KR101479405B1 - Coating composition for decoration sheet and method for manufacturing decoration sheet using the same - Google Patents

Abstract

The present invention relates to a coating composition for a decorative sheet and a method for producing the decorative sheet using the same, wherein the coating composition for a decorative sheet comprises 20 to 30 parts by weight of a bifunctional water dispersible urethane acrylate oligomer; 20 to 30 parts by weight of 6-functional water-dispersed urethane acrylate oligomer; 2 to 5 parts by weight of a photoinitiator; And 20 to 30 parts by weight of water; Which is environmentally friendly, has excellent hardness and high elongation, and a method for producing a decorative sheet using the above-mentioned coating composition.
The present invention has the following effects.
First, since an organic solvent such as a solvent is not used in the present invention, even after ultraviolet curing of the coating composition, there is no surface residue due to the smell of the solvent in the dried coating film and it is environmentally friendly.
Secondly, since ultraviolet curing is performed after the molding process, the present invention can produce a coating composition using a high hardness material such as a hexahydric water dispersible urethane acrylate oligomer, and can provide a coating composition having high hardness and high elongation properties Can be manufactured.
Third, the present invention has an effect of having excellent adhesion to a PVC film.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative material for a decorative sheet and a method for manufacturing a decorative sheet using the decorative sheet.

The present invention relates to a coating composition for a decorative sheet and a method for producing a decorative sheet using the same.

Existing ultraviolet curing type decor sheet is prepared by coating ultraviolet curing type paint for decorative sheet by microgravure coating method on one side of PVC film, completely curing by irradiating ultraviolet rays, and molding in a material having a certain frame .

With respect to the conventional technique of ultraviolet ray curable coating composition, Korean Patent Registration No. 10-0762766 (hereinafter referred to as "prior art") discloses an ultraviolet ray curable coating composition and a method of forming an ultraviolet ray curable coating film using the same .

However, since the conventional technique is a process in which molding is performed after ultraviolet curing, when a coating composition is prepared from a material having a high hardness, cracks may occur in the coating layer during the ultraviolet curing process. That is, conventionally, since a paint has to be prepared with a composition having a low hardness in order to prevent cracking, there is a problem that it is difficult to secure hardness as desired by a consumer. In addition, since conventional coating compositions contain an organic solvent such as a solvent, they are not environmentally friendly.

Therefore, there is a demand for development of a coating composition that is environmentally friendly and excellent in hardness.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a coating composition which is environmentally friendly, has excellent hardness and high elongation properties.

It is another object of the present invention to provide a method for producing a decor sheet using the above-mentioned coating composition.

In order to accomplish this object, a coating composition for a decorative sheet according to an aspect of the present invention comprises 20 to 30 parts by weight of a bifunctional water-dispersible urethane acrylate oligomer; 20 to 30 parts by weight of 6-functional water-dispersed urethane acrylate oligomer; 2 to 5 parts by weight of a photoinitiator; And 20 to 30 parts by weight of water; . ≪ / RTI >

The coating composition for a decorative sheet may also contain 1 to 2 parts by weight of a dispersant; As shown in FIG.

And, the coating composition for a decorative sheet comprises 6 to 10 parts by weight of a quencher; As shown in FIG.

In addition, the coating composition for a decorative sheet may contain 1 to 2 parts by weight of a leveling agent; As shown in FIG.

Furthermore, the coating composition for a decorative sheet may contain 0.5 to 1 part by weight of a defoaming agent; As shown in FIG.

According to another aspect of the present invention, there is provided a method for producing a decorative sheet, comprising the steps of: A) preparing a coating composition for a decorative sheet containing a polyfunctional water-dispersed urethane acrylate oligomer; A step B of coating the coating composition prepared in the step A onto a polyvinyl chloride (PVC) film; A step C for drying the PVC film coated in the step B; A step D for molding the PVC film dried in the step C; And a step E for irradiating ultraviolet rays on the PVC film formed in the step D to cure the PVC film; . ≪ / RTI >

Here, the coating composition for a decorative sheet produced in the step A comprises 20 to 30 parts by weight of a bifunctional water-dispersible urethane acrylate oligomer; 20 to 30 parts by weight of 6-functional water-dispersed urethane acrylate oligomer; 2 to 5 parts by weight of a photoinitiator; And 20 to 30 parts by weight of water; . ≪ / RTI >

In step C, the PVC film may be dried at a temperature of 60 to 90 DEG C for 1 to 5 minutes.

