Synthesis of phenol formaldehyde (PF) resin for fast manufacturing laminated veneer lumber (LVL)
Abstract
Abstract Phenol formaldehyde (PF) resin is a well-tried adhesive for manufacturing laminated veneer lumber (LVL). PF has a high bonding strength, good cold pressing property and contributes a lot to the high production efficiency of LVL. In the present paper, PFs were synthesized at three different alkaline condition levels with a molar formaldehyde to phenol (F/P) ratio of 2.25. The bonding strength of PFs was not influenced by the alkalinity. Compared with PFs synthesized under alkalinity of 1 and 4%, PF with 8% alkalinity formed a resin with a high mole mass (MM), uniform mole mass distribution (MMD) and a high cross-linking density. With PF 8% , the cold pressing property could be shortened from 30 to 12 min in the winter time. Cured PF 8% had a higher cross-linking density than PF 1% and PF 4% . PF 8% has a high potential for industrial production of LVL.
Reference
Shu Hong; Zhongji Gu; Ling Chen; Ping Zhu; Hailan Lian. (2018). Synthesis of phenol formaldehyde (PF) resin for fast manufacturing laminated veneer lumber (LVL). Holzforschung. https://doi.org/10.1515/hf-2017-0184
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