Hot water capsule structure

Abstract

The hot water capsule structure comprises an outer layer, an inner layer, a temperature control layer and a visual indication layer, and the outer layer is made of a water-soluble polymer material and wraps the inner layer and the temperature control layer; the inner layer contains a mixture of calcium oxide and citric acid in a mass ratio of 3: 1; the temperature control layer is a porous heat insulation material layer wrapping the inner layer; and the visual indication layer is arranged on the outer surface of the outer layer. Therefore, an external power supply is not needed, the diameter is smaller than or equal to 2 cm, the weight is smaller than 10 g, the capsule can be heated after being put into water, the capsule is simple and portable, can be quickly dissolved within 20-30 seconds, trace elements such as calcium and magnesium can be supplemented through efficient heating, the water temperature is indicated by the temperature sensing ink, the material is authenticated by FDA, accurate matching and temperature control are achieved, risks are eradicated, reaction residues can be naturally degraded, and the capsule is green and environmentally friendly.

Description

Technical Field

[0001] This application relates to the technical field of raising the temperature of drinking water and supplementing minerals, and particularly relates to a hot water capsule structure. Background Art

[0002] In daily life, especially in cold seasons, people's demand for conveniently obtaining drinking water at an appropriate temperature is very urgent. Traditional drinking water heating methods, such as using electric kettles, immersion heaters, etc., require a power source, and the heating process takes a long time, making it difficult to achieve in outdoor or powerless places. Some existing portable heating products on the market either have poor heating effects and cannot accurately control the temperature, or have complex structures and high costs, making them inconvenient for large-scale promotion and use.

[0003] Currently, there are also some products that attempt to heat drinking water through chemical reactions, but they often have potential safety hazards. For example, some products may cause the imbalance of the solution's acidity and alkalinity during the reaction, affecting the quality of drinking water and even posing a potential threat to human health. At the same time, most of these products do not consider the supplementation of minerals in drinking water and cannot meet people's diverse needs for healthy drinking. In addition, in terms of user experience, existing heating products lack intuitive heating status indicators, making it difficult for users to accurately judge whether the drinking water has reached a temperature at which it can be safely consumed. Based on the above problems, it is of great practical significance to develop a hot water capsule structure that is safe, convenient, efficient and can meet users' diverse needs. Summary of the Invention

[0004] This application aims to solve at least one of the technical problems in the related art to some extent.

[0005] To this end, the first object of this application is to provide a hot water capsule structure that does not require an external power source, gets rid of the place restriction, can heat drinking water anytime and anywhere, has a diameter ≤ 2 cm and a weight < 10 g, fits the bottle mouth and is portable, and the operation only requires putting the capsule into water, which is simple and easy to use.

[0006] The second object of this application is to provide a hot water capsule structure that can dissolve quickly and trigger efficient heating in 20 - 30 seconds, meet immediate needs, add mineral fortifiers to achieve the supplementation of calcium, magnesium and multiple trace elements, and use temperature-sensitive color-changing ink to intuitively indicate the water temperature to ensure drinking safety.

[0007] The third object of this application is to provide a hot water capsule structure, in which the residual calcium citrate and vermiculite after the reaction can be naturally degraded and discarded with the bottle without pollution, practicing green and sustainable development.

[0008] The fourth object of the present application is to provide a hot water capsule structure. The outer layer is FDA-certified, and the calcium oxide meets the food-grade standard, ensuring safety from the source of materials. The reactants are precisely proportioned to maintain the pH at 6.5 - 7.5, and the temperature control layer stabilizes the water temperature at 40°C - 50°C, eliminating reaction risks.

[0009] To achieve the above object, an embodiment of the first aspect of the present application provides a hot water capsule structure, including an outer layer, an inner layer, a temperature control layer, and a visual indication layer. Among them, the outer layer is made of a water-soluble polymer material and wraps the inner layer and the temperature control layer; the inner layer contains a mixture of calcium oxide and citric acid with a mass ratio of 3:1; the temperature control layer is a porous heat-insulating material layer that wraps the inner layer; the visual indication layer is disposed on the outer surface of the outer layer.

