JPH11236734A - Antibacterial building material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antibacterial building material having excellent workability in a painting process and having uniform superior antibacterial properties extending over the whole surface. SOLUTION: The antibacterial building material is used as a building material for interior finishing such as a floor material, a wall material, a ceiling material, etc., and the surface of the antibacterial building material is coated with an antibacterial ultraviolet curing type coating composition, to which 0.1-20 wt.% amino acid salt of an antibacterial metal at a weight ratio to the solid content of an ultraviolet curing type coating composition is added and mixed while using the ultraviolet curing type coating composition mainly comprising an ultraviolet cured resin as a base. Since the coating composition has viscosity lower than conventional antibacterial paints, workability in a painting process is improved and the dispersing quality of an antibacterial component is enhanced, the surface of the building material has uniform excellent antibacterial properties extending over the whole surface. Since the loading of amino acid salt is prepared in 0.1-20 wt.%, the color of the surface is not changed by ultraviolet rays.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an antibacterial building material.

[0002]

2. Description of the Related Art Conventionally, as an antibacterial building material, for example, JP-A-7-164409 or JP-A-8-3
The thing described in 18505 is known. These building materials are wooden building materials to which antibacterial properties are imparted by coating the surfaces with antibacterial paints, and can be used as interior building materials such as flooring materials, wall materials, and ceiling materials.

[0003]

The above-mentioned Japanese Patent Application Laid-Open No. Hei 7-164409 discloses, as antibacterial paints, metals having high antibacterial properties such as silver, copper, and zinc (hereinafter collectively referred to as antibacterial metals). ) Is added and mixed with a base paint to add and mix ions of synthetic zeolite.

However, building materials coated with such an antibacterial paint have poor dispersibility of zeolite fine particles as an antibacterial agent, and the antibacterial agent tends to be unevenly distributed in the coating film. However, there is a drawback that the antibacterial property may not be provided. Also, it is possible to add a large amount of the antibacterial agent in anticipation of the uneven distribution of the antibacterial agent, but in this case, the strength of the coating film is insufficient, and for example, the durability required for the floor material cannot be secured. In addition, there have been some unfavorable problems such that the productivity of building materials deteriorates as much as the workability of the coating process deteriorates as the viscosity of the paint increases.

On the other hand, JP-A-8-318505 describes a paste-like paint containing a silver-based inorganic antibacterial agent in which a silver complex is adhered or adsorbed to ceramics, as an antibacterial paint. In the case of this antibacterial paint, the dispersibility of the antibacterial agent is improved by making the base paint into a paste.

However, making the paint paste-like is equivalent to increasing the viscosity of the paint irrespective of the amount of the antibacterial agent to be added. However, there is a drawback that the point that the productivity of building materials is deteriorated is not improved by the amount of deterioration.

[0007] The present invention has been made to solve the above problems, and an object of the present invention is to provide an antibacterial building material which has good workability in a coating process and is uniform and has good antibacterial properties over the entire surface. Is to provide.

[0008]

Means for Solving the Problems and Effects of the Invention In order to achieve the above-mentioned object, the present inventors first studied various antibacterial components. As a result, it has been found that, when a certain antibacterial component is added to the coating composition and coating is performed, workability in the coating process is good, and uniform and good antibacterial properties can be imparted over the entire surface of the building material. Was. However, it was also found that the antibacterial coating film sometimes discolored on the surface of the building material when exposed to ultraviolet light. Therefore, the inventors further studied means for preventing the discoloration, and found that the discoloration can be effectively prevented by adjusting the composition ratio between the base coating composition and the antibacterial component. It was completed.

That is, the antibacterial building material of the present invention has a weight ratio to the solid content of the base coating composition of 0.2 × 10 ^-2 to 40 as described in the above-mentioned claim 1.
The surface is coated with an antibacterial coating composition obtained by adding × 10 ^-2 % by weight of an antibacterial metal amino acid salt to the coating composition.

In the present invention, the material and the shape of the base material portion serving as a building material are not particularly limited, and various wooden building materials, metal building materials, resin building materials, ceramic building materials, or other composite material-based materials are used. Building materials can be considered. The antibacterial coating composition used to form a coating film on the surface of the substrate portion contains a base coating composition and an amino acid salt of an antibacterial metal.

