Device and method for detecting carbon dioxide content of carbon dioxide aerosol cosmetics

Abstract

The device comprises a sample bottle, a collection assembly, a microporous filtration assembly, a carbon dioxide collection bottle, a gas-guide tube, at least one absorption tube and a vacuum pump connected to the downstream of the tail end absorption tube which are connected in sequence, and each bottle body and the pipeline form a closed gas path capable of keeping a pressure reduction state during use. In the working state of the vacuum pump, the to-be-detected carbon dioxide aerial fog cosmetic stably passes through the microporous filtering assembly through the collecting assembly under the action of negative pressure and then is efficiently collected into the carbon dioxide collecting bottle; under the action of the heating device, carbon dioxide in the liquid is released, enters the absorption pipe through the gas guide pipe and fully reacts with the absorption liquid to generate precipitates. The device is simple in structure and relatively low in cost, can realize effective solid-liquid separation of a sample and quantitative transfer of carbon dioxide under a decompression condition, reduces impurities and leakage interference, and remarkably improves the accuracy, repeatability and applicability of detection of the content of carbon dioxide in carbonic acid cosmetics.

Description

Technical Field

[0001] This invention relates to the field of carbon dioxide content detection technology, specifically to an apparatus and method for detecting carbon dioxide content in carbonated aerosol cosmetics. The apparatus is suitable for laboratory testing of liquid or semi-solid aerosol cosmetics containing carbonates and / or dissolved carbon dioxide. Background Technology

[0002] Carbonated cosmetics have become increasingly popular in recent years due to their unique cooling and soothing effects, especially carbonated aerosol cosmetics, which are favored by consumers for their pleasant application and ease of use. However, the carbon dioxide content in carbonated cosmetics directly affects their quality and efficacy. For example, excessive carbon dioxide content may lead to excessive pressure on the product packaging, posing a safety hazard; while insufficient content may significantly reduce the product's effectiveness. For carbonated aerosol cosmetics, carbon dioxide may act as both a propellant and a functional ingredient, making content control even more critical. Therefore, developing an accurate, rapid, simple, and low-cost method for detecting carbon dioxide content in carbonated cosmetics is of significant practical importance.

[0003] On the one hand, instrumental analysis methods such as infrared gas analysis and gas chromatography involve expensive equipment and high maintenance costs, and require sophisticated operating environments and personnel training, making them unsuitable for widespread adoption in general manufacturing quality control laboratories. Furthermore, strict control is still needed for sample pretreatment and quantitative gas release conditions; otherwise, incomplete carbon dioxide release or background gas interference can occur, affecting the accuracy and repeatability of the detection. In the application scenario of carbonated aerosol cosmetics, the sprayed aerosol sample must be reliably and stably collected into a sealed container. If leakage or instability occurs during the collection process, it can lead to insufficient sample representativeness, and even if the subsequent detection methods are highly accurate, the final results may still be distorted.

[0004] On the other hand, traditional methods that use homemade laboratory devices to introduce carbon dioxide into absorbents such as barium hydroxide for precipitation, weighing, or subsequent titration are mostly applicable to simple aqueous solutions. For carbonated cosmetics containing suspended solids, viscous phases, or multiphase systems, direct venting under reduced pressure or heating conditions can easily cause the sample to be "vacuum filtered" into the gas path or even the absorption bottle, resulting in a large amount of impurities, foam, or droplets mixed into the absorption system. This increases the difficulty of filtration and drying, introduces systematic errors, and reduces the reliability of the measurement results. For carbonated cosmetics in aerosol form, if only an open container is used to collect the spray directly, carbon dioxide loss or external air mixing can easily occur during the spraying and transfer process, making it difficult to guarantee collection efficiency and accuracy. It is also not conducive to the subsequent quantitative release of carbon dioxide from the sample under reduced pressure and heating conditions.

[0005] Furthermore, some existing devices do not properly separate the liquid and gas phase transport paths, allowing solid particles and colloidal components in the sample to enter the absorption tube with the gas flow or droplets, causing blockages or adding extra mass to the filter paper. Some devices also lack a well-sealed gas path, making carbon dioxide leakage during transport or interference from ambient carbon dioxide, thus affecting the accuracy of the measurement. For companies needing to repeat tests under standard experimental conditions, existing devices still have significant shortcomings in terms of structural simplicity, operational controllability, and adaptability to complex matrices. Particularly in the detection of carbonated aerosol cosmetics, achieving an integrated, closed-loop operation from spray collection and depressurization to subsequent absorption detection while ensuring collection efficiency and accurate sample reproduction remains a challenge for current technology.

