ONE-STEP METHOD OF PRODUCING A PRO-OXIDANT ADDITIVE TO POLYOLEFINS Russian patent published in 2019 - IPC C08J3/22 C08L101/16 C08L23/00 C08K3/22 C08K3/24 C08K5/98 C08K9/08 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to chemical and petrochemical industry, specifically to a method of producing pro-oxidants – oxo-biodegradable additives for polymer materials with controlled service life. Described is a method of producing a pro-oxidant additive to polyolefins, involving reaction of a metal salt of variable valency with sodium soap of a fatty acid or sodium soap, obtained based on fatty acids, extracted from soap blanks of light vegetable oils. Method is carried out in a single-step manner in a double-screw extruder performing simultaneously a function of a reactor for reacting a sodium fatty acid soap (a mixture of fatty acids) with a salt or a metal oxide of variable valence and function of extruder for creation of polyolefin-based pro-oxide additive and obtained metal carboxylate. Time of material stay in reaction volume of extruder makes 4–6 minutes at temperature 190–200 °C. Salt or metal oxide of variable valency is represented by salts or oxides of cobalt, iron or copper, polyethylene is used as a polyolefin to produce a pro-oxidant additive. Molar ratio of sodium soap of fatty acid and salt or metal oxide of variable valence is equal to 2:1, content of polyolefin in pro-oxidant additive is 85–95 pts.wt, content of carboxylate of variable valence metal in pro-oxidant additive makes 5–15 pts.wt.

EFFECT: improvement and simplification of technology of production of pro-oxidant additives to polyolefins, reduction of negative impact on environment, improvement of technical and economic indices of production.

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