Method for making composite sheet sorbent

FIELD: medicine.

SUBSTANCE: method involves as follows. Electroformed nonwoven fibrous polymer fabric is impregnated with aqueous or aqueous-alcoholic suspension of aluminium material particles then hydrolysed by heating the suspension impregnated fabric that is impregnated by suspension spraying over its surface. The heating process in performed in the open air at relative humidity at least 70%, preferentially 95-100% of at least two stacked suspension impregnated fabrics. Upon termination of hydrolysis process, plane parallel wringing of the fabrics follows.

EFFECT: improved performance of a sorbent owing to formation of the composite sheet sorbent involving uniform distribution of porous particles of oxide-hydroxide aluminium phases over the entire volume of the fabric, formation of the sheet sorbent fabric of uniform thickness and density.

7 cl, 2 ex, 1 tbl

 

The invention relates to the production technology of the sorption filter materials.

A method of obtaining electropolishing sorbent [US 6838005 B1, 2005], in which non-spherical particles of aluminum oxide obtained by the method of electrical wire explosion mixed with the second solid component particles of fibrous material and then carry out a reaction mixture with an aqueous solution with the formation of non-spherical particles of aluminum oxide and from obtained after hydrolysis mixture by paper technology form a sheet of filter material with sorption properties.

The disadvantages of the thus obtained filter material can be attributed to the irregularity and instability properties due to technological factors, which negatively affects the water treatment process as a whole.

The lack of a "paper" technology of filter materials is the inability to obtain an absolutely uniform in density of the material without through pores or holes of sufficiently large diameter. This increases the likelihood of leakage of contaminants through these pores, which reduces the efficiency of the material. When mixing particles of substantially different sizes, for example nanopowder and other large fibers, it is extremely difficult to get one who odny on the composition of the layer.

The closest technical solution is a method for filtering material [RU 2317843 C1, 2008], which comprises applying on the basis of non-woven polymeric fiber material particles of the material based on aluminum by immersing it in an aqueous or aqueous-alcoholic suspension of the above particles, effecting hydrolysis of the particulate material based on aluminum with the formation of the fibers basics particles of hydrate of alumina, is used as a base nonwoven polymeric fibrous material obtained by the method of electrotorture, the hydrolysis is carried out by heating the impregnated suspension of the material, and after hydrolysis of the filter material is washed with water to remove not established on the fiber basics particles of hydrate of aluminum oxide. Finally the filter material obtained by adding a few leaves to obtain the required thickness.

This method is free from the above disadvantages of analogue, but the impregnation by immersion leads to the absorption of large quantities of liquid non-woven polymeric fabric, increase its mass to the critical values exceeding the value of the breaking length. This makes it difficult to manipulate the filter material, can lead to deformation and even rupture of the blade when it is moved. P and impregnation by immersion is filtered suspension: the inner layers of nonwoven material saturated with a dispersion - water, and the dispersed phase powder, in excess localized in the upper layers of the material. The result is a procurement inhomogeneous impregnation suspension volume.

Present in the prototype, the operation of washing with water to remove not entrenched particles caused by impregnation and leads to additional strain.

In addition, the prototype centrifuge carry out one layer of fabric, which is then dried and placed in several layers to obtain a multilayer sheet suitable for use as filter material In this way, we don't get a homogeneous monolithic sheet of filter material. The extraction of each individual sheet before drying cloth leads to the appearance of shear deformation in the material and uneven formation density of the material, which ultimately leads to deterioration of performance properties of the composite sheet sorbent.

The objective of the invention is the formation of a composite sheet of the sorbent with a uniform distribution throughout the volume of the canvas porous particles of the oxide-hydroxide phases of aluminum, as well as the formation of a cloth sheet sorbent uniform thickness and density.

The technical result is an improvement of operational properties of the sorbent.

The task is achieved by Thu the, as is known, the proposed method of manufacturing a composite sheet sorbent comprises the impregnation of the fabric from nonwoven polymeric fibrous material obtained by the method of electrotorture, aqueous or aqueous-alcoholic suspension of particles of a material based on aluminum, and the implementation of the hydrolysis of the particulate material based on aluminum by heating the impregnated suspension of the canvas.

What's new is that the impregnation of the fabric from nonwoven polymeric fibrous material obtained by the method of electrotorture, carried out by spraying the suspension on the fabric surface, while the heat produced in air at a relative humidity of at least 70%, preferably 95-100%, of at least two stacked stacked impregnated with the suspension of the paintings, and after completion of the hydrolysis is carried out of their plane-parallel spin cycle.

