Application of alkane coupling agent in glass fiber reinforced composites

Silane coupling agent is usually used to pretreat the surface of glass fiber in the glass fiber industry. The glass fiber reinforced composites pretreated with silane coupling agent have greatly improved their mechanical and electrical properties in both wet and dry states due to the special role of silane coupling agent. All thermosetting and thermoplastic resins can be reinforced with glass fibers pretreated with silane coupling agents, and silane coupling agents also have a great impact on the properties of the reinforced composites. The role of silane coupling agent in glass fiber reinforced composites, its influence on properties and its application in thermosetting and thermoplastic resins will be described in detail below.

3.1 role of silane coupling agent in glass fiber reinforced composites

After the silane coupling agent treatment, the stiffness of the glass fiber is improved, and the cutting property of the glass fiber is also significantly improved. At the same time, the defects (mainly microcracks) formed in the drawing process of the glass fiber can be eliminated, so as to improve the integrity of the surface of the glass fiber, protect the fiber, prevent the fiber from being damaged in the drawing process, and improve the tensile strength of the glass fiber itself. However, the role of silane coupling agent in glass fiber reinforced composites is mainly reflected in improving the adhesion between glass fiber and resin and preventing moisture from invading the surface of resin and glass fiber. After silane treatment of glass fiber, on the one hand, it can form a covalent bond molecular layer with the surface of glass fiber, and this molecular layer can maximize

Prevent moisture intrusion; On the other hand, the Y group of silane coupling agent can react with the resin and play a coupling role, so it can improve the adhesion between glass fiber and resin, greatly improve various mechanical properties of glass fiber reinforced composites, effectively reduce the degradation of adhesion caused by water intrusion, and maintain or significantly improve the wet mechanical properties of composites. It is obvious from the figure that under wet conditions, Silane coupling agent can effectively improve the adhesion between glass fiber and polymer. When the composite is exposed to humid environment, water will invade the interface between glass fiber and resin matrix. The invasion of water will reduce the strength of the resin matrix and the resin

The bond between the matrix and the interface breaks, and eventually the mechanical and electrical properties of the composite are greatly reduced. However, the mechanical and electrical properties of the composite have been greatly improved after the glass fiber is treated with silane coupling agent.