| 摘要 |
Quaternary ammonium carbonates having the formula wherein R1 is a C1-C20 alkyl or aryl-substituted alkyl group and R2 is a C8-C20 alkyl group have been synthesized. These compounds and compositions further comprising the corresponding quaternary ammonium bicarbonate wherein R1 is the same or a different C1-C20 alkyl or aryl-substituted alkyl group and R2 is the same or a different C8-C20 alkyl group and/or the corresponding quaternary ammonium metal carbonate wherein R1 is the same or a different C1-C20 alkyl or aryl-substituted alkyl group; R2 is the same or a different C8-C20 alkyl group and M is a non-coupler metal, are prepared by reacting two reactants, a C1-C20 alkyl or aryl-substituted alkyl, C8-C20 alkyl quaternary ammonium chloride and a metal hydroxide, in a solvent comprising a C1-C4 normal alcohol. The amount of metal chloride reactant is that amount sufficient to yield the C1-C20 alkyl or aryl-substituted alkyl, C8-C20 alkyl quaternary ammonium hydroxide, a metal chloride, and optionally unreacted metal hydroxide. The resultant quaternary ammonium hydroxide and any unreacted metal hydroxide are then reacted with carbon dioxide to yield the quaternary ammonium carbonate and optionally metal carbonate. Also provided is a method for preserving a wood substrate. Accordingly, the substrate is treated with a metal coupler-free wood preservative system comprising a biocidal effective amount of the carbonate quats above, preferably those prepared by the method above, and a solvent.
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