Magnetic responsive self-stripping peelable film, and preparation method and application thereof

Abstract

This application discloses a magnetically responsive self-peelable membrane, its preparation method, and its application, belonging to the technical field of gamma pollution removal materials. The magnetically responsive self-peelable membrane comprises an ionic liquid, a film-forming matrix, a dispersion medium, a surfactant, a thickener, and a colorant. The ionic liquid is a magnetic imidazole onyx salt containing terbium, dysprosium, or gadolinium, imparting magnetic responsiveness to the membrane. The preparation method includes sequentially dissolving raw materials to prepare a mixture, coating the mixture onto the contaminated area by spraying or brushing to form a film, and achieving self-peeling using an electromagnet / permanent magnet. This application solves the problems of difficult mechanical peeling and high radiation risk of manual peeling in existing technologies, achieving non-contact, integrated peeling, with a removal rate of 78%~93% for gamma pollution on stainless steel surfaces, effectively avoiding secondary pollution.

Description

Technical Field

[0001] This application relates to the field of gamma pollution removal materials technology, and more specifically, to a magnetically responsive self-peelable membrane, its preparation method, and its application. Background Technology

[0002] During the decommissioning process of reprocessing plants, peelable membrane decontamination is an important method for removing gamma-ray contaminants from process equipment and plant surfaces. This method involves coating the contaminated surface with a millimeter-thick peelable membrane, utilizing its adhesive properties to immobilize radionuclides, and then removing the contaminants completely through a peeling operation. Currently, peelable membrane decontamination mainly relies on two methods: manual peeling or robotic arm-assisted peeling. While manual peeling can achieve complete removal, it poses a risk of radiation exposure to personnel. Although robotic arm peeling can reduce human intervention, the thickness of the peelable membrane exceeds the precision and flexibility range of conventional robotic arms, making it difficult to achieve effective initiation and complete removal, and easily leading to secondary or cross-contamination.

[0003] Therefore, there is an urgent need to develop a peelable membrane that can be self-peeled under magnetic control in order to solve the above-mentioned technical bottlenecks. Summary of the Invention

[0004] The purpose of this application is to provide a magnetically responsive self-peelable membrane, its preparation method and application, which can realize the automatic peeling of the peelable membrane under magnetic control, and can effectively remove surface gamma contaminants in nuclear facilities.

[0005] To achieve the above objectives, this application provides a magnetically responsive self-peelable membrane, comprising an ionic liquid, a film-forming matrix, a dispersion medium, a surfactant, a thickener, and a colorant.

[0006] Furthermore, it includes the following components by mass fraction: 15%~25% ionic liquid, 10%~25% film-forming matrix, 40%~70% dispersion medium, 2%~3% surfactant, 1%~5% thickener and 0.1%~2% colorant.

[0007] Furthermore, the ionic liquid includes at least one of bis(1-methyl-3-octylimidazolium)pentanitrate terbium(III) salt, bis(1,2,3-trimethylimidazolium)pentanitrate dysprosium(III) salt, and bis(1-butyl-3-methylimidazolium)pentanitrate gadolinium(III) salt.

[0008] Furthermore, the film-forming matrix includes at least one of polyvinyl alcohol, polyvinylpyrrolidone, hydroxyethyl cellulose, and polyethylene oxide.

[0009] Furthermore, the dispersion medium includes at least one of water, anhydrous ethanol, and n-butanol.

[0010] Furthermore, the surfactant includes at least one of sodium dodecyl sulfate, polyethylene glycol octylphenyl ether, and hexadecyltrimethylammonium bromide.

[0011] Furthermore, the thickener includes at least one of xanthan gum, shellac, and sodium polyacrylate.

[0012] Furthermore, the colorant is Rhodamine B or iron oxide red.

[0013] This application also provides a method for preparing a magnetically responsive self-peelable membrane, comprising the following steps: sequentially dissolving a film-forming matrix, an ionic liquid, and a surfactant in a dispersion medium at 30°C to 40°C, cooling to room temperature, adding a thickener and a color developer to obtain a magnetically responsive self-peelable membrane mixture; coating the magnetically responsive self-peelable membrane mixture onto the area to be peeled, and allowing it to stand for 40 min to 120 min to obtain the membrane.

