Coating for decontamination of toxic chemical compounds

Abstract

To provide a decontamination coating intended for trapping toxic chemical compounds and ensuring good reproducibility of a decontamination phase.SOLUTION: A decontamination coating (100) includes a multilayer structure, the multilayer structure including a support (1), a trapping layer (3) intended to be brought into contact with toxic chemical compounds so as to trap them, and a holding film (4) intended to maintain a shape of the support (1) in a plane and in a direction transverse to the plane during formation of the trapping layer (3). A method for manufacturing the decontamination coating (100) is also described.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the field of decontamination of surfaces contaminated with toxic chemicals. In particular, the present invention relates to a decontamination coating intended to capture toxic compounds. In a second aspect, the present invention relates to a decontamination device comprising the decontamination coating and a dedicated packaging. In a third aspect, the present invention relates to a method for manufacturing the decontamination coating. The toxic chemical may be an organophosphorus compound, and the present invention may be applied to the decontamination of media containing organophosphorus compounds. For example, the present invention may be applied in certain environments such as the chemical industry and agriculture, as well as in fields such as combat gas attacks, such as gases derived from G-type or V-type organophosphorus compounds.

[0002] These compounds may be included in insecticide, pesticide, and even chemical warfare formulations, and typically take the form of water-based, oily organic compounds that, when released into the environment, have half-lives in water of 5 to 80 hours, although their hydrolysis products in water can remain toxic for 30 to 60 days. [Background technology]

[0003] Given their toxicity, much research has been conducted to develop effective solutions to the dangers of organophosphate compounds. One focus of this research is to find systems to capture and / or decompose these compounds to rapidly inactivate them. These decontamination systems are generally in the form of liquids or powders, sprays, or even hydrogels that absorb toxic chemical agents by natural dispersion and mixing.

[0004] However, although these decontamination systems are effective, they require improvement to ensure good reproducibility of the decontamination phase. In fact, when used in gel, spray or powder form, they do not achieve an ideal and uniform application amount on the surface to be treated. In a work environment, users are not sure that the amount of decontamination agent used is sufficient, and they tend to use more decontamination material than is actually necessary. Summary of the Invention [Problem to be solved by the invention]

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve at least one of the above problems. [Means for solving the problem]

[0006] To this end, the present invention provides, inter alia, a decontamination coating for capturing toxic chemicals (e.g., Type G or Type V warfare organophosphorus compounds) by containment and isolation by covering a contaminated surface with the decontamination coating. a support, in particular a porous and flexible support, a capture layer provided on top of the support, the capture layer being intended to contact and capture toxic chemicals, for example by adsorption and / or chemical decomposition; a support film fixed to the underside of the support opposite the upper surface, the support film being intended to maintain the shape of the support in and across the plane during formation of the capture layer; It has a multi-layer structure including:

[0007] The decontamination coating thus constructed is easy to use and ensures highly reproducible and reliable decontamination results. The presence of a support allows the active substance to be deposited in a reproducible manner and amount and can be used in the form of pre-adjusted layers. The presence of the opacifying substance in a multi-layer structure allows for adequate coverage of the contaminated surface, especially by contacting the entire contaminated surface. The nature and amount of the constituent materials are optimized to obtain optimal effectiveness, especially by confining or isolating the organophosphorus compounds.

[0008] Use of the decontamination coating involves simple contact by placing the decontamination coating on a contaminated surface, where the contaminants are very quickly reduced or even completely removed.

[0009] The retention film is "intended to maintain the shape of the support in the plane and transverse to the plane" means that the retention film can prevent deformation of the support in the plane and transverse to the plane.

[0010] One possibility is that the retaining film is a hydrophobic film that does not adhere to the surface onto which the decontamination coating is placed during manufacturing and handling steps during the step of placing the coating on the surface to be decontaminated.

[0011] The retaining film may be, for example, a Teflon® or silicone film, which allows the decontamination covering to be rolled up on itself for packaging or transport on-site.

