Constant-temperature heating double-layer steam eyeshade and preparation method thereof

Abstract

This invention discloses a double-layered steam eye mask with constant temperature heating and its preparation method. The double-layered steam eye mask includes a steam eye mask body and an eye care layer. The eye care layer is bonded to the side of the steam eye mask that fits against the eyes. The steam eye mask body includes a first breathable layer and a second breathable layer, and a heating layer disposed between the first and second breathable layers. The heating layer is inverted figure-eight shaped. The heating layer includes several adhesive layers, with heating material disposed between adjacent adhesive layers. Fiber layers are disposed on the side of the heating layer closest to the first and second breathable layers. Beneficial effects: The heating layer uses an adhesive layer and heating material layered and sprayed layer by layer, effectively controlling the heating reaction of iron powder. By utilizing the temperature and water vapor transfer between layers, the eye mask temperature is better maintained, the steam time is extended, and a constant temperature heating effect is achieved.

Description

Technical Field

[0001] This invention relates to the field of steam eye mask technology, specifically to a constant-temperature heating double-layer steam eye mask and its preparation method. Background Technology

[0002] Steam eye masks use iron powder and fillers to create a heating element, which is placed inside the eye mask. The self-heating reaction between the iron powder and oxygen and moisture in the air controls the evaporation of moisture in the heating element, producing tiny, invisible warm steam that is maintained at a constant temperature of around 40°C. This helps to soften the skin and relieve fatigue, effectively improving eye fatigue and dryness caused by excessive use of electronic products.

[0003] Currently, steam eye masks suffer from short heating times and large fluctuations in constant temperature. Commercially available masks typically control the reaction of internal iron powder by regulating the oxygen permeability rate of the oxygen-permeable membrane, thereby controlling the steam temperature and duration. However, this method places high demands on the overall performance of the oxygen-permeable membrane and is difficult to control. Therefore, a simpler control method is needed. This invention starts from the structure of the heating element itself, controlling the distribution of iron powder within the heating element using an adhesive, thereby increasing the constant-temperature heating time of the eye mask. Furthermore, most eye masks suffer from problems such as instantaneous high temperatures causing eye discomfort; they cannot be used when there is eye inflammation, as this can cause allergic reactions; and the effects of eye masks are relatively limited. Therefore, developing a double-layered steam eye mask with diverse effects and controllable temperature and time for constant-temperature heating is an urgent problem to be solved. Summary of the Invention

[0004] The purpose of this invention is to provide a constant-temperature heating double-layer steam eye mask and its preparation method, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A constant-temperature heating double-layer steam eye mask, the double-layer steam eye mask includes a steam eye mask body and an eye care layer, as well as ear loops connected to both sides of the steam eye mask body; the eye care layer is bonded to the side of the steam eye mask body near the eyes. The steam eye mask body includes a first breathable layer and a second breathable layer, and a heating layer disposed between the first breathable layer and the second breathable layer; the heating layer is inverted figure-eight shaped; the heating layer includes several adhesive layers, with heating material disposed between adjacent adhesive layers, and fiber layers disposed on the side of the heating layer near the first breathable layer and the second breathable layer, respectively.

[0006] In this technical solution, an inverted figure-eight shaped heating layer is used to avoid the heating area of ​​the eyeball, effectively preventing eye burns. However, because the first and second breathable layers wrap around the heating layer, steam still acts on the eyelids above the eyeball, albeit at a lower temperature than around the eyeball. Furthermore, the heating layer is not manufactured by directly mixing the adhesive layer and the heating material as in common methods. Instead, it is applied layer by layer by spraying, effectively controlling the reaction process between the iron powder in the heating layer and oxygen and water in the air. This achieves the effect of controlling the reaction rate using an oxygen-permeable membrane, as is common in steam eye masks, reducing reliance on the breathable layer. By utilizing the transfer of temperature and water vapor between layers, the maximum temperature can be reduced, the steam time extended, and the effective temperature of the eye mask maintained, thus achieving constant-temperature heating. The inverted figure-eight design and ear-hook design better secure the eyes and prevent shifting, while the comfortable cut fits the eyes perfectly and provides comprehensive eye care.

