Liquid absorbing cotton, preparation method thereof and liquid heating device

Abstract

The invention relates to the technical field of liquid absorbing materials, in particular to liquid absorbing cotton, a preparation method thereof and a liquid heating device. The liquid absorbing cotton comprises lyophilic cloth, elastic porous cloth and liquid locking cloth which are sequentially arranged in a stacked mode in the thickness direction. The liquid locking cloth comprises a cloth base body and liquid absorbing resin particles dispersed in the cloth base body. And the lyophilic cloth is beneficial to quickly absorbing liquid. The elastic porous cloth can play a role of a supporting layer and can also provide a larger liquid storage space. The liquid-absorbing resin particles in the liquid-locking cloth have extremely high liquid-absorbing and liquid-locking performance, the leakage risk is reduced, the volume of the liquid-absorbing resin particles is expanded after liquid absorption, pores in the cloth base body are filled, and the liquid-locking performance of the whole liquid-locking cloth is improved. Therefore, the liquid absorption cotton forms a synergistic effect of liquid absorption and diversion-supporting and storage-liquid locking and leakage prevention, a large amount of liquid can be absorbed, the risk of liquid leakage is effectively reduced, good structural integrity can be kept in long-term use, and the liquid absorption cotton is particularly suitable for absorbing accumulated liquid in a liquid heating device.

Description

Technical Field

[0001] This application relates to the field of liquid-absorbing materials technology, and in particular to liquid-absorbing cotton and its preparation method, and liquid heating device. Background Technology

[0002] Liquid heating devices can vaporize liquids into a mist for users to inhale. However, these devices are prone to condensation or leakage, which can lead to liquid accumulation at the bottom. This accumulation needs to be absorbed promptly to prevent leakage from the device's outlet, affecting user experience and device hygiene. In severe cases, it can even damage the device's circuitry and cause a short circuit.

[0003] Existing technologies often place ordinary absorbent cotton or sponges at the bottom of the device to absorb accumulated liquid; however, their absorption effect is limited, and problems such as leakage will still occur after long-term use. Summary of the Invention

[0004] The purpose of this application is to provide absorbent cotton and its preparation method, as well as a liquid heating device, in order to solve the problem that liquid accumulation exists in the liquid heating device and the existing treatment methods have limited improvement effects.

[0005] To achieve the above-mentioned objectives, the technical solution adopted in this application is as follows: In a first aspect, this application provides an absorbent cotton, comprising a hydrophilic fabric, an elastic porous fabric, and a liquid-locking fabric stacked sequentially along the thickness direction; The liquid-locking fabric includes a fabric matrix and liquid-absorbing resin particles dispersed in the fabric matrix.

[0006] This absorbent cotton comprises three layers of fabric. The hydrophilic fabric is located on the top layer, facilitating rapid absorption and introduction of liquid, reducing liquid residue on the surface. The elastic porous fabric is located in the middle layer. Due to its elasticity, it is initially compressed under external pressure, but recovers its shape and structure when the pressure decreases, thus acting as a support layer. This improves the structural stability of the entire absorbent cotton and reduces the risk of failure due to compression during long-term use. Simultaneously, its porous structure provides a large liquid storage space, effectively accommodating liquid introduced by the hydrophilic fabric. When the storage space is saturated, the seeping liquid is captured by the liquid-locking layer. The liquid-locking fabric is located at the bottom layer of the entire absorbent cotton. The fabric matrix forms the structural framework of this layer, and the absorbent resin particles within it possess extremely strong liquid absorption and locking properties. They can actively absorb large amounts of moisture and fix liquid molecules within the network structure of polymer chains, reducing the risk of leakage. After absorbing liquid, the absorbent resin particles expand in volume, which helps fill the pores inside the fabric matrix, further improving the overall liquid-locking performance of the fabric. Therefore, the liquid-locking fabric forms the final layer of liquid-locking and leak-proof barrier. Thus, the absorbent cotton of this application achieves a synergistic effect of liquid absorption and diversion, support and storage, and liquid-locking and leak-proofing. Liquid sequentially passes through the hydrophilic fabric, the elastic porous fabric, and the liquid-locking fabric. The absorbent cotton can absorb a large amount of liquid while effectively reducing the risk of leakage. It maintains good structural integrity and liquid absorption efficiency during long-term use, making it particularly suitable for absorbing accumulated liquid in liquid heating devices.

[0007] Optionally, the liquid-absorbing resin particles satisfy at least one of the following characteristics: (1) The absorbent resin particles contain at least one of polyacrylate, polyvinyl alcohol, polyacrylamide, carboxymethyl cellulose, polyurethane, and chitosan; (2) The particle size of the liquid-absorbing resin particles is 75 μm to 150 μm; (3) The mass percentage of absorbent resin particles in the liquid-locking fabric is 20% to 60%; (4) The weight average molecular weight of the absorbent resin particles is 500,000 to 5,000,000.

[0008] Optionally, the liquid-locking fabric satisfies at least one of the following characteristics: (1) The absorbent resin particles fill the pores of the fabric matrix, and the fabric matrix contains fibers, and at least some of the fibers penetrate into the absorbent resin particles; (2) The porosity of the fabric matrix is ​​75%–95%; (3) The pore size of the fabric matrix is ​​30 μm to 80 μm; (4) The thickness of the fabric substrate is 0.5 mm to 2 mm, and the weight is 25 gsm to 200 gsm; (5) The fabric matrix contains at least one of polyester fiber, polyethylene fiber, and polypropylene fiber; (6) The fabric matrix includes non-woven fabric.

[0009] Optionally, the elastic porous fabric satisfies at least one of the following characteristics: (1) The elastic deformation recovery rate of the elastic porous fabric is ≥95%; (2) The porosity of the elastic porous fabric is ≥90%; (3) The pore size of the elastic porous fabric is 70 μm to 120 μm; (4) The elastic porous fabric contains at least one of polyethylene terephthalate fiber, polyethylene fiber, polypropylene fiber, polyamide fiber, and polylactic acid fiber; (5) The thickness of the elastic porous fabric is 0.5 mm to 9 mm, and the weight is 100 gsm to 1500 gsm; (6) Elastic porous fabrics include nonwoven fabrics; (7) The pore size of the elastic porous fabric is larger than that of the hydrophilic fabric.

[0010] Optionally, fiber entanglement is formed between the hydrophilic fabric and the elastic porous fabric, and between the elastic porous fabric and the liquid-locking fabric; and / or, Hydrophilic fabrics satisfy at least one of the following characteristics: (1) The contact angle of the hydrophilic fabric is 0° to 30°; (2) The hydrophilic fabric contains at least one of natural fibers and regenerated fibers; (3) The thickness of the hydrophilic fabric is 0.1 mm to 0.8 mm, and the basis weight is 15 gsm to 100 gsm; (4) Hygrophilic fabrics include nonwoven fabrics; (5) The porosity of the hydrophilic fabric is 80%–95%; (6) The pore size of the hydrophilic fabric is 20 μm to 80 μm.

[0011] Secondly, this application provides a method for preparing absorbent cotton, comprising the following steps: Liquid-absorbing resin particles are dispersed in the fabric matrix to obtain liquid-locking fabric; By layering hydrophilic fabric, elastic porous fabric, and liquid-locking fabric sequentially along the thickness direction, absorbent cotton is obtained.

