Method for packaging glass beads on glass surface

Abstract

The invention discloses a method for packaging glass beads on a glass surface, and belongs to glass substrate surface treatment. Through particle size screening and local surface modification, the glass beads and the thixotropic agent are combined, so that the glass beads are uniformly dispersed in the ink, and the printing effect and performance of the ink are improved by adjusting the viscosity and fluidity of the ink; the particle size distribution of the glass beads is concentrated, the surface of the bonding layer is basically coated with the glass beads according to the thickness of a single particle layer after printing and curing to form light guide dot patterns, materials are saved, and light guide is uniform; the light guide lattice points play a light guide role due to lattice point distribution, and the brightness of the light emitting surface of the light source system is further improved due to the high reflectivity of the glass beads contained in the ink; therefore, according to the method for packaging the glass beads on the glass surface, the ink printing performance is good, the service life is long, the brightness of the glass light guide plate obtained through silk-screen printing is high, and the method has important application value in the fields of advertising lamp boxes, liquid crystal display backlight modules and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of glass substrate surface treatment, and in particular relates to a method for encapsulating glass microbeads on a glass surface. Background Art

[0002] Glass beads are a spherical glass material with a particle size of microns. They have good sphericity, transparency, hardness, light reflectivity and excellent chemical stability. They can be used as lightening agents, reflective materials, reinforcing filling materials, etc. They are widely used in chemical, navigation, optoelectronic display, transportation, oil drilling and other fields. Light guide plate (LGP) is a product that converts point and line light sources into surface light sources. Compared with traditional light guide plates made of PMMA or PC sheets as substrates, glass light guide plates have the advantages of not easy to yellow, not easy to deform, not easy to expand, high temperature resistance, moisture resistance, and long service life. The dot structure of the glass light guide plate is the key to achieving uniform light distribution.

[0003] Screen printing is an important method for preparing light-guiding dots on glass surfaces. When glass beads are used as fillers in screen printing inks, they have unique reflective properties and can significantly improve the reflective effect of light-guiding dots, making the printed pattern brighter and more eye-catching under light. Glass beads have good weather resistance and corrosion resistance, which can extend the service life of light-guiding dots. The addition of glass beads gives screen printing inks more functions and characteristics, so that they can be applied to more fields, such as traffic safety, outdoor advertising, and architectural decoration.

[0004] When glass beads are used as fillers in inks with their optical properties, they need to be evenly dispersed in the binder. If the dispersion is uneven, it will affect the printing effect of the ink on the dot structure, resulting in problems such as uneven color depth and spots. In order to ensure the uniform dispersion of glass beads in the ink, dispersants need to be added. Dispersants mainly include surfactant dispersants, polymer dispersants, and inorganic dispersants. For surfactant dispersants, some salt impurities will be introduced, and may cause charge interference in some ink systems, resulting in an imbalance in the interaction force between the components in the ink system, which will cause ink stratification or glass beads precipitation; for polymer dispersants, functional groups and longer molecular chains have poor weather resistance, and are prone to aging and discoloration under the influence of long-term light and temperature and humidity factors, resulting in a decrease in ink performance; for inorganic dispersants, by making the glass beads carry charges, the electrostatic repulsion is increased to prevent the beads from agglomerating, but the impurity ions they introduce will also affect the stability of the ink.

[0005] In addition to the uniformity of dispersion, the addition of glass beads also has a certain effect on the thixotropy of the ink. Screen printing ink needs to have good thixotropy, that is, it can maintain a high viscosity when stationary to prevent the ink from sagging and penetration; when subjected to external forces (such as scrapers), the viscosity decreases rapidly, so that the ink can pass through the screen printing plate smoothly and be evenly transferred to substrates such as glass. If the viscosity is not properly controlled, it may cause problems such as unclear printing dots or missing prints. As a commonly used thixotropic agent, fumed silica contains abundant silanol (Si-OH) on its surface, which can interact with adjacent fumed silica aggregates to form hydrogen bonds, thereby forming a three-dimensional network structure in the ink; this network structure is formed or destroyed with the change of shear force in the ink, which can significantly affect the fluidity and thixotropy of the ink. However, hydrophilic fumed silica is easy to agglomerate in the ink. In order to achieve thixotropy and uniform dispersion at the same time, high shear dispersion and the use of auxiliary dispersants are often used. For the high shear dispersion method, high shear force or excessive shearing may destroy the surface structure of the glass beads; the high heat generated during the shearing process has an adverse effect on the stability of the ink. When using dispersants, while improving the dispersibility of fumed silica in ink, the dispersants will cover the hydroxyl groups on the surface of the fumed silica and reduce its thixotropic effect. Therefore, it is urgent to solve the above problems to meet the higher demands in the field of glass substrate surface treatment technology. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects of the prior art and provide a method for preparing aluminum titanate nanofibers.

