It is obvious that the greater the viscosity, the worse the wettability. Epoxy resin glue is very viscous, so it is difficult to wet glass fiber. You can try to add acetone to dilute it. It is recommended not to exceed 8%, otherwise it will affect the performance.
Epoxy resin glue may encounter the following problems when wetting glass fiber:
Surface tension: Epoxy resin has a relatively high surface tension, which makes it difficult to completely wet the fiber surface when it comes into contact with glass fiber. Surface tension makes it difficult for the resin to penetrate the fiber bundle, resulting in uneven or incomplete wetting.
Viscosity and viscosity: The high viscosity and viscosity of epoxy resin makes it difficult to flow and penetrate into the gaps between glass fibers. This may cause the resin to fail to fill the gaps between fiber bundles during the wetting process, resulting in poor wetting.
Surface treatment: There may be various treatment agents, grease or other contaminants on the surface of glass fiber, which may reduce the adhesion between epoxy resin and fiber, resulting in difficulty in wetting.
To overcome these problems, the following measures can be taken to improve the wettability of epoxy resin glue to glass fiber:
Surface treatment: Before impregnation, ensure that the surface of the glass fiber is clean and free of impurities. Appropriate cleaners and surface treatment agents, such as degreasers or detergents, can be used to remove surface grease and contaminants.
Use of wetting agents: Wetting agents can reduce the surface tension of epoxy resin and increase its contact angle with glass fiber, thereby promoting better impregnation. The selection of wetting agents should be based on the specific epoxy resin and glass fiber type.
Temperature control: Increasing the temperature of epoxy resin and glass fiber can reduce the viscosity and viscosity of the resin, which helps the resin better penetrate the gaps between fiber bundles. However, it should be noted that excessively high temperatures may cause the resin to cure prematurely, so appropriate temperature control is required according to the specific situation.
Coating technology: Using techniques such as coating or spraying can help to apply epoxy resin to glass fiber more evenly to improve the impregnation effect.
Note that experiments and adjustments may be required to find the best impregnation method and process parameters for specific applications and material combinations. Additionally, other types of resins or sizings may be more suitable for use with fiberglass, depending on the circumstances.