Anti-glare and anti-reflection coating composition, preparation method thereof and anti-glare and anti-reflection inorganic coating film prepared therefrom

Abstract

The present invention discloses an anti-glare and anti-reflection coating composition, a preparation method thereof, and an anti-glare and anti-reflection inorganic coating prepared therefrom. The coating composition comprises component A and component B; in parts by weight, component A comprises 10-100 parts of an organosiloxane compound having a hydrolysis function, 0-30 parts of an alcohol solvent, 10-60 parts of an alcohol ether solvent, and 0.2-5 parts of an auxiliary agent; component B comprises 40-250 parts of a silica sol with an alcoholized surface and 0.1-5 parts of a catalyst; and the mass ratio of component A to component B in the coating composition is 1:0.1-10. The anti-glare and anti-reflection coating prepared using the coating composition of the present invention not only improves the coating transmittance, thereby increasing the resolution of the interface, but also has a matte appearance, can achieve an anti-glare effect, is suitable for long-term outdoor use, and has broad application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-glare and anti-reflection, and more specifically to an anti-glare and anti-reflection coating composition, a preparation method thereof, and an anti-glare and anti-reflection inorganic coating film prepared therefrom. Background Art

[0002] Coatings are a common surface modification method that can enhance, protect, and functionalize substrates. With the advancement of science and technology, functional coatings are increasingly recognized by researchers as the future of coatings. However, among the many functional coatings available, achieving technological breakthroughs in optically functional coatings is relatively difficult or challenging, primarily because light modulation requires precise control of many key factors to match light characteristics, such as wavelength. Therefore, in applications involving smaller substrates, such as lenses and mobile phone displays, specialized preparation techniques can be used to precisely control the coating thickness while fully controlling the purity of each coating component. This can achieve excellent optical properties, such as antireflection effects and color-changing anti-glare effects in eyeglass lenses. However, this process suffers from numerous issues, including low efficiency, size limitations, and high cost, making it unsuitable for large-scale industrial production and application. Currently, mainstream antireflection coatings utilize various foaming processes to achieve high transmittance and anti-glare effects. However, this approach makes controlling foaming difficult and increases process complexity, requiring additional steps such as water washing during the foaming or pore-forming process.

[0003] Anti-reflection and anti-glare are two unique optical functions with broad real-world applications. Many applications require both, such as outdoor human-machine interfaces or electronic product interfaces under ambient light. On the one hand, the interface requires high transmittance to increase resolution; on the other hand, it must also be able to eliminate glare from ambient light. However, achieving these two functions in the coatings industry presents a significant conflict. Anti-glare can be achieved by increasing the diffuse reflectance of the coating film, using various matting agents to achieve a matting effect and reduce glare. However, the addition of matting agents can lead to a sharp decrease in coating transparency. This is because the refractive index of the matting agent differs significantly from that of the film-forming resin, forming numerous interfaces within the coating. These interfaces deflect light, reducing coating transparency and ultimately reducing interface resolution. Directly manipulating the refractive index of all coating components can improve transparency, but this ultimately increases the intensity of specular reflection from the surface, leading to glare.

[0004] At the same time, with the continued expansion of intelligent technology, people are increasingly exposed to more and more human-computer interaction interfaces in their daily lives. The user-friendliness of these interfaces depends on many factors, but high resolution and anti-glare performance play a significant role. High resolution is closely related to the transmittance of the interface, while anti-glare performance is closely related to the intensity of diffuse reflection from the interface. Therefore, there is an urgent need to develop an anti-glare and anti-reflection coating composition for the preparation of durable, high-transmittance, anti-glare inorganic coatings. Summary of the Invention

[0005] To solve the above problems, the first object of the present invention is to provide an anti-glare and anti-reflection coating composition.

[0006] The second object of the present invention is to provide a method for preparing the coating composition as described above.

[0007] The third object of the present invention is to provide an anti-glare and anti-reflection inorganic coating.

