KR20230172754A - Preparation method of matt decoration film with shortened curing time - Google Patents

Abstract

The present invention relates to a decoration film, and more specifically, to a method of manufacturing a decoration film with a matte effect using a rubbing method, which can contribute to improving productivity by shortening the curing time.

Description

Manufacturing method of matte effect decoration film with shortened curing time {Preparation method of matt decoration film with shortened curing time}

The present invention relates to a decoration film, and more specifically, to a method of manufacturing a decoration film with a matte effect using a rubbing method, which can contribute to improving productivity by significantly shortening the curing time.

In general, decoration films printed with various patterns are attached to furniture, electronic products, and building materials for interior design purposes, and are used in various fields such as wrapping, window processing, and surface finishing of various electronic products. .

For example, in electronic devices that use glass, interest is increasing in the effects that can be achieved through glass, such as creating a variety of external aesthetics. In particular, technology development regarding glass decoration films or decoration sheets (sometimes referred to as 'decorative films or decorative sheets') is being actively developed. For example, by attaching a decoration film to glass, a metallic texture or three-dimensional effect can be given to the appearance of the electronic device. In particular, the mobile and automobile design fields are increasingly demanding designs that implement dynamic and dramatic effects.

Recently, the design of smartphones or various mobile communication terminals tends to have a simple front window in a single color (e.g. black, etc.) and a back cover design with various colors and various three-dimensional patterns. According to this trend, various methods of implementing decorations to differentiate the back cover are being explored, but there are limitations to the conventional method.

For example, in the case of decoration films, there is a need for a method to implement differentiated decorative aesthetics in which various shapes and depths of various three-dimensional patterns formed on the back are realized.

Meanwhile, matte films are gradually increasing in use because they diffuse external light, preventing eye fatigue seen in glossy films and disclosing packaged contents, and giving elegance to products.

In order to manufacture existing matte films, expensive matte paints were used, but recently, as a more economical method, a rubbing method using patterns that can produce matte effects, anti-fingerprint effects, texture effects, and design haze effects has been used in decoration films. I'm doing it.

In this way, in the matte film manufacturing method using the rubbing method using a pattern, the overall physical properties are maintained or improved compared to existing technologies, while improving productivity and reducing costs through, for example, shortening process steps and process times. There is a need for research and development of technologies and devices that can contribute to .

Republic of Korea Patent Publication No. 10-1231508

The present invention is intended to solve the above problems, and is a decoration film manufacturing method that can contribute to improving productivity by reducing process time or steps in the manufacturing method of a matte effect decoration film by effectively shortening the drying and curing time. It's about.

The above and other objects and advantages of the present invention will become apparent from the following description of preferred embodiments.

The purpose is to prepare a base film; Forming a shielding printed layer on the back of the base film; Forming a coating layer on the entire surface of the base film using a solvent-based resin coating solution and performing primary temporary curing; A step of rubbing a pattern showing a matte effect on the first pre-cured coating layer using a pattern slave; And it can be achieved by a method of manufacturing a matte effect decoration film, including the step of secondary curing the coating layer on which the pattern showing the matte effect is rubbed.

The base film is characterized in that it is a polycarbonate (PC) sheet or a polycarbonate polymethyl methacrylate (PCPMMA) sheet. The base film is characterized in that it has a thickness of 0.5 to 0.8 mm.

The solvent-based resin coating solution is characterized in that it contains 40% by weight of oligomer, 3% by weight of monomer, 0.2% by weight of fluorine, 53.8% by weight of solvent, and 3% by weight of additives. The thickness of the coating layer is 10 to 15㎛.

The first pre-curing is characterized in that the coating layer is formed into a moldable gel state by drying at 60 to 80° C. for 30 seconds to 1.2 minutes using IR (infrared rays).

The secondary temporary hardening is characterized in that it is performed by irradiating with a light amount of 100 to 150 mJ/cm ² and an illuminance of 50 to 80 mW/cm ² using an LED, etc.

Before forming a shielding printed layer on the back of the base film, forming a UV pattern layer on the back of the base film for various refraction effects and forming a deposition layer on the UV pattern layer. Do it as

According to the present invention, in the production of a matte effect decoration film through a rubbing method using a pattern, the physical properties, especially the surface properties, are maintained or maintained compared to existing technologies through the use of solvent-based resin during the slot die coating process. By effectively shortening the IR drying time while improving the efficiency, it can have the effect of increasing productivity compared to existing methods.

