JP3008181B2 - Surface material for water absorbing material and body fluid absorbing material using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a body fluid absorbing material having an excellent dry feeling and a good skin feel. Further, the present invention is a surface material for a water-absorbing material, which is used on a body fluid contacting surface or a wearing surface of the body fluid absorbing material to reduce a wet feeling when the body fluid absorbing material is wet and to provide a more advanced dry feeling. Surface materials useful for

[0002]

2. Description of the Related Art Conventionally, bodily fluid absorbing materials have been used to absorb vaginal discharge, menstrual blood, sweat, urine, and other bodily fluids.

As a bodily fluid absorbing material, there is a material composed of a non-woven fabric having a liquid absorbing property. However, these materials have an excellent liquid absorbing property, but have a problem that they give an unpleasant wet feeling to a wearing place. In order to solve this problem, a film formed of a water-repellent nonwoven fabric, a water-repellent nonwoven fabric subjected to a water-repellent treatment or a film having a large number of pores has been developed to solve this problem. The thing used on the wearing surface side etc. are known.

[0004] However, as compared with those made of a non-woven fabric, the water absorbing liquid is less likely to return and wet, but has poor surface hygroscopicity, giving an unpleasant stuffiness and, at the same time, giving a feeling of being unpleasant. Gives a feeling of stickiness and sticking peculiar to water-repellent treated surface materials and films. Further, the fact is that an absorbent obtained by subjecting a nonwoven fabric to a water-repellent treatment has a problem that the water absorption is inevitably reduced.

[0005]

DISCLOSURE OF THE INVENTION The present invention is excellent in water absorbing property, water absorbing property and moisture absorbing property, so that the wet, wet and sticky feeling when wet is reduced and the dryness is further improved. An object of the present invention is to provide a surface material for a material, and a body fluid absorbing material having the surface material on a body fluid contact surface or a wearing surface.

[0006]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and found that a hydrophilic powder is adhered to the surface of a nonwoven fabric having a water-repellent surface. Thus, it has been found that it is possible to improve a decrease in water absorption due to the water repellent treatment and to improve the water absorption while keeping the reversion of the liquid once absorbed low.
The inventors have conducted further research on this discovery, and have found that the body fluid absorbing material to which the surface material is applied is rich in hygroscopicity due to the hydrophilic powder, and has a reduced degree of adhesion to a wearing part and a powder. The unique smooth feeling reduces the stuffiness when wet, further enhances the dry feeling, and finds that the skin feels excellent without any irritation to the skin, and the surface material is useful as a material for applying a body fluid absorbing material. After confirming this, the present invention was developed.

That is, the present invention is a surface material for a water-absorbing material having any of the following aspects.

(1) A surface material for a water-absorbing material, wherein a hydrophilic powder is attached to a water-repellent surface of a fiber structure having at least one surface subjected to a water-repellent treatment.

(2) In the above surface material, the hydrophilic powder is selected from silk powder, cellulose powder, silica powder, insoluble starch powder, talc, mica, kaolin, titanium dioxide, sericite, calcium carbonate, magnesium carbonate, and silicic anhydride. And at least one member selected from the group consisting of hemp powder and hemp powder.

[0010] The present invention is a body fluid absorbing material having any one of the following aspects.

(3) A body fluid absorbing material comprising the surface material for a water absorbing material according to the above (1) or (2) on a body fluid contact surface side.

(4) The bodily fluid-absorbing material according to (3), which has a structure in which the water-absorbing material and the surface material for water-absorbing material according to (1) or (2) are laminated.

(5) The above (3) having a laminated structure formed of at least the surface material for a water absorbing material of any of the above (1) or (2), a water absorbing material and a liquid impermeable layer through which a liquid does not strike through. Or
The body fluid absorbing material according to (4).

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The fibrous structure used in the present invention is not particularly limited, but may be a woven fabric, a knitted fabric, a non-woven fabric (including a non-woven fabric composed of non-converged filaments or short fibers) or paper. Or a pulp product or the like.