[0008] In order to achieve the above first object, the present invention adopts the following technical solutions:

[0009] The present invention discloses an anti-glare and anti-reflection coating composition, characterized in that the coating composition comprises component A and component B;

[0010] In parts by weight, the component A comprises 10-100 parts of an organosiloxane compound having a hydrolysis function, 0-30 parts of an alcohol solvent, 10-60 parts of an alcohol ether solvent, and 0.2-5 parts of an auxiliary agent; the component B comprises 40-250 parts of a silica sol having an alcoholized surface and 0.1-5 parts of a catalyst;

[0011] The mass ratio of component A to component B in the coating composition is 1:0.1-10.

[0012] Furthermore, in parts by weight, the component A comprises 50-90 parts of an organosiloxane compound having a hydrolysis function, 5-15 parts of an alcohol solvent, 20-40 parts of an alcohol ether solvent, and 0.2-1 parts of an auxiliary agent; the component B comprises 60-90 parts of a silica sol having an alcoholized surface and 0.1-5 parts of a catalyst.

[0013] Furthermore, the mass ratio of component A to component B in the coating composition is 1:2-4.

[0014] Furthermore, the organic silicone compound accounts for 48-65 wt% in component A;

[0015] The silica in the silica sol with the surface subjected to alcoholization treatment accounts for 5-30 wt % of the coating composition.

[0016] Furthermore, the organosiloxane compound is selected from one or more of methyl orthosilicate, ethyl orthosilicate, methyltrimethoxysilane, methyltriethoxysilane, trimethoxyepoxysilane and dimethyldiethoxysilane.

[0017] Furthermore, the silica sol whose surface has been alcoholized contains regularly shaped spherical silica particles with a particle size of 5-20 nm.

[0018] Furthermore, the silica sol with alcoholized surface is selected from Levasil series products of Nouryon and Evonik Sivo series products.

[0019] Furthermore, the alcohol solvent is selected from short-chain alcohol solvents;

[0020] The alcohol ether solvent is selected from the low-carbon alcohol ether solvents of ethylene glycol and / or the low-carbon alcohol ether solvents of propylene glycol;

[0021] The catalyst is selected from one or more of sulfuric acid, nitric acid, hydrochloric acid, acetic acid and formic acid.

[0022] Furthermore, the auxiliary agent includes one or more of a leveling agent, an ultraviolet absorber, a tin catalyst, a titanium catalyst and a reducing agent.

[0023] In order to achieve the above second purpose, the present invention adopts the following technical solutions:

[0024] The present invention discloses a method for preparing the coating composition as described above, comprising the following steps:

[0025] Under stirring, the organosiloxane compound, alcohol solvent, alcohol ether solvent and auxiliary agent are added to the container, stirred for 15-20 minutes, and mixed evenly to obtain component A; the viscosity of component A is 10-2000 mPa·s / 23°C;

[0026] Under stirring, slowly add the catalyst to the silica sol with the surface alcoholized, stir for 15-20 minutes, mix evenly and test the pH to 2-3 to obtain component B;

[0027] Component A and component B are mixed in proportion to obtain the coating composition.

[0028] In order to achieve the third object, the present invention adopts the following technical solutions:

[0029] The invention discloses an anti-glare and anti-reflection inorganic coating film. At least one layer of the coating composition described above is coated on at least one surface of a substrate to obtain the inorganic coating film having both anti-glare and anti-reflection functions.

[0030] Furthermore, the anti-glare and anti-reflection inorganic coating film has a single image component and a uniform refractive index.

