Filter medium and preparation method thereof

Abstract

The invention relates to a filter medium, in particular to a filter medium and a preparation method thereof. The preparation method is as follows: raw materials are taken according to the weight percent of a formula, are added with materials to be mixed and stirred evenly according to the prescribed steps, and then are formed by extrusion and punch in a prefabricated mold, and the forming body is dried and cured at certain temperature to form the filter medium. Absorbing raw materials such as activated carbon, kaolin, diatomaceous earth and the like, and a water based binder such as polyvinyl alcohol, sodium carboxymethyl cellulose, modified starch and the like adopted by the invention are of nontoxic and non-harmful raw materials, and are formed by extrusion and punch under the condition of normal temperature, and in the process of high-temperature curing, water can remove the blockage of the binder for micropores of the absorbing raw materials in the process of extrusion or punch when evaporating, so that the finished product keeps the original absorption characteristics of the absorbing raw materials and simultaneously overcomes the defects that medium raw materials are precipitated when the filter medium is used for filtering.

Description

technical field [0001] The invention relates to a filter medium, in particular to a filter medium and a preparation method thereof. Background technique [0002] At present, with the increasing environmental pollution, the pollution of air and water seriously threatens human life. Purifying air, purifying domestic water and industrial water has become a problem that people generally pay attention to. Air purifiers, water purifiers, etc. are flourishing under such circumstances. [0003] At this stage, the core component filter media used in air purifiers and water purifiers (that is, what people usually call filter elements) are mainly divided into three categories: the first category is a single interception medium, such as PP cotton, ultrafiltration membrane, reverse osmosis membrane, etc.; the second type is a single adsorption medium, such as granular loose carbon, ceramsite, granular molecular sieve, etc. The third category is a filter medium that integrates adsorptio...

AI Technical Summary

Problems solved by technology

This kind of filter medium not only has compact and uniform pore size formed on the surface, and the filtration precision can be adjusted according to the amount of pore-forming agent added, it effectively overcomes the problems of precipitation of the filter medium, desorption of impurities and gap filtration during the filtration process, and the water The base adhesive forms a large amount of gas during the evaporation and drying process of water, and dredges the clogged micropores on the surface of the filter raw material, so that the finished product maintains the original adsorption property. At the same time, powder can also be used in the production process. The filter material is used to increase the adsorption specific surface area of ​​the filter material per unit volume, which greatly improves the overall filtration effect of the filter medium. At the same time, the production cost of the water-based adhesive is low, safe and environmentally friendly.