Infrared barrier silk-screen printing ink based on cesium tungsten bronze and preparation method and application of infrared barrier silk-screen printing ink

Abstract

The invention relates to the technical field of barrier ink, and discloses infrared barrier screen printing ink based on cesium-tungsten bronze and a preparation method and application thereof.The infrared barrier screen printing ink is prepared from cesium-tungsten bronze nanoparticles, epoxy resin, a silane coupling agent, a flatting agent and a photoinitiator, bisphenol A type epoxy resin is adopted, and the preparation method comprises the steps of burdening, grinding, ink preparation and screen printing. According to the infrared barrier screen printing ink based on cesium-tungsten bronze, plasma resonance absorption (near infrared) of cesium-tungsten bronze and a compact structure of epoxy resin are adopted in the ink to synergistically enhance the barrier property, meanwhile, the agglomeration problem is solved through a nano-particle surface coating technology, the printing uniformity is ensured, printing is conducted on IR holes of optical equipment, and the printing quality is greatly improved. The printing is located on the periphery of the IR hole, projection of glass on the periphery of the IR hole cannot be blocked, meanwhile, the attractiveness of the lens is not affected, the protection effect of optical sensors such as an intelligent mobile phone / tablet computer camera module and a vehicle-mounted camera and AR / VR equipment is improved, and the refraction prevention requirement is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of barrier inks, in particular to an infrared barrier screen printing ink based on cesium tungsten bronze, and a preparation method and application thereof. Background Art

[0002] Silk screen ink is an ink used to strengthen glass lenses in mobile phones, navigation systems, LCD TVs, etc. to enhance the optical effect of the lenses.

[0003] In the prior art, such as the application number: CN201610370332.8 disclosed in the name: A processing method for a glass camera lens and the device used therein, wherein the silk-screen ink layer is specifically: a layer of ink is silk-screened on the surface of the second workpiece by a silk-screen printing machine to obtain a third workpiece; a layer of silicon oxide is electroplated on the ink layer of the third workpiece to obtain a fourth workpiece; a protective ink layer is silk-screened on the silicon oxide layer of the fourth workpiece to obtain a fifth workpiece; the material of the protective ink layer is a hydrofluoric acid-resistant protective ink, and the protective ink layer includes 2-8 layers of protective ink single layers.

[0004] However, in actual application of the ink mentioned in the prior art, a single layer of IR ink only covers the hole position, which will cause infrared rays to be projected from the area around the IR hole, causing the light to be refracted in the glass, resulting in IR probe ranging errors, and the ink can easily lead to poor flatness and aesthetics of the lens surface. Summary of the Invention

[0005] The purpose of the present invention is to provide an infrared blocking screen printing ink based on cesium tungsten bronze and a preparation method and application thereof, so as to solve the problems in the prior art.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] An infrared blocking screen printing ink based on cesium tungsten bronze, wherein the weight percentages of the raw materials of the infrared blocking screen printing ink are as follows:

[0008] 12-18wt% of cesium tungsten bronze nanoparticles, 70-85wt% of epoxy resin, 0.5-1.5wt% of silane coupling agent, 0.1-0.3wt% of leveling agent, and 1-2wt% of photoinitiator.

[0009] The particle size of the cesium tungsten bronze nanoparticles is 20-50nm.

[0010] The epoxy resin is bisphenol A type, and the molecular weight is Mw=15000-20000.

[0011] Furthermore, the silane coupling agent is KH-550, which is used to improve the dispersibility in the ink.

[0012] Furthermore, the leveling agent is BYK-333, which is used to provide smoothness after ink printing.

[0013] Furthermore, the photoinitiator is Irgacure 184, which is used to achieve UV rapid curing.

[0014] A method for preparing an infrared blocking screen printing ink based on cesium tungsten bronze, the preparation method comprising the following steps:

[0015] S1. Weigh the above raw materials according to weight.

[0016] S2. Turn on the sand mill, and then put the cesium tungsten bronze nanoparticles into the sand mill to obtain dispersed cesium tungsten bronze nanoparticles.

[0017] S3. Then, the dispersed cesium tungsten bronze nanoparticles are put into a mixer, and then epoxy resin and additives are added to obtain the desired ink.

