Mirror surface antifogging material and preparation method thereof

Abstract

The invention discloses a mirror surface antifogging material, which is prepared from the following raw materials: a perfluoro solvent, perfluoropolyether and an adhesion auxiliary agent, and the adhesion auxiliary agent is polymethyl methacrylate and / or poly (hydroxyethyl methacrylate). The mirror surface anti-fog material is suitable for visual reflectors such as glass mirror surfaces, silver mirrors and aluminum mirrors, a transparent nano hydrophobic film can be formed on the mirror surfaces through simple spraying at normal temperature, the light transmittance of the formed film layer is high, and the mirror surface anti-fog material has the advantages of clear vision, long anti-fog time, fast film forming, no peculiar smell, simple operation and the like, and is suitable for popularization and application. The anti-fog mirror can be applied to articles such as bathroom mirrors, cosmetic mirrors, glasses and the like in daily life.

Description

Technical Field

[0001] This application relates to the field of polymer materials technology, specifically to a mirror anti-fog material and its preparation method. Background Technology

[0002] As optical devices widely used in daily life, industrial production, and specialized fields, the fogging phenomenon on mirror surfaces has always been a key issue affecting their performance. In scenarios such as bathrooms, kitchens, car cockpits, medical operating rooms, and diving equipment, mirror fogging not only causes inconvenience but may also pose safety hazards.

[0003] To address the problem of mirror fogging, various anti-fogging methods have been developed, mainly categorized into physical anti-fogging, chemical anti-fogging, and composite anti-fogging. Chemical anti-fogging technology achieves its effect by constructing functional coatings on the mirror surface. Based on their mechanism of action, these coatings can be divided into hydrophilic and hydrophobic coatings. Hydrophilic coatings introduce polar groups such as hydroxyl and carboxyl groups to reduce the surface energy of the mirror, allowing condensed water vapor to spread rapidly and form a uniform water film, preventing light scattering. However, these coatings generally suffer from insufficient durability: the hydrophilic groups are easily lost due to water immersion or wiping, causing the anti-fogging effect to diminish within hours to weeks; simultaneously, most hydrophilic coatings have low mechanical strength and are easily damaged by friction and scratches.

[0004] Hydrophobic coatings reduce the adhesion of water vapor to the mirror surface by creating a low surface energy surface, causing condensed droplets to roll off spontaneously. However, this technology is only suitable for low-humidity environments. Under high humidity conditions, droplets are difficult to roll off completely and may instead aggregate into larger droplets, also affecting light transmittance. Hydrophobic coatings using perfluoropolyether materials are used for waterproofing and moisture protection, but these are mostly used on circuit boards, focusing on protection and adhesion without considering the coating's impact on mirror clarity, optical transmittance, anti-fog performance, and suitability for home application.

[0005] Therefore, developing a mirror anti-fog material and its preparation method that combines durable anti-fog properties, high light transmittance, strong adhesion, and excellent mechanical properties, and is simple to prepare, low in cost, and environmentally friendly, has become an urgent technical problem to be solved in this field. Summary of the Invention

[0006] The purpose of this application is to provide a mirror anti-fog material with a long anti-fog time that does not affect visual clarity.

[0007] To achieve the above objectives, the technical solution adopted in this application is as follows: a mirror anti-fog material is provided, the raw materials for preparation include a perfluorinated solvent, a perfluorinated polyether and an adhesion promoter, wherein the adhesion promoter is polymethyl methacrylate and / or polyhydroxyethyl methacrylate.

[0008] As a preferred embodiment, the adhesion promoter has a mass fraction of 0.1% to 1%, the perfluoropolyether has a mass fraction of 0.2% to 2.0%, and the balance is the perfluoro solvent.

[0009] As another preferred embodiment, the perfluoropolyether has a molecular weight greater than 10,000.

[0010] As another preferred embodiment, the molecular weight of the polymethacrylate is 15,000 to 30,000, and the molecular weight of the polyhydroxyethyl methacrylate is 15,000 to 30,000.

[0011] As another preferred embodiment, the adhesion aid is a mixture of polymethyl methacrylate and polyhydroxyethyl methacrylate, wherein the mass ratio of polymethyl methacrylate to polyhydroxyethyl methacrylate is (1:3) to (3:1).