[0010] The hot water capsule structure of the embodiment of the present application does not require an external power supply, has a diameter ≤ 2 cm and a weight < 10 g. It can be heated by dropping it into water, is simple and portable, dissolves quickly in 20 - 30 seconds, can efficiently heat water and supplement trace elements such as calcium and magnesium, and the temperature-sensitive ink indicates the water temperature. The materials are FDA-certified, the temperature is precisely controlled, risks are eliminated, and the reaction residues can be naturally degraded, practicing green environmental protection.

[0011] In addition, the hot water capsule structure proposed above according to the present application may further have the following additional technical features:

[0012] In an embodiment of the present application, the water-soluble polymer material is pullulan or HPMC. The outer layer completely wraps the inner layer and quickly dissolves within 20 to 30 seconds after contacting water, thereby triggering the reaction of the internal substances. The calcium oxide (CaO) powder and solid citric acid are evenly mixed and wrapped by the inner layer, and the inner layer is located in the inner space of the outer layer. The temperature control layer surrounds and wraps the outer layer of the calcium oxide (CaO) powder in the inner layer and is composed of vermiculite or diatomite materials, slowing down the reaction rate of calcium oxide with water and stably controlling the water temperature between 40°C and 50°C.

[0013] In an embodiment of the present application, optional mineral fortifying additives include trace food-grade magnesium sulfate (MgSO4), and chelate forms of zinc and selenium trace elements can be selectively added. The mineral fortifying additives are encapsulated in the inner layer together with the calcium oxide (CaO) powder and solid citric acid in the inner layer, and the heat released by the reaction is used to accelerate their own dissolution to achieve mineral fortification and supplementation of drinking water, wherein the calcium ion concentration is controlled at ≤ 50 mg / L, meeting the drinking water standard.

[0014] In an embodiment of the present application, the visual indication layer is a temperature-sensitive color-changing ink disposed on the outer surface of the outer layer. When the hot water capsule completes the heating process of drinking water and the water temperature reaches the safe drinking range, the temperature-sensitive color-changing ink changes from the initial blue to white, thereby providing a visual prompt to the user.

[0015] In one embodiment of the present application, the overall dimensions of the hot water capsule are designed to meet the requirements that the diameter ≤ 2 cm and the weight < 10 g, so as to fit the standard mineral water bottle mouth, facilitate the user to directly put it into the bottle for use, and be convenient for the user to carry around.

[0016] In one embodiment of the present application, the material used for the outer layer has passed the FDA food contact material certification, ensuring no risk of plasticizer migration. The food-grade calcium oxide has a purity ≥ 99%, meeting the GB25572-2010 standard. After the reaction, residual substances such as calcium citrate and undissolved vermiculite can be naturally degraded into harmless substances, causing no harm to the environment after being discarded with the bottle.

[0017] The reaction process of the hot water capsule is as follows:

[0018] When the hot water capsule is put into water, the outer layer quickly dissolves in water, releasing calcium oxide (CaO) and citric acid in the inner layer. Calcium oxide (CaO) undergoes a chemical reaction with water.

[0019]

[0020] At the same time, citric acid immediately undergoes a neutralization reaction with the generated calcium hydroxide.

[0021] Ca(OH)2 + 2C6H8O7 → Ca(C6H7O7)2 + 2H2O

[0022] Through this series of reactions, the pH value of the solution is maintained between 6.5 and 7.5, and heat is generated to raise the water temperature. The temperature control layer continuously plays a role in slowing down the reaction rate and stabilizing the water temperature during the reaction.

[0023] The advantages of the present application compared with the existing technologies are as follows:

[0024] (1) It does not require an external power supply, getting rid of the venue restriction, heating drinking water anytime and anywhere. With a diameter ≤ 2 cm and a weight < 10 g, it fits the bottle mouth and is portable. The operation only requires putting the capsule into water, being simple and easy to use.

[0025] (2) It dissolves quickly in 20 - 30 seconds to trigger efficient heating, meeting immediate needs. Adding mineral fortifiers to achieve the supplement of calcium, magnesium and multiple trace elements. The temperature-sensitive color-changing ink intuitively indicates the water temperature, ensuring drinking safety.

[0026] (3) The residual calcium citrate and vermiculite from the reaction can be naturally degraded and cause no pollution after being discarded with the bottle, practicing green and sustainable development.

