KR102447220B1 - Interior panel with yellowing resistance - Google Patents

Abstract

Disclosed is an interior panel having yellowing resistance used to finish surfaces of an interior wall of a building, main room furniture such as a built-in cabinet, kitchen furniture such as a sink, and living room furniture such as a decorative cabinet. According to the present invention, provided is the interior panel which comprises: a base plate; a surface protective material attached to an upper surface of the base plate to impart waterproofness; a UV bonding portion formed by being applied to an upper surface of the surface protective material and composed of an adhesive containing urethane acrylate, isobornyl acrylate, benzyl acrylate, tetrahydrofurfuryl acrylate, and 2-hydroxy-2-methyl-1-phenyl-1-propanone; and a transparent film portion attached to an upper surface of the UV bonding portion. The interior panel according to the present invention can stably maintain aesthetics of a product itself by inhibiting occurrence of yellowing even after a period of use elapses.

Description

Interior panel with yellowing resistance {INTERIOR PANEL WITH YELLOWING RESISTANCE}

The present invention relates to an interior panel having yellowing resistance for finishing the surfaces of built-in cabinets, sinks, interior walls of buildings, etc. , It relates to an interior panel having yellowing resistance used to finish the surface of living room furniture, such as decorative cabinets.

In general, various building materials such as interior materials and exterior materials are used for buildings such as houses and buildings. Panel type materials are mostly used for interior finishing materials such as ceiling materials or flooring materials and various furniture items such as doors and built-in furniture, including interior materials.

Currently, most of the panel-type materials are mainly wood-based panels. Solid wood, Medium Density Fiberboard (MDF), Particle Board (PB), melamine board, plywood, and reinforced wood are used. for example.

In addition, the wood-based panel such as MDF or PB is inexpensive and can be mass-produced, so it is widely adopted and used.

Recently, low-pressure melamine-impregnated paper (LPM) is attached to the surface of wood-based panels to improve aesthetics and waterproofness, and is used as an interior panel.

More specifically, for interior panels, LPM is attached to the surface of flat MDF or PB in order to impart decorative properties, UV adhesive is applied to the LPM and dried, and hardness for protecting the panel and securing scratch resistance to the UV adhesive I attached a film that can secure aesthetics as an interior panel.

However, these interior panels are vulnerable to yellowing, and there is a problem that the color change increases as the use time increases.

Republic of Korea Patent Registration No. 10-2258136 (Announcement on May 31, 2021) Republic of Korea Patent Registration No. 10-1794587 (2017.11.07 Announcement) Republic of Korea Patent Registration No. 10-2043544 (Notice on 11/11/2019) Republic of Korea Patent Registration No. 10-1354526 (Announcement on Jan. 22, 2014)

Accordingly, an object of the present invention is to provide an interior panel having yellowing resistance in which yellowing is inhibited even when a transparent film is attached to the surface of a base plate provided with a surface protection material.

In order to achieve the above object of the present invention, in one embodiment of the present invention, a base plate, a surface protective material attached to the upper surface of the base plate to give waterproofness, and a UV adhesive formed by coating on the upper surface of the surface protective material, and a transparent film part attached to the upper surface of the UV adhesive part, wherein the UV adhesive part is urethane acrylate, isobornyl acrylate, benzyl acrylate, tetrahydrofurfuryl acrylate, 2-hydroxy-2 It provides an interior panel having yellowing resistance, characterized in that it is composed of an adhesive containing -methyl-1-phenyl-1-propanone.

The interior panel according to the present invention can suppress the occurrence of yellowing even when the period of use has elapsed, thereby stably maintaining the aesthetics of the product itself.

In addition, the present invention can impart yellowing resistance to the interior panel by controlling the composition of the UV adhesive and the amount of UV light for curing the UV adhesive.

1 is a cross-sectional view for explaining an interior panel according to the present invention.

Hereinafter, an interior panel (hereinafter, abbreviated as 'interior panel') having yellowing resistance according to preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view for explaining an interior panel according to the present invention.

