JP6068288B2 - Interior sheet for bathroom - Google Patents

Description

  The present invention relates to an interior sheet constructed on a floor surface or a wall surface of a bathroom.

Generally, hard materials such as porcelain tiles, FRP, and hard rubber are used as bathroom floor materials and wall materials. Moreover, the structure which has a small processus | protrusion and an unevenness | corrugation on the surface is generally employ | adopted for the floor of a bathroom in order to provide slipperiness and improve drainage. However, when a structure having small protrusions or irregularities is adopted on the surface of the floor material made of the hard material, the bather's bare skin may come into contact with the hard irregularities, and the bather may feel pain. In particular, when a bather puts his knees on the floor in the bathroom, he often feels pain because his weight concentrates.
The inventor has proposed a floor sheet having desired irregularities for the purpose of reducing the pain (Patent Document 1). In particular, a vinyl chloride resin-made floor sheet is easy to manufacture and has an appropriate flexibility, and thus has an excellent pain-reducing effect, and is suitable as a bathroom floor sheet.

  However, when a vinyl chloride resin floor sheet is used in a bathroom, the surface of the floor sheet may be whitened due to moisture absorption or the like while it is used. Similarly, when a vinyl chloride sheet is applied to a bathroom wall or ceiling, the surface may be whitened in the same manner. When the surface of a bathroom interior sheet such as a floor sheet is whitened, the appearance of the bathroom floor is deteriorated, and thus improvement is required.

JP 2012-158914 A

  The objective of this invention is providing the interior sheet for bathrooms made from a vinyl chloride resin which can suppress whitening.

  In the conventional vinyl chloride resin sheet, calcium carbonate is mixed in the surface layer for the purpose of hiding the color of the background layer. As a result of various studies, the present inventor has found that the calcium carbonate dissolves and disappears by sanitary products such as shampoo and rinse. And it discovered that the loss | disappearance of this calcium carbonate contributed to whitening of an interior sheet, and also advanced research, and completed this invention.

The bathroom interior sheet of the present invention has a sheet main body and a surface layer provided on the surface of the sheet main body, and the surface layer includes a vinyl chloride resin and a colorant as a polymer. And a vinyl chloride resin , and substantially free of calcium carbonate.

In a preferred bathroom interior sheet of the present invention, the masterbatch colorant is contained in an amount of 3 to 20 parts by mass with respect to 100 parts by mass of the vinyl chloride resin.

  The bathroom interior sheet of the present invention is not easily whitened even when shampoo or hot water used in the bathroom is applied. By using the interior sheet of the present invention, it is possible to construct a bathroom that can suppress whitening for a long period of time and hardly deteriorate in appearance.

The top view of the interior sheet for bathrooms of this invention. The expanded sectional view cut | disconnected by the II-II line | wire of FIG.

Hereinafter, the present invention will be described with reference to the drawings as appropriate.
FIG. 1 is a plan view showing one embodiment of a bathroom interior sheet of the present invention, and FIG. 2 is an enlarged cross-sectional view thereof. In FIG. 1, only a part of the surface of the interior sheet for bathroom is shown.
In the present specification, the description “AAA to BBB” means “AAA to BBB”.
In addition, FIG. 1 represents only a part of the surface of the bathroom interior sheet, and the actual bathroom interior sheet may be repeatedly arranged with pattern units arranged on the surface.

[Outline of interior sheet for bathroom]
1 and 2, the bathroom interior sheet 1 includes a seat body 2 and a surface layer 3 provided on the surface of the seat body 2. The surface layer 3 includes a vinyl chloride resin and a masterbatch colorant as resin components, but does not substantially include calcium carbonate.
The bathroom interior sheet 1 of the present invention is used on the inner surface of at least one bathroom selected from a bathroom floor, a bathroom wall, and a bathroom ceiling. Hereinafter, the interior sheet used on the bathroom floor is referred to as a bathroom floor sheet or floor sheet, and the interior sheet used on the bathroom wall is referred to as a bathroom wall sheet, which is used on the bathroom ceiling. The interior sheet is called a bathroom ceiling sheet.