In addition, according to the present invention, a matte film can be economically mass-produced by exhibiting a matte effect through a rubbing process using a pattern. Therefore, in an economical way, it is possible to display an anti-fingerprint effect due to the matte effect, a texture effect with excellent slipperiness, and a design haze effect on the front surface of the decoration film. The pattern can be used in various shapes to realize not only the matte effect but also various designs. You can.

Additionally, by forming a coating layer with a matte effect pattern on the base film, durability against everyday scratches can be enhanced. Furthermore, by performing an additional UV molding process and deposition process on the back of the base film, the matte effect and the effect of the UV pattern layer can be combined to create a new visual effect.

However, the effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

Figure 1 is a schematic diagram sequentially showing the manufacturing steps of a matte effect decoration film according to an embodiment of the present invention.
Figure 2 is a schematic diagram showing the decomposition of each layer of the matte effect decoration film manufactured according to an embodiment of the present invention.
Figure 3 shows actual photos of a matte effect decoration film implemented on a smartphone back cover according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to embodiments of the present invention and drawings. These examples are merely presented as examples to explain the present invention in more detail, and it will be apparent to those skilled in the art that the scope of the present invention is not limited by these examples. .

Additionally, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains, and in case of conflict, this specification including definitions The description will take precedence.

In order to clearly explain the proposed invention in the drawings, parts unrelated to the description have been omitted, and similar reference numerals have been assigned to similar parts throughout the specification. And, when it is said that a part "includes" a certain component, this means that it does not exclude other components, but may further include other components, unless specifically stated to the contrary. Additionally, “unit” as used in the specification refers to a unit or block that performs a specific function.

Identification codes (first, second, etc.) for each step are used for convenience of explanation. The identification codes do not describe the order of each step, and each step does not clearly state a specific order in context. It may be carried out differently from the order specified above. That is, each step may be performed in the same order as specified, may be performed substantially simultaneously, or may be performed in the opposite order.

One aspect of the present application includes preparing a base film; Forming a shielding printed layer on the back of the base film; Forming a coating layer on the entire surface of the base film using a solvent-based resin coating solution and performing primary temporary curing; A step of rubbing a pattern showing a matte effect on the first pre-cured coating layer using a pattern slave; And providing a method for manufacturing a matte effect decoration film, including the step of secondary curing the coating layer on which the pattern showing the matte effect is rubbed.

Hereinafter, implementation examples and examples of the present application will be described in detail with reference to the attached drawings. However, the present disclosure may not be limited to these implementations, examples, and drawings.

Figure 1 is a schematic diagram sequentially showing the manufacturing steps of a matte effect decoration film according to an embodiment of the present invention.

Referring to (a) of FIG. 1, the base film 200 may be prepared. The base film 200 is preferably a polycarbonate (PC) sheet or a polycarbonate polymethyl methacrylate (PCPMMA) sheet.

PC (Polycarbonate) sheet is a type of thermoplastic plastic and has characteristics such as impact resistance, heat resistance, weather resistance, self-extinguishing, and transparency. It has an impact resistance of about 150 times that of tempered glass, and has excellent flexibility and processability. It is often used as a substitute for acrylic, which is easily brittle and deformed, and as a supplement to general plate glass.

PCPMMA (Polycarbonate Polymethyl methacrylate) sheet is a type of special resin made by compressing PC (Polycarbonate) and PMMA (Polymethyl methacrylate) to form a composite sheet.

PMMA is a type of special resin, a polymer component of methyl methacrylate, and is characterized by excellent optical properties, weather resistance, surface strength, hardness, and moldability.

Meanwhile, the base film 200 preferably has a thickness of 0.5 to 0.8 mm. If this range is outside this range, the formable curvature radius of the film outer shell is limited during the subsequent forming process, causing difficulties in implementing various designs, and cracking occurs in the UV pattern layer and deposition layer.

Next, a shielding printed layer 100 can be formed on the back of the base film 200.

The shielding printed layer 100 functions to block the transmission of light, and can be implemented by printing a dark color, preventing the lower side of the shielding printed layer from being transparent when viewed from the top of the decoration film according to the present invention. . As an example, the shielding printed layer 100 may be a silk printed layer formed using a silk screen printing method. The shielding printed layer may be formed to have a thickness of 15 to 25 ㎛.

