Views: 0 Author: Site Editor Publish Time: 2021-11-18 Origin: Site
Heat-resistant cables generally refer to cables with a temperature of (90～155)℃ and below, while high-temperature cables are cables with a temperature of 180℃ and above. To solve the problem that ordinary cables are not resistant to high temperatures, it is necessary to improve the materials or use insulation-grade materials that can withstand high temperatures.
Heat-resistant and high-temperature wires and cables are generally determined by two requirements. The first is the high ambient temperature of the wire and cable, and the cable can normally transmit signals or electric energy under high temperature for a long time; the other is the power transmission cable, which is mainly to increase the interception capacity as the main purpose.
Cable working in high temperature environment. Ordinary cables are prone to insulation aging and scorching at high temperatures, and the use of cables loses performance, is damaged and cannot be used. The high temperature cable can work normally and stably under the rated high temperature, the signal or power transmission performance is not affected, and the cable has a long service life. This type of functional cable is the most common and most common type of high-temperature cable, and its use characteristics are also the easiest to understand.
Heat-resistant wires and cables are divided into two types: heat-resistant materials and heat-resistant modification of common materials.
(1) Wire and cable made of heat-resistant materials
Heat-resistant wire and cable are insulated and sheathed materials. The body resin has heat-resistant properties. The main varieties are: polyurethane (up to 155°C), polyester (up to 135°C), polyvinylidene fluoride (150°C) ) And nylon (up to 115℃) insulation or sheath material. Commonly used in industries such as communications, automobiles, motors, and construction.
(2) Ordinary cable materials are modified in various ways to achieve heat resistance:
1. Heat-resistant modification of rubber materials
2. Modification of PVC cable
3. Modification of polyethylene cable
High temperature cables are divided into high temperature cables of organic polymer materials and ultra-high temperature cables of inorganic materials.
(1) High-temperature cables with organic polymer materials are mainly fluoroplastic and silicone rubber cables.
1. Fluoroplastic insulated wire and cable
Fluoroplastic cables mainly include: high temperature communication cables, high temperature resistant lead wires and installation wires, high temperature compensation wires and industrial high temperature resistant power and control signal cables, radiation resistant cables for nuclear reactors, and wires for rolling stock.
2. Silicone rubber insulated wire and cable
Silicone rubber is mainly a polymer material formed by replacing carbon element with silicon element. Silicone rubber has good heat resistance. The commonly used silicone rubber for wires and cables is methyl vinyl silicone rubber, and the operating temperature range is -60°C to 180°C.
(2) Inorganic coated insulated ultra-high temperature cable
Inorganic insulation coated insulated cables generally use inorganic coated tapes and wires, which are processed by the cable. Refractory tape, as a high temperature resistant material, can still maintain normal insulation performance at 800°C, so it is one of the main materials for high temperature resistant cables; alkali-free glass filament is an inorganic silicon material with a certain degree of insulation, and the melting temperature is above 600°C. It is processed by weaving technology and also used as reinforcement.