In addition, as the particles of material based on aluminum using the powder composition of the aluminum-aluminum nitride percent, Al/A1N from 95:5 to 5:95, preferably 60%:40% and a specific surface area of not less than 8 m2/g, preferably 19-27 m2/g obtained by electrical explosion of wire.

It is advisable that the spraying of the suspension is carried out at a temperature not exceeding 20°C.

It is preferable that the content of the powder composition of aluminum which is a nitride of aluminum in water is 0.8-1.2 wt.%

It is desirable that the heat-soaked suspension canvas carried out in a furnace or in a drying Cabinet at a temperature of 80-120°C.

In addition, the plane-parallel spin folded stack of paintings carried out in vacuum conditions.

It is preferable that the degassing is carried out before the value of-0.8 psi for not less than 2 minutes.

For impregnation of the fabric from nonwoven polymeric fibrous material by a method of spraying an aqueous or aqueous-alcoholic suspension of nano-sized powder particles on the basis of aluminum using, for example, nozzles serves two purposes: first, it regulates the flow of nanosized powder on the basis of aluminum, in order to obtain the optimum amount of sorbent (porous particles formed from nanofibers oxide-hydroxide phases of aluminum) on the fibers of the base; secondly, to control fluid flow (water or water-alcohol solution)to provide the necessary level of humidity during the hydrolysis in the furnace is not less than 70%, but insufficient to cause deformation and decrease in strength of the sheet basics - non-woven material made of thin polymer fibers obtained by the method of electrotorture, so-called tissue (filters) Petryanov.

Simultaneous uniform spraying the suspension on the surface of the fabric is achieved by the use of a number of nozzles. The use of nozzles which allows you to make a good forced impregnation material in area and volume. When dipping (immersion) this is not achieved due to the fact that the suspension should constantly stirring vigorously to maintain its uniformity (homogeneity).

Because the amount of water in the canvas is limited due to the use of nozzles, the humidity in the oven hydrolysis of paramount importance. If the drying speed will be faster than the process of hydrolysis, the hydrolysis will not have time to go through and nano-sized powder of aluminum irreversibly oxidized in air without the formation of nanofibers oxide-hydroxide phases of aluminum and, therefore, will not acquire sorption properties. When humidity is less than 70% hydrolysis is virtually no [Porous composites based on oxide-aluminum cermet (synthesis and properties) / Softyou etc. - Novosibirsk: Publishing house of SB RAS, branch "geo", 2004, p.56-57]. The humidity in the oven hydrolysis is provided with respect to the ratio between the volume of the cavity and the volume of downloaded material with a certain humidity and lack of messages internal volume of the furnace with the atmosphere.

When spraying the slurry through a nozzle is regulated consumption of aluminum nanopowder in such a way that it is not formed of excess particles, which then must be removed by washing.

The operation plane-parallel spin allows to form a composite multi-stakeholder who euny sheet filter material (sorbent) with a uniform thickness over the entire area of the sheet and a uniform density and the absence of shear deformation in the material structure.

Under plane-parallel wringer in this case refers to mechanical dewatering (centrifuge) paintings using two parallel flat surfaces corresponding to the size of the canvas, providing a uniform force over the entire area of the canvas.

In the usual ways of getting a flat layered materials - laminating and calendering is the stretching of the sheet material through heated rolls. Thin microfiber material, such as material obtained by the method of electrotorture (Petryanov filters), capable of significant elongation under load, especially when wet. When forward movement of the formed laminate inevitably formed between the rollers of the air cavity between the layers of material that are then folds, creases, etc. that leads to uneven density of the obtained laminate.

When plane-parallel spin, first, is pressed on the entire surface of the material at the same time and, secondly, through the entire volume of the multilayer preform. Moreover, you can adjust the speed of the load. Experimentally it was found that the optimal multilayer workpiece from a nonwoven polymeric fibrous material obtained by the method of electrotorture, will be gradual on ruzena (vacuuming) the compressed material to-0.8 MPa for at least 2 minutes. At high speed vacuum increases the probability of receiving low-quality material: the formation of large pores, the overlying material through its thickness, the heterogeneity of the distribution of the oxide-hydroxide phases of aluminum on the area and volume of the sheet.

When the wringer rolls (two rolls or roll on the substrate) will be observed flow (Val) suspension, ahead of the current swath (swath). A significant part of the suspension "slips" between the layers, increasing the heterogeneity of the distribution of the particles of the oxide-hydroxide phases aluminium powder on the area and volume of the workpiece.

The method is as follows.

