Antifogging glass and method for producing the same

Abstract

The present application relates to a kind of anti-fog glass and its preparation method, it is characterized in that using silk screen printing equipment and the silk screen printing plate A and silk screen printing plate B matched therewith, the style and size of silk screen printing plate A,B are determined according to glass embossing face pattern structure and water-collecting film distribution position, silk screen printing plate A is used for printing coating hydrophobic area;Silk screen printing plate B is used for printing coating hydrophilic area;(1) to the surface of calendered glass in turn using water, ethanol cleaning, drying;(2) fixed calendered glass substrate on silk screen printing equipment, install silk screen printing plate A, adjust printing parameter, in the lower area of the embossing face protruding structure of calendered glass and non-protruding area printing hydrophobic film coating liquid HB, solidification film layer.The present application has the advantages that: preparation method is simple, easy to operate, under the combined action of hydrophilic area and hydrophobic area, the liquid drop on the surface of glass will not stay for a long time;Anti-fog glass 4 μL water drop rolling angle 0~10 °, the average transmittance in the range of 380~1100 nm is not less than 91.0%, and the haze is 0~5%.

Description

Technical Field

[0001] This invention belongs to the field of glass surface treatment technology, and relates to an anti-fog glass and its preparation method. Background Technology

[0002] Modern agricultural greenhouses widely use glass as a light-transmitting and heat-insulating material. When there is a large temperature difference between the internal and external environments, fogging can easily occur on the glass surface. Besides changing environmental conditions through ventilation and manual or mechanical wiping, using anti-fog glass is an effective solution to this problem. The main working principle of anti-fog glass is to coat its surface with a hydrophilic film. This allows water vapor to quickly spread into a uniform water film when it comes into contact with the glass surface under a large interfacial temperature difference, rather than condensing into tiny droplets. This helps reduce the obstruction of incident light by fogging, maintaining the clear transparency of the glass surface. However, relying on hydrophilic films to achieve glass anti-fog still has the following shortcomings in practical applications: For on-site coated anti-fog liquids, the anti-fog film formed has low adhesion, is easy to wipe off, and has a short effective period, so it can only be used for a short time; for anti-fog glass with pre-coated hydrophilic films, although the film layer has better hardness and durability than the former solution, the water film formed after water vapor condenses and spreads on it is difficult to remove quickly, but continues to adhere to the glass surface. After it dries, it will form water stains containing pollutants and dust, thus causing a greater cleaning burden and cost. Summary of the Invention

[0003] The purpose of this invention is to solve the problems existing in the prior art and to provide an anti-fog glass and its preparation method.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] An anti-fog glass, comprising rolled glass, characterized in that: a hydrophilic area is provided on the raised portion of the embossed surface of the rolled glass, and the remaining area is provided as a hydrophobic area, wherein the hydrophilic area and the hydrophobic area constitute a water-collecting film.

[0006] Under the combined effect of the chemical composition and surface structure of the film, the hydrophilic protrusions on the surface are prone to nucleation and condensation of water, while the hydrophobic regions are prone to desorption and collection of water droplets, causing them to roll off, thus achieving an anti-fogging effect.

[0007] Furthermore, the hydrophilic region is either uncoated or coated with a hydrophilic film, while the hydrophobic region is coated with a hydrophobic film.

[0008] Furthermore, the hydrophilic area is located at a position from 1 / 4 to 3 / 4 of the height of the protrusion to the top of the protrusion.

[0009] Furthermore, the unpatterned surface of the rolled glass is coated with an anti-reflective film.

[0010] A method for preparing anti-fog glass includes rolled glass, characterized by using screen printing equipment and screen printing plates A and B used in conjunction with it. The style and size of screen printing plates A and B are determined according to the pattern structure of the glass embossed surface and the distribution position of the water-collecting film. Screen printing plate A is used to print and coat the hydrophobic area; screen printing plate B is used to print and coat the hydrophilic area.

[0011] Includes the following steps:

[0012] (1) The surface of the rolled glass is cleaned with water and ethanol in sequence, and then dried;

[0013] (2) Fix the calendered glass substrate on the screen printing equipment, install the screen printing plate A, adjust the printing parameters, print the hydrophobic coating liquid HB on the lower part of the raised structure and the non-raised area of ​​the embossed surface of the calendered glass, and cure the film layer.

