Long-acting multi-mechanism synergistic deodorization seamless wall cloth and preparation method and application thereof

Abstract

This invention provides a long-lasting, multi-mechanism synergistic deodorizing seamless wallcovering, its preparation method, and its application. The wallcovering comprises: a base layer; functional impregnated regions, formed by a composition including a first deodorizing active ingredient and an adhesive, which is impregnated and fixed to the fiber interior and surface of the base layer through an impregnation process; and a surface protection and synergistic layer, disposed on at least one side of the base layer with the functional impregnated regions, covering both the functional impregnated regions and the base layer surface not covered by the functional impregnated regions, the surface protection and synergistic layer containing a second deodorizing active ingredient; wherein the first and second deodorizing active ingredients synergistically remove odor molecules through different mechanisms of action. This invention solves the problems of weak interfacial bonding in existing multi-layer composite structures, easy mutual interference in simple mixing of multiple mechanisms, and lack of durability with single surface treatments, achieving efficient and long-lasting removal of multiple odor molecules.

Description

Technical Field

[0001] This invention relates to the field of building decoration materials technology, and in particular to a long-lasting, multi-mechanism synergistic deodorizing seamless wall covering, its preparation method, and its application. Background Technology

[0002] With the improvement of people's living standards and the enhancement of health awareness, indoor air quality has become an important indicator for measuring the quality of living and working environments. Indoor air pollutants come from a wide range of sources, mainly including volatile organic compounds such as formaldehyde and benzene released from building materials, as well as odors generated in daily life (such as musty smells, smoke, kitchen fumes, and pet odors). Long-term exposure to these pollutants can pose potential harm to human health; therefore, the development of efficient and long-lasting air purification materials is of significant practical importance.

[0003] Wallpaper, as an important material for interior decoration, has the advantages of large coverage area and sufficient contact with indoor air, making it an ideal carrier for air purification. Currently, some wallpaper products with air purification functions have appeared on the market, and their purification mechanisms are mainly divided into two categories: physical adsorption and chemical decomposition. Physical adsorption wallpapers typically adsorb odor molecules in the air by adding porous materials such as activated carbon and diatomaceous earth, but their adsorption capacity is limited, and they are prone to failure or even secondary release after reaching saturation. Chemical decomposition wallpapers decompose pollutants under light conditions by loading photocatalysts (such as nano-titanium dioxide), but they are highly dependent on ultraviolet light, have low efficiency under indoor visible light conditions, and a single decomposition mechanism is insufficient to deal with complex and diverse odor components.

[0004] Furthermore, existing functional wallpapers generally suffer from problems such as limited purification capabilities, short-lived effects, and difficulty in addressing multiple types of odors. For example, a single adsorption or decomposition mechanism is often insufficient to comprehensively cover odor molecules of different natures, such as ammonia (from pets and garbage), hydrogen sulfide (from sewers), and formaldehyde (from renovations). At the same time, the durability of wallpaper's functionality, as a long-term decorative material, is also a key factor limiting its practical application effectiveness.

[0005] Therefore, developing a seamless wall covering that can efficiently and persistently remove various odor molecules through the synergistic effect of multiple mechanisms has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] The purpose of this invention is to provide a long-lasting, multi-mechanism synergistic deodorizing seamless wall covering and its preparation method, which solves at least one of the problems mentioned in the background art.

[0007] A first aspect of the present invention provides a long-lasting, multi-mechanism synergistic deodorizing seamless wall covering, comprising: basal layer; The functional padding region is formed by a composition comprising a first deodorizing active ingredient and an adhesive, which is penetrated and fixed to the interior and surface of the fibers of the base layer through a padding process. A surface protection and enhancement layer is disposed on a surface of at least one side of a base layer in which the functional padding region has been formed, covering the functional padding region and the base layer surface not covered by the functional padding region, the surface protection and enhancement layer comprising a second deodorizing active ingredient. The first deodorizing active ingredient and the second deodorizing active ingredient work synergistically to remove odor molecules through different mechanisms of action.

[0008] A second aspect of the present invention provides a method for preparing the above-mentioned long-lasting multi-mechanism synergistic deodorizing seamless wall covering, comprising the following steps: S1. Perform surface pretreatment on the substrate to improve its surface energy and hydrophilicity; S2. A first deodorizing composition including a first deodorizing active ingredient is mixed with an adhesive, a wetting agent and water to prepare a padding working solution, and the pretreated substrate is subjected to padding treatment. S3. Dry the impregnated substrate to allow the adhesive to initially form a film, thus fixing the first deodorizing active ingredient onto the substrate; S4. Mix the second deodorizing composition, which includes the second deodorizing active ingredient, with water to prepare a spraying solution, and apply it to the surface of the semi-finished product obtained in step S3; S5. The coated semi-finished product is dried at low temperature to form a surface protection and enhancement layer, thereby obtaining the long-lasting multi-mechanism synergistic deodorizing seamless wall covering.

[0009] A third aspect of the present invention provides an application of the long-lasting, multi-mechanism synergistic deodorizing seamless wall covering as described above in improving indoor air quality. The wall covering is attached to an indoor wall and continuously removes odor molecules from the air through the synergistic effect of the functional impregnation layer and the surface protection and enhancement layer.

[0010] Compared with existing technologies and the direct use of a single deodorizing liquid, the wall covering and its preparation method of the present invention have the following significant advancements and inventiveness: 1. Breaking through the limitations of "simple coatings," this invention achieves a "deep gradient distribution" of functional systems: It pioneers a dual-layer process combining "internal padding and fixation" with "surface spraying enhancement." The first deodorizing active ingredient (e.g., plant extract) is deeply anchored within the substrate, providing long-lasting basic deodorization and antioxidant capabilities; the second deodorizing active ingredient (e.g., composite deodorizer) forms an active protective layer on the surface, preferentially contacting and rapidly neutralizing pollutants newly entering the air. This structure ensures both long-lasting effectiveness and rapid initial response, solving the problems of single surface treatments being undurable and prone to wear.