[0031] The beneficial effects of the present invention are as follows:

[0032] The present invention discloses an anti-glare and anti-reflection coating composition. By applying component A, containing a hydrolyzable organosiloxane compound, and component B, containing a silica sol with a surface alcoholization treatment, to a target substrate, and controlling the ratio of component A to component B, the morphology of the final coating can be modified, thereby enhancing its surface diffuse reflection intensity. Furthermore, because the system does not contain objects with different refractive indices, the coating can maintain a high transmittance. Experiments have shown that glass coated with the anti-glare and anti-reflection coating composition of this application has a 3-5% increase in transmittance compared to uncoated glass, and the coating's gloss (60°) is consistently below 25°, demonstrating excellent anti-glare effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The figure is a comparison of transmittance before and after coating the coating composition of Comparative Example 2 on a blank glass. DETAILED DESCRIPTION

[0034] In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with preferred embodiments and drawings. Those skilled in the art should understand that the following specific description is illustrative rather than restrictive and should not be used to limit the scope of protection of the present invention.

[0035] In the following examples, the components of the composition are explained in parts by weight as a general standard. Unless otherwise specified, for the sake of simplicity, the "parts" in the examples of the present invention have the same meaning as parts by weight.

[0036] In order to obtain a coating film that meets application requirements, the first aspect of the present invention provides an anti-glare and anti-reflection coating composition, the coating composition comprising component A and component B;

[0037] In parts by weight, the component A comprises 10-100 parts of an organosiloxane compound having a hydrolysis function, 0-30 parts of an alcohol solvent, 10-60 parts of an alcohol ether solvent, and 0.2-5 parts of an auxiliary agent; the component B comprises 40-250 parts of a silica sol having an alcoholized surface and 0.1-5 parts of a catalyst.

[0038] By controlling the addition amounts of component A and component B, the overall properties of the coating can be adjusted. In one embodiment, the mass ratio of component A to component B in the coating composition is 1:0.1-10; preferably, the mass ratio of component A to component B is 1:2-4; illustratively, the mass ratio of component A to component B in the coating composition can be 1:2, 1:2.5, 1:3, 1:3.5, 1:4, etc.

[0039] In terms of anti-glare, the existing technology mostly introduces silica with irregular morphology, or performs irregular modification on the surface of silica, and uses the concave-convex changes on the surface of silica to change its diffuse reflection state, thereby achieving the purpose of extinction. The silica sol selected by the present invention, which has been treated with alcohol, contains spherical silica particles with regular shape and high gloss. The way to change its diffuse reflection state is to control the proportion of silica in the silica sol in the coating composition, thereby controlling the distribution of silica spherical particles when the coating composition is applied to the surface of the substrate, creating changes in surface morphology, to achieve diffuse reflection state, and achieve anti-glare effect. Technicians control the formula of component A and component B and the ratio between component A and component B, in essence, to control the proportion of silica sol in the coating composition. In a specific embodiment, the silica sol with the surface treated with alcohol contains spherical silica particles with a particle size of 5-20nm, and the silica in the silica sol with the surface treated with alcohol accounts for 5-30wt% in the coating composition.

[0040] In terms of anti-reflection, the principle of the present invention is to control the refractive index of the film-forming material and the silica sol to be consistent. Specifically, the present invention uses organosiloxane compounds with hydrolysis function. The purpose is that these organosiloxane compounds will interweave into a silica network after hydrolysis. They also contain multiple silanol groups and have the same grafting groups as the silica sol with an alcohol-treated surface. Therefore, the substance formed after the reaction has the same refractive index as silica. Because light is not deflected, it can exhibit high transparency. The reason for not choosing other surface-treated silica, such as wax-treated silica, is that wax-treated silica and organosiloxane compounds do not match in refractive index. Light will be deflected in various ways in the coating, resulting in reduced transparency and whitening.

[0041] For example, the silica sol with alcoholized surface is selected from Nouryon Levasil series products and Evonik Sivo series products, such as Nouryon Levasil CT20 (particle size 20nm), Sivo110 (particle size 5-15 nm).

[0042] The film-forming substance in the coating composition is an organosiloxane compound with hydrolysis function, including but not limited to one or more of methyl orthosilicate, ethyl orthosilicate, methyltrimethoxysilane, methyltriethoxysilane, trimethoxyepoxysilane and dimethyldiethoxysilane.

