KR101843812B1 - Paint composition for preparing magnetic-screen board - Google Patents

Abstract

The present invention relates to a paint composition for preparing a magnetic screen board and a method for forming a magnetic screen board using the paint composition. According to the paint composition of the present invention, a magnetic screen board which allows users to write using a board marker, to easily attach a magnetic member and the like by having magnetic force on the surface, and to use the board as a screen for a beam projector, by simply applying and drying the paint composition on a general wall surface existing in daily life.

Description

TECHNICAL FIELD [0001] The present invention relates to a paint composition for forming a magnetic screen board,

The present invention relates to a coating composition for forming a magnetic screen board and a method for forming a magnetic screen board using the coating composition.

In classrooms, offices, academies, homes, etc., writing is done for various purposes such as education, meetings, and so on.

In this case, blackboards have traditionally been used as substrates to be handwritten. Specifically, blackboards have been used in which a paint is applied to an iron plate, a wood board, a synthetic resin substrate, or the like and a certain color is implemented.

For example, in the case of using chalk or the like as a writing instrument, a "Black Board" having a coating material for realizing green or black is generally used, and as a writing instrument, an aqueous or oily coating material such as a board marker Quot; white board ", which is made by applying synthetic resin to an iron plate or the like and realizing a shiny white, green or black waterproof surface, is generally used as a writing substrate.

The blackboard has a high surface roughness, and the dust separated from the chalk is left on the substrate, so that it can express the writing or drawing. In the case of the whiteboard, various colors of paint are applied and dried on the glossy surface of the whiteboard, I can express a picture or the like.

However, in the case of the blackboard, it is necessary to periodically apply the paint to form the roughness, to generate dust when writing or erasing the handwriting, and causing respiratory diseases such as neck, vocal cord-related diseases or asthma Problems have been pointed out, and whiteboards are widely used in recent years.

A white board uses a board marker on a smooth surface. If the white board is used for a long time in this manner, the surface of the white board is damaged by the solvent contained in the board marker, and writing marks are left, there was.

In addition, the white board has a problem that light is reflected due to its unique smooth surface, and the viewing angle is very narrow. In particular, there has been a problem that it is difficult to use digital imaging equipment, which is widely used in classrooms and meetings recently.

The present invention relates to a paint for forming a magnetic-screen board which can be handwritten using a board marker, has a magnetic property on its surface, is easily attached to a magnet member and can be used as a screen for a beam projector, Lt; / RTI >

In order to achieve the above object, the present invention provides an aqueous polyurethane-based resin composition comprising: an aqueous polyurethane-based binder resin; Magnetic metal particles; Quencher; And a solvent; A coating composition for forming a magnetic screen board is provided.

According to the coating composition of the present invention, even if it is coated and dried on a general wall surface existing around daily life, It is possible to form a magnetic screen board which can be handwritten using a board marker and has a magnetic property on its surface and is easily attached to a magnet member and can be used as a screen for a beam projector or the like.

Fig. 1 is a photograph of a window screen of a magnetic screen board according to a comparative example, which is irradiated with a beam projector. Fig.
Fig. 2 is a photograph of a blue screen illuminated by a beam projector on a magnetic screen board according to the embodiments of the present invention and a comparative example.
Fig. 3 is a photograph of the surface of a magnetic screen board according to Examples and Comparative Examples of the present invention observed under natural light conditions. Fig.
Fig. 4 is a photograph of the surface of the magnetic screen board according to the examples and the comparative examples of the present invention, after observing a white screen with a beam projector. Fig.

The terminology used herein is for the purpose of describing exemplary embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprising," "comprising," or "having ", and the like are intended to specify the presence of stated features, But do not preclude the presence or addition of one or more other features, integers, steps, components, or combinations thereof.

Also in the present invention, when referring to each layer or element being "on" or "on" each layer or element, it is meant that each layer or element is formed directly on each layer or element, Layer or element may be additionally formed between each layer, the object, and the substrate.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

In the present specification, a magnetic screen board has magnetic properties on its surface, and can easily attach a magnet member or the like, can perform writing using an aqueous or oily marker, and serves as a display screen of a beam projector Can, means board.

In the present specification, the term (meth) acrylate means a concept including both an acrylate and a methacrylate compound.

Hereinafter, the present invention will be described in detail.