[0007] In a more optimized manner, the heating material comprises the following materials by weight: 45-65 parts iron powder, 8-16 parts activated carbon, 0.1-0.45 parts mimosa hydrogel, 5-12 parts cassia seed powder, 2-3 parts diatomaceous earth, and 20-30 parts distilled water.

[0008] In this design, mimosa hydrogel serves as the superabsorbent polymer (SAP) in the heating material. This substance is prepared directly from mimosa without any added organic matter, making it a pure bio-based SAP that can effectively replace fossil-based resins, thus conserving fossil fuel resources. Furthermore, its macroporous structure effectively transports oxygen and moisture to the iron powder, and the adhesive layer facilitates cross-linking between the individual mimosa hydrogel particles within the heating material. Iron powder, activated carbon, cassia seeds, diatomaceous earth, and other powder particles are filled and fixed within this three-dimensional network. In addition, it exhibits significant antibacterial activity, effectively preventing inflammation caused by bacterial eye infections. Its pleasant fragrance has a calming and soothing effect, potentially treating neurasthenia and insomnia. The addition of cassia seeds helps to clear the liver and improve eyesight, working in conjunction with the mimosa hydrogel to alleviate eye inflammation.

[0009] Ideally, the adhesive layer is a linseed oil adhesive.

[0010] The solution uses linseed oil adhesive, a non-toxic, colorless, and odorless green substance. It is applied layer by layer, sprayed onto the adhesive surface, effectively fixing the heating layer material and preventing uneven distribution of the heating material, which could lead to localized overheating or sagging. It is not directly mixed with the heating material because the adhesive would fill the gaps between the materials, making the gaps too small, hindering water vapor transmission and causing expansion. The spraying method, layering by layer, increases the channels for water vapor and heat exchange, creating steam microcirculation, thereby effectively reducing the maximum temperature and increasing the constant-temperature heating performance. Furthermore, linseed oil itself, the raw material of the linseed oil adhesive, has components that protect the retina and can effectively protect vision; its introduction ensures no side effects.

[0011] Ideally, the thickness of the heating layer is 5.4~7mm; the thickness of the fiber layer is 2mm.

[0012] The thickness of the heating material is generally twice that of the adhesive layer, providing good fixation and water vapor transmission.

[0013] In a more optimized configuration, the first breathable layer consists of a microporous polyethylene membrane and a nonwoven fabric from top to bottom, with the nonwoven fabric in contact with the fiber layer; the second breathable layer consists of a nonwoven fabric and a high-grade medical nonwoven fabric from top to bottom, with the nonwoven fabric in contact with the fiber layer and the high-grade medical nonwoven fabric in contact with the eye care layer.

[0014] Ideally, the microporous polyethylene membrane has a pore size of 0.22~0.45μm; and the advanced medical nonwoven fabric has a pore size of 2~3μm.

[0015] Among them, the microporous polyethylene membrane is waterproof and can effectively prevent water vapor from evaporating upwards. Of course, since its pore size is 0.22~0.45μm, some water vapor will escape upwards. Therefore, in order to prevent water vapor from moving upwards, the pore size of the high-grade medical non-woven fabric set near the eye is 2~3μm. By using the difference in pore size, the downward movement of water vapor is increased.

[0016] In a more optimized manner, the eye care layer comprises hot-air nonwoven fabric, hesperidin plant extract, and violet plant extract.

[0017] The eye care layer is designed to work in conjunction with water vapor movement to effectively improve dark circles and the skin around the eyes. As the water vapor moves downwards, it carries hesperidin and violet extracts from the eye care layer into the skin around the eyes. Hesperidin extract has been proven effective in reducing allergies and can improve skin microcirculation, effectively removing dark circles. Violet extract has antioxidant properties and can effectively improve fine lines around the eyes. Hot air nonwoven fabric was chosen because it is skin-friendly, adheres well to the eye area without causing discomfort, and has large mesh pores that can adhere to the extracts and facilitate steam release.

