Liquid storage part, preparation method thereof and atomization device

Abstract

The invention discloses a liquid storage part, a preparation method thereof and an atomization device, and relates to the field of atomization devices. The liquid storage part comprises a fiber matrix and phase change microcapsules dispersed in the fiber matrix, and the thermal deformation temperature of the phase change microcapsules ranges from 120 DEG C to 160 DEG C. The phase change microcapsules achieve heat buffering by absorbing or releasing heat, so that the liquid storage part has good heat stability and is not prone to being decomposed to generate harmful gas such as formaldehyde and acrolein, the stability requirement under the long-time high-temperature working condition can be met, and the problem that an existing liquid storage part is poor in high-temperature resistance can be solved.

Description

Technical Field

[0001] This application relates to the field of atomizing devices, and more particularly to a liquid storage device, a method for preparing the same, and an atomizing device. Background Technology

[0002] The reservoir is a crucial component of an atomizing device, its main function being to store e-liquid and deliver it to the conductive wire, where it is heated to atomize the e-liquid. During operation, the reservoir needs to operate at a relatively high temperature. However, under high temperatures, existing reservoirs are prone to decomposition, producing harmful gases that not only affect the flavor of the atomized product but may also pose potential health hazards to the user.

[0003] Currently, existing liquid storage components have poor high-temperature resistance, making it difficult to meet the stability requirements under long-term high-temperature conditions.

[0004] In view of this, it is necessary to provide a liquid storage component, a method for preparing the same, and an atomizing device to solve the above problems. Summary of the Invention

[0005] The purpose of this application is to provide a liquid storage component, a method for preparing the same, and an atomizing device to solve the above-mentioned problems.

[0006] To achieve the above objectives, this application adopts the following technical solution: A liquid storage device includes a fiber matrix and phase change microcapsules dispersed in the fiber matrix, wherein the thermal deformation temperature of the phase change microcapsules is 120°C to 160°C.

[0007] In some embodiments, the liquid reservoir further includes antimicrobial particles dispersed in the fiber matrix, the antimicrobial particles being used to destroy or inhibit microorganisms.

[0008] In some embodiments, the antibacterial particles comprise chitosan and silver nanoparticles loaded on the chitosan.

[0009] In some embodiments, the liquid reservoir further includes a hydrophobic coating for reducing the surface free energy of the liquid reservoir to inhibit liquid from precipitating out of the liquid reservoir when not in operation.

[0010] In some embodiments, the hydrophobic coating comprises polydimethylsiloxane; and / or, The thickness of the hydrophobic coating is 2μm~3μm.

[0011] In some embodiments, the fiber matrix is ​​prepared by oxidative modification of microcrystalline cellulose; and / or, The fiber matrix is ​​a biodegradable matrix; and / or, The phase change microcapsule comprises a phase change material core and a polymer shell encapsulating the phase change material core, wherein the phase change material core is paraffin wax and the polymer shell is urea-formaldehyde resin; and / or, The molding process of the liquid storage component includes freeze-drying molding; and / or, The liquid storage component comprises 4-6 parts by weight of antibacterial particles, 4-6 parts by weight of hydrophobic coating, 65-75 parts by weight of fiber matrix, and 12-18 parts by weight of phase change microcapsules.

[0012] This application also provides a method for preparing a liquid storage device, used to prepare the liquid storage device as described above, the method comprising: Obtain a slurry to be formed, wherein the slurry to be formed comprises a fiber matrix and phase change microcapsules; The slurry to be formed is injected into a mold and freeze-dried to obtain the liquid storage component.

[0013] In some embodiments, after the freeze-drying process, the preparation method further includes: The freeze-dried structure is impregnated with a polymer solution, then spin-coated and cured to obtain the liquid storage component.

[0014] In some embodiments, the preparation method further satisfies at least one of the following conditions: (I) The slurry to be formed further includes antibacterial particles, which include chitosan and silver nanoparticles loaded on the chitosan; (II) The fiber matrix is ​​prepared by oxidative modification of microcrystalline cellulose; (III) The phase change microcapsule comprises a phase change material core and a polymer shell encapsulating the phase change material core, wherein the phase change material core is paraffin wax and the polymer shell is urea-formaldehyde resin; (IV) The freeze-drying temperature is -150℃ to -120℃, and the freeze-drying time is 4h to 6h; (V) The polymer solution is an organic solution of polydimethylsiloxane, and the mass fraction of the polymer solution is 5%~8%; The rotational speed of the spin coating is 3000 rpm to 3500 rpm, and the spin coating time is 20 s to 30 s; The curing temperature is 120℃~132℃, and the curing time is 2h~2.5h.

