Granules special for high-temperature-resistant and impact-resistant rigid polyvinyl chloride corrugated pipe and preparation method thereof

The invention belongs to the technical field of pipe materials, and particularly relates to special granules for a high-temperature-resistant and impact-resistant rigid polyvinyl chloride corrugated pipe and a preparation method of the granules. The high-temperature-resistant impact-resistant pellet special for the rigid polyvinyl chloride corrugated pipe is prepared from the following components in parts by mass: 100 parts of PVC resin, 40-60 parts of heat-resistant modified resin, 5-8 parts of a calcium-zinc-tin composite heat stabilizer, 10-20 parts of a flexibilizer, 2-4 parts of a lubricant, 5-8 parts of a processing modifier and 1-2 parts of a natural paraffin release agent. The problems that an existing polyvinyl chloride corrugated pipe is low in heat resistance, low in impact strength and the like are solved, the calcium-zinc-tin composite heat stabilizer is adopted to form a composite stabilizer system with heat resistance and heat stability, and the high temperature resistance is improved through t