Steam eyeshade for preventing low-temperature scald and preparation method of steam eyeshade

Abstract

The invention relates to the technical field of eyeshades, in particular to a steam eyeshade for preventing low-temperature scald and a preparation method thereof, and the steam eyeshade comprises an outer layer, a heating layer, an inner layer and ear hooks; the heating layer is clamped between the outer layer and the inner layer; the outer layer is obtained by laminating a polyethylene film and a polypropylene non-woven fabric; the inner layer is obtained by laminating a polypropylene non-woven fabric and a breathable polyethylene film; the heating layer comprises the following raw materials: activated carbon, iron powder, water-absorbent resin, sodium chloride, vermiculite, a microcapsule fermentation swelling agent and deionized water. The steam eyeshade is uniform in heating and long in heating duration, and the problem of low-temperature scalding is not prone to occurring.

Description

Technical Field

[0001] This invention relates to the field of eye mask technology, and in particular to a steam eye mask for preventing low-temperature burns and its preparation method. Background Technology

[0002] The emergence and development of steam eye masks stems from modern people's increasing emphasis on eye health and comfort. With the widespread use of electronic devices and the accelerated pace of work and life, eye strain, dryness, and soreness caused by prolonged screen time are becoming increasingly common, especially among those who work late into the night, students, and office workers who frequently use electronic screens. Traditional relief methods such as cold compresses and eye drops, while effective to some extent, have limitations such as inconvenience and short-lived effects. The market urgently needs a convenient, safe, and effective eye care solution.

[0003] Against this backdrop, steam eye masks have emerged. Their design inspiration combines heat therapy with modern portable technology. Using self-heating, temperature-controlled materials, they release warm, moist steam at 40-50°C for 15-30 minutes, creating a localized, constant-temperature, humid environment. This gentle physical effect not only promotes blood circulation around the eyes and relieves muscle tension, but also moisturizes the skin around the eyes with steam, improving dryness. Simultaneously, the light-blocking design helps relax the mind and body, and even has a sleep-inducing function.

[0004] Early steam eye masks, primarily from Japanese brands, quickly captured the market with their sophisticated temperature control technology and comfortable user experience, subsequently sparking a global research and development boom. Through technological iteration, materials evolved from traditional polypropylene nonwoven fabric to more skin-friendly medical-grade fabrics, and the heating element progressed from anodized iron powder to a more stable thin sheet type, significantly improving safety and stability. Today, steam eye masks have expanded from single-function products to include diversified categories with added herbal extracts and fragrances, meeting the personalized needs of different groups and becoming an essential item for modern people's daily eye care and travel relaxation. Their widespread adoption not only reflects an upgrade in health-conscious consumption concepts but also embodies the deep integration of technology and humanistic care in the details of life.

[0005] The core principle of steam eye masks lies in the controlled oxidation reaction between iron powder and oxygen. Once the packaging is opened, air enters the eye mask through a precision breathable membrane, coming into contact with the iron powder, activated carbon, and other components to generate uniform heat and release trace amounts of water vapor. This process is strictly controlled by the oxygen permeability rate of the breathable membrane to prevent burns from excessively high temperatures or reduced effectiveness from excessively low temperatures. For example, the sheet-type design presses the heating element into a uniform 1mm thick sheet, ensuring stable and sustained heating, whereas earlier powder-type products might have experienced localized overheating due to uneven material distribution.

[0006] There is currently a lot of research on steam eye masks. For example, patent number CN116785060B discloses "a high moisturizing steam eye mask and its preparation method". It uses sericin cotton layer, polypropylene non-woven fabric layer, heating plate, polyethylene layer, ear loops and essence as raw materials, and adds traditional Chinese medicine ingredients and hydrogel to the heating plate for pressing. This steam eye mask can relieve symptoms such as dry eyes and pain caused by excessive or ultraviolet light stimulation, and the essence can be quickly absorbed by the skin to moisturize the skin.

[0007] For example, patent number CN110652394A discloses a "double-layer steam eye mask and its preparation method", which includes an eye mask body and a double-layer medicine pack. The steam eye mask has the effects of promoting blood circulation in the eyes, improving eyesight and refreshing the mind. Moreover, the process is simple and the production efficiency is high.

