Patent GB-957389-A (GB)
Title: A process for treating the surface of a water-insoluble solid material
Filed: 1962-06-12
Abstract: The water-repellency, corrosion resistance or dirt resistance of water-insoluble material is increased by contacting the surface of the material with a mixture of steam and an organosilane of the formula RnSi(OR1)4-n or an hydrolysate thereof, in which n is 1, 2 or 3, each R is H or a monovalent hydrocarbon radical of 1 to 30 C atoms and each R1 is methyl, ethyl or propyl.  The steam-silane mixture can be directed against the surface via a hose and nozzle, or the material to be treated can be placed in a chamber which is subsequently filled with the mixture, or the mixture may be passed in turn through several treating chambers. If desired, the material to be treated may be pre-heated, or a conventional curing catalyst may be placed on the surface to be treated. Among the materials specified are extruded, soft mud, sand-lime and aggregate bricks; drain and ceramic tile; fibreboard; asbestos; mica; concrete; stone; gravel; and cinder and cement blocks.  Examples are given.ALSO:In treating solid surfaces, a siloxane is formed in situ by mixing steam and an organosilane of the formula RnSi(OR1)4-n or a hydrolysate thereof; such as a silanol, wherein each R is H or a monovalent hydrocarbon (saturated or unsaturated) radical of 1 to 30 C atoms, each R1 is methyl, ethyl or propyl and n is 1, 2 or 3, and contacting the surface to be treated, with the mixture. If desired, a curing catalyst such as an alkyl titanate or metal carboxylate may be placed on the surface of the material to be treated. Materials specified are extruded, soft mud, sand lime and aggregate bricks; drain and ceramic tile; rubber; glass; phenolic laminates; aluminium; steel; wood; fibreboard; asbestos; mica; concrete; stone; gravel; porcelain; and cinder and cement blocks. The steam-silane mixture can be directed against the surface to be treated, or the material to be treated can be placed in a chamber which is subsequently filled with the steam-silane mixture or the mixture may be passed in turn through several treating chambers. If desired, the material to be treated may be heated prior to treatment with the above mixture. Examples are given.ALSO:The water-repellency, corrosion resistance or dirt resistance of water-insoluble material is increased by contacting the surface of the material with a mixture of steam and an organosilane of the formula RnSi(OR1)4-n or a hdyrolysate thereof, wherein n is 1, 2 or 3, each R is H or a monovalent hydrocarbon radical of 1-30 C atoms and each R1 is methyl, ethyl or propyl.  The steam-silane mixture can be directed against the surface via a hose and nozzle, or the material to be treated can be placed in a chamber which is subsequently filled with the mixture, or the mixture may be passed in turn through several treating chambers.  If desired, the material to be treated may be pre-heated, or a conventional curing catalyst may be placed on the surface to be treated.  The process is suitable for treating ceramic articles, since the steam-silane mixture can be contacted with the ceramic article while the article is cooling after being fired.  Materials specified are extruded, soft mud, sand lime and aggregate bricks; drain and ceramic tile; rubber; glass; phenolic laminates; steel; aluminium; wood; fibreboard; asbestos; mica; concrete; stone; gravel; and cinder and cement blocks.  Examples are given.