Composite chemical defense laminate and chemical defense article

Abstract

The utility model relates to the technical field of medical chemical labor protection materials, in particular to a composite chemical defense laminate and a chemical defense article. The composite chemical defense laminate provided by the utility model comprises the first chemical defense layer, the color development layer and the second chemical defense layer, when a chemical substance breaks through the outermost first chemical defense layer, the color development layer is in contact with the chemical substance to generate color change reaction, and a wearer can directly observe whether the color development layer changes color or not from the outer side and quickly obtain chemical permeation information; the first chemical defense layer and the second chemical defense layer are both of a protection structure, double protection guarantee can be provided for a wearer, and safety time is provided when damaged chemical defense products are replaced. According to the chemical defense product manufactured by adopting the composite chemical defense lamination body, the damage and permeation conditions of the chemical defense product can be immediately known by observing the color change condition of the outer surface through naked eyes, operation equipment can be replaced in time, the operation safety is improved, and in addition, important evaluation reference is provided for whether the chemical defense product which is used for many times has the secondary use condition or not.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of medical chemical labor protection material, especially to a composite anti-chemical layer stack and anti-chemical articles. BACKGROUND

[0002] Anti-chemical articles are personal protective equipment and materials used to protect against harmful substances such as chemicals, biological agents, and radioactive substances, including anti-chemical clothing, anti-chemical gloves, protective boots, etc., mainly made of polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), nitrile rubber (NBR), and fluorinated rubber (FKM). However, anti-chemical gloves made of NBR and PVC, for example, can withstand a variety of chemicals listed in GB 24539-2021 "Protective Clothing - Chemical Protective Clothing," but in application scenarios such as new energy and chemical laboratories, they may come into contact with various chemical reagents beyond the standard, such as hydrofluoric acid, toluene amine, and ethyl acetate. In addition, the anti-chemical performance of protective articles can be affected by different concentrations of chemical substances, different temperatures, different pressures, contact duration, and different contact methods.

[0003] Chinese patent CN218262346U, published on January 10, 2023, discloses a layered product with chemical substance warning for protection and a protective product. The warning layered product has a three-layer structure from the outside to the inside: a colored chemical substance isolation layer, a chemical substance warning layer, and a colorless transparent layer. In use, the isolation layer comes into contact with the chemical substance, which gradually penetrates into the isolation layer and further into the warning layer over time, causing a color change in the warning layer.

[0004] However, the layered product has a feature where the outer layer is a colored chemical substance isolation layer, and the innermost layer is a colorless transparent layer. In this arrangement, the wearer needs to remove the protective article and observe from the inside whether the protective article has been penetrated by chemicals. Alternatively, the wearer needs to carefully observe from the outside whether there is a color difference on the outermost layer to determine whether the protective article has been penetrated by chemicals. This arrangement limits the wearer to only these two observation methods, which are not timely enough to obtain information about chemical penetration. Therefore, how to instantly obtain the evaluation results of whether the chemical substance has penetrated and damaged the anti-chemical article remains a challenge for the safety production and emergency rescue of enterprises. UTILITY MODEL CONTENTS

[0005] To solve the problem of how to instantly obtain the evaluation results of whether the chemical substance has penetrated and damaged the anti-chemical article, the utility model provides a composite anti-chemical layer stack, which includes a first anti-chemical layer, a color development layer, and a second anti-chemical layer. The color development layer is arranged between the first anti-chemical layer and the second anti-chemical layer.

[0006] Wherein, the thickness of the first chemical protective layer is greater than or equal to 0.25 mm, the thickness of the color-developing layer is greater than or equal to 0.01 mm and less than or equal to 0.1 mm, and the thickness of the second chemical protective layer is greater than or equal to 0.1 mm and less than or equal to 0.15 mm.

[0007] In use, the first chemical protective layer is the outer layer, and the second chemical protective layer is the inner layer; when a chemical substance penetrates the first chemical protective layer, the color-developing layer will undergo a color-changing reaction upon contact with the chemical substance.

