Page 56 - 《橡塑技术与装备》2019年2期（1月下半月塑料版）

橡塑技术与装备（塑料） CHINA RUBBER/PLASTICS TECHNOLOGY AND EQUIPMENT (PLASTICS)

[21] 高建龙 . 碳纳米管 / 聚合物复合材料电学性能研究 [D]. 兰州 ： [22] 陈祥宝，张宝艳，邢丽英 . 先进树脂基复合材料技术发展及应
兰州理工大学，2009. 用现状 [J]. 中国材料进展，2009, (06):2~12.

Study on properties of carbon nanotubes/epoxy resin composites

Quan Kaiyu

(Shaanxi Jintai Chlor-Alkali Chemical Co. LTD., Yulin 718100, Shaanxi, China)
Abstract: Carbon nanotubes/epoxy resin composites studied in this paper are widely studied in
conductive composites. In order to reduce the viscosity of the system and facilitate stirring and curing, 50%
(mass fraction) epoxy diluent 669 mixed with E44 epoxy resin is used as the matrix. The commonly used methyl
tetrahydrophthalic anhydride is chosen as curing agent, and DMP-30 is added as accelerator. The dispersing
method used in the experiment is ordinary agitation and ultrasonic dispersion. The experimental results show
that the addition of carbon nanotubes greatly increases the mechanical properties of the material. The
bending strength increases from 81.72 MPa to 130 MPa, increasing by about 60%. At the same time, carbon
nanotubes play a toughening role, and the toughness of the material is obviously improved. Comparing
the bending strength of the composites at different concentrations, it can be found that the concentration
change of carbon nanotubes has little effect on the overall bending strength of the composites. Scanning
electron microscopy photographs show that the dispersion of carbon nanotubes/epoxy resin composites
prepared in this experiment is not good, and carbon nanotubes show aggregation distribution. In terms of
electrical properties, due to the insufficient dispersion of carbon nanotubes, the conductivity of materials is
low. Impedance analysis shows that the percolation threshold is above 0.50% (mass fraction). In the case of
good dispersion of carbon nanotubes, the percolation threshold is generally less than 0.1% (mass fraction)
because of the high L/d of carbon nanotubes. In terms of dielectric properties, it is found that carbon
nanotubes can significantly increase the relative dielectric constant of materials at low frequencies.
Key words: bending strength; toughening effect; dispersion; electrical property; percolation threshold
(R-03)

镇海炼化透明 PP 使用国产添加剂
ZRCC transparent PP using domestic additives

记者日前从中石化镇海炼化公司 (ZRCC) 获悉，该公司今年采用自主研发的国产添加剂替代进口添加剂，已
成功生产出 240 t 合格的透明聚丙烯新产品 M26ETW，标志着该领域核心剂种国产化技术攻关取得重要突破。
该国产添加剂应用后，按 2018 年产量计算，每年可为企业降本增效约 600 万元。
据了解， 透明聚丙烯产品应用非常广泛。2014 年，镇海炼化首个透明聚丙烯高端产品 M26ETU 研发获得成
功，其熔指达到 26 g/10 min，突破了当时国产环管工艺聚丙烯设计无规共聚牌号的熔指上限，再加上良好的硬度、
刚性和透明度等，产品上市后即大受欢迎，成为镇海炼化效益最好的聚丙烯产品牌号，并逐渐打开了海外市场。
但由于此前生产该类聚丙烯产品所用的核心剂种均是从国外进口，导致成本较高。为打破技术垄断并进一步
挖潜增效，镇海炼化于今年初组成攻关团队，从透明聚丙烯配方体系入手，开展国产核心剂种的技术攻关。
攻关团队在众多国产透明成核剂中筛选出 6 种，分别和其他添加剂按不同比例调配，对耐高温、透明性、雾
度、弯曲模量等树脂性能指数进行反复试验，最终研发出数据稳定、又兼顾成本的透明聚丙烯专用国产添加剂配方，
并在生产装置进行工业化试用。
摘编自 “ 中国化工报 ”
(R-03)

2
·42· 第 45 卷 第 期