KR100808208B1 - Lusterless uv curing composition for writing board and lusterless film for writing board coated the composition - Google Patents

Abstract

A lusterless UV curing composition for a writing board is provided to produce lusterless films having excellent solvent resistance, scratch resistance, erasability, writability, and adhesion. A lusterless UV curing composition for a writing board comprises 3-30 parts by weight of a flatting agent, 40-70 parts by weight of a UV-curable hexafunctional oligomer, 3-20 parts by weight of a UV-curable monofunctional to trifunctional oligomer, 10-20 parts by weight of a UV-curable monomer, 0.2-1.5 parts by weight of a UV-curable surface controller, and 3-10 parts by weight of a hardener. A lusterless film for a writing board is obtained by coating the upside of a polyethylene terephthalate film substrate with the lusterless UV curing composition in a thickness of 3-40 micron to form a lusterless layer.

Description

Lusterless UV curing composition for writing board and lusterless film for writing board coated the composition}

1-A cross-sectional view of (a) a matte film for the writing board and (b) a writing board from which the release paper is removed according to an embodiment of the present invention.

Figure 2-a perspective view of a release paper formed with embossed pattern according to an embodiment of the present invention.

10: adhesion object 100: polyethylene terephthalate film

200: coating layer 300: adhesive layer

400: release paper 410: embossed pattern

The present invention relates to a matte UV-curable composition for writing boards and a matte film for writing boards, the matte UV-curable composition and writing for writing boards excellent in writing, adhesiveness, solvent resistance and scratch resistance, It relates to a matte film for boards.

Writing boards are generally used for whiteboards with white color. The whiteboard is a whiteboard with a glossy surface and without scratches. It can be painted, written and erased with a water-based pen made of dye ink. It is a product made to be. Such a white board does not generate fine chalk powder generated from chalk instead of a blackboard using conventional chalk, and is widely used in schools, academies, and businesses because of its ease of use.

However, the conventional whiteboard has the advantage of good writing ability and less environmental pollution when writing or drawing with a water-based pen, while the whiteboard is less visible due to fluorescent light or light reflection and reflects light or light. There is a disadvantage that the letters and pictures of the parts are not easily seen.

In particular, when the instructor writes a water-based pen on the surface of the whiteboard under the fluorescent lamp at night, the fluorescent light is reflected on the surface of the whiteboard or the fluorescent lamp itself is visible on the whiteboard surface. Due to this shape, the trainees are not able to quickly understand the contents of the lecture and have difficulty in not recording the contents of the lecture in the notebook, which is disadvantageous, and when exposed to the reflected light for a long time, the eyesight is weakened. As the need and awareness of matte whiteboards on the surface increases, domestic companies are also accelerating the development of matte whiteboards and introducing several products.

Compared to these products, pure domestic products are still matte and still have visibility problems. Some products are made of a combination of matte-treated thermoplastic fluorocarbon resin and PET. As it is impossible to record and can be used in the oil pen, it is not a whiteboard in the strict sense.

The present invention has been made to solve the above problems, the object of the present invention is to provide a UV-curable composition that generates a matte, by using this matte excellent writing and adhesiveness, solvent resistance and scratch resistance It is an object of the present invention to provide a matte film for writing board having excellent properties.

In addition, it is easy to attach / detach with the adhesive object because of its excellent adhesiveness, and it is possible to provide a variety of colors by adding color pigments, and to provide a matte film for writing boards that prevents bubbles from forming by using embossed release paper. The purpose.

In order to achieve the above object, the present invention, 3 to 30 parts by weight of a matting agent, 40 to 70 parts by weight of UV curing type 6 functional oligomer, 3 to 20 parts by weight of UV curing type 1 to 3 functional group oligomer, 10 to 20 parts by weight of UV A curable monomer, 0.2 to 1.5 parts by weight of a UV curable surface control agent, 3 to 10 parts by weight of a matting UV curable composition for writing board and the matte UV curable composition comprising a 3 to 40 parts by weight on the polyethylene terephthalate film upper surface The matte film for writing boards coated with a thickness of μm is a technical subject matter.

In addition, the quencher is preferably used by selecting at least one of an inorganic quencher, an organic quencher, a wax quencher, the oligomer is an aliphatic acrylate oligomer, the tri-functional oligomer is 9 ~ to the six-functional oligomer It is preferably added in an 11 weight ratio.

Here, the lower surface of the polyethylene terephthalate film is preferably a pressure-sensitive adhesive layer is formed by coating a pressure-sensitive adhesive composition of a mixture of white titanium oxide and an acrylic pressure-sensitive adhesive, and furthermore, a color pigment is further added to the acrylic pressure-sensitive adhesive to form a writing color board. It is preferable to make it.