Referring to FIG. 1 , the interior panel according to the present invention includes a base plate 10 , a surface protection material 20 attached to the upper surface of the base plate 10 , and an upper surface of the surface protection material 20 . It includes a UV adhesive part 30, and a transparent film part 40 attached to the upper surface of the UV adhesive part 30, and optionally a second surface protection material 50 attached to the lower surface of the base plate 10 further. may include Hereinafter, the surface protection material 20 is referred to as a first surface protection material 20 to distinguish it from the second surface protection material 50 .

Hereinafter, each component will be described in more detail with reference to the drawings.

The interior panel according to the present invention includes a base plate (10).

The base plate 10 is to provide the basic skeleton of the interior panel, medium-density fiberboard (MDF), particle board (Particle Board: PB), high-density fiberboard (High Density Fiberoard: HDF) forming a plate shape ) is preferably made of any one synthetic wood gluing material selected from plywood or wood gluing board, such as.

If necessary, the base plate 10 may be configured by adding a flame retardant. As the flame retardant, any one of boron-based, phosphorus-based, bromine-based, phosphorus-based and halogen-based, halogen and bromine-based, chlorine-based, aluminum hydroxide and magnesium hydroxide flame retardants or a mixture thereof may be used.

Specifically, as the flame retardant according to the present invention, it is preferable to use a phosphonate complex (a mixture of complex phosphonates) in order to exhibit excellent flame retardant properties compared to the amount added.

In addition, the base plate 10 is not particularly limited because its thickness can be changed according to the use of the interior panel, but is preferably formed to a thickness of 6 mm to 20 mm.

The interior panel according to the present invention may include a first surface protection material 20 and optionally further include a second surface protection material 50 .

These surface protection materials 20 and 50 provide a function to protect the base plate 10 and improve the aesthetics and waterproofness of the interior panel, and include low pressure melamine laminate sheet (LPM), polypropylene ( Poly Propylene: PP), may be composed of any one selected from polyvinyl chloride (Poly Vinyl Chloride: PVC).

In addition, the surface protection materials 20 and 50 may be formed to have a thickness of 0.1 to 0.5 mm.

The LPM is a board configured to be able to adhere to the base plate 10 through heat and pressure without a separate adhesive after impregnating urea resin and melamine resin on sheet paper printed in various patterns, and adhesion with the base plate 10 is made. It is formed in a plate shape so that

The sheet paper is formed of a material such as paper or synthetic resin, and patterns such as patterns and patterns can be formed for use in indoor and outdoor interiors. The impregnation of the sheet paper with the melamine resin is to impart a certain incombustibility to the sheet paper and at the same time prevent damage to the pattern and facilitate binding to the base plate 10 .

This LPM has excellent surface strength, gloss, and smoothness, and for this purpose, it is composed of not only melamine resin but also urea resin.

More specifically, the LPM may be manufactured by first impregnating the sheet paper with urea resin, impregnating the sheet paper with melamine resin secondarily, and then drying the sheet paper for 30 to 120 seconds in an oven at 100 to 180° C. and then semi-curing it. .

Here, the LPM preferably includes 38 to 51% by weight of sheet paper, 27 to 40% by weight of melamine resin, and 17 to 24% by weight of urea resin. If necessary, the LPM may be configured to further include 5 to 16% by weight of a flame retardant.

The melamine resin is a thermosetting resin, and has excellent heat resistance, light resistance, solvent resistance, weather resistance, chemical resistance, abrasion resistance, and electrical properties. When such a melamine resin is formed as a coating film, it has high hardness and excellent gloss, is colorless and transparent, and has a certain level of flame retardancy. In addition, the melamine resin also serves to provide bonding strength with the sheet paper. To this end, the melamine resin is preferably composed of 35 to 50% by weight of melamine, 40 to 55% by weight of formalin, 7 to 15% by weight of water, and 0.05 to 0.5% by weight of an aqueous solution of sodium hydroxide having a concentration of 10% as a pH adjusting agent. .

