Determination method for physical and chemical properties of white carbon black:
The physical and chemical properties of white carbon black directly reflect the quality situation, so accurate measurement of different usage requirements is very important. At present, the indicators of various foreign manufacturers are not the same, but some recognized important indicators need to be measured by each comapany.

The most important indicators are: indicators that reflect its primary structure, such as particle size and dispersion, specific surface area; Indicators reflecting secondary structure, such as oil absorption value; Indicators reflecting its surface chemistry, such as the concentration of various hydroxyl groups on the surface.
1. Due to differences in generation conditions and particle growth, the particle size and distribution of white carbon black are not uniform. The commonly referred particle diameter only has statistical significance.
2. The determination of specific surface area is an indicator that reflects the size of the outer surface area of a powder material. For a porous powder material, its specific surface area is the sum of the surface area inside the pores and the outer surface area. Generally speaking, the particle size of powder materials is inversely proportional to their specific surface area, so the determination of specific surface area can qualitatively reflect the particle size of the powder. Due to the fact that not all industrial units are equipped with electron microscopes, the particle size of powders cannot be obtained, thus the determination of specific surface area has important practical application value.
3. The determination of surface hydroxyl groups on white carbon black involves silanol groups on its surface, and many applications of white carbon black are directly related to these groups. Therefore, quantitative determination of surface hydroxyl groups is crucial. The determined data of hydroxyl groups on the surface of white carbon black generally includes total hydroxyl groups, adjacent hydroxyl groups, isolated hydroxyl groups, etc. The latter two are bound to the surface of white carbon black in the form of Si OH, collectively referred to as bound hydroxyl groups; The total hydroxyl group refers to the sum of hydroxyl groups in water molecules adsorbed on the surface of white carbon black, which can be measured under different conditions.

The measurement conditions are:
1) The hydroxyl group measured directly from the white carbon black bag is the total hydroxyl group content;
2) The hydroxyl group determined after drying white carbon black at 110 ℃ for 3 hours is the bound hydroxyl group;
3) The hydroxyl group measured after drying white carbon black at 600 ℃ for 3 hours is the isolated hydroxyl group;
4) The difference between the hydroxyl group and the isolating group is the adjacent hydroxyl group.

The determination of secondary structure is generally believed abroad that the degree of secondary structure directly affects the reinforcement behavior of fillers, so the determination of secondary structure is also important. But so far, there is no good method for measuring it. Currently, there are two most widely used methods: one is to determine the apparent specific volume under compression; The second is to measure the oil absorption value.

In addition to white carbon black, there is also a type of weak reinforcing filler, also known as inert filler, which only has a small reinforcing effect on silicone rubber. They are generally not used alone in silicone rubber, but instead work with white carbon black to adjust the hardness of silicone rubber, improve the processability of the rubber material, and the oil and solvent resistance of the vulcanized rubber, reducing the cost of the rubber material. Common weak reinforcement agents include diatomaceous earth, quartz powder, zinc oxide, titanium dioxide, zirconium silicate, and calcium carbonate.

The end.

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