[0006] Therefore, it is necessary to provide a detection device that is simple in structure, easy to build and operate, and capable of effectively separating liquid and solid impurities in the sample under reduced pressure, and quantitatively releasing and transferring carbon dioxide to the absorption tube in a closed gas path. This device should be used in conjunction with a collection device suitable for carbonated aerosol cosmetics, so that the aerosol sample can be efficiently and stably introduced into a sealed sample bottle, achieving effective connection between the collection and detection processes, thereby improving the accuracy, repeatability and applicability of carbon dioxide content determination in carbonated aerosol cosmetics. Summary of the Invention

[0007] The purpose of this invention is to address the problems existing in the detection of carbon dioxide content in carbonated cosmetics, such as complex sample matrices, easy entry of solid impurities into the gas path or absorption system, and easy leakage or incomplete absorption of carbon dioxide. This invention provides a device and method for detecting carbon dioxide content in carbonated aerosol cosmetics. By achieving effective separation of the sample liquid and solid impurities under reduced pressure, and quantitatively releasing carbon dioxide in a closed gas path and introducing it into the absorption tube to fully react with the absorption liquid, higher detection accuracy and repeatability are achieved. Furthermore, the device has a simple structure, low cost, and is easy to build and promote in laboratory environments. Specifically designed for carbonated aerosol cosmetics stored and used in aerosol form, the invention, with its collection nozzle and sample inlet switch structure, achieves sealed, efficient collection and transfer of aerosol samples, further ensuring the representativeness and comparability of the detection results to the actual product state.

[0008] According to a first aspect of the present invention, an apparatus for detecting the carbon dioxide content in carbonated cosmetic mists is provided, comprising: Sample vials are used to hold samples introduced by the carbon dioxide aerosol cosmetic to be tested. The collection assembly includes a collection nozzle for detachably communicating with the spray valve of the carbonated aerosol cosmetic and a switch structure disposed at the sample inlet end of the sample bottle. The switch structure is used to open during the sample inlet to allow the carbonated aerosol cosmetic to be sprayed out and introduced into the sample bottle, and to close after the sample inlet is completed to disconnect the communication between the sample bottle and the carbonated aerosol cosmetic. A carbon dioxide collection bottle, used to receive liquid from the sample bottle under reduced pressure and release carbon dioxide gas from the liquid under heating conditions; A microporous filter assembly is disposed in the communication passage between the sample bottle and the carbon dioxide collection bottle, used to trap solid impurities in the sample while allowing liquid to pass through; A heating device for heating the carbon dioxide collection bottle; At least one absorption tube, which is connected to the carbon dioxide collection bottle via a gas guide tube, is used to hold the absorption liquid and absorb carbon dioxide gas from the carbon dioxide collection bottle during use. A vacuum pump, connected downstream of the absorption tube, creates a closed gas path consisting of the sample vial, microporous filter assembly, carbon dioxide collection bottle, gas delivery tube, and absorption tube. During the operation of the vacuum pump, the sample liquid is drawn into the carbon dioxide collection bottle through the microporous filter component under negative pressure. The carbon dioxide gas released under the action of the heating device enters the absorption tube through the gas guide tube and reacts with the absorption liquid.

[0009] In some technical solutions, the absorption tubes are multiple and connected in series along the gas flow direction, adjacent absorption tubes are connected in sequence through gas guide tubes, and the outlet of the end absorption tube is connected to the vacuum pump through a gas guide tube.

[0010] In some technical solutions, the number of absorption tubes is three, and each absorption tube is filled with an equal volume and the same concentration of barium hydroxide solution during use to ensure that the incoming carbon dioxide gas is fully absorbed.

[0011] In some technical solutions, the mouths of the sample bottle, the carbon dioxide collection bottle, and the absorption tube are all sealed with rubber stoppers. The rubber stoppers have through holes for the gas guide tube to pass through and / or for connection with the microporous filter assembly, so as to ensure the airtightness of the system under reduced pressure conditions.