The fibers constituting such a fiber structure are not particularly limited, and any fibers can be used. Specifically, for example, polyester fibers, polyamide fibers, acrylic fibers, polypropylene, polyethylene /
Synthetic fibers such as polyester composite fiber and polyethylene / polypropylene composite fiber; natural fibers such as cotton, wool, and hemp;
Or semi-synthetic fiber such as rayon fiber and acetate fiber,
And mixed fiber products of various fibers and mixed fiber products.
Preferably, polypropylene, polyethylene, polyester, polyethylene terephthalate, synthetic fibers such as ethylene vinyl acetate or composite fibers thereof are exemplified,
Specific examples include polyethylene / polyester (including polyethylene terephthalate) composite fibers, polyethylene / polypropylene composite fibers, and ethylene vinyl acetate / polypropylene composite fibers.

Incidentally, these synthetic fibers are not particularly limited by the cross-sectional structure and the like, and may be modified cross-sectional fibers, porous fibers,
It may have various structures as represented by porous water-absorbing fibers and the like.

The fibrous structure used in the present invention may be a single-layer sheet or film composed of the above-mentioned various components, or a multi-layered sheet or film composed of any different components. .

The shape is not particularly limited as long as it is in the form of a sheet or a film. For example, the shape may be a mesh, a raised pattern (embossed pattern), or the like.

The fibrous structure of the present invention is characterized in that at least one surface side of the film-like or sheet-like fibrous structure is subjected to a water-repellent treatment.

The water-repellent treatment may be applied to at least one surface of the fibrous structure, but the water-repellent treatment may be applied to the entire surface and / or the entire area inside. The water-repellent treatment is a method of preparing a fiber structure and then performing a water-repellent treatment on at least one of the structures, or a method of preparing a fiber or a sheet-like or film-shaped fiber by previously performing a water-repellent treatment on the fiber. Either may be adopted. Preferably the latter.

The water-repellent treatment is not particularly limited, and a general method can be widely used. Specifically, a method using a water-repellent treatment agent such as silicone oil, fluororesin, methyl hydrogen polysiloxane or an oil agent containing these components is exemplified. Silicon oil, fluoro resin, methyl hydrogen This is a method of processing fibers using a water repellent agent containing polysiloxane or the like.

The surface material for a water-absorbing material of the present invention is characterized in that a hydrophilic powder is further adhered to the water-repellent surface of the water-repellent fiber structure.

The term "hydrophilic powder" as used herein broadly means a substance in which the powder component is composed of molecules having a hydrophilic functional group such as a hydroxyl group, an amino group, a carboxyl group, etc. and has a hygroscopic property or a water absorbing property. Specifically, silk, cellulose, silica, insoluble starch, talc, mica, kaolin, titanium dioxide, sericite, calcium carbonate,
Examples thereof include powdery powders composed of magnesium carbonate, silicic anhydride, hemp, or the like. These may be used as a single type of powder, or two or more types may be used in any combination.

Suitable hydrophilic powders include silk powder, silica, insoluble starch powder, and those having the same or similar properties in moisture absorption and water absorption as silk powder, and more preferably silk powder. .

The silk powder may be used in combination with at least one other hydrophilic powder. Suitable combinations include, for example, a combination of silk powder and silica powder, a combination of silk powder and insoluble starch powder, or a combination of silk powder, silica powder and insoluble starch powder. In addition, each mixing ratio of these hydrophilic powders is not particularly limited, and an arbitrary ratio can be adopted.

In the present invention, the term "insoluble starch powder" refers to a powder which is insoluble in water or a solvent and has water absorption.
Specific examples include corn starch, rice starch, potato starch, and distarch phosphate obtained by cross-linking starch and phosphoric acid.

The silk powder is composed of particulate or powdered fibroin, and examples thereof include particulate and powdered silk fibroin alone and / or modified fibroin obtained by graft-polymerizing various polymers. Preferably, it is a silk powder consisting of silk fibroin alone.

[0028] Particulate / powder silk fibroin is prepared by physically grinding silk fibers without any chemical treatment. More specifically, for example,
As described in, for example, JP-A No. 1941 and JP-B-53-38449, a refined silk raw material is dissolved in an appropriate solvent and desalted if necessary. A method of coagulating / precipitating silk fibroin by adding an organic solvent, blowing air or stirring, etc., and crushing after drying, etc., and a method of pulverizing silk fibroin by dry mechanical pulverization means, etc. Prepared by

Although silk fibroin is not particularly limited by its structure, it is preferable that most of the silk fibroin is composed of water-insoluble fibroin (β structure).