[0012] This application also provides a method for preparing a mirror anti-fog material, wherein a perfluoropolyether is mixed with a perfluoro solvent to form a mixed solution, an adhesion promoter is added to the mixed solution, and the mixture is mixed evenly to obtain the mirror anti-fog material, wherein the adhesion promoter is polymethyl methacrylate and / or polyhydroxyethyl methacrylate.

[0013] As another preferred option, at room temperature, 0.2% to 2.0% by mass of the perfluoropolyether is slowly added to the perfluoro solvent and stirred until a clear mixed solution is formed. Then, 0.1% to 1% of the adhesive additive is added to the mixed solution and mixed until homogeneous to form the mirror anti-fog material.

[0014] As another preferred embodiment, the perfluoropolyether has a molecular weight greater than 10,000.

[0015] As another preferred embodiment, the molecular weight of the polymethacrylate is 15,000 to 30,000, and the molecular weight of the polyhydroxyethyl methacrylate is 15,000 to 30,000.

[0016] More preferably, the adhesion aid is a mixture of polymethyl methacrylate and polyhydroxyethyl methacrylate, wherein the mass ratio of the polymethyl methacrylate to the polyhydroxyethyl methacrylate is (1:3) to (3:1).

[0017] Compared with the prior art, the beneficial effects of this application are as follows: (1) The anti-fog material of this application is suitable for visual reflectors such as glass mirrors, silver mirrors, and aluminum mirrors. A transparent nano-hydrophobic film can be formed on the mirror surface by simple spraying at room temperature. After the film is formed, it has high light transmittance, clear vision, long anti-fog time, fast film formation, no odor, and simple operation. It can be used for anti-fog application on bathroom mirrors, makeup mirrors, glasses and other items in daily life. (2) The mirror anti-fog material of this application is suitable for forming a transparent film of 200~500 nm on the visual reflector. The film stably covers the surface of the visual reflector and is not easily damaged or detached, thus maintaining the high definition and anti-fog performance of the visual reflector for a long time. Detailed Implementation

[0018] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0019] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0020] This application provides a mirror anti-fog material, the components of which include a perfluorinated solvent, a perfluorinated polyether and an adhesive additive, wherein the adhesive additive is polymethyl methacrylate (PMMA) and / or polyhydroxyethyl methacrylate (PHEMA).

[0021] The anti-fog material of this application is suitable for visual reflectors such as glass mirrors, silver mirrors, and aluminum mirrors. A transparent nano-hydrophobic film can be formed on the mirror surface by simple spraying at room temperature. After the film is formed, it has advantages such as high light transmittance, clear vision, long anti-fog time, fast film formation, no odor, and simple operation. It can be used for anti-fog application on bathroom mirrors, makeup mirrors, eyeglasses and other items in daily life.

[0022] In some embodiments, the perfluorinated solvent is perfluorobutyl methyl ether (PFME), CAS number 163702-07-6. PFME is characterized by high density, low viscosity, low surface tension, and excellent inertness, while also being non-toxic, non-corrosive, and volatile with no residue. Due to its good solubility and volatility, and its non-corrosiveness to electronic components, PFME can be used for cleaning electronic devices, effectively removing surface stains and impurities. It can also be used as an immersion coolant for heat dissipation in semiconductor and other equipment. Furthermore, PFME is a mild solvent suitable for use in refreshing cosmetic formulations, dissolving other ingredients, helping to improve the texture of cosmetics, making them easier to apply, and possessing good lubricity, making it suitable as a solvent for oil-based formulations.

[0023] In some embodiments, perfluoropolyether (PFPE) is a class of perfluorinated polymers, CAS number 69991-67-91, which typically possesses properties such as heat resistance, oxidation resistance, radiation resistance, corrosion resistance, and non-flammability. It is widely used in chemical, electronics, electrical appliances, machinery, nuclear industry, aerospace, and other fields. It can be used as a high-grade lubricant, vacuum pump oil, heat transfer fluid, etc., and is also commonly used for lubrication of chains in film equipment, high-temperature chains in glass fiber production, and high-temperature chains in textile tenter frames and stenters.

[0024] In some preferred embodiments, the molecular weight of the perfluoropolyether is >10,000. High molecular weight perfluoropolyether molecules have longer molecular chains and more stable structures, significantly enhancing their resistance to thermal decomposition. Even under high temperature and strong oxidizing environments, they are not easily degraded or broken, and can maintain chemical inertness for a long time, reducing the risk of volatilization and failure. They are suitable for lubrication and protection in extreme high-temperature environments such as aerospace engines, high-temperature bearings, and nuclear industry equipment.

