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Silane Coupling Agents: Techno Brief

Coupling agents are adhesion promoters that are used to provide a stable bond by reducing the interfacial tension between the fibrous or particulate inorganic component and the organic matrix polymer in reinforced and filled plastics. This Coupling Agents guide is designed to help you understand more about the use of silanes as coupling agents in reinforced plastics, focusing on the benefits and main applications.

Silane Coupling Agent Benefits

Inclusion of a silane coupling agent in a composite formulation results in a number of benefits which ultimately translate into lower costs through use of less material or, in many cases uses of a lower-priced material.

Different benefits of silane coupling agents are mentioned below

Durability in Wet Environment

Improve Durability with Silanes
The most destructive force in adhesion is migration of water to the hydrophilic surface of the inorganic reinforcement and attack of water at the interface to destroy the adhesive bond. A 'true' Coupling agent provides a water-resistant bond between the inorganic and organic materials. Silane coupling agents have the unique chemical and physical properties to not only enhance bond strength, but also more importantly, prevent de-bonding at the interface during aging, and use, of the composite.

Figure 1 shows that retention of flexural strength is much better with silane coupling agents than with the chrome complex (blue line).


Figure 1: Retention of flexural strength in wet environment with the use of different coupling agents

Better Mechanical properties

  

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