There are many methods for manufacturing wood-plastic composite materials from wood and plastic. Whether using thermosetting resin or thermoplastic, the most important problem is to solve the problem of poor interface compatibility between strong polar wood and weak polar plastic. Modification of wood or the use of additives are usually used to enhance the interface bonding strength of composite materials.

Wood surface modification methods are divided into physical methods and chemical methods, mainly to improve the surface activity of polymers. The number of hydroxyl groups on the wood surface is reduced by chemical reactions, physical and chemical crosslinks are established between the wood / plastic, and a hydrophobic film is formed on the wood surface to improve its compatibility with the plastic and promote the uniform dispersion of the wood. At present, coupling agents, compatibilizers, etc. are often used for surface modification of wood. 

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