[0015] This application also provides an atomizing device, which includes the liquid storage element described above.

[0016] Compared with the prior art, the beneficial effects of this application include: This application introduces phase change microcapsules into the liquid storage device. The thermal deformation temperature of the phase change microcapsules is 120℃~160℃, while the heating and atomization temperature of electronic atomization devices is usually above 200℃. By absorbing or releasing heat through the phase change microcapsules, thermal buffering is achieved, which improves the high temperature resistance of the liquid storage device and gives it better thermal stability. It is not easy to decompose and produce harmful gases such as formaldehyde and acrolein, which can meet the stability requirements under long-term high temperature conditions and solve the problem of poor high temperature resistance of existing liquid storage devices.

[0017] The preparation method of the liquid storage device in this application has the advantages of simple process and low production cost, which is conducive to large-scale industrial production. Detailed Implementation

[0018] As used in this article: "Prepared from" is synonymous with "comprising". The terms "comprising", "including", "having", "containing", or any other variations thereof as used herein are intended to cover non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that includes the listed elements is not necessarily limited to those elements, but may include other elements not expressly listed or elements inherent to such composition, step, method, article, or apparatus.

[0019] The conjunction "composed of..." excludes any unspecified elements, steps, or components. If used in a claim, this phrase makes the claim closed, excluding materials other than those described, except for associated conventional impurities. When the phrase "composed of..." appears in a clause of the body of a claim rather than immediately following it, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0020] When a quantity, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pair of any upper or preferred value with any lower or preferred value, regardless of whether the range is disclosed individually. For example, when the range “1–5” is disclosed, the described range should be interpreted as including ranges “1–4”, “1–3”, “1–2”, “1–2 and 4–5”, “1–3 and 5”, etc. When numerical ranges are described herein, unless otherwise stated, the range is intended to include its endpoints and all integers and fractions within that range.

[0021] In these embodiments, unless otherwise specified, the portions and percentages are all by weight.

[0022] "Parts by mass" refers to the basic unit of measurement that expresses the mass ratio of multiple components. One part can represent any unit mass, such as 1g or 2.689g. If we say that component A has "a" parts by mass and component B has "b" parts by mass, it means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, it can mean that the mass of component A is aK and the mass of component B is bK (where K is any number representing a multiplier). It is important to understand that, unlike parts by mass, the sum of the mass parts of all components is not limited to 100 parts.

[0023] "And / or" is used to indicate that one or both of the described situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0024] A liquid storage device includes a fiber matrix and phase change microcapsules dispersed in the fiber matrix, wherein the thermal deformation temperature of the phase change microcapsules is 120°C to 160°C.

[0025] This application introduces phase change microcapsules with a thermal deformation temperature of 120℃~160℃ into the liquid storage component, enabling the component to possess significant thermal buffering capacity under the high-temperature operating environment of the electronic atomization device. When the heating temperature of the electronic atomization device exceeds 200℃, the phase change microcapsules can achieve thermal buffering by absorbing or releasing heat, effectively improving the high-temperature resistance and thermal stability of the liquid storage component. The liquid storage component of this application exhibits high safety and stability under prolonged high-temperature conditions, and is less prone to decomposition to produce harmful gases such as formaldehyde and acrolein, thus meeting the usage requirements of long-life atomization products.

[0026] It should be noted that the liquid reservoir refers to the oil-retaining cotton used in electronic atomization devices. The thermal deformation temperature of phase change microcapsules refers to the initial temperature at which their shape changes when the external temperature changes.

[0027] In some embodiments, the reservoir further includes antibacterial particles dispersed in the fiber matrix, which are used to destroy or inhibit microorganisms. Experiments show that the reservoir incorporating antibacterial particles achieves a kill rate of >99.99% against E. coli, demonstrating excellent antibacterial performance. Furthermore, the introduction of antibacterial particles can inhibit carbon buildup, extend device lifespan, and stabilize atomization performance. Simultaneously, this design avoids off-flavors and harmful substances caused by microbial growth, helping to maintain the purity of the atomized flavor and ensuring the chemical stability of the e-liquid.

[0028] In some embodiments, the antibacterial particles comprise chitosan and silver nanoparticles loaded on the chitosan. Chitosan serves as a carrier for loading the silver nanoparticles, and its own antibacterial properties enhance the antibacterial effect. The silver nanoparticles possess antibacterial properties, achieving highly efficient and broad-spectrum killing of bacteria, fungi, and the like. This composite structure inhibits the growth and contamination of microorganisms during e-liquid storage, ensuring the e-liquid remains healthy and sterile during storage, maintaining food-grade safety standards, and providing users with a clean atomization experience.