[0018] A more optimized method for preparing a double-layered steam eye mask with constant temperature heating includes the following steps: S1: Preparation of Mimosa hydrogel: The mimosa plant was crushed and washed, soaked in deionized water for 10-20 hours, and then placed in a constant temperature shaker at 45-55℃ for 0.5-1.5 hours. The mixture was then poured into a microporous gauze bag for separation. The resulting hydrogel was placed in 80-100℃ to remove impurities, hot filtered, dried at 50-60℃, ground, and sieved to obtain a 250-300μm mimosa hydrogel. S2: Preparation of the heating layer: A. Under an inert gas environment, activated carbon, cassia seed powder, diatomaceous earth and distilled water are mixed evenly, iron powder and mimosa hydrogel are added, and the mixture is stirred evenly to obtain the heating material; B. In an inert gas environment, the fiber layer is laid flat on the template of the press, and linseed oil adhesive, heating material, linseed oil adhesive, heating material, linseed oil adhesive are sprayed layer by layer, and then the fiber layer is covered. It is rolled flat and densely dotted around the edges to obtain a heating layer of 5.4~7mm. S3: Preparation of double-layer steam eye mask: A. Preparation of the eye care layer: 10-20 wt% hesperidin plant extract and 5-8 wt% violet plant extract are electrostatically sprayed onto a hot air nonwoven fabric and dried with hot air in a countercurrent to obtain an eye care layer. B. Preparation of double-layer steam eye masks: A polyethylene film and a non-woven fabric are pressed together to form a first breathable layer; a non-woven fabric and a polymer are pressed together to form a second breathable layer; a heating layer is placed between the first and second breathable layers and pressed together to obtain the steam eye mask body; ear loops are connected on both sides; an eye care layer is bonded to obtain a double-layer steam eye mask, which is then sealed and stored.

[0019] Furthermore, the fragrance blend involves a mixed scent. As the constant-temperature heating reaction proceeds and water vapor is transferred, the fragrance release process is as follows: Top notes: Mimosa scent mixed with violet, fresh and elegant, soothing the nerves; Middle notes: the violet scent increases, adding a touch of soothing to the elegance; Base notes: the fruity scent of orange peel is added, adding a sweet fragrance, increasing intimacy within the soothing effect. The release of this fragrance contributes to relaxation.

[0020] Compared with the prior art, the beneficial effects achieved by the present invention are: (1) The heating layer adopts the method of layering and layering of adhesive layer and heating material, which effectively controls the heating reaction of iron powder, increases the mass transfer of temperature and water vapor between layers, better maintains the temperature of the eye mask, prolongs the steam time, and achieves the effect of constant temperature heating; (2) The inverted figure-eight heating layer avoids the heating part of the eyeball, effectively avoiding burning the eyeball, and the first and second breathable layers cover the eyeball, so that there is a small amount of steam effect at the eyeball position; (3) Pure plant hydrogel prepared by mimosa is used as a super absorbent polymer, and its porous structure effectively increases the gas transfer between iron powder; its antibacterial properties work synergistically with cassia seed to effectively inhibit the production of eye inflammation and reduce the inflammatory effect; (4) The added eye care layer uses the movement of water vapor to effectively apply the plant extracts in the eye care layer to the eye to remove dark circles; (5) The fragrance of mimosa hydrogel, hesperidin extract and violet extract in the steam eye mask is used to produce a rich fragrance during use, which soothes the nerves. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a diagram of the double-layer steam eye mask of the present invention; Figure 2 This is a side view of the double-layer steam eye mask of the present invention; In the diagram, 1 is the first breathable layer; 2 is the heating layer; 3 is the ear loop; 4 is the second breathable layer; 5 is the eye care layer; 21 is the fiber layer; 22 is the adhesive layer; and 23 is the heating material. Detailed Implementation

[0022] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0023] Please see Figures 1-2 The present invention provides the following embodiments. Example 1:

[0024] S1: Preparation of Mimosa hydrogel: The mimosa plant was crushed and washed, soaked in deionized water for 15 hours, placed in a constant temperature shaker at 50°C and shaken for 1 hour, poured into a microporous gauze bag for separation, the obtained hydrogel was placed in 90°C to remove impurities, hot filtered, dried at 55°C, ground, and sieved to obtain a 280μm mimosa hydrogel. S2: Preparation of heating layer 2: A. Under an inert gas environment, activated carbon, cassia seed powder, diatomaceous earth and distilled water are mixed evenly, iron powder and mimosa hydrogel are added, and the mixture is stirred evenly to form a heating material 23. B. In an inert gas environment, the fiber layer 21 is laid flat on the template of the press machine, and linseed oil adhesive, heating material 23, linseed oil adhesive, heating material 23, linseed oil adhesive, heating material 23, linseed oil adhesive, linseed oil adhesive, and then the fiber layer 21 is covered, and the press is rolled flat and densely dotted around the edges to obtain a 6.5mm heating layer 2. S3: Preparation of steam eye masks: A. Preparation of eye care layer 5: 12wt% hesperidin plant extract and 6wt% violet plant extract were electrostatically sprayed onto a hot air nonwoven fabric and dried with hot air countercurrent to obtain eye care layer 5. B. Preparation of steam eye masks: Polyethylene film and non-woven fabric are pressed together to form the first breathable layer 1; non-woven fabric and polymer are pressed together to form the second breathable layer 4; heating layer 2 is placed between the first breathable layer 1 and the second breathable layer 4, and pressed together to obtain the steam eye mask body; the two side loops 3 are connected; the eye care layer 5 is bonded to obtain the double-layer steam eye mask, which is then sealed and stored.

[0025] In this embodiment, the heating material 23 includes the following materials by weight: 55 parts iron powder, 14 parts activated carbon, 0.35 parts mimosa hydrogel, 10 parts cassia seed powder, 2.6 parts diatomaceous earth, and 25 parts distilled water. Example 2:

[0026] S1: Preparation of Mimosa hydrogel: The mimosa plant was crushed and washed, soaked in deionized water for 10 hours, placed in a constant temperature shaker at 45°C and shaken for 0.5 hours, poured into a microporous gauze bag for separation, the resulting hydrogel was placed in 80°C to remove impurities, hot filtered, dried at 50°C, ground, and sieved to obtain a 250μm mimosa hydrogel. S2: Preparation of heating layer 2: A. Under an inert gas environment, activated carbon, cassia seed powder, diatomaceous earth and distilled water are mixed evenly, iron powder and mimosa hydrogel are added, and the mixture is stirred evenly to form a heating material 23. B. In an inert gas environment, the fiber layer 21 is laid flat on the template of the press machine, and linseed oil adhesive, heating material 23, linseed oil adhesive, heating material 23, linseed oil adhesive, heating material 23, linseed oil adhesive, linseed oil adhesive, and then the fiber layer 21 is covered, and the press is rolled flat and densely dotted around the edges to obtain a 5.4mm heating layer 2. S3: Preparation of steam eye masks: A. Preparation of eye care layer 5: 10wt% hesperidin plant extract and 5wt% violet plant extract were electrostatically sprayed onto a hot air nonwoven fabric and dried with hot air in a countercurrent to obtain eye care layer 5. B. Preparation of steam eye masks: Polyethylene film and non-woven fabric are pressed together to form the first breathable layer 1; non-woven fabric and polymer are pressed together to form the second breathable layer 4; heating layer 2 is placed between the first breathable layer 1 and the second breathable layer 4, and pressed together to obtain the steam eye mask body; the two side loops 3 are connected; the eye care layer 5 is bonded to obtain the double-layer steam eye mask, which is then sealed and stored.

[0027] In this embodiment, the heating material 23 includes the following materials by weight: 45 parts iron powder, 8 parts activated carbon, 0.1 parts mimosa hydrogel, 5 parts cassia seed powder, 2 parts diatomaceous earth, and 20 parts distilled water. Example 3:

[0028] S1: Preparation of Mimosa hydrogel: The mimosa plant was crushed and washed, soaked in deionized water for 20 hours, placed in a constant temperature shaker at 55°C and shaken for 1.5 hours, poured into a microporous gauze bag for separation, the resulting hydrogel was placed in 100°C to remove impurities, hot filtered, dried at 60°C, ground, and sieved to obtain a 300μm mimosa hydrogel. S2: Preparation of heating layer 2: A. Under an inert gas environment, activated carbon, cassia seed powder, diatomaceous earth and distilled water are mixed evenly, iron powder and mimosa hydrogel are added, and the mixture is stirred evenly to form a heating material 23. B. In an inert gas environment, the fiber layer 21 is laid flat on the template of the press machine, and linseed oil adhesive, heating material 23, linseed oil adhesive, heating material 23, linseed oil adhesive, heating material 23, linseed oil adhesive, linseed oil adhesive, and then the fiber layer 21 is covered, flat rolling is performed, and dense spot rolling is performed around the perimeter to obtain a 7mm heating layer 2. S3: Preparation of steam eye masks: A. Preparation of eye care layer 5: 20wt% hesperidin plant extract and 8wt% violet plant extract were electrostatically sprayed onto hot air nonwoven fabric and dried with hot air countercurrent to obtain eye care layer 5. B. Preparation of steam eye masks: Polyethylene film and non-woven fabric are pressed together to form the first breathable layer 1; non-woven fabric and polymer are pressed together to form the second breathable layer 4; heating layer 2 is placed between the first breathable layer 1 and the second breathable layer 4, and pressed together to obtain the steam eye mask body; the two side loops 3 are connected; the eye care layer 5 is bonded to obtain the double-layer steam eye mask, which is then sealed and stored.

[0029] In this embodiment, the heating material 23 includes the following materials by weight: 65 parts iron powder, 16 parts activated carbon, 0.45 parts mimosa hydrogel, 12 parts cassia seed powder, 3 parts diatomaceous earth, and 30 parts distilled water. Example 4: One layer of heating material 23 and linseed oil adhesive were removed from heating layer 2; the details are as follows:

[0030] S1: Preparation of Mimosa hydrogel: The mimosa plant was crushed and washed, soaked in deionized water for 15 hours, placed in a constant temperature shaker at 50°C and shaken for 1 hour, poured into a microporous gauze bag for separation, the obtained hydrogel was placed in 90°C to remove impurities, hot filtered, dried at 55°C, ground, and sieved to obtain a 280μm mimosa hydrogel. S2: Preparation of heating layer 2: A. Under an inert gas environment, activated carbon, cassia seed powder, diatomaceous earth and distilled water are mixed evenly, iron powder and mimosa hydrogel are added, and the mixture is stirred evenly to form a heating material 23. B. In an inert gas environment, the fiber layer 21 is laid flat on the template of the press machine, and linseed oil adhesive, heating material 23, linseed oil adhesive, heating material 23, linseed oil adhesive are sprayed layer by layer, and then the fiber layer 21 is covered. The press is rolled flat and densely dotted around the edges to obtain a 6.5mm heating layer 2. S3: Preparation of steam eye masks: A. Preparation of eye care layer 5: 12wt% hesperidin plant extract and 6wt% violet plant extract were electrostatically sprayed onto a hot air nonwoven fabric and dried with hot air countercurrent to obtain eye care layer 5. B. Preparation of steam eye masks: Polyethylene film and non-woven fabric are pressed together to form the first breathable layer 1; non-woven fabric and polymer are pressed together to form the second breathable layer 4; heating layer 2 is placed between the first breathable layer 1 and the second breathable layer 4, and pressed together to obtain the steam eye mask body; the two side loops 3 are connected; the eye care layer 5 is bonded to obtain the double-layer steam eye mask, which is then sealed and stored.

[0031] In this embodiment, the heating material 23 includes the following materials by weight: 55 parts iron powder, 14 parts activated carbon, 0.35 parts mimosa hydrogel, 10 parts cassia seed powder, 2.6 parts diatomaceous earth, and 25 parts distilled water. Example 5: The heating layer 2 is directly mixed without using a step-by-step coating method; the details are as follows:

[0032] S1: Preparation of Mimosa hydrogel: The mimosa plant was crushed and washed, soaked in deionized water for 15 hours, placed in a constant temperature shaker at 50°C and shaken for 1 hour, poured into a microporous gauze bag for separation, the obtained hydrogel was placed in 90°C to remove impurities, hot filtered, dried at 55°C, ground, and sieved to obtain a 280μm mimosa hydrogel. S2: Preparation of heating layer 2: A. Under an inert gas environment, activated carbon, cassia seed powder, diatomaceous earth and distilled water are mixed evenly, and iron powder, mimosa hydrogel and linseed oil adhesive are added and stirred evenly to form a heating material 23. B. In an inert gas environment, the fiber layer 21 is laid flat on the template of the press, the heating material 23 is sprayed on, the fiber layer 21 is covered, and then flat rolling is performed. The surrounding area is densely dotted to obtain a 6.5mm heating layer 2. S3: Preparation of steam eye masks: A. Preparation of eye care layer 5: 12wt% hesperidin plant extract and 6wt% violet plant extract were electrostatically sprayed onto a hot air nonwoven fabric and dried with hot air countercurrent to obtain eye care layer 5. B. Preparation of steam eye masks: Polyethylene film and non-woven fabric are pressed together to form the first breathable layer 1; non-woven fabric and polymer are pressed together to form the second breathable layer 4; heating layer 2 is placed between the first breathable layer 1 and the second breathable layer 4, and pressed together to obtain the steam eye mask body; the two side loops 3 are connected; the eye care layer 5 is bonded to obtain the double-layer steam eye mask, which is then sealed and stored.

[0033] In this embodiment, the heating material 23 includes the following materials by weight: 55 parts iron powder, 14 parts activated carbon, 0.35 parts mimosa hydrogel, 10 parts cassia seed powder, 2.6 parts diatomaceous earth, and 25 parts distilled water. Comparative Example 6: A commercially available Zhenshimin steam eye mask.

[0034] Experiment 1: The antibacterial activity of the mimosa hydrogel prepared in Example 1 against Escherichia coli and Pseudomonas cereus was tested using the shaking method.

[0035] Conclusion: It has an inhibition rate of 98% against Escherichia coli and 95% against Pseudomonas aeruginosa, demonstrating excellent antibacterial properties. Therefore, it can effectively inhibit the occurrence of ocular inflammation.

[0036] Experiment 2: Using Comparative Example 6 as a control, the steam eye masks prepared in Examples 1-5 were opened and placed in a glass bottle equipped with an electronic thermometer, with only one outlet for air intake. The heating time, duration, temperature range during the duration, and maximum temperature were recorded. The results are shown in Table 1. Table 1

[0037] Conclusion: Based on the data from Examples 1-3, the steam eye mask prepared in Example 1 is superior. It has a shorter heating time of 1 minute, a longer duration, and a maximum temperature of 45°C, not exceeding 50°C, and can be maintained within the 40-42°C range for 31 minutes, exhibiting better isothermal heating performance compared to Comparative Example 6. Comparing Example 5, it can be found that the heating time of direct pressing is slower. This is because the direct doping of the adhesive layer 22 reduces the gaps between the powders, slightly delaying the reaction between air and iron powder. Furthermore, the maximum temperature is higher because the iron powder layer is thicker, leading to more reaction accumulation and an instantaneous temperature higher than the layer-by-layer coating temperature. Layer-by-layer spraying does not provide complete surface coverage but rather a partially coated surface. Each layer is thinner, with larger gaps than direct coating. During the reaction, the adhesive barrier between the heating iron powders and the heat exchange between layers lower the maximum temperature and increase temperature uniformity and durability. Example 4 reduces the number of adhesive layers 22 and heating materials 23, resulting in an increase in the content of other layers. This leads to a significantly shorter duration of heating and an increased maximum temperature, indicating that the current layer count is superior. The duration of constant-temperature heating can be controlled by adjusting the number of layers.

[0038] Experiment 3: Fifty office workers aged 25-45 were randomly selected and given the steam eye masks prepared in Example 1. The applicability evaluation is shown in Table 2. Table 2

[0039] Conclusion: The survey shows that the wearing comfort level reached 98%. The reason for dissatisfaction was a feeling of tightness behind the ears when wearing it. Regarding the fragrance, those who disliked it said they preferred the unscented version. Furthermore, there were no allergic reactions or abnormalities such as dizziness. Overall, it is a comfortable steam eye mask.