[0012] In some technical solutions, the microporous filtration assembly includes a filter membrane clamping structure disposed between the sample bottle and the carbon dioxide collection bottle, and a microporous filter membrane clamped therein.

[0013] In some technical solutions, the pore size of the microporous filter membrane is 0.22 μm, which is used to effectively retain solid impurities in the sample while allowing liquid to pass through smoothly.

[0014] In some technical solutions, the heating device is a water bath heating device, and the carbon dioxide collection bottle can be placed in the water bath, and the release rate of carbon dioxide can be controlled by adjusting the water bath temperature.

[0015] In some technical solutions, a gas disperser is provided at the front end of the gas guide tube inserted into the absorption tube. The gas disperser is a flexible tube segment closed at one end, and multiple tiny gas outlet holes are opened along the circumference of the flexible tube segment to disperse the carbon dioxide gas entering the absorption tube into tiny bubbles to increase the gas-liquid contact area.

[0016] In some technical solutions, the flexible tube segment is a latex tube, and there are four micro air vents with a diameter of 0.1 mm.

[0017] In some technical solutions, the device further includes a gas guide valve disposed on a gas guide pipe between the carbon dioxide collection bottle and the absorption tube, the gas guide valve being used to adjust the flow rate of carbon dioxide gas entering the absorption tube when the vacuum pump is working.

[0018] Some technical solutions also include a base, bracket, or clamping structure for supporting and fixing the sample bottle, carbon dioxide collection bottle, and absorption tube, so as to fix the relative positions of each bottle and gas delivery tube.

[0019] According to a second aspect of the present invention, a method for detecting the carbon dioxide content in carbonated cosmetic mist using the above-described apparatus is further provided, comprising the following steps: The spray valve of the carbon dioxide aerosol cosmetic to be tested is detachably connected to the collection nozzle. The switch structure at the sample inlet of the sample bottle is opened and the spray valve of the carbon dioxide aerosol cosmetic is pressed, so that the carbon dioxide aerosol cosmetic is sprayed out from the spray valve and introduced into the sample bottle through the collection nozzle. After the predetermined injection volume is reached, the spray valve is released and the switch structure is closed. The vacuum pump is started, and under reduced pressure, the sample liquid in the sample bottle is drawn into the carbon dioxide collection bottle through the microporous filter component under negative pressure, thereby achieving the separation of sample liquid from solid impurities. The carbon dioxide collection bottle is controlled to be heated under the action of the heating device, so that the carbon dioxide gas dissolved in the sample liquid in the bottle is released at a certain rate and quantitatively enters the absorption tube through the gas guide tube, where it reacts with the absorption liquid to generate reaction products. The carbon dioxide content in the carbonated aerosol cosmetic is determined based on the amount of the reaction product.

[0020] In some technical solutions, the absorbent is a barium hydroxide solution, and the reaction product is a barium carbonate precipitate; the step of determining the carbon dioxide content in the carbonated aerosol cosmetic based on the amount of the reaction product includes: The reaction solutions in each absorption tube are combined and subjected to solid-liquid separation to obtain barium carbonate precipitate. The barium carbonate precipitate is dried until constant weight, the mass of barium carbonate is weighed, and the carbon dioxide content in the carbonic aerosol cosmetic is calculated based on the stoichiometric relationship between barium carbonate and carbon dioxide.

[0021] The present invention, by employing the above technical solution, has at least the following beneficial effects: Firstly, this invention achieves solid-liquid separation of carbonated cosmetic samples under reduced pressure by arranging the sample bottle, microporous filter assembly, and carbon dioxide collection bottle in series. When the vacuum pump is operating, the sample liquid is drawn into the carbon dioxide collection bottle through the microporous filter membrane under negative pressure. The microporous filter assembly effectively traps solid particles, gel blocks, or other insoluble substances in the sample, while allowing the liquid containing dissolved carbon dioxide to pass through smoothly. This significantly reduces the interference of solid impurities on subsequent absorption reactions and precipitation separation processes, laying the foundation for accurate carbon dioxide content determination. Simultaneously, combined with the collection nozzle detachably connected to the aerosol spray valve and the switching structure at the sample bottle inlet, the carbonated aerosol cosmetic can be introduced into the sealed sample bottle during the spraying stage and seamlessly connected to the subsequent reduced pressure transfer process, avoiding carbon dioxide loss and the introduction of outside air caused by open collection.

