聚丙烯熔喷非织造布紫外光接枝丙烯酸

Graft Polymerization of Acrylic Acid onto Polypropylene Meltblown Nonwoven via UV Irradiation

为提高聚丙烯熔喷非织造布的亲水性能,本文以二苯甲酮(BP)为光引发剂,采用紫外光接枝改性技术将丙烯酸(AA)接枝到聚丙烯熔喷非织造布上,详细研究了紫外光辐照时间、单体浓度、引发剂浓度以及溶剂对接枝率(GP)的影响,采用红外光谱、X射线光电子能谱、扫描电镜对接枝产物进行了表征,对亲水改性非织造布进行了水接触角、润湿时间及吸液性能测试。结果表明,BP及AA浓度的增大均可使GP迅速增大,而后出现下降趋势,随辐照时间延长,GP先增大,之后变缓;极性溶剂有利于接枝反应的发生;当GP为280%左右时,水接触角从132°降低为68.75°,润湿时间缩短为14.5 s,GP超过178%时,试样可在2 h内达到平衡吸水率,显示出优异的亲水性能。

In order to increase hydrophilic property of polypropylene（ PP） meltblown nonwoven,acrylic acid（ AA）was successfully graft polymerized onto polypropylene meltblown nonwoven（ PP-g-AA） via UV irradiation technique with diphenyl ketone（ BP） as photo initiator. The effect of UV irradiation time,monomer and initiator concentration and solvent on grafting percent（ GP） was studied. The structure of PP-g-AA was characterized by FT-IR,XPS and SEM,and the water contact angle,wetting time and absorbency were all tested. The results indicate that the increase of BP or AA concentration can make the GP increase rapidly,then the GP decreases. With the UV irradiation time prolonging,the GP firstly increases and then becomes smooth. The polar solvent is benefit to graft polymerization. The water contact angle decreases from 132° to 68. 75° and the wetting time shortens to 14. 5 s when the GP is about 280%. The PP-g-AA sample can reach the equilibrium water absorption rate within 2 h when the GP is over 178%,showing excellent hydrophilicity.