不同颜料浓度时添加高熔体流动速率PE-LLD的色母粒性能研究

Properties of Color Masterbatch Containing High Melt Flow Rate PE-LLD in Different Contents of Pigment

以高熔体流动速率的线形低密度聚乙烯(PE-LLD)与低密度聚乙烯(PE-LD)混合作为载体,不添加任何分散剂制成不同颜料浓度的蓝色母粒。研究了该体系的加工流变性能、母粒的着色性能以及分散性能,并与以低相对分子质量聚乙烯蜡作为分散剂的PE-LD色母粒进行了对比。结果表明,当颜料浓度为30%(质量分数,下同)时,以PE-LLD/PE-LD作为载体,不用添加任何分散剂,制品的力学性能和色彩性能都可达到使用要求;但当颜料浓度达到40%及以上时,以PE-LLD/PE-LD为载体和添加聚乙烯蜡2种加工方法都不能得到合格的制品。

A noval blue color masterbatch was prepared using a blend of PE-LD and high melt flow rate PE-LLD as the matrix containing no dispersant. The rheological, coloring and dispersion properties of the masterbatch were investigated, which was compared with the traditional masterbatch containing a low molecular weight polyethylene wax as a dispersant. It was found that the PE-LLD/PE-LD matrix with no dispersant could bear up to 30 % of blue pigment keeping good mechanical and coloring, and processing properties. However, when the content of pigment was 40 % or higher, neither novel nor traditional masterbatch could maintain a satisfactory performance.