JP4094939B2 - Bathroom flooring - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bathroom flooring and a method for producing the same, and more particularly to a bathroom flooring that can sufficiently exhibit hydrophilicity on the surface of the flooring.
[0002]
[Prior art]
As a well-known flooring material for bathrooms, those formed by FRP such as SMC have been widely used. In such a flooring, since the surface has water repellency, the hot water after bathing remains in the form of water droplets, the surface becomes slippery, or the surface is soiled by mold or the like attached to the water droplets. There's a problem. Therefore, in order to improve the quick drying property of the hot water remaining on the floor material surface, the surface of the base material formed by FRP is made hydrophilic using a hydrophilic paint (hydrophilic coating material) containing a hydrophilic additive such as silica. It is known to perform the conversion process. (See Patent Document 1)
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-301054
[Problems to be solved by the invention]
However, as described above, when a hydrophilic coating material is used, silica hardly appears on the surface of the flooring material due to sedimentation in the silica film, water repellent components in the coating material, and the like. Specifically, the amount of silicon on the floor material surface was 5 mol% or less, and the hydrophilic performance expected as a floor material for bathrooms could not be obtained.
[0005]
Therefore, the present inventor conducted various experiments by changing the conditions such as the coating amount of the hydrophilic coating material, the curing temperature and the curing time, and the presence or absence of the primer layer. It has been found that a large amount can be expressed and a high hydrophilic performance can be retained.
[0006]
OBJECT OF THE INVENTION
The present invention has been devised based on such knowledge, and an object of the present invention is to provide a bathroom flooring that can sufficiently exhibit the hydrophilicity of the hydrophilic coating material.
[0007]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention is a bathroom floor material that has been subjected to a hydrophilic treatment using a hydrophilic coating material containing silicon on the surface side of a resin base material,
When the amount of silicon on the floor material surface is measured by EPMA, the amount of silicon is 8 mol% or more and 16.4 mol% or less. According to such a configuration, since appropriate silicon is expressed on the floor material surface, the hydrophilicity of the floor material surface can be sufficiently exhibited by the silicon. Moreover, since the amount of silicon is specified by mol% (mole percentage), it is easier to grasp the numerical ratio of silicon atoms than by specifying wt% (weight percentage), and silicon and hydrophilicity expressed on the flooring surface It becomes possible to clarify the correlation with the performance.
Here, when the amount of silicon is less than 8 mol%, it is difficult to impart the expected hydrophilicity to the flooring. On the other hand, when the amount of silicon exceeds 30 mol%, the surface smoothness is remarkably lowered and the stain resistance performance, etc. This is a practical problem .
[0008]
It is desirable that silica is added to the hydrophilic coating material, which makes it possible to better retain the hydrophilicity of the flooring surface.
[0009]
Examples of the hydrophilic coating material according to the present invention include a hydrophilic paint and a hydrophilizing agent. The hydrophilic paint means a paint capable of forming a coating film having a static contact angle with water of 50 degrees or less, an alkali silicate-containing inorganic paint, a metal alkoxide-containing inorganic paint, an organic-inorganic composite paint, A surface hydrophilizing paint can be exemplified. Here, the organic / inorganic composite coating is an organic component such as acrylic, urethane, polyester, and epoxy, and an inorganic component such as silicate containing silicon as a main component, and a terminal reaction such as vinyl group, glycidyl group, and methacryloyl group. It is a paint compounded with alkoxysilanes having a group (silane coupling agent) or the like. The surface-hydrophilized paint is a paint having a hydrophilic structure by adding a hydrophilic agent having a hydrophilic group or the like to the paint and outputting a hydrophilic group such as a Si-OH group on the surface. The hydrophilizing agent means a liquid capable of forming a thin film having a static contact angle with water of 50 degrees or less, and in a solvent centered on water or alcohol, alumina composite metal, colloidal silica, etc. In the same manner as the hydrophilic paint, a hydrophilic group such as a Si—OH group is formed on the surface to form a hydrophilic structure.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1A, a bathroom floor 10 according to the present invention is configured by applying a hydrophilic treatment to a resin base 11 using a hydrophilic coating material. In the case where a hydrophilic paint is used, a structure including a primer layer 12 formed on the base material 11 using a primer paint and a topcoat layer 13 formed on the primer layer 12 using a hydrophilic paint. It has become.
