摘要:
The surfaces of building materials, including marble, stone, sandstone, tiles, and cement mixes, and articles and structures manufactured therefrom are protected against atmospheric and polluting agents by applying thereto a protective agent consisting of a vinylidene fluoride polymer or copolymer comprising 55-100 mole % of vinylidene fluoride, 0-45 mole % of hexafluoropropene and 0-30 mole % of tetrafluoroethylene. Such polymers or copolymers are, preferably applied onto the surface to be protected in the form of solutions in volatile solvents.
摘要:
The present invention relates to a process for the protection of stone materials, marble, bricks and concrete, and of structures made from such materials, from the decay caused by atmospheric agents and pollutants or by mural writings with paints, inks and the like. The process comprises applying to the surface of said materials or structures a mixture which comprises:
1) polytetrafluoroethylene in the form of a fine powder; 2) a perfluoropolyether not bearing functional groups and/or 3) a perfluoropolyether or a fluoropolyether having one chain end, or both chain ends, constituted by functional groups which are capable of forming a chemical and/or physical bond with the material to be protected.
摘要:
The present invention relates to a process for the protection of stone materials, marble, bricks and concrete, and of structures made from such materials, from the decay caused by atmospheric agents and pollutants or by mural writings with paints, inks and the like. The process comprises applying to the surface of said materials or structures a mixture which comprises: 1) polytetrafluoroethylene in the form of a fine powder; 2) a perfluoropolyether not bearing functional groups and/or 3) a perfluoropolyether or a fluoropolyether having one chain end, or both chain ends, constituted by functional groups which are capable of forming a chemical and/or physical bond with the material to be protected.
摘要:
Fluoroelastomeric compositions based on vinylidene fluoride, having a high adhesion to metals in the vulcanized state, and characterized in that they contain small amounts of chlorotrifluoroethylene which is present as a comonomer of an elastomeric copolymer of vinylidene fluoride in a mixture of fluoroelastomers or in one single fluoroelastomer.
摘要:
Vulcanization of fluoroelastomers based on vinylidene fluoride, by means of a polyhydroxyl aromatic compound, a divalent metal compound of basic nature, and an accelerator consisting of a salt of ammonium or of phosphonium or of quaternary amino-phosphonium in which the anion is a complex of a Cd or Zn or Ni or Pb halide.