Fluorosilicate hybrid transparent anti-fingerprint coating and method of making the same
By leveraging the synergistic effect of methyltrimethoxysilane, acidic silica sol, and perfluoropolyether, a fluorosilicone hybrid transparent anti-fingerprint coating is constructed, overcoming the shortcomings of traditional coatings in terms of mechanical durability, adhesion, and environmental adaptability, and achieving a balance between high transparency, hardness, and anti-fingerprint performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GUANGZHOU UNIVERSITY
- Filing Date
- 2026-06-30
- Publication Date
- 2026-07-28
AI Technical Summary
Existing anti-fingerprint coatings struggle to balance mechanical durability, environmental durability, and high adhesion, and traditional fluorinated compounds pose environmental risks, making it difficult to achieve long-term use and good adaptability.
A gradient-structured fluorosilicone hybrid transparent anti-fingerprint coating was constructed by utilizing the synergistic effect of methyltrimethoxysilane, acidic silica sol, and perfluoropolyether. Strong adhesion and oleophobicity were achieved through chemical bonding, and the coating was prepared using the sol-gel method.
While maintaining high optical transparency, the coating has excellent mechanical hardness and scratch resistance, achieving strong adhesion, overcoming the technical contradictions of traditional coatings, and is environmentally friendly and suitable for a variety of substrates.
Smart Images
Figure CN122465408A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of coating preparation technology, and in particular to a fluorosilicone hybrid transparent anti-fingerprint coating and its preparation method. Background Technology
[0002] Currently, anti-fingerprint coatings mainly follow two technical paths: superoleophobic surfaces (lotus effect) and liquid-like surfaces (perfluoropolyether or polydimethylsiloxane). Among them, fluorinated coatings based on perfluoropolyether have become the mainstream choice for high-end anti-fingerprint applications due to their extremely low surface energy, good optical transparency, and chemical inertness. However, existing anti-fingerprint coating technologies still face many severe challenges: First, it is often difficult to balance the mechanical durability (abrasion and scratch resistance) and environmental durability (sweat and UV aging resistance) of the coating, and frequent use can easily lead to the failure of the functional layer; second, while ensuring excellent anti-fingerprint performance, how to balance high adhesion, film uniformity, and hardness matching with the substrate is a key difficulty in the preparation process; in addition, the environmental persistence and bioaccumulation risks brought by traditional fluorinated compounds have also prompted the industry to explore more environmentally friendly and sustainable chemical systems.
[0003] The aforementioned shortcomings indicate an urgent need to develop a new type of anti-fingerprint coating that combines excellent protective performance, long service life, and good environmental adaptability. Summary of the Invention
[0004] The purpose of this invention is to provide a fluorosilicone hybrid transparent anti-fingerprint coating and its preparation method. Through the synergistic effect of methyltrimethoxysilane, acidic silica sol, and perfluoropolyether, a fluorosilicone hybrid transparent anti-fingerprint coating with a gradient structure is constructed. This coating maintains extremely high optical transparency while also possessing excellent mechanical hardness and scratch resistance, overcoming the technical contradiction of traditional anti-fingerprint coatings that struggle to balance hardness and oleophobicity. The dense inorganic network at the bottom layer achieves strong adhesion to various substrates such as glass and metal through chemical bonding, avoiding the defect of easy peeling of fluorine coatings.
[0005] To achieve the above objectives, the present invention provides a fluorosilicone hybrid transparent anti-fingerprint coating, comprising the following raw materials by weight: 10-30 parts methyltrimethoxysilane, 4-6 parts isopropanol, 2-3 parts acetic acid, 20-30 parts acidic silica sol, 1-2 parts perfluoropolyether, 10-15 parts fluorinated solvent, 15-30 parts butyl acetate, and 5-8 parts deionized water.
[0006] Preferably, the fluorinated solvent is methoxynonfluorobutane or ethoxynonfluorobutane.