[0022] Secondly, this invention provides a gentle and controllable heating of the sample liquid transferred to the collection bottle by installing a heating device outside the carbon dioxide collection bottle, preferably using a water bath heating method. This allows the carbon dioxide in the liquid phase to fully escape under sealed conditions. The carbon dioxide gas, driven by reduced pressure, enters the downstream absorption tube through the gas guide tube and reacts with the absorption liquid. This helps avoid sample loss and carbon dioxide escape caused by violent boiling or foaming, improving the controllability and integrity of the carbon dioxide release process.

[0023] Furthermore, this invention connects to the gas phase space of the carbon dioxide collection bottle via at least one absorption tube. Preferably, multiple absorption tubes are arranged in series along the gas flow direction, and each absorption tube is filled with an absorbent, such as barium hydroxide solution, so that carbon dioxide gas from the collection bottle is absorbed step-by-step through each absorption tube. This multi-stage series absorption structure not only ensures sufficient absorption capacity under high carbon dioxide release conditions, reducing the risk of carbon dioxide breakthrough, but also facilitates the assessment of absorption sufficiency by observing the reaction in the final absorption tube, thereby improving the reliability and traceability of the detection results. In conjunction with a gas guide valve located on the gas guide pipe between the carbon dioxide collection bottle and the absorption tubes, the gas flow rate entering the absorption tubes can be adjusted, reducing the impact of instantaneous flow fluctuations on absorption efficiency and precipitation formation, resulting in more consistent detection results under different pressure levels or injection intensities.

[0024] Furthermore, this invention incorporates a gas disperser at the insertion point of the gas delivery tube into the front absorption tube. The gas disperser is preferably a flexible tube segment, such as a latex tube, that is closed at one end and has multiple tiny gas outlets in the circumferential direction. Carbon dioxide gas is dispersed into the absorption liquid as fine bubbles through these tiny outlets, significantly increasing the gas-liquid contact area and contact time, thereby improving the mass transfer efficiency of the absorption reaction. This allows for more complete and faster carbon dioxide absorption while maintaining a simple device structure, which is beneficial for shortening the time required for a single measurement.

[0025] Furthermore, this invention seals the sample bottle, carbon dioxide collection bottle, and each absorption tube with rubber stoppers, and creates through holes in the rubber stoppers for the gas delivery tube and the microporous filter assembly. This creates a closed gas path under vacuum, effectively reducing carbon dioxide leakage during transmission and interference from ambient air, thus improving the system's airtightness and the accuracy and repeatability of the measurement results. In the detection scenario of carbonated aerosol cosmetics, this closed gas path extends from the spray collection end to the absorption detection end, minimizing open operation throughout the process and significantly reducing the impact of operator skill differences and environmental fluctuations on the test results.

[0026] Furthermore, the detection method in this case utilizes the aforementioned device to effectively separate the liquid sample from solid impurities through a microporous filter component under reduced pressure. Then, carbon dioxide is released in a concentrated and controllable manner under water bath heating and quantitatively introduced into the absorption liquid in a closed gas path. The carbon dioxide content is then inferred from the precipitate mass, achieving an integrated detection process. Compared to traditional methods relying on expensive instruments or simple homemade devices, this method features a gentle and controllable venting process, a clear carbon dioxide transfer path with minimal leakage, and effective isolation of sample impurities from the absorption system. This significantly reduces the interference of foam, droplets, and solid particles on precipitation separation and weighing, ensuring the accuracy and repeatability of the detection results. Simultaneously, the operation steps are clear, and the conditions are easy to master, making it suitable for widespread application in general quality inspection laboratories, especially for the routine detection and quality control of carbon dioxide content in complex carbonated cosmetics. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings and their markings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the device for detecting carbon dioxide content in carbonated mist cosmetics according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the sampling process described in an embodiment of the present invention.

