极性接枝对聚乙烯棚膜的电晕及涂覆性能影响  

Effect of Polar Monomers Grafting onto Polyethylene Agricultural Film on the Corona Treatment and Coating of Nanoparticles

作　　者：田雨川 周炳 朱美芳[2] 王洪学 Yuchuan Tian;Bing Zhou;Meifang Zhu;James H Wang(Sinopec Shanghai Research Institute of Petrochemical Technology Co.,Ltd.,Shanghai 201028,China;College of Materials Science and Engineering,Donghua University,Shanghai 200051,China)

机构地区：[1]中石化(上海)石油化工研究院有限公司,上海201208 [2]东华大学材料科学与工程学院,上海200051

出　　处：《高分子材料科学与工程》2023年第2期89-98,共10页Polymer Materials Science & Engineering

基　　金：国家重点研发计划(2016YFB0302500)。

摘　　要：传统聚烯烃棚膜在生产中电晕处理往往需要消耗大量电能,且表面极性功能持效期较短,不利于可持续发展。为解决以上问题,文中采用反应挤出技术路线,将2种不同的极性单体——马来酸二丁酯(DBM)和甲基丙烯酸羟乙酯(HEMA),接枝于茂金属线型低密度聚乙烯(mLLDPE)上,吹膜得到接枝改性聚乙烯膜,并通过电晕与涂覆纳米涂层进一步增强其表面极性,使其达到超亲水状态。通过不同的表征手段系统研究了电晕强度、单体种类及含量对接枝改性膜表面极性的影响,以及它们与纳米涂覆液之间的相互作用。由衰减全反射傅里叶变换红外光谱和X射线光电子能谱分析得知,电晕后薄膜表面产生了C=O,C—O极性基团,并且发生了碳链断裂;通过接触角测试证实,相比于未改性聚烯烃膜,接枝后改性聚烯烃膜的表面极性显著提高,达到相同接触角所需的电晕能耗大大降低;通过扫描电镜对纳米涂液涂覆后的改性聚烯烃膜表面形貌研究发现,极性单体DBM的接枝能够增强膜表面与超亲水纳米涂覆液之间的相互作用,从而大幅减少干燥过程中产生的涂层裂痕;最后,氙灯加速老化试验证实,接枝的DBM单体可以有效延缓涂覆膜的表面极性老化失效过程,延长改性涂覆膜的持效期。论文展示了接枝改性可提升高性能聚烯烃(HPO)棚膜的涂覆效果与功能持效期,有助于延长棚膜的使用寿命。In this research,a reactive extrusion approach was selected to graft two types of polar monomers onto a metallocene linear low density polyethylene(mLLDPE)to increase the surface polarity of the films,and the films were subsequently subjected to corona treatment and coating of nanoparticle emulsions.The surface properties and bonding behaviors of the modified polyethylene films were systematically studied.ATR-FTIR and XPS results indicate that the films have C=O and C—O functional groups on the surface after corona treatment,and C-C bond cleavage is observed on the film surface.Based on the contact angle results,the surface polarity of PE-g-DBM and PE-g-HEMA films is significantly improved after grafting the two types of polar monomers.SEM results indicate that the bonding between PE-g-DBM film surface and SiO_(2)/Al_(2)O_(3) nanoparticles is enhanced by grafting dibutyl maleate(DBM)monomer,and cracking of nano-coating during drying process is significantly reduced by grafting DBM onto polyethylene.It is also found that grafting DBM can effectively delay the aging process of the PE-g-DBM films during the acclerated aging tests,this contributes to extend the service life of high performance polyolefin greenhouse films.

关 键 词：反应挤出接枝改性聚烯烃 电晕 纳米涂覆 茂金属聚乙烯 紫外加速老化 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]