In each figure, the floor sheet 1 is represented as a bathroom interior sheet.
In the illustrated example, the surface of the floor sheet 1 (surface of the surface layer 3) is formed in an uneven shape. The uneven shape is not particularly limited, and can be appropriately designed. In the present embodiment, the surface of the floor sheet 1 is formed in a concavo-convex shape composed of a large protrusion and a small protrusion formed from the large protrusion, as in the floor sheet of JP2012-158914A. . Since the shape of the large protrusions and the small protrusions and the forming method thereof are disclosed in detail in the above publication, the disclosure thereof is omitted here as it is described in the present specification. But the interior sheet of this invention is not limited to the case where the surface is formed in uneven | corrugated shape, The surface may be flat.
The interior sheet of the present invention may be formed into a rectangular or polygonal shape like a floor tile, or may be formed into a long sheet. The long interior sheet is usually wound around a roll and stored and transported. The shape of the long interior sheet is not particularly limited, and examples thereof include an elongated rectangle having a width of 800 mm to 4000 mm and a length of 2 m to 300 m.

In the illustrated example, the surface layer 3 and the sheet main body 2 are formed separately, but the present invention is not limited to this, and the surface layer 3 and the sheet main body 2 may be integrally formed of one material.
Further, since the surface layer 3 includes a colorant, the surface layer 3 itself exhibits a desired color. However, if necessary, the surface of the surface layer 3 may be subjected to a cosmetic process such as cosmetic printing (not shown). .
Furthermore, a surface protective film made of an ultraviolet curable resin or the like may be formed on the surface of the surface layer 3 (not shown).

[Sheet body]
The seat body 2 is a member that determines the structure of the bathroom interior sheet.
Since the sheet body 2 can be easily stored and transported and can be easily carried into the bathroom at the time of construction, it is preferable that the sheet body 2 has flexibility such that it can be wound around a roll. The seat body 2 preferably has a cushioning property in order to enhance pain resistance, and further has a heat insulating property in order to reduce heat shock and increase warmth in the bathroom, and therefore preferably includes a foam layer. . But the sheet | seat main body 2 may be comprised from the non-foamed body.
The seat body 2 can adopt an appropriate configuration according to a bathroom floor sheet, a bathroom wall sheet, or a bathroom ceiling sheet. Hereinafter, the layer structure of the sheet body 2 when the interior sheet is the floor sheet 1 will be specifically described.
As shown in FIG. 2, the sheet body 2 of the floor sheet 1 includes a foam layer 4 and a reinforcing layer 5 that are integrally provided on the back side of the surface layer 3.
In the illustrated example, the foam layer 4 includes two layers, an upper foam layer 41 and a lower foam layer 42, and the reinforcing layer 5 is provided between the upper foam layer 41 and the lower foam layer 42. A non-foamed intermediate layer 6 is provided on the surface of the upper foam layer 41.

When the foam layer 4 is composed of a plurality of layers such as the upper foam layer 41 and the lower foam layer 42, they may be formed of the same material or different materials. The upper foam layer 41 and the lower foam layer 42 are formed from a layer containing a resin, for example. Examples of resins that form the upper foam layer 41 and the lower foam layer 42 include vinyl chloride resins; polyolefin resins; vinyl acetate resins such as ethylene-vinyl acetate copolymers; acrylic resins such as ethylene-methacrylate resins; Amide resin; Polyester resin; Thermoplastic resins such as various elastomers such as olefin elastomer and styrene elastomer are used. As the main resin component of the foamed layer 4, a vinyl chloride resin is preferable because it has excellent flexibility and excellent adhesion to the surface layer 3.
Here, in this specification, the main resin component of a certain layer is 60% by mass or more, preferably 80% by mass with respect to the entire resin component contained in the layer (when the total resin component is 100% by mass). % Or more, more preferably 90% by mass or more.