[0007] The purpose of the present invention can be achieved through the following technical solutions: A method for encapsulating glass microbeads on a glass surface comprises the following steps: S1, adding glass beads G to UV curable transparent ink, and mixing thoroughly to obtain ink A; Glass microspheres can improve the optical properties of inks; in addition, glass microspheres can also enhance the weather resistance and structural strength of inks. Moreover, surface-modified glass microspheres can be fully dispersed in inks and can also work with the thixotropic agent in the inks with their hydrophilic parts to help improve the uniformity of thixotropic agent dispersion, enhance the anti-precipitation property of microspheres and the anti-sagging property of inks, and improve the process performance and use performance of inks. S2, using an organic solvent and deionized water to treat the surface of the glass plate under ultrasonic waves to form a clean and flat surface, and then coating the surface of the glass plate with a silane coupling agent and curing it to obtain a glass plate containing an adhesive layer; The introduction of the adhesive layer can effectively solve the problems of ink falling off or peeling off during printing and weak light guide points caused by insufficient adhesion between the ink and the surface of the glass plate, thereby extending the service life of the ink-printed light guide point pattern; S3, designing a micro-bead dot matrix and designing and manufacturing a corresponding screen printing plate according to the light guide plate dot design software; applying ink A on a glass plate containing an adhesive layer according to the designed printing speed, screen tension and pressure to form a light guide dot microstructure with a certain distribution pattern; placing the printed glass plate in a UV radiation curing box for radiation curing to obtain a glass plate containing light guide dots; By controlling the aperture and thickness of the screen printing plate, it can be ensured that the ink containing micro beads can be smoothly printed on the surface of the light guide plate glass through the screen printing plate and form a single particle layer of glass micro beads light guide dot pattern as much as possible; the uniform and comprehensive printing method is adopted to ensure that the pattern area and the non-pattern area are equally protected; S4. Coat the encapsulation layer on the surface of the glass plate containing the light-guiding dots, and then put it into a UV radiation curing box to cure the encapsulation layer and other film layers into one.

[0008] The introduction of the encapsulation layer protects the light-guiding points, improves their wear resistance, weather resistance, and dust resistance, and further increases the service life of the glass plate.

[0009] Furthermore, the glass microspheres G in step S1 are solid glass microspheres or hollow glass microspheres; if hollow glass microspheres are used, the compressive strength tested by the air pressure method should satisfy the requirement that the ball breakage rate after maintaining the pressure at 30 MPa for 10 minutes is no more than 20%; the median diameter of the glass microspheres ranges from 5 to 25 μm, and the particle size distribution span is ≤0.2; the surface of the glass microspheres is subjected to surface hydrophobic modification, and the modified area accounts for 50% to 80% of the total surface area of ​​the microspheres.

[0010] Furthermore, in step S1, the amount of glass beads G added accounts for 5%-40% of the total amount of UV curable transparent ink; the UV curable transparent ink meets the viscosity range of 900-3500 mPa·s (25° C.).

[0011] Furthermore, in step S2, the organic solvent is one or more of methanol, ethanol, acetone and diethyl ether.

[0012] Furthermore, in step S2, the silane coupling agent is one of KH-560, KH-550, KH-570, KH-792 and KH-590.

[0013] Furthermore, in step S2, the coating temperature is from room temperature to 80°C, and the curing temperature is from room temperature to 300°C.

[0014] Furthermore, in step S3, the aperture of the screen printing plate is not less than 2 times the D90 particle diameter of the glass beads, and the thickness of the screen is not greater than 1.5 times the D90 particle diameter of the glass beads.

[0015] Furthermore, in step S4, the encapsulation layer is formed by coating and curing UV-curable transparent ink.

[0016] Beneficial effects of the present invention: 1. After particle size screening and partial surface modification, the glass microbeads and thixotropic agent work together to not only disperse evenly in the ink, but also improve the printing effect and performance of the ink by adjusting the viscosity and fluidity of the ink; 2. The introduction of bonding layer can extend the service life of ink-printed light-guiding dot patterns; 3. Different from the glass microbeads added in ordinary reflective ink, the glass microbeads of the present invention have concentrated particle size distribution. After selecting appropriate screen aperture and screen thickness, they are basically coated on the surface of the bonding layer with a single particle layer thickness to form a light-guiding dot pattern after printing and curing, which saves materials and guides light evenly; the light-guiding dots not only guide light due to the dot distribution, but also further improve the brightness of the light-emitting surface of the light source system due to the high reflectivity of the glass microbeads contained in the ink; 4. The introduction of the encapsulation layer protects the light guide points and further increases the service life of the glass plate; Therefore, the method of encapsulating glass microbeads on the glass surface of the present invention has good ink printing performance and long service life, and the glass light guide plate obtained by screen printing has high brightness, and has important application value in the fields of advertising light boxes, liquid crystal display backlight modules, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 This is a flow chart of the technical solution for encapsulating glass microspheres on glass surface according to an embodiment of the present invention; Figure 2 Schematic diagram of partially hydrophobized glass microbeads in an embodiment of the present invention (microbead G1, modified area = 50%; microbead G2, modified area = 75%); Figure 3 This is a schematic diagram of the cross-sectional structure of glass microspheres encapsulated on a glass surface according to an embodiment of the present invention, wherein 1 is a glass plate, 2 is an adhesive layer, 3 is a dot layer, and 4 is an encapsulation layer; Figure 4 for Figure 3 The dotted circle area is a partially enlarged schematic diagram, 1 is a glass plate, 2 is an adhesive layer, 31 is glass beads in the silk-screen ink dot layer, 32 is other components of the silk-screen ink dot layer except the glass beads, and 4 is an encapsulation layer. DETAILED DESCRIPTION