[0018] S4. Apply the ink on the screen and use the screen to print on a 50-100 μm wide annular area around the IR hole of the mobile phone, and perform UV curing operation.

[0019] Furthermore, the rotation speed of the sand mill in the dispersion grinding process in S2 is 3000 rpm, and the grinding time is 30 minutes.

[0020] Furthermore, the stirring speed of the stirrer in S3 during the ink preparation process is 2000 rpm, and the stirring time is 20 minutes.

[0021] Furthermore, the screen mesh number of the screen printing in S4 is 200-250 mesh, and the thickness of the ink layer is 8-12 μm.

[0022] The invention discloses an application of infrared blocking silk screen printing ink based on cesium tungsten bronze in optical module lenses.

[0023] Beneficial effects of the present invention:

[0024] 1. The infrared blocking screen printing ink of the present invention is based on cesium tungsten bronze. The plasma resonance absorption (near infrared) of cesium tungsten bronze and the dense structure of epoxy resin are used in the ink to synergistically enhance the barrier property. At the same time, the nanoparticle surface coating technology solves the agglomeration problem and ensures printing uniformity.

[0025] 2. The preparation method of the infrared blocking silk screen printing ink based on cesium tungsten bronze of the present invention is printed on the IR hole of the optical device. The printing around the IR hole will not block the projection of the glass around the IR hole, and will not affect the aesthetics of the lens. It improves the protection effect of optical sensors such as smartphone / tablet camera modules, car cameras, and AR / VR devices, and increases the anti-refraction demand. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] Figure 1 It is a schematic flow chart of the preparation method of the present invention;

[0028] Figure 2 This is a schematic diagram of the IR blocking rate test spectrum curve of the present invention;

[0029] Figure 3 This is a schematic diagram of the IR blocking rate test spectrum curve of the present invention;

[0030] Figure 4 It is a schematic diagram of ink printing of the present invention. DETAILED DESCRIPTION

[0031] 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 any creative efforts shall fall within the scope of protection of the present invention.

[0032] An infrared blocking screen printing ink based on cesium tungsten bronze and its preparation method and application, such as Figures 1 to 4 As shown, the weight percentages of the raw materials of the infrared blocking silk screen ink are as follows: cesium tungsten bronze nanoparticles 12-18wt%, epoxy resin 70-85wt%, silane coupling agent 0.5-1.5wt%, leveling agent 0.1-0.3wt%, photoinitiator 1-2wt%.

[0033] The molecular formula of cesium tungsten bronze nanoparticles is Cs 0.33 WO3, wherein the cesium tungsten bronze nanoparticles are prepared by citric acid induced hydrothermal synthesis, and the particle size of the cesium tungsten bronze nanoparticles is controlled at 20-50 nm. In the raw material ingredients for preparing the ink, the cesium tungsten bronze nanoparticles account for 12-18wt% of the total mass of the ink, preferably 15wt%.

[0034] In this embodiment, the epoxy resin is bisphenol A, and the molecular weight is Mw=15000-20000.

[0035] The silane coupling agent used is KH-550, which is used to improve the dispersion in the ink.

[0036] BYK-333 is used as the leveling agent to improve the smoothness of the ink after printing.

[0037] Irgacure 184 was used as the photoinitiator to achieve rapid UV curing.

[0038] A blender and a sand grinder are also required in the preparation process.

[0039] The preparation method comprises the following steps:

[0040] S1. Weigh the above raw materials according to weight.

[0041] S2. Turn on the sand mill and adjust the speed to 3000 rpm. Then, put the cesium tungsten bronze nanoparticles into the sand mill and grind for 30 minutes to obtain dispersed cesium tungsten bronze nanoparticles.

[0042] S3. Then, the dispersed cesium tungsten bronze nanoparticles are put into a mixer, the stirring speed is set to 2000 rpm, and then epoxy resin and additives are added, and stirred for 20 minutes to obtain the desired ink.

[0043] S4. Apply the ink on the screen and use the screen to print on a 50-100 μm wide annular area around the IR hole of the mobile phone, and perform UV curing operation.

[0044] The mesh size of the screen is 200-250 mesh, the thickness of the ink layer is controlled to be 8-12μm, and the UV-A band (365nm) irradiation energy is 200-300mJ / cm 2 .