Example. 1

Pre-prepare a suspension of 20 liters of distilled water and 200 g of the powder composition of Al/AlN obtained by electrical explosion of wire, with a specific surface area of 21 m2/year In capacity with the obtained suspension is placed (dip) 16 canvases in size from 900 to 1,500 mm Petryanov filter brand AFP - 15-2,0 and leave for 30 minutes to soak. Impregnated with a slurry of cloth placed on 8 pallets, stacking two on each other, and placed in a drying oven (oven), which maintain humidity of 100% and a temperature of 110°C. by heating the billet to a temperature of 57°C, the reaction begins hydrolysis accompanied by release of small amounts of ammonia and in Dorada and discoloration of the workpiece from black to white in the transformation of Al/AlN in the hydrate of alumina white. At the end of the hydrolysis pallets remove from the oven, remove them with a cloth and carried out by extraction using rolls. In the pressing process occurs dehydration and crushing paintings. The result is 8 sheets of composite two-layer material. Data on surface density and content of the porous particles of the oxide-hydroxide phases of aluminum in the table.

Example 2.

Pre-prepared suspension of 20 liters of distilled water and 200 g of the powder composition of Al/AlN obtained by electrical explosion of wire, with a specific surface area of 21 m2/g is fed to the spray system - the number of nozzles equally spaced on the FCA - 15-2,0 - cloth Petryanov filter size from 900 to 1,500 mm Sputtering is carried out at increased pressure and temperature in the spray system 20°C. Receive 16 impregnated with the suspension of the paintings that are placed on pallets, stacking on two paintings at each other, and placed in an oven, in which support 100% humidity at a temperature of 110°C. by heating the billet to a temperature of 57°C, the reaction begins hydrolysis accompanied by release of small amounts of ammonia and hydrogen and discoloration of the workpiece from black to white in the transformation of Al/AlN in the hydrate of alumina white. At the end of the hydrolysis pallets remove from the oven, snime is with them cloths and implemented by the plane-parallel spin paintings while gradually lowering the pressure up (-0,8) ATM for at least 2 minutes using a special designed equipment vacuum-squeezing style. In the pressing process occurs dehydration and crushing paintings. The result is 8 sheets of composite two-layer material. Data on surface density and content of the porous particles of the oxide-hydroxide phases of aluminum in the table.

The table below shows the particle content of the hydrate of aluminum oxide (Al2O3) and the surface density of different sections of a sheet of filter material obtained according to examples 1 and 2.

Place of sampling from a sheet of materialThe content of Al2O3, % wt.Surface density, g/m
For example 1For example 2For example 1For example 2
The upper left edge18,724,8375375
Upper right edge26,325,1375377
The middle left 27,225,0411378
The middle right25,824,8382375
The lower left edge19,524,9373375
The lower right edge26,525,2369376

The table shows that a more uniform distribution of surface density and content can be achieved using the example 2.

1. A method of manufacturing a composite sheet sorbent comprising soaking the fabric from nonwoven polymeric fibrous material obtained by the method of electrotorture, aqueous or aqueous-alcoholic suspension of particles of a material based on aluminum, and the implementation of the hydrolysis of the particulate material based on aluminum by heating the impregnated suspension cloth, characterized in that the impregnation of the fabric from nonwoven polymeric fibrous material obtained by the method of electrotorture, carried out by spraying the suspension on the surface the ti leaf, thus the heat produced in air at a relative humidity of at least 70%, preferably 95-100%, of at least two stacked stacked impregnated with the suspension of the paintings, and after completion of the hydrolysis is carried out of their plane-parallel spin cycle.

2. The method according to claim 1, characterized in that particles of the material based on aluminum using the powder composition of the aluminum-aluminum nitride in the percentages of Al/AlN from 95:5 to 5:95, preferably 60%:40% and a specific surface area of not less than 8 m2/g, preferably 19-27 m2/g obtained by electrical explosion of wire.

3. The method according to claim 1 or 2, characterized in that the content of the powder composition of the aluminum-aluminum nitride in water is 0.8-1.2 wt.%.

4. The method according to claim 1 or 2, characterized in that the spraying of the suspension is carried out at a temperature not exceeding 20°C.

5. The method according to claim 1, characterized in that the heating of the impregnated suspensions of at least two sheets is carried out in a furnace or in a drying Cabinet at a temperature of 80-120°C.

6. The method according to claim 1, characterized in that the plane-parallel spin, at least two stacked a pile of paintings carried out in vacuum conditions.

7. The method according to claim 6, characterized in that the degassing is carried out to values of 0.8 ATM. for at least 2 minutes



 

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