High-temperature-resistant anti-adhesion super-hard transparent fluorine-free green organic silicon coating and preparation method thereof

Abstract

The invention discloses a high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating and a preparation method thereof, and belongs to the technical field of organic silicon coatings. According to the invention, methyltrimethoxysilane, silica sol, hydroxyl silicone oil, isopropanol and water are used as raw materials to prepare a high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating, and a design strategy of manufacturing a nanoscale polysiloxane coating through an organic silicon precursor controllable sol-gel hydrolysis process is adopted. According to the present invention, the coating with the matrix completely composed of the in-situ generated nano SiO2 particles is prepared, the defect minimization and the highly-crosslinked Si-O-Si network structure are achieved, the nano-scale inorganic structure has long-term thermal stability, and the visible light transmittance of the coating can achieve 98% due to the inhibition of the light scattering by the sub-wavelength particle size; and tiny nano particles are uniformly and tightly arranged on the surface of the coating, so that the coating is endowed with ultrahigh hardness. In addition, the coating still maintains the inherent antifouling property of the organic silicon coating.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of silicone coating, and particularly relates to a high-temperature-resistant anti-adhesion super-hard transparent fluorine-free green silicone coating and a preparation method thereof. BACKGROUND

[0002] Silicone coating has been widely used in many fields due to its anti-fouling performance of repelling various pollutants. However, in some special high-temperature environments such as non-stick cookware, silicone coating cannot maintain good anti-fouling performance. The mainstream polytetrafluoroethylene (PTFE) system will undergo dangerous decomposition when the temperature exceeds 260 DEG C, which is often broken in necessary cooking techniques such as explosive frying or baking, releasing carcinogenic perfluorooctanoic acid (PFOA) and endocrine-interfering microplastics.

[0003] Although emerging sol-gel ceramic coatings (such as silicon-based coatings) eliminate the risk of fluorine-containing chemicals, their intrinsic brittleness and weak interfacial adhesion will lead to catastrophic delamination under thermal cycling and wear failure within 500 cycles of utensil scratching. This fragility is due to the fundamental limitation of material design: achieving mechanical strength (> 6H hardness) through high cross-linking density inevitably introduces light scattering defects, resulting in optical transparency below 85%, producing an undesirable frosted glass effect that affects durability and destroys the visual clarity of decorative patterns. To make matters worse, the continuous addition of perfluorinated compounds (PFCs) in commercial coatings directly violates increasingly stringent global regulations, such as the EU's 2023 ban on PFAS (perfluoroalkyl substances).

[0004] Therefore, there is an urgent need for a silicone coating with good long-term thermal stability, high visible light transmittance, high hardness, and excellent anti-fouling properties to solve the above technical problems. SUMMARY

[0005] To solve the above technical problems, the present application provides a high-temperature-resistant anti-adhesion super-hard transparent fluorine-free green silicone coating and a preparation method thereof. The present application provides a design strategy for a sustainable and excellent performance polytetrafluoroethylene coating alternative that meets food safety standards and has excellent cooking durability. At the same time, the transparent anti-fouling coating allows the decorative design of the pot substrate (such as the metallic luster of stainless steel or enamel color drawing) to be fully presented.

[0006] To achieve the above purpose, the present application provides the following technical solutions:

[0007] The present application provides a high-temperature-resistant anti-adhesion super-hard transparent fluorine-free green silicone coating, which comprises the following raw materials in parts by weight: methyltrimethoxysilane 40-80 parts, silica sol 50-80 parts, hydroxyl silicone oil 5-15 parts, isopropyl alcohol 10-15 parts, and water 5-25 parts.

[0008] Technical principles: The application uses methyltrimethoxysilane, silica sol, hydroxyl silicone oil, isopropyl alcohol and water as raw materials to prepare a high-temperature-resistant anti-adhesion super-hard transparent fluorine-free green silicone coating. Through the design strategy of the controllable sol-gel hydrolysis process of the organic silicon precursor, a coating composed of nano-SiO2 particles (2-20 nm) generated in situ is prepared, the defect minimization and highly cross-linked Si-O-Si network structure are realized, the nano-scale inorganic structure has long-term thermal stability, and the visible light transmittance of the coating can reach 98% due to the sub-wavelength particle size inhibiting light scattering. In addition, the uniform and close arrangement of the tiny nanoparticles on the surface of the coating gives the coating super-high hardness. In addition, the coating still maintains the inherent stain resistance of the organic silicone coating.

