KR101480156B1 - Environmentally-friendly water soluble resin composition for back cover of flat-panel display and back cover of flat-panel display using the same - Google Patents

Abstract

1 to 40% by weight of a water-dispersed polyurethane resin, 20 to 60% by weight of a modified acrylic resin, 1 to 20% by weight of a black pigment, 0.5 to 10% by weight of a rust inhibitive additive, 0.5 to 10% % And water balance, and a back cover for a flat display device using the same.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an environmentally-friendly water-soluble resin composition for a back cover of a flat display device, and a back cover for a flat display device using the same. BACKGROUND OF THE INVENTION 1. Field of the Invention [0002]

To an environmentally-friendly water-soluble resin composition for a back cover of a flat display device, and to a back cover of a flat display device using the same.

As consumers' demands for products are diversified and global environmental regulations are strengthened, there is a growing need for development of highly functional environmentally friendly surface treatment products. In particular, the use of steel, which can replace injection plastics in the display industry, is expanding in accordance with the policy of increasing the environmental labeling and recycling rate of products.

2. Description of the Related Art A flat panel display for home appliances such as a liquid crystal display (LCD) TV, a plasma display panel (PDP) TV, and a light emitting diode (LED) TV has a back cover covering various units for displaying a flat image from the back side In the case of the flat display including the black plate, the black plate is mainly used. Research on a flat display device including such a back cover is actively under way, and Japanese Patent Application Laid-Open No. 2008-023975 can be referred to for example.

The black steel sheet is formed of an oil-based black resin composition containing mainly an organic solvent to form a coating film having a thickness of 15 to 20 탆, causing environmental pollution in the production process and generating costs for facilities such as treatment of harmful substances There is a problem of.

One embodiment of the present invention is to provide an environmentally-friendly water-soluble resin composition for a back cover of a planar display device that is excellent in corrosion resistance, adhesion, hardness, black appearance, solvent resistance, processability, weatherability and impact resistance.

Another embodiment is to provide a back cover of a flat display device using an environmentally-friendly water-soluble resin composition for a back cover of the flat display device.

One embodiment includes 1 to 40 weight percent water dispersible polyurethane resin; 20 to 60% by weight of a modified acrylic resin; 1 to 20% by weight of a black pigment; 0.5 to 10% by weight of a rust inhibitive additive; 0.5 to 10% by weight of a quencher; 0.5 to 6% by weight of acrylic beads; And a water balance portion. The present invention also provides an eco-friendly water-soluble resin composition for a back cover of a flat display device.

The modified acrylic resin may include a vinyl-modified acrylic resin, a silicone-modified acrylic resin, an epoxy-modified acrylic resin, or a combination thereof.

The black pigment may be carbon black, graphite, carbon nanotubes, or a combination thereof.

The rust inhibitive additive may include a titanate compound, a zirconium compound, a phosphoric acid compound, or a combination thereof.

The quencher may include silica, magnesium oxide, polypropylene wax, polytetrafluoroethylene wax, polyethylene modified tetrafluoroethylene wax, canoe bar wax or combinations thereof.

The pH of the environmentally-friendly water-soluble resin composition may be from 8.5 to 9.5, the specific gravity may be from 1.04 to 1.07, the viscosity may be from 25 to 40 seconds upon discharge from the Din Cup (# 4 Din 53211) % ≪ / RTI >

Another embodiment includes a substrate; A primer layer positioned over the substrate and formed from the primer layer composition; And a top coat layer formed on the under coat layer and formed from the environmentally-friendly water-soluble resin composition.

The substrate may comprise electro-galvanized steel.

The undercoat composition may comprise from 10 to 50% by weight of an aqueous polyurethane resin, from 1 to 40% by weight of a modified acrylic resin, from 1 to 10% by weight of a rust inhibitive additive, from 0.5 to 5% by weight of a crosslinking agent, and a balance of water.

The crosslinking agent is a silane coupling agent of 3-aminopropyltriepoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane or a combination thereof; Metal silicates of lithium polysilicate, sodium polysilicate, potassium polysilicate or combinations thereof; Or a combination thereof.

