The function and effectiveness of coupling agents

In practice, it has been found that the performance of fiberglass is largely determined by the bonding condition between the reinforcing material and the synthetic resin interface. Therefore, the interaction between coupling agents and fiberglass and resin has attracted widespread attention.

When glass fibers are immersed in a treatment solution containing coupling agents, the formulation will generally be adsorbed onto the glass surface within 30-60 seconds. After a certain drying process, a film is formed. This type of film is mostly not firmly bonded to glass and can be removed by water or organic solutions. Only a small amount of treatment agent is firmly bonded to glass. It is usually smaller than a single molecular layer but can firmly bond with coupling agents to change the interfacial adhesion properties.

At present, the most commonly used explanation for the role of coupling agents is theory, also known as chemical bond theory. This theory suggests that in terms of chemical structure, the molecules of coupling agents generally contain two types of functional groups with different properties. Some functional groups, such as alkoxyl groups, react with MOH on the surface of inorganic materials to form chemical bonds; And another part of the functional groups, such as vinyl, can react chemically with the resin to form chemical bonds. In this way, through the action of coupling agents, inorganic materials and synthetic resins with these two properties are "coupled" through chemical bond bridges, achieving good adhesion and effectively resisting the erosion of harmful substances such as water.