METHOD FOR PRODUCTION OF POROUS MATERIAL Russian patent published in 1998 - IPC

FIELD: production of nontoxic material which provides primary, clarifying and sterilizing purification of liquid; manufacturing of filters for purifying liquid and gaseous material; encapsulation of repellents, toxic chemicals and aromatic principle. SUBSTANCE: formation of porous material is carried out of composition which comprises aqueous suspension of cellulose and filler. Mixture of thermoplastic polymer (its quantity being 0.5-9.0 mass %) having particles sized 0.01-0.315 mm with mineral filler (its quantity being 40-65 mass %) having predetermined granulometric distribution of is used as mentioned above filler. Formed material is dehydrated by evacuation and compressed under pressure. Then drying within 10-20 min at 80-90 C is carried out, the process is followed by heat treatment within 10-20 min at fusion point of polymer. Before drying one of side may be covered by latex having concentration at least 10 %. EFFECT: improved efficiency of the method. 3 cl, 1 tbl