The pH of the subbing layer composition can be from 8.5 to 9.5, the specific gravity can be from 1.01 to 1.03, the viscosity can be from 10 to 13 seconds upon exit from the Din Cup (# 4 Din 53211), the solids content is from 18 to 23 weight %. ≪ / RTI >

The thickness of the undercoat layer may be 1.0 to 1.5 占 퐉, and the thickness of the uppermost layer may be 4.0 to 6.0 占 퐉.

Other details of the embodiments of the present invention are included in the following detailed description.

Corrosion resistance, adhesion, hardness, black appearance, solvent resistance, processability, durability and impact resistance as well as an environmentally friendly back cover of a flat display device can be realized.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a photograph showing the appearance of a coating film formed using an environmentally-friendly water-soluble resin composition for a back cover of a flat display device of Example 6. FIG.
Fig. 2 is a photograph of the plate corrosion resistance of a coating film formed using the environmentally-friendly water-soluble resin composition for a back cover of the flat panel display device of Example 6. Fig.
3 is a photograph showing corrosion resistance of a piercing processed portion of a coating film formed using an environmentally-friendly water-soluble resin composition for a back cover of a flat display device of Example 6. Fig.
4A to 4C are graphs showing the results obtained when the processability of the bending portion of the coating film formed using the environmentally-friendly water-soluble resin composition for back cover of the flat display device of Example 6 was 0%, 10% and 20% It is a photograph measuring the presence or absence of peeling with a tape.
5 is a photograph showing the solvent resistance of a coating film formed using an environmentally-friendly water-soluble resin composition for a back cover of a flat panel display device of Example 6. Fig.
Fig. 6 is a photograph of the coating film formed using the environmentally-friendly water-soluble resin composition for a back cover of the flat panel display device of Example 6, for measuring the seam allowance.
7 is a photograph showing the impact resistance of a coating film formed using the environmentally-friendly water-soluble resin composition for a back cover of the flat display device of Example 6. Fig.
8 is a photograph showing heat resistance of a coating film formed using the environmentally-friendly water-soluble resin composition for a back cover of the flat display device of Example 6. Fig.
9 is a photograph of the coefficient of friction of a coating film formed using the environmentally-friendly water-soluble resin composition for a back cover of the flat panel display device of Example 6. Fig.

Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited thereto, and the present invention is only defined by the scope of the following claims.

The environmentally-friendly water-soluble resin composition for a back cover of a flat display device according to an embodiment can include an aqueous dispersion polyurethane resin, a modified acrylic resin, a black pigment, a rust inhibitive additive, a quencher, an acrylic bead and water.

The environmentally-friendly water-soluble resin composition may be water-soluble because water is used as a solvent. When the water-soluble resin composition is used to form a back cover of a flat display device, it can be eco-friendly in process and cost-saving compared to the use of an oil-based resin composition using an organic solvent.

Further, the environmentally-friendly water-soluble resin composition composed of the above components is excellent in corrosion resistance, adhesion, hardness, black appearance, solvent resistance, processability, resistance to breakage and impact resistance.

The water-dispersed polyurethane resin is obtained by neutralizing a polyurethane prepolymer prepared by reacting a polyester polyol, a diisocyanate and a crosslinking agent with a neutralizing agent and then dispersing the polyurethane prepolymer in water to react with a diamine as a chain extender to form a cross- have.

The number average molecular weight of the water-dispersed polyurethane resin may be 100,000 to 300,000. Further, the steel sheet can be provided with excellent adhesion, workability, and ductility at a proper mixing ratio of a hard segment and a soft segment constituting the water-dispersed polyurethane resin.

The water-dispersible polyurethane resin may be contained in an amount of 1 to 40% by weight, and more specifically 10 to 30% by weight based on the total amount of the environmentally-friendly water-soluble resin composition. When the water-dispersed polyurethane resin is used within the above-mentioned content range, various balance of physical properties can be obtained when used in a back cover of a flat display device. Specifically, it is possible to prevent a coating film crack, As the resin can be used in a small amount, the cost can be reduced.

