| abstract |
The invention discloses a kind of environmental protection polyvinyl chloride billboard, which includes sandwich layer and is covered in the protective layer of core layer surface, and sandwich layer is Foamed polyvinyl chloride material, can effectively reduce the density of billboard, cost-effective；Protective layer is the pvc material not foamed, and has the advantages that hardness is high, good weatherability, surface is smooth, glossiness is high.The present invention also provides a kind of methods preparing the polyvinyl chloride billboard, are squeezed out sandwich layer melt and protective layer melt respectively using coextrusion mold, and polyvinyl chloride billboard is made.Billboard preparation process of the present invention is environmentally friendly；Filler is prepared as raw material using the random polypropylene waste material generated in polypropylene production process, the recycling problem of random polypropylene is not only solved, reduces production cost, moreover it is possible to significantly improve the toughness of billboard.Environmental protection polyvinyl chloride billboard mature preparation process in the present invention, operation is simple, is suitable for industrialized production. |