As the base coating composition, various synthetic resins and their precursors known as paint components can be used. For example, urethane paint, acrylic paint,
Lacquer paints, fluororesin paints, silicone resin paints, emulsion-based aqueous paints and the like can be used.

As the antibacterial metal forming the amino acid salt, various metals having antibacterial properties, specifically, silver, copper,
Zinc and the like can be suitably used. As the amino acid forming the amino acid salt, an N-long chain acyl amino acid can be used. An N-long-chain acyl amino acid is an amino acid having a long-chain acyl group (fatty acid residue) at the N-position. As the long-chain acyl group, a higher fatty acid residue is preferable, and for example, a decanoyl group, a lauroyl group, a myristoyl group, a palmitoyl group, a stearoyl group, an oleoyl group and the like are preferable. Further, the acyl group is not limited to a single group,
A plurality of types of the above acyl groups may be used. The amino acid portion may be any of monoaminomonocarboxylic acid, monoaminodicarboxylic acid, and diaminomonocarboxylic acid. Among these, monoaminodicarboxylic acid is desirable in that it has two carboxyl groups, so that a metal having an antibacterial action is easily bonded and the antibacterial action can be made strong as a whole.

Specific examples of amino acids include monoaminomonocarboxylic acids such as glycine, alanine, valine,
Leucine, phenylalanine, tyrosine, threonine,
Tryptophan, methionine, and the like. Monoaminodicarboxylic acids include aspartic acid and glutamic acid, and diaminomonocarboxylic acids include lysine, arginine, and histidine. Then, the N-long-chain acylamino acid is not limited to one kind, and many kinds may be used.

From the above, preferred specific examples of the amino acid salt used in the present invention include copper N-stearoyl glutamate, copper N-lauroyl glutamate, copper N-myristoyl glutamate, copper N-stearoyl aspartate, and N-lauroyl asparagine. Copper acid, copper N-myristoyl aspartate, silver N-stearoyl glutamate, silver N-lauroyl glutamate, silver N-myristoyl glutamate, silver N-stearoyl aspartate,
Silver N-lauroyl aspartate, silver N-myristoyl aspartate, silver N-stearoyl valine, silver N-lauroyl valine, silver N-myristoyl valine, copper N-stearoyl valine, copper N-lauroyl valine, copper N-myristoyl valine, N-stearoyl phenylalanine silver, N-lauroyl phenylalanine silver, N-myristoyl phenylalanine silver, N-stearoyl phenylalanine copper, N-lauroyl phenylalanine copper, N-myristoyl phenylalanine copper, N-stearoyl arginine silver, N-lauroyl arginine silver, N- Myristoyl arginine silver, N-stearoyl arginine copper, N
-Copper lauroyl arginine, copper N-myristoyl arginine, zinc N-stearoyl glutamate, zinc N-lauroyl glutamate, zinc N-myristoyl glutamate, zinc N-stearoyl aspartate, zinc N-lauroyl aspartate, zinc N-myristoyl aspartate, Zinc N-stearoyl valine, zinc N-lauroyl valine, zinc N-myristoyl valine, zinc N-stearoyl valine, zinc N-lauroyl valine, N
Zinc stearoylphenylalanine, zinc N-lauroylphenylalanine, zinc N-myristoylphenylalanine, zinc N-stearoylarginine, zinc N-lauroylarginine, zinc zinc N-myristoylarginine, and the like.

It is desirable that these amino acid salts are previously dispersed in an appropriate dispersion medium to form a sol composition. For the sol composition mainly containing such an antibacterial metal amino acid salt, the production method is not particularly limited,
The sol composition containing the amino acid salt of an antibacterial metal as a main component is already commercially available as an antibacterial agent (for example, trade name: ALCO; manufactured by Nikko Co., Ltd.). May be.