[0019] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0020] The embodiments of the present invention are all in accordance with Figure 1 The technical process encapsulates glass microbeads on the glass surface.

[0021] Example 1 S1, solid glass microspheres G1 with a median diameter of 15 μm, a particle size distribution span of 0.13, and a surface hydrophobic modification area accounting for 50% of the total surface area of ​​the microspheres, such as Figure 2 As shown in G1, it is added to UV curing transparent ink (commercial UV curing varnish ink, colorless and transparent, viscosity: 1800mPa·s at 25°C), fully mixed with a high-speed disperser, and the large particle impurities and incompletely dispersed microbeads in the ink are removed by filtering equipment to obtain ink A; the amount of glass microbeads G1 added accounts for 15% of the total amount of the ink; S2, using ethanol and deionized water to treat the surface of the glass plate 1 under ultrasonic conditions to form a clean and flat surface, coating the surface of the glass plate with a silane coupling agent KH-550 under an environment of 25° C. and 60 RH% air humidity, and curing at 120° C. for 5 minutes to form an adhesive layer 2 on the surface of the glass plate 1, thereby obtaining a glass plate containing an adhesive layer; S3. Design and manufacture a screen printing plate with an aperture of 300 mesh and a thickness of (20±5) μm according to the light guide plate dot design software, and fix it on a semi-automatic screen printer C-86H; move the scraper to scrape ink A on the glass plate with the adhesive layer, and use a uniform and full printing method to form a light guide dot microstructure with a certain distribution pattern on the surface of the glass plate; put the printed glass plate into a UV radiation curing box, and set the UV irradiation intensity to 1000 mW / cm 2 , irradiation time 30s, complete the curing and forming of the light guide dots, form the dot layer 3, and obtain a glass plate containing light guide dots; the partial schematic diagram of the light guide dots is shown in the attached Figure 4 ; S4, coating a UV curable transparent ink encapsulation layer 4 on the surface of the glass plate containing the light guide dots, and then placing it in a UV radiation curing box to cure the encapsulation layer and other layers into one, thereby obtaining a glass light guide plate encapsulating glass microbeads, as shown in the attached Figure 3 shown.

[0022] Example 2 S1, solid glass microspheres G2 with a median diameter of 24 μm, a particle size distribution span of 0.08, a compressive strength of 30 MPa (10 min) as tested by the air pressure method, a ball breaking rate of 20%, and a surface hydrophobic modification area of ​​75% of the total surface area of ​​the microspheres, such as Figure 2As shown in G2, it is added to UV curing transparent ink (commercial UV curing varnish ink, colorless and transparent, viscosity: 3500mPa·s at 25°C), fully mixed with a high-speed disperser, and the large particle impurities and incompletely dispersed microbeads in the ink are removed by filtering equipment to obtain ink A; the amount of glass microbeads G2 added accounts for 20% of the total amount of ink; S2, using ethanol and deionized water to treat the surface of the glass plate 1 under ultrasonic conditions to form a clean and flat surface, coating the surface of the glass plate with a silane coupling agent KH-560 under an environment of 35° C. and 50 RH% air humidity, and curing at 150° C. for 3 min to form an adhesive layer 2 on the surface of the glass plate 1, thereby obtaining a glass plate containing an adhesive layer; S3. Design and manufacture a screen printing plate with an aperture of 250 mesh and a thickness of (30±5) μm according to the light guide plate dot design software, and fix it on a semi-automatic screen printer C-86H; move the scraper to scrape ink A on the glass plate with the adhesive layer, and use a uniform and full printing method to form a light guide dot microstructure with a certain distribution pattern on the surface of the glass plate; put the printed glass plate into a UV radiation curing box, and set the UV irradiation intensity to 1200 mW / cm 2 , irradiation time 30s, complete the curing and forming of the light guide dots, form the dot layer 3, and obtain a glass plate containing light guide dots; the partial schematic diagram of the light guide dots is shown in the attached Figure 4 ; S4, coating a UV curable transparent ink encapsulation layer 4 on the surface of the glass plate containing the light guide dots, and then placing it in a UV radiation curing box to cure the encapsulation layer and other layers into one, thereby obtaining a glass light guide plate encapsulating glass microbeads, as shown in the attached Figure 3 shown.