As the modified fibroin, a polymer comprising 3 to 40% by weight of the above fibroin, 50 to 95% by weight of an acrylic acid monomer and 0 to 20% by weight of an olefinically unsaturated monomer is mainly used. And the like.

The powder used in the present invention is not limited by its shape and particle size as long as it is in the form of particles or powder, but preferably has an average particle size of 50 μm.
m or less, preferably 20 μm or less, more preferably 3 to
It is 15 μm, more preferably 3 to 10 μm.
By employing a hydrophilic powder having such a particle size, the adhesion of the powder to the water-repellent treated surface of the fibrous structure is improved, and a surface material having an excellent touch feeling can be obtained.

The hydrophilic powder only needs to adhere to at least the water-repellent surface of the fibrous structure. Therefore, the method of applying the powder is not particularly limited as long as the object can be achieved. Various methods such as a method, an impregnation method, a spray method, a pad method, and a coating method are widely adopted.

More specifically, as an example of a method for attaching silk powder as a hydrophilic powder to a water-repellent treated surface of a fibrous structure, the fibrous structure is dipped, sprayed, putted or coated with a silk fibroin solution. After treatment by any of the methods described above, drain if necessary,
Then, a method of drying is used.

The silk fibroin solution used in the method is not particularly limited, and a known silk fibroin solution can be used. In addition, silk fibroin includes cocoons,
Silk fibers obtained by scouring silk materials such as raw silk, penny, bouret or silk waste fiber by-produced in the raw silk or silk spinning process to remove sericin and other impurities.
The scouring is not particularly limited as long as sericin and other impurities can be substantially removed, and a normal scouring method using soap, soda ash, or the like is employed. How to

The silk fibroin solution may be prepared by adding such a silk fibroin to a copper-ethylenediamine aqueous solution, a copper hydroxide-ammonia aqueous solution (Schweizer reagent), a copper hydroxide-alkali-glycerin aqueous solution (Roehre reagent), a lithium bromide aqueous solution, calcium or magnesium. Alternatively, it can be prepared by dissolving in a solvent such as an aqueous solution of zinc hydrochloride, nitrate or thiocyanate, or an aqueous solution of sodium thiocyanate, and removing these solvents by dialysis or the like. The solvent for dissolving the silk fibroin preferably includes an aqueous solution of calcium chloride or lithium bromide.

Preferably, silk which has been sufficiently refined so as not to contain sericin or other contaminants is dissolved in a concentrated aqueous solution of lithium bromide (specific gravity of 1.45 or more) at a temperature of 60 ° C. or less, and then desalted by dialysis or the like. A method of coating the water-repellent treated surface of the fibrous structure with the obtained silk fibroin aqueous dispersion and then drying the coated fiber is employed.

The concentration of the silk fibroin in the silk fibroin solution is not particularly limited and is appropriately selected depending on the kind of the solvent and the like, but is usually 0.1 to 5%, preferably 0.2 to 3%. %, More preferably in the range of 0.3 to 1%.

Further, a liquid such as alcohols such as methyl alcohol and ethyl alcohol, glycols such as polyethylene glycol, and aldehydes such as acetaldehyde is applied to the fibrous structure to which the silk fibroin solution has been attached by the above method. Can also. By such a treatment, silk fibroin adhering to the fiber structure is changed from a water-soluble structure to a water-insoluble structure (β-form structure), and the adhering force of the powder on the fiber surface is increased, thereby giving an effect of preventing powder falling. It becomes possible.

As a method for attaching the hydrophilic powder to the water-repellent surface of the fibrous structure, a method using a binder may be used.

More specifically, using a composition prepared by stirring and dispersing a hydrophilic powder and a binder in water or a suitable solvent, spraying, putting or coating the water-repellent surface of the fibrous structure. This is a method of treating by any method such as immersion, removing the liquid as needed, and then drying.

The binder used in the method is not particularly limited, and specific examples thereof include an emulsion type such as a silicone resin, a polyurethane resin, a polyacrylic resin and a fluororesin, or a mixed emulsion type of these resins. Examples thereof include those that do not impair water absorbency and hygroscopicity, and more preferably those that have water absorbency or hygroscopicity.