[0029] The meanings of the symbols marked in the figure are as follows: 1—Sample bottle, 2—Carbon dioxide collection bottle, 3—Rubber stopper, 4—Water bath heating device, 5—Gas delivery tube, 6—Absorption tube, 7—Gas delivery valve, 10—Gas disperser, 11—Vacuum pump. Detailed Implementation

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0031] To keep the drawings concise, each figure only schematically shows the parts relevant to the invention, and these do not represent the actual structure of the product. Furthermore, to facilitate understanding, in some figures, only one of components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0032] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0033] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] According to one embodiment of the present invention, such as Figure 1 A device for detecting carbon dioxide content in carbonated cosmetic mist is provided, comprising a sample bottle 1, a collection assembly, a microporous filter assembly, a carbon dioxide collection bottle 2, a gas guide tube 5, at least one absorption tube 6, and a vacuum pump 11 connected downstream of the end absorption tube in sequence. Each bottle and tube constitutes a closed gas path that can be kept in a depressurized state during use.

[0035] In practice, sample bottle 1 is preferably made of pressure-resistant transparent glass and is used to hold a certain volume of the carbonic acid mist cosmetic to be tested, so that the operator can easily observe the foaming situation and the liquid level.

[0036] In a specific implementation, the collection component includes a collection nozzle for detachable communication with the spray valve of the carbonated aerosol cosmetic and a switch structure located at the sample inlet end of the sample bottle. The switch structure is used to open during the sample injection process to allow the carbonated aerosol cosmetic to be sprayed out and introduced into the sample bottle, and to close after the sample injection is completed to isolate the communication between the sample bottle and the carbonated aerosol cosmetic.

[0037] In the specific design, the microporous filter assembly is positioned in the connecting passage between sample bottle 1 and carbon dioxide collection bottle 2 to effectively separate solid impurities from the liquid phase in the sample during vacuum aspiration. In a preferred embodiment, the microporous filter assembly includes a membrane clamping structure and a microporous filter membrane clamped therein. The membrane clamping structure can be two mating clamping pieces with a through-hole in the middle. A microporous filter membrane is clamped between the two clamping pieces and secured by threads, snaps, or clamping rings to ensure the microporous filter membrane remains stable and does not shift under vacuum conditions. The microporous filter membrane is preferably a 0.22 μm pore size membrane. During operation, when the vacuum pump 11 is working, the sample liquid enters the microporous filter assembly through the through-hole at the sample bottle opening under negative pressure. Solid particles, colloidal clumps, and other impurities in the sample are trapped on the filter membrane, while the liquid phase containing dissolved carbon dioxide can smoothly pass through the filter membrane into the carbon dioxide collection bottle 2.

[0038] In a specific implementation, the carbon dioxide collection bottle 2 is preferably made of pressure-resistant transparent glass. The mouth of the carbon dioxide collection bottle 2 is also sealed with a rubber stopper. The rubber stopper has at least two through holes, one of which is used to connect to the liquid inlet from the microporous filter assembly, and the other through hole is used to connect to the gas guide tube leading to the downstream absorption tube. In a preferred embodiment, the carbon dioxide collection bottle 2 is arranged in the water bath heating device 4. By adjusting the water bath temperature, the release rate and degree of carbon dioxide are controlled. When the vacuum pump 11 is continuously working, the carbon dioxide gas released by the sample liquid in the carbon dioxide collection bottle 2 under heating conditions occupies the gas phase space inside the bottle and is drawn into the downstream absorption tube through the gas guide tube under negative pressure. The gas guide tube is equipped with a gas guide valve 7, which is a solenoid valve that can regulate the gas flow rate. At the same time, since the sample bottle end is still under reduced pressure, the sample liquid will continue to slowly transfer towards the carbon dioxide collection bottle 2 through the microporous filter assembly.

[0039] In a preferred embodiment, the absorption tubes 6 are multiple and connected in series along the gas flow direction. For example, three glass absorption tubes with basically the same structure are connected in series through the gas guide tubes 5. The mouth of each absorption tube 6 is sealed with a rubber stopper 3, which has a gas inlet and a gas outlet. The outlet of the previous absorption tube is connected to the inlet of the next absorption tube through the gas guide tube 5, and the outlet of the last absorption tube is connected to the inlet of the vacuum pump 11 through the gas guide tube 5. In use, an equal volume and the same concentration of barium hydroxide solution are added to each absorption tube as an absorbent to react with the incoming carbon dioxide gas to form a precipitation reaction. The multi-stage series absorption structure ensures that carbon dioxide can be fully absorbed under different sample carbon dioxide release conditions.