[0027] (4) The outer layer has passed the FDA certification, and the calcium oxide meets the food-grade standard, ensuring safety from the source of materials. The reactants are accurately proportioned to maintain the pH between 6.5 - 7.5, and the temperature control layer stabilizes the water temperature at 40℃ - 50℃, eliminating reaction risks.

[0028] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Description of the Drawings

[0029] The above-mentioned and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of the embodiments in conjunction with the drawings, wherein:

[0030] Figure 1 is a perspective view of a hot water capsule structure according to an embodiment of the present application;

[0031] Figure 2 is a schematic structural view of a hot water capsule structure according to an embodiment of the present application;

[0032] Figure 3 is an exploded view of the reaction process of a hot water capsule structure according to an embodiment of the present application;

[0033] Figure 4 is a flow chart of the capsule structure design of a hot water capsule structure according to an embodiment of the present application;

[0034] Figure 5 is a flow chart of reaction triggering and heating of a hot water capsule structure according to an embodiment of the present application;

[0035] Figure 6 is a flow chart of mineral supplementation of a hot water capsule structure according to an embodiment of the present application;

[0036] Figure 7 is a flow chart of safety and environmental protection of a hot water capsule structure according to an embodiment of the present application;

[0037] Figure 8 is a flow chart of user operation of a hot water capsule structure according to an embodiment of the present application.

[0038] As shown in the figure: 1. Outer layer; 2. Inner layer; 3. Temperature control layer; 4. Visual indication layer. Detailed Description of the Embodiments

[0039] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and should not be construed as limiting the present application. On the contrary, the embodiments of the present application include all changes, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0040] The following describes a hot water capsule structure according to an embodiment of the present application in conjunction with the drawings.

[0041] As shown Figures 1 - 8 in the figure, a hot water capsule structure according to an embodiment of the present application may include an outer layer 1, an inner layer 2, a temperature control layer 3, and a visual indication layer 4.

[0042] It can be understood that, first of all, the outer layer 1 is made of a water-soluble polymer material, such as pullulan or HPMC. During actual use, when the hot water capsule is put into water, the outer layer 1 begins to dissolve due to contact with water. Since it wraps the inner layer 2 and the temperature control layer 3, as the outer layer 1 rapidly dissolves within 20 - 30 seconds, the internal structure is exposed, thus triggering subsequent reactions.

[0043] The inner layer 2 contains a mixture of calcium oxide and citric acid accurately proportioned by a mass ratio of 3:1. When the outer layer 1 dissolves, the calcium oxide and citric acid in the inner layer 2 come into contact with water. Calcium oxide (CaO) rapidly undergoes a chemical reaction with water

[0044]

[0045] At the same time, citric acid undergoes a neutralization reaction with the generated calcium hydroxide

[0046] Ca(OH)2 + 2C6H8O7 → Ca(C6H7O7)2 + 2H2O

[0047] Thereby maintaining the pH value of the solution between 6.5 - 7.5.

[0048] The temperature control layer 3 is a porous heat-insulating material layer that wraps the inner layer 2 and is composed of vermiculite or diatomite materials. During the process of the reaction between calcium oxide and water to generate heat, the temperature control layer 3 plays an important role. It surrounds the outer layer of calcium oxide in the inner layer 2, slows down the reaction rate between calcium oxide and water, enables the heat generated by the reaction to be released relatively smoothly, and then stably controls the water temperature between 40°C - 50°C to avoid the water temperature being too high.

[0049] The visual indication layer 4 is arranged on the outer surface of the outer layer 1 and is a temperature-sensitive color-changing ink. As the heating process of the hot water capsule for drinking water progresses, when the water temperature reaches the safe drinking range, the temperature-sensitive color-changing ink of the visual indication layer 4 changes from the initial blue to white. Through this intuitive color change, it provides a clear water temperature prompt to the user, informing the user that the drinking water has reached the safe drinking state.

[0050] In an embodiment of the present application, as Figures 1 - 8As shown, the optional mineral fortifying additive includes trace amounts of food-grade magnesium sulfate (MgSO4), and chelate forms of zinc and selenium trace elements may be selectively added. The mineral fortifying additive is encapsulated within the inner layer 2 together with calcium oxide (CaO) powder and solid citric acid in the inner layer 2, and uses the heat released by the reaction to accelerate its own dissolution to achieve mineral fortification supplementation of drinking water, where the calcium ion concentration is controlled at ≤50 mg / L, meeting the drinking water standard.