[0014] This application also provides an application of a magnetically responsive self-peelable membrane, wherein the magnetically responsive self-peelable membrane is prepared on the surface of the area to be peeled, and the magnetically responsive self-peelable membrane is adsorbed by an electromagnet or a permanent magnet to remove γ-nucleoside contamination from the surface of the area to be peeled.

[0015] In summary, this application has the following advantages: The magnetically responsive self-peelable membrane of this application utilizes a magnetically driven self-peeling mechanism to precisely control the overall peeling of the membrane, significantly improving the success rate and efficiency of mechanical peeling. Overall membrane peeling effectively prevents the shedding and diffusion of adsorbed radioactive materials, eliminating secondary and cross-contamination at the source, ensuring the cleanliness and stability of the decontamination process, and reducing subsequent waste treatment costs and environmental risks.

[0016] The magnetically responsive self-peelable membrane of this application can achieve a decontamination rate of 78% to 93% for typical stainless steel surface gamma nuclide contamination in post-treatment plant decommissioning scenarios, with a maximum decontamination efficiency of 93%. It can effectively reduce the gamma dose level on the surface of stainless steel equipment, meeting the core prerequisite for decontamination compliance before decommissioning and dismantling in post-treatment plants. Furthermore, the magnetically responsive self-peelable membrane exhibits stable decontamination performance and is adaptable to various decommissioning targets such as process equipment and walls in the high-radioactive contamination environment of post-treatment plants, providing key technical support for the safe conduct of subsequent decommissioning and dismantling operations. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic flowchart of the preparation method of the magnetically responsive self-peelable membrane proposed in the embodiments of this application. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] In the nuclear fuel cycle, reprocessing is a crucial link in achieving efficient utilization of nuclear fuel resources and safe management of radioactive waste. Currently, the industry widely uses the PUREX process to process spent fuel. This process can effectively extract transuranic nuclides such as plutonium and americium from spent fuel, and purify and recover uranium-235 and uranium-238, laying the foundation for nuclear fuel recycling. However, during long-term operation, the process equipment in reprocessing plants will continuously come into contact with these transuranic nuclides and spent fuel fission products, inevitably leading to radioactive contamination on the equipment surfaces. Among these, some nuclides have the characteristic of emitting gamma rays (i.e., gamma nuclides). When these nuclides adhere to the surface of the process equipment, the gamma dose on the equipment surface will exceed the safety standard, resulting in gamma contamination. In the subsequent decommissioning phase of the reprocessing plant, thorough decontamination of process equipment, plant walls, and floors is a core prerequisite for ensuring the safe conduct of decommissioning and dismantling operations. Only by completing effective decontamination can the spread of radioactive materials during the decommissioning and dismantling process be avoided, and the radiation risk to workers and the surrounding environment be reduced.

[0021] In the field of radioactive decontamination technology for nuclear facilities, peelable membrane decontamination methods have shown significant application prospects due to their advantages such as relatively simple operation, high decontamination efficiency, and reduction of secondary waste generation. They particularly possess the potential to achieve fully mechanized decontamination operations, which is of great significance for reducing personnel contact with radioactively contaminated areas and lowering the risk of radiation exposure. However, the development of this type of decontamination method and its supporting equipment is currently constrained by a key technological bottleneck: the thickness of peelable membranes is typically in the millimeter range, a scale far exceeding the precision control range and flexible operation capabilities of conventional robotic arms and other remote operating equipment. This makes it difficult for conventional remote equipment to effectively peel off peelable membranes in practical applications, let alone guarantee the complete peeling of the membrane. If the peelable membrane cannot be effectively peeled off or is not completely peeled off, the radioactive material adsorbed by the membrane is easily detached and diffused, leading to secondary and cross-contamination, seriously affecting the decontamination effect and the safety of subsequent operations.

[0022] On the other hand, while manual stripping can achieve complete removal of the peelable membrane and the desired decontamination effect in most cases, this method requires personnel to be in close contact with the radioactive contaminated area, inevitably leading to direct exposure to radiation and resulting in radiation exposure. For nuclear facilities with extremely high radioactivity levels, such as reprocessing plants, close contact with radioactive contaminated areas not only fails to meet the principles of optimal radiation protection but also violates explicit prohibitions in relevant laws and regulations, making it practically infeasible.

