Containing The Defective Pipeline Composite Repair Technology

Highly effective composite pipeline reinforcement system containing fast-curing adhesive , composite wrap materials and process was investigated in this thesis . At first, the acrylic liquid rubbers containing pendant epoxy groups were synthesized by solution polymerization . Then the acrylic liquid rubbers were used to reduce the brittleness of bisphenol A diglycidyl ether epoxy resins cured with triethanlamide and diehylene triamine glycerol n-butyric ether separately .The unidirectional composite wrap materials and room temperature curing adhesive were produced . The process and effection of composite reinforcement system were studied by pipeline reinforcement room experiment and pipeline water stress experiment.The results of investigation made clear : The acrylic liquid rubbers were effective for toughening of epoxy resin . The addition of liquid rubbers resulted in a 73.9% increase in the impact strengh and a 350% increase in the fracture toughness (Gic) . The addition of bisphenol A led to a 243% increase in the impact strengh and a 1540% increase in the fracture toughness (Gic) For epoxy resin / diehylene triamine glycerol butyric ether system , the addition of liquid rubbers resulted in a 41.2% increase in the impact strengh . The tensile shear strengh of adhesive and machanical properties of uidirectional S-glass fiber and T700-cabon fiber reinforced composite materials were all high . The composite pipeline reinforcement system was ingeniously simple , faster , highly effective technology for repairing and reinforceing piperline sections weakened by corrosion or mechanical damage...