The modified acrylic resin is a resin developed to impart elasticity to the rigid properties possessed by acrylic resins and to improve corrosion resistance.

The modified acrylic resin may include a vinyl-modified acrylic resin, a silicone-modified acrylic resin, an epoxy-modified acrylic resin, or a combination thereof. The vinyl-modified acrylic resin and the silicone-modified acrylic resin give excellent elasticity, and the epoxy-modified acrylic resin can impart excellent corrosion resistance.

The modified acrylic resin may be contained in an amount of 20 to 60% by weight based on the total amount of the environmentally-friendly water-soluble resin composition, and specifically 30 to 50% by weight. When the modified acrylic resin is used within the above-mentioned content range, various balance of physical properties can be obtained when used in a back cover of a flat display device, and specifically excellent in solvent resistance and corrosion resistance.

By using the above black pigment, the black appearance of the back cover of the flat display device can be shown.

The black pigment may be carbon black, graphite, carbon nanotubes, or a combination thereof. Among them, the carbon black may be used in consideration of economical efficiency and blackness. The carbon black may have an average particle diameter of 100 to 1000 nm, specifically 100 to 500 nm.

The black pigment may be included in an amount of 1 to 20% by weight based on the total amount of the environmentally-friendly water-soluble resin composition, and specifically 5 to 10% by weight. When the above-mentioned black pigment is used within the above-mentioned content range, various physical property balance can be obtained, and specifically, the surface appearance and texture are excellent.

The rust inhibitive additive is an additive added to further improve the basic corrosion resistance property of the main resin.

The rust inhibitive additive may include a titanate compound, a zirconium compound, a phosphoric acid compound, or a combination thereof.

Examples of the titanate compound include, but are not limited to, titanium acetylacetonate, isopropyl ditriethanol aminotitanate, and the like.

Examples of the zirconium compound include zirconium acetylacetonate and zirconium lactate, and these may be used alone or in combination with a polymeric phosphate compound.

The rust inhibitive additive may be included in an amount of 0.5 to 10% by weight, and more preferably 1 to 5% by weight based on the total amount of the environmentally-friendly water-soluble resin composition. When the rust inhibitive additive is used within the above-mentioned content range, various balance of physical properties can be obtained when used in the back cover of the flat display device, and a particularly excellent rust prevention effect can be obtained.

By using the quencher, the gloss of the back cover of the flat display device can be reduced.

The quencher may include silica, magnesium oxide, polypropylene wax, polytetrafluoroethylene wax, polyethylene modified tetrafluoroethylene wax, canoe bar wax or combinations thereof.

The quencher may be contained in an amount of 0.5 to 10% by weight, and more preferably 1 to 5% by weight based on the total amount of the environmentally-friendly water-soluble resin composition. When the quencher is used within the above-mentioned content range, a desired degree of appearance gloss can be achieved without affecting various physical properties when used in a back cover of a flat display device.

By using the acrylic beads, a superior surface texture of the back cover of the flat display device can be exhibited and the scratch resistance can be improved.

The acrylic beads may be included in an amount of 0.5 to 6% by weight based on the total amount of the environmentally-friendly water-soluble resin composition, and may be contained in an amount of 1 to 3% by weight. When the acrylic beads are used within the above content range, various balance of physical properties can be obtained when used in a back cover of a flat display device, and specifically excellent surface texture and scratch resistance can be obtained.

The eco-friendly water-soluble resin composition may have a pH, a specific gravity, a viscosity, and a solid content within a predetermined range in order to obtain various physical properties balance.

For example, the pH of the environmentally-friendly water-soluble resin composition may be 8.5 to 9.5, and more specifically 8.8 to 9.5. The specific gravity may be 1.04 to 1.07, specifically 1.05 to 1.07. The viscosity may also be 25 to 40 seconds, more specifically 30 to 40 seconds, under the measurement conditions of the Dean cup (# 4 Din 53211). The solid content may be 28 to 33% by weight, and specifically 30 to 32% by weight. The eco-friendly water-soluble resin composition controlled within the above range can have excellent balance of physical properties such as corrosion resistance, adhesion, hardness, black appearance, solvent resistance, processability and durability.

