Search

CN-122011960-A - Pressure-sensitive adhesive protective film for ITO glass and preparation method thereof

CN122011960ACN 122011960 ACN122011960 ACN 122011960ACN-122011960-A

Abstract

The invention discloses a pressure-sensitive adhesive protective film for ITO glass, which comprises a polyester film substrate and an organic silicon pressure-sensitive adhesive layer coated on the surface of the polyester film substrate, wherein the organic silicon pressure-sensitive adhesive layer is formed by coating and curing a mixture, the mixture comprises 90-150 parts of high-vinyl silicone oil, 90-150 parts of MQ silicone resin, 10-14 parts of a hydrogen polysiloxane cross-linking agent, 5-12 parts of a nano SiO 2 filler, 4-10 parts of a nano Al 2 O 3 filler, 0.2-0.8 part of an anchoring agent and 2-3 parts of an antistatic agent, and the vinyl content of the high-vinyl silicone oil is 0.5-1.2 mmol/g. Through the mode, the pressure-sensitive adhesive protective film for the ITO glass and the preparation method thereof are designed through an innovative material formula system and a fine process, the manufactured protective film overcomes the defects generated when the conventional pressure-sensitive adhesive protective film is used for the ITO glass, and achieves extremely low film tearing voltage, controllable and stable moderate viscosity and high light transmittance while ensuring excellent scratch resistance.

Inventors

  • DENG PEIHUA

Assignees

  • 太仓新宏电子科技有限公司

Dates

Publication Date
20260512
Application Date
20260304

Claims (8)

  1. 1. The pressure-sensitive adhesive protective film for the ITO glass comprises a polyester film base material and an organic silicon pressure-sensitive adhesive layer coated on the surface of the polyester film base material, and is characterized in that the organic silicon pressure-sensitive adhesive layer is formed by coating and curing a mixture; The mixture comprises 90-150 parts of high vinyl silicone oil, 90-150 parts of MQ silicone resin, 10-14 parts of hydrogen polysiloxane crosslinking agent, 5-12 parts of nano SiO 2 filler, 4-10 parts of nano Al 2 O 3 filler, 0.2-0.8 part of anchoring agent and 2-3 parts of antistatic agent; the vinyl content of the high-vinyl silicone oil is 0.5 mmol/g-1.2 mmol/g.
  2. 2. The protective film for pressure-sensitive adhesive of ITO glass according to claim 1, wherein the thickness of said polyester film substrate is 25 μm to 100 μm, and the elastic modulus is not lower than 4.0Gpa.
  3. 3. The pressure-sensitive adhesive protective film for ITO glass according to claim 1, wherein the average particle size of the nano SiO 2 filler is 10 nm-50 nm.
  4. 4. The pressure-sensitive adhesive protective film for ITO glass according to claim 1, wherein the average particle size of the nano Al 2 O 3 filler is 20-80 nm.
  5. 5. The protective film for pressure sensitive adhesive of ITO glass of claim 1, wherein 2% of organosilicon surfactant is added in the antistatic agent.
  6. 6. The pressure-sensitive adhesive protective film for ITO glass of claim 1, wherein the pressure-sensitive adhesive protective film is used by plasma treatment of the ITO glass surface.
  7. 7. The protective film for pressure-sensitive adhesive of ITO glass of claim 6, wherein the surface energy of the ITO glass after plasma treatment is more than 79 mJ/m.
  8. 8. The method for preparing the pressure-sensitive adhesive protective film for ITO glass according to claim 1, wherein the method comprises the following specific steps: 1) Pretreating, namely carrying out surface treatment on the nano SiO 2 filler and the nano Al 2 O 3 filler by using a vinyl silane coupling agent, and drying for later use; 2) Preparing glue, namely uniformly dispersing the high vinyl silicone oil, the MQ silicone resin, the treated nano SiO 2 filler, the treated nano Al 2 O 3 filler, the anchoring agent and the antistatic agent in a planetary mixer at a high speed to form a main agent, then adding the hydrogen polysiloxane cross-linking agent, uniformly stirring at a medium-low speed, and then performing vacuum defoaming to obtain glue solution; 3) The substrate treatment, namely firstly coating a layer of thin silane coupling agent on the corona treatment surface of the polyester film substrate in a micro gravure coating mode, and drying for 20-40 seconds at 80-120 ℃ to form an undercoat; 4) Coating and curing, namely coating the glue solution prepared in the step 2) on the bottom coating formed in the step 3), controlling the thickness of a wet film to be 50 mu m, then placing the coated film material in a hot air circulation oven, curing for 90-110 seconds at 140-150 ℃, forming an organosilicon pressure-sensitive adhesive layer with the dry film thickness of 25 mu m, and rolling to obtain a protective film finished product.

