What is the national standard for carbon black for rubber?
Rubber is an important industrial material widely used in automobile manufacturing, construction, medical treatment, electronics and other fields. The quality of rubber depends largely on the type and content of additives. Carbon black is one of the most important rubber additives, its main function is to enhance the hardness, strength, wear resistance and weather resistance of rubber. Therefore, the national standard of carbon black for rubber is of great significance to ensure the quality and safety of rubber products.
At present, my country's national standard for carbon black for rubber is GB/T 3778-2011 "Carbon Black for Rubber". This standard stipulates the classification, technical requirements, test methods, packaging, transportation and storage of carbon black, etc. Next, we introduce the main content of this standard in detail.
1. Classification of carbon black
According to different production processes and uses, carbon black can be divided into many different types. GB/T 3778-2011 standard divides carbon black into the following five categories:
1. N-type carbon black: It is a carbon black with small surface area, loose structure and large particle size. Its main use is as a filler for rubber products.
2. S-type carbon black: It is a carbon black with large surface area, compact structure and small particle size. Its main use is as a reinforcing agent for rubber products.
3. F-type carbon black: It is a carbon black with large surface area, loose structure and small particle size. Its main use is as a filler for wires and cables.
4. P-type carbon black: It is a carbon black with small surface area, loose structure and large particle size. Its main use is as an additive for asphalt.
5. G-type carbon black: It is a carbon black with large surface area, compact structure and small particle size. Its main use is as a filler for printing ink.
2. Technical requirements of carbon black
The GB/T 3778-2011 standard specifies the technical requirements for carbon black, including the following aspects:
1. Appearance requirements: carbon black should be black powder or granular, without obvious impurities and agglomerates.
2. Chemical composition: Carbon black should meet the chemical composition requirements stipulated in the standard, including solid content, volatile matter content, ash content, pH value and other indicators.
3. Physical properties: Carbon black should meet the physical property requirements specified in the standard, including specific surface area, structure index, particle size distribution, oil absorption value and other indicators.
4. Thermal stability: Carbon black should have good thermal stability and should not appear obvious discoloration or deterioration.
5. Packaging, storage and transportation requirements: Carbon black should be packaged, stored and transported in accordance with standard requirements to ensure its quality and safety.
3. Test method of carbon black
The GB/T 3778-2011 standard specifies the test methods for carbon black, including the following aspects:
1. Appearance inspection: the appearance of carbon black is mainly inspected by means of visual inspection and hand feeling.
2. Chemical composition detection: mainly through chemical analysis and other methods to detect the chemical composition of carbon black.
3. Physical property detection: mainly through the measurement of specific surface area, structure index measurement, particle size distribution measurement, oil absorption value measurement and other methods to detect the physical properties of carbon black.
4. Thermal stability detection: mainly through heating, constant temperature, cooling and other methods to detect the thermal stability of carbon black.
4. Application of carbon black
Carbon black is an important rubber additive widely used in tires, belts, seals, pipes, wires and cables and other rubber products. The application of carbon black can improve the hardness, strength, wear resistance and weather resistance of rubber products, and improve their service life and safety.
In short, the national standard GB/T 3778-2011 for carbon black used in rubber is an important basis for ensuring the quality and safety of rubber products. Understanding and complying with this standard is of great significance to rubber manufacturers, rubber product manufacturers and consumers.