[0014] Further, the next step after step (2) is: (3) replace and install screen printing plate B, adjust the printing parameters, print hydrophilic film coating liquid HL on the raised structure of the embossed surface of the rolled glass, and cure the film layer.

[0015] Furthermore, in step (2), the screen printing plate A is made of a hydrophobic material, such as nylon screen, with a mesh count of 200-350.

[0016] Furthermore, in step (2), the coating liquid HB is one of thermoplastic solvent-based silicone acrylic resin coating liquid, thermosetting solvent-based silicone acrylic resin coating liquid, and emulsion-type silicone acrylic resin coating liquid, and its viscosity is adjusted to the range of 900~3500 mPa·s before use.

[0017] Furthermore, the screen printing plate B is made of a hydrophilic material, such as stainless steel wire mesh, with a mesh count of 200-350.

[0018] Furthermore, the coating liquid HL is a SiO2 sol with an average particle size of 5~30 nm and a solid content of 2%~5%.

[0019] This invention utilizes a microstructure array on the surface of rolled glass to prepare a water-collecting film on its surface, exhibiting alternating and adjacent distribution of hydrophilic and hydrophobic films in both the horizontal and vertical directions. Water droplets formed by the condensation of water vapor on the inner surface of the glass due to the temperature difference between the inside and outside of the greenhouse initially adhere to the hydrophilic region of the sharp outer part of the surface protrusion and gradually grow. When the droplet grows large enough to contact the hydrophobic film inside the protrusion, it continues to grow to a certain extent as water vapor continues to condense. However, due to the low surface tension of the hydrophobic film, it cannot overcome the surface tension of the droplet itself. Therefore, the droplet cannot continue to spread on the glass surface to increase the contact area and adhesion. Ultimately, under the combined effect of gravity and hydrophobic forces, the droplet rolls off, simultaneously pulling down nearby droplets and creating a chain reaction.

[0020] The beneficial effects of this invention are:

[0021] This preparation method is simple and easy to operate. The resulting waterproof and fog-proof glass, through the combined effect of hydrophilic and hydrophobic regions, prevents droplets from adhering to and remaining on the glass surface inside the greenhouse for extended periods, thus exhibiting excellent anti-fog performance. This allows the surface to remain clear and transparent for a longer time, improving the light transmission efficiency inside the greenhouse. The surface is also less prone to water stains, possessing self-cleaning or easy-to-clean properties, reducing the frequency of greenhouse glass cleaning and labor costs. Protected by the patterned glass structure and the inherent hardness of the film layer, the film is scratch-resistant, resulting in outstanding anti-fog performance and durability. The obtained anti-fog glass exhibits a 4μL water droplet roll-off angle of 0~10°, an average transmittance (380~1100nm) of not less than 93.5% (including the anti-reflective coating) or not less than 91.0% (excluding the anti-reflective coating), and a haze of 0~5%. Attached Figure Description

[0022] Figure 1 This is a top view of an anti-fog glass. There are many types of patterns on the surface of rolled glass. In this figure, a four-sided pyramid array is used to represent it, and the corresponding top view is represented by a rectangle.

[0023] Figure 2 This is a schematic cross-sectional view of an anti-fog glass, where 1 is the upper region of the rolled glass protrusion structure, 2 is the lower region of the rolled glass protrusion structure, and 3 is the gap of the protrusion structure. Detailed Implementation

[0024] The invention will now be further described with reference to the accompanying drawings:

[0025] An apparatus for preparing anti-fog glass includes a screen printing machine and screen printing plates A and B used in conjunction with it. The plate type is determined according to the pattern structure of the glass embossed surface and the distribution position of the water-collecting film. Screen printing plate A is used to print and coat the hydrophobic area, and screen printing plate B is used to print and coat the hydrophilic area.

[0026] A method for preparing anti-fog glass, the specific implementation steps of which are as follows: Example

[0027] (1) Using 3.2mm thick tempered rolled glass with anti-reflective coating as the substrate (the patterned glass and the raised structure are as follows) Figure 1 , Figure 2 As shown in the figure, the glass surface was effectively cleaned with deionized water and anhydrous ethanol in sequence, and then dried at 100°C for 10 min.

[0028] (2) A thermoplastic solvent-based silicone-acrylic resin solution was used, and the viscosity was adjusted to 1000 mPa·s to obtain a hydrophobic film coating solution HB.