Description

Pressure-sensitive adhesive protective film for ITO glass and preparation method thereof Technical Field The invention belongs to the technical field of protective films, and particularly relates to a pressure-sensitive adhesive protective film for ITO glass and a preparation method thereof. Background In the manufacturing process of electronic products such as flat panel display and touch panel, the ITO conductive glass is one of key base materials, in order to prevent the ITO conductive glass from being scratched, polluted and electrostatically damaged in the transportation, storage and processing links, a temporary protective film is generally required to be attached to the surface of the ITO, the protective film is required to have excellent anti-friction and scratch resistance so as to resist external hard object scratch, and secondly, the protective film is required to have proper and stable adhesive force, so that the edge of the ITO conductive glass is not warped and does not fall off in the processing process, and the ITO conductive glass can be easily and cleanly stripped, no residual glue is generated or damage is caused to the lower structures such as an ITO layer and a polaroid, and furthermore, the protective film is required to have high light transmittance and low haze so as not to influence the optical detection and the final optical performance of the product, and in addition, the protective film is required to have an antistatic function so as to eliminate poor appearance or potential scratch caused by electrostatic dust absorption. Some protective films on the market at present are difficult to combine the properties, and the addition of excessive rigid filler or the increase of crosslinking density for pursuing high hardness and scratch resistance often leads to embrittlement, reduced flexibility, easy breakage or residual internal stress during peeling, and simultaneously may unbalance viscosity, excessive peeling force or residual glue. The traditional organic silicon pressure-sensitive adhesive has higher curing temperature (usually more than 160 ℃) and can have adverse effects on the conductivity of an ITO layer and the stability of glass in a long-time high-temperature environment, and in addition, a common protective film can easily generate electrostatic voltage of hundreds or even kilovolts when peeled off, so that the risk of adsorbing dust or triggering electric shock to damage sensitive elements exists. Disclosure of Invention The invention mainly solves the technical problem of providing a pressure-sensitive adhesive protective film for ITO glass and a preparation method thereof, and can solve the defects generated when the conventional pressure-sensitive adhesive protective film is used for ITO glass. In order to solve the technical problems, the invention adopts a technical scheme that the pressure-sensitive adhesive protective film for ITO glass comprises a polyester film base material and an organic silicon pressure-sensitive adhesive layer coated on the surface of the polyester film base material, wherein the organic silicon pressure-sensitive adhesive layer is formed by coating and solidifying a mixture; The mixture comprises 90-150 parts of high vinyl silicone oil, 90-150 parts of MQ silicone resin, 10-14 parts of hydrogen polysiloxane crosslinking agent, 5-12 parts of nano SiO 2 filler, 4-10 parts of nano Al 2O3 filler, 0.2-0.8 part of anchoring agent and 2-3 parts of antistatic agent; the vinyl content of the high-vinyl silicone oil is 0.5 mmol/g-1.2 mmol/g. In a preferred embodiment of the present invention, the thickness of the polyester film substrate is 25 μm to 100 μm, and the elastic modulus is not lower than 4.0Gpa. In a preferred embodiment of the present invention, the average particle size of the nano SiO 2 filler is 10nm to 50nm. In a preferred embodiment of the present invention, the average particle size of the nano Al 2O3 filler is 20nm to 80nm. In a preferred embodiment of the present invention, 2% of silicone surfactant is added to the antistatic agent. In a preferred embodiment of the present invention, the pressure sensitive adhesive protective film is used by plasma treatment of the ITO glass surface. In a preferred embodiment of the invention, the surface energy of the ITO glass after plasma treatment is more than 79 mJ/m. The preparation method of the pressure-sensitive adhesive protective film for the ITO glass comprises the following specific steps of: 1) Pretreating, namely carrying out surface treatment on the nano SiO 2 filler and the nano Al 2O3 filler by using a vinyl silane coupling agent, and drying for later use; 2) Preparing glue, namely uniformly dispersing the high vinyl silicone oil, the MQ silicone resin, the treated nano SiO 2 filler, the treated nano Al 2O3 filler, the anchoring agent and the antistatic agent in a planetary mixer at a high speed to form a main agent, then adding the hydrogen polysiloxane cross-linking agent, uni