The invention discloses a
thermoplastic polyester elastomer heat-shrinkable casing tube for an automobile wire harness as well as a preparation method and an application of the heat-shrinkable casing tube. The heat-shrinkable casing tube comprises the following components in parts by weight: 50-80 parts of a
thermoplastic polyester elastomer, 30-60 parts of
halogen-containing resin, 5-15 parts of black
masterbatch, 5-30 parts of diantimony
trioxide, 0-100 parts of a
flame retardant, 3-15 parts of a
flame retardant synergist, 1-4 parts of a thermal stabilizer, 0.5-4 parts of an
antioxidant, 0.5-2 parts of a
silicone aid and 1-2.5 parts of a sensitizer. The preparation method comprises the following steps: mixing the
thermoplastic polyester elastomer, the
halogen-containing resin, the black
masterbatch, diantimony
trioxide, the
flame retardant, the flame retardant synergist, the thermal stabilizer, the
antioxidant and the
silicone aid, adding the sensitizer, mixing, granulating, extruding to form a tube, performing
irradiation crosslinking, stretching by expanding, shaping by cooling, flattening, and marking. The heat-shrinkable casing tube has the advantages of relatively low price, high-efficiency flame retardance, excellent
mechanical property, low
pollution, high-temperature oil resistance, acid-base
corrosion resistance and capability of being applied in a severe
working environment.