Next, referring to (b) of FIG. 1, a coating layer 300 may be formed on the entire surface of the base film 200. The coating layer 300 may be formed on the entire surface of the base film 200 to form a pattern showing a matte effect. The coating layer 300 may be formed using a solvent-based resin coating solution.

The coating layer 300 may be formed through a coating method such as a slot die, but is not limited thereto, and may be formed using a coating method commonly used in the art.

After application for coating, the coating layer 300 can be initially pre-cured into a moldable gel state to enable rubbing in the next process, the rubbing step. The first temporary hardening may be performed by hot air drying at about 60 to 80° C. using IR (infrared rays). If the temperature is outside the above range, curing may be insufficient and the pattern slave may later stick to the coating layer, or curing may proceed excessively, preventing rubbing.

At this time, the drying time of the first temporary curing can be shortened to 1 minute or less, specifically, a short time of 30 seconds to 1.2 minutes by using the solvent-type resin coating solution according to an embodiment of the present invention. .

Specifically, the solvent-type resin coating solution is a quick-drying solvent-type resin with a faster volatilization rate than a general UV coating solution. In the process of solvent volatilization (C in Figure 1), the fluorine component floats and is fully cured in an open state. By doing so, the drying time required for pre-curing can be significantly shortened from about 4.5 minutes (conventional) to 60 seconds, and the application time of the resin coating solution can also be shortened from about 27 seconds (conventional) to 12 seconds, thereby reducing the delay time. can solve the problem. As a result, it is possible to significantly increase production efficiency and secure more improved surface properties compared to existing products, such as reduction in thickness and improvement in air bubble problems.

The solvent-based resin coating solution contains, based on the total weight, 40 to 50% by weight of an oligomer containing polyurethane acrylate, for example, 40% by weight, and 2 to 7% by weight of a monomer containing dipentaerythritol hexaacrylate (DHPA). %, for example, 3% by weight, fluorine agent 0.1 to 3% by weight, for example, 0.2% by weight, solvent including acetone (ACETONE), ethyl acetate (ETHYL ACETATE) or a combination thereof 50 to 60% by weight, example As such, it may contain 53.8% by weight, 1 to 5% by weight of additives including an initiator, etc., for example, 3% by weight.

The coating layer 300 is preferably formed to a thickness of 10 to 15 ㎛, for example, to enable rubbing when performing the rubbing step later.

Next, a pattern showing a matte effect can be rubbed on the first pre-cured coating layer 300 (d in FIG. 1) using a pattern slave.

The rubbing may be performed using a conventional rubbing device in the art including a pattern slave. For example, in the rubbing device, the first pre-cured coating layer 300 on the base film is pressed to the pattern slave, and the pattern may be rubbed on the coating layer 300.

When the base film 100 on which the first pre-cured coating layer 300 is formed is introduced into the rubbing device, the pattern slave moves toward the pressure roller. At this time, components within the device for moving the pattern slave may have a roll or belt shape.

The pattern slave may exhibit various pattern shapes. The pattern slave may be made of polyurethane (Thermo Plastic Polyurethane (TPU)) or polyethylene terephthalate (PET), which has good thermoplasticity, and may have a thickness of 0.1 to 0.25 mm.

Specifically, the pattern slave is placed on the upper pressure roller with the pattern shape exposed as the protective film attached to the front is removed through a protective film remover. Thereafter, the pattern slave is brought into contact with the coating layer on the base film that is input to the pressure roller, and the base film and the pattern slave are pressed together in a contact state by the upper pressure roller and the lower pressure roller, thereby forming a pattern on the coating layer 300. This can be rubbed.

Next, the coating layer on which the pattern is rubbed can be subjected to secondary temporary hardening. The secondary temporary hardening is performed by irradiating an LED, etc. immediately after the rubbing, and allows the rubbed pattern to remain fixed.

The secondary temporary hardening may be performed by irradiating, for example, an LED at a light quantity of 100 to 200 mJ/cm ² and an illumination intensity of 50 to 80 mW/cm ² . If it is outside the above range, the secondary pre-curing is not carried out effectively, so when the pattern slave is later removed, the rubbed pattern is deformed, or the pattern slave is bonded to the top coating layer, making removal difficult.