[0029] In some embodiments, the method for preparing antibacterial particles includes: mixing silver nitrate solution and chitosan solution, and carrying out a reduction reaction under ultrasonic conditions to form a dispersion containing a nano-silver-chitosan complex; and subjecting the dispersion to solid-liquid separation, drying and pulverizing to obtain antibacterial particles.

[0030] In some embodiments, the chitosan solution has a mass fraction of 1%-3% (e.g., 1%, 2%, 3%), the volume ratio of the chitosan solution to the silver nitrate solution is 5:1-2, the concentration of the silver nitrate solution is 0.05-0.15 mol / L (e.g., 0.05 mol / L, 0.1 mol / L, 0.15 mol / L); the ultrasonic power is 200-400 W (e.g., 200 W, 300 W, 400 W), the frequency is 30-50 kHz (e.g., 30 kHz, 40 kHz, 50 kHz), the reduction reaction temperature is 25-35℃ (e.g., 25℃, 30℃, 35℃), and the reduction reaction time is 30-45 minutes.

[0031] In some embodiments, the liquid reservoir further includes a hydrophobic coating for reducing the surface free energy of the liquid reservoir to inhibit liquid precipitation from the liquid reservoir in a non-operating state. This hydrophobic coating is located on the surface of a material formed from a fiber matrix, phase change microcapsules, and antibacterial particles.

[0032] In some embodiments, the hydrophobic coating comprises polydimethylsiloxane. The introduction of this hydrophobic coating enhances the affinity of the reservoir for e-liquid, helping to reduce the risk of leakage; moreover, the hydrophobic coating can also prevent moisture from the external environment from penetrating the interior of the reservoir, thus providing a moisture-proof function.

[0033] In some embodiments, the thickness of the hydrophobic coating is 2 μm to 3 μm. If the thickness of the hydrophobic coating is too small, the reservoir will easily absorb water, diluting the e-liquid. If the thickness of the hydrophobic coating is too large, it will prevent the condensate from flowing back, affecting the uniformity of the e-liquid.

[0034] For example, the thickness of the hydrophobic coating can be 2μm, 2.1μm, 2.2μm, 2.3μm, 2.4μm, 2.5μm, 2.6μm, 2.7μm, 2.8μm, 2.9μm, 3μm, or any value between 2μm and 3μm.

[0035] In some embodiments, the fiber matrix is ​​prepared by oxidative modification of microcrystalline cellulose; further, the oxidative modification is carried out using a catalytic oxidation system comprising TEMPO, NaBr and NaClO.

[0036] In some embodiments, the method for preparing the fiber matrix includes: mixing microcrystalline cellulose with water to obtain a suspension; adding TEMPO and NaBr to the suspension to maintain the pH of the system at 9.0. 9.5. Add NaClO solution dropwise to the system to carry out the oxidation reaction; after the reaction is completed, add ethanol to terminate the reaction, and obtain the fiber matrix by centrifugation, washing and drying.

[0037] In some embodiments, the amount of TEMPO added is 0.5%-1.5% (e.g., 0.5%, 1%, 1.5%) of the mass of microcrystalline cellulose, and the amount of sodium bromide added is 8% of the mass of TEMPO. 12 times (e.g., 8 times, 10 times, 12 times). The oxidation reaction is carried out at room temperature, and the oxidation reaction time is 1... 3 hours (e.g., 1 hour, 2 hours or 3 hours).

[0038] This application constructs a porous network of e-liquid storage framework by introducing a fiber matrix into the liquid storage component. This fiber matrix has excellent affinity for e-liquid, enabling rapid adsorption and locking of e-liquid. Moreover, the porous structure formed by the interwoven fiber matrix facilitates balanced e-liquid supply, ensuring consistent atomization volume. Furthermore, this porous structure can also trap impurities and large particles in the e-liquid, thus improving the cleanliness of the atomization process.

[0039] In some embodiments, the fiber matrix is ​​a biodegradable matrix. This reduces pollution from consumables used in electronic atomization devices.

