BIODEGRADABLE MATERIAL Russian patent published in 2021 - IPC C08L3/02 C08L9/00 

FIELD: technological processes.

SUBSTANCE: invention relates to production of biodegradable composite materials intended for production of insulating shells of wire metal strands used in cable industry. Described is a biodegradable material based on thermoplastic starch, characterized by that it additionally contains a mixture of suspension polyvinyl chloride, polylactic acid and polyhydroxybutyrate, clay organomodified with urea, a mixture of calcium carbonate, zinc borate, magnesium hydroxide, a calcium-zinc stabilizer and ammonium tetrafluoroborate in the following ratio, weight parts: mixture of suspension polyvinyl chloride, polylactic acid and polyhydroxybutyrate 100, thermoplastic starch 15–18, clay organomodified with urea 2–3, mixture of calcium carbonate, zinc borate, magnesium hydroxide 12, calcium-zinc stabilizer 2–4, ammonium tetrafluoroborate 2–4, wherein said matrix mixture, which includes suspension polyvinyl chloride, polylactic acid and polyhydroxybutyrate, is subjected to mixing in a high-speed mixer at 35 °C, at proportions, pts.wt 100:15:35, respectively, mixture of calcium carbonate, zinc borate, magnesium hydroxide is also subjected to mixing in high-agitating mixer at 35 °C, at proportions, pts.wt 100:45:65, respectively, organomodified clay is a product of modifying montmorillonite with cation-exchange capacity of 95 mg-eq/100 g of clay with urea in amount of 5 % of weight of montmorillonite, thermoplastic starch is obtained by mixing starch with glycerine and water at a weight ratio of 100:50:35, respectively.

EFFECT: obtaining biodegradable composite material with corresponding industrial analogue of dielectric, physical-mechanical and fire-resistant characteristics, which is decomposed in soil medium and not destructed in air atmosphere.

1 cl, 3 tbl, 5 ex