The urea resin is a colorless and transparent thermosetting resin, and in the present invention as an embodiment 25 to 35% by weight of urea, 55 to 70% by weight of formalin, 4 to 10% by weight of water, and a 10% concentration of sodium hydroxide aqueous solution 0.2 as a pH adjuster To 1.0% by weight, it is preferable to use a pH control and resin stabilizer containing 0.2 to 1.0% by weight of an aqueous solution of TEA (TriEthanolAmine) at a concentration of 50%.

Both of these melamine resins and urea resins are collectively referred to as amino plastics. When melamine resin is used in an amount of less than 27% by weight, the bonding strength with sheet paper and physical properties to withstand heat, light, and chemicals are not sufficiently provided, and the glossiness is lowered, resulting in poor marketability. There are problems such as On the other hand, when the urea resin is used in an amount of less than 17% by weight, there is a problem in that the tensile strength is lowered and the torsion temperature due to heat is lowered.

At this time, it is preferable to sequentially impregnate the melamine resin and the urea resin so that the sheet is coated, and for convenience, the urea resin may be simultaneously impregnated with a mixture of the two resins.

Since the flame retardant contained in the LPM is the same as the flame retardant of the base plate 10, a more detailed description will be omitted. However, when the flame retardant is included in the base plate 10 , the LPM may not include the flame retardant, and both the base plate 10 and the LPM may be configured to include the flame retardant.

On the other hand, when the LPM is attached to both sides of the base plate 10 through heat and pressure, it is formed to have a thickness of 0.1 to 0.3 mm and is attached to both sides of the base plate 10 . As such, when the first surface protection material 20 composed of LPM is attached to the upper surface of the base plate 10 and the second surface protection material 50 composed of LPM is attached to the lower surface, the interior panel of the present invention has a higher strength can be obtained.

On the other hand, the PP and PVC are sheets configured to be attached to the base plate 10 , and provide stable aesthetics and waterproofness by protecting the base plate 10 and eliminating surface curvature of the base plate 10 . In addition, PP and PVC can give color to interior panels, and various patterns of shapes and designs can be printed to introduce new aesthetics to interior panels.

In addition, PP and PVC are formed to have a thickness of 0.3 to 0.5 mm and are attached to both sides of the base plate 10 .

The PP and PVC are provided with an adhesive on the surface in contact with the base plate 10 , and can be easily attached to the upper and lower surfaces of the base plate 10 using a lamination roll or the like.

The interior panel according to the present invention includes a UV bonding unit 30 .

The UV adhesive part 30 is formed by applying a UV adhesive to the upper surface of the first surface protection material 20 , and is cured by ultraviolet rays between the first surface protection material 20 and the transparent film part 40 to form a transparent film part It provides a function of attaching (40) to the first surface protection material (20).

The UV adhesive 30 may be configured to improve the problem of yellowing of the interior panel. To this end, the UV adhesive unit 30 reduces the content of the photoinitiator included in the UV adhesive and increases the amount of UV light for curing the UV adhesive.

Specifically, the UV bonding unit 30 is composed of a UV adhesive cured by exposure to ultraviolet rays of 2500-2700 mj/cm ² through a UV irradiation device, and the thickness thereof is formed in a range of 40 μm to 50 μm. At this time, if the amount of UV light for curing the UV adhesive is less than 2500 mj/cm ² , the deterrence against yellowing is relieved, and as the period of use elapses, a problem in that the interior panel is yellowed may occur. In addition, when the amount of UV light for curing the UV adhesive exceeds 2700 mj/cm ² , the deterrence against yellowing may slightly increase, but a problem in that the production cost is increased may occur.

In addition, the UV irradiation device preferably uses ultraviolet rays having a wavelength of 320 to 455 nm in order to suppress the occurrence of yellowing. In this case, the UV irradiation device may use UVA having a wavelength of 320 to 395 nm and UVV having a wavelength of 395 to 455 nm.