[0008] However, most steam eye masks on the market have unstable temperature control because the heating materials are not mixed evenly, and there is also the problem of low-temperature burns. Therefore, there is an urgent need to develop a steam eye mask that can heat evenly and effectively prevent low-temperature burns. Summary of the Invention

[0009] The purpose of this invention is to provide a steam eye mask for preventing low-temperature burns and its preparation method, so as to solve the problems of uneven heating, short heating duration, and easy occurrence of low-temperature burns in current steam eye masks.

[0010] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a steam eye mask for preventing low-temperature burns, comprising an outer layer, a heating layer, an inner layer, and ear loops; the heating layer is sandwiched between the outer and inner layers; the outer layer is formed by laminating a polyethylene film and a polypropylene nonwoven fabric; the inner layer is formed by laminating a polypropylene nonwoven fabric and a breathable polyethylene film; the heating layer is prepared using the following raw materials: activated carbon, iron powder, water-absorbing resin, sodium chloride, vermiculite, microcapsule fermentation leavening agent, and deionized water.

[0011] In some embodiments, the raw material for the heating layer also includes wheat flour.

[0012] This invention incorporates wheat flour as a raw material into a self-heating body. During the heating process, the wheat flour undergoes thermal fermentation and expansion, forming a porous structure. The expanded wheat flour compresses the air channels of the steam eye mask, thereby reducing the amount of oxygen entering and further preventing the steam eye mask from overheating and inhibiting the problem of low-temperature burns. In addition, the porous structure of the fermented wheat flour can maintain the internal temperature of the steam eye mask and prolong the heating time of the steam eye mask.

[0013] In some embodiments, by weight, the activated carbon comprises 10-15 parts, iron powder comprises 20-30 parts, water-absorbing resin comprises 5-10 parts, sodium chloride comprises 1-4 parts, vermiculite comprises 1-2 parts, wheat flour comprises 1-3 parts, microcapsule fermentation leavening agent comprises 0.5-1.5 parts, and deionized water comprises 5-10 parts.

[0014] In some embodiments, the microencapsulated fermentation leavening agent is prepared by spray drying with modified starch, β-cyclodextrin and gelatin as wall materials and sodium bicarbonate and yeast powder as core materials.

[0015] Currently, some steam eye masks are prone to causing low-temperature burns. The microcapsule fermentation leavening agent of this application can inhibit the further increase in temperature when the steam eye mask heats up to a specific temperature, thereby reducing the problem of low-temperature burns and strictly controlling the heating temperature of the steam eye mask. The reason for this is that the core material of the microcapsule fermentation leavening agent is made of sodium bicarbonate and yeast powder. Sodium bicarbonate begins to decompose and produce gas at around 50°C. The microcapsules expand and rupture. The expanded microcapsules will compress the air channels of the steam eye mask, reducing the amount of oxygen entering. In addition, the yeast powder will promote the fermentation and expansion of wheat flour. Under the synergistic effect, the heating temperature of the steam eye mask can be quickly controlled to prevent low-temperature burns.

[0016] In some embodiments, the method for preparing the modified starch includes the following steps: S1. Mix starch with sodium acetate buffer to form a suspension, add α-amylase and saccharifying enzyme to it, heat to 40~50℃ and stir for 8~12h, then add ethanol solution, centrifuge, wash with deionized water, and dry to obtain pretreated starch. S2. Mix polyacrylamide with deionized water, then add the pretreated starch obtained in step S1, and then stir at a constant temperature of 20~25℃ for 40~50 min. After centrifugation, filtration, and drying, the modified starch is obtained.

[0017] This application modifies the microcapsule fermentation leavening agent by mixing polyacrylamide with pretreated starch. The two cross-link through intermolecular hydrogen bonding, which gives the capsule wall structure a certain degree of toughness and allows it to expand.

[0018] In some embodiments, in step S2, the mass ratio of pretreated starch to polyacrylamide is 1:(0.2~0.5).

[0019] In some embodiments, the preparation method of the microcapsule fermentation leavening agent specifically includes the following steps: (1) Dissolve modified starch, β-cyclodextrin and gelatin in deionized water, mix and stir evenly, and then sterilize at 118~125℃ to obtain wall material; (2) Mix sodium bicarbonate and yeast powder evenly, add them to the wall material in step (1), then add emulsifier and emulsify in a homogenizing emulsifier to obtain an emulsion; (3) The emulsion from step (2) is spray-dried to obtain a microcapsule fermentation leavening agent.