[0025] Furthermore, high molecular weight PFPE has longer molecular chains and stronger intermolecular forces, resulting in a more robust and thicker lubricating film that effectively reduces the coefficient of friction and improves wear resistance. High molecular weight PFPE also has higher viscosity, making the lubricating film less likely to be "squeezed out" from the friction contact surface under high load and high speed conditions. This significantly improves its load-bearing capacity compared to low molecular weight products, reducing direct contact and wear between metal surfaces. It is suitable for applications requiring long-term lubrication and heavy load resistance, such as heavy machinery gears, precision instrument bearings, and high-pressure hydraulic systems.

[0026] The adhesion aid in this application is a transparent adhesion aid with high transparency and good adhesion performance. When compounded with perfluoropolyether and perfluoro solvent, it significantly extends the anti-fogging time of the material and makes the mirror surface clear.

[0027] Polymethyl methacrylate (PMMA), as a high-performance polymer material, excels primarily in its optical properties. Its visible light transmittance exceeds 92%, approaching that of ordinary glass, and it also offers some UV filtration, protecting internal components from UV damage while maintaining high transparency. This characteristic makes it highly competitive in scenarios requiring clear visibility. Simultaneously, its density is only about 1.18 g / cm³, roughly half that of ordinary glass, offering significant weight reduction. Furthermore, its impact resistance is 6-10 times that of glass, and even when broken, it shatters into blunt-angled fragments, making it far safer than glass. In addition, PMMA boasts excellent processing capabilities, allowing for the creation of complex shapes through injection molding, extrusion, hot bending, cutting, and engraving. Its surface can also undergo secondary processing such as coating, printing, and painting, greatly expanding its application range. Regarding weather resistance, it exhibits good stability against the atmosphere, rainwater, and common dilute acids and alkalis, and it does not yellow easily even after prolonged exposure to sunlight, resulting in a long service life.

[0028] These advantages make PMMA extremely versatile in its applications. In the construction and decoration industry, it is often used to replace glass in the production of doors, windows, partitions, and skylights, reducing structural load and improving safety. Billboards, light boxes, and signs also frequently use PMMA because its flexibility in coloring and engraving allows for diverse aesthetic needs. Optics and electronics are important application areas for PMMA, where it is used to manufacture optical components such as eyeglass lenses, camera lenses, and magnifying glasses, enhancing the user experience with its lightweight and high light transmittance. Its excellent light transmittance and processability are also fully utilized in products such as LCD displays, mobile phone screen protectors, and transparent dashboard covers. In daily necessities and handicrafts, food-grade PMMA can be used to make water cups and tableware. It is also commonly used in bathroom products such as bathtubs and sinks, as its smooth surface makes it easy to clean. Sculptures, ornaments, and jewelry utilize PMMA's ease of casting and engraving to create complex and exquisite shapes. PMMA is also indispensable in the medical and industrial fields. Medical products such as dental braces and surgical instrument covers utilize its transparent and sterilization-resistant properties. Laboratory petri dishes, test tubes, and other containers use it to replace glass to reduce the risk of breakage. Transparent shells and protective covers for industrial instruments also rely on its impact resistance to protect the delicate internal components.

[0029] Polyhydroxyethyl methacrylate (PHEMA) is a water-soluble or hydrophilic polymer formed by free radical polymerization of hydroxyethyl methacrylate (HEMA) monomers. Its molecular chain contains a large number of hydroxyl groups (-OH) and ester groups (-COO-), these polar groups endowing the material with unique physicochemical properties. As a typical hydrophilic polymer, PHEMA exhibits excellent biocompatibility and extremely low irritation to human tissues and cells, a characteristic that has made it a focus of attention in the biomedical field. Simultaneously, due to the presence of hydroxyl groups, PHEMA has good water absorption, capable of absorbing several times its own weight in water and swelling to form a soft and elastic hydrogel. This hydrogel not only has strong water retention but also a certain degree of air permeability, allowing small molecules such as oxygen and nutrients to pass through, providing a suitable microenvironment for cell growth or tissue repair.

[0030] The physicochemical properties of PHEMA are closely related to its degree of crosslinking. Crosslinked PHEMA hydrogels exhibit higher mechanical strength, and their swelling degree can be controlled by adjusting the crosslinking density, maintaining both shape stability and appropriate softness. In terms of processing performance, PHEMA can be prepared through solution polymerization, bulk polymerization, and other methods. It can also be copolymerized with other monomers to improve properties; for example, copolymerization with methyl methacrylate can increase the material's hardness, while copolymerization with more hydrophilic monomers can enhance water absorption. This flexible modification capability has led to a continuous expansion of PHEMA's application range.

