KR-102961893-B1 - Anti-glare Surface Treatment method for Synthetic resin substrate

Abstract

The present invention relates to an eco-friendly surface treatment technology for imparting a permanent anti-glare function to the surface of a synthetic resin substrate for a display, comprising an etching step of forming fine irregularities on the surface of the synthetic resin by spraying compressed air and an abrasive through a nozzle, and a surface stabilization step of stabilizing the irregularity structure, thereby enabling the simultaneous securing of permanent anti-glare characteristics and excellent durability of the surface of the synthetic resin substrate.

Inventors

• 정재민

Assignees

• (주)블루디바이스

Dates

Publication Date

20260507

Application Date

20250616

Claims (6)

1. In a method for anti-glare surface treatment of a synthetic resin substrate, (a) A step of preparing a synthetic resin substrate for surface treatment; (b) an ABEP (Abrasive Blast-Etching Process) step of forming fine irregularities on the surface of the substrate by spraying compressed air containing an abrasive at a pressure of 1 to 10 MPa through a nozzle; (c) A first cleaning step for removing abrasives and dust remaining on the substrate; (d) a Surface Stabilization (S/S) step of immersing the cleaned substrate in a stabilizing solution for 5 to 600 seconds to control the haze and transmittance of the substrate; and (e) a second cleaning step for removing the stabilizing solution remaining on the surface of the substrate; comprising, The synthetic resin substrate that has undergone the above S/S step is characterized by having a haze value of 20% to 50% and a transmittance of 85% to 91%. Anti-glare surface treatment method for synthetic resin substrates.
2. In paragraph 1, An anti-glare surface treatment method for a synthetic resin substrate, characterized in that the spray angle of the nozzle is in the range of 45° to 90° and the distance between the nozzle and the substrate surface is 10 to 500 mm.
3. In paragraph 1, The above abrasive comprises at least one selected from the group consisting of silicon carbide (SiC), aluminum oxide ( Al₂O₃ ), diamond powder, and glass beads, and An anti-glare surface treatment method for a synthetic resin substrate, characterized in that the particle size range of the abrasive is 40㎛ to 625㎛.
4. In paragraph 1, The above-described stabilizing solution is prepared by mixing 1 to 10 weight% of sodium hydroxide (NaOH) and 0.5 to 3 weight% of vinyltrimethoxysilane (VTMS) with purified water or isopropyl alcohol (IPA), based on the total weight of the stabilizing solution, in an anti-glare surface treatment method for a synthetic resin substrate.
5. delete
6. delete

Description

Anti-glare Surface Treatment method for Synthetic resin substrate The present invention relates to an anti-glare surface treatment method for a synthetic resin substrate, and more specifically, to a surface treatment method that imparts high durability and permanent anti-glare function by forming fine irregularities on the surface of the synthetic resin through a polishing process. Generally, glass or various synthetic resin materials are used as the top cover of a display screen, and one of the key characteristics required of the cover is anti-glare properties to prevent diffuse reflection and glare on the screen. To secure these anti-glare properties, a method of forming a fine irregular pattern on the glass surface using a wet etching process with hydrofluoric acid (HF) is mainly used. However, hydrofluoric acid (HF) is a highly acidic hazardous substance that can pose a risk to workers and the environment, and the wet etching process has the problem of being difficult to apply to synthetic resin materials other than glass that have low chemical resistance. Therefore, instead of the wet etching process, a coating method that forms a separate anti-glare coating layer on the surface of the synthetic resin is widely adopted as a surface treatment method mainly used for synthetic resin substrates. However, this coating method has limitations in the adhesion and strength of the coating layer itself, and has a problem of reduced wear resistance in which the coating layer is partially damaged or peeled off due to environmental variables such as repeated touch or friction by the user, or changes in temperature and humidity during product use. In particular, there has recently been a trend of display cover materials shifting from glass to synthetic resins (PC, PET, PE, PMMA, SMMA, etc.), and the demand for synthetic resin covers is increasing in flexible displays and lightweight electronic devices. However, as previously explained, since no method for applying permanent anti-glare treatment to synthetic resin substrates is known, most products are released to the market using a coating method, resulting in a persistent problem of deterioration in anti-glare properties over time. Figure 1 is a process flowchart of an anti-glare treatment method for the surface of a synthetic resin substrate. Figure 2 is a schematic diagram showing the process of the ABEP (Abrasive Blast-Etching Process) step. Figure 3 is a diagram showing the surface condition of the synthetic resin after the ABEP step (a) and the S/S (Surface Stabilization) step (b). Figure 4 shows photographs of the surface changes of the synthetic resin after the ABEP step (a) and the S/S step (b). Hereinafter, embodiments of the present invention are described in detail with reference to the drawings so that those skilled in the art can easily implement the present invention. The terms used in this specification are used merely to describe specific embodiments and are not intended to limit the present invention. Unless the context clearly indicates otherwise, the singular expression includes the plural expression. In this application, terms such as "comprising" or "having" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. FIG. 1 is a flowchart of an anti-glare treatment method for a synthetic resin surface according to one embodiment of the present invention. First, in the step of preparing a synthetic resin substrate (S100), a synthetic resin substrate is prepared to undergo surface treatment for exhibiting an anti-glare effect. The synthetic resin to be surface treated may include polycarbonate (PC), polymethyl methacrylate (PMMA), polyimide (PI), polyethylene terephthalate (PET), styrene methyl methacrylate (SMMA), etc., and may be selected according to the application product of the display and required characteristics. It is desirable to perform pretreatment, such as cleaning, to remove dust or contaminants attached to the surface of the substrate before surface treatment, and if necessary, masking work, such as attaching a protective film, may be performed to prevent damage or contamination to the non-processed surface. The following is the ABEP (Abrasive Blast-Etching Process) step (S110) in which an etching phenomenon occurs on the surface of the synthetic resin substrate. This step involves placing the prepared synthetic resin substrate on a fixed jig or stage and processing the surface of the synthetic resin substrate by spraying an abrasive with compressed air using a nozzle inside a sealed chamber to form fine irregularities. The above abrasive is selected according to the type of synthetic resin and the desired surface roughness, and one type of high-hardness particle such as si