The binder which does not inhibit water absorption and hygroscopicity is not particularly limited as long as it does not inhibit water absorption and hygroscopicity. Specifically, hydroxypropyl cellulose (HPC), methyl cellulose (MC),
Examples include polyvinyl alcohol.

According to this method, since the hydrophilic powder such as silk powder is fixed to the water-repellent surface of the fiber structure, it is possible to prevent the powder from falling off due to contact or friction, and to maintain the hydrophilic property even when wet. It is possible to realize the smoothness and smoothness unique to powder. Further, by employing a binder having water absorbency and hygroscopicity, it becomes possible to further improve the water absorbency and hygroscopicity of the surface material to which the powder is attached, and furthermore, the bodily fluid absorbent containing the surface material.

The drying method is not particularly limited in any of the above methods, but it is preferable to further perform a heat treatment after the drying treatment. Thereby, the water insolubilization of the hydrophilic powder can be further promoted. The heat treatment may be either dry heat treatment or wet heat treatment,
C., preferably 80 to 120.degree. C., using heated air or steam.

The hydrophilic powder adhering amount of the water-absorbent surface material of the present invention is 0.05 g for a nonwoven fabric of 16 g / m ^2.
To 10 g / m ² range, are preferably selected appropriately from 0.1 to 1 g / m ² range.

In the prior art, it is not easy to ensure both contradictory properties such as water absorption and dry feeling to a satisfactory degree, and it is necessary to reduce the water absorption by a surface water repellent treatment for imparting a dry feeling. Although not obtained, in the present invention, the combination of the water-repellent treatment and the hydrophilic powder treatment reduces the water-repellent treatment while maintaining the reduction of the water-absorbing liquid (wet back) obtained by the water-repellent treatment. The improved water absorption can be improved and improved. Therefore, according to the present invention, it is possible to provide a surface material exhibiting excellent dry feeling while ensuring water absorption. Further, since the presence of powder particles on the wearing surface reduces the feeling of adhesion to the surface material when worn, it reduces stickiness, sliminess, and discomfort caused by cold and warm feeling during infiltration, and hydrophilic powder. The smoothness can be imparted without stuffiness due to the hygroscopicity.

Therefore, the surface material of the present invention can be used not only as a general surface material for water-absorbing materials, but also as a diaper, a vagina sheet, a napkin, and a sweat-repellent material, which may cause problems of wetness and wetness when wet. It is useful as a wearing surface material for body fluid absorbing materials such as pats, plasters, bed sheets and incontinence pats.

Accordingly, the present invention further provides a bodily fluid absorbing material characterized in that the surface material for a water-absorbing material of the present invention is provided on a bodily fluid contact surface, in other words, on a body part wearing surface side.

[0049] Body fluid absorbing materials include vaginal discharge, menstrual blood,
There is no particular limitation as long as it absorbs blood, sweat, and urine, and specific examples include the above-mentioned diapers, vaginal discharge sheets, napkins, sweat-absorbing pads, adhesive plasters, bedwetting sheets, incontinence pads, and the like.

The bodily fluid absorbing material of the present invention may be any material as long as the surface to be worn on the body is composed of the above-mentioned surface material, and the other parts may adopt a conventionally known structure.

Preferably, the bodily fluid absorbent of the present invention comprises
As shown in the example, the structure has a structure in which at least the surface material for a water absorbing material (4) and the water absorbing material (5) are laminated. Other structures are not particularly limited as long as they have a structure relating to the body fluid absorbing material on the body wearing surface side (body fluid contact surface side) (6).

More preferably, as shown in FIG. 2, at least the surface material for a water absorbing material (4) and the water absorbing material (5) of the present invention.
And a laminate structure formed of a liquid-impermeable layer (7) through which liquid does not strike through. The body fluid absorbing material of the present invention may further contain other components between the layers or on the lower surface (8) of the liquid-impermeable layer in such a laminated structure (FIG. 2). The adhesive layer may be provided on the lower surface of the adhesive layer (in other words, the surface to be adhered to underwear or the like) (8), and may further include a release paper. As shown in FIG. 3, the surface material for a water-absorbing material (4), the water-absorbing material (5), the water-absorbing material (5), the fibrous structure (2) having at least one surface subjected to a water-repellent treatment, and a liquid, as shown in FIG. May have a laminated structure formed from a liquid-impermeable layer (7) that does not strike through.

