We all know that WPC Laminated Board plays a vital role in our production and life, so what is the introduction of WPC Laminated Board composite materials? Next, let us take a look.

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WPC Laminated Board hydrophilic surface

Composite surface gluing

WPC Laminated Board hydrophilic surface

Compared with the untreated surface, the contact angle and roughness of the surface of WPC Laminated Board composites have increased. The wettability is composed of two parts, namely the wettability caused by surface chemistry and the wettability caused by surface roughness. For the hydrophilic surface of the WPC Laminated Board, increasing the surface roughness can make the surface more hydrophilic, while the effect of the hydrophobic surface is opposite. The surface of the WF /HDPE composite material is rich in a large amount of hydrophobic HDPE components, and the surface is smooth. According to the Wenzel equation, for materials with a smooth surface (contact angle <90°), increasing the surface roughness can increase the surface contact angle of the liquid. There will be some burrs on the surface after being polished with 320 grit sandpaper, indicating that this hydrophobic rough structure increases the surface contact angle, while the surface roughness after being polished with 600 grit sandpaper is slightly lower than the former, so the surface contact angle is also smaller than the former. However, the increase in roughness also increases the spreading area of the glue on the surface. At the same time, the WPC Lamination Board fibers are exposed after polishing, which helps the adhesion of polyvinyl acetate on the surface. The surface contact angle of WPC Laminated Board composite material decreased significantly after UV irradiation treatment. This may be due to the increase of oxygen-containing functional groups on the surface as the UV irradiation time increases, which is beneficial to improve the surface wetting effect. After being heated by infrared radiation and lightly sanded, the contact angle of the surface of WPC Laminated Board composite material decreases significantly. This is because the surface layer melts and sinks under the action of high temperature, and light sanding can expose more wood fibers, which makes it hydrophilic. Increase, the wettability is enhanced.

Composite surface gluing

The surface bonding performance of the untreated WPC Laminated Board composite material is very poor, and the surface veneer effect is significantly improved after the sanding treatment, and the surface bonding strength of the 320-mesh sandpaper sanding test piece is higher. In addition to fiber exposure, the polarity has increased, and the surface profile polished by 320 grit sandpaper is appropriate, which is also beneficial to the glue embedding, so the interface bonding effect is better. In the UV irradiation treatment group, the surface bonding strength of the specimens treated for 24 h was the best. With the prolonging of the irradiation time, the surface bonding strength decreases. This is because too long UV irradiation time will damage the surface, make the bond between the surface materials worse, the substrate surface strength decreases, and the veneer performance deteriorates. In the infrared radiation treatment group, 180 ℃ -25 s infrared radiation is the better treatment condition, and the surface bonding strength of WPC Laminated Board composite material is the best. If the temperature of the infrared radiation heating treatment is low, the test piece will not be sufficiently heated, the polymer melting effect will be poor, and the surface fiber will be exposed unevenly; if the temperature is too high, the WPC Lamination Board substrate will melt excessively without mold pressure, The base material is loose, and the surface structure of the WPC Laminated Board is damaged. Therefore, suitable temperature and treatment time are required.

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