[0023] Based on this, this application provides a magnetically responsive self-peelable membrane, its preparation method, and its application. This membrane enables non-mechanical peeling of the membrane based on magnetic force control in radioactive decontamination scenarios. This solves the dual problems of insufficient precision in conventional robotic arm operation and the legal and safety risks associated with manual peeling, and can be further applied to decontamination scenarios in high-radioactivity reprocessing plants.

[0024] Firstly, this application provides a magnetically responsive self-peelable membrane, comprising an ionic liquid, a film-forming matrix, a dispersion medium, a surfactant, a thickener, and a colorant. This magnetically responsive self-peelable membrane is developed around the function of decontamination in post-processing plants. It solves the problem of difficult remote peeling through magnetic response characteristics, meets the requirements for gamma nuclide contamination control with a high decontamination rate (78%~93%), and avoids radiation exposure and secondary contamination for personnel. Its functions cover all aspects of the treatment process, including peeling, decontamination, and safety, making it suitable for the special scenarios of high-radioactivity and high-precision operation in post-processing plants.

[0025] As some optional embodiments of this application, the magnetically responsive self-peelable membrane comprises the following components by mass fraction: 15%–25% ionic liquid, 10%–25% film-forming matrix, 40%–70% dispersion medium, 2%–3% surfactant, 1%–5% thickener, and 0.1%–2% colorant. In this application, the 15%–25% ionic liquid ensures the core magnetic response function, the 10%–25% film-forming matrix ensures membrane strength and peel integrity, the 40%–70% dispersion medium optimizes film flowability, the 2%–3% surfactant improves component compatibility, the 1%–5% thickener adjusts viscosity for spraying / brushing, and the 0.1%–2% colorant enables visual monitoring. The overall formulation highlights both the core functions of magnetic response and decontamination, while also considering operational feasibility and operational stability (membrane is not easily damaged), thus achieving a synergistic balance of multiple performance characteristics.

[0026] As some optional embodiments of this application, the ionic liquid includes at least one of di(1-methyl-3-octylimidazolium)pentanitrate terbium(III) salt, di(1,2,3-trimethylimidazolium)pentanitrate dysprosium(III) salt, and di(1-butyl-3-methylimidazolium)pentanitrate gadolinium(III) salt. The ionic liquid in this application is the core carrier for the magnetic response function. Imidazole-based ionic liquids containing rare earth metal ions (terbium, dysprosium, gadolinium), such as di(1-methyl-3-octylimidazolium)pentanitrate terbium(III) salt, are selected because, on the one hand, rare earth metal ions have excellent magnetic response characteristics and can generate directional forces under the action of electromagnets / permanent magnets, providing power for membrane self-peeling and being key to achieving magnetically controlled remote peeling; on the other hand, the molecular structure of imidazolium-based ionic liquids has good chemical stability and radionuclide adsorption capacity, which can help improve the capture efficiency of γ-nuclides, thereby enhancing the decontamination effect.

[0027] As some optional embodiments of this application, the film-forming matrix includes at least one of polyvinyl alcohol, polyvinylpyrrolidone, hydroxyethyl cellulose, and polyethylene oxide. The film-forming matrix in this application can ensure the integrity of the film after peeling and the stability of decontamination. Water-soluble or alcohol-soluble polymer materials such as polyvinyl alcohol and polyvinylpyrrolidone are selected, and their intermolecular forces are moderate, enabling the formation of a continuous and tough film, preventing leakage of radioactive materials due to film breakage after formation, and achieving overall peeling under magnetic force. Simultaneously, these materials have good adhesion to metal surfaces (such as stainless steel), allowing them to tightly adhere to the contaminated surface, ensuring sufficient adsorption of gamma nuclides and preventing decontamination failure due to film detachment.

[0028] As some optional embodiments of this application, the dispersion medium includes at least one of water, anhydrous ethanol, and n-butanol. The dispersion medium in this application can optimize film-forming performance and application compatibility. Water, as the main dispersion medium, is low-cost and environmentally friendly; anhydrous ethanol can improve the solubility of ionic liquids and film-forming matrices, promoting uniform mixing of components; n-butanol can regulate the evaporation rate of the mixture, keeping the film-forming time within a reasonable range of 40-120 minutes. This avoids both excessively rapid film formation leading to film cracking and excessively slow film formation affecting work efficiency. It also adapts to spray / brush application methods, further ensuring uniform film thickness.

