JPH10183057A - Floor coating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a floor coating material which can give a coating film being lowly slippery and having high durability, luster, gloss, high burn- preventive effect and high antibacterial properties by selecting a coating material comprising a urethane emulsion resin, an organic solvent, an organic ultraviolet absorber and an antibacterial agent and being capable of giving a dry coating film having a specified pencil hardness. SOLUTION: A urethane emulsion resin of 18-23 pts.wt. is mixed with 1-3 pts.wt. organic ultraviolet absorber, especially a benzotriazole compound represented by the formula, 0.5-8 pts.wt. organic solvent, 50-100 pts.wt, water, 0.1-10 pts.wt. antibacterial agent derived from an extract of grape fruit seeds and 0.1-1 pt.wt. silver-containing antibacterial agent to obtain a floor coating material which can give a dry film having a pencil hardness of 2H to 4H. This material is applied to a floor in a coating amount to give a dry film thickness of 30-70μm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to flooring and P
The present invention relates to a floor paint applied to floor materials such as tiles and cushion tiles.

[0002]

2. Description of the Related Art In recent years, flooring materials such as flooring, P tiles (plastic flooring materials) and cushion floors have been widely used in homes instead of conventional tatami mats and carpets. However, unlike Western countries, Japanese households walk on the floor with slippers or socks instead of shoes, so they are very slippery, and the danger is particularly pronounced in homes with the elderly.

[0003] Of these, the flooring is particularly often used in a dining kitchen or the like. In this case, the flooring is easily damaged by a chair or the like, and the floor material of a children's room or the like is easily damaged by playing with building blocks or the like. These places are particularly easy to get dirty in general households, and the aesthetic appearance is remarkably impaired, and there is a possibility that they may become a hotbed of mold and bacteria.

In addition, cushion floors and P tiles are often used in hospitals, cafeterias, etc., but these places need to prevent nosocomial infection and suppress the generation of bacteria such as Escherichia coli O-157. In the case of hospitals, there are many people who have difficulty walking, and the flooring is absolutely required to be non-slip.

On the other hand, with the declining birth rate, the number of households that keep pets such as dogs and cats in their homes is increasing. As a result, the floor is dirty and mold and bacteria are liable to occur, but it has been pointed out that these are closely related to atopic dermatitis and bronchial asthma. Further, the conventional floor paints cause so-called "burn" due to ultraviolet rays such as sunlight, and even in a newly constructed house, remarkable discoloration / fading has occurred in less than one year in a place where sunlight is applied.

To solve these drawbacks, some floor coatings have been proposed, but at present there is no solution to all of the above problems. That is, there have been problems such as low resistance, susceptibility to scratching, use of substances that are harmless to the human body but cause harm to pets, and lack of sustained antibacterial action.

[0007]

The present invention solves the above-mentioned problems of the prior art, that is, it can be used irrespective of a flooring, a P tile, a cushion floor, and the like. The present invention provides a safe floor coating having antibacterial properties, which has a non-slip property, forms a film having good gloss and gloss, and has a high effect of preventing discoloration of applied floor material, so-called "burn". The purpose is to:

[0008]

The floor coating composition of the present invention comprises a urethane emulsion resin, an organic solvent, an organic ultraviolet absorber and an antibacterial agent as described in claim 1, and has a hardness after drying. Is a floor paint having a pencil hardness of 2H or more and 4H or less.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, it is necessary to use a urethane emulsion resin. That is, the urethane-based emulsion imparts the slip resistance and water resistance to the floor material after application, and firmly holds the organic ultraviolet absorber and the antibacterial agent.

Examples of the urethane emulsion resin include Neoretz R-960 and R-969 manufactured by Zeneca, and VTW1265 and 1801 manufactured by Hoechst. A durable film can be formed.

[0011] The urethane emulsion resin has a hardness after drying of the floor paint of 2H or more and 4H or more in pencil hardness.
It is necessary to select the compounding ratio and type so as to be as follows. That is, if the hardness of the paint is low, the coating is easily lost, and if the hardness is high, the coating is easily peeled. In particular, when the pencil hardness is 3H or more and 4H or less, the life of the paint film can be made extremely long, and it can be used irrespective of the type of flooring such as P tile and cushion tile as well as flooring flooring. be able to.