[0031] In terms of applications, PHEMA's most representative use is in ophthalmology, particularly as a primary material for soft contact lenses. Its excellent hydrophilicity and breathability ensure a good fit between the lens and the cornea, reducing dryness and foreign body sensation during wear, while allowing oxygen to pass through the lens into the eye, maintaining normal corneal metabolism. In biomedical engineering, PHEMA hydrogel is often used as a tissue engineering scaffold. Its porous structure and good biocompatibility provide support for cell adhesion, proliferation, and differentiation, showing great potential in areas such as skin repair and cartilage regeneration. Furthermore, due to its hydrophilicity and biocompatibility, PHEMA can also be used in drug delivery systems. By adjusting the swelling and degradation rate of the material, controlled drug release can be achieved, prolonging the duration of drug efficacy. In cosmetics and daily chemical products, PHEMA is added to skincare products as a thickener and humectant, utilizing its water-absorbing properties to help the skin retain moisture and improve the product's texture. In the industrial field, PHEMA is also used to prepare coatings, adhesives and other products due to its good film-forming and adhesive properties, especially in special coatings that require hydrophilicity or biocompatibility.

[0032] The anti-fog material for mirrors disclosed in this application is suitable for forming a transparent film with a thickness of approximately 200-500 nm on the surface of a glass or aluminum mirror substrate. The film has a water contact angle ≥110° and an anti-fog time ≥72 hours. A larger water contact angle indicates better hydrophobicity of the film surface. Water droplets falling on the film surface are less likely to spread and are more likely to form spherical droplets that roll off, thus reducing water retention. Simultaneously, as water rolls off the surface, it carries away attached dust, impurities, etc., keeping the film surface clean. This is particularly advantageous in applications such as optical lenses that require long-term clarity or cleanliness.

[0033] The core of anti-fog time lies in superior anti-fog durability. Longer anti-fog time means the surface maintains a good affinity for water molecules, allowing condensed droplets to quickly spread into a uniform water film, preventing light scattering and maintaining mirror clarity for an extended period. Furthermore, longer anti-fog time also indicates that the surface maintains a long-term repulsion of water molecules, making it difficult for water vapor to condense into droplets or causing droplets to quickly gather and roll off. In this case, the coating needs superior weather resistance and scratch resistance to maintain the integrity of the hydrophobic structure.

[0034] This application also provides a method for preparing a mirror anti-fog material: at room temperature, a perfluoropolyether is mixed with a perfluoro solvent to form a clear solution, an adhesion promoter is added to the clear solution, and after mixing evenly, the mirror anti-fog material of this application is obtained.

[0035] In some preferred embodiments, the perfluoropolyether mass fraction is 0.2% to 2.0%, the adhesion promoter mass fraction is 0.1% to 1%, and the balance is a perfluoro solvent.

[0036] In some preferred embodiments, the perfluoropolyether has a molecular weight >10,000, the polymethyl methacrylate has a molecular weight range of 15,000 to 30,000, and the polyhydroxyethyl methacrylate has a molecular weight range of 15,000 to 30,000.

[0037] The preferred molecular weight range of the poly(hydroxyethyl methacrylate) in this application is 15,000 to 30,000, and its performance is closely related to the molecular chain length and structural characteristics. Poly(hydroxyethyl methacrylate) within this molecular weight range possesses both good hydrophilicity and crosslinking ability. The hydroxyl groups in the molecular chain can form hydrogen bonds with water molecules, enabling the material to maintain a certain mechanical strength while possessing excellent water absorption and swelling properties. Moreover, the degree of swelling is easily controlled, avoiding over-dissolution due to excessively small molecular weight and under-swelling due to excessively large molecular weight. This balanced swelling characteristic makes it perform well in scenarios requiring a stable hydration state.

[0038] From a processing performance perspective, PHEMA in this molecular weight range exhibits moderate viscosity and flowability, facilitating the fabrication of films, hydrogels, or coating materials through processes such as solution casting, coating, and cross-linking curing. Furthermore, the molded materials exhibit uniform structure and are less prone to performance fluctuations caused by excessively wide molecular weight distributions. Regarding biocompatibility, PHEMA at this molecular weight has a moderate chain length, preventing biotoxicity from the release of small molecule fragments while avoiding excessive rigidity due to overly long chains that could compromise its adhesion to biological tissues. Therefore, in the medical field, particularly as a material for contact lenses, wound dressings, or drug carriers, it better adapts to the biological environment, reducing irritation or rejection reactions.