[0009] Further, the raw materials include the following weight parts: methyltrimethoxysilane 40-60 parts, silica sol 50-60 parts, hydroxyl silicone oil 5-10 parts, isopropyl alcohol 10-13 parts and water 5-15 parts.

[0010] Further, the SiO2 content of the silica sol is 40%, and the particle size is 5-20 nm.

[0011] Further, the hydroxyl content of the hydroxyl silicone oil is 40%.

[0012] Further, the water is deionized water.

[0013] Further, the matrix of the high-temperature-resistant anti-adhesion super-hard transparent fluorine-free green silicone coating is composed of SiO2 particles with a particle size of 2-20 nm.

[0014] The application provides a preparation method of the high-temperature-resistant anti-adhesion super-hard transparent fluorine-free green silicone coating.

[0015] Methyltrimethoxysilane, isopropyl alcohol and water are mixed, silica sol and hydroxyl silicone oil are added after stirring, and continuous stirring is carried out to obtain a coating mixture; the coating mixture is poured on a substrate, and heat curing is carried out to obtain the high-temperature-resistant anti-adhesion super-hard transparent fluorine-free green silicone coating.

[0016] Further, the stirring speed is 50-200 r / min, the stirring temperature is room temperature, and the stirring time is 4-12 h.

[0017] The continuous stirring temperature is room temperature, and the continuous stirring time is 15-72 h.

[0018] Further, the heat curing temperature is 150-300 DEG C, and the heat curing time is 40 min-2 h.

[0019] The application also provides application of the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating in a special high-temperature environment.

[0020] Compared with the prior art, the application has the following advantages and technical effects:

[0021] The high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating provided by the application is free of fluorine and has long-term thermal stability and will not release harmful substances at high temperatures; the coating also has high light transmittance and superhigh hardness, while maintaining the inherent stain resistance of the organic silicon coating, thus meeting the food safety standards and having excellent cooking durability, and the transparent stain-resistant coating also enables the decorative design of the cookware substrate (such as the metallic luster of stainless steel or enamel color drawing) to be completely presented. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which form a part of this application, are used to provide further understanding of the application, and the illustrative embodiments of the application and their description serve to explain the application. The accompanying drawings should not be considered undue limitations on the application, and the application is defined solely by the claims. In the drawings:

[0023] Figure 1 FIG. 1 is an X-ray photoelectron spectrogram of the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating in Example 1;

[0024] Figure 2 FIG. 2 is an SEM image of the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating in Example 1;

[0025] Figure 3 FIG. 3 is an infrared spectrogram of the mixture 1, the mixture 2 and the coating mixture in Example 1;

[0026] Figure 4 FIG. 4 is the friction coefficient and the friction coefficient after high-temperature treatment of the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating in Example 1;

[0027] Figure 5 FIG. 5 is the light transmittance and the light transmittance after high-temperature treatment of the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating in Example 1;

[0028] Figure 6 FIG. 6 is the nanoindentation curve and the nanoindentation curve after high-temperature treatment of the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating in Example 1;

[0029] Figure 7 FIG. 7 is the friction coefficient of the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating in Example 2;

[0030] Figure 8 FIG. 8 is the light transmittance of the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating in Example 2;

[0031] Figure 9 This is the nanoindentation curve of the high-temperature resistant, anti-adhesive, ultra-hard, transparent, fluorine-free green organosilicon coating in Example 2;

[0032] Figure 10 is the friction coefficient of the high-temperature resistant, anti-adhesive, ultra-hard, transparent, fluorine-free green organosilicon coating in Example 3;

[0033] Figure 11 is the light transmittance of the high-temperature resistant, anti-adhesive, ultra-hard, transparent, fluorine-free green organosilicon coating in Example 3;

[0034] Figure 12 This is the nanoindentation curve of the high-temperature resistant, anti-adhesion, ultra-hard, transparent, fluorine-free green silicone coating in Example 3. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] The invention provides a high-temperature resistant, anti-adhesion, ultra-hard, transparent, fluorine-free green organic silicone coating, which comprises the following raw materials in parts by weight: 40-80 parts of methyltrimethoxysilane, 50-80 parts of silica sol, 5-15 parts of hydroxy silicone oil, 10-15 parts of isopropyl alcohol and 5-25 parts of water.

[0038] The high-temperature-resistant, anti-adhesive, ultra-hard, transparent, fluorine-free green organosilicon coating provided by the present invention comprises, by weight, 40-80 parts, preferably 40-60 parts, of methyltrimethoxysilane. The use of methyltrimethoxysilane is crucial in the present invention. It ensures the formation of ultrahard particles during the reaction, increasing the hardness of the coating. Furthermore, the interaction between methyltrimethoxysilane and water addresses the coating's light transmittance and achieves transparency.