[0040] In a specific implementation, a gas disperser 10 is installed at the foremost position of the gas guide tube 5 inserted into the absorption tube 6 to further improve the gas-liquid contact efficiency and carbon dioxide mass transfer rate. In a preferred embodiment, the gas disperser 10 consists of a flexible tube segment closed at one end. This flexible tube segment can be made of latex tubing, and its sidewall has multiple micro-vent holes along its circumference, for example, four vent holes with a diameter of approximately 0.1 mm. During assembly, the end of the gas guide tube 5 is sealed to one end of the latex tubing. The closed end of the latex tubing extends below the surface of the barium hydroxide solution in the absorption tube 6. After carbon dioxide gas enters the latex tubing through the gas guide tube 5, it enters the absorption liquid uniformly in the form of multiple tiny bubbles through the micropores on the sidewall. Compared to a single large bubble, this significantly increases the gas-liquid interface area and contact time, thereby improving the efficiency of carbon dioxide absorption by barium hydroxide and the formation of barium carbonate precipitate.

[0041] In a preferred embodiment of the present invention, the sample bottle 1, the carbon dioxide collection bottle 2, and multiple absorption tubes are integrally mounted on the same base, bracket, or clamping structure. The base can be made of metal or plastic, and the bracket is equipped with multiple spring clips or ring clamps to clamp each bottle, ensuring a stable spatial position during use. The gas guide tube 5 is arranged at an appropriate length between the bottles and can be fixed to the bracket using buckles or straps to prevent the tube from shaking or bending during vacuum pump operation or water bath operation, thereby reducing the risk of changes in gas-liquid contact state or accidental detachment caused by vibration. Through the cooperation of the aforementioned base and bracket, the entire device forms a compact integrated detection unit, which is convenient for placement on the laboratory table and long-term use.

[0042] In this specific embodiment, the bottle openings of each bottle are sealed with rubber stoppers. The rubber stoppers are press-fitted to the bottle openings to ensure no leakage occurs under reduced pressure. The through holes on the rubber stoppers are reliably connected to the gas guide tubes 5 through tight fits or sealing components, ensuring that the sample bottle 1, microporous filter assembly, carbon dioxide collection bottle 2, each absorption tube, and vacuum pump 11 form a closed gas path.

[0043] The following explains the principle and process for detecting carbon dioxide content in carbonated cosmetic mists: Detection Principle: Barium hydroxide solution reacts chemically with carbon dioxide to produce barium carbonate precipitate and water. The chemical equation is: Ba(OH)₂ + CO₂ = BaCO₃↓ + H₂O. When carbon dioxide is in excess, it will continue to react with barium carbonate and water to produce soluble barium bicarbonate. The chemical equation is: BaCO₃ + CO₂ + H₂O = Ba(HCO₃)₂. By detecting the changes in relevant physical quantities before and after the reaction, the carbon dioxide content in carbonated cosmetics can be indirectly calculated.

[0044] Testing steps: Prepare the necessary reagents and instruments Reagent: Barium hydroxide solution (0.1 mol / L).

[0045] Instruments: sample bottles, carbon dioxide absorption bottles, vacuum pump, absorption tube, gas delivery tube, pipette, balance, microporous filter assembly, water bath heating device, drying oven, etc.

[0046] Experimental steps: Sample preparation: Shake the sample thoroughly, replace the collection nozzle, and hold it at a certain angle (e.g., Figure 2 When the sampling angle a = 5-10°, rotate the bottle to transfer the material into the sealed sample bottle (record the weight as W1). Add a 0.22um microporous filter membrane between the sample bottle and the carbon dioxide collection bottle to avoid vacuum filtration and ensure the collection of pure carbon dioxide.

[0047] 2. Absorption of carbon dioxide: Accurately measure a certain volume of barium hydroxide solution using a pipette and transfer it into three absorption tubes. Connect the three absorption tubes in series, with one end of the third absorption tube connected to a vacuum pump to seal the entire apparatus. Turn on the water bath heating and the vacuum pump to slowly increase the vacuum level, allowing carbon dioxide gas to be slowly introduced into the barium hydroxide solution through the gas delivery tube, ensuring a complete reaction between the carbon dioxide and barium hydroxide.