The liquid-impervious layer through which the liquid does not strike through is not particularly limited as long as it is in the form of a sheet, preferably a film, having a certain barrier property against at least water. It is preferable to have.
The material of the liquid-impervious layer is not particularly limited as long as it has the above properties, and those commonly used are widely used. As an example, polyolefin such as polyethylene and polypropylene, polyester, nylon, polyvinyl alcohol, polystyrene, polyvinylidene chloride and the like, or a multilayer film thereof are exemplified.

Although the thickness of the film is not particularly limited, it is usually 0.1 to 500 μm, preferably 0.1 to 100 μm.
Are appropriately selected from the range described above.

The water-absorbing material is not particularly limited as long as it has water-absorbing properties. For example, any of conventionally known water-absorbing materials such as water-absorbing pulp and water-absorbing polymer can be used.

As one embodiment of the body fluid absorbing material of the present invention, a water absorbing material is accommodated between the surface material of the present invention on the wearing surface side and the liquid impermeable film on the back surface, and the outer periphery is further heat-sealed. In addition to the formed bodily fluid absorbing material, the bodily fluid absorbing material shown in Examples is exemplified, but is not limited thereto.

[0057]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the examples.

Example 1 A composite fiber (50:50) of polyethylene and polyethylene terephthalate was subjected to a water-repellent treatment using a water-repellent oil agent containing silicon, and a 16 g / m ² nonwoven fabric sheet was prepared using the water-repellent fiber. Thus, a water repellent surface material was obtained.

An aqueous solution obtained by dispersing silk powder and silica was sprayed onto one surface of the above-mentioned surface material, followed by deliquoring and drying to obtain silk powder (1 g / m 2).
² ) attached.

A water-absorbing material (50 g) made of a nonwoven fabric of cellulose fibers was provided on the non-powder side of the obtained water-repellent surface material.
/ M ² , thickness 0.6 to 0.8 mm) (5), and the laminate is passed through the wearing surface (6) from the back surface (9) so that the powder adhesion surface side is the front surface side. Again the back side (9)
The body fluid absorbing material of the present invention is wrapped so as to enclose the water absorbing material (5), the both ends are overlapped, and a waterproof synthetic resin sheet (7) is bonded to the back surface (9). It was prepared (FIG. 4).

Example 2 A silk powder-attached water-repellent surface material was prepared in the same manner as in Example 1 except that an aqueous solution obtained by dispersing the powder using silk powder as a hydrophilic powder was coated on the water-repellent surface material. did. Further, in the same manner as in Example 1, the water-absorbing material (50 g / m ² , thickness 0.6 to 0.8 m
m) were laminated to obtain a laminate.

By subjecting the laminate to a known embossing process of heating and pressing at 100 ° C. or higher, both nonwoven fabrics were laminated and a laminate having a plurality of irregularities was formed. At this time, by embossing, a plurality of through holes are formed in the concave portion at the same time as the concave and convex portions. Therefore, both nonwoven fabrics are adhered on the entire surface and are further adhered in the concave portion. The diameter of the recess was set to about 0.7 mm, and the diameter of the through hole formed in the recess was set to about 0.4 to 0.5 mm.

Using the laminated body, it was wound so as to enclose a water-absorbing material in the same manner as in Example 1, the both ends were overlapped, and a waterproof polyethylene film was adhered to the back side of the laminate. A body fluid absorbing material was prepared.

FIG. 5 is an enlarged sectional view of a main part of the body fluid absorbing material.

COMPARATIVE EXAMPLE 1 Except that hydrophilic powder treatment was not performed, a body fluid absorbing material in which hydrophilic powder was not attached to the wearing portion of the water-repellent surface material was prepared in the same manner as in Example 1. Prepared.

COMPARATIVE EXAMPLE 2 Instead of the water-repellent surface material described in Example 1, a composite fiber of polyethylene and polyethylene terephthalate (50: 5
0) was subjected to hydrophilic treatment using a hydrophilic oil agent, and a hydrophilic surface was prepared in the same manner as in Example 1 except that a nonwoven fabric composed of the hydrophilic fibers was used and hydrophilic powder treatment was not performed. A bodily fluid absorbing material in which the hydrophilic powder did not adhere to the wearing portion of the material was prepared.