In addition, it is preferable that a release paper for protecting the adhesive layer is attached to the lower surface of the adhesive layer, and an embossing pattern for preventing bubbles is further formed on the upper surface of the release paper.

Accordingly, the surface of the matting film for writing boards coated with the UV-curable composition has extremely low light reflection by fluorescent lamps, so that there is no glare, and writing and solvent resistance and scratch resistance are excellent. The backing of the matte film for writing board is excellent and it is easy to use because it forms a re-peelable adhesive layer with various colored pigments to relieve eye fatigue and can be easily attached and removed. In addition, by attaching an embossed patterned release paper to protect the adhesive layer of the matting film for writing board, by suppressing the generation of bubbles generated between the matting film for writing board and the adhesive object, the surface is smooth and excellent quality There is an advantage to provide a writing board.

Hereinafter, with reference to the accompanying drawings for the present invention will be described in detail. Figure 1 (a) is a matting film for writing board according to an embodiment of the present invention, Figure 1 (b) is a cross-sectional view of the writing board is removed from the release paper according to an embodiment of the present invention, Figure 2 It shows a perspective view of a release paper formed embossed pattern according to the embodiment.

The present invention relates to a matte UV-curable composition for writing board and a film for writing board coated with the same, wherein the matte UV-curable composition is added to 3 to 30 parts by weight of a total weight as a matting agent for quenching light, 40 to 70 parts by weight UV curable 6 functional group oligomer, 3 to 20 parts by weight of UV curable 1 to 3 functional group oligomer, 10 to 20 parts by weight of UV curable monomer, 0.2 to 1.5 parts by weight of UV curable surface control agent, 3 to 10 parts by weight of the curing agent.

In addition, the matte UV-curable composition is coated on the upper surface of the polyethylene terephthalate (PET) film 100 with a thickness of 3 to 40㎛ to prepare a matte film for writing board.

A pressure-sensitive adhesive is coated on the bottom surface of the matting film for writing board, and the pressure-sensitive adhesive composition of the pressure-sensitive adhesive composition is made of white titanium oxide and an acrylic pressure-sensitive adhesive, and is coated on the bottom surface of the matting film for writing board to form an adhesive layer 300. In order to protect the adhesive layer 300, the release paper 400 is provided to be separately attached.

By peeling the release paper 400, the matting film for writing board is adhered to the upper surface of the adhesive object 10, thereby completing the matt writing board.

Here, the color of the writing board may form a board of various colors such as white, green, and blue according to the addition of a pigment having a separate color to the adhesive.

In the present invention, as a quencher, an inorganic quencher, an organic quencher, a wax quencher, etc. may be used, and as an inorganic quencher, SiO ₂ , Talc, CaCO ₃ , MgO, Al ₂ O ₃ , ZnO, CaO, Zeolite, etc. There are, as the organic quencher PMMA powder, melamine powder (Melamaine powder), the wax quencher is PE, PP, Amide, fluorine.

If you use silica as an inorganic quencher, you should use silica coated with organic material. If the organic material is not coated on silica surface or the silica content is large, stains remain on the surface when you erase letters or pictures with water-based pen. Crazy In addition, Talc or CaCO ₃ does not adversely affect erase properties, but requires a large amount of matte to exhibit a matte effect, and has a disadvantage in that wear resistance of the writing board surface is inferior as the amount is high. In addition, when the wax quencher is used alone, the quenching property is decreased, and when used in combination with an inorganic or organic quencher, the surface slipperiness and solvent resistance are improved, but when a large amount is used, the coating is difficult due to an increase in the thixotropy. It is preferable to select and use the quencher in an optimum ratio or to mix according to the type.

In addition, the UV-curable oligomer is used as a binder of the UV-curable composition, excluding aromatic urethane acrylate or bisphenol-type epoxy acrylate that causes yellowing due to the characteristics of the writing board that is exposed to the outside for a long time, pure aliphatic urethane of 6 or more functional groups An oligomer of at least one functional group and at least trifunctional group was used for acrylate oligomer and viscosity control and adhesion improvement.

If only oligomers of 6 or more functional groups are used as binders, the eraser on the surface of the matte writing board increases, but it cannot be commercialized due to the curl of the polyethylene terephthalate (PET), which is a substrate. When the physical properties of the pen (curl) is eliminated due to the flexible physical properties and the flatness was also excellent, but the eraser was significantly reduced when the surface of the writing board with the water-based pen eraser. In addition, when the acrylate oligomer having an ether structure is used, the surface dryness is much better but also the performance is significantly lower in the eraseability of the ink.