[0008] In one embodiment, the first chemical protective layer is any one of polyethylene, polytetrafluoroethylene, polyvinylidene chloride, polyvinylidene fluoride, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, thermoplastic elastomer, and fluororubber;

[0009] It should be noted that the polyethylene, polytetrafluoroethylene, polyvinylidene chloride, polyvinylidene fluoride, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, thermoplastic elastomer and fluororubber mentioned are all existing materials.

[0010] In one embodiment, the color-developing layer is a chemical warning layer containing film-forming materials and pigments;

[0011] It should be noted that the chemical substance warning layer is the material disclosed in Chinese patent CN218262346U on January 10, 2023.

[0012] In one embodiment, the second chemical-resistant layer is a flash-processed nonwoven fabric.

[0013] It should be noted that the flash-steamed nonwoven fabric is an existing material.

[0014] This utility model also provides a chemical protective glove, comprising a composite chemical protective laminate structure as described in any of the preceding claims and a main structural layer; wherein the main structural layer comprises at least a disordered textile made of any one of polyvinyl alcohol, polypropylene, polyester fiber, nylon, high-density polyethylene and polyvinyl chloride or a textile made of natural fibers.

[0015] This utility model also provides a protective garment, comprising a composite chemical protective laminate structure as described in any of the preceding claims and a main structural layer; wherein the main structural layer comprises at least a disordered textile made of any one of polyvinyl alcohol, polypropylene, polyester fiber, nylon, high-density polyethylene and polyvinyl chloride or a textile made of natural fibers.

[0016] This utility model also provides a protective boot, comprising a composite chemical-resistant laminate structure as described in any of the preceding claims and a main structural layer; wherein the main structural layer comprises at least one of nitrile rubber, chloroprene rubber, fluorinated rubber, butyl rubber, natural rubber, and polyvinyl chloride.

[0017] This utility model also provides a chemical protective accessory, including a composite chemical protective laminate structure as described in any of the preceding claims and a main structural layer; wherein, the main structural layer comprises a disordered textile fabric made of any one of polyvinyl alcohol, polypropylene, polyester fiber, nylon, high-density polyethylene and polyvinyl chloride.

[0018] Furthermore, the chemical protective accessories include sleeves, foot covers, aprons, reversed clothing, and head covers.

[0019] The composite chemical protective layer provided by this utility model has a three-layer structure from the outside in: a first chemical protective layer, a color-developing layer, and a second chemical protective layer. When a chemical substance penetrates the first chemical protective layer, the color-developing layer reacts with the chemical substance and changes color. The worker wearing the protective gear can directly observe the color change and react immediately to replace the protective gear. Simultaneously, since both the first and second chemical protective layers provide protection, when a chemical substance penetrates the first chemical protective layer and reacts with the color-developing layer, it will not directly penetrate the protective gear and reach the worker's skin. This provides a time buffer for the worker to replace the protective gear, thus doubly ensuring the worker's safety.

[0020] This utility model also provides chemical protective equipment with the above-mentioned composite chemical protective layer structure, including chemical protective gloves, protective clothing, protective boots, and chemical protective accessories. By visually observing the discoloration of the surface of the chemical protective equipment, one can immediately understand the damage and penetration of the chemical protective equipment and determine whether the equipment needs to be replaced. This reduces the operational risks for workers and provides an intuitive reference for the applicability and reliability of chemical protective equipment. It also provides an observable reference for the degree of decontamination after use of chemical protective equipment, and is an important evaluation item for whether chemical protective equipment that has been used multiple times is suitable for reuse. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the composite chemical protective laminate structure provided in Embodiment 1 of this utility model;

[0023] Figure 2 This is a schematic diagram of the color change reaction of the composite chemical protective laminate provided in Embodiment 1 of this utility model.

[0024] Figure label:

[0025] Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] The composite chemical protective layer provided by this utility model is configured from the outside to the inside as a first chemical protective layer 10, a color-developing layer 20, and a second chemical protective layer 30. Both the first and second chemical protective layers are protective structures. The first chemical protective layer 10 is a transparent layered structure. When a chemical substance penetrates the outermost first chemical protective layer 10, the color-developing layer 20 reacts with the chemical substance and changes color. The wearer can directly observe whether the color-developing layer 20 has changed color from the outside. The second chemical protective layer 30, as the inner layer in contact with the wearer, has the ability to prevent chemical penetration, preventing chemicals that have already penetrated the color-developing layer 20 from penetrating back into the other side of the composite chemical protective layer (the side where the first chemical protective layer 10 connects to the color-developing layer 20).

