Depth filter from nonwoven self-supported material

FIELD: ventilation.

SUBSTANCE: depth filter of a non-woven self-supported material consists of polymeric supporting fibers with microsize diameters and embedded in the supporting fibers of polymeric filter fibers with nanoscale diameters. The supporting fibers form a coherent three-dimensional filter cage. The filter fibers in the filter capacity are distributed in such a way that their density in the filter capacity is different and increases from the surface of the filter facing the incoming flow of the medium to be cleaned to the surface of the filter through which the medium to be purified exits.

EFFECT: consistent high quality of air or gas purification for a long time.

5 cl, 3 dwg

 



 

Same patents:

FIELD: medicine.

SUBSTANCE: group of inventions relates to medicine. Described is a method of delivering a medicinal active agent, which includes a stage, at which an individual medicinal product is introduced to a mammal, requiring useful effects for health or treatment of the health state. The product contains one or more filaments, which contain a base material, the medicinal active agent and optionally aesthetic agents, volume-adding means, plasticisers and cross-linking agents.

EFFECT: product is strong during transportation and can contain a wide range of medicinal active agents and aesthetic agents.

37 cl, 6 dwg, 7 ex

FIELD: process engineering.

SUBSTANCE: set of inventions relates to porous membrane, separator for electrochemical device including said porous membrane and said separator and to method of its production. porous membrane contains cellulose fibres wherein the latter are produced from the mix of over 50 wt % of initial material first cellulose fibres with surface area defined by staining with "congo red" dye and making 250 m2/g or more and 500 m2/g or less; and less than 50 wt % of second cellulose fibres with surface area defined by "congo red" staining and making 150 m2/g or more and less than 250 m2/g.

EFFECT: better properties, acceptable costs.

28 cl, 1 tbl, 8 ex

FIELD: chemistry.

SUBSTANCE: method of manufacturing a fibre-containing element includes the following stages: supply of fibres, at least, some of which are the first fibres, for instance: mineral fibres, polymer fibres, cellulose fibres or other types of fibres, in an amount from 3 wt % to 98 wt % of the total weight of initial materials in the form of an accumulated covering; supply of a binding agent in an amount from 1 wt % to 30 wt % of the total weight of the initial materials, subjection of the accumulated covering from the fibres to the process of the fibre untangling; weighing the fibres in the main air flow; mixing the binding agent with the fibre before, during or after the process of the fibre untangling; supply of the filling agent, for instance, a fire retardant, in an amount from 1 wt % to 55 wt % of the total weight of the initial materials; addition of the filling agent at any suitable stage of the method realisation, for instance, before, during or after the process of the fibre untangling; accumulation of the mixture of fibres, the filling agent and the binding agent and pressing and thermal fixation of the mixture to obtain a consolidated composite material with a density from 120 kg/m3 to 1000 kg/m3.

EFFECT: claimed method can be used to manufacture homogenous composite materials.

11 cl, 2 dwg

FIELD: process engineering.

SUBSTANCE: fibres blown from the melt can make up to 45-99 wt % of the web while impregnating material can make 1-55 wt % of the web. Said fibres can be composed of thermoplastic composition including at least one copolymer of propylene and α-olefin, their ratio making 60-99.5 wt % of propylene and 0.5-40 wt % of α-olefin. Said copolymer can feature density of 0.86-0.90 grams per cubic centimetre while said composition can feature melt fluidity rate of 200-6000 g in 10 minutes measured at 230°C in compliance with ASTM Test Method D1238-E. Moulded web can be 3D-shaped with the help of, for example, 3D-forming surface. For example, this web can be used as a core of sanitary towel.

EFFECT: nonwoven web with matrix of fibres blown from the melt and impregnator.

20 cl, 8 dwg

FIELD: textiles, paper.