In the present invention, the pencil hardness is a value measured as follows. That is, using a new pencil H-6H of a pencil made by Mitsubishi Pencil "UNI", exposing the core of one end of the pencil without sharpening the core, holding the other end, and attaching the core of the exposed portion to the floor. While maintaining the contact angle at about 30 degrees on the dried coating surface after applying the paint for application, the pencil is slowly moved by the weight of its own weight only, and the presence or absence of scratches on the paint surface at that time is visually observed. At this time, the pencil hardness in the present invention was defined as the hardness of the hardest pencil that did not cause scratches.

In the present invention, it is necessary to incorporate an organic solvent. That is, the organic solvent controls the drying time of the floor paint after being applied together with the water. In other words, if the drying time is short, the thickness unevenness (spraying unevenness in the case of spray coating, brush stitching in the case of brush application) generated by coating remains as it is, and the gloss and aesthetics required for the flooring material are left. Is significantly impaired.

On the other hand, if the drying time is long, the coating property and the productivity may be reduced.
Not only does workability deteriorate, but also dust in the air tends to deposit, and when applied to absorbent flooring such as flooring, the penetration into the interior of the flooring increases and paint becomes unnecessarily necessary. Is required and may cause unexpected problems. Therefore, when the brush is applied, the drying time is 10 minutes or more and 20 minutes or less when the temperature is 5 ° C. and the relative humidity is 50%. It is preferable to make adjustments as follows.

Another function of the organic solvent is to contribute to the stability of the paint. In other words, it functions to prevent separation and sedimentation of components during long-term storage and to stabilize quality.

The organic solvent is ethyl cellosolve in consideration of its boiling point, compatibility with water and azeotropic properties, its effect on viscosity when added to the system, and its effect on urethane emulsion resins. Is desirable. In addition, when ethyl cellosolve is used, a beautiful film without any unevenness can be obtained even when recoating is performed.

In the present invention, the ultraviolet absorber must be organic. Normally, inorganic absorbers, especially titanium oxide, used as ultraviolet absorbers have the property of decomposing nearby organic substances, and this property is considered to be relatively low in photoactivity, as well as anatase type titanium oxide with high photoactivity. Even with titanium oxide having rutile crystal structure, 1
When used for a long time of more than one year, the effects on the resin component as a binder and the antibacterial agent cannot be ignored. That is, when an inorganic material such as titanium oxide is used as the ultraviolet absorber, the antibacterial property is easily lost, and the urethane resin deteriorates and becomes slippery in about one year, and further peeling and cracking occur. Or it may be powdered. When an organic ultraviolet absorber is used, no photoactivity with respect to the urethane resin occurs, so that the coating film is not deteriorated and its properties are maintained for a long time.

Examples of the organic ultraviolet absorber include benzotriazole-based compounds, benzophenone-based compounds, and salicylic acid-based compounds. The benzotriazole-based compound must be a benzotriazole-based compound in view of dispersibility in a urethane-based emulsion resin and applicability. Is desirable. Such benzotriazole-based compounds include 2- (5-methyl-2-hydroxyphenyl) benzotriazole, 2- [2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H- Benzotriazole, 2- (3,5-di-
t-butyl-2-hydroxyphenyl) benzotriazole, 2- (3-t-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2-
(3,5-di-t-butyl-2-hydroxyphenyl)
-5-chlorobenzotriazole, 2- (3,5-di-
and t-amyl-2-hydroxyphenyl) benzotriazole, 2- (2'-hydroxy-5'-t-octylphenyl) benzotriazole and the like.

In particular, the benzotriazole compound shown in Chemical formula 1 is preferable because it maintains high ultraviolet absorption for a long period of time. This is available from Ciba-Geigy as Tinuvin 384.

[0020]

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The substance shown in Chemical formula 1 has a slight visible light absorbing property and is light yellow. Therefore, when the substance is applied to a dark floor material, a large amount may be added. It is preferable to adjust the amount of the general-purpose floor coating material as appropriate.
It should be noted that if the amount is too large, the durability may be reduced.