A coating composition for forming a magnetic screen board according to one aspect of the present invention comprises an aqueous polyurethane-based binder resin; Magnetic metal particles; Quencher; And a solvent.

The coating composition according to the present invention should be capable of easily forming a magnetic screen board on various substrate surfaces existing in daily life.

The inventors of the present invention have found that when an aqueous polyurethane binder resin is used, it can be easily applied and dried, and even if a separate primer or the like is not used, it can be easily seen from around the daily life of concrete, wallpaper, It is possible to realize excellent adhesion to various wall surfaces which can be formed by the use of the adhesive.

According to one embodiment of the present invention, the polyurethane-based binder resin comprises 100 parts by weight of an isocyanate compound having two or more functional groups; And

50 to 100 parts by weight of a hydrophilic polyol compound having a weight average molecular weight of 1,000 to 5,000 g / mol and an OH equivalent of 500 to 3,500 g.

That is, in an isocyanate compound having a certain physical property and a hydrophilic polyol compound, an isocyanate group and a hydroxy group are cured while forming a urethane bond, so that a screen board can be easily formed on a surface having various properties.

When the content of the isocyanate compound and the hydrophilic polyol compound is out of the above range or the polyol compound is out of the above range of physical properties, the progress of the urethane reaction between the isocyanate group and the hydroxyl group is delayed, Or the urethane reaction proceeds excessively quickly to cause a problem that the surface of the coating film becomes poor due to the generation of bubbles or the adhesion of the coating film to the target substrate is lowered.

Particularly, in this case, it is preferable to use an acrylic polyol as the hydrophilic polyol compound, and it is preferable that the above-mentioned polyurethane binder has a urethane-acrylate form in view of formation of a magnetic screen board coating film desirable.

Such an acrylic polyol is specifically exemplified by (meth) acrylic acid, methyl (meth) acrylate, methyl (meth) acrylate, ethyl (meth) acrylate, butyl At least one acrylate-based monomer selected from the group consisting of styrene; And a copolymer of at least one hydroxy-acrylate monomer selected from the group consisting of hydroxyethyl (meth) acrylate and hydroxybutyl (meth) acrylate, but is not limited thereto , And acrylic polyols in which various kinds of acrylate compounds and hydroxy-acrylate compounds are copolymerized can be used.

The coating composition for forming a magnetic screen board of the present invention comprises magnetic metal particles. These magnetic metal particles serve to impart magnetism to the screen board surface thus formed. Accordingly, the user can easily attach the magnet member or the like to the screen board at the same time as handwriting, and thus can perform various types of presentations and the like.

The magnetic metal particles may include one or more metal elements or alloys selected from the group including, for example, iron (Fe), copper (Cu), nickel (Ni), and aluminum (Al).

The metal-containing alloy may be at least one selected from the group consisting of metal-ferrite, non-metal-ferrite, permalloy, neodymium-iron-boron alloy (NdFeB), AlNiCoAl alloy (AlNiCo), or samarium-cobalt alloy (SmCo) In addition, it is possible to use various types of magnetic metal particles having high compatibility with a polyurethane-based resin and having magnetic properties.

In addition, in the case of a general whiteboard, a coating composition is coated on a steel plate material and dried to realize a whitish white. In this case, it may be useful for writing with a board marker. However, visibility is deteriorated due to reflected light, Since it is very narrow, it is almost impossible to combine the role of a screen of a beam projector. However, according to the present invention, the inclusion of the magnetic metal particles causes the surface of the screen board to have a non-glazed light gray color, and a uniform surface roughness is generated, so that visibility becomes very high when the beam projector is used.

The magnetic metal particles may be used in an amount of about 1 to about 20 parts by weight based on 100 parts by weight of the aqueous polyurethane binder resin. For the coating properties of the coating composition and the effect of improving the visibility described above, about 1 to about 10 parts by weight And the number average particle size of such metal particles is preferably from about 10 占 퐉 to about 30 占 퐉. If the content of the magnetic metal particles is less than the above range, it may be difficult to attach the magnet member to the magnetic screen board to be manufactured. If the content exceeds the above range, the surface of the magnetic screen board to be manufactured becomes rough, It may become difficult to proceed or it may be difficult to remove the pigment adhered to the surface of the screen board by handwriting.