[0029] As some optional embodiments of this application, the surfactant includes at least one of sodium dodecyl sulfate, polyethylene glycol octylphenyl ether, and hexadecyltrimethylammonium bromide. The surfactant of this application can solve the problem of compatibility between components. The multiple selection of sodium dodecyl sulfate (anionic), polyethylene glycol octylphenyl ether (nonionic), and hexadecyltrimethylammonium bromide (cationic) allows for flexible combination based on the charge characteristics of the ionic liquid and the film-forming matrix, reducing interfacial tension between components, avoiding phenomena such as stratification and precipitation, ensuring a uniform and stable mixture, and thus guaranteeing the uniformity of membrane components and the consistency of magnetic response and detergency performance.

[0030] As some optional embodiments of this application, the thickener includes at least one of xanthan gum, shellac, and sodium polyacrylate. The thickener of this application can adjust the viscosity of the film mixture to suit its application process and film formation. Xanthan gum, shellac, and sodium polyacrylate have good thickening and suspending abilities; an addition of 1% to 5% can adjust the viscosity of the mixture to a suitable range: too low a viscosity can easily lead to splashing during spraying and an excessively thin film (affecting the detergency); too high a viscosity makes it difficult to apply evenly and easily causes bubbles after film formation. Reasonable viscosity control ensures that the mixture uniformly covers the contaminated surface, forming a film of consistent thickness, further improving detergency stability.

[0031] As some optional embodiments of this application, the colorant is Rhodamine B or iron oxide red. Both Rhodamine B (red fluorescence) and iron oxide red (red) have high distinguishability; an addition of 0.1% to 2% can make the membrane exhibit a distinct color. Operators can intuitively judge the film formation range and integrity (such as whether there is any missed coating or damage) through remote monitoring equipment without close contact with the contaminated area, thus improving monitoring efficiency and further avoiding personnel radiation risks. It also facilitates subsequent confirmation after peeling to ensure that the contaminated area has been completely covered.

[0032] Secondly, based on a general inventive concept, this application also provides a method for preparing a magnetically responsive self-peelable membrane, such as... Figure 1 As shown, it includes the following steps: S1. The film-forming matrix, ionic liquid and surfactant are dissolved in a dispersion medium at 30℃~40℃ in sequence. After cooling to room temperature, a thickener and a color developer are added to prepare a magnetically responsive self-peelable membrane mixture. S2. The magnetically responsive self-peelable membrane mixture is coated onto the area to be peeled and allowed to stand for 40 to 120 minutes to obtain the final product. Preferably, the coating method is spraying or brushing.

[0033] The preparation method described in this application is simple and controllable, requiring no complex reaction conditions; only the temperature of the dispersion medium needs to be controlled at 30℃~40℃. It is easy for operators to master, requires no specialized high-end equipment, and can quickly achieve large-scale production. Simultaneously, the film-forming time (40min~120min) and coating method (spraying / brushing) are flexibly adjustable, adapting to the construction needs of different contaminated areas in post-treatment plants (such as curved surfaces of equipment and flat walls), making it highly practical. Furthermore, this application, through stepwise dissolution and precise temperature control, avoids uneven mixing problems caused by differences in the dissolution rate or temperature sensitivity of the raw materials (e.g., agglomeration easily occurs when ionic liquids and film-forming matrices are directly mixed at room temperature), ensuring that the final mixture has a uniform composition. Moreover, the uniform mixture, after coating, forms a film of consistent thickness and stable structure, avoiding fluctuations in decontamination efficiency caused by local performance defects in the film (such as uneven magnetic response and differences in adsorption capacity), thus stabilizing the γ-contamination removal rate on stainless steel surfaces at 78%~93%.