[0020] In some embodiments, the emulsifier is any one of Tween 85, Tween 80, and Span 80.

[0021] In some embodiments, the mass ratio of the modified starch, β-cyclodextrin, and gelatin is (0.7~0.9):(0.3~0.5):1.

[0022] In some embodiments, the mass ratio of sodium bicarbonate to yeast powder is 1:(3~5).

[0023] Another aspect of the present invention provides a method for preparing a steam eye mask to prevent low-temperature burns, comprising the following steps: A1. Mix deionized water and water-absorbing resin evenly, then add activated carbon, iron powder, sodium chloride, vermiculite, wheat flour and microcapsule fermentation leavening agent and mix evenly through high-speed cyclone. Dry to constant weight in a dry and ventilated environment at 35~40℃, and then dry roll press into sheet form to obtain the heating layer. A2. Press polyethylene film and polypropylene nonwoven fabric together to obtain the outer layer, press polypropylene nonwoven fabric and breathable polyethylene film together to obtain the inner layer, place the heating layer obtained in step A1 between the outer layer and the inner layer and press them together, and equip ear loops on both sides, seal and store, and you will get a steam eye mask to prevent low-temperature burns.

[0024] Compared with the prior art, the present invention has the following beneficial effects: (1) The steam eye mask of the present invention includes an outer layer, a heating layer, an inner layer and ear loops. The heating layer is made from activated carbon, iron powder, water-absorbing resin, sodium chloride, vermiculite, wheat flour, microcapsule fermentation leavening agent and deionized water. The steam eye mask heats up evenly, has a short heating duration, and can prevent low-temperature burns.

[0025] (2) Wheat flour is added to the heating layer of the present invention. During the heating process of the self-heating body, the wheat flour will ferment and expand and form a porous structure. The expanded wheat flour will squeeze the air channel of the steam eye mask, thereby reducing the amount of oxygen entering and further preventing the problem of low temperature burns caused by excessively high temperature of the steam eye mask. In addition, the porous structure of the fermented wheat flour can maintain the temperature inside the steam eye mask and prolong the heating time of the steam eye mask.

[0026] (3) The microcapsule fermentation leavening agent of the present invention is prepared by spray drying with modified starch, β-cyclodextrin and gelatin as wall materials and sodium bicarbonate and yeast powder as core materials. The core material of the microcapsule fermentation leavening agent is obtained by mixing sodium bicarbonate and yeast powder. Sodium bicarbonate begins to decompose and produce gas at about 50°C. The microcapsules expand and rupture. The expanded microcapsules will squeeze the air channel of the steam eye mask to reduce the amount of oxygen entering. In addition, the yeast powder will promote the fermentation and expansion of wheat flour. Under the synergistic effect, the heating temperature of the steam eye mask can be quickly controlled to prevent low-temperature burns. Detailed Implementation

[0027] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0028] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0029] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of the invention. Various modifications and variations to the specific embodiments described in this specification are apparent to those skilled in the art without departing from the scope or spirit of the invention. Other embodiments derived from this specification will be apparent to those skilled in the art. This application specification and embodiments are merely exemplary.

[0030] Unless otherwise specified, the post-processing operations described below, such as "centrifugation", "washing", "drying", "filtration", "stirring", "emulsification", "mixing", "pressing", and "dry rolling", can be selected by those skilled in the art based on actual conditions, and are not further limited.

[0031] In the following preparation examples, embodiments, and comparative examples, the starch was corn starch; α-amylase, saccharifying enzyme, and yeast powder were all purchased from Hubei Haijia Biotechnology Co., Ltd.; polyacrylamide was purchased from Gongyi Xinqi Chemical Plant; β-cyclodextrin was purchased from Shandong Tongwang Biotechnology Co., Ltd.; gelatin was purchased from Jiangsu Jiujia Biotechnology Co., Ltd.; polyethylene film was purchased from Weifang Jiacheng Environmental Protection Equipment Co., Ltd.; breathable polyethylene film was purchased from Langfang Maxon Chemical Building Materials Co., Ltd.; polypropylene nonwoven fabric was purchased from Shandong Xingzhao Environmental Technology Co., Ltd.; water-absorbing resin was purchased from Zhengzhou Wandao New Material Technology Co., Ltd.; and wheat flour was purchased from Shangqiu Wufuzheng Food Co., Ltd.