[0048] 3. Filtration and washing: After the reaction is complete, collect the liquid from the three absorption tubes and filter it (the filter paper is pre-dried to constant weight and the weight is recorded as W2). Rinse the three absorption tubes with a small amount of water several times and collect the washing liquid before filtering to ensure that all barium carbonate precipitate is collected.

[0049] 4. Drying and Weighing: Transfer the collected precipitate to an oven and dry it at 105℃ until constant weight. Then weigh the barium carbonate precipitate using a balance (record the weight as W3). Based on the mass of barium carbonate, calculate the amount of carbon dioxide, and thus determine the carbon dioxide content.

[0050] Calculation formula: Step 1: Calculate the amount of substance n(BaCO3).

[0051] Step 2: Calculate the amount of carbon dioxide (CO2) that participates in the reaction based on the chemical equation. From the chemical equation CO2 + Ba(OH)2 = BaCO3↓ + H2O, we know that the stoichiometric ratio of CO2 to BaCO3 is 1:1. Therefore, the amount of carbon dioxide participating in the reaction is n(CO2) = n(BaCO3).

[0052] Step 3: Calculate the mass of carbon dioxide that participated in the reaction. m(CO2) = n(BaCO3) * 44 g / mol Step 4: Calculate the carbon dioxide content in the sample .

[0053] The method for detecting carbon dioxide content in carbonated cosmetic mists provided by this invention has the following advantages: Highly efficient collection: The sealed design of the entire device effectively improves the collection efficiency of aerosol products. It avoids gas leakage and sample distortion, making the collection process more stable and reliable.

[0054] High accuracy: The specific chemical reagents used have high selectivity for carbon dioxide, and by precisely controlling the reaction conditions and establishing accurate mathematical models, interference from other ingredients in cosmetics is effectively avoided, greatly improving the accuracy of the test results. During the collection process, increasing the sampling angle and rotation ensures that the gas and material are fully collected, guaranteeing the accuracy of subsequent testing.

[0055] Easy to operate: The testing device has a relatively simple structure, and operators can master the testing method after only simple training. Furthermore, each step in the testing process is clearly defined and easy to implement.

[0056] Low cost: The detection device used does not require expensive large equipment, the main components are inexpensive, and the chemical reagents are relatively cheap, which greatly reduces the detection cost and is conducive to its widespread application in cosmetic manufacturing enterprises.

[0057] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A device for detecting carbon dioxide content in carbonated cosmetic mists, characterized in that, include: Sample vials are used to hold samples introduced by the carbon dioxide aerosol cosmetic to be tested. The collection assembly includes a collection nozzle for detachably communicating with the spray valve of the carbonated aerosol cosmetic and a switch structure disposed at the sample inlet end of the sample bottle. The switch structure is used to open during the sample inlet to allow the carbonated aerosol cosmetic to be sprayed out and introduced into the sample bottle, and to close after the sample inlet is completed to disconnect the communication between the sample bottle and the carbonated aerosol cosmetic. A carbon dioxide collection bottle, used to receive liquid from the sample bottle under reduced pressure and to release carbon dioxide gas from the liquid under heating conditions; A microporous filter assembly is disposed in the communication passage between the sample bottle and the carbon dioxide collection bottle, used to trap solid impurities in the sample while allowing liquid to pass through; A heating device for heating the carbon dioxide collection bottle; At least one absorption tube, which is connected to the carbon dioxide collection bottle via a gas guide tube, is used to hold the absorption liquid and absorb carbon dioxide gas from the carbon dioxide collection bottle during use. A vacuum pump, connected downstream of the absorption tube, creates a closed gas path consisting of the sample vial, microporous filter assembly, carbon dioxide collection bottle, gas delivery tube, and absorption tube. During the operation of the vacuum pump, the sample liquid is drawn into the carbon dioxide collection bottle through the microporous filter assembly under negative pressure. The carbon dioxide gas released under the action of the heating device enters the absorption tube through the gas guide tube and reacts with the absorption liquid.