[0011] 2. A synergistic effect was discovered in the combination of plant extracts and organic-inorganic composite deodorizing components, creating a "1+1>2" full-spectrum deodorizing capability: Experiments showed that when plant extract A, which excels in physical encapsulation / antioxidation, is combined with organic-inorganic composite deodorizer B, which excels in chemical bonding / neutralization, in a specific ratio (e.g., 1:0.5 to 1:2), its comprehensive removal efficiency for mixed pollutants such as isovaleric acid, ammonia, acetic acid, 2-nonenal, hydrogen sulfide, and toluene is significantly higher than the simple sum of the efficiencies of using either ingredient alone. This synergistic effect is the core of this invention's broad-spectrum and highly efficient deodorization, achieving efficient and long-lasting removal of multiple odor molecules.

[0012] 3. Overcame the technical bottleneck of "long-term stability" of functional ingredients in wallpaper: By selecting environmentally friendly adhesives with suitable Tg and adopting a two-stage gradient temperature curing process, the functional ingredients are effectively encapsulated and fixed by the flexible polymer film, preventing rapid volatilization or migration loss, and avoiding the deactivation of natural active ingredients caused by high-temperature baking. The product has undergone accelerated aging tests (equivalent to 3 years under natural conditions), and the deodorization performance degradation rate is less than 15%.

[0013] 4. By introducing a phosphate buffer system and humectants (glycerin, sugar alcohols, etc.), the chemical stability and activity retention of the functional layer under complex environments are significantly improved, and the deactivation rate of functional ingredients is slowed down.

[0014] 5. Introducing 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) into the adhesive enhances the hydrophilicity and ion exchange capacity of the membrane, further improving the capture efficiency of polar odor molecules.

[0015] 6. Maintains the excellent physical properties and safety of the wallpaper: All functional layers use a water-based system, resulting in extremely low VOC emissions. The processed wallpaper has breathability, flexibility, and washability comparable to ordinary high-end wallpapers, with no odor or irritation, making it safe and environmentally friendly.

[0016] 7. Strong process adaptability, suitable for large-scale production: The preparation method of the present invention can be seamlessly connected with the existing wallcovering production line's impregnation, coating, and drying processes. Only one spraying or fine coating unit needs to be added, resulting in low modification costs and easy industrialization. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This invention relates to a method for preparing a long-lasting, multi-mechanism synergistic deodorizing seamless wall covering. Detailed Implementation

[0019] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0020] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form includes the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] It should be noted that if the text uses terms such as "first" or "second", these terms are only used to distinguish similar objects and should not be interpreted as indicating or implying their relative importance, order of precedence, or implicitly indicating the number of technical features indicated. It should be understood that the data in the descriptions of "first" and "second" can be interchanged where appropriate.

[0022] Throughout the accompanying drawings, identical elements are represented by the same or similar reference numerals. Conventional structures or configurations may be omitted where they might cause confusion in understanding the invention. Furthermore, the shapes, dimensions, and positional relationships of the components in the drawings do not reflect actual size, scale, or actual positional relationships. Additionally, any reference symbols placed within parentheses in this invention should not be construed as limiting the scope of the invention.

[0023] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] One aspect of the present invention provides a long-lasting, multi-mechanism synergistic deodorizing seamless wallcovering, comprising: a base layer; functional impregnated regions formed by a composition comprising a first deodorizing active ingredient and an adhesive, which is impregnated and fixed to the fiber interior and surface of the base layer through an impregnation process; and a surface protection and synergistic layer disposed on at least one side of the base layer where the functional impregnated regions are formed, covering the functional impregnated regions and the base layer surface not covered by the functional impregnated regions, the surface protection and synergistic layer comprising a second deodorizing active ingredient; wherein the first and second deodorizing active ingredients synergistically remove odor molecules through different mechanisms of action. For example, the first deodorizing active ingredient deodorizes through a physical encapsulation / antioxidant mechanism, while the second deodorizing active ingredient deodorizes through a chemical bonding / neutralization mechanism.

[0025] The functional padding region is a composite structure region formed through a padding process. It is formed by the penetration and fixation of a composition of a first deodorizing active ingredient and an adhesive into the interior and surface of the fibers of the base layer. This region and the base layer form an integrated composite structure, giving the base layer itself the primary deodorizing function.

[0026] A surface protection and enhancement layer is disposed on the surface of a base layer on one side where at least the functionally rolled area has been formed, covering both the functionally rolled area and the base layer surface not covered by the functionally rolled area. This layer contains a second deodorizing active ingredient, serving as a "first line of defense" against airborne pollutants.

[0027] This invention achieves efficient and long-lasting removal of indoor odor molecules by constructing a dual-layer deodorization structure with a "depth gradient distribution." The functional impregnation zone deeply anchors the primary deodorizing active ingredient within the fiber, providing a lasting basic deodorization capability; the surface protection and enhancement layer forms a fast-responding active barrier, preferentially contacting and neutralizing pollutants newly entering the air. The synergistic effect of both ensures long-lasting effectiveness while providing rapid initial response, solving the problems of single surface treatments being undurable and prone to wear.

[0028] The wallpaper of the present invention can deeply and persistently integrate highly efficient deodorizing components into the substrate through a specific process, so as to achieve broad-spectrum, synergistic and long-lasting removal of a variety of indoor gaseous pollutants, without affecting the decorative, breathable and physical properties of the wallpaper.

[0029] In some embodiments, the base layer can be a nonwoven fabric, woven fabric, or knitted fabric, preferably a nonwoven fabric. Nonwoven fabrics have excellent breathability and flexibility, making them suitable as a base for wall decoration materials. To further improve the bonding performance between the base layer and the functional material, it is preferable to perform surface treatment on the base layer. In some embodiments, the base layer is a nonwoven fabric treated with corona or low-temperature plasma. Corona treatment or low-temperature plasma treatment can introduce polar groups on the fiber surface, increasing its surface energy and hydrophilicity, thereby enhancing the bonding strength between the functional material and the fiber in subsequent padding processes.

[0030] In some embodiments, the first deodorizing active ingredient comprises natural plant extracts. The first deodorizing active ingredient comprises one or more of tea polyphenols, cyclodextrin derivatives, and flavonoids. The first deodorizing active ingredient primarily acts on neutral and hydrophobic odor molecules (such as formaldehyde, benzene compounds, and smoke odor) through physical inclusion (cyclodextrin), chemical complexation, and antioxidant decomposition (tea polyphenols, flavonoids) mechanisms.

[0031] Tea polyphenols (especially catechins) and flavonoids have strong antioxidant capabilities and can continuously decompose various organic pollutant molecules; the hydrophobic cavities of cyclodextrin derivatives (especially branched cyclodextrins) can effectively encapsulate neutral and hydrophobic odor molecules (such as benzene compounds and hydrophobic compounds in body odor), forming stable host-guest complexes and achieving a "lock-in" effect.

