CS273039B1 - Filtering sorption insertion piece with reduced inflammability for ozone trapping - Google Patents

Abstract

The filter sorption insert with decreased combustibility for ozone collection consists of at least one filter sorption layer. This layer is an adsorption non-woven fabric that either consists of 10 to 50 percent by weight of chemical or mineral fibres, 10 to 40 percent by weight of acrylic or styrene acrylic binding agent, 4 to 18 percent of diammonium hydrogen phosphate, 20 to 60 percent by weight of pulverised activated carbon or spherical carbon sorbent and 1 to 7 percent by weight of soda-ammonium salt or acrylic polyelectrolyte, and/or of sorption carbon fibres.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter-absorbent pad intended primarily for the capture of ozone in reproduction, testing and air-conditioning equipment and apparatus in which ozone is produced in operation.

With the increasing number of reproductive, testing and air-conditioning equipment and apparatus in which aa ozone is released and operated, 1 workplace is increasing, in which workers are exposed to the indirect effects of ozone.

For the capture of ozone, mainly absorption filters are used which use powdered or granulated activated carbon or precarbonated carbon composites. The disadvantages of bulk filters are their complicated construction, high pressure losses even at low thicknesses of pulverized or granulated coal, high flammability, pulverized coal spilling and the like. In the case of precoloured carbon coaposites, this is the other surface of the absorbent material, e.g.

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3e known absorbent nonwoven fabric, in particular for removing foreign or unwanted substances from water, sugar juices and the like, for removing unwanted odors, for removing radioactive substances, dyes, chemicals and detergents from wastewater, for cleaning galvanic baths and the like, consisting of chemical fibers, activated carbon powder, acrylate polyelectrolyte, or acrylic pleats and acrylic or atyrene acrylic binder. It contains 5 to 30% chemical fibers, 20 to 60% powdered activated carbon, 2 to 10% acrylic polyelectrolyte or acrylic dens and 20 to 40% acrylic or ethylene acrylate binder that binds chemical fibers with each other and binds powdered activated carbon on their surface wherein at least 87% of the activated powdered coal particles have a particle size of less than or equal to 40 µm.

This solution is described in the description of the invention to U.S. Pat. Its disadvantage is flammability, which makes it unusable for ozone depletion, and low efficiency.

It is an object of the present invention to provide new types of absorbent materials which overcome the above-mentioned drawbacks of the prior art and make it possible to create new designs of ozone scavenging filter sorption components.

The principle of the invention is based on the technical solution of the construction of filter-absorbent materials and their combinations, from which are created the absorbent materials suitable for the production of filter inserts of various shapes and defined absorbent effects.

The essence of the ozone scavenging filter insert having at least one filter sorption layer according to the invention is that the structural layer used is an adsorbent nonwoven fabric consisting of 10 to 50% by weight of chemical or mineral fibers, 10 to 40% of acrylate or ethylene acrylate binder, 4 to 10% diammonium phosphate dibasic, 20 to 60% powdered activated carbon or spherical carbon sorbent with 1 to 7% sodium ammonium salt of acrylic acid or an ecrylate polyelectrolyte;

The advantage of the filter-absorbent pad according to the invention is its very simple construction, low thermal formability, easy pad change, very good dynamic properties, high permeability, large functional surface. Another advantage is the self-absorbency of the filter-sorption fabric. Ozone capture efficiency is up to 99% for a long time. At an ozone concentration of 50 pphm and a flow rate of 0.5 l / min cm < 3 ^& gt ;, the 40 mm thick filter insert prevents the ozone from penetrating for several tens of hours.

It is possible to make inserts of various sizes and shapes. In the XEROX device, the cartridge of the present invention effectively absorbs ozone for the time required to make 10,000 copies. The solution according to the invention complies with the US standard for materials applicable to aircraft construction FAR 25853 (b) and similar Soviet standard NL6S 2.

Examples of specific embodiments of the filter-absorbent pad are:

CS 273 038 Bl

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Example 1

120 χ 150 x 20 mm filter-sorption insert with reduced flammability, formed by a layer of five non-combustible adsorption nonwoven webs of 233 gm ** ² formed from 32 g of PESs with a fineness of 1.7 and 4.4 dtex in a 50/50 fiber length ratio of 38 mm, of 67 g styranoacrylate binder, 100 g of activated carbon powder, 25 g of diammonium hydrogenphosphate and 8 g of soda-acrylic acid sodium.

Example 2

The filter-absorbent pad 150 mm in diameter and 20 mm thick is made up of 2 heat-treated, non-combustible, adsorptive nonwoven fabrics with a basis weight of 367 gm, which is formed from 60 g of PESs having a fiber fineness of 4.4 and 11 dtex in a ratio 40/60 with a fiber length of 38 to 120 mm, of 108 g of styranoacrylate binder, of 150 g of activated carbon powder, of 37 g of diammonium phosphate, of 12 g of acrylate polyelectrolyte.

In addition, between the two layers of the non-woven non-woven fabric, one layer of non-woven adsorption carbon fiber fabric of 100 gm ** ² is formed, which is formed by charring with subsequent activation in an inert atmosphere of 300 gm of viscose fibers.

Example 3

The filter-absorbent pad of any shape is formed from two layers of adsorbent material, which is formed from a glass fiber web of 150 gm, * -2 on which 100 gm of spherical carbon sorbent is applied, 25 g of diammonium hydrogenphosphate, 45 g of ethylene acrylate binder and 8 g of acrylate polyelectrolyte.

Between two layers of adsorbent material, one layer of nonwoven fabric 2 is made of absorbent carbon fibers having a basis weight of 100 gm, which is formed of 300 g of charring and subsequent activation of polyacrylate fibers.

Example 4

The filtration pad sorpčnl arbitrary shape is formed from two layers of carbon-ad-2 sorpčnl fabric weighing 150 g which is formed to continue _{from the} charring and activation -2 Nou viscose fabric having a weight of 375 gm.

OBJECT OF THE INVENTION

Claims (1)

Ozone-depleting filter sorption pad for use in particular for reproduction, testing, air-conditioning and other equipment and apparatus which produces ozone in at least one filter-sorption layer, such as an adsorbent non-woven fabric containing chemical fibers, powdered activated carbon , an acrylate polyelectrolyte or acrylic dye and an acrylate or styrene acrylate binder, wherein the filter layer of the filter-absorbent pad is an adsorbent nonwoven fabric, consisting of 10 to 50% by weight of chemical or mineral fibers, 10 to 40% of acrylate or styrene acrylate, 4 to 18% of diammonium phosphate, 20 to 60% of powdered activated carbon or spherical carbon sorbent, and 1 to 7% of sodium ammonium salt of acrylic acid or acrylate polyelectrolyte and / or of carbon fibers.