| 摘要 |
The present invention relates to a special method of preventing substrate colour changes when impregnating porous inorganic substrates, by first applying to the target substrate surface a primer composition, drying and curing the primer system, the substrate surface acquiring hydrophobic and oleophobic properties such that drops of water applied thereto evaporate before they penetrate into the substrate and a drop of n-decane likewise applied thereto and left to act for 30 seconds can be removed, without the drops leaving dark spots on the substrate surface, and then carrying out the impregnation. The present invention further relates to the use of fluoroalkyl-modified and/or fluorofunctional acrylate systems or fluoroalkyl-/aminoalkyl-/alkoxyand/or hydroxy-functional siloxane systems or fluoroalkyl-functional silane and/or siloxane systems or mixtures of at least two of the aforementioned substances or solutions thereof in water and/or alcohol as primers for preventing substrate colour changes in the case of architectural preservation by impregnation.
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