KR20240046345A - Release Paper For Fabricating of Protection Film and Method of fabricating the same - Google Patents

Abstract

A method for manufacturing release paper for manufacturing a protective film is disclosed. The release paper manufacturing method includes preparing a release silicone solution containing a first base polymer mainly composed of polydimethylsiloxane and a solvent, and preparing an adhesive silicone solution containing a second base polymer mainly composed of trimethylated silica and polydimethylsiloxane and a solvent. Preparing a solution, mixing 94.0 to 97.0% by weight of the release silicone solution, 1.5 to 4.5% by weight of the adhesive silicone solution, 0.1 to 0.3% by weight of the crosslinker, and 0.9 to 1.4% by weight of the catalyst to prepare a hybrid silicone solution. , coating the base member with the mixed silicon solution and heating the base member coated with the mixed silicon solution.

Description

Release paper for fabricating a protective film and its manufacturing method {Release Paper For Fabricating of Protection Film and Method of fabricating the same}

The present invention relates to a release paper for manufacturing a protective film for protecting finished products, such as mobile phones, and a method for manufacturing the same.

After high-priced products such as mobile phones are finally manufactured on the production line, they are placed in individual boxes with a PET protective film attached for sale to customers. At this time, the protective film is subjected to perforation and cutting processing using a knife mold according to the shape of the product, and a printing process according to the product specifications.

The processing and printing process is performed with a release paper called a carrier film attached to one side of the protective film. After the processing and printing process for the protective film, the release paper is removed from one side of the protective film. However, a double-sided adhesive layer is provided along the outer edge between the protective film and the release paper, so if the adhesive force of the silicone layer of the release paper is strong, there is a problem that the double-sided adhesive layer on the protective film is damaged or the residual adhesive strength is reduced when the release paper is separated after the process. . In addition, taking these problems into account, lowering the release force of the release paper can prevent damage to the double-sided adhesive layer or a decrease in residual adhesive strength during separation, but its adhesion to the protective film is low, making it possible to smoothly perform the processing and printing process of the protective film. I can't.

The object of the present invention is a release paper for manufacturing a protective film that can smoothly perform the processing and printing process of the protective film while satisfying both adhesion and release properties suitable for preventing damage to the adhesive layer on the protective film or reduction of residual adhesive strength during separation, and a method for manufacturing the same. There is a day to offer.

A method for manufacturing release paper for manufacturing a protective film is provided to achieve the above-described object of the present invention. The release paper manufacturing method includes preparing a release silicone solution containing a first base polymer mainly composed of polydimethylsiloxane and a solvent, and preparing an adhesive silicone solution containing a second base polymer mainly composed of trimethylated silica and polydimethylsiloxane and a solvent. Preparing a solution, mixing 94.0 to 97.0% by weight of the release silicone solution, 1.5 to 4.5% by weight of the adhesive silicone solution, 0.1 to 0.3% by weight of the crosslinker, and 0.9 to 1.4% by weight of the catalyst to prepare a hybrid silicone solution. , coating the base member with the mixed silicon solution and heating the base member coated with the mixed silicon solution.

The release silicone solution may include 30% by weight of polydimethylsiloxane and 70% by weight of the solvent, and the adhesive silicone solution may include 30% by weight of polydimethylsiloxane, 30% by weight of trimethylated silica, and 40% by weight of the solvent.

The protective film includes an acrylic adhesive provided on one side, has a release force of 20-30 gf with respect to the acrylic adhesive, and may have an adhesion force of 3-4.5 gf with respect to the protective film.

Release paper for manufacturing a protective film according to an embodiment of the present invention is provided. The release paper includes a base member and an adhesive release layer applied to one surface of the base member. The adhesive release layer is composed of 94.0 to 97.0% by weight of a release silicone solution containing a first base polymer mainly composed of polydimethylsiloxane and a solvent, and a second base polymer mainly composed of trimethylated silica and polydimethylsiloxane and a solvent. It is formed by applying a mixed silicone solution containing 1.5 to 4.5% by weight of an adhesive silicone solution, 0.1 to 0.3% by weight of a crosslinker, and 0.9 to 1.4% by weight of a catalyst.