[0051] It can be understood that when making the hot water capsule, the optional mineral fortifying additive is encapsulated within the inner layer 2 together with calcium oxide (CaO) powder and solid citric acid in the inner layer 2. These mineral fortifying additives contain trace amounts of food-grade magnesium sulfate (MgSO4), and chelate forms of zinc and selenium trace elements can be selectively added according to actual needs.

[0052] When the user puts the hot water capsule into water, the outer layer 1 dissolves, triggering the reaction of the substances in the inner layer 2. Calcium oxide (CaO) reacts with water to release a large amount of heat. At the same time, citric acid reacts with the generated calcium hydroxide in a neutralization reaction. During this process, the mineral fortifying additive encapsulated within the inner layer 2 accelerates its own dissolution by means of the heat released by the reaction. Food-grade magnesium sulfate (MgSO4) releases magnesium ions (Mg 2+ ) after dissolution, and together with the calcium ions generated by the reaction, it achieves dual supplementation of calcium and magnesium in drinking water. The added chelate forms of zinc and selenium trace elements also dissolve under the action of heat, releasing the corresponding zinc and selenium trace elements, further enhancing the nutritional value of drinking water.

[0053] During the entire reaction process, the calcium ion concentration is strictly controlled to always remain at ≤50 mg / L, meeting the drinking water standard. Through such a design, while increasing the water temperature, mineral fortification supplementation of drinking water is achieved, providing a healthier drinking experience for users.

[0054] In an embodiment of the present application, as Figures 1 - 8 shown, the visual indication layer 4 is a temperature-sensitive color-changing ink provided on the surface of the outer layer 1. When the hot water capsule completes the heating process of drinking water and the water temperature reaches the safe drinking range, the temperature-sensitive color-changing ink changes from the initial blue to white, thus providing a visual prompt to the user.

[0055] It is understandable that the visual indication layer 4 is provided on the surface of the outer layer 1, and its material is thermochromic ink. When the user puts the hot water capsule into water, the entire heating process is immediately started. The outer layer 1 is made of a water-soluble polymer material, which quickly contacts water and dissolves within 20 to 30 seconds, thereby triggering a series of reactions of calcium oxide (CaO), citric acid, and mineral fortifying additives in the inner layer 2. The reaction of calcium oxide (CaO) with water releases a large amount of heat, and the temperature control layer 3 slows down the reaction rate to ensure that the water temperature steadily rises to the safe drinking range of 40°C to 50°C.

[0056] As the water temperature gradually rises and reaches the safe drinking range, the thermochromic ink of the visual indication layer 4 undergoes a physical change due to the sensed water temperature change. The ink gradually changes from the initial blue to white, and this obvious color change intuitively conveys to the user the information that the hot water capsule has completed the heating process of the drinking water and the water temperature is in a safe drinking state. By observing the color of the visual indication layer 4 on the surface of the outer layer 1, the user can easily determine whether the drinking water has been heated to a suitable drinking temperature without the need for additional tools, greatly improving the convenience and safety of the user using the hot water capsule.

[0057] In an embodiment of the present application, as Figures 1 - 8 shown, the overall size design of the hot water capsule meets the requirements of diameter ≤ 2 cm and weight < 10 g to fit the standard mineral water bottle mouth, facilitating the user to directly put it into the bottle for use and being convenient for the user to carry around.

[0058] It is understandable that from the production perspective, when manufacturing the outer layer 1, a water-soluble polymer material with an appropriate thickness, such as pullulan or HPMC, is selected to ensure that while covering the inner layer 2 and the temperature control layer 3, the diameter and weight of the capsule will not be overly increased. When encapsulating calcium oxide (CaO) powder, solid citric acid, and mineral fortifying additives in the inner layer 2, the volume and weight are controlled through precise proportioning and reasonable encapsulation processes. The temperature control layer 3 selects lightweight and good heat-insulating materials such as vermiculite or diatomaceous earth to surround the calcium oxide (CaO) powder in the inner layer 2 in a thin layer, so as to play a temperature control role without causing the overall size and weight of the capsule to exceed the standard. The visual indication layer 4 is printed on the surface of the outer layer 1 with an extremely thin thermochromic ink, hardly adding extra size and weight.

