Hydrogel-based low-temperature high-steam self-heating eyeshade and preparation method thereof

Abstract

The invention discloses a hydrogel-based low-temperature high-steam self-heating eyeshade and a preparation method thereof, and belongs to the technical field of personal care supplies, and the self-heating eyeshade sequentially comprises a breathable outer layer, a self-heating body and a composite dressing from outside to inside. The composite dressing is formed by tightly attaching a hydrogel functional layer and a supporting layer. According to the self-heating eyeshade, through the collaborative design of all the functional layers, the composite dressing is arranged between the self-heating body and the skin, so that heat preferentially drives hydrogel moisture to evaporate; meanwhile, the hydrogel three-dimensional network structure provides a huge specific surface area, the low-temperature evaporation efficiency is effectively improved, and steam explosion is avoided and stable and continuous output is achieved by regulating release kinetics through bound moisture. The working temperature of the self-heating eyeshade is stably maintained within the range of 37-45 DEG C, the steam quantity can be 2-2.4 times that of a traditional product under the low-temperature condition, and the self-heating eyeshade has remarkable advantages in key performance such as safety, comfort, steam durability and steam quantity.

Description

Technical Field

[0001] This invention relates to the field of personal care products technology, specifically to a hydrogel-based low-temperature high-steam self-heating eye mask and its preparation method. Background Technology

[0002] With the fast pace of modern life, problems such as excessive eye strain, visual fatigue, and dry eye syndrome are becoming increasingly common. Warm compresses, as an effective relief method, can improve dryness and fatigue by promoting blood circulation around the eyes and relaxing eye muscles. However, existing warm compress products have significant shortcomings in terms of temperature control, steam persistence, and safety, necessitating the development of more optimized solutions to meet user needs.

[0003] Currently, self-heating eye masks are widely used heat therapy products. Their core heating element typically consists of iron powder, activated carbon, vermiculite, water, absorbent resin, and salt, releasing heat through the oxidation reaction of the iron powder (the corrosion process of iron). While these eye masks have some effectiveness, they still suffer from the following key drawbacks: The contradiction between temperature and steam volume: In order to generate enough steam, traditional eye masks need to maintain a high reaction temperature (often exceeding 45°C or even 50°C), but high temperature can easily cause burns to the delicate skin around the eyes, making it difficult to balance safety and user experience.

[0004] Insufficient steam volume and short duration: The steam relies on high temperature to evaporate the limited free water inside the eye mask. Once the moisture is exhausted or the temperature drops, the steam sensation disappears quickly, making it impossible to achieve a lasting warm and moisturizing effect.

[0005] Poor temperature control performance: After the iron powder oxidation reaction starts, the heating rate and the maximum temperature are difficult to control precisely, resulting in large temperature fluctuations and an inability to maintain a stable low temperature range (such as 37-45℃). Summary of the Invention

[0006] Therefore, the present invention provides a low-temperature, high-steam self-heating eye mask based on hydrogel and its preparation method, in order to solve the problems of insufficient steam volume, short steam duration and potential skin burns caused by high temperature in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: According to a first aspect of the present invention, a hydrogel-based low-temperature, high-steam self-heating eye mask is provided, comprising, from the outside to the inside, a breathable outer layer, a self-heating element, and a composite dressing. The composite dressing is formed by tightly bonding a hydrogel functional layer and a support layer, wherein the hydrogel functional layer and the support layer are tightly bonded by a coating method, the coating method including scraping, and the support layer is formed by bonding or hot pressing. The water content of the composite dressing is 40% to 80%.

[0008] Furthermore, the hydrogel functional layer is made from the following raw materials in parts by weight: 3-7 parts hydrophilic polymer gel, 40-80 parts water, 0.1-0.4 parts crosslinking agent and 15-30 parts glycerol.

[0009] Furthermore, the hydrophilic polymeric gel is selected from one or more of sodium polyacrylate, polyacrylamide, polyvinyl alcohol, agar, carrageenan, or gelatin.

[0010] Furthermore, the self-heating element is encapsulated by two thin films or composite films, and the interior is filled with a self-heating composition, wherein at least one film is permeable to air, with a permeability of 10,000-40,000 cm³. 3 / (cm) 2 •s), to allow air to enter and water vapor to exit.

[0011] Furthermore, the film is a single-material film or a multi-layer composite film, and the material of the film is selected from one or more of PE, PP, PTFE, PA and BOPP; the self-heating composition is a powder mixture or a paste mixture.

