The invention provides a formula of a low-
viscosity, low-
smoke and
flame-retardant high-speed
elevator balance compensating chain PVC sheath material, which is adapted to a rapid moulding technology and meets an environment-friendly requirement, and a preparation method thereof. The
raw material formula of the low-
viscosity, low-
smoke and
flame-retardant high-speed
elevator balance compensating chain PVC sheath material comprises the following components in parts by weight: 100-150 parts of PVC resin, 60-120 parts of a
plasticizer, 4-8 parts of a stabilizer, 2-8 parts of a
lubricant, 30-60 parts of a
flame retardant, 5-15 parts of a
smoke suppressant, 5-20 parts of a
viscosity reducer and 0.3-1.0 part of a
pigment. The preparation method comprises the following steps: mixing the PVC resin to 70-80 DEG C in a kneading
machine, then adding a certain amount of an auxiliary agent, continuing mixing, and discharging after the temperature of a mixed material reaches 85-95 DEG C; sending the mixed material into a cooling stirrer, and cooling to 40-50 DEG C; finally, placing in a conical twin-screw extruder, and performing
extrusion granulation at the extruding temperature of 130-170 DEG C to obtain a low-viscosity, low-smoke and flame-retardant elastic PVC material. The special low-viscosity, low-smoke and flame-retardant high-speed
elevator balance compensating chain PVC sheath material prepared by the preparation method provided by the invention can be applied to the rapid moulding technology of an elevator balance compensating chain sheath, has relatively good appearance, high
toughness,
high heat aging resistance and
high heat stability, and has low viscosity, low smoke performance and flame retardance.