[0043] Furthermore, the alcohol solvent is selected from short-chain alcohol solvents, such as one or more of methanol, ethanol and isopropanol; the alcohol ether solvent is selected from low-carbon alcohol ether solvents of ethylene glycol and / or low-carbon alcohol ether solvents of propylene glycol with higher boiling points; illustratively, the alcohol ether solvent can be propylene glycol methyl ether acetate (PMA), ethylene glycol monobutyl ether (BG), propylene glycol methyl ether, etc.

[0044] The catalyst is used to promote the rapid hydrolysis and / or polymerization of the organosiloxane compound; the catalyst is selected from inorganic acids such as sulfuric acid, nitric acid, and hydrochloric acid, or organic acids such as acetic acid and formic acid.

[0045] Furthermore, the additives in component A include 0.1-2 parts of a leveling agent and 0.1-3 parts of an additional additive; the additional additives include one or more of a UV absorber, a tin catalyst, a titanium catalyst, and a reducing agent; the leveling agent is selected from one or more of BYK300, BYK331, and BYK378; the UV absorber is selected from BASF TINUVIN 326 and / or BASF TINUVIN 312; the tin catalyst is selected from one or more of dibutyltin dilaurate, stannous octoate, and dibutyltin diacetate; and the titanium catalyst is selected from isopropyl titanate.

[0046] The second aspect of the present invention also provides a method for preparing the coating composition, comprising the following steps:

[0047] Under stirring, the organosiloxane compound, alcohol solvent, alcohol ether solvent and auxiliary agent are added to the container, stirred for 15-20 minutes, and mixed evenly to obtain component A; the viscosity of component A is 10-2000 mPa·s / 23°C;

[0048] Under stirring, slowly add the catalyst to the silica sol with the surface alcoholized, stir for 15-20 minutes, mix evenly and test the pH to 2-3 to obtain component B;

[0049] Component A and component B are mixed in proportion to obtain the coating composition.

[0050] The third aspect of the present invention also provides an anti-glare and anti-reflection inorganic coating film, that is, at least one layer of the coating composition as described above is coated on at least one surface of the target substrate, and after curing, an inorganic coating film having both anti-glare and anti-reflection functions is obtained.

[0051] Furthermore, the anti-glare and anti-reflection inorganic coating film has a single image component and a uniform refractive index.

[0052] Furthermore, the curing condition is curing at 150-210° C. for 2-30 min, preferably curing at 180° C. for 30 min.

[0053] Furthermore, the thickness of the anti-glare and anti-reflection coating is 2-5 μm.

[0054] The following will be further described through specific examples.

[0055] Examples 1-4

[0056] Examples 1-4 provide anti-glare and anti-reflection coating compositions 1-4, which include component A and component B. The compositions of component A and component B are as follows, in parts by weight:

[0057] Table 1 Composition of component A in coating compositions 1-4

[0058] Components name Number of copies MTES Methyltriethoxysilane 60 TEOS Tetraethyl orthosilicate 0.5 GLYMO Trimethoxyepoxysilane 10 Ethanol Anhydrous ethanol 10 PMA Propylene glycol methyl ether acetate 30 BYK300 BYK300 0.1 DBTDL Organotin 0.1

[0059] Table 2 Composition of component B in coating compositions 1-4

[0060] Components name Number of copies Levasil CT20 Silica sol with alcoholized surface 70 <![CDATA[HNO3]]> Nitric acid 0.1

[0061] The specific steps of the preparation method and application of the above-mentioned anti-glare and anti-reflection coating compositions 1-4 are as follows:

[0062] (1) Add methyltriethoxysilane, ethyl orthosilicate, trimethoxyepoxysilane, anhydrous ethanol, PMA, BYK300, and DBTDL to the main container in sequence while stirring. Stir for 15-20 minutes at a stirring rate of 500-1500 rpm until uniformly mixed to obtain component A. The viscosity of component A is 150 mPa·s (23°C).

