The basic performance of wire and cable Z is to effectively propagate current or various electrical signals.
According to the characteristics of wire and cable applications, color standardization is a very important indicator. The standard colors and allowable error values of various cables regulated by the industry are rigid standards that must be followed.
In addition, other chemicals added, including pigments (pigments, inorganic pigments, titanium, carbon black, etc.), must maintain the electrical properties such as electrical conductivity of plastic coating materials to the greatest extent possible to ensure the normal operation of wires and cables. use.
When pigments are used in wires and cables, in addition to the requirements for color, special attention should be paid to the following 5 points.
Usually the thickness of the wire edge layer is thin (0.2-0.4mm), and the extrusion speed is fast, especially the basic line speed of today's high-speed cable production line is 2000m/min. The quality requirements of the extruded layer are very high. Take conductive cables as an example: the spark breakdown points of each 20km long cable are ≤3.
If the pigment has a poor dispersion point in the extruded edge layer, it will cause spark breakdown, resulting in unqualified products or seriously affecting the normal production. Therefore, the requirements for the dispersibility of pigments in wires and cables are very high.
02 Heat resistance
When pigments are used in wires and cables, they must first withstand the temperature of the process. In addition, they also need to pass a series of temperature resistance test requirements for finished products and the test of the actual application ambient temperature.
Iron Blue Pigment
03 Purity (impurity content)
Pigments may bring in or remain some impurities during the production reaction and milling process. Once these impurities are mixed into the cable edge layer with the pigment, especially some conductive impurities, such as metal particles, residual salts, etc., may cause the breakdown rate of the wire and cable to increase.
04 Migration resistance
The function of the cable center line is based on the specified color. If the pigments used have migration problems, the colors between them will contaminate each other due to migration, which will reduce the recognition of the cable and leave hidden dangers.
In addition, in order to improve the quality of the call, petroleum jelly is filled between the various colored communication cables and the sheath layer. Once migration occurs, it will also cause trouble for installation and use. Therefore, the migration of pigments should be emphasized in the application of telecommunication cables.
According to the "Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment Directive" (referred to as the "RoHS Directive"), the US Congress proposed the HR2420 Act (Design Plan for Electrical Equipment), and its homogeneous materials contain lead (Pb), hexavalent chromium (Cr6+ ), mercury (Hg), polybrominated biphenyls (PBB) and polybrominated diphenyl ethers (PBDE) shall not exceed 0.1% by weight, and cadmium (Cd) shall not exceed 0.01% by weight.
Some other national or industry regulations and directives have also clearly set relevant indicators, limiting the use of raw materials in electrical and electronic applications, including wire and cable, to restricted substances such as specific metals, halogens, and other chemicals. limit control.