STUDY ON PREPARATION AND PROPERTIES OF PHENOL-FORMALDEHYDE-CHINESE FIR LIQUEFACTION COPOLYMER RESIN

Ruihang Lin, Jin Sun, Chao Yue, Xiaobo Wang, Dengyu Tu, Zhenzhong Gao

Abstract


A new zero-waste and zero-pollution composite adhesive labeled Chinese fr-based adhesive for exterior plywood was synthesized by blending alkaline Chinese fr (Cunninghamia lanceolata) liquid with a small amount of phenol-formaldehyde (PF). The free phenol and free formaldehyde content of the Chinese fr-based adhesive were sharply decreased compared to normal PF resin by more than 50%. The synthetic adhesive show with excellent water resistance and environmental friendliness, which had a 28h boil-dry-boil wet bonding strength of 1,73MPa according to standard JIS K6806-2003 and a formaldehyde emission of 0,045mg/L according to standard JIS A1460-2003. The structural properties and their thermal properties of cured adhesives were evaluated using Fourier transform infrared (FT-IR) and differential scanning calorimetry (DSC). The FT-IR analysis confrmed the expected chemical structure as the Chinese fr liquid reacted with formaldehyde and phenol which occurred at the wavenumbers of 1733, 1698, 1652cm  and 1077, 1048 cm . Although the DSC results indicated that the Chinese fr- based adhesive’s curing need higher temperature than the control PF resin, the higher curing temperature hardly cripple the availability of Chinese fr-based resin in the plywood production. 

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