[0032] Preparation Example 1 The method for preparing modified starch includes the following steps: S1. Mix 9g of starch with 3L of 0.1wt% sodium acetate buffer to prepare a suspension. Add 0.7g of α-amylase and 0.2g of saccharifying enzyme to the suspension. Heat the suspension to 45℃ and stir for 10h. Then add 95wt% ethanol solution. After centrifugation, wash with deionized water and dry to obtain pretreated starch. S2. Mix 1.5g of polyacrylamide with deionized water, then add 5g of the pretreated starch obtained in step S1, and then stir at a constant temperature of 22℃ for 45min. After centrifugation, filtration, and drying, the modified starch is obtained.

[0033] Preparation Example 2 The preparation method of modified starch is the same as that in Preparation Example 1, except that an equal mass of chitosan is used instead of polyacrylamide.

[0034] Preparation Example 3 The preparation method of modified starch is the same as in Preparation Example 1, except that the amount of polyacrylamide added is 3g.

[0035] Preparation Example 4 The preparation method of microencapsulated fermentation leavening agent specifically includes the following steps: (1) Dissolve 4g of modified starch, 2g of β-cyclodextrin and 5g of gelatin in 150mL of deionized water, mix and stir evenly, and then sterilize at 122℃ to obtain wall material; (2) Mix 9.5g sodium bicarbonate and 38.5g yeast powder evenly, add them to the wall material in step (1), then add 4.5g Tween 85 and emulsify in a homogenizer to obtain an emulsion; (3) The emulsion from step (2) is spray-dried at 45°C to obtain microcapsule fermentation leavening agent.

[0036] The modified starch was prepared in Preparation Example 1.

[0037] Preparation Example 5 The preparation method of the microcapsule fermentation leavening agent is the same as that in Preparation Example 4, except that the modified starch is prepared from Preparation Example 2.

[0038] Preparation Example 6 The preparation method of the microcapsule fermentation leavening agent is the same as that in Preparation Example 4, except that the modified starch is prepared from Preparation Example 3.

[0039] Preparation Example 7 The preparation method of the microcapsule fermentation leavening agent is the same as that in Preparation Example 4, except that an equal amount of sodium bicarbonate is used instead of yeast powder.

[0040] Preparation Example 8 The preparation method of the microcapsule fermentation leavening agent is the same as that in Preparation Example 4, except that an equal amount of yeast powder is used instead of sodium bicarbonate.

[0041] Preparation Example 9 The preparation method of the microcapsule fermentation leavening agent is the same as that in Preparation Example 4, except that the amount of sodium bicarbonate is 19.3g.

[0042] Preparation Example 10 The preparation method of the microcapsule fermentation leavening agent is the same as that in Preparation Example 4, except that starch is used instead of modified starch.

[0043] Example 1 A steam eye mask for preventing low-temperature burns includes an outer layer, a heating layer, an inner layer, and ear loops; the heating layer is sandwiched between the outer and inner layers; the outer layer is formed by laminating a polyethylene film and a polypropylene nonwoven fabric; the inner layer is formed by laminating a polypropylene nonwoven fabric and a breathable polyethylene film; the heating layer is prepared by using the following raw materials in parts by weight: 13 parts activated carbon, 25 parts iron powder, 7 parts water-absorbing resin, 3 parts sodium chloride, 1.5 parts vermiculite, 2 parts wheat flour, 1 part microcapsule fermentation leavening agent, and 7 parts deionized water.

[0044] The microcapsule fermentation leavening agent was prepared in Preparation Example 4.

[0045] The preparation method of a steam eye mask for preventing low-temperature burns includes the following steps: A1. Mix deionized water and water-absorbing resin evenly, then add activated carbon, iron powder, sodium chloride, vermiculite, wheat flour and microcapsule fermentation leavening agent and mix evenly through high-speed cyclone. Dry to constant weight in a dry and ventilated environment at 35°C, and then dry roll press into sheet form to obtain the heating layer. A2. Press polyethylene film and polypropylene nonwoven fabric together to obtain the outer layer, press polypropylene nonwoven fabric and breathable polyethylene film together to obtain the inner layer, place the heating layer obtained in step A1 between the outer layer and the inner layer and press them together, and equip ear loops on both sides, seal and store, and you will get a steam eye mask to prevent low-temperature burns.