Therefore, in the present invention, it is preferable that 1-3 functional group oligomers are used in a 9 to 11 weight ratio of the 6 functional group oligomer and the 1 to 3 functional group oligomer, more preferably in the 6 functional group oligomer. When the 10 weight ratio was replaced with 1-3 functional group oligomers, curling was also significantly reduced and ink eraseability was excellent.

In addition, as the content of the organic and inorganic matting agents used to manufacture the matte whiteboard increases, the viscosity is increased, and this increased viscosity causes difficulty in coating. Therefore, as a method for maintaining a moderate viscosity Monomers larger than monofunctional and smaller than 6 functional groups are used. If the content of the monomer is increased, the leveling of the surface is improved during coating, but ink eraseability is decreased and UV drying speed is decreased. Therefore, use an appropriate amount.

In the case of the UV-curable surface control agent, polydimethyl siloxane or silicone polyether acrylate form was mainly used, and a small amount of silicone acrylate was added thereto to improve surface bubbles and wear resistance. In the case of the surface control agent, the amount of the additive is high, so that the wetting power of the aqueous pen is deteriorated due to the influence of silicone, and when the amount of the additive is small, the eraser becomes poor and stains remain on the surface of the whiteboard. In addition, the use of non-UV curing silicone surface control agent is excellent in erasing of the text, but after erasing the text with an aqueous pen eraser, the writing trace appears on the surface of the writing board. You will not be able to expect continuity. Therefore, it is preferable to use a UV curing surface control agent.

And as a hardening | curing agent, the photoinitiator which absorbs an ultraviolet-ray and produces | generates a free radical is used. The free radicals initiate the reaction and the lower the content of the photoinitiator, the better the adhesion, but the lower the dryness of the surface, the lower the ink eraseability, and the higher the content, the faster the surface dryability, the better the eraseability, but the polyethylene terephthalate (PET) film (100) Adhesion with a base material falls.

The present invention relates to a UV curable composition made by adding a UV curing silicone surface control agent, including a matting agent. The composition is made by adding oligomers of 1 to 3 functional groups to oligomers of 6 or more functional groups, the quencher used does not affect the eraseability of the aqueous pen, and the silicone surface modifier with the polyethylene terephthalate (PET) film 100 substrate. 0.2 to 1.5% of the range that does not affect the adhesion and handwriting was used.

The coating method of applying the UV curable composition according to the present invention on a polyethylene terephthalate (PET) film 100 based on gravure, micro gravure, comma, air nife ) And a roll coating method, and the coating method may be arbitrarily selected according to the thickness of the coating layer 200 or the viscosity state of the composition.

The thickness of the coating layer 200 is suitable 3 ~ 40㎛, more preferably 5 ~ 30㎛. Below 3 μm, it is difficult to produce a sufficient matte, and at 40 μm or more, a decrease in adhesion and curl may occur due to the thickness of the coating layer 200.

The lower surface of the polyethylene terephthalate (PET) film 100 is treated with an acrylic copolymer adhesive capable of re-removal to form an adhesive layer 300 so that it can be easily attached and detached, and the thickness of the adhesive layer 300 20-25 micrometers is suitable. A release paper 400 is attached to protect the adhesive layer 300, and an emboss pattern 410 is formed on the upper surface of the release paper 400. Here, the embossed pattern 410 is formed of a PE material, by laminating the roll formed on the embossed pattern 410 on the release paper 400 so that the embossed pattern (410) is formed on the upper surface of the release paper 400.

Figure 2 shows an embodiment for the hexagonal embossed pattern 410 formed on the upper surface of the release paper 400, the embossed pattern 410 is a film when the adhesive is attached to the release paper 400 with the polyethylene terephthalate film 100 It is partially projected on the lower surface to suppress the generation of bubbles generated between the adhesive object 10 when the polyethylene terephthalate film 100 is adhered to the adhesive object 10 to produce a writing board having a smooth surface and excellent quality. I would have to.

Hereinafter, preferred examples of the present invention and comparative examples thereof are shown, and physical properties of the examples and the comparative examples were measured. The UV-curable composition having the following composition was applied to the upper surface of the polyethylene terephthalate film 100 having a thickness of 170 μm using an applicator, dried at 80 ° C. for 1 minute, and then subjected to UV curing in an ultraviolet irradiation device, and the thickness of the coating layer 200. Was maintained at 25 μm. The writing board was manufactured using the UV-curable composition prepared according to the embodiment, and the physical properties thereof are shown in Table 1. Here, we made a white board. And a dispersant was further added in order to improve the dispersibility between each composition.