[0040] In some embodiments, the phase change microcapsule includes a phase change material core and a polymer shell encapsulating the phase change material core. The phase change material core is paraffin wax, and the polymer shell is urea-formaldehyde resin. This structure of the phase change microcapsule can effectively improve the high-temperature resistance and thermal stability of the liquid storage device. The phase change material core achieves the storage and release of latent heat through a solid-liquid / liquid-solid reversible phase change, while the polymer shell provides support and barrier functions. Specifically, it includes the following processes: 1. Heat absorption buffering stage: When the ambient temperature rises to the phase change temperature of the core material, the core material absorbs heat from the environment and undergoes a phase change (such as melting from a solid to a liquid). During this process, the temperature remains basically constant, thereby reducing the rate of increase of the ambient temperature and achieving a heat absorption and cooling effect. In this stage, the polymer shell plays a role in fixing the shape of the core material and preventing leakage of the liquid core material. 2. Heat storage stage: After the phase change is completed, if the ambient temperature continues to rise, the liquid core material will store a small amount of heat in the form of sensible heat. At the same time, the polymer shell can also store some heat through thermal conduction, further enhancing the duration of heat buffering. 3. Exothermic Buffering Stage: When the ambient temperature drops below the phase change temperature of the core material, the liquid core material releases the stored latent heat of phase change, undergoing a reverse phase change (such as solidification from liquid to solid). This process also maintains temperature stability, slowing down the rate of temperature decrease and achieving an exothermic and heat-insulating thermal buffering effect. 4. Cyclic Stability: The dense polymer shell can block the exchange of substances between the core material and the external environment, preventing the core material from volatilizing, oxidizing, or reacting with the matrix material, ensuring that the phase change microcapsules maintain stable thermal buffering performance after multiple thermal cycles.

[0041] The preparation method of phase change microcapsules includes: dissolving urea in water and adjusting the pH to 8.5. 9.0, add formaldehyde solution, and react at 65-75℃ (e.g., 65℃, 70℃, 75℃) for 1.5. After 2 hours, hydroxymethyl urea prepolymer was obtained; polyvinyl alcohol and alkylphenol polyoxyethylene ether were dissolved in water and heated to 75-85℃ (e.g., 75℃, 80℃, 85℃) to dissolve them; molten paraffin was added, and emulsification was carried out under stirring for 15 hours. A paraffin emulsion was prepared in 25 minutes, wherein the phase transition temperature of the paraffin was 42°C. 44℃; mix the hydroxymethylurea prepolymer with the paraffin emulsion, and adjust the pH to 3.5. 4.0, polymerized at 55-65℃ (e.g., 55℃, 60℃, 65℃) 2 After 3 hours, the temperature is raised to 70-80℃ (e.g., 70℃, 75℃, 80℃) and cured for 0.5-1.5 hours (e.g., 0.5 hours, 1 hour, 1.5 hours); the resulting reaction product is then filtered, washed, and dried sequentially to obtain phase change microcapsules.

[0042] In some embodiments, the mass ratio of urea to formaldehyde solution is 1:2.3. 2.9 (e.g., 1:2.3, 1:2.6, 1:2.9), wherein the formaldehyde solution has a mass fraction of 35%. 39% (e.g., 35%, 37%, 39%). The mass ratio of the paraffin wax to polyvinyl alcohol and alkylphenol polyoxyethylene ether is 20:(0.8-1.2):(0.3-0.8) (e.g., 20:0.8:0.3, 20:1:0.5, 20:1.2:0.8). The mass ratio of the urea to the paraffin wax is 1:1.5-2.5 (e.g., 1:1.5, 1:2, 1:2.5).

[0043] In some embodiments, the phase change microcapsules have a particle size of 10-50 μm. This particle size range is beneficial for improving the uniformity of phase change microcapsules in the liquid storage device, and can also form a uniform encapsulation structure with the fiber matrix, which is beneficial for improving the stability of the liquid storage device.

[0044] In some embodiments, the molding process of the liquid storage component includes freeze-drying molding.

[0045] In some embodiments, the liquid reservoir comprises 4-6 parts by weight of antibacterial particles, 4-6 parts by weight of a hydrophobic coating, 65-75 parts by weight of a fiber matrix, and 12-18 parts by weight of phase change microcapsules.

[0046] For example, the content of antibacterial particles in the liquid reservoir is any value between 4, 5, 6, or 4-6 parts by mass; the content of hydrophobic coating in the liquid reservoir is any value between 4, 5, 6, or 4-6 parts by mass; the content of fiber matrix in the liquid reservoir is any value between 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, or 65-75 parts by mass; and the content of phase change microcapsules in the liquid reservoir is any value between 12, 13, 14, 15, 16, 17, 18, or 12-18 parts by mass.

[0047] In some embodiments, the pore size of the liquid storage device is 20-50 μm, and the liquid storage device has a connected directional channel structure inside, which is conducive to forming a complete oil storage network.

[0048] This application also provides a method for preparing a liquid storage component, which is used to prepare the liquid storage component as described above. The preparation method includes: obtaining a slurry to be formed, the slurry to be formed including a fiber matrix and phase change microcapsules; injecting the slurry to be formed into a mold and freeze-drying to obtain the liquid storage component.

