作 者：
(娄立娟）;
(陈商涛）;
(王艳芳）;
(张凤波）;
(俞炜）;
(黄强）;
机构地区：
中国石油石油化工研究院,北京102206
出 处：
《石油化工》
2017年第6期678-684,共7页
摘 要：
采用流变学研究方法,围绕注塑制品尺寸稳定性的判定和控制问题,对四种典型高流动抗冲聚丙烯专用料试样进行应变、时间、频率、剪切速率和变温速率等流变学扫描测试,考察了加工温度、加工时间、注塑工艺中的升降温过程及加工剪切速率对相分离和收缩翘曲变形程度的影响。实验结果表明,施加应变范围控制在5%以内,以保证测试处于线性黏弹区的范围内,时温叠加测试为190~260℃;在实际注塑时,vGP曲线拐点处的复数模量(G*_T)小于110 Pa,注塑制品尺寸的稳定性较好;110 Pa800 Pa,注塑制品的稳定性较差;K9928和K7726H需要低加工温度和短加工时间,而K9928H和EP548R需要高加工温度;EP548R可采用增大外加流场的方式,来控制体系的相分离程度和产品最终的收缩翘曲变形程度。
The issue on the determination and control of dimensional stability for several specimens of high flow impact polypropylene（PP） by means of rheology was discussed,and the corresponding rheological judgment method was established based on the estimation of rheological testing conditions. The effect of the processing time,the shear rate and the heating and cooling process during injection molding on the degree of phase separation and warping deformation was also evaluated. The experiment results suggest that the dimensional stability of injecting product is good when G＊T at transition point on the v GP curve of PP melt is lower than 110 Pa,and it turns bad when G＊T〉800 Pa,also it is neither when G＊T lies between 110 Pa and 800 Pa. K9928 and K7726 H prefer the low processing temperature and short processing time,while high processing temperature is suitable for K9928 H and EP548 R. Moreover,the phase separation of EP548 R system and the final shrinkage and warpage of the injecting product can be controlled very well by means of increasing the external applied flow field.
关 键 词：
高流动抗冲聚丙烯
尺寸稳定性
收缩翘曲
流变学
控制
