GB/T 3780.24-2017 in English

GB/T 3780.24—2017 Standard Interpretation

1. Background and Significance of the Standard

GB/T 3780 series standards are authoritative specifications in the field of carbon black testing. This part (Part 24) is specifically for the determination of carbon black void volume. Void volume is an important physical property of carbon black, which directly affects its performance in applications such as rubber. The formulation of this standard fills the technical gap in the evaluation of carbon black structural properties and provides a unified test method for the industry.

2. Method framework for void volume determination

3. Experimental equipment and technical requirements

According to the standard, the main instruments include:

• Analytical balance: graduation value is $0.1\mathrm{mg}$.
• Oven: gravity convection type, temperature control range $(125 \pm 5)^{\circ}\mathrm{C}$.
• Void volume measuring instrument: divided into two types: static and dynamic, in line with the technical requirements of Appendix A and Appendix B.

4. Experimental steps and data processing

Sample preparation:Carbon black samples need to be dried in a $(125 \pm 5)^{\circ}\mathrm{C}$ oven for more than $1\mathrm{~h~}$ and cooled to room temperature for use.

Calibration and standardization:Use 6 existing standard samples for regression analysis to ensure the accuracy of the equipment measurement. If the regression value of the standard sample exceeds the expected range, recalibration is required.

5. Implementation suggestions

1. Choose the appropriate test method:Choose the static method or the dynamic method according to the research purpose. The former is suitable for precise measurement, and the latter is suitable for analyzing the relationship between pressure and volume.
2. Equipment calibration: Regularly calibrate the measurement system using physical standards (such as steel plungers) to ensure long-term stability.
3. Data recording and analysis: Record the parameter settings and results of each test in detail, and use regression models to verify the extrapolated values.

6. Standard application cases

For example, in rubber products, the void volume directly affects the dispersion and reinforcement effect of carbon black. Through the methods of this standard, the impact of different production processes on the structural properties of carbon black can be evaluated, thereby optimizing the formulation design.