[0012] Furthermore, the self-heating composition is a powder mixture made from the following raw materials in parts by weight: 40-60 parts iron powder, 5-10 parts activated carbon, 5-15 parts vermiculite, 1.5-4 parts sodium chloride, 1-3 parts water-absorbing resin and 20-40 parts water.

[0013] Furthermore, the breathable outer layer is selected from one or more of breathable nonwoven fabric or hot air cotton; the support layer is selected from one or more of water-repellent fabric or hot air cotton.

[0014] According to a second aspect of the present invention, a method for preparing a hydrogel-based low-temperature high-vapor self-heating eye mask is provided, comprising the following steps: S1. Preparation of self-heating body: Iron powder, activated carbon, vermiculite, sodium chloride, water-absorbing resin and water are mixed evenly, and encapsulated with two layers of thin film or composite film, with at least one side of the film being breathable, to form a self-heating body; S2. Preparation of composite dressing: Mix hydrophilic polymer material, water, glycerin and crosslinking agent evenly to form hydrogel prepolymer, coat it on the support layer, cover the other side with peelable pearl film and roll it up to form composite dressing. S3. Making the eye mask: The breathable outer layer, the self-heating body and the composite dressing are layered in sequence, and the perimeter is sealed by hot pressing or ultrasonic welding to make the eye mask.

[0015] Further, the layering method described in step S3 is as follows: First, place the self-heating body on the inner side of the breathable outer layer, spray adhesive around its perimeter, and then attach the hydrogel prepolymer side of the composite dressing to the inner side of the self-heating body so that the heat is preferentially conducted to the hydrogel functional layer for moisture evaporation; at the same time, peel off and roll up the pearl film on the composite dressing.

[0016] The present invention has the following advantages: This application provides a hydrogel-based low-temperature, high-steam self-heating eye mask. Its core lies in the organic combination of traditional self-heating agents (such as iron powder and activated carbon) with a hydrophilic polymer hydrogel through a multi-layered composite structure. This multi-layered composite structure achieves synergistic effects through a specific sequence and material arrangement of the functional layers, which is key to achieving the low-temperature, high-steam effect. If the hydrogel functional layer is placed between the self-heating agent and the air, it will not only hinder the reaction between the self-heating agent and oxygen but also cause ineffective heat loss into the air, failing to efficiently drive the gel to generate steam.

[0017] This self-heating eye mask utilizes the unique "water storage-vapor release" properties of hydrogel to achieve continuous and efficient evaporation of moisture under low-temperature conditions, resulting in the following beneficial effects: (1) Suitable temperature control, safe and comfortable use: The product's working temperature can be stably maintained within the range of 37-45℃, which meets the comfortable temperature requirements of the human body when using it, effectively reducing the risk of burns, especially suitable for sensitive areas such as the eye area and face; at the same time, the thermal buffering properties of hydrogel help to avoid local overheating and improve the safety of long-term use.

[0018] (2) Significantly increased steam output and improved moist heat effect: This is due to the unique synergistic mechanism of "nanoreactors" and "zero-distance vaporization" inside the hydrogel: its three-dimensional network structure forms countless "nanoreactors" and binds water molecules into an ultra-thin water film at the nanoscale. This structure can efficiently localize the heat generated by the exothermic reaction within the "nanoreactors" to avoid heat loss; at the same time, the concentrated heat can directly act on the interfacial water molecules, greatly reducing the phase transition activation energy and driving the water molecules to vaporize instantaneously and efficiently at low temperatures. Based on this synergistic mechanism, the steam output of this self-heating eye mask can reach 2-2.4 times that of traditional products in the low-temperature working range of 37-45℃, which not only significantly enhances the moist heat therapy effect, but also achieves more continuous and uniform steam release characteristics.

[0019] (3) More sustained steam release and better thermal and humidity stability: The hydrogel, as a water storage unit, achieves automatic and continuous replenishment of water from the inside to the vaporization interface through its hydrophilicity and capillary action, forming a stable cycle of "vaporization-replenishment-revaporization". This process ensures that limited heat energy is concentrated at the interface phase change rather than heating the entire water body, thereby efficiently converting energy into steam kinetic energy. The system is like an integrated set of countless micron-sized "steam nozzles", which can still achieve instantaneous and continuous steam output under low temperature conditions. This mechanism effectively improves the problems of initial steam burst and insufficient steam in the later stage that are common in traditional products. Combined with the synergistic regulation of the self-heating element, it effectively improves the overall stability of temperature and humidity output, thereby extending the effective treatment time.