[0063] (2) Nitric acid is added dropwise to the silica sol whose surface has been alcoholized under stirring, and the mixture is stirred for 10-20 minutes at a stirring rate of 500-1500 rpm. The pH value is tested. When the pH value is in the range of 2.0-3.0, component B is obtained.

[0064] (3) When used, component A and component B are fully mixed in a weight ratio of 1:0.2, 1:0.8, 1:1, or 1:2 to obtain the coating compositions 1-4.

[0065] The coating compositions 1-4 were coated on a glass substrate (glass slide, for optical characterization) and a stainless steel substrate (for mechanical property characterization), respectively, and cured at 210° C. for 2 min to obtain anti-glare and anti-reflection inorganic coatings 1-4, which were then subjected to performance testing.

[0066] The physical properties of the anti-glare and anti-reflection inorganic coatings are shown in Table 3 below. As can be seen from Table 3, the prepared anti-glare and anti-reflection inorganic coatings 1-4 exhibit excellent hardness, water resistance, chemical resistance, flexibility, and adhesion to substrates. This ensures the long-term outdoor use of the anti-glare and anti-reflection inorganic coatings of the present invention. Furthermore, the resulting coatings exhibit an anti-glare effect with a gloss range of 1 to 25 degrees (at a 60-degree angle).

[0067] Table 3 Properties of the anti-glare and anti-reflection inorganic coatings described in Examples 1-4

[0068]

[0069]

[0070] Note: SiO2 content (%) refers to the percentage of silica in the surface-alcoholized silica sol in the coating composition. Transparency (500nm) / slide refers to the transparency of the slide after coating / before coating. The transparency before coating is the transparency of the slide itself, the same below.

[0071] The test method is as follows:

[0072] Pencil hardness: Determine the paint film hardness with reference to GBT 6739-2006 Paints and varnishes pencil method.

[0073] MEK rub resistance: Refer to GB / T 23989-2009 Determination of solvent rub resistance of coatings.

[0074] T-bend: Refer to ASTM D 2794-93 (2019).

[0075] Boiling resistance (1h): Place the sample in deionized water and boil it for 1h, then take it out for testing.

[0076] Gloss (60°): Refer to GB / T 9754-2007 BYK-4430 gloss meter.

[0077] Transparency: tested using UV spectrophotometer.

[0078] Examples 5-7

[0079] Example 5-7 provides an anti-glare and anti-reflection coating composition 5-7, wherein the anti-glare and anti-reflection coating composition 5-7 includes component A and component B. The compositions of component A and component B are as follows, in parts by weight:

[0080] Table 4 Composition of component A in coating compositions 5-7

[0081] Components name Number of copies MTMS Methyltrimethoxysilane 40 GLYMO Trimethoxyepoxysilane 10 IPA Isopropyl alcohol 10 BG Ethylene glycol monobutyl ether 40 BYK300 BYK300 0.1 DBTDL Organotin 0.1

[0082] Table 5 Composition of component B in coating compositions 5-7

[0083]

[0084] The specific steps of the preparation method and application of the above-mentioned anti-glare and anti-reflection coating compositions 5-7 are as follows:

[0085] (1) Under stirring, add methyltrimethoxysilane, trimethoxyepoxysilane, isopropyl alcohol, BG, BYK300, and DBTDL to the main container in sequence. Stir for 15-20 minutes at a stirring rate of 500-1500 rpm until the mixture is uniformly mixed to obtain component A. The viscosity of component A is 100 mPa·s (23°C).

[0086] (2) Under stirring, add the mixed Levasil CT20 and Nitric acid was added dropwise to Sivo110 and stirred for 10-20 min at a stirring rate of 500-1500 rpm. The pH value was tested. When the pH value was within the range of 2.0-3.0, component B was obtained.