[0059] In actual use scenarios, when a user is about to use a hot water capsule, since its diameter ≤ 2 cm, it can easily fit the mouth of a standard mineral water bottle, and the hot water capsule can be directly put into the bottle. The user doesn't need to look for other special containers or make any modifications to the mineral water bottle, and can conveniently start the heating process. At the same time, the design with a weight < 10 g enables the user to easily put the hot water capsule into a pocket, a small pocket of a backpack, or a small carry-on bag. Whether in daily travel, outdoor hiking, business trips, or other scenarios, it can be conveniently carried around, meeting the need for heating drinking water at any time and greatly enhancing the practicality of the product and the user experience.

[0060] In an embodiment of the present application, as Figures 1 - 8 shown, the material used for the outer layer 1 has passed the FDA food contact material certification, ensuring no risk of plasticizer migration. The food-grade calcium oxide has a purity ≥ 99%, meeting the GB25572-2010 standard. After the reaction, residual substances such as calcium citrate and undissolved vermiculite can be naturally degraded into harmless substances and have no harm to the environment after being discarded with the bottle.

[0061] It can be understood that when the user uses the hot water capsule, the outer layer 1 dissolves, and the substances inside the inner layer 2 react, and the temperature control layer 3 works together to complete the process of heating drinking water and strengthening the supplement of minerals. After the reaction, the residual substances are mainly calcium citrate and undissolved vermiculite, etc. Calcium citrate, as a product of the reaction, and undissolved vermiculite can both be naturally degraded into harmless substances. After the user finishes using it, these residual substances can be directly discarded together with the mineral water bottle. In the natural environment, the residual substances will gradually decompose and will not cause pollution to the soil, water source, etc., truly realizing green environmental protection throughout the entire process from production to use and then to treatment.

[0062] Specifically, during the actual implementation process, the user holds the hot water capsule. The outer layer 1 is made of a water-soluble polymer material (such as pullulan or HPMC) that has passed the FDA food contact material certification, with a thin and light touch. The user puts the hot water capsule into a standard mineral water bottle filled with drinking water. At this time, the outer layer 1 quickly comes into contact with water and starts to dissolve. Within 20 - 30 seconds, the outer layer 1 is completely dissolved, and the originally wrapped inner layer 2 and temperature control layer 3 are exposed.

[0063] The inner layer 2 contains a mixture of calcium oxide and citric acid precisely proportioned by mass ratio of 3:1, as well as optional mineral strengthening additives (trace food-grade magnesium sulfate (MgSO4), and may also contain chelate forms of trace elements such as zinc and selenium). As the outer layer 1 finishes dissolving, the calcium oxide (CaO) in the inner layer 2 quickly reacts with water

[0064]

[0065] Meanwhile, citric acid undergoes a neutralization reaction with the generated calcium hydroxide

[0066] Ca(OH)2 + 2C6H8O7 → Ca(C6H7O7)2 + 2H2O

[0067] Thereby maintaining the pH value of the solution between 6.5 - 7.5. During this process, the mineral fortifying additive accelerates its own dissolution by means of the heat released from the reaction. Food-grade magnesium sulfate (MgSO4) releases magnesium ions (Mg 2+ ), together with the calcium ions generated by the reaction, realizes the dual supplementation of calcium and magnesium in the drinking water. Chelate forms of trace elements such as zinc and selenium also release the corresponding trace elements, enhancing the nutritional value of the drinking water. And the calcium ion concentration is always controlled at ≤50mg / L, meeting the drinking water standard.

[0068] The temperature control layer 3 is composed of vermiculite or diatomaceous earth materials and surrounds and wraps the outer layer of calcium oxide in the inner layer 2. During the process of the reaction between calcium oxide and water generating heat, the temperature control layer 3 plays an important role in slowing down the reaction rate between calcium oxide and water, enabling the heat generated by the reaction to be released more smoothly, and then stably controlling the water temperature between 40°C - 50°C to avoid the water temperature being too high.

