Filtering and sorbing material

FIELD: means of protection.

SUBSTANCE: invention relates to production of a filtering and sorbing material used in the means of personal respiratory protective equipment to cleanse the air form fumes and aerosols of hazardous substances. The filtering and sorbing material containing polypropylene fibers filled with microatomised carbon, fibers of sulfate unbleached cellulose and fibers of mercerised cellulose is obtained by adding the polypropylene fibers in the amount 5-10% of the total mass at the stage of grinding the sulfate unbleached cellulose after which combined grinding of the mixture is continued until the grinding degree of 282SHR is reached, the mixture is then mixed with the fibers of mercerised cellulose and carbon, paper web is poured dried and treated with an impregnating solution containing nickel chloride (II) - 10%, ferrous chloride (III) - 10%, copper chloride (II) - 10%.

EFFECT: production of elestic well draped filtering and sorbing material with high mechanical and adsorbtion characteristics and a low aerodynamic resistance to respiration.

1 tbl, 1 dwg

 

The invention relates to industry pulp and paper industry, in particular the production of filtersource material used in the means of individual protection of respiratory organs (RPE) for treatment of air, vapors, and aerosols of chemical substances (EROTIC), namely ammonia, chlorine, hydrogen cyanide, CYANOGEN, amine, compounds of thioethers (sulfides), etc.

Known filter material for respiratory protection mainly from toxic airborne substances (patent RU 2151628 S1). Composition for the manufacture of filter material comprises a mixture of super fine grain glass fibers of various diameters, cotton cellulose and activated carbon in the amount of 20-30 wt.%.

The main disadvantages of the filter material on the basis of super fine grain glass fibers is significant resistance to air flow (from 63 to 74 PA)that do not meet modern requirements to the RPE, and the lack of sorption capacity of the material in the introduction of sorbent from 20 to 30 wt.%.

Also known filtersarray element made in the form of facial masks and consisting of stacked layers. Filtersarray element contains layers of woven and non-woven activated carbon fibers. The layers are separated from each other by particles containing thermoplastic material, n is an example of polyvinyl chloride, polyethylene and activated carbon, and is connected to at least one of the adjacent layers. Filtersarray element may have a layer of glass fiber as a reinforcing - mesh canvas cotton (application No. 1476761, UK, MCI 01D 46/00, 48/10, 46/52).

Used in this facial mask as adsorption layer of the adsorption fabric of activated carbon fibers characterized by high sorption properties. However, this fabric has a low strength, which complicates its use in the manufacture of laminated materials, and significant cost adsorption fabric unacceptable when creating ripm wide application in conditions of disaster.

Besides the weak side of this facial mask is the consolidation of the sorbent (activated carbon) using polymer compounds, which leads to the loss of sorption capacity and a sharp decrease in physiological and hygienic properties.

Closest to the proposed material to the technical essence and the achieved result is filtersarray material (prototype) for personal respiratory protection against vapors and aerosols EROTIC containing cellulose fibers, filled with fine activated carbon and sized binder (patent RU 2281798 C2).

A method of manufacturing this material includes himself preparation of the composition of a mixture of pulp unbleached sulphate with the degree of grinding of 282SR and mercerized cellulose with the introduction of the mass of activated carbon blending, the sizing composition of the binder, the sheen of the material and drying it.

The main disadvantages of sorbing material of the prototype is its lack of strength and elasticity, which in practice reduces the life of the finished products - respirators, protective hoods and other respiratory devices.

In addition, despite the large range of hazardous chemicals, from which this material provides protection when using it in the RPE remains an open question provide protection against sulfur-containing compounds, in particular compounds of thioethers (sulfides).

Technical result achieved in the claimed invention is to obtain a flexible, well-kupiruema filterservice material for ripm with high physical-mechanical and adsorption properties at low aerodynamic resistance to breathing.

Filtersarray material made known in the pulp and paper industry by way of unbleached sulphate pulp with the introduction of a mass of fine coal and binder.

According to the proposed method of obtaining material the problem is solved by the introduction at the stage of grinding unbleached sulphate pulp (degree of grinding of 202SR) polymer fibers in an amount of 5...10% of the total mass of the composition is ultrasaurus material. Then continue grinding until 282SR.

High adsorption properties filterservice material is provided by using as the absorbent (up to 45 wt.%) mechanical mixture of fine coal-catalyst KT and gas coal type SKT, distributed and recorded in the amount of material in the volume of coal-catalyst type CT to the volume of gas coal type SKT how to 1.15:3,5, or as 3:1, and the processing of the paper web impregnating solution containing a mixture of catalysts and chemo-sorbents on the basis of halides of metals of variable valence - chloride Nickel (II), iron (III), copper (II).

The difference of the invention from known is:

1. The presence in the composition filterservice material polymer (polypropylene) fibers, adding which occurs at the stage of grinding unbleached sulphate pulp.

2. Impregnation filterservice material with a solution of a mixture of catalysts and chemo-sorbents on the basis of halides of metals of variable valence.

Adding in the composition of polypropylene fibers at the stage of grinding unbleached sulphate pulp is very important, as this provides a good tachycardia polymer fibers (splitting on thinner fibrils) and the uniform distribution in coal-cellulosic mA the CE. Joint with pulp refining polymer fibers on the degree of grinding of 202 to 282SR was possible to optimize the process of their introduction upon receipt filterservice material.

With the introduction of polymer fibers in roll simultaneously with unbleached sulphate pulp from the start grinding (the degree of grinding 15...16SR) and joint grinding to achieve the degree of grinding of 282SR significantly increased the density of the material and, accordingly, the aerodynamic resistance to air flow, which is unacceptable for ripm.