SUBSTANCE: nonwoven fabric comprises: a nonwoven base web consisting of cellulose fibres in an amount of at least about 50 wt %; cellulose fibres comprising softwood fibres having Canadian Standard Freeness, at least about 350 ml; conductive fibres in an amount from about 5 wt % to about 15 wt %. The conductive fibres comprise carbon fibres having the purity of at least about 85%, at that the pulp fibres are mixed with the carbon fibres. The main web has the tensile strength in the longitudinal direction of at least 5900 grams-force (which corresponds to 57.9 N), the base weight is less than about 40 g·m-2, the voluminosity is less than about 1 cm3/g, the resistance is less than about 100 ohm/square. At that the basic web comprises water-resistant material and is non-embossed. The carbon fibres have the length from about 1 mm to about 6 mm. The method of manufacturing the conductive paper web comprises applying the aqueous suspension of fibres onto the porous forming surface to form a wet web, smoothing the web, drying and cutting the web into a plurality of bands having the width of about 3 mm to about 10 mm. Each band is wound crosswise onto the bobbin.

EFFECT: creation of conductive elements is provided for use in moisture indicators without the use of metal-containing materials.

20 cl, 10 dwg, 2 tbl

FIELD: machine building.

SUBSTANCE: invention described fibrous composite material intended to be used as insulating material, which includes high-efficiency polymer fibres characterised by fusion temperature or glass transition temperature at least of 200°C and heat conductivity of solid phase of not more than 0.7 W/(mK), and binding fibres. Content of high-efficiency polymer fibres comprises at least 70 wt % while content of binding fibres does not exceed 30 wt %. Fibrous composite material has density of 50 to 300 kg/m3, which is measured at load in the direction perpendicular to the plane of the main fibre orientation of 1 mbar to 1000 mbar, as well as layered location of fibres, at least some part of which is connected to each other at contact points that can be created owing to softening of binding fibres and high-efficiency polymer fibres have cross section of out-of-round shape. Besides, the application describes a heat insulation system that includes the above fibrous composite material.

EFFECT: combination of high insulating efficiency of the corresponding systems with ease and simplicity of their processibility.

33 cl

FIELD: textiles, paper.

SUBSTANCE: non-woven fabric and method of its formation provide for the formation of generally flat or plain self-supporting core of inorganic base fiber and organic binding fiber, preferably using an aerodynamic web-forming head. In some preferred versions, the organic base fiber has the fiber strength with the rupture load of about 10 g or less and an elongation of about 20 percent or less. Preferably, the organic binding fiber has a binding component and a structural component in single fiber filaments. In one aspect, the structural component of the organic binding fiber has a composition effective to ensure its strength, thus, a non-woven fabric can be cut manually with minimal effort.

EFFECT: in this form the non-woven fabric is suitable to act as an acoustic ceiling plate.

10 cl, 2 dwg

FIELD: electrical engineering.

SUBSTANCE: electric fabrics contain a mixture of thermoplastic resin and an additive promoting charging. The additive promoting fabrics charging includes a heterocyclic imide material free of fluorated groups. The electretic fabrics production method involves the following stages: providing a thermoplastic material and an additive promoting charging and including a heterocyclic imide material free of fluorated groups, stirring the thermoplastic material and the additive promoting charging in the melt to produce a thermoplastic mixture, the fabrics forming and the fabrics electrostatic charging. One ensures production of electretic fabrics with additives promoting fabrics charging. Such additives promoting charging allow to produce electretic fabrics that may be easily charged using a number of various charging mechanisms such as tribocharging, direct current corona discharge, hydrocharging or their combination. Fabrics prepared from the mixture may have a form of films or unwoven fibrous fabrics.

EFFECT: unwoven microfibrous fabrics are suitable for use as electretic filtering materials.

25 cl, 5 tbl, 4 ex

FIELD: textiles, paper.