[0029] Example 1

[0030] This embodiment provides a composite chemical-resistant laminate, such as Figure 1 As shown, it consists of three layers: a first chemical protective layer 10, a color-developing layer 20, and a second chemical protective layer 30. The color-developing layer 20 is disposed between the first chemical protective layer 10 and the second chemical protective layer 30. The first chemical protective layer 10 has a thickness of 0.25 mm, the color-developing layer 20 has a thickness of 0.01 mm, and the second chemical protective layer 30 has a thickness of 0.1 mm. Figure 2 As shown, when the chemical substance penetrates the first chemical protective layer 10, the color-developing layer 20 will undergo a significant color change reaction upon contact with the chemical substance.

[0031] In this embodiment, preferably, the first chemical protective layer 10 is polyethylene.

[0032] In this embodiment, preferably, the color development layer 20 is the chemical warning layer provided in Example 1 of Chinese Patent CN218262346U, and its formula is 20 g of polyurethane resin, 40 g of butyl acetate, 10 g of CLARIANT Hostaperm Red E5B purple powder, 3 g of fumed silica, 3 g of litmus and 2 g of isocyanate crosslinking agent.

[0033] In this embodiment, preferably, the second chemical protective layer 30 is S1045 series flash-processed nonwoven fabric from Xiamen Dangsheng New Materials Co., Ltd.

[0034] In this embodiment, the composite chemical protective laminate is specifically prepared by the following steps: a chemical warning layer mixed according to the formula is coated on the surface of a flash-evaporated nonwoven fabric to obtain a two-layer composite laminate; then polyethylene is attached to the side of the two-layer composite laminate with the color-developing layer by means of a coating process to obtain the composite chemical protective laminate.

[0035] Example 2

[0036] This embodiment provides a composite chemical protective laminate, which consists of three layers: a first chemical protective layer 10, a color-developing layer 20, and a second chemical protective layer 30. The color-developing layer 20 is disposed between the first chemical protective layer 10 and the second chemical protective layer 30. The first chemical protective layer 10 has a thickness of 0.5 mm, the color-developing layer 20 has a thickness of 0.1 mm, and the second chemical protective layer 30 has a thickness of 0.15 mm. When a chemical substance penetrates the first chemical protective layer 10, the color-developing layer 20 will undergo a significant color change reaction upon contact with the chemical substance.

[0037] In this embodiment, preferably, the first chemical protective layer 10 is fluororubber.

[0038] In this embodiment, preferably, the color development layer 20 is the chemical warning layer provided in Example 2 of Chinese Patent CN218262346U, and its formula is 100 g of fluororubber, 3 g of magnesium oxide, 8 g of calcium hydroxide, 2 g of bisphenol vulcanizing agent, 0.8 g of BPP, 8 g of color powder CLARIANT Hostaperm Red E5B, 2 g of phenolphthalein and 400 g of butyl acetate.

[0039] In this embodiment, preferably, the second chemical protective layer 30 is S1043 series flash-processed nonwoven fabric from Xiamen Dangsheng New Materials Co., Ltd.

[0040] In this embodiment, the composite chemical protective laminate is specifically prepared by the following steps: a chemical warning layer mixed according to the formula is coated on the surface of a flash-evaporated nonwoven fabric to obtain a two-layer composite laminate; then fluororubber is attached to the side of the two-layer composite laminate with the color developing layer by means of a coating process to obtain the composite chemical protective laminate.

[0041] Example 3

[0042] This embodiment provides a composite chemical protective laminate, which consists of three layers: a first chemical protective layer 10, a color-developing layer 20, and a second chemical protective layer 30. The color-developing layer 20 is disposed between the first chemical protective layer 10 and the second chemical protective layer 30. The first chemical protective layer 10 has a thickness of 0.25 mm, the color-developing layer 20 has a thickness of 0.1 mm, and the second chemical protective layer 30 has a thickness of 0.1 mm. When a chemical substance penetrates the first chemical protective layer 10, the color-developing layer 20 will undergo a significant color change reaction upon contact with the chemical substance.

