LLDPE棚膜专用料DFDA-7047产品质量改进

针对线型低密度聚乙烯棚膜专用料DFDA-7047耐老化性能、抗撕裂性能及透光率较同类产品低的问题，对乙烯分压、反应温度、n（H2）／n（C2H4）、n（1-C4H8）／n（C2IL）进行了优化；利用凝胶渗透色谱仪、差示扫描量热仪和傅里叶变换红外光谱仪对DFDA一7047及国产同类专用树脂进行了结构剖析。分析结果表明：DFDA-7047的重均分子量比试样I和试样Ⅱ低，但结晶性能与试样I和试样Ⅱ相当，说明产品耐老化性能得到了改善；DFDA-7047的横向、纵向直角撕裂强度分别达到135，101N／mm，均比试样I高；DFDA-7047薄膜制品的雾度为15．6％，比试样I的雾度低1.8％，说明产品的光学性能得到提高。

The Quality Improvement of DFDA-7047 Made from LLDPE for Specialty Greenhouse Film

Because aging resistance, tearing strength and transmittance of the DFDA-7047 were under the similar other products,the ethylene partial pressure, reaction temperature, n（H2）/n（C2H4） and n（I-C4H8）/ n （C2H4） were optimized. The structure of DFDA-7047 and similar other special resin made from China analyzed with gel permeation chromatography, differential scanning calorimetry, Fourier transform infrared spectroscopy. The results showed that the DFDA-7047 Mw was lower than the others, the crystallization behavior was similar to the others. The results indicated the aging resistance improved. The DFDA-7047 of right angle tearing strength in horizontal and vertical was up to 135 N/mm, 101 N/mm respectively,above the others, the haze of 15.6% less than 1.8% of the other, the optical property modified.