KR200209446Y1 - Board available for marker-pen - Google Patents

Abstract

According to the disclosed design, when a known chromate-plated metal plate 1 or a plating layer is formed, a primer coating of white and green series in which a main resin is a high molecular weight linear polyester resin and a crosslinking resin is a melamine resin is formed on the plating layer 2. Coated primer coating layer (4) is formed, and the polyurethane resin as the main resin, containing a mixture of acryl resin and vinyl resin of the BMA (buthyl meta acrylate) series as an additional resin, prepared using a carbon black pigment Black ink as a black ink with a gravure printing process on the inner surface of the amorphous polyester film (6) and the gravure printing layer (6) and marker pens with excellent eraseability, writing, wear resistance, durability, and visual fatigue. The heat-sealable amorphous polyester film (8), in which the transparent UV layer (7) has been removed and coated on the outer surface of the amorphous polyester film (6), is formed on the primer coating layer (4). Generated is provided with a laminated marker pens blackboard heat fusion type amorphous polyester film.

Description

Blackboard for marker pen laminated with heat-sealing amorphous polyester film {BOARD AVAILABLE FOR MARKER-PEN}

The present invention relates to a blackboard for marker pens laminated with a plastic film, and more specifically, to form a dedicated primer coating layer on a chromate-treated metal plate to impart corrosion resistance, and a dark-printing layer for each function on the primer coating layer. And heat-sealing amorphous polyester film having a transparent UV layer structure, which has excellent adhesiveness, eraseability, writing resistance, wear resistance, durability, and visual fatigue by only simple roll pressing without adhesive coating process in a continuous work process. The present invention relates to a blackboard for marker pens in which a fused amorphous polyester film is laminated.

Generally, the boards used for educational and memo boards are classified into white boards and green boards, and wood boards made of plywood coated with room temperature two-component paints and room temperature and thermosetting type according to the base material. It is classified as a steel blackboard using a plated steel sheet coated with a two-component paint, and can be further classified into chalk and marker pens depending on writing instruments.

Such a conventional blackboard has a problem of productivity loss due to not only complicated manufacturing process but also long production period due to sheet-type manufacturing system, and as a writing instrument, chalk has a human body caused by dust of chalk dust. There are problems such as adverse effects on the environment.

On the other hand, in the case of the green blackboard for chalk is used to produce a blackboard made of wood and steel as the base material as disclosed in Korean Patent Publication No. 93-8158, but writing instruments must be used as chalk, There are serious problems such as acting as a cause of environmental pollution and respiratory disorders in the human body. Also, in the case of the whiteboard for the marker pen with paint coating, it is possible to protect the human body and the environment from the dust of chalk powder by using the marker pen, but it is not suitable for ergonomics because it can only feel the diffuse reflection caused by high gloss and the eye fatigue caused by this. I have a problem.

The purpose of the present invention was to develop a long-term research result in consideration of all the problems of the conventional boards as described above, and it is possible to use a marker pen such as aqueous, water-soluble, oily, etc., not chalk, so that the damage of dust caused by chalk powder The heat-sealing non-crystalline polyester film coated with transparent UV coating, which is designed to be able to escape from the surface and has excellent erase, writing, abrasion resistance, and durability, and especially to eliminate visual fatigue, By laminating a metal plate coated with a primer of green series, it is possible to provide an eco-friendly marker board for eco-friendly concept, which can shorten work process and improve work yield.

1 is a surface cross-sectional view of a blackboard for a marker pen laminated with a heat-sealed amorphous polyester film prepared according to the present invention

＊ Explanation of symbols on main part of drawing ＊

1: Base metal plate 2: Plating layer

3. Chromate layer 4. White and green primer coat layer

5. Black line printing layer 6. Amorphous polyester film layer

7. Transparent U.V layer 8. Polyester film with dark line printing and U.V coating

9. Blackboard for marker pen laminated with heat-sealing amorphous polyester film

In order to achieve the above object, the present invention has a plated layer formed on a plated or plated metal plate known in the art.