It is necessary that the blending amount of these ultraviolet absorbers exhibits its effect and is maintained for about one year or more. The addition of an auxiliary agent for improving the stability of the organic ultraviolet absorbent to the floor coating composition of the present invention may be carried out as long as other physical properties and the effects of the present invention are not hindered.

In the present invention, the antibacterial agent is preferably an organic antibacterial agent. That is, when a silver-based antibacterial agent used in recent years is used alone, the antibacterial agent is hardly visible on the surface at the time of application, so that it is not effective. Transparency, which is required, is easily lost, and the urethane resin is likely to deteriorate due to the catalytic properties of silver.

There is also an antibacterial agent using a heavy metal such as copper, but there is a concern that it may affect the human body and the like, and it cannot be said that it is safe.

Here, an organic antibacterial agent, particularly an antibacterial agent derived from natural products for safety and health is desirable. Hinokithiol, chitosan, etc. are known as antibacterial agents derived from natural products.However, in view of the mixing property with the urethane emulsion resin, the applicability required as a floor material paint, and the long-term stability, the grapefruit seed extract-derived Particularly desirable are antimicrobial agents. This is known for its extremely high antibacterial activity and safety for humans and animals, and can be obtained from Japan Water Treatment Technical Research Institute.

When a grapefruit seed extract-derived antibacterial agent is used in combination with a small amount of a silver-based antibacterial agent, a remarkable synergistic effect can be obtained. If the antibacterial agent used at this time is a zeolite surface to which silver is impregnated, handleability is easy and mixing is relatively easy. Such a silver-impregnated zeolite is available from Shinagawa Fuel and the like. Further, as other silver-based antibacterial agents, those known as Ceragrace are available from Japan Water Treatment Engineering Co., Ltd. and the like. This product has an antibacterial action by the action of active oxygen, but a combination of this and the above-mentioned organic antibacterial agent derived from the grapefruit seed extract provides a truly revolutionary antibacterial action.

When the amount of these antibacterial agents is increased, the film becomes weaker and the durability is reduced. On the other hand, if the compounding amount is small, the antibacterial action is low.

The above-mentioned urethane emulsion resin, organic solvent, organic ultraviolet absorber and antibacterial agent are mixed by means such as a screw mixer to obtain the floor coating of the present invention. As a compounding ratio, for example, NEORETZ R manufactured by Zeneca
-960 is 18 parts by weight or more and 23 parts by weight or less, the benzotriazole compound represented by the chemical formula 1 is 1 part by weight or more and 3 parts by weight or less, and Ciba Geigy Co., Ltd.
0.1 parts by weight or more and 2 parts by weight or less, ethyl cellosolve as a solvent 0.5 parts by weight or more and 8 parts by weight or less, water 50 parts by weight or more and 100 parts by weight or less, an antibacterial agent derived from grapefruit seed extract (Nippon Water Treatment Giken WJ-013)
Is 0.1 to 10 parts by weight, and the silver-based antibacterial agent is 0.1 to 1 part by weight, whereby a particularly excellent effect can be obtained.

The floor coating composition of the present invention can be applied to a floor material by means such as a brush or a roller, or by spraying. At this time, it is necessary that the coating amount is 30 to 70 μm in thickness after drying. That is,
If the thickness is less than 30 μm, the durability becomes poor.
If it is more than m, the time required for drying becomes longer, and at the same time unevenness in thickness occurs, and the aesthetic appearance required for flooring is impaired. Here, even if the thickness is less than 30 μm, an extremely good coating can be obtained by performing the recoating.
In addition, although coating irregularities are likely to occur when the coating is performed repeatedly, in the case of the floor paint of the present invention, the occurrence of such irregularities can be suppressed by the action of the organic solvent.

After the coating, drying is performed. Usually, in the tactile sensation test with the finger after 10 to 20 minutes, almost no wet feeling is obtained, and after 2 hours, almost constant weight is reached. The floor paint of the present invention can be used irrespective of flooring, P tile or cushion floor, and when applied to these,
It is a safe flooring material that is resistant, slippery, forms a film having good gloss and gloss, has a high effect of preventing "burn", and has antibacterial properties.

