低MFR双峰HDPE标准试样的研制及应用

Development and application of low MFR bimodal HDPE standard sample

以低熔体流动速率(MFR)、相对分子质量分布呈双峰(简称双峰)的高密度聚乙烯(HDPE)100N粉料为原料,先用筛网除去大颗粒和微小粉末,再加入0.2%(w)抗氧剂1010和0.2%(w)抗氧剂168混匀造粒,并除去大、小粒子及异形粒子制备标准试样。对标准试样进行均匀性、稳定性检验,并进行了氧化诱导时间、熔点、结晶点、白度的稳定性实验,以及对标准试样进行了定值及统计允许区间值的确定。结果表明:低MFR双峰HDPE标准试样的MFR标称值为(0.226±0.007)g/10 min,标准试样MFR均匀、稳定。

High-density polyethylene(HDPE)100N powder with low melt flow rate(MFR)and a bimodal distribution of relative molecular mass was used as raw material,whose large particles and fine powders were first removed with a sieve.Subsequently,antioxidant 1010 and antioxidant 168 whose mass fraction were 0.2%respectively were added to it for blending and granulation to prepare standard sample with the removal of large,small,and irregular particles.Stability tests for oxidative induction time,melting point,crystallization point,and whiteness of samples were performed,along with determination of nominal values and statistical allowable range values for the samples.The results indicate that the nominal value of the low MFR bimodal HDPE standard sample is(0.226±0.007)g/10 min,demonstrating uniformity and stability of MFR of the samples.