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1.Ordinary PVC wires and cables are based on loose polyvinyl chloride resin or co-modified resin produced by the suspension process, plus auxiliary components such as plasticizers, lubricants, heat stabilizers, fillers, and colorants. , Processed by mixing, granulation and other processes, and its specifications can be divided into: insulation level, ordinary insulation level, ordinary protection level, cold protection level, soft protection level, heat resistance level, etc. The colors are also diverse and varied. According to the agreement of the cable industry, there are 10 colors of insulation class and ordinary insulation class, namely black, white, gray, yellow, orange, red, purple, blue, green and brown. The colors of the ordinary protective layer and soft protective layer are divided into 4 categories, namely black, white, gray and dark blue, and the cold-resistant protective layer is black.
2.Commonly used colorants can be divided into two categories: dyes and pigments. Due to the serious migration of dyes in PVC resin systems, especially soft PVC, only pigments can be used as colorants for PVC wires and cables. Because the properties of pigments (optical properties, fastness properties, processing properties and physical properties) are closely related to their molecular structure, lattice type, and manufacturing process, they must be selected appropriately to obtain the ideal use effect.