[0012] According to one configuration, the capture layer comprises: Depositing a capture layer precursor solution onto the support surface of the support. Polymerize the precursor solution The hydrogel layer is formed by the precursor solution containing at least one protic solvent, such as water, at least one monomer having an (alkyl)acrylic, (alkyl)acrylate or (alkyl)acrylamide group, at least one crosslinking agent having at least two groups selected from an (alkyl)acrylic, (alkyl)acrylate or (alkyl)acrylamide group, at least one photopolymerization initiator, and at least one chemical selected from an alkali halide, an alkali phosphate, an alkali sulfate, and a mixture thereof.

[0013] The trapping layer, resulting from the polymerization of the above-defined monomers and crosslinkers, traps a liquid phase containing the drug therein. When the liquid phase contains water as the protic solvent, the polymeric material can be referred to as a hydrogel material.

[0014] In other words, a hydrogel material is a material in the form of a gel consisting of a polymer maintaining an aqueous phase, typically derived from the polymerization medium (i.e., the medium in which the polymerization of the polymers constituting the hydrogel material took place), which in the present case absorbs an organophosphorus compound. Due to the flexibility of the polymer network constituting the hydrogel, such materials are able to absorb a mass of water that is typically more than 100 times the mass of the polymer structure, in the present case at least 5 times the mass of the polymer structure.

[0015] The step of forming the hydrogel layer may be carried out by irradiation with radiation that initiates photopolymerization due to the action of a photoinitiator, also referred to herein as a crosslinker. This radiation preferably belongs to the ultraviolet range, i.e., has at least one wavelength within the ultraviolet range (i.e., wavelengths between 350 nm and 420 nm). The intensity of the radiation is preferably between 1,000 and 10,000 W / m 2 The radiation may be of natural origin (e.g., exposure to natural sunlight) or artificial, e.g., radiation from a UV lamp. For example, a light source that can be used in the context of the present invention is a light source with a wavelength of 405 nm and a power of 9,000 W / m applied to a precursor deposited on a support. 2 The UV lamp may be a UV lamp.

[0016] The hydrogel layer acts as a trapping material for toxic chemicals initially present on the surface being decontaminated. Note that due to the reactivity of organophosphate compounds, organophosphate compounds captured in the gel may be spontaneously decomposed in situ.

[0017] The term "solution" identifies a homogeneous liquid mixture of the above components, meaning that all of the components are soluble in the substantial solvent of the solution.

[0018] "Protic solvent" identifies a polar solvent that has at least one hydrogen atom that is likely to participate in hydrogen bond formation. A particularly desirable protic solvent in the present invention is water, in which case the solution of the present invention may be referred to as an aqueous solution.

[0019] The protic solvent, such as water, may be present in the precursor solution in a volume ratio of 40 to 60% based on the total volume of the solution.

[0020] The (alkyl)acrylic group, (alkyl)acrylate group, and (alkyl)acrylamide group respectively have the following meanings. ·(Alkyl)acrylic group means an acrylic group or an alkylacrylic group (i.e., an alkyl group is present on the carbon bearing the double bond and the -CO- group). (Alkyl)acrylate group means an acrylate group or an alkylacrylate group (i.e., an alkyl group is present on the carbon bearing the double bond and the -CO- group). An (alkyl)acrylamide group means an acrylamide group or an alkylacrylamide group (i.e., an alkyl group is present on the carbon bearing the double bond and the -CO- group). Examples of an alkyl)acryl group, an (alkyl)acrylate group or an (alkyl)acrylamide group are, respectively, a (meth)acryl group, a (meth)acrylate group or a (meth)acrylamide group.

[0021] Examples of an (alkyl)acrylic group, an (alkyl)acrylate group or an (alkyl)acrylamide group are, in turn, a (meth)acrylic group, a (meth)acrylate group or a (meth)acrylamide group.