[0087] (3) When in use, component A and component B are fully mixed in a weight ratio of 1:5, 1:0.2, or 1:1 to obtain the anti-glare and anti-reflection coating composition 5-7.

[0088] The anti-glare and anti-reflection coating compositions 5-7 were coated on a glass substrate (glass slide, for optical characterization) and a stainless steel substrate (for mechanical property characterization), respectively, and cured at 150° C. for 30 min to obtain anti-glare and anti-reflection inorganic coating films 5-7, which were then subjected to performance testing.

[0089] The physical properties of the above-mentioned anti-glare and anti-reflection inorganic coating are shown in Table 6 below.

[0090] Table 6 Properties of the anti-glare and anti-reflection inorganic coatings described in Examples 5-7

[0091]

[0092]

[0093] Examples 8-9

[0094] This embodiment 8-9 provides an anti-glare and anti-reflection coating composition 8-9, which includes component A and component B. The compositions of component A and component B are as follows, in parts by weight:

[0095] Table 7 Composition of component A in coating compositions 8-9

[0096] Components name Number of copies MTES Methyltriethoxysilane 50 GLYMO Trimethoxyepoxysilane 10 BG Ethylene glycol monobutyl ether 30 BYK300 BYK300 0.1 IPA Isopropyl alcohol 10 Isopropyl titanate Organic titanium 0.1

[0097] Table 8 Composition of component B in coating compositions 8-9

[0098]

[0099] The specific steps of the preparation method and application of the above-mentioned anti-glare and anti-reflection coating compositions 8-9 are as follows:

[0100] (1) Under stirring, add methyltriethoxysilane, trimethoxyepoxysilane, isopropyl alcohol, isopropyl titanate, BG, and BYK300 to the main container in sequence. Stir for 15-20 minutes at a stirring rate of 500-1500 rpm until the mixture is uniformly mixed to obtain component A. The viscosity of component A is 140 mPa·s (23°C).

[0101] (2) Under stirring, add the mixed Levasil CT20 and Add acetic acid dropwise to Sivo110 and stir for 10-20 minutes at a stirring rate of 500-1500 rpm. Test the pH value. When the pH value is in the range of 2.0-3.0, component B is obtained.

[0102] (3) When in use, component A and component B are fully mixed at a weight ratio of 1:1 and 1:3 to obtain the anti-glare and anti-reflection coating composition 8-9.

[0103] The anti-glare and anti-reflection coating compositions 8-9 were coated on a glass substrate (glass slide, optical characterization) and a stainless steel substrate (mechanical property characterization), respectively, and cured at 150° C. for 30 min to obtain anti-glare and anti-reflection inorganic coating films 8-9, which were then subjected to performance testing.

[0104] The properties of the resulting anti-glare and anti-reflection inorganic coating are shown in Table 9. As can be seen from this table, glass coated with the anti-glare and anti-reflection inorganic coating exhibits higher transmittance than a blank glass substrate, with an increase in transmittance of 3-5%. The resulting coating exhibits a gloss level below 25 degrees (at a 60-degree angle). Therefore, the anti-glare and anti-reflection inorganic coating not only enhances transmittance but also provides an anti-glare function. Mechanical properties also demonstrate that the present invention provides weather resistance for extended outdoor use.

[0105] Table 9 Properties of the anti-glare and anti-reflection inorganic coatings described in Examples 8-9

[0106]

[0107] Comparative Example 1

[0108] Comparative Example 1 provides a coating composition D1 having an anti-glare effect but no anti-reflection effect. The coating composition D1 has the following composition in parts by weight:

[0109] Table 10 Composition of coating composition D1

[0110] Components name Number of copies MTES Methyltriethoxysilane 50 GLYMO Trimethoxyepoxysilane 10 BG Ethylene glycol monobutyl ether 30 BYK333 BYK333 0.1 IPA Isopropyl alcohol 10 DBTDL Organotin 0.1 Grace ED30 Silica with organic wax treatment on the surface 7.0 HAC acetic acid 2

[0111] The specific steps of the preparation method and application of the coating composition D1 are as follows:

[0112] (1) Add methyltriethoxysilane, trimethoxyepoxysilane, isopropyl alcohol, DBTDL, BG, and BYK333 to the main container in sequence while stirring. Stir for 15-20 minutes at a stirring rate of 500-1500 rpm to ensure uniform mixing. The viscosity of the mixture at 23°C is 150 mPa·s.

