JP3152630B2 - Antibacterial and antifungal decorative board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative board which exhibits not only antibacterial properties but also excellent antifungal properties.

[0002]

2. Description of the Related Art In recent years, nosocomial infection by MRSA (methicillin-resistant Staphylococcus aureus) in hospitals has become a major social problem. For this reason, it is required to use antibacterial materials for white coats of doctors and nurses, clothing and sheets for patients, and interior materials such as curtains and partition materials in hospitals.

In response to such demands, for example, polyester fibers to which antibacterial ceramic particles are added and fibers to which an ammonium salt-based antibacterial agent is fixed have been developed for white coats and curtains. Plastics and the like have also been proposed.

[0004] In recent years, from the viewpoint of improvement of construction technology and energy saving, etc., in order to improve heat insulation properties,
Those with high airtightness are increasing. This has a problem that, in an area with a high temperature and high humidity, such as Japan, dew condensation easily occurs inside the building and molds are often generated.

Further, in recent years, the number of children with allergies has increased, and house dust, mold and the like have been attracting attention as their allergens. For this reason, in public buildings such as schools where many people enter and leave, as well as in cafeterias and bathrooms that require sanitary control, those that have not only antibacterial properties but also antifungal properties are in the spotlight. is there. Further, with the recent antibacterial boom, the use of architectural materials having an antibacterial and antifungal effect is also recommended in ordinary households.

By the way, as an antibacterial decorative board, for example,
Japanese Patent Application Laid-Open No. 7-1414 proposes an antibacterial decorative board in which a resin coating layer containing antibacterial particles is provided on the surface of a pattern layer. The antibacterial particles used in the antibacterial decorative plate are ceramic particles to which silver is fixed, and are intended to suppress the growth of bacteria by the antibacterial action of Ag ions. However, although the antibacterial decorative plate using silver-fixed ceramic particles can be expected to have an antibacterial effect, it can hardly expect a fungicidal effect. If the antifungal property is to be expressed by silver-fixed ceramic particles, it is necessary to add a large amount of the antibacterial particles, which not only increases the cost but also impairs the transparency and gloss of the resin layer. In addition, there is a problem that it becomes difficult to produce an aesthetically pleasing decorative plate.

On the other hand, as a substance having an antifungal action, an organic antifungal agent is well known. However, organic fungicides have problems in terms of safety and durability.
In short, to date, it has been difficult to impart satisfactory antibacterial properties and antifungal properties to decorative panels.

[0008]

SUMMARY OF THE INVENTION Accordingly, it is a primary object of the present invention to provide a decorative board having antibacterial properties as well as antifungal properties. Another object of the present invention is to improve the antibacterial property and the antifungal property of the decorative board without deteriorating the functions such as the design properties as a decorative material for building interior. Still another object of the present invention is to provide a decorative board suitable for use in hospitals, kitchens, cafeterias, bathrooms and the like.

[0009]

Means for Solving the Problems As a result of earnest studies to solve the above-mentioned problems, the present inventors have formed a resin layer containing a substance that elutes boric acid when it comes into contact with moisture or water on the surface of the pattern layer. By doing so, it has been found that an antibacterial and antifungal decorative board which does not deteriorate both the antibacterial property and the antifungal property during use for a long time can be obtained. That is, the antibacterial and antifungal decorative board of the present invention is characterized in that a resin layer containing a boric acid compound that elutes boric acid when it comes into contact with moisture or water is provided on the surface of the pattern layer, and the boric acid compound is SiO ₂ the 25~45wt%, B ₂ O ₃ of 40~60wt%, Na
The _{2 O} is characterized in the use of borosilicate glass containing 5-25 wt%.

[0010] In the present invention, during the borosilicate glass, Al ₂ O ₃ and / or the addition of such alkaline earth metal oxides of ZnO, in particular a part of SiO ₂ Al ₂ O _Third , it is preferable to suppress the elution of boric acid by replacing a part of Na ₂ O with ZnO. In the present invention, the borosilicate glass has a particle diameter of 0.1 to 10 μm.
It is preferable to use one having a size of m.

The antibacterial and antifungal decorative plate according to the present invention comprises a resin layer containing a boric acid compound which is capable of eluting boric acid in contact with water as an antibacterial and antifungal decorative agent on the surface of the pattern layer formed on the substrate. are those provided, as its boric acid compound, an _{SiO 2 25~45wt%, B 2 O} 3 of 40~60wt%, Na ₂ O
It is most preferable to use borosilicate glass containing 5 to 25% by weight.