[0049] In some embodiments, after the freeze-drying molding, the preparation method further includes: impregnating the freeze-dried structure with a polymer solution, then spin-coating, and finally curing to obtain the liquid storage component. Through impregnation, spin-coating, and curing, a hydrophobic coating can be formed on the oriented channel walls.

[0050] In some embodiments, the slurry to be formed further includes antibacterial particles, the antibacterial particles comprising chitosan and silver nanoparticles loaded on the chitosan.

[0051] In some embodiments, the fiber matrix is ​​prepared by oxidative modification of microcrystalline cellulose.

[0052] In some embodiments, the phase change microcapsule includes a phase change material core and a polymer shell encapsulating the phase change material core, wherein the phase change material core is paraffin wax and the polymer shell is urea-formaldehyde resin.

[0053] In some embodiments, the freeze-drying temperature is -150°C to -120°C, and the freeze-drying time is 4 hours to 6 hours. Freeze-drying can form a connected, directional channel structure inside the liquid storage component. For example, the freeze-drying temperature can be any value between -150°C, -140°C, -130°C, -120°C, or -150°C to -120°C; the freeze-drying time can be any value between 4 hours, 5 hours, 6 hours, or 4 hours to 6 hours.

[0054] In some embodiments, the polymer solution is an organic solution of polydimethylsiloxane, and the mass fraction of the polymer solution is 5% to 8%; for example, the mass fraction of the polymer solution is any value between 5%, 6%, 7%, 8%, or 5% to 8%.

[0055] In some embodiments, the rotational speed of the spin coating is 3000 rpm to 3500 rpm, and the spin coating time is 20 s to 30 s; for example, the rotational speed of the spin coating is any value between 3000 rpm, 3100 rpm, 3200 rpm, 3300 rpm, 3400 rpm, 3500 rpm, or 3000 rpm, and the spin coating time is any value between 20 s, 21 s, 22 s, 23 s, 24 s, 25 s, 26 s, 27 s, 28 s, 29 s, 30 s, or 20 s to 30 s.

[0056] In some embodiments, the curing temperature is 120℃~132℃, and the curing time is 2h~2.5h. For example, the curing temperature is 120℃, 122℃, 125℃, 127℃, 130℃, 132℃, or any value between 120℃ and 132℃, and the curing time is 2h, 2.1h, 2.2h, 2.3h, 2.4h, 2.5h, or any value between 2h and 2.5h.

[0057] This application also provides an atomizing device, which includes the liquid storage element described above.

[0058] The implementation schemes of this application will be described in detail below with reference to specific embodiments. However, those skilled in the art will understand that the following embodiments are only for illustrating this application and should not be regarded as limiting the scope of this application. Unless otherwise specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments used without specified manufacturers are all conventional products that can be purchased commercially.

[0059] Methods for preparing fiber matrices include: Raw material: 1g of microcrystalline cellulose (pre-crushed and passed through an 80-mesh sieve to remove impurities); Catalyst: TEMPO 0.01g; Co-catalyst: NaBr 0.1g; Main oxidizing agent: 6 mL of NaClO solution (5% available chlorine content); Adjusting reagent: 0.5 mol / L HCl solution (for pH adjustment); Solvent: 100 mL of deionized water.

[0060] 1. Detailed operating procedures (room temperature and atmospheric pressure) 1.1. Pretreatment: Add 1g of microcrystalline cellulose to 100mL of deionized water and stir at room temperature for 30 minutes to fully disperse the cellulose and avoid agglomeration that would affect the uniformity of oxidation.

[0061] 1.2. System setup: Add 0.01g TEMPO and 0.1g NaBr to the suspension, and continue stirring for 10 minutes until the reagents are completely dissolved and the system is transparent and pale yellow.

[0062] 1.3. Oxidation start-up and pH control: Slowly add 5% NaClO solution, and continuously adjust the pH of the system to 9.0-9.5 with 0.5mol / L HCl during the addition process (monitor in real time with a pH meter; the reaction will stop if the pH is below 8, and it will cause cellulose degradation if the pH is above 10; stir throughout the process).

[0063] 1.4. Constant temperature reaction: After the addition is complete, keep the reaction at room temperature (around 25°C) and stir for 2 hours. During the reaction, the system will gradually become turbid and the cellulose particles will gradually become finer.

[0064] 1.5. Termination of reaction: When the reaction time is up, add 1 mL of anhydrous ethanol and stir for 5 minutes to terminate the oxidation reaction (ethanol can reduce excess NaClO).