< Example  1>

CaCO ₃ (Inorganic quencher) 10% by weight

5% by weight of CERAFLOUR 995 (wax quencher)

6 functional group oligomer SU522 61% by weight

Trifunctional oligomer SU5260 6% by weight

10% by weight of 1,6-hexanediol diacrylate (monomer)

RAD 2250 (surface slipper) 1% by weight

Chivacure 184 (hardener) 6% by weight

BYK 168 (dispersant) 1% by weight

< Example  2>

5 wt% of WN 1135 (wax quencher)

PMMA powder 5% by weight

64% by weight of 6 functional group oligomer SU571

Trifunctional oligomer SU594 6% by weight

13% by weight of 2-hydroxypropyl acrylate (monomer)

UV 3500 (surface slipper) 1% by weight

5% by weight of Chivacure 184 (hardener)

BYK 168 (dispersant) 1% by weight

< Example  3>

CAB-O-SIL TS-610 (Inorganic quencher) 5% by weight

5 wt% of WN 1135 (organic quencher)

6 functional group oligomer SU522B 60% by weight

Trifunctional oligomer SU564 7% by weight

16% by weight of isobornyl acrylate (monomer)

UV 3500 (Surface Slipper) 0.5% by weight

UV 3510 (Surface Slipper) 0.5% by weight

5% by weight of Chivacure 184 (hardener)

BYK 168 (dispersant) 1% by weight

< Example  4>

Dusil WM 1200 (Inorganic quencher) 5% by weight

5 wt% of WN 1000 (wax quencher)

6 functional group oligomer SU522 62% by weight

Trifunctional oligomer SU564 6% by weight

15% by weight of trimethylol propane triacrylate (monomer)

1 weight% of RAD 2500 (surface slip agent)

5% by weight of Chivacure 184 (hardener)

BYK 168 (dispersant) 1% by weight

Comparative Example 1

CaCO3 (inorganic quencher) 10% by weight

5 wt% of WN 1135 (wax quencher)

9 functional group oligomer SU5039 63% by weight

15% by weight of 1,6-hexanediol diacrylate (monomer)

1 weight% of RAD 2500 (surface slip agent)

5% by weight of Chivacure 184 (hardener)

BYK 168 (dispersant) 1% by weight

Comparative Example 2

E 220A (Inorganic quencher) 5% by weight

70 wt% of 6 functional group oligomer SU522

Trifunctional oligomer SU5260 7% by weight

10% by weight of 1,6-hexanediol diacrylate (monomer)

1 weight% of RAD 2500 (surface slip agent)

Chivacure 184 (hardener) 6% by weight

BYK 168 (dispersant) 1% by weight

Comparative Example 3

CaCO ₃ (Inorganic quencher) 10% by weight

5 wt% of WN 1000 (wax quencher)

6 functional group oligomer SU522 60% by weight

Trifunctional oligomer SU564 7% by weight

10% by weight of trimethylol propane acrylate (monomer)

2% by weight of RAD 2500 (surface slip agent)

5% by weight of Chivacure 184 (hardener)

BYK 168 (dispersant) 1% by weight

Evaluation of physical properties of the film produced in the following Examples was carried out by the following method.

1) Hardness meter

Surface hardness was measured using a pencil hardness meter (Mitsubishi pencil, 750g).

2) solvent resistance

After immersion in isopropyl alcohol, toluene, acetone for 24 hours, the physical properties of the coating film were observed.

3) Handwriting

After writing with a water-based pen, left for 1 hour, the state of the writing was observed.

4) Erase

After 7 days of writing with a water-based pen, it was judged whether it was erased with a water-based pen eraser after 7 days.

5) Surface condition

The curl of the whiteboard surface state was observed.

6) adhesion

After attaching the cellophane tape to the surface of the whiteboard, when the surface was peeled off, the surface was checked and judged as good or poor for the coating layer.

7) Matte

60 ° glossiness of the surface was measured using a Sheen glossmeter.

TABLE 1

 1) hardness  2) solvent resistance  3) Handwriting  4) Erase  5) Surface condition  6) adhesion  7) Matte  Example 1  2H  Good  Good  Good  Good  Good  28-30  Example 2  2H  Good  Good  Good  Good  Good  15-17  Example 3  2H  Good  Good  Good  Good  Good  25-27  Example 4  2H  Good  Good  Good  Good  Good  20-22  Comparative Example 1  3H  Good  Good  Good  Bad  Good  32-34  Comparative Example 2  H  Good  Good  Bad  Good  Good  17-19  Comparative Example 3  2H  Good  Bad  Good  Good  Bad  42-44

As shown in Table 1, when only oligomers having 6 or more functional groups were used as the binders as in Comparative Example 1, the eraseability of the surface of the whiteboard was increased while the curl phenomenon of the polyethylene terephthalate (PET) film as a substrate was increased. Due to the flexible properties, curling is eliminated and flatness is excellent, but the eraseability is remarkably clear when the surface of the writing board is erased with an aqueous pen eraser. The falling result came out.