[0046] The thickness of the heating layer is 2mm; the thickness of the outer layer is 0.8mm; and the thickness of the inner layer is 3mm.

[0047] Example 2 A steam eye mask for preventing low-temperature burns includes an outer layer, a heating layer, an inner layer, and ear loops; the heating layer is sandwiched between the outer and inner layers; the outer layer is formed by laminating a polyethylene film and a polypropylene nonwoven fabric; the inner layer is formed by laminating a polypropylene nonwoven fabric and a breathable polyethylene film; the heating layer is prepared by using the following raw materials in parts by weight: 10 parts activated carbon, 20 parts iron powder, 5 parts water-absorbing resin, 1 part sodium chloride, 1 part vermiculite, 1 part wheat flour, 0.5 parts microcapsule fermentation leavening agent, and 5 parts deionized water.

[0048] The microcapsule fermentation leavening agent was prepared in Preparation Example 4.

[0049] The preparation method of a steam eye mask for preventing low-temperature burns includes the following steps: A1. Mix deionized water and water-absorbing resin evenly, then add activated carbon, iron powder, sodium chloride, vermiculite, wheat flour and microcapsule fermentation leavening agent and mix evenly through high-speed cyclone. Dry to constant weight in a dry and ventilated environment at 38°C, and then dry roll press into sheet form to obtain the heating layer. A2. Press polyethylene film and polypropylene nonwoven fabric together to obtain the outer layer, press polypropylene nonwoven fabric and breathable polyethylene film together to obtain the inner layer, place the heating layer obtained in step A1 between the outer layer and the inner layer and press them together, and equip ear loops on both sides, seal and store, and you will get a steam eye mask to prevent low-temperature burns.

[0050] The thickness of the heating layer is 2mm; the thickness of the outer layer is 0.8mm; and the thickness of the inner layer is 3mm.

[0051] Example 3 A steam eye mask for preventing low-temperature burns includes an outer layer, a heating layer, an inner layer, and ear loops; the heating layer is sandwiched between the outer and inner layers; the outer layer is formed by laminating a polyethylene film and a polypropylene nonwoven fabric; the inner layer is formed by laminating a polypropylene nonwoven fabric and a breathable polyethylene film; the heating layer is prepared by using the following raw materials in parts by weight: 15 parts activated carbon, 30 parts iron powder, 10 parts water-absorbing resin, 4 parts sodium chloride, 2 parts vermiculite, 3 parts wheat flour, 1.5 parts microcapsule fermentation leavening agent, and 10 parts deionized water.

[0052] The microcapsule fermentation leavening agent was prepared in Preparation Example 4.

[0053] The preparation method of a steam eye mask for preventing low-temperature burns includes the following steps: A1. Mix deionized water and water-absorbing resin evenly, then add activated carbon, iron powder, sodium chloride, vermiculite, wheat flour and microcapsule fermentation leavening agent and mix evenly through high-speed cyclone. Dry to constant weight in a dry and ventilated environment at 40℃, and then dry roll press into sheet form to obtain the heating layer. A2. Press polyethylene film and polypropylene nonwoven fabric together to obtain the outer layer, press polypropylene nonwoven fabric and breathable polyethylene film together to obtain the inner layer, place the heating layer obtained in step A1 between the outer layer and the inner layer and press them together, and equip ear loops on both sides, seal and store, and you will get a steam eye mask to prevent low-temperature burns.

[0054] The thickness of the heating layer is 2mm; the thickness of the outer layer is 0.8mm; and the thickness of the inner layer is 3mm.

[0055] Example 4 A steam eye mask for preventing low-temperature burns includes an outer layer, a heating layer, an inner layer, and ear loops; the heating layer is sandwiched between the outer and inner layers; the outer layer is formed by laminating a polyethylene film and a polypropylene nonwoven fabric; the inner layer is formed by laminating a polypropylene nonwoven fabric and a breathable polyethylene film; the heating layer comprises the following raw materials in parts by weight: 13 parts activated carbon, 25 parts iron powder, 7 parts water-absorbing resin, 3 parts sodium chloride, 1.5 parts vermiculite, 1 part microcapsule fermentation leavening agent, and 7 parts deionized water.

[0056] The microcapsule fermentation leavening agent was prepared in Preparation Example 4.