Comparative Example 3 As shown in FIG. 6, a waterproof synthetic resin sheet (7)
A bodily fluid absorbent having a structure in which a hydrophilic nonwoven fabric (13), an absorbent (× 2) (5), and a water-repellent surface material (2) were laminated was prepared. Here, the same waterproof synthetic resin sheet (7) and absorbent material (5) as in Example 1 were used.
The same water-repellent surface material (2) as in Example 1 was used, except that the surface was not treated with hydrophilic powder.

The hydrophilic nonwoven fabric is prepared by subjecting a fiber composed of a composite fiber of polyethylene and polyethylene terephthalate (50:50) and polypropylene to a hydrophilic treatment using a hydrophilic oil agent and using the fiber to prepare a nonwoven fabric. did.

Experimental Example 1 Various body fluid absorbing materials (hereinafter, referred to as samples) prepared in Examples 1 and 2 and Comparative Examples 1 to 3 were (1).
A liquid absorption rate test, (2) a reversion test, and (3) a sensory test (dry feeling, smoothness) were performed.

(1) Measuring method of liquid absorption speed: (i) Dissolve blue dye in water and add 20 ml to burette
Put in. (ii) The sample is sandwiched between the holders for measuring the liquid absorption speed, and the tip of the burette is brought to the point of the sample. (iii) At the same time as opening the burette cock, press the stopwatch to measure and drop 1 ml. (iv) Read the time when the liquid has completely soaked into the sample.

(2) Method of measuring the degree of reversion: (i) Dissolve the blue dye in water.
(ii) Measure and record the weight of one 8 × 17 cm filter paper. (iii) Bring the tip of the hole pipette to just above the wearing part of the sample, drop 1 ml of the water created in (i), and simultaneously press the stopwatch to measure the time. (iv) Leave for exactly 1 minute, put the filter paper measured in (ii), put a 2.5 kg iron plate on it, and leave for exactly 1 minute.

(V) The weight of the filter paper is measured again, and the difference in weight is defined as the amount of return.

(3) Evaluation method of sensory test (dry feeling / smoothness): After absorbing 1 ml of physiological saline into each sample, 30 randomly selected women were asked to sample surface (body fluid absorbing surface, wearing surface) ) Was evaluated based on the following criteria.

<Dry feeling> a: Dry feeling, smooth feeling b: Dry feeling, smooth feeling, somewhat c: Neither d: Dry feeling, not much smooth feeling e: Dry feeling, smooth feeling No feeling <Smoothness, good sliding> a: Smooth and good sliding b: Somewhat smooth and good sliding c: Neither d: Not very smooth, not good sliding e: Not smooth, not good sliding

A circle was given to the most suitable items from a to e, and the percentage of the number of persons who selected a or b was calculated and evaluated. Table 1 shows the results.

[0076]

[Table 1]

From these results, although the bodily fluid absorbing material of the present invention (Examples 1 and 2) has a slightly lower liquid absorption rate than Comparative Examples 2 and 3, the liquid once absorbed has less reversion, and It turned out that it was excellent in retention. The fact that the once absorbed liquid has a small amount of reversion indicates that the liquid has little wetness and is excellent in dryness when wet, and this point was also remarkably proved in the sensory test. Moreover, it was shown that the bodily fluid absorbent of the present invention was excellent also in surface smoothness.

EXPERIMENTAL EXAMPLE 2 The following experiment was conducted using the body fluid absorbing material of the present invention prepared in Example 2.

(1) Hygroscopicity After leaving in a thermo-hygrostat at 20 ° C. and 5% to reach a constant weight,
It is left in a constant temperature and humidity room at 40 ° C. and 75% for 7 hours, and the weight difference between before and after is measured, and the difference is defined as the moisture absorption.

As a comparative product, instead of the surface material used in Example 2, a mesh made of a mixed product of polyethylene / polyethylene terephthalate composite fiber (50:50) and polyethylene (fiber composition: 80:20) A body fluid absorbing material having a nonwoven fabric (non-powder treatment) as a surface material was used.

The moisture absorption of the comparative product was 1.87%, while the moisture absorption of the product of the present invention was 2.15%, which was about 15% higher than that of the comparative product.

(2) Adhesion to skin The force (adhesion) that adheres to the skin when the body fluid absorbing material absorbs moisture was measured by the following test method.