[0045] The printed glass around the IR hole is tested for 940nm infrared rays. The ink has an infrared transmission blocking rate of ≥90%, eliminating refraction interference, and the glass maintains a 550nm visible light transmittance of >85%, without affecting the decorative color of the lens (ΔE≤1.5).

[0046] In this embodiment, the plasma resonance absorption (near infrared) of cesium tungsten bronze and the dense structure of epoxy resin synergistically enhance the barrier properties, while the nanoparticle surface coating technology solves the agglomeration problem and ensures printing uniformity.

[0047] Moreover, the printing is located around the IR hole, which will not block the projection of the glass around the IR hole, and will not affect the aesthetics of the lens. It improves the protection effect of optical sensors such as smartphone / tablet camera modules, car cameras, and AR / VR devices, and increases the demand for anti-refraction.

[0048] The comparison results between this embodiment and traditional IR ink are as follows:

[0049] parameter Traditional single-layer IR ink Double-layer ink of the present invention (IR hole + periphery) IR blocking rate (940nm) 85％ Hole position 98% / periphery 92% Visible light transmittance (%) 90 88 Distance measurement error (mm) ≥1.5 ≤0.3

[0050] The performance test results of this embodiment and traditional IR ink are as follows:

[0051] Test items <![CDATA[This invention (15 wt% Cs 0.33 WO3)]]> Traditional IR ink 940nm infrared blocking rate 92%@12μm film thickness 85%@10μm film thickness 550nm visible light transmittance 87.3％ 91.5％ Lens decoration chromatic aberration (ΔE) 1.2 (CIELab) 2.8 Abrasion resistance (cross-hatch method) 5B 4B

[0052] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. An infrared blocking screen printing ink based on cesium tungsten bronze, characterized in that: The weight percentages of the raw materials of the infrared blocking silk screen printing ink are as follows: 12-18wt% of cesium tungsten bronze nanoparticles, 70-85wt% of epoxy resin, 0.5-1.5wt% of silane coupling agent, 0.1-0.3wt% of leveling agent, and 1-2wt% of photoinitiator; The particle size of the cesium tungsten bronze nanoparticles is 20-50nm; The epoxy resin is bisphenol A type, and the molecular weight is Mw=15000-20000.

2. The infrared blocking screen printing ink based on cesium tungsten bronze according to claim 1, characterized in that: The silane coupling agent is KH-550, which is used to improve the dispersibility in the ink.

3. The infrared blocking screen printing ink based on cesium tungsten bronze according to claim 1, characterized in that: The leveling agent is BYK-333, which is used to improve the smoothness of the ink printing effect.

4. The infrared blocking screen printing ink based on cesium tungsten bronze according to claim 1, characterized in that: The photoinitiator is Irgacure 184, which is used to achieve UV fast curing.

5. The method for preparing an infrared blocking screen printing ink based on cesium tungsten bronze according to claim 1, wherein: The preparation method comprises the following steps: S1. Weigh the above raw materials according to weight; S2, turning on the sand mill, and then putting the cesium tungsten bronze nanoparticles into the sand mill to obtain dispersed cesium tungsten bronze nanoparticles; S3, then adding the dispersed cesium tungsten bronze nanoparticles into a blender, and then adding epoxy resin and additives to obtain the desired ink; S4. Apply the ink on the screen and use the screen to print on a 50-100 μm wide annular area around the IR hole of the mobile phone, and perform UV curing operation.

6. The method for preparing an infrared blocking screen printing ink based on cesium tungsten bronze according to claim 5, characterized in that: The speed of the sand mill in S2 during the dispersion grinding process is 3000 rpm, and the grinding time is 30 min.

7. The method for preparing an infrared blocking screen printing ink based on cesium tungsten bronze according to claim 5, characterized in that: The stirring speed of the stirrer in S3 during the ink preparation process is 2000 rpm, and the stirring time is 20 minutes.

8. The method for preparing an infrared blocking screen printing ink based on cesium tungsten bronze according to claim 5, characterized in that: The mesh number of the silk screen printing in S4 is 200-250 mesh, and the thickness of the ink layer is 8-12 μm.

9. Application of the infrared blocking silk screen printing ink based on cesium tungsten bronze according to claim 1 on optical module lenses.

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