METHOD FOR OBTAINING A LIGNOCELLULOSIC FILLER FOR WOOD-POLYMER COMPOSITE MATERIALS

The invention relates to obtaining a lignocellulosic filler for wood-polymer composite materials. In this method, combining activation and modification of wood particles, with the aim of reducing expenditures of energy for obtaining a wood filler and enhancing the mechanical properties of the wood-polymer composite materials based on secondary polypropylene, for the activation of the lignocellulosic particles, as an aqueous solution of the hydrolysing agent, an aqueous solution of caustic soda is used, a thermal treatment after the hydrolysis is carried out at a temperature below 100 Celsius degrees, and the modification of the activated lignocellulosic particles is carried out by way of their treatment with an aqueous solution of the polyethylenimine-lignin polyelectrolyte complex.The offered method, in comparison with the method after the prototype, allows to reduce the energy consumption for obtaining the wood filler by 1.5 to 2.3 times and to increase more than 2 times the mechanical strength of the secondary polypropylene-based composite material.