The upper foam layer 41 and the lower foam layer 42 may have the same expansion ratio or different expansion ratios. The expansion ratio of the upper foam layer 41 and the lower foam layer 42 is not particularly limited, but is usually independently 1.05 to 5.0 times, preferably 1.1 to 3.5 times. It is. If the expansion ratio is too low, the floor sheet 1 may not be provided with sufficient cushioning properties. If the expansion ratio is too high, the bather tends to dent when riding, and the feeling of use may worsen.
The thicknesses of the upper foam layer 41 and the lower foam layer 42 are not particularly limited. For example, the upper foam layer 41 has a thickness of 0.2 mm to 1.2 mm, and the lower foam layer 42 has a thickness of 1. 4 mm to 2.6 mm.
The foam layer 4 of the floor sheet 1 is not limited to a two-layer structure, and may be a single layer or a multilayer structure of three or more layers.

The reinforcing layer 5 is a layer for enhancing the rigidity of the sheet main body 2 and imparting dimensional stability to the sheet main body 2. When the foamed layer 4 has a multilayer structure, the reinforcing layer 5 is usually provided in the middle of the foamed layer 4 as between the upper foamed layer 41 and the lower foamed layer 42. When the foam layer 4 is a single layer, the reinforcing layer 5 is provided on the lower surface of the foam layer 4.
The reinforcing layer 5 is not particularly limited as long as it contains fibers, and examples thereof include glass mats, glass nets, resin mats, resin nets, nonwoven fabrics or felts made of inorganic fibers or organic fibers, and woven fabrics. Can be mentioned. The fiber used for the reinforcing layer 5 is preferably one having high adhesiveness with the foamed layer 4, and examples thereof include glass fiber, vinylon fiber, polyester fiber, polyamide fiber, and polyimide fiber. In particular, glass fiber is preferred because of its excellent strength and small dimensional change. When using a glass ^fiber, a glass fiber woven or nonwoven fabric of 10g / ^{m 2} ~100g / m 2 is particularly preferred. For example, the same basis weight is preferable for woven or non-woven fabrics using other fibers such as polyester.
The thickness of the reinforcing layer 5 is usually about 0.1 mm to 0.4 mm.

The intermediate layer 6 is made of a non-foamed layer and is provided as necessary. The intermediate layer 6 has a function of maintaining the shape so that the shape of each uneven portion formed on the surface of the surface layer 3 is not crushed. The intermediate layer 6 is formed of a thermoplastic resin as exemplified in the column of the foam layer 4. As the main resin component of the mid layer 6, a vinyl chloride resin is preferable.
The thickness of the intermediate layer 6 is not particularly limited, but is preferably 0.05 mm to 0.30 mm.
When each layer of the sheet body 2 or any one of the layers includes a vinyl chloride resin as a main resin component, it is preferable to use the same vinyl chloride resin as the surface layer 3 described later as the vinyl chloride resin.

[Surface]
The surface layer 3 is a layer constituting the surface of the interior sheet.
The surface layer 3 includes a vinyl chloride resin as a main resin component, and further includes a masterbatch colorant, but does not substantially include calcium carbonate. It is preferable that the surface layer 3 has the softness | flexibility of the grade which can wind up an interior sheet in roll shape.
The colorant obtained as a master batch is obtained by kneading and dispersing a colorant such as a pigment or dye in a polymer (binder resin) such as a vinyl chloride resin. The colorant obtained as a master batch may contain a plasticizer in addition to the colorant and the polymer.
The surface layer 3 may contain various additives as needed. The surface layer 3 may contain other resin components (resins other than vinyl chloride resins) on the condition that the main resin component is a vinyl chloride resin. Moreover, the resin component of the surface layer 3 may consist only of a vinyl chloride resin.