The release silicone solution may include 30% by weight of polydimethylsiloxane and 70% by weight of the solvent, and the adhesive silicone solution may include 30% by weight of polydimethylsiloxane, 30% by weight of trimethylated silica, and 40% by weight of the solvent.

The adhesive release layer may include polydimethylsiloxane and trimethylated silica in a ratio of 28.65 to 30.45: 0.45 to 1.35.

The protective film includes an acrylic adhesive provided on one side, and the adhesive release layer may have a release force of 20-30 gf with respect to the acrylic adhesive and an adhesion force of 3-4.5 gf with respect to the protective film.

The release paper for manufacturing a protective film according to an embodiment of the present invention has an adhesive strength sufficient to smooth the perforation and cutting process of the protective film, and a release strength sufficient to prevent damage to the double-sided adhesive layer when separating the release paper from the protective film. has

Figure 1 is a diagram showing a state in which a release paper according to an embodiment of the present invention is applied to a protective film.
FIG. 2 is a diagram showing a cross-sectional structure cut along line AA in FIG. 1.

Figure 1 is a diagram showing a state in which the release paper 2 according to an embodiment of the present invention is applied to the protective film 1, and Figure 2 is a diagram showing a cross-sectional structure taken along line A-A of Figure 1.

The smartphone that has been manufactured is wrapped in a processed protective film (1) and placed in a box. Of course, the use of the protective film 1 is not limited to smartphones and can be used in a variety of products.

The protective film (1) is made of transparent PET, and is perforated, cut, and printed during the manufacturing process to cover the finished smartphone for sale to customers. The PET protective film 1 is perforated and cut with a knife mold while being laminated with the release paper 2 according to an embodiment of the present invention, and is printed, for example, by silk screen printing.

The protective film 1 shown in Figure 1 is cut into a developed shape suitable for covering the front, back, and sides of a product, for example, a smartphone. An acrylic adhesive (11) is provided on one side of the protective film (1).

The protective film (1) includes perforations (12-1, 12-2) and a printing area (13) cut out in areas corresponding to the side buttons (volume button, on/off button) of the smartphone.

The release paper 2 according to an embodiment of the present invention includes a base member ( 21) and an adhesive release layer 22 coated on the first PE layer 21-2. The adhesive release layer 22 is attached to the acrylic adhesive 11 and the PET material. At this time, the adhesive release layer 22 has a release force that does not damage or damage the residual adhesive strength to the acrylic adhesive 11 and an adhesive strength to the extent that it can perform the processing or printing process of the protective film 1 to the PET material. It is required.

Specific properties of the release paper 2 according to the embodiment of the present invention were measured in the following manner.

(1) Liner Release (release force) test method: Peel off the release paper at a certain angle and pull it.

① Equipment name: AR-1000(TLMI) / Manufacturer ChemInstruments

② Sample size: 25mm × 300mm

③ Measurement standard tape: Tesa 7475 (25.4mm) (acrylic adhesive)

④ Test conditions

- unit: gf/inch

- Test angle and speed (release paper peeling standard/release paper peeling): 180° Peel, 300mm/min (low-speed peeling)

⑤ Test method

- Attach Tesa tape to the release paper to be measured according to the specifications. Measure the width in three places: left, center, and right.

- Compress by passing a pressure roll (automatic reciprocating roller, pressure = 4kg/㎠) twice.

- Pre-treat with a 5kg load (33.3g/㎠) for 24 hours (left at room temperature).

- After fixing the release paper on the grip of the measuring device, peel it at 180°Peel, 300mm/min (low speed peeling).

(2) Measurement of residual adhesion (SAS=Subsequent Adhesion Strength)

① Equipment name: Adhesion/Release tester, Model: AR-1000/TLMI, Manufacturer: Cheminstruments (made IN U.S.A.), Other equipment: Calibration bracket, Wire

② Sampling:

- Sample dimensions: width 25mm, length (longitudinal direction (MD)) 175mm

- Make the cut clean and straight.

- Prepare one sample each from left to right, left to middle, center, center to right, and right from full width. Alternatively, three specimens are possible: left, middle, and right.

