CS265885B1 - Sorption nonwoven fabric - Google Patents

Abstract

The sorbent nonwoven fabric consists by weight of 5 to 35% mineral and/or synthetic fibers, 20 to 60% powdered activated carbon, 4 to 20% phosphoric acid salts, 0.5 to 10% potassium iodide, 2 to 10% acrylate polyelectrolyte and 20 to 40% acrylate or styrene acrylate binder, which binds the fibers together and on their surface is attached sliver activated carbon, with at least 87% of the powdered activated carbon particles having a size smaller than or equal to 40 µm.

Description

265 885

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-combustible sorption nonwoven fabric for use in the manufacture of respirators, filter and filter-ventilation units for the removal of foreign matter from a gaseous environment, particularly in the power and chemical industries.

A known solution is a ventilation unit filter made of granulated or powdered activated carbon, containing some of the chemical, for example potassium iodide or tetraethylenediamine, which allow the binding of radioactive methyl iodide.

A solution is also known, protected by CSA AO No. 238 199 Sorption nonwoven fabric consists of 5 to 30% chemical fibers, 20 to 60% powdered activated carbon, up to 10% acrylic polyelectrolyte or acrylic dens and 20 to 40% acrylic or styrene acrylate binder which binds the chemical fibers with each other and binds powdered activated carbon on their surface, wherein at least 87% of the powdered activated carbon particles have a size of less than or equal to 40 / ton.

A sorption agent consisting of two components protects the CSSR AO No. 241 613. One component is a non-woven fabric with 10 to 30% polyester fibers having a fineness of 1 to 12 dtex and a length of 35 to 120 mm, and the other component is a surfactant. 60% of the total weight of the sorbent is powdered expanded perlite having a hydrophobized surface and / or powdered activated carbon, the surfactant powder being fixed to the nonwoven fiber surface by a polyacrylate binder.

The disadvantages of known loose filters made of gra-2265 885 zero or powdered activated carbon are higher manufacturing effort, limited design to thin layers of sorption materials due to higher pressure losses and higher energy consumption during operation.

A disadvantage of the known sorbent nonwoven solutions is the low efficiency of radioactive methyl iodide.

It is an object of the present invention to overcome the drawbacks of the known solutions and to provide a sorption nonwoven fabric which exhibits sorption activity on radioactive methyl iodide while meeting the requirements for the design of filter-ventilation units.

Disadvantages of known solutions of sorption nonwoven designed especially for the production of respirators, filter and sequin units for removal of radioactive methyl iodide from the gaseous environment in the power industry and from chemical workplaces removes sorption nonwoven! Lie containing 5 to 35% by weight of mineral and / or synthetic fibers, 20 to 60% of activated carbon powder, 2 to 10% of acrylate polyelectrolyte and 20 to 40% of acrylate or styrene acrylate binder which binds the fibers with each other and binds them powdered activated carbon, wherein at least 87% of the activated powdered coal particles have a particle size of less than or equal to 40 µm, according to the invention, further comprising 4 to 20% phosphoric acid salts and 0.5 to 10% potassium iodide.

The advantages of the absorbent nonwoven fabric of the present invention are high breathability, minimal pressure loss, non-flammability and any formability. The sorbent is firmly bound to the surface of the fibers so that it does not collapse. The absorbent nonwoven fabric of the present invention allows a new, simpler design of filter-ventilation units

Practical examples:

Example 1

The sorbent nonwoven for methyl iodide sorption consists of a glass mat having a basis weight of 80 gm, -2 powdered activated carbon of 100 gm, diammonium phosphate of 25 g · ® ” ² , acrylic

265 885 "2 of polyelectrolyte in an amount of 7.5 g.m. and acrylate binder -2 in an amount of 45 g ·». The sorption nonwoven fabric is nonflammable, ** 2 having a total basis weight of 260 g.m.

Example 2

Sorption nonwoven as in Example X except that styrene acrylate binder is applied instead of acrylic binder.

Example 3

The sorbent nonwoven for methyl iodide sorption is formed from a polyester staple fiber web of a fiber density of 11 dtex and 4.4 dtex in a ratio of 60/40 and a fiber length of 38 to 120 mm. The basis weight of the fleece is -2 *

120 gm. The web is reinforced by spraying two acrylic binders in an amount of 80 gm _{t on a} total basis weight of 200 gm, the potassium iodide 2 in a quantity of 45 gm and the styrene acrylate binder 2 in a quantity of 275 gm. The absorbent nonwoven fabric is nonflammable and has a total basis weight of 1300 gm.

The sorbent nonwoven fabric of the present invention may be used to remove iodine and methyl iodide from the gaseous medium in the vapor medium.

Claims (1)

Sorption non-woven fabric intended primarily for the production of respirators, filter and filter-ventilation units for the removal of radioactive methyl iodide and iodine in gaseous media, particularly in the power industry and chemical workplaces, containing by weight 5 to 35 ·% mineral and / or synthetic fibers powdered activated carbon, 2 to 10% acrylic polyelectrolyte and 20 to 40% acrylic or styrene acrylate binder that binds fibers to each other and binds powdered activated carbon on their surface, with at least 87% of the active powder particles having a particle size of less than or equal to 40 y characterized in that it contains 4 to 20% by weight of phosphoric acid salts and 0.5 to 10% of potassium iodide. Printed by Moravian Printing Works ,, Center 100, Studentská tř.5. OLOMOUC Price: 2,40 Kčs