[0069] As the heating process progresses, when the water temperature reaches the range where it can be safely consumed, the visual indication layer 4 provided on the outer surface of the outer layer 1 comes into play. The visual indication layer 4 is a temperature-sensitive color-changing ink. Due to sensing the change in water temperature, it changes from the initial blue to white, intuitively prompting the user that the drinking water has reached the state where it can be safely consumed. By observing the color change of the visual indication layer 4 on the surface of the outer layer 1, the user can easily determine whether the drinking water has been heated to a suitable drinking temperature without the need for additional tools. After the user finishes drinking, the reaction ends, and residual substances such as calcium citrate and undissolved vermiculite can be naturally degraded into harmless substances. The user can directly discard these residual substances together with the mineral water bottle. In the natural environment, the residual substances will gradually decompose and will not cause pollution to the soil, water source, etc., completing the green environmental protection of the entire process from production to use and then to treatment.

[0070] In summary, a hot water capsule structure according to an embodiment of the present application does not require an external power supply, has a diameter ≤2 cm and a weight <10 g. It can be heated by simply dropping the capsule into water, is simple and portable, dissolves quickly in 20 - 30 seconds, can efficiently heat and supplement trace elements such as calcium and magnesium, the temperature-sensitive ink indicates the water temperature, the materials are FDA-certified, the temperature is precisely controlled to eliminate risks, and the reaction residues can be naturally degraded, practicing green environmental protection.

[0071] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0072] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0073] Although the embodiments of this application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting this application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A hot water capsule structure, characterized in that: It comprises an outer layer (1), an inner layer (2), a temperature control layer (3) and a visual indication layer (4), wherein: The outer layer (1) is made of a water-soluble polymer material and wraps the inner layer (2) and the temperature control layer (3); The inner layer (2) comprises a mixture of calcium oxide and citric acid in a mass ratio of 3:1; The temperature control layer (3) is a porous heat-insulating material layer that wraps the inner layer (2); The visual indication layer (4) is arranged on the outer surface of the outer layer (1).

2. A hot water capsule structure according to claim 1, characterized in that: The water-soluble polymer material is pullulan or HPMC, and the outer layer (1) completely wraps the inner layer (2) and dissolves rapidly within 20 to 30 seconds after contact with water, thereby triggering a reaction of the internal substances; Calcium oxide (CaO) powder and solid citric acid are uniformly mixed and then wrapped by the inner layer (2), and the inner layer (2) is located in the inner space of the outer layer (1); The temperature control layer (3) surrounds the outer layer of calcium oxide (CaO) powder wrapped in the inner layer (2) and is made of vermiculite or diatomaceous earth material, which slows down the reaction rate of calcium oxide and water and stably controls the water temperature between 40°C and 50°C.

3. A hot water capsule structure according to claim 1, characterized in that: Optional mineral fortification additives include trace amounts of food-grade magnesium sulfate (MgSO4), and optionally zinc and selenium trace elements in the form of chelates. The mineral fortification additives are encapsulated in the inner layer (2) together with the calcium oxide (CaO) powder and solid citric acid in the inner layer (2), and the heat released by the reaction is used to accelerate their own dissolution to achieve mineral fortification supplementation of drinking water, wherein the calcium ion concentration is controlled at ≤50 mg / L, which meets the drinking water standards.

4. A hot water capsule structure according to claim 1, characterized in that: The visual indication layer (4) is a temperature-sensitive color-changing ink arranged on the surface of the outer layer (1). When the hot water capsule completes the heating process of the drinking water and the water temperature reaches a safe drinking range, the temperature-sensitive color-changing ink changes from the initial blue to white, thereby providing a visual prompt to the user.

5. A hot water capsule structure according to claim 1, characterized in that: The overall size of the hot water capsule is designed to meet the requirements of diameter ≤2cm and weight <10g, so as to fit the mouth of a standard mineral water bottle, so that the user can directly put it into the bottle for use and it is convenient for the user to carry it with them.

6. A hot water capsule structure according to claim 1, characterized in that: The material used for the outer layer (1) has passed the FDA food contact material certification to ensure that there is no risk of plasticizer migration. The purity of food-grade calcium oxide is ≥99%, which complies with the GB25572-2010 standard. After the reaction is completed, the residual calcium citrate and undissolved vermiculite and other substances can be naturally degraded into harmless substances and will not harm the environment after being discarded with the bottle.

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