KR20060110608A - Anti-bacterial liquid composition for coating and anti-bacterial paint composition including the same - Google Patents

Abstract

Provided is an anti-bacterial liquid coating composition for an eco-friendly paint composition, which has excellent water resistance, weather resistance, anti-fouling property and mechanical strength, and contains no VOC. The anti-bacterial liquid coating composition comprises: 30-40 wt% of a metal silicate; 1-3 wt% of a siloxane-based surfactant; 0.5-2 wt% of nanosilver; 3-7 wt% of at least one additive selected from the group consisting of triethyl silane and acetic acid; and the balance amount of water. In the anti-bacterial liquid coating composition, the silicate is surface-modified with aluminum ions. The paint composition comprises the anti-bacterial liquid coating composition and a natural pigment.

Description

Anti-bacterial liquid composition for coating and anti-bacterial paint composition including the same}

 The present invention relates to an antimicrobial coating solution composition and an antimicrobial coating composition comprising the same. More specifically, the present invention relates to an environmentally friendly antimicrobial coating liquid composition and an antimicrobial coating composition including the same, having excellent physical properties such as water resistance, weather resistance, fouling resistance, antimicrobial activity, mechanical strength, and no volatile organic compound (VOC).

In general, the coating composition is made of a resin made in petrochemicals with chemicals as the main raw material. The paints thus produced are harmful to humans and the environment by releasing huge amounts of hazardous chemicals that are invisible during manufacturing and consumption. Due to the environmental damage caused by these hazards and the impact on the human body, the world is accelerating the production of environmentally friendly paints. However, the performance is limited due to various problems compared to the performance of paints using resins made by organic chemical methods. Is showing.

Recently, eco-friendly paints such as natural paints using vegetable resins or mineral resins have been developed, but paints using vegetable resins have fatal defects such as discoloration due to ultraviolet rays, and problems with water resistance, such as natural paints using the mineral resins, also occur. There is a problem in using it as a general paint because it does not solve the problem.

The present invention has been made in view of the problems of the prior art as described above, and provides an antimicrobial coating liquid composition having excellent physical properties such as water resistance, weather resistance, fouling resistance, antimicrobial activity, mechanical strength, and no volatile organic compound (VOC).

In another aspect, the present invention provides an antimicrobial coating composition comprising the antimicrobial coating solution composition.

Antimicrobial coating liquid composition according to an aspect of the present invention comprises 30 to 40% by weight of silicate metal salt, 1 to 3% by weight of siloxane-based surfactant, 0.5 to 2% by weight of nano silver, from the group consisting of triethyl silane and acetic acid 3 to 7% by weight of at least one additive selected and excess water.

Coating composition according to an aspect of the present invention comprises 30 to 40% by weight of silicate metal salt, 1 to 3% by weight of siloxane-based surfactant, 0.5 to 2% by weight of nano silver, selected from the group consisting of triethyl silane and acetic acid Antimicrobial coating liquid compositions comprising at least 3 to 7% by weight of at least one additive and excess water, and natural pigments.

The coating liquid composition and the coating composition are excellent in physical properties such as water resistance, weather resistance, fouling resistance, antibacterial property, mechanical strength, and do not contain VOC, thereby being environmentally friendly.

Hereinafter, the present invention will be described in detail.

Antimicrobial Coating Liquid Composition

The antimicrobial coating liquid composition includes silicate metal salts, siloxane based surfactants, nanosilver and other additives.

The silicates have an average particle diameter of 5-20 nm. Preferably it has an average particle diameter of 7-14 nm.

The silicate also has a specific surface area of 700 to 1200 m 2 / g. In addition, as the silicate, it is preferable to use a cationic silicate whose surface is modified with aluminum ions. The silicate is

The silicate metal salt comprises 30 to 40% by weight in the total composition.

As the silicate metal salt, sodium silicate, lithium silicate, potassium silicate, silicate silicate, and the like are used, and silicate silicate is preferably used.

The silicic acid silicate according to one feature of the invention is prepared as follows. After the ratio of silicon dioxide and sodium oxide was adjusted to pH 9 to 10 by ion exchange with KS 3 sodium silicate using acidic ion exchange resin, inorganic salts such as sodium sulfate, for example, sodium sulfate, Sodium chloride or the like is used to induce gelation, and the silicate silicate having a concentration of 5 to 15% and an average particle size of 5 to 20 is prepared through a stabilization step at room temperature.

The prepared silicate silicate is preferably used to surface-modify the aluminate soda solution at 25 to 50 ℃ to the silicate silicate.

In general, the silicate silicate has a surface area of 300 to 500 m 2 / g, but since the silicate silicate used in the present invention has a two-dimensional or three-dimensional network structure, the specific surface area at the same mass is about 2 to 2.5 times that of the common silicate. 1000 to 1200 m 2 / g. This increase in specific surface area has an anionic charge density of 2 to 2.5 times the binding force, so that the charge neutralization / reversal ability is increased to have an effective coupling effect.

As the siloxane-based surfactant, nonionic surfactants such as dimethyl polysiloxane are used.

As a silver compound for producing the nano-silver, yellowed silver is used, which can be obtained by a known method (interface with chemical steel and colloid P319-340, 1997). In the preparation method, first, 70 g of sodium citrate and 38 g of ferrous sulfate are dissolved in 300 mg of distilled water. Thereafter, 100 ml of silver nitrate, in which 12.5 g of silver nitrate solution was dissolved, was added to the sodium sulfate solution at a stirring rate of 1000-5000 rpm under a temperature of about 10-50 ° C. in distilled water to make fine particles. At this time, the silver particles produced had a particle size distribution of 5-10 g / cm 2, which was placed in a centrifuge and recovered silver particles so that the silver solids concentration was 1-70% by weight. Silver is obtained.

