Epoxy resin system for in situ rehabilitation of pipes

Patent · Tue Apr 14 04:00:00 EDT 1992

OSTI ID:5123596

Edwards, G D; Wilson, B S

This patent describes a process for in situ pipe rehabilitation. It comprises: impregnating a fibrous substrate with a liquid epoxy resin composition comprising at least one liquid epoxy resin having epoxide equivalent weight within the range of about 165 to about 195; a minor amount, relative to the liquid epoxy resin, of an epoxide functional reactive diluent; a minor amount, relative to the liquid epoxy resin, of a thixotroping agent; and an effective amount of a liquid curing agent comprising a polyamide resin, a polyoxalkylenediamine, and from about 35 to about 55 weight percent, based on the weight of component, of 2-ethyl-4-methyl imidazole or derivatives thereof; positioning the resin-impregnated fibrous substrate within a pipe to be rehabilitated so that a surface of the resin-impregnated fibrous substrate is in contact with the interior surface of the pipe; and subjecting the thus-positioned resin-impregnated fibrous substrate to conditions effective to cure the liquid epoxy resin.

• Assignee: Shell Oil Co., Houston, TX (United States)
• Patent Number(s): A; US 5104691
• Application Number: PPN: US 7-764742
• OSTI ID: 5123596
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
022000* -- Petroleum-- Transport
Handling
& Storage
42 ENGINEERING
420205 -- Engineering-- Transport & Storage Facilities-- (1980-)
EPOXIDES
MAINTENANCE
MATERIALS TESTING
OIL WELLS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PIPELINES
POLYMERS
POSITIONING
REPAIR
RESINS
SUBSTRATES
TESTING
WELLS