[0032] In some embodiments, the first deodorizing active ingredient comprises branched-chain cyclodextrin and tea extract. Branched-chain cyclodextrin has better water solubility and inclusion capacity than ordinary cyclodextrin, and tea extract is rich in tea polyphenols and flavonoids. The synergistic effect of the two can enhance the capture and decomposition of hydrophobic odor molecules.

[0033] In some embodiments, the second deodorizing active ingredient is an organic-inorganic composite deodorizer. The active components of the second deodorizing active ingredient include one or more of amino acid derivatives, organic acid buffer systems, and porous mineral particles. The second deodorizing active ingredient mainly acts on polar and acidic / alkaline odor molecules through chemical bonding (amino acids and aldehydes), acid-base neutralization (buffer systems for ammonia and amines), and auxiliary physical adsorption (porous particles).

[0034] Amino acid derivatives can rapidly chemically bond and immobilize aldehyde pollutants (such as formaldehyde) through Schiff base reactions; organic acid buffer systems can instantly neutralize alkaline odor molecules (such as ammonia and amines); porous mineral particles provide physical adsorption sites.

[0035] When the first and second deodorizing active ingredients are combined, they produce a synergistic effect, achieving a closed loop of "capture-lock-decomposition" of odor molecules across the entire spectrum in the room.

[0036] In some embodiments, the second deodorizing active ingredient includes amino acids, organic acids, potassium dihydrogen phosphate, and dipotassium hydrogen phosphate. Potassium dihydrogen phosphate and dipotassium hydrogen phosphate constitute a buffer system to maintain the pH stability of the local microenvironment of the functional layer, creating suitable conditions for the deodorization reaction.

[0037] In some embodiments, the second deodorizing active ingredient further includes a co-humectant. The co-humectant helps maintain the humidity of the functional layer, preventing the deactivation or crystallization of certain active ingredients (such as amino acids, organic acids, etc.) due to dry environmental conditions, thereby slowing down the deactivation rate of the functional ingredients. Preferably, the co-humectant is selected from one or more of glycerol, propane-1,2-diol, and sugar alcohols. Glycerol (glycerol) is the most commonly used humectant; its hydroxyl groups can form hydrogen bonds with water, exhibiting strong hygroscopicity. Propane-1,2-diol (propylene glycol) also has good moisturizing properties. Sugar alcohols (such as xylitol, sorbitol, etc.) can also be used as co-humectants due to their significant hygroscopic and moisturizing properties.

[0038] In some embodiments, the mass ratio of the first deodorizing active ingredient to the second deodorizing active ingredient is 1:0.5 to 1:2, such as 1:0.7, 1:1.1, 1:1.5, 1:1.8, etc. This ratio range ensures that the surface rapid-reaction layer (dominated by the second deodorizing active ingredient) has sufficient capacity to cope with the initial high-concentration pollution impact, while the internal long-lasting layer (dominated by the first deodorizing active ingredient) has sufficient reserves to ensure continuous purification capacity. If the ratio is too low (too little second deodorizing active ingredient in the surface protection and enhancement layers), the rapid response will be insufficient; if the ratio is too high (too much second deodorizing active ingredient in the surface protection and enhancement layers), it may affect the feel and breathability of the wallpaper, and is not cost-effective. Experiments have shown that within this ratio range, the combined use of the two ingredients significantly improves the overall removal efficiency of mixed pollutants such as isovaleric acid, ammonia, acetic acid, 2-nonenal, hydrogen sulfide, and toluene compared to the simple sum of the efficiencies of using either ingredient alone, demonstrating a significant synergistic effect.

[0039] In some embodiments, the adhesive is an environmentally friendly adhesive, preferably a modified acrylate emulsion or an aqueous polyurethane dispersion. The environmentally friendly adhesive uses a water-based system and has extremely low volatile organic compound (VOC) emissions, meeting environmental protection requirements.

[0040] In some embodiments, the glass transition temperature (Tg) of the adhesive is -10°C to 10°C. Adhesives within this range form a soft, slightly deformable "soft film" after film formation at room temperature. This allows for the firm encapsulation of functional components onto fibers without causing the film to crack or hinder the diffusion of contaminants into the interior due to excessive rigidity, thus achieving a balance between "firm fixation" and "effective mass transfer".

[0041] In some embodiments, the adhesive further comprises 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS). The introduction of AMPS can enhance the hydrophilicity and ion exchange capacity of the adhesive membrane, promote the transport of polar odor molecules to functional sites, and further improve the capture efficiency of polar odor molecules.

[0042] The core of this invention's long-lasting, broad-spectrum, and synergistic deodorization lies in constructing an intelligent deodorization microsystem based on "depth gradient distribution" and "multi-mechanism dynamic synergy." Its principle is broken down as follows: Gradient distribution and role division of functional components: 1. Surface Protection and Enhancement Layer (dominated by Component B (second deodorizing active ingredient)): This layer serves as the "first line of defense against air pollutants through rapid reaction." Amino acid derivatives rapidly chemically bond and immobilize aldehyde pollutants (such as formaldehyde) via Schiff base reactions; organic acid buffer systems instantly neutralize alkaline odor molecules (such as ammonia and amines); and porous mineral particles provide physical adsorption sites. This layer is characterized by its rapid reaction, but some components may be consumed quickly due to direct exposure.

[0043] 2. Internal Functional Impregnation Layer (Dominated by Component A (First Deodorizing Active Ingredient)): Serving as the "long-lasting reserve and deep treatment core." Tea polyphenols and flavonoids possess strong antioxidant capabilities, continuously decomposing various organic pollutant molecules; the hydrophobic cavities of cyclodextrin derivatives (especially branched cyclodextrins) effectively encapsulate neutral and hydrophobic odor molecules (such as benzene compounds and hydrophobic compounds in body odor), forming stable host-guest complexes to achieve "lock-in." This layer is coated with a flexible adhesive membrane, deeply embedded in the fiber network, slowing down the loss and deactivation of active ingredients and providing long-lasting deodorizing capabilities.

