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Three pillars supporting the character of FRP water tank

Jun 04, 2020

1. Synthetic resin

Synthetic resin is the matrix material that determines the quality of the FRP water tank. The loose glass fibers are bonded into groups by it, which plays an important role in reporting stress. Therefore, the resin plays an important role in the strength of the quality of the FRP water tank, especially compression, bending, rotation, The shear strength is more obvious.


The resin content also has an effect on the performance of the FRP water tank. The resin content is usually 20%-35%, which is related to the molding method and the variety of reinforced materials. For example, the resin content is relatively low for winding and molding, while the resin content is slightly higher for hand lay-up molding. The resin content of the strength layer is slightly lower, usually between 25% and 40%; the resin content of the corrosion-resistant and impermeable layer is higher, and the glass content is usually over 50%. The resin content is lower than that of glass fiber. felt. When the fiberglass appearance felt is used as the reinforcing material, the resin-rich content can reach more than 85%.

FRP water tank

In addition, resin is the matrix material that determines the quality of the FRP water tank. It has an influence on the elastic modulus, heat resistance, electrical insulation, electromagnetic wave permeability, chemical resistance, weather resistance, and aging resistance of the FRP. For example, the chemical liquid erosion resistance and water resistance of FRP depends on the performance of the resin matrix. Usually unsaturated polyester resin 197# is better resistant to chemical corrosion, while 1289# is better resistant to water. Different examples and different grades of resin have different performances.

Second, glass fiber

Fiberglass is an important bearing department that determines the quality of FRP water tanks. It can not only improve the strength and elastic modulus of FRP, but also eliminate the compression deformation, improve the heat deformation temperature and low-temperature impact strength. For example, 306# polyester resin casting body, after participating in 50% glass fiber, the tensile strength can be improved from 50MPa to 200MPa, and the tensile modulus can be improved from 3.9GPa to 14GPa glass fiber felt

Third, the interface

The so-called interface is the interface between any two-phase matter.

The quality of the FRP water tank is not only related to the reinforcing materials and synthetic resins used, but also to a large extent also related to the quality of the interface between the fiber and the resin and the durability.

Disposal of the interface between fiber and resin of fiberglass water tank is very important

As we all know, glass fiber is a cylindrical glass, and its appearance is as smooth as glass, and the appearance is often firmly adsorbed by a thin film of water, which certainly affects the bonding performance of glass fiber and resin. In particular, in the course of drawing textiles, glass fibers are often coated with a layer of sizing agent in order to reach the goals of bundling, lubrication, and static elimination. This kind of sizing agent is mostly wax-like substances. Resin and glass fiber play a blocking role, hindering the bonding of the two. It can be seen that the performance of FRP is greatly affected.

The three basic factors (glass fiber, resin, interface) that determine the quality of the FRP water tank are not enough

If there is a problem on the interface, it is necessary to deal with the punishment. For example, the punishment agent is covered with a layer of glass fiber appearance, so that the glass fiber and resin can be firmly bonded together. This method is a very useful way to improve the quality of glass fiber reinforced plastic water tanks. Practice has proved that glass fiber and its fabrics not only improve the abrasion resistance, water resistance and electrical insulation performance of glass fiber, but also improve the strength of glass fiber reinforced plastic water tank, especially under the humid environment. The progress is more obvious