JP3174494B2 - Antibacterial paint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solvent-borne baking coating to which a dissolving glass having an antibacterial property is added to impart an antibacterial property.

[0002]

2. Description of the Related Art In recent years, the tendency to pay attention to cleanliness in everyday life has increased, and there has been an increasing demand for antibacterial paints for preventing the occurrence of mold on walls and floors of houses.
Such antibacterial paints include those containing organic and inorganic antibacterial agents, but the selection criteria for antibacterial agents are safe for humans and no environmental pollution to the earth.
Works on many bacteria, prevents growth against many bacteria,
These include durability of antibacterial effect, discoloration resistance, heat resistance, acid resistance and alkali resistance, etc., but there is a tendency that paints added with inorganic antibacterial agents are selected to satisfy these criteria comprehensively. It is growing.

[0003] As a typical paint to which an inorganic antibacterial agent is added, a metal such as silver or copper exhibiting an antibacterial effect is used, and an antibacterial agent supported on zeolite, ceramic, silica gel or the like is used. There is.

However, since these antibacterial paints are non-eluting antibacterial agents, their antibacterial effect is large depending on how highly dispersed the inorganic antibacterial agents are exposed on the coating surface when added to the paint. There was a problem of lack of stability and sustainability. There is also a problem that the coating film is significantly discolored by the contained silver. Accordingly, the applicant has disclosed in Japanese Patent Application Laid-Open No.
No. 938 discloses a zinc borate-based soluble glass, but there is a problem that when mixed with a paint, the properties of the paint film are deteriorated.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an antibacterial property by adding a silver-containing soluble glass to a paint and eluting silver ions with water penetrating the paint film. It is not necessary to highly disperse and expose the antibacterial agent, and there is no adverse effect on the physical properties of the coating film. An antibacterial paint having good alkali resistance is provided.

[0006]

Means for Solving the Problems] Antimicrobial coatings of the present invention has been made to solve the aforementioned problem, P ₂ O _5: 45~75m
ol%, MgO: 35~55mol%, Al 2 O 3: 5~20
0.1% to 5% by weight of Ag ₂ O with respect to the composition consisting of
Al particle size 30μm or less of soluble glass powder containing
Kid resin paint, amino alkyd resin paint, epoxy resin
Paint, polyester resin paint, acrylic resin paint, vinyl
And 0.5 to 2% by weight in one kind of paint selected from resin paints .

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The soluble glass to be added to the antibacterial paint of the present invention contains 45 to 75 mol% of P ₂ O ₅ and 35 of MgO.
~55mol%, and preferably in the range of Al ₂ O ₃ of 5 to 20 mol%, the Ag ₂ O with respect to these compositions 0.
It contains 1 to 5% by weight. Here, the reason for limiting the composition of the melting glass is as follows. First P ₂
When O ₅ is at most 45 mol%, it will make the melting of the glass difficult and increase the devitrification tendency of the glass.
% Or more, P ₂ O ₅ volatilizes at the time of melting, causing a lot of volatility of the composition, causing discoloration to yellow-brown when added to the paint, and increasing the hygroscopicity to obtain a desirable melting glass. It is because it does not become.

Next, if MgO is 35 mol% or less, it is necessary to use a large amount of P ₂ O ₅ and 75 mol% of P ₂ O ₅
This is because the same problem as that described above occurs, and when the content is 55 mol% or more, the same problem occurs as when P ₂ O ₅ is 45 mol% or more.

When the content of Al ₂ O ₃ is less than 5 mol%, it is difficult to control the melting rate of the formed soluble glass, and the discoloration tendency of the coating film is increased. When the content is more than 20 mol%, the solubility becomes poor. The reason for this is that the discoloration tendency is large when it is added.

Then, Ag ₂ O to be added to the melting glass is added to 0.1 g.
The reason why the content is set to 1 to 5% by weight is that if the content is less than 0.1% by weight, it is not economical because it is necessary to add a large amount of soluble glass in order to sufficiently exert the antibacterial effect on the paint, and it is not economical. Conversely, if the content is more than 5% by weight, metallic silver precipitates at the time of melting of the melting glass, causing local erosion of the refractory. It causes discoloration. And if it is more than this, the antibacterial effect is not improved and it is not economical.

The reason why the particle size of the silver-containing soluble glass to be added to the antibacterial coating of the present invention is 30 μm or less is that the thickness of a general coating film is 30 μm or more and does not affect the state of the coating surface. This is to control the solubility of the melting glass and the elution of silver ions accompanying the melting. Preferably, the particle size is 10 μm or less.
For an extremely thin coating film, a particle size smaller than the thickness of the coating film is appropriately selected. Then, the addition amount of the soluble glass powder is set to 0.
The reason for setting the content to 5 to 2% by weight is to exhibit an effective and appropriate antibacterial effect without affecting the physical properties of the paint and its coating film, and to consider economical efficiency.