[0044] 3. Multi-mechanism dynamic collaborative process: When mixed pollutants (such as formaldehyde, ammonia, acetic acid, and toluene) come into contact with wallpaper, the purification process is not a simple addition of the independent workings of each component, but a dynamic and synergistic "capture-lock-decomposition" closed loop: rapid capture and primary transformation: pollutants are first captured by the surface B layer. Alkaline substances are neutralized, and some aldehydes are fixed. The buffer system in the B layer maintains the pH stability of the local microenvironment, creating conditions for subsequent reactions.

[0045] Delivery and Deep Processing: Pollutants not fully processed by the B layer (especially neutral and hydrophobic molecules) diffuse inward and enter the A layer's domain. Cyclodextrins act like "molecular capsules," encapsulating and locking them in place to prevent them from escaping back into the air. Simultaneously, the antioxidants in the A layer (tea polyphenols, flavonoids) continuously oxidize and decompose various organic pollutants that have been partially transformed by the B layer or have diffused directly in, ultimately converting them into harmless small molecules.

[0046] Functional regeneration and long-lasting maintenance: The plant antioxidants in layer A are slowly consumed during the reaction, but their encapsulated structure and relatively concentrated concentration ensure long-lasting effects. The buffer system and humectants (glycerin, sugar alcohols) in layer B help maintain the humidity of the functional layer, preventing the inactivation of certain reactions due to dryness and slowing down the deactivation rate of functional components. AMPS can also be introduced into the adhesive to enhance the membrane's hydrophilicity and ion exchange capacity, promoting the transport of polar odor molecules to functional sites.

[0047] 4. The chemical and physical basis of the synergistic effect: The synergistic effect (1+1>2) discovered in the experiment stems from: Complementary action spectrum: A excels in sarin / hydrophobic / antioxidant properties, while B excels in polar / acid-base / rapid bonding. Together, they cover the entire spectrum of indoor odor molecules.

[0048] Optimized reaction pathway: The rapid fixation of aldehydes by layer B reduces the probability of them directly attacking the antioxidant components of layer A, thus protecting the long-term effectiveness of layer A; while the deep encapsulation and decomposition of hydrophobic molecules that layer B struggles to handle by layer A compensates for the shortcomings of layer B.

[0049] Structural protection: The gradient distribution structure avoids adverse interactions between components A and B during preparation or storage, ensuring that their respective activities are fully utilized in application.

[0050] Another aspect of the present invention provides a method for preparing the above-mentioned long-lasting multi-mechanism synergistic deodorizing seamless wall covering, comprising the following steps: S1. Substrate Pretreatment The substrate layer undergoes surface pretreatment to improve its surface energy and hydrophilicity. In some embodiments, the surface treatment is corona treatment or low-temperature plasma treatment. Corona treatment introduces polar groups onto the fiber surface by applying high-frequency, high-voltage electricity between electrodes to ionize the air and generate corona discharge; low-temperature plasma treatment uses active particles in the plasma to modify the fiber surface. Both methods can effectively improve the surface energy of the substrate and enhance the bonding force between the functional material and the substrate in subsequent padding processes.

[0051] S2. Preparation and padding of functional padding solution A first deodorizing composition including a first deodorizing active ingredient is mixed with an adhesive, a wetting agent, and water to prepare a padding working solution, which is then used to pad the pretreated substrate.

[0052] In some embodiments, the solid content of the padding working fluid can be 15% to 30%, for example, 18%, 22%, 26%, 29%, etc. The selection of this solid content range is based on actual technical requirements. If the solid content is below 15%, the substrate's loading of the first deodorizing active ingredient is insufficient, failing to provide a long-lasting and stable basic deodorizing capability for the final product, leading to excessively rapid degradation of the product's deodorizing performance. If the solid content is above 30%, the viscosity of the padding working fluid will significantly increase. On the one hand, this will reduce the storage stability of the working fluid, making it prone to stratification and clumping. On the other hand, it will lead to uneven adsorption of the working fluid on the substrate surface during padding, easily resulting in defects such as localized enrichment or deficiency of functional components, thus affecting the consistency of the final product's deodorizing effect. It will also increase the energy consumption of subsequent drying processes, affecting production efficiency.

[0053] The temperature of the working fluid during padding can be 40~60℃, for example, 44℃, 49℃, 55℃, 58℃, etc. Appropriate heating can reduce the viscosity of the working fluid and improve its permeability. The padding speed can be 2~5 meters / minute, and the roll-off rate can be 70%~90%, for example, 75%, 80%, 84%, 88%, etc. The roll-off rate refers to the percentage of the mass of working fluid carried by the substrate after padding relative to the dry weight of the substrate before padding. This range ensures sufficient penetration of the functional material while avoiding waste of the working fluid.

[0054] The preparation of the first deodorizing composition in step S2 may include the following steps: stirring the mixture of the first deodorizing active ingredient and water at 25~40°C at a speed of 300~550 r / min for at least 10 min to ensure that all components in the first deodorizing composition are fully dissolved and uniformly dispersed, which is beneficial to the stable progress of the subsequent padding process. The resulting composition can be filtered to remove impurities. During preparation, the solid content of the first deodorizing composition can be controlled at 10%~30%. This range ensures that the first deodorizing active ingredient is present at a suitable concentration, which is convenient for subsequent dilution and preparation of the padding working solution, and can also avoid the decrease in storage stability due to excessive concentration. Preferably, it is 14%~20%.

[0055] When formulating the first deodorizing composition, plasticizers / dispersants, such as glycerin, may also be added to improve the processing performance of subsequent functional layers and the flexibility of the film.

[0056] Before preparing the padding working solution, the adhesive can also be pre-prepared as an aqueous solution to ensure that all components are fully dissolved and uniformly mixed. The mass ratio of the adhesive in the aqueous solution can be 6% to 20%, and the pH should be maintained between 6.5 and 8 to maintain the stability of the adhesive emulsion and avoid adverse effects on the subsequently added functional components (the first deodorizing active ingredient).

[0057] S3. First Stage Drying and Curing The impregnated substrate is dried to allow the adhesive to initially form a film, thus fixing the first deodorizing active ingredient onto the substrate.

[0058] In some embodiments, the drying in step S3 is carried out at 100~120°C for 2~4 minutes, for example, at 105°C for 3 minutes, at 110°C for 2 minutes, at 117°C for 2.5 minutes, etc. This stage employs a medium-temperature rapid drying process, which can promote the rapid formation of a preliminary solidified structure of the adhesive, firmly locking the first deodorizing active ingredient and the adhesive within the fiber network of the substrate, effectively preventing their migration and loss in subsequent processes, and laying the foundation for subsequent surface spraying and curing processes.

