As a silicone rubber filler precipitated silica is an alternative to fumed silica in silicone rubber compounds by reducing cost and process inefficiencies.
Silica filler for silicone rubber.
The compounds were prepared with variable mixing temperatures based on the mixing procedure commonly in use for silica filled nr systems.
Hdk optimizes processes and products across a wide range of applications and industries.
Hdk is ideal for adjusting the flow properties of liquids and giving powders optimum free flow properties.
Bound rubber is generally defined as the polymer chains that cannot be extracted from suspensions by a good solvent at room temperature.
In the present work two secondary fillers organoclay nanofiller and n134 carbon black were added to silica based natural rubber compounds at a proportion of silica secondary filler of 45 10 phr.
Provided is a hydrophilic precipitated silica which is well suited to use in silicone rubber formulations rtv 1 rtv 2 htv and lsr particularly well suited to use in htv silicone rubber formulations.
Trialkoxy silyl group builds stable siloxane bonds filler modifier rubber active group reacts with polymer during vulcanization and develops covalent filler rubber bonds.
Tires whether using a proven industry standard such as hi sil highly dispersible silica hds or game changing agilon performance silica global tire makers have relied on our reinforcing fillers for decades to redefine the boundaries of the industry s magic triangle from decreasing rolling resistance to improving treadwear and wet traction ppg s precipitated silica products.
Moreover an adsorption layer called bound rubber or immobilized layer filler gel is believed to form on silica aggregation eventually composes a reinforcement filler network.
Both chemical reactions have to be carefully controlled.
It has a bet surface area of 185 260 m 2 g a ctab surface area of 100 160 m 2 g a bet ctab ratio of 1 2 2 6 and a conductivity of 250 μs cm.
These bonds are responsible for the high reinforcing potential of the silica silane filler system.
The amount of the filler present in the compound has an impact on the bulk density which is why it is necessary to find the optimal value without sacrificing the inherent low density of the silicone rubber.
Hdk pyrogenic silica improves the performance stability and handling of your systems and formulations at all phases of production and processing.
In figure 1 the stress strain curves of a liquid silicone rubber are shown with different quantities of fillers.
Silicone rubbers are often one or two part polymers and may contain fillers to improve properties or reduce cost.