[0023] Comparative Example 1 Without adding glass beads, the remaining steps are the same as those in Example 1 to obtain a glass light guide plate.

[0024] Comparative Example 2 Unmodified glass microspheres were used, and the remaining steps were the same as those in Example 1 to prepare a glass light guide plate.

[0025] The glass light guide plates prepared in Example 1-2 and Comparative Example 1-2 were installed in a backlight unit and placed in a dark room. The power was turned on to preheat the backlight unit for 15 minutes to keep the brightness stable. A high-definition camera was used to capture a complete image of the light guide plate to ensure that the image had no obvious noise or blur. The image was imported into the image analysis software to perform image preprocessing and define the analysis area to obtain brightness and average brightness data. The solvent wiping resistance and abrasion resistance of the light guide plate were tested according to the method specified in "JC / T2764-2023 Light Guide Plate Glass"; The measured results are shown in the following table: It can be seen from the above table that after adding modified glass microbeads, the ink solvent wiping resistance, abrasion resistance and brightness of the embodiment of the present invention are higher than those of the control example. Therefore, the glass light guide plate prepared by the method of the present invention has important application value in the fields of advertising light boxes, liquid crystal display backlight modules, etc.

[0026] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0027] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A method for encapsulating glass microspheres on a glass surface, characterized in that: The steps include: S1, adding glass beads G to UV curable transparent ink, and mixing thoroughly to obtain ink A; S2, using an organic solvent and deionized water to treat the surface of the glass plate under ultrasonic waves to form a clean and flat surface, and then coating the surface of the glass plate with a silane coupling agent and curing it to obtain a glass plate containing an adhesive layer; S3, designing the micro-bead dot matrix and the corresponding screen printing plate according to the light guide plate dot design software, and producing the micro-bead dot matrix; applying ink A on the glass plate with the bonding layer according to the designed printing speed, screen tension and pressure to form a light guide dot microstructure; Putting the printed glass plate into a UV radiation curing box for radiation curing to obtain a glass plate containing light-guiding dots; S4. Coat the encapsulation layer on the surface of the glass plate containing the light-guiding dots, and then put it into a UV radiation curing box to cure the encapsulation layer and other film layers into one.

2. A method for encapsulating glass microspheres on a glass surface according to claim 1, characterized in that: In step S1, the ratio of polyvinyl pyrrolidone to N,N-dimethylformamide is 5 g:100 mL.

3. The method for encapsulating glass microspheres on a glass surface according to claim 1, characterized in that: The glass microspheres G in step S1 are solid glass microspheres or hollow glass microspheres. If hollow glass microspheres are used, the compressive strength tested by the air pressure method should meet the requirement that the ball breakage rate after maintaining the pressure at 30 MPa for 10 minutes is not greater than 20%; The median diameter of the glass microspheres ranges from 5 to 25 μm, and the particle size distribution span is ≤0.2; the surface of the glass microspheres is treated with hydrophobic modification, and the modified area accounts for 50% to 80% of the total surface area of ​​the microspheres.

4. The method for encapsulating glass microspheres on a glass surface according to claim 1, characterized in that: In step S1, the amount of glass beads G added is 5%-40% of the total amount of UV curable transparent ink; the UV curable transparent ink meets the viscosity range of 900-3500 mPa·s (25° C.).

5. The method for encapsulating glass microspheres on a glass surface according to claim 1, characterized in that: In step S2, the organic solvent is one or more of methanol, ethanol, acetone and ether.

6. The method for encapsulating glass microspheres on a glass surface according to claim 1, characterized in that: In step S2, the silane coupling agent is one of KH-560, KH-550, KH-570, KH-792 and KH-590.

7. The method for encapsulating glass microspheres on a glass surface according to claim 1, characterized in that: In step S2, the coating temperature is from room temperature to 80°C, and the curing temperature is from room temperature to 300°C.

8. The method for encapsulating glass microspheres on a glass surface according to claim 1, characterized in that: In step S3, the aperture of the screen printing plate is not less than 2 times the D90 particle diameter of the glass beads, and the thickness of the screen is not greater than 1.5 times the D90 particle diameter of the glass beads.

9. The method for encapsulating glass microspheres on a glass surface according to claim 1, characterized in that: In step S4, the encapsulation layer is formed by coating and curing UV-curable transparent ink.

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