| 摘要 |
The invention concerns the oilproofing and waterproofing treatment of construction materials by applying to them a composition which comprises by weight: (A) from 0.1 to 25% of a fluorinated copolymer formed from (1) 5 to 70% of a fluorinated ester of the formula: <IMAGE> (I) in which Rf represents a perfluoro-alkyl radical, Q represents an oxygen or sulfur atom, W represent a bivalent linkage, one of the symbols R represents a hydrogen atom and the other a hydrogen atom or an alkyl radical, (2) 4 to 50% of a monomer of the formula: <IMAGE> (II) in which R' represent a hydrogen atom or an alkyl radical and R' represents an alkylene radical and (3) 0 to 91% of any other monomers' (B) from 2 to 25% of a polyisocyanate or isocyanate prepolymer; (C) from 0.1 to 10% of a catalyst; and (D) one or more diluting solvents to make up to 100%. This composition, which confers waters repellency, oil repellency, anti-graffiti and anti-billposting properties, stable towards ageing and weathering on the materials treated, may also be used as a mold-removing agent for pieces of concrete cast in a concrete mold. |