Further, the above antibacterial coating composition is
When preparing, the base coating composition
Weight ratio of 0.2 × 10^-2~ 40x
10 ^-2By weight of the antimicrobial metal amino acid salt
It is important to add to the printing composition. That is,
The weight ratio of the amino acid salt is 0.2 × 10^-2Below weight%
It is difficult to ensure sufficient antibacterial properties,
On the other hand, when the weight ratio of the amino acid salt is 40 × 10^-2Weight%
Above this, the building materials become exposed to the surface when exposed to UV light.
Because of the risk of discoloration, the weight ratio of the amino acid salt
0.2 × 10^-2~ 40 × 10^-2Weight%
More necessary antibacterial properties and prevention of discoloration
Can be. In addition, the weight ratio of the amino acid salt is set in the above numerical range.
If it is prepared within the enclosure, it will usually cause substantial adverse effects.
No discoloration is recognized, but white or light-colored building materials
If even slight discoloration cannot be tolerated, amino
The weight ratio of the acid salt is preferably controlled to 5% by weight or less. This
Such building materials have almost no surface discoloration.
You.

The thickness of the coating layer is arbitrary, but is usually about 50 to 100 μm.
Incidentally, since the weight ratio is based on the weight of the solid content of the amino acid salt of the antibacterial metal, for example, a two-phase mixture obtained by dispersing the amino acid salt of the antibacterial metal in an appropriate dispersion medium is used as a base coating composition. When added to the two-phase mixture, the amount of the two-phase mixture is determined so that the weight ratio of the solid content in the coating composition to the solid content in the two-phase mixture falls within the above numerical range. do it.

According to the antibacterial building material constructed as described above, the workability in the coating process is good, so that the productivity is high and the antibacterial building material can be provided at a lower cost than before. In addition, uneven distribution of antibacterial components in the coating film is unlikely to occur, and it is possible to ensure uniform and good antibacterial properties over the entire surface of the building material, so when used as floor material, wall material, ceiling material, etc. Propagation of various bacteria on floors, walls, and ceilings can be completely suppressed. Furthermore, since the amount of the amino acid salt of the antibacterial metal has been optimized,
The required antibacterial property can be ensured and discoloration can be prevented at the same time.

By the way, as a top coat such as a floor material, an ultraviolet curable paint has been conventionally used from the viewpoint of a balance between a functional aspect such as strength and productivity. And
After a coating process using an ultraviolet curable paint, a process of irradiating the coating film with ultraviolet rays to cure the coating film is performed. In such a curing treatment, irradiation of ultraviolet rays is essential.

However, even in such a case, the base
The composition ratio between the coating composition and the antimicrobial component
This can prevent discoloration due to ultraviolet rays.
won. That is, the antibacterial building material according to claim 2
As described above, when the base coating composition is ultraviolet
UV-curable coating group mainly composed of radiation-curable resin
The solid of the ultraviolet-curable coating composition
0.2 × 10 ^-2~ 40 × 10^-2Heavy
% Of the antimicrobial metal amino acid salt in the ultraviolet curing
UV Curing Added to Mold Coating Composition
The surface is coated by the mold coating composition.
If it is an antibacterial building material characterized by being
Despite being exposed to ultraviolet light during the chemical treatment,
Discoloration that causes substantial adverse effects is not recognized
Become.

Examples of such an ultraviolet curable resin include a modified acrylic resin, a modified urethane resin, an acrylic resin, a polyester resin and the like. In particular, when the ultraviolet-curable resin is an acrylic polyester resin as in the antibacterial building material according to claim 3, it has sufficient strength as a topcoat for flooring materials, and also has an amino acid salt of an antibacterial metal. This is particularly desirable because it has good compatibility with, and can uniformly mix the two.

[0022]

Next, an embodiment of the present invention will be described with reference to an example. (1) Evaluation of influence by ultraviolet irradiation Commercially available ultraviolet-curable acrylic polyester resin paint (trade name: Hikari Flat 6A-011LV; solid content:
99% by weight; color: transparent and colorless;
A commercially available antimicrobial agent (trade name: ALCO; solid content: 2% by weight; manufactured by Nikko Corporation) containing an antimicrobial metal amino acid salt as an active ingredient was added and mixed to obtain an antimicrobial coating composition. Nine kinds of antibacterial agents were prepared by changing the weight ratio between the solid content of the base paint and the solid content of the antibacterial agent.

The nine coating compositions were applied to a white plate using a flow coater to form a coating having a thickness of about 80 μm, and the coating was cured by irradiation with ultraviolet rays. The cured coating film is visually observed. If no discoloration is observed, “◎” indicates that slight discoloration is observed, but if it does not impair the commercial value, “○” indicates that the commercial value is affected. The case where a slight degree of discoloration was recognized was rated "△", and the case where the commercial value was likely to be impaired was marked "x".
The results are shown in Table 1 below.