[0065] 1.6. Purification and washing: Centrifuge the reaction solution (8000 r / min, 10 minutes) and collect the precipitate; wash the precipitate repeatedly with deionized water, centrifuging after each wash until the pH of the washing solution is neutral (about 3-4 washes) to remove residual TEMPO, NaBr and NaCl.

[0066] 1.7. Post-processing of the product: The neutral precipitate was freeze-dried (-50℃, 24 hours) to obtain a white, fluffy fiber matrix powder.

[0067] Methods for preparing antibacterial granules include: 1. Preparation of chitosan solution: Weigh 2g of chitosan powder into a three-necked flask, add 98mL of deionized water, add glacial acetic acid dropwise, stir magnetically (300rpm) and heat to 50℃, continue stirring for 2h until the chitosan is completely dissolved, and obtain a clear and transparent 2wt% chitosan acetic acid solution. After cooling to room temperature, filter with a 0.45μm filter membrane to remove undissolved impurities, and set aside for later use.

[0068] 2. Ultrasonic-assisted in-situ reduction preparation of AgNPs@CS complex: The above chitosan solution was transferred to an ultrasonic reactor and magnetic stirring was turned on (200 rpm). 0.1 mol / L silver nitrate solution was slowly added dropwise at a volume ratio of chitosan solution: silver nitrate solution = 5:1-2, with the dropping rate controlled at 1 mL / min. The solution was kept uniformly mixed during the dropping process.

[0069] After the addition was complete, the ultrasonic parameters were set as follows: power 300W, frequency 40kHz, temperature 30℃. The ultrasonic reaction lasted for 30-45 minutes. During the reaction, the solution gradually changed from colorless to light yellow and finally to light brown, indicating that the silver nanoparticles were generated in situ and loaded onto the chitosan.

[0070] 3. Centrifugation and washing of the complex: Transfer the reaction mixture to a centrifuge tube and centrifuge at 8000 rpm for 15 min. Discard the supernatant (containing unreacted silver nitrate and acetic acid). Add 20 mL of anhydrous ethanol to the precipitate and vortex for 3 min to redisperse the precipitate. Centrifuge again at 8000 rpm for 10 min. Repeat the washing with deionized water once and anhydrous ethanol twice until the conductivity of the supernatant is ≤5 μS / cm to ensure complete removal of impurities.

[0071] 4. Freeze-drying and grinding into powder: Spread the washed precipitate evenly on a freeze-drying tray, controlling the thickness to 3-5 mm, and place it in a freeze dryer; set the freeze-drying parameters: first, pre-freeze at -50℃ for 4 hours to ensure the precipitate is completely frozen; then adjust the sublimation pressure to 0.1 mbar and sublimate for 24 hours; finally, raise the temperature to 25℃ for desorption and drying for 4 hours to obtain loose AgNPs@CS solid. Transfer the solid to an agate mortar and grind for 5-10 minutes, then pass it through a 200-mesh standard sieve to obtain antibacterial particles with uniform particle size. Methods for preparing phase change microcapsules include: 1. Preparation of urea-formaldehyde prepolymer: Add 10 parts by mass of urea and 40 parts by mass of deionized water to a three-necked flask, stir to dissolve, and then add 10 wt% sodium hydroxide solution to adjust the pH of the system to 8.5-9.0; heat to 70℃, and add 25.7 parts by mass of formaldehyde solution (37 wt% by mass) dropwise at a uniform rate. Keep warm and stir for 1.5-2 hours to obtain a transparent and viscous hydroxymethylurea prepolymer, and cool to 40℃ for later use.

[0072] 2. Emulsification of paraffin emulsion: Add 80 parts by weight of deionized water, 1.0 parts by weight of polyvinyl alcohol (PVA1788), and 0.5 parts by weight of alkylphenol polyoxyethylene ether (OP-10) to another container, heat to 80°C and stir until completely dissolved; add molten paraffin at 60°C (the phase transition temperature of paraffin is 42-44°C), and add 20 parts by weight of paraffin. Turn on a high-speed shearing machine and shear at 3000-5000 rpm for 15 minutes to obtain a stable paraffin emulsion with a particle size of 10-50 μm, and cool to 40°C.

[0073] 3. Interface polymerization and curing: Slowly pour the urea-formaldehyde prepolymer into the paraffin emulsion and stir at room temperature for 10 minutes to ensure uniform mixing; add 20wt% ammonium chloride solution to adjust the pH to 3.5-4.0, heat to 60℃ and maintain the temperature for 2-3 hours for polymerization; during this period, add 0.5 parts by weight of 1-octanol to defoam, and then heat to 75℃ for curing for 1 hour to complete the cross-linking and molding of the capsule wall.

