To extend the period of decomposition and property degradation of polybutylene adipate terephthalate (PBAT) mulching film for long-term use, PBAT was compounded with polyethylene mixture (LDPE: LLDPE = 15:85), calcium carbonate, and illite. PBAT mulching films were prepared using a blown film extrusion process with 80 mm diameter blowing die. To improve mechanical properties and processability of the film, crosslinking agent di-(t-butylperoxy isopropyl) benzene (BIBP) was added to PBAT compound and the effect of BIBP content on compatibility enhancement of PBAT and PE was investigated. Rheological measurements through dynamic oscillatory frequency sweep showed that the storage modulus of PBAT compound increased with the addition of BIBP and the slope of it decreased in the low frequency region because of crosslinking increase of PBAT and PE. Melt flow index of PBAT compounds decreased with increasing BIBP content. In the blown film extrusion process, the temperature of the heating zones in the extruder increased and the flow rate of the cooling air decreased with increasing content of BIBP. The highest output rate and a uniform surface morphology of mulching film were obtained because of a stable bubble with a tubular shape even at high extrusion speed with 800 ppm of BIBP. In addition, tensile strengths of both machine and transverse directions were the highest among all PBAT compounds. When the content of BIBP was higher than 800 ppm, the surface inhomogeneity of the film increased, resulting in decrease of the tensile strength in machine and transverse directions due to increased chemical cross-linking of PE and PBAT.

中文翻译：

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通过吹膜挤出工艺制备PBAT /聚乙烯共混覆盖膜

为了延长长期使用的聚己二酸对苯二甲酸丁二醇酯（PBAT）覆盖膜的分解和性能退化，将PBAT与聚乙烯混合物（LDPE：LLDPE = 15:85），碳酸钙和伊利石混合。使用吹膜挤出工艺和直径为80 mm的吹模制备PBAT覆盖膜。为了提高薄膜的机械性能和可加工性，交联剂di-（t将丁基丁基过氧异丙基）苯（BIBP）添加到PBAT化合物中，研究了BIBP含量对PBAT和PE相容性增强的影响。通过动态振荡频率扫描的流变学测量表明，随着BIBP的添加，PBAT化合物的储能模量增加，并且由于PBAT和PE的交联增加，其在低频区域的斜率降低。PBAT化合物的熔体流动指数随BIBP含量的增加而降低。在吹膜挤出工艺中，随着BIBP含量的增加，挤出机中加热区的温度升高，而冷却空气的流速降低。由于即使在具有800 ppm BIBP的高挤出速度下，管状的稳定气泡也能获得最高的输出速率和均匀的覆盖膜表面形貌。另外，在所有PBAT化合物中，纵向和横向的拉伸强度最高。当BIBP的含量高于800ppm时，由于PE和PBAT的化学交联增加，膜的表面不均匀性增加，导致在纵向和横向上的拉伸强度降低。