[0039] This application also provides a method for using a mirror anti-fog material: after the mirror anti-fog material is made, it is filled and then evenly sprayed onto a dry mirror surface, and after drying, a transparent hydrophobic film layer is formed on the mirror surface.

[0040] In some preferred embodiments, allowing the mirror to stand for 3 to 10 minutes can form a transparent hydrophobic film layer on the mirror surface, or drying it with hot air at 30 to 45 ℃ for 1 to 2 minutes can form a transparent hydrophobic film layer on the mirror surface.

[0041] The anti-fog material of this application is suitable for forming a transparent film of 200~500 nm on a visual reflector. The film stably covers the surface of the visual reflector and is not easily damaged or detached, thus maintaining the high clarity and anti-fog performance of the visual reflector for a long time.

[0042] The anti-fog material of this application forms a film layer on the mirror surface with good thermal and moisture stability, and can still maintain good anti-fog performance in high humidity environment of 40~60 ℃.

[0043] After the anti-fog material of this application forms a film layer on the visual reflector, the film layer has a light transmittance of ≥95%, which can maximize the original light transmittance performance of the mirror. In this way, when the human eye observes through the mirror, it can obtain a clear and realistic image without the image becoming dim or the color distorted due to light loss. Especially in some scenarios where visual clarity is required, such as bathroom mirrors and car rearview mirrors, it can ensure that users can see the contents in the mirror clearly and avoid the inconvenience of observation caused by insufficient light transmittance.

[0044] The anti-fog material of this application has a haze of ≤2% after forming a film layer. The coating has a uniform internal structure and does not cause significant light scattering. When light passes through the coating, it can maintain a stable propagation direction and will not cause a hazy or blurry effect on the mirror surface due to scattering. This further improves the clarity of the mirror. Even when the anti-fog coating is working to prevent the mirror from fogging, it can also avoid visual interference caused by itself, keeping the mirror surface clear and clean at all times. Whether for daily use or in specific working environments, it can provide users with a high-quality visual experience, taking into account both anti-fog function and good optical performance.

[0045] The preparation method of this application is simple, requiring no high-speed nano-homogenizer or pressureless dispersion equipment, and is easy to operate. The product has strong stability and is suitable for large-scale rapid production.

[0046] Example 1 Preparation of a mirror anti-fog material: At room temperature, 0.15 g of perfluorinated polyether is slowly added to 9.8 g of perfluorinated solvent (CAS: 163702-07-6), stirred until a clear solution is formed, 0.05 g of polymethyl methacrylate is added to the clear solution, mixed and filled, sprayed on a plastic mirror and allowed to stand and dry to form a transparent film layer. The molecular weight of perfluoropolyether is approximately 20,000, and the molecular weight of polymethyl methacrylate is 20,000.

[0047] The experiment showed that the contact angle of the film layer in Example 1 was 113.5°, the light transmittance was 97.4%, and the anti-fog maintenance time was 72 hours (40℃ / RH90%, n=3, average value).

[0048] Example 2 The adhesion promoter was replaced with poly(hydroxyethyl methacrylate) with a molecular weight of 20,000, and the remaining preparation steps were the same as those in Example 1.

[0049] The experiment showed that the contact angle of the film layer in Example 2 was 112.0°, the light transmittance was 97.6%, and the anti-fogging time was 70 h.

[0050] Example 3 The adhesion aid was replaced with a mixture of polymethyl methacrylate and polyhydroxyethyl methacrylate, which were mixed in a mass ratio of 1:1, and the total mass of the adhesion aid was 0.05 g. Other preparation steps were the same as those in Example 1.

[0051] The experiment showed that the contact angle of the film layer in Example 3 was 115.1°, the light transmittance was 98.1%, and the anti-fog maintenance time was 93 h.

[0052] Example 4 The ratio of polymethyl methacrylate to polyhydroxyethyl methacrylate was adjusted to 3:1, and the other preparation steps remained the same as those in Example 1.

[0053] The experiment showed that the contact angle of the film layer in Example 4 was 114.9°, the light transmittance was 98.0%, and the anti-fog maintenance time was 88 h.

