JPH10265730A - Inorganic antimicrobial agent slurry - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an inorganic antimicrobial agent slurry for a water-soluble coating material capable of readily being mixed, having dispersibility capable of being improved by addition of a small amount of disperser and water, and having improved operability by formulating specific proportions of a specified inorganic antimicrobial agent, the water and triethylamine. SOLUTION: This inorganic antimicrobial agent slurry of an inorganic antimicrobial agent such as silver-based one for adding to a coating material comprises (A) 15-50 wt.% water, (B) <=1 wt.% triethylamine and (C) the balance of the inorganic antimicrobial agent having 0.5-1 μm particle diameter. The result of the visual observation of the state after addition of the slurry to a water-soluble coating material shows that no aggregation of the antimicrobial agent and no discoloration of the coating material are observed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an inorganic antibacterial agent slurry for water-soluble coatings. More specifically, the present invention relates to an inorganic antibacterial agent slurry which can be uniformly dispersed by a simple mixing method without using a dispersant or an anti-settling agent when adding an inorganic antibacterial agent to a water-soluble paint.

[0002]

2. Description of the Related Art In general, antibacterial paints, regardless of whether they are water-based or solvent-based, are prepared by mixing an antibacterial / antifungal agent into a liquid paint, stirring the mixture, applying the mixture on a coating, forming a cured coating film, and applying the cured coating. It prevents and suppresses the growth of fungi and mold on the membrane. The most important and difficult step in the production process of this antibacterial paint is the mixing and stirring step of the antibacterial and fungicide. This is because a predetermined antibacterial and fungicidal effect cannot be obtained unless the antibacterial and fungicide are uniformly dispersed in the paint. However, in the mixing and stirring process, the antibacterial / antifungal agent is currently added and mixed in a powder state, and at this time, the antibacterial / antifungal powder having a very fine particle diameter is secondarily aggregated by the particles. Is often caused. This is because the antibacterial and antifungal agent needs to increase the probability of contact with bacteria and fungi, so that the surface of the particles needs to be ultrafine powder in order to increase the specific surface area. In order to disperse the secondary agglomeration and maintain a stable state in the paint, long-time stirring and use of various dispersants, anti-settling agents and the like are indispensable. In addition, antibacterial
As the addition amount of the fungicide increases, the addition amount of the dispersant or the anti-settling agent also increases significantly. In general, the addition amount of the dispersant to the inorganic antibacterial agent is required to be 20% by weight or more, and sufficient stirring is still required. Attempts have been made to add a pre-adjusted antimicrobial agent slurry to the liquid paint, but it is not easy to disperse the antimicrobial / fungicide powder in the water itself, and here too a large amount of dispersant and water are used. In addition, a large amount of dispersant and water may cause a reaction with other raw materials / pigments to make it impossible to produce a paint.

[0003]

DISCLOSURE OF THE INVENTION In view of the above problems, the present invention improves the dispersibility of an antibacterial / fungicide powder with a small amount of a dispersant and a small amount of moisture, and is suitable for use in a water-soluble paint. An object is to provide an antimicrobial agent slurry.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, the water content has been reduced to 15 to 15%.
Under the condition that 50% by weight and the addition amount of triethylamine as a dispersant is 1% by weight or less, the remainder has a particle size of
By using an inorganic antibacterial agent slurry composed of an inorganic antibacterial agent as an additive to a water-soluble paint, the inorganic antibacterial agent can be added to a water-soluble paint without adding a new dispersant and without stirring for a long time. It was evenly dispersed in the medium, and it became possible to easily impart antibacterial properties with a minimum amount. That is, the present invention can reduce the degree of dilution into the liquid paint by adjusting the water content to 50% by weight or less. If the water content exceeds 50% by weight, the water content of the water-soluble paint exceeds the water content of the water-soluble paint, so that it is necessary to lower the water content of the base water-soluble paint in order to adjust the water content after addition. Difficult. If the water content is less than 15% by weight, good dispersibility cannot be obtained. When the addition amount of triethylamine exceeds 1% by weight, it tends to react with the pigment originally present in the base water-soluble coating material and the dispersant used for dispersing the same, and thus may not be used as a coating material. If the particle size of the inorganic antibacterial agent exceeds 1 μm, roughness on the coating film surface is likely to occur. If the particle size of the inorganic antibacterial agent is less than 0.5 μm, the cost of producing the powder itself increases, which is problematic.

[0005]

Example 1 100 cc of distilled water, 200 g of a silver-based inorganic antibacterial agent (average particle system: 0.8 μm), 1.4 g of triethylamine as a dispersant, and 500 g of zirconia balls (φ5) and 150 g of (φ0.5) as balls. 500cc
And mixed in a ball mill for 48 hours. The obtained slurry had a water content of 33.6% by weight and a powder particle size of the inorganic antibacterial agent of 0.6 to 1 μm. Further, 3% by weight of this slurry was added to the water-soluble paint, and the state was visually observed. As a result, there was no aggregate of the antibacterial / antifungal agent particles, and the color of the paint did not change.

Comparative Example 1 A slurry was obtained in the same manner as in Example 1 except that the amount of distilled water was changed to 300 cc. The obtained slurry had a water content of 59.8% by weight and a powder particle size of the inorganic antibacterial agent of 0.6 to 1 μm. 5% by weight of this slurry was added to the water-soluble paint, and the state was visually observed.
There were no agglomerates of the antibacterial and fungicide particles, but the color of the paint became lighter and the viscosity decreased.

Comparative Example 2 Example 1 was repeated except that the amount of the dispersant triethylamine was changed to 5 g (0.64% by weight).
A slurry was obtained in the same manner as described above. The obtained slurry had a water content of 32.8% by weight and a powder particle size of the inorganic antibacterial agent of 0.6 to 0.6%.
It was 1 μm. 3% by weight of this slurry in water-soluble paint
As a result of visual observation of the state after the addition, there was no aggregate of the antibacterial and antifungal agent particles, but the paint was discolored and the viscosity was increased.

Comparative Example 3 A water-soluble paint had a particle diameter of 0.6 to
1 μm of an inorganic antibacterial agent was added in a powder state at 3% by weight, and a dispersant was added at 300% by weight based on the inorganic antibacterial agent. After stirring for 60 hours,
White powder of inorganic antibacterial agent could not be confirmed.

The water-soluble paint containing the inorganic antibacterial agent obtained in Example 1 and Comparative Example was applied to an acrylic plate cut into 3 cm squares and dried, and then directly contacted with Alternaria bacteria to observe the killing status and to observe the antibacterial properties. Was checked. Table 1 shows the results.

[0010]

[Table 1]

From the above results, the product of the present invention can obtain good dispersibility and predetermined antibacterial properties only by simple mixing without deteriorating the base water-soluble paint.

[0012]

According to the inorganic antibacterial agent slurry of the present invention,
It can be easily mixed with a water-soluble paint, and good antibacterial properties can be obtained.

Claims (1)

[Claims] 1. An inorganic antibacterial agent to be added to a paint, wherein the inorganic antibacterial agent has a water content of 15 to 50% by weight, an addition amount of triethylamine of 1% by weight or less, and a balance of 0.5 to 1 μm. An inorganic antibacterial agent slurry for water-soluble coatings, characterized by the following.