As shown in FIG. 1B, the primer layer 12 may be omitted and the topcoat layer 13 may be directly formed on the surface 11A of the substrate 11.
[0011]
Although it does not specifically limit as the said base material 11, It forms with FRP (fiber reinforced plastics), such as SMC.
[0012]
The primer paint has a component structure in which at least a hydrophilic substance is added to the components of a known primer paint. The said hydrophilic substance is added to the main ingredient of a primer coating, Comprising: Hydrophilic materials, such as hydrophilic silica and an alumina, are meant. Further, when a hydrophilizing agent is used, it is applied to the surface of the substrate 11 without providing the primer layer 12.
[0013]
In this specification, “hydrophilic group” means —OH, —O—, —NHCO—, —CONH ₂ — _, —COOH, —SO ₃ H _, —OSO ₃ H, —OPO (OH) _2. , —NH ₂ , —NH—, —NR _{2 and the} like are used as a generic concept.
[0014]
【Example】
Examples of the present invention will be described below together with comparative examples.
[0015]
[Example 1]
First, the base material 11 made of SMC having a plane size of 300 mm square was cut from a press-molded plate having a plane size of 600 mm square. The SMC comprises 80 parts by weight of an unsaturated polyester resin, 20 parts by weight of a crosslinked polystyrene-based low shrinkage agent, 140 parts by weight of aluminum hydroxide, 60 parts by weight of calcium carbonate, 100 parts by weight of glass fiber (1 inch long), and 1 part by weight of a curing agent. Part and other additives such as colored toner, thickener, internal mold release agent and the like were used.
Next, a base treatment (hereinafter simply referred to as “base treatment”) for polishing the surface 11A of the base material 11 with a nonwoven fabric surface treatment material was performed to form irregularities or a rough surface on the surface 11A.
Next, the primer layer 12 was provided by spraying a primer paint onto the surface 11A of the substrate 11. At this time, the thickness of the coating film was about 20 μm. The primer paint is blended in a ratio of 80 parts of a main agent mainly composed of acrylic polyol, 10 parts of a curing agent mainly composed of hexamethylene diisocyanate, and 50 parts of mixed thinner such as toluene and xylene, and hydrophilic as an additive. Silica particles were added at a ratio of 4% by weight based on the main agent.
Next, a top coat layer 13 was provided by spraying a hydrophilic paint on the primer layer 12. At this time, the thickness of the coating film was about 30 μm. The hydrophilic paint is blended in a ratio of 80 parts of a main ingredient mainly composed of acrylic polyol, 20 parts of a curing agent mainly composed of hexamethylene diisocyanate, and 60 parts of a mixed thinner such as toluene and xylene. As additives, hydrophilic silica particles, silicon surfactant, and acrylic beads having an average particle diameter of 20 μm were added. Here, the addition ratio of the hydrophilic silica particles was 6% by weight with respect to the main agent, and the addition ratio of the silicon surfactant and acrylic beads was 5% by weight with respect to the main agent. Thereafter, the primer coating and the hydrophilic coating were cured under conditions of a drying temperature of 120 ° C. and a drying time of 20 minutes, and then cooled to obtain a bathroom flooring 10.
[0016]
[Example 2]
As shown in FIG. 2, with respect to Example 1, the surface treatment was not performed, and the primer layer 12 was not provided, and the thickness of the top coat layer 13 was about 40 μm.
[0017]
[Example 3]
In the same manner as in Example 2, a hydrophilic paint was applied to the surface 11A of the base material 11 by the hand lay-up method without performing the ground treatment and without providing the primer layer 12. The thickness of the top coat layer 13 was about 30 μm, and the curing conditions were a drying temperature of 50 ° C. and a drying time of 120 minutes.
[0018]
[Example 4]
In Example 4, a hydrophilizing agent was applied to the surface 11A of the substrate 11 having a plane size of 300 mm square cut out in the same manner as in Example 1 with a waste cloth. At this time, the coating amount of the hydrophilizing agent was 50 g / m ² . As the hydrophilizing agent in the present example, a mixture of 60 to 70% by weight of water, 30 to 35% by weight of ethyl alcohol, 0.01 to 1% by weight of alumina composite metal, and 5% by weight of colloidal silica was used. .
Then, it was made to dry for about 24 hours at normal temperature, surface hardening was performed, and the flooring 10 was formed.