[0039] The present invention's high-temperature-resistant, anti-adhesive, ultra-hard, transparent, fluorine-free, green organosilicon coating comprises 50-80 parts, preferably 50-60 parts, of silica sol, based on 40-80 parts by weight of methyltrimethoxysilane. The silica sol in the present invention, in combination with other raw materials, can further enhance the hardness of the coating, achieving an ultra-high hardness.

[0040] In a preferred embodiment, the SiO2 content of the silica sol is 40%, and the particle size is 5-20 nm.

[0041] The high-temperature-resistant anti-adhesion super-hard transparent fluorine-free green silicone coating of the present application comprises 5-15 parts of hydroxyl silicone oil, further preferably 5-10 parts, based on the amount of 40-80 parts by weight of methyltrimethoxysilane. The hydroxyl silicone oil in the present application cooperates with methyltrimethoxysilane and water to make the coating have the effect of preventing adhesion of various liquids and solids, solve the problem of pot sticking of cookware coating, and achieve the effect of non-stickiness.

[0042] In a preferred embodiment, the hydroxyl content of the hydroxyl silicone oil is 40%.

[0043] The high-temperature-resistant anti-adhesion super-hard transparent fluorine-free green silicone coating of the present application comprises 10-15 parts of isopropanol, further preferably 10-13 parts, based on the amount of 40-80 parts by weight of methyltrimethoxysilane. The isopropanol in the present application serves as a solvent.

[0044] The high-temperature-resistant anti-adhesion super-hard transparent fluorine-free green silicone coating of the present application comprises 5-25 parts of water, further preferably 5-15 parts, based on the amount of 40-80 parts by weight of methyltrimethoxysilane; the water is deionized water.

[0045] In a preferred embodiment, the matrix of the high-temperature-resistant anti-adhesion super-hard transparent fluorine-free green silicone coating is composed of SiO2 particles with a particle size of 2-20 nm.

[0046] The present application provides a preparation method of the high-temperature-resistant anti-adhesion super-hard transparent fluorine-free green silicone coating as described in the above technical solution, comprising the following steps:

[0047] Methyltrimethoxysilane, isopropanol and water are mixed, and after stirring, silica sol and hydroxyl silicone oil are added, and continuous stirring is performed to obtain a coating mixture; the coating mixture is poured on a substrate, and heat curing is performed to obtain the high-temperature-resistant anti-adhesion super-hard transparent fluorine-free green silicone coating.

[0048] In a preferred embodiment, before the silica sol and the hydroxyl silicone oil are added, a step of pre-mixing the silica sol and the hydroxyl silicone oil is further included; by pre-mixing the silica sol and the hydroxyl silicone oil together before adding, the anti-fouling ability of the coating can be improved.

[0049] In a preferred embodiment, the stirring speed is 50-200 r / min, further preferably 80-150 r / min; the stirring temperature is room temperature; and the stirring time is 4-12 h, further preferably 6-10 h.

[0050] In preferred embodiments, the temperature of the continued stirring is room temperature, and the time of the continued stirring is 15-72h, further preferably 24-72h. By controlling the temperature and time of the continued stirring, the present application ensures the transparency of the coating.

[0051] In preferred embodiments, the thickness of the casting is 20-40μm.

[0052] In preferred embodiments, the substrate is selected from a glass plate or a tin plate.

[0053] In preferred embodiments, the temperature of the thermal curing is 150-300℃, and the time of the thermal curing is 40min-2h.

[0054] The present application also provides a use of the high-temperature-resistant anti-adhesion ultra-hard transparent fluorine-free green organic silicon coating as described above in a special high-temperature environment. The special high-temperature environment includes aerospace, high-temperature industrial reactors, or special protective equipment.

[0055] In the embodiments of the present application, room temperature refers to "25±2℃".

[0056] In the embodiments of the present application, the raw materials are all purchased through market channels unless otherwise specified.

[0057] In the following embodiments, the performance test methods are as follows:

[0058] 1. Coefficient of friction: MXD-02 friction coefficient instrument of Jinan Saicheng Instrument was used, the load was 200g, and the speed was pulled at 100mm / min.

[0059] 2. Transmittance: the transmittance spectrum of the coating was measured in the range of 400-800nm by using an ultraviolet-visible spectrophotometer (Varian Cary 7000 spectrophotometer), with bare glass as the reference.