[0022] As mentioned above, the precursor solution of the present invention comprises a monomer having at least one (alkyl)acrylic group, (alkyl)acrylate group or (alkyl)acrylamide group. Such a monomer can be represented by the formula (I): [ka] where: R1 is -OR' (R' represents a hydrogen atom or an alkali element (e.g., sodium or potassium)), -OR3 (R3 represents an alkyl group preferably containing 1 to 4 carbon atoms (e.g., a methyl group, an ethyl group)), or -NR4R5 (R4 and R5 independently represent a hydrogen atom or an alkyl group preferably containing 1 to 4 carbon atoms (e.g., a methyl group, an ethyl group)).

[0023] R2 represents a hydrogen atom or an alkyl group, preferably containing 1 to 4 carbon atoms (eg, a methyl group, an ethyl group).

[0024] Advantageously, the monomers of the invention comprise an (alkyl)acrylamide group. Such monomers have the formula (II) [ka] where: R4 and R5 are as defined above, R2 is as defined above.

[0025] In particular, the monomer of formula (II) may be a monomer such as N,N'-dimethylacrylamide, in which R2 is a hydrogen atom and R4 and R5 represent methyl groups.

[0026] The monomer may be present in the precursor solution in a volume ratio of 40 to 60% based on the total volume of the solution, for example, when the monomer is N,N'-dimethylacrylamide, it may be present in the precursor solution in a volume ratio of 47.8% based on the total volume of the solution.

[0027] The precursor solution of the present invention also contains at least one cross-linking agent, which comprises at least two groups selected from (alkyl)acrylic groups, (alkyl)acrylate groups, or (alkyl)acrylamide groups. In other words, the cross-linking agent may be, for example: At least two (alkyl)acrylic groups at least two (alkyl)acrylate groups At least two (alkyl)acrylamide groups at least one (alkyl)acrylic group and at least one (alkyl)acrylate group at least one (alkyl)acrylic group and at least one (alkyl)acrylamide group at least one (alkyl)acrylate group and at least one (alkyl)acrylamide group It means that the compound has the following structure.

[0028] Advantageously, the crosslinking agent comprises at least two (alkyl)acrylate groups and has formula (III) [ka] where: R6 and R7 are, independently of one another, a hydrogen atom or an alkyl group, the alkyl group for example containing 1 to 4 carbon atoms (for example a methyl group, an ethyl group). n corresponds to the number of repeats of the unit in parentheses and ranges from 1 to 15.

[0029] For example, a cross-linking agent that can be used in the precursor solution of the present invention may be a chemical of formula (III) in which R6 and R7 are methyl groups, i.e., this chemical corresponds to polyethylene glycol dimethyl acrylate.

[0030] It is entirely possible to use multiple distinct cross-linking agents, provided they fall within the definition of the agent of formula (III) defined above.

[0031] It is also understood that crosslinkers are distinct from the monomers used in the precursor solutions of the present invention.

[0032] In particular, polyethylene glycol dimethyl acrylate with an average molecular weight of 750 g / mol can be used, which corresponds to a mixture of molecules having formula (III) defined above, with an average repeat number of ethylene glycol units of 13.2. The crosslinker may be present in the precursor solution in a volume ratio of 1 to 5% relative to the total volume of the solution.

[0033] In the case of the polyethylene glycol dimethyl acrylate mixture described above, the mixture may be present in the precursor solution at a volume ratio of 1.6% relative to the volume of the total solution.

[0034] Finally, the precursor solution contains at least one photoinitiator (also called photoinitiator). Such initiators are capable of generating free radicals when exposed to suitable radiation (e.g., UV radiation between 350 nm and 420 nm). The radicals thus generated react with reactive moieties present in the solution (here, polymerizable groups of the monomers and crosslinkers), resulting in the polymerization of these substances. Advantageously, the initiator is soluble in at least one component of the precursor solution (e.g., a protic solvent).

[0035] The photoinitiators preferably used in the precursor solution of the present invention may be aromatic ketones, such as 1-hydroxy-cyclohexylphenyl ketone (also known as IRGACURE® 184 or CPK®), or (phenylphosphonyl)bis(mestylmethanone) (known as IRGACURE® 819), or a mixture of these two photoinitiators.