[0019]
[Example 5]
Compared to Example 4, the hydrophilizing agent and its coating amount were changed. That is, as a hydrophilizing agent, a coating amount of hydrophilic coating material using 50% by weight of water, 48% by weight of ethyl alcohol, 0.01 to 1% by weight of alumina composite metal, and 2% by weight of colloidal silica was used. Was 100 g / m ² .
[0020]
[Comparative Example 1]
The primer layer 12 having a coating film thickness of 20 μm was provided by spraying after Example 3 was ground. Further, the thickness of the top coat layer 13 was changed to about 40 μm.
[0021]
[Comparative Examples 2-3]
For Comparative Example 1, the curing conditions were changed to a drying temperature of 40 ° C. and a drying time of 180 minutes. In Comparative Example 2, the base treatment was not performed, and the thickness of the top coat layer 13 was about 30 μm. In Comparative Example 3, the primer layer 12 was not provided.
[0022]
[Comparative Examples 4 to 5]
In contrast to Example 1, no forced heating was applied, and the curing conditions were normal temperature and a drying time of 24 hours. In Comparative Example 4, the surface treatment was not performed, and the thickness of the top coat layer 13 was about 40 μm. In Comparative Example 5, the primer layer 12 was not provided.
[0023]
[Comparative Example 6]
Compared to Example 5, the coating amount of the hydrophilic coating material was changed to 50 g / m ² . The other conditions were substantially the same as in Example 5.
[0024]
For each flooring 10 obtained as described above, an experiment for confirming hydrophilicity was performed, and the silicon amount on the surface of the flooring 10 was measured. The results are shown in FIG.
[0025]
Here, as an experiment on hydrophilicity, the hydrophilicity in a state immediately after washing the flooring 10 with water is evaluated in three stages. That is, “◎” represents a very good evaluation that most of the surface of the flooring 10 is hydrophilic, and “◯” represents a good evaluation that a part of the surface of the flooring 10 becomes hydrophilic. To express. In addition, “x” represents an evaluation that the surface of the flooring 10 becomes water-repellent and the desired hydrophilicity cannot be obtained.
[0026]
Measurement of amount of silicon is by E PMA, accelerating voltage 15kV, irradiation diameter 50 [mu] m, it was carried out under the conditions of magnification 150 times. At this time, the test object was vapor-deposited with gold (Au) having conductivity, so that gold was corrected.
Here, “EPMA” is an electron probe X-ray microanalyzer, which can measure X-rays, secondary electrons, etc. generated when a finely focused electron beam is applied to the sample surface with a detector. This analyzer can measure the two-dimensional composition distribution on the sample surface by scanning an electron beam or moving a stage.
In addition, in this specification including a claim, "EPMA" means what was mentioned above, and the quantity of silicon was measured by EPMA on the above-mentioned conditions.
[0027]
Further, the surface of the flooring 10 was finely observed by EPMA. In each Example 1-5, many acrylic beads and silica precipitated, and many unevenness | corrugations on the flooring 10 surface were confirmed. On the other hand, in each comparative example, acrylic beads and silica were mostly or completely embedded in the topcoat layer 12, and the surface of the flooring 10 was less uneven. Therefore, it is considered that the unevenness on the surface of the flooring 10 also affects the hydrophilic performance of the flooring 10.
[0028]
【The invention's effect】
As is clear from the above experiments, according to the present invention, the hydrophilicity of the hydrophilic coating material is sufficiently exhibited by setting the amount of silicon on the floor material surface to 8 mol% or more and 16.4 mol% or less. It becomes possible.
[Brief description of the drawings]
1A and 1B are schematic cross-sectional views showing a layer structure of a bathroom flooring according to the present invention.
FIG. 2 is a chart showing experimental conditions and experimental results.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Floor material for bathrooms, 11 ... Base material, 11A ... Surface, 13 ... Topcoat layer

Claims (2)

On the surface side of the resin base material, a flooring for bathroom that has been subjected to a hydrophilic treatment using a hydrophilic coating material containing silicon,
A bathroom flooring characterized in that when the amount of silicon on the surface of the flooring is measured by EPMA, the amount of silicon is 8 mol% or more and 16.4 mol% or less.   The bathroom flooring according to claim 1, wherein silica is added to the hydrophilic coating material.

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