[0060] 3. Hardness: nanoindentation test was performed at 25℃ by using a nanoindentation machine (Bruker Hysitron TI980) equipped with a Berkovich diamond tip. In each force loading, holding and unloading cycle, the maximum load was 1000μN, and the loading and unloading rates were both 100μN / s. Oliver Pharr method was used to calculate the nanoindentation hardness and effective Young's modulus.

[0061] 4. Water contact angle: contact angle measurement instrument (JC2000A) was used to measure the contact angle (CAs), and the volume of the liquid drop (water) was 5μL.

[0062] 5. Anti-sticking effect: According to the ca of water and n-hexadecane on the surface of the glass plate coated with the fluorine-free green silicone coating and the ca of the uncoated glass plate, the surface energy of the glass plate coated with the coating is calculated, and the surface energy of the uncoated glass plate is 54.66 mJ / m 2 .

[0063] 6. High temperature test: The coating is tested after being subjected to short-term (1 h) extreme temperature treatment at 400℃ and 500℃.

[0064] Example 1

[0065] A high-temperature-resistant anti-sticking super-hard transparent fluorine-free green silicone coating is composed of the following raw materials in parts by weight: methyltrimethoxysilane 40 parts, silica sol 50 parts, hydroxyl silicone oil 5 parts, isopropyl alcohol 10 parts, and deionized water 5 parts; wherein the SiO2 content of the silica sol is 40%, and the particle size is 5-20 nm; the hydroxyl content of the hydroxyl silicone oil is 40%;

[0066] The preparation method of the above-mentioned high-temperature-resistant anti-sticking super-hard transparent fluorine-free green silicone coating is as follows: methyltrimethoxysilane and isopropyl alcohol are mixed with water, stirred at a speed of 100 r / min for 7 h to obtain a mixture 1; a mixture (previously mixed and stirred uniformly, mixture 2) of hydroxyl silicone oil and silica sol is added to the obtained mixture 1, and stirring is continued at room temperature for 1 day to obtain a coating mixture; the obtained coating mixture is poured onto a glass plate, the pouring thickness is 20 μm, and the coating is heat-cured at 300℃ for 40 min to obtain a high-temperature-resistant anti-sticking super-hard transparent fluorine-free green silicone coating.

[0067] Figure 1 It is an X-ray photoelectron spectrum of the high-temperature-resistant anti-sticking super-hard transparent fluorine-free green silicone coating in Example 1. From Figure 1 It can be seen that the coating forms a stable silicon crosslinked network.

[0068] Figure 2 It is an SEM image of the high-temperature-resistant anti-sticking super-hard transparent fluorine-free green silicone coating in Example 1. From Figure 2 It can be seen that the high-temperature-resistant anti-sticking super-hard transparent fluorine-free green silicone coating in Example 1 is smooth and uniform.

[0069] Figure 3 It is an infrared spectrum of the mixture 1, mixture 2 and coating mixture in Example 1, Figure 3 In which, the prepolymer represents the coating mixture, particle 1 represents the mixture 1, and particle 2 represents the mixture 2. From Figure 3 It can be seen that the silicone coating is successfully synthesized with methyltrimethoxysilane, silica sol, hydroxyl silicone oil, isopropyl alcohol and deionized water as raw materials.

[0070] Figure 4The friction coefficient of the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating in Example 1 and the friction coefficient after high-temperature treatment are shown in Table 1. Figure 4 As can be seen, the friction coefficient of the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating in Example 1 is about 0.2, and after high-temperature treatment at 400°C and 500°C, the friction coefficient does not change significantly, indicating that the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating provided by the present application has excellent high-temperature resistance, and further proves the stability of the smoothness of the coating surface.

[0071] Figure 5 The light transmittance of the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating in Example 1 and the light transmittance after high-temperature treatment are shown in Table 2. Figure 5 As can be seen, the light transmittance of the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating in Example 1 is about 98%, and at 400°C, the visible light transmittance of the coating is maintained at more than 92%, and at 500°C, although there is a decrease, the light transmittance is still maintained at more than 87%, which does not affect the display of the pattern under the coating, indicating that the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating provided by the present application has high light transmittance and excellent high-temperature resistance.

