Effects of formaldehyde concentration on the bond quality of peanut hull extract copolymer resins

Abstract

Four different molar ratios of formaldehyde to peanut hull extracts were used to synthesize copolymer resins of phenol, formaldehyde, and peanut hull extracts. For gluing southern pine plywood, the best resins are made with 1.0 to 1.2 molar ratio. In examining the influence of different formaldehydes, there was no statistically significant difference among the resins made of 95% paraformaldehyde or 50% formalin in gluing southern pine plywood.However, the gluability in bonding southern pine plywood was significantly different between the methanol containing 37 % formalin and the other two formaldehyde sources containing no methanol.

Development of wood adhesives using flavonoid‐glycosides from orange mesocarp

“…Adhesive bonds of considerable strength have been achieved using flavonoid tanninformaldehyde resins (Coppens et al, 1980;Dalton, 1950;Pizzi and Roux, 1978), modified with phenol (Chen, 1982), urea (Ebewele et al, 1984), resorcinol (Odozi and Agiri, 1986) or cashewnut shell liquid Wankasi, 1996, Akaranta et al, 1996) in the formulation of wood adhesives. This has generated interest in the search for naturally occurring polyhydroxy compounds capable of forming adhesive resins.…”

Wood adhesives from peanut skin tannin‐formaldehyde resins modified with phenols

“…The molar ratios of the various components used in each resin are shown in Table I. A peanut skin tannin extract unit has a molecular weight of 292 (Chen, 1982) and a tannin content of 38 per cent.…”