| 摘要 |
<p>The invention relates to a method for producing composite bodies from mineral shaped bodies and foamed polyurethane layers. According to said method, the mineral shaped body is coated, in a closed mould, with a foamable polyurethane composition consisting of a polyol mixture, water, low-boiling hydrocarbons, carboxylic acids, amines, catalysts, foam stabilisers, wetting agents and dispersants, in addition to a polyisocyanate. The mould must not be preheated and during the foaming process the composition is only subjected to the inherent pressure generated in said process. In another embodiment, the foamed body is produced separately and is subsequently glued to the mineral shaped body. The composite bodies exhibit a low thermal conductivity and are suitable for use as facing slabs.</p> |