<Test Method> Approximately 1 ml of sample was sprayed
After pressing the sensor with a constant load using a compression tester, immediately measure the sticking force corresponding to the sensor when releasing the load. The higher the adhesion, the stronger the degree of sticking to the skin and the more discomfort.

The comparative products 1 and 2 used in the above (2) were used as comparative products. FIG. 7 shows the results.

(3) Contact cold temperature sensitivity The cold sensation caused by direct contact between the sample surface and the skin was measured by the following method.

<Measurement Method> A hot plate heated to a constant temperature was mixed with 1 ml
The sample on which the purified water is absorbed is placed on the wearing surface, and the manner in which heat is transferred from the iron plate to the cloth is measured as a Qmax value (maximum initial heat flow rate). The larger the Qmax value, the colder
Smaller is warmer.

As Comparative Products, Comparative Product 1 and Comparative Product 2 used in (2) above were used. FIG. 8 shows the results. As is clear from the results, it was found that the Qmax value of the product of the present invention (Example 2) was small and the feeling of coldness when wet was small. Since the three products of the present invention and the comparative product are the same fiber material, the product of the present invention has a small moisture content remaining on the surface.
It is also considered that the adhesion is low.

The fact that the product according to the present invention has a low contact cold / hot sensation indicates that there is little discomfort due to wetness and coldness when wet.

[Brief description of the drawings]

FIG. 1 is a view showing a laminated structure of a surface material for a water-absorbing material and a water-absorbing material of a body fluid absorbing material of the present invention.

FIG. 2 is a view showing a laminated structure formed of a surface material for a water-absorbing material, a water-absorbing material, and a liquid-impermeable layer that does not strike through a liquid, which the body fluid absorbing material of the present invention has.

FIG. 3 is a diagram showing a laminated structure formed of a surface material for a water-absorbing material, a water-absorbing material (× 2), a water-repellent treated fibrous structure, and a liquid-impermeable layer that does not strike through the liquid, which the body fluid absorbing material of the present invention has. FIG.

FIG. 4 is a partial cross-sectional perspective view of the body fluid absorbing material of the present invention prepared in Example 1.

FIG. 5 is a view showing a main part of a cross section of the body fluid absorbing material of the present invention prepared in Example 2.

FIG. 6 is a view showing a laminated structure of a comparative body fluid absorbent material prepared in Comparative Example 3.

FIG. 7 shows the measurement of the adhesion of the body fluid absorbing material of the present invention to the skin when wet and the adhesion of the comparative product to the skin when wet, using a compression tester.
It is a figure showing the result of comparison (Experimental example 2).

FIG. 8 is a diagram showing the results of comparing the contact cooling and warming sensation when wet between the body fluid absorbing material of the present invention and a comparative product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydrophilic powder 2 Surface material for water-repellent water-absorbing material 3 Water-repellent treated surface 4 Surface material for hydrophilic powder-attached water-absorbing material 5 Water-absorbing material 6 Body fluid contact surface, wearing surface 7 Impermeable layer through which liquid does not pass through 8 Impermeable Lower surface 9 of backing layer 9 Back side 10 Convex part 11 Concave part 12 Through hole 13

Claims (5)

(57) [Claims] 1. A surface material for a water-absorbing material, wherein a hydrophilic powder is attached to the water-repellent surface of a fibrous structure having at least one surface subjected to a water-repellent treatment. 2. The hydrophilic powder is a group consisting of silk powder, cellulose powder, silica powder, insoluble starch powder, talc, mica, kaolin, titanium dioxide, sericite, calcium carbonate, magnesium carbonate, silicic anhydride and hemp powder. The surface material for a water absorbing material according to claim 1, wherein the surface material is at least one selected from the group consisting of: 3. A body fluid absorbing material comprising the surface material for a water absorbing material according to claim 1 or 2 on a body fluid contact surface side with a water-repellent treated surface as a surface. 4. A body fluid absorbing material according to claim 3, further comprising a structure in which a water absorbing material and the surface material for a water absorbing material according to claim 1 or 2 are laminated. 5. The body fluid absorption according to claim 3 or 4, wherein the body fluid absorption has a laminated structure formed of at least the surface material for a water absorbing material according to claim 1 or 2, and a liquid impermeable layer through which a liquid does not pass through. Wood.