METHOD FOR PREPARING PHOTO- AND THERMOSTABILIZER OF WEATHERPROOF POLYETHYLENE

摘要

FIELD: organic chemistry, chemical technology. ^ SUBSTANCE: invention relates to a method for preparing a photo- and thermostabilizer for preparing weatherproof polyethylene. Method for preparing photo- and thermostabilizer involves heating 2-tert.-butylphenol and methanol in autoclave in the presence of alkali and zinc oxide at temperature 220-250°C and prepared product represents a mixture comprising tert.-butylated hydroxy-exo-calyx[4]arenes and methylene-bis-phenols. For stabilizing high density polyethylene the use of a mixture of tert.-butylated hydroxy-exo-calyx[4]arenes and methylene-bis-phenols taken in the amounts 0.25-0.5% is the most effective. Photo- and thermostabilizer are prepared for a single stage by using available taw. Photo- and thermostabilizers of weatherproof polyethylene represents a mixture of tert.-butylated hydroxy-exo-calyx[4]arenes and methylene-bis-phenols and provides more effective photo- and thermostabilization as compared with using individual products as stabilizers. ^ EFFECT: improved preparing method. ^ 2 tbl, 1 dwg