[0007] The method for preparing the above-described fluorosilicone hybrid transparent anti-fingerprint coating includes the following steps: S1. Dissolve methyltrimethoxysilane in a mixed solution of deionized water and isopropanol, then add acetic acid and stir to obtain mixture A; S2. Mix mixture A and acidic silica sol, stir, and obtain mixture B; S3. Mix mixture B and perfluoropolyether, add fluorinated solvent and butyl acetate, adjust the solution to be clear and transparent, stir, and obtain the coating. S4. Apply the coating evenly to the substrate surface, let it stand, and then perform heat curing to obtain a fluorosilicone hybrid transparent anti-fingerprint coating.
[0008] Preferably, in S1, the stirring temperature is room temperature and the stirring time is 16 hours.
[0009] Preferably, in S2, the stirring temperature is room temperature, the stirring time is 2 hours, and the mass ratio of mixture A to acidic silica sol is (1-3):(2-3).
[0010] Preferably, in S3, the stirring temperature is room temperature, the stirring time is 24h, and the mass ratio of mixture B to perfluoropolyether is (60-80):(1-2).
[0011] Preferably, in S4, the substrate material is either glass or metal.
[0012] Preferably, in S4, the settling time is 30 minutes.
[0013] Preferably, in S4, the heat curing temperature is 100℃ and the heat curing time is 2h.
[0014] Therefore, the present invention employs the above-mentioned fluorosilicone hybrid transparent anti-fingerprint coating and its preparation method, which has the following beneficial effects: (1) An organosilicon network formed by the hydrolysis and condensation of methyltrimethoxysilane serves as the crosslinking framework, while acidic silica sol provides abundant active silanol anchors. Perfluoropolyether, as a low surface energy functional unit, migrates to the surface and is chemically grafted during the curing process. The three work together to construct a stable oleophobic and hydrophobic surface layer. The resulting coating can achieve a contact angle of 95°-102° against artificial fingerprint liquid. Water, hexadecane, peanut oil, and artificial fingerprint liquid can all slide off without residue on the inclined surface. After pressing with a real fingerprint, there is almost no visible residue, thus overcoming the defects of existing anti-fingerprint coatings, such as easy wear of the oleophobic layer and rapid decay of the contact angle.
[0015] (2) The hydrolysis products of methyltrimethoxysilane are uniformly bonded to the nano-silica particles in the acidic silica sol through Si-O-Si chemical bonds. The refractive indices of the two are matched, avoiding light scattering caused by nanoparticle aggregation or phase separation. Therefore, the average transmittance of the coating in the 400-800nm visible light band can reach 95%-98%, which is basically consistent with the blank glass substrate, effectively solving the problem of reduced transmittance of traditional anti-fingerprint coatings due to the addition of inorganic fillers.
[0016] (3) Acidic silica sol, as an inorganic reinforcing phase, has nanoparticles with abundant silanol groups on their surface. These silanols can co-condense with oligomeric siloxanes formed by the hydrolysis of methyltrimethoxysilane, embedding themselves into the hybrid network through chemical bonds to form a rigid framework with high cross-linking density.
[0017] (4) The silanol groups generated by the hydrolysis of methyltrimethoxysilane undergo a condensation reaction with the hydroxyl groups on the surface of glass, metal and other substrates to form a chemical bond interface; the addition of silica sol further increases the interfacial anchoring points; the appropriate amount of perfluoropolyether is introduced without destroying the interfacial bonding, but rather enriched in the surface layer to exert an oleophobic function. This gradient structure with a dense bottom layer and a low surface energy on the surface layer enables the coating to maintain high hardness while having strong adhesion, overcoming the problems of easy peeling and weak bonding with the substrate of traditional fluorinated coatings.
[0018] (5) The sol-gel method is adopted. The raw materials are readily available and the process is simple. It can form a film over a large area by spraying, dipping and other methods. The cost is controllable and it is easy to promote industrialization. It effectively overcomes the defects of existing anti-fingerprint coatings such as poor mechanical durability, insufficient adhesion and poor environmental friendliness. It has broad application prospects in consumer electronics, smart home, automotive interior and other fields.
