Study on formaldehyde emission of wood-based panel

The paper developed a new synthetic technology of urea-formaldehyde resins, and the content of free formaldehyde was more than 0.3%. The urea-formaldehyde resin had been used for making plywood. The free formaldehyde emission of plywoods was less than 0.2mg/L, which indicated that the plywood met the F0 Grade in JIS Standard. In order to contrast to commonly synthetic technology the resins were investigated with DSC and GPC. The results showed that resin had more cured degree than common resin. While the main reason of low formaldehyde emission was the structure of the resin tighter than common resin. The research provided a way for manufacturing resin, using resin and the researcher controlling the formaldehyde emission.