The introduction of polymer fibers at the end of the grinding does not allow the fibers evenly distributed in the coal-cellulose mass. When this fiber distributed beams, which leads to sticking of the leaf to the hot surface when thermoplastically and, in General, degrades the quality filterservice material.

Impregnation filterservice material with a solution of a mixture of catalysts and chemo-sorbents on the basis of halides of metals of variable valency allows us to give the material a high sorption properties with respect to the pairs of compounds thioesters. It is known that due to the unsaturation of the sulfur atom of the sulfide can form with halides of metals of variable valence complex compounds, representing crystalline products which are not soluble in water. This exacerbated the government allows us to consider the halides of metals of variable valency as the active chemo-sorbents for vapor recovery thioesters.

Impregnation filterservice material, the concept of which is shown in the drawing, was carried out in a drying section of paper machine Voith ebb coal-cellulose composition, a weak pressing and drying at a temperature of 80...95C. Leaf material (1), passing through the right rollers (2), is fed into the impregnation zone (3) impregnating refreny shaft (4)which rotates the canvas material due to tension, and then to the drying cylinder (5). The volume of the impregnating solution in the impregnation bath (6) is 7 liters, the concentration of the impregnating solution - 30%, including: chloride Nickel (II) - 10%, iron chloride (III) is 10%, the chloride copper (II) - 10%. In the impregnation weight of catalysts on filtrasorb the material is about 3%.

Then the material is subjected thermoplastically on smooth hot cylinder heated at a temperature of 180...200C and a minimum pressure of 0.1...0.2 kgf/cm2. The main objective of thermoplastically at minimum pressure (0.1...0.2 kgf/cm2- warm up without the pressure of the compressed fabric material up to 180...200C, thereby creating the conditions for binding of the hot-melt fibers. When this material is given elasticity, flexibility, good drape, which is very important for the manufacture of respiratory devices of various configurations of respirators, Capu the ones etc.

Used in the manufacture of filtersource material added to the composition of polymer fibers at the stage of grinding unbleached sulfate pulp, and the impregnation of the material with a solution of a mixture of catalysts and chemo-sorbents on the basis of halides of metals of variable valence of scientific and technical literature authors unknown.

The evaluation of the properties of the proposed sample filterservice material was carried out according to approved methods.

Time of protective action pairs ammonia, chlorine, hydrazine, dimethylamine and thioesters were determined on a model package of materials of the following composition:

the covering layer;

sorption layer;

hygienic layer.

As a sorption layer was tested in a sample of the proposed material.

The results of the tests of protective and physico-mechanical properties of the inventive material, as well as the values of the relevant material properties of the prototype are given in the table.

Due to the fact that the composition of the material of the prototype may contain different proportions of components (see the description of the material of the prototype), for comparison characteristics in the table for the material of the prototype shows the interval of possible values.

Table
Protective and physico-mechanical properties filtersarray materials
The indicators characterizing the prototype and the claimed materialMaterial-prototypeDeclare filtersarray material
The mass of 1 m, g127...131129
Thickness, mm0,49 0,46...0,49
Destructive force when stretching in the machine direction, N7,7...12,214,5
Blagorodnost, %29...3030
Resistance to airflow, PA...3,9 2,93,0
Time of protective action pairs EROTIC, min,
source material:
ammonia5...1715
chlorine49...730
dimethylamine15...3025
hydrazine10...2525
dimethyldisulfideLess than 1031
tylenchidLess than 1028
Time of protective action pairs EROTIC, min,
material after 120 hours operating socks:
ammonia----14
chlorine----61
dimethyldisulfide----27
tylenchid----24
Note:
1. Acting concentration EROTIC, mgl-1taken in accordance with GOST R 22.9.09.-05:
ammonia-0,1;
chlorine - 0,36;
dimethylamine - 0,2;
hydrazine - 0,04.
2. Influencing the concentration of dimethyl sulfide and tylenchida was 0.1 mgl-1.
3. "----" indicates no data.

As follows from the table, filterservice materials have similar values of mass 1 m, thickness and resistance to breathing. While the claimed material is characterized by a higher strength properties and provides effective protection against vapors EROTIC. When this protective properties of pairs of ammonia, chlorine, hydrazine, dimethylamine claimed material is at the level of the prototype, and pairs of thioethers is much superior. In addition, it should be noted that the inventive material retains its protective properties (with a small decrease) and after performance socks for 120 hours, which indicates a high physico-mechanical properties and good elasticity.

The main advantage of the proposed invention is to provide a flexible, well-kupiruema filterservice material for ripm with high mechanical and adsorbs nimi properties at low aerodynamic resistance to breathing. The use of non-selective sorbent reinforced catalysts and sorbents on the basis of the chlorides of Nickel (II), iron (III), copper (II), provides high adsorption properties, and the introduction of coal-cellulose composition polypropylene fibers at the stage of grinding unbleached sulphate pulp provides high mechanical properties claimed filterservice material.

The method of obtaining filterservice material to clean the air of harmful gases, vapors and aerosols, including the refining of cellulose fibres unbleached sulfate to the degree of grinding of 282 SR, and their mixture with mercerized cellulose fibers, fine coal-catalyst KT and gas coal type SKT, low tide of the obtained composition and drying the obtained paper web, wherein upon reaching the degree of grinding of cellulose fibres unbleached sulfate equal to 202 SR, carry out the introduction of polypropylene fibers in the amount of 5-10% by weight of the total mix of substances and continue joint grinding to the degree of grinding of 282 SR, obtained after drying the paper web impregnated with a solution containing 10% of Nickel chloride (II), 10% iron chloride (III) and 10% copper chloride (II), followed by thermoplasticity.



 

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4 cl, 2 ex

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EFFECT: the invention ensures the effective filtration of the aerosol particles at the high thermostability of the filter.

5 cl, 1 tbl, 1 dwg

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