| 摘要 |
The present invention is directed to compositions and methods for treating and preserving substrates, such as cellulosic materials, such as wood or plant fibres. Water insoluble biocidal compositions comprising a biocidally effective amount of a biocide formed by mixing a first biocidal compound which is a quaternary ammonium salt having the formula R<1>R<2>R<3>R<4>N<+>X<-> wherein R<1> and R<2> are independently straight, branched, or cyclic alkyl groups 8 to 18 carbon atoms, and R<3> and R<4> are independently straight alkyl groups having 1 to 7 carbon atoms or branched or cyclic alkyl groups having 3 to 7 carbon atoms, and X<-> is an anion and a second biocidal compound selected from the group consisting of alkali and ammonium salts of dialkyldithiocarbamate, monoalkyldithiocarbamate, tetrafluoroborate, and hexafluorophosphate, weherein said composition has a water solubility lower than that of said first biocidal compound are applied to the substrates as an antifungal and antimicrobial treatment. These compositions provide significant improvement over the commercial control, didecyldimethylammonium chloride, with regard to resistance to leaching. As a result, the compositions and methods of the invention are particularly suitable for treating wood to be used in an exterior environment. |