[0031]

Next, examples of the present invention and comparative examples will be described. The chemicals shown in Table 1 were mixed with a screw mixer so as to have the compounding ratio shown in Table 2 to obtain a floor coating. These were applied to a dining flooring (flooring) with a brush to a thickness of 50 μm. The situation after application is shown in FIG. In FIG. 1, reference numeral 2 denotes a floor material, and reference numeral 1 denotes a coating made of the floor paint of the present invention. 2 hours after application, January,
Half-year and one-year progress were observed. The drying time after application was judged by the tactile sensation with a finger, and the pencil hardness 2 hours after application was also measured. The results are shown in Table 2.

In Table 2, gloss / transparency, scratch / peeling prevention and discoloration prevention were determined by visual observation.
For slip prevention, a new sock was worn and a sensory test was used to judge.
X: those determined to be insufficient 2 hours after application, x: those determined to be insufficient at the time of observation six months later, x: those determined to be insufficient at the time of observation one year later, When it was judged that the effect was sufficiently maintained even at the time of observation after one year, it was evaluated as ◎. In addition, the place where the said flooring material is installed is a place where the sunlight through the transparent glass illuminates for almost the same time.

The antibacterial properties of these samples were evaluated as follows. The above flooring material was collected, and the flooring material was allowed to stand at 35 ° C. in a sterilized petri dish in which 1 ml of water containing Aspergillus niger at a concentration of 10 ⁶ / ml was dropped, so that the coating was facing down. 24 hours later, the number of viable bacteria was examined.

When the number of viable bacteria after 24 hours became 10 ² / ml or less, ◎ indicates that the number of viable bacteria decreased to 10 ³ / ml or less, ○ indicates that the number of viable bacteria became 10 ⁴ / ml or less, Those not observed or increased were evaluated as x.

[0035]

[Table 1]

[0036]

[Table 2]

From Table 2, the effect of the floor paint of the present invention is clear. In addition, similar to the above-mentioned Experimental Example 2, except that an acrylic emulsion resin was used in place of the urethane emulsion resin and applied to the floor material and dried, it was examined. It could not be used.

A floor coating was prepared in the same manner as in Experimental Example 2 except that titanium oxide fine powder was used as an ultraviolet absorber. It was prone to non-uniformity and required constant stirring during use. When this paint was similarly applied to a floor material, gloss and transparency were lost in about two months, and almost no anti-slip effect was observed.

In the same manner as in Experimental Example 2, except that a urethane-based emulsion resin was used,
9. The same examination was performed using VTW1265 and WTW1801 manufactured by Hoechst. As a result, it was almost the same as the case of using Neoretz R-960 manufactured by Zeneca, but the life of the coating was about 10 months in each case.

On the other hand, the floor paint used in Experimental Example 2 was applied to the P tile of the kitchen floor and the cushion floor of the bathroom undressing room. Transparency was good.

[0041]

EFFECT OF THE INVENTION The floor coating of the present invention can be used for flooring, P
It can be used regardless of tiles or cushion floors, etc., and when applied to them, forms a coating with durability, non-slip, and good gloss and gloss,
In addition, the applied flooring material has a high effect of preventing "burn" from the applied flooring material and is a floor coating having safe antibacterial properties.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a floor material on which a coating is formed by applying a floor paint according to the present invention.

[Explanation of symbols]

 1 floor paint according to the present invention 2 floor material

Claims (5)

[Claims] 1. A floor coating material comprising a urethane emulsion resin, an organic solvent, an organic ultraviolet absorber and an antibacterial agent, and having a pencil hardness of 2H or more and 4H or less after drying. 2. The floor paint according to claim 1, wherein a stabilizer for an organic ultraviolet absorber is provided in addition to the above components. 3. The floor coating according to claim 1, wherein the organic solvent is ethyl cellosolve. 4. The floor coating according to claim 1, wherein the antibacterial agent is an antibacterial agent derived from a grapefruit seed extract. 5. The floor coating according to claim 1, wherein the antibacterial agent is a mixture of an antibacterial agent derived from grapefruit seed extract and a silver-based antibacterial agent.