Filter material for cleaning hot gases
The material includes two layers containing synthetic fibers and framed canvas located between these layers, all the layers are bonded together by hypoproteinemia and saturated aqueous dispersion based on vermiculite and adhesive to the weight of dry matter of 4-8 wt.%. The obtained heat-resistant filter material. 2 C.p. f-crystals, 1 Il. The invention relates to filtration materials used for cleaning hot gases with temperatures up to 260oC.Known non-woven filter material for cleaning hot gases with temperatures up to 170oS, consisting of the outer windshield and closing of the fibrous layers of polyester fibers and an intermediate frame of a cloth fastened together (see and.with. The USSR 850152, IPC B 01 D 39/16, 30.07.81 year). The disadvantage of this material is its relatively low heat resistance.Also known nonwoven filter material for cleaning hot gases with temperatures up to 220oWith, including two fibrous layer of synthetic fibers with intermediate frame canvas between them and the covering layer facing the flow of contaminated gas that sits on top of these layers and containing a metal hair is th heat resistance, which does not allow to use it for cleaning gases with a temperature range up to 230-260oC. in Addition, the known filter material involves the use of a limited range of products synthetic fibers, the resistance of which is higher than the temperature of the cleaned gas, which in some cases leads to a higher cost of the cleanup process.The objective of the invention is to increase the heat resistance of the filter material capable of stable operation when cleaning hot gases with a temperature range up to 230-260oC.This problem is solved due to the fact that the filter material, comprising two fibrous layer of synthetic fibers and framed canvas located between these layers, bonded together by hypoproteinemia impregnated composition based on an aqueous dispersion of vermiculite and adhesive to the weight of dry matter of 4-8 wt.%, as the adhesive used is sodium silicate, and one of the outer surfaces of the material are made smooth.The fibrous layers may be made of polypropylene or polyester fibers.The invention is illustrated in the drawing and the following description.The figure schematically presents a cross soybean leaf 2 located between layers 1 and 3, bonded together by beams 4 fibers, formed on the basis of when hypoproteinemia.Material saturated aqueous dispersion based on vermiculite and adhesive to the weight of dry matter of 4-8 wt.%. Particles 5 vermiculite, fixed by adhesive, distributed in the material structure. One of the outer surfaces 6 are made smooth.The material is produced as follows. Fibrous layer 1 are sequentially laid on him the framed canvas 2 and the second fibrous layer 3 is subjected to hypoproteinemia on needle machine, which are formed beams 4 fibers, crimping between the fibrous layers 1, 3 and frame 2. The resulting intermediate product is impregnated with the aqueous dispersion of vermiculite and adhesive, which is used as sodium silicate. After impregnation carry out the drying of the material. The weight on the dry substance is 4-8 wt. %.The smoothness of the outer surface 6 of the material give, for example, processing on the calender.Particles 5 dispersed and fixed with adhesive into the fibrous layers 1, 3 and frame the canvas 2, have a high ability to reflect heat energy of cleaned hot gas stream, which significantly increases dermotocosmetolgy in the range up to 230-260oC. Often heated gases are corrosive acidic and alkaline environment, such as waste gases during sublimation from drying in the production of chalk, alumina production, chemical plants, etc. At temperatures of heated gases up to 230oIn these cases, it is preferred to use fibrous layers 1 polypropylene fibers. The content of the impregnating composition based on vermiculite and adhesive on the dry substance is 4-5% to the total mass of the material. At higher temperatures (240-260oC), for example, when cleaning of exhaust gases from heating systems, drying in the production of asphalt-concrete pavement, cement plants, etc. is preferable to use polyester fiber. The content of the impregnating composition based on vermiculite and adhesive on the dry substance is 4-5% to the total mass of the material. Framed canvas 2 is carried out predominantly of polyester filament yarn.During operation of the filter material to its smooth outer surface 4 facing the flow of the purified gas.Thanks to this construction with the outer surface prevents clogging of the material structure of polluting particles, facilitated its regeneration. 2. The filter material under item 1, wherein the fibrous layers are made of polyester fibers.3. The filter material under item 1, wherein the fibrous layers are made of polypropylene fibers.
FIELD: methods of production of electret items, electret filters and respirators.
SUBSTANCE: the invention presents a method of production of electret items, electret filters and respirators with heightened resistivity to the oil mist. The invention falls into production processes of electret items, electret packed beds and respirators, and may be used for removal of corpuscles from gases, especially for removal of aerosols from air. The method provides for: formation of a melted material consisting of a mixture of a polymer composed of a mixture of a polymer representing a non-current-conducting thermoplastic resin with a specific resistivity exceeding 1014 Ohms·cm with a fluorine compound as an additive compound; shaping it to the required form and quenching it up to the temperature lower than the melting point of the polymer. The material is calcined and treated with an electric charge to give it electret properties. The invention improves the capability of filtering oily aerosols.