[0034] In the preparation method of this application, stepwise dissolution can provide an independent dissolution environment (temperature, time) for each raw material based on its dissolution kinetics (such as dissolution activation energy), avoiding dissolution obstruction caused by competitive dissolution or intermolecular repulsion when multiple raw materials are added simultaneously. For example, after dissolving the film-forming matrix and forming a polymer solution, an ionic liquid is added. The ionic liquid molecules can be more uniformly dispersed in the gaps between polymer chains, forming a stable mixed system. Moreover, there are differences in the requirements of the components and the solvent. For example, polyvinyl alcohol needs to be slowly dissolved in warm water or alcohol water at 30℃~40℃ to form a homogeneous solution. If it is directly mixed with an ionic liquid at room temperature, it is easy to cause agglomeration due to insufficient dissolution. Although the ionic liquid (such as di(1-methyl-3-octylimidazolium)pentanitrate terbium(III) salt) has high solubility in alcohol media, it needs to be added after the film-forming matrix has been initially dissolved to avoid interaction with undissolved film-forming matrix particles, which would affect the dissolution efficiency.

[0035] Thirdly, based on a general inventive concept, this application also provides an application of a magnetically responsive self-peelable membrane, comprising: preparing the magnetically responsive self-peelable membrane on the surface of the area to be peeled, and using an electromagnet or a permanent magnet to adsorb the magnetically responsive self-peelable membrane to remove γ-nucleoside contamination from the surface of the area to be peeled.

[0036] The magnetically responsive self-peelable membrane of this application achieves physical isolation between the peeling process and personnel through remote adsorption drive by electromagnets or permanent magnets. Operators can complete the peeling process from within a radiation-safe area by controlling the position and intensity of the magnets, without entering the contaminated area. This non-contact operation mode not only avoids direct exposure to personnel but also minimizes radiation dose, fully complying with the principle of optimal radiation protection. Furthermore, the rare earth metal ions (terbium, dysprosium, gadolinium) contained in the membrane endow it with excellent magnetic response characteristics, and the adsorption effect of the electromagnets / permanent magnets precisely matches this core function. The magnetic force can efficiently drive the membrane response, ensuring that the peeling action and the membrane's adsorption capacity are synchronized, preventing the membrane from detaching due to insufficient power during the peeling process. This ensures that the adsorption efficiency for gamma nuclides remains stable at a high level of 78%~93%, solving the problem of easy adsorption but difficult peeling, thus realizing a closed-loop decontamination process encompassing adsorption, peeling, and curing.

[0037] The principles and features of this application are described below with reference to embodiments. The examples are for illustrative purposes only and are not intended to limit the scope of this application. Unless otherwise specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0038] Example 1 This embodiment provides a magnetically responsive self-peelable membrane, which comprises the following components by mass fraction: Di(1-methyl-3-octylimidazolium)pentanitrate terbium(III) salt, 15%; Polyvinyl alcohol, 10%; Polyethylene oxide, 15%; Sodium dodecyl sulfate, 3%; Water, 20%; Anhydrous ethanol, 30%; Sodium polyacrylate, 3%; Xanthan gum, 2%; Rhodamine B, 2%.

[0039] The magnetically responsive self-peelable membrane of this embodiment is prepared by the following method: S101. Di(1-methyl-3-octylimidazolium)pentanitrate terbium(III) salt, polyvinyl alcohol, polyethylene oxide and sodium dodecyl sulfate are dissolved one by one in a mixed solution of water and anhydrous ethanol (30°C) to obtain a mixed solution.

[0040] S102. After cooling to room temperature, add sodium polyacrylate, xanthan gum and rhodamine B to the mixture, stir and mix evenly to obtain a magnetically responsive peelable membrane mixture.

[0041] S103. Spray the magnetically responsive peelable film mixture onto the stainless steel surface and let it stand for 60 minutes to form a magnetically responsive self-peelable film.

[0042] By using an electromagnet to approach a magnetically responsive self-peelable membrane, the membrane can be peeled off from the stainless steel surface, achieving a gamma contamination removal rate of 81%.

[0043] Example 2 This embodiment provides a magnetically responsive self-peelable membrane, which comprises the following components by mass fraction: Di(1-methyl-3-octylimidazolium)pentanitrate terbium(III) salt, 5%; Di(1,2,3-trimethylimidazolium)pentanitrate dysprosium(III) salt, 12%; Polyvinylpyrrolidone, 10%; Sodium dodecyl sulfate, 1%; Hexadecyltrimethylammonium bromide, 1%; Anhydrous ethanol, 49.9%; n-Butanol, 20%; Shellac, 1%; Iron oxide red, 0.1%.