[0040] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A double-layered steam eye mask with constant temperature heating, characterized in that: The double-layer steam eye mask includes a steam eye mask body and an eye care layer (5), as well as ear loops (3) connected to both sides of the steam eye mask body; the eye care layer (5) is bonded to the side of the steam eye mask body near the eyes. The steam eye mask body includes a first breathable layer (1) and a second breathable layer (4), and a heating layer (2) disposed between the first breathable layer (1) and the second breathable layer; the heating layer (2) is in the shape of an inverted figure 8; the heating layer (2) includes several adhesive layers (22), and a heating material (23) is disposed between adjacent adhesive layers (22), and a fiber layer (21) is disposed on the side of the heating layer (2) close to the first breathable layer (1) and the second breathable layer (4).

2. The constant-temperature heating double-layer steam eye mask according to claim 1, characterized in that: The heating material (23) includes the following materials by weight: 45-65 parts iron powder, 8-16 parts activated carbon, 0.1-0.45 parts mimosa hydrogel, 5-12 parts cassia seed powder, 2-3 parts diatomaceous earth, and 20-30 parts distilled water.

3. A double-layered steam eye mask with constant temperature heating according to claim 1, characterized in that: The adhesive layer (22) is linseed oil adhesive.

4. A double-layer steam eye mask with constant temperature heating according to claim 1, characterized in that: The thickness of the heating layer (2) is 5.4~7mm; the thickness of the fiber layer (21) is 2mm.

5. A double-layered steam eye mask with constant temperature heating according to claim 1, characterized in that: The first breathable layer (1) consists of a microporous polyethylene film and a nonwoven fabric from top to bottom, and the nonwoven fabric is in contact with the fiber layer; the second breathable layer (4) consists of a nonwoven fabric and an advanced medical nonwoven fabric from top to bottom, and the nonwoven fabric is in contact with the fiber layer, and the advanced medical nonwoven fabric is in contact with the eye care layer (5).

6. A double-layered steam eye mask with constant temperature heating according to claim 5, characterized in that: The microporous polyethylene membrane has a pore size of 0.22~0.45μm; the advanced medical nonwoven fabric has a pore size of 2~3μm.

7. A double-layered steam eye mask with constant temperature heating according to claim 1, characterized in that: The eye care layer (5) includes hot air nonwoven fabric, hesperidin plant extract, and violet plant extract.

8. A method for preparing a double-layered steam eye mask with constant temperature heating, characterized in that: Includes the following steps: S1: Preparation of Mimosa hydrogel: Wash and crush the mimosa plant, soak it in deionized water for 10-20 hours, place it in a constant temperature shaker at 45-55℃ and shake for 0.5-1.5 hours, pour it into a microporous gauze bag for separation, place the obtained hydrogel in 80-100℃ to remove impurities, hot filter, dry at 50-60℃, grind, and sieve to obtain a 250-300μm mimosa hydrogel. S2: Preparation of heating layer (2): A. Under an inert gas environment, activated carbon, cassia seed powder, diatomaceous earth and distilled water are mixed evenly, iron powder and mimosa hydrogel are added, and the mixture is stirred evenly to obtain the heating material (23). B. In an inert gas environment, the fiber layer (21) is laid flat on the template of the press machine, and linseed oil adhesive, heating material (23), linseed oil adhesive, heating material (23), linseed oil adhesive are sprayed layer by layer, and then the fiber layer (21) is covered, flat rolling is performed, and dense spot rolling is performed around the perimeter to obtain a heating layer (2) of 5.4~7mm. S3: Preparation of double-layer steam eye mask: A. Preparation of the eye care layer (5): 10-20 wt% hesperidin plant extract and 5-8 wt% violet plant extract were electrostatically sprayed onto a hot air nonwoven fabric and dried with hot air in a countercurrent to obtain an eye care layer (5). B. Preparation of double-layer steam eye masks: Polyethylene film and non-woven fabric are pressed together to form the first breathable layer (1); non-woven fabric and polymer are pressed together to form the second breathable layer (4); heating layer (2) is placed between the first breathable layer (1) and the second breathable layer (4), and pressed together to obtain the steam eye mask body; the two side loops (3) are connected; the eye care layer (5) is bonded together to obtain the double-layer steam eye mask, which is then sealed and stored.

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