Carbon black manufacturer dispersant

The function of the dispersing agent is mainly to make the various polymers in the slurry firmly and better adsorbed on the surface of the high temperature resistant carbon black particles, thereby providing a more perfect dispersion effect. If the dispersant is not well adsorbed on the surface of the carbon black particles, the performance of the coating will be greatly compromised. Due to the difference in resin system, the structural difference of dispersant in carbon black manufacturers is not all the same or similar dispersing agents. The same effect will occur in the grinding of black black pulp. The most important thing is to find the most suitable one through experiments. . The percolation threshold is also different due to the difference in surface area or oil absorption of carbon black. Carbon blacks having a larger specific surface area or larger oil absorption have a significantly lower permeation threshold because they have a more wettable surface and better dispersibility. Carbon black, such as simple high-speed stirring, is difficult to disperse in water. Generally, it is easy to add a certain amount of dispersing agent suitable for carbon black, and it is made by grinding. Aqueous carbon black pulp is good, and a good dispersing agent and carbon black are selected. Model matching, improper selection, blackness, etc. have a big difference.

The larger the amount of the pigment carbon black is, the higher the density of the carbon black particles or the carbon black particle assembly in a dispersed state, and the smaller the average distance between the particles, the higher the probability of contact with each other, and the carbon black particles or carbon black particles are collected. The more conductive paths formed by the body. The greater the polarity of the blend of polymers of different polarities and carbon black, the greater the critical volume fraction of carbon black, which means that the conductivity of the system is reduced because the surface of the carbon black contains strong polar groups. The polarity of the matrix is large and the effect is enhanced. At this time, the strength is increased, but the aggregation of the conductive particles themselves is hindered, so that the conductivity is poor.

Increasing the carbon black content can improve the electrical conductivity of the coating, but after the carbon black content exceeds 25%, the coating has obvious cracking. Therefore, by uniformly mixing the filler, the conductive property of the coating can be improved. The conductivity of the composite coating after adding a certain amount of silicon carbide to the filler and the conductivity of the single carbon black filler, the addition of silicon carbide reduces the percolation threshold of the composite coating to 5%, and the coating of the mixed filler is at the carbon black content. After 10%, the resistivity change is slow, indicating that the carbon black content in the coating is 10% to obtain better conductivity. There are two kinds of carbon black density, one is the true density, which is determined by the element and structure (or crystal structure) constituting the carbon black. Unless otherwise specified, the density of carbon black refers to the true density; the other is Pour density or apparent density, which varies with the processing conditions of the carbon black, and needs to be measured frequently. The apparent density is mainly used to provide basis for engineering equipment and volume calculation of containers such as packaging, storage and transportation. The graphite layer of carbon black has a larger pitch than graphite and its density is smaller than that of graphite.