The non-metallic powder, also called VT powder, is a kind of thermosetting plastic powder, which is mainly composed of glass fiber and thermosetting resin. It can be used to modify filling materials and waterproof materials.
Due to the fact that thermosetting plastics can not be recycled, the VT powder obtained from the recycling of PCB waste circuit board is usually used to recover calorific value by incineration, or as powder filling for coating and paving materials. The grade of recycled products obtained by these methods is relatively low, and they are at a disadvantage from the perspective of resource utilization and economic investment. However, it is a new way to study the properties of recycled non-metallic powder (VT powder) as filler in polyethylene (PE) based resin wood composites. It also provides a new environmentally friendly and extremely low-cost filler for the field of recycled plastic modification.
Recycling and processing of nonmetal powder for PCB
Filling VT powder into recycled polyethylene (PE) has a positive effect on the physical properties of new resin wood composites. The experimental results show that VT powder can enhance PE to a certain extent. When the content of VT powder is 50%, the flexural modulus of the new composite increases significantly. At the same time, it was found that the tensile strength and flexural strength of VT powder / PE WPC could be improved by adding 3% PE compatibilizer.
According to a certain proportion, the PE recycled resin, VT powder, compatibilizer and lubricant meeting the requirements were accurately weighed and evenly stirred in a high-speed mixer. Then the VT powder / PE composite was prepared by extrusion and granulation in a parallel twin-screw extruder; Then, the mechanical properties of the test strips in accordance with GB / t24508-2009 standard were obtained by the conical twin-screw extrusion mechanism, and the related properties were tested.