Internal structure description and repair method of glass fiber reinforced plastic tank

FRP wall strength of the surface and inner layers, secondary and outer surfaces. These indicate that the layer also has a lot of fine structure, but the internal structure is not a lot of people know, Xiaobian then we introduce these internal structure.

1. FRP tank lining
FRP tank lining layer from the inner surface layer and secondary layer composition, the substrate should be used bisphenol A unsaturated polyester resin, vinyl ester resin and other excellent corrosion resistance of the resin. Reinforcing materials for the glass fiber surface felt, glass fiber chopped strand mat and glass fiber twist roving and so on.

2. FRP tank strength layer
From the general-purpose unsaturated polyester resin as the matrix, glass fiber twist roving as a reinforcing material. The resin content is from 45% to 50% and the thickness of the layer is determined by design calculations.

3. FRP tank outer surface layer
(Thickness less than 0.16 mm) is used as the reinforcing material, the resin content is more than 55%, and the thickness of the layer is 0.2-0.5mm. The unsaturated polyester resin with excellent weathering performance is used as the matrix, the glass fiber surface felt or the glass fiber twist roving (thickness less than 0.16mm)

4. FRP tank penetration phenomenon
In the design, first of all to the use of all glass steel tank (tank) or FRP veneer selection. Permeability is a function of fluid mass and infiltration pathways. Because water and some liquid with a small molecular mass have a faster flow rate in glass fiber mat (eg, water molecular weight is 18, molecular weight is 98, 5.4 times of water ), The temperature difference between the two sides of the lining is one of the active power.
Reduce the permeability and thermal expansion coefficient is to improve the stability of FRP lining, to avoid the veneer stripping, breaking the important content.
The modest packaging of glass fiber reinforced plastic in the manufacture of resins is an effective measure to enhance the stability of the village because the increase in packaging speed can reduce water activity, reduce the permeability and reduce the coefficient of thermal expansion, thermal stability and progressive lining Repair, but also can repair the effect of double-edged sword.

Repair of FRP
Although the performance of FRP, hardness, corrosion are good, but also because of this reason, resulting in glass fiber reinforced plastic tank leakage, and glass fiber damage, most of the case to replace the main repair is difficult, usually with glue Sticky or hot welding method to restore it, here a brief description of the adhesive method of repair.

(1) to clean the FRP. First of all, the first damage to the tank removed, clean and dry, do the premise of repair work.

(2) according to the size of the broken parts of the appropriate large glass fiber cloth, after baking in addition to wax, heated to not smoke so far, pay attention not to fold.

(3) with plastic. There are many kinds of liquid formulations, but under normal circumstances, is the epoxy resin and polyamide resin resin by 1: 1 ratio into a wide mouth container, stir with a stick and stir well, the viscosity is generally Mention the stick is not drawing as well, pay attention to the principle of Ning less do not, do not deserve too much, to just run out as well, followed by uneven mixing, with a good glue over a period of time will self-curing, Causing waste.

(4) glue. First with a hard brush to glue a layer of molten glass in the inner surface of the glass, and then put the glass cloth on the glue surface, gently pat pressure to make it close to the glue penetration of glass cloth; Infiltration and then coated with a second layer of glue, paste the second layer of glass cloth. The So the cycle, coated with a few layers on it, pay attention to the installation do not get too thick when installed.

(5) curing. After finishing the paint to find a place where the higher temperature so that natural curing, although the need for a long time, but absolutely can not use open flame baking. After its natural curing, and then polished corners, openings, paint, repair is completed, glass steel cans and restore the rugged.