From: Jacob Zabicky (zabicky$##$bgu.ac.il)
Date: Sun Jul 01 2007 - 18:10:02 EDT
Dear Abu-Dawud,
you don't use formaldehyde as such, bur a polymer, say
paraformaldehyde, which can be easily handled. When you press and
heat the wood particle layer, some depolymerization takes place and
the polymer residues and the liberated formaldehyde condense with the
lignin and other phenolic materials adhering the particles to each
other.
hopefully this helped,
Jacob
On 1 Jul 2007, at 10:36, abu dawud wrote:
> Hallo everyone,,,
> I want to ask about making particle board by reaction between
> tannin and formaldehyde. Can we change formaldehyde with another
> compound? Because we know that formaldehyde is toxic. I assume it
> can be changed by formic acid or acetaldehyde, can be..?
> If it cannot be changed, how we decrease toxic of that formaldehyde
> in particle board?
> thanks
> Yoad, Abu Dawud
>
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