[0019] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description
[0020] Figure 1 This is a solution product illustration of Example 3 of the present invention, which describes a fluorosilicone hybrid transparent anti-fingerprint coating and its preparation method. Figure 2 This is an adhesion test result diagram of Example 3 of the present invention, which describes a fluorosilicone hybrid transparent anti-fingerprint coating and its preparation method. Figure 3 This is a liquid slip verification result diagram of Example 3 of the present invention, which describes a fluorosilicone hybrid transparent anti-fingerprint coating and its preparation method. Figure 3 (a) in the figure shows the verification results of water sliding. Figure 3 (b) in the figure shows the verification results of hexadecane slippage. Figure 3 (c) in the figure shows the verification results of peanut oil slippage. Figure 3 (d) in the figure shows the verification result of artificial fingerprint liquid slippage. Detailed Implementation
[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention. Furthermore, it should be understood that after reading the contents of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims and are all within the protection scope of the present invention.
[0022] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.
[0023] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.
[0024] In this invention, unless otherwise specified, all other test materials and instruments are conventional test materials in the field and can be purchased through commercial channels.
[0025] Example 1 This invention provides a fluorosilicone hybrid transparent anti-fingerprint coating, the preparation method of which includes the following steps: Dissolve 15 parts by mass of methyltrimethoxysilane in 5 parts by mass of deionized water and 4 parts by mass of isopropanol, then add 2 parts by mass of acetic acid, and stir at room temperature for 16 hours to obtain mixture A, which is then ready for use.
[0026] Mixture B was prepared by stirring 13 parts by weight of mixture A and 20 parts by weight of acidic silica sol at room temperature for 2 hours. Mixture B (60 parts by weight) and 1 part by weight of perfluoropolyether were then mixed, followed by the addition of 12 parts by weight of methoxynonfluorobutane and 20 parts by weight of butyl acetate. The mixture was adjusted to a clear and transparent state and then stirred at room temperature (approximately 25°C) for 24 hours. The coating solution was then uniformly applied to a glass substrate. After the prepared sample was left to stand for 30 minutes, it was then subjected to simple thermosetting at 100°C for 2 hours to obtain a fluorosilicone hybrid transparent anti-fingerprint coating.
[0027] Example 2 This invention provides a fluorosilicone hybrid transparent anti-fingerprint coating, the preparation method of which includes the following steps: 20 parts by weight of methyltrimethoxysilane were dissolved in 7 parts by weight of deionized water and 5 parts by weight of isopropanol, and then 3 parts by weight of acetic acid were added. The mixture was stirred at room temperature for 16 hours to obtain mixture A, which was set aside for later use. 11 parts by weight of mixture A and 23 parts by weight of acidic silica sol were stirred at room temperature for 2 hours to obtain mixture B. 70 parts by weight of mixture B and 2 parts by weight of perfluoropolyether were mixed, and then 12 parts by weight of methoxynonfluorobutane and 20 parts by weight of butyl acetate were added. The mixture was adjusted to a clear and transparent state and then stirred at room temperature (approximately 25°C) for 24 hours. The coating solution was uniformly coated onto a glass substrate. The prepared sample was then left to stand for 30 minutes and then subjected to simple thermosetting at 100°C for 2 hours to obtain a fluorosilicone hybrid transparent anti-fingerprint coating.
[0028] Example 3 This invention provides a fluorosilicone hybrid transparent anti-fingerprint coating, the preparation method of which includes the following steps: Dissolve 12 parts by weight of methyltrimethoxysilane in 6 parts by weight of deionized water and 6 parts by weight of isopropanol, then add 2.5 parts by weight of acetic acid, and stir at room temperature for 16 hours to obtain mixture A, which is set aside for later use. Stir 15 parts by weight of mixture A and 27 parts by weight of acidic silica sol at room temperature for 2 hours to obtain mixture B. Mix 78 parts by weight of mixture B and 1.5 parts by weight of perfluoropolyether, then add 12 parts by weight of methoxynonfluorobutane and 20 parts by weight of butyl acetate, adjusting the mixture solution to clear and transparent (e.g., ...). Figure 1 As shown in the figure, the mixture was then stirred at room temperature (approximately 25°C) for 24 hours. The coating solution was then uniformly applied to the surface of a glass substrate. Subsequently, the prepared sample was left to stand for 30 minutes, followed by simple thermosetting at 100°C for 2 hours to obtain a fluorosilicone hybrid transparent anti-fingerprint coating.
