时效处理对BOPP膜关键性能指标的影响及其助剂迁移机制研究

Effect of Time-processing on Key Properties of BOPP Film and Study on Migration Mechanism of Additives

目的明确时效对BOPP包装膜关键性能的影响趋势和程度。方法将不同型号的BOPP包装膜在标准环境下储存,每隔1个月测定一次摩擦、热封、热收缩、光学和力学等关键性能。结果BOPP包装膜在生产之后需要一定时效以使其物理性能达到稳定状态,其时间大约为1个月,存储时间超过4个月,部分样品的力学性能和热封性能可能随着添加助剂的迁移和薄膜的老化而出现明显下降现象。结论由于润滑剂等功能助剂的扩散迁移,导致BOPP的结构和表面受到影响,导致其关键性能受到影响。综合来看,在BOPP包装膜稳定1个月的前提下,越早使用其综合性能越好。

The work aims to clarify the trend and extent of time-processing effects on the key properties of BOPP packaging films.Different types of BOPP packaging films were stored in a standard environment,and their key properties such as friction,heat sealing,thermal shrinkage and optical and mechanical properties were measured every other month.After the production of BOPP packaging film requires a certain aging treatment to make its physical properties reach a stable state,its time is about one month,storage time is more than 4 months,the mechanical properties and heat sealing properties of some samples may decrease significantly with the migration of additives and the aging of the film.Due to the diffusion and migration of functional additives such as lubricants,the structure and surface of BOPP are affected,leading to the effect on its key properties.Overall,on the premise that BOPP packaging film is stable for one month,the earlier it is used,the better its comprehensive performance is.