In step E, the amount of ultraviolet light to be irradiated on one side of the PVC film may be 500 to 700 mJ / cm 2.

As described above, the present invention has the following effects.

First, since an organic solvent such as a solvent is not used in the present invention, even after ultraviolet curing of the coating composition, there is no surface residue due to the smell of the solvent in the dried coating film and it is environmentally friendly.

Secondly, since ultraviolet curing is performed after the molding process, the present invention can produce a coating composition using a high hardness material such as a hexahydric water dispersible urethane acrylate oligomer, and can provide a coating composition having high hardness and high elongation properties Can be manufactured.

Third, the present invention has an effect of having excellent adhesion to a PVC film.

1 is a flow chart showing a method of manufacturing a decor sheet according to the present invention.

The preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings, in which the technical parts already known will be omitted or compressed for simplicity of explanation.

≪ Description of Coating Composition >

The coating composition for a decorative sheet for use in the present invention comprises a photoinitiator, a bifunctional water-dispersed urethane acrylate oligomer, a hexahydroxy-dispersed urethane acrylate oligomer and water, and may be prepared by further adding a dispersant, a quencher, a leveling agent, have.

That is, the coating composition for a decorative sheet can be composed of a photoinitiator, a bifunctional water-dispersed urethane acrylate oligomer and a hexahydric water-dispersed urethane acrylate oligomer as main components and a dispersing agent, a quencher, a leveling agent and a defoaming agent.

Specific examples of the bifunctional water-dispersible urethane acrylate oligomer that can be used in the present invention include LUX121, LUX130, LUX241, LUX2411, LUX390 (ALBERDINGKOLEY), and XP 2420 (Bayer). Products with 6 functional water-dispersed urethane acrylate oligomers can be used such as LUX101, LUX308, LUX584 (ALBERDINGKOLEY), UVLS 2280, UV2282, UVLS2317, UVXP2661, UVXP2629 (Bayer).

Examples of the photoinitiator include Irgacure 500, 2959 and 819 DW (Ciba Geigy). Examples of the dispersing agent include Byk-154, 180, 187, 190, 194 (BYK) and the like. Examples of quenching agents include HK-400, OK-412, OK-607 and TS-100 (EVONIK). Examples of leveling agents include Byk-307, 320, 331, 342, 377, 3500, 358N and 3441 (BYK). Examples of antifoaming agents include Byk-018 (BYK), Byk-024 (BYK), Byk-028 (BYK), Byk-093 (BYK) and Byk-1710 (BYK).

 Here, the photoinitiator preferably comprises 2 to 5 parts by weight. This is because if the amount of the photoinitiator is less than 2 parts by weight, the curability tends to deteriorate, and if it exceeds 5 parts by weight, the light resistance and the tensile strength are deteriorated.

The bifunctional water-dispersible urethane acrylate oligomer preferably comprises 20 to 30 parts by weight. This is because if the bifunctional water-dispersed urethane acrylate oligomer is less than 20 parts by weight, there is a problem that the tack-free property is poor and the hardness is lowered when the amount is more than 30 parts by weight.

The hexafunctional water-dispersed urethane acrylate oligomer preferably comprises 20 to 30 parts by weight. This is because if the hexafunctional water-dispersed urethane acrylate oligomer is less than 20 parts by weight, the hardness and stain resistance deteriorate.

In one embodiment of the present invention, the functional group of the water-dispersed urethane acrylate oligomer means a reactive acrylate group. When the water-dispersed urethane acrylate oligomer having a hexa number of more than 6 is used, In order to realize the physical property of the phase, it is preferable to use the hexahydrodispersed urethane acrylate oligomer to obtain the effect of satisfying the hardness, adhesion, stain resistance and the like.