[0029] Comparative Example 1 This comparative example presents a coating, the preparation method of which includes the following steps: Mixture A was prepared by dissolving 5 parts by mass of methyltrimethoxysilane in 6 parts by mass of deionized water and 5 parts by mass of isopropanol, followed by the addition of 2 parts by mass of acetic acid and stirring at room temperature for 16 hours. Mixture B was prepared by stirring 13 parts by mass of mixture A and 15 parts by mass of acidic silica sol at room temperature for 2 hours. Mixture B was prepared by mixing 60 parts by mass of mixture B and 1 part by mass of perfluoropolyether, followed by the addition of 12 parts by mass of methoxynonfluorobutane and 20 parts by mass of butyl acetate, adjusting the mixture to a clear and transparent state, and then stirring at room temperature (approximately 25°C) for 24 hours. The coating solution was then uniformly applied to a glass substrate. After the prepared sample was left to stand for 30 minutes, it was then subjected to simple heat curing at 100°C for 2 hours to obtain the coating.
[0030] Comparative Example 2 This comparative example presents a coating, the preparation method of which includes the following steps: 15 parts by weight of methyltrimethoxysilane were dissolved in 6 parts by weight of deionized water and 5 parts by weight of isopropanol, and then 3 parts by weight of acetic acid were added. The mixture was stirred at room temperature for 20 hours to obtain mixture A, which was set aside for later use. 12 parts by weight of mixture A and 50 parts by weight of acidic silica sol were stirred at room temperature for 1 hour to obtain mixture B. 70 parts by weight of mixture B and 1 part by weight of perfluoropolyether were mixed, and then 12 parts by weight of methoxynonfluorobutane and 20 parts by weight of butyl acetate were added. The mixture was adjusted to a clear and transparent state and then stirred at room temperature (approximately 25°C) for 16 hours. The coating solution was uniformly coated onto a glass substrate. Subsequently, the prepared sample was left to stand for 30 minutes and then subjected to simple heat curing at 80°C for 1 hour to obtain the coating.
[0031] Comparative Example 3 This comparative example presents a coating, the preparation method of which includes the following steps: 15 parts by weight of methyltrimethoxysilane were dissolved in 6 parts by weight of deionized water and 5 parts by weight of isopropanol, and then 5 parts by weight of acetic acid were added. The mixture was stirred at room temperature for 18 hours to obtain mixture A, which was set aside for later use. 12 parts by weight of mixture A and 40 parts by weight of acidic silica sol were stirred at room temperature for 1 hour to obtain mixture B. 62 parts by weight of mixture B and 1 part by weight of perfluoropolyether were mixed, and then 12 parts by weight of methoxynonfluorobutane and 20 parts by weight of butyl acetate were added. The mixture was adjusted to a clear and transparent state and then stirred at room temperature (approximately 25°C) for 24 hours. The coating solution was uniformly coated onto a glass substrate. The prepared sample was then left to stand for 30 minutes and then subjected to simple heat curing at 100°C for 1 hour to obtain the coating.
[0032] The coatings prepared in Examples 1-3 and Comparative Examples 1-3 were subjected to performance tests: Pencil hardness: Refer to GB / T 6739-2022 "Determination of Hardness of Paints and Varnishes by Pencil Method"; Transmittance: The optical properties of the coating were determined using a UV-Vis spectrophotometer. A blank glass substrate was used as a reference, and the transmittance of the sample was recorded in the wavelength range of 400 nm to 800 nm at room temperature. Contact angle: Refer to GB / T 30447-2013 "Method for measuring contact angle of nanofilms".
[0033] The test results are shown in Table 1.