[0072] Figure 6 The nanoindentation curve of the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating in Example 1 and the nanoindentation curve after high-temperature treatment are shown in Table 3. Figure 6 According to the curve in Table 3, the nanoindentation hardness and effective Young's modulus of the coating were calculated using the Oliver Pharr method, and the results showed that the hardness of the coating at room temperature was 13.32 GPa, the hardness of the coating at 400°C was 12.82 GPa, and the hardness of the coating at 500°C was 25.47 GPa; the modulus of the coating at room temperature was 1.62 GPa, the modulus of the coating at 400°C was 1.75 GPa, and the modulus of the coating at 500°C was 3.21 GPa. It can be seen that high-temperature treatment not only does not cause undesirable changes in the hardness and modulus of the coating, but also significantly improves the hardness of the coating, indicating that the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating provided by the present application has high-temperature resistance and durable mechanical resilience.

[0073] Example 2

[0074] A high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating is composed of the following raw materials by weight: methyltrimethoxysilane 80 parts, silica sol 80 parts, hydroxy silicone oil 15 parts, isopropyl alcohol 15 parts, and deionized water 25 parts; wherein the SiO2 content of the silica sol is 40%, and the particle size is 5-20 nm; the hydroxy silicone oil has a hydroxyl content of 40%;

[0075] The preparation method of the above-mentioned high-temperature resistant, anti-adhesion, ultra-hard, transparent, fluorine-free green silicone coating is as follows: methyltrimethoxysilane and isopropyl alcohol are mixed with water, and stirred at a speed of 100 r / min for 10 hours to obtain mixture 1; a mixture of hydroxyl silicone oil and silica sol (pre-mixed and stirred evenly, mixture 2) is added to the obtained mixture 1, and stirring is continued at room temperature for 1 day to obtain a coating mixture; the obtained coating mixture is poured onto a glass plate with a pouring thickness of 40 μm, and thermally cured at 180°C for 40 minutes to obtain a high-temperature resistant, anti-adhesion, ultra-hard, transparent, fluorine-free green silicone coating.

[0076] Figure 7 is the friction coefficient of the high temperature resistant anti-adhesion ultra-hard transparent fluorine-free green organic silicone coating in Example 2. Figure 7 It can be seen that the friction coefficient of the high-temperature resistant, anti-adhesion, ultra-hard, transparent, fluorine-free green silicone coating in Example 2 is about 0.2, indicating that the coating has excellent friction resistance.

[0077] Figure 8 is the light transmittance of the high temperature resistant, anti-adhesive, ultra-hard, transparent, fluorine-free green organic silicone coating in Example 2. Figure 8 It can be seen that the light transmittance of the high-temperature resistant, anti-adhesion, ultra-hard, transparent, fluorine-free green organic silicone coating in Example 2 is about 98%, indicating that the coating has excellent light transmittance and can achieve a transparent effect.

[0078] Figure 9 This is the nanoindentation curve of the high temperature resistant, anti-adhesive, ultra-hard, transparent, fluorine-free green organic silicone coating in Example 2. Figure 9 It can be seen that the high temperature resistant, anti-adhesive, ultra-hard, transparent, fluorine-free green organic silicone coating in Example 2 has long-lasting mechanical resilience. Figure 9 The nanoindentation hardness and effective Young's modulus of the coating were calculated using the Oliver Pharr method. The results showed that the hardness of the coating was 11.84 GPa and the modulus of the coating was 1.68 GPa at room temperature.

[0079] Example 3

[0080] A high-temperature resistant, anti-adhesive, ultra-hard, transparent, fluorine-free green organic silicone coating, comprising the following raw materials in parts by weight: 60 parts of methyltrimethoxysilane, 60 parts of silica sol, 10 parts of hydroxy silicone oil, 13 parts of isopropyl alcohol, and 15 parts of deionized water; wherein the silica sol has a SiO2 content of 40% and a particle size of 5-20 nm; and the hydroxy silicone oil has a hydroxyl content of 40%.

[0081] The preparation method of the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating is as follows: methyltrimethoxysilane and isopropyl alcohol are mixed with water, stirred at a speed of 100 r / min for 6 h to obtain a mixture 1; a mixture (previously mixed and stirred uniformly, mixture 2) of hydroxyl silicone oil and silica sol is added to the obtained mixture 1, and stirring is continued at room temperature for 1 day to obtain a coating mixture; the obtained coating mixture is poured on a glass plate, the pouring thickness is 30 μm, and the coating is heat-cured at 150 ℃ for 2 h to obtain the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating.

[0082] Figure 10 The friction coefficient of the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating in Example 3 is shown in Table 1. Figure 10 It can be seen that the friction coefficient of the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating in Example 3 is 0.25.