[0020] (4) Strong structural adaptability and easy to scale up production: The multi-layer composite structure design is compatible with roll-to-roll continuous production process, which helps to reduce manufacturing costs and improve production efficiency; at the same time, the materials for preparing the self-heating eye mask are readily available and the process is simple, which has good potential for large-scale application.

[0021] Compared with traditional self-heating products, the self-heating eye mask of this invention has achieved superior performance in terms of safety, comfort, steam output and durability through dual optimization of materials and structure, and is suitable for scenarios with high demand for heat and moisture therapy, such as medical care and beauty health care. Attached Figure Description

[0022] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0023] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0024] Figure 1 This is a line graph showing the highest temperature of the self-heating eye mask sample in Embodiment 1 of the present invention, where the horizontal axis represents the sample number and the vertical axis represents the highest temperature (unit: °C). Figure 2 This is a line graph showing the highest temperature of the self-heating eye mask sample in Embodiment 2 of the present invention, where the horizontal axis represents the sample number and the vertical axis represents the highest temperature (unit: °C). Figure 3 This is a line graph showing the highest temperature of the self-heating eye mask sample in Embodiment 3 of the present invention, where the horizontal axis represents the sample number and the vertical axis represents the highest temperature (unit: °C). Figure 4 This is a line graph showing the highest temperature of the self-heating eye mask sample in the comparative examples of this invention, where the horizontal axis represents the sample number and the vertical axis represents the highest temperature (unit: °C). Figure 5 This is a comparison chart of the highest average temperature of the self-heating eye mask samples in Examples 1-3 and Comparative Examples of the present invention. The horizontal axis represents the group, and the vertical axis represents the highest average temperature (unit: °C). Figure 6 This is a line graph showing the steam volume of the self-heating eye mask sample in Example 1 of the present invention, where the horizontal axis represents the sample number and the vertical axis represents the steam volume (unit: mg / g). Figure 7 This is a line graph showing the steam volume of the self-heating eye mask sample in Example 2 of the present invention, where the horizontal axis represents the sample number and the vertical axis represents the steam volume (unit: mg / g). Figure 8 This is a line graph showing the steam volume of the self-heating eye mask sample in Example 3 of the present invention, where the horizontal axis represents the sample number and the vertical axis represents the steam volume (unit: mg / g). Figure 9 This is a line graph showing the steam volume of the self-heating eye mask sample in the comparative example of the present invention, where the horizontal axis represents the sample number and the vertical axis represents the steam volume (unit: mg / g). Figure 10 This is a comparison chart of the average steam volume of the self-heating eye mask samples in Examples 1-3 and the comparative examples of the present invention. The horizontal axis represents the group, and the vertical axis represents the average steam volume (unit: mg / g). Detailed Implementation

[0025] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] According to a first aspect of the present invention, a low-temperature, high-steam self-heating eye mask based on hydrogel is provided, comprising, from the outside to the inside, a breathable outer layer, a self-heating body, and a composite dressing. The composite dressing is formed by tightly bonding a hydrogel functional layer and a support layer. The hydrogel functional layer and the support layer are tightly bonded by a coating method, including scraping. The support layer is formed by bonding or hot pressing. The water content of the composite dressing is 40% to 80%.

[0027] Furthermore, the hydrogel functional layer is made from the following raw materials in parts by weight: 3-7 parts hydrophilic polymer gel, 40-80 parts water, 0.1-0.4 parts crosslinking agent and 15-30 parts glycerol.

[0028] Furthermore, the hydrophilic polymeric gel is selected from one or more of sodium polyacrylate, polyacrylamide, polyvinyl alcohol, agar, carrageenan, or gelatin.

[0029] Furthermore, the self-heating element is encapsulated by two thin films or composite films, and the interior is filled with a self-heating composition, wherein at least one of the films is permeable to air, with a permeability of 10,000-40,000 cm³. 3 / (cm) 2 •s), to allow air to enter and water vapor to exit.

[0030] Furthermore, the film is a single-material film or a multi-layer composite film, and the material of the film is selected from one or more of PE, PP, PTFE, PA and BOPP; the self-heating composition is a powder mixture or a paste mixture.

[0031] Furthermore, the self-heating composition is a powder mixture made from the following raw materials in parts by weight: 40-60 parts iron powder, 5-10 parts activated carbon, 5-15 parts vermiculite, 1.5-4 parts sodium chloride, 1-3 parts water-absorbing resin and 20-40 parts water.

