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CN-121979409-A - Touch screen with scratch-resistant coating

CN121979409ACN 121979409 ACN121979409 ACN 121979409ACN-121979409-A

Abstract

The invention belongs to the technical field of touch screens, and particularly relates to a touch screen with a scratch-resistant coating. The glass substrate disclosed by the invention has the advantages that the boron oxide is used for replacing alkali metal, the melt processing property of the glass is improved when the glass is melted, the problem of screen failure caused by rapid diffusion of alkali metal cations in the glass after the alkali metal is added is solved, the high-content aluminum oxide enables the prepared glass substrate to have excellent hardness, the hardness, wear resistance and chemical corrosion resistance of the glass are further improved through zirconium dioxide, the impact resistance and the scratch resistance of the substrate are enhanced, and the service life of the touch screen is prolonged.

Inventors

  • LI NAN
  • HUANG JINCAI
  • YIN QIAO

Assignees

  • 深圳市启触光电科技有限公司

Dates

Publication Date
20260505
Application Date
20260206

Claims (9)

  1. 1. The touch screen with the scratch-resistant coating is characterized by comprising a glass substrate layer, an adhesive layer, a transparent electrode layer, a protective layer, an anti-reflection layer and the scratch-resistant coating from bottom to top; The glass substrate layer is aluminum silicate-borate composite glass with two sides coated with indium tin oxide, the average thickness is 1.6-2 mm, the average thickness of the indium tin oxide coating is 30-40 nm, and the thermal expansion rate is 3X 10 -6 /℃~3.3×10 -6 /°C; the aluminosilicate-borate composite glass comprises 60-65% of silicon dioxide, 12-17% of aluminum oxide, 5-10% of boron oxide, 5-10% of calcium oxide, 4-6% of magnesium oxide, 2-4% of strontium oxide and 0.05-0.1% of zirconium dioxide.
  2. 2. The touch screen with the scratch-resistant coating according to claim 1, wherein the anti-reflection layer comprises a titanium dioxide coating and a silicon dioxide coating from bottom to top, the titanium dioxide coating is sequentially coated by magnetron sputtering, the average thickness of the titanium dioxide coating is 70-80 nm, and the average thickness of the silicon dioxide coating is 40-50 nm; The protective layer is microcrystalline glass, and the average thickness is 1-1.5 mm; The adhesive layer is ultraviolet curing optical adhesive of acrylic resin, and the average thickness is 10-15 mu m; the average thickness of the scratch-resistant coating is 1.5-3 mu m.
  3. 3. The touch screen with the scratch-resistant coating according to claim 1, wherein the preparation method of the glass substrate comprises the following steps: s11, according to the chemical composition of the aluminosilicate-borate composite glass, adding the corresponding raw material substances into a mixer, uniformly mixing, adding into a melting furnace, heating and melting, and melting to obtain glass liquid; s12, clarifying and homogenizing the glass liquid, flowing into the surface of the molten tin for float forming, controlling the thickness by an edge roller, and cooling and shaping to obtain ultrathin glass; S13, adding the ultrathin glass into an annealing furnace, annealing, cooling, eliminating stress, putting into a magnetron sputtering furnace, sputtering two sides of the glass to plate indium tin oxide, cooling, and cutting into different specifications to obtain the glass substrate.
  4. 4. The touch screen with the scratch-resistant coating according to claim 3, wherein the temperature in the step S11 is raised to 1500-1600 ℃ and melted for 2-3 hours.
  5. 5. The touch screen with the scratch-resistant coating according to claim 3, wherein a clarifying agent is added in the S12, the clarifying agent is prepared by mixing tin oxide, cerium oxide and titanium dioxide according to a mass ratio of 5-8:1-2:0.5-0.8, the adding amount of the clarifying agent is 0.5-1.3% of the mass of glass liquid, argon bubbling is introduced, stirring and homogenizing are carried out for 1-2 hours at a rotating speed of 10-15 rpm, the glass liquid flows into the surface of tin liquid for float forming at 1050-1150 ℃, the temperature is reduced to 880-950 ℃, the thickness of the glass is controlled by a drawing machine, and the glass is cooled to 600-750 ℃ for shaping.
  6. 6. The touch screen with the scratch-resistant coating according to claim 3, wherein the annealing treatment in the step S13 is to heat up to 700-780 ℃ and keep the temperature for 5-15 min, then cool down to 500-600 ℃ and keep the temperature for 1-2 h, cool down to room temperature at a cooling rate of 3-8 ℃ per min, and heat up to 250-350 ℃ in an argon atmosphere for sputter deposition for 20-40 min.
  7. 7. The touch screen with the scratch-resistant coating according to claim 1, wherein the preparation method of the scratch-resistant coating comprises the following steps: S21, adding vinyl trimethoxy silane, methyl trimethoxy silane, epoxy trimethoxy silane and toluene into a reaction kettle, dropwise adding 1-2wt% hydrochloric acid for room temperature reaction, heating, dehydrating and polycondensing, standing and separating liquid after the reaction is finished, taking upper liquid, washing the upper liquid to be neutral, adding anhydrous sodium sulfate for removing water, filtering to remove impurities, and performing reduced pressure distillation to obtain polysiloxane; s22, adding polysiloxane, tetrahydrofuran, methacrylic acid and butyl acrylate into a reaction kettle in a nitrogen atmosphere, and adding azodiisobutyronitrile to initiate a reaction to prepare organosilicon emulsion; s23, mixing and modifying the alkaline silica sol and the organic silicon emulsion, standing and curing at room temperature to obtain scratch-resistant coating liquid, mixing the scratch-resistant coating liquid with an amine end-capped curing agent, spraying the mixture onto the surface of the anti-reflection layer of the touch screen, drying at room temperature, and heating and curing to obtain the scratch-resistant coating.
  8. 8. The touch screen with the scratch-resistant coating according to claim 5, wherein the mass ratio of vinyl trimethoxy silane, methyl trimethoxy silane and epoxy trimethoxy silane in S21 is 8.8-9.2:4-4.2:7-7.3, the addition amount of hydrochloric acid is 10-15% of the mass of toluene, the reaction is carried out for 10-30 min at room temperature, and the temperature is raised to 60-70 ℃ for dehydration polycondensation for 1-2 h.
  9. 9. The touch screen with the scratch-resistant coating according to claim 5, wherein the mass ratio of polysiloxane, tetrahydrofuran, methacrylic acid and butyl acrylate in S22 is 1-2:300-600:70-80:20-30, the addition amount of azodiisobutyronitrile is 1-1.5% of the sum of the mass of methacrylic acid and butyl acrylate, the reaction is carried out for 1-2 h at 75-80 ℃, the mass ratio of alkaline silica sol and organic silicon emulsion in S23 is 100:5-10, standing and curing are carried out for 1-2 h at room temperature, the addition amount of amine end-capped curing agent is 3-6% of the scratch-resistant coating liquid, drying is carried out for 10-15 min at room temperature, and the temperature is raised to 120-140 ℃ for curing for 0.5-1 h.

