HEAT-RESISTANT NANOFIBRE FILTER MATERIAL AND METHOD FOR PRODUCTION THEREOF Russian patent published in 2014 - IPC B01D39/16 B82B3/00 

FIELD: chemistry.

SUBSTANCE: heat-resistant nanofibre filter material has an internal working layer and two external protective layers placed on both sides of the working layer. The working layer is made by electrical forming from polydiphenylene phthalide fibre with diameter of 200-400 nm and has mass per unit area of 0.5-3.5 g/m². Protective layers with mass per unit area of 6-8 g/m² are made from nonwoven quartz material with fibre diameter of 1-7 mcm. Electrical forming of nanofibres of the working layer is carried out in an electric field with strength of 2-6 kV/cm from polydiphenylene phthalide in cyclohexanone, which contains an additive selected from tetraethylammonium and tetrabutylammonium halides. The nanofibres formed are deposited on a substrate made of protective nonwoven quartz material, after which a second protective layer of the same nonwoven material is deposited on the working layer. The disclosed method can be carried out using devices for electrocapillary techniques of electrical forming or devices for electrical forming techniques with a free surface Nanospider™.

EFFECT: invention provides effective gas cleaning at high temperatures.

6 cl, 1 tbl, 2 ex