METHOD OF PRODUCING HIGHLY FILLED POLYVINYL CHLORIDE-BASED WOOD-POLYMER COMPOSITION Russian patent published in 2014 - IPC C08L97/02 C08L27/06 C08K3/36 

FIELD: chemistry.

SUBSTANCE: method of producing highly filled wood-polymer composition includes pretreatment of wood flour with an aqueous solution of a binding agent - silica sol, followed by thorough mixing and drying to constant weight at temperature of 100±2°C and further mixing of the treated wood flour, polyvinyl chloride (PVC), complex heat stabiliser and impact strength modifier. The PVC is pretreated with a binding agent containing 0.1-2.5 pts.wt silica sol, thoroughly mixed, dried to constant weight at temperature of 60±2°C, and the wood flour is treated with a binding agent containing 0.1-4.9 pts.wt silica sol. Content of the ingredients is as follows, pts.wt: PVC - 100, wood flour - 50-220, complex heat stabiliser - 4.5-7, impact strength modifier - 4.8-9, binding agent - 0.2-7.4.

EFFECT: wood-polymer materials based on the obtained highly filled PVC composition have an improved melt flow index, high tensile strength and thermal stability.

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