SUBSTANCE: method of production of canvas in one version comprises the stages: preparing a mixture comprising a thermoplastic resin and processing aid containing N-substituted amine hindered succinimide oligomer, stirring the mixture in the melt, and the melt viscosity of the mixture of the processing aid and the thermoplastic resin is lower than the melt viscosity of the thermoplastic resin without processing aid and forming the canvas of molten mixture. Also a second version of the method of manufacturing an electret canvas is provided, comprising the stages: preparing a mixture of a thermoplastic resin and processing aid containing N-substituted amine hindered succinimide oligomer, stirring the mixture in the melt, forming the canvas of molten mixture and electrostatic charging of the canvas. The electret filter material comprises microfiber nonwoven canvas comprising a mixture of thermoplastic resin and an additive that promotes charging, containing N-substituted amine hindered succinimide oligomer. This provides processing of polymer olefin materials used in production of products of hot melt extrusion, namely polymer canvas, which include film and non-woven fiber canvas, and also polymer canvas in the form of electret products, especially film for food, air filters, filtering protective masks, respirators and electrostatic elements used in electro-acoustic devices, such as microphones, headphones and electrostatic recording devices.

EFFECT: co-administration of a thermoplastic resin and a processing aid in the form of N-substituted amine hindered succinimide oligomer provides facilitation of canvas forming.

25 cl, 4 tbl, 26 ex

FIELD: textiles, paper.

SUBSTANCE: sheet 2 based on microfibre structure comprises microfibers 1 the diameter of each of which is no more than 3000 nm, and is formed from a mixture which is insoluble in water but soluble in alcohol of resin based on acetated polyvinyl alcohol and insoluble in water but soluble in alcohol of fluorine-based resin. The invention enables to create a sheet to use it as a filter with high filtration characteristics with respect to oil mist.

EFFECT: creation of the sheet based on microfibre structure for use it as a filter.

8 cl, 2 tbl, 5 dwg

FIELD: chemistry.

SUBSTANCE: first step includes obtaining low-hydroxylated insoluble fullerenols by reacting concentrated fullerene solution in o-xylene with aqueous ammonia solution in the presence of a tetrabutylammonium hydroxide phase-transfer catalyst at 35-40°C. At the second step, the obtained low-hydroxylated insoluble fullerenols are hydroxylated to transform them into a water-soluble form by mixing with 6-15% aqueous hydrogen peroxide solution and heating for 4-5 hours at 65°C. Water-soluble fullerenols are then precipitated from an alcohol-containing solution.

EFFECT: simplifying the method while preserving quality characteristics and full extraction of the end product.

2 cl, 1 dwg, 4 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to nanotechnology, particularly a method of producing aspirin nanocapsules in a carrageenan envelope. The disclosed method includes preparing an aspirin suspension in benzene; dispersing the obtained mixture into a carrageenan suspension in butanol in the presence of an E472c preparation while mixing at 1000 rps; adding tetrachloromethane; filtering the obtained nanocapsule suspension and drying at room temperature.

EFFECT: method provides a simpler and faster process of producing nanocapsules and increases mass output.

1 dwg, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to encapsulation, particularly to a method of producing albendazole nanocapsules in a sodium alginate envelope. The disclosed method includes adding albendazole to a sodium alginate suspension in hexane in the presence of an E472c preparation while mixing at 1000 rps. The weight ratio of albendazole and sodium alginate is 1:3 or 3:1. Further, 1,2-dichloroethane is added. The obtained suspension of nanocapsules is filtered, washed and dried. The process of producing the nanocapsules is carried out at 25°C for 20 minutes.

EFFECT: invention provides a simpler and faster process of producing nanocapsules, reduces losses during production thereof (high mass output).

3 ex, 1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to encapsulation, particularly a method of producing resveratrol nanocapsules in an envelope made of low- or highly esterified apple or citrus pectin. According to the disclosed method, resveratrol is dispersed in a suspension of low- or highly esterified apple or citrus pectin in benzene in the presence of an E472c preparation while stirring at 1000 rps. Tetrachloromethane is then added. The obtained suspension of nanocapsules is filtered and dried. The process of producing the nanocapsules is carried out at 25°C for 10 minutes.

EFFECT: invention provides a simpler and faster process of producing nanocapsules, reduces losses during production thereof (high mass output).

9 ex, 1 dwg

FIELD: nanotechnology.