The primary resin is a high molecular weight linear polyester resin and the crosslinking resin is a melamine resin with a primer coating layer (4) roll coated with a primer coating of white and green series and a polyurethane resin. Dark line printing layer (5) comprising a gravure printing process on the inner surface of the amorphous polyester film (6) containing a mixture of an acrylic resin and a vinyl resin as an additive resin, and using a black black pigment. Heat-sealing amorphous polyester coated on the outer surface of the amorphous polyester film (6) with a transparent UV layer (7) that has excellent eraseability, writing, wear resistance, and durability, and eliminates visual fatigue. The film 8 provides a blackboard for marker pens on which the primer coating layer 4 is laminated.

Hereinafter, the present invention will be described in detail.

As the base steel sheet, most of known metals such as zinc-aluminum-silica alloy hot-dip galvanized steel sheets, electroplated and hot dip galvanized steel sheets can be applied.

The polyester film used in the present invention is a commercially available amorphous polyester (copolymer-polyethylene terephthalate, also known as co-PET) film having excellent heat sealability, and is produced and sold by SL10 (trade name). There is also a commercially available SL10U (trade name) produced and sold by SKC Corporation.

The primer coating layer functions to improve the adhesion between the steel sheet surface and the polyester film layer and to impart a white or green base color according to the pigment used.

In case of whiteboard, white primer is produced by using TiO2 white pigment, and it shows white base color effect.In case of greenboard, oil such as chrome green, cyanine blue, iron oxide yellow, carbon black, etc. Using green pigments to prepare and apply primers of green series shows green base color (BASE COLOR) effect.

The primer coating layer 4 has an inseparable functional relationship with the amorphous polyester film layer 8 treated with the dark line printing and the transparent UV layer formed thereon. If there is any undesirable difference, problems such as adhesion between the coating films, coating hardness, coating crack during processing, yellowing due to ultraviolet rays may occur. In addition, the primer coating is coated on the steel sheet and there is no bubble generation during drying by hot air in the post-process for curing, it is necessary to use a good adhesion to the film layer, workability, weather resistance.

The base material (main resin) of the primer paint is a high molecular weight flexible (linear) polyester resin having a molecular weight of 5,000 to 10,000 and a glass transition temperature (Tg) of 10 to 20 ° C. to maintain the flexibility of the coating film. good.

In order to maximize the elongation, polyhydric alcohols such as ethylene glycol are used so that functional groups such as hydroxy group (-OH), carboxyl group (-COOH), etc., which are generally possessed in the main chain of the resin, have a linear structure. Therefore, it is necessary to suppress the formation of functional groups as much as possible to produce them.

The crosslinking resin (curing agent) used to form the coating film for the main resin (base material) of the primer paint is a mixed melamine resin of methylation and butylation. Commercially available RESIMINE 755, RESIMINE 757, RESIMINE 751 (from SOOLUTIA), CYMEL 1168, CYMEL 1170, CYMEL 232 (from CYTEL).

As the curing accelerator, sulfonic acids such as P-Toluene Sulfonic Acid and Dinonyl Naphthalene Solfonic Acid masked with epoxy resin are used.

Moreover, in order to improve adhesiveness, you may use auxiliary crosslinking resin of a primer paint. Here, isocyanates in the unyellowed form, such as masked hexamethylene diisocyanate, are used.

In the exclusive primer paint of the present invention, organic or inorganic pigments exhibiting white or green series can be used without limitation. In addition, a U.V filler may be added to improve UV resistance.

As described above, the primer paint is a general resin used for pre-coated metal (PCM) paint, due to the difference in the characteristics of the laminated film, after the coating treatment, hot air drying during the popping (Poping) and non-adhesion between the film and the coating film, It has a large elongation in addition to general corrosion resistance, which is the basic physical property as a paint coating, strengthening adhesion between the film layer and the plated steel sheet, surface smoothness (complete surface leveling), etc., without problems such as surface leveling and coating cracks during processing. By sufficient buffering action at the interface between the steel sheet and the coating film, the crack of the steel sheet generated during processing does not develop to the PET film layer, but serves to be absorbed in the undercoat layer.