  The vinyl chloride resin of the surface layer 3 includes vinyl chloride resin; partially crosslinked vinyl chloride; vinyl chloride-vinyl acetate copolymer, vinyl chloride-ethylene copolymer, vinyl chloride-propylene copolymer, vinyl chloride-styrene copolymer. Polymers, vinyl chloride-isobutylene copolymer, vinyl chloride-vinylidene chloride copolymer, vinyl chloride-butadiene copolymer, vinyl chloride-isoprene copolymer, vinyl chloride-chlorinated propylene copolymer, etc. Examples thereof include copolymers. These vinyl chloride resins may be used alone or in combination of two or more.

As the vinyl chloride resin, those produced by an emulsion polymerization method, a suspension polymerization method, a solution polymerization method, a bulk polymerization method, or the like can be used. A vinyl chloride resin obtained by an emulsion polymerization method or a suspension polymerization method is preferred because it is easy to process and handle.
The vinyl chloride resin obtained by the emulsion polymerization method is obtained by coating a surfactant on the surface of a fine powder having a basic particle diameter of several μm or less (preferably 1 to 3 μm) composed of a large number of fine particle aggregates. A paste is formed by blending an agent or the like. As the vinyl chloride resin obtained by the emulsion polymerization method, those having an average degree of polymerization of about 1000 to 2000 are preferably used. The vinyl chloride resin obtained by the suspension polymerization method is preferably a fine powder of 20 to 100 μm. The vinyl chloride resin obtained by the suspension polymerization method preferably has an average degree of polymerization of about 700 to 1500, and more preferably about 700 to 1000. The vinyl chloride resin preferably has a K value of about 60 to 95, and more preferably has a K value of about 65 to 80.
The partially cross-linked vinyl chloride may be obtained by adding a polyfunctional monomer to complete the polymerization when the vinyl chloride is subjected to suspension polymerization, microsuspension polymerization or emulsion polymerization. Examples of the polyfunctional monomer include diacrylate compounds such as polyethylene glycol diacrylate and bisphenol A-modified diacrylate.
The copolymer containing vinyl chloride, such as the vinyl chloride-vinyl acetate copolymer, may be in a block or random polymerization form. The average degree of polymerization of the copolymer is preferably about 700 to 1000, and more preferably about 700 to 800. Moreover, since the workability can be improved, the ratio of copolymerization components such as vinyl acetate (components other than vinyl chloride) is preferably about 5 to 12 mol%, and more preferably about 5 to 10 mol%.

It does not specifically limit as a polymer (binder resin) used for masterbatch formation, A conventionally well-known thing can be used. Examples of the polymer include vinyl chloride resins; polyolefin resins; vinyl acetate resins such as ethylene-vinyl acetate copolymers; acrylic resins such as ethylene-methacrylate resins; amide resins; polyester resins. Since it becomes easy to mix with the resin component of the surface layer 3, the polymer of the master batch is preferably the same type of polymer as the resin component of the surface layer 3. In particular, when the main resin component of the surface layer 3 is a vinyl chloride resin, the polymer of the master batch is preferably a vinyl chloride resin because it is well dispersed in the resin component of the surface layer 3. As the vinyl chloride resin of the master batch, the vinyl chloride resin described in the explanation column of the surface layer 3 can be appropriately selected and used.
Moreover, since the polymer used for masterbatch becomes easy to mix with the resin component of the surface layer 3, what has a high MFR value is suitable.