[0057] The preparation method of a steam eye mask for preventing low-temperature burns includes the following steps: A1. Mix deionized water and water-absorbing resin evenly, then add activated carbon, iron powder, sodium chloride, vermiculite and microcapsule fermentation leavening agent and mix evenly by high-speed cyclone. Dry to constant weight in a dry and ventilated environment at 38°C, and then dry roll press into sheet form to obtain the heating layer. A2. Press polyethylene film and polypropylene nonwoven fabric together to obtain the outer layer, press polypropylene nonwoven fabric and breathable polyethylene film together to obtain the inner layer, place the heating layer obtained in step A1 between the outer layer and the inner layer and press them together, and equip ear loops on both sides, seal and store, and you will get a steam eye mask to prevent low-temperature burns.

[0058] Example 5 A steam eye mask for preventing low-temperature burns and its preparation method are described. The specific implementation method is the same as in Example 1, except that the microcapsule fermentation leavening agent is prepared in Example 5.

[0059] Example 6 A steam eye mask for preventing low-temperature burns and its preparation method are described. The specific implementation method is the same as in Example 1, except that the microcapsule fermentation leavening agent is prepared in Example 6.

[0060] Example 7 A steam eye mask for preventing low-temperature burns and its preparation method are described. The specific implementation method is the same as in Example 1, except that the microcapsule fermentation leavening agent is prepared in Example 7.

[0061] Example 8 A steam eye mask for preventing low-temperature burns and its preparation method are described. The specific implementation method is the same as in Example 1, except that the microcapsule fermentation leavening agent is prepared in Example 8.

[0062] Example 9 A steam eye mask for preventing low-temperature burns and its preparation method are described. The specific implementation method is the same as in Example 1, except that the microcapsule fermentation leavening agent is prepared in Example 9.

[0063] Example 10 A steam eye mask for preventing low-temperature burns and its preparation method are described. The specific implementation method is the same as in Example 1, except that the microcapsule fermentation leavening agent is prepared in Preparation Example 10.

[0064] Comparative Example 1 A steam eye mask for preventing low-temperature burns and its preparation method are described. The specific implementation method is the same as in Example 1, except that no microcapsule fermentation leavening agent is added.

[0065] Performance testing: The average temperature, maximum temperature, and duration exceeding 40°C on the surface of the steam eye mask during the heating phase were measured. The test results are shown in Table 1.

[0066] Table 1

[0067] Analysis of the data in Table 1 shows that the steam eye masks prepared in Examples 1-3 have good heating effects, with temperatures below 45℃ effectively preventing low-temperature burns, and the heating duration is long. In Example 4, due to the absence of wheat flour, the surface temperature of the steam eye mask reached a maximum of 52℃, with an average temperature of 49℃, making it prone to low-temperature burns, and the heat retention effect was poor. In Example 5, because an equal mass of chitosan was used instead of polyacrylamide, the mechanical properties of the microcapsule fermentation leavening agent decreased, making it unable to quickly form an expansion effect in the early stages to compensate for the fermentation gap of wheat flour, resulting in a slight increase in the maximum temperature. In Example 6, because the mass ratio of pretreated starch to polyacrylamide was changed, the cross-linked structure became denser, increasing rigidity and reducing the expansion of the microcapsule fermentation leavening agent, and the rupture was delayed, preventing the yeast powder from being released sufficiently and in a timely manner, thus increasing the maximum temperature of the steam eye mask. In Example 7, because an equal amount of sodium bicarbonate was used instead of yeast powder, the main function of sodium bicarbonate in this application is to expand and rupture the microcapsules to release yeast powder, while in Example... 7. Increased sodium bicarbonate content leads to the release of large amounts of gas, causing uneven pores and potentially defects in the self-heating structure. This results in insufficient pore sealing, leading to low-temperature burns and a lack of insulation. Example 8: Using an equal amount of yeast powder instead of sodium bicarbonate prevents the microcapsules from rupturing, resulting in slow wheat flour fermentation, insufficient pore sealing, low-temperature burns, and a lack of insulation. Example 9: Changing the mass ratio of sodium bicarbonate to yeast powder increases yeast activity, prolonging wheat flour fermentation time, worsening short-term temperature control, and thus increasing the maximum temperature. Example 10: Using starch instead of modified starch reduces the mechanical properties of the microcapsule fermentation leavening agent's capsule wall, preventing rapid expansion to compensate for the fermentation gap in wheat flour, resulting in a slight increase in the maximum temperature. Comparative Example 1: Without microcapsule fermentation leavening agent, the steam eye mask cannot effectively control the heating temperature, leading to low-temperature burns and a short heating duration.