It is preferable that a primer coating has the following composition ratios.

Table 1

division ingredient Content (weight ratio)% Suzy Polyester Resin 20-40 Melamine resin 4-15 Urethane resin 1 to 10 Auxiliary resin 0.3 to 3 Fee Organic / inorganic pigments 15 to 35 additive DEFORMING AGENT 0.5 to 1.0 LEVELLING AGENT 0.5 to 1.0 UV FILLER 0.5 to 1.0 Solvent HYDROCARBON SYSTEM 15-25 ESTER system 15-25

As the coating method of the primer paint, a roll coating method is used, and the dry coating thickness is preferably 10 to 20 µm, even more preferably 14 to 15 µm. The reason is that when the thickness of the dry coating film is 10 μm or less, workability and hiding power are inferior, and when the thickness of the dry coating film is 20 μm or more, the adhesiveness and economical efficiency of the base marker pen are poor.

As the baking conditions, the atmosphere temperature conditions to be baked according to the width and thickness of the metal plate body, LINE SPEED should be changed, but it is preferable to make the PMT 160-230 ℃ in the continuous line of the PCM.

Hereinafter, a description will be given of the dark line printing layer 5 to be gravure printed on the inner surface of the amorphous PET film 6 and the transparent U.V coating layer 7 to be treated on the outer surface.

As the ink used in the conventional PET / PVC film, only the basic physical properties of color expression and UV resistance were used, but in the case of thermally fused amorphous PET, the dark-ray printed layer 5 treated on the inner surface of the film was formed by heat. Between the interface between the fused film 6 and the primer paint 4, mutual adhesion, heat resistance, UV resistance and the like are required, and a transparent UV layer 7 coated on the outer surface of the film 7 The marker pen must not only have excellent eraseability and writing, wear resistance and durability, but also no visual fatigue.

To this end, in the present invention, in the case of the dark line printing layer 6

Molecular weight of 15,000-130,000 SP (Softening Point) 150-200 ° C., preferably 30,000-100,000 in consideration of mutual adhesiveness, printability, UV resistance, etc. between PET film layer 6 and dedicated primer layer 4 Polyurethane resin having a molecular weight of is used as the main resin. In this case, when the molecular weight is less than 15,000, blocking is likely to occur, and more than 130,000 decreases the adhesion and affinity for the pigment.

As additional resins, BMA (buthyl meta acrylate) -based acrylic resins to give adhesiveness and printability to printing films, and VAGH, VMCH, VYHH, VMCC, VYNS of vinyl resins to improve the flexibility and adhesion of printing films -3 (manufactured by US Union Carbide) is used. In addition, for compatibility between resins, aromatic, acetate and ketone solvents are used, and preferably, acetate is used as the main solvent.

As the pigment used, a carbon black pigment having heat resistance, UV resistance and solvent resistance is used.

Finally, the UV clear used for the transparent UV layer processed on the outer surface of the amorphous PET film 6 for erasability, handwriting, abrasion resistance, durability, etc., is conventionally used by gravure printing treatment using acrylic resin as the main resin. However, in this case, the durability, scratch resistance and adhesiveness had a disadvantage in short life. In order to make up for this point, the present invention is to treat a polyester film layer 6 surface with a UV curable resin having excellent eraseability, writing resistance, abrasion resistance, durability, solvent resistance, and adhesion. The transparent UV layer 7 used for this purpose is formed by a photopolymerizable prepolymer (hereinafter referred to as oligomer), a photoinitiator and a photopolymerizable monomer. The oligomers used as base curable resins include SP or VR series products (above trade names), which are bisphenol A resins from Japan's fire-extinguishing polymers, which are excellent in high hardness, chemical resistance, and adhesion. Can be used. The photoinitiator acts as a polymerization initiator by activating the unsaturated group in the base curable resin when it receives external ultraviolet rays. Generally, it uses a stable and inexpensive benzophenon system (Benzophenon). For this reason, it is preferable to use 1-hydroxy cyclohexyl phenyl ketone, which is acetophenone, having good curing degree and weather resistance. Such photoinitiators include, for example, the trade name Irgacure 184C manufactured by Ciba-geigy.