Description

Touch screen with scratch-resistant coating Technical Field The invention belongs to the technical field of touch screens, and particularly relates to a touch screen with a scratch-resistant coating. Background Touch screens, also known as touch panels, touch screens, are an inductive liquid crystal display device. The touch screen mainly comprises a resistive touch screen, a capacitive touch screen, an acoustic wave touch screen and an infrared touch screen, wherein the resistive touch screen deforms the screen through the pressure on the surface of the touch screen, and the purpose of measuring the position is achieved by utilizing the resistance change caused by deformation. The capacitive touch screen generates a coupling capacitance sensing touch position through a human body and an electrode, has the advantages of quick sensing, high precision and long service life, and therefore the capacitive touch screen gradually replaces a resistance touch screen and becomes a main human-computer intelligent interaction tablet product in the market. However, the capacitance of the capacitive touch screen changes with different temperatures, humidity or environmental electric fields, so that the technical problem that the touch screen is invalid due to poor stability and easy abrasion is solved at present. The Chinese patent invention No. CN112860118B discloses a touch screen for projection touch control and a processing technology thereof, the touch screen comprises a touch screen body, the touch screen body comprises a wear-resistant layer, a touch-sensitive layer, a projection display layer and a reinforcing layer, the inner side of the wear-resistant layer is adhered to the outer side of the touch-sensitive layer, the inner side of the touch-sensitive layer is adhered to the outer side of the projection display layer, the inner side of the projection display layer is adhered to the outer side of the reinforcing layer, the touch-sensitive layer comprises a first fixing layer arranged on the outer side of the projection display layer, a magnetic induction layer for forming an induction magnetic field is arranged on the inner side of the first fixing layer, a plurality of first salient points are arranged on the magnetic induction layer in an array manner, an insulating layer is arranged on the inner side of the magnetic induction layer, a second fixing layer is arranged on the inner side of the insulating layer, and a second salient point for carrying out charge exchange with the first salient points so as to form a reinforcing induction magnetic field is arranged on the outer side of the second fixing layer. The invention is a touch screen with high strength, abrasion resistance and sensitivity not affected by the screen size. However, the prior art has the technical problem that the abrasion resistance and scratch resistance of the touch screen are improved by modifying the glass of the touch screen and the components of the surface coating. Disclosure of Invention The invention aims to provide a touch screen with a scratch-resistant coating, which is used for solving the technical problem that the components of glass and a surface coating of the touch screen are not modified in the prior art so as to improve the wear resistance and the scratch resistance of the touch screen. In order to achieve the above purpose, the present invention adopts the following technical scheme: a touch screen with scratch-resistant coating comprises a glass substrate layer, an adhesive layer, a transparent electrode layer, a protective layer, an anti-reflection layer and a scratch-resistant coating from bottom to top; The glass substrate layer is aluminum silicate-borate composite glass with two sides coated with indium tin oxide, the average thickness is 1.6-2 mm, the average thickness of the indium tin oxide coating is 30-40 nm, and the thermal expansion rate is 3X 10 -6/℃~3.3×10-6/°C. The aluminosilicate-borate composite glass comprises 60-65% of silicon dioxide, 12-17% of aluminum oxide, 5-10% of boron oxide, 5-10% of calcium oxide, 4-6% of magnesium oxide, 2-4% of strontium oxide and 0.05-0.1% of zirconium dioxide. The anti-reflection layer comprises a titanium dioxide coating and a silicon dioxide coating from bottom to top, wherein the titanium dioxide coating and the silicon dioxide coating are sequentially coated through magnetron sputtering, the average thickness of the titanium dioxide coating is 70-80 nm, and the average thickness of the silicon dioxide coating is 40-50 nm. The protective layer is microcrystalline glass, and the average thickness is 1-1.5 mm. The adhesive layer is ultraviolet curing optical adhesive of acrylic resin, and the average thickness is 10-15 mu m. The average thickness of the scratch-resistant coating is 1.5-3 mu m. The preparation method of the glass substrate comprises the following steps: s11, according to the chemical composition of the aluminosilicate-borate composite glass, adding the c