As the colorant to be masterbatched, conventionally known pigments or dyes of respective colors can be used.
Examples of the black colorant include carbon black, copper oxide, manganese dioxide, aniline black, activated carbon and the like. Examples of blue colorants include C.I. I. Pigment blue 15: 3, C.I. I. Pigment Blue 15, Bituminous Blue, Cobalt Blue, Alkaline Blue Lake, Victoria Blue Lake, Phthalocyanine Blue, Metal-free Phthalocyanine Blue, Partially Chlorinated Phthalocyanine Blue, Fast Sky Blue, Indanthrene Blue BC and the like. Examples of red colorants include red iron oxide, bengara, cadmium red, red lead, mercury sulfide, cadmium, permanent red 4R, resol red, pyrazolone red, watching red, calcium salt, lake red D, brilliant carmine 6B, eosin lake, Rhodamine Lake B, Alizarin Lake, Brilliant Carmine 3B, C.I. I. Pigment red 2 and the like. As yellow colorants, yellow lead, zinc yellow, cadmium yellow, yellow iron oxide, mineral first yellow, nickel titanium yellow, navel yellow, naphthol yellow S, Hansa Yellow G, Hansa Yellow 10G, Benzidine Yellow G, Benzidine Yellow GR, Quinoline Yellow Lake, Permanent Yellow NCG, Tartrazine Lake, C.I. I. Pigment yellow 12 and the like. Examples of green colorants include chrome green, chromium oxide, pigment green B, C.I. I. Pigment Green 7, Malachite Green Lake, Final Yellow Green G and the like. Examples of the orange colorant include red yellow lead, molybdenum orange, permanent orange GTR, pyrazolone orange, Vulcan orange, Indanthrene Brilliant Orange RK, Benzidine Orange G, Indanthren Brilliant Orange GK, C.I. I. And CI Pigment Orange 31. Examples of purple colorants include manganese purple, first violet B, and methyl violet lake. Examples of white colorants include zinc white, titanium oxide, antimony white, and zinc sulfide. Examples of extender pigments include barite powder, barium carbonate, silica, talc, and alumina white. These may be used alone or in combination of two or more. In particular, at least one pigment is preferably used as the colorant because it is difficult to change color even in a bathroom environment.
The colorant obtained as a master batch may contain various additives such as a plasticizer and a dispersant in addition to the polymer and the colorant as the binder resin.

The amount of the colorant in the masterbatch colorant can be appropriately set, but is preferably 40% by mass to 80% by mass, and more preferably 50% by mass to 70% by mass. If the amount of the colorant is too large, kneading with a polymer or the like may be difficult, and if the amount is too small, the whitening suppression effect may be reduced.
In addition, the amount of the polymer in the masterbatch colorant can be appropriately set, but is preferably 5% by mass to 30% by mass, and more preferably 5% by mass to 20% by mass. If the amount of the polymer is too large, the amount of the colorant is relatively small, and if the amount is too small, the colorant may not be dispersed substantially evenly.

The surface layer 3 may contain various additives on the condition that it does not substantially contain calcium carbonate.
The term "substantially free of calcium carbonate" means to allow the case where calcium carbonate is inadvertently or inevitably mixed during the production of the resin component or masterbatch, and is within the range that does not impair the effects of the invention. This includes cases where calcium is included. In this case, the content of calcium carbonate is 3% by mass or less, preferably 1% by mass or less, with respect to the entire surface layer 3.
As the additive, conventionally known additives can be used, for example, surfactants, fillers other than calcium carbonate, plasticizers, flame retardants, stabilizers, antioxidants, lubricants, foaming agents, antifungal agents, and the like. Can be mentioned.

In particular, the surface layer 3 may contain a surfactant as an additive, or may not contain substantially.
According to the inventor's research, when a surfactant is contained in a vinyl chloride sheet, the hydrophilic group in the surfactant reacts with water, and the hydrophilic group drops off, so that the surface of the sheet is removed. It has been found that fine irregularities are generated and the sheet surface appears white due to irregular reflection of light on the surface. In this respect, the interior sheet for bathroom of the present invention is excellent in whitening suppression and concealment effect as described later, so that even if the surface layer 3 contains a surfactant, the surface of the sheet hardly appears white.
The term “substantially free of surfactant” means that a case where the surfactant is mixed inadvertently or unavoidably during the production of the resin component or the masterbatch is permitted. The content of the surfactant when not substantially contained is 3% by mass or less, preferably 1% by mass or less, with respect to the entire surface layer 3.

