Carbon black rubber filler, it can significantly improve the stress, tensile strength, tear strength, hardness and many other properties. So as to improve the quality of rubber products. So we can also think that the performance characteristics of carbon black, to a large extent, can determine the quality of rubber. Data show that the reinforcing effect of carbon black on rubber is mainly related to the amount of carbon black, structure, particle size and oil content and surface activity. Carbon black manufacturers talk about the impact of carbon black particle size on rubber products.

Referring to the particle size of carbon black for rubber applications we have to mention a broken rate. Broken rate refers to the carbon black into the mixing process powder content score. The powder content also need to be controlled, usually carbon black particle size greater than 125μm called grain, less than 125μm called powder, powder content is too high will affect the rubber quality. We say that the lower the crushing rate of carbon black, the better. So what exactly affects the fragmentation rate? Carbon black manufacturers today to study this issue.

From the movement of Kerry in the conveying air flow, the particles have different air resistance due to the difference of their size and content, the particle's velocity and direction will change, causing the velocity and direction of particles to move Variations cause significant speed differences between particles, friction and collisions with each other. Even carbon black particles of the same size, mass, and shape move in different pipe positions and have different rates of fragmentation. Carbon black manufacturers tell you the reason is that some position in the pipeline axial velocity, mirror speed and circumferential velocity are different.

In addition, different types of carbon black, its own fragmentation rate will be different. A research department has done a similar experiment, the different types of carbon black in the same transport conditions for the experiment, the resulting total crushing rate is very different.

There is also the granular nature of carbon black. Carbon black particle packing density, crushing strength, particle size, particle shape and other factors on the carbon black will have a certain impact on the rate of fragmentation. Particle bulk density differences mainly come from different manufacturers of carbon black process. Carbon black to prevent the length of time will also affect the size of the bulk density, the longer the time, the absorption of water will increase the bulk density of carbon black, bulk density, the greater the transmission resistance, the more difficult delivery. For carbon black with high resistance, larger conveying pressure and more air will be used to increase conveying speed. The air volume increases, the feed gas mixture ratio will drop, reduce the delivery resistance, improve the delivery speed, will cause the increase of carbon black broken rate.

The crushing strength of carbon black, the crushing strength of carbon black particles under the same conveying distance, pipe layout and conveying parameters, the smaller the increment of crushing rate after conveying. In order to ensure the crushing rate of carbon black particles less than 5%, the crushing strength of carbon black particles should be greater than 25g for pneumatic conveying system with conveying distance greater than 100m. If the conveying distance is less than 100m, the crushing strength of carbon black particles is not Should be less than 22 ~ 24g.

Particle size distribution, its impact on the rate of fragmentation is mainly based on the size effect of strength. The measured value of the material strength usually varies with the size of the experimental particles. The smaller the particle size, the greater the value of its intensity, the less likely it is to break up during transport. Because the larger the particle, the more likely it is to contain defects and the more cracks are contained.

There is also a point to note is the hygroscopicity of carbon black, carbon black stored in the atmosphere for too long, then the transport of carbon black is more likely to clump, affecting the delivery capacity and the residual amount within the pipeline. In order to achieve normal delivery, it is necessary to improve the conveying speed, and increasing the speed will inevitably cause an increase of the crushing rate of the carbon black. In addition, when cleaning the pipeline involved in carbon black, too much cleaning will increase the rate of carbon black broken.

Pneumatic conveying system on the impact of carbon black crushing rate, including pipe length, conveying speed and conveying pressure of three issues. First of all, the length and arrangement of the conveying pipe determine the size of the conveying resistance and the probability of collision and friction between the carbon black particles and the pipe wall, which is one of the main factors that affect the crushing rate of the carbon black. Delivery pressure is another very important parameter in pneumatic conveying. The greater the difference between the initial pressure and the end pressure, the greater the pressure drop is, which results in a particularly large impact on the elbow at the end of the pipe, especially at the elbow, Great negative impact. At the same time on the pipe, especially the elbow wear is also detrimental. In addition, if the pressure fluctuation at each point on the pipe during pneumatic conveying is large, the increase of broken particles will also result. Of course, if the pressure set in the sending tank is too low, it will result in dilute phase delivery, which will not only increase the amount of air consumed, but will also result in a decrease in delivery capacity. So, the best choice when experimenting with an appropriate piece of data. The last is the conveying speed, carbon black conveying speed team crushing rate of a great influence. In general, the lower the conveying force, the better. In order to ensure the production efficiency, an optimal conveying speed can solve a great problem.