Further, the coating composition for forming a magnetic screen board of the present invention comprises a quencher. The light-quenching agent serves to reduce or eliminate the gloss realized on a general whiteboard surface, and it is particularly preferable to use hollow silica particles.

Such a hollow silica particle may have a number average particle diameter of about 300 탆 or more, specifically, about 300 탆 to about 500 탆. When particles having a particle size smaller than the above range are used, there is almost no quenching effect on the surface of the screen board to be implemented thereafter, and when used as a screen for a beam projector, visibility deteriorates and a viewing angle becomes very narrow , Particles having a particle diameter larger than the above range may be used, which may make it difficult to carry out handwriting by a board marker or cause a problem that remnants remain when the written contents are erased.

The quencher may be used in an amount of about 1 to about 30 parts by weight, preferably about 5 to 15 parts by weight, based on 100 parts by weight of the polyurethane-based binder resin. When the quencher is used in an amount less than the above range, the effect as a quencher which is anticipated is insufficient, and when the light emitted from a beam projector or the like is irradiated onto the magnetic screen board to be manufactured, And a problem may arise. In the case of using the extinction agent in an amount larger than the above range, application and drying of the composition are poor, and the surface of the magnetic screen board to be manufactured becomes rough, It is difficult to remove the pigment adhered to the surface of the screen board by writing or writing.

The coating composition for forming a magnetic screen board may contain an appropriate amount of an aqueous solvent. Water is most appropriate when considering the ease of preparation of the composition, coating property, dryness, etc. However, it is not limited thereto, and various aqueous solvents such as alcohol, acetone and the like may be mixed in addition to water.

Such a solvent may be used in an amount of about 10 to about 100 parts by weight, preferably about 20 to about 100 parts by weight, or about 30 to about 70 parts by weight based on 100 parts by weight of the aqueous polyurethane binder resin.

When the amount of the solvent is less than that of the binder resin, there is a problem that the viscosity of the composition increases sharply and the application and drying of the composition become poor. When the solvent contains too much solvent as compared with the binder resin, A problem may arise in that a pigment such as a board marker penetrates into the inside of the coating film formed by the composition on the board, resulting in unevenness and erasure.

According to another embodiment of the present invention, the coating composition for forming a magnetic screen board may further comprise a pigment, a dispersant, and an additive.

Examples of the pigment include titanium oxide, zinc oxide, indium oxide, tin oxide, antimony tin oxide, indium tin oxide, molybdenum oxide, tantalum oxide, vanadium oxide, An inorganic pigment; And / or

Organic pigments such as carbon black, anthraquinone, phthalocyanine, and benzimidazolone may be used.

Pigments are generally used to impart color to paints, in particular in this case, by reducing the gloss of the paint and by implementing a specific color on the surface of the screen board, which can be used to improve visibility when used in handwriting and beam projector screens do.

Such a pigment is preferably used in an amount of about 10 to about 30 parts by weight based on 100 parts by weight of the polyurethane-based binder resin.

Examples of the dispersant include ethyl acetate, propyl acetate, butyl acetate, ethylene glycol methyl ether, diethylene glycol methyl ether, butylene glycol methyl ether, debutylene glycol methyl ester, propylene glycol methyl ether, dipropylene glycol methyl ether, Ethylbenzene and the like can be used in an appropriate amount in various dispersants generally used for improving the dispersibility in the field of the present invention.

According to another aspect of the present invention, there is provided a method of forming a magnetic screen board, comprising the step of applying and drying the above-described coating composition on a target substrate.

Best Mode for Carrying Out the Invention Hereinafter, the function and effect of the present invention will be described in more detail through specific examples of the present invention. It is to be understood, however, that these embodiments are merely illustrative of the invention and are not intended to limit the scope of the invention.

< Example >

Preparation of Coating Composition for Magnetic Screen Board Formation

(Preparation of first composition)

Preparing a polyacrylate polyol having a weight average molecular weight of 2,500 g / mol and an OH equivalent of 1,500 g as a hydrophilic polyol compound;

Iron powder having a number average particle diameter of 20 占 퐉 and aluminum powder having a number average particle diameter of 10 占 퐉;

Hollow silica particles having a number average particle diameter of 350 mu m as a quenching agent;

Water as solvent;

Xylene n-butyl acrylate, and ethylbenzene were used as dispersants.

