黏结剂沥青的氧化-轻度聚合两步法制备及成焦性研究

Preparation and coking properties of binder pitch prepared by oxidation and mild-polymerization two step method

  • 摘要: 黏结剂沥青是人造炭素/石墨电极的重要原料之一,高品质黏结剂沥青的制备意义重大。本研究将四种不同来源的高温煤焦油沥青进行净化处理得到的精制沥青为原料,通过空气氧化-轻度热聚合两步法制备了四种黏结剂沥青,并对黏结剂沥青的成焦性进行了研究。通过工业分析、元素分析、FT-IR、光学显微镜和热重分析仪对黏结剂沥青的基础物性进行了研究,并利用光学显微镜、XRD、Raman光谱、扫描电子显微镜(SEM)和显微强度对黏结剂沥青焦的微观结构进行了表征。结果表明,四种净化高温煤焦油沥青经氧化-轻度聚合两步法均可制备出光学各向同性,芳香性指数较高,热稳定性较好的黏结剂沥青,将其进行热转化和炭化后,得到的黏结剂沥青焦的光学显微结构以片状为主且趋于规整炭微晶含量相对较高。其中,黏结剂BP-KL的β树脂含量高达35.27%,将其热转化和炭化后的沥青焦光学各向异性指数高达93%。

     

    Abstract: Binder pitch is one of the important raw materials for artificial carbon/graphite electrodes, and the preparation of high-quality binder pitch is of great significance. Four kinds of refined pitches which prepared by high-temperature coal tar pitch with different sources were used as raw materials to produce binder pitches by oxidation and mild-polymerization two step methods. And the coking properties of the binder pitch were also studied in detail. The basic physic-chemical properties of binder pitch were studied by proximate analysis, ultimate analysis, FT-IR, optical microscope and thermogravimetric analyzer, respectively. Well, optical microscope, XRD, Raman spectrum, scanning electron microscope(SEM) and micro-strength were also used to determine micro-structure of binder pitch coke. The results shows that, the binder pitches with optically isotropic, high aromatic and good thermal stability were prepared by four types of refined high-temperature coal tar pitch through a two-step process of oxidation and mild-polymerization method. The optical micro-structure of binder pitch cokes obtained by thermal conversion and carbonization method were mainly composed of leaflet structure and had a relatively high content of regular carbon microcrystals. Among them, the content of β resin in binder pitch BP-KL was as high as 35.27%, and the optical anisotropy index of the binder pitch coke was as high as 93%.

     

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