[0034] Table 1 Performance Test Results
[0035] As shown in Table 1, in Example 1, methyltrimethoxysilane (15 parts) underwent hydrolysis and condensation under the catalysis of water, isopropanol, and acetic acid to form an oligomeric siloxane network (mixture A). This network was then mixed with 20 parts of acidic silica sol. The active silanol groups on the silica sol surface further condensed with the silanol groups in mixture A, forming an organic-inorganic hybrid framework linked by Si-O-Si bonds (mixture B). When 1 part of perfluoropolyether was added, the reactive groups (such as alkoxy or hydroxyl groups) at the ends of the perfluoropolyether could co-condense with the residual silanol groups in mixture B, thereby fixing them to the surface via chemical bonds. In this formulation, methyltrimethoxysilane provided sufficient crosslinking density, the silica sol was uniformly dispersed and provided mechanical reinforcement, while avoiding excessive addition of inorganic phase leading to brittleness or agglomeration. Appropriate grafting of the perfluoropolyether imparted low surface energy without excessively hindering curing. The three components synergistically formed a dense, transparent, and high-hardness coating at the molecular to nanoscale, achieving a hardness of 9H, a light transmittance of 97%, and a contact angle of 95°.
[0036] In Example 2, the amount of methyltrimethoxysilane was increased to 20 parts, the amount of mixture A was reduced to 11 parts, the amount of silica sol was increased to 23 parts, the amount of mixture B was 70 parts, and the amount of perfluoropolyether was increased to 2 parts. The increased proportion of methyltrimethoxysilane increased the self-condensation degree of the hydrolysate, resulting in a higher cross-linking density of the hybrid network formed after mixing with silica sol, theoretically maintaining a hardness of 9H. However, excessive methyltrimethoxysilane may lead to partial self-condensation, generating hydrophobic microregions. Simultaneously, while a slight increase in silica sol is beneficial to hardness, it may slightly affect optical uniformity (local fluctuations in refractive index), thus slightly reducing the transmittance to 95%. Doubling the amount of perfluoropolyether resulted in a higher surface fluorine content and a slightly increased contact angle to 96°. However, excessive perfluoropolyether may form locally enriched phases, having a slight negative effect on transmittance. Nevertheless, the overall synergy remains within acceptable limits, and the hardness remains at 9H.
[0037] In Example 3, the amount of methyltrimethoxysilane was reduced to 12 parts, but the amount of silica sol was increased to 27 parts, the amount of mixture B was as high as 78 parts, and the amount of perfluoropolyether was 1.5 parts. In this ratio, the relatively small amount of methyltrimethoxysilane resulted in a moderate length of organosilicon segments in the hybrid network, while the higher proportion of acidic silica sol introduced a large number of nano-silica particles. These particles are embedded in the network through chemical bonds, which not only significantly improve the hardness (while maintaining 9H) as a rigid framework, but also increase the light transmittance to 97% due to their high light transmittance and small size effect (no aggregation). At the same time, the grafting points of perfluoropolyether are fully exposed on the surface in the moderately cross-linked network, and the abundant silanol groups on the surface of silica sol provide more anchoring points for perfluoropolyether. This synergistic effect significantly increases the contact angle of the artificial fingerprint liquid to 102°. This indicates that there is an optimal window for the synergy of the three: appropriately reducing the amount of organosilicon precursor, increasing the amount of inorganic nanophase, and adjusting the amount of perfluoropolyether can significantly improve oleophobicity without sacrificing hardness.
[0038] In Comparative Example 1, only 5 parts of methyltrimethoxysilane were used, resulting in severely insufficient crosslinking ability of mixture A. Although 13 parts of mixture A and 15 parts of silica sol were subsequently added, the overall organosilicon network density was too low, and the silica sol could not be effectively bonded and fixed, leading to a lack of a strong Si-O-Si inorganic reinforcing network inside the coating. After curing, the coating structure was loose, with poor mechanical strength and a hardness of only 6H. At the same time, the loose structure caused increased light scattering, reducing the light transmittance to 83%. Although only 1 part of perfluoropolyether was used, its grafting efficiency was low and its surface distribution was uneven due to the incomplete network, resulting in a contact angle of only 87°. The three components failed synergistically: insufficient methyltrimethoxysilane could not build a framework, the inorganic phase of silica sol could not fully exert its reinforcing effect, and the perfluoropolyether also lacked effective chemical anchoring.