[0032] Furthermore, the breathable outer layer is selected from one or more of breathable nonwoven fabric or hot air cotton; the support layer is selected from one or more of water-repellent fabric or hot air cotton.

[0033] According to a second aspect of the present invention, a method for preparing a hydrogel-based low-temperature high-vapor self-heating eye mask is provided, comprising the following steps: S1. Preparation of self-heating body: Iron powder, activated carbon, vermiculite, sodium chloride, water-absorbing resin and water are mixed evenly, and encapsulated with two layers of thin film or composite film, with at least one side of the film being breathable, to form a self-heating body; S2. Preparation of composite dressing: Mix hydrophilic polymer material, water, glycerin and crosslinking agent evenly to form hydrogel prepolymer, coat it on the support layer, cover the other side with peelable pearl film and roll it up to form composite dressing. S3. Making the eye mask: The breathable outer layer, the self-heating body and the composite dressing are layered in sequence, and the perimeter is sealed by hot pressing or ultrasonic welding to make the eye mask.

[0034] Further, the layering method in step S3 is as follows: first, place the self-heating body on the inside of the breathable outer layer, spray adhesive around its perimeter, and then attach the hydrogel prepolymer side of the composite dressing to the inside of the self-heating body so that the heat is preferentially conducted to the hydrogel functional layer for moisture evaporation; at the same time, peel off and roll up the pearlescent film on the composite dressing.

[0035] Example 1 A method for preparing a hydrogel-based low-temperature, high-vapor self-heating eye mask includes the following steps: (1) Preparation of self-heating body: Weigh 50 parts iron powder, 7.5 parts activated carbon, 12 parts vermiculite, 3 parts sodium chloride, 2 parts water-absorbing resin and 30 parts water by weight, mix them evenly, and place them on two layers of breathable non-woven fabric (breathability is 20000 cm³). 3 / (cm) 2 Between the two sides, and sealed by hot pressing, a self-heating body is formed; (2) Preparation of composite dressing: Weigh 7 parts sodium polyacrylate, 80 parts water, 0.4 parts crosslinking agent and 30 parts glycerin by weight, mix them evenly to form a hydrogel prepolymer (water content is 68.14%); coat the hydrogel prepolymer onto the water-repellent cloth and hot air cotton composite cloth (made by hot pressing) by scraping, cover the other side with a peelable pearl film and roll it up to form a composite dressing; (3) Making eye mask: First, place the self-heating body in step (1) on the inside of the breathable outer layer, spray glue around its perimeter, then attach the hydrogel prepolymer side of the composite dressing in step (2) to the inside of the self-heating body, peel off and roll up the pearl film on the composite dressing, and seal the perimeter by hot pressing to obtain a self-heating eye mask sample.

[0036] Example 2 A method for preparing a hydrogel-based low-temperature, high-vapor self-heating eye mask includes the following steps: (1) Preparation of self-heating body: Weigh 50 parts iron powder, 7.5 parts activated carbon, 12 parts vermiculite, 3 parts sodium chloride, 2 parts water-absorbing resin and 30 parts water by weight, mix them evenly, and place them on two layers of breathable non-woven fabric (breathability is 20000 cm³). 3 / (cm) 2 Between the two sides, and sealed by hot pressing, a self-heating body is formed; (2) Preparation of composite dressing: Weigh 7 parts sodium polyacrylate, 40 parts water, 0.4 parts crosslinking agent and 30 parts glycerin by weight, mix them evenly to form a hydrogel prepolymer (water content is 51.7%); coat the hydrogel prepolymer onto the water-repellent cloth and hot air cotton composite cloth (made by adhesive method) by scraping, cover the other side with a peelable pearl film and roll it up to form a composite dressing; (3) Making eye mask: First, place the self-heating body in step (1) on the inside of the breathable outer layer, spray glue around its perimeter, then attach the hydrogel prepolymer side of the composite dressing in step (2) to the inside of the self-heating body, peel off and roll up the pearl film on the composite dressing, and seal the perimeter by hot pressing to obtain a self-heating eye mask sample.

