Coupling agents increase the performance of composite ...

The optimization of mechanical properties plays a key role in the design and manufacture of composites. Even if it is possible to further improve individual components such as resins, fillers or fibers, there are limits to the influence of these components on the properties of the overall material. An alternative approach is to optimize the bond between the resin matrix and the reinforcing phase dispersed in it. A simple way to do this is to use additives that crosslink with the resin and at the same time form a stable bond to the filler or fiber. The structure of these coupling agents has to be adapted to the chemistry of the matrix and dispersed phase. 

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One example of this are the coupling agents of the BYK-C product family available from BYK. They form a strong bond between the resin and the reinforcing material, enabling more robust and durable materials. This also provides greater freedom for material design. The improved properties of composites can be crucial in bringing the cost/performance ratio of systems into the desired range. The use of coupling agents therefore offers both access to new technical solutions and cost savings.

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Coupling agents can be used for a wide range of systems, including epoxy, unsaturated polyester, vinyl ester and acrylate resins. They can be combined with various inorganic reinforcing materials such as quartz, aluminum hydroxide, glass fibers, and carbon fibers. They can also be used at various stages of processing, for example in the production of reinforcing materials (surface treatment of fillers and fibers), as part of the resin formulation (use as an additive in the resin) and in the composite production itself (e.g. as second sizing or directly before or during application). Coupling agents can therefore be used at various steps along the value chain. This includes market players as diverse as manufacturers of fillers and fibers, resin houses, and composite manufacturers. Companies can use the additives to gain competitive advantages over conventional systems on the market.

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