In addition, the UV bonding portion 30 is urethane acrylate, isobonyl acrylate (Isobonyl acrylate), tetrahydrofurfuryl acrylate (Tetrahydrofurfuryl acrylate; THFA), benzyl acrylate (Benzyl Acrylate: BZA), 2- It consists of a UV adhesive with hydroxy-2-methyl-1-phenyl-1-propanone (2-Hydroxy-2-methylpropiophenone).

The urethane acrylate, as an oligomer, improves the surface crosslinking density of the UV adhesive part and promotes internal drying properties during UV curing with the help of a photoinitiator, and 40 to 59% by weight based on 100% by weight of the UV adhesive can be added. have. In addition, urethane acrylate provides a function of improving the flexibility, flexibility, and hardness of the adhesive layer according to the flexible properties of the interior panel.

The isobornyl acrylate is a monomer used as a material for polymer synthesis, and may be added in an amount of 16 to 24% by weight based on 100% by weight of the UV adhesive.

The THFA acts as a monomer, and may be added in an amount of 7 to 11 wt% based on 100 wt% of the UV adhesive.

If such a monomer is used in an amount less than the above-mentioned addition amount, the viscosity of the adhesive as a whole may be increased, which may cause a problem that workability is remarkably deteriorated.

Since the BZA has an acrylate functional group, it can be cured in UV light and serves as a reactive diluent for adjusting the viscosity of the adhesive, and 14 to 20 wt% of the UV adhesive can be added based on 100 wt%.

The 2-hydroxy-2-methylpropiophenone serves as a photoinitiator, and 3 to 5 wt% may be added based on 100 wt% of the UV adhesive.

When the amount of 2-hydroxy-2-methylpropiophenone is added in less than 3% by weight, it may take an excessive amount of time until the curing reaction starts, or the curing reaction may not sufficiently occur, resulting in poor curability. And when 2-hydroxy-2-methylpropiophenone is added in excess of 5 wt%, it is difficult to expect the effect of accelerating the curing reaction, and there may be a problem in that the inhibitory power of yellowing is alleviated.

If necessary, when the surface protection material 20 is a white LPM, the UV adhesive may further include titanium dioxide (TiO ₂ ). This is to suppress the occurrence of yellowing by adding titanium dioxide as a white pigment to the UV adhesive since yellowing of the interior panel is more clearly revealed when white LPM is used as a surface protection material.

1 to 3% by weight of the titanium dioxide may be added based on 100% by weight of the UV adhesive. At this time, when titanium dioxide is added in an amount of less than 1% by weight, there may be a problem in that the anti-yellowing ability is reduced, and when titanium dioxide is added in excess of 3% by weight, a sufficient elapsed reaction does not occur, resulting in poor curability. can be

The interior panel according to the present invention includes a transparent film unit 40 .

The transparent film part 40 is attached to the upper surface of the UV adhesive part 30 and serves to finish the surface of the interior panel.

If necessary, the transparent film unit 40 may be colored in various colors or the shapes and designs of various patterns may be printed.

In addition, since it becomes difficult to meet the demands of consumers who pursue luxury in appearance when the surface glossiness of the interior panel is too high, the transparent film unit 40 forms an embossing pattern on the surface to satisfy the matte characteristics. While controlling, it is possible to significantly reduce the roughness of the surface.

In addition, the transparent film unit 40 is seated on the upper surface of the UV adhesive applied to the first surface protection material 20, and then passes between the conveyor moving at an average speed of 8 to 10 m/min and the pressure roller installed on the conveyor. While being closely adhered to the UV adhesive, it is attached to the UV adhesive part 30 while passing through the UV lamp section.

And the transparent film part 40 may be formed to a thickness of 100 to 200㎛.

As an embodiment, the transparent film unit 40 according to the present invention may be formed of a polyethyleneterephthalate (PET) film or a polypropylene (PP) film. In a specific embodiment, the transparent film unit 40 according to the present invention may be formed of an amorphous polyethylene terephthalate (hereinafter, abbreviated as 'A-PET') film.

As another embodiment, the transparent film unit 40 according to the present invention includes a first glycol-modified PET (hereinafter, abbreviated as 'first G-PET') film, and A provided on the first G-PET film -PET film, and a second glycol-modified polyethylene terephthalate (hereinafter, abbreviated as 'second G-PET') film provided on the A-PET film may be composed of a GAG PET film.