[0044] The magnetically responsive self-peelable membrane of this embodiment is prepared by the following method: S201. Di(1-methyl-3-octylimidazolium)pentanitrate terbium(III) salt, di(1,2,3-trimethylimidazolium)pentanitrate dysprosium(III) salt, polyvinylpyrrolidone, sodium dodecyl sulfate and hexadecyltrimethylammonium bromide are dissolved one by one in a mixed solution of anhydrous ethanol and n-butanol (40°C) to obtain a mixed solution.

[0045] S202. After cooling to room temperature, shellac and iron oxide red are added to the mixture and stirred until homogeneous to obtain a magnetically responsive peelable membrane mixture.

[0046] S203. Spray the magnetically responsive peelable film mixture onto the stainless steel surface and let it stand for 40 minutes to form a magnetically responsive self-peelable film.

[0047] By using an electromagnet to approach a magnetically responsive self-peelable membrane, the membrane can be peeled off from the stainless steel surface, achieving a γ-contamination removal rate of 78%.

[0048] Example 3 This embodiment provides a magnetically responsive self-peelable membrane, which comprises the following components by mass fraction: 3% bis(1,2,3-trimethylimidazolium)pentanitrate dysprosium(III) salt; Di(1-butyl-3-methylimidazolium)pentanitrate gadolin(III) salt, 12%; Hydroxyethyl cellulose, 10%; Polyvinylpyrrolidone, 10%; Polyethylene glycol octylphenyl ether, 3%; Water, 45%; n-Butanol, 12%; Shellac, 3%; Sodium polyacrylate, 2%; Iron oxide red, 3%.

[0049] The magnetically responsive self-peelable membrane of this embodiment is prepared by the following method: S301. Di(1,2,3-trimethylimidazolium)pentanitrate dysprosium(III) salt, di(1-butyl-3-methylimidazolium)pentanitrate gadolinium(III) salt, hydroxyethyl cellulose, polyvinylpyrrolidone and polyethylene glycol octylphenyl ether are dissolved one by one in a mixed solution of water and anhydrous ethanol (40°C) to obtain a mixed solution.

[0050] S302. After cooling to room temperature, shellac, sodium polyacrylate and iron oxide red are added to the mixture and stirred until homogeneous to obtain a magnetically responsive peelable membrane mixture.

[0051] S303. Spray the magnetically responsive peelable film mixture onto the stainless steel surface and let it stand for 80 minutes to form a magnetically responsive self-peelable film.

[0052] By using an electromagnet to approach a magnetically responsive self-peelable membrane, the membrane can be peeled off from the stainless steel surface, achieving a gamma contamination removal rate of 88%.

[0053] Example 4 This embodiment provides a magnetically responsive self-peelable membrane, which comprises the following components by mass fraction: Di(1-methyl-3-octylimidazolium)pentanitrate terbium(III) salt, 15%; Di(1-butyl-3-methylimidazolium)pentanitrate gadolin(III) salt, 10%; Polyvinyl alcohol, 10%; Polyvinylpyrrolidone, 15%; Sodium dodecyl sulfate, 1%; Polyethylene glycol octylphenyl ether, 2%; Water, 40%; Shellac, 3%; Xanthan gum, 2%; Rhodamine B, 2%.

[0054] The magnetically responsive self-peelable membrane of this embodiment is prepared by the following method: S401. Di(1-methyl-3-octylimidazolium)pentanitrate terbium(III) salt, di(1-butyl-3-methylimidazolium)pentanitrate gadolinium(III) salt, polyvinyl alcohol, polyvinylpyrrolidone, sodium dodecyl sulfate and polyethylene glycol octylphenyl ether are dissolved in water (40°C) one by one to obtain a mixture.

[0055] S402. After cooling to room temperature, shellac, xanthan gum and rhodamine B are added to the mixture and stirred until homogeneous to obtain a magnetically responsive peelable membrane mixture.

[0056] S403. Spray the magnetically responsive peelable film mixture onto the stainless steel surface and let it stand for 120 minutes to form a magnetically responsive self-peelable film.