[0113] (2) Silica (Grace's ED30) was slowly added to the above mixture, and acetic acid was added dropwise under stirring. The mixture was stirred for 30 to 60 minutes at a stirring rate of 500 to 1500 rpm. The pH value was tested. When the pH value was in the range of 2.0 to 3.0, the coating composition D1 was obtained.

[0114] (3) The coating composition D1 was applied to a glass substrate (glass slide) and cured at 150° C. for 30 min before conducting appearance and performance tests.

[0115] The resulting sample exhibited a relatively uniform appearance, with a glossiness of 8 degrees (at a 60-degree angle), a distinct matte finish and excellent anti-glare properties. However, the coating's overall slightly whitish appearance resulted in significant variations in its overall transmittance. Testing revealed a reduction in transparency of approximately 30%, as shown in Table 11.

[0116] Table 11 Comparison of transmittance between comparative example 1 and substrate

[0117] Comparative Example 1 substrate slides Baking (chain oven) 37.5Hz / 210℃ 150℃ / 30min Gloss (60 degree angle) 8 Transparency (500nm) / slide 60 / 91 <![CDATA[SiO2 content (%)]]> 10

[0118] The results of Comparative Example 1 fully demonstrate that if the added silicon dioxide is not subjected to alcoholization treatment, the anti-glare and anti-reflection performance effects cannot be obtained simultaneously.

[0119] Comparative Example 2

[0120] Comparative Example 2 provides a coating composition 2 having high transmittance but no anti-glare effect and anti-reflection effect. The coating composition D2 comprises component A and component B. The compositions of component A and component B are as follows, in parts by weight:

[0121] Table 12 Composition of component A in coating composition D2

[0122] Components name Number of copies MTMS Methyltrimethoxysilane 50 GLYMO Trimethoxyepoxysilane 10 BG Ethylene glycol monobutyl ether 30 BYK333 BYK333 0.1 IPA Isopropyl alcohol 10 DBTDL Organotin 0.1

[0123] Table 13 Composition of component B in coating composition D2

[0124] Components name Number of copies Levasil CT20 Silica sol with alcoholized surface 10 <![CDATA[HNO3]]> Nitric acid 0.2

[0125] The specific steps of the preparation method and application of the coating composition D2 are as follows:

[0126] (1) Add methyltrimethoxysilane, trimethoxyepoxysilane, isopropyl alcohol, DBTDL, BG, and BYK333 to the main container in sequence while stirring. Stir for 15-20 minutes at a stirring rate of 500-1500 rpm until uniformly mixed to obtain component A. The viscosity of component A is 150 mPa·s (23°C).

[0127] (2) Slowly add nitric acid to Levasil CT20 while stirring, and stir for 10-20 minutes at a stirring rate of 500-1500 rpm. Test the pH value. When the pH value is in the range of 2.0-3.0, component B is obtained.

[0128] (3) When in use, component A and component B are fully mixed in a weight ratio of 1:0.1 to obtain the coating composition 2.

[0129] The coating composition D2 was coated on a glass substrate (glass slide) and cured at 150° C. for 30 min before conducting a performance test.