[0074] 4. Post-processing purification: The reaction system was cooled to room temperature, and the solid product was separated by vacuum filtration. The product was washed three times alternately with deionized water and anhydrous ethanol to remove unreacted monomers and emulsifiers. The washed product was dried in a vacuum drying oven at 45°C for 8 hours to obtain white powdery phase change microcapsules. The phase change microcapsules have a D50 of 25 μm and a thermal deformation temperature of 120℃~160℃.

[0075] Example 1 Example 1 provides a liquid storage device, which includes a fiber matrix and phase change microcapsules and antibacterial particles dispersed in the fiber matrix. The liquid storage device also includes a hydrophobic coating, which is located on the surface of the material formed by the fiber matrix, phase change microcapsules, and antibacterial particles. The hydrophobic coating is made of polydimethylsiloxane and has a thickness of 2 μm. The liquid storage device includes 5 parts by weight of antibacterial particles, 5 parts by weight of hydrophobic coating, 70 parts by weight of fiber matrix, and 15 parts by weight of phase change microcapsules.

[0076] The preparation methods for liquid storage devices include: Mix 70 parts by weight of fiber matrix, 15 parts by weight of phase change microcapsules, 5 parts by weight of antibacterial particles and an appropriate amount of water to obtain the slurry to be formed.

[0077] The slurry to be formed is injected into the mold and freeze-dried at -135℃ for 5 hours. The freeze-dried structure is then impregnated with a toluene solution of polydimethylsiloxane with a mass fraction of 6.5%. The structure is then spin-coated at 3250 rpm for 25 seconds and cured at 126℃ for 2.25 hours to obtain the liquid storage part.

[0078] Comparative Example 1 The liquid storage device was prepared according to the method of Example 1, except that the content of phase change microcapsules was 10 parts by mass. Everything else was the same as in Example 1.

[0079] Comparative Example 2 The liquid storage device was prepared according to the method of Example 1, except that the content of phase change microcapsules was 20 parts by mass. Everything else was the same as in Example 1.

[0080] Comparative Example 3 The liquid storage device was prepared according to the method of Example 1, except that the content of the fiber matrix was 60 parts by weight. Everything else was the same as in Example 1.

[0081] Comparative Example 4 The liquid storage device was prepared according to the method of Example 1, except that the content of the fiber matrix was 80 parts by mass. Everything else was the same as in Example 1.

[0082] Comparative Example 5 The liquid storage device was prepared according to the method of Example 1, except that the content of antibacterial particles was 3 parts by mass. Everything else was the same as in Example 1.

[0083] Comparative Example 6 The liquid storage device was prepared according to the method of Example 1, except that the content of antibacterial particles was 7 parts by weight. Everything else was the same as in Example 1.

[0084] Comparative Example 7 The liquid storage device was prepared according to the method of Example 1, except that the content of phase change microcapsules in the liquid storage device was 2 parts by mass. Everything else was the same as in Example 1.

[0085] Comparative Example 8 The liquid storage device was prepared according to the method of Example 1, except that the content of antibacterial particles in the liquid storage device was 1 part by mass. Everything else was the same as in Example 1.

[0086] Comparative Example 9 The liquid storage component was prepared according to the method of Example 1, except that the steps of impregnation, spin coating, and curing were omitted after freeze-drying, and the freeze-dried product was directly used as the liquid storage component. Everything else was the same as in Example 1.

[0087] The performance of the liquid storage devices prepared in the examples and comparative examples was tested, and the test methods included: Liquid absorption performance test: The liquid absorption rate of e-liquid in the storage container is measured using a permeameter at normal temperature and pressure.

[0088] Thermal stability test: The liquid storage component was heated at a constant temperature of 300℃ for 2 hours, and the weight loss rate was measured.

[0089] Antibacterial test: The diameter of the inhibition zone of Escherichia coli was tested using the agar diffusion method.

[0090] Porosity detection: Mercury intrusion porosimetry is used: taking advantage of the non-wetting property of mercury, pressure is applied to force mercury into the pores of the material, and the porosity and pore size distribution are calculated based on the relationship between pressure and mercury intrusion volume.

[0091] The testing steps include: 1. Sample pretreatment: Dry the sample to constant weight, load it into a sample tube, and evacuate to a pressure <10Pa.

[0092] 2. Mercury intrusion porosimetry test: Mercury is injected into the sample tube, and the pressure is gradually increased to 0.001 MPa. The volume of mercury injected at different pressures is recorded.

