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B2B space
18 juillet 2013

The water absorption issue of WPC board

Wood Plastic Composites(WPC) is actually a sort of green environmental protection material that springs up in current years. The principle supplies of WPC board are agricultural and forest residues and abandoned plastics for example PE and PP. It is put to use because the replacement of natural timber. So it has fantastic signigicance to analysis tips on how to alleviate the scarce situation of all-natural timber utilizing WPC material. Because of the super water absorbent defect of plant fibre, the way to lessen the water absorption of wood plastic composite wall panel supplies properly has been a crucial technical difficulty of domestic and foreign investigation present scenario.
Why WPC absorbs water?
One from the main materials of WPC is agricultural and forest residues, whose main element is plant fibre. Although the plant fibre of WPC supplies is coated by plastics, component hydroxy around the surface has been modified by etherification or esterification during the creating process. The water absorption of WPC is far beneath the timber, and it truly is why persons did not spend substantially consideration on this concern in the early stage. In recent years, some research have shown that right after soaking for any lengthy time, the water absorption of wpc floor will considerably improved, particularly for outside applications.
Wood plastic composite absorbing water will happen immediately after deformation substantially. That is because the plant fiber after water absorption expansion force on the surrounding plastic substrates, under the acting force, macromolecular chain easy to generate the plastic substrate molecular creep, relaxation and as a result easy to lead to wood plastic composite deformation. Through research recommend that the presence of moisture damage the wood/plastic interface, the result could make the plastic relaxation of molecules are more most likely to come about, so using the improve of water content, wood plastic composite materials under the action of constant force a dramatic increase inside the total deformation, removed soon after continual external force, the permanent deformation of wood-plastics composites are increased drastically.
As a consequence of the suction impact to make plant fiber expansion, will also bring some alterations to the size from the wood plastic composite products, and aggravate its deformation. Research have shown that using the immersion time, the thickness on the wood plastic composite expansion boost gradually, and the expansion of your thickness is straight related to plant fiber content.
Wood plastic composite fungi corrosion troubles. Wood plastic composite on account of fill lots of plant fiber, though plant fibre is plastic coated and role by coupling agent or compatilizer, as a result will not be so simple to mildew rot fungi pure plant fiber (just like mold and wood rotting fungi) infection, but soon after absorbing water reaches a certain humid circumstances can still give a fantastic living atmosphere for fungus, mildew wood-plastics composites, even decay, and drastically shorten their service life. Simultaneously, the mould could make the wood plastic composite surface visible mold spots, impact the look.
As pointed out above, the root cause of the wood plastic composite suction is plant fiber containing polar hydroxyl, so, wood plastic composite fiber hydroxyl inside the reduced polarity after reaction with specific groups, beneficial interfacial compatibility, decrease plant fiber content in wood plastic composite things will influence the bibulous rate of wood plastic composites.

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