[0130] The results are as follows Figure 1 As shown, it can be clearly seen that the obtained coating has a high transparency and its silica content is about 4%. However, the glossiness of the coating surface has exceeded 90 degrees, so it will produce a serious dazzling effect. At the same time, the transparency effect has not changed significantly (91 / 91%@500nm). Generally, applying a layer of coating on a glass substrate will reduce the transmittance to a certain extent. Therefore, this experiment also shows that the coating film formed in Comparative Example 2 has a high transparency, showing a state of unchanged overall transparency, but it has no obvious anti-reflection properties because the coating surface cannot form a diffuse reflection effect. It can be seen that the final state of the surface must be controlled by controlling the silica content.

Claims

1. An anti-glare and anti-reflection coating composition, characterized in that: The coating composition comprises component A and component B; In parts by weight, the component A comprises 10-100 parts of an organosiloxane compound having a hydrolysis function, 0-30 parts of an alcohol solvent, 10-60 parts of an alcohol ether solvent, and 0.2-5 parts of an auxiliary agent; the component B comprises 40-250 parts of a silica sol having an alcoholized surface and 0.1-5 parts of a catalyst; The mass ratio of component A to component B in the coating composition is 1:0.1-10; the silicon dioxide in the silicon dioxide sol with the surface subjected to alcoholization treatment accounts for 5-30wt% of the coating composition.

2. The coating composition according to claim 1, wherein In parts by weight, the component A comprises 50-90 parts of an organosiloxane compound having a hydrolysis function, 5-15 parts of an alcohol solvent, 20-40 parts of an alcohol ether solvent, and 0.2-1 parts of an auxiliary agent; the component B comprises 60-90 parts of a silica sol having an alcoholized surface and 0.1-5 parts of a catalyst.

3. The coating composition according to claim 1, wherein The mass ratio of component A to component B in the coating composition is 1:2-4.

4. The coating composition according to claim 1, wherein The organic silicone compound accounts for 48-65 wt % of the component A.

5. The coating composition according to claim 1, wherein The organosiloxane compound is selected from one or more of methyl orthosilicate, ethyl orthosilicate, methyltrimethoxysilane, methyltriethoxysilane, trimethoxyepoxysilane and dimethyldiethoxysilane.

6. The coating composition according to claim 1, wherein The silica sol whose surface has been alcoholized contains spherical silica particles with regular shapes and a particle size of 5-20 nm.

7. The coating composition according to claim 1, wherein The silica sol with alcoholized surface is selected from Nouryon's Levasil series products and / or Evonik's Dynasylan® Sivo series products.

8. The coating composition according to claim 1, wherein The alcohol solvent is selected from short carbon chain alcohol solvents; The alcohol ether solvent is selected from the low-carbon alcohol ether solvents of ethylene glycol and / or the low-carbon alcohol ether solvents of propylene glycol; The catalyst is selected from one or more of sulfuric acid, nitric acid, hydrochloric acid, acetic acid and formic acid; The auxiliary agent includes one or more of a leveling agent, an ultraviolet absorber, a tin catalyst, a titanium catalyst and a reducing agent.

9. The method for preparing the coating composition according to any one of claims 1 to 8, wherein: The steps include: Under stirring, the organosiloxane compound, alcohol solvent, alcohol ether solvent and auxiliary agent are added to the container, stirred for 15-20 minutes, and mixed evenly to obtain component A; the viscosity of component A is 10-2000 mPa·s / 23°C; Under stirring, slowly add the catalyst to the silica sol with the surface alcoholized treatment, stir for 15-20 minutes, mix well and test the pH to 2-3 to obtain component B; Component A and component B are mixed in proportion to obtain the coating composition.

10. An anti-glare and anti-reflection inorganic coating film, characterized in that: At least one layer of the coating composition according to any one of claims 1 to 8 is coated on at least one surface of a substrate to obtain an inorganic coating film having both anti-glare and anti-reflection functions.

11. The anti-glare and anti-reflection inorganic coating according to claim 10, characterized in that: The anti-glare and anti-reflection inorganic coating film has a single image component and a uniform refractive index.

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