[0057] By using an electromagnet to approach a magnetically responsive self-peelable membrane, the membrane can be peeled off from the stainless steel surface, achieving a 93% removal rate of gamma contaminants.

[0058] In summary, this application innovatively proposes a remote, non-contact decontamination technology based on a magnetically peelable membrane to address the challenge of gamma nuclide decontamination in nuclear facility reprocessing. The core technology lies in introducing an ionic liquid containing rare-earth elements into the peelable membrane components, endowing the membrane with stable magnetism and laying the physical foundation for remote peeling. Simultaneously, nitrate ions in the ionic liquid can undergo a complexation reaction with gamma nuclides, significantly enhancing the membrane's chemical adsorption capacity for contaminants and improving decontamination efficiency. In practical applications, the magnetically responsive self-peelable membrane of this application is sprayed onto non-magnetically contaminated areas such as stainless steel or walls and floors. The membrane material first adsorbs and fixes the gamma nuclides on the surface. After the volatile components evaporate, a stable, continuous polymer film encapsulating the contaminants is formed. At this point, a permanent magnet or electromagnet carried by mechanical equipment is brought close to the magnetically responsive self-peelable membrane, and it can be automatically peeled off from the contaminated surface by magnetic force. The entire process requires no close-range personnel operation, thus minimizing the risk of personnel irradiation during gamma nuclide decontamination. Finally, by remotely controlling the magnetic force of the peeling device, not only can the film be peeled off smoothly, but the film can also be accurately collected and prepared after peeling.

[0059] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of this application.

[0060] Finally, it should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0061] This application uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A magnetically responsive self-peelable membrane, characterized in that, It includes ionic liquids, film-forming matrices, dispersion media, surfactants, thickeners, and colorants.

2. The magnetically responsive self-peelable membrane according to claim 1, characterized in that, It includes the following components by mass fraction: 15%~25% ionic liquid, 10%~25% film-forming matrix, 40%~70% dispersion medium, 2%~3% surfactant, 1%~5% thickener and 0.1%~2% colorant.

3. The magnetically responsive self-peelable membrane according to claim 1, characterized in that, The ionic liquid includes at least one of bis(1-methyl-3-octylimidazolium)pentanitrate terbium(III) salt, bis(1,2,3-trimethylimidazolium)pentanitrate dysprosium(III) salt, and bis(1-butyl-3-methylimidazolium)pentanitrate gadolinium(III) salt.

4. The magnetically responsive self-peelable membrane according to claim 1, characterized in that, The film-forming matrix includes at least one of polyvinyl alcohol, polyvinylpyrrolidone, hydroxyethyl cellulose, and polyethylene oxide.

5. The magnetically responsive self-peelable membrane according to claim 1, characterized in that, The dispersion medium includes at least one of water, anhydrous ethanol, and n-butanol.

6. The magnetically responsive self-peelable membrane according to claim 1, characterized in that, The surfactant includes at least one of sodium dodecyl sulfate, polyethylene glycol octylphenyl ether, and hexadecyltrimethylammonium bromide.

7. The magnetically responsive self-peelable membrane according to claim 1, characterized in that, The thickener includes at least one of xanthan gum, shellac, and sodium polyacrylate.

8. The magnetically responsive self-peelable membrane according to claim 1, characterized in that, The colorant is Rhodamine B or iron oxide red.

9. A method for preparing a magnetically responsive self-peelable membrane according to any one of claims 1-8, characterized in that, Includes the following steps: The film-forming matrix, ionic liquid and surfactant were dissolved in a dispersion medium at 30℃~40℃ in sequence. After cooling to room temperature, a thickener and a color developer were added to prepare a magnetically responsive self-peelable membrane mixture. The magnetically responsive self-peelable membrane mixture is coated onto the area to be peeled and allowed to stand for 40 to 120 minutes to obtain the final product.

10. An application of the magnetically responsive self-peelable peelable membrane according to any one of claims 1-8, characterized in that, The magnetically responsive self-peelable membrane is prepared on the surface of the area to be peeled, and the magnetically responsive self-peelable membrane is adsorbed by an electromagnet or a permanent magnet to remove γ nuclide contamination from the surface of the area to be peeled.

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