Here, as an inorganic elution type antibacterial and fungicide which elutes boric acid in contact with water, a boric acid compound containing boron oxide (B ₂ O ₃ ), for example, borosilicate glass is preferably used. . Such boric acid compounds are humid (moisture)
This is because boric acid is eluted in the presence of and boric acid exerts an antibacterial and antifungal effect.

FIG. 1 shows the mechanism by which boric acid elutes from a borosilicate glass having a network structure. As shown in this figure, the borosilicate glass, which is a borate compound, selectively converts boric acid (H ₃ BO ₃ ) and NaOH into B ₂ O ₃ and Na ₂ O in the presence of moisture (moisture). It elutes in the form of

[0014]

The decorative plate having antibacterial and antifungal properties according to the present invention preferably contains Al ₂ O ₃ and / or ZnO.
In particular, by replacing part of the compound component SiO ₂ with Al ₂ O ₃ and part of the compound component Na ₂ O with an alkaline earth metal oxide, the amount of boric acid eluted from the borate compound is adjusted. Is preferred. As examples of the alkaline earth metal oxide, it is preferable to use ZnO 2, CaO 2, MgO and the like. In the case where a part of the compound component SiO ₂ is substituted with Al ₂ O ₃ , the substitution rate is preferably in the range of 5 to 30 wt%, while a part of the compound component Na ₂ O is converted to an alkaline earth metal oxide. The replacement rate when replacing with a product is 5 to 30 wt.
% Is preferred.

The amount of the boric acid eluted can also be controlled by the particle size of the boric acid compound and the content of Na ₂ O in the boric acid compound. For example, the boric acid compound preferably has a particle diameter (diameter) of 0.1 μm or more. The reason for this is that if the particle diameter is smaller than 0.1 μm, it is easy to elute into the surface layer, it becomes difficult to suppress the elution of boric acid, and the good persistence of the antibacterial and antifungal effect deteriorates. On the other hand, when the particle diameter is larger than 10 μm, there is a problem that the light transmittance of the resin layer is deteriorated due to the boric acid compound particles, and the pattern as a decorative board becomes unclear, and the smoothness of the resin layer is easily impaired. . Therefore, it is advantageous that the boric acid compound has a particle size of 0.1 to 10 μm. More preferably, it is in the range of 0.5 to 5 μm.

The boric acid eluted from the decorative plate of the present invention is an extremely small amount and is the same substance that is generally used as a disinfectant, and there is no problem in terms of safety.

In such a decorative board of the present invention, it is advantageous that the thickness of the resin layer is 5 to 50 μm. The reason is that it is advantageous that the thickness of the resin layer is as thin as possible, but it is difficult to form a resin layer having a thickness of less than 5 μm. This is because the decorative board is likely to warp or the like.

Next, a method for producing a decorative board having antibacterial and antifungal properties according to the present invention will be described. This decorative board, after forming a resin layer on the surface of the resin impregnated pattern paper,
The pattern paper, the resin-impregnated core paper and the plywood can be manufactured by a known method of laminating and hot pressing. In particular, in the present invention, as a method of imparting an antibacterial and fungicide function to the decorative board, an antibacterial and fungicide is attached to the surface of the resin layer,
Alternatively, it is desirable to adopt a method of mixing an antibacterial and fungicide into the resin layer. By such a method, an antibacterial and antifungal decorative board excellent in both antibacterial and antifungal properties can be produced with a small amount of antibacterial and antifungal agent.

Here, the method of attaching the antibacterial and fungicide to the surface of the resin layer includes, for example, spraying the antibacterial and fungicide on the surface of the resin layer or applying a suspension of the antibacterial and fungicide. There is a way to do that. As a means for applying the suspension of the antibacterial and fungicide, various means such as spraying, curtain coating, and brushing can be applied.

The basis weight of the antibacterial and fungicide thus adhered to the surface of the resin layer is 0.5 to 10 g / m ² , more preferably ^{2 to 4} g / m ² .
m ² is preferable. The reason is that if the amount of the antibacterial and fungicide attached to the resin layer is less than 0.5 g / m ^2, it is difficult to sufficiently exhibit the antibacterial and fungicide properties. On the other hand, if it is more than 10 g / m ² , not only is it not economical, but also the transparency and glossiness of the resin layer are impaired, making it difficult to produce an aesthetically pleasing cosmetic material.

As a method of mixing an antibacterial and fungicide in the resin layer, for example, a method of adding a particulate antibacterial and fungicide to a liquid resin and uniformly dispersing the same with a homomixer or the like is used. There is a method in which a resin layer is formed by applying or coating the surface of a resin-impregnated patterned paper.