③ Measurement standard tape: Tesa 7475 (25mm) (acrylic adhesive)

④ Test conditions

- 23± 2℃/ 55±5%RH

- Test samples are maintained under test conditions for more than 20 hours before testing.

⑤ Test method

- Press the standard tape (Nitto-31B) on the surface of the silicone-treated release paper with a 2kg rubber roll in one round and round motion.

- Compress the standard tape (Nitto-31B) on the surface of the Teflon sheet with a 2kg rubber roll once.

- 70g/㎠ (pressurized), pretreated at 70℃ for 20 hours and then stabilized at room temperature for 4 hours (can be left at room temperature).

- After stabilization, remove the standard tape (Nitto-31B) from the Teflon sheet and press it back and forth once with a 2kg rubber roll on the surface of the standard SUS panel.

- Measure the adhesive force by peeling off the standard tape (Nitto-31B) at 180° and 300mm/min.

- Residual adhesive force: (Standard tape residual adhesive force of release film/(Standard tape residual adhesive force of Teflon sheet) × 100 (Unit: %)

- Measure the residual adhesion 5 times for each measurement specimen.

(3) PET Adhesion Strength

① Equipment name: AR-1000(TLMI) / Manufacturer ChemInstruments

② Sample size: 25mm × 300mm

③ Measurement standard: PET (50㎛) protective film

④ Test conditions

- unit: gf/5inch

- The temperature of the test site is 23±3℃ and the relative humidity is 50±20%.

- Test angle and speed (release paper peeling standard/release paper peeling): 180°, 300mm/min (low-speed peeling)

⑤ Test method

- Place untreated PET (50㎛) on the silicone coated surface of the release paper.

- Compress by passing a pressure roll (automatic reciprocating roller, pressure = 4kg/㎠) twice.

- Leave in compressed state at room temperature for 10 seconds.

- After 10 seconds, check the silicone coating surface and the adhesion state to PET and judge it as good - normal - weak - NG.

- After fixing the release paper on the grip of the measuring device, peel it off at 180°, 300 mm/min (low speed peeling).

The adhesive release layer 22 of the release paper 2 according to an embodiment of the present invention is manufactured by the following method.

The release silicone solution is KS-847H from Shin-Etsu Korea, which contains 30% by weight of polydimethylsiloxane and 70% by weight of solvent.

The adhesive silicone solution is Dow Corning's 7656, which contains 30% by weight of polydimethylsiloxane, 30% by weight of trimethylated silica, and 40% by weight of solvent.

Crosslinker is an additive synthesized through the main reaction of “OH reactor” and is a substance that improves the adhesion performance of the base material and coating agent.

Platinum chelade catalyst is an addition reaction type catalyst that uses platinum as its main ingredient.

[Example 1]

By selecting 2.5% by weight from 73.5 to 98.5% by weight of the release silicone solution and 2.5% by weight from 0 to 25% by weight of the adhesive silicone solution, and adding 0.2% by weight of crosslinker and 1.3% by weight of platinum chelade catalyst, various types of Prepare samples of mixed silicon solution. Each hybrid silicone solution sample was coated on the base member (21 in FIG. 2) in an application amount of 0.43 g and dried by heating to form samples of the adhesive release layer 22. Samples of each adhesive release layer 22 were tested for release properties against acrylic adhesives and adhesion to PET film. Release property was measured by pressing and attaching each sample to the Tesa tape and then checking the damage (release property N) of the Tesa tape when peeled off at 180 degrees. Adhesion was measured by running 100 samples of each sample laminated on PET protective film (1) through the protective film processing line. The presence or absence of defects (adhesion N) was confirmed (Table 1).

sample Release silicone
Solution (wt%) Adhesive silicone
Solution (wt%) crosslinking agent
(wt%) catalyst
(wt%) Dysplasia
(Y/N) Adhesion
(Y/N) final #One 73.5 25.0 0.2 1.3 N Y N #2 76.0 22.5 0.2 1.3 N Y N #3 78.5 20.0 0.2 1.3 N Y N #4 81.0 17.5 0.2 1.3 N Y N #5 83.5 15.0 0.2 1.3 N Y N #6 86.0 12.5 0.2 1.3 N Y N #7 88.5 10.0 0.2 1.3 N Y N #8 91.0 7.5 0.2 1.3 N Y N #9 93.5 5.0 0.2 1.3 N Y N #10 96.0 2.5 0.2 1.3 Y Y Y #11 98.5 0 0.2 1.3 Y N N

In Table 1, the sample that satisfies both release and adhesion by attaching to acrylic adhesive and PET film is #10.