[0029] (3) Fix the glass substrate on the C-86H semi-automatic screen printing machine, install the 350 mesh nylon screen printing plate A made according to the glass embossed surface pattern structure (quadrangular pyramid array) and size, set the squeegee tilt angle to 75°, the translation speed to 50mm / s, start the squeegee, so that the coating liquid HB is applied to the area of ​​1 / 2 height and below the raised structure of the glass embossed surface, and heat-treat and cure at 150℃ for 3min;

[0030] (4) Using SiO2 sol with an average particle size of 15nm and a solid content of 3.2%, adjust the viscosity to 800mPa·s to obtain hydrophilic film coating liquid HL. Replace and install 350 mesh stainless steel screen printing plate B on the screen printing machine, set the squeegee tilt angle to 75° and the translation speed to 50mm / s, start the squeegee, so that the coating liquid HL can only be coated on the remaining area of ​​the raised structure of the glass embossed surface. Heat treat and cure at 300℃ for 2min to obtain anti-fog glass.

[0031] The resulting anti-fog glass has a 4 μL water droplet roll-off angle of 3.6°, an average transmittance of 93.6% in the 380~1100nm wavelength range, and a haze of 1.9%. Example

[0032] (1) Using 3.2 mm thick tempered rolled glass without anti-reflective coating as the substrate (the patterned glass and the raised structure are as follows) Figure 1 , Figure 2 (As shown), the glass surface was effectively cleaned with deionized water and anhydrous ethanol successively, and then dried at 120℃ for 5 minutes;

[0033] (2) A thermosetting solvent-based silicone-acrylic resin solution was used, and the viscosity was adjusted to 2000 mPa·s to obtain a hydrophobic film coating solution HB.

[0034] (3) Fix the glass substrate on the C-86H semi-automatic screen printing machine, install the 250 mesh nylon screen printing plate A made according to the glass embossed surface pattern structure (quadrangular pyramid array) and size, set the squeegee tilt angle to 65°, the translation speed to 40 mm / s, start the squeegee, so that the coating liquid HB is applied to the area of ​​1 / 2 height and below the raised structure of the glass embossed surface, and heat-treat and cure at 120°C for 5 min;

[0035] (4) Using SiO2 sol with an average particle size of 10 nm and a solid content of 3.0%, adjust the viscosity to 1200 mPa·s to obtain the hydrophilic film coating liquid HL. Replace and install the 300-mesh stainless steel screen printing plate B on the screen printing machine, set the squeegee tilt angle to 70° and the translation speed to 45 mm / s, start the squeegee, so that the coating liquid HL can only be coated on the remaining area of ​​the raised structure of the glass embossed surface. Heat treat and cure at 280℃ for 3 min to obtain anti-fog glass.

[0036] The resulting anti-fog glass has a 4μL water droplet roll-off angle of 3.3°, an average transmittance of 91.0% in the 380~1100nm wavelength range, and a haze of 1.7%. Example

[0037] (1) Using 2.0 mm thick tempered rolled glass with anti-reflective coating as the substrate (the patterned glass and the raised structure are as follows) Figure 1 , Figure 2 As shown in the figure, the glass surface was effectively cleaned with deionized water and anhydrous ethanol in sequence, and then dried at 100°C for 10 minutes.

[0038] (2) Based on silicone-acrylic emulsion, adjust the viscosity to 1800 mPa·s to obtain HB coating liquid for hydrophobic film;

[0039] (3) Fix the glass substrate on the C-86H semi-automatic screen printing machine, install the 300-mesh nylon screen printing plate A made according to the glass embossed surface pattern structure (quadrangular pyramid array) and size, set the squeegee tilt angle to 70°, the translation speed to 45 mm / s, start the squeegee, so that the coating liquid HB is applied to the area of ​​1 / 4 height and below of the glass embossed surface raised structure, and heat-treat and cure at 100°C for 10 min;

[0040] (4) Using SiO2 sol with an average particle size of 10 nm and a solid content of 3.5%, adjust the viscosity to 1800 mPa·s, prepare the hydrophilic film coating liquid HL, replace and install the 300-mesh stainless steel screen printing plate B on the screen printing machine, set the squeegee tilt angle to 70° and the translation speed to 45 mm / s, start the squeegee, so that the coating liquid HL can only be coated on the remaining area of ​​the raised structure of the glass embossed surface, heat treat and cure at 320℃ for 2 min to obtain anti-fog glass.

