Overcoming the problem of mixing silicone rubber with fillers, empowering high-end applications in multiple fields

Silicone rubber has become a core material in high-end fields such as aerospace, automotive, electronic and electrical, medical and health due to its excellent high and low temperature resistance, weather resistance, electrical insulation, and physiological inertness. In order to further optimize the mechanical strength, wear resistance, thermal conductivity and other properties of silicone rubber, the industry generally adopts the process of adding fillers such as white carbon black, ceramic powder, carbon black, etc. However, the high viscosity of silicone rubber and the easy agglomeration of fillers make the uniform mixing of the two a common problem in the industry. The SMIDA planetary centrifugal mixer relies on a unique "revolution+rotation" composite motion structure, combined with an efficient vacuum degassing system, to accurately solve pain points such as uneven dispersion and residual bubbles during the mixing process of silicone rubber and fillers, providing core guarantees for the production of high-quality silicone rubber products.
In the traditional process of mixing silicone rubber with fillers, there are many common and difficult problems. Firstly, the hydroxyl groups on the surface of fillers (such as white carbon black) are prone to form hydrogen bonds with the raw rubber, resulting in poor wettability, difficult dispersion, and even structural hardening of the rubber material; Secondly, insufficient mixing can easily cause the filler to aggregate and form a secondary structure, which not only fails to provide reinforcement but also leads to uneven mechanical properties of the product; Thirdly, high viscosity silicone rubber is prone to air entrapment during the mixing process. If the bubbles formed are not removed in a timely manner, it can lead to surface defects and sealing failure in the finished product. These problems seriously restrict the application of silicone rubber products in high-end fields, and there is an urgent need for professional mixing equipment to break through the bottleneck.
The SMIDA planetary centrifugal mixer has achieved precise upgrades in the mixing of silicone rubber and fillers from a technical perspective. The dual power mode of "revolution+rotation" at the core of the equipment enables the mixing head to rotate at high speed while revolving around the central axis, forming a strong shear flow field and centrifugal force field inside the mixing chamber. This composite motion enables high viscosity silicone rubber and fillers to achieve 360 ° all-round rolling and rubbing, effectively breaking the agglomeration structure of fillers, promoting full infiltration and uniform dispersion of filler particles and silicone rubber matrix, avoiding rubber material structuring, and ensuring the stability of mechanical properties of products. In response to the bubble problem, the high-precision vacuum pump system equipped on the equipment can maintain a stable high vacuum environment throughout the mixing process. Under the dual action of centrifugal force and negative pressure, small bubbles in the mixed system are quickly captured and completely discharged, ensuring the density of silicone rubber products from the source and eliminating surface defects.
Relying on its excellent mixing performance, SMIDA planetary centrifugal mixers can be widely adapted to various types of silicone rubber fillers such as high temperature vulcanization (HCR), room temperature vulcanization (RTV), and liquid silicone rubber (LSR), covering a wide range of application scenarios from seals in the aerospace industry, packaging materials in the electronics industry, to seals in the automotive industry, consumables in the medical field, and more. The equipment can flexibly adjust parameters such as revolution/rotation speed and vacuum degree according to the viscosity of silicone rubber, filler type and ratio, taking into account laboratory trials and industrial mass production, greatly improving production efficiency and product batch consistency.