Wood-plastic composite material and preparation method thereof

The invention relates to a wood plastic composite material and the method for preparing the same. The method comprises following steps: mixing raw mterial, polymerizing and extrusing in screw compressor. The raw material and their proportion by weight are as follows: wood powder or plant fiber 100, polyolefin with high melting index 10- 30, normal polyolefin 30- 50, maleic 0.1- 1, and peroxide 0.015- 0.15, and the high melting index MI is 20- 50. The invention employs plastic grafting technology, plastic alloy technology and mixed material intercrossing net conception to produce wood plastic composite material suitable for construction module. The method can take mixed recovered plastic of various variety and brand as raw material, which reduces strict requirement for plastic material and increases mechanical property for wood plastic composite material. The invention is characterized by converting disadvantages in process to advantages for mechanical property by employing effective processing technology and method.