The environmentally-friendly water-soluble resin composition can be used for a back cover of a flat display device. The flat panel display device may be a display device such as an LCD, an LED, or a PDP. The back cover is positioned on the back of a TV or the like and covers various units for displaying a flat image on the back surface.

The back cover of the flat display device may include a substrate, a sublayer disposed above the substrate, and a top layer positioned over the sublayer.

The substrate may be made of electro-galvanized steel.

The upper layer forms the outer surface of the back cover of the flat display device.

The upper layer may be formed using the above-described environmentally-friendly water-soluble resin composition. Accordingly, a back cover of a flat display device having excellent black appearance and surface texture as well as excellent corrosion resistance, adhesion, hardness, solvent resistance, workability, durability and impact resistance can be realized.

The thickness of the upper layer may be 4.0 to 6.0 탆, specifically 5.0 to 6.0 탆. When the thickness of the upper layer is within the above range, excellent balance of physical properties such as corrosion resistance, adhesiveness, hardness, solvent resistance, processability, black appearance and weather resistance can be obtained.

The undercoat layer functions to buffer between the substrate and the upper layer to provide strong adhesion between the substrate and the upper layer.

The subbing layer may be formed of a subbing layer composition comprising an aqueous dispersed polyurethane resin, a modified acrylic resin, a rust inhibitive additive, a crosslinking agent and water.

The undercoat layer composition may be water-soluble using water as a solvent, such as the environmentally-friendly water-soluble resin composition used for the top layer. Accordingly, it is eco-friendly in terms of the use of the oil-based resin composition using an organic solvent, and the cost can be reduced.

The water-dispersed polyurethane resin is the same as the water-dispersed polyurethane resin used in forming the above-mentioned upper layer.

The water-dispersed polyurethane resin may be contained in an amount of 10 to 50% by weight, specifically 20 to 40% by weight based on the total amount of the undercoat layer composition. When the water-dispersed polyurethane resin is used within the above-mentioned content range, the adhesion and workability of the primer layer are excellent.

The modified acrylic resin is the same as the modified acrylic resin used in forming the upper layer described above.

The modified acrylic resin may be contained in an amount of 1 to 40% by weight, and more specifically 10 to 30% by weight based on the total amount of the undercoat layer composition. When the modified acrylic resin is used within the above-mentioned content range, it is excellent in solvent resistance and corrosion resistance.

The rust inhibitive additive is the same as the rust inhibitive additive used in the formation of the upper layer described above.

The rust inhibitive additive may be included in an amount of 1 to 10% by weight based on the total amount of the undercoat layer composition, specifically, 2 to 5% by weight. When the rust inhibitive additive is used within the above-mentioned content range, excellent rust preventing effect can be obtained and corrosion resistance can be improved.

The crosslinking agent may improve the adhesion between the substrate and the upper layer on the lower side.

The crosslinking agent is a silane coupling agent of 3-aminopropyltriepoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane or a combination thereof; Metal silicates of lithium polysilicate, sodium polysilicate, potassium polysilicate or combinations thereof; Or a combination thereof.

The crosslinking agent may be contained in an amount of 0.5 to 5% by weight, and more preferably 1 to 3% by weight based on the total amount of the undercoat layer composition. When the cross-linking agent is used within the above-mentioned content range, the adhesion between the substrate and the upper layer can be improved.

The undercoat layer composition may have a pH, a specific gravity, a viscosity and a solid content within a predetermined range in order to obtain various physical property balance.

For example, the pH of the undercoat layer composition can be from 8.5 to 9.5, and specifically from 8.8 to 9.3. The specific gravity may be 1.01 to 1.03, and specifically 1.02 to 1.03. The viscosity may also be 10 to 13 seconds, more specifically 10 to 12 seconds, under the conditions of the Dean cup (# 4 Din 53211) measurement. The solid content may be 18 to 23% by weight, and specifically 20 to 22% by weight. The eco-friendly water-soluble resin composition controlled within the above range can have excellent balance of physical properties such as corrosion resistance, adhesion, hardness, black appearance, solvent resistance, processability and durability.