[Example 2]

To confirm the precise boundary values between samples #9~#10 and #10~#11, 3.0~4.5% by weight of the adhesive silicone solution were added at 0.5% by weight intervals among 94.0~95.5% by weight of the release silicone solution and 96.5~98.0% by weight. %, 0.5 to 2.0 wt% were selected at intervals of 0.5 wt%, and crosslinker was used at 0.2 wt% and catalyst was 1.3 wt%, and release properties and adhesion were confirmed (Table 2).

sample Release silicone
Solution (wt%) Adhesive silicone
Solution (wt%) Dysplasia
(Y/N) Release force
(gf/inch) Adhesion
(Y/N) Adhesion
(gf/5inch) final
(Y/N) #12 94.0 4.5 Y 30 Y 4.5 Y #13 94.5 4.0 Y 28 Y 4.2 Y #14 95.0 3.5 Y 26 Y 3.9 Y #15 95.5 3.0 Y 24 Y 3.6 Y #16 96.5 2.0 Y 22 Y 3.3 Y #17 97.0 1.5 Y 20 Y 3.0 Y #18 97.5 1.0 Y 18 N 2.8 N #19 98.0 0.5 Y 16 N 2.5 N

In Table 2, samples that satisfy both release and adhesion properties by attaching to acrylic adhesive and PET film are #12 to #17.

[Example 3]

To check the boundary range more precisely, at 0.1% by weight intervals among the release silicone solution of 93.6 to 93.9% by weight and 97.1 to 97.4% by weight, and at 0.1% by weight among the adhesive silicone solution of 4.6 to 4.9% by weight and 1.1 to 1.4% by weight. Release property and adhesion were confirmed by using 0.2% by weight of crosslinker and 1.2% by weight of catalyst (Table 3).

sample Release silicone
Solution (wt%) Adhesive silicone
Solution (wt%) Dysplasia
(Y/N) Release force
(gf/inch) Adhesion
(Y/N) Adhesion
(gf/5inch) final
(Y/N) #21 93.6 4.9 N 32 Y 4.7 N #22 93.7 4.8 N 32 Y 4.7 N #23 93.8 4.7 N 31 Y 4.6 N #24 93.9 4.6 N 31 Y 4.6 N #25 97.1 1.4 Y 19 N 2.9 N #26 97.2 1.3 Y 19 N 2.9 N #27 97.3 1.2 Y 18 N 2.8 N #28 97.4 1.1 Y 18 N 2.7 N

In Table 3, there are no samples that satisfy both release and adhesion properties by attaching to acrylic adhesive and PET film. Therefore, samples #12 to #17 in Table 2 are samples that adhere to acrylic adhesive and PET film and satisfy both release and adhesion properties.

As a result, in order to satisfy both release and adhesion properties by attaching to acrylic adhesive and PET film, 94.0 to 97.0% by weight of release silicone solution, 1.5 to 4.5% by weight of adhesive silicone solution, 0.2% by weight of crosslinker, and platinum. It is preferable to form the adhesive release layer 22 with a mixed silicone solution mixed with 1.3% by weight of a chelade catalyst.

At this time, the adhesive release layer 22 has a release force of 20-30 gf for an acrylic adhesive and an adhesion force of 3-4.5 gf/5 inch for a PET protective film.

In the above-described examples, the crosslinking agent and catalyst contents were fixed at 0.2% by weight and 1.3% by weight, respectively. In an additional experiment, the content of the crosslinking agent and catalyst were slightly changed, the content of the adhesive silicone solution was fixed, and the content of the release silicone solution was adjusted or decreased according to the change in the crosslinking agent and catalyst content for the adhesive release layer 22 made of a mixed silicone solution. Release properties and adhesion were confirmed by attaching to adhesive and PET film.