The content of the antibacterial and fungicide mixed in the resin layer is preferably 0.5 to 10% by weight, more preferably 2 to 7% by weight, based on the resin layer. The reason is that if the amount of the antibacterial and fungicide attached to the resin layer is less than 0.5 wt%, it is difficult to sufficiently exhibit the antibacterial and fungicidal properties. On the other hand, if it is more than 10% by weight, not only is it not economical, but also the transparency and gloss of the resin layer are impaired, making it difficult to produce an aesthetically pleasing cosmetic material.

As the matrix resin forming the resin layer, it is preferable to use at least one selected from melamine resins, polyester resins, acrylic resins and diallyl phthalate resins.

[0025]

EXAMPLE 112% melamine resin containing 34% titanium oxide and having a solid content of about 48% was impregnated with 112 g / m ² of melamine resin (impregnation rate = weight of resin amount / resin impregnated paper). The pattern layer having a total weight of 40% was applied at a rate of 60 g / m ² using a roll coater to form a resin layer having a thickness of 7 μm.

Next, on the surface of the resin layer, as an antibacterial and fungicide, SiO ₂ : 28 wt%, B ₂ O ₃ : 50 wt%, Na ₂ O: 12 wt%, ZnO: 7 w
A suspension containing particles of borosilicate glass (diameter: 3 μm) having a composition of t% and Al ₂ O ₃ : 3 wt% is spray-coated so that the borosilicate glass is contained in the ratio shown in Table 1. I let it adhere.

On the other hand, a pattern paper similar to this pattern paper is impregnated with melamine resin, and a core paper having an impregnation rate of melamine resin (impregnation rate = weight of resin amount / weight of entire resin impregnated paper) of 30% is applied. Obtained.

Next, according to the usual method for producing a melamine resin decorative board, one patterned paper having the resin layer formed thereon is made the uppermost layer, and the three core papers are laminated thereunder.
Hot pressing was performed at 50 ° C. under the condition of 80 kg / cm ² for 60 minutes to obtain a melamine decorative board.

The thus-obtained decorative plate of the present invention and the conventional decorative plate manufactured without blending the antibacterial and fungicide are cut into a substantially square having a side of 1 cm, and the cut surface is covered with a resin. A sample in which the dissolution of formalin was prevented was prepared and tested for antibacterial and antifungal properties.

For the antibacterial test, 10 ml of a phosphate buffer in which about 1.0 × 10 ⁵ Escherichia coli / ml were suspended and phosphate in which about 7.0 × 10 ⁵ staphylococcus aureus were suspended as test bacteria. Each was immersed in 10 ml of buffer solution, and cultured at 25 ° C. for 24 hours. Then, the number of Escherichia coli and the number of Staphylococcus aureus were measured, and the results are shown in Table 1. ASTM for antifungal test
The results were shown in Table 1 according to -G-21.

As is clear from the results shown in Table 1, it was confirmed that the decorative board of the present invention was extremely excellent in antibacterial effect and antifungal effect.

[0032]

[Table 1]

Regarding the persistence of the antibacterial and antifungal function,
The life was estimated by immersing the sample in water and measuring the amount of boric acid eluted. X = log (elution time), Y =
In the case of log (elution rate), since the following linear regression equation is established for both, the values of the initial elution time and elution rate are substituted into the following equation to determine the elution rate (k) of boric acid and the constant α. , And the estimated life was calculated. Y = kX + α The estimated life here is an estimated time until 100% of boric acid elutes. The results are shown in Table 2. Table 2
As shown in the decorative board of the present invention, the addition of Al ₂ O ₃ and ZnO suppresses the dissolution of boric acid, and the dissolution rate decreases.
It was found that boric acid gradually eluted over a long period of time.

[0034]

[Table 2]

[0035]

As described above, according to the present invention, it is possible to provide a decorative board which is excellent in the function as a decorative board and which is excellent in both antibacterial and antifungal properties.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating the mechanism of boric acid elution.

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) B27D 5/00 B27K 3/16 B27M 3/00

Claims (3)

(57) [Claims] Claims: 1. The surface of a pattern layer is brought into contact with moisture or water.
To provide a resin layer containing a boric acid compound that elutes boric acid
Antibacterial and antifungal decorative panelAt As the boric acid compound, SiO ₂ 25-45wt%, B ₂ O
₃ 40-60wt%, Na ₂ Borosilicate containing 5 to 25 wt% O
Antibacterial and antifungal decorative panel characterized by using glass . 2. The borosilicate glass has a particle size of 0.1.
Claims, characterized in that within the scope of ~10μm
2. The antibacterial and antifungal decorative board according to 1. 3. The borosilicate glass contains Al ₂ O ₃
And / or by adding an alkaline earth metal oxide, wherein characterized in that so as to suppress the elution of boric acid
Item 3. An antibacterial and antifungal decorative panel according to item 1 or 2 .