[0083] Figure 11 The light transmittance of the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating in Example 3 is shown in Table 1. Figure 11 It can be seen that the light transmittance of the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating in Example 3 is about 98%, which indicates that the coating has excellent light transmittance and can achieve a transparent effect.

[0084] Figure 12 The nanoindentation curve of the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating in Example 3 is shown in Table 1. Figure 12 It can be seen that the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating in Example 3 has a long-lasting mechanical resilience. According to the curve in Table 1, the nanoindentation hardness and effective Young's modulus of the coating are calculated by using the Oliver Pharr method, and the results show that the hardness of the coating at room temperature is 15.71 GPa, and the modulus of the coating is 1.64 GPa. Figure 12

[0085] The friction coefficient, light transmittance, water contact angle and surface energy of the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coatings prepared in Examples 1-3 are shown in Table 1.

[0086] Table 1

[0087]

[0088] It can be seen from Table 1 that the friction coefficient of the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating provided by the present application is 0.2-0.25, the light transmittance is 98%, the water contact angle is 93.576-105.356°, and the surface energy is 22.39-25.26 mJ / m 2 It can be seen from Table 1 that the friction coefficient of the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating provided by the present application is 0.2-0.25, the light transmittance is 98%, the water contact angle is 93.576-105.356°, and the surface energy is 22.39-25.26 mJ / m 2 , which indicates that the high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating provided by the present application has the characteristics of resistance to friction, high visible light transmittance and excellent stain resistance.

[0089] The above merely provides the preferred embodiment of the present application, and the protection scope of the present application is not limited thereto. Any modification or replacement within the technical scope disclosed by the present application can be easily conceived by those skilled in the art, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A high temperature resistant, anti-adhesive, ultra-hard, transparent, fluorine-free green silicone coating, characterized in that: The method comprises the following raw materials in parts by weight: 40-80 parts of methyltrimethoxysilane, 50-80 parts of silica sol, 5-15 parts of hydroxy silicone oil, 10-15 parts of isopropyl alcohol and 5-25 parts of water.

2. The high temperature resistant, anti-adhesion, ultra-hard, transparent, fluorine-free green organic silicone coating according to claim 1, characterized in that: The method comprises the following raw materials in parts by weight: 40-60 parts of methyltrimethoxysilane, 50-60 parts of silica sol, 5-10 parts of hydroxy silicone oil, 10-13 parts of isopropyl alcohol and 5-15 parts of water.

3. The high temperature resistant, anti-adhesion, ultra-hard, transparent, fluorine-free green organic silicone coating according to claim 1 or 2, characterized in that: The SiO2 content of the silica sol is 40%, and the particle size is 5-20 nm.

4. The high temperature resistant, anti-adhesion, ultra-hard, transparent, fluorine-free green organic silicone coating according to claim 1 or 2, characterized in that: The hydroxyl content of the hydroxy silicone oil is 40%.

5. The high temperature resistant, anti-adhesion, ultra-hard, transparent, fluorine-free green organic silicone coating according to claim 1, characterized in that: The water is deionized water.

6. The high temperature resistant, anti-adhesion, ultra-hard, transparent, fluorine-free green organic silicone coating according to claim 1, characterized in that: The matrix of the high-temperature resistant, anti-adhesion, ultra-hard, transparent, fluorine-free green organic silicon coating is composed of SiO2 particles with a particle size of 2-20 nm.

7. A method for preparing a high-temperature resistant, anti-adhesive, ultra-hard, transparent, fluorine-free green organic silicone coating according to any one of claims 1 to 6, characterized in that: The following steps are involved: Methyltrimethoxysilane, isopropyl alcohol and water are mixed, and after stirring, silica sol and hydroxy silicone oil are added, and stirring is continued to obtain a coating mixture; the coating mixture is poured on a substrate and thermally cured to obtain the high-temperature resistant, anti-adhesion, ultra-hard, transparent, fluorine-free green silicone coating.

8. The preparation method according to claim 7, characterized in that The stirring speed is 50-200 r / min, the stirring temperature is room temperature, and the stirring time is 4-12 h; The temperature for continuing stirring is room temperature, and the time for continuing stirring is 15-72 hours.

9. The preparation method according to claim 7, characterized in that The heat curing temperature is 150-300° C., and the heat curing time is 40 min-2 h.

10. Use of the high-temperature resistant, anti-adhesion, ultra-hard, transparent, fluorine-free green organic silicone coating according to any one of claims 1 to 6 in a special high-temperature environment.

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