As a result, even if the content of the crosslinker (crosslinker) in the mixed silicone solution is changed in the range of 0.1 to 0.2% by weight and the content of the platinum chelade catalyst in the range of 0.9 to 1.4% by weight, the adhesive release layer 22 has no release effect for the acrylic adhesive. Both performance and adhesion to PET film were satisfied.

According to an embodiment of the present invention, 94.0 to 97.0% by weight of release silicone solution, 1.5 to 4.5% by weight of adhesive silicone solution, 0.2% by weight of crosslinker, and 1.3% by weight of platinum chelade catalyst were mixed in a mixed silicone solution. When the adhesive silicone layer 22 is formed, the adhesive silicone layer 22 contains 94.0 to 97.0% by weight of polydimethylsiloxane in the release silicone solution, 28.2 to 29.1% by weight of polydimethylsiloxane in the adhesive silicone solution, and 1.5 to 4.5% by weight of the adhesive silicone solution. It contains 0.45 to 1.35% by weight of silver, 1.5 to 4.5% by weight of the adhesive silicone solution, and 0.45 to 1.35% by weight of trimethylated silica. As a result, the adhesive silicone layer 22 contains polydimethylsiloxane and trimethylated silica in a ratio of 28.65 to 30.45: 0.45 to 1.35.

In the above, preferred embodiments of the present invention have been shown and described, but the present invention is not limited to the specific embodiments described above, and may be used in the technical field to which the invention pertains without departing from the gist of the present invention as claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be understood individually from the technical idea or perspective of the present invention.

1: Protective film
2: Release paper
21: Base member
22: Adhesive release layer

Claims (7)

In the method of manufacturing release paper for manufacturing a protective film,
Preparing a release silicone solution containing a first base polymer mainly containing polydimethylsiloxane and a solvent;
Preparing an adhesive silicone solution containing a second base polymer mainly composed of trimethylated silica and polydimethylsiloxane and a solvent;
Preparing a hybrid silicone solution by mixing 94.0 to 97.0% by weight of the release silicone solution, 1.5 to 4.5% by weight of the adhesive silicone solution, 0.1 to 0.3% by weight of a crosslinker, and 0.9 to 1.4% by weight of a catalyst;
Coating the hybrid silicon solution on a base member; and
A method of producing release paper comprising the step of heating a base member coated with the hybrid silicone solution. According to paragraph 1,
The release silicone solution contains 30% by weight of polydimethylsiloxane and 70% by weight of solvent,
The adhesive silicone solution is a method of producing a release paper containing 30% by weight of polydimethylsiloxane, 30% by weight of trimethylated silica, and 40% by weight of a solvent. In number 1,
The protective film includes an acrylic adhesive provided on one side,
The adhesive release layer has a release force of 20-30gf/inch with respect to the acrylic adhesive and a release paper with an adhesion force of 3-4.5gf/5inch with respect to the protective film. In the release paper for manufacturing protective films,
base member; and
It includes an adhesive release layer applied to one surface of the base member,
The adhesive release layer is,
94.0 to 97.0% by weight of a release silicone solution containing a first base polymer mainly containing polydimethylsiloxane and a solvent;
1.5 to 4.5% by weight of an adhesive silicone solution containing a second base polymer mainly composed of trimethylated silica and polydimethylsiloxane and a solvent;
0.1 to 0.3% by weight of cross-linking agent; and
Catalyst 0.9~1.4% by weight;
Release paper, characterized in that it is formed by applying a mixed silicone solution. According to paragraph 4,
The release silicone solution contains 30% by weight of polydimethylsiloxane and 70% by weight of solvent,
The adhesive silicone solution is a release paper containing 30% by weight of polydimethylsiloxane, 30% by weight of trimethylated silica, and 40% by weight of solvent. According to paragraph 4,
The adhesive release layer is a release paper containing polydimethylsiloxane and trimethylated silica in a ratio of 28.65 to 30.45: 0.45 to 1.35. According to paragraph 4,
The protective film includes an acrylic adhesive provided on one side,
The adhesive release layer has a release force of 20-30gf to the acrylic adhesive and a release paper having an adhesion force of 3-4.5gf/5inch to the protective film.

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