[0039] In Comparative Example 2, the amount of methyltrimethoxysilane was restored to 15 parts, but the amount of silica sol surged to 50 parts (compared to only 12 parts of mixture A and 50 parts of silica sol in mixture B). This resulted in an extremely high content of inorganic nanoparticles and a relatively insufficient organosilicon network in the mixture. The high silica sol content easily agglomerates during curing, generating microcracks and scattering centers, causing a sharp drop in transmittance to 64%, while simultaneously increasing the coating's brittleness and hardness to only 3H. Interestingly, the contact angle reached a high of 112°. This is because the surface of the excess silica sol contains a large number of unreacted silanol groups, which interact strongly with the perfluoropolyether. However, the curing temperature dropped to 80°C and the time was only 1 hour, leading to insufficient condensation and migration of the perfluoropolyether, instead forming an uneven fluorine-rich layer on the surface. Although the local contact angle was high, the overall mechanical and optical properties of the coating were extremely poor. Furthermore, insufficient curing also exacerbated the decrease in hardness. This indicates that an excess of inorganic phase and a mismatched curing process can disrupt the ternary synergistic balance.
[0040] In Comparative Example 3, 15 parts of methyltrimethoxysilane were used, but the amount of acetic acid was increased to 5 parts (compared to 2-3 parts in other comparative examples). The excessive hydrolysis of mixture A led to rapid condensation of methyltrimethoxysilane, forming large-particle-size siloxane aggregates. When mixed with 40 parts of silica sol, the aggregates showed poor compatibility with the nanoparticles, resulting in phase separation. Mixture B contained 62 parts of perfluoropolyether and 1 part of fluoropolyether, cured for 1 hour. Due to the excessive hydrolysis in the early stages, the aggregates disrupted the uniform hybrid network, resulting in microscopic defects within the coating, a hardness of only 5H, and a light transmittance of 83%. Simultaneously, the perfluoropolyether was difficult to effectively graft onto the uneven surface, and was even partially embedded, causing the contact angle to drop to 76°. Excessive acetic acid disrupted the hydrolysis-condensation kinetic balance, causing a loss of good chemical synergy between methyltrimethoxysilane and silica sol, ultimately resulting in performance inferior to the examples.
[0041] The coating prepared in Example 3 was subjected to adhesion testing according to GB / T 5210-2006 "Paints and Varnishes - Pull-off Adhesion Test". The adhesion test results are as follows: Figure 2 As shown.
[0042] Depend on Figure 2 It can be seen that the coating exhibits significant differences in adhesion on different substrates. The highest adhesion strength is observed on iron substrates (3150 kPa), followed by glass substrates (1550 kPa). This is attributed to the formation of strong Si-O-Fe or Si-O-Si chemical bonds between the silanol groups generated by the hydrolysis of methyltrimethoxysilane and the silanol groups on the iron surface oxide layer or glass surface. At the same time, the introduction of acidic silica sol further increases the interfacial anchoring points, verifying the design intention of the ternary synergistic system to achieve strong adhesion through chemical bonds. However, the adhesion to low surface energy or easily passivated substrates such as aluminum (300 kPa), polypropylene (200 kPa), tin (300 kPa), and cement (750 kPa) is relatively low. This is mainly attributed to the lack of sufficient active functional groups or the presence of inert oxide films on these surfaces, which limits the formation of chemical bonds. Overall, the coating has excellent adhesion to mainstream substrates such as glass and iron, which is sufficient to meet the needs of major application scenarios such as consumer electronics and automotive metal parts.