[0041] The resulting anti-fog glass exhibits a 3.7° roll-off angle for a 4μL water droplet, an average transmittance of 93.8% in the 380~1100nm wavelength range, and a haze of 2.2%. Example

[0042] (1) Using 2.0 mm thick tempered rolled glass without anti-reflective coating as the substrate (the patterned glass and the raised structure are as follows) Figure 1 , Figure 2 As shown in the figure, the glass surface was effectively cleaned with deionized water and anhydrous ethanol in sequence, and then dried at 120°C for 5 min.

[0043] (2) Using silicone-acrylic resin emulsion, the viscosity was adjusted to 3000 mPa·s to obtain the hydrophobic film coating liquid HB;

[0044] (3) Fix the glass substrate on the C-86H semi-automatic screen printing machine, install the 200-mesh nylon screen printing plate A made according to the glass embossed surface pattern structure (quadrangular pyramid array) and size, set the squeegee tilt angle to 60°, the translation speed to 35 mm / s, start the squeegee, so that the coating liquid HB is applied to the area of ​​2 / 3 height and below of the glass embossed surface raised structure, heat treat at 120°C for 20 min, and then heat at 300°C for 5 min to obtain anti-fog glass.

[0045] The resulting anti-fog glass has a 4μL water droplet roll-off angle of 2.6°, an average transmittance of 91.2% in the 380~1100nm wavelength range, and a haze of 1.5%.

Claims

1. An anti-fog glass, characterized in that: The embossed surface of the rolled glass has a hydrophilic region on the raised portion and a hydrophobic region on the remaining portion, which together form a water-collecting film. The anti-fog glass is manufactured by a method comprising the following steps: (1) The surface of the rolled glass is cleaned with water and ethanol in sequence, and then dried; (2) Fix the calendered glass substrate on the screen printing equipment, install screen printing plate A, adjust the printing parameters, and print the hydrophobic coating liquid HB on the part of the raised structure of the embossed surface of the calendered glass at 1 / 4 to 3 / 4 height and below, and cure the film layer; the coating liquid HB in step (2) is one of thermoplastic solvent-based silicone acrylic resin coating liquid, thermosetting solvent-based silicone acrylic resin coating liquid, and emulsion-based silicone acrylic resin coating liquid, and its viscosity is adjusted to the range of 900 to 3500 mPa·s before use; the further step after step (2) is: replace and install screen printing plate B, adjust the printing parameters, print the hydrophilic coating liquid HL on the remaining area of ​​the raised structure of the embossed surface of the calendered glass, and cure the film layer; the coating liquid HL is SiO2 sol with an average particle size of 5 to 30 nm, and the solid content is 2% to 5%; the style and size of screen printing plate A and screen printing plate B are determined according to the pattern structure of the glass embossed surface and the distribution position of the water collection film.

2. The anti-fog glass according to claim 1, characterized in that: The unpatterned surface of the rolled glass is coated with an anti-reflective film.

3. A method for preparing anti-fog glass, comprising the following steps: (1) cleaning the surface of rolled glass sequentially with water and ethanol, and then drying it; (2) Fix the calendered glass substrate on the screen printing equipment, install screen printing plate A, adjust the printing parameters, and print the hydrophobic coating liquid HB on the part of the raised structure of the embossed surface of the calendered glass at 1 / 4 to 3 / 4 height and below, and cure the film layer; the coating liquid HB in step (2) is one of thermoplastic solvent-based silicone acrylic resin coating liquid, thermosetting solvent-based silicone acrylic resin coating liquid, and emulsion-based silicone acrylic resin coating liquid, and its viscosity is adjusted to the range of 900 to 3500 mPa·s before use; the further step after step (2) is: replace and install screen printing plate B, adjust the printing parameters, print the hydrophilic coating liquid HL on the remaining area of ​​the raised structure of the embossed surface of the calendered glass, and cure the film layer; the coating liquid HL is SiO2 sol with an average particle size of 5 to 30 nm, and the solid content is 2% to 5%; the style and size of screen printing plate A and screen printing plate B are determined according to the pattern structure of the glass embossed surface and the distribution position of the water collection film.

4. The method for preparing anti-fog glass according to claim 3, characterized in that: In step (2), the screen printing plate A is a hydrophobic nylon screen with a mesh count of 200-350.

5. The method for preparing anti-fog glass according to claim 3, characterized in that: The screen printing plate B is a hydrophilic stainless steel wire mesh with a mesh count of 200-350.

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