The amount of the colorant that has been masterbatched is not particularly limited, but 100 parts by weight of vinyl chloride resin contained in the surface layer (this 100 parts by weight of vinyl chloride resin is the binder resin contained in the masterbatch colorant. 3 to 20 parts by mass is preferable, 5 to 18 parts by mass is more preferable, and 7 to 15 parts by mass is particularly preferable. When the amount of the master batch and the colorant is too large, relatively difficult their mixed kneaded with vinyl chloride resin becomes less, if its amount is too small, may decrease the effect of concealing the whitening is there.
Paying attention to the amount of the colorant in the masterbatch colorant, the amount of the colorant is 100 parts by weight of the vinyl chloride resin (100 parts by weight of the vinyl chloride resin is added to the masterbatch colorant. 1 part by mass to 16 parts by mass is preferable, and 1 part by mass to 8 parts by mass is more preferable. If the amount of the colorant in the masterbatch colorant is too large, the flexibility of the surface layer may decrease, and if the amount is too small, the colorability of the surface layer may decrease.

The bathroom interior sheet of the present invention is not easily whitened even when used for a long time. About the reason why the interior sheet of the present invention is not easily whitened, the present inventor has obtained the following conclusion.
When calcium carbonate is contained, it disappears due to elution of calcium carbonate on and around the sheet surface by sanitary products such as shampoos and rinses containing water and surfactants, and calcium carbonate is present. There may be a case where a fine cavity is generated at a location. The light is irregularly reflected on the surface where the fine cavities are generated, so that the sheet surface appears white. In this respect, since the interior sheet of the present invention does not substantially contain calcium carbonate, the fine cavities are hardly generated and can be prevented from appearing white.
In addition, a relatively soft soft synthetic resin may absorb water and cause whitening that appears white. This water absorption whitening is a phenomenon that appears white as a result of light being diffusely reflected by the presence of moisture between resin molecules. The vinyl chloride resin is a relatively soft resin, and even if the formation of fine cavities on the sheet surface is prevented by substantially not containing the calcium carbonate, the vinyl chloride resin absorbs moisture and whitens the water. May occur. In particular, it has been confirmed by experiments that vinyl chloride resins easily absorb moisture when immersed in hot water. In this respect, the interior sheet for bathroom of the present invention is mixed with the vinyl chloride resin in a state where the colorant is masterbatched, so that the dispersibility of the colorant is increased and the colorant is dispersed substantially evenly in the surface layer. To do. It has been confirmed that the whitening upon absorption of moisture can be concealed by dispersing the colorant substantially evenly.
It is assumed that the whitening on the surface of the interior sheet is suppressed by these synergistic effects.

The interior sheet of the present invention can be used as a bathroom floor sheet constructed on a bathroom floor, a bathroom wall sheet constructed on a bathroom wall, or a bathroom ceiling sheet constructed on a bathroom ceiling. .
In particular, the interior sheet of the present invention is preferably used as a floor sheet on which much water is applied.

  Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited to the following examples.