[0036] The photoinitiator may be present in the precursor solution in an amount of 1 to 15 g / L. For example, when the initiator is IRGACURE® 184, it may be present in an amount of 11.5 g / L.

[0037] Finally, the precursor solution includes at least one chemical selected from alkali halides, alkali phosphates, alkali sulfates, and mixtures thereof.

[0038] The present authors have discovered that these agents contribute to the neutralization of organophosphorus compounds, especially Type V combat organophosphorus compounds, which contain a sulfur atom attached to a phosphonate group, and the agents are able to cleave the phosphorus-sulfur bond, accelerating hydrolysis.

[0039] Furthermore, said agents make it possible to increase the ionic strength of the solution in which they are contained, thereby increasing, among other things, the ability to sequester discrete organic compounds by osmotic pressure.

[0040] The agent may be present in the precursor solution in an amount of 1 to 30 g / L, preferably 1 to 15 g / L.

[0041] More specifically, the chemical may be selected from alkali fluorides, which may be present in the precursor solution in an amount of 1 to 15 g / L.

[0042] A particularly effective chemical that can be used in the precursor solution of the present invention is potassium fluoride, which may be present in the solution in an amount of, for example, 11.5 g / L.

[0043] For example, the precursor solution of the present invention may consist solely of at least one protic solvent, a monomer containing at least one (alkyl)acrylic, (alkyl)acrylate, or (alkyl)acrylamide group, at least one crosslinker containing at least two groups selected from (alkyl)acrylic, (alkyl)acrylate, or (alkyl)acrylamide groups, and at least one chemical selected from alkali halides, alkali phosphates, alkali sulfates, and mixtures thereof.

[0044] The precursor solution according to the present invention comprises: Water as a protic solvent, -N,N'-dimethylacrylamide as a monomer, - As a cross-linking agent, polyethylene glycol dimethyl acrylate or a mixture thereof, 1-hydroxy-cyclohexyl phenyl ketone (also known as IRGACURE® 184) as a photoinitiator; - Chemicals include potassium fluoride and The solution may contain and / or consist of only these.

[0045] One possibility is that the support consists of at least one foamed polymer layer, which gives the support good flexibility and makes it flexible and flat even in a multi-layer structure, making it easy to handle at the decontamination site.

[0046] According to one embodiment, the support has an upper surface layer including a portion impregnated with the capture layer. This impregnation is carried out over a thickness of the order of a few tenths of a millimeter. This impregnation is beneficial for ensuring fixation between the support and the capture layer. As will be described later in the description of the manufacturing method, this impregnation is achieved by depositing a viscous precursor solution of the capture layer into the pores of the support by simple capillary action and gravity before the polymerization process.

[0047] One possibility is that the support consists of a single polymer.

[0048] The upper surface layer comprises the portion of the thick support below the upper surface, and has a thickness of 1 mm or less.

[0049] According to one configuration, the support consists of at least one polyurethane (PU) foam layer. The use of such a material has the advantage that it is cheap and can be obtained by known methods.

[0050] According to one configuration, the support 1 is made of a polyester-based nonwoven material.

[0051] According to one possibility, based on the workability required for rolling up the decontamination covering and the desired mechanical strength, the support has a thickness of between 1 and 10 mm, in particular a thickness of between 2 and 7 mm.

[0052] In certain embodiments, the support is a multi-layer assembly including an upper layer and an adsorbent lower layer, the adsorbent lower layer being capable of adsorbing toxic chemicals. Therefore, increasing the thickness of such a multi-layer support can improve the containment of the decontamination coating. Furthermore, the lower layer complements the isolation effect provided by the toxic compound capture layer by adsorbing any remaining toxic compounds, particularly those present in a gaseous state. Therefore, the lower layer can confine the toxic compounds.