[0043] A liquid slip test was conducted on the coating prepared in Example 3, and the results are shown in Figure 3. Figure 3It is evident that water, hexadecane, peanut oil, and artificial fingerprint liquid can all smoothly slide off the inclined coating surface without any visible residue. Among them, water, due to its highest surface tension and a coating contact angle of 102°, rolls off most thoroughly. Hexadecane and peanut oil, as low surface energy oily liquids, can also slide off as a whole without spreading or sticking due to the oleophobic properties of the coating. Artificial fingerprint liquid, as a complex mixture simulating human sweat and sebum, also exhibits good rolling and sliding behavior. This directly proves that the present invention, through the synergistic effect of the ternary interaction of methyltrimethoxysilane, acidic silica sol, and perfluoropolyether, successfully constructs a surface with low adhesion to both polar and non-polar liquids, achieving excellent anti-fingerprint and easy-to-clean performance.
[0044] Therefore, this invention employs the aforementioned fluorosilicone hybrid transparent anti-fingerprint coating and its preparation method. Through the synergistic effect of methyltrimethoxysilane, acidic silica sol, and perfluoropolyether, a fluorosilicone hybrid transparent anti-fingerprint coating with a gradient structure is constructed. This coating maintains extremely high optical transparency while also possessing excellent mechanical hardness and scratch resistance, overcoming the technical contradiction of traditional anti-fingerprint coatings that struggle to balance hardness and oleophobicity. The dense inorganic network at the bottom layer achieves strong adhesion to various substrates such as glass and metal through chemical bonding, avoiding the defect of easy peeling of fluorine coatings.
[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.
Claims
1. A fluorosilicone hybrid transparent anti-fingerprint coating, characterized in that: By weight, it includes the following raw materials: 10-30 parts methyltrimethoxysilane, 4-6 parts isopropanol, 2-3 parts acetic acid, 20-30 parts acidic silica sol, 1-2 parts perfluoropolyether, 10-15 parts fluorinated solvent, 15-30 parts butyl acetate, and 5-8 parts deionized water.
2. The fluorosilicone hybrid transparent anti-fingerprint coating according to claim 1, characterized in that: The fluorinated solvent is methoxynonfluorobutane or ethoxynonfluorobutane.
3. The method for preparing a fluorosilicone hybrid transparent anti-fingerprint coating as described in any one of claims 1-2, characterized in that: Includes the following steps: S1. Dissolve methyltrimethoxysilane in a mixed solution of deionized water and isopropanol, then add acetic acid and stir to obtain mixture A; S2. Mix mixture A and acidic silica sol, stir, and obtain mixture B; S3. Mix mixture B and perfluoropolyether, add fluorinated solvent and butyl acetate, adjust the solution to be clear and transparent, stir, and obtain the coating. S4. Apply the coating evenly to the substrate surface, let it stand, and then perform heat curing to obtain a fluorosilicone hybrid transparent anti-fingerprint coating.
4. The method for preparing a fluorosilicone hybrid transparent anti-fingerprint coating according to claim 3, characterized in that: In S1, the stirring temperature is room temperature, and the stirring time is 16 hours.
5. The method for preparing a fluorosilicone hybrid transparent anti-fingerprint coating according to claim 3, characterized in that: In S2, the stirring temperature is room temperature, the stirring time is 2 hours, and the mass ratio of mixture A to acidic silica sol is (1-3):(2-3).
6. The method for preparing a fluorosilicone hybrid transparent anti-fingerprint coating according to claim 3, characterized in that: In S3, the stirring temperature is room temperature, the stirring time is 24h, and the mass ratio of mixture B to perfluoropolyether is (60-80):(1-2).
7. The method for preparing a fluorosilicone hybrid transparent anti-fingerprint coating according to claim 3, characterized in that: In S4, the base material is either glass or metal.
8. The method for preparing a fluorosilicone hybrid transparent anti-fingerprint coating according to claim 3, characterized in that: In S4, the settling time is 30 minutes.
9. The method for preparing a fluorosilicone hybrid transparent anti-fingerprint coating according to claim 3, characterized in that: In S4, the thermosetting temperature is 100℃ and the thermosetting time is 2h.