[0012] The preparation method of this application first disperses liquid-absorbing resin particles in a fabric matrix to form a composite structure with excellent liquid-locking properties, resulting in a liquid-locking fabric. This fabric can absorb a large amount of liquid and form a hydrogel-like substance, firmly locking in the moisture. It also expands in volume to fill the pores of the fabric matrix, increasing density and further reducing leakage. Then, three types of fabrics are layered sequentially. The hydrophilic fabric has hydrophilic and liquid-absorbing properties, while the elastic porous fabric provides structural support and liquid storage space. When the elastic porous fabric becomes saturated and overflows, the liquid-locking fabric actively captures and locks in the liquid. The entire absorbent cotton achieves a synergistic effect of liquid absorption and diversion, support and storage, and liquid-locking for leak prevention. This preparation method has a controllable process, and the resulting absorbent cotton has a stable structure with stable and reliable liquid absorption, liquid-locking, and leak-proof effects.

[0013] Optionally, dispersing the absorbent resin particles in the fabric matrix includes the following steps: The fiber raw material of the fabric matrix is ​​web-laid to obtain a fiber aggregate; Liquid-absorbing resin particles are dispersed in fiber aggregates and then subjected to hot calendering to obtain a composite film. The composite membrane is reinforced so that the fiber materials are entangled with each other, and at least some of the fiber materials penetrate into the absorbent resin particles.

[0014] Optionally, the hot calendering treatment temperature is 100℃~120℃; and / or, The pressure during hot rolling is 0.5 MPa to 1 MPa; and / or, The reinforcement treatment includes needle puncture.

[0015] Optionally, the absorbent resin particles contain at least one of polyacrylate, polyvinyl alcohol, polyacrylamide, carboxymethyl cellulose, polyurethane, and chitosan; and / or, The particle size of the absorbent resin particles is 100 mesh to 200 mesh; and / or, The mass ratio of absorbent resin particles to fabric matrix is ​​(0.25–1.5):1; and / or, The fiber raw materials of the fabric matrix include at least one of polyester fiber, polyethylene fiber, and polypropylene fiber.

[0016] Optionally, the raw material for the elastic porous fabric includes at least one selected from polyethylene terephthalate fiber, polyethylene fiber, polypropylene fiber, polyamide fiber, and polylactic acid fiber; and / or, Elastic porous fabrics are made by needle-punching fibers; and / or, The raw materials for hydrophilic fabrics include at least one of natural fibers and regenerated fibers; and / or, Liquid-sensitive fabrics are made by hydroentangling fibers; and / or, After the layers are stacked, the process also includes a step of hot-pressing the stacked hydrophilic fabric, elastic porous fabric and liquid-locking fabric along the thickness direction.

[0017] Thirdly, this application provides a liquid heating device, including the liquid-absorbing cotton described above, or including the liquid-absorbing cotton prepared by the preparation method described above.

[0018] The liquid heating device of this application includes the aforementioned absorbent cotton. This absorbent cotton effectively absorbs and locks in large amounts of liquid, and it recovers its shape even under external pressure, making it highly leak-proof. Therefore, accumulated liquid in the liquid heating device can be absorbed and locked in promptly, and this effect remains stable over a long period, reducing the risk of leakage. The liquid heating device of this application offers excellent user experience, hygiene, and safety. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art 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.

[0020] Figure 1 This is a schematic diagram of the absorbent cotton structure in Embodiment 1 of this application; Figure 2 This is a schematic diagram of the structure of the absorbent cotton used in the liquid heating device according to Embodiment 1 of this application; Figure 3 This is a schematic diagram of the structure of the absorbent cotton used in the liquid heating device according to Embodiment 2 of this application; Figure label: 1-Absorbent cotton; 11-Liquid-absorbing fabric; 12-Elastic porous fabric; 13-Liquid-locking fabric; 2-Shell; 3- Suction nozzle; 4-Liquid storage assembly; 5-Power supply and circuit components. Detailed Implementation

[0021] To make the technical problems, technical solutions, and beneficial effects of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0022] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0023] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items.

[0024] It should be understood that in the various embodiments of this application, the order of the above processes does not imply the order of execution. Some or all steps may be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0025] The weights of the relevant components mentioned in the embodiments of this application can refer not only to the specific content of each component, but also to the proportional relationship between the weights of the components. Therefore, any scaling up or down of the content of the relevant components according to the embodiments of this application is within the scope disclosed in the embodiments of this application. Specifically, the mass in the embodiments of this application can be a well-known unit of mass in the chemical industry, such as µg, mg, g, or kg.

[0026] The terms "first" and "second" are used for descriptive purposes only, to distinguish objects, such as substances, from one another, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. For example, without departing from the scope of the embodiments of this application, a first feature may also be referred to as a second feature, and similarly, a second feature may also be referred to as a first feature. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0027] Liquid heating devices vaporize liquids into a mist for users to inhale. However, due to incomplete vaporization, temperature changes, or alterations in user actions, these vaporized components easily condense. Furthermore, the liquid itself may leak from the heating chamber due to environmental factors such as decreased pressure, high temperature, and high humidity. This condensate and seepage gradually flows to the bottom of the liquid heating device, forming a pooled liquid. The main components of this pooled liquid are a mixture of water, 1,2-propanediol, and glycerol. This pooled liquid can not only leak from the device outlet, affecting user experience and device hygiene, but in severe cases, it can also damage the device's electrical components, causing short circuits. Therefore, it is necessary to install a pooled liquid collection component in the liquid heating device to absorb this pooled liquid promptly.

[0028] Existing technologies often place ordinary absorbent cotton or sponges at the bottom of liquid heating devices to absorb accumulated liquid. However, these absorbent cottons or sponges have the following drawbacks: First, their absorption and leak-proof capabilities are insufficient: while ordinary absorbent cotton can absorb liquid, its absorption capacity is limited, and once saturated, the liquid can easily seep out under gravity or pressure, failing to prevent leakage. Second, their structural stability is poor: these liquid heating devices are generally space-constrained, and the absorbent cotton may collapse under long-term pressure, leading to a sharp reduction in the liquid storage space and a decline in absorption performance. Third, their functionality is limited: they only possess simple absorption functions and cannot simultaneously meet multiple requirements such as rapid flow diversion, large-capacity storage, and reliable leak prevention.

[0029] Therefore, there is an urgent need for a special absorbent cotton that can efficiently absorb, stably store, and effectively prevent liquid leakage, in order to solve the technical problems of insufficient performance of existing absorbent cotton.

[0030] Therefore, a first aspect of this application provides an absorbent cotton. The absorbent cotton includes a hydrophilic fabric, an elastic porous fabric, and a liquid-locking fabric, which are sequentially layered along the thickness direction. The liquid-locking fabric includes a fabric matrix and liquid-absorbing resin particles dispersed in the fabric matrix.

[0031] This embodiment of the absorbent cotton includes three layers of fabric. The hydrophilic fabric is located on the top layer of the absorbent cotton, which facilitates rapid absorption and introduction of liquid, reducing liquid residue on the outside. The elastic porous fabric is located in the middle layer of the absorbent cotton. Due to its elasticity, it is first compressed under external pressure, and when the external pressure decreases, the fabric can restore its shape and structure, thus acting as a support layer. This helps improve the structural stability of the entire absorbent cotton and reduces the risk of failure due to collapse during long-term use. At the same time, its porous structure provides a large liquid storage space, effectively accommodating the liquid introduced by the hydrophilic fabric. When the liquid storage is saturated, the seeping liquid is captured by the liquid-locking layer. The liquid-locking fabric is located at the bottom layer of the entire absorbent cotton. The fabric matrix forms the structural framework of this layer, and the absorbent resin particles within it possess extremely strong liquid absorption and locking properties. They can actively absorb large amounts of moisture and fix liquid molecules within the network structure of polymer chains, reducing the risk of leakage. After absorbing liquid, the absorbent resin particles expand in volume, which helps fill the pores inside the fabric matrix, further improving the overall liquid-locking performance of the fabric. Therefore, the liquid-locking fabric forms the final layer of liquid-locking and leak-proof barrier. Thus, the absorbent cotton in this embodiment achieves a synergistic effect of liquid absorption and guidance, support and storage, and liquid-locking and leak-proofing. Liquid sequentially passes through the hydrophilic fabric, the elastic porous fabric, and the liquid-locking fabric. The absorbent cotton can absorb a large amount of liquid while effectively reducing the risk of liquid leakage. It maintains good structural integrity and liquid absorption efficiency during long-term use, making it particularly suitable for absorbing accumulated liquid in liquid heating devices.