Meanwhile, the coating composition for a decorative sheet according to an embodiment of the present invention preferably contains 1 to 2 parts by weight of a dispersant. If the amount of the dispersing agent is less than 1 part by weight, coagulation of the light-extinguishing agent occurs, resulting in somewhat poor paint retention. When the dispersing agent is more than 2 parts by weight, compatibility with the paint is poor.

Further, the coating composition for a decorative sheet preferably contains 6 to 10 parts by weight of a quencher. When the light extinction agent is less than 6 parts by weight, the light extinction effect is lowered and it is difficult to achieve the desired light fineness. When the light extinction agent is more than 10 parts by weight, side effects such as white spots on the surface appearance of the paint surface occur.

It is also preferable that the coating composition for a decorative sheet contains 1 to 2 parts by weight of a leveling agent. If the leveling agent is less than 1 part by weight, surface wettability may deteriorate. If the leveling agent is more than 2 parts by weight, surface appearance may be deteriorated.

Byk-306, Byk-307, Byk-320, Byk-325, Byk-331, Byk-333, Byk-342, Byk-3500 and Byk-3530 can be used as the leveling agent. Byk-346, Byk-3500, and the like can be used.

The coating composition for a decorative sheet preferably contains 0.5 to 1 part by weight of a defoaming agent. If the amount of the antifoaming agent is less than 0.5 parts by weight, the defoaming property may deteriorate. If the amount of the antifoaming agent is more than 1 part by weight, defoaming of the surface leveling property may occur because the antifoaming agent is strong.

Byk-018, Byk-014, Byk-018, Byk-024, Byk-1710 and Byk-1719 can be used in the present invention. have.

<Description of Method>

A method for manufacturing a decor sheet according to the present invention will be described with reference to the flowchart shown in FIG.

1. Preparation of Coating Composition <S101>

In this step, a process for producing a coating composition for a decorative sheet is carried out using a polyfunctional water-dispersed urethane acrylate oligomer. That is, in this step, 20-30 parts by weight of a bifunctional water-dispersed urethane acrylate oligomer, 20-30 parts by weight of a hexahydrated water-dispersed urethane acrylate oligomer, 2 to 5 parts by weight of a photo initiator and 20-30 parts by weight of water are mixed, And a dispersing agent, a quencher, a leveling agent and a defoaming agent may be further added to the above-mentioned composition for decor sheet.

2. Coating step < S102 >

In this step, the coating composition prepared in step S101 is coated on a polyvinyl chloride (PVC) film. In one embodiment of the present invention, when coating a coating composition, a coating liquid is supplied to a microgravure roller, and the microgravure roller is rotated in contact with the coated material while being rotated in a direction opposite to the moving direction of the coated material, A micro gravure coating method in which a coating liquid applied to a gravure roller is applied to a coating material can be used.

3. Drying step < S103 >

In this step, the coated PVC film is dried in step S102. At this time, the PVC film is dried in an oven at a temperature of 60 to 90 DEG C for 1 to 5 minutes, preferably at a temperature of 80 DEG C for 2 minutes.

If the temperature is lower than 60 占 폚 or the drying time is less than 1 minute in this step, the drying efficiency is lowered. If the temperature exceeds 90 占 폚 or the drying time exceeds 5 minutes, cracks may occur. Or less.

4. Molding step < S104 >

In this step, the PVC film dried in step S103 is inserted into the molding chamber and molded at a high temperature. Here, it is preferable that the temperature of the molding chamber is maintained at a temperature of at least 120 캜 at least in view of the thermocompression efficiency, and the process of molding the PVC film coated with the paint into a material having a certain frame is well known in the art. A description thereof will be omitted.

5. Curing step < S105 >

In this step, the process of curing the PVC film formed in step S104 by irradiating a certain amount of ultraviolet rays is performed. That is, one side of a PVC film formed by using a UV curing machine (Hg Lamp) is irradiated with ultraviolet rays, and the irradiation amount of ultraviolet rays irradiated on one side of the PVC film is maintained at 500 to 700 mJ / cm 2.

