| 摘要 |
<p>1476183 Catalyst unit support coated products MINNESOTA MINING & MFG CO 30 Aug 1974 [31 Aug 1973] 38084/74 Headings B1F and B2E [Also in Divisions Cl, D2 and F2] An intumescent sheet material comprising from 30-85% by wt. of expandable mica, from 0 to 60% by wt. of inorganic fibrous material and from 10 to 70% by wt. of inorganic binder is used in the mounting of catalystimpregnated ceramic cores in automobile exhaust catalytic converters. The sheet material may be formed by papermaking techniques or by coating or extruding a slurry of the materials on sheet material e.g. kraft paper, plastic film e.g. polyethylene terephthalate film, glass mat, or fabric of organic or inorganic fibres. The ceramic core may also be coated directly with the slurry. The substrate on which the materials are coated may be provided with a low-adhesion sizing so that it can be separated from the intumescent sheet material. The expandable mica may be unexpanded vermiculite, hydrobiotite, or waterswelling tetrasilicic fluorine mica. The inorganic fibrous material may be asbestos, glass fibres, refractory filaments e.g. zirconia-silica, alumina, alumino-silicate fibres, or metal filaments. The inorganic binder may comprise water-swellable tetrasilicic fluorine mica, asbestos montmorillonite or kaolinite and may include small amounts of polymers and elastomers e.g. natural or synthetic rubber latices. In use, the sheet material is arranged between a ceramic core and an outer container, and the assembly is heated e.g. to 600‹C to exfoliate the sheet, thereby causing the core to be securely mounted in the container.</p> |
