Improvement of wood plastic composite boards performance
The use of wood plastic composite materials is of great significance for saving non-renewable resources and improving the utilization rate of resources. Improving the performance of WPC is conducive to promoting wood plastic composite boards and other wood plastic products to society. There are three main ways to improve the performance of wood plastic composite materials:
1.Pretreatment of wood parts
The pretreatment of wood parts can be divided into two categories, physical methods, and chemical methods.
Physical methods include the following methods: physical processing, electrostatic surface etching, alkali treatment, acid treatment, and organic solvent treatment.
Chemical methods include the following methods: surface grafting and interface coupling.
2.Pretreatment of plastic parts
Because the polarities of plastic and wood are different, if the non-modified wood is non-polar, the modifiable plastic is polar, thereby improving the compatibility of the wood cellulose phase and the plastic phase. A common method is to directly put the plastic and additives into a twin-screw extruder so that the plastic undergoes a graft reaction in the molten state to change the polarity.
3. Add the third component
This is currently the most widely used modification method. This third component is generally a compound containing a polar group at one end and a non-polar group at one end and is also commonly referred to as a coupling agent. It can make the polar end compatible with the wood part, and the non-polar end compatible with the plastic part, thus acting as a bridge between the two phases.