Such a GAG PET film can be manufactured in a single process without an adhesive in a molten state after simultaneously extruding G-PET and A-PET.

In the transparent film part 40, the first GPET film is formed of 10 to 15% of the total thickness, the A-PET film is formed of 70 to 80% of the total thickness, and the second G-PET film is formed of the entire thickness. It may be formed to 10 to 15% of the thickness. For example, when the transparent film part 40 is formed to a thickness of 200 μm, the first GPET film is formed to a thickness of 20 to 30 μm, and the A-PET film is formed to a thickness of 140 to 160 μm, and the The second G-PET film is formed to a thickness of 20 to 30 μm.

The G-PET is a co-conjugated amorphous resin by adding dimethylcyclohexanedimethinol (CHDM) as a comonomer to be suitable for transparent and thick PIPE, SHEET, or containers, which are difficult to manufacture with conventional PET resins.

In addition, G-PET has greater impact strength than acrylic and similar to polycarbonate, has light transmittance of 85% or more, has excellent processability for cutting and punching, has a low molding temperature, can be printed and disinfected, and is resistant to It has chemical properties and has better secondary processability than ABS (acrylonitrile-butadiene-styrene), PVC (polyvinyl chloride), A-PET, PMMA (polymethyl methacrylate), and PC (poly carbonate).

In addition, the impact strength of G-PET is similar to that of PC and is superior to that of acrylic.

And G-PET can be molded at a lower temperature than A-PET, and has better adhesion than A-PET.

The A-PET is made by making PET of conventional crystalline resin amorphous to have transparency, and exhibits superior performance than PVC resin in strength and heat resistance, and is used as a PET film in conventional interior panels.

In other words, the A-PET film provided on the upper part of the LPM in the existing interior panel causes a problem in that the adhesive part with the UV adhesive is whitened, but the GAG PET film of the present invention is a G-PET film with excellent safety and is a UV adhesive. Whitening does not occur because it is in contact with

In addition, the GAG PET film reduces the generation of static electricity compared to the A-PET film, and provides a cleaner cut line than the A-PET film because of its excellent processability for cutting and punching.

If necessary, the transparent film part 40 may be provided with a primer layer for strengthening the adhesive force on the lower surface facing the UV adhesive part 30 . The primer layer forms the surface facing the transparent film part 40 in a surface state having affinity with the UV adhesive constituting the UV adhesive part 30, so that the transparent film part 40 is the first surface protection material by the UV adhesive. (20) helps to attach smoothly.

These primer layers are acrylic, acrylic urethane, epoxy, polyurethane, polyisocyanate, polyester, acrylate, ethylene-vinyl acetate copolymer, polyamide, melamine, synthetic rubber, or polyvinyl alcohol-based resin. etc. can be used.

The thickness of the primer layer is preferably maintained at about 1 to 5 μm. When the thickness of the primer layer is less than 1 μm, a surface having affinity with the UV adhesive is not properly formed, and when it exceeds 5 μm, it may be difficult to maintain smoothness.

Hereinafter, it will be described in more detail through specific examples and experimental examples of the present invention. However, these examples and experimental examples are intended to help the understanding of the specific examples of the above-described invention, and the scope of rights should not be construed as being limited thereby.

urea resin

A urea resin was prepared by mixing 3 kg of urea, 6 kg of formalin, 0.9 kg of water, 50 g of a 10% aqueous sodium hydroxide solution, and 50 g of a 50% TEA aqueous solution.

melamine resin

The melamine resin was prepared by mixing 4 kg of melamine, 5 kg of formalin, 960 g of water, and 40 g of a 10% aqueous sodium hydroxide solution.

10 kg of the melamine resin and 2.3 kg of the above-described flame retardant were mixed to prepare a melamine resin with a flame retardant added thereto.

