Long fiber reinforced polyolefin wood-plastic composite material and preparation method thereof

The invention discloses a long fiber reinforced polyolefin wood-plastic composite material and a preparation method thereof. The polyolefin wood-plastic composite material is composed of polyolefin resin, a long fiber reinforced polyolefin granular material or long fiber reinforced polyolefin strip material, a compatilizer, a coupling agent, wood powder and inorganic filler. The preparation method includes: subjecting the materials to mixing in a banbury mixer, then sending the material into an extruder to conduct extrusion and grain cutting or extrusion molding of product, or sending the material into an injection molding machine to perform injection molding. Adding of the long fiber reinforced polyolefin composite material provided by the invention can greatly improve the strength, stiffness, toughness, hardness and other mechanical properties of the wood-plastic composite material, thereby effectively enhancing the stiffness, toughness, surface hardness, nail-holding power and the like of wood-plastic boards and profile products. By means of the mixer, the long fiber reinforced polyolefin composite material or other recovered materials and wood powder, the inorganic filler and other materials can be mixed evenly. The wood-plastic material itself is reinforced, and has better performance and wider scope of application.