Ceramic prod. prepd. at low temp. - by agglomeration of clay materials with thermo-hardening high polymer

摘要

In the process used to make a ceramic prod. by agglomeration at low temp. of clayey materials and a thermo-hardening high polymer of the type urea-formaldehyde, melamine-formaldehyde, phenol-formaldehyde, 50-80 parts powdered material of clay origin, which is a mixt. of kaolin and mineral prods. which do not contain hydroxyl radicals, are first mixed, dry, with 10-50 pref. 15-25 parts powdered polymer. 3-15 Parts H2O are then added, and the semi-moist mixt. obtd. is shaped directly under a heating pressure at 190 degrees C and 5-35 pref. 10-20 kg/cm2 pressure, without passing through an intermediate drying stage. The mineral prod. free from hydroxyl radicals is, e.g., quartz, silico aluminate roasted at high temp., ground natural rock, clinker of Portland cement, silico-aluminous flying ash, of granule size 10-250 mu.