Next, the decoration film on which the coating layer is formed may be further subjected to a forming process to mold the outer shell of the film into a curved shape.

At this time, the forming process can be performed by heating and pressing the patterned coating layer through the secondary pre-cured decoration film between the upper and lower molds forming the molding space of the upper back cover.

Next, the pattern slave can be removed from the coating layer and completely cured. Removal of the pattern slave may be performed by a physical method commonly used in the art.

After removing the pattern slave, the coating layer can be completely cured. At this time, the complete curing can be performed by irradiating with a mercury lamp at, for example, 950 to 1200 mJ/cm ² and an illuminance of 200 to 250 mW/cm ² . This complete curing process can be repeated two or more times, preferably about three times.

Afterwards, a step of cutting the decoration film in which the patterned coating layer is fully cured can be performed. In the cutting step, the decoration film may be cut using equipment such as CNC or laser, depending on the shape and size of the adherend.

Meanwhile, in the method of manufacturing a matte effect decoration film according to the present invention, before forming the shielding printing layer 100 on the back of the base film 200, a UV pattern layer is placed on the back of the base film for various refractive effects. It may further include forming a deposition layer on the UV pattern layer.

The UV pattern layer serves to represent a three-dimensional design pattern, or to represent the visibility and colorful refractive effects of the matte effect coating layer 300 formed later.

The UV pattern layer can be formed by UV molding to have a predetermined pattern shape using a transparent UV pattern molding paint. At this time, the predetermined pattern shape may include a variety of pattern shapes, including super precision machine patterns and hologram patterns. In addition, any UV pattern shape that is obvious to a person skilled in the art can be applied. At this time, the manufacturing method may be a UV molding method using a micro optical mold.

When a UV pattern layer is formed using the UV molding method, aesthetics can be improved by enabling various design expressions depending on the angle of light.

The paint for UV pattern forming may contain a binder material. The binder material includes epoxy resin, acrylic resin, polyolefin resin, polyamide resin, polyester resin, polyvinyl chloride resin, polyvinyl acetate resin, petroleum resin, phenolic resin, polystyrene resin, and It may contain at least one of urethane-based resins.

The UV pattern layer may have a first translucent color. Additionally, the UV pattern layer is provided with a predetermined receiving groove and can be used as a space filled with ink having a second translucent color, which is a tint color different from the first translucent color.

In addition, the UV pattern layer includes both color and pattern by forming a fine pattern on the surface after forming a photocurable resin layer by applying a photocurable resin composition for UV molding, thereby providing two-tone colors, multi-colors, and a sense of depth. A variety of colors and patterns can be expressed, which can dramatically improve aesthetics.

Next, a deposition layer can be formed on the UV pattern layer.

The deposition layer is performed to protect the UV pattern layer and to clearly display the three-dimensional effect caused by the UV pattern layer. The deposition layer can be formed in the form of an inorganic thin film on the UV pattern layer using a deposition method commonly used in the industry, such as a Non Conductive Vacuum Metallization (NCVM) method including physical or chemical vapor deposition. .

When depositing an oxide semiconductor or GaAs on a substrate, the physical vapor deposition method melts the compounds, prepares them as a solid target, volatizes them with heat or an electron beam, and deposits them on the substrate. At this time, the raw material is blown into a gaseous state through heat, laser, electron beam, etc., and when the blown gaseous raw material touches the substrate, it changes into a solid state.

The chemical vapor deposition method is an industrial method of creating a thin film of silicon, etc., on a substrate using a chemical reaction in the manufacturing process of ICs. It is used to make silicon oxide films, silicon nitrogen films, and amorphous silicon thin films. When energy is applied to a gas containing a chemical substance through heat or light, or when it is turned into a plasma using high frequency, the raw material is radicalized, greatly increasing its reactivity, and adsorbed and deposited on the substrate.

Additionally, the deposition layer can be formed as a color deposition layer, for example, a gradient deposition layer, to improve aesthetics in various colors such as two-tone colors, multi-colors, and colors with various depths. For example, the gradient deposition layer may be formed using conventional electron beam deposition equipment.

Figure 2 is a schematic diagram showing the decomposition of each layer of the matte effect decoration film manufactured according to an embodiment of the present invention.