UV adhesive

Urethane acrylate 5 kg, isobornyl acrylate 2 kg, tetrahydrofurfuryl acrylate 0.9 kg, benzyl acrylate 1.7 kg, 2-hydroxy-2-methyl-1-phenyl-1-propanone 0.4 kg prepared.

surface protection material

1. After the paper was first impregnated with the above-mentioned urea resin, it was dried by passing it through an oven at a temperature of 170° C. at 35 m/min. At this time, the weight of the paper was 80g/m ² , and the size of the paper was 1220mm×2440mm.

2. The paper was impregnated with the aforementioned melamine resin a second time, and then passed through an oven at 170° C. at 35 m/min.

3. The paper was passed through a cooler containing cooling water in a roller to prepare a surface protection material from LPM, the surface of which was hardened. At this time, the surface protection material was cut into a sheet of 1250 mm X 2500 mm.

[Example]

1. On both sides of 18 mm thick MDF [Foresco MDF RF, Foresco, Korea], attach the above-mentioned surface protection material to a thickness of 0.1 mm for 70 seconds at a temperature of 150 ° C and a pressure of 20 kgf/cm ² MDF) with LPM attached to the side was prepared.

2. After applying the above-mentioned UV adhesive to a thickness of 45㎛ on the upper surface of the raw material, an A-PET film having a thickness of 188㎛ was seated and adhered for 80 seconds at a pressure of 20kgf/cm ² .

3. The UV adhesive between the raw material and the A-PET film was cured by irradiating 2600 mj/cm ² of UV light with a UV irradiator to prepare an interior panel.

[Comparative Example 1]

An interior panel was manufactured in the same manner as in Example 1, but the UV adhesive was cured by irradiating an ultraviolet ray of 2000 mj/cm ² instead of the ultraviolet ray of 2600 mj/cm ² described above to prepare an interior panel.

[Comparative Example 2]

An interior panel was manufactured in the same manner as in Example 1, but instead of the above-described UV adhesive, isobornyl acrylate 4.4 kg, hydroxyethyl methacrylic acid 2.6 kg, 2-hydroxy-2-methylpropiophenone 1.5 kg, 4 - An interior panel was manufactured using a UV adhesive prepared by mixing 0.5 kg of acryloyl morpholine, 0.5 kg of butylate hydroxytoluene, and 0.5 kg of bis-trimethylbenzoylphenylphosphine oxide.

[Experimental example]

The interior panel manufactured according to Comparative Examples 1 and 2 described above was tested for 4 hours through a QUV accelerated weather resistance tester [Q-Lab, USA], and the color difference value b was analyzed, and the results are shown in Table 1 below. .

Referring to Table 1, it was confirmed that the color difference value of the interior panels manufactured by Comparative Examples 1 and 2 exceeded 1 and yellowing occurred.

Although described above with reference to preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention as set forth in the following claims. You will understand that you can.

10: base plate 20: first surface protection material
30: UV adhesive part 40: transparent film part
50: second surface protection material

Claims (5)

An interior comprising a base plate, a surface protection material attached to the upper surface of the base plate to provide waterproofness, a UV adhesive formed by applying a UV adhesive to the upper surface of the surface protection material, and a transparent film part attached to the upper surface of the UV adhesive In the panel for
The UV adhesive is
40 to 59% by weight of urethane acrylate, 16 to 24% by weight of isobornyl acrylate, 7 to 11% by weight of tetrahydrofurfuryl acrylate, 14 to 20% by weight of benzyl acrylate and 2 -Hydroxy-2-methyl-1-phenyl-1-propanone is included in 3 to 5 wt%, and cured with an ultraviolet light amount in the range of 2500 to 2700mj/cm ² to form the UV adhesive part An interior panel with yellowing resistance. delete The method of claim 1,
When the surface protection material is a white low-pressure melamine impregnated paper (LPM), the adhesive is an interior panel having yellowing resistance, characterized in that it further comprises titanium dioxide. delete The method of claim 1, wherein the ultraviolet light is
An interior panel having yellowing resistance, characterized in that it is ultraviolet light having a wavelength of 320 to 455 nm.

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