Lead-free rigid polyvinyl chloride composition for rain pipe fitting and preparation method thereof

The invention relates to a lead-free rigid polyvinyl chloride composition for a rain pipe fitting and a preparation method thereof. The preparation method comprises fully mixing 70-85 parts by weight of uracil, 10-20 parts by weight of a lipid lubricant and 5-10 parts by weight of calcium stearate at a temperature of 80-100 DEG C to obtain a stabilizing agent, fully mixing 1.8-2.0 parts by weight of the stabilizing agent, 100 parts by weight of polyvinyl chloride, 3.0-3.5 parts by weight of a lubricant, 10 parts by weight of a filler and 2.2-2.7 parts by weight of a coloring agent through a high speed mixer until a temperature of 130 DEG C and cooling the mixture in a low speed mixer to the room temperature to obtain the lead-free rigid polyvinyl chloride composition for a rain pipe fitting. Compared with the existing polyvinyl chloride composition, the lead-free rigid polyvinyl chloride composition contains uracil which is an organic compound, has no toxic or side effect and does not damage the human body an