In addition, when a large amount of the UV-curable silicone surface control agent was added, as in Comparative Example 3, it was confirmed that the adhesion of the polyethylene terephthalate (PET) substrate and the coating layer 200 was inferior, and the handwriting was also inferior.

Therefore, in order to implement the present invention preferably, an oil, an inorganic, and a wax quencher are mixed and used in an appropriate amount, and an amount of an oligomer of 1 to 3 functional groups is suitably used with respect to the oligomer of 6 functional groups. In order not to affect the eraseability of the water-based pen, the UV-curable silicone surface modifier should be used in a range that does not affect the adhesion and handwriting with the polyethylene terephthalate (PET) film substrate.

According to the present invention, the UV curable composition is coated on a polyethylene terephthalate film and then irradiated with UV to produce a matting film for writing board, and the surface of the matting film for writing board is light reflective by fluorescent lamps. It has very little glare and is excellent in writing, solvent resistance, scratch resistance, and erasing effect when erasing letters and pictures with a water-based pen eraser.

In addition, the back surface of the matte film for writing board to form a re-peelable adhesive layer is added to a variety of pigments, relieve eye fatigue, can be easily attached and detached has the effect of enhancing the ease of use.

In addition, the adhesive layer on the bottom of the adhesive film for writing board protects the adhesive layer and attaches a release paper having an embossed pattern on the upper surface, and is generated between the writing board matting film and the adhesive object when the writing board is adhered to the adhesive object. By suppressing the occurrence of bubbles, the surface is smooth and has the effect of providing a writing board of excellent quality.

Claims (12)

3 to 30 parts by weight of matting agent, 40 to 70 parts by weight of UV curing type 6 functional oligomer, 3 to 20 parts by weight of UV curing type 1 to 3 functional group oligomer, 10 to 20 parts by weight of UV curing type monomer, 0.2 to 1.5 parts by weight of UV curing type surface control agent , 3 to 10 parts by weight of a curing agent matte UV curable composition for a writing board characterized in that it comprises. The method of claim 1, wherein the quencher, Matte UV curable composition for writing board, characterized in that at least one selected from inorganic matting agent, organic matting agent, wax quencher. The matte UV-curable composition for writing board according to claim 1, wherein the oligomer is an aliphatic acrylate oligomer, and the trifunctional oligomer is added in a 9 to 11 weight ratio based on the six functional oligomer. The matting UV curable composition for writing board according to claim 1, wherein the UV curable surface modifier is polydimethyl siloxane or silicone polyether acrylate. 3 to 30 parts by weight of matting agent, 40 to 70 parts by weight of UV curable 6 functional oligomer, 3 to 20 parts by weight of trifunctional oligomer, 10 to 20 parts by weight of monomer, 0.2 to 1.5 parts by weight of UV curable surface conditioner, 3 to 10 parts by weight The matte UV curable composition comprising a curing agent is coated on the upper surface of the polyethylene terephthalate (PET) film substrate 3 to 40㎛ thickness matte film for writing board, characterized in that the matte layer is formed. The method of claim 5, wherein the quencher, A matting film for writing boards, characterized in that at least one of an inorganic quencher, an organic quencher, a wax quencher is used. The matte film for writing board according to claim 5, wherein the oligomer is an aliphatic acrylate oligomer, and the trifunctional oligomer is added in a 9 to 11 weight ratio based on the six functional oligomer. The matting film for writing board according to claim 5, wherein the UV-curable surface modifier is polydimethyl siloxane or silicone polyether acrylate. The matte film for writing boards according to claim 5, wherein the polyethylene terephthalate (PET) film is coated with a pressure-sensitive adhesive composition mixed with a white titanium oxide and an acrylic pressure-sensitive adhesive to form an adhesive layer. 10. The matte film of claim 9, wherein a color pigment is further added to the acrylic adhesive. 10. The matte film of claim 9, wherein a release paper for protecting the adhesive layer is attached to the lower surface of the adhesive layer. 12. The matte film of claim 11, wherein an embossed pattern for preventing bubbles is further formed on the upper surface of the release paper.

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