[0054] Example 5 The ratio of polymethyl methacrylate to polyhydroxyethyl methacrylate was adjusted to 1:3, and the other preparation steps remained the same as those in Example 1.

[0055] The experiment showed that the contact angle of the film layer in Example 5 was 114.6°, the light transmittance was 97.7%, and the anti-fog maintenance time was 85 h.

[0056] Comparative Example 1 Without adding an adhesion aid to the clear solution, the other preparation steps were kept consistent with those in Example 1 to prepare the material of Comparative Example 1.

[0057] The experiment yielded a film contact angle of 105.0°, a light transmittance of 96.0%, and an anti-fogging duration of 28 h for Comparative Example 1.

[0058] Comparative Example 2 The molecular weight of the perfluoropolyether was adjusted to 8000, and the other preparation steps were kept the same as those in Example 1 to prepare the material of Comparative Example 2.

[0059] The experiment yielded a film contact angle of 107.0°, a light transmittance of 96.2%, and an anti-fogging duration of 40 h for Comparative Example 2.

[0060] Comparative Example 3 The molecular weight of polymethyl methacrylate was adjusted to approximately 10,000, while the other preparation steps remained consistent with those in Example 1.

[0061] The experiment yielded a contact angle of 109.0°, a light transmittance of 96.5%, and an anti-fogging duration of 50 h for the film layer in Comparative Example 1.

[0062] Comparing the performance test results of the above embodiments with those of the comparative examples, the mirror anti-fog material with the adhesion additive of this application significantly prolongs the anti-fog time, and the optimal anti-fog time can be obtained when the addition amount of polymethyl methacrylate and polyhydroxyethyl methacrylate is 1:1, which is 232% higher than that of the material in Comparative Example 1.

[0063] The anti-fog material of this application can easily and quickly form an anti-fog transparent layer on a visual reflector. This coating has high light transmittance and advantages such as clear vision, long anti-fog time, fast molding and no defects. It is suitable for anti-fog applications such as bathroom mirrors, makeup mirrors, and glasses.

[0064] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A mirror-finish anti-fog material, characterized in that, The raw materials for preparation include perfluorinated solvents, perfluorinated polyethers, and adhesive additives, wherein the adhesive additives are polymethyl methacrylate and / or polyhydroxyethyl methacrylate.

2. The anti-fog material for mirror surfaces as described in claim 1, characterized in that, The adhesion aid has a mass fraction of 0.1% to 1%, the perfluoropolyether has a mass fraction of 0.2% to 2.0%, and the balance is the perfluoro solvent.

3. The anti-fog material for mirror surfaces as described in claim 1, characterized in that, The molecular weight of the perfluoropolyether is greater than 10,000.

4. The anti-fog material for mirror surfaces as described in claim 1, characterized in that, The molecular weight of the polymethacrylate is 15,000 to 30,000, and the molecular weight of the polyhydroxyethyl methacrylate is 15,000 to 30,000.

5. The anti-fog material for mirror surfaces as described in claim 1, characterized in that, The adhesion aid is a mixture of polymethyl methacrylate and polyhydroxyethyl methacrylate, wherein the mass ratio of polymethyl methacrylate to polyhydroxyethyl methacrylate is (1:3) to (3:1).

6. A method for preparing a mirror-finish anti-fog material, characterized in that, A perfluoropolyether is mixed with a perfluoro solvent to form a mixed solution. An adhesion aid is added to the mixed solution, and after mixing evenly, the mirror anti-fog material is obtained. The adhesion aid is polymethyl methacrylate and / or polyhydroxyethyl methacrylate.

7. The preparation method according to claim 6, characterized in that, At room temperature, 0.2% to 2.0% by mass of the perfluoropolyether is slowly added to the perfluoro solvent and stirred until a clear mixed solution is formed. 0.1% to 1% of the adhesive additive is added to the mixed solution and mixed until uniform to form the mirror anti-fog material.

8. The preparation method according to claim 6, characterized in that, The molecular weight of the perfluoropolyether is greater than 10,000.

9. The preparation method according to claim 6, characterized in that, The molecular weight of the polymethacrylate is 15,000 to 30,000, and the molecular weight of the polyhydroxyethyl methacrylate is 15,000 to 30,000.

10. The preparation method according to claim 6, characterized in that, The adhesion aid is a mixture of polymethyl methacrylate and polyhydroxyethyl methacrylate, wherein the mass ratio of polymethyl methacrylate to polyhydroxyethyl methacrylate is (1:3) to (3:1).