Environment-friendly single-layer microcellular foam PVC (polyvinyl chloride) wood-plastic composite board and preparation method thereof

The invention discloses an environment-friendly single-layer microcellular foamPVC (polyvinyl chloride) wood-plastic composite board and a preparation method thereof. According to an adopted raw material formula,the board comprises the components in percentage by mass as follows: 20%-60% of a PVC reclaimed material, 15%-45% of PVC resin, 5.6%-10% of wood fiber powder, 5%-8.9% of filler, 4%-4.4% of a foaming conditioning agent, 1%-1.5% of a compound stabilizer, 0.7%-0.9% of a foaming agent, 2%-2.5% of a reinforcing agent, 2.2%-2.4% of an impact modifier, 0.3%-0.45% of a lubricating agent, 0.1%-0.15% of a coupling agent and 3%-5% of a functional additive, and the functional additive is an anti-aging agent, a fire retardant or a coloring agent. The composite board has the processability similar to that of wood, can substitute for a wood board and also has thecharacteristics of fireproof property, moistureproof property, smooth and attractive appearance and the like, and the wood does not have the characteristics; according to the preparation method of the composite board, waste PVC can be used for performing cycle production, waste materials can be changed into things of value, waste of wood resources can be reduced, and the pollution caused by plastic products to the environment can also be avoided.