POLYMER COMPOSITION FOR PIPE PRODUCTION Russian patent published in 2015 - IPC C08L27/06 C08K3/04 C08K3/26 

FIELD: chemistry.

SUBSTANCE: invention relates to formulation of polymer composition based on non-plasticised polyvinyl chloride (UPVC), which is applied in production of free-flow (sewage) pipes by method of extrusion. Polymer composition for production of pipes contains NPVC with value of Fikentscher constant (K) 66.0-69.0 and bulk weight 0.4-0.6 g/cm³, calcium carbonate, complex thermostabiliser: tribasic lead sulphate Pb₂(SO₄)₃ - 17%, bibasic lead phosphite 2PbO·PbHPO₃·0,5H₂O - 18%, lead stearate Pb(C₁₈H₃₅O₂)₂ - 28%, calcium stearate Ca(C₁₈H₃₅O₂)₂ - 27%, antioxidant - 10%, impact resistance modifier: chlorinated polyethylene CPE 135, fluidity modifier: acryl processing anti-stick additive, lubricant: polyethylene wax, stearic acid, soot. Polymeric composition can additionally include recycled furniture PVC film or recycled waste PVC panels. Mixing of all components is carried out in three stages: mixing in hot mixer, mixing in cold mixer, exposure of mixture at temperature 15-30°C for 24 hours. Prepared in such way mixture is supplied in extruder.

EFFECT: invention makes it possible to obtain polyvinyl chloride product with high impact viscosity, perfect quality of external and internal surfaces and low prime cost.

3 cl, 2 tbl