[0032] The following will provide a detailed description of each layer of fabric in the absorbent cotton.

[0033] The hydrophilic fabric is the top layer of the absorbent material that first comes into contact with the liquid. It possesses strong hydrophilicity, allowing it to quickly capture and absorb liquid and guide it into the fabric's interior, reducing liquid residue on the outside. In some embodiments, the hydrophilic fabric contains at least one of natural fibers and regenerated fibers. Optionally, natural fibers include at least one of cotton, linen, bamboo, wool, and silk fibers, while regenerated fibers include at least one of viscose and lyocell fibers. These fibers themselves have good hydrophilicity and wettability, effectively increasing the absorption rate of liquid by the hydrophilic fabric, enhancing the diffusion capacity of the liquid within the fabric, facilitating rapid liquid penetration into the fabric's interior, reducing liquid accumulation on the surface, and minimizing backflow of liquid from the fabric. In some embodiments, the contact angle of the hydrophilic fabric is 0° to 30°, optionally ≤30°, exhibiting good hydrophilicity. The liquids that absorbent cotton needs to absorb are mainly mixtures of water, 1,2-propanediol and glycerol. The above-mentioned materials or contact angles of the liquid-loving fabric are hydrophilic and have a high affinity for these alcohols. While absorbing water, the corresponding alcohol components will also be absorbed simultaneously.

[0034] In some embodiments, the hydrophilic fabric includes a nonwoven fabric, optionally a nonwoven fabric containing the aforementioned fibers. Compared to woven fabrics, the fibers in nonwoven fabrics are randomly entangled, with small differences in longitudinal and transverse properties, exhibiting isotropic characteristics and forming a disordered porous structure, which is beneficial for uniform and rapid absorption of liquids.

[0035] In some embodiments, the porosity of the hydrophilic fabric can be 80% to 95%, including but not limited to any value or any two of 80%, 85%, 90%, and 95%. Fabrics with appropriate porosity are conducive to forming abundant liquid-conducting channels, improving the permeability and diffusion efficiency of liquids, and promptly guiding the absorbed liquids to the elastic porous fabric in the middle layer. In some embodiments, the pore size of the hydrophilic fabric can be 20 μm to 80 μm, including but not limited to any value or any two of 20 μm, 40 μm, 60 μm, and 80 μm. Pore structures within these pore size ranges are conducive to forming capillary liquid-conducting channels, promoting the flow of liquids inside the hydrophilic fabric, reducing the risk of backflow, and effectively blocking impurities from entering the interior of the hydrophilic fabric, maintaining the unobstructed flow of liquid-conducting channels.

[0036] In some embodiments, the thickness of the hydrophilic fabric can be from 0.1 mm to 0.8 mm, including but not limited to any value or any two of 0.1 mm, 0.3 mm, 0.5 mm, and 0.8 mm. These thicknesses are beneficial for the hydrophilic fabric to have high liquid absorption and wicking properties. Correspondingly, the basis weight of the hydrophilic fabric can be from 15 gsm to 100 gsm, including but not limited to any value or any two of 15 gsm, 50 gsm, 75 gsm, and 100 gsm. The basis weight at a certain thickness can reflect the material usage in the fabric, reflecting the total mass of fibers within a certain volume, i.e., the bulk density. Therefore, it can reflect the density and pore distribution between fibers in the hydrophilic fabric. Thus, thickness and basis weight can also reflect the fabric's ability to absorb liquid and the rate of liquid penetration in the fabric. Hydrophilic fabrics within the above-mentioned thickness and basis weight range are conducive to forming abundant liquid-wicking channels, improving liquid absorption and wicking properties.

[0037] The elastic porous fabric in absorbent cotton is elastic. When subjected to external pressure, it will be compressed first. When the external pressure is reduced, the fabric can restore its shape and structure, so it can act as a support layer. At the same time, its porous structure can provide a large liquid storage space, effectively accommodating the liquid guided by the hydrophilic fabric.

[0038] In some embodiments, the elastic deformation recovery rate of the elastic porous fabric can be ≥95%, including but not limited to any value or a range between any two of 95%, 96%, 97%, 98%, and 99%. A higher elastic deformation recovery rate allows the elastic porous fabric to quickly recover its original shape and structure after the external pressure is released, so that the entire absorbent cotton maintains a certain thickness and structural stability. It is not easy to be flattened and unable to recover during long-term use, which is beneficial for the entire absorbent cotton to maintain its absorbency and liquid storage space.

[0039] In some embodiments, the porosity of the elastic porous fabric can be ≥90%, and can include, but is not limited to, any value or any two of 90%, 92%, 95%, and 98%. High porosity is beneficial for forming a continuous porous network structure within the fabric, which facilitates rapid liquid penetration and uniform distribution, and also helps to increase liquid storage capacity. In some embodiments, the pore size of the elastic porous fabric is 70 μm to 120 μm, and can include, but is not limited to, any value or any two of 70 μm, 80 μm, 100 μm, and 120 μm. This pore size range is beneficial for balancing liquid transport rate and storage capacity within the porous network.

[0040] In some embodiments, the thickness of the elastic porous fabric can be from 0.5 mm to 9 mm, including but not limited to any value or any two of 0.5 mm, 3 mm, 6 mm, and 9 mm. This thickness range is beneficial for the elastic porous fabric to have sufficient structural support and liquid storage space. Correspondingly, the basis weight of the elastic porous fabric can be from 100 gsm to 1500 gsm, including but not limited to any value or any two of 100 gsm, 680 gsm, 1000 gsm, and 1500 gsm. The basis weight at a certain thickness can reflect the fiber content in the hydrophilic fabric, reflecting the density and pore distribution between fibers. The above-mentioned thickness and basis weight range are beneficial for forming abundant liquid-conducting channels and a large liquid storage space within the elastic porous fabric.

[0041] In some embodiments, the elastic porous fabric contains at least one of polyethylene terephthalate (PET) fiber, polyethylene (PE) fiber, polypropylene (PP) fiber, polyamide (PA) fiber, and polylactic acid (PLA) fiber. These fibers have excellent resilience properties and can effectively maintain their original shape and porous structure after repeated external compression, which helps the elastic porous fabric maintain structural stability and maintain good liquid conductivity and liquid storage capacity during long-term use.

[0042] In some embodiments, the elastic porous fabric includes a nonwoven fabric, optionally a nonwoven fabric containing the aforementioned fibers. Compared to woven fabrics, the fibers in nonwoven fabrics are randomly entangled, with small differences in longitudinal and transverse properties, exhibiting isotropic characteristics and forming a disordered porous structure, which is beneficial for uniform and rapid absorption and storage of liquids. In some embodiments, fiber entanglement can form between the hydrophilic fabric and the elastic porous fabric, which helps to improve the interfacial bonding strength between the two and enhance the structural stability of the entire absorbent cotton.

