螺杆组合对聚乙烯接枝马来酸酐性能的影响研究  

Study on effects of screw combination on properties of polyethylene grafted maleic anhydride

作　　者：李煦田 汪加胜 唐舫成 温海军 何闯 Li Xutian;Wang Jiasheng;Tang Fangcheng;Wen Haijun;He Chuang(Guangzhou Lushan New Material Co.,Ltd.,Guangzhou 510530,Guangdong,China)

机构地区：[1]广州鹿山新材料股份有限公司,广东广州510530

出　　处：《中国胶粘剂》2022年第11期33-38,共6页China Adhesives

基　　金：广州市黄埔区科技计划项目(2021GH09)。

摘　　要：使用不同螺杆组合的双螺杆挤出机,熔融接枝制备了一系列不同相对接枝率(范围从0.17%~0.39%)和熔融指数(0.5~3.6 g/10 min)的聚乙烯接枝马来酸酐(PE-g-MAH)。将PE-g-MAH与未改性的聚乙烯及抗氧剂混合,制备了相同PE-g-MAH含量的黏合树脂。通过红外光谱、晶点数量、接枝率、热、力学性能测试等手段对不同螺杆组合的接枝产物进行表征和测定,还通过制备多层复合片材测定其性能。研究结果表明:错位角越小的捏合块螺杆元件对物料的输送能力越强,物料的停留时间越短;4组不同螺杆组合均可将马来酸酐接枝到聚乙烯上,随着剪切强度和分散能力增强,停留时间延长,接枝物晶点数量减少,接枝率由0.17%提高到0.39%,熔融指数由0.5 g/10 min上升到3.6 g/10 min;随着剪切强度增强,接枝物氧化诱导期缩短,力学强度降低,断裂伸长率升高,同时颜色变黄;接枝率提高可增强接枝物在粘接树脂中对乙烯-乙烯醇共聚物(EVOH)和PE的粘接强度,在相同接枝率条件下,接枝物结构破坏越严重,粘接树脂的粘接强度越弱。A series of polyethylene grafted maleic anhydride(PE-g-MAH)with different relative grafting ratios(range from 0.17% to 0.39%)and melt indices(0.5 to 3.6 g/10 min)were prepared by melt grafting using twin-screw extruder with different screw combinations. The bonding resin with the same content of PE-g-MAH was prepared by mixing PE-g-MAH with unmodified polyethylene and antioxidant. The grafted products of different screw combinations were characterized and measured by means of infrared spectroscopy,number of crystal points,grafting ratio,thermal and mechanical properties,and their properties were also measured by preparing multilayer composite sheets. The research results showed that the smaller the dislocation angle was,the stronger the conveying capacity of kneading block screw element was,and the shorter the retention time of the material was. Maleic anhydride could be grafted onto polyethylene by four groups of different screw combinations. With the increase of shear strength and dispersion ability,the retention time increased,the number of crystal points of the grafted products decreased,the grafting ratio increased from 0.17% to 0.39%,and the melt index increased from0.5 g/10 min to 3.6 g/10 min. With the increase of shear strength,the oxidation induction period of the grafted products shortened,the mechanical strength decreased,the elongation at break increased,and the color turned yellow. The increase of grafting ratio could enhance the bonding strength of the grafted products to ethylene-vinyl alcohol copolymer(EVOH)and PE in the bonding resin. Under the same grafting ratio,the more serious the structural damage of the grafted products was,the weaker the bonding strength of the bonding resin was.

关 键 词：聚乙烯接枝马来酸酐 EVOH 粘接性能 复合膜 

分 类 号：TQ436[化学工程]