Specifically, the hollow silica particles, the magnetic metal particles and the dispersant were added to the solvent, and the stirring was performed so that the hollow silica particles and the magnetic metal particles were sufficiently dispersed. Then, the above-mentioned polyacrylate polyol was slowly added under stirring progress to prepare a first composition to be used as a subject.

(Preparation of second composition)

As the isocyanate compound, 1,6-hexamethylene diisocyanate, xylene, n-butylacrylate, and ethylbenzene as dispersants were added while stirring to prepare a second composition to be used as a by-product.

As described above, a two-pack coating composition was prepared in the form of the first composition and the second composition.

Specific compositions are shown in Tables 1 to 3 below.

ingredient Remarks content (wt%) Example 1 Reference Example 1-1 Reference example
1-2 The first composition Polyacrylate polyol Hydrophilic polyol 19 19 19 Xylene Dispersant 4 4 4 n-butyl acrylate Dispersant 2 2 2 Ethylbenzene Dispersant 0.5 0.5 0.5 Water solvent 19.5 22.5 16.5 Hollow silica particles Quencher 4 One 7 Iron / aluminum powder Magnetic metal particles One One One The second composition 1,6-hexamethylene- Isocyanate 30 30 30 Diisocyanate n-butyl acrylate Dispersant 7.5 7.5 7.5 Ethylbenzene Dispersant 3.5 3.5 3.5 Xylene Dispersant 9 9 9

ingredient Remarks content (wt%) Example 2 Reference example
2-1 Reference example
2-2 The first composition Polyacrylate polyol Hydrophilic polyol 19 19 19 Xylene Dispersant 4 4 4 n-butyl acrylate Dispersant 2 2 2 Ethylbenzene Dispersant 0.5 0.5 0.5 Water solvent 17.5 20.4 10.5 Hollow silica particles Quencher 4 4 4 Iron / aluminum powder Magnetic metal particles 3 0.1 10 The second composition 1,6-hexamethylene- Isocyanate 30 30 30 Diisocyanate n-butyl acrylate Dispersant 7.5 7.5 7.5 Ethylbenzene Dispersant 3.5 3.5 3.5 Xylene Dispersant 9 9 9

ingredient Remarks content (wt%) Example 3 Reference example
3-1 Reference example
3-2 The first composition Polyacrylate polyol Hydrophilic polyol 19 25 10 Xylene Dispersant 4 4 4 n-butyl acrylate Dispersant 2 2 2 Ethylbenzene Dispersant 0.5 0.5 0.5 Water solvent 19.5 15.5 28.5 Hollow silica particles Quencher 4 4 4 Iron / aluminum powder Magnetic metal particles One One One The second composition 1,6-hexamethylene- Isocyanate 30 30 30 Diisocyanate n-butyl acrylate Dispersant 7.5 7.5 7.5 Ethylbenzene Dispersant 3.5 3.5 3.5 Xylene Dispersant 9 9 9

In addition, as a comparative example, a coating composition for forming a magnetic screen board was prepared by mixing the same iron / aluminum particles as in the above example to 1 wt% in a commercially available whiteboard forming paint.

The coating compositions prepared in the above Examples, Reference Examples and Comparative Examples were evenly coated on the surface of a gypsum board with a paint roller and then dried for 5 hours to obtain a magnetic screen board having an average coating thickness of about 500 μm to about 700 μm .

The following evaluations were conducted on the magnetic screen board.

< Experimental Example >

Magnetic comparison experiment

(Ii) attaching a button-type magnet used for magnet board on the surface of a magnetic screen board, (i) attaching well and (ii) moving without external force, (iii) attaching Was evaluated.

Extinction  evaluation

When the surface of the magnetic screen board is irradiated with a beam projector (PT-VX600, manufactured by Panasonic Corporation, 5500 ANSI Lumens) and observed with naked eyes, △, when the writing contents can be recognized, and ○, when the light sticking phenomenon does not occur.

Handwriting and clearing assessment

The surface of the board marker pen was observed by repeating the erasing with the eraser for the white board 100 times (20 cm x 20 cm) with a board marker on the surface of the magnetic screen board, It was observed whether the pigment of the board marker remained on the surface.

When there is no significant damage to the pen tip of the board marker, the tip of the pen tip of the board marker is damaged, and the writing thickness is changed from the initial point,

In addition, when the board marker pigment remained on the surface of the magnetic screen board, X was evaluated when the mode marker pigment was cleanly removed.

