Tin-free rigid polyvinyl chloride composition for drainpipe fitting and preparation method thereof

The invention relates to a tin-free rigid polyvinyl chloride composition for a drainpipe fitting and a preparation method thereof. The preparation method comprises fully mixing 75-90 parts by weight of uracil and 10-25 parts by weight of a lipid lubricant at a temperature of 80-100 DEG C to obtain a stabilizing agent, fully mixing 1.7-2.0 parts by weight of the stabilizing agent, 100 parts by weight of polyvinyl chloride, 3.5-4.0 parts by weight of a lubricant, 5 parts by weight of a filling agent and 2.3-2.7 parts by weight of a coloring agent at a temperature of 130 DEG C through a high speed mixer and cooling the mixture in a low speed mixer to the room temperature to obtain the tin-free rigid polyvinyl chloride composition for a drainpipe fitting. Compared with the existing drainpipe fitting material, the tin-free rigid polyvinyl chloride composition utilizes an organic compound uracil without toxic or side effect and damage to the human body and the environment. A drainpipe fitting prepared from the tin-