关键词:  脱墨剂  α-烯烃磺酸钠；共聚物表面活性剂；白度；残余油墨量

Key Words:deinking agent  α-olefin sulfonate  copolymer surfactant  whiteness  residual ink concentration

摘要:采用水溶液聚合法,以α-烯烃磺酸钠(AOS)和丙烯酸(AA)为原料通过聚合反应制得阴离子共聚物AOS-AA表面活性剂,并将其作为脱墨剂用于废纸脱墨。考察其最佳合成工艺,并研究了该产品与非离子表面活性剂复配的脱墨效果。用红外光谱对所制备的表面活性剂进行分子结构表征,用凝胶色谱分析仪测得其相对分子质量及其分布,并通过扫描电镜对比其与复配脱墨剂及市售脱墨剂的脱墨效果。结果表明,当n(AOS)∶n(AA)=1∶2,引发剂用量为3.0%,聚合温度为85℃,聚合时间为5 h,合成的AOS-AA在pH值为8~9时,脱墨效果最佳；合成的AOS-AA与月桂醇聚氧乙烯醚（AEO-9）进行复配,当m(AOS-AA)∶m(AEO-9)=1∶2,其总用量为0.2%(其他助剂一定)时,旧杂志纸脱墨后白度达72.1%,残余油墨量仅为41.4 mm²/m²。

Abstract:Anionic copolymer surfactant AOS-AA was synthesized by aqueous solution polymerization using sodium α-olefin sulfonate (AOS) and acrylic acid (AA) as raw material. The synthesis process was optimized, and the combined deinking performance of the copolymer surfactant AOS-AA and nonionic surfactants was investigated. The structure of the anionic copolymer was characterized by FT-IR, the relative molecular mass and its distribution of the product were measured by GPC and the deinking efficiencies of the anionic copolymer alone, the mixed deinking agent and commercial deinking agent were compared by SEM. It was found that the best deinking effect could be obtained when the preparation conditions of the product was as follows: n(AOS)∶n(AA)=1∶2, w(APS)=3.0%, reaction temperature 85℃, reaction time 5 h and pH value of the polymer 8～9. When the mixed deinking agent of m(AOS-AA)∶m(AEO-9)=1∶2 and with dosage 0.2%; the whiteness of the deinked OMG could reach to 72.1% and the residual ink concentration was only 41.4 mm²/m².