The thickness of the undercoating layer may be 1.0 to 1.5 占 퐉, specifically 1.2 to 1.5 占 퐉. When the thickness of the undercoating layer is within the above range, excellent balance of physical properties such as corrosion resistance, adhesion, hardness, solvent resistance and processability can be obtained.

Hereinafter, specific embodiments of the present invention will be described. However, the embodiments described below are only intended to illustrate or explain the present invention, and thus the present invention should not be limited thereto.

(Preparation of environmentally-friendly water-soluble resin composition)

The specifications of the components used in the preparation of the environmentally-friendly water-soluble resin composition are as follows.

As the water-dispersed polyurethane resin, VS-8308A (A1-1), VS-8238 and VS-8572A manufactured by Victor Chem were mixed and used.

As the modified acrylic resin, VAC-507S and VAC-920R manufactured by Victor Chem were mixed and used.

As the black pigment, Carbon Black FW 200 from Evonik and Carbon Black MA-100 from Mitsubishi were mixed.

Tyzor TE ^® products from Dupont and Zircore ^® from Dupont were used as anti - rust additives.

Acematt TS 100 from Evonik and Fluo30XF from MPI were used as the quencher.

Acrylic beads were made by Art Pearl of Negami Co.,

Water was used as a solvent.

Example  1 to 6 and Comparative Example  1 to 13

Each component was mixed with the compositions shown in Tables 1 and 2, and the mixture was stirred at a speed of 400 rpm for 30 minutes using a high-speed stirrer to prepare an eco-friendly water-soluble resin composition.

Example One 2 3 4 5 6 Water-dispersed polyurethane resin (% by weight) 10 30 30 30 30 30 Modified acrylic resin (% by weight) 50 30 40 40 45 45 Black pigment (% by weight) 10 10 5 10 10 10 (% By weight) 5 5 5 One 5 5 (% By weight) 5 5 5 5 5 5 Acrylic beads (% by weight) 3 3 3 3 One 3 Water (% by weight) 17 17 12 11 4 2

Comparative Example One 2 3 4 5 6 7 8 9 10 11 12 13 Water-dispersed polyurethane resin (% by weight) 50 - 45 30 10 30 30 30 30 30 30 30 30 Modified acrylic resin (% by weight) - 50 30 16 65 50 30 50 30 50 30 50 30 Black pigment (% by weight) 5 5 5 5 5 0.5 25 5 5 5 5 5 5 (% By weight) 5 5 5 5 5 5 5 0.1 15 5 5 5 5 (% By weight) 5 5 5 5 5 5 5 5 5 0.1 15 5 5 Acrylic beads (% by weight) 3 3.5 3 3 3 3 3 3 3 3 3 0.1 10 Water (% by weight) 32 31.5 7 36 7 6.5 2 6.9 12 6.9 12 4.9 15

(Production of coating film for back cover of flat display device)

Using an environmentally friendly water-soluble resin composition of Examples 1 to 6 and Comparative Examples 1 to 13, an environmentally-soluble water-soluble resin solution was coated on a 1.4 μm thick upper portion coated with a lower solution # 4 Bar coater to prepare a 5.5 μm thick film .

Evaluation 1: Appearance characteristics

The appearance characteristics of the coating films formed using the environmentally-friendly water-soluble resin compositions of Examples 1 to 6 and Comparative Examples 1 to 13 were evaluated. The results are shown in Fig. 1 and Table 3 below.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a photograph showing the appearance of a coating film formed using an environmentally-friendly water-soluble resin composition for a back cover of a flat display device of Example 6. FIG.

Referring to FIG. 1, it can be seen that when the environmentally-friendly water-soluble resin composition according to one embodiment is used, the black appearance quality and characteristics are excellent.

Further, the whiteness (L *) of the coating film was measured using a color difference meter (Minolta CR-400), and the value of 100-L * was shown in Table 3 below.

