(a) wire and cable wire and cable resistance materials heat-resistant material is insulating and sheathing materials of body resin with heat resistance, the main varieties are: polyurethane (up to 155 DEG C grade), polyester (up to 135 DEG C), polyvinylidene fluoride (150 DEG C) and nylon (up to 115 DEG C) insulation or sheath material. Commonly used in communications, automotive, electrical, construction and other industries.
(two) the heat resistance of ordinary cable material is improved by various means:
1, heat resistance modification of rubber materials
Rubber materials because of its poor heat resistance, thus increasing the working temperature of the redundancy is small, ordinary rubber filled with more heat stabilizer and crosslinked can reach 90 DEG C, which can be called a heat-resistant cable, such as styrene butadiene rubber, chloroprene rubber, chlorosulfonated polyethylene etc.. The utility model is mainly used for rubber insulated flexible wire, rubber insulated soft power cable and control cable. But three Yuan rubber can be modified, so that the temperature rating increased to 135 DEG C, and has good insulation properties, so it has good prospects in rubber.
2, PVC cable modification
Ordinary PVC cable working temperature of 70 DEG C, PVC cable material highly mixed, the modification is possible, the use of large amounts of heat stabilizer, PVC can heat up from 70 C to 90 C and 105 C, and the applicability of PVC to the old materials greatly expand, perhaps this is PVC cable has one of the reasons? 90 C PVC cable material commonly used in XLPE cable sheath, mainly used in electric power, control and electrical equipment cable, due to the modification of PVC, the elimination of PVC cable material on using the jacket will continue for a long time. The main component of PVC nitrile compound is PVC, and PVC butyronitrile composite cables and PVC insulated cables with the same modification performance.
3, polyethylene cable modification
The polyethylene material has good plasticity, but the filling property is poor, so it can not be filled with heating stabilizer to improve heat resistance. Polyethylene cable can be increased to 90 DEG C by DCP dry chemical crosslinking and silane warm water crosslinking. The former is used for medium and high voltage power cable, the latter is used for low voltage cable. But another way of crosslinking radiation crosslinking modified, can be polyolefin (mainly polyethylene) the working temperature is greatly improved, the insulation material irradiated according to different conditions, temperature resistance can be reached 105 C, 125 C, 135 C and 150 C, while abroad can be improved to 180 DEG C. Is converted into stable bond energy by electron, the molecular structure to strengthen the thermal stability, at the same time with the appropriate heat stabilizer, according to the size and level of heat stabilizer effectiveness, divided into different level of heat.
It is the purpose of the electron beam to increase the energy of the electron beam, and achieve the purpose of crosslinking polyolefin materials. The energy level of the accelerator is 1 ~ 3MeV. The crosslinking of rubber, PVC and fluoro plastics can be crosslinked by irradiation.
Radiation crosslinked polyolefin wire and cable is mainly used in heat resistant building lines, automotive lines, aviation wires, locomotive wire and wire and electrical wiring.
Heat resistant cable is medium temperature cable, with a certain heat resistance, can adapt to a certain temperature environment. The most widely used is that in the power transmission cable, to ensure the insulation performance at the same time, increase the capacity of the cable current carrying capacity, reduce the weight and cross section of the cable, significant.
