KR100513823B1 - Bio Paint Coating Composition And Precoated Metal Sheet Coated The Same - Google Patents

Abstract

It relates to a coating composition having antibacterial and far-infrared radiation as well as improved chemical resistance and glossiness, and a coated steel sheet coated with the coating composition. There is provided a coating composition and a coating steel sheet coated with a coating composition comprising 5 to 60 parts by weight of MgO powder and 0.2 to 5 parts by weight of a silane compound per 100 parts by weight of the thermosetting resin, the thermosetting resin. The antimicrobial, high-gloss, far-infrared radiation coated steel sheet coated with the coating composition and the coating composition is not only excellent in chemical resistance, but also has excellent dispersibility of MgO powder, thereby showing excellent antimicrobial activity and far-infrared radiation activity by addition of a small amount of MgO powder.

Description

Bio paint composition containing MgO powder and silane compound, and coated steel sheet coated with the coating composition {Bio Paint Coating Composition And Precoated Metal Sheet Coated The Same}

The present invention relates to a coating composition having antimicrobial and far infrared radiation, and a coated steel sheet coated with the coating composition. More specifically, the present invention relates to a coating composition having not only antibacterial and far-infrared radiation, but also improved chemical resistance and glossiness, and a coated steel sheet coated with the coating composition.

Far-infrared rays, which are beneficial to the human body, are a kind of electromagnetic waves that are slightly longer than visible light but have a very high frequency and are light energy in the range of 5-25 microns. Recently, as the efficacy on the human body is known, it has been used for various purposes ranging from far-infrared saunas to home appliances, building materials, and general household goods.

On the other hand, as a method for imparting antimicrobial properties to the steel sheet is disclosed that the inorganic antimicrobial agents such as Zn, Ag, etc. are contained in the zeolite carrier having far-infrared radiation of Korean Patent Application No. 1997-18446, but the antimicrobial metal ion is contained These carriers are very expensive and have limited application.

Accordingly, an object of the present invention is to provide a coating composition having excellent antimicrobial and far-infrared radiation as well as increased chemical resistance and gloss.

Another object of the present invention is to provide a coated steel sheet coated with the coating composition having excellent antimicrobial activity, far infrared radiation, chemical resistance and glossiness.

According to one aspect of the invention,

There is provided a coating composition comprising 5 to 60 parts by weight of MgO powder and 0.2 to 5 parts by weight of a silane compound per 100 parts by weight of the thermosetting resin, the thermosetting resin.

According to another aspect of the present invention,

Provided is a coated steel sheet coated with the coating composition according to the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

Alkali oxides, such as MgO powders, have excellent far-infrared radiation as well as antibacterial properties. However, when an excessive amount of MgO powder is used, the chemical resistance of the paint is low and the storage stability is lowered. In particular, due to poor chemical resistance, the surface is discolored when exposed to alkalis or acids, and blisters occur.

Therefore, the present invention solves the problem of magnesium oxide and can be applied to the paint, MgO powder and silane compound in a specific ratio to the coating composition generally used in steel sheet coating, when applied to the coated steel sheet, excellent antibacterial activity, A paint composition exhibiting far-infrared radiation, chemical resistance and glossiness, and a coated steel sheet coated with the paint composition are provided.

Thermosetting resin is a resin generally used for coating paints on steel sheets,

Although not limited thereto, polyester resins, silicone modified polyester resins, acrylic resins, and the like may be used.

MgO powder may be mixed with the thermosetting resin at 5 to 60 parts by weight per 100 parts by weight of the thermosetting resin. If the MgO powder is used in less than 5 parts by weight, the antimicrobial activity and far infrared radiation is low, when used in excess of 60 parts by weight, there is no significant effect on the improvement of the antimicrobial activity and far-infrared radiation, rather the chemical resistance is lowered, MgO powder in the resin This aggregates together and the dispersibility falls.

By combining the silane compound with the thermosetting resin and the MgO powder, the silane compound is coated on the surface of the MgO powder to improve the chemical resistance of the MgO powder and to suppress the agglomeration of the MgO powder to improve the dispersibility in coating production. As the dispersibility of the MgO powder is increased in this way, the antimicrobial activity and far-infrared radiation by a small amount of the MgO powder are also increased.

In addition, the silane compound remaining in the paint composition without reacting with the surface of the MgO powder forms a network structure of siloxane bonds with each other, improves glossiness in forming a coating film, and contributes to far-infrared radiation effect.

Examples of silane compounds that can be used include 3-aminopropyltriethoxy silane, 3-trimethoxysilylpropyl methacrylate, 3-aminopropyltrimethoxy silane, and the like.

The silane compound is used in an amount of 0.2 to 5 parts by weight per 100 parts by weight of the thermosetting resin. When used in less than 0.2 parts by weight is insufficient effect to suppress the aggregation phenomenon and chemical resistance by the silane compound. When it exceeds 5 parts by weight, a large amount of unreacted silane compound remains in the paint, and after coating on the steel sheet, the chemical resistance of the coating film may be lowered, and heat resistance may be lowered.

Furthermore, a dispersant generally added in preparing the coating composition for coating steel sheet coating,

Other additives such as leveling agents, thickeners or waxes may be added, if necessary, so that the total amount of other additives is 1.0 to 7.0 parts by weight based on 100 parts by weight of the thermosetting resin.