[Materials used]
(1) Suspension type vinyl chloride resin: Trade name “TEST1000Z” manufactured by Kaneka Corporation. The degree of polymerization is 1000.
(2) Cross-linked vinyl chloride resin: trade name “GR1300S” manufactured by Shin-Etsu Chemical Co., Ltd. Suspension type vinyl chloride resin partially crosslinked. K value 68.
(3) Vinyl chloride-vinyl acetate copolymer: Trade name “MB1008” manufactured by Kaneka Corporation. Vinyl acetate content: 10 mol%. K value 58.
(4) Calcium carbonate: trade name “E200” manufactured by Sankyo Flour Milling Co., Ltd.
(5) Plasticizer: Dioctyl phthalate.
(6) Other additives: stabilizer, antibacterial agent and antifungal agent.
(7) Surfactant: Nonionic surfactant.
(8) Mixed pigment (a) (pigment not masterbatched): Gray pigment prepared by mixing commercially available titanium oxide, carbon black and iron oxide. Titanium oxide: carbon black: iron oxide (mass ratio) = 8: 3: 3.
(9) Mixed pigment (b) (pigment not masterbatched): Gray pigment prepared by mixing commercially available titanium oxide, carbon black and iron oxide. This mixed pigment (b) was lighter gray than the mixed pigment (a). Titanium oxide: carbon black: iron oxide (mass ratio) = 8: 2: 3. (10) Masterbatch pigment (a): 10 parts by mass of the suspension type vinyl chloride resin of (1), 30 parts by mass of the plasticizer of (5), and 60 of the mixed pigment (a) of (8). A masterbatch-made gray pigment prepared by kneading 15 parts by weight of 1 part by weight of a dispersant and 150 parts by weight. This master batch pigment (a) was clayy at room temperature.
(11) Masterbatch pigment (b): 10 parts by mass of the suspension type vinyl chloride resin of (1), 30 parts by mass of the plasticizer of (5), and 60 of the mixed pigment (b) of (9). A masterbatch-made gray pigment prepared by kneading 15 parts by weight of 1 part by weight of a dispersant and 150 parts by weight. This master batch pigment was clayy at room temperature.

[Examples 1 and 2 and Comparative Examples 1 to 6]
The above materials used were blended in the proportions shown in Table 1 and mixed thoroughly, and then kneaded at 150 ° C. for 5 minutes in a biaxial roll machine to prepare a sheet having a thickness of 0.5 mm. In this way, a test surface layer of 0.5 mm was formed.
In the examples and comparative examples, since the purpose is to confirm the presence or absence of whitening of the surface of the surface layer, there is no need to provide a sheet body as shown in FIG. 2 below the surface layer, so the sheet body is omitted. . For this purpose, it is not necessary to form the surface of the surface layer in an uneven shape, so the surface of the surface layer was formed flat.

  In Table 1, the numerical value of each material used (composition) is expressed in parts by mass. Further, “phc”, which is the blending amount and the net amount of the pigment, is an abbreviation for “per hundred compound”, and represents the mass% of the pigment when the total composition (compound) excluding the pigment is 100 mass%. For example, in the case of Example 1, the blending amount of the pigment is the mass of the masterbatch pigment / (the total mass of the composition excluding the pigment−the mass of the masterbatch pigment) = 8.0 / (168.0−8.0). In the case of Comparative Example 4, the blending amount of the pigment is the mass of the pigment alone / (the total mass of the composition excluding the pigment−the mass of the pigment alone) = 4.5 / (154.5−4.5). Is required. The net amount of pigment in Examples 1 and 2 and Comparative Examples 1 and 2 represents phc for only the pigment contained in the masterbatch pigment, and the pigment in the masterbatch pigment is 60% by weight, so the net amount of pigment is It is 0.6 times the blending amount of the pigment.

[Machinability]
When preparing the test surface layer of each Example and Comparative Example, Examples 1 and 2 and Comparative Examples 1 and 2 using a master batch pigment were successfully kneaded with a biaxial roll machine. In Comparative Examples 3 to 6 used, pigments and the like adhered to the roll, and kneading was difficult.

[Surface test using rinse]
About 1 ml of commercially available rinse (trade name “Merit” manufactured by Kao Co., Ltd.) was dropped on the surface of the test surface layer of each Example and Comparative Example, and it was spread to about 10 cm 2.
Then, after standing for 24 hours at a temperature of 23 ° C. and a humidity of 50% RH, the rinse was wiped off, washed with water, and naturally dried until the surface was free of moisture.
Immediately after natural drying, the surface of the test surface layer was visually observed, and using a color difference meter (trade name “Color Meter ZE2000” manufactured by Nippon Denshoku Industries Co., Ltd.), L * a according to JIS Z8729 The color difference (ΔE) of the test surface layer before and after the test was measured by the * b * color system (L *: lightness, a * b *: chromaticity). Note that ΔE = {(L−L0) ² + (a−a0) ² + (b−b0) ² } ^1/2 .
Further, after 10 minutes from the natural drying, 30 minutes, 60 minutes, and 24 hours, the surface was visually observed in the same manner, and the color difference ( ΔE) was measured. The results are shown in Table 2. ΔE is an index indicating that the smaller the value, the less whitening occurs.

