Now the most commonly used data electronic cable is the usb electronic cable. It is used in various places and used in life or work. The layout of the USB cable is simple. What about the structure of the electronic cable? The plastic characteristics of commonly used outer covers for usb electronic wires can be roughly divided into the following points:
1. It has the characteristics of extremely good tensile strength and elongation, and it is also the best material for insulation coating materials with strong toughness, abrasion resistance and corrosion resistance.
2. High shrinkage rate, easy to shrink when injection molding, good electrical properties, good water resistance, abrasion resistance, and chemical resistance. It is mainly used as insulating material for telephone and communication cables.
3. The proportion of pvc is about 1.4. The surface is white powder. Water resistance, acid and alkali resistance, flame resistance and electrical insulation are all very good. Oil resistance, ozone resistance, chemical resistance are also good, and non-toxic. Therefore, it is adopted as a material for cable insulation and coating. However, pvc is a polar material with poor dielectric properties, so it is generally limited to pvc wires below 600v, communication office wires, and cable covered pvc soften at 65-85℃, and have complete plasticity at 190℃ at 120-150℃ The above is broken down violently. It emits hydrochloric acid gas, so the temperature range for its proper processing is about 150-180℃.
4. As the density increases, the softening temperature increases, the tensile strength increases, the elongation decreases, the flexibility gradually loses, the strength and toughness increase, and the impact strength decreases. Because of its low dielectric constant and high insulation resistance, pe has excellent electrical performance and is often used in coaxial cable or high-frequency materials. The weakness is: it is flammable, and the maximum execution temperature is 80°C.