17 августа, 2015 
Malyar A urea-formaldehyde resin is prepared and resorcinol is grafted onto it as both terminal units or as middle connecting units leaving each resorcinol to present one or two still reactive sites through which to effect the final cross-linking and hardening of the resin. The schematic reaction is shown in Formula 7.
The behavior of this adhesive is identical to that of adhesive 2, although larger amounts of resorcinol are used. These adhesives have a higher formaldehyde/urea ratio,
are water resistant, and are capable of radiofrequency curing. They can also be used for plywood manufacture, although the high price of resorcinol renders them unsuitable for such an application.
Опубликовано в рубрике 