[0093] 3. Data calculation: The total mercury ingress volume is the total pore volume. Combined with the sample skeleton volume, the porosity is calculated. Contact angle test: The seat drop method is used, specifically including: Sample pretreatment: Cut the liquid storage component into 20mm×20mm sizes, press the liquid storage component to a uniform thickness (about 1-2mm) using a flat press, and dry it in a drying oven at 60℃ for 2 hours for later use.

[0094] Test Procedure: Using a contact angle meter, drop 2-3 μL of the target e-liquid onto the pretreated sample surface through a micro-syringe. After standing for 5 seconds, capture an image of the droplet and calculate the contact angle using the instrument's built-in software. Test 5 different points for each sample and take the average value. A contact angle < 90° indicates that the reservoir has hydrophilic properties; the smaller the value, the stronger the hydrophilicity. The performance test results of the liquid storage devices in the examples and comparative examples are shown in Table 1.

[0095] Table 1. Performance test results of the liquid storage devices in the examples and comparative examples.

[0096] The test results show that the liquid storage device of Example 1 has a high liquid absorption rate, a low weight loss rate, a large inhibition ring diameter, a high porosity, and a small contact angle. Its overall performance is significantly better than that of Comparative Examples 1-9.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0098] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the foregoing claims, any of the claimed embodiments can be used in any combination. The information disclosed in this background section is intended only to enhance the understanding of the general background of this application and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

Claims

1. A liquid storage device, characterized in that, The liquid storage device includes a fiber matrix and phase change microcapsules dispersed in the fiber matrix, wherein the thermal deformation temperature of the phase change microcapsules is 120℃~160℃.

2. The liquid storage device according to claim 1, characterized in that, The liquid storage device also includes antibacterial particles dispersed in the fiber matrix, which are used to destroy or inhibit microorganisms.

3. The liquid storage component according to claim 2, characterized in that, The antibacterial particles comprise chitosan and silver nanoparticles loaded on the chitosan.

4. The liquid storage device according to claim 1, characterized in that, The liquid storage device also includes a hydrophobic coating, which is used to reduce the surface free energy of the liquid storage device to inhibit liquid from separating from the liquid storage device when it is not in operation.

5. The liquid storage component according to claim 4, characterized in that, The hydrophobic coating comprises polydimethylsiloxane; and / or, The thickness of the hydrophobic coating is 2μm~3μm.

6. The liquid storage device according to any one of claims 1 to 5, characterized in that, The fiber matrix is ​​prepared by oxidative modification of microcrystalline cellulose; and / or, The fiber matrix is ​​a biodegradable matrix; and / or, The phase change microcapsule comprises a phase change material core and a polymer shell encapsulating the phase change material core, wherein the phase change material core is paraffin wax and the polymer shell is urea-formaldehyde resin; and / or, The molding process of the liquid storage component includes freeze-drying molding; and / or, The liquid storage component comprises 4-6 parts by weight of antibacterial particles, 4-6 parts by weight of hydrophobic coating, 65-75 parts by weight of fiber matrix, and 12-18 parts by weight of phase change microcapsules.

7. A method for preparing a liquid storage device, characterized in that, The method for preparing the liquid storage device as described in any one of claims 1-6 comprises: Obtain a slurry to be formed, wherein the slurry to be formed comprises a fiber matrix and phase change microcapsules; The slurry to be formed is injected into a mold and freeze-dried to obtain the liquid storage component.

8. The preparation method according to claim 7, characterized in that, After the freeze-drying process, the preparation method further includes: The freeze-dried structure is impregnated with a polymer solution, then spin-coated and cured to obtain the liquid storage component.

9. The preparation method according to claim 8, characterized in that, The preparation method also satisfies at least one of the following conditions: (I) The slurry to be formed further includes antibacterial particles, which include chitosan and silver nanoparticles loaded on the chitosan; (II) The fiber matrix is ​​prepared by oxidative modification of microcrystalline cellulose; (III) The phase change microcapsule comprises a phase change material core and a polymer shell encapsulating the phase change material core, wherein the phase change material core is paraffin wax and the polymer shell is urea-formaldehyde resin; (IV) The freeze-drying temperature is -150℃ to -120℃, and the freeze-drying time is 4h to 6h; (V) The polymer solution is an organic solution of polydimethylsiloxane, and the mass fraction of the polymer solution is 5%~8%; The rotational speed of the spin coating is 3000 rpm to 3500 rpm, and the spin coating time is 20 s to 30 s; The curing temperature is 120℃~132℃, and the curing time is 2h~2.5h.

10. An atomizing device, characterized in that, The atomizing device includes the liquid storage element as described in any one of claims 1-6.

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