In order to show the hiding power of the coating film, a coloring pigment which is generally added in preparing a coating composition for coating a steel sheet may be added. The coloring pigment may be added in 10 to 80 parts by weight per 100 parts by weight of the thermosetting resin.

Other additives such as dispersing agents, leveling agents or thickeners, and specific materials used as coloring pigments and their contents are generally known in the art, and may be appropriately selected and used by those skilled in the manufacturing of paints. It does not specifically limit the kind and quantity of an additive and a pigment.

The solvent may be used in an amount suitable for thinner to adjust the viscosity, and this is also commonly used in the art and does not particularly limit its content.

The coating composition of the present invention first needs to uniformly disperse the MgO powder in the thermosetting resin and add a silane compound thereto to increase the bonding force between the resin and the MgO powder or to process the MgO powder.

That is, when the paint composition is prepared, other additives, coloring pigments, and silane compounds may be added at the same time, but the silane compound to be reacted with the MgO powder may be combined with other additives to reduce the effect of adding the silane compound.

Therefore, it is preferable to add the silane compound to the mixture of the thermosetting resin and the MgO powder first, to react with stirring, and then to add other additives, coloring pigments and the like. By reacting with stirring for about 30 minutes to 1 hour, the silane compound sufficiently reacts with the MgO powder. Thereafter, the other additives and coloring pigments are added as necessary to prepare a paint composition.

The coating composition according to the present invention is coated on a steel sheet to have a dry coating thickness of 5 to 25 microns to provide a coated steel sheet excellent in antimicrobial activity, far infrared radiation, chemical resistance and gloss. The paint composition is applied to the top of a conventional pre- and base-treated steel sheet. The thickness of the dry coating is general and is not limited thereto.

Precoated metal sheet according to the present invention has a storage and ripening effect of food, the growth effect of plants, the activation effect of water molecules and the like where the biological effects such as maintaining the freshness of food and promoting blood circulation Can be applied.

Hereinafter, the present invention will be described in detail through examples.

Example

The coating compositions of Comparative Examples 1 to 3 and Inventive Examples 1 to 6 were prepared by blending the polyethylester resin, MgO powder and silane compound shown in Table 1 in the amounts shown in Table 1. In Inventive Examples 1 to 6, the polyester resin and the MgO powder were first mixed, and then each silane compound was added and mixed.

Thereafter, 0.4 parts by weight of BYK-170 by BYK Chemie, 0.3 parts by weight of BYK-355 by BYK Chemie, 2 parts by weight of p-toluene sulfonic acid, 4 parts by weight of wax, and 30 parts by weight of titanium dioxide were added as a coloring pigment. Thinner was used as a solvent.

The coating compositions of Comparative Examples 1 to 3 and Inventive Examples 1 to 6 were coated with a dry coating thickness of 15 microns on a 20 x 10 cm steel sheet chromated and coated with epoxy resin at a dry film thickness of 4-5 microns. Each specimen was prepared by drying for 24 seconds at a steel plate temperature of ℃.

Using the specimens, the glossiness, far-infrared emissivity, antibacterial and chemical resistance of the coating were evaluated as follows.

Glossiness was measured by using a 60 ° glossmeter.

Far-infrared emissivity was measured in the wavelength range of 5 ~ 20㎛ of the coated steel sheet according to KS standard (KS L 2514, Section 6.4) of Korea Institute of Construction Materials Testing and Research Institute (FIR).

The antimicrobial properties were evaluated by pressure-adhesive method at Korea Institute of Construction Materials. Specifically, E. coli was inoculated into each specimen and incubated at 37 ° C. for 24 hours.

Chemical resistance was evaluated as the coating surface change by immersing each of the above specimens for 24 hours in 5% by weight H2SO4 and 5% by weight NaOH. The case where there was no blister on the surface of the coating film and there was little change in color was evaluated as good. The case where there was no blister on the surface of the coating film but the color change was severe was insufficient, and the case where the blister appeared severely on the surface of the coating film was evaluated as defective.

As can be seen from the results of Table 1, as the content of magnesium oxide to the polyester resin increases, there is no far-infrared emissivity synergistic effect, while the glossiness decreases. In addition, when a large amount of MgO powder is added, chemical resistance is a problem (Comparative Examples 1 to 3). However, in the case of Inventive Examples 1 to 6 to which the silane compound was added, excellent far-infrared radiation activity, surface gloss of paint surface, chemical resistance and antibacterial property were exhibited.

The coating composition of the present invention blended with MgO powder and silane compound, and the antimicrobial and high gloss far-infrared radiation coated steel sheet coated with the coating composition not only have excellent chemical resistance, but also increase the dispersibility of the MgO powder, thereby adding a small amount of MgO powder. Also shows excellent antimicrobial activity and far-infrared radiation activity.

Claims (4)

 A coating composition comprising 100 parts by weight of thermosetting resin, 5 to 60 parts by weight of MgO powder and 0.2 to 5 parts by weight of silane compound. The coating composition according to claim 1, wherein the thermosetting resin is selected from the group consisting of a polyester resin, a silicone-modified polyester resin, and an acrylic resin. The coating composition according to claim 1, wherein the silane compound is selected from the group consisting of 3-aminopropyltriethoxy silane, 3-trimethoxysilylpropyl methacrylate and 3-aminopropyltrimethoxy silane. .  The coated steel sheet coated with the coating composition of any one of claims 1 to 3.