In addition, as another method for preparing a silver compound, electrolysis may be used. In this way, high-purity nanonized silver can be obtained, and pure silver (99.9%) is added to distilled water to generate a low current so that the discharged silver particles are dissolved in the solution.

Antimicrobial Paint Composition

The antimicrobial paint composition according to the present invention is prepared by adding a natural pigment to the antimicrobial coating solution composition described above.

The natural pigment may be any natural pigment that can be used in the coating composition.

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

Example 1 Preparation of Silicate Silicate

Silicon oxide (SiO ₂ ) and sodium oxide (Na ₂ O) were adjusted to pH 9 with a strong acidic ion exchange resin, and then 2.2296g of sodium sulfate aqueous solution was added to 100 g of silica-containing water glass solution as a gelling accelerator. After stirring at 1000 rpm for 20 minutes, the solution was subjected to stabilization at room temperature to prepare a silicate silicate having an average particle diameter of 12 nm.

Example 2 Surface Modification of Silicate Silicates

In order to surface-modify the silicate silicate surface prepared in Example 1 with aluminum ions (Al ³⁺ ), 5 g of alumina soda solution was slowly added at 50 ° C. for 15 minutes to surface modification to 100 g of silica-containing water glass solution, followed by 15 minutes. The solution stirred at 300 rpm was subjected to stabilization at room temperature to prepare a surface-modified silicate silicate.

Preparation of Antimicrobial Coating Liquid Composition

Example 3

To the surface-modified silicate silicate 1000g prepared in Example 2 as an additive, 105g of triethylsilane and 5g of acetic acid were mixed and stirred for about 1 hour at a speed of about 1000rpm. Subsequently, 10 g of nano silver was added thereto, followed by stirring at a rate of about 750 rpm to prepare an antimicrobial coating solution.

Example 4

1000 g of the surface-modified silicate silicate prepared in Example 2 as an additive was mixed with 132 g of triethylsilane and 8 g of acetic acid, and then stirred at a speed of about 1000 rpm for about 1 hour. Subsequently, 10 g of nano silver was added thereto, followed by stirring at a rate of about 750 rpm to prepare an antimicrobial coating solution.

Preparation of Antimicrobial Natural Coating Compositions

Preparation Example 1

500 g of natural pigment was added to the antimicrobial coating solution composition prepared in Example 3 to prepare an antimicrobial natural paint composition.

Preparation Example 2

500 g of natural pigment was added to the antimicrobial coating solution composition prepared in Example 4 to prepare an antimicrobial natural paint composition.

Comparative Example 1

500 g of an acrylic resin was additionally added to Preparation Example 1, and then a comparative coating composition was prepared.

Comparative Example 2

Comparative coating compositions were prepared in the same manner as in the antimicrobial natural coating compositions of Preparation Example 1, except that the additives were prepared in Preparation Example 1.

Comparative Example 3

A comparative coating composition was prepared in the same manner as in the antimicrobial natural coating composition of Preparation Example 1, except that nanosilver was not used in Preparation Example 1.

Comparative Example 4

Comparative coating compositions were prepared in the same manner as in the antimicrobial natural coating compositions of Preparation Example 1, except that the additives were prepared in Preparation Example 1.

Experimental Example 1

The coating compositions prepared in Preparation Examples 1 and 2 and Comparative Examples 1 to 4 were evaluated for water resistance, weather resistance, durability, workability, antibacterial and bactericidal properties, and VOC discharge. Evaluation results are shown in Table 1 below.

Yes Water resistance Weather resistance durability Workability Antibacterial / Sterile (Bacterial Growth) VOC emissions Preparation Example 1 good good good good -10.5% none Preparation Example 2 good good good good -10.0 none Comparative Example 1 Bad good good good -8.5% much Comparative Example 2 Bad Bad Bad Bad -8.5% none Comparative Example 3 good good good good + 10% none Comparative Example 4 Bad good good good -8.5% none

In order to test the antimicrobial / bactericidal, the amount of increase compared to the initial bacterial count 10 minutes after the application of Staphylococcus and E. coli as a test strain to the coating composition was measured.

The antimicrobial coating liquid composition of the present invention has excellent physical properties such as water resistance, weather resistance, and antimicrobial properties, and the antimicrobial coating composition prepared using the same does not contain volatile organic compounds, and thus does not emit VOC at all. great.

As described above, although described with reference to the preferred embodiment of the present invention, those skilled in the art will be variously modified without departing from the spirit and scope of the invention described in the claims below. And can be changed.

Claims (4)

3 to 7% by weight of at least one additive selected from the group consisting of 30 to 40% by weight of silicate metal salt, 1 to 3% by weight of siloxane-based surfactant, 0.5 to 2% by weight of nano silver, and triethyl silane and acetic acid And an antimicrobial coating liquid composition comprising excess water. The coating solution composition of claim 1, wherein the silicate is modified with aluminum ions. The coating solution composition of claim 1, wherein the silicate has an average particle diameter of 5 to 20 nm and a specific surface area of 700 to 1200 m 2 / g. 3 to 7% by weight of at least one additive selected from the group consisting of 30 to 40% by weight of silicate metal salt, 1 to 3% by weight of siloxane-based surfactant, 0.5 to 2% by weight of nano silver, and triethyl silane and acetic acid And an antimicrobial coating liquid composition comprising excess water; And Coating composition comprising a natural pigment.