EFFECT: the invention improves the capability of filtering oily aerosols.
19 cl, 16 tbl, 19 dwg, 23 ex
FIELD: methods for imparting charge to fibrous webs by means of non-aqueous liquid for usage of said webs as filters in filtering face masks for protection of user's mouth and nose.
SUBSTANCE: method involves wetting web formed from non-conductive fibers with non-aqueous polar liquid; substantially drying web for producing fibrous electronic web. Method differs from known methods of imparting charge to web in that it requires less energy for drying of web than methods using aqueous liquids. Also, many kinds of filaments poorly wetted with aqueous liquids are immediately wetted with non-aqueous liquids.
EFFECT: increased efficiency and simplified method.
12 cl, 2 dwg, 6 tbl, 26 ex
FIELD: fine-fiber filtering materials.
SUBSTANCE: the invention is pertinent to fine-fiber filtering materials used for individual means of protection of respiratory organs. The invention offers a protection material, a means of protection containing the offered material and a method of production of the fibrous material providing for electrostatic forming of the fibrous material from a solution of styrene copolymer with acrylonitrile in an organic solvent at the presence of electrostatic additives of bromide or iodide salts of tetraethyl- or tetrabutyl-ammonium. At that a solution containing an additive of a high-molecular methylmethacrylate in amount of 0.001-0.01 mass % in the capacity of dissolvent is used a mixture of ethyl acetate with butyl acetate at their mass ratio in the solution from 1/9 up to 9/1 accordingly. The invention allows to produce a material with improved mechanical characteristics and to provide stability of the production process.
EFFECT: the invention ensures production of the material with improved mechanical characteristics and stability of the production process.
5 cl, 2 tbl, 1 ex
FIELD: fine filtration of air; cleaning ventilation emissions from oil mist; cleaning air in venting pipe lines of gas-transfer unit oil tanks.
SUBSTANCE: proposed filter includes filter element with filter medium made from coarse and fine fibers laid in between outer and inner cylinders, cover and bottom. Filter medium is made from longitudinal and transversal oil-resistant synthetic (polypropylene) fibers; ratio of mass of longitudinal and transversal fibers is equal to (6-8) : 1 and ratio of diameters of thin and coarse fibers is equal to (0.5-1) : 10.
EFFECT: enhanced efficiency of cleaning at considerable increase of service life, oil return coefficient; enhanced ecological safety around compressor stations.
2 cl, 2 dwg
FIELD: filtering materials for liquid and gaseous fluids.
SUBSTANCE: filtering material is made of thermoplastic polymeric fibers. The density of material increases downstream, whereas the diameter of fibers decreases downstream. The inner layer of the material has areas the density of fibers in which is lower than the averaged density of upper layers by a factor of 2-6.
EFFECT: enhanced strength.
1 dwg, 1 tbl
FIELD: polymer materials and gas treatment.
SUBSTANCE: invention relates to polymeric fibrous filter materials designed for effective cleaning of air stream due to realization of mechanical and electrostatic filtration. Material suitable for use in respiratory masks contains (i) a layer in the form of cloth 1 mm thick made from polypropylene fibers with diameter 0.5-1.5 μm, packaging density 0.25-0.30 g/cm3, and electric charge with surface density 17-21 nCl/cm2, the layer being made by aerodynamic atomization of melt and electrization of fibers in corona discharge field during their formation, and (ii) an additional layer in the form of non-electrized cloth 1 mm thick made from polypropylene fibers with diameter 10-20 μm and packaging density 0.25-0.30 g/cm3, which is placed on the side directly facing air stream to be cleaned, the two layers being attached to each other by spot weld. Presence of two layers results in separate but complementary realization of mechanical and electrostatic filtration.
EFFECT: enhanced air cleaning efficiency and prolonged lifetime of filter material.
FIELD: methods and devices used for production of fibrous electret linen.
SUBSTANCE: the invention is pertaining to methods and devices used for production of fibrous electret linen. The method of giving of an electrostatic charge to the fibrous non-woven linen provides that the fibrous linen is soaked with a wetting liquid, then it is saturated with a water polar liquid and dried. The gained dry product represents an electret, which may be efficiently used in the air filters, for example, in respirators.
EFFECT: the invention ensures production of a fibrous electret linen, which may be efficiently used in the air filters, for example, in respirators.
13 cl, 3 ex, 5 tbl, 4 dwg
FIELD: chemical industry; oil refining industry and other industries.