[0043] In this embodiment, preferably, the first chemical protective layer 10 is polytetrafluoroethylene.

[0044] In this embodiment, preferably, the color development layer 20 is the chemical warning layer provided in Example 3 of Chinese Patent CN218262346U, and its formula is 100 g of PVC paste resin, 70 g of plasticizer DOP, 10 g of TXIB, 2 g of calcium-zinc stabilizer BAEROPAN MC9659, 2 g of epoxidized soybean oil and 10 g of viscosity reducer (Exxsol D 80).

[0045] In this embodiment, preferably, the second chemical protective layer 30 is S1045 series flash-processed nonwoven fabric from Xiamen Dangsheng New Materials Co., Ltd.

[0046] In this embodiment, the composite chemical protective laminate is specifically prepared by the following steps: a chemical warning layer mixed according to the formula is coated on the surface of a flash-evaporated nonwoven fabric to obtain a two-layer composite laminate; then polytetrafluoroethylene is attached to the side of the two-layer composite laminate with the color developing layer by means of a coating process to obtain the composite chemical protective laminate.

[0047] Although this document frequently uses terms such as composite, laminate, first chemical protective layer, color-developing layer, and second chemical protective layer, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A composite chemical protective laminate characterized by: The composite chemical protective layer stack structure comprises a first chemical protective layer, a color developing layer and a second chemical protective layer, wherein the color developing layer is arranged between the first chemical protective layer and the second chemical protective layer. The thickness of the first chemical protective layer is greater than or equal to 0.25 mm, the thickness of the color developing layer is greater than or equal to 0.01 mm and less than or equal to 0.1 mm, and the thickness of the second chemical protective layer is greater than or equal to 0.1 mm and less than or equal to 0.15 mm.

2. The composite chemical protective laminate of claim 1, wherein: The first chemical protective layer is any one of polyethylene, polytetrafluoroethylene, polyvinylidene chloride, polyvinylidene fluoride, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, thermoplastic elastomer and fluororubber.

3. The composite chemical protective laminate of claim 1, wherein: The color developing layer is a chemical warning layer containing a film-forming material and a pigment.

4. The composite chemical protective laminate of claim 1, wherein: The second chemical protective layer is a flash method non-woven fabric.

5. A chemical resistant glove characterized by: The composite chemical protective layer stack structure comprises a first chemical protective layer, a color developing layer and a second chemical protective layer, wherein the color developing layer is arranged between the first chemical protective layer and the second chemical protective layer. The main structure layer comprises at least one of nitrile rubber, chloroprene rubber, natural rubber, polyvinyl chloride and polyethylene.

6. A protective garment characterized by: The composite chemical protective layer stack structure comprises a first chemical protective layer, a color developing layer and a second chemical protective layer, wherein the color developing layer is arranged between the first chemical protective layer and the second chemical protective layer. The main structure layer comprises at least one of disordered textile made of polyvinyl alcohol, polypropylene, polyester fiber, nylon, high-density polyethylene and polyvinyl chloride or textile made of natural fiber.

7. A protective boot, characterized by: The composite chemical protective layer stack structure comprises a first chemical protective layer, a color developing layer and a second chemical protective layer, wherein the color developing layer is arranged between the first chemical protective layer and the second chemical protective layer. The main structure layer comprises at least one of nitrile rubber, chloroprene rubber, fluorinated rubber, butyl rubber, natural rubber and polyvinyl chloride.

8. A chemical resistant accessory characterized by: The composite chemical protective layer stack structure comprises a first chemical protective layer, a color developing layer and a second chemical protective layer, wherein the color developing layer is arranged between the first chemical protective layer and the second chemical protective layer. The main structure layer comprises disordered textile made of polyvinyl alcohol, polypropylene, polyester fiber, nylon, high-density polyethylene and polyvinyl chloride.

9. The chemical resistant accessory of claim 8, wherein: The chemical protective accessories include sleeves, foot coverings, aprons, reverse wear and head coverings.

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