2. The apparatus according to claim 1, characterized in that, The absorption tubes are multiple and connected in series along the gas flow direction. Adjacent absorption tubes are connected in sequence through gas guide tubes, and the outlet of the end absorption tube is connected to the vacuum pump through a gas guide tube.

3. The apparatus according to claim 2, characterized in that, The number of absorption tubes is three, and each absorption tube is filled with an equal volume and the same concentration of barium hydroxide solution during use to ensure that the incoming carbon dioxide gas is fully absorbed.

4. The apparatus according to any one of claims 1 to 3, characterized in that, The mouths of the sample bottle, the carbon dioxide collection bottle, and the absorption tube are all sealed with rubber stoppers. The rubber stoppers have through holes for the gas guide tube and / or for connection with the microporous filter assembly to ensure the airtightness of the system under reduced pressure conditions.

5. The apparatus according to claim 1, characterized in that, The microporous filtration assembly includes a filter membrane clamping structure disposed between the sample bottle and the carbon dioxide collection bottle, and a microporous filter membrane clamped therein. The microporous filter membrane is used to effectively trap solid impurities in the sample while allowing liquid to pass through smoothly.

6. The apparatus according to claim 1, characterized in that, The heating device is a water bath heating device. The carbon dioxide collection bottle can be placed in the water bath, and the release rate and degree of carbon dioxide can be controlled by adjusting the water bath temperature.

7. The apparatus according to any one of claims 1 to 3, characterized in that, A gas disperser is installed at the front end of the gas guide tube inserted into the absorption tube. The gas disperser is a flexible tube segment closed at one end. Multiple tiny gas outlet holes are opened along the circumference of the flexible tube segment to disperse the carbon dioxide gas entering the absorption tube into tiny bubbles to increase the gas-liquid contact area.

8. The apparatus according to claim 7, characterized in that, The flexible tube section is a latex tube, and there are four tiny air vents with a diameter of 0.1 mm.

9. The apparatus according to claim 1, characterized in that, The device also includes a gas guide valve disposed on a gas guide pipe between the carbon dioxide collection bottle and the absorption tube, the gas guide valve being used to adjust the flow rate of carbon dioxide gas entering the absorption tube when the vacuum pump is working.

10. The apparatus according to claim 1, characterized in that, It also includes a base, bracket, or clamping structure for supporting and fixing the sample bottle, carbon dioxide collection bottle, and absorption tube, so as to fix the relative position of each bottle and gas delivery tube.

11. A method for detecting the carbon dioxide content in carbonated aerosol cosmetics using the apparatus as described in any one of claims 1 to 10, characterized in that, Includes the following steps: The spray valve of the carbon dioxide aerosol cosmetic to be tested is detachably connected to the collection nozzle. The switch structure at the sample inlet of the sample bottle is opened and the spray valve of the carbon dioxide aerosol cosmetic is pressed, so that the carbon dioxide aerosol cosmetic is sprayed out from the spray valve and introduced into the sample bottle through the collection nozzle. After the predetermined injection volume is reached, the spray valve is released and the switch structure is closed. The vacuum pump is started, and under reduced pressure, the sample liquid in the sample bottle is drawn into the carbon dioxide collection bottle through the microporous filter component under negative pressure, thereby achieving the separation of sample liquid from solid impurities. The carbon dioxide collection bottle is heated under the action of the heating device, so that the carbon dioxide gas dissolved in the sample liquid in the bottle is released and quantitatively enters the absorption tube through the gas guide tube, where it reacts with the absorption liquid to generate reaction products. The carbon dioxide content in the carbonated aerosol cosmetic is determined based on the amount of reaction products.

12. The method according to claim 11, characterized in that, The absorbent is a barium hydroxide solution, and the reaction product is a barium carbonate precipitate; the step of determining the carbon dioxide content in the carbonated aerosol cosmetic based on the amount of the reaction product includes: The reaction solutions in each absorption tube are combined and subjected to solid-liquid separation to obtain barium carbonate precipitate. The barium carbonate precipitate is dried until constant weight, the mass of barium carbonate is weighed, and the carbon dioxide content in the carbonic aerosol cosmetic is calculated based on the stoichiometric relationship between barium carbonate and carbon dioxide.

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