[Surface test using shampoo]
In place of rinsing, the surface of the test surface was visually checked and the same as [Surface test using rinsing], except that a commercially available shampoo (trade name “Merit” manufactured by Kao Corporation) was used. ΔE was measured. The results are shown in Table 3.

  In Tables 2 and 3, “◎” indicates that whitening was hardly confirmed by visual inspection, “◯” indicates that whitening was visually confirmed, and “Δ” indicates The whitening state was visually recognized visually, and “X” indicates that the whitening was markedly observed.

From Table 2, when rinsing was used, in Examples 1 and 2 and Comparative Examples 3 and 4, whitening was observed, but no whitening was observed after 30 minutes. As shown in Tables 2 and 3, Comparative Examples 1, 2, 5 and 6 containing calcium carbonate remained whitened even after 24 hours even when either rinse or shampoo was used.
Further, when Example 1 and Example 2 were compared, Example 2 that did not contain a surfactant had a smaller color difference (ΔE).

[Surface test using hot water]
The test surface layer of each example and comparative example was immersed in hot water kept at 40 ° C. for 3 days, then taken out, and the moisture on the front and back surfaces was wiped off with water absorbent paper. After wiping, the surface of the test surface layer was measured for color difference (ΔE) in the same manner as described above using a color difference meter (trade name “Color Meter ZE2000” manufactured by Nippon Denshoku Industries Co., Ltd.). Furthermore, after leaving for 10 minutes after wiping, after leaving for 30 minutes, and after leaving for 60 minutes, the color difference (ΔE) was measured using the color difference meter. The results are shown in Table 4.

From Table 4, it can be seen that when hot water is used, Examples 1 and 2 are less likely to be whitened compared to Comparative Examples 3 and 4 which differ only in that no masterbatch pigment is used.
In Examples 1 and 2, since the master batch pigment is used, the dispersion efficiency of the pigment is improved over the entire surface layer, and the vinyl chloride resin absorbs moisture and water intervenes between molecules. Even so, it is considered that whitening was suppressed.

[Examples 3 and 4 and Comparative Examples 7 and 8]
The materials used were blended in the proportions shown in Table 5, and a test surface layer of 0.5 mm was formed in the same manner as in Example 1.
For the test surface layers of Examples 3 and 4 and Comparative Examples 7 and 8, the color difference of the surface was measured according to the above [Surface test using hot water]. The results are shown in Table 6.

Comparing Examples 3 and 4 with Comparative Examples 7 and 8, even though the net amount of the pigment is the same, Examples 3 and 4 using the masterbatch pigment have a low initial whitening degree. It can be seen that whitening decreases over time.
Thus, the bathroom floor sheet of the present invention is suitable as a bathroom floor material because it can simultaneously suppress whitening derived from sanitary products such as shampoo and rinse and whitening derived from moisture such as hot water.

  The bathroom interior sheet of the present invention can be used as a covering material for floors, wall surfaces, or ceilings of various bathrooms such as general houses, bathhouse facilities such as public baths and hotels, and nursing care facilities.

1 Floor sheet for bathroom (interior sheet for bathroom)
2 Sheet body 3 Surface layer 4 Foam layer 5 Reinforcement layer 6 Intermediate layer

Claims (2)

A sheet body, and a surface layer provided on a surface of the sheet body,
The interior sheet for bathrooms, wherein the surface layer includes a masterbatch colorant including a vinyl chloride resin and a colorant as a polymer, and a vinyl chloride resin , and substantially does not include calcium carbonate.   The bathroom interior sheet according to claim 1, wherein the masterbatch colorant is contained in an amount of 3 to 20 parts by mass with respect to 100 parts by mass of the vinyl chloride resin.

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