The evaluation results are summarized in the following table.

Magnetic comparison Extinction evaluation take notes Clear Example 1 ○ ○ ○ ○ Reference Example 1-1 ○ △ ○ ○ Reference Example 1-2 ○ ○ ○ ○ Example 2 ○ ○ ○ ○ Reference Example 2-1 △ ○ ○ ○ Reference Example 2-2 ○ ○ △ X Example 3 ○ ○ ○ ○ Reference Example 3-1 ○ ○ X X Reference Example 3-2 ○ ○ ○ X Comparative Example ○ X X X

Referring to Table 4, it can be seen that, in the case of the embodiment of the present invention, the magnetism is excellent and the writing and erasing can proceed smoothly in writing, and in particular, the excellent light- Can be prevented.

On the other hand, in the case of the comparative example using the existing magnetic screen board, the magnetism was satisfactorily satisfied, but it was confirmed that the light leaning phenomenon occurred so that the writing contents could not be recognized in the central part of the screen board. In addition, due to the added material for the purpose of enhancing the magnetism, the surface of the magnetic screen board manufactured was very rough, and after 100 times of writing, the board marker was severely damaged and the writing could not be made. As a result, it can be confirmed that the existing whiteboard eraser causes irregularities.

Fig. 1 is a photograph of a window screen of a magnetic screen board according to a comparative example, which is irradiated with a beam projector. Fig.

Referring to FIG. 1, it can be clearly seen that a light bulging phenomenon occurs in the central portion of the magnetic screen board, and the light is very bright.

Fig. 2 is a photograph of a blue screen illuminated by a beam projector on the magnetic screen boards according to Examples and Comparative Examples of the present application. Fig.

Referring to FIG. 2, it can be clearly seen that the central portion of the comparative example shines brightly. However, in the case of the present embodiment, it is clearly confirmed that such a light scattering phenomenon does not occur, have.

Fig. 3 is a photograph of a surface of a magnetic screen board according to the embodiments of the present invention and a comparative example observed under natural light conditions. Fig. 4 is a photograph of the surface of a magnetic screen board according to an embodiment of the present invention and a comparative example, This is a photograph taken after a white screen is illuminated.

Referring to FIG. 3, it can be seen that both the examples and the comparative examples of the present invention do not exhibit a light-leaning phenomenon particularly in the natural light state.

However, referring to FIG. 4, in the case of the embodiment of the present invention, even when a white screen is realized by a beam projector, a light-leaning phenomenon does not occur in particular, whereas in the comparative example, a light- Can be confirmed.

Claims (9)

An aqueous polyurethane-based binder resin;
Magnetic metal particles;
Quencher; And
A solvent;
The polyurethane-based binder resin is a polyurethane-
100 parts by weight of an isocyanate compound having at least two functional groups; And
50 to 100 parts by weight of a hydrophilic polyol compound having a weight average molecular weight of 1,000 to 5,000 g / mol and an OH equivalent of 500 to 3,500 g;
Coating composition for forming a magnetic screen board.
delete The method according to claim 1,
Wherein the hydrophilic polyol compound is an acrylic polyol.
The method of claim 3,
The acrylic polyol (Acrylic Polyol) comprises:
At least one acrylate monomer selected from the group consisting of (meth) acrylic acid, methyl (meth) acrylate, methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate and styrene; And
Acrylate monomers selected from the group consisting of hydroxyethyl (meth) acrylate and hydroxybutyl (meth) acrylate;
Coating composition for forming a magnetic screen board.
The method according to claim 1,
The magnetic metal particles comprising:
At least one metal element or alloy selected from the group consisting of iron (Fe), copper (Cu), nickel (Ni), and aluminum (Al);
Coating composition for forming a magnetic screen board.
The method according to claim 1,
Wherein the magnetic metal particles have a number average particle diameter of 10 mu m to 30 mu m.
The method according to claim 1,
Wherein the quenching agent comprises hollow silica particles.
The method according to claim 1,
A paint composition for forming a magnetic screen board, further comprising a pigment, a dispersant, and an additive.
Applying a magnetic coating composition for forming a magnetic screen board according to any one of claims 1 to 8 on a target substrate and drying the coating composition.

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