SUBSTANCE: the invention is pertaining to production of materials for the filtering water-separating elements used in devices for purification of organic fluids, predominantly, hydrocarbon fuels, oils, oil products from the emulsified water and mechanical impurities, and may be used for purification of aircraft and car fuels in chemical industry, oil refining industry and other industries. The porous reinforced material is produced out of a permeable in all directions polymeric material with a side-porous deep structure having a total porosity of no less than 50 % with the sizes of the elementary pores, predominantly, of 10 - 200 microns. At that the porous reinforced material is formed out of a framed material having filaments or fibers with a diameter, predominantly, of 5 - 400 microns, and an arranged between the above mentioned filaments or fibers filler manufactured out of a porous polyvinyl formal produced by the method of a dew-point structurization with the thermal treatment of a homogenized in water composition containing at least polyvinyl alcohol and aldehyde. The element for the screen-water-separator contains a filtering-coagulating septum embraced by a perforated shell rings and limiting from above and from below covers. At that the septum is made multilayered out of a sheet manufactured out of the above porous reinforced material. The technical result consists in an increased effectiveness of purification of fuels (jet engine fuels and diesel fuels) and the gaseous oil products from water, and also asphalt-resinous and sulfur-containing materials, an increased service life and productivity of the filtering screens based on the indicated filtering-coagulating material.
EFFECT: the invention ensures an increased effectiveness of purification of jet engine fuels, diesel fuels, gaseous oil products from water and also asphalt-resinous and sulfur-containing materials, service life and productivity of the filtering screens based on the filtering-coagulating material.
13 cl, 3 dwg
FIELD: methods of production of filtering materials.
SUBSTANCE: the invention is pertaining to the methods of production of filtering materials, in particular, to the method of production of the filtering fibrous materials, which may be used in a means of individual protection. The filtering fibrous material is produced by an electrostatic formation of a non-woven fibrous material from a working polymeric fiber-forming solution with dynamic viscosity of 1-30P, electrical conduction of 10-4-10-7 ohm-1 cm-1 in an electrostatic field at a potential difference from 10 up to 150 kV. The solution contains in the capacity of the polymer from 8.9 up to 24.6 mass % of styrene copolymer with 5.2-30.4 mass of acrylonitrile or triple styrene copolymer with 5.2-30.4 mass of acrylonitrile and 3.7-42.1 mass % of methyl methacrylate. As a dissolvent they use ethyl acetate, or butyl acetate either their mixture. The solution in addition contains high-molecular polymethyl methacrylate, a distilled water, the lowest alcohol taken from the group ethyl alcohol, methyl alcohol or isopropyl alcohol, at the following contents of ingredients of the polymeric fiber-forming solution, in mass %: polymeric compound - 8.9-24.6; high-molecular polymethyl methacrylate - 0.011-0.02; distilled water - 0.01-0.1; the lowest alcohol - 17-28; dissolvent - the rest. The efflux of the working polymeric fiber-forming solution is exercised at the volumetric speed of 0.1 up to 6 cm3 /minute. Feeding of the working polymeric fiber-forming solution is conducted from the space interval of 12-42 cm beginning from the point of its coming out from the batching device up to the settling surface. The produced filtering fibrous material contains a technological and a working layers made out of the polymeric fibrous material produced by the above described method. The technological layer material has the surface density of 1-3 g/m2 and is made out of fibers of 3-5 microns diameter. The working layer material is made out of fibers of 1.5-3 microns diameter. The double-layer material has the surface density of 32-38 g/m2, the standard resistance of 0.8-1.2 mm of the water column and the skip coefficient of no less than 95 %. The invention ensures an improved quality of the filtering material due to an increase of efficiency of penetration of fragments with a diameter of 0.3 microns at the standard resistance of 1.0 mm of the water column.
EFFECT: the invention ensures an improved quality of the filtering material, an increased efficiency of penetration of fragments with a diameter of parts of microns at the standard resistance of 1 mm of the water column.
4 cl, 2 ex
FIELD: natural gas industry; petrochemical industry; oil-producing industry; other branches of industry; methods of production of filtering materials and the filters for purification of gases and aerosols.
SUBSTANCE: the invention offers the filtering material made out of the polysulfone fibers with different diameter of the fibers produced by electromolding from the solution in the organic solvent with addition of an electrolyte; and the frame design filter supplied with the produced material having the density of 30 - 50 g/m2. The invention ensures the effective filtration of the aerosol particles at the high thermostability of the filter.
EFFECT: the invention ensures the effective filtration of the aerosol particles at the high thermostability of the filter.
5 cl, 1 tbl, 1 dwg