成核剂对透明抗冲聚丙烯性能影响

Effect of Nucleating Agents on Properties of Transparent Impact Resistant Polypropylene

以中试SpheripolⅡ工艺装置制备透明抗冲聚丙烯(EP08T),以EP08T为基料,研究了3种透明成核剂Millad NX8000(NX8000)、Millad 3988(3988)和NA-21对EP08T的光学性能、力学性能以及结晶行为的影响。结果表明:随着成核剂添加量的增大,所得样品的光学性能、冲击强度以及结晶温度(T c)大幅提升,拉伸强度、弯曲强度以及弯曲模量略有改善,其中NX8000改善效果最佳。当NX8000添加量达到0.3%时,EP08T的光学性能以及冲击强度最好,NX8000-0.3的雾度可以降至12.8%,降幅超过60%,冲击强度可以达到24.6 kJ/m^(2),是EP08T的3.5倍。成核剂可以显著提高EP08T的T c,缩短成型周期。当成核剂添加量为0.3%时,NX8000、3988和NA-21可分别将EP08T的T c提高13.8、11.7和11.5℃,缩短样品的成型周期,提高加工效率。

Transparent impact resistant polypropylene(EP08T)was prepared by a pilot-scale SpheripolⅡprocess.Using EP08T as base material,the effects of three transparent nucleating agents Millad NX8000(NX8000),Millad 3988(3988)and NA-21 on the optical properties,mechanical properties and crystallization behavior of EP08T were studied.The results show that with the increase of the amount of nucleating agent,the optical properties,impact strength and crystallization temperature(T c)of the samples are greatly improved,and the tensile strength,flexural strength and flexural modulus are slightly improved,among which NX8000 has the best improvement effect.When the addition amount of NX8000 reaches 0.3%,the optical properties and impact strength of EP08T are the best.The haze of NX8000-0.3 can be reduced to 12.8%,with a decrease of more than 60%.The impact strength of NX8000-0.3 can reach 24.6 kJ/m^(2),which is 3.5 times that of EP08T.The nucleating agent of NX8000-0.3 can significantly increase the T c of EP08T and shorten the forming cycle.When the addition amount of nucleating agent is 0.3%,NX8000,3988 and NA-21 can increase the T c of EP08T by 13.8,11.7 and 11.5℃respectively,shorten forming cycle of the sample and improve the processing efficiency.