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After use for some time, the color of the rubber cable copper wire tends to be black. The reasons for this are: There are many reasons that lead to blackening of rubber cable copper wires. Apart from the material formulation of the rubber, the status of the copper wire itself, the rubber processing technology, the rubber vulcanization process, the structure of the cable, and the protection It is related to many factors such as rubber formula and production environment.
In the 1950s and 1960s, most domestic manufacturers in China used ordinary copper rods (a copper content of 99.99%, all of which were aerobic copper rods). The production method was to produce black copper after multi-pass rolling after the copper ingot was heated. Rod, after the large, medium and small pull, the copper rod is made into finer copper wire. Because copper itself is not oxygen-free copper, oxidation of the surface of the copper wire is inevitable during processing.
In the 1980s, the introduction of advanced oxygen-free copper rod production technology in China, as well as domestic research and development of oxygen-free copper rod technology, the entire wire and cable industry began to use oxygen-free copper rods, greatly improving the copper wire black problem. However, due to the processing of copper rods, especially the mastery of the toughening process and the poor storage conditions of copper cores after processing, slight oxidation of the copper core surface occurs.
In the 1950s, rubber insulation was formulated using natural rubber and styrene-butadiene rubber. Since the insulating rubber is in direct contact with the copper wire and cannot be directly used as a vulcanizing agent, even if a small amount of sulfur is used, the copper wire will be blackened. Therefore, some compounds capable of decomposing free sulfur, such as accelerator TMTD, vulcanizing, have to be used. Agent VA-7, but also with vulcanization accelerator to increase the vulcanization rate and degree of vulcanization, to ensure that the insulating rubber physical and mechanical properties and electrical properties. However, from the point of view of the elasticity, strength and permanent deformation properties of the insulating rubber, the rubber with sulfur is the best (for the time being, the copper wire is not blackened).
The rubber sheath cable is a kind of soft and movable cable product, which is made up of many fine copper wires as conductors, rubber insulated and rubber sheathed. Generally, the rubber sheath cables mainly include general rubber sheathed flexible cables, electric welding machine cables, submersible motor cables, radio device cables, and photographic light source cables.