[0043] The liquid-locking fabric in absorbent cotton uses a fabric matrix dispersed with absorbent resin particles. Absorbent resin, also known as superabsorbent polymer (SAP), has several advantages. First, its molecular chains contain hydrophilic groups such as hydroxyl, carboxyl, and sulfonic acid groups, which bind to water molecules through hydrogen bonding, resulting in extremely strong water absorption. It also has a high affinity for polyols. Second, the molecular chains in absorbent resin form a loose cross-linked network structure with extremely high liquid storage capacity, often capable of absorbing hundreds or thousands of times its own weight in liquid, exhibiting a very high liquid storage ratio. Third, after absorbing liquid, it firmly binds the liquid molecules within the cross-linked network structure, preventing leakage even under heated or pressurized conditions, thus giving absorbent resin excellent liquid-locking properties. Finally, the absorbed liquid molecules occupy space within the loose cross-linked molecular chain network, increasing the distance between the molecular chains and causing the cross-linked network to expand, resulting in a significant increase in volume after liquid absorption.

[0044] Based on the above characteristics of strong liquid absorption, high water storage, strong liquid locking, and volume expansion, the liquid to be absorbed mainly contains water, 1,2-propanediol, and glycerol. Therefore, the absorbent resin particles in the liquid-locking fabric can actively absorb, store, and lock in large amounts of liquid, forming a hydrogel-like substance. This process is irreversible or difficult to reverse, effectively locking in the liquid through chemical liquid locking. Simultaneously, the absorbent resin particles expand in volume after absorbing liquid, effectively filling the pores in the fabric matrix, further enhancing the density of the liquid-locking fabric and effectively reducing the risk of liquid leakage.

[0045] In some embodiments, the absorbent resin particles contain at least one of polyacrylate, polyvinyl alcohol (PVA), polyacrylamide (PAM), carboxymethyl cellulose, polyurethane, and chitosan, optionally polyacrylate such as sodium polyacrylate or potassium polyacrylate. Absorbent resin particles containing these materials further exhibit high absorbency, storage capacity, and liquid-locking properties. For example, polyacrylate contains abundant carboxyl groups, resulting in extremely strong absorbency, which is beneficial for improving the overall absorbency and leak-proof effect of the liquid-locking fabric. In some embodiments, the weight-average molecular weight of the absorbent resin particles is 500,000 to 5,000,000. These parameters ensure that the absorbent resin particles have suitable molecular chain length and degree of cross-linking, possessing both strong absorbency and a relatively loose cross-linked network structure. This facilitates the storage of more liquid and maintains good liquid-locking ability, preventing the absorption rate and storage capacity from being affected by excessively high cross-linking, and also preventing the gel strength and liquid-locking stability from being affected by excessively low cross-linking.

[0046] In some embodiments, the particle size of the absorbent resin particles is 75 μm to 150 μm, approximately 100 mesh to 200 mesh, and may include, but is not limited to, any value or a range between any two of 75 μm, 100 μm, 125 μm, 150 μm, 100 mesh, 120 mesh, 150 mesh, and 200 mesh. These particle sizes of absorbent resin particles are advantageous in balancing a faster absorption rate and a higher liquid storage capacity, and also allow for uniform dispersion within the fabric matrix, making it easier to fully absorb liquid and reducing the risk of missed absorption.

[0047] In some embodiments, the mass percentage of absorbent resin particles in the liquid-locking fabric is 20% to 60%, including but not limited to any value or a range between any two of 20%, 30%, 40%, 50%, and 60%. This content range is beneficial for the liquid-locking fabric to possess excellent absorbency and liquid-locking capabilities. If the content is too low, the absorbency and liquid-locking performance will be insufficient, while if the content is too high, it may lead to insufficient mechanical strength provided by the fabric matrix or resin particle aggregation affecting the uniformity of distribution. Therefore, these mass percentages are beneficial for the liquid-locking fabric to have both good mechanical properties and good absorbency and leak-proof effect.

[0048] In some embodiments, absorbent resin particles fill the pores of the fabric matrix, and the fabric matrix contains fibers, with at least some fibers penetrating the absorbent resin particles. This structural design allows the absorbent resin particles to be wrapped by a porous fiber network, while at least some fibers are also wrapped by the absorbent resin particles, forming a mutually wrapped, interwoven, and anchored structure. This significantly enhances the bonding strength and stability between the two, making it difficult for even small absorbent resin particles to detach from the fabric matrix before absorbing liquid and swelling. Therefore, this structural design ensures that the liquid-locking fabric maintains excellent liquid absorption and locking performance even under repeated use or pressure conditions, further improving the overall leak-proof effect of the absorbent cotton.

[0049] In some embodiments, the pore size of the fabric matrix can be 30 μm to 80 μm, including but not limited to any value or any two of 30 μm, 40 μm, 50 μm, 70 μm, and 80 μm. This pore size can be tested by low-temperature nitrogen adsorption. It should be noted that this pore size reflects the equivalent pore size at the narrow point of mass transfer in the porous material. In reality, the size of many pore cavities is larger than this pore size, which can accommodate liquid-absorbing resin particles. This pore size range is beneficial for uniformly accommodating liquid-absorbing resin particles and also facilitates liquid penetration into the fabric matrix and absorption and locking by the liquid-absorbing resin particles. In some embodiments, the porosity of the fabric matrix can be 75% to 95%, including but not limited to any value or any two of 75%, 85%, 90%, and 95%. This porosity range is beneficial for maintaining the structural stability of the fabric matrix, providing sufficient space to accommodate liquid-absorbing resin particles, and also facilitating liquid penetration into the fabric matrix and easy capture by the liquid-absorbing resin particles.

[0050] In some embodiments, the thickness of the fabric matrix can be from 0.5 mm to 2 mm, including but not limited to any value or any two of 0.5 mm, 1.0 mm, 1.5 mm, and 2.0 mm. This thickness is beneficial for the fabric matrix to have sufficient mechanical strength and to provide ample space for the absorbent resin particles, thereby improving the liquid-locking capacity. Correspondingly, the basis weight of the fabric matrix can be from 25 gsm to 200 gsm, including but not limited to any value or any two of 25 gsm, 60 gsm, 90 gsm, 150 gsm, and 200 gsm. The basis weight at a certain thickness can reflect the fiber content in the hydrophilic fabric, as well as the density and pore distribution between the fibers. The aforementioned thickness and basis weight range are beneficial for balancing structural stability and space for accommodating absorbent resin particles.

[0051] In some embodiments, the fabric matrix contains at least one of polyester fibers, polyethylene fibers, and polypropylene fibers. These fiber materials possess excellent mechanical strength, and the resulting fabric matrix can form a stable composite material with the absorbent resin particles, i.e., a liquid-locking fabric, serving as the final leak-proof barrier for the absorbent cotton. In some embodiments, the fabric matrix comprises a nonwoven fabric, optionally containing the aforementioned fibers. Compared to woven fabrics, the fibers in nonwoven fabrics are randomly entangled, with small differences in longitudinal and transverse properties, exhibiting isotropic characteristics and forming a disordered porous structure. This facilitates the timely absorption of liquid overflowing from the elastic porous fabric and provides sufficient space for the absorbent resin particles. In some embodiments, fiber entanglement can form between the elastic porous fabric and the liquid-locking fabric, which helps to improve the interfacial bonding strength between the two and enhances the overall structural stability of the absorbent cotton.

[0052] Among the three types of fabrics—hydrophilic fabric, elastic porous fabric, and liquid-locking fabric—the elastic porous fabric is the thickest and has the highest basis weight to provide sufficient support and resilience, as well as high storage capacity. Next is the liquid-locking fabric, which can be thicker than the hydrophilic fabric to accommodate more absorbent resin particles and increase liquid-locking capacity. Finally, the hydrophilic fabric primarily functions to quickly absorb liquid and shorten the liquid conduction path, rapidly introducing liquid into the elastic porous fabric. Regarding pore size, the elastic porous fabric has a larger pore size than the hydrophilic fabric to provide more liquid storage space and reduce backflow of liquid from the elastic porous fabric into the hydrophilic fabric.