[0037] Example 3 A method for preparing a hydrogel-based low-temperature, high-vapor self-heating eye mask includes the following steps: (1) Preparation of self-heating element: Weigh 50 parts by weight of iron powder, 7.5 parts by weight of activated carbon, 12 parts by weight of vermiculite, 3 parts by weight of sodium chloride and 30 parts by weight of water, mix them evenly, and then coat them onto a breathable non-woven fabric (breathability of 20000 cm³) by scraping. 3 / (cm) 2 Sprinkle 2 parts of water-absorbing resin evenly on the surface, cover with an airtight film, and heat-seal the edges to form a self-heating body; (2) Preparation of composite dressing: Weigh 7 parts sodium polyacrylate, 80 parts water, 0.4 parts crosslinking agent and 30 parts glycerin by weight, mix them evenly to form a hydrogel prepolymer (water content is 68.14%); coat the hydrogel prepolymer onto the water-repellent cloth and hot air cotton composite cloth (made by hot pressing) by scraping, cover the other side with a peelable pearl film and roll it up to form a composite dressing; (3) Making eye mask: First, place the self-heating body in step (1) on the inside of the breathable outer layer, spray glue around its perimeter, then attach the hydrogel prepolymer side of the composite dressing in step (2) to the inside of the self-heating body, peel off and roll up the pearl film on the composite dressing, and seal the perimeter by hot pressing to obtain a self-heating eye mask sample.

[0038] Comparative Example A method for preparing a traditional self-heating eye mask includes the following steps: (1) Preparation of self-heating body: Weigh 50 parts iron powder, 7.5 parts activated carbon, 12 parts vermiculite, 3 parts sodium chloride, 2 parts water-absorbing resin and 30 parts water by weight, mix them evenly, and then encapsulate them in a breathable non-woven fabric bag to form a self-heating body. (2) Making the eye mask: First, place the self-heating body from step (1) on the inside of the breathable outer layer, spray glue around its perimeter, and seal the perimeter by hot pressing to obtain a self-heating eye mask sample.

[0039] According to the requirements of industry standard FZ / T08007-2024 "Disposable Steam Eye Masks", the low-temperature, high-steam self-heating eye mask samples in Examples 1-3 and the conventional self-heating eye mask samples in the comparative examples were tested, and the results are as follows: Test Example 1 The highest surface temperature of the self-heating eye mask samples in Examples 1-3 and the comparative examples was recorded from the start to the end of heating on the side closest to the human eye. Sixteen parallel tests were set up for each group, and the results are as follows: Figure 1-5 As shown.

[0040] from Figure 1-4 As can be seen from the maximum temperatures of the self-heating goggle samples in Examples 1-3, the maximum temperatures of the self-heating goggle samples in Examples 1-3 are stable within the ranges of 37-41℃, 38-43℃, and 37-41℃, respectively, while the maximum temperature of the self-heating goggle sample in the comparative example reaches 46-54℃. It is worth noting that, compared to the self-heating goggle sample in Example 1, the self-heating goggle sample in Example 2 has a slightly lower average temperature due to its lower initial water content in the hydrogel, resulting in a slightly weaker heat buffering capacity.

[0041] from Figure 5 The average maximum temperature of the self-heating eye mask samples in Examples 1-3 and the comparative examples shows that the average maximum temperature of the low-temperature high-steam self-heating eye mask (Examples 1-3) is basically maintained at around 40°C, which is significantly lower than the average maximum temperature of the traditional self-heating eye mask (51°C). This result confirms that the hydrogel in the composite dressing can effectively avoid local overheating due to its thermal buffering properties, thereby accurately controlling the working temperature of the self-heating eye mask in the low-temperature comfort range of 37-45°C. This mechanism significantly improves the safety of the product during long-term use and fundamentally reduces the risk of burns.

[0042] Test Example 2 A steam collection and weighing device for a steam heating element, as described in patent CN109297574A, was used to test the steam volume. The steam volume of the self-heating eye mask samples in Examples 1-3 and the comparative example was recorded. Five parallel experiments were set up for each group. The results are as follows: Figure 6-10 As shown.

[0043] from Figure 6-9 The steam output of the self-heating eye mask samples in Examples 1-3 shows that the steam output of the self-heating eye mask samples in Examples 1-3 is within the ranges of 505.2-610.5 mg / g, 440.8-479.6 mg / g, and 517.4-551.5 mg / g, respectively, while the steam output of the self-heating eye mask sample in the comparative example is only in the range of 195.6-239.9 mg / g. The steam output of the self-heating eye mask sample in Example 2 is lower than that in Example 1, which is directly related to the lower water content of its hydrogel functional layer. This result is consistent with the temperature data in Test Example 1, jointly confirming that by adjusting the initial water content of the hydrogel, the working temperature and steam output of the self-heating eye mask of the present invention can be controlled.