[0053] According to one possibility, the multi-layer assembly comprises polyurethane foam.

[0054] According to one configuration, the surface layer of the upper layer of the multi-layer assembly is impregnated with a portion of the capture layer.

[0055] According to one possibility, the adsorbent sublayer comprises and / or consists of a polyurethane foam layer impregnated with a porous adsorbent material.

[0056] According to one configuration, the adsorbent material comprises and / or consists of activated carbon.

[0057] According to one possibility, the decontamination coating comprises a bonding film between the lower and upper absorbent layers, which ensures that both layers of the support are bonded to one another.

[0058] According to one configuration, the bonding film is made of at least one polyolefin-based polymer material that is hot-melted at temperatures above 130° C. This property of the bonding film allows the lower and upper layers to be bonded simply and effectively by applying heat to promote adhesion.

[0059] According to other characteristics, the decontamination coating of the present invention is · A holding film fixed to the underside of the support via an adhesive film. The adhesive film comprises or consists of a material derived from an acrylic polymer. The adhesive film thickness is less than 1 mm. The capture layer has a thickness of 1 to 4 mm, in particular a thickness of 1.5 to 3 mm. The support is single layer. The support made of polyurethane foam generally has open pores. · PU foams are obtained from a mixture of polyols and isocyanates. The thickness of the impregnation on the upper surface layer of the support is several tens of nanometers. In a two-layer assembly, the PU foam in the lower layer is the same as the PU foam in the upper layer. PU foam density is 15~40 kg / cm 3 This gives the covering the necessary maneuverability for use and packaging in a rolled up state. The support is a two-layer assembly consisting of an upper layer, an absorbent lower layer and an adhesive film. The thickness of the adsorbent sublayer is 0.5-3 mm. The top layer has a thickness of between 1 and 4 mm, for example 1 to 3 mm. The weight per unit area of ​​activated carbon in the adsorptive lower layer is 50-500 mg / m 3 is. The hot melt material of the adhesive film is selected from polyester materials, polyamide materials and / or combinations of these materials. The invention includes one or more of the following properties, either alone or in combination:

[0060] According to a second aspect, the present invention provides a decontamination apparatus comprising a decontamination jacket as described above and a packaging for storing the decontamination jacket, the packaging being formed by a multi-layer assembly including at least one aluminum layer and a PET (PolyEthylene Terephthalate) layer.

[0061] This packaging allows the decontamination covering to be stored away from light to protect it from UV rays, airtight to prevent moisture from entering, and free from adhesion to prevent damage, thereby ensuring storage of the decontamination covering for several months.

[0062] One possibility is for the packaging to be heat-sealable, allowing it to be hermetically sealed after the decontamination jacket has been inserted.

[0063] According to a variant, the packaging comprises an airtight zipper.

[0064] According to one configuration, the packaging comprises three or four layers, these layers being made of aluminum or PET.

[0065] For example, packaging for a decontamination device according to the present invention includes a 12 micrometer outer polyester (PET), a 12 micrometer aluminum (center), and a 75 micrometer inner polyethylene.

[0066] Tests have been conducted with the three-layer packaging described and have shown that it can, in fact, store decontamination coatings for up to one year without deterioration and therefore loss of capture capacity.

[0067] According to a third aspect, the present invention provides a method for producing a decontamination coating as hereinbefore described, the method comprising: (a) providing a support film; (b) fixing the lower surface of the support to a retaining film; (c) depositing a capture layer precursor solution on the top surface of the support; (d) photopolymerizing the precursor solution to obtain a capture layer. Includes.

[0068] According to one possibility, the fixing of the underside of the support to the carrier film is achieved by means of an adhesive film which has previously been deposited on the carrier film.

[0069] The deposition of the precursor solution on the upper surface in step (c) is performed so that the precursor solution impregnates the top surface layer of the support and forms part of the capture layer impregnated into the support in step (d), thereby enhancing adhesion between the capture layer and the support.

