COMPOSITION AND METHOD OF PRODUCING POROUS PVFM-BASED FILTER Russian patent published in 2012 - IPC B01D39/16 B01D39/14 C08L29/04 C08L29/14 C08K3/24 C08K5/01 C08K5/07 

FIELD: process engineering.

SUBSTANCE: invention relates to filters intended for separation of inhomogeneous systems, in particular, to fabrication of filtration PVFM-based materials to be used in cleaning fluids and gases of water, mechanical impurities and biological contaminants. Composition for filter fabrication includes the following components, in wt %: polyvinyl alcohol - 5-20, porophore - 2-10, paraformaldehyde cross-linking agent - 2-15, catalyst - 1-15, water making the rest. Porophore mat represent a mix of starches with average grain size, or mix of starch with dextrin. Preset amount of polyvinyl alcohol is diluted in water. It is heated to 75-95°C with continuous mixing. Porophore suspension in cold water is added to obtained solution and kept at 55-80°C for 15-30 min with continuous mixing. Preset amount of cross-linking agent is added thereto and mixed for 10-30 min. Preset amount of catalyst is added thereto at 30-40°C and mixed for 10-20 min. Obtained reaction mix is poured in the mould, kept in temperature controlled cabint at 55-80°C for 5-20 h. Produced element is withdrawn from said mould, washed of catalyst and porophore. Drying is carried out at 15-25°C and, then, at 30-50°C to constant weight.

EFFECT: simplified process, possibility to vary filter porosity, reduced contamination.

4 cl, 4 tbl, 16 ex