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Nano composites have excellent mechanical properties and have always been a research focus of polymer composites. The composite of carbon nanotubes, montmorillonite, nano calcium carbonate and other nano particles with plastic wood composite materials can effectively strengthen and toughen the plastic wood composite materials. In recent years, there have been more and more nano wood plastic composite products in the European and American markets. So far, nano wood plastic composite products have accounted for more than 50% of the total plastic wood composite products. It is not only the traditional high-end plastic wood composite doors and windows, handrails, and fences that use plastic wood composite nanotechnology. Even low-end floors, fences, external wall panels, and templates are increasingly adopting plastic wood composite nano technology. It can be said that plastic wood composite nano technology has become the mainstream trend of plastic wood composite products.
In the international market, wood plastic composite flooring is classified as "low maintenance" products, and nano wood plastic composite flooring and PVC crust foam flooring are classified as "ultra-low maintenance" products. The reason is that nano plastic wood composite flooring has better surface treatment and weather resistance. It has stronger performance, high surface hardness and is not easy to scratch, and the water absorption rate is lower. The fading and surface cracks of plastic wood composite products are fatal defects of plastic wood composite products, and the use of nano technology to seal the core material can effectively solve these problems fundamentally. At present, there are mainly PVC, PE and ASA types of plastic wood composite nano types. Among them, PE-type plastic wood composite nano production is relatively large (the reason is that PE-type plastic wood composite has a large amount, accounting for more than 75%).
Some manufacturers worry that co-extruded wood will increase the cost of products. In fact, the direct cost of nano wood production will not increase. Although the cost of the surface nano layer is high, the cost of the core layer is reduced (recycled material, less additives , more wood flour). The thickness of the nano surface layer is very thin (0.3~0.5mm, only 1mm to be embossed), you can add good additives (anti-UV, antibacterial, color masterbatch, lubrication, etc.) that you usually don’t want to use, and you can also add more colors some. According to reports, the world’s second largest plastic wood composite factory originally only had 4 colors, while the nano plastic wood composite flooring has 8 colors, which can be easily achieved by adding a side feeder to the hopper of the nano extruder. The direct cost of production has not increased, but the initial investment in molds and nano specific extruders is required.
Usually the plastic wood composite nano special extruder uses TC35 or TC55 conical twin-screw extruder, which has high back pressure, small shear, and good plasticization and mixing. In addition, compared with ordinary wood-plastic extruders, because the nano layer is very thin, the special-purpose wood plastic composite nano extruder has higher process requirements, and the control of temperature, pressure and output flow speed is more precise, requiring the core layer and nano surface layer The welding and coating are better. In addition, the screw design is also different, requiring a larger compression ratio, larger contact surface, smaller shear, and higher pressure in the extrusion section.