SUBSTANCE: according to the invention method, albendazole is added to the suspension of sodium alginate in butanol in the presence of the preparation E472s when stirring at 1000 revolutions per second. The mass ratio of albendazole and sodium alginate is 1:3 or 3:1. Then acetonitrile is added. The resulting suspension of the nanocapsules is filtered, washed, and dried. The process of production of nanocapsules is carried out at 25°C for 20 min.

EFFECT: simplification and acceleration of the process of production of nanocapsules, reduction of losses in their production.

1 dwg, 2 ex

FIELD: chemistry.

SUBSTANCE: according to the method a suspension of resveratrol in heptane was dispersed into a suspension of xanthan gum in butanol in the presence of E472c under stirring at the rate of 1000 rev/s. A mixture of benzene and water taken at a volume ratio of 5:1 or 3:1 was added to the said suspension. The resulted suspension of nanocapsules was filtered, washed and dried. The process was performed at a temperature of 25°C within 10 min.

EFFECT: simplified and fast process of nanocapsule production, reduced process losses.

4 ex, 2 dwg

FIELD: nanotechnology.

SUBSTANCE: suspension of aspirin in benzene is produced. The resulting mixture is dispersed into suspension of sodium alginate in butanol in the presence of the preparation E472s when stirring at 1000 rpm/sec. Then chloroform is poured, the resulting suspension of nanocapsules is filtered and dried at room temperature.

EFFECT: simplification and acceleration of the process of production of the nanocapsules, and increase in the yield by weight.

1 dwg, 4 ex

FIELD: medicine.

SUBSTANCE: invention represents a method for preparing a sterile nanoemulsion of perfluororganic compounds (PFOC) involving: adding a PFOC mixture to an aqueous solution of a stabilising agent; homogenising the PFOC mixture with the aqueous solution of the stabilising agent to produce a PFOC pre-emulsion; mixing the PFOC pre-emulsion with a salt-water solution to produce the PFOC nanoemulsion; keeping the PFOC nanoemulsion at a temperature from 2 to 10°C for at least 18 hours. The method can be also implemented as follows: pre-filling a circulation loop of a PFOC nanoemulsion generating plant with the aqueous solution of the stabilising agent; adding the PFOC mixture to the aqueous solution of the stabilising agent; homogenising the PFOC mixture with the aqueous solution of the stabilising agent to produce the PFOC pre-emulsion; mixing the PFOC pre-emulsion with the salt-water solution to produce the PFOC nanoemulsion.

EFFECT: higher stability of the PFOC emulsion and prolonging the storage life.

30 cl, 7 ex, 5 tbl, 1 dwg

FIELD: nanotechnology.

SUBSTANCE: shell of the nanocapsules is used as apple or citrus high- or low-esterified pectin, and the core - as L-arginine. According to the inventive method, L-arginine is suspended in benzene, the resulting mixture is dispersed into a suspension of apple or citrus high- or low-esterified pectin in benzene in the presence of the preparation E472s while stirring 1000 revolutions per second. Then carbon tetrachloride is added, the resulting suspension of the nanocapsules is filtered and dried at room temperature. The process is carried out for 15 minutes.

EFFECT: simplification and acceleration of the process of producing the nanocapsules, and increase in the yield by weight.

6 ex

FIELD: nanotechnology.

SUBSTANCE: method of production of nanocapsules of vitamin in sodium alginate is characterized in that the shell is used as sodium alginate, and the core - as the vitamin, in a weight ratio of core:shell as 1:3. According to the method of preparing the nanocapsules the vitamin is added to a suspension of sodium alginate in benzene in the presence of the preparation E472s while stirring at 1300 rev/sec. Then hexane is added, the resulting suspension is filtered and dried at room temperature.

EFFECT: simplification and acceleration of the process of production of the nanocapsules, and increase in the yield by weight.

3 dwg, 8 ex

FIELD: medicine.

SUBSTANCE: method for producing involves applying metal silver on the surface of sintepon filaments and transforming silver into chloride or silver oxide. The transformation process is ensured either by processing the material with sodium hypochloride, or by anodic electrolytic processing.

EFFECT: producing the effective filter material having high antimicrobial activity.

2 cl, 6 dwg, 1 tbl, 3 ex

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