[0053] A second aspect of this application provides a method for preparing absorbent cotton. The preparation method includes the following steps S10 to S20: S10: Disperse absorbent resin particles in the fabric matrix to obtain a liquid-locking fabric; S20: The hydrophilic fabric, elastic porous fabric and liquid-locking fabric are stacked sequentially along the thickness direction to obtain absorbent cotton.

[0054] The preparation method of this application first disperses liquid-absorbing resin particles in a fabric matrix to form a composite structure with excellent liquid-locking properties, resulting in a liquid-locking fabric. This fabric can absorb a large amount of liquid and form a hydrogel-like substance, firmly locking in the moisture. It also expands in volume to fill the pores of the fabric matrix, increasing density and further reducing leakage. Then, three types of fabrics are layered sequentially. The hydrophilic fabric has hydrophilic and liquid-absorbing properties, while the elastic porous fabric provides structural support and liquid storage space. When the elastic porous fabric becomes saturated with liquid and overflows, the liquid-locking fabric actively captures and locks in the liquid. The entire absorbent cotton achieves a synergistic effect of liquid absorption and diversion, support and storage, and liquid-locking and leak prevention. This preparation method is process-controllable, and the resulting absorbent cotton has a stable structure and stable and reliable liquid absorption, liquid-locking, and leak-proof effects.

[0055] Step S10 is the step of preparing the liquid-locking fabric, wherein the absorbent resin particles and fiber raw materials can be referred to the relevant descriptions in the above-described absorbent cotton examples. In the example, the absorbent resin particles contain at least one of polyacrylate, polyvinyl alcohol, polyacrylamide, carboxymethyl cellulose, polyurethane, and chitosan. In the example, the particle size of the absorbent resin particles is 100 mesh to 200 mesh. In the example, the fiber raw materials can include at least one of polyester fiber, polyethylene fiber, and polypropylene fiber. In the example, the mass ratio of absorbent resin particles to the fabric matrix is ​​(0.25 to 1.5):1, so that the mass percentage of absorbent resin particles in the prepared liquid-locking fabric is 20% to 60%. These materials and parameters are beneficial to the prepared liquid-locking fabric having high absorbency, liquid-locking, and leak-proof effects. The thickness, basis weight, porosity, pore size, and other parameters of the fabric matrix in the prepared liquid-locking fabric can also be referred to the relevant descriptions in the above-described absorbent cotton examples.

[0056] In some embodiments, dispersing absorbent resin particles in a fabric matrix may include the following steps S11 to S13: S11: The fiber raw material of the fabric matrix is ​​web-laid to obtain a fiber aggregate; S12: Disperse liquid-absorbing resin particles in fiber aggregates and perform hot calendering to obtain a composite film; S13: The composite membrane is reinforced so that the fiber materials are entangled with each other and at least some of the fiber materials penetrate into the absorbent resin particles.

[0057] The web-laying process in step S11 can include mechanical processing, airflow processing, etc. The web-laying process can process these loose and messy fiber raw materials into fiber aggregates with uniform thickness, distribution direction, and weight, also known as unreinforced nonwoven fabric.

[0058] Step S12 can uniformly disperse the absorbent resin particles in the fiber assembly, such as by sprinkling them onto the fiber assembly, where the particles will bind to the pores. Hot calendering softens the absorbent resin particles to a certain extent, allowing the fiber assembly containing the absorbent resin particles to initially take shape, resulting in a composite film of a certain thickness. In some embodiments, the hot calendering temperature can be 100℃~120℃, and the hot calendering pressure can be 0.5 MPa~1 MPa.

[0059] Step S13 is a reinforcement process. In some embodiments, the reinforcement process includes needle punching. Under the needle punching reinforcement process, the originally independent fiber materials change shape due to mechanical puncture, and the fibers intertwine and connect to form a complex and stable interwoven network structure, constituting the fabric matrix with extremely high strength and structural stability. During the reinforcement process, some fiber materials penetrate into the absorbent resin particles, which are distributed in the pores of the fabric matrix. This results in the absorbent resin particles being wrapped by the porous fiber network, and at least some fibers being wrapped by the absorbent resin particles, forming a mutually wrapped, interwoven, and anchored structure. This significantly improves the bonding strength and stability between the two, making the absorbent resin particles less likely to fall off, further improving the absorbency and liquid-locking performance of the resulting liquid-locking fabric.

[0060] S20 is a further step in making the fabrics into multi-layered absorbent cotton.

[0061] The fiber raw material used in the hydrophilic fabric can be selected as hydrophilic fiber, which may include at least one of natural fibers and regenerated fibers. The hydrophilic fabric can be obtained by hydroentangling the fibers. Hydroentangling uses high-pressure micro-flows of water to entangle loose fiber raw materials. Compared to the relatively strong and thick fabric produced by needle punching, hydroentangled fabric is relatively softer and fluffier, which is more conducive to improving the rapid water absorption effect of the hydrophilic fabric. The thickness, porosity, pore size, and other parameters of the obtained hydrophilic fabric can also be referred to the relevant descriptions in the absorbent cotton section of the above embodiments.

[0062] The fiber raw material used in the elastic porous fabric can be selected from fibers with high elasticity, including at least one of polyethylene terephthalate fiber, polyethylene fiber, polypropylene fiber, polyamide fiber, and polylactic acid fiber. The elastic porous fabric can be obtained by needle-punching the fibers. Needle-punching is a process in which the fibers become entangled through mechanical puncture. The thickness, porosity, pore size, and other parameters of the elastic porous fabric can be referenced from the relevant descriptions in the absorbent cotton section of the above embodiments.

[0063] By sequentially stacking prepared hydrophilic fabric, elastic porous fabric, and liquid-locking fabric along the thickness direction, a three-layer absorbent cotton is obtained. During liquid absorption, the liquid passes sequentially through the hydrophilic fabric and the elastic porous fabric. When the liquid overflows from the elastic porous fabric, the liquid-locking fabric actively absorbs and locks in the liquid. Through this synergistic effect of liquid absorption and diversion, support and storage, and liquid-locking to prevent leakage, a large amount of liquid can be absorbed, effectively reducing the risk of liquid leakage. In some embodiments, after stacking, a step of hot-pressing the stacked hydrophilic fabric, elastic porous fabric, and liquid-locking fabric along the thickness direction is further included. Hot-pressing allows for tight bonding between the fabric layers, and also forms fiber entanglement between the layers, enhancing the stability of the overall structure, while avoiding the impact of adhesives on material properties. In the example, the hot-pressing temperature can be 100℃~120℃, and the pressure can be 30 MPa~70 MPa.

[0064] A third aspect of this application provides a liquid heating device, including the absorbent cotton described in the above-described embodiments of this application, or the absorbent cotton prepared by the above-described preparation method of this application.

[0065] The liquid heating device of this application includes the aforementioned absorbent cotton. The absorbent cotton can effectively absorb and lock in a large amount of liquid, and it will recover its shape after being subjected to external pressure, making it difficult for the entire absorbent cotton to leak. Therefore, the liquid accumulated in the liquid heating device can be absorbed and locked in in a timely manner, and this effect remains stable over a long period, reducing the risk of leakage. The liquid heating device of this application provides a good user experience, hygiene, and safety.

[0066] In some embodiments, the liquid heating device is a device that can vaporize a liquid into vaporized components for a user to inhale, including but not limited to a power supply, heating component, liquid storage component, liquid guiding component, device outlet, and control component. The liquid heating device may have absorbent cotton, as described in the embodiments of this application, located at the bottom of the entire device cavity, for absorbing condensate or leaked liquid generated during the heating process, thereby improving the user experience, hygiene, and safety of the liquid heating device.