(Based on blackness evaluation)

○: 100-L * value is 23 or more and less than 24.5

?: 100-L * value is not less than 20 and less than 23, or not less than 24.5 and less than 25.5

X: 100-L * value is less than 20 or more than 25.5

Evaluation 2: Measurement of corrosion resistance

The corrosion resistance of the coating film formed using the environmentally-friendly water-soluble resin compositions of Examples 1 to 6 and Comparative Examples 1 to 13 was measured according to JIS E2731 standard, and the results are shown in Table 3 and FIG. The corrosion resistance was evaluated by white rust occurrence rate during 120 hours as a result of the salt spray test (SST).

(Corrosion resistance evaluation standard)

○: incidence of white rye less than 5%

△: incidence of white rye greater than 5% and less than 20%

X: incidence of white rye more than 20%

Fig. 2 is a photograph of the plate corrosion resistance of a coating film formed using the environmentally-friendly water-soluble resin composition for a back cover of the flat panel display device of Example 6. Fig.

Referring to FIG. 2, it can be seen that the corrosion resistance is excellent when the environmentally-friendly water-soluble resin composition according to one embodiment is used because the occurrence rate of the white rust is 0% for 120 hours.

Evaluation 3: Processability measurement

The processability of the coating films formed using the environmentally-friendly water-soluble resin compositions of Examples 1 to 6 and Comparative Examples 1 to 13 was measured, and the results are shown in the following Table 3, Fig. 3 and Figs. 4A to 4C.

The machinability was measured for the piercing part and the bending part respectively. The pierced part was pierced with a diameter of 10 mm, and the corrosion resistance test of 8 hours spraying and 16 hours pause was repeated three times. The measurement of the bending portion was carried out with 0% stretching, 10% stretching and 20% stretching, respectively, and the bending portion was measured for the presence or absence of peeling with a scotch tape.

(Evaluation Criteria for Workability)

○: No peeling

△: Less than 1 to less than 10 peelings occurred

X: More than 10 delaminations occurred

3 is a photograph showing corrosion resistance of a piercing processed portion of a coating film formed using an environmentally-friendly water-soluble resin composition for a back cover of a flat display device of Example 6. Fig. 4A to 4C are graphs showing a case where the processability of the bending portion of the coating film formed by using the environmentally-friendly water-soluble resin composition for back cover of the flat display device of Example 6 is 0%, 10% and 20% It is a photograph measuring the presence or absence of peeling with a Scotch tape.

Referring to FIG. 3 and FIGS. 4A to 4C, cracking does not occur at 0% and 10% elongation, and peeling is not caused. Therefore, it can be seen that the processability is excellent when an environmentally-friendly water-soluble resin composition according to one embodiment is used. Cracks were microscopically generated even when stretched at 20%, but did not peel off.

Rating 4: Solvent resistance  Measure

The coated film formed by using the environmentally friendly water-soluble resin compositions of Examples 1 to 6 and Comparative Examples 1 to 13 was subjected to repeated rubbing with gauzes soaked in methyl ethyl ketone (MEK) under the force of 1 Kgf, And the solvent resistance was measured. The results are shown in Table 3 and FIG.

(Evaluation criteria for solvent resistance)

○: Not peeled off more than 50 times

△: not peeled from 30 times or more and less than 50 times

X: Not peeled off less than 30 times

5 is a photograph showing the solvent resistance of a coating film formed using an environmentally-friendly water-soluble resin composition for a back cover of a flat panel display device of Example 6. Fig.

Referring to FIG. 5, it is understood that when the environmentally-friendly water-soluble resin composition according to one embodiment is used, rust-rubbing is repeated 50 times, and the solvent resistance is excellent.

Rating 5: Beak  Measure

The coating film formed using the green water-soluble resin composition of Example 6 was allowed to stand in boiling water at 100 캜 for one hour, and then the occurrence of a blister on the surface was observed. The results are shown in Fig.

Fig. 6 is a photograph of the coating film formed using the environmentally-friendly water-soluble resin composition for a back cover of the flat panel display device of Example 6, for measuring the seam allowance.

