The repair method of FRP must be given according to the specific situation of FRP damage.The following introduces several kinds of FRP after long-term use of common problems and repair methods.
Repair of internal corrosion of FRP lining
Clean the corroded parts, remove the corroded material, shovel to the weak strength of the FRP parts around, exposing the true color of FRP, and then thoroughly clean, and then dry, with angular grinder to grind the corroded parts.If has penetrated the substrate, should repair the substrate first.Then according to the FRP lining construction process layer lining and paste, and should be lapped with the surrounding 5cm or so.
Full corrosion repair of FRP lining
Thorough knock off, remove the corrosion, the substrate for the necessary treatment.If has penetrated the base material, should repair the base material beforehand.Then choose the appropriate corrosion resistant resin, fiber, filler and curing system (such as fluorine medium need to use polyester or polypropylene and other organic fiber), and then in accordance with the FRP lining construction process to re-construction, and strictly comply with the maintenance and curing procedures.
Repair of large area FRP lining peeling
After beating off, re-conduct the "broad substrate treatment", until qualified to brush the bottom coat, choose the bottom coat with low viscosity, high polarity and good cohesiveness, and select the special bottom coat when necessary.The FRP lining layer is not recommended to be too thick and should be less than 6mm.Increase the use of inorganic fillers.For large areas of falling off, it is necessary to reconsider the feasibility of the FRP lining scheme. The equipment FRP lining is not suitable for the use of the negative pressure is too high, FRP fiber reinforced plastic is not suitable for frequent large temperature sudden change environment, is not suitable for frequent large external stress and strain environment.
FRP lining shrinkage leads to hump, peeling repair
Cause analysis too much diluent added, no adhesive material, disposable lining area is too large, phenolic resin water content is too high.In the face of such problems, it is recommended to do it again.Strictly mix ratio, control adhesive viscosity, each time the lining construction area is controlled within 4㎡, prohibit a layer thickness of more than 6mm.