What are the factors that affect the mixing effect of the rubber mixing mill?

If you want to improve the quality of rubber mixing, you should be clear about the factors that affect the mixing effect of the rubber mixing mill and pay attention to these influencing factors in the production process.

Here is the content list:

•  Amount of glue loading

•  Top bolt pressure

•  Mixing temperature

•  Dosing order

•  Mixing time

Amount of glue loading

A reasonable amount of rubber should ensure that the rubber is subjected to maximum friction and shearing in the mixing chamber so that the compound is evenly dispersed. The size of glue loading depends on the characteristics of equipment and glue material. Generally, the calculation is based on the total volume of the refining chamber and the filling factor, which is 0.55 to 0.75. If the equipment is used for a long time, due to the wear and tear in the refining chamber, the filling factor can be taken as a large value, and the loading volume can be increased. If the pressure of the top bolt is larger or the plasticity of the rubber is larger, the filling volume can also be increased accordingly.

Top bolt pressure

Increase the pressure of the top bolt, not only can increase the loading capacity, but also can make the rubber and equipment and rubber between the internal parts of the faster and more effective mutual contact and extrusion, accelerating the mixing agent into the rubber process, to shorten the mixing time, improve production efficiency, but also reduce the material in the equipment contact surface sliding, increase the shear stress on the rubber, improve the dispersal of the compound, improve the quality of the rubber. Therefore, the current measures to increase the diameter of the top bolt wind cylinder or increase the wind pressure, to improve the mixing efficiency of the rubber mixing machine and mixing rubber quality.

Mixing temperature

Rubber mixing machine mixing process, heat generation, heat dissipation is difficult, so the rubber temperature rises quickly, high temperature. General by the refining temperature in 100 ~ 130 ℃ wamp around, but also using 170 ~ 1 90 ℃ high-temperature I Kun refining, this process has been used in synthetic rubber mixing, slow speed refining when the discharge temperature is generally controlled at 125 ~ 135 ℃, fast refining when the discharge temperature up to 160 ℃ above. Too high a temperature will reduce the mechanical shear of the rubber, so that the mixing is not uniform, and will intensify the thermal-oxidative cracking of rubber molecules, so that the physical and mechanical properties of the rubber are reduced, at the same time, it will also promote too much chemical combination between rubber and carbon black and generate too much gel so that the plasticity of the rubber is reduced, the surface of the rubber is rough, resulting in calendering, pressing out processing difficulties.

Dosing order

Plastic refining rubber and master refining rubber should be the first to be added, so that it forms a whole, and then add other matching agents in turn. Solid softeners and small drugs in the addition of carbon black and other fillers before adding to ensure that it has sufficient mixing time. Liquid softener must be added after the addition of carbon black, so as not to make carbon black agglomerates cause dispersion difficulties; super accelerator and sulfur yellow in the next piece of machine to add after cooling, or two mixings in the rubber mixing machine, but the discharge temperature should be controlled at 100 ℃ below.

Mixing time

Mixing time depends on the performance characteristics of the rubber mixing machine, the amount of loaded rubber and rubber formula, and other factors. Mixing: the post, time growth, can improve the dispersion of the compounding agent, but too long a time is likely to cause over-refining, but also affect the vulcanization characteristics of the rubber. At present, the mixing time of the XM-2 5 0 / 20 type rubber mixing machine is 10-12min.

Through the above introduction, you should already have a comprehensive understanding of the factors affecting the mixing effect of the rubber mixing mill. So you should pay extra attention to these factors in the production process and try to improve the mixing effect of the rubber mixing mill. If you are in the rubber mixing mill business, you can consider Qingdao Huicai Machine Manufacture Co., Ltd.'s cost-effective products.