| 摘要 |
The invention relates to means for monitoring pre-fire situations arising as a result of the local overheating of electrical equipment and is intended for preventing fires caused by electrical wiring faults. The present device for warning of local overheating is made of a cross-linked polymeric composite material with an explosive rupture temperature in a range of 80-200ºC, which contains an odorant. In certain embodiments of the invention, the polymeric composite material is in the form of microcapsules with an odorant core, which are dispersed in a binder made from a thermoset polymer. In other embodiments of the invention, the polymeric composite material is in the form of a polymer gel comprised of particles of a cross-linked polymer, which are swollen in an odorant solution, and situated in a thermoset polymer matrix. In other embodiments of the invention, the polymeric composite material is in the form of particles of silica gel or zeolite, onto which an odorant is sorbed, said particles being situated in a cross-linked polymer matrix. Sulphur dioxide, low mercaptans, dialkyl sulphides, dialkyl disulphides, combinations or solutions thereof are used as odorants. Hydrofluorochlorocarbons, hydrofluorocarbons, fluorocarbons, perfluoro(ethyl isopropyl ketone), alkanes, simple esters or combinations thereof can be used as solvents for the odorants. |