[0067] In some embodiments, such as Figure 2 As shown, the hydrophilic fabric 11, the elastic porous fabric 12, and the liquid-locking fabric 13 form the liquid-absorbing cotton 1, which is placed at the bottom of the housing 2 cavity of the liquid heating device and can absorb liquid in time.

[0068] In some embodiments, such as Figure 3 As shown, the liquid heating device includes a suction nozzle 3, a liquid storage component 4, and a power supply and circuit component 5. Absorbent cotton 1 is installed below each of these components to absorb the liquid promptly. The suction nozzle 3 is cylindrical, allowing vaporized components to flow from the device to the outside. The absorbent cotton 1 below it is annular, absorbing liquid generated on the sidewalls of the suction nozzle 3.

[0069] The following description is based on specific embodiments.

[0070] Example 1 This embodiment provides an absorbent cotton, such as Figure 1 As shown, the fabric comprises a hydrophilic fabric 1, an elastic porous fabric 2, and a liquid-locking fabric 3, stacked sequentially along the thickness direction. The thicknesses of the three layers are 0.3 mm, 3 mm, and 0.8 mm, respectively. The hydrophilic fabric 1 is a cotton fiber nonwoven fabric, the elastic porous fabric 2 is a PET fiber nonwoven fabric, and the liquid-locking fabric 3 is a PP fiber nonwoven fabric matrix, which also contains dispersed absorbent polymer (SAP) particles, specifically sodium polyacrylate particles. Figure 2 As shown, when using this absorbent cotton, it can be placed inside the housing 4 of the liquid heating device, located at the bottom of the entire device cavity.

[0071] The preparation method of this absorbent cotton includes the following steps S1 to S4: S1: Preparation of hydrophilic fabric.

[0072] Cotton fibers are web-laid and then hydroentangled to obtain a hydrophilic fabric with a thickness of 0.3 mm, a weight of 75 gsm, and an average pore size of 40 μm.

[0073] S2: Prepare elastic porous fabric.

[0074] PET fibers are laid into a web and then needle-punched for reinforcement to obtain an elastic porous fabric with a thickness of 3 mm, a weight of 680 gsm, and an average pore size of 100 μm.

[0075] S3: Prepare liquid-locking fabric.

[0076] PP fibers are web-laid to obtain PP fiber aggregates; Sodium polyacrylate particles with a particle size of 100 mesh are sprinkled on PP fiber aggregates at a mass ratio of 1.5:1. The mixture is then subjected to hot calendering to obtain a film. The film was needle-punched for reinforcement to obtain a liquid-locking fabric. The liquid-locking fabric contained 60% sodium polyacrylate particles by mass, had a thickness of 0.8 mm, and a matrix weight of 60 gsm.

[0077] S4: Prepare absorbent cotton.

[0078] The hydrophilic fabric, elastic porous fabric, and liquid-locking fabric are stacked sequentially along the thickness direction. The three layers of fabric are then combined using a hot-pressing process. The hot-pressing temperature is 110℃ and the pressure is 50 MPa. Finally, the fabric is die-cut to obtain a circular absorbent cotton with a diameter of 10mm.

[0079] like Figure 2 As shown, the hydrophilic fabric 11, elastic porous fabric 12 and liquid-locking fabric 13 of Example 1 form a liquid-absorbing cotton 1, which is placed at the bottom of the housing 2 cavity of the liquid heating device and can absorb liquid in time.

[0080] Example 2 This embodiment provides an absorbent cotton, the preparation method of which includes the following steps S1 to S4: S1: Preparation of hydrophilic fabric.

[0081] Viscose fibers are web-laid and then hydroentangled to obtain a hydrophilic fabric with a thickness of 0.25 mm and a weight of 45 gsm.

[0082] S2: Prepare elastic porous fabric.

[0083] PE and PP fibers in a 1:1 mass ratio are laid into a web and then needle-punched for reinforcement, resulting in an elastic porous fabric with a thickness of 3.5 mm and a weight of 720 gsm.

[0084] S3: Prepare liquid-locking fabric.

[0085] PP fibers are web-laid to obtain PP fiber aggregates; Sodium polyacrylate particles with a particle size of 100 mesh are sprinkled on PP fiber aggregates at a mass ratio of 1.5:1. The mixture is then subjected to hot calendering to obtain a film. The film was needle-punched for reinforcement to obtain a liquid-locking fabric. The liquid-locking fabric contained 60% sodium polyacrylate particles by mass, had a thickness of 0.8 mm, and a matrix weight of 60 gsm.

[0086] S4: Prepare absorbent cotton.

[0087] The hydrophilic fabric, elastic porous fabric, and liquid-locking fabric are stacked sequentially along the thickness direction. The three layers of fabric are then combined using a hot-pressing process. The hot-pressing temperature is 110℃ and the pressure is 50 MPa. Finally, the fabric is die-cut to obtain a circular absorbent cotton with a diameter of 10mm.

[0088] like Figure 3 As shown, the absorbent cotton 1 of Example 2 is used in a liquid heating device. The liquid heating device includes a suction nozzle 3, a liquid storage component 4, and a power supply and circuit component 5. The absorbent cotton 1 is provided below each of these components to absorb the liquid in a timely manner.

[0089] Example 3 This embodiment provides an absorbent cotton, the preparation method of which includes the following steps S1 to S4: S1: Preparation of hydrophilic fabric.

[0090] Viscose fibers are web-laid and then hydroentangled to obtain a hydrophilic fabric with a thickness of 0.25 mm and a weight of 45 gsm.

[0091] S2: Prepare elastic porous fabric.

[0092] PET fibers are laid into a web and then needle-punched for reinforcement to obtain an elastic porous fabric with a thickness of 3 mm and a weight of 680 gsm.

[0093] S3: Prepare liquid-locking fabric.

[0094] PP fibers are web-laid to obtain PP fiber aggregates; Sodium polyacrylate particles with a particle size of 200 mesh are sprinkled on PE fiber assemblies, with a mass ratio of sodium polyacrylate particles to PE fiber assemblies of 4:1. The film is then subjected to hot calendering. The film was needle-punched for reinforcement to obtain a liquid-locking fabric. The liquid-locking fabric contained 80% sodium polyacrylate particles by mass, had a thickness of 1.2 mm, and a substrate weight of 75 gsm.

[0095] S4: Prepare absorbent cotton.

[0096] The hydrophilic fabric, elastic porous fabric, and liquid-locking fabric are stacked sequentially along the thickness direction. The three layers of fabric are then combined using a hot-pressing process. The hot-pressing temperature is 110℃ and the pressure is 50 MPa. Finally, the fabric is die-cut to obtain a circular absorbent cotton with a diameter of 10mm.

[0097] Example 4 This embodiment provides an absorbent cotton, the preparation method of which includes the following steps S1 to S4: S1: Preparation of hydrophilic fabric.

[0098] Cotton fibers are web-laid and then hydroentangled to obtain a hydrophilic fabric with a thickness of 0.3 mm and a weight of 75 gsm.

[0099] S2: Prepare elastic porous fabric.

[0100] PE and PP fibers in a 1:1 mass ratio are laid into a web and then needle-punched for reinforcement, resulting in an elastic porous fabric with a thickness of 3.5 mm and a weight of 720 gsm.

[0101] S3: Prepare liquid-locking fabric.