The photopolymerizable monomer is a polymerization component (also serves as a solvent). Existing solvents are volatilized or incorporated into the atmosphere, causing air pollution, but can be considered environmentally friendly in that polymerization is possible without such volatile components. HDDA (1,6-Hexane diol diacrylate), which has good solubility and flexibility, is high in low viscosity among bifunctional groups, high crosslinking density and reactivity in trifunctional groups, low viscosity trimethylol propane triacrylate (TMPTA), high crosslinking density Dipentaerithritol hexacrylate (DPHA), which is a fast curing agent, is appropriately mixed.

Other additives alone are not activated by UV irradiation, but when used together with photoinitiators, a sensitizer having excellent effects and a storage stabilizer for improving cow storage stability are used. As the sensitizer, fatty acid amines having a high curing rate are mainly used, and quaternary ammonium chloride, diethyldioxy amine, cyclic amide, and nitrile compound are used as storage stabilizer.

In order to relieve visual fatigue due to diffuse reflection, the surface gloss is generally lowered to obtain a visual effect, but there is a disadvantage in that the eraseability is inferior due to the roughness of the surface.

In the present design, ED20 or ED30 having excellent surface lubrication and scratch resistance by treating organic wax on the surface with fine particles in syloid (product of GRACE DAVISON), which is amorphous SILICA, in order to compensate for these disadvantages and maintain physical properties such as eraseability It is prepared using 0.1 to 1.0 weight ratio based on 100% by weight of UV paint.

As shown in FIG. 1, the coating film structure of the blackboard for the marker pen on which the thermally fused amorphous polyester film is laminated is largely the thermally fused amorphous polyester film layer (8) and the primer coating layer (4). And three layer structures of the metal plate body (1). In other words, transparent UV coating is applied to the surface of the film 6 for clarity and writeability, and gravure printing is applied to the inner surface of the film to improve mutual adhesion between the primer coating 4 and the amorphous PET film 6 and to impart dark lines. A thermally fused amorphous polyester film (8) consisting of a printing layer (5) is placed on a surface of a general CR and galvanized steel sheet (EG, Gl), G / L, G / A plate coated with a dedicated primer paint. After drying with hot air, it is pressed down and bonded using its own adhesive strength.

Hereinafter will be described a production example according to the present invention.

In the continuous coating line, the coating type chromate was applied on the plating layer (2) of the base metal plate (1) by a thin film with a thin film at a line speed of 20 to 80 MPM and rolled to PMT (peak metal temperature) of 60 to 140 ° C. Drying with hot air at the temperature conditions to form a chromate layer (3) of 20 ~ 80mg / ㎡. On top of that, a primer coating made of a flexible polyester resin as a main resin as a PCM (pre-coated metal) coating for heat fusion is roll-coated so as to have a dry film thickness of 10 to 20 μm, and then the PMT 160 to 230 ° C. in a hot air drying oven. It heats and dries to form the primer coating layer 4. Gravure printing and UV coating heat-sealed amorphous polyester film 8 on the surface of primer coating layer 4 heated to PMT 160 ~ 230 ° C. in a continuous process. Press-bond (laminate) using a steel roll.

The thickness of each layer of the film 8 used in the blackboard for marker pen on which the heat-sealable polyester film of the present invention is laminated is preferably about 1 to 2 μm of the dark ray printed layer 6 and about 10 to 100 μm of amorphous It consists of the polyester film layer 6 and the transparent UV layer 7 of about 1-3 micrometers.

Table 2 is a test result of evaluating the physical properties of the thermally bonded amorphous polyester film prepared according to the present invention laminated with a marker pen and a conventional one.