[0068] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A steam eye mask for preventing low-temperature burns, characterized in that, It includes an outer layer, a heating layer, an inner layer, and ear loops; the heating layer is sandwiched between the outer layer and the inner layer; the outer layer is obtained by pressing polyethylene film and polypropylene nonwoven fabric together; the inner layer is obtained by pressing polypropylene nonwoven fabric and breathable polyethylene film together; the heating layer is prepared using the following raw materials: activated carbon, iron powder, water-absorbing resin, sodium chloride, vermiculite, microcapsule fermentation leavening agent, and deionized water.

2. A steam eye mask for preventing low-temperature burns according to claim 1, characterized in that, The heating layer is also made from wheat flour.

3. A steam eye mask for preventing low-temperature burns according to claim 2, characterized in that, By weight, the activated carbon comprises 10-15 parts, iron powder comprises 20-30 parts, water-absorbing resin comprises 5-10 parts, sodium chloride comprises 1-4 parts, vermiculite comprises 1-2 parts, wheat flour comprises 1-3 parts, microcapsule fermentation leavening agent comprises 0.5-1.5 parts, and deionized water comprises 5-10 parts.

4. A steam eye mask for preventing low-temperature burns according to claim 3, characterized in that, The microcapsule fermentation leavening agent is prepared by spray drying using modified starch, β-cyclodextrin and gelatin as wall materials and sodium bicarbonate and yeast powder as core materials.

5. A steam eye mask for preventing low-temperature burns according to claim 4, characterized in that, The method for preparing the modified starch includes the following steps: S1. Mix starch with sodium acetate buffer to form a suspension, add α-amylase and saccharifying enzyme to it, heat to 40~50℃ and stir for 8~12h, then add ethanol solution, centrifuge, wash with deionized water, and dry to obtain pretreated starch. S2. Mix polyacrylamide with deionized water, then add the pretreated starch obtained in step S1, and then stir at a constant temperature of 20~25℃ for 40~50 min. After centrifugation, filtration, and drying, the modified starch is obtained.

6. A steam eye mask for preventing low-temperature burns according to claim 5, characterized in that, In step S2, the mass ratio of pretreated starch to polyacrylamide is 1:(0.2~0.5).

7. A steam eye mask for preventing low-temperature burns according to any one of claims 4 to 6, characterized in that, The preparation method of the microcapsule fermentation leavening agent specifically includes the following steps: (1) Dissolve modified starch, β-cyclodextrin and gelatin in deionized water, mix and stir evenly, and then sterilize at 118~125℃ to obtain wall material; (2) Mix sodium bicarbonate and yeast powder evenly, add them to the wall material in step (1), then add emulsifier and emulsify in a homogenizing emulsifier to obtain an emulsion; (3) The emulsion from step (2) is spray-dried to obtain a microcapsule fermentation leavening agent.

8. A steam eye mask for preventing low-temperature burns according to claim 7, characterized in that, The mass ratio of the modified starch, β-cyclodextrin, and gelatin is (0.7~0.9):(0.3~0.5):

1.

9. A steam eye mask for preventing low-temperature burns according to claim 7, characterized in that, The mass ratio of sodium bicarbonate to yeast powder is 1:(3~5).

10. A method for preparing a steam eye mask for preventing low-temperature burns according to any one of claims 2 to 9, characterized in that, Includes the following steps: A1. Mix deionized water and water-absorbing resin evenly, then add activated carbon, iron powder, sodium chloride, vermiculite, wheat flour, and microencapsulated fermentation leavening agent. Mix evenly using a high-speed cyclone, and dry to constant weight in a dry and ventilated environment at 35-40℃. Then, dry roll press into sheets to obtain the heating layer. A2. Press polyethylene film and polypropylene nonwoven fabric together to obtain the outer layer, press polypropylene nonwoven fabric and breathable polyethylene film together to obtain the inner layer, place the heating layer obtained in step A1 between the outer layer and the inner layer and press them together, and equip ear loops on both sides, seal and store, and you will get a steam eye mask to prevent low-temperature burns.

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