GB/T 38396-2019 English PDF

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GB/T 38396-2019: Pitch products of coal carbonization - Determination of mesophase content - Microscopical analysis by reflected light
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 38396-2019	279	Add to Cart	3 days	Pitch products of coal carbonization - Determination of mesophase content - Microscopical analysis by reflected light	Valid

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Basic data

Standard ID: GB/T 38396-2019 (GB/T38396-2019)
Description (Translated English): Pitch products of coal carbonization - Determination of mesophase content - Microscopical analysis by reflected light
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G18
Classification of International Standard: 71.080
Word Count Estimation: 14,139
Date of Issue: 2019-12-31
Date of Implementation: 2020-07-01
Quoted Standard: GB/T 2000; GB/T 2294
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration
Summary: This standard specifies the terms and definitions, principles, reagents and materials, instruments, sample collection and preparation, analysis procedures, result reports, precision, etc. for the determination of mesophase content by light reflection microscopy. This standard is applicable to the determination of the content of mesophases such as modified asphalt, high softening point asphalt (superhard asphalt), mesophase pitch, and mesophase carbon microspheres.

GB/T 38396-2019: Pitch products of coal carbonization - Determination of mesophase content - Microscopical analysis by reflected light

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Coking pitch products-Determination of mesophase content-Light reflection microanalysis method) ICS 71.080 G18 National Standards of People's Republic of China Determination of mesophase content of coking asphalt products Light reflection microanalysis 2019-12-31 release 2020-07-01 implementation State Administration of Market Supervision Published by the National Standardization Administration

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard is proposed by China Iron and Steel Industry Association. This standard is under the jurisdiction of the National Coal Chemical Standardization Technical Committee (SAC/TC469). This standard was drafted. Baowu Charcoal Material Technology Co., Ltd., Beijing Oubotong Optical Technology Co., Ltd., Information Standard Research of Metallurgical Industry Academy. The main drafters of this standard. Du Yaping, Zhang Yanqiu, Qi Xiumei, Li Qianyi, Zheng Jingxu, Pi Xiaoyu, Zhang Guobin. Determination of mesophase content of coking asphalt products Light reflection microanalysis

1 Scope

This standard specifies the terms and definitions, principles, reagents and materials, instruments, and samples for the determination of mesophase content by light reflection microanalysis. Take and prepare, analyze steps, report results, precision, etc. This standard applies to mesophase contents such as modified asphalt, high softening point asphalt (super hard asphalt), mesophase asphalt, and mesocarbon microspheres. Determination.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 2000 Coking solid products sampling method GB/T 2294 Method for measuring the softening point of coking solid products

3 terms and definitions

The following terms and definitions apply to this document. 3.1 Isotropic phase Complex aromatic organic compounds composed of carbon and hydrogen are usually the main phase and the continuous phase. Isotropic phase is glassy at room temperature Glassy solid, inactive under polarized light, see Figure 1. 3.2 Mesophase An optically anisotropic liquid crystal-like carbonaceous phase formed from the matrix of the mother phase when the molecular size, shape, and distribution are favorable. Polarized light The image with extinction is shown in Figures 1 and 2. Note 1. The formation process of the mesophase follows the following rules. optically isotropic asphalt undergoes decomposition reaction at a certain temperature (usually at 350 ° C ~ 450 ° C). It should react with polycondensation to form a liquid crystal with a condensed fused ring aromatic structure as the main body. Under the action of surface tension, mesophase spheres (secondary QI) are formed. When the grown-up mesophase spheres are close to each other, the flat macromolecular layers in each sphere are inserted into each other and fused to form a mesophase compound sphere. When the ball When the surface tension is not maintained to increase its spherical shape, it deforms and disintegrates to form an anisotropic region of flow dynamics. As the mesophase content increases Add, and finally form a large fusion of mesophase. See Figure 3a) ~ Figure 3d). Note 2. Mesophase pellets are generated during the liquid phase carbonization process, with a diameter of several micrometers to tens of micrometers. They have the characteristics of easy graphitization (high crystallinity). The mesophase carbon microspheres were obtained by burning. ......

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