The antibacterial paints formed by adding the above-mentioned soluble glass include alkyd resin paints, amino alkyd resin paints, epoxy resin paints, polyester resin paints, and the like.
Solvent-type baking paint such as acrylic resin paint and vinyl resin paint.

[0013]

【Example】

(Example 1) A silver-containing phosphoric acid-soluble glass was prepared by a known method so as to have a composition shown in Table 1, and pulverized. , 1.5% and stirred for 30 minutes to obtain the antibacterial paint of the present invention. And spray the antibacterial paint to JIS G 3141 cold thick rolled steel sheet (with zinc phosphate treatment)
And baked at 160 ° C. for 20 minutes to form a 30 μm coating film, and an antibacterial test was performed. The antibacterial test was performed on Escherichia coli and Staphylococcus aureus by the surface wrap method (1/50 NB after 24 hours at 35 ° C.), and the results in Table 2 were obtained. As a comparative example, the same antibacterial test was performed on zinc borate-based antibacterial molten glass and silver-containing zeolite.

[0014]

[Table 1]

[0015]

[Table 2]

(Example 2) Regarding the physical properties of the paint film of the paint of the present invention, the thermosetting acrylic resin paint was 0.5%
After adding 1.5% and stirring for 30 minutes, spray with JI
SG 3141 was applied to a cold-rolled thick steel plate (with zinc phosphate treatment) and baked at 160 ° C. for 20 minutes to form a 30 μm paint film. The characteristics were investigated and the results shown in Table 3 were obtained.

[0017]

[Table 3]

[0018]

The antibacterial paint of the present invention has excellent dispersibility of the antibacterial agent in the paint, as shown by the results of the above examples, and is almost equivalent to the paint containing the conventional zeolite-based antibacterial agent (Comparative Example 2). The antibacterial effect is exhibited, and the discoloration of the coating film after immersion in alkali resistance is very slight, there is no abnormality of peeling or blistering, and it has a function of improving alkali resistance. Further, it was confirmed that the peeling was small even in the salt spray spray, and that the compound exhibited overall superior physical properties to the comparative example.

The antibacterial paint of the present invention exhibits an antibacterial effect by dissolving the soluble glass added by the moisture penetrating into the coating film and eluting the contained silver ions to exhibit an antibacterial effect. It is not necessary to focus on how to highly disperse the melting glass and how to expose the melting glass, and it is sufficient to have ordinary dispersibility. The soluble glass to be added has a composition similar to that of the phosphoric acid-based inorganic pigment, and the phosphoric acid-based inorganic pigment is used as a paint additive for various purposes to adversely affect the physical properties of the paint film. However, it was confirmed that the present invention was the same in Example 2 described above. Furthermore, the dissolving glass added to the paint in the present invention is an antibacterial agent for preventing discoloration of the resin composite, so that discoloration of the coating film is extremely small.

On the other hand, the paint to which the zinc borate-based soluble glass (Comparative Example 1) was added had the same excellent results in terms of dispersibility, hardness and adhesiveness immediately after the formation of the coating film. -The coating film of the present invention showed good results without any problem, while the coating film of the present invention showed remarkable generation of blisters and blisters in the properties of boiling water, heat resistance and salt water spray. This is because, in a steel sheet subjected to zinc phosphate treatment, phosphoric acid in the paint of the present invention reacts with the underlying iron surface after penetrating the pinholes of the zinc phosphate coating to form an adhesive conversion coating. To passivate the metal surface, and it is considered that the same effect is exhibited for the chromate-treated steel sheet.

[0021]

As described above, the antibacterial paint of the present invention has the same antibacterial effect as the conventional antibacterial effect, but has a stable and long-lasting effect, little discoloration of the coating film, heat resistance,
It has excellent acid and alkali resistance. In addition, since inorganic soluble glass is added, it goes without saying that it is safe for humans and does not pollute the global environment. Therefore, the antibacterial paint of the present invention solves the conventional problems,
There is a great deal of contribution to industrial development as a significant improvement.

Claims (1)

(57) [Claims] 1. P ₂ O ₅ : 45 to 75 mol%, MgO: 35
To 55 mol% and Al ₂ O ₃ : 5 to 20 mol%, and a particle size of 30 containing 0.1 to 5% by weight of Ag ₂ O.
0.5 to 2% by weight of soluble glass powder
Kid resin paint, amino alkyd resin paint, epoxy resin
Paint, polyester resin paint, acrylic resin paint, vinyl
An antibacterial paint characterized in that it is added to one kind of paint selected from resin paints.