Table 2. Evaluation results of physical properties of the blackboard for marker pen laminated with heat-sealing amorphous polyester film

Product Category  Test Items Wood blackboard (For chalk) Iron board (For chalk) Glossy white Iron board (For marker pen) Thermal Fusion Chalkboard (For Marker Pen) White green 1. Polished (600) 4 5 87 74 66 2. Surface Hardness H- 2H- 2H- 2H- 2H- 3. Solvent resistance Great Good Good Good Good 4. Handwriting Great Great Good Good Good 5. Erasability usually usually Great Good Good

[Test Methods]

1. Gloss (600): The gloss measurement value of the surface of the coating film using the gloss measuring device (by BYK, Germany)

2. Surface Hardness: Mitsubishi Uni-pencil withstand limit value

3. Solvent resistance: After gauze (pharmaceutical gauze No. 3) is wound 5 times on the tip of the index finger and middle finger,

Surface condition when rubbed 50 times with enough MEK solvent

4. Handwriting: When writing with chalk and marker pen, the writing is easy and clear.

5. Erase: After writing with black / blue / red marker pen, the eraser is erased with marker pen eraser

As can be seen in Table 2, the marker board for laminating the thermally fused amorphous polyester film according to the present invention is more environmentally friendly than the conventional paint-coated wood and steel boards, and the side of human protection, handwriting and eraseability. It can be seen that they are equivalent or better in terms of physical properties.

As described above, the marker pen blackboard in which the heat-sealed amorphous polyester film of the present invention is laminated exhibits excellent physical properties in terms of eraseability and handwriting, etc., compared to conventional blackboards, and is a conventional two-component coating material at room temperature and thermosetting. It has the advantage of being able to manufacture as a cheaper manufacturing price in pursuit of process shortening, work yield improvement, environmentally friendly, economical aspects than painted wood and steel board.

Claims (4)

If a known chromate-plated metal plate (1) or a plated layer is formed, a primer coated with a white or green primer coating having a high molecular weight linear polyester resin and a crosslinking resin (melamine resin) on the plated layer (2) The coating layer 4 is formed, and a polyurethane resin is used as the main resin, and a mixture of acryl resin and vinyl resin of BMA (buthyl meta acrylate) series as an additional resin is added to the black ink manufactured using a carbon black pigment. The gravure printing layer 5, the gravure printing process on the inner surface of the amorphous polyester film 6, and the transparent UV layer excelling in eraseability, writing resistance, abrasion resistance, and durability of the marker pen, and eliminating visual fatigue (7) ) Is an amorphous polyester film (6) formed on the primer coating layer (4) of a thermally fused amorphous polyester film (8) coated on the outer surface of the amorphous polyester film (6) The film is laminated marker pens board. The method of claim 1, wherein the primer coating has a number average molecular weight of 5,000-10,000 and a glass transition temperature of 10-20 ℃ polyester resin 20-40%, melamine resin 4-15%, urethane resin 1-10%, isocyanate Heat-sealing amorphous polyester, characterized in that it comprises a mixture consisting of 0.3-3%, pigment 7-40%, hydrocarbon and ketone-based, ester mixed solvent 30-50%, other additives 1-2% Blackboard for marker pen with film laminated. The blackboard for marker pens according to claim 1, wherein the thickness of each layer is in the following range. When the plating layer is formed, the thickness of the plating layer: 15-23㎛ Thickness of chromated layer: 20-80mg / ㎡ Dry film thickness of white and green primer paints: 10-20㎛ Dark line printing layer thickness: 1-2㎛ Thickness of heat fused amorphous polyester film layer: 10-100㎛ Thickness of Transparent UV Coating Layer: 1-3㎛ The primer coating layer (4) according to claim 1, wherein the primer coating layer (4) contains TiO ₂ white pigments for white boards, and for green boards, chromium green, cyanine blue, iron oxide yellow, carbon black and the like. Blackboard for marker pen laminated with a heat-sealing amorphous polyester film, characterized in that it comprises a pigment.