[0070] According to one possibility, the deposition of the precursor solution is carried out by coating the support. Depending on the viscosity of the precursor solution, the solution penetrates the upper surface of the support, for example, up to a few tenths of a millimeter of the thickness of the support, ensuring a strong fixation of both layers. This makes it particularly easy to use and allows the coating to be rolled up during packaging.

[0071] According to one embodiment, the photopolymerization of the precursor solution may be carried out by radiation, in particular ultraviolet radiation, i.e. radiation with a wavelength in the ultraviolet range (i.e. wavelengths between 350 nm and 420 nm). The intensity of the radiation may be between 1,000 and 10,000 W / m 2 may be.

[0072] According to one possibility, the method comprises a step (i) carried out after step (b), in which a polyurethane foam is prepared comprising a two-layer assembly obtained by bonding an adsorbent lower layer and an upper layer together via an adhesive film.

[0073] According to one possibility, the method comprises a step (j) before step (i), in which the foamed polymer underlayer is immersed in an aqueous activated carbon solution containing a binder and a viscous agent, to form an absorbent underlayer after drying.

[0074] According to one possibility, step (j) is repeated twice on the lower layer impregnated with activated carbon after drying to increase the adsorption capacity according to the target need.

[0075] According to one configuration, the manufacturing method, particularly in the above-mentioned packaging device, includes a step (e) of rolling up the covering onto itself for packaging purposes, with the capture layer in contact with the holding film and the surfaces in direct contact.

[0076] Other aspects, objects and advantages of the present invention will be better shown on reading the following description of two embodiments, which are shown by way of non-limiting example with reference to the accompanying drawings, in which, to improve readability, not all elements are necessarily shown to scale. In the following description, for the sake of simplicity, identical, similar or corresponding elements in different embodiments are provided with the same numerical references. [Brief explanation of the drawings]

[0077] [Figure 1] FIG. 1 is a diagram showing a cross section of a decontamination covering according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a diagram showing a schematic diagram of the decontamination covering rolled up in preparation for packaging. [Figure 3] FIG. 3 is a schematic diagram showing a cross section of a decontamination covering according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0078] In the drawings and the following description, the same reference numerals indicate the same or similar elements. Furthermore, various elements are not drawn to scale to enhance clarity of the drawings. In addition, different embodiments and variants are not mutually exclusive and can be combined with each other.

[0079] Unless otherwise specified, in this document the term "substantially" means "exactly, or within 10% or 10°."

[0080] As shown in FIG. 1 , decontamination covering 100 includes support 1, capture layer 3 formed on upper surface 2 thereof, and retaining film 4 secured to lower surface 5 of support 1 via adhesive film 6. Support 1 includes a porous material layer obtained from a foamed polymer such as polyurethane foam. Support 1 may also be a polyester-based nonwoven material that can fulfill the same role as polyurethane foam in decontamination covering 100. Support 1 is sufficiently flexible so that it can be rolled up by itself even after being secured to capture layer 3 and retaining film 4 (see FIG. 2 ), thereby facilitating packaging, especially when manufactured in the form of a continuous strip.

[0081] The capture layer 3 is intended to come into contact with toxic pollutants and is formed by coating the upper surface 2 of the support 1. The capture layer 3 takes the form of a hydrogel obtained by photopolymerization of a precursor solution, which contains: a monomer containing at least one (alkyl)acrylic, (alkyl)acrylate or (alkyl)acrylamide group, at least one crosslinker comprising at least two groups selected from (alkyl)acrylic, (alkyl)acrylate or (alkyl)acrylamide groups, at least one photoinitiator, At least one chemical selected from alkali halides, alkali phosphates, alkali sulfates, and mixtures thereof, diluted with a protic solvent such as water a precursor solution comprising Includes.

[0082] The precursor solution is deposited by coating and, simply by gravity, penetrates within a few tenths of a millimeter into the upper surface layer of the porous support 1 during the time required for photopolymerization. This forms a portion 7 where the capture layer 3 is impregnated into the support 1, achieving good adhesion between the support 1 and the capture layer 3.