Referring to FIG. 6, it can be seen that when the environmentally-friendly water-soluble resin composition according to one embodiment is used, the blister resistance is excellent because no blister is generated.

Evaluation 6: Measurement of impact resistance

A coating film formed using the environmentally-friendly water-soluble resin composition of Example 6 was immersed in boiling water at 100 ° C for 1 hour, 1 kg steel ball was dropped at a height of 50 cm, and the surface of the coating film was observed with a 20- The results are shown in Fig.

7 is a photograph showing the impact resistance of a coating film formed using the environmentally-friendly water-soluble resin composition for a back cover of the flat display device of Example 6. Fig.

Referring to FIG. 7, it can be seen that when the environmentally-friendly water-soluble resin composition according to one embodiment is used, the impact resistance is excellent because cracks are not generated.

Evaluation 7: Heat resistance measurement

The heat resistance of the coating film formed using the environmentally-friendly water-soluble resin composition of Example 6 was measured by leaving the coating film in an oven at 200 캜 for 1 hour and evaluating the color difference before and after being left standing. The results are shown in Fig.

8 is a photograph showing heat resistance of a coating film formed using the environmentally-friendly water-soluble resin composition for a back cover of the flat display device of Example 6. Fig.

Referring to FIG. 8, it can be seen that when the environmentally-water-soluble resin composition according to one embodiment is used, the color difference value (? E) before and after leaving is 1.0 or less.

Evaluation 8: Measurement of friction coefficient

The coating film formed using the environmentally-friendly water-soluble resin composition of Example 6 was subjected to plane friction (load: 600 Kgf, moving distance of 20 cm / min: 10 cm) in the uncoated state, and the results are shown in Fig.

9 is a photograph of the coefficient of friction of a coating film formed using the environmentally-friendly water-soluble resin composition for a back cover of the flat panel display device of Example 6. Fig.

Referring to FIG. 9, since the friction coefficient is 0.2 or less, it can be seen that the friction characteristics are excellent when the environmentally-friendly water-soluble resin composition according to one embodiment is used.

Evaluation 9: Measurement of adhesion

Coating films formed using the environmentally-friendly water-soluble resin compositions of Examples 1 to 6 and Comparative Examples 1 to 13 were prepared by using a cross-hatch cutter at intervals of 1 mm at an interval of 10 cubic by 10 cubic by 10 cylinders, The scotch tape was completely adhered and then abruptly peeled off, and the adhesion of the coating film was measured. The results are shown in Table 3 below.

(Evaluation Criteria of Adhesion)

○: No peeling

△: 1 or more and 5 or less peeling occurred

X: More than 6 delaminations occurred

Evaluation 10: Hardness measurement

The coating film formed using the environmentally-friendly water-soluble resin compositions of Examples 1 to 6 and Comparative Examples 1 to 13 was drawn at a slope of 45 DEG with a 1H pencil manufactured by Mitsubishi Corporation under the load of 500 g, and then the degree of scratching Respectively. The results are shown in Table 3 below.

(Hardness evaluation standard)

○: No scratches in 5 lines

△: Scratches occur in more than 2 lines and less than 3 lines

X: Scratches more than 4 lines and less than 5 lines

Corrosion resistance Adhesiveness Hardness (1H) Blackness Solvent resistance (MEK) Processability Example 1 ○ ○ ○ ○ ○ △ Example 2 ○ ○ ○ ○ △ ○ Example 3 ○ ○ ○ △ ○ ○ Example 4 △ ○ ○ ○ ○ ○ Example 5 ○ ○ △ ○ ○ ○ Example 6 ○ ○ ○ ○ ○ ○ Comparative Example 1 ○ ○ ○ △ X ○ Comparative Example 2 ○ ○ X △ ○ ○ Comparative Example 3 ○ ○ ○ △ X ○ Comparative Example 4 ○ ○ ○ △ X ○ Comparative Example 5 ○ ○ ○ △ ○ X Comparative Example 6 ○ ○ ○ X ○ ○ Comparative Example 7 ○ ○ ○ X △ ○ Comparative Example 8 X ○ ○ △ ○ ○ Comparative Example 9 ○ ○ ○ △ X ○ Comparative Example 10 ○ ○ X ○ ○ ○ Comparative Example 11 ○ X ○ ○ ○ △ Comparative Example 12 ○ ○ X ○ ○ ○ Comparative Example 13 ○ X ○ ○ ○ △

It can be seen from Table 3 that when the environmentally-friendly water-soluble resin composition according to one embodiment is used, the corrosion resistance, the adhesion, the hardness, the black appearance, the solvent resistance and the workability are both excellent.