[0024]

[Table 1]

From the above results, it was found that the amount of the antibacterial agent added was 40
It can be seen that if the content is less than × 10 ^-2 % by weight, a building material having sufficient commercial value can be obtained. In particular, in this experiment,
It uses a white plate material with the most noticeable discoloration as a base material,
If the base material is darker, the discoloration is considered to be less noticeable. Therefore, the amount of the antibacterial agent to be added is 40 × 10 ⁻² wt%.
In the following, it is considered that there is no adverse effect due to discoloration of the base material of any color. (2) Antibacterial activity test Next, regarding the above-mentioned Samples 1 to 6, Staphylococcus aureus,
And the antibacterial activity against Escherichia coli was confirmed. The test procedure is
First, water containing each bacterium was dropped on the surface of the coating film of each of the samples 1 to 6, and was covered with a plastic film. Thereafter, each sample was stored in a thermostatic chamber for one day. Then, the water on the paint was collected and cultured, and the number of bacteria in the culture solution was counted.
In addition, the number of bacteria was diluted by 10-fold amount until it became possible to count, and the value obtained by multiplying the counted value by the dilution factor was defined as the number of bacteria.

Table 2 shows the change in the number of Staphylococcus aureus, and Table 3 shows the change in the number of E. coli.

[0027]

[Table 2]

[0028]

[Table 3]

From the above results, when preparing the antimicrobial coating composition, the antimicrobial metal amino acid of 0.2 × 10 ⁻² % by weight or more by weight based on the solid content of the base coating composition was used. It turns out that sufficient antibacterial property can be secured by adding a salt. As is clear from the above description, according to the antibacterial building material coated with the antibacterial coating composition, the workability in the coating process is better than the conventional product coated with a high-viscosity antibacterial paint, High productivity and antibacterial building materials can be provided at low cost.

Further, since an amino acid salt of an antibacterial metal is selected as the antibacterial component, uneven distribution of the antibacterial component in the coating film is unlikely to occur, and uniform and good antibacterial properties can be ensured over the entire surface of the building material. it can. Therefore, when used as a floor material, a wall material, a ceiling material, and the like, it is possible to completely suppress the propagation of various bacteria on the floor, wall, and ceiling.

Particularly, since the amount of the amino acid salt of the antibacterial metal is adjusted within the range of 0.2 × 10 ^-2 % by weight to 40 × 10 ^-2 % by weight, it is possible to ensure necessary antibacterial properties. It is possible to achieve compatibility with prevention of discoloration due to ultraviolet rays. that's all,
Although the embodiment of the present invention has been described, various specific embodiments other than those described above can be considered for the embodiment of the present invention.

For example, in the above embodiment, an antibacterial building material whose surface is coated with an antibacterial ultraviolet curable coating composition has been described as an example, and it has been described that discoloration does not occur even when irradiated with ultraviolet rays. However, the present invention can be applied to an antibacterial building material coated with a coating composition containing a component other than an ultraviolet curable resin as a main component. Even in this case, the workability in the coating process is good, and the effect of ensuring sufficient and uniform antibacterial properties is the same. Also, since discoloration due to ultraviolet rays is prevented, ultraviolet rays are irradiated for curing treatment. Although not performed, there is an effect that discoloration of the surface can be prevented even when exposed to sunlight during daily use.

Claims (3)

[Claims] 1. An antimicrobial metal amino acid salt in an amount of 0.2 × 10 ^-2 to 40 × 10 ^-2 % by weight relative to the solid content of a base coating composition is added to the coating composition. An antibacterial building material, the surface of which is coated with an antibacterial coating composition comprising: 2. The antibacterial building material according to claim 1,
The base coating composition is an ultraviolet-curable resin;
UV-curable coating composition containing fat as a main component.
Weight of the ultraviolet curable coating composition with respect to the solid content.
0.2 × 10 ^-2~ 40 × 10^-2% By weight of the anti
The fungal metal amino acid salt is added to the UV-curable coating
UV curable coatings added to a rubber composition
Surface is coated with
Antibacterial building material characterized by the following. 3. The antibacterial building material according to claim 2, wherein the ultraviolet curable resin is an acrylic polyester resin.