If the ultraviolet irradiation dose is less than 500 mJ / cm 2 in this step, the coating composition is not cured or hardness is lowered. If the ultraviolet irradiation dose exceeds 700 mJ / cm 2, the light resistance is lowered and yellowing may occur. It is preferable to irradiate ultraviolet rays within the light amount range.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the scope of the present invention is not limited to the following examples.

<Examples>

The coating composition for a decorative sheet according to an embodiment of the present invention was prepared by measuring the physical properties and the like of the coating composition by various experimental methods as described below, and for the purpose of defining the properties by means obvious to those skilled in the art Experimental methods were used. Here, the coating composition applied to the examples is a preferred embodiment in which the composition is tested in various mixing ratios, and the composition is the most favorable according to the conditions of thermal drying (Tack-free) and ultraviolet irradiation of UV curing machine (mercury lamp).

Experimental environmental condition

The experimental environment, that is, the place to conduct the experiment, shall be a place where there is no direct sunlight and very little gas, steam, dust and ventilation at a temperature of 20 ± 2 ° C and a humidity of 65 ± 5% (hereinafter referred to as "room temperature" Were left in the experiment for 72 hours after painting.

Evaluation of dry touch

The coating composition for decorative sheet was applied to the applied substrate, and dried for 1 to 2 minutes at 60 캜 to 80 캜 to evaluate touching dryness of the coating composition.

Hardenability evaluation

After applying the coating composition for decorative sheet to the applied substrate, it was dried at 80 DEG C for 2 minutes and then cured at an ultraviolet mercury lamp of 300 to 500 mJ / cm &lt; 2 &gt;, and then the curability of the coating composition was evaluated by fingernail scratching.

Gloss evaluation

The coating composition for decorative sheet was applied to the substrate, dried at 80 ° C for 2 minutes, and cured at an ultraviolet mercury lamp of 300 to 500 mJ / cm 2, and then measured with a polisher (60 ° Gloss).

Adhesion evaluation

The coating composition for a decorative sheet was coated on an applied substrate, dried at 80 ° C for 2 minutes, cured at an ultraviolet mercury lamp of 300 to 500 mJ / cm 2, and subjected to a cross cutting test method for a cured coating film. At this time, a glass tape was used. The film or layer formed on the specimen was cut into 100 pieces of checkerboard pieces having a size of 1 mm * 1 mm, and then a glass tape was attached on the section, and the number of the separated pieces was measured to evaluate the adhesion.

Hardness evaluation

The hardness was evaluated by using a Mitsubishi pencil at an angle of 45 ° and applying a load of 1 kg to determine whether the coating was abnormal when moving 2 cm.

Weatherability evaluation

The weathering resistance was evaluated by measuring the E (weatherability) of the specimen for 1300 hours using a Weather-O-meter (Irradiance: 300 to 400 nm, 66 W / m 2 = 6.6 mW / cm 2).

Elongation evaluation

The elongation test was carried out at 80 ° C for 2 minutes, and then the specimen was cut into a width (2 cm) * length (10 cm) specimen, dried in an oven at 130 ° C. for 3 minutes and pulled with a constant force until the coating cracked Lt; / RTI &gt;

Table 1 shows the composition and content of the coating composition for decor sheet according to one embodiment of the present invention.

ingredient content Photoinitiator 3 parts by weight Bifunctional water-dispersed ultraviolet curing type urethane acrylate oligomer 25 parts by weight 6-functional water-dispersed ultraviolet curing type urethane acrylate oligomer 30 parts by weight Dispersant 1 part by weight Quencher 8 parts by weight Leveling agent 1 part by weight Defoamer 0.5 parts by weight water 28 parts by weight

Table 2 shows the evaluation results of the touch-drying process according to the drying conditions of the decorative sheet paint composition shown in Table 1. &lt; tb &gt; &lt; TABLE &gt;

Drying conditions Tack-free 60 DEG C x 1 min X 60 ° C × 2 min X 70 DEG C x 1 min X 70 ° C × 2 min X 80 DEG C x 1 min △ 80 ° C × 2 min Good

Tables 3 to 5 show evaluation results of physical properties of the coating composition for decor sheets of Table 1 according to ultraviolet light quantity and drying conditions.