Referring to Figure 2, the matte effect decoration film includes a base film, a UV pattern layer sequentially formed on the back of the base film; deposition layer; and a shielding printed layer, and may include a coating layer (UV pattern) that exhibits a matte effect formed on the entire surface of the base film.

Figure 3 shows actual photos of a matte effect decoration film implemented on a smartphone back cover according to an embodiment of the present invention.

Referring to Figure 3, the decoration film manufactured in this way is expressed in various colors showing a matte effect, as shown in Figure 3, and the effect of the UV pattern layer is combined to produce various effects.

Hereinafter, the configuration of the present invention and its effects will be described in more detail through specific examples and comparative examples. However, these examples are for illustrating the present invention in more detail, and the scope of the present invention is not limited to these examples.

<Experimental Example 1: Curing time measurement evaluation>

Using the above-described example of a quick-drying solvent-type resin coating solution and the comparative example of a conventional coating solution (fast-drying solvent), the process steps for forming a pattern were resin application, slot die coating, and IR drying (primary pre-curing). , secondary pre-curing, and peeling (pattern slave removal) steps were performed respectively, and the time (unit: sec) required for each step was measured. (However, the secondary pre-curing time was excluded.) The results are as follows. It is shown in Table 1.

Referring to Table 1, compared to the comparative example of the existing coating solution (fast-drying solvent), it was confirmed that the shortening of the process time in the resin application, IR drying, and peeling steps was significantly improved by using a quick-drying solvent-type resin coating solution in the example. .

<Experimental Example 2: Evaluation of physical properties>

For the examples and comparative examples of Experimental Example 1, and the control group using a third-party resin product (CICAI), after completing pattern formation, physical properties related to surface characteristics such as bubbles, contact angle, pencil hardness, chemical resistance, and steel wool were examined. were measured and compared. The evaluation method for each item was performed according to known techniques, and the results are shown in Table 2 below.

Referring to Table 1 and Table 2 together, the Example shows a significantly superior effect in reducing the process time, especially the curing time, compared to the Comparative Example, while the overall surface properties are also improved compared to the Control and Comparative Examples. It was confirmed that .

Optimal embodiments are disclosed in the drawings and specification. Although specific terms are used here, they are used only for the purpose of explaining the present invention and are not used to limit the meaning or scope of the present invention described in the claims. Therefore, those skilled in the art will understand that various modifications and other equivalent embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the attached patent claims.

100: shielding printed layer 200: base film
300: coating layer

Claims (8)

Preparing a base film;
Forming a shielding printed layer on the back of the base film;
Forming a coating layer on the entire surface of the base film using a solvent-based resin coating solution and performing primary temporary curing;
A step of rubbing a pattern showing a matte effect on the first pre-cured coating layer using a pattern slave; and
A method of manufacturing a matte effect decoration film comprising: secondary curing the coating layer on which a pattern showing a matte effect is rubbed. According to paragraph 1,
A method of manufacturing a matte effect decoration film, wherein the base film is a polycarbonate (PC) sheet or a polycarbonate polymethyl methacrylate (PCPMMA) sheet. According to paragraph 1,
A method of manufacturing a matte effect decoration film, characterized in that the base film has a thickness of 0.5 to 0.8 mm. According to paragraph 1,
The solvent-based resin coating solution is characterized in that it contains 40% by weight of oligomer, 3% by weight of monomer, 0.2% by weight of fluorine, 53.8% by weight of solvent, and 3% by weight of additives. According to paragraph 1,
A method of manufacturing a matte effect decoration film, characterized in that the thickness of the coating layer is 10 to 15㎛. According to paragraph 1,
The first temporary curing is a method of producing a matte effect decoration film, characterized in that the coating layer is formed into a moldable gel state by drying at 60 to 80 ° C. for 30 seconds to 1.2 minutes using IR (infrared rays). According to paragraph 1,
The secondary temporary curing is characterized in that it is performed by irradiating with a light amount of 100 to 150 mJ/cm ² and an illuminance of 50 to 80 mW/cm ² using an LED, etc. A method of producing a matte effect decoration film. According to paragraph 1,
Before forming a shielding printed layer on the back of the base film,
A method of manufacturing a matte effect decoration film, characterized in that it further comprises the step of forming a UV pattern layer on the back of the base film and forming a deposition layer on the UV pattern layer for various refraction effects.