LOW-GAS PERMEABILITY NANOCOMPOSITE AND METHOD OF PRODUCING SAID NANOCOMPOSITE (VERSIONS) Russian patent published in 2012 - IPC B82B3/00 C08L23/06 C01B33/146 C08J3/22 

FIELD: chemistry.

SUBSTANCE: invention relates to a polyethylene-based nanocomposite, methods of producing said nanocomposite and can be used in food industry, chemical industry and in medicine when producing novel materials with improved physical and mechanical properties and low gas permeability (high barrier characteristics). The nanocomposite contains low-density polyethylene as a matrix and filler in form of nanoparticles with a general chemical formula [SiO₂]_k[Si(CH₃)₂C_nH_2n+1]_m, which are molecular silica sols whose surface is modified with alkyl groups of chemical formula (-C_nH_2n+1), where n ranges from 10 to 18, k ranges from 10 to 1000, m ranges from 10 to 1000, the ratio k:m varies from 0.5 to 2. The filling ratio of the composite ranges from 1 to 5 wt % with respect to the weight of polyethylene. Molten polyethylene and nanoparticles are mixed in an extruder at temperature 160°C-220°C.

EFFECT: disclosed nanocomposite has good manufacturability and can be processed using an extrusion method to obtain articles in form of films which are characterised by low oxygen and nitrogen gas permeability.

19 cl, 1 tbl, 7 ex