| 摘要 |
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 75-95C with continuous mixing. Porophore suspension in cold water is added to obtained solution and kept at 55-80C 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 30-40C and mixed for 10-20 min. Obtained reaction mix is poured in the mould, kept in temperature controlled cabint at 55-80C for 5-20 h. Produced element is withdrawn from said mould, washed of catalyst and porophore. Drying is carried out at 15-25C and, then, at 30-50C to constant weight. ^ EFFECT: simplified process, possibility to vary filter porosity, reduced contamination. ^ 4 cl, 4 tbl, 16 ex |