[0102] PP fibers are web-laid to obtain PP fiber aggregates; Sodium polyacrylate particles with a particle size of 100 mesh are sprinkled on PP fiber aggregates at a mass ratio of 1.5:1. The mixture is then subjected to hot calendering to obtain a film. The film was needle-punched for reinforcement to obtain a liquid-locking fabric. The liquid-locking fabric contained 60% sodium polyacrylate particles by mass, had a thickness of 0.8 mm, and a matrix weight of 60 gsm.

[0103] S4: Prepare absorbent cotton.

[0104] The hydrophilic fabric, elastic porous fabric, and liquid-locking fabric are stacked sequentially along the thickness direction. The three layers of fabric are then combined using a hot-pressing process. The hot-pressing temperature is 110℃ and the pressure is 50 MPa. Finally, the fabric is die-cut to obtain a circular absorbent cotton with a diameter of 10mm.

[0105] Example 5 This embodiment provides an absorbent cotton, which differs from that of Example 1 only in that sodium polyacrylate particles are replaced with polyvinyl alcohol particles. All other steps are the same.

[0106] Example 6 This embodiment provides an absorbent cotton, which differs from Example 1 only in that sodium polyacrylate particles are replaced with carboxymethyl cellulose particles. All other steps are the same.

[0107] Example 7 This embodiment provides an absorbent cotton, which differs from Embodiment 1 only in that: in step S3, the SAP mass percentage in the liquid-locking fabric is reduced to 40%. All other steps are the same.

[0108] Example 8 This embodiment provides an absorbent cotton, which differs from Embodiment 1 only in that: in step S3, the SAP mass percentage in the liquid-locking fabric is reduced to 20%. All other steps are the same.

[0109] Example 9 This embodiment provides an absorbent cotton, which differs from Embodiment 1 only in that the thickness of the elastic porous fabric is changed to 1.2 mm, and the weight is proportionally reduced to 300 gsm. All other steps are the same.

[0110] Example 10 This embodiment provides an absorbent cotton, which differs from Embodiment 1 only in that the thickness of the elastic porous fabric is changed to 0.6 mm, and the weight is proportionally reduced to 150 gsm. All other steps are the same.

[0111] Example 11 This embodiment provides an absorbent cotton, which differs from Embodiment 1 only in that the hydroentangling and needle-punching processes in steps S1 and S2 are adjusted, increasing the average pore size of the hydrophilic fabric to 60 μm and decreasing the average pore size of the elastic porous fabric to 90 μm. All other steps are the same.

[0112] Example 12 This embodiment provides an absorbent cotton, which differs from Embodiment 1 only in that the hydroentangling and needle-punching processes in steps S1 and S2 are adjusted, increasing the average pore size of the hydrophilic fabric to 80 μm and decreasing the average pore size of the elastic porous fabric to 70 μm. All other steps are the same.

[0113] Comparative Example 1 This comparative example provides an absorbent cotton, which differs from Example 4 only in that it omits the step of preparing the liquid-locking fabric; instead, the hydrophilic fabric and the elastic porous fabric are directly subjected to the hot-pressing treatment in step S4. All other steps are the same.

[0114] Comparative Example 2 This comparative example provides an absorbent cotton, which differs from Example 3 only in that sodium polyacrylate particles are not added in step S3. Instead, PE fibers are made into a base fabric with a thickness of 1.2 mm and a weight of 75 gsm. This base fabric is used instead of the liquid-locking fabric for the heat-pressing treatment in step S4. All other steps are the same.

[0115] Comparative Example 3 This comparative example provides an absorbent cotton, which differs from Example 1 only in that the fiber type in step S2 is changed to cotton fiber. The resulting fabric is also 3 mm thick and has a weight of 680 gsm, but it does not have sufficient resilience. All other steps are the same.

[0116] Comparative Example 4 This comparative example provides an absorbent cotton, which differs from Example 1 only in that the liquid-locking fabric in step S2 is replaced by a dense polyurethane film with a thickness of 0.25 mm and a basis weight of 100 gsm. This dense film is used instead of the liquid-locking fabric for the heat-pressing treatment in step S4. All other steps are the same.

[0117] The differences between Examples 1 to 12 and Comparative Examples 1 to 4 are shown in Table 1.

[0118] In Table 1, the units for thickness are all mm and the units for weight are all gsm.

[0119]

[0120] Relevant performance tests and results analysis.

[0121] 1. Fabric-related parameter testing.

[0122] 1.1 The fabric thickness was tested according to GB / T 24218.2-2009, and the basis weight was tested according to GB / T24218.1-2009. The basis weight of the fabric matrix in the liquid-locking fabric was calculated by first measuring the basis weight of the liquid-locking fabric, and then multiplying it by the mass percentage of fiber in the liquid-locking fabric. This percentage is 100% - the mass percentage of SAP in the liquid-locking fabric, such as 100% - 60% in Example 1, which is 40%.

[0123] 1.2 The porosity and pore size of each fabric were tested by low-temperature nitrogen adsorption method, referring to GB / T 34533-2023.

[0124] 2. Liquid absorption rate and leak-proof performance test.

[0125] The test liquid is a mixture of 1,2-propanediol and glycerol in a mass ratio of 5:5.

[0126] Before testing, the air was equilibrated for 24 hours according to the standard atmosphere for conditioning and testing of textiles in GB / T 6529.

[0127] 2.1 Referring to the standard drop test, 0.1 mL of liquid was dropped from a height of 10 mm onto the center of the absorbent layer of the absorbent cotton. The time required for the liquid to be completely absorbed was recorded. The amount of liquid absorbed per unit time ( / s) is the absorption rate (mL / s). The test results for each case are recorded in Table 1 above. The larger the value, the higher the absorption rate.

[0128] 2.2 Fix the absorbent cotton sample on a test platform at a 45° inclination angle. Continuously add test liquid to the surface of the hydrophilic layer at a rate of 0.05 mL / min. Record the total liquid volume corresponding to the time point when liquid first seeps from the bottom or edge of the liquid-locking fabric. Record the test results for each case in Table 1 above. The larger the value, the better the leak-proof effect.

[0129] 3. Results Analysis.

[0130] In each embodiment, the design of hydrophilic fabric-elastic porous fabric-liquid-locking fabric resulted in better overall liquid absorption rate and leak-proof test results than the comparative example.

[0131] Comparing the data from Examples 1 to 4 in Table 1, it can be seen that the absorbency rate of the absorbent cotton depends on the properties of the hydrophilic fabric, especially parameters such as thickness, basis weight, and porosity. When absorbing a small amount of liquid, the leak-proof fabric has almost no effect on the absorbency rate. Meanwhile, increasing the thickness of the liquid-locking fabric and the amount of SAP can significantly improve the leak-proof performance.

[0132] In Examples 5 and 6, by adjusting the type of SAP, the overall performance of the absorbent cotton is close to that of Example 1. It can be seen that the use of these absorbent resin particles in the liquid-locking fabric is beneficial to the overall absorbent cotton having high liquid-proof performance.

[0133] In Examples 7 and 8, the amount of SAP gradually decreased, and the overall liquid absorption rate of the absorbent cotton remained almost unchanged. At the same time, the anti-leakage performance showed a downward trend. It can be seen that if the SAP content is too low, it may not be able to effectively absorb and lock in the liquid, and the liquid storage capacity will also decrease significantly.

[0134] In Examples 9 and 10, the elastic porous fabric gradually becomes thinner and its basis weight gradually decreases, resulting in a smaller liquid storage space. This causes the liquid to quickly reach the liquid-locking fabric, increasing the burden on the SAP layer. However, due to the high amount of SAP used, the overall leak-proof test results are only slightly lower than in Example 1. However, during the compression test, because the elastic porous fabric in these two cases is thinner, its resilience and cushioning performance are significantly weakened. Under external pressure, the liquid is more likely to break through the liquid-locking layer and leak.

