改性CA-CP抑菌薄膜的制备与性能表征

以低密度聚乙烯(LDPE)为基材,丙酸钙(CP)和改性抑菌树脂(CA)为添加剂,通过共混、挤出-吹塑工艺制备改性CA-CP抑菌薄膜。研究了CP浓度为0,0.8%,1.8%,2.8%和3.8%对改性抑菌薄膜抑菌性能,力学、光学性能,透气、透湿性能,微观形态及红外图谱的影响。结果表明,CP的添加,提高了改性CA-CP抑菌薄膜的雾度、阻隔性及抑菌性,降低了薄膜的透光率。当CP含量≥2.8%,改性CA抑菌树脂含量为0.2%时,薄膜的阻隔性能和抑菌性能较好,可以作为一种活性包装材料,应用到食品的抑菌保鲜中,延长食品货架期。

Preparation and characterization of modified CA-CP antibacterial film

Modified CA-CP antibacterial film was prepared by blending, extrusion-blow molding process with low density polyethylene (LDPE) as substrate, calcium propionate (CP) and modified antibacterial resin (CA) as additives. The effects of CP concentration of 0%, 0.8%, 1.8%, 2.8% and 3.8% on the antibacterial properties, mechanical and optical properties, breathability, moisture permeability, micro morphology and infrared spectra of the modified antibacterial film were investigated. The results showed that the addition of CP increased the haze, barrier and bacteriostasis of the modified CA-CP antibacterial film, and decreased the transmittance of the film. When the content of CP was ≥ 2.8% and the content of modified LDPE antibacterial resin was 0.2%, the barrier property and antibacterial property of the film were better. It can be used as an active packaging material and applied to the antibacterial preservation of food, prolonging food shelf life.