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, Of the right.

Claims (19)

1 to 40% by weight of a water-dispersed polyurethane resin;
20 to 60% by weight of a modified acrylic resin;
1 to 20% by weight of a black pigment;
0.5 to 10% by weight of a rust inhibitive additive;
0.5 to 10% by weight of a quencher;
0.5 to 6% by weight of acrylic beads; And
Water balance
Soluble resin composition for a back cover of a flat display device.
The method according to claim 1,
Wherein the modified acrylic resin is a vinyl-modified acrylic resin, a silicone-modified acrylic resin, an epoxy-modified acrylic resin, or a combination thereof.
The method according to claim 1,
Wherein the black pigment comprises carbon black, graphite, carbon nanotubes, or a combination of these carbon-based pigments.
The method according to claim 1,
Wherein the rust inhibitive additive is a titanate compound, a zirconium compound, a phosphoric acid compound or a combination thereof.
The method according to claim 1,
Wherein the quenching agent is silica, magnesium oxide, polypropylene wax, polytetrafluoroethylene wax, polyethylene-modified tetrafluoroethylene wax, canoe bar wax, or a combination thereof.
The method according to claim 1,
Wherein the pH of the environmentally-friendly water-soluble resin composition is 8.5 to 9.5.
The method according to claim 1,
Wherein the specific gravity of the environmentally-friendly water-soluble resin composition is 1.04 to 1.07.
The method according to claim 1,
The viscosity of the environmentally-friendly water-soluble resin composition is 25 to 40 seconds at the time of discharging from the Din cup (# 4 Din 53211).
The method according to claim 1,
The environmentally-friendly water-soluble resin composition for use in a back cover of a flat panel display device has a solid content of 28 to 33% by weight.
Board;
A primer layer positioned over the substrate and formed from the primer layer composition; And
And an upper layer formed on the undercoat layer and formed from the environmentally-friendly water-soluble resin composition of any one of claims 1 to 9
Wherein the back cover is a flat display device.
11. The method of claim 10,
The substrate may be a flat display device including electro-galvanized steel (EG), stainless steel (SUS), galvanized steel (GI), galvannealed steel (GA), aluminum (Al) Back cover.
11. The method of claim 10,
The undercoat layer composition
10 to 50% by weight of a water-dispersed polyurethane resin,
1 to 40% by weight of a modified acrylic resin,
1 to 10% by weight of a rust inhibitive additive,
0.5 to 5% by weight of a crosslinking agent, and
Water balance
Wherein the back cover is a flat display device.
13. The method of claim 12,
The crosslinking agent is a silane coupling agent of 3-aminopropyltriepoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane or a combination thereof; Metal silicates of lithium polysilicate, sodium polysilicate, potassium polysilicate or combinations thereof; Or a combination thereof.
13. The method of claim 12,
Wherein the pH of the subbing layer composition is 8.5 to 9.5.
13. The method of claim 12,
Wherein the specific gravity of the undercoat layer composition is from 1.01 to 1.03.
13. The method of claim 12,
The viscosity of the undercoat composition is 10 to 13 seconds at the time of exit from the Dean cup (# 4 Din 53211).
13. The method of claim 12,
Wherein the undercoat layer composition has a solid content of 18 to 23 wt%.
11. The method of claim 10,
Wherein the thickness of the undercoat layer is 1.0 to 1.5 占 퐉.
11. The method of claim 10,
Wherein the upper layer has a thickness of 4.0 to 6.0 占 퐉.

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