[0083] The support film 4 is adhered to the underside 5 of the support 1 prior to coating with the precursor solution, thereby achieving the necessary rigidity of the support 1 and preserving its shape (extending in a plane and including at least two parallel sides) and flatness during the step of forming the capture layer 3.

[0084] 3 shows a decontamination covering 100' according to a second embodiment of the present invention. It differs from the previous one in that the support 1 comprises a two-layer assembly 8 based on polyurethane foam, which comprises an upper layer 9 on which the capture layer 3 is formed, and an adsorbent lower layer 11 connected to the upper layer 9 by a hot-melt adhesive film 12. The adsorbent lower layer 11 is a polyurethane foam layer impregnated with activated carbon. This construction is designed to improve decontamination in the presence of contaminants that are more volatile or at least capable of migrating through the thickness of the decontamination covering 100, 100'.

[0085] The present invention will now be described with reference to the following examples, which are provided merely to illustrate the present invention and are not intended to limit the present invention in any way.

[0086] The French General Directorate of Armaments (DGA) carried out decontamination tests against organophosphorus combat gases using samples 200 and 200' of both types of decontamination coating 100 and 100' (with and without activated carbon), in accordance with the recommendations of the AEP-65 standard (NATO standard) and specifically adapted to the properties of samples 200 and 200'.

[0087] Samples 200 and 200' are 5 x 5 cm 2 and a thickness between 3 and 4 mm, and were removed from the packaging immediately prior to the decontamination test.

[0088] An example of preparing a precursor solution for the capture layer 3 according to one embodiment of the present invention is described below.

[0089] In a 30 mL tablet container (previously dried overnight in an oven under vacuum at 90°C and packed under argon), 10.4 mL of N,N'-dimethylacrylamide, 11.0 mL of distilled water, 0.35 mL of poly(ethylene glycol) dimethacrylate with an average molecular weight of 750 g / mol, 0.25 g of IRGACURE® 184, and 0.25 g of potassium fluoride are sequentially introduced.

[0090] A magnetic stir bar is introduced into the resulting medium, which is then purged with argon and magnetically stirred until the solid compounds, such as IRGACURE® 184 and potassium fluoride, are completely dissolved.

[0091] The precursor solution is deposited by coating on the upper surface 2 of the support 1, 8. The wavelength is 405 nm and the power is 9000 W / m 2 The precursor solution is completely gelled by exposing it to UV light for 9 minutes, forming a hydrogel, and the decontamination coating 100, 100' can be obtained.

[0092] At the same time, the contaminating compound is placed on a flat-surfaced HDPE (high density polyethylene) substrate. After the substrate is contaminated, it is placed in an airtight container controlled at about 30°C for 90 minutes.

[0093] The decontamination coating 100, 100' is then pressed (20 g / cm 2 ) onto the surface of the contaminated substrate. 2 ) and place it in a container controlled at about 30°C for 1 hour while maintaining pressure on the laminate.

[0094] The decontamination coating 100, 100' is then placed in a solvent to dissolve the contaminant compounds captured by the decontamination coating 100, 100'. The resulting solvent solution is analyzed by gas / liquid chromatography for the contaminant, and the amount of contaminant captured by the decontamination coating 100, 100' is calculated.

[0095] These tests were performed five times for each of the three toxic organophosphorus compounds (compounds A, B, and C) using sample 200 of the decontamination coating 100 without activated carbon, sample 200' of the decontamination coating 100' with activated carbon, and a decontamination layer containing only the capture layer 3 material (hereafter referred to as the hydrogel coating).

[0096] The results of these tests, shown in Table 1 below, show the decontamination efficiency of sample 200 relative to the hydrogel coating alone (when the nature of the capture layer material is the same) and the decontamination efficiency of sample 200' relative to the hydrogel coating alone (for the application of hydrogel alone, see in particular document EP 3740514).

