METHOD FOR PRODUCTION OF CALCIUM-ZINC STABILIZER Russian patent published in 2018 - IPC C07C51/41 C08K5/11 C08K5/09 

FIELD: chemistry.

SUBSTANCE: invention relates to petrochemical synthesis, in particular to a method for the production of calcium-zinc stabilizer for the production of hard and plasticized PVC compositions, and can be used as a heat stabilizer for the production of rigid and plasticized PVC compositions: profiles, pipes, wallpaper, hoses, containers, artificial leather, linoleum, as well as products made from them, for example, when casting under pressure, opaque and translucent wire insulation etc. Described is a method for the production of calcium-zinc stabilizer for the production of rigid and plasticized PVC compositions including the preparation of raw materials, the precipitation of calcium stearate and zinc stearate, mixing of calcium stearate with zinc stearate, filtering the calcium zinc stabilizer suspension, drying, packing and packaging the product, with the precipitation of calcium stearate and zinc stearate separately produced in the respective reactors, moreover, the process for obtaining calcium stearate involves the interaction of stearic acid and calcium hydroxide by heating and intensive mixing, followed by heat treatment, while the interaction of stearic acid and calcium hydroxide is carried out in an aqueous medium, and the emulsion is heated to 60–65 °C, transferred to a state of stable emulsion, maintained at this temperature for 110–120 minutes, heat treatment is carried out to aggregate particles, with constant stirring of the suspension, while the temperature is raised to 80–85 °C, maintained at a predetermined temperature for 10–15 minutes to pH 8.5–9.0 of the mother solution of the basic substance and acid number, followed by injection into the apparatus for mixing calcium stearate and zinc stearate, and the precipitation of zinc stearate involves pouring water into the reactor, mixing, then the concentrated hydrochloric acid at pH of 2.8–3.5 is poured in, zinc oxide is added, the temperature is raised to 90–92 °C using live steam, solid stearic acid is added, the temperature of the reaction mass is raised to 96–98 °C, the suspension circulation with the possibility of dissolving precipitated zinc oxide is performed for 110–120 minutes at a temperature of 96–98 °C, the suspension of zinc stearate is transferred to a stable emulsion to 4.5–5.0 pH of the mother solution, the acid number of 5.0 mg KOH/g and the content of the basic substance 10–11 wt.%, followed by pouring chemically purified water, mixing and pumping of stearate and zinc stearate into the apparatus for mixing calcium, and then a suspension of calcium stearate and zinc stearate is discharged, mixed for 20–30 minutes to obtain the basic substances of calcium stearate within 3.5–5 wt.% and zinc stearate within 2.5–3.5 wt. %.

EFFECT: simplifying the process and increasing the activity and stability of the stabilizer for the production of rigid and plasticized PVC compositions.

1 cl, 2 dwg