[0044] Furthermore, comparing the structures of Example 1 and Example 3, it can be seen that Example 3 adopts a self-heating body structure with one-sided ventilation. By precisely controlling the oxygen entry rate to adjust the heating power, compared with the double-sided ventilation structure of Example 1, it helps to achieve a more stable heating process, thereby making the evaporation of moisture and the release of steam more continuous and stable.

[0045] from Figure 10 The average steam output of the self-heating eye mask samples in Examples 1-3 and the comparative examples shows that the average steam output of the low-temperature, high-steam self-heating eye masks (Examples 1-3) reaches 465.1-544.6 mg / g, which is 2-2.4 times (225.9 mg / g) of traditional self-heating eye masks. This significant improvement is due to the unique three-dimensional network microporous structure of the hydrogel in the composite dressing, which not only provides a large evaporation interface to accelerate steam generation, but also maximizes steam production at low temperatures (37-45℃) due to the low evaporation energy consumption characteristics of "bound water" and the efficient absorption and conversion of heat.

[0046] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A hydrogel-based low-temperature, high-steam self-heating eye mask, characterized in that, From the outside to the inside, it includes a breathable outer layer, a self-heating element, and a composite dressing. The composite dressing is made of a hydrogel functional layer and a support layer tightly bonded together. The water content of the composite dressing is 40% to 80%.

2. The hydrogel-based low-temperature high-steam self-heating eye mask as described in claim 1, characterized in that, The hydrogel functional layer is made of the following raw materials in parts by weight: 3-7 parts hydrophilic polymer gel, 40-80 parts water, 0.1-0.4 parts crosslinking agent and 15-30 parts glycerol; the hydrogel functional layer is located on the side of the self-heating body.

3. The hydrogel-based low-temperature, high-steam self-heating eye mask as described in claim 2, characterized in that, The hydrophilic polymeric gel is selected from one or more of sodium polyacrylate, polyacrylamide, polyvinyl alcohol, agar, carrageenan, or gelatin.

4. The hydrogel-based low-temperature high-steam self-heating eye mask as described in claim 1, characterized in that, The self-heating body is encapsulated by two thin films or composite films and filled with a self-heating composition, wherein at least one of the films is permeable to air.

5. The hydrogel-based low-temperature high-steam self-heating eye mask as described in claim 4, characterized in that, The film is a single-material film or a multi-layer composite film, and the material of the film is selected from one or more of PE, PP, PTFE, PA and BOPP; the self-heating composition is a powder mixture or a paste mixture.

6. The hydrogel-based low-temperature high-steam self-heating eye mask as described in claim 5, characterized in that, The self-heating composition is a powder mixture made from the following raw materials in parts by weight: 40-60 parts iron powder, 5-10 parts activated carbon, 5-15 parts vermiculite, 1.5-4 parts sodium chloride, 1-3 parts water-absorbing resin and 20-40 parts water.

7. The hydrogel-based low-temperature high-vapor self-heating eye mask as described in claim 1, characterized in that, The breathable outer layer is selected from one or more of breathable nonwoven fabric or hot air cotton; the support layer is selected from one or more of water-repellent fabric or hot air cotton.

8. A method for preparing a hydrogel-based low-temperature, high-steam self-heating eye mask, applicable to the hydrogel-based low-temperature, high-steam self-heating eye mask according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Preparation of self-heating body: Iron powder, activated carbon, vermiculite, sodium chloride, water-absorbing resin and water are mixed evenly, and encapsulated with two layers of thin film or composite film, with at least one side of the film being breathable, to form a self-heating body; S2. Preparation of composite dressing: Mix hydrophilic polymer material, water, glycerin and crosslinking agent evenly to form hydrogel prepolymer, coat it on the support layer, cover the other side with peelable pearl film and roll it up to form composite dressing. S3. Making the eye mask: The breathable outer layer, the self-heating body and the composite dressing are layered in sequence, and the perimeter is sealed by hot pressing or ultrasonic welding to make the eye mask.

9. The method for preparing a hydrogel-based low-temperature high-vapor self-heating eye mask as described in claim 8, characterized in that, The layering method described in step S3 is as follows: First, place the self-heating body on the inside of the breathable outer layer, spray adhesive around its perimeter, and then attach the hydrogel prepolymer side of the composite dressing to the inside of the self-heating body; at the same time, peel off and roll up the pearlescent film on the composite dressing.

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