[0097] [Table 1]

[0098] Decontamination testing has shown that decontamination coatings 100 (Sample 200) and 100' (Sample 200') are more effective than the hydrogel coating alone (e.g., a 97% improvement in decontamination was observed between Sample 200 and the hydrogel coating for Compound A). Decontamination coating 100' containing activated carbon is particularly effective at decontaminating organophosphorus compound contaminants present on smooth substrates.

[0099] Additionally, samples 200, 200' of decontamination coatings 100, 100' were tested one year after being packaged in the above-described packaging and showed comparable decontamination. Therefore, it can be concluded that no degradation of trapping layer 3 occurs over this period in the packaged state.

[0100] Thus, the present invention provides a highly efficient decontamination coating for toxic compounds, particularly organophosphorus compounds, which is stable over time and is particularly easy to manufacture in strip form that can be cut according to the desired application.

Claims

1. A decontamination coating (100, 100') intended to trap toxic chemicals by covering a contaminated surface, comprising: The decontamination coating has a multi-layer structure, the multi-layer structure comprising: A support (1), a capture layer (3) provided on the upper surface (2) of the support (1), the capture layer (3) being intended to contact and capture the toxic chemical; a support film (4) fixed to a lower surface (5) of the support (1) opposite the upper surface (2), the support film maintaining the shape of the support (1) in and across the plane during formation of the capture layer (3); A decontamination covering comprising:

2. 2. The decontamination coating (100, 100') of claim 1, The capture layer (3) is Depositing a precursor solution of a precursor solution capture layer (3) on the top surface (2) of the support (1); polymerizing the precursor solution; a hydrogel layer formed by The precursor solution includes at least one protic solvent, at least one monomer having an (alkyl)acrylic, (alkyl)acrylate, or (alkyl)acrylamide group, at least one crosslinker having at least two groups selected from an (alkyl)acrylic, (alkyl)acrylate, or (alkyl)acrylamide group, at least one photoinitiator, and at least one chemical selected from an alkali halide, an alkali phosphate, an alkali sulfate, and mixtures thereof.

3. 3. A decontamination covering (100, 100') according to claim 1 or 2, The decontamination covering, wherein the support (1) consists of at least one foamed polymer layer.

4. A decontamination covering (100, 100') according to any one of claims 1 to 3, The support (1) has an upper surface layer including a portion (7) where a portion of the capture layer (3) is impregnated into the support (1).

5. A decontamination covering (100, 100') according to any one of claims 1 to 4, The decontamination covering, wherein the support (1) consists of at least one polyurethane foam layer.

6. A decontamination covering (100') according to any one of claims 1 to 5, The support (1) is a multi-layer assembly (8) comprising an upper layer (9) and an adsorbent lower layer (11), the adsorbent lower layer (11) being capable of adsorbing the toxic chemical.

7. 7. The decontamination covering (100′) of claim 6, The decontamination coating wherein the adsorbent underlayer (11) comprises at least one polyurethane foam impregnated with a porous adsorbent material.

8. 8. The decontamination covering (100′) of claim 7, A decontamination coating wherein the porous adsorbent material comprises activated carbon.

9. A decontamination covering (100') according to any one of claims 6 to 8, A decontamination coating comprising a bonding film (12) between said lower absorbent layer (11) and said upper layer (9).

10. A decontamination apparatus comprising a decontamination covering (100, 100') according to any one of claims 1 to 9 and a packaging device for storing the decontamination covering, A decontamination apparatus, wherein the packaging is formed by a multi-layer assembly including at least one aluminum layer and a PET (polyethylene terephthalate) layer.

11. A method for manufacturing a decontamination covering (100, 100') according to any one of claims 1 to 9, comprising: (a) providing a support film (4); (b) fixing the underside (5) of the support (1) to the holding film (4); (c) depositing a precursor solution of the capture layer (3) on the top surface (2) of the support (1); (d) photopolymerization of said precursor solution to obtain said capture layer (3); A method for manufacturing a decontamination covering, comprising:

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