[0135] In Examples 11 and 12, the pore size of the hydrophilic fabric gradually increases while the pore size of the elastic fabric gradually decreases. The liquid absorption rate and leak-proof test results are still relatively ideal. However, the liquid conduction efficiency from the hydrophilic fabric to the elastic porous fabric decreases. During the droplet test, the elastic porous fabric has difficulty absorbing and conducting liquid in time, resulting in a small amount of liquid overflowing from the surface of the hydrophilic layer.

[0136] Compared to Example 4, Comparative Example 1 lacked a liquid-locking fabric. Therefore, although the absorbent cotton had a higher absorption rate, it failed the leak-proof test, and the liquid quickly leaked from the elastic porous fabric.

[0137] Compared to Example 3, Comparative Example 2 lacks SAP in its liquid-locking fabric, resulting in a significant reduction in leak-proof performance. Furthermore, because the parameters of its hydrophilic and elastic porous fabrics are inferior to those of Comparative Example 1, and Example 4 is inferior to Example 3, meaning that both the hydrophilic and elastic porous fabrics themselves have a slight liquid-retaining effect, the materials used in these two layers also have a minor impact on the leak-proof test results. Therefore, although Comparative Example 2 has a fabric substrate, its overall leak-proof performance is inferior to that of Comparative Example 1.

[0138] Comparative Example 3 lacks an elastic porous fabric, and the middle layer is made of cotton fibers. This results in the middle layer lacking sufficient liquid storage capacity, and the overall leak-proof effect is not as good as Example 1. More importantly, during a compression test, the absorbent cotton collapsed under external pressure. Liquid not only easily breaks through the liquid-locking layer but also quickly leaks directly from the liquid-absorbing fabric and the middle cotton fabric. Therefore, it cannot maintain structural stability, and the problems of existing technologies will still exist in practical applications, posing certain risks.

[0139] Comparative Example 4 did not use a liquid-locking fabric, but instead used a dense film commonly used in the prior art. The liquid absorption rate was not much different from that of Example 1, but it resulted in the entire absorbent cotton lacking sufficient liquid storage and locking capacity, and the anti-leakage effect was significantly lower than that of Example 1.

[0140] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A liquid-absorbing cotton, characterized in that: It includes hydrophilic fabric, elastic porous fabric and liquid-locking fabric stacked sequentially along the thickness direction; The liquid-locking fabric includes a fabric matrix and liquid-absorbing resin particles dispersed in the fabric matrix.

2. The absorbent cotton according to claim 1, characterized in that, The liquid-absorbing resin particles satisfy at least one of the following characteristics: (1) The absorbent resin particles contain at least one of polyacrylate, polyvinyl alcohol, polyacrylamide, carboxymethyl cellulose, polyurethane, and chitosan; (2) The particle size of the absorbent resin particles is 75 μm to 150 μm; (3) The liquid-absorbing resin particles in the liquid-locking fabric have a mass percentage content of 20% to 60%; (4) The weight-average molecular weight of the absorbent resin particles is 500,000 to 5,000,000.

3. The absorbent cotton according to claim 1 or 2, characterized in that, The liquid-locking fabric satisfies at least one of the following characteristics: (1) The absorbent resin particles fill the pores of the fabric matrix, and the fabric matrix contains fibers, and at least a portion of the fibers penetrate the absorbent resin particles; (2) The porosity of the fabric matrix is ​​75% to 95%; (3) The pore size of the fabric matrix is ​​30 μm to 80 μm; (4) The thickness of the fabric substrate is 0.5 mm to 2 mm, and the basis weight is 25 gsm to 200 gsm; (5) The fabric matrix contains at least one of polyester fiber, polyethylene fiber, and polypropylene fiber; (6) The fabric matrix includes nonwoven fabric.

4. The absorbent cotton according to claim 1 or 2, characterized in that, The elastic porous fabric satisfies at least one of the following characteristics: (1) The elastic deformation recovery rate of the elastic porous fabric is ≥95%; (2) The porosity of the elastic porous fabric is ≥90%; (3) The pore size of the elastic porous fabric is 70 μm to 120 μm; (4) The elastic porous fabric contains at least one of polyethylene terephthalate fiber, polyethylene fiber, polypropylene fiber, polyamide fiber, and polylactic acid fiber; (5) The thickness of the elastic porous fabric is 0.5 mm to 9 mm, and the basis weight is 100 gsm to 1500 gsm; (6) The elastic porous fabric includes nonwoven fabric; (7) The pore size of the elastic porous fabric is larger than that of the hydrophilic fabric.

5. The absorbent cotton according to claim 1 or 2, characterized in that, Fiber entanglements are formed between the hydrophilic fabric and the elastic porous fabric, and between the elastic porous fabric and the liquid-locking fabric; and / or, The hydrophilic fabric satisfies at least one of the following characteristics: (1) The contact angle of the hydrophilic fabric is 0° to 30°; (2) The hydrophilic fabric contains at least one of natural fibers and regenerated fibers; (3) The thickness of the hydrophilic fabric is 0.1 mm to 0.8 mm, and the basis weight is 15 gsm to 100 gsm; (4) The hydrophilic fabric includes nonwoven fabric; (5) The porosity of the hydrophilic fabric is 80%–95%; (6) The pore size of the hydrophilic fabric is 20 μm to 80 μm.

6. A method for preparing absorbent cotton, characterized in that, Includes the following steps: Liquid-absorbing resin particles are dispersed in the fabric matrix to obtain liquid-locking fabric; The absorbent cotton is obtained by layering the hydrophilic fabric, the elastic porous fabric, and the liquid-locking fabric in sequence along the thickness direction.

7. The preparation method according to claim 6, characterized in that, The process of dispersing the liquid-absorbing resin particles in the fabric matrix includes the following steps: The fiber raw material of the fabric matrix is ​​subjected to web-laying treatment to obtain a fiber aggregate; The liquid-absorbing resin particles are dispersed in the fiber aggregate and subjected to hot calendering to obtain a composite film. The composite membrane is reinforced so that the fiber materials become entangled with each other, and at least a portion of the fiber materials penetrate into the absorbent resin particles.

8. The preparation method according to claim 7, characterized in that, The hot rolling treatment temperature is 100℃~120℃; and / or, The pressure of the hot rolling process is 0.5 MPa to 1 MPa; and / or, The reinforcement treatment includes needle puncture treatment.

9. The preparation method according to claim 6 or 7, characterized in that: The absorbent resin particles contain at least one of polyacrylate, polyvinyl alcohol, polyacrylamide, carboxymethyl cellulose, polyurethane, and chitosan; and / or, The absorbent resin particles have a particle size of 75 μm to 150 μm; and / or, The mass ratio of the absorbent resin particles to the fabric matrix is ​​(0.25–1.5):1; and / or, The fiber raw material of the fabric matrix includes at least one of polyester fiber, polyethylene fiber, and polypropylene fiber.

10. The preparation method according to claim 6 or 7, characterized in that: The elastic porous fabric is made from at least one of polyethylene terephthalate fiber, polyethylene fiber, polypropylene fiber, polyamide fiber, and polylactic acid fiber; and / or, The elastic porous fabric is made by needle-punching fibers; and / or The raw materials for the hydrophilic fabric include at least one of natural fibers and regenerated fibers; and / or, The hydrophilic fabric is made from fibers that have undergone hydroentangling; and / or After the layering is completed, the process further includes a step of hot-pressing the layered hydrophilic fabric, elastic porous fabric, and liquid-locking fabric along the thickness direction.

11. A liquid heating device, characterized in that: It includes absorbent cotton as described in any one of claims 1 to 5, or absorbent cotton prepared by the preparation method described in any one of claims 6 to 10.

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