METHOD OF PRODUCING ORGANIC-MINERAL COMPOSITE FOR THERMOPLASTIC OXO-BIODEGRADATION Russian patent published in 2020 - IPC C08L7/02 C08K9/04 C08L101/16 C08J3/00 

FIELD: chemistry.

SUBSTANCE: invention relates to production of elastomer compositions with high content of mineral filler and can be used in production of organic-mineral biodegradable additive. Method of producing an organic mineral composite for oxo-biodegradation of thermoplastics includes steps of preparing an aqueous dispersion of a mineral filler, liquid phase alignment of the aqueous dispersion of the filler with latex, separating the filled elastomer system, dehydration and drying of the obtained composite, wherein preparation of the aqueous dispersion of the modified filler, wt%: water – 92.92–92.96; natural calcium carbonate – 7.00 and PolyDADMAC 0.04–0.08 is performed by mixing components at ultrasonic effect from 2.0 to 6.0 min, liquid-phase combination of natural latex is carried out by diluting to dry rubber content of 5.0 to 15.0 wt%, followed by introduction of an aqueous dispersion of calcium carbonate, with the following ratio of components, pts.wt: natural rubber : modified calcium carbonate is 100:(250÷400) with constant stirring and subjected to ultrasound action for 3–10 minutes, extraction of the filled elastomer composition is carried out on a filtering surface from a capron micro-mesh with subsequent mechanical-thermal dehydration in a twin-screw unit with a vacuum zone with a granulating device, where at 160–190 °C the composite is dehydrated to moisture content of not more than 2.0 wt%; the obtained granulate is mixed with a synthetic thermoplastic in terms of dry calcium carbonate, pts.wt. – polymer : calcium carbonate = 100:(5÷30).

EFFECT: technical result is production of organomineral composite promoting biodegradation of thermoplastics, as well as obtaining a highly filled master batch, low consumption of coagulating substances, efficient distribution of filler over the polymer phase, obtaining a highly disperse system, wider field of use of the obtained masterbatches, low cost of the obtained products.

1 cl, 5 tbl