[0059] S4. Preparation and application of surface-enhancing solution The second deodorizing composition, which includes the second deodorizing active ingredient, is mixed with water to prepare a spraying solution, which is then applied to the surface of the semi-finished product obtained in step S3.

[0060] In some embodiments, the spraying liquid further includes one or both of a leveling agent and a mildew inhibitor. The leveling agent helps form a uniform and continuous film, while the mildew inhibitor enhances the product's resistance to mold. In some embodiments, the solid content of the spraying liquid is 5% to 15%, for example, 7%, 10%, 13%, etc., and the coating amount is 10 to 30 g / m². 2 For example, 14 g / m 2 19 g / m 2 23 g / m 2 27g / m 2 The selection of solid content and coating amount must balance deodorization effect and product feel. If the solid content or coating amount is too low, an effective active protective layer cannot be formed on the surface of the semi-finished product, resulting in a slow initial deodorization response and poor deodorization effect. If the solid content or coating amount is too high, it will cause the wallpaper surface to become sticky and reduce the breathability of the substrate, thus affecting the user experience (such as stuffiness and discomfort after being applied to the wall). Precision spraying is preferred as the coating method to ensure the uniformity and controllable thickness of the coating.

[0061] The preparation of the second deodorizing composition in step S4 may include the following steps: stirring a mixture of the second deodorizing active ingredient, water, and an optional auxiliary humectant at 30-50°C for at least 20 minutes. The resulting composition may be filtered to remove impurities. During preparation, the solid content of the second deodorizing composition can be controlled at 8%-20%, which is beneficial for the full dissolution and stable storage of the second deodorizing active ingredient, and also facilitates precise control of the final solid content when subsequently diluting and preparing the spraying liquid, preferably 10%-15%. The further added auxiliary humectant can be used to maintain humidity and prevent the active ingredient from deactivating.

[0062] S5. Second Stage Low-Temperature Curing and Finished Product The coated semi-finished product is dried at low temperature to form a surface protection and enhancement layer, resulting in a long-lasting, multi-mechanism synergistic deodorizing seamless wall covering.

[0063] In some embodiments, the low-temperature drying in step S5 is carried out at 60-80°C for 3-6 minutes, for example, at 65°C for 5 minutes, at 70°C for 4.2 minutes, or at 76°C for 3.5 minutes. This stage uses slow drying at low temperature to avoid high temperature damage to heat-sensitive active substances such as amino acids and organic acids in the second deodorizing composition, while forming a dense and transparent surface protective and enhancing layer.

[0064] Furthermore, the seamless wall covering, after forming the surface protection and enhancement layer, can be further cooled, rolled up, and slit for easy transport and use.

[0065] Another aspect of the present invention provides the application of the long-lasting multi-mechanism synergistic deodorizing seamless wall covering as described above in improving indoor air quality. The wall covering is attached to the interior wall and continuously removes odor molecules from the air through the synergistic effect of the functional impregnation layer and the surface protection and enhancement layer.

[0066] The technical solution of the present invention will be described in detail below through specific embodiments, but the present invention is not limited to the following embodiments. Experimental methods not specifying specific conditions in the embodiments are generally performed under conventional conditions or as recommended by the manufacturer. Unless otherwise stated, all parts are parts by mass, and all percentages are percentages by mass.

[0067] Example 1 (1) Substrate pretreatment: 120 g / m 2 The polyester nonwoven fabric is subjected to corona treatment with a power of 300 W and a speed of 5 m / min to ensure that the surface tension of the substrate reaches more than 38 mN / m.

[0068] (2) Preparation of the first deodorizing composition A: Take 100 g of tea extract (tea polyphenol content ≥30%), 80 g of branched cyclodextrin, and 820 g of deionized water. Stir at 30℃ and 450 r / min for 20 min. After mixing evenly, filter to obtain the first deodorizing composition A, which has a solid content of 18% and an active ingredient (tea polyphenol + branched cyclodextrin) mass percentage of 18%.

[0069] (3) Preparation of the second deodorizing composition B: Take 60 g of L-lysine, 30 g of citric acid, 15 g of potassium dihydrogen phosphate, 15 g of dipotassium hydrogen phosphate, 20 g of glycerol, and 860 g of deionized water, heat to 40°C and stir for 30 min until clear, cool and filter to obtain the second deodorizing composition B, which has a solid content of 14% and an active ingredient (amino acid + organic acid + phosphate) mass percentage of 12%.

[0070] (4) Prepare environmentally friendly adhesive: Take 950 g of modified acrylic emulsion (Tg≈5℃, solid content 50%), 5 g of 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS), and 45 g of deionized water, mix them evenly, and adjust the pH to 7.5 with dilute ammonia water for later use.

[0071] (5) Preparation of padding working fluid: Mix 115 parts of the first deodorizing composition A, 380 parts of the above-mentioned environmentally friendly adhesive, 4 parts of wetting agent (non-ionic type) and 478.5 parts of deionized water, stir for 18 min at 28°C and 400 r / min, mix evenly to obtain padding working fluid with a solid content of 21.56%.

[0072] (6) Impregnation and High-Temperature Pre-curing: The pretreated substrate is fed into the impregnation equipment. The temperature of the impregnation liquid is stabilized at 50℃, and the substrate running speed is controlled at 3 m / min and the impregnation pressure at 0.3 MPa. The roll-off rate after impregnation is controlled at 80%. The impregnation treatment allows the first deodorizing composition A to penetrate into the interior of the substrate fiber. Subsequently, the substrate is placed in a 110℃ oven for drying for 3 minutes for high-temperature pre-curing. During this process, the adhesive melts and flows inside the fiber and anchors, directionally fixing the first deodorizing active ingredient to the inside and surface of the fiber, forming a functional impregnation area. It is calculated that 1 m 2 The active ingredient of the first deodorizing composition A contained in the substrate after impregnation is approximately 2.03 g.

[0073] (7) Preparation of surface enhancement liquid (spraying liquid): Mix 360 parts of the second deodorizing composition B, 1 part of the leveling agent (nonionic), 0.5 parts of the mildew inhibitor (isothiazolinone), and 638.5 parts of deionized water. Stir for 15 min at 25°C and 350 r / min until uniformly mixed to obtain a surface enhancement liquid with a solid content of 5.00%, wherein the active ingredient of the second deodorizing composition B accounts for 4.80%.

[0074] (8) Surface coating and low-temperature final curing: A precision spraying process is used to uniformly spray the surface enhancing liquid onto the surface of the pre-cured semi-finished product, controlling the coating amount to be 30 g / m². 2 The spraying pressure was 0.2 MPa and the spraying distance was 30 cm. After spraying, the substrate was placed in a 70℃ oven for 5 minutes for low-temperature final curing. This process forms a continuous and dense surface protective and enhancing layer without damaging the heat-sensitive active ingredients in the second deodorizing composition B. Finally, the finished wall covering, denoted as S1, is obtained by winding it up. The calculated mass of the active ingredient in the second deodorizing composition B after spraying is 1.44 g / m². 2The mass ratio of the active ingredients in the first deodorizing composition A to the second deodorizing composition B (i.e., the mass ratio of the first deodorizing active ingredient to the second deodorizing active ingredient) is 2.07:1.44≈1:0.70.

[0075] Example 2 (1) Substrate pretreatment: Same as in Example 1.

[0076] (2) Preparation of the first deodorizing composition A: Take 100 g of tea extract (tea polyphenol content ≥30%), 30 g of branched cyclodextrin, 10 g of glycerin and 860 g of deionized water, stir at 30℃ and 450 r / min for 20 min, filter after mixing evenly to obtain the first deodorizing composition A, with a solid content of 14% and an active ingredient (tea polyphenol + branched cyclodextrin) mass ratio of 14%.

[0077] (3) Preparation of the second deodorizing composition B: Take 50 g of L-lysine, 20 g of citric acid, 10 g of potassium dihydrogen phosphate, 10 g of dipotassium hydrogen phosphate, 10 g of sorbitol, 10 g of propylene glycol, and 890 g of deionized water, heat to 40°C and stir for 30 min until clear, cool and filter to obtain the second deodorizing composition B, with a solid content of 11% and an active ingredient (amino acid + organic acid + phosphate) mass percentage of 9%.

[0078] (4) Prepare environmentally friendly adhesive: Take 950 g of modified acrylic emulsion (Tg≈5℃, solid content 50%), 5 g of 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS), 5 g of glycerol, and 40 g of deionized water, mix them evenly, and adjust the pH to 7.5 with dilute ammonia water for later use.

[0079] (5) Preparation of padding working solution: Mix 150 parts of the first deodorizing composition A, 950 parts of the above-mentioned environmentally friendly adhesive, 4 parts of wetting agent, and 570 parts of deionized water to prepare a padding working solution (solid content approximately 29.9%). Process according to the same padding parameters as in Example 1 (padding solution temperature 50°C, speed 3 m / min, roll-off rate 80%), with high-temperature pre-curing conditions of 110°C × 3 min. Calculations show that 1 m... 2 The active ingredient mass of the first deodorizing composition A after substrate impregnation is 1.21 g.

[0080] (6) Preparation of spraying solution: Mix 653 parts of the second deodorizing composition B, 1 part of the leveling agent, 0.5 parts of the mildew inhibitor, and 345.5 parts of deionized water to prepare a spraying solution (solid content approximately 7.33%, of which the active ingredient of the second deodorizing composition B accounts for 5.88%). Apply the spraying solution according to the same parameters as in Example 1 (coating amount 30 g / m²). 2The mixture was sprayed and cured at a low temperature of 70℃ for 5 minutes. The calculated active ingredient mass of the second deodorizing composition B after spraying was 1.76 g / m³. 2 The mass ratio of the active ingredients in the first deodorizing composition A to the second deodorizing composition B is approximately 1:1.45 (1.21:1.76).

[0081] The resulting wallpaper was labeled S2. After testing, its deodorizing performance, long-lasting effect, scrub resistance and safety were comparable to those of S1, indicating that the preparation method of the present invention has good adaptability to different formulation compositions.

[0082] Comparative Example 1 The wall covering was made by impregnation and drying in one step using only the first deodorizing composition A and conventional process: the substrate pretreatment was the same as in Example 1; the impregnation solution was prepared as follows: 180 parts of the first deodorizing composition A, 380 parts of modified acrylic emulsion (Tg=5℃), 4 parts of wetting agent, and 436 parts of deionized water, with a solid content of 21.56%; the impregnation temperature was 50℃, the speed was 3 m / min, the roll-off rate was 80%, and then it was dried at 110℃ for 8 minutes (one-time drying), and the wall covering was rolled up and denoted as D1.

[0083] Comparative Example 2 The wall covering was made by impregnation and drying in one step using only the second deodorizing composition B and conventional process: the substrate pretreatment was the same as in Example 1; the impregnation solution was prepared with 432 parts of the second deodorizing composition B, 380 parts of low Tg acrylic emulsion, 4 parts of wetting agent, and 184 parts of deionized water, with a solid content of 23.72%; the impregnation temperature was 50°C, the speed was 3 m / min, the roll-off rate was 80%, and then it was dried at 110°C for 8 minutes (one-time drying), and the wall covering was rolled up and denoted as D2.

[0084] Comparative Example 3 After simply mixing the first deodorizing composition A and the second deodorizing composition B, the wall covering was prepared by one-time impregnation and drying: the substrate pretreatment was the same as in Example 1; the mixed impregnation liquid was prepared as follows: 180 parts of the first deodorizing composition A, 432 parts of the second deodorizing composition B, 380 parts of low Tg acrylic emulsion, 4 parts of wetting agent, and 14 parts of deionized water, with a solid content of 25.88%; impregnation was carried out according to the impregnation parameters of Example 1, followed by drying at 110°C for 8 minutes (one-time drying), and the wall covering was rolled up and denoted as D3.

[0085] Comparative Example 4 Simulate multi-layer independent layer structure Preparation of composite wall covering with three independent layers: bottom layer is 120 g / m 2 Polyester nonwoven fabric; the middle layer is a polypropylene meltblown adsorption layer loaded with zeolite (20wt%), with a basis weight of 50 g / m². 2 The surface layer is an acrylic coating loaded with nano-TiO2 (15wt%), with a coating amount of 30 g / m².2 The three layers are laminated together with hot melt adhesive and then rolled up to obtain the wallpaper, denoted as D4.

[0086] Comparative Example 5 High-temperature final curing destroys surface activity. This comparative example illustrates the necessity of the second-stage low-temperature drying in a stepwise temperature curing process for protecting the heat-sensitive active ingredients in the second deodorizing composition.

[0087] (1) Substrate pretreatment: Same as in Example 1.

[0088] (2) Preparation of the first deodorizing composition A: Same as in Example 1.

[0089] (3) Preparation of the second deodorizing composition B: Same as in Example 1.

[0090] (4) Prepare environmentally friendly adhesive: Same as in Example 1.

[0091] (5) Preparation of impregnation working fluid: Same as in Example 1.

[0092] (6) Impregnation and high-temperature pre-curing: Same as in Example 1. The pretreated substrate was impregnated at 50°C (80% roll-off), and then dried in an oven at 110°C for 3 minutes to allow the adhesive to initially form a film, fixing the first deodorizing active ingredient to the interior and surface of the substrate fibers, forming a functional impregnated area. Calculations show that 1 m 2 The active ingredient (i.e. the first deodorizing active ingredient) of the first deodorizing composition A contained in the substrate has a mass of about 2.07 g, consistent with Example 1.

[0093] (7) Preparation of surface enhancement liquid (spraying liquid): Same as in Example 1.

[0094] (8) Surface coating and high-temperature final curing (process change): A precision spraying process is used to uniformly spray the surface enhancing liquid onto the surface of the pre-cured semi-finished product, with a coating amount of 30 g / m². 2 After spraying, instead of using a 70℃ low-temperature drying method, the material is directly placed in a 110℃ oven for 5 minutes for high-temperature final curing. During this process, the heat-sensitive active ingredients (amino acids, organic acids, etc.) in the second deodorizing composition B undergo partial decomposition or deactivation at high temperatures. The finished wall covering is obtained by winding, denoted as D5. Calculations show that the mass of the active ingredient (i.e., the second deodorizing active agent) in the second deodorizing composition B after spraying is 1.44 g / m². 2 Similar to Example 1, but due to high-temperature treatment, the actual effective activity is greatly reduced.

[0095] Comparative Example 5: A commercially available brand of activated carbon deodorizing wallpaper, denoted as C.

[0096] Performance test results: 1. Deodorization performance (ISO 17299 Annex Method): at 1 m 3 Inside a sealed chamber, a mixture of ammonia (100 ppm), acetic acid (30 ppm), and hydrogen sulfide (20 ppm) was injected initially. The removal rates of each target gas were tested after 72 hours. The test results are shown in Table 1 below.

[0097] Table 1

[0098] As can be seen from Table 1, the wall coverings (S1, S2) of the present invention can achieve a removal rate of more than 95% for ammonia, acetic acid and hydrogen sulfide, and can effectively remove a variety of pollutants.

[0099] Moreover, compared to wall coverings (D3) that are simply mixed and then impregnated once, the overall removal rate of the wall coverings (S1, S2) of the present invention is increased from 83% to over 95%, demonstrating that the synergistic effect of spatial distribution is significantly better than that of simple physical mixing.

[0100] 2. Long-term effectiveness test The sample was placed in a xenon lamp aging test chamber (irradiance 0.51 W / m²). 2 The sample was continuously irradiated with 340 nm (black panel temperature 65℃) for 500 hours. The retention rate of the deodorization performance of the sample for the mixed gas after irradiation was tested. The results are shown in Table 2 below.

[0101] Table 2

[0102] As can be seen from Table 2, after accelerated aging test, the deodorization performance retention rate of the product of this invention reached over 86%, which is significantly higher than that of the comparative example.

[0103] 3. Scrub resistance test According to GB / T 34844-2017 standard, the samples were subjected to wet scrubbing test. After 100 scrubbing cycles, the surface condition was observed and the deodorization performance degradation rate was tested. The results are shown in Table 3 below.

[0104] Table 3

[0105] As can be seen from Table 3, the product of the present invention exhibits a performance degradation rate of less than 5% after 100 wet scrubbing cycles, with no surface damage or fuzzing, demonstrating significantly superior scrubbing resistance compared to the comparative example.

[0106] 4. Security Testing All samples were tested according to GB 18585-2023 standard and met the requirements of the national mandatory standard. The formaldehyde emission of wall coverings S1 and S2 obtained in Examples 1 and 2 of this invention was <0.01 mg / m². 2 TVOC release ≤0.05 mg / m³ 2 As can be seen from h, the wallpaper of the present invention has a high level of security. The test results are shown in Table 4 below.

[0107] Table 4

[0108] As shown in Table 4, samples S1 and S2 obtained in the embodiments of the present invention exhibited the best performance in terms of formaldehyde and TVOC emissions, which were far below the national standard limits. Data from sample D5 obtained in Comparative Example 5 further confirms that the stepwise temperature curing process adopted in this invention (high-temperature pre-curing of the functional padding layer + low-temperature final curing of the surface protection and enhancement layer) is not only crucial for protecting the heat-sensitive active ingredients in the second deodorizing composition and maintaining deodorizing performance, but also plays an irreplaceable role in inhibiting the decomposition of heat-sensitive ingredients and ensuring the low VOC emission characteristics of the product.

[0109] As can be seen from the above, this invention, through its innovative "dual-layer functional structure design" and "specific synergistic compounding system," combined with a suitable process, successfully transforms high-performance deodorizing components into a long-lasting, broad-spectrum, and stable deodorizing product suitable for wallpaper carriers. Its overall performance far surpasses existing technologies, as detailed below: 1. This invention achieves a gradient distribution of the functional system along the same substrate thickness direction through a two-layer process of "internal impregnation and anchoring + surface spraying enhancement," which differs from the structure of multiple independent layers physically superimposed in existing technologies. The first deodorizing active ingredient is anchored inside the substrate fibers, providing long-lasting basic deodorization capability; the second deodorizing active ingredient forms an active protective layer on the surface, preferentially contacting and rapidly neutralizing pollutants. This gradient structure ensures both long-lasting effectiveness and rapid initial response capability, while avoiding the problems of weak interfacial bonding and easy peeling in multi-layer independent layer structures.

[0110] 2. This invention combines a primary deodorizing active ingredient (such as cyclodextrin and tea polyphenols) that primarily functions through physical inclusion and chemical oxidation with a secondary deodorizing active ingredient (such as amino acids and organic acid salt buffer pairs) that primarily functions through reversible chemical bonding and acid-base neutralization. Physical inclusion captures various neutral odor molecules, chemical oxidation decomposes some organic matter, reversible chemical bonding selectively binds to acidic and alkaline gases, and acid-base neutralization is a direct reaction. These four mechanisms work synergistically to achieve broad-spectrum and highly efficient removal of various odor molecules, including ammonia, acetic acid, and hydrogen sulfide.

[0111] 3. This invention employs a step-by-step temperature-controlled curing process: The first step, high-temperature curing (100~120℃), melts and anchors the adhesive within the fiber, directionally fixing the first deodorizing active ingredient inside the fiber to form a stable "functional library." The second step, low-temperature curing (60~80℃), forms a continuous and dense surface protective layer without damaging the heat-sensitive active ingredients (second deodorizing active ingredient) such as amino acids and organic acids in the second deodorizing composition. This process achieves the coexistence and synergy of two deodorizing active ingredients with different heat sensitivity on the same substrate, which cannot be achieved by conventional single-stage drying processes. Accelerated aging tests show that the deodorizing performance retention rate of the product of this invention reaches over 86%, significantly higher than the comparative example.

[0112] 4. Because the primary deodorizing active ingredient is anchored within the fiber rather than simply adhering to the surface, it exhibits excellent scrub resistance and long-lasting effectiveness. After 500 hours of accelerated aging testing, the deodorizing performance retention rate is >86%; after 100 wet scrubbing cycles, the performance degradation rate is <5%, with no surface damage or fuzzing.

[0113] 5. All functional layers utilize a water-based system, with formaldehyde emission levels <0.01 mg / m³. 2 TVOC release ≤0.05 mg / m³ 2 •h, which is far below the national standard limit.

[0114] 6. The preparation method of the present invention can be integrated with the impregnation, coating and drying processes of existing wallcovering production lines, with low modification costs and is suitable for large-scale production.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention 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 the present invention.

Claims

1. A long-lasting, multi-mechanism synergistic deodorizing seamless wall covering, characterized in that, include: basal layer; The functional padding region is formed by a composition comprising a first deodorizing active ingredient and an adhesive, which is penetrated and fixed to the interior and surface of the fibers of the base layer through a padding process. A surface protection and enhancement layer is disposed on a surface of at least one side of a base layer in which the functional padding region has been formed, covering the functional padding region and the base layer surface not covered by the functional padding region, the surface protection and enhancement layer comprising a second deodorizing active ingredient. The first deodorizing active ingredient and the second deodorizing active ingredient work synergistically to remove odor molecules through different mechanisms of action.

2. The long-lasting, multi-mechanism synergistic deodorizing seamless wallcovering according to claim 1, characterized in that, The first deodorizing active ingredient includes natural plant extracts, and the first deodorizing active ingredient includes one or more of tea polyphenols, cyclodextrin derivatives and flavonoids; The second deodorizing active ingredient is an organic-inorganic composite deodorizer, which includes one or more of amino acid derivatives, organic acid buffer systems, and porous mineral particles.

3. The long-lasting, multi-mechanism synergistic deodorizing seamless wallcovering according to claim 1, characterized in that, The first deodorizing active ingredient includes branched-chain cyclodextrin and tea extract; The second deodorizing active ingredient includes amino acids, organic acids, potassium dihydrogen phosphate, and dipotassium hydrogen phosphate; The surface protection and enhancement layer also includes an auxiliary moisturizer; The auxiliary moisturizer is selected from one or more of glycerin, propane-1,2-diol and sugar alcohols; The mass ratio of the first deodorizing active ingredient to the second deodorizing active ingredient is 1:0.5 to 1:

2.

4. The long-lasting, multi-mechanism synergistic deodorizing seamless wallcovering according to any one of claims 1 to 3, characterized in that, The adhesive is an environmentally friendly adhesive, which is a modified acrylic emulsion or an aqueous polyurethane dispersion, and the glass transition temperature of the adhesive is -10℃ to 10℃. The adhesive also contains 2-acryloylamino-2-methyl-1-propanesulfonic acid; The base layer is a nonwoven fabric that has been treated with corona or low-temperature plasma.

5. A method for preparing a long-lasting, multi-mechanism synergistic deodorizing seamless wallcovering as described in any one of claims 1 to 4, characterized in that, Includes the following steps: S1. Perform surface pretreatment on the substrate to improve its surface energy and hydrophilicity; S2. A first deodorizing composition including a first deodorizing active ingredient is mixed with an adhesive, a wetting agent and water to prepare a padding working solution, and the pretreated substrate is subjected to padding treatment. S3. Dry the impregnated substrate to allow the adhesive to initially form a film, thus fixing the first deodorizing active ingredient onto the substrate; S4. Mix the second deodorizing composition, which includes the second deodorizing active ingredient, with water to prepare a spraying solution, and apply it to the surface of the semi-finished product obtained in step S3; S5. The coated semi-finished product is dried at low temperature to form a surface protection and enhancement layer, thereby obtaining the long-lasting multi-mechanism synergistic deodorizing seamless wall covering.

6. The preparation method according to claim 5, characterized in that, The surface pretreatment described in step S1 is corona treatment or low-temperature plasma treatment; The solid content of the working fluid in step S2 is 15%~30%, the temperature of the working fluid during rolling is 40~60℃, the rolling speed is 2~5 m / min, and the roll residue rate is 70%~90%.

7. The preparation method according to claim 5, characterized in that, The drying in step S3 is carried out at 100~120℃ for 2~4 minutes.

8. The preparation method according to any one of claims 5 to 7, characterized in that, The spraying liquid mentioned in step S4 also includes one or both of leveling agents and mildew inhibitors; The solid content of the spraying liquid is 5%~15%, and the coating amount is 10~30 g / m². 2 .

9. The preparation method according to any one of claims 5 to 7, characterized in that, The low-temperature drying in step S5 is carried out at 60~80℃ for 3~6 minutes.

10. The application of a long-lasting, multi-mechanism synergistic deodorizing seamless wall covering as described in any one of claims 1 to 4 in improving indoor air quality, characterized in that... The long-lasting, multi-mechanism synergistic deodorizing seamless wall covering is attached to the interior wall surface. Through the synergistic effect of the functional impregnation layer and the surface protection and enhancement layer, it continuously removes odor molecules from the air.

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