Light quantity 300 mJ / cm 2 Drying conditions 80 ° C × 2 min Polish 4.5 Hardenability Bad Attachment 90/100 Pencil hardness F ~ H Weatherability (E) 0.9 Elongation (%) 300% or more

Light quantity 400 mJ / cm 2 Drying conditions 80 ° C × 2 min Polish 4.2 Hardenability Good Attachment 100/100 Pencil hardness 2H Weatherability (E) 0.85 Elongation (%) 300% or more

Light quantity 500 mJ / cm 2 Drying conditions 80 ° C × 2 min Polish 4.4 Hardenability Good Attachment 100/100 Pencil hardness 3H Weatherability (E) 0.45 Elongation (%) 300% or more

As can be seen from the evaluation results of the physical properties shown in Tables 3 to 5, it was confirmed that the coating composition for a decorative sheet satisfied the optimum required physical properties by applying an ultraviolet light quantity of 500 mJ / cm 2 or more under a drying condition of 80 占 폚 for 2 minutes.

Accordingly, the coating composition for a decorative sheet for a decorative sheet and the method for producing a decorative sheet according to the present invention are environmentally friendly as compared with conventional coating compositions using an organic solvent, and as the ultraviolet curing is performed after the molding process, A high hardness paint can be prepared by using an oligomer.

In addition, since the present invention forms before UV curing, it is possible to produce a coating composition having high elongation properties.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. And the scope of the present invention should be understood as the following claims and their equivalents.

Claims (9)

20 to 30 parts by weight of bifunctional water-dispersed urethane acrylate oligomer;
20 to 30 parts by weight of 6-functional water-dispersed urethane acrylate oligomer;
2 to 5 parts by weight of a photoinitiator;
20 to 30 parts by weight of water; And
6 to 10 parts by weight of quenching; &Lt; RTI ID = 0.0 &gt;
Paint composition for decorative sheet. The method according to claim 1,
Wherein the coating composition for a decorative sheet comprises 1 to 2 parts by weight of a dispersant; &Lt; RTI ID = 0.0 &gt;
Paint composition for decorative sheet. delete The method according to claim 1,
The coating composition for a decorative sheet comprises: 1 to 2 parts by weight of a leveling agent; &Lt; RTI ID = 0.0 &gt;
Paint composition for decorative sheet. The method according to claim 1,
The coating composition for a decorative sheet may contain 0.5 to 1 part by weight of a defoaming agent; &Lt; RTI ID = 0.0 &gt;
Paint composition for decorative sheet. A step of preparing a coating composition for a decor sheet comprising a polyfunctional water-dispersed urethane acrylate oligomer;
A step B of coating the coating composition prepared in the step A onto a polyvinyl chloride (PVC) film;
A step C for drying the PVC film coated in the step B;
A step D for molding the PVC film dried in the step C; And
(E) a step of irradiating ultraviolet rays to the PVC film formed in the step (D) and curing the PVC film; / RTI &gt;
The coating composition for a decorative sheet produced in the step (A)
20 to 30 parts by weight of bifunctional water-dispersed urethane acrylate oligomer;
20 to 30 parts by weight of 6-functional water-dispersed urethane acrylate oligomer;
2 to 5 parts by weight of a photoinitiator;
20 to 30 parts by weight of water; And
6 to 10 parts by weight of quenching; &Lt; RTI ID = 0.0 &gt;
A method of manufacturing a decorative sheet. delete The method according to claim 6,
Wherein the PVC film is dried at a temperature of 60 to 90 DEG C for 1 to 5 minutes in the step (C)
A method of manufacturing a decorative sheet. The method according to claim 6,
